EP0482475B1 - Lap detacher - Google Patents

Description

The invention relates to a method for releasing a cotton wool beginning from a cotton wadding, or to a device for carrying out the method.

When tracking or starting a new wadding roll on a combing machine or on a wadding sweep line, the new wadding is removed by hand after placing a new wrap on a holder for unrolling the wadding and manually applied to the end of the wadding.

From DE-AS-1283718, however, a device can be found, a new reserve winding being kept ready and the new wadding beginning being automatically updated.

Two solutions are proposed to replace the new wadding. In the first solution, the new wadding is detached by means of a sieve drum that is under pressure inside and placed downwards in the nip of two conveyor rollers for attachment to the wadding end that is running out.

In the second solution, the new wadding is blown off by means of a nozzle which acts counter to the unwinding direction of the roll and is placed on the wadding end which is running out. The blowing process, or the loosening of the new wadding end, is monitored by a sensor.

The solution with the sieve drum is relatively complex and expensive and carries the risk of contamination of the sieve drum during continuous operation due to fiber fly and other components. The delivery of the new beginning of cotton, which has been detached from the screening drum, to the subsequent conveyor rollers can lead to problems, especially the new one The wadding on a part of the discharge path hangs freely down on the conveyor rollers and is not guided. As a result, the tips of the new wadding start can fold over and there can be mass accumulations in the area of the attachment point with the wiping end of the wadding. This turning over of the tips of the new wadding can occur when uncontrolled air flows occur in the area of the dispensing.

When blowing off the beginning of the cotton wool, an unwanted flipping of the tips can also occur. In addition, it is difficult to achieve a desired coverage when starting with this device.

From JP-A-1-292121 a device for removing the wadding is known, the wadding beginning being sucked off by means of a suction tube which can be fed to the winding and brought into overlap with an outgoing wadding end. This system normally ensures a safe removal of the new wadding from the wrap. However, as soon as the front edge of the new wadding beginning lies transversely to the longitudinal axis of the suction tube on the wrap, it can happen that only part of the wadding beginning is seen across the width of the wrap and is pulled off.

It is therefore an object of the invention to improve the known methods and the devices for detaching a new wadding start of a wadding roll to ensure a simple and safe detachment of the wadding beginning from the wrap using a simple and safe detaching device. At the same time, the device or the method is intended to ensure a safe transfer to a subsequent attachment point to the cotton that is running out.

This object is achieved in that over at least the wadding width and at a distance from the periphery of the An approximately tangential and in the unwinding direction to the cotton roll leading air flow is generated.

The subsequent guidance after detachment in a predetermined position ensures the safe transfer to the subsequent attachment point.

The formation of the air flow in the form of air flowing in a flat surface creates a constant negative pressure area over the entire width of the roll, since the air jet generated mixes with the environment and entrains considerable amounts of air in the direction of the jet (see also pocket book DUBBEL - "Properties of the free jet "), which creates an air flow along the wrap, which guarantees a safe detachment of the entire new wadding.

The detachment can take place by rotating the wadding roll, whereby the wadding beginning at the wad comes into the area of the air flow or by corresponding stationary feeding of the wadding wadding, whereby the wadding beginning at the wrap is positioned in the area of the air flow.

The further proposed possibility of changing the air speed ensures an optimal setting according to the respective work step. To carry out the method, it is proposed that a nozzle with one or more air outlet openings oriented approximately tangentially and in the unwinding direction to the cotton wadding be arranged over at least the wadding width and at a distance from the periphery of the cotton wadding. Here, the expression tangential is not to be understood in a restrictive manner, precisely to the tangent to the outer circumference of the winding, but rather in an angular range which includes the tangent and is at least not directed against the unwinding direction.

The outlet openings for the air jet from the nozzle can be designed both as a continuous slot projecting beyond the width of the wadding or as bores which are arranged next to one another at a distance. The further proposed guide surface in the extension of the air outlet openings of the nozzle ensures a safe transfer to the subsequent attachment point.

The further proposed geometric arrangement of the air outlet openings in relation to the periphery of the wadding roll and the nozzle in the detaching position ensures that, due to the prevailing air currents and the resulting negative pressure areas, the wadding start is safely released from the roll after passing through the nozzle.

The movable attachment of the nozzle enables a simple and safe transfer of the removed cotton wool start to a subsequent attachment point to an emerging cotton wool end.

For better coordination of the removal or attachment process of the new wadding beginning, it is further proposed that the air speed of the air jet generated by the nozzle is designed to be changeable during the removal or attachment process. It is advantageously proposed to apply a high air velocity during the removal and, after the removal operation has taken place, a lower air velocity of the air jet via the nozzle. The attachment of side guides to the guide surface restricts the lateral spread of the air jet and ensures that the removed wadding begins to retain its width and does not break out laterally.

Further advantages of the invention are described and shown in more detail with reference to the following exemplary embodiment.

Fig. 1

eine schematische Seitenansicht einer Abroll- und Abnahmevorrichtung für einen Wickel einer Kämmaschine

Fig. 2

eine vergrösserte Seitenansicht der Abnahmevorrichtung für das Wattenende nach Fig. 1

Fig. 3

eine verkleinerte Teilansicht nach Fig. 1 - Aufbereiten des Wattenendes

Fig. 4

eine verkleinerte Teilansicht nach Fig. 1 - Anlegen des aufbereiteten Wattenendes

Fig. 5

eine verkleinerte Teilansicht nach Fig. 1 - Ablösen des angelegten und aufbereiteten Wattenendes

Fig. 6

eine verkleinerte Teilansicht nach Fig. 1 - Ansetzen des neuen Wattenendes an das auslaufende Wattenende

Fig. 7

eine verkleinerte Teilansicht nach Fig. 1 - Abrollen des neu angesetzten Wickels zum Auskämmen

Fig. 8

eine perspektivische Ansicht nach Fig. 1.

Fig. 9

eine weitere Ausführungsform der Düse entsprechend der Fig. 2

Show it:

Fig. 1

is a schematic side view of a roll and take-off device for a winding of a combing machine

Fig. 2

2 shows an enlarged side view of the removal device for the cotton end according to FIG. 1

Fig. 3

a reduced partial view of FIG. 1 - preparation of the wadding end

Fig. 4

a reduced partial view of FIG. 1 - putting on the prepared cotton end

Fig. 5

a reduced partial view of FIG. 1 - detaching the applied and prepared cotton end

Fig. 6

a reduced partial view of FIG. 1 - attaching the new wadding end to the emerging wadding end

Fig. 7

a reduced partial view of FIG. 1 - unrolling the newly applied reel for combing

Fig. 8

2 shows a perspective view according to FIG. 1.

Fig. 9

a further embodiment of the nozzle according to FIG. 2nd

Fig. 1 shows a winding holder 1, which is provided with a front winding roller 2 and a rear winding roller 3 for receiving the wadding roll 4. The wadding roll 4 consists of a wadding 5, which was wound onto a sleeve 6 in a special process. As indicated schematically, the winding rollers 2, 3 are coupled to a drive 7. In the area of the front winding roller 2 there is a detaching device 8 for detaching the beginning of the wadding 9. The detaching device 8 consists of a tubular nozzle 10 which extends at least over the width of the roll 4 and which is arranged so as to be pivotable about the axis of rotation 13 of the front winding roll 2 via pivot arms 11, 12 attached at both ends. The nozzle 10 has an air outlet slot 16 which, in the solid position of the detachment device shown in FIG. 1, points in the tangential direction and in the unwinding direction A of the roll 4. The air outlet slot 16 also extends continuously over the width of the roll 4. Instead of the slot 16, a large number of bores made next to one another could also be present.

Below the air outlet slot 16, a guide plate 17 is attached to the nozzle 10, which also extends over the width of the cotton roll 4. The guide plate 17 is provided with lateral guides 53 on its narrow sides for lateral guidance of the wadding beginning 9 or the air flow S. Within the tubular nozzle 10, a distributor pipe 18 is attached with outlet openings 19 provided on its circumference. This can be seen in particular from FIG. 2. The distributor pipe 18 serves to supply compressed air and is closed at one end and connected to a compressed air line 20 at the other end. The compressed air line 20 is flexibly attached, so that it can also be moved when the detaching device 8 is pivoted. A uniform pressure distribution in the area of the outlet slot 16 is ensured by the supply of the compressed air via the openings 19 provided on the circumference of the distributor pipe 18.

As can be seen from FIG. 2, the two swivel arms 11, 12 of the nozzle 10 are connected via a plate 14, which at the same time forms a guide surface for the rolling cotton wool.

The nozzle 10 is closed on its lateral end faces, so that the compressed air supplied via the compressed air line 20 can only emerge at the air outlet slot 16.

The pivoting movement of the detachment device into the dash-dotted lower layer shown in FIG. 1 is carried out by a cylinder 22 articulated on a schematically indicated frame 21. The winding rollers 2, 3 and the other elements listed are also mounted on this frame 21. In the position shown in FIG. 1, the start of winding 9 is already in a detachment position and is released to an attachment point 23 by pivoting the detachment device 8 into the lower position shown in broken lines.

The attachment point 23 consists of a lower roller 24 and an upwardly displaceable pressure roller 25. As can be seen from FIG. 1, between the roller 24 and the pressure roller 25 there is a wadding end 26 of the outgoing wadding 27 which protrudes backwards and downwards a combing device 28 is supplied. The cotton wool 27 is guided over a guide plate 31 and fed to a pair of tongs 33 via a feed cylinder 32. Arranged below the pliers 33 is a rotating circular comb 34 which combs out the fiber beard which projects in a known manner in the clamping position of the pliers. The combed-out fiber beard is drawn off the cotton wool 27 by means of subsequent tear-off cylinders 35 and passes through a correspondingly supplied fixed comb 36 during the tear-off process.

The lower roller 24 of the attachment point, the feed cylinder 32, the circular comb 34 and the tear-off cylinder 35 are connected to a schematically indicated drive 37. The drive unit 37 is also responsible for the movement of the pliers unit 33. For reasons of clarity, however, the illustration has been omitted.

For exact control of the time of detachment of the cotton wool beginning 9, the control 29 of the compressed air source 30 for supplying the nozzle 10 with compressed air to generate the air flow S, the control of the drive 7 of the winding rollers 2, 3 and the control of the compressed air source 47 of the cylinder 22 for the pivoting of the nozzle 10 is connected to one another in a central control unit 52.

Instead of the combing device 28 shown, a sweeping device for the cotton wool could also be arranged in a cotton wool sweeping section when using this attachment device.

Between the two winding rollers 2, 3 and below the wadding roll 4, a preparation device 40 for the wadding end 9 is pivotably attached to the frame 21 via swivel arms 38, 39. The preparation device 40 here consists of a suction channel 41 and a clamping part 42 which is pivotally attached to the entrance of the suction channel. The clamping part 42 can be pivoted about a flexible collar 44 via a cylinder 43. In the clamping position, the clamping part 42 rests on the opposite wall part 45 of the suction channel 41. A sensor 48 for detecting the beginning of the wadding is located below the clamping point. The suction channel 41, which is otherwise closed on all sides except for the suction opening 49, has an opening on one of its end faces, to which a suction pipe 50 is flexibly connected.

3 - 7 with reference to FIGS. 1 and 2 in detail, the detaching process of the wadding beginning 9 and the feed to a fitting point 23 are described in more detail below:

Fig. 3 shows a position, with a new wadding 4 already on the winding rollers 2, 3. This wadding 4 was manually or automatically placed on the winding rollers 2, 3 after the empty sleeve of the leaking cotton 27 was removed via an ejection device, not shown, or manually. Such an ejection device could, for example, be designed in accordance with the design according to JP-AS 63-27449. The running out of the old roll is monitored by a sensor 51, which then responds as soon as the contrast changes from the white running out cotton wool to the black surface of the sleeve 6. After the sensor 51 has signaled that the old wadding roll has run out, a device (not shown here in greater detail) is put into operation, which prepares the running out wadding end 26 for a subsequent attachment process with a new wadding start. This means that a part of the tapering cotton end 26 is removed or torn off via the device, not shown, in order to obtain a uniform tear-off edge of the tapering cotton end 26, as seen across the width of the cotton taper 27. Such a device can be found in the earlier British patent application with the application number 9009939.1 from May 2, 1990 of Maschinenfabrik Rieter AG.

After the sleeve of the old lap has been ejected and the lap end 26 of the emerging lap 27 has been prepared, the lap 27 is transferred to the position shown in FIG. 3, the lap end 26 being clamped over the attachment point 23 and in the direction of the new lap 4 given piece protrudes. 3 is controlled by sensors (not shown) and has already been addressed in the earlier British patent application cited. The further transport of the outgoing cotton wool 27 to the subsequent processing unit is now interrupted, ie the cotton wool end 26 protruding rearward from the attachment point 23 assumes a waiting position for the application of a new cotton wool start 9. The new wadding roll 4 already put on in FIG. 3 is rotated clockwise by the driven winding rolls 2, 3, whereby the not yet prepared winding start reaches the area of the preparation device 40 or the suction channel 41.

The negative pressure generated during the rotational movement of the winding 4 in the suction channel 41 has the effect that the beginning of the winding of the new winding 4 is drawn into the channel 41 when it reaches the area of the suction opening 49. A sensor 48 installed in the suction channel 41 detects the pulling in of the start of the winding into the suction channel 41. As soon as the sensor 48 triggers the signal "cotton wool present", the clamping part 42 is actuated via the cylinder 43 and clamps the unprepared cotton wool beginning of the cotton roll 4 to it Wall part 45 of the suction channel 41 fixed.

Now, as shown in FIG. 4, the drive of the winding rollers 2, 3 is reversed, as a result of which the winding 4 rotates counterclockwise. The winding 4 is now rotated through a predetermined angle of rotation, as a result of which the new wadding beginning held in place by the clamping part 42 is separated and a new and prepared wadding beginning 9 is thereby formed. The rotational movement of the winding 4 counterclockwise is at least to the extent that the new wadding beginning 9 is pressed against the outer periphery P of the winding 4 via the winding roller 3, so that this does not move automatically from the winding 4 when the direction of rotation is reversed on the way to the front winding roller 2 solves. As can also be seen from FIG. 4, the suction channel 41 can be pivoted into a lower position shown in dash-dotted lines in order to tear off the unprepared cotton end.

With a corresponding geometric attachment of the suction channel 41 to the winding roller 3, pivoting of the channel 41 for tearing off could be dispensed with, ie the opposite rotational movement of the winding 4 may already be sufficient for tearing off.

After this tear-off process, the torn end of the wadding is sucked off via the suction tube 50 after opening of the clamping part 42 and, after the suction device has been stopped, the direction of rotation of the winding 4 or the drive of the winding rollers 2, 3 is reversed again.

On the basis of the predetermined angle of rotation of the roll 4 during the tear-off process for preparing the new wadding beginning 9, its position on the circumference of the roll 4 is precisely defined. This means that the system knows when the new wadding 9 comes into the area of the detaching device 8.

As can be seen from FIG. 5, the winding 4 rotates again clockwise, as a result of which the newly prepared cotton wool beginning 9 reaches the area of the detaching device 8. As soon as the beginning of the cotton wool 9 has passed the point of contact of the front winding roller 2, the nozzle 10 of the detaching device 8 is pivoted from a lower position shown in broken lines to an upper position via a cylinder 2. After reaching this upper position, the nozzle 10 is supplied with compressed air from the compressed air source 30 via the compressed air line 20 and via the distributor pipe 18 and its outlet openings 19. This compressed air now emerges at the air outlet slot 16 and generates an air flow S along the guide plate 17. The air pressure in the distributor pipe 18 is of the order of 6 bar.

The compressed air is then switched on when the front end of the wadding 9 has passed the air outlet slot 16 of the tubular nozzle 10 with the detaching device 8 pivoted up and is at a certain distance from the latter. This process is precisely controlled by the control unit 52. The exact time of the compressed air supply is decisive for the gentle removal of the cotton wool beginning 9. If the compressed air supply is too early, ie if If, for example, the front edge of the cotton wool beginning 9 is at the level of the outlet opening 16, the previously prepared cotton wool beginning can be changed negatively by the air currents which arise, and its tips can also fold backwards. If the compressed air supply is too late, there is a risk that the wadding start 9 will no longer be detached from the winding 4.

The air flow S applied along the guide plate 17 creates a vacuum space U and, due to the entrained ambient air between the periphery P of the roll and the guide plate 17, an air flow along the roll 4 (against its unwinding direction), as a result of which the wadding 9 detaches from the roll 4 and based on the existing pressure conditions due to the air flow S on the guide plate 17. Between the guide surface of the guide plate 17 and the cotton wool, an interface layer of not precisely defined air speed is formed due to the friction between the air jet and the guide surface. The cotton "floats" on this boundary layer so that there is practically no friction between the cotton and the guide surface.

As soon as the wadding 9 is detached from the roll 4 and rests on the guide surface 17, the nozzle 10 is pivoted downward by means of the cylinder 22 via the swivel arms 11, 12. During this pivoting movement, the pressure roller 25 of the attachment point 23 is lifted off the lower roller 24.

As the winding 4 continues to rotate, the front edge of the wadding start 9 is displaced along the guide plate 17 to the end thereof. The immediate swiveling of the nozzle 10 after loosening the wadding beginning 9 is therefore important to prevent the front edge of the wadding beginning 9 due to the between the end region of the guide surface 17 and the periphery P des Wind up 4 arising turbulence and possibly folded back.

As can be seen from FIG. 6, the wadding end 9 is transferred between the nip point of the roller 24 and the raised printing roller 25 and at the same time is placed on the wiping end 26 of the wadding.

In order not to disrupt this attachment process, after the wadding end 9 has been detached from the wrap 4, the amount of pressure of the applied compressed air can be reduced. As soon as the cotton end 9 has reached the position shown in FIG. 6, the pressure roller 25 is lowered again, as a result of which the new cotton end 9 connects to the outgoing cotton end 26.

After lowering the platen 25, as shown in Fig. 7, the subsequent wad processing device, e.g. Combing device 28, including the cotton feed device 32 started again and the supply of compressed air in the nozzle 10 interrupted.

The cotton is now continuously fed back to the subsequent cotton processing device via the guide plate 31.

FIG. 8 shows a perspective illustration of FIG. 1, with the illustration of all parts which are shown in FIG. 1 being omitted for reasons of clarity. The suction device 50 or the compressed air line 20 could also be attached on both sides. Correspondingly, the cylinders 22 and 46 could also be attached to the opposite swivel arms 12 and 39, respectively. 8 shows in particular that the detaching device 8 or the nozzle 10 extends over the entire width B of the roll 4.

FIG. 9 shows a further variant of the nozzle 10 corresponding to the representation according to FIG. 2. The nozzle is designed as a square tube and the air outlet slot 16 is located between the guide plate 17 and a guide rod 54 with a corresponding cross section, which is fixed on the guide plate 17 is attached. The guide plate 17 and the nozzle 10 are provided with slots 55 which together form a passage to the air outlet slot 16 for supplying the compressed air. The mode of operation corresponds to that already listed under FIG. 2.

With this proposed device for removing a wadding end of a new lap, it is possible to ensure automatic and functionally reliable tracking of a new wadding lap in continuous operation.

Claims (16)

1. A method for loosening the initial part of a lap (9) from a lap roll (4), characterized in that an air stream (S) which is approximately tangential and which leads in the direction of unwinding to the lap roll (4) is generated over at least the width of the lap (B) and at a distance from the periphery (P) of the lap roll (4).
2. A method as claimed in claim 1, characterized in that the loosened initial part of the lap (9) is guided to a predefined position and transferred to a subsequent receiving means (23).
3. A method as claimed in claim 1 or 2, characterized in that the air stream (S) is formed from air flowing on a plane surface.
4. A method as claimed in one of the claims 1 to 3, characterized in that the air speed of the air stream (S) is changeable.
5. A method as claimed in claim 5, characterized in that the air speed of the air stream (S) is reduced after the loosening of the initial part of the lap (9).
6. An apparatus for loosening the inital part of a lap (9) from a lap roll (4), characterized in that a nozzle (10) provided with one or several air outlet openings (16) which are approx. tangential and directed in the unwinding direction (A) towards the lap roll (4) is arranged over at least the width of the lap (B) and at a distance to the periphery (P) of the lap roll.
7. An apparatus as claimed in claim 6, characterized in that the outlet opening is arranged as an air outlet slot (16) projecting over at least the width of the lap (B).
8. An apparatus as claimed in claim 6, characterized in that the air outlet openings are bores which are arranged in the nozzle over at least the width of the lap (B) at a small distance from one another.
9. An apparatus as claimed in one of the claims 6 to 8, characterized in that the nozzle (10) is provided with a guide surface (17) in the extension of the air outlet openings (16).
10. An apparatus as claimed in claim 9, characterized in that the air guide surface (17) is attached on the nozzle approx. parallel to the air stream (S) ejecting from the air outlet openings (16), this being made in such a way that the air stream (S) is situated between the periphery (P) of the lap roll (4) and the guide surface (17).
11. An apparatus as claimed in one of the claims 6 to 10, characterized in that with reference to the periphery (P) of the lap roll (4) in the loosening position the distance (X) of the air outlet openings (16) is larger than the smallest distance (Y) of the nozzle (10).
12. An apparatus as claimed in one of the claims 6 to 11, characterized in that the nozzle (10) is attached movably.
13. An apparatus as claimed in claim 12, characterized in that the nozzle (10) is swivellably attached through swivelling arms (11, 12).
14. An apparatus as claimed in claim 13, characterized in that the lap roll (4) is carried through two take-up rollers (2, 3) and that the swivelling arms (11, 12) of the nozzle (10) are held on the axle (13) of the front take-up roller (2).
15. An apparatus as claimed in one of the claims 9 to 14, characterized in that the guide surface (17) is provided in the zone of its narrow sides with lateral guiding means (53) which show towards the periphery (P) of the lap roll (4).
16. An apparatus as claimed in one of the claims 6 to 15, characterized in that at least the control unit (29) of a source of compressed air (30) for generating the air stream (S), the drive (7) of the take-up rollers (2, 3) which make the lap roll (4) rotate for the purpose of unwinding and an adjusting device (22) for swivelling the nozzle (10) are connected to one another with respect to their control.

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