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EP0263359B1 - Cross cutter - Google Patents

Cross cutter Download PDF

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Publication number
EP0263359B1
EP0263359B1 EP87113899A EP87113899A EP0263359B1 EP 0263359 B1 EP0263359 B1 EP 0263359B1 EP 87113899 A EP87113899 A EP 87113899A EP 87113899 A EP87113899 A EP 87113899A EP 0263359 B1 EP0263359 B1 EP 0263359B1
Authority
EP
European Patent Office
Prior art keywords
knife
core
cross
knives
shaft
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP87113899A
Other languages
German (de)
French (fr)
Other versions
EP0263359A1 (en
Inventor
Walter Pohl
Arthur Dirks
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Peters Maschinenfabrik GmbH
Original Assignee
Peters Maschinenfabrik GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Peters Maschinenfabrik GmbH filed Critical Peters Maschinenfabrik GmbH
Publication of EP0263359A1 publication Critical patent/EP0263359A1/en
Application granted granted Critical
Publication of EP0263359B1 publication Critical patent/EP0263359B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member
    • B26D7/265—Journals, bearings or supports for positioning rollers or cylinders relatively to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/56—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter
    • B26D1/62—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder
    • B26D1/626—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which travels with the work otherwise than in the direction of the cut, i.e. flying cutter and is rotating about an axis parallel to the line of cut, e.g. mounted on a rotary cylinder for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/08—Means for treating work or cutting member to facilitate cutting
    • B26D7/14—Means for treating work or cutting member to facilitate cutting by tensioning the work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/26—Means for mounting or adjusting the cutting member; Means for adjusting the stroke of the cutting member
    • B26D7/2628—Means for adjusting the position of the cutting member
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4766—Orbital motion of cutting blade
    • Y10T83/4795—Rotary tool
    • Y10T83/4824—With means to cause progressive transverse cutting
    • Y10T83/4827—With helical cutter blade
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4766—Orbital motion of cutting blade
    • Y10T83/4795—Rotary tool
    • Y10T83/483—With cooperating rotary cutter or backup
    • Y10T83/4833—Cooperating tool axes adjustable relative to each other
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T83/00—Cutting
    • Y10T83/465—Cutting motion of tool has component in direction of moving work
    • Y10T83/4766—Orbital motion of cutting blade
    • Y10T83/4795—Rotary tool
    • Y10T83/483—With cooperating rotary cutter or backup
    • Y10T83/4836—With radial overlap of the cutting members

Definitions

  • the invention relates to a cross cutter for cutting web-like material, in particular corrugated cardboard, according to the preamble of claim 1.
  • a cross cutter for cutting web-like material, in particular corrugated cardboard, according to the preamble of claim 1.
  • Such a cross cutter is known, for example, from the published patent application DE-A-3523603.
  • Knife shaft pairs are usually used in cross cutters for corrugated cardboard production plants, in which each shaft holds at least one knife with a continuously running cutting edge which is at the same distance from the shaft axis.
  • the knife blade either runs parallel to the shaft axis or it is arranged helically.
  • the helical arrangement has the advantage that during the cutting process in a single Only a short section of the cutting edges is in engagement with one another at a time, which keeps the load on the knives, the knife holder and the shafts low.
  • the cutting edges of the knives describe circles that intersect slightly.
  • the cutting edge of one knife lies in the leading and the other in the trailing area of the knife blade.
  • the circumferential radius of the cutting edge in the trailing area is chosen to be somewhat larger than the radius of the other cutting knife, so that only one touch of the cutting edges takes place during one revolution and after this contact the cutting edges move relatively quickly apart.
  • the knife of at least one shaft is adjustably attached at a number of points. If wear on the knife edges is no longer guaranteed, at least one knife must be readjusted. This process requires an interruption in production and is very time-consuming. In the case of tough material or a certain grammage of the corrugated cardboard or also with moist or coated corrugated cardboard, a not inconsiderable preload between the knives must be set in order to obtain a perfect cut. A larger preload requires high cutting forces. In turn, high cutting forces occur at relatively short intervals readjustment of the knives required, which leads to undesired production interruption. High cutting forces also lead to rapid wear of the knives. Since heavy material to be sliced is not so common, it would be more economical to reset the high preload once the knife has been in service.
  • US-A-3,448,684 describes a cross cutter for cutting web-like material.
  • this cross cutter does not have two knives that touch each other briefly during the cutting process, but only a single knife that interacts with a counter tool made of soft material. If a controllable bending moment is also applied to the ends of the cores of the knife shafts, however, this bending moment is not mentioned in the description of US-A-3,448,684, but is only represented by a figure in dashed lines. This bending moment is generated by the force of springs.
  • the invention is therefore based on the object of providing a cross cutter for cutting web-like material, in particular corrugated cardboard, in which an extension of the service life of the knives is achieved.
  • the shafts or knife bars carrying the knives span a considerable length. It is therefore known to store the cutter bars in a tube-like manner on a fixed core.
  • the fixed core is fixed in the machine frame and increases the bending stiffness required for cutting without increasing the mass moment of inertia of the cutter bar.
  • a bending moment is applied to at least one end of a core, with the aid of a suitable force unit, which can act mechanically, hydraulically, pneumatically or electromechanically.
  • the direction of the force is such that the deflection of the core and thus also the knife shaft results in an increase in the pretension.
  • the bending direction of the core is therefore approximately parallel to the readjustment direction of the knives.
  • the direction of loading of the force unit can be changed to change the bending direction.
  • a force unit acts on both ends of a core as far as possible in order to obtain a uniform deflection.
  • the knives on the knife shafts can be adjusted by means of their adjusting screws so that the usual light cardboard qualities are cut. This means special protection of the knives and thus an increased service life. Should be heavy cardboard with the cross cutter cut, the knives would usually be set hard.
  • the application of a bending moment to the core of the cutter bars pre-bends so that a desired cutter bias is generated.
  • the size of the preload can be made dependent on the quality of the material to be cut. A production interruption is not necessary. Just as quickly as a desired preload can be applied, it can be made to disappear again by eliminating the load from the power unit.
  • the force unit is expediently controlled by a suitable control device, which in turn can also be programmed in order to ensure a corresponding bending stress at the core of the cutter bar when different qualities are obtained.
  • the desired deflection may only need to be a fraction of a millimeter to set a desired prestress.
  • the deflection will naturally be greatest in the middle of the cutter bar. This effect is not disadvantageous, on the contrary, the cutting process is particularly critical in this area, so that a relatively large pre-tension always ensures a perfect cut.
  • Two cores 11, 12 are arranged in a machine frame 10 of a cross cutter. They support with the help of roller bearings 13 and 14 hollow shafts 15, 16.
  • the hollow shafts 15, 16 carry gears 17 and 18 at the ends, so that the hollow shafts 15, 16 are coupled in a rotationally rigid manner.
  • the drive of the gears 17, 18 is not shown.
  • Knives 19, 20 are connected to the hollow shafts 15, 16. For the sake of simplicity, they are shown as knives that run parallel to the shaft axis. Knives with helical shapes are usually attached to cross cutters running cutting edge.
  • the knife 19 of the upper shaft 15 is firmly attached to a holder 21.
  • the lower knife 20 can be adjusted relative to its holder 22 in order to bear against the upper knife 21 when the knife edges touch.
  • the lower core 12 is movably supported in the machine frame 10 by means of self-aligning bearings 23, 24. Its ends protrude to a certain extent on both sides. With the help of a force unit, not shown, pressure can be exerted on both ends, as indicated by the arrows 25. In this way, a bending moment is applied to the core 12 from both sides, the moment arm being denoted by m.
  • the direction of the deflection is indicated by arrow 26 in FIG. 2.
  • the bending direction is approximately parallel to the adjustment knife of the lower knife 20.
  • the corresponding bending is indicated in FIG. 2 by the dashed line 27. Both in Fig. 1 and in Fig. 2, the deflection of the knife shaft 26 is shown greatly exaggerated.
  • the knives 19, 20 lie against one another with an increased pretension when they touch. This pretension depends on the extent of the deflection and this depends on the applied bending force. If a bending moment is applied to both cores 11, 12, the bending force is reduced to half.
  • the application of the bending moment can be accomplished by any suitable force device that is operated pneumatically, hydraulically, mechanically, electromechanically or the like.

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Description

Die Erfindung bezieht sich auf einen Querschneider zum Schneiden von bahnartigem Material, insbesondere Wellpappe, nach dem Oberbegriff des Anspruches 1. Ein solcher Querschneider ist zum Beispiel aus der Offenlegungsschrift DE-A-3523603 bekannt.The invention relates to a cross cutter for cutting web-like material, in particular corrugated cardboard, according to the preamble of claim 1. Such a cross cutter is known, for example, from the published patent application DE-A-3523603.

In Querschneidern für Wellpappenfertigungsanlagen werden üblicherweise Messerwellenpaare verwendet, bei denen jede Welle mindestens ein Messer hält mit einer stetig verlaufenden Schneidkante, die gleichen Abstand von der Wellenachse aufweist. Das Messerblatt verläuft entweder parallel zur Wellenächse oder es ist schraubenlinienförmig angeordnet. Die schraubenlinienförmige Anordnung hat den Vorteil, daß während des Schneidvorgangs in einem einzigen Augenblick immer nur ein kurzer Abschnitt der Schneidkanten miteinander in Eingriff ist, wodurch die Belastung der Messer, der Messerhalterung und der Wellen gering gehalten wird. Die Schneidkanten der Messer beschreiben Kreise, die sich geringfügig schneiden. Die Schneidkante des einen Messers liegt im voreilenden und die andere im nacheilenden Bereich des Messerblatts. Der Umlaufradius der Schneidkante im nacheilenden Bereich wird etwas grösser gewählt als der Radius des anderen Schneidmessers, so daß nur eine einmalige Berührung der Schneidkanten während eines Umlaufs stattfindet und nach dieser Berührung ein relativ rasches Auseinanderbewegen der Schneidkanten erfolgt.Knife shaft pairs are usually used in cross cutters for corrugated cardboard production plants, in which each shaft holds at least one knife with a continuously running cutting edge which is at the same distance from the shaft axis. The knife blade either runs parallel to the shaft axis or it is arranged helically. The helical arrangement has the advantage that during the cutting process in a single Only a short section of the cutting edges is in engagement with one another at a time, which keeps the load on the knives, the knife holder and the shafts low. The cutting edges of the knives describe circles that intersect slightly. The cutting edge of one knife lies in the leading and the other in the trailing area of the knife blade. The circumferential radius of the cutting edge in the trailing area is chosen to be somewhat larger than the radius of the other cutting knife, so that only one touch of the cutting edges takes place during one revolution and after this contact the cutting edges move relatively quickly apart.

Das Messer mindestens einer Welle ist an einer Reihe von Punkten verstellbar befestigt. Ist durch Verschleiß eine Berührung der Messerkanten nicht mehr gewährleistet, muß mindestens ein Messer nachgestellt werden. Dieser Vorgang erfordert eine Produktionsunterbrechung und ist mit einem großen zeitlichen Aufwand verbunden. Bei zäherem Material oder ab einer bestimmten Grammatur der Wellpappe oder auch bei feuchter oder beschichteter Wellpappe muß eine nicht unerhebliche Vorspannung zwischen den Messern eingestellt werden, um einen einwandfreien Schnitt zu erhalten. Eine größere Vorspannung bedingt hohe Schnittkräfte. Hohe Schnittkräfte wiederum machen in relativ kurzen Intervallen ein Nachstellen der Messer erforderlich, was zu unerwünschter Produktionsunterbrechung führt. Hohe Schnittkräfte führen ferner zu einem raschen Verschleiß der Messer. Da schweres Schneidgut nicht so häufig vorkommt, wäre es im Hinblick auf die Standzeit der Messer günstiger, die einmal eingestellte hohe Vorspannung wieder zurückzustellen. Da aber das übliche Einstellen der Messer eine zeitaufwendige und komplizierte Arbeit ist, wird in der Praxis auch bei leichten Qualitäten mit relativ hoher Messervorspannung gefahren. Dies bedeutet hohen Messerverschleiß und geringe Messerlebensdauer, die weniger auf das Material als auf die hohe Vorspannung zurückzuführen sind.The knife of at least one shaft is adjustably attached at a number of points. If wear on the knife edges is no longer guaranteed, at least one knife must be readjusted. This process requires an interruption in production and is very time-consuming. In the case of tough material or a certain grammage of the corrugated cardboard or also with moist or coated corrugated cardboard, a not inconsiderable preload between the knives must be set in order to obtain a perfect cut. A larger preload requires high cutting forces. In turn, high cutting forces occur at relatively short intervals readjustment of the knives required, which leads to undesired production interruption. High cutting forces also lead to rapid wear of the knives. Since heavy material to be sliced is not so common, it would be more economical to reset the high preload once the knife has been in service. However, since the usual setting of the knives is a time-consuming and complicated job, in practice even relatively light qualities are used with a relatively high knife preload. This means high knife wear and a short knife service life, which can be attributed less to the material than to the high preload.

Wie diese Vorspannung erzeugt werden kann ist es aus der obengenannten DE-A-3523603 nicht entnehmbar.How this bias can be generated is not apparent from the above-mentioned DE-A-3523603.

Die Offenlegungsschrift US-A-3,448,684 beschreibt einen Querschneider zum Schneiden von bahnartigem Material. Dieser Querschneider weist jedoch nicht zwei Messer auf, die sich während des Schneidvorgangs kurzzeitig berühren, sondern nur ein einziges Messer, welches mit einem Gegenwerkzeug aus weichem Material zusammenwirkt. Wenn weiter auch ein regelbares Biegemoment an den Enden der Kerne der Messerwellen aufgebracht ist, wird jedoch dieses Biegemoment in der Beschreibung von US-A-3,448,684 nicht erwähnt, sondern nur durch eine Figur in gestrichelten Linien dargestellt. Dieses Biegemoment wird durch die Kraft von Federn erzeugt. Aus der Beschreibung kann nur entnommen werden, dass die Funktion der Feder darin besteht, die Kerne mit genügend Kraft nach unten zu drücken, so dass einerseits ein Kern immer in Kontakt mit dem unteren Teil des Lagers steht und anderseits die Keile immer in Kontakt mit dem Grundgestell bleiben. Somit handelt es sich in US-A-3,448,684 nicht um eine Messervorspannung.US-A-3,448,684 describes a cross cutter for cutting web-like material. However, this cross cutter does not have two knives that touch each other briefly during the cutting process, but only a single knife that interacts with a counter tool made of soft material. If a controllable bending moment is also applied to the ends of the cores of the knife shafts, however, this bending moment is not mentioned in the description of US-A-3,448,684, but is only represented by a figure in dashed lines. This bending moment is generated by the force of springs. From the description it can only be seen that the function of the spring is to press the cores down with sufficient force so that on the one hand a core is always in contact with the lower part of the bearing and on the other hand the wedges are always in contact with the Remain base frame. Thus, US-A-3,448,684 is not a knife bias.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Querschneider zum Schneiden von bahnartigem Material, insbesondere Wellpappe, zu schaffen, bei dem eine Verlängerung der Standzeit der Messer erreicht wird.The invention is therefore based on the object of providing a cross cutter for cutting web-like material, in particular corrugated cardboard, in which an extension of the service life of the knives is achieved.

Diese Aufgabe wird durch die Merkmale des Kennzeichnungsteils des Anspruches 1 gelöst.This object is achieved by the features of the characterizing part of claim 1.

Die die Messer tragenden Wellen oder Messerbalken überspannen eine erhebliche Länge. Es ist daher bekannt, die Messerbalken auf einem feststehenden Kern rohrartig zu lagern. Der feste Kern ist im Maschinengestell befestigt und erhöht die für das Schneiden erforderliche Biegesteifigkeit, ohne das Massenträgheitsmoment des Messerbalkens zu erhöhen.The shafts or knife bars carrying the knives span a considerable length. It is therefore known to store the cutter bars in a tube-like manner on a fixed core. The fixed core is fixed in the machine frame and increases the bending stiffness required for cutting without increasing the mass moment of inertia of the cutter bar.

Beim erfindungsgemäßen Querschneider wird an mindestens einem Ende eines Kerns ein Biegemoment aufgebracht, und zwar mit Hilfe einer geeigneten Krafteinheit, die mechanisch, hydraulisch, pneumatisch oder elektromechanisch wirken kann. Die Kraftrichtung ist derart, daß die Durchbiegung des Kerns und damit auch der Messerwelle eine Erhöhung der Vorspannung zur Folge hat. Die Biegerichtung des Kerns liegt daher annähernd parallel zur Nachstellrichtung der Messer. Bei einer anderen Ausgestaltung der Erfindung kann jedoch die Belastungsricht ung der Krafteinheit zur Änderung der Biegerichtung verändert werden.In the cross cutter according to the invention, a bending moment is applied to at least one end of a core, with the aid of a suitable force unit, which can act mechanically, hydraulically, pneumatically or electromechanically. The direction of the force is such that the deflection of the core and thus also the knife shaft results in an increase in the pretension. The bending direction of the core is therefore approximately parallel to the readjustment direction of the knives. In another embodiment of the invention, however, the direction of loading of the force unit can be changed to change the bending direction.

Beim erfindungsgemäßen Querschneider greift eine Krafteinheit möglichst an beiden Enden eines Kerns an, um eine gleichmäßige Durchbiegung zu erhalten. Naturgemäß besteht auch die Möglichkeit, beide Kerne eines Messerwellenpaares zu verbiegen. Die für eine gewünschte Vorspannung aufzubringende Kraft auf einen Kern kann auf diese Weise halbiert werden.In the cross cutter according to the invention, a force unit acts on both ends of a core as far as possible in order to obtain a uniform deflection. Naturally, it is also possible to bend both cores of a pair of knife shafts. In this way, the force to be applied to a core for a desired prestress can be halved.

Mit der Erfindung wird erreicht, daß die Messer auf den Messerwellen mittels ihrer Einstellschrauben so eingestellt werden können, daß die üblichen leichten Pappenqualitäten geschnitten werden. Dies bedeutet eine besondere Schonung der Messer und damit auch eine erhöhte Lebensdauer. Soll mit dem Querschneider schwere Pappe geschnitten werden, so würden üblicherweise die Messer hart eingestellt werden. Erfindungsgemäß wird durch das Aufbringen eines Biegemoments auf den Kern der Messerbalken so vorgebogen, daß eine gewünschte Messervorspannung erzeugt wird. Die Größe der Vorspannung kann dabei von der Qualität des Schneidgutes abhängig gemacht werden. Eine Produktionsunterbrechung ist nicht erforderlich. Ebenso rasch wie eine gewünschte Vorspannung aufgebracht werden kann, kann sie wieder zum Verschwinden gebracht werden, indem die Belastung durch die Krafteinheit in Fortfall kommt.With the invention it is achieved that the knives on the knife shafts can be adjusted by means of their adjusting screws so that the usual light cardboard qualities are cut. This means special protection of the knives and thus an increased service life. Should be heavy cardboard with the cross cutter cut, the knives would usually be set hard. According to the invention, the application of a bending moment to the core of the cutter bars pre-bends so that a desired cutter bias is generated. The size of the preload can be made dependent on the quality of the material to be cut. A production interruption is not necessary. Just as quickly as a desired preload can be applied, it can be made to disappear again by eliminating the load from the power unit.

Die Krafteinheit wird zweckmäßigerweise von einer geeigneten Steuervorrichtung gesteuert, die ihrerseits auch programmiert sein kann, um beim Anfall verschiedener Qualitäten für eine entsprechende Biegespannung am Kern der Messerbalken zu sorgen.The force unit is expediently controlled by a suitable control device, which in turn can also be programmed in order to ensure a corresponding bending stress at the core of the cutter bar when different qualities are obtained.

Die gewünschte Durchbiegung braucht gegebenenfalls nur Bruchteile eines Millimeters zu betragen, um eine gewünschte Vorspannung einzustellen. Die Durchbiegung wird naturgemäß in der Mitte des Messerbalkens am größten sein. Dieser Effekt ist jedoch nicht nachteilig, im Gegenteil, der Schneidvorgang ist in diesem Bereich besonders kritisch, so daß eine relativ große Vorspannung stets für einem einwandfreien Schnitt sorgt.The desired deflection may only need to be a fraction of a millimeter to set a desired prestress. The deflection will naturally be greatest in the middle of the cutter bar. This effect is not disadvantageous, on the contrary, the cutting process is particularly critical in this area, so that a relatively large pre-tension always ensures a perfect cut.

Die Erfindung wird nachfolgend anhand von Zeichnungen näher erläutert.

Fig. 1
zeigt sehr schematisch in Seitenansicht sowie teilweise im Schnitt einen Querschneider nach der Erfindung.
Fig. 2
zeigt einen Schnitt durch den Querschneider nach Fig. 1 entlang der Linie 2-2.
The invention is explained in more detail below with reference to drawings.
Fig. 1
shows very schematically in side view and partly in section a cross cutter according to the invention.
Fig. 2
shows a section through the cross cutter of FIG. 1 along the line 2-2.

In einem Maschinengestell 10 eines Querschneiders sind zwei Kerne 11, 12 angeordnet. Sie lagern mit Hilfe von Wälzlagern 13 bzw. 14 Hohlwellen 15, 16. Die Hohlwellen 15, 16 tragen an den Enden Zahnräder 17 bzw. 18, so daß die Hohlwellen 15, 16 drehstarr gekoppelt sind. Der Antrieb der Zahnräder 17, 18 ist nicht dargestellt. Mit den Hohlwellen 15, 16 sind Messer 19, 20 verbunden. Sie sind der Einfachheit halber als gerade parallel zur Wellenachse verlaufende Messer dargestellt. Bei Querschneidern werden normalerweise Messer angebracht mit schraubenlinienförmig verlaufender Schneidkante. Wie aus Fig. 2 zu erkennen ist, ist das Messer 19 der oberen Welle 15 fest an einer Halterung 21 angebracht. Das untere Messer 20 kann relativ zu seiner Halterung 22 verstellt werden, um mit Vorspannung gegen das obere Messer 21 anzuliegen, wenn die Messerkanten sich berühren.Two cores 11, 12 are arranged in a machine frame 10 of a cross cutter. They support with the help of roller bearings 13 and 14 hollow shafts 15, 16. The hollow shafts 15, 16 carry gears 17 and 18 at the ends, so that the hollow shafts 15, 16 are coupled in a rotationally rigid manner. The drive of the gears 17, 18 is not shown. Knives 19, 20 are connected to the hollow shafts 15, 16. For the sake of simplicity, they are shown as knives that run parallel to the shaft axis. Knives with helical shapes are usually attached to cross cutters running cutting edge. As can be seen from FIG. 2, the knife 19 of the upper shaft 15 is firmly attached to a holder 21. The lower knife 20 can be adjusted relative to its holder 22 in order to bear against the upper knife 21 when the knife edges touch.

Der untere Kern 12 ist mit Hilfe von Pendellagern 23, 24 beweglich im Maschinengestell 10 gelagert. Seine Enden stehen um ein gewisses Maß an beiden Seiten über. Mit Hilfe einer nicht gezeigten Krafteinheit kann auf beide Enden ein Druck ausgeübt werden, wie durch die Pfeile 25 angedeutet. Auf diese Weise wird ein Biegemoment von beiden Seiten auf den Kern 12 aufgebracht, wobei der Momentenarm mit m bezeichnet ist. Die Richtung der Durchbiegung ist in Fig. 2 durch Pfeil 26 angedeutet. Die Biegerichtung ist annähernd parallel zur Nachstellric htung des unteren Messers 20. Die entsprechende Verbiegung ist in Fig. 2 durch die gestrichelte Linie 27 angedeutet. Sowohl in Fig. 1 als auch in Fig. 2 ist die Durchbiegung der Messerwelle 26 stark übertrieben dargestellt. Man erkennt, daß aufgrund der Durchbiegung die Messer 19, 20 mit einer erhöhten Vorspannung gegeneinander liegen, wenn sie sich berühren. Diese Vorspannung ist abhängig vom Ausmaß der Durchbiegung und diese ist abhängig von der aufgebrachten Biegekraft. Wird auf beide Kerne 11, 12 ein Biegemoment aufgebracht, reduziert sich die Biegekraft auf die Hälfte.The lower core 12 is movably supported in the machine frame 10 by means of self-aligning bearings 23, 24. Its ends protrude to a certain extent on both sides. With the help of a force unit, not shown, pressure can be exerted on both ends, as indicated by the arrows 25. In this way, a bending moment is applied to the core 12 from both sides, the moment arm being denoted by m. The direction of the deflection is indicated by arrow 26 in FIG. 2. The bending direction is approximately parallel to the adjustment knife of the lower knife 20. The corresponding bending is indicated in FIG. 2 by the dashed line 27. Both in Fig. 1 and in Fig. 2, the deflection of the knife shaft 26 is shown greatly exaggerated. It can be seen that, due to the deflection, the knives 19, 20 lie against one another with an increased pretension when they touch. This pretension depends on the extent of the deflection and this depends on the applied bending force. If a bending moment is applied to both cores 11, 12, the bending force is reduced to half.

Das Aufbringen des Biegemoments kann von irgendeiner geeigneten Kraftvorrichtung bewerkstelligt werden, die pneumatisch, hydraulisch, mechanisch, elektromechanisch oder dergleichen betrieben wird.The application of the bending moment can be accomplished by any suitable force device that is operated pneumatically, hydraulically, mechanically, electromechanically or the like.

Claims (4)

  1. Cross-cutter for cutting weblike matter, especially so corrugated board, by means of a pair of knife carrier shafts (15, 16) which are supported by means of shaft bearings (13, 14) for free rotation on a core (11, 12) fitted in the machine frame (10) and driven by a common driving device, the knives (19, 20), if necessary under pre-tension, getting briefly in touch with one another during the cutting process, characterised by the fact that at least one end of at least one core (12) which end has a bearing (23, 24) admitting a bend within the machine frame (10) includes a driving unit producing a bending effect on the core (12) which is transmitted through the shaft bearing (14) to the attributed knife carrier shaft (16) in such a way that the knives, when touching one another under pre-tension, are pressed against one another.
  2. Cross-cutter according to claim 1, on which at least the knife of a carrier shaft is fitted shiftable, characterised by the bending direction of the core (12) being approximately in parallelism to the readjustment direction of the knife (20).
  3. Cross-cutter according to claim 1 or 2, characterised by the load direction of the driving unit being variable for readjusting the bending direction.
  4. Cross-cutter according to one of the claims 1 to 3, characterised by the core (12) being supported by means of a self-aligning bearing (23, 24) in the machine frame (10).
EP87113899A 1986-10-08 1987-09-23 Cross cutter Expired - Lifetime EP0263359B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3634198 1986-10-08
DE19863634198 DE3634198A1 (en) 1986-10-08 1986-10-08 CUTTER

Publications (2)

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EP0263359A1 EP0263359A1 (en) 1988-04-13
EP0263359B1 true EP0263359B1 (en) 1991-05-15

Family

ID=6311256

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EP87113899A Expired - Lifetime EP0263359B1 (en) 1986-10-08 1987-09-23 Cross cutter

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US (1) US4756219A (en)
EP (1) EP0263359B1 (en)
JP (1) JPS63245391A (en)
DE (2) DE3634198A1 (en)
ES (1) ES2022249B3 (en)

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DE3860160D1 (en) * 1987-04-23 1990-06-28 Schloemann Siemag Ag LENGTH STRIP SCISSORS.
DE4240232C2 (en) * 1992-11-30 1995-04-27 Bhs Corr Masch & Anlagenbau Sheeters for webs, in particular for a corrugated board web
US5713256A (en) * 1994-03-09 1998-02-03 The Langston Corporation Dual speed limits for a cut-off
US6073527A (en) * 1997-04-11 2000-06-13 Marquip, Inc. Method and apparatus for direct shingling of cut sheets at the cutoff knife
US6032558A (en) * 1998-03-20 2000-03-07 Marquip, Inc. Rotary knife with active vibration control
US6389941B1 (en) 2000-04-14 2002-05-21 Marquip, Llc Rotary knife with electromagnetic active vibration control
DE10109933C1 (en) * 2001-02-21 2002-08-22 Aichele Werkzeuge Gmbh Cutting device and cutting tool
SE527556C2 (en) * 2004-07-02 2006-04-11 Sandvik Intellectual Property A support roller for a rotary knife unit and a rotation knife unit with such a support roller
SE527845C2 (en) * 2004-11-03 2006-06-20 Sandvik Intellectual Property A support roller for a rotary knife unit and a rotary knife unit with such a support roller
DE102007016451A1 (en) * 2007-03-30 2008-10-02 Wilhelm Aichele A rotary knife
ES2332120B1 (en) * 2008-06-20 2010-11-04 Manuel Torres Martinez CUTTING SYSTEM FOR STRIPS.
IT1394271B1 (en) * 2009-05-25 2012-06-06 Ima Flavour S R L Ora Ima Ind S R L COMPRESSION GROUP - ENGRAVING - ROLLER CUTTING
EP3191269B1 (en) * 2014-09-10 2018-07-11 FOSBER S.p.A. Device for transverse cutting of a web material and machine containing said device
JP6148418B1 (en) * 2016-02-24 2017-06-14 日本タングステン株式会社 Roll for rotary cutter and rotary cutter

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Also Published As

Publication number Publication date
DE3634198A1 (en) 1988-04-21
JPS63245391A (en) 1988-10-12
ES2022249B3 (en) 1991-12-01
EP0263359A1 (en) 1988-04-13
US4756219A (en) 1988-07-12
DE3634198C2 (en) 1988-10-13
DE3770106D1 (en) 1991-06-20

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