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EP3370571B1 - Method for mechanically sharpening bristles and grinding device - Google Patents

Method for mechanically sharpening bristles and grinding device Download PDF

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Publication number
EP3370571B1
EP3370571B1 EP16785450.4A EP16785450A EP3370571B1 EP 3370571 B1 EP3370571 B1 EP 3370571B1 EP 16785450 A EP16785450 A EP 16785450A EP 3370571 B1 EP3370571 B1 EP 3370571B1
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EP
European Patent Office
Prior art keywords
tuft
grinding
bristle
holder
axis
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Application number
EP16785450.4A
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German (de)
French (fr)
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EP3370571A1 (en
Inventor
Bart Gerard Boucherie
Henk Vandenbussche
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GB Boucherie NV
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GB Boucherie NV
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Publication of EP3370571A1 publication Critical patent/EP3370571A1/en
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Classifications

    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/04—Preparing bristles
    • A46D1/05—Splitting; Pointing
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/02—Bristles details
    • A46D1/0276—Bristles having pointed ends
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46D—MANUFACTURE OF BRUSHES
    • A46D1/00—Bristles; Selection of materials for bristles
    • A46D1/04—Preparing bristles
    • A46D1/055—Combing; Mixing; Sorting
    • A—HUMAN NECESSITIES
    • A46—BRUSHWARE
    • A46B—BRUSHES
    • A46B2200/00—Brushes characterized by their functions, uses or applications
    • A46B2200/10—For human or animal care
    • A46B2200/1066—Toothbrush for cleaning the teeth or dentures

Definitions

  • the invention relates to a method for mechanically sharpening bristles and a grinding device for mechanically sharpening bristles.
  • Pointed bristles are used in various brushes, in particular toothbrushes, since these have an advantageous effect on the cleaning properties of the brush.
  • a chemical method for sharpening bristles is known, with which the quality of the bristle tips can be improved.
  • the bristle ends are immersed in a strongly basic or acidic solution and pulled out of the solution over a period of about 30 minutes. At the point where the bristles are in contact with the solution, the surface of the bristles dissolves and thus leads to a gradually decreasing diameter and thus to the bristle ends.
  • the disadvantage of the chemical process is the environmentally harmful properties of the solution used. Not only are the employees and the environment endangered by the solution, but also the operating resources, for example due to corrosion, are damaged. This leads to a shorter service life of the machines and tools and is therefore disadvantageous from an economic point of view.
  • the BE 1 013 968 A3 also shows a device by means of which bristles, which are fastened in a brush head, can be provided with a contour.
  • the object of the invention is to provide a method and a device for sharpening bristles which ensures a high quality of the bristle tips without resorting to environmentally harmful chemical solvents.
  • one or more grinding rollers are used for grinding, which preferably have a circular cylindrical or conical outer surface on which the grinding process is carried out. Furthermore, the tuft holder rotates during grinding about an axis of rotation which is parallel to the longitudinal direction of the clamped bristles and at an angle of at least 80 ° to the axis of rotation of the grinding roller. This relative movement favors the sharpening of the bristle ends.
  • the ratio (R / r) of the radius of the grinding roller to the distance of the clamped bristle tuft furthest from the axis of rotation of the tuft holder from the axis of rotation is 1 to 4, in particular 1 to 3. This ratio has an advantageous effect on the quality of the bristle tips.
  • the present invention gives a completely different specification from the prior art as to how far the bristle tuft should protrude from the holder if the bristles have a tip of a predetermined length should have over which they taper. If, for example, the bristle tuft is ground so that the individual bristles have or should have a tipped length of 4 mm, the bristle tuft is clamped in the tuft holder in such a way that the freely projecting length of the bristle tuft is at least 12 mm at the start of the grinding process.
  • the holder is to be understood as the point of the tuft holder that is closest to the just ground end of the bristle tuft but has contact with the bristle tuft.
  • the tufts of bristles were always clamped in such a way that their free length was significantly below this ratio.
  • the free length of the clamped tufts of bristles to be ground was preferably less than half of the total length.
  • the relatively short, free length was considered advantageous because it was believed to improve the positional stability of the bristles and the predictability of the grinding process, which was considered advantageous.
  • the invention ensures that the tufts are sharpened at a more acute angle and much more precisely because of the extreme elasticity of the bristle tufts protruding long.
  • the bristles have a tapered tip.
  • This method is also suitable for brushes with bristles fastened without anchors, in which the bristles which have been pointed on one side are fastened, in particular glued or welded, with their non-sharpened end in the brush head, and are also used for bristle tufts which are fastened via an anchor or a wire loop.
  • the curved surface of the grinding rollers has an advantageous effect on the quality of the bristle tips.
  • the aforementioned ratio L / I is at least 4 and / or is less than or equal to 7, in particular less than or equal to 6.5.
  • a further embodiment of the method according to the invention provides in step a) above to clamp bristle tufts in a tuft holder such that the free length of the bristle tufts from the holder to the free, tapered first end is at least 12 mm and / or more than 40% of the total length of the uncut Tufts of bristles.
  • the bristles are pointed at both ends of the bristles, the large free length of the bristles being achieved by changing the position of the bristle tuft in the tuft holder, which is necessary to ensure a particularly high quality of the bristle tips.
  • the method for sharpening bristles on both sides is particularly suitable for brushes in which the bristles are folded and fastened in the brush head with a metal anchor or a wire loop.
  • These bristles are preferably used in small brushes, in particular toothbrushes, the bristles of which protrude approximately 10 mm to 15 mm from the brush head.
  • step b) and before step d) the tuft holder is rotated by 180 ° about an axis which is orthogonal to the longitudinal direction of the clamped bristles, around the bristle ends on the other side of the tuft holder in to bring a position for editing.
  • the unsanded bristle tufts preferably have a length of 26 mm to 32 mm and are ideal for toothbrushes with folded bristles due to this property.
  • the invention further relates in a further solution to a method for mechanically sharpening bristles for brushes, in particular toothbrushes, by grinding bristle tufts on a grinding surface of a rotating tool, which is characterized in that the bristle tufts progressively further in the direction during the ongoing grinding process are fed to the tool-side grinding surface and the relative speed between the grinding surface and the bristle tufts is increasingly reduced.
  • This solution can of course also be combined with the previously mentioned solution.
  • the tips of the bristles are first sharpened at a high grinding speed.
  • the bristles are then moved further and further towards the grinding surface, so that an increasingly larger section of the bristle ends can come into contact with the grinding surface.
  • the bristle end is also ground over an increasingly larger axial section.
  • the grinding speed relative speed between the tufts of bristles and the grinding surface
  • the bristle tufts moving further towards the grinding surface and the grinding speed being reduced continuously.
  • the grinding quality is extremely improved, as extensive test series have shown.
  • bristles can now be mechanically ground from materials that were previously not considered to be mechanically sharpenable, for example from nylon or PBT.
  • the tuft holder is preferably moved substantially in the longitudinal direction along the lateral surface during the grinding process.
  • the direction of travel of the tuft holder is in particular not parallel to the axis of rotation of the grinding roller.
  • the distance between the tuft holder and the lateral surface and / or axis of rotation is increasingly reduced during the method.
  • This arrangement of the bristles in relation to the grinding rollers also has a favorable effect on the sharpening of the bristle ends because they are increasingly sharpened over a greater length.
  • all the tufts of bristles of the tuft holder lie within the outer edges delimiting the lateral surface.
  • the tuft holder is preferably brought so close to the surface of the abrasive body that the most distant bristles rest against the abrasive body over their entire rotational path.
  • the smallest distance from the holder in the tuft holder to the grinding surface is in the range from 5 mm to 12 mm. This is to ensure that all bristles come into contact with the grinding wheel and are sharpened.
  • individual bristles it is of course possible for individual bristles to lie on top of one another at times and thus not all of the bristles have continuous contact with the grinding wheel.
  • a grinding device is also provided to achieve the above-mentioned object.
  • This grinder for mechanical Pointing bristles for brushes comprises at least one tuft holder with at least one receptacle for a tuft of bristles and at least one abrasive body with a grinding surface.
  • the tuft holder is designed with a holding unit which, in a closed position, allows the at least one bristle tuft to be clamped at different points on the bristle tuft over its length and in an open position to move the bristle tuft in the non-clamping position of the tuft holder relative to the tuft holder.
  • the grinding body is here a grinding roller with an outer surface designed as a grinding surface, which is preferably circular cylindrical or conical in shape. Furthermore, the tuft holder rotates about an axis of rotation during grinding.
  • the axis of rotation rotates parallel to the longitudinal direction of the clamped tufts of bristles and is at an angle of at least 80 ° to the axis of rotation of the grinding roller, and the ratio of the radius of the grinding roller to the distance of the tufts of bristles furthest from the axis of rotation of the tuft holder from the axis of rotation is between 1 and 4.
  • the tuft holder serves as a tool and later does not form part of the finished brush head.
  • the tuft holder enables the free length of the bristles to be set by its holding unit, which is necessary to achieve a particularly high quality of the bristle tips. Furthermore, the tuft holder allows grinding at both free ends, since the tufts have to be reclamped for this purpose, because their excessive length does not allow the tuft holder to be simply pivoted. Then the free length of the tuft not yet ground would not reach the minimum length free according to the invention.
  • the curved surface of the grinding rollers has an advantageous effect on the quality of the bristle tips.
  • the free length of the bristles from the holder to the free, tapered first end is preferably at least 12 mm and / or more than 40% of the total length of the unpolished bristle tuft. This ensures the necessary free length of the bristles for a high quality of the bristle tips.
  • the tuft holder has a plurality of receptacles for a plurality of tufts of bristles which can be pointed together in this way.
  • the holding unit preferably comprises pressure elements and at least one elastic element arranged between the pressure elements.
  • the elastic element surrounds a receiving opening for the bristle tuft and can reduce the cross section of the receiving opening by compression in order to hold the bristle tuft in the receiving. This structure enables one compact design and simple control of the holding unit.
  • the elastic element can be designed, for example, in the form of an O-ring or as a layer with a plurality of receiving openings. If O-rings are provided, there must of course be an O-ring on each holder.
  • the tuft holder can be rotated by 180 ° in order to sharpen both opposite bristle ends about an axis which is orthogonal to the longitudinal direction of the clamped bristles, in order to sharpen both ends.
  • the tuft holder rotates during grinding about an axis of rotation which is parallel to the longitudinal direction of the clamped bristles and at an angle of at least 80 ° to the axis of rotation of the grinding roller.
  • the bristle ends are favorably pointed by this relative movement.
  • the tuft holder is preferably mounted so as to be movable along the lateral surface essentially in the longitudinal direction.
  • the direction of travel of the tuft holder in particular does not run parallel to the axis of rotation of the grinding roller and / or the distance between the tuft holder and the lateral surface and / or axis of rotation is increasingly reduced during the method.
  • this has the advantage that the proportion of bristles in contact with the abrasive body increases with increasing travel distance and thus the bristles are processed more and more, which in turn has an advantageous effect on the bristles.
  • the ratio (R / r) of the radius of the grinding roller to the distance of the clamped bristle tuft furthest from the axis of rotation of the tuft holder from the axis of rotation is approximately between 1 and 4, in particular 1 to 3.
  • all the tufts of bristles of the tuft holder lie within the outer edges delimiting the lateral surface in plan view. This design ensures that all bristle ends are machined evenly and that they are sharply sharpened after the grinding process.
  • the tufts of bristles 12 are removed from a magazine 16 by a tuft separator 14, via a tuft holder 18 brought into position and pushed into the tuft holder 18 by a slide 20.
  • the bristle tufts 12 clamped in the tuft holder 18 are moved over the grinding body 22 and sharpened on their side that comes into contact with the grinding body 22.
  • the tuft holder 18 is rotated through 180 °.
  • the fourth step is followed by a grinding process analogous to the second step, this time sharpening the opposite bristle ends 24.
  • the bristle tufts 12 which are pointed on both sides, are emptied from the tuft holder 18 into a bristle container 26.
  • Figure 2 is the first step out Figure 1 shown in a perspective view.
  • the bristle tufts 12 with a length of approx. 26 mm to 32 mm (corresponds to the bristle length) and a diameter of approx. 1.5 mm to 3 mm, are removed from a magazine 16 by a tuft separator 14, via a tuft holder 18 in position brought and pushed by a slide 20 in the receptacles 28 of the tuft holder 18.
  • the bristle tufts 12 are arranged such that they have a relatively large free length L at the end to be processed in the following step, measured from the holder, more precisely from the stop of the holder closest to the end to be pointed (see Figure 10b ).
  • an upper limit can also be provided, namely less than or equal to 7, in particular less than or equal to 6.5.
  • the bristle tuft 12 is clamped in such a way that the free length of the end to be machined is at least 12 mm or more than 40% of the total length of the unpolished bristle tuft 12 is based on the holder.
  • the Figures 3 and 4th show the second step out Figure 1 in a perspective view.
  • the bristle tufts 12 held, for example clamped, in the tuft holder 18 are moved over the rotating grinding body 22, which in this embodiment is a grinding roller, on the circular cylindrical or conical lateral surface 30 (grinding surface) of which the grinding process is carried out.
  • the tuft holder 18 additionally rotates about an axis of rotation A, which is parallel to the longitudinal direction of the clamped tufts 12.
  • the tuft holder is along a linear path B, which in plan view is parallel to the axis of rotation X of the grinding roller or coincides with it.
  • the smallest distance a of the holder in the tuft holder 18 from the grinding surface is in the range from 5 mm to 10 mm.
  • the distance between the tuft holder 18 and the grinding body 22 can also be reduced by shaping the grinding body 22 in this way, for example in a conical manner Figure 5 that the distance between the tuft holder 18 and the surface of the grinding body 22 is reduced.
  • the ratio (R / r) of the radius of the grinding roller to the distance of the bristle tuft 12 held most distant to the axis of rotation A of the tuft holder 18 from the axis of rotation A in this embodiment is between 1 and 4, but can also be between 1 and 3.
  • all of the bristle tufts 12 of the tuft holder 18 are additionally located within the linear outer edges 40 of the grinding roller which delimit the lateral surface in plan view.
  • a cone angle ⁇ of the grinding body 22 is also shown.
  • the grinding process begins at the section of the grinding wheel 22 at which the lateral surface has a greater peripheral speed than in the end with the smaller diameter.
  • FIG. 5 shows five tuft holders 18 arranged side by side, which take up numerous tufts of bristles and rotate about their axes A.
  • the distance T3 of the tuft holder 18 from the axis of rotation R is still relatively large, so that only the axial end sections of the bristles are ground.
  • the grinding speed is relatively high because the grinding body 22 rotates quickly at the speed n1.
  • the speed of rotation and the speed of rotation are then reduced in steps or continuously from n2 to n1, and at the same time the distance of the tuft holder 18 from the axis of rotation R is reduced via T1 to T1.
  • the tuft holders 18 are not moved along a path B running transverse to the axis of rotation A, but only rotated and delivered in the direction of its axis of rotation A, which therefore represents the path B.
  • the rollers can of course also be fed in the direction of the tuft holder.
  • Figure 7 shows which different sections of the later finished bristle tip with which speeds and at what distance were generated.
  • Figure 8 shows different courses from speed change to distance change along which the grinding process is carried out.
  • the Figures 4 and 5 already show bristles pointed on one side, which are pointed at the second end.
  • the tufts of bristles are shown symbolically tapering.
  • the tufts of bristles look like the enlarged view in Figure 9 , bottom left, in which the individual bristles themselves are shown pointed.
  • Figure 9 is the third step out Figure 1 shown in a side view.
  • the tuft holder 18 is rotated by 180 ° in order to grind the other bristle ends 24 about an axis which is orthogonal to the longitudinal direction of the clamped bristle tufts 12.
  • the bristle tufts 12 are axially displaced within the tuft holder 18 (see arrow in Figure 9 ), e.g. B. with a slide 20 after the tuft holder 18 from a holding, for example clamping position ( Figure 10b ) in a non-holding, e.g. non-clamping position ( Figure 10a ) was brought.
  • the bristle tufts 12 have a free length L of at least 12 mm or more than 40% of the total length of the unpolished bristle tufts 12 at their not yet pointed end.
  • the ratio L / I of the free length L to the length l of the tapered tip to be produced is greater than or equal to 3, in particular greater than or equal to 4. This means that the corresponding ratio L / I also becomes when grinding the second end of the bristle tuft 12 set so that the two ends have the same tip shapes and tip lengths on their bristles.
  • FIGS. 10a and 10b show a tuft holder 18 with two receptacles 28 and each holding units 32 arranged therein, with the help of which the bristle tufts 12 can be attached over their length at different locations and moving the bristle tuft 12 in the non-clamping position of the tuft holder 18 relative to the tuft holder 18 is possible.
  • Figure 10a shows the open position of the holding unit 32, in which two plate-like pressure elements 34 are in an open, distant position and the elastic elements 36 arranged in between in the form of O-rings are in a non-clamping position.
  • FIG 10b the closed position of the holding unit 32 is shown, in which the two pressure elements 34 are in a closed, approximated position and the elastic elements 36 arranged between them are in a clamping, squeezed position.
  • the receiving openings surrounding the bristle tufts 12 are reduced in cross section by compression of the elastic elements 36 and thus clamp the bristle tufts 12 in the receptacles 28.

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Description

Die Erfindung betrifft ein Verfahren zum mechanischen Anspitzen von Borsten sowie eine Schleifvorrichtung zum mechanischen Anspitzen von Borsten.The invention relates to a method for mechanically sharpening bristles and a grinding device for mechanically sharpening bristles.

In verschiedenen Bürsten, insbesondere Zahnbürsten, kommen angespitzte Borsten zur Anwendung, da sich diese vorteilhaft auf die Reinigungseigenschaften der Bürste auswirken.Pointed bristles are used in various brushes, in particular toothbrushes, since these have an advantageous effect on the cleaning properties of the brush.

Zum Anspitzen von Borsten ist zum einen ein Verfahren bekannt, bei dem die Borsten als Borstenbüschel in einem Büschelhalter eingespannt und mechanisch mit Hilfe von Schleifvorrichtungen angespitzt werden. Ein solches Verfahren ist beispielsweise aus der EP 0 444 436 A2 bekannt. Dieses Verfahren hat den Nachteil, dass die Borsten nach aktuellem Stand der Technik nur bis zu einem Grad angespitzt werden können, der die Anforderungen an die Reinigungseigenschaften der Bürste nur unzureichend erfülltOn the one hand, a method is known for sharpening bristles, in which the bristles are clamped in a tuft holder as bristle tufts and are sharpened mechanically with the aid of grinding devices. Such a method is known for example from EP 0 444 436 A2 known. This method has the disadvantage that the bristles according to the current state of the art can only be sharpened to an extent that only insufficiently meets the requirements for the cleaning properties of the brush

Zum anderen ist ein chemisches Verfahren zum Anspitzen von Borsten bekannt, mit dem die Güte der Borstenspitzen verbessert werden kann. Hierbei werden die Borstenenden in eine stark basische oder saure Lösung getaucht und über einen Zeitraum von ca. 30 Minuten aus der Lösung herausgezogen. An der Stelle, an der die Borsten in Kontakt mit der Lösung stehen, löst sich die Oberfläche der Borsten auf und führt so zu einem graduell abnehmenden Durchmesser und somit zur Anspitzung der Borstenenden.On the other hand, a chemical method for sharpening bristles is known, with which the quality of the bristle tips can be improved. The bristle ends are immersed in a strongly basic or acidic solution and pulled out of the solution over a period of about 30 minutes. At the point where the bristles are in contact with the solution, the surface of the bristles dissolves and thus leads to a gradually decreasing diameter and thus to the bristle ends.

Der Nachteil des chemischen Verfahrens besteht in den umweltschädlichen Eigenschaften der zum Einsatz kommenden Lösung. So werden nicht nur die Mitarbeiter und die Umwelt durch die Lösung gefährdet, sondern es werden auch die Betriebsmittel, beispielsweise durch Korrosion, geschädigt. Dies führt zu geringeren Standzeiten der Maschinen und Werkzeuge und ist daher aus ökonomischer Sicht nachteilig.The disadvantage of the chemical process is the environmentally harmful properties of the solution used. Not only are the employees and the environment endangered by the solution, but also the operating resources, for example due to corrosion, are damaged. This leads to a shorter service life of the machines and tools and is therefore disadvantageous from an economic point of view.

Weiter sind aus der EP 0 346 646 A2 sowie der US 2,554,777 A verschiedene Verfahren zum mechanischen Abrunden von Borsten sowie entsprechende Schleifvorrichtung zum Durchführen dieser Verfahren bekannt.Next are from the EP 0 346 646 A2 as well as the US 2,554,777 A Various methods for the mechanical rounding of bristles and corresponding grinding device for carrying out these methods are known.

Die BE 1 013 968 A3 zeigt ferner eine Vorrichtung, mittels der Borsten, die in einem Bürstenkopf befestigt sind, mit einer Kontur versehen werden können.The BE 1 013 968 A3 also shows a device by means of which bristles, which are fastened in a brush head, can be provided with a contour.

Aufgabe der Erfindung ist es ein Verfahren und eine Vorrichtung zum Anspitzen von Borsten bereitzustellen, die eine hohe Güte der Borstenspitzen gewährleistet, ohne auf umweltschädliche chemische Lösungsmittel zurückzugreifen.The object of the invention is to provide a method and a device for sharpening bristles which ensures a high quality of the bristle tips without resorting to environmentally harmful chemical solvents.

Diese Aufgabe wird erfindungsgemäß durch ein Verfahren zum mechanischen Anspitzen von Borsten für Bürsten, insbesondere Zahnbürsten, durch Schleifen, mit folgenden Schritten gelöst:

  1. a) Halten von Borstenbüschel (12) in einen Büschelhalter (18) derart, dass das Verhältnis (L/I) der freien Länge (L) des Borstenbüschels, gemessen ab der Halterung bis zum freien, anzuspitzenden Ende, zur Länge (I) der zu erzeugenden, konischen Spitze der Borsten größer gleich 3 ist, und
  2. b) Schleifen der Borstenenden am ersten freien Ende.
This object is achieved according to the invention by a method for mechanically sharpening bristles for brushes, in particular toothbrushes, by grinding, with the following steps:
  1. a) Holding bristle tufts (12) in a tuft holder (18) such that the ratio (L / I) of the free length (L) of the bristle tuft, measured from the holder to the free end to be pointed, to the length (I) of to be generated, conical tip of the bristles is greater than or equal to 3, and
  2. b) grinding the bristle ends at the first free end.

Zum Schleifen werden hierbei eine oder mehrere Schleifwalzen verwendet, die vorzugsweise eine kreiszylindrische oder konische Mantelfläche, an der der Schleifprozess ausgeführt wird, haben. Ferner rotiert der Büschelhalter während des Schleifens um eine Drehachse, die parallel zur Längsrichtung der eingespannten Borsten und in einem Winkel von mindestens 80° zur Rotationsachse der Schleifwalze steht. Diese Relativbewegung begünstigt das Anspitzen der Borstenenden. Das Verhältnis (R/r) vom Radius der Schleifwalze zum Abstand des am weitesten zur Drehachse des Büschelhalters entfernten, eingespannten Borstenbüschels von der Drehachse beträgt 1 bis 4, insbesondere 1 bis 3. Dieses Verhältnis wirkt sich hierbei vorteilhaft auf die Güte der Borstenspitzen aus.Here, one or more grinding rollers are used for grinding, which preferably have a circular cylindrical or conical outer surface on which the grinding process is carried out. Furthermore, the tuft holder rotates during grinding about an axis of rotation which is parallel to the longitudinal direction of the clamped bristles and at an angle of at least 80 ° to the axis of rotation of the grinding roller. This relative movement favors the sharpening of the bristle ends. The ratio (R / r) of the radius of the grinding roller to the distance of the clamped bristle tuft furthest from the axis of rotation of the tuft holder from the axis of rotation is 1 to 4, in particular 1 to 3. This ratio has an advantageous effect on the quality of the bristle tips.

Die vorliegende Erfindung gibt bei der Bearbeitung eine gegenüber dem Stand der Technik völlig andere Vorgabe, wie weit das Borstenbüschel gegenüber der Halterung vorstehen soll, wenn die Borsten eine Spitze von vorbestimmter Länge haben sollen, über welche sie konisch zulaufen. Wird beispielsweise das Borstenbüschel so geschliffen, dass die einzelnen Borsten eine angespitzt Länge von 4 mm haben oder haben sollen, so wird das Borstenbüschel derart in den Büschelhalter eingespannt, dass zu Beginn des Schleifvorgangs die frei auskragende Länge des Borstenbüschels mindestens 12 mm beträgt. Als Halterung ist dabei diejenige Stelle des Büschelhalters zu verstehen, die dem gerade geschliffenen Ende des Borstenbüschels am nächsten ist, aber Kontakt mit dem Borstenbüschel hat.When machining, the present invention gives a completely different specification from the prior art as to how far the bristle tuft should protrude from the holder if the bristles have a tip of a predetermined length should have over which they taper. If, for example, the bristle tuft is ground so that the individual bristles have or should have a tipped length of 4 mm, the bristle tuft is clamped in the tuft holder in such a way that the freely projecting length of the bristle tuft is at least 12 mm at the start of the grinding process. The holder is to be understood as the point of the tuft holder that is closest to the just ground end of the bristle tuft but has contact with the bristle tuft.

Diese große freie Länge der Borsten erweist sich beim Schleifvorgang als vorteilhaft, so dass eine besonders hohe Güte der Borstenspitzen erzielt wird. Im Stand der Technik wurden die Borstenbüschel stets so eingespannt, dass ihre freie Länge deutlich unter diesem Verhältnis lag. Vorzugsweise betrug im Stand der Technik sogar die freie Länge der eingespannten, zu schleifenden Borstenbüschel weniger als die Hälfte der Gesamtlänge. Im Stand der Technik sah man die relativ kurze, freie Länge als vorteilhaft, weil man glaubte, sie verbessere die Lagestabilität der Borsten und die Vorhersehbarkeit des Schleifvorgangs, was man als vorteilhaft ansah. Die Erfindung sorgt jedoch dafür, dass gerade durch die extreme Elastizität der überlang vorstehenden Borstenbüschel die Büschel in einem spitzeren Winkel und viel exakter gespitzt werden. Die Borsten erhalten eine konisch zulaufende Spitze.This large free length of the bristles proves to be advantageous during the grinding process, so that a particularly high quality of the bristle tips is achieved. In the prior art, the tufts of bristles were always clamped in such a way that their free length was significantly below this ratio. In the prior art, the free length of the clamped tufts of bristles to be ground was preferably less than half of the total length. In the prior art, the relatively short, free length was considered advantageous because it was believed to improve the positional stability of the bristles and the predictability of the grinding process, which was considered advantageous. However, the invention ensures that the tufts are sharpened at a more acute angle and much more precisely because of the extreme elasticity of the bristle tufts protruding long. The bristles have a tapered tip.

Dieses Verfahren eignet sich auch für Bürsten mit ankerfrei befestigten Borsten, bei denen die einseitig angespitzten Borsten mit ihrem nicht angespitzten Ende im Bürstenkopf befestigt, insbesondere verklebt oder verschweißt, werden ebenso wie für Borstenbüschel, die über einen Anker oder eine Drahtschlaufe befestigt werden.This method is also suitable for brushes with bristles fastened without anchors, in which the bristles which have been pointed on one side are fastened, in particular glued or welded, with their non-sharpened end in the brush head, and are also used for bristle tufts which are fastened via an anchor or a wire loop.

Die gekrümmte Oberfläche der Schleifwalzen wirkt sich hierbei vorteilhaft auf die Güte der Borstenspitzen aus. Natürlich ist es auch möglich, die Schleifwalzen mit beliebigen Formen von rotationssymmetrischen Mantelflächen auszuführen. Es müssen nicht zwingend kreiszylindrische oder konische Formen verwendet werden.The curved surface of the grinding rollers has an advantageous effect on the quality of the bristle tips. Of course, it is also possible to design the grinding rollers with any shape of rotationally symmetrical lateral surfaces. Circular cylindrical or conical shapes do not necessarily have to be used.

Gemäß einer Ausführungsform der vorliegenden Erfindung beträgt das zuvor erwähnte Verhältnis L/I mindestens 4 und/oder ist kleiner gleich 7, insbesondere kleiner gleich 6,5.According to one embodiment of the present invention, the aforementioned ratio L / I is at least 4 and / or is less than or equal to 7, in particular less than or equal to 6.5.

Um das andere Ende des Borstenbüschels nach dem Schleifen des ersten Endes zu schleifen und die Borsten anzuspritzen sieht die Erfindung folgende weitere Schritte vor:

  • c) Ändern der Position des Borstenbüschels im Büschelhalters, so das für das noch nicht geschliffene, freie Ende dasselbe Verhältnis eingestellt wird, welches zum Anspitzen des bereits gespitzten Endes eingestellt war, und
  • d) Schleifen der Borstenenden am zweiten freien Ende.
In order to grind the other end of the bristle tuft after grinding the first end and to spray the bristles, the invention provides the following further steps:
  • c) changing the position of the bristle tuft in the tuft holder so that the same ratio is set for the not yet ground, free end, which was set for sharpening the already tipped end, and
  • d) grinding the bristle ends at the second free end.

Eine weitere Ausführungsform des erfindungsgemäßen Verfahrens sieht im vorgenannten Schritt a) vor, Borstenbüschel in einen Büschelhalter so einzuspannen, dass die freie Länge der Borstenbüschel von der Halterung zum freien, anzuspitzenden ersten Ende mindestens 12 mm und/oder mehr als 40% der Gesamtlänge des ungeschliffenen Borstenbüschels beträgt.A further embodiment of the method according to the invention provides in step a) above to clamp bristle tufts in a tuft holder such that the free length of the bristle tufts from the holder to the free, tapered first end is at least 12 mm and / or more than 40% of the total length of the uncut Tufts of bristles.

In einer bevorzugten Ausführungsform umfasst dieses verfeinerte Verfahren im Anschluss an Schritt b) folgende weitere Schritte:

  • e) Ändern der Position des Borstenbüschels im Büschelhalter, so dass die freie Länge der Borstenbüschel von der Halterung zum freien, entgegengesetzten Ende des Borstenbüschels mindestens 12 mm und/oder mehr als 40% der Gesamtlänge des ungeschliffenen Borstenbüschels beträgt; und
  • f) Schleifen der Borstenenden am zweiten freien Ende.
In a preferred embodiment, this refined method comprises the following further steps following step b):
  • e) changing the position of the bristle tuft in the tuft holder so that the free length of the bristle tufts from the holder to the free, opposite end of the bristle tuft is at least 12 mm and / or more than 40% of the total length of the unpolished bristle tuft; and
  • f) grinding the bristle ends at the second free end.

Hierdurch werden die Borsten an beiden Borstenenden angespitzt, wobei durch das Ändern der Position des Borstenbüschels im Büschelhalter die große freie Länge der Borsten erreicht wird, die notwendig ist, um eine besonders hohe Güte der Borstenspitzen zu gewährleisten.As a result, the bristles are pointed at both ends of the bristles, the large free length of the bristles being achieved by changing the position of the bristle tuft in the tuft holder, which is necessary to ensure a particularly high quality of the bristle tips.

Das Verfahren zum beidseitigen Anspitzen von Borsten ist besonders für Bürsten geeignet, bei denen die Borsten gefaltet und mit einem Metallanker oder einer Drahtschlaufe im Bürstenkopf befestigt werden.The method for sharpening bristles on both sides is particularly suitable for brushes in which the bristles are folded and fastened in the brush head with a metal anchor or a wire loop.

Bevorzugt werden diese Borsten in kleinen Bürsten, insbesondere Zahnbürsten, verwendet, deren Borsten ca. 10 mm bis 15 mm aus dem Bürstenkopf herausstehen.These bristles are preferably used in small brushes, in particular toothbrushes, the bristles of which protrude approximately 10 mm to 15 mm from the brush head.

Im Verfahren kann es vorgesehen sein, dass der Büschelhalter nach dem Schritt b) und vor dem Schritt d) um eine Achse, die orthogonal zur Längsrichtung der eingespannten Borsten steht, um 180° gedreht wird, um die Borstenenden auf der anderen Seite des Büschelhalters in eine Position zum Bearbeiten zu bringen.In the method it can be provided that after step b) and before step d) the tuft holder is rotated by 180 ° about an axis which is orthogonal to the longitudinal direction of the clamped bristles, around the bristle ends on the other side of the tuft holder in to bring a position for editing.

Vorzugsweise haben die ungeschliffenen Borstenbüschel eine Länge von 26 mm bis 32 mm und eignen sich aufgrund dieser Eigenschaft ideal für Zahnbürsten mit gefalteten Borsten.The unsanded bristle tufts preferably have a length of 26 mm to 32 mm and are ideal for toothbrushes with folded bristles due to this property.

Die Erfindung betrifft über hinaus in einer weiteren Lösung ein Verfahren zum mechanischen Anspitzen von Borsten für Bürsten, insbesondere Zahnbürsten, durch Schleifen von Borstenbüscheln auf einer Schleifoberfläche eines sich drehenden Werkzeugs, das dadurch gekennzeichnet ist, dass die Borstenbüschel während des laufenden Schleifprozesses zunehmend weiter in Richtung der werkzeugseitigen Schleifoberfläche zugestellt werden und dabei die Relativgeschwindigkeit zwischen der Schleifoberfläche und den Borstenbüscheln zunehmend reduziert wird. Diese Lösung lässt sich mit der zuvor genannten Lösung natürlich auch kombinieren.The invention further relates in a further solution to a method for mechanically sharpening bristles for brushes, in particular toothbrushes, by grinding bristle tufts on a grinding surface of a rotating tool, which is characterized in that the bristle tufts progressively further in the direction during the ongoing grinding process are fed to the tool-side grinding surface and the relative speed between the grinding surface and the bristle tufts is increasingly reduced. This solution can of course also be combined with the previously mentioned solution.

Die Idee hierbei ist, dass die Spitzen der Borsten zuerst mit hoher Schleifgeschwindigkeit angespitzt werden. Anschließend werden die Borsten immer weiter in Richtung zur Schleifoberfläche zugestellt, sodass ein immer größerer Abschnitt der Borstenenden mit der Schleifoberfläche in Kontakt treten kann. So wird ferner das Borstenende über einen immer größer werdenden axialen Abschnitt geschliffen. Dabei nimmt jedoch die Schleifgeschwindigkeit (Relativgeschwindigkeit zwischen dem Borstenbüschel und der Schleifoberfläche) auch zunehmend ab, wobei das weitere Zustellen der Borstenbüschel in Richtung zur Schleifoberfläche und das Reduzieren der Schleifgeschwindigkeit kontinuierlich erfolgen kann. Die Schleifqualität wird dadurch extrem verbessert, wie umfangreiche Versuchsreihen ergeben haben. Zudem lassen sich nun Borsten aus Materialien mechanisch schleifen, die bislang als nicht mechanisch anspitzbar galten, zum Beispiel aus Nylon oder PBT. Dies wird dadurch erreicht, dass dann, wenn die Borsten über eine relativ große Länge auf der Schleifoberfläche aufliegen und die Reibung damit steigt, die Schleifgeschwindigkeit reduziert wird. Damit wird weniger Reibungswärme erzeugt. Die Borsten werden nicht mehr nahe an die kritische Schmelztemperatur gebracht. Ferner ist der größte Materialabtrag ohnehin an den Enden der Borsten notwendig, und an dieser Stelle wurde ja bereits zu Beginn des Schleifvorgangs ein großer Teil des notwendigen Materialabtrags gemacht. Die Schleifoberfläche bewegt sich beim erfindungsgemäßen Verfahren relativ im Raum. Die Borstenbüschel werden beim Schleifen gedreht, indem der Büschelhalter ebenfalls dreht.The idea here is that the tips of the bristles are first sharpened at a high grinding speed. The bristles are then moved further and further towards the grinding surface, so that an increasingly larger section of the bristle ends can come into contact with the grinding surface. In this way, the bristle end is also ground over an increasingly larger axial section. However, the grinding speed (relative speed between the tufts of bristles and the grinding surface) is also increasingly decreasing, with the bristle tufts moving further towards the grinding surface and the grinding speed being reduced continuously. The grinding quality is extremely improved, as extensive test series have shown. In addition, bristles can now be mechanically ground from materials that were previously not considered to be mechanically sharpenable, for example from nylon or PBT. This is achieved in that when the bristles rest on the grinding surface over a relatively large length and the friction increases with it, the grinding speed is reduced. This means that less frictional heat is generated. The bristles are no longer brought close to the critical melting temperature. Furthermore, the greatest material removal is necessary anyway at the ends of the bristles, and at this point a large part of the necessary material removal was made at the start of the grinding process. In the method according to the invention, the grinding surface moves relatively in space. The bristle tufts are rotated during grinding by the tuft holder also rotating.

Vorzugsweise wird der Büschelhalter während des Schleifprozesses im Wesentlichen in Längsrichtung an der Mantelfläche entlang verfahren. Hierbei verläuft die Verfahrrichtung des Büschelhalters insbesondere nicht parallel zur Rotationsachse der Schleifwalze. Zusätzlich oder anstelle ist es insbesondere möglich, dass sich der Abstand des Büschelhalters zur Mantelfläche und/oder Rotationsachse während des Verfahrens zunehmend verringert. Auch diese Anordnung der Borsten gegenüber den Schleifwalzen wirkt sich günstig auf das Anspitzen der Borstenenden aus, weil diese zunehmend über eine größere Länge spitzt werden.The tuft holder is preferably moved substantially in the longitudinal direction along the lateral surface during the grinding process. In this case, the direction of travel of the tuft holder is in particular not parallel to the axis of rotation of the grinding roller. In addition to or instead of, it is in particular possible that the distance between the tuft holder and the lateral surface and / or axis of rotation is increasingly reduced during the method. This arrangement of the bristles in relation to the grinding rollers also has a favorable effect on the sharpening of the bristle ends because they are increasingly sharpened over a greater length.

In einer vorteilhaften Ausführungsform liegen mit Sicht in Richtung der Drehachse des Büschelhalters, sämtliche Borstenbüschel des Büschelhalters innerhalb der die Mantelfläche begrenzenden Außenränder.In an advantageous embodiment, with a view in the direction of the axis of rotation of the tuft holder, all the tufts of bristles of the tuft holder lie within the outer edges delimiting the lateral surface.

Der Büschelhalter wird vorzugsweise so nahe an die Oberfläche des Schleifkörpers herangebracht, dass die am weitesten entfernten Borsten über ihre gesamte Rotationsbahn am Schleifkörper anliegen. Insbesondere ist es vorteilhaft, wenn bei einer Büschellänge von 26 mm bis 32 mm der kleinste Abstand von der Halterung im Büschelhalter zur Schleifoberfläche im Bereich von 5 mm bis 12 mm liegt. Hierbei soll sichergestellt werden, dass alle Borsten in Kontakt mit dem Schleifkörper kommen und angespitzt werden. Natürlich ist es jedoch möglich, dass einzelne Borsten zeitweise übereinander liegen und somit nicht alle Borsten ununterbrochen Kontakt zum Schleifkörper haben.The tuft holder is preferably brought so close to the surface of the abrasive body that the most distant bristles rest against the abrasive body over their entire rotational path. In particular, it is advantageous if, with a tuft length of 26 mm to 32 mm, the smallest distance from the holder in the tuft holder to the grinding surface is in the range from 5 mm to 12 mm. This is to ensure that all bristles come into contact with the grinding wheel and are sharpened. However, it is of course possible for individual bristles to lie on top of one another at times and thus not all of the bristles have continuous contact with the grinding wheel.

Erfindungsgemäß ist zur Lösung der oben genannten Aufgabe auch eine Schleifvorrichtung vorgesehen. Diese Schleifvorrichtung zum mechanischen Anspitzen von Borsten für Bürsten, insbesondere Zahnbürsten, umfasst mindestens einen Büschelhalter mit mindestens einer Aufnahme für ein Borstenbüschel und mindestens einen Schleifkörper mit einer Schleifoberfläche. Der Büschelhalter ist dabei mit einer Halteeinheit ausgebildet, die in einer geschlossenen Position ein Klemmen des zumindest einen Borstenbüschels an unterschiedlichen Stellen des Borstenbüschels über dessen Länge und in einer offenen Position ein Verschieben des Borstenbüschels in nicht klemmender Stellung des Büschelhalters relativ zum Büschelhalter erlaubt. Der Schleifkörper ist hierbei eine Schleifwalze mit einer als Schleifoberfläche ausgebildeten Mantelfläche, die vorzugsweise kreiszylindrisch oder konisch geformt ist. Ferner rotiert der Büschelhalter während des Schleifens um eine Drehachse. Die Drehachse rotiert parallel zur Längsrichtung des eingespannten Borstenbüschels und in einem Winkel von mindestens 80° zur Rotationsachse der Schleifwalze steht, und das Verhältnis vom Radius der Schleifwalze zum Abstand des am weitesten zur Drehachse des Büschelhalters entfernten, gehaltenen Borstenbüschels von der Drehachse beträgt zwischen 1 und 4. Der Büschelhalter dient als Werkzeug und bildet später keinen Teil des fertigen Bürstenkopfes. Der Büschelhalter ermöglicht es durch seine Halteeinheit, die freie Länge der Borsten einzustellen, die zum Erzielen einer besonders hohen Güte der Borstenspitzen notwendig ist. Ferner erlaubt es der Büschelhalter, an beiden freien Enden zu schleifen, da die Büschel zu diesem Zweck umgespannt werden müssen, denn ihre übergroße vorstehende Länge erlaubt es nicht, den Büschelhalter einfach zu schwenken. Dann würde nämlich die freie Länge des noch nicht geschliffenen Büschels nicht die erfindungsgemäß freie Mindestlänge erreichen. Die gekrümmte Oberfläche der Schleifwalzen wirkt sich hierbei vorteilhaft auf die Güte der Borstenspitzen aus.According to the invention, a grinding device is also provided to achieve the above-mentioned object. This grinder for mechanical Pointing bristles for brushes, in particular toothbrushes, comprises at least one tuft holder with at least one receptacle for a tuft of bristles and at least one abrasive body with a grinding surface. The tuft holder is designed with a holding unit which, in a closed position, allows the at least one bristle tuft to be clamped at different points on the bristle tuft over its length and in an open position to move the bristle tuft in the non-clamping position of the tuft holder relative to the tuft holder. The grinding body is here a grinding roller with an outer surface designed as a grinding surface, which is preferably circular cylindrical or conical in shape. Furthermore, the tuft holder rotates about an axis of rotation during grinding. The axis of rotation rotates parallel to the longitudinal direction of the clamped tufts of bristles and is at an angle of at least 80 ° to the axis of rotation of the grinding roller, and the ratio of the radius of the grinding roller to the distance of the tufts of bristles furthest from the axis of rotation of the tuft holder from the axis of rotation is between 1 and 4. The tuft holder serves as a tool and later does not form part of the finished brush head. The tuft holder enables the free length of the bristles to be set by its holding unit, which is necessary to achieve a particularly high quality of the bristle tips. Furthermore, the tuft holder allows grinding at both free ends, since the tufts have to be reclamped for this purpose, because their excessive length does not allow the tuft holder to be simply pivoted. Then the free length of the tuft not yet ground would not reach the minimum length free according to the invention. The curved surface of the grinding rollers has an advantageous effect on the quality of the bristle tips.

Vorzugsweise beträgt die freie Länge der Borsten von der Halterung zum freien, anzuspitzenden ersten Ende mindestens 12 mm und/oder mehr als 40% der Gesamtlänge des ungeschliffenen Borstenbüschels. Somit ist die notwendige freie Länge der Borsten für eine hohe Güte der Borstenspitzen sichergestellt.The free length of the bristles from the holder to the free, tapered first end is preferably at least 12 mm and / or more than 40% of the total length of the unpolished bristle tuft. This ensures the necessary free length of the bristles for a high quality of the bristle tips.

In einer vorteilhaften Ausführungsform verfügt der Büschelhalter über mehrere Aufnahmen für mehrere Borstenbüschel, die auf diese Weise zusammen angespitzt werden können.In an advantageous embodiment, the tuft holder has a plurality of receptacles for a plurality of tufts of bristles which can be pointed together in this way.

Die Halteeinheit umfasst vorzugsweise Druckelemente und zumindest ein zwischen den Druckelementen angeordnetes elastisches Element. Das elastische Element umgibt hierbei eine Aufnahmeöffnung für das Borstenbüschel und kann durch Kompression den Querschnitt der Aufnahmeöffnung reduzieren, um das Borstenbüschel in der Aufnahme zu halten. Dieser Aufbau ermöglicht eine kompakte Gestaltung sowie eine einfache Steuerung der Halteeinheit. Das elastische Element kann hierbei beispielsweise in Form eines O-Rings oder als Schicht mit mehreren durchführenden Aufnahmeöffnungen gestaltet sein. Wenn O-Ringe vorgesehen sind, muss natürlich an jeder Aufnahme ein O-Ring vorhanden sein.The holding unit preferably comprises pressure elements and at least one elastic element arranged between the pressure elements. The elastic element surrounds a receiving opening for the bristle tuft and can reduce the cross section of the receiving opening by compression in order to hold the bristle tuft in the receiving. This structure enables one compact design and simple control of the holding unit. The elastic element can be designed, for example, in the form of an O-ring or as a layer with a plurality of receiving openings. If O-rings are provided, there must of course be an O-ring on each holder.

Der Büschelhalter kann zum Anspitzen von beiden entgegengesetzten Borstenenden um eine Achse, die orthogonal zur Längsrichtung der eingespannten Borsten steht, um 180° gedreht werden, um beide Enden zu spitzen.The tuft holder can be rotated by 180 ° in order to sharpen both opposite bristle ends about an axis which is orthogonal to the longitudinal direction of the clamped bristles, in order to sharpen both ends.

Der Büschelhalter rotiert während des Schleifens um eine Drehachse, die parallel zur Längsrichtung der eingespannten Borsten und in einem Winkel von mindestens 80° zur Rotationsachse der Schleifwalze steht. Durch diese Relativbewegung werden die Borstenenden günstig angespitzt.The tuft holder rotates during grinding about an axis of rotation which is parallel to the longitudinal direction of the clamped bristles and at an angle of at least 80 ° to the axis of rotation of the grinding roller. The bristle ends are favorably pointed by this relative movement.

Vorzugsweise ist der Büschelhalter im Wesentlichen in Längsrichtung an der Mantelfläche entlang verfahrbar gelagert. Hierbei verläuft die Verfahrrichtung des Büschelhalters insbesondere nicht parallel zur Rotationsachse der Schleifwalze und/oder es verringert sich der Abstand des Büschelhalters zur Mantelfläche und/oder Rotationsachse während des Verfahrens zunehmend. Dies hat, wie gesagt, den Vorteil, dass der Anteil der Borsten in Kontakt mit dem Schleifkörper mit zunehmendem Verfahrweg steigt und somit die Borsten zunehmend stärker bearbeitet werden, was wiederum einen vorteilhaften Effekt auf das Anspitzen der Borsten hat.The tuft holder is preferably mounted so as to be movable along the lateral surface essentially in the longitudinal direction. The direction of travel of the tuft holder in particular does not run parallel to the axis of rotation of the grinding roller and / or the distance between the tuft holder and the lateral surface and / or axis of rotation is increasingly reduced during the method. As has been said, this has the advantage that the proportion of bristles in contact with the abrasive body increases with increasing travel distance and thus the bristles are processed more and more, which in turn has an advantageous effect on the bristles.

Gemäß einer bevorzugten Ausführungsform ist vorgesehen, dass das Verhältnis (R/r) vom Radius der Schleifwalze zum Abstand des am weitesten zur Drehachse des Büschelhalters entfernten, eingespannten Borstenbüschels von der Drehachse in etwa zwischen 1 und 4, insbesondere 1 bis 3, beträgt. Hierbei liegen mit Sicht in Richtung der Drehachse des Büschelhalters insbesondere sämtliche Borstenbüschel des Büschelhalters innerhalb der die Mantelfläche in Draufsicht begrenzenden Außenränder. Durch diese Gestaltung wird sichergestellt, dass alle Borstenenden gleichmäßig bearbeitet werden und nach dem Schleifvorgang vergleichbar gut angespitzt sind.According to a preferred embodiment, it is provided that the ratio (R / r) of the radius of the grinding roller to the distance of the clamped bristle tuft furthest from the axis of rotation of the tuft holder from the axis of rotation is approximately between 1 and 4, in particular 1 to 3. Here, with a view in the direction of the axis of rotation of the tuft holder, in particular all the tufts of bristles of the tuft holder lie within the outer edges delimiting the lateral surface in plan view. This design ensures that all bristle ends are machined evenly and that they are sharply sharpened after the grinding process.

Weitere Vorteile und Merkmale ergeben sich aus der nachfolgenden Beschreibung in Verbindung mit den beigefügten Zeichnungen. In diesen zeigen:

  • Figur 1 in einer Seitenansicht den erfindungsgemäßen Verfahrensablauf der Schritte zum beidseitigen Anspitzen von Borsten in einer erfindungsgemäßen Schleifvorrichtung,
  • Figur 2 in einer perspektivischen Ansicht die Befüllung eines Büschelhalters mit Borstenbüscheln aus einem Magazin,
  • Figur 3 in einer perspektivischen Ansicht den erfindungsgemäßen Schleifvorgang der Borstenbüschel eines Büschelhalters an einer Schleifwalze einer erfindungsgemäßen Schleifvorrichtung,
  • Figur 4 den Schleifvorgang aus Figur 3 in einer Seitenansicht,
  • Figur 5 eine Seitenansicht einer Variante der erfindungsgemäßen Schleifvorrichtung mit einem konischen Schleifkörper,
  • Figur 6 drei verschiedene Schritte beim Schleifen von zahlreichen Borstenbüscheln,
  • Figur 7 eine Borste, deren angespritztes Ende in verschiedene Abschnitte unterteilt ist,
  • Figur 8 ein Diagramm, welches eine Relation von Zustelltiefe und Drehgeschwindigkeit des Schleifkörpers zeigt,
  • Figur 9 in einer Seitenansicht die in einem Büschelhalter eingespannten Borstenbüschel, und
  • Figur 10a und Figur 10b in einer Schnittansicht die Aufnahmen eines Büschelhalters in offener bzw. geschlossener Stellung.
Further advantages and features result from the following description in conjunction with the attached drawings. In these show:
  • Figure 1 in a side view the process sequence according to the invention of the steps for sharpening bristles on both sides in a grinding device according to the invention,
  • Figure 2 a perspective view of the filling of a tuft holder with tufts of bristles from a magazine,
  • Figure 3 in a perspective view the grinding process according to the invention of the bristle tufts of a tuft holder on a grinding roller of a grinding device according to the invention,
  • Figure 4 the grinding process Figure 3 in a side view,
  • Figure 5 a side view of a variant of the grinding device according to the invention with a conical grinding body,
  • Figure 6 three different steps when sanding numerous tufts of bristles,
  • Figure 7 a bristle, the molded end of which is divided into different sections,
  • Figure 8 1 shows a diagram which shows a relationship between the depth of feed and the rotational speed of the grinding wheel,
  • Figure 9 in a side view the tufts of bristles clamped in a tuft holder, and
  • Figure 10a and Figure 10b in a sectional view, the recordings of a tuft holder in the open or closed position.

In Figur 1 ist der Verfahrensablauf zum beidseitigen Anspitzen von Borsten für Bürsten, insbesondere Zahnbürsten, unter Verwendung einer Schleifvorrichtung 10 in fünf Schritten dargestellt.In Figure 1 The process sequence for sharpening bristles on both sides for brushes, in particular toothbrushes, is shown in five steps using a grinding device 10.

Im ersten Schritt werden die Borstenbüschel 12 von einem Büschelvereinzelner 14 einem Magazin 16 entnommen, über einem Büschelhalter 18 in Position gebracht und von einem Schieber 20 in den Büschelhalter 18 geschoben.In the first step, the tufts of bristles 12 are removed from a magazine 16 by a tuft separator 14, via a tuft holder 18 brought into position and pushed into the tuft holder 18 by a slide 20.

Im zweiten Schritt werden die in dem Büschelhalter 18 eingespannten Borstenbüschel 12 über den Schleifkörper 22 bewegt und auf ihrer mit dem Schleifkörper 22 in Kontakt kommenden Seite angespitzt.In the second step, the bristle tufts 12 clamped in the tuft holder 18 are moved over the grinding body 22 and sharpened on their side that comes into contact with the grinding body 22.

Im folgenden dritten Schritt wird der Büschelhalter 18 um 180° gedreht.In the following third step, the tuft holder 18 is rotated through 180 °.

Im vierten Schritt folgt ein zum zweiten Schritt analog verlaufender Schleifprozess, wobei dieses Mal die entgegengesetzten Borstenenden 24 angespitzt werden.The fourth step is followed by a grinding process analogous to the second step, this time sharpening the opposite bristle ends 24.

Im fünften und gleichzeitig letzen Schritt werden die beidseitig angespitzten Borstenbüschel 12 aus dem Büschelhalter 18 in einen Borstenbehälter 26 entleert.In the fifth and at the same time last step, the bristle tufts 12, which are pointed on both sides, are emptied from the tuft holder 18 into a bristle container 26.

In Figur 2 ist der erste Schritt aus Figur 1 in einer perspektivischen Ansicht gezeigt. Die Borstenbüschel 12, mit einer Länge von ca. 26 mm bis 32 mm (entspricht der Borstenlänge) und einem Durchmesser von ca. 1,5 mm bis 3 mm, werden von einem Büschelvereinzelner 14 einem Magazin 16 entnommen, über einem Büschelhalter 18 in Position gebracht und durch einen Schieber 20 in die Aufnahmen 28 des Büschelhalters 18 geschoben. Hierbei werden die Borstenbüschel 12 so angeordnet, dass diese an dem im folgenden Schritt zu bearbeitenden Ende eine relativ große freie Länge L, gemessen von der Halterung, genauer gesagt von der dem zu spitzenden Ende nächsten Haltestelle der Halterung (siehe Figur 10b), besitzen. Beim Schleifen wird (siehe Figur 7) an jeder Borsten eine komisch zulaufende Spitze hergestellt, die eine Länge l aufweist. Diese Länge l ist konstruktiv vorgegeben. Das Borstenbüschel 12 wird nun so eingestellt, dass das zu bearbeitende frei Ende entsprechend weit gegenüber der Halterung vorsteht, um ein Verhältnis L/I größer gleich 3, insbesondere größer gleich 4 zu erreichen.In Figure 2 is the first step out Figure 1 shown in a perspective view. The bristle tufts 12, with a length of approx. 26 mm to 32 mm (corresponds to the bristle length) and a diameter of approx. 1.5 mm to 3 mm, are removed from a magazine 16 by a tuft separator 14, via a tuft holder 18 in position brought and pushed by a slide 20 in the receptacles 28 of the tuft holder 18. Here, the bristle tufts 12 are arranged such that they have a relatively large free length L at the end to be processed in the following step, measured from the holder, more precisely from the stop of the holder closest to the end to be pointed (see Figure 10b ). When grinding (see Figure 7 ) made a tapered tip on each bristle, which has a length l. This length l is predetermined by the design. The tufts of bristles 12 are now adjusted so that the free end to be machined projects correspondingly far from the holder in order to achieve a ratio L / I greater than or equal to 3, in particular greater than or equal to 4.

Optional kann auch eine Obergrenze vorgesehen sein, nämlich kleiner gleich 7, insbesondere kleiner gleich 6,5.Optionally, an upper limit can also be provided, namely less than or equal to 7, in particular less than or equal to 6.5.

Eine Option besteht darin, dass das Borstenbüschel 12 so eingespannt ist, dass die freie Länge des zu bearbeitenden Endes mindestens 12 mm oder mehr als 40% der Gesamtlänge des ungeschliffenen Borstenbüschels 12 bezogen auf die Halterung beträgt.One option is that the bristle tuft 12 is clamped in such a way that the free length of the end to be machined is at least 12 mm or more than 40% of the total length of the unpolished bristle tuft 12 is based on the holder.

Die Figuren 3 und 4 zeigen den zweiten Schritt aus Figur 1 in einer perspektivischen Ansicht. Die in dem Büschelhalter 18 gehalterten, z.B. eingeklemmten, Borstenbüschel 12 werden über den rotierenden Schleifkörper 22 bewegt, der in dieser Ausführungsform eine Schleifwalze ist, an deren kreiszylindrischer oder konischer Mantelfläche 30 (Schleifoberfläche) der Schleifprozess ausgeführt wird. Während dieser Bewegung rotiert zusätzlich der Büschelhalter 18 um eine Drehachse A, die parallel zur Längsrichtung der eingespannten Borstenbüschel 12 steht. Der Büschelhalter wird längs einer linearen Bahn B, die in Draufsicht parallel ° zur Rotationsachse X der Schleifwalze steht oder mit ihr zusammenfällt. In Seitenansicht, siehe Figur 4, ist jedoch zu erkennen, dass die Bahn B leicht zur Schleifoberfläche, d.h. der Mantelfläche 30 gekippt verläuft, nämlich unter einem Winkel α von 2-10°. Das bedeutet, während des Schleifprozesses und des Verfahrens des Büschelhalters 18 entlang der Schleifoberfläche wird der Büschelhalter 18 und die Borstenbüschel zunehmend in Richtung zur Rotationsachse X oder, mit anderen Worten, zur Mantelfläche 30 zugestellt. Es wird also ein immer größerer axialer Abschnitt der Borsten geschliffen. Da bei der Ausführungsform nach Figur 4 der Schleifkörper eine kreiszylindrische Mantelfläche 30, besitzt, ist der Winkel α auch zwischen der Mantelfläche 30 und der Rotationsachse X vorhanden.The Figures 3 and 4th show the second step out Figure 1 in a perspective view. The bristle tufts 12 held, for example clamped, in the tuft holder 18 are moved over the rotating grinding body 22, which in this embodiment is a grinding roller, on the circular cylindrical or conical lateral surface 30 (grinding surface) of which the grinding process is carried out. During this movement, the tuft holder 18 additionally rotates about an axis of rotation A, which is parallel to the longitudinal direction of the clamped tufts 12. The tuft holder is along a linear path B, which in plan view is parallel to the axis of rotation X of the grinding roller or coincides with it. In side view, see Figure 4 However, it can be seen that the web B runs slightly towards the grinding surface, ie the outer surface 30, namely at an angle α of 2-10 °. This means that during the grinding process and the movement of the tuft holder 18 along the grinding surface, the tuft holder 18 and the bristle tufts are increasingly fed in the direction of the axis of rotation X or, in other words, the lateral surface 30. An ever larger axial section of the bristles is thus ground. Since in the embodiment after Figure 4 the grinding wheel has a circular cylindrical outer surface 30, the angle α is also present between the outer surface 30 and the axis of rotation X.

Der kleinste Abstand a der Halterung im Büschelhalter 18 zur Schleifoberfläche liegt hierbei im Bereich von 5 mm bis 10 mm.The smallest distance a of the holder in the tuft holder 18 from the grinding surface is in the range from 5 mm to 10 mm.

Alternativ oder zusätzlich kann auch der Abstand des Büschelhalters 18 zum Schleifkörper 22 verringert werden, indem der Schleifkörper 22 derart geformt ist, zum Beispiel konisch gemäß Figur 5, dass sich der Abstand zwischen Büschelhalter 18 und der Oberfläche des Schleifkörpers 22 verringert.Alternatively or additionally, the distance between the tuft holder 18 and the grinding body 22 can also be reduced by shaping the grinding body 22 in this way, for example in a conical manner Figure 5 that the distance between the tuft holder 18 and the surface of the grinding body 22 is reduced.

Das Verhältnis (R/r) vom Radius der Schleifwalze zum Abstand des am weitesten zur Drehachse A des Büschelhalters 18 entfernten, gehaltenen Borstenbüschels 12 von der Drehachse A beträgt in dieser Ausführungsform zwischen 1 und 4, kann aber auch zwischen 1 und 3 betragen.The ratio (R / r) of the radius of the grinding roller to the distance of the bristle tuft 12 held most distant to the axis of rotation A of the tuft holder 18 from the axis of rotation A in this embodiment is between 1 and 4, but can also be between 1 and 3.

Mit Sicht in Richtung der Drehachse A des Büschelhalters 18, liegen zusätzlich sämtliche Borstenbüschel 12 des Büschelhalters 18 innerhalb der die Mantelfläche in Draufsicht begrenzenden, linienförmigen Außenränder 40 der Schleifwalze.With a view in the direction of the axis of rotation A of the tuft holder 18, all of the bristle tufts 12 of the tuft holder 18 are additionally located within the linear outer edges 40 of the grinding roller which delimit the lateral surface in plan view.

Bei dieser Ausführungsform ist auch ein Konuswinkel β des Schleifkörpers 22 dargestellt.In this embodiment, a cone angle β of the grinding body 22 is also shown.

Dadurch, dass der Büschelhalter 18 während seiner linearen Bewegung längs der Bahn B von dem Ende des Schleifkörpers 22 mit größerem Durchmesser R zum Ende mit kleinerem Durchmesser verfährt, beginnt der Schleifßprozess an dem Abschnitt des Schleifkörpers 22, an dem die Mantelfläche eine größere Umfangsgeschwindigkeit besitzt als am Ende mit dem kleineren Durchmesser.By moving the tuft holder 18 during its linear movement along the path B from the end of the grinding wheel 22 with a larger diameter R to the end with a smaller diameter, the grinding process begins at the section of the grinding wheel 22 at which the lateral surface has a greater peripheral speed than in the end with the smaller diameter.

Wie in Figur 5 gut zu sehen ist, werden zuerst nur die Enden der Borsten geschliffen, wobei dieser Schleifprozess mit hoher Schleifgeschwindigkeit vollzogen wird. Anschließend wird der Abstand des Büschelhalters 18 zur Schleifoberfläche immer geringer, d.h. die Borstenbüschel werden zunehmend zur Schleifoberfläche zugestellt. Gleichzeitig reduziert sich jedoch die Umfangsgeschwindigkeit des Schleifkörpers 22. Damit nimmt die durch Reibung in die Borsten eingetragene Wärmemenge ab.As in Figure 5 It is easy to see that only the ends of the bristles are sanded first, whereby this sanding process is carried out at a high sanding speed. Then the distance between the tuft holder 18 and the grinding surface becomes ever smaller, ie the bristle tufts are increasingly fed to the grinding surface. At the same time, however, the peripheral speed of the grinding wheel 22 is reduced. The amount of heat introduced into the bristles by friction decreases.

Die Idee, während des Schleifvorgangs die einzelnen Borsten zunehmend weiter zur Schleifoberfläche zuzustellen, gleichzeitig aber die Schleifgeschwindigkeit zu verringern, lässt sich auch noch auf andere Weise realisieren, wie in Figur 6 dargestellt.The idea of increasingly moving the individual bristles towards the grinding surface during the grinding process, but at the same time reducing the grinding speed, can also be realized in another way, as in Figure 6 shown.

Figur 6 zeigt fünf nebeneinander angeordnete Büschelhalter 18, die zahlreiche Borstenbüschel 12 aufnehmen und um ihre Achsen A rotieren. Im ersten Schritt, der in Figur 6 oben dargestellt ist, ist der Abstand T3 des Büschelhalters 18 zur Rotationsachse R noch relativ groß, sodass nur die axialen Endabschnitte der Borsten geschliffen werden. Die Schleifgeschwindigkeit ist dabei aber relativ hoch, weil der Schleifkörper 22 schnell mit der Drehzahl n1 rotiert. In Schritten oder kontinuierlich werden die Rotationsgeschwindigkeit und die Drehzahl dann von n2 auf n1 reduziert und gleichzeitig der Abstand des Büschelhalters 18 zur Rotationsachse R über T2 auf T1 verringert. Figure 6 FIG. 5 shows five tuft holders 18 arranged side by side, which take up numerous tufts of bristles and rotate about their axes A. In the first step, the in Figure 6 As shown above, the distance T3 of the tuft holder 18 from the axis of rotation R is still relatively large, so that only the axial end sections of the bristles are ground. However, the grinding speed is relatively high because the grinding body 22 rotates quickly at the speed n1. The speed of rotation and the speed of rotation are then reduced in steps or continuously from n2 to n1, and at the same time the distance of the tuft holder 18 from the axis of rotation R is reduced via T1 to T1.

Bei der Ausführungsform nach Figur 6 werden die Büschelhalter 18 nicht längs einer quer zur Drehachse A verlaufenden Bahn B verfahren, sondern nur gedreht und in Richtung ihrer Drehachse A zugestellt, die daher die Bahn B darstellt. Natürlich können auch umgekehrt die Walzen in Richtung Büschelhalter zugestellt werden.In the embodiment according to Figure 6 the tuft holders 18 are not moved along a path B running transverse to the axis of rotation A, but only rotated and delivered in the direction of its axis of rotation A, which therefore represents the path B. Conversely, the rollers can of course also be fed in the direction of the tuft holder.

Figur 7 zeigt, welche unterschiedlichen Abschnitte der späteren, fertigen Borstenspitze mit welchen Drehzahlen und bei welchem Abstand erzeugt wurden. Figure 7 shows which different sections of the later finished bristle tip with which speeds and at what distance were generated.

Figur 8 gibt verschiedene Verläufe von Drehzahländerung zur Abstandsänderung wieder, längs der der Schleifprozess ausgeführt wird. Die Figuren 4 und 5 zeigen bereits einseitig angespitzt Borsten, die am zweiten Ende gespitzt werden. Symbolisch sind dabei die Borstenbüschel spitz zulaufend dargestellt. In Wirklichkeit sehen die Borstenbüschel so aus, wie in der vergrößerten Ansicht in Figur 9, links unten, in der die einzelnen Borsten selbst angespitzt dargestellt sind. Figure 8 shows different courses from speed change to distance change along which the grinding process is carried out. The Figures 4 and 5 already show bristles pointed on one side, which are pointed at the second end. The tufts of bristles are shown symbolically tapering. In reality, the tufts of bristles look like the enlarged view in Figure 9 , bottom left, in which the individual bristles themselves are shown pointed.

In Figur 9 ist der dritte Schritt aus Figur 1 in einer Seitenansicht gezeigt. Der Büschelhalter 18 wird zum Schleifen der anderen Borstenenden 24 um eine Achse, die orthogonal zur Längsrichtung der eingespannten Borstenbüschel 12 steht, um 180° gedreht. Zusätzlich werden die Borstenbüschel 12 innerhalb des Büschelhalters 18 axial verschoben (siehe Pfeil in Figur 9), z. B. mit einem Schieber 20, nachdem der Büschelhalter 18 aus einer halternden, z.B. klemmenden Stellung (Figur 10b) in eine nicht halternden, z.B. nicht klemmende Stellung (Figur 10a) gebracht wurde. Dadurch haben die Borstenbüschel 12 an ihrem noch nicht angespitzten Ende eine freie Länge L von mindestens 12 mm oder mehr als 40% der Gesamtlänge des ungeschliffenen Borstenbüschels 12.In Figure 9 is the third step out Figure 1 shown in a side view. The tuft holder 18 is rotated by 180 ° in order to grind the other bristle ends 24 about an axis which is orthogonal to the longitudinal direction of the clamped bristle tufts 12. In addition, the bristle tufts 12 are axially displaced within the tuft holder 18 (see arrow in Figure 9 ), e.g. B. with a slide 20 after the tuft holder 18 from a holding, for example clamping position ( Figure 10b ) in a non-holding, e.g. non-clamping position ( Figure 10a ) was brought. As a result, the bristle tufts 12 have a free length L of at least 12 mm or more than 40% of the total length of the unpolished bristle tufts 12 at their not yet pointed end.

Allgemeiner ausgedrückt beträgt das Verhältnis L/I der freien Länge L zu der Länge l der zu erzeugenden konisch zulaufenden Spitze größer gleich 3, insbesondere größer gleich 4. Das bedeutet, das entsprechende Verhältnis L/I wird auch beim Schleifen des zweiten Endes des Borstenbüschels 12 eingestellt, sodass die beiden Enden gleiche Spitzenformen und Spitzenlängen an ihren Borsten besitzen.Expressed more generally, the ratio L / I of the free length L to the length l of the tapered tip to be produced is greater than or equal to 3, in particular greater than or equal to 4. This means that the corresponding ratio L / I also becomes when grinding the second end of the bristle tuft 12 set so that the two ends have the same tip shapes and tip lengths on their bristles.

Als Obergrenze kann 6 oder 5 als Verhältnis L/I vorteilhaft sein.As an upper limit, 6 or 5 can be advantageous as the ratio L / I.

Die Figuren 10a und 10b zeigen einen Büschelhalter 18 mit zwei Aufnahmen 28 und jeweils darin angeordneter Halteeinheiten 32, mit deren Hilfe sich die Borstenbüschel 12 über ihre Länge an unterschiedlichen Stellen befestigen lassen sowie ein Verschieben des Borstenbüschels 12 in nicht klemmender Stellung des Büschelhalters 18 relativ zum Büschelhalter 18 möglich ist.The Figures 10a and 10b show a tuft holder 18 with two receptacles 28 and each holding units 32 arranged therein, with the help of which the bristle tufts 12 can be attached over their length at different locations and moving the bristle tuft 12 in the non-clamping position of the tuft holder 18 relative to the tuft holder 18 is possible.

Figur 10a zeigt hierbei die offene Position der Halteeinheit 32, bei der sich zwei plattenartige Druckelemente 34 in einer offenen, voneinander entfernten Position und die dazwischen angeordneten elastischen Elemente 36 in Form von O-Ringen in einer nicht klemmenden Position befinden. Figure 10a shows the open position of the holding unit 32, in which two plate-like pressure elements 34 are in an open, distant position and the elastic elements 36 arranged in between in the form of O-rings are in a non-clamping position.

In Figur 10b ist die geschlossene Position der Halteeinheit 32 gezeigt, bei der sich die beiden Druckelemente 34 in geschlossener, einander angenäherter Position und die dazwischen angeordneten elastischen Elemente 36 in einer klemmenden, gequetschten Position befinden. In dieser Position werden die die Borstenbüschel 12 umgebenden Aufnahmeöffnungen durch Kompression der elastischen Elemente 36 im Querschnitt reduziert und klemmen so die Borstenbüschel 12 in den Aufnahmen 28.In Figure 10b the closed position of the holding unit 32 is shown, in which the two pressure elements 34 are in a closed, approximated position and the elastic elements 36 arranged between them are in a clamping, squeezed position. In this position, the receiving openings surrounding the bristle tufts 12 are reduced in cross section by compression of the elastic elements 36 and thus clamp the bristle tufts 12 in the receptacles 28.

Es ist nicht zwingend erforderlich, dass zur Durchführung des erfindungsgemäßen Verfahrens die Borstenbüschel im Büschelhalter längst verschoben werden müssen, d.h. umgespannt werden müssen, wenn das andere Ende angespitzt werden soll, wie dies in den Figuren 9 und 10 dargestellt ist. Es ist auch möglich, beide Enden in derselben Aufspannung zu schleifen.It is not absolutely necessary that the bristle tufts in the tuft holder have to be displaced long ago in order to carry out the method according to the invention, that is to say they have to be reclamped if the other end is to be pointed, as is shown in FIGS Figures 9 and 10th is shown. It is also possible to grind both ends in the same setting.

Bei Anwendungen, bei denen Borstenbüschel ungefaltet, das heißt ohne Anker, im Bürstenkörper gehalten werden, muss nur ein Ende der Borsten angespitzt werden. Da diese Borsten jedoch extrem kurz sind, können sie ohne Zuschnitt nicht mechanisch angespitzt werden. Die Lösung dieses Problems besteht darin, dass man überlange Borsten verwendet, diese an beiden Enden wie zuvor beschrieben angespitzt und danach mittig durchtrennt.In applications in which tufts of bristles are held in the brush body unfolded, that is to say without an anchor, only one end of the bristles has to be pointed. However, since these bristles are extremely short, they cannot be sharpened mechanically without being cut. The solution to this problem is to use long bristles, sharpen them at both ends as described above and then cut them in the middle.

Claims (14)

  1. A method for mechanically pointing bristles for brushes, in particular toothbrushes, by grinding, comprising the following steps:
    a) holding bristle tufts (12) in a tuft holder (18) such that the ratio (L/I) of the free length (L) of the bristle tuft, as measured from the fixture to the free end to be pointed, to the length (I) of the conical bristle tip to be produced is greater than or equal to 3, and
    b) grinding the bristle ends (24) at the first free end,
    characterized in that one or more grinding rollers are used for grinding which have a circular cylindrical or conical shell surface (30) on which the grinding process is carried out,
    the tuft holder (18) rotating about an axis of rotation (A) during grinding,
    the axis of rotation (A) being parallel to the longitudinal direction of the clamped bristle tuft (12) and at an angle (α) of at least 80° with respect to the axis of rotation (X) of the grinding roller,
    and the ratio (R/r) of the radius of the grinding roller (R) to the distance (r) of the held bristle tuft (12) furthest away from the axis of rotation (A) of the tuft holder (18) from the axis of rotation (A) being between 1 and 4.
  2. The method according to claim 1, characterized in that the ratio (L/I) is greater than or equal to 4 and/or in that the ratio (L/I) is less than or equal to 7, in particular less than or equal to 6.5.
  3. The method according to claim 1 or 2, characterized in that subsequent to step b), the method comprises the following further steps:
    c) changing the position of the bristle tuft (12) in the tuft holder (18) so that for the second free end, not yet ground, the same ratio (L/I) is set as was set for pointing the already pointed end, and
    d) grinding the bristle ends (24) at the second free end.
  4. The method according to any of the preceding claims, characterized in that in step b) the free length (L) of the bristle tufts (12), as measured from the fixture to the free first end to be pointed, is at least 12 mm and/or more than 40% of the total length of the unground bristle tuft (12).
  5. The method according to claim 4, characterized in that subsequent to step b), the method comprises the following further steps:
    e) changing the position of the bristle tuft (12) in the tuft holder (18), so that the free length (L) of the bristle tufts (12) from the fixture to the free, opposite end of the bristle tuft (12) is at least 12 mm and/or more than 40% of the total length of the unground bristle tuft (12); and
    f) grinding the bristle ends (24) at the second free end.
  6. The method according to claim 3 or 5, characterized in that after step b) and before step d), the tuft holder (18) is rotated by 180° about an axis that is orthogonal to the longitudinal direction of the clamped bristle tuft (12).
  7. A method, in particular according to any of the preceding claims, for mechanically pointing bristles for brushes, in particular toothbrushes, by grinding bristle tufts on a grinding surface of a rotating tool, characterized in that during the grinding process the bristle tufts (12) are increasingly fed in the direction of the tool-side grinding surface and in the process the relative speed between the grinding surface and the bristle tufts (12) is increasingly reduced.
  8. The method according to any of the preceding claims, characterized in that the direction of travel of the tuft holder (18) is not parallel to the axis of rotation (X) of the grinding roller and/or in that the distance (a) of the tuft holder (18) to the shell surface (30) is increasingly reduced during the traveling.
  9. The method according to any of the preceding claims, characterized in that one or more grinding rollers are used for grinding which have a shell surface (30) on which the grinding process is carried out, and in that with a view in the direction of the axis of rotation (A) of the tuft holder (18), all bristle tufts (12) of the tuft holder (18) are located within outer edges of the grinding roller that define the shell surface.
  10. A grinding device (10) for mechanically pointing bristles for brushes, in particular toothbrushes, comprising at least one tuft holder (18) with at least one receptacle (28) for a bristle tuft (12) and at least one abrasive body (22) with a grinding surface, the tuft holder (18) being configured with a holding unit (32) which, in a closed position, allows a holding, in particular clamping, of the at least one bristle tuft (12) at different points of the bristle tuft (12) along the length thereof and, in an open position, allows a shifting of the bristle tuft (12) in a non-holding, in particular non-clamping, position of the tuft holder (18) relative to the tuft holder (18), characterized in that the abrasive body (22) is a grinding roller with a shell surface (30) that is configured as a grinding surface and has a circular cylindrical or conical shape, the tuft holder (18) rotating about an axis of rotation (A) during grinding, the axis of rotation (A) being parallel to the longitudinal direction of the clamped bristle tuft (12) and at an angle (α) of at least 80° with respect to the axis of rotation (X) of the grinding roller, and the ratio (R/r) of the radius of the grinding roller (R) to the distance (r) of the held bristle tuft (12) furthest away from the axis of rotation (A) of the tuft holder (18) from the axis of rotation (A) being between 1 and 4.
  11. The grinding device (10) according to claim 10, characterized in that the free length (L) of the bristle tufts (12) from the fixture to the free first end to be pointed is at least 12 mm and/or more than 40% of the total length of the unground bristle tuft (12).
  12. The grinding device (10) according to claim 10 or 11, characterized in that the holding unit (32) comprises pressure elements (34) and at least one elastic element (36) arranged between the pressure elements (34), wherein the elastic element (36) surrounds a receiving opening for the bristle tuft (12) and can reduce the cross-section of the receiving opening by a compression of the elastic element (36) in order to hold or clamp the bristle tuft (12) in the receptacle (28).
  13. The grinding device (10) according to any of claims 10 to 12, characterized in that for pointing both opposite bristle ends (24), the tuft holder (18) can be rotated by 180° about an axis that is orthogonal to the longitudinal direction of the clamped bristle tuft (12).
  14. The grinding device (10) according to any of claims 10 to 13, characterized in that the tuft holder (18) is mounted to be movable along the shell surface (30) substantially in the longitudinal direction.
EP16785450.4A 2015-11-06 2016-10-21 Method for mechanically sharpening bristles and grinding device Active EP3370571B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
BE2015/5725A BE1023106B1 (en) 2015-11-06 2015-11-06 Method for mechanical sharpening of bristles and grinding device
PCT/EP2016/075334 WO2017076660A1 (en) 2015-11-06 2016-10-21 Method for mechanically sharpening bristles and grinding device

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EP16785450.4A Active EP3370571B1 (en) 2015-11-06 2016-10-21 Method for mechanically sharpening bristles and grinding device

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JP (1) JP6853827B2 (en)
KR (1) KR102598742B1 (en)
CN (1) CN108430265B (en)
BE (1) BE1023106B1 (en)
ES (1) ES2813554T3 (en)
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WO (1) WO2017076660A1 (en)

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DE102018114031A1 (en) * 2017-09-20 2019-03-21 Zahoransky Ag Method and device for processing screwed-in brushes
CN110584316B (en) * 2019-09-26 2024-05-10 孙奇勋 Multifunctional assembly equipment for general straight brush wire, corrugated wire mixed blending and sharpening
DE102020108452A1 (en) * 2020-03-26 2021-09-30 Gb Boucherie Nv Bristle processing device
CN113618578B (en) * 2021-08-17 2022-10-04 安徽友川刷业有限公司 Full-automatic bristle disc bristle grinding device

Citations (1)

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Publication number Priority date Publication date Assignee Title
EP0346646A2 (en) * 1988-06-15 1989-12-20 CORONET-Werke Gesellschaft mit beschränkter Haftung Method and apparatus for manufacturing brush ware

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BE442233A (en) * 1950-01-11
US4037818A (en) * 1975-08-26 1977-07-26 International Telephone And Telegraph Corporation Control valve
DE4006325A1 (en) * 1990-03-01 1991-09-05 Schlerf Coronet Werke Brush bristle active end processing - clamps bristle tufts at distance from active end, cuts them to size, and grinds active ends
JPH0975136A (en) * 1995-09-14 1997-03-25 Akada Hake Kogyo Kk Cleaning brush and its manufacture
JP2824238B2 (en) * 1996-07-01 1998-11-11 花王株式会社 Brush tip grinding method and apparatus
BE1013968A3 (en) * 2001-02-13 2003-01-14 Boucherie Nv G B Method for manufacturing of brushes and device for cutting of fibre brush this is used.
DE102006030413B4 (en) * 2006-06-29 2016-05-12 Zahoransky Ag Method and apparatus for making brushes
CN204306288U (en) * 2014-11-06 2015-05-06 桐乡市高桥兴伟制刷机械厂 A kind of hairbrush sanding mechanism

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0346646A2 (en) * 1988-06-15 1989-12-20 CORONET-Werke Gesellschaft mit beschränkter Haftung Method and apparatus for manufacturing brush ware

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WO2017076660A1 (en) 2017-05-11
ES2813554T3 (en) 2021-03-24
TW201729722A (en) 2017-09-01
KR20180081098A (en) 2018-07-13
CN108430265B (en) 2021-03-23
JP2018532539A (en) 2018-11-08
BE1023106B1 (en) 2016-11-23
TWI698197B (en) 2020-07-11
CN108430265A (en) 2018-08-21
EP3370571A1 (en) 2018-09-12
JP6853827B2 (en) 2021-03-31
KR102598742B1 (en) 2023-11-03

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