EP0443337B1 - Cutter block for a document shredder - Google Patents

Cutter block for a document shredder Download PDF

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Publication number
EP0443337B1
EP0443337B1 EP91100862A EP91100862A EP0443337B1 EP 0443337 B1 EP0443337 B1 EP 0443337B1 EP 91100862 A EP91100862 A EP 91100862A EP 91100862 A EP91100862 A EP 91100862A EP 0443337 B1 EP0443337 B1 EP 0443337B1
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EP
European Patent Office
Prior art keywords
spacer rings
knife
shaft
rings
cutter
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
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EP91100862A
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German (de)
French (fr)
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EP0443337A1 (en
Inventor
Willi Strohmeyer
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Geha Werke GmbH
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Geha Werke GmbH
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Publication of EP0443337A1 publication Critical patent/EP0443337A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/0007—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00—Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16—Details
    • B02C18/18—Knives; Mountings thereof
    • B02C18/182—Disc-shaped knives
    • 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
    • Y10T83/768—Rotatable disc tool pair or tool and carrier
    • Y10T83/7809—Tool pair comprises rotatable tools
    • Y10T83/783—Tool pair comprises contacting overlapped discs
    • Y10T83/7834—With means to effect axial pressure on pair

Definitions

  • the invention relates to a knife shaft for document shredders, which is formed by knife disks lined up on a shaft with intermediate spacer rings which are fixed in length on the shaft by means for axial locking.
  • Document shredders generally have two knife shafts, the knife disks of which engage one another and which are driven in opposite rotation. Written material is shredded between the knife disks. If there are thin knife disks that only touch on one side and cut the paper here, it is important for proper functioning that the knife disks are firmly clamped against each other and that the distances between the knife disks lined up on the knife shafts and braced against each other are the same on both knife shafts. Otherwise there is tension between the two cutter shafts, which results in increased frictional forces, which reduce the performance of the document shredder or make the assembly of a functional cutting unit impossible. On the other hand, dimensional deviations can result in the knife disks not touching each other. In this case, there is no cutting effect.
  • the invention has for its object to avoid this disadvantage and to create the possibility of inexpensive manufacture of dimensionally stable knife shafts.
  • the spacer rings of the knife shaft are conical on at least one end face and that the distances between the knife disks by compressing the spacer rings in the axial direction can be brought to a predetermined dimension by means of locking means (grooves, snap rings), produce dimensionally accurate knife shafts with high accuracy.
  • the distances between the opposite grooves and snap rings precisely specify the distances between the cutter disc. It is therefore possible to compensate for inaccuracies in the thickness of the knife disks and the spacer rings.
  • the cutter discs with the spacer rings in between are pressed together to the required size using a device.
  • spacer rings made of a deformable plastic can be used.
  • Such spacer rings are inexpensive to produce by spraying and are particularly suitable for use in smaller document shredders whose knife shafts are exposed to a relatively low load during the cutting process.
  • the spacer rings are conical on one or preferably on both end faces. If the greatest width of the spacer rings is on the outside, it is achieved that the deformation takes place in the outer region of the spacer rings. The material then deflects outwards when pressed together and it is ensured that the mobility of the spacer rings on the shaft of the knife shaft is retained. There are then no additional frictional forces in the area of the shaft when the knife shaft is pressed together, which would require the use of greater forces for the deformation. If the spacer rings are spherical on their peripheral surfaces, it can be achieved that the deformed material does not enlarge the outer diameter of the spacer rings.
  • the material displaced during compression collects in the sections adjacent to the deformation zones on the circumference of the spacer rings.
  • the crown is preferably chosen so that the bulge in the sections adjacent to the deformation zones is smaller than the largest diameter of the spacer rings in the region of the largest crown.
  • the means for locking the knife disks and the spacer rings of the knife shafts are preferably designed as grooves arranged on both sides in the shaft, into which snap rings engage.
  • the grooves arranged in the shaft provide the exact measure for the length of the knife shaft.
  • 1 denotes a knife shaft, on the shaft 2 knife disks 3 and spacer rings 4 are lined up. Grooves 5 are arranged in the shaft 2 on both sides of the row of knife disks 3 and spacer rings 4, into which snap rings 6 are inserted. Intermediate rings 7 pushed onto shaft 2 each rest on snap rings 6. Via the intermediate rings 7, the snap rings 6 hold the knife disks 3 and spacer rings 4 pushed against one another during assembly by means of a device (not shown in the drawing) in their mutually braced position. The arrangement of the intermediate rings 7 serves exclusively to optimally transfer the clamping forces to the snap rings 6. It is entirely possible to omit the intermediate rings 7 if necessary.
  • a spacer ring 4 is shown in cross section in FIG. 2 of the drawing.
  • the two end faces 8 of the spacer ring 4 are conical. This ensures that the adjacent spacer rings have small contact surfaces on which large surface pressures result when compressed. From this results the advantage that in the initial phase of compression by means of relatively small forces, a relatively large deformation can be achieved. With increasing deformation, the contact surfaces increase, so that finally a certain solidification of the knife shaft 1 is achieved after reaching the predetermined dimension. This means that the desired deformation of the spacer rings 4 is achieved without great effort during assembly, but that, on the other hand, the knife shaft 1 in the fully assembled state achieves sufficient stability which is adapted to the operating conditions.
  • the degree of beveling of the end faces 8 of the spacer rings 4 and the selection of the material make it possible to adapt the spacer rings 4 to the conditions required in each case. It has proven to be useful to produce the spacer rings 4 from a suitable plastic for knife shafts 1 for small document shredders. For highly loaded knife shafts 1, it has proven to be expedient to produce the spacer rings 4 from a deformable metal.
  • the selection of the right materials depends on the degree of stress on the spacer rings 4 and the design of the end faces 8 of the spacer rings 4. As has been shown, it is particularly advantageous if the end faces 8 are inclined at an angle of approximately 15 °.
  • the spacer rings 4 are advantageously spherical on their peripheral surfaces 9. This ensures that the circumferential surfaces 9 bulging in the vicinity of the contact surfaces do not enlarge the outer diameter of the spacer rings 4 during the deformation in the region of the contact surfaces.
  • the crowning of the peripheral surfaces 9 of the spacer rings 4 is preferably chosen so that the bulge of the peripheral surfaces 9 does not protrude beyond the largest diameter in the middle of the peripheral surfaces 9.
  • spacer rings 4 are made of plastic, it is possible, for example, to inject the spacer rings 4 from polyethylene. Spacer rings 4 subjected to higher loads can also be made from brass alloys, for example. Alternatively, of course, the use of other deformable materials is also possible.
  • the knife shaft 1 according to the invention is assembled in such a way that the knife disks 3 and the spacer rings 4 are pushed onto the shaft 2.
  • the cutter disks 3 and the spacer rings 4 are pressed together by means of a device (not shown in the drawing) to such an extent that the second snap ring 6 can also be inserted into the groove 5 at the free end of the shaft 2 .
  • the spacing of the grooves 5 specify the correct length dimension for the knife shaft 1.
  • the snap rings 6 hold the knife disks 3 and the spacer rings 4 in a clamped state against one another.
  • the correct dimension is obtained not only for the total length of the knife shaft 1, but also for the distance between the individual knife disks 3. It is therefore independent of fluctuations in the material thicknesses of the individual knife disks 3, a large dimensional accuracy the knife shaft 1 ensured.
  • the knife disks 3 of the two knife shafts 1, which interlock when the document shredder is assembled are always at a correct distance from one another.
  • the knife disks 3 lie against each other in such a way that a perfect cutting process is ensured, but on the other hand the frictional forces between the knife disks 3 are so low that the performance of the document shredder is not impaired.
  • the knife shaft 1 according to the invention ensures that high-performance document shredders can be produced in a uniformly high quality with inexpensive production.

Description

Die Erfindung bezieht sich auf eine Messerwelle für Schriftgutvernichter, die von auf einer Welle aufgereihten Messerscheiben mit dazwischenliegenden Distanzringen, die auf der Welle von Mitteln zur axialen Arretierung in der Länge fixiert sind, gebildet ist.The invention relates to a knife shaft for document shredders, which is formed by knife disks lined up on a shaft with intermediate spacer rings which are fixed in length on the shaft by means for axial locking.

Schriftgutvernichter weisen in der Regel zwei Messerwellen auf, deren Messerscheiben aneinanderliegen ineinandergreifen und die gegenläufig rotierend angetrieben werden. Zugeführtes Schriftgut wird zwischen den Messerscheiben zerkleinert. Sofern es sich um dünne Messerscheiben handelt, die sich jeweils nur an einer Seite berühren und hier das Papier schneiden, ist es für eine einwandfreie Funktion wichtig, daß die Messerscheiben fest gegeneinander verspannt sind und daß die Abstände der auf den Messerwellen aufgereihten und gegeneinander verspannten Messerscheiben auf beiden Messerwellen gleich sind. Andernfalls kommt es zu Verspannungen zwischen beiden Messerwellen, aus denen sich erhöhte Reibungskräfte ergeben, die die Leistungsfähigkeit des Schriftgutvernichters herabsetzen bzw. die Montage eines funktionsfähigen Schneidwerkes unmöglich machen. Andererseits können Maßabweichungen dazu führen, daß die Messerscheiben sich nicht berühren. In diesem Fall tritt keine Schneidwirkung ein.Document shredders generally have two knife shafts, the knife disks of which engage one another and which are driven in opposite rotation. Written material is shredded between the knife disks. If there are thin knife disks that only touch on one side and cut the paper here, it is important for proper functioning that the knife disks are firmly clamped against each other and that the distances between the knife disks lined up on the knife shafts and braced against each other are the same on both knife shafts. Otherwise there is tension between the two cutter shafts, which results in increased frictional forces, which reduce the performance of the document shredder or make the assembly of a functional cutting unit impossible. On the other hand, dimensional deviations can result in the knife disks not touching each other. In this case, there is no cutting effect.

Bei Abweichungen in den Abständen zwischen den Messerscheiben der Messerwellen können sich außerdem Probleme ergeben, sofern einteilige Abstreifer mit fest vorgegebenen Abständen der Abstreifer verwendet werden, wie sie beispielsweise in der DE-A-36 16 554 beschrieben sind. In diesem Fall treten bei Maßabweichungen zwischen den Messerscheiben und dem Abstreifer schädliche Reibungskräfte auf. Gegebenenfalls ist eine Montage des Schneidwerkes sogar überhaupt nicht möglich.In the event of deviations in the distances between the cutter disks of the cutter shafts, problems can also arise if one-piece wipers with fixed wiper intervals are used, as described, for example, in DE-A-36 16 554. In this case, there are harmful frictional forces if there are dimensional deviations between the knife disks and the scraper. It may even be impossible to assemble the cutting unit at all.

Die Ungenauigkeiten ergeben sich bei den Messerwellen der genannten Gattung sehr leicht daraus, daß die Messerscheiben aus in seiner Stärke geringfügig schwankendem Material gestanzt und dann geschliffen werden. Das gleiche gilt für die üblicherweise als Drehteil hergestellten Distanzringe. Über die Länge der Messerwellen wirken sich geringfügige Abweichungen in der Materialstärke so stark aus, daß der bereits geschilderte negative Effekt sehr leicht eintritt. Zur Vermeidung der nachteiligen Ungenauigkeiten war es bisher erforderlich, bei der Materialauswahl und der Herstellung der Einzelteile eine hohen, kostenträchtigen Aufwand zu treiben.The inaccuracies in the knife shafts of the type mentioned arise very easily from the fact that the knife disks are punched out of material which varies slightly in thickness and are then ground. The same applies to the spacer rings usually manufactured as a turned part. Over the length of the knife shafts, slight deviations in the material thickness have such an effect that the negative effect already described occurs very easily. In order to avoid the disadvantageous inaccuracies, it was previously necessary to go to great expense in the selection of materials and the manufacture of the individual parts.

Durch die DE-A-2524086 ist es bereits bekannt geworden, auf einer Messerwelle für Schriftgutvernichter die aufgereihten Messerscheiben und die dazwischenliegenden Distanzringe auf der Welle axial unverschiebbar zur fixieren. Die Fixierung erfolgt hier an der einen Seite der Messerwelle mittels eines in einen Nut eingreifenden Sprengringes und eines Ringes und auf der entgegengesetzten Seite durch ein Zusammendrücken mittels einer Schraube, die auf einen Ring einwirkt. Die Schraube dient hier dazu, die Messer, Distanzringe und gegebenenfalls vorhandene Abstreifer, axial unverschiebbar auf der Messerwelle zu halten. Auch hier ergibt sich der Nachteil, daß es bei Maßabweichungen bei der Stärke der Messerscheiben und/oder der Distanzringe zu einer Summierung der Maßabweichungen kommt. Dieses führt zu Verspannungen an den ineinandergreifenden Messerscheiben benachbarter Messerwellen, die die Schneidleistung des Gerätes erheblich beeinflussen können. Zur Vermeidung der nachteiligen Ungenauigkeiten ist es auch hier erforderlich, bei der Herstellung der Einzelteile einen hohen, kostenträchtigen Aufwand zu treiben.From DE-A-2524086 it has already become known to axially immovably fix the aligned knife disks and the intermediate spacer rings on the shaft on a knife shaft for document shredders. The fixation takes place here on one side of the knife shaft by means of a snap ring which engages in a groove and a ring and on the opposite side by being compressed by means of a screw which acts on a ring. The screw is used here to hold the knives, spacer rings and, if applicable, wipers, axially immovable on the knife shaft. Here, too, there is the disadvantage that, if there are dimensional deviations in the thickness of the knife disks and / or the spacer rings, the dimensional deviations add up. This leads to tension on the intermeshing cutter discs of adjacent cutter shafts, which can have a considerable influence on the cutting performance of the device. To avoid the disadvantageous inaccuracies, it is also necessary here to make a high, costly effort in the manufacture of the individual parts.

Der Erfindung liegt die Aufgabe zugrunde, diesen Nachteil zu vermeiden und die Möglichkeit einer kostengünstigen Herstellung maßhaltiger Messerwellen zu schaffen.The invention has for its object to avoid this disadvantage and to create the possibility of inexpensive manufacture of dimensionally stable knife shafts.

Diese Aufgabe wird erfindungsgemäß durch die Merkmale des Anspruchs 1 gelöst. Dadurch, daß die Distanzringe der Messerwelle an wenigstens einer Stirnseite konisch ausgebildet sind und daß die Abstände zwischen den Messerscheiben durch Zusammendrücken der Distanzringe in axialer Richtung auf ein, durch die Mittel zur Arretierung (Nuten, Sprengringe) vorbestimmtes Maß bringbar sind, ist es möglich, maßhaltige Messerwellen mit hoher Genauigkeit herzustellen. Die Abstände der gegenüberliegenden Nuten und Sprengringe geben die Abstände zwischen den Messerscheibe exakt vor. Es ist somit möglich, Ungenauigkeiten in der Stärke der Messerscheiben und der Distanzringe auszugleichen. Bei der Montage werden die Messerscheiben mit den dazwischenliegenden Distanzringen mittels einer Vorrichtung auf das erforderliche Maß zusammengedrückt.This object is achieved by the features of claim 1. The fact that the spacer rings of the knife shaft are conical on at least one end face and that the distances between the knife disks by compressing the spacer rings in the axial direction can be brought to a predetermined dimension by means of locking means (grooves, snap rings), produce dimensionally accurate knife shafts with high accuracy. The distances between the opposite grooves and snap rings precisely specify the distances between the cutter disc. It is therefore possible to compensate for inaccuracies in the thickness of the knife disks and the spacer rings. During assembly, the cutter discs with the spacer rings in between are pressed together to the required size using a device.

Wie es sich gezeigt hat, können aus einem verformbaren Kunststoff hergestellte Distanzringe verwendet werden. Derartige Distanzringe sind im Spritzverfahren kostengünstig herstellbar und eigenen sich insbesondere für den Einsatz in kleineren Schriftgutvernichtern, deren Messerwellen beim Schneidvorgang einer relativ geringen Belastung ausgesetzt sind. Für die Messerwellen größerer Schriftgutvernichter mit hoher Leistung hat es sich als zweckmäßig erwiesen, die Distanzringe aus einem Material höherer Festigkeit, wie beispielsweise auch einem verformbaren Metall herzustellen. So kann eine Verformung der Distanzringe aufgrund der an den Messerscheiben auftretenden höheren Schneidkräfte verhindert werden.As has been shown, spacer rings made of a deformable plastic can be used. Such spacer rings are inexpensive to produce by spraying and are particularly suitable for use in smaller document shredders whose knife shafts are exposed to a relatively low load during the cutting process. For the knife shafts of large document shredders with high performance, it has proven to be expedient to produce the spacer rings from a material of higher strength, such as a deformable metal, for example. This can cause deformation of the Spacer rings can be prevented due to the higher cutting forces occurring on the cutter discs.

Als vorteilhaft hat es sich erwiesen, wenn die Distanzringe an einer oder aber vorzugsweise an beiden Stirnseiten konisch ausgebildet sind. Sofern die größte Breite der Distanzringe außen liegt, wird erreicht, daß die Verformung im äußeren Bereich der Distanzringe erfolgt. Das Material weicht dann beim Zusammenpressen nach außen aus und es ist sichergestellt, daß die Beweglichkeit der Distanzringe auf der Welle der Messerwelle erhalten bleibt. Es treten dann im Bereich der Welle beim Zusammenpressen der Messerwelle keine zusätzlichen Reibungskräfte auf, die für die Verformung einen Einsatz größerer Kräfte erforderlich machen würden. Sofern die Distanzringe an ihren Umfangsflächen ballig ausgebildet sind, kann erreicht werden, daß das verformte Material den äußeren Durchmesser der Distanzringe nicht vergrößert. Das beim Zusammendrücken verdrängte Material sammelt sich in den den Verformungszonen benachbarten Abschnitten am Umfang der Distanzringe an. Die Balligkeit wird vorzugsweise so gewählt, daß die Aufwölbung in den den Verformungszonen benachbarten Abschnitten kleiner ist als der größte Durchmesser der Distanzringe im Bereich der größten Balligkeit.It has proven to be advantageous if the spacer rings are conical on one or preferably on both end faces. If the greatest width of the spacer rings is on the outside, it is achieved that the deformation takes place in the outer region of the spacer rings. The material then deflects outwards when pressed together and it is ensured that the mobility of the spacer rings on the shaft of the knife shaft is retained. There are then no additional frictional forces in the area of the shaft when the knife shaft is pressed together, which would require the use of greater forces for the deformation. If the spacer rings are spherical on their peripheral surfaces, it can be achieved that the deformed material does not enlarge the outer diameter of the spacer rings. The material displaced during compression collects in the sections adjacent to the deformation zones on the circumference of the spacer rings. The crown is preferably chosen so that the bulge in the sections adjacent to the deformation zones is smaller than the largest diameter of the spacer rings in the region of the largest crown.

Die Mittel zur Arretierung der Messerscheiben und der Distanzringe der Messerwellen sind vorzugsweise als in der Welle beidseitig angeordnete Nuten, in die Sprengringe eingreifen, ausgebildet. Hier geben die in der Welle angeordneten Nuten das exakte Maß für die Länge der Messerwelle vor. Bei der Montage der Messerwelle wird dabei so verfahren, daß die Messerscheiben und Distanzringe auf der Welle aufgereiht werden, daß einseitig ein Sprengring in die Nut eingeschoben wird und daß dann mittels einer Vorrichtung die Messerscheiben und die Distanzringe auf das vorbestimmte Maß zusammengedrückt werden, so daß auch an der gegenüberliegenden Seite der Messerwelle der Sprengring in die Nut eingeschoben werden kann und dann die Messerscheiben und die Distanzringe in der richtigen Position festhält.The means for locking the knife disks and the spacer rings of the knife shafts are preferably designed as grooves arranged on both sides in the shaft, into which snap rings engage. Here the grooves arranged in the shaft provide the exact measure for the length of the knife shaft. When assembling the knife shaft, the knife disks and spacer rings are lined up on the shaft so that a snap ring is inserted into the groove on one side, and then the knife disks and the spacer rings are pressed together to the predetermined dimension using a device, so that also on the opposite side of the knife shaft Snap ring can be inserted into the groove and then holds the knife disks and the spacer rings in the correct position.

Ein Ausführungsbeispiel der Erfindung wird nachfolgend anhand der Zeichnungen näher erläutert.An embodiment of the invention is explained below with reference to the drawings.

Es zeigen

  • Figur 1 eine Messerwelle eines Schriftgutvernichters in der Seitenansicht,
  • Figur 2 einen Distanzring im Querschnitt.
Show it
  • FIG. 1 shows a knife shaft of a document shredder in a side view,
  • Figure 2 shows a spacer ring in cross section.

In der Zeichnung ist mit 1 eine Messerwelle bezeichnet, auf deren Welle 2 Messerscheiben 3 und Distanzringe 4 aufgereiht sind. In der Welle 2 sind beidseitig der aufgereihten Messerscheiben 3 und Distanzringe 4 Nuten 5 angeordnet, in die Sprengringe 6 eingeschoben sind. An den Sprengringen 6 liegen jeweils auf die Welle 2 aufgeschobene Zwischenringe 7 an. Über die Zwischenringe 7 halten die Sprengringe 6 die bei der Montage mittels einer in der Zeichnung nicht dargestellten Vorrichtung gegeneinander geschobenen Messerscheiben 3 und Distanzringe 4 in ihrer gegeneinander verspannten Position. Die Anordnung der Zwischenringe 7 dient dabei ausschließlich einer optimalen Überleitung der Spannkräfte auf die Sprengringe 6. Es ist durchaus möglich, die Zwischenringe 7 gegebenenfalls wegzulassen.In the drawing, 1 denotes a knife shaft, on the shaft 2 knife disks 3 and spacer rings 4 are lined up. Grooves 5 are arranged in the shaft 2 on both sides of the row of knife disks 3 and spacer rings 4, into which snap rings 6 are inserted. Intermediate rings 7 pushed onto shaft 2 each rest on snap rings 6. Via the intermediate rings 7, the snap rings 6 hold the knife disks 3 and spacer rings 4 pushed against one another during assembly by means of a device (not shown in the drawing) in their mutually braced position. The arrangement of the intermediate rings 7 serves exclusively to optimally transfer the clamping forces to the snap rings 6. It is entirely possible to omit the intermediate rings 7 if necessary.

In der Figur 2 der Zeichnung ist ein Distanzring 4 im Querschnitt dargestellt. Wie aus der Zeichnung ersichtlich, sind die beiden Stirnseiten 8 des Distanzringes 4 konisch ausgebildet. Hierdurch wird erreicht, daß die benachbarten Distanzringe kleine Berührungsflächen aufweisen, an denen sich beim Zusammendrücken große Flächenpressungen ergeben. Hieraus ergibt sich der Vorteil, daß in der Anfangsphase des Zusammendrückens mittels relativ kleiner Kräfte eine relativ große Verformung erreicht werden kann. Mit zunehmender Verformung vergrößern sich die Berührungsflächen, so daß schließlich nach Erreichen des vorbestimmten Maßes eine gewisse Verfestigung der Messerwelle 1 erreicht wird. Das bedeutet, daß bei der Montage die angestrebte Verformung der Distanzringe 4 ohne großen Aufwand erreicht wird, daß andererseits aber die Messerwelle 1 im fertig montierten Zustand eine den Einsatzbedingungen angepaßte, ausreichende Stabilität erreicht. Durch den Grad der Abschrägung der Stirnseiten 8 der Distanzringe 4 sowie durch die Auswahl des Materials ist es möglich, die Distanzringe 4 an die jeweils erforderlichen Bedingungen anzupassen. Dabei hat es sich als zweckmäßig erwiesen, bei Messerwellen 1 für kleine Schriftgutvernichter die Distanzringe 4 aus einem geeigneten Kunststoff herzustellen. Für hochbelastete Messerwellen 1 hat es sich als zweckmäßig erwiesen, die Distanzringe 4 aus einem verformbaren Metall herzustellen. Die Auswahl der richtigen Werkstoffe richtet sich nach dem Grad der Beanspruchung der Distanzringe 4 und der Gestaltung der Stirnseiten 8 der Distanzringe 4. Wie es sich gezeigt hat, ist es besonders günstig, wenn die Stirnseiten 8 in einem Winkel von etwa 15° geneigt sind.A spacer ring 4 is shown in cross section in FIG. 2 of the drawing. As can be seen from the drawing, the two end faces 8 of the spacer ring 4 are conical. This ensures that the adjacent spacer rings have small contact surfaces on which large surface pressures result when compressed. From this results the advantage that in the initial phase of compression by means of relatively small forces, a relatively large deformation can be achieved. With increasing deformation, the contact surfaces increase, so that finally a certain solidification of the knife shaft 1 is achieved after reaching the predetermined dimension. This means that the desired deformation of the spacer rings 4 is achieved without great effort during assembly, but that, on the other hand, the knife shaft 1 in the fully assembled state achieves sufficient stability which is adapted to the operating conditions. The degree of beveling of the end faces 8 of the spacer rings 4 and the selection of the material make it possible to adapt the spacer rings 4 to the conditions required in each case. It has proven to be useful to produce the spacer rings 4 from a suitable plastic for knife shafts 1 for small document shredders. For highly loaded knife shafts 1, it has proven to be expedient to produce the spacer rings 4 from a deformable metal. The selection of the right materials depends on the degree of stress on the spacer rings 4 and the design of the end faces 8 of the spacer rings 4. As has been shown, it is particularly advantageous if the end faces 8 are inclined at an angle of approximately 15 °.

Vorteilhafterweise sind die Distanzringe 4 an ihren Umfangsflächen 9 ballig ausgebildet. Hierdurch wird erreicht, daß bei der Verformung im Bereich der Berührungsflächen die sich in der Nähe der Berührungsflächen aufwölbenden Umfangsflächen 9 den Außendurchmesser der Distanzringe 4 nicht vergrößern. Die Balligkeit der Umfangsflächen 9 der Distanzringe 4 wird vorzugsweise so gewählt, daß die Aufwölbung der Umfangsflächen 9 über den größten Durchmesser in der Mitte der Umfangsflächen 9 nicht hinausragt.The spacer rings 4 are advantageously spherical on their peripheral surfaces 9. This ensures that the circumferential surfaces 9 bulging in the vicinity of the contact surfaces do not enlarge the outer diameter of the spacer rings 4 during the deformation in the region of the contact surfaces. The crowning of the peripheral surfaces 9 of the spacer rings 4 is preferably chosen so that the bulge of the peripheral surfaces 9 does not protrude beyond the largest diameter in the middle of the peripheral surfaces 9.

Sofern die Distanzringe 4 aus Kunststoff hergestellt sind, ist es beispielsweise möglich, die Distanzringe 4 aus Polyäthylen zu spritzen. Höher belastete Distanzringe 4 können beispielsweise auch aus Messinglegierungen gefertigt werden. Selbstverständlich ist alternativ auch der Einsatz anderer verformbarer Materialien möglich.If the spacer rings 4 are made of plastic, it is possible, for example, to inject the spacer rings 4 from polyethylene. Spacer rings 4 subjected to higher loads can also be made from brass alloys, for example. Alternatively, of course, the use of other deformable materials is also possible.

Die Montage der erfindungsgemäßen Messerwelle 1 geschieht in der Form, daß die Messerscheiben 3 und die Distanzringe 4 auf die Welle 2 geschoben werden. Nach Einlegen eines Sprengringes 6 in eine Nut 5 der Welle 2 werden die Messerscheiben 3 und die Distanzringe 4 mittels einer in der Zeichnung nicht dargestellten Vorrichtung soweit zusammengedrückt, daß auch der zweite Sprengring 6 am freien Ende der Welle 2 in die Nut 5 eingeführt werden kann. Die Abstände der Nuten 5 geben das richtige Längenmaß für die Messerwelle 1 vor. Die Sprengringe 6 halten nach dem Entfernen der Vorrichtung die Messerscheiben 3 und die Distanzringe 4 in gegeneinander verspanntem Zustand fest.The knife shaft 1 according to the invention is assembled in such a way that the knife disks 3 and the spacer rings 4 are pushed onto the shaft 2. After inserting a snap ring 6 in a groove 5 of the shaft 2, the cutter disks 3 and the spacer rings 4 are pressed together by means of a device (not shown in the drawing) to such an extent that the second snap ring 6 can also be inserted into the groove 5 at the free end of the shaft 2 . The spacing of the grooves 5 specify the correct length dimension for the knife shaft 1. After the device has been removed, the snap rings 6 hold the knife disks 3 and the spacer rings 4 in a clamped state against one another.

Aufgrund der Verformbarkeit der Distanzringe 4 ergibt sich im verspannten Zustand nicht nur für die Gesamtlänge der Messerwelle 1 das richtige Maß, sondern auch für den Abstand zwischen den einzelnen Messerscheiben 3. Es ist somit unabhängig von Schwankungen in den Materialstärken der einzelnen Messerscheiben 3 eine große Maßhaltigkeit der Messerwelle 1 sichergestellt. Das bedeutet, daß die Messerscheiben 3 der beiden Messerwellen 1, die im montierten Zustand des Schriftgutvernichters ineinandergreifen, stets in einem richtigen Abstand zueinander liegen. Die Messerscheiben 3 legen sich so gegeneinander, daß ein einwandfreier Schneidvorgang gewährleistet ist, daß andererseits aber die Reibungskräfte zwischen den Messerscheiben 3 so gering sind, daß die Leistungsfähigkeit des Schriftgutvernichters nicht beeinträchtigt wird.Due to the deformability of the spacer rings 4, the correct dimension is obtained not only for the total length of the knife shaft 1, but also for the distance between the individual knife disks 3. It is therefore independent of fluctuations in the material thicknesses of the individual knife disks 3, a large dimensional accuracy the knife shaft 1 ensured. This means that the knife disks 3 of the two knife shafts 1, which interlock when the document shredder is assembled, are always at a correct distance from one another. The knife disks 3 lie against each other in such a way that a perfect cutting process is ensured, but on the other hand the frictional forces between the knife disks 3 are so low that the performance of the document shredder is not impaired.

Sofern ein aus einem Stück gefertigter Abstreifer verwendet wird, ist hier ein ausreichender Abstand der Messerscheiben 3 zu den Stegen des Abstreifers gewährleistet, so daß auch hier keine schädlichen Reibungskräfte auftreten können. Die erfindungsgemäße Messerwelle 1 stellt sicher, daß bei kostengünstiger Herstellung leistungsfähige Schriftgutvernichter in gleichmäßig hoher Qualität gefertigt werden können.If a wiper made from one piece is used, a sufficient distance between the cutter disks 3 and the webs of the wiper is ensured here, so that no harmful frictional forces can occur here either. The knife shaft 1 according to the invention ensures that high-performance document shredders can be produced in a uniformly high quality with inexpensive production.

Claims (5)

  1. A cutter block (1) for document shredders, comprising cutter discs (3) disposed in line on a shaft (2) and separated by spacer rings (4) longitudinally secured on the shaft (2) by axial locking means (5, 6), characterised in that the spacer rings (4) on the cutter block (1) are conical at at least one end (8), and the distances between the cutter discs (3) are adjustable, by compressing the spacer rings (4) in the axial direction, to a value determined by the locking means (grooves 5 and snap rings 6).
  2. A cutter block (1) according to claim 1, characterised in that the maximum width of the spacer rings (4), which are conical at at least one end (8), extends radially outwards.
  3. A cutter block (1) according to any of the preceding claims, characterised in that the spacer rings (4) are conical at at least one end (8), at an angle of approximately 15°.
  4. A cutter block (1) according to any of the preceding claims, characterised in that the peripheral surfaces (9) of the spacer rings (4) are spherical.
  5. A cutter block (1) according to any of the preceding claims, characterised in that the means for axially locking the cutter discs (3) and the spacer rings (4) are grooves (5) disposed on each side of the shaft (2) and engaging the snap rings (6).
EP91100862A 1990-02-22 1991-01-24 Cutter block for a document shredder Expired - Lifetime EP0443337B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4005556A DE4005556A1 (en) 1990-02-22 1990-02-22 Blade sheet for document shredder - has deformable spacer rings compressed between cutting discs to ensure even spacing along shaft
DE4005556 1990-02-22

Publications (2)

Publication Number Publication Date
EP0443337A1 EP0443337A1 (en) 1991-08-28
EP0443337B1 true EP0443337B1 (en) 1993-11-10

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EP91100862A Expired - Lifetime EP0443337B1 (en) 1990-02-22 1991-01-24 Cutter block for a document shredder

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US (1) US5135178A (en)
EP (1) EP0443337B1 (en)
JP (1) JPH05123593A (en)
DE (2) DE4005556A1 (en)

Families Citing this family (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5358187A (en) * 1992-09-09 1994-10-25 Ward Paula M L Methods of and apparatus for producing improved bedding materials from scrap newspaper
US5799887A (en) * 1996-10-24 1998-09-01 Fellowes Mfg. Co. Cutting cylinder for a document shredding machine
US5906569A (en) * 1997-09-30 1999-05-25 Ranpak Corp. Conversion machine and method for making folded strips
DE10034719A1 (en) * 2000-07-17 2002-01-31 Josef Froehling Gmbh Walzwerks Slitting shear
US6742731B2 (en) 2002-03-19 2004-06-01 Inter-Source Recovery Systems System and method of shredding wet chips in a flume
US7467755B2 (en) * 2003-07-01 2008-12-23 Inter-Source Recovery Systems, Inc. Parts separator apparatus and method of shredding
US7028935B2 (en) * 2003-07-01 2006-04-18 Inter-Source Recovery Systems, Inc. Apparatus and method for shredding wet chip materials
US7040559B2 (en) 2004-04-02 2006-05-09 Fellowes Inc. Shredder with lock for on/off switch
US7380736B2 (en) * 2005-05-04 2008-06-03 Inter-Source Systems, Inc. In-line shredder apparatus and method for shredding materials
US7641135B1 (en) * 2006-02-28 2010-01-05 Emily Lo Combinative cutting wheel of a rotary cutter of paper shredder
CN2915259Y (en) 2006-07-14 2007-06-27 上海震旦办公设备有限公司 Paper shredder touch safety device
US8008812B2 (en) 2006-07-14 2011-08-30 Aurora Office Equipment Co., Ltd. Paper shredder control system responsive to touch-sensitive element
US20080121340A1 (en) * 2006-11-08 2008-05-29 Meng-Chieh Lin Foam imprinting method
US7637448B2 (en) 2007-02-21 2009-12-29 Fellowes, Inc. Plastic center shredder disc
CN201239643Y (en) 2008-08-06 2009-05-20 上海震旦办公设备有限公司 Full automatic paper crusher without selecting paper
CN201244502Y (en) 2008-08-19 2009-05-27 上海震旦办公设备有限公司 Structure capable of removing nail of automatic paper crusher
CN101543800A (en) 2009-05-07 2009-09-30 上海震旦办公设备有限公司 Paper jamming prevention protective device of paper shredder
US8723468B2 (en) 2011-04-28 2014-05-13 Aurora Office Equipment Co., Ltd. Cooled motor
US8708260B2 (en) 2011-08-08 2014-04-29 Aurora Office Equipment Co., Ltd. Depowered standby paper shredder and method
US9968944B2 (en) 2013-03-15 2018-05-15 Inter-Source Recovery Systems Parts separator

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US737194A (en) * 1903-03-14 1903-08-25 Thos Mills & Bro Means for adjustably spacing disk cutters.
GB454623A (en) * 1934-03-27 1936-09-28 Eduard Quester Improvements in or relating to cutting devices
US2589603A (en) * 1949-04-26 1952-03-18 Cohen Herman Crushing machine
US2804134A (en) * 1954-02-01 1957-08-27 John G Berry Sheet material slitting machine
GB1022409A (en) * 1963-05-04 1966-03-16 Auguste Paul Durand Device for destroying documents
DE2524086C3 (en) * 1975-05-30 1986-07-31 Feinwerktechnik Schleicher & Co, 7778 Markdorf Device for tearing sheet material with two rollers
JPS55119451A (en) * 1979-03-08 1980-09-13 Hiroshi Yamashita Device for cutting discarding document
DE3313231A1 (en) * 1983-04-13 1984-10-18 Geha-Werke Gmbh, 3000 Hannover Cutter system for a paper shredder
JPS59160545A (en) * 1984-02-15 1984-09-11 松下電器産業株式会社 Shredder
DE3616554C2 (en) * 1986-05-16 1995-05-24 Schleicher Co Feinwerktech Knife roller stripping device for document shredders or the like

Also Published As

Publication number Publication date
DE59100564D1 (en) 1993-12-16
US5135178A (en) 1992-08-04
JPH05123593A (en) 1993-05-21
DE4005556C2 (en) 1992-01-16
DE4005556A1 (en) 1991-08-29
EP0443337A1 (en) 1991-08-28

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