EP0453851B1 - Dispositif de coupe pour un déchiqueteur de documents - Google Patents

Dispositif de coupe pour un déchiqueteur de documents Download PDF

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Publication number
EP0453851B1
EP0453851B1 EP19910105529 EP91105529A EP0453851B1 EP 0453851 B1 EP0453851 B1 EP 0453851B1 EP 19910105529 EP19910105529 EP 19910105529 EP 91105529 A EP91105529 A EP 91105529A EP 0453851 B1 EP0453851 B1 EP 0453851B1
Authority
EP
European Patent Office
Prior art keywords
cutting
knife
shafts
cutting device
disks
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
EP19910105529
Other languages
German (de)
English (en)
Other versions
EP0453851A1 (fr
Inventor
Willi Strohmeyer
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.)
Geha Werke GmbH
Original Assignee
Geha Werke 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 Geha Werke GmbH filed Critical Geha Werke GmbH
Publication of EP0453851A1 publication Critical patent/EP0453851A1/fr
Application granted granted Critical
Publication of EP0453851B1 publication Critical patent/EP0453851B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B02C18/24—Drives

Definitions

  • the invention relates to a cutting device for a document shredder with two rotating knife shafts arranged parallel to one another and driven by toothed wheels, each of which has a multiplicity of axially lined up, intermeshing knife disks, which act in pairs in the axial direction on their cutting flanks, i.e. be kept in cut contact.
  • GB-A-2064365 shows that spacer bushes can be arranged between the cutter disks of the cutter shafts.
  • the required cut contact of the knife disks is effected by an adjusting screw.
  • the described possible use of helical gears is also not used to generate an axially directed force component that could be used to make the cut contact between the cutter disks.
  • the invention is based on the object of avoiding the disadvantages mentioned and of adapting the axial forces effective on the knife shafts to the respective load.
  • the fact that the gears are fixed on the knife shafts in the axial direction and provided with helical gears means that, depending on the load on the cutting unit, i. builds up a load-dependent force component that is effective in the axial direction on the knife shafts from the amount of the document being fed.
  • This force component acting in the axial direction can be selected by the angle of the helical toothing of the gear wheels so that it maintains the cutting contact between the cutting flanks of the knife disks under all operating conditions.
  • the effect of the helical toothing of the gearwheels depending on the design of the housing of the cutting unit, often already results from the elasticities in the housing of the cutting unit and possibly also on the cutter discs. With the action of the axial force acting on the cutter shafts, these elasticities often already require a sufficiently large axial displacement of the cutter disks, which compensates for the evasive movement thereof due to the load during the cutting process.
  • a further advantageous effect results from the fact that, in the event that the cutting unit is stuck due to an overload, the direction of rotation is reversed when reversing, that an axial force component is built up on the helical gears of the gear wheels, which has the tendency to relieve the cutting flanks of the cutter disks and to move the cutter disks away from one another.
  • This effect encourages the cutting unit to run freely when reversing.
  • this effect also results without additional components having to be arranged or additional constructive measures causing costs having to be taken.
  • At least one of the knife shafts is supported with axial play.
  • Such an axial play ensures, regardless of the elasticity in the housing of the cutting unit, that the axial force component generated by the helical gears of the gear wheels becomes fully effective on the cutting flanks of the cutter disks.
  • running backwards i.e. when reversing the cutting unit to a clear separation of the cutting edges of the cutter discs from each other.
  • a clear gap is formed between the knife disks in accordance with the size of the axial play of the knife shafts, which significantly promotes the free running of the cutting mechanism.
  • cutter disks are formed as stamped parts and are braced against one another by means of spacers on the shafts of the cutter shafts.
  • Such a knife shaft is inexpensive to manufacture and, with the correct dimensioning of the parts, in particular also in a cutting unit with the features according to the invention, has a sufficiently high stability.
  • 1 denotes a cutting mechanism which has two rotating knife shafts 3 arranged parallel to one another and driven via gear wheels 2.
  • the gears 2 are provided with interlocking helical gears 4 and are arranged on the knife shafts 3 in a rotationally fixed and fixed manner in the axial direction.
  • the knife shafts 3 are formed by knife disks 5, which are lined up on shafts 6 and braced against one another by means of spacers 7, i.e. are attached.
  • the spacers 7 determine the distance between the individual cutter disks 5 from one another.
  • One of the knife shafts 3 is additionally provided with a drive gear 8, via which the cutting mechanism is driven by means of a drive motor, not shown in the drawing.
  • the knife shafts 3 are supported on both sides on shaft journals 9 in bearings 10 which are arranged in a housing 11 of the cutting mechanism 1. Both knife shafts 3 have an axial play between a shoulder 12 on the shaft journal 9 and one bearing 10 each.
  • the helical gears 4 of the gears 2 fixed on the knife shafts 3 in the axial direction give rise to axially directed forces on the knife shafts 3 while the cutting mechanism 1 is running, which push the knife disks 5 of both knife shafts 3 against one another or when Reverse movement of the cutting unit 1 move the knife disks 5 away from each other.
  • the play between the lugs 12 and the bearings 10 of the knife shafts 3 enables a slight axial movement of the knife shafts 3, which ensure the described effect in the exemplary embodiment shown.
  • an axial force component arises when the cutting unit 1 is running, the size of which depends on the size of the total transmitted to the gearwheels 2 Force.
  • the size of the force component acting in the axial direction is therefore dependent on the load on the cutting unit 1, that is to say on the quantity of the documents to be fed.
  • the axial force component thus counteracts the cutting forces acting on the cutter shafts 3, which have the tendency to push the cutter disks 5 away from each other, and, with the correct dimensioning of the angle of the helical gears 4 of the gear wheels 2, ensures that the cutting mechanism 1 functions optimally under all operating conditions, ie one flawless cutting process on the cutting edges 13 safely.
  • the axial force components act counter to one another and move the cutter disks 5 of the cutter shafts 3 away from one another.
  • the gap that forms between the knife disks 5 favors the free running of the cutting unit 1 after blocking due to an overload.
  • the described effect according to the invention results depending on the design of the cutting unit 1 under certain conditions, and also when the knife shafts are mounted without play. If the housing 11 of the cutting unit or the knife shafts 3 have an elasticity of a certain size, depending on the load on the cutting unit 1, there is a load-dependent increase in the pressure on the cutting flanks 13 of the knife disks 5. The pressure therefore acts in particular in the case of lighter cutters 1 counteracts the deformation occurring due to the load and also ensures perfect functioning under all operating conditions. It is also the case here that the cutting flanks 13 of the knife disks 5 are relieved during reversing, which favors the free running of a blocked cutting unit.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)

Claims (3)

  1. Dispositif de coupe (1) pour un déchiqueteur de documents à deux arbres de coupe (3) disposés parallèlement entre eux et commandés par des roues dentées à denture hélicoïdale (2), arbres qui portent respectivement un grand nombre de disques porte-lames (5) s'engrenant les uns dans les autres axialement et maintenus par paire en butée, c'est-à-dire en contact de coupe contre leurs flancs de coupe, par une force de grandeur réglable agissant dans le sens de l'axe, caractérisé en ce que sur les deux arbres de coupe (3) sont disposées des roues dentées (2), à denture hélicoïdale, engrenées ensemble et fixées dans le sens axial, de sorte que les composantes de force agissant dans le sens axial et dont la grandeur s'exerce sur les roues dentées (2) en fonction de la charge du dispositif de coupe (1), maintiennent le contact de coupe nécessaire entre les flancs de coupe (13) des disques porte-lames (5) en fonction de la charge.
  2. Dispositif de coupe (1) selon la revendication 1, caractérisé en ce qu'au moins l'un des arbres de coupe (3) est monté avec du jeu axial.
  3. Dispositif de coupe (1) selon la revendication 1, caractérisé en ce que les disques de coupe (5) sont réalisés comme des pièces découpées et sont bloqués les uns contre les autres au moyen de douilles d'écartement (7) sur les axes (6) des arbres de coupe (3).
EP19910105529 1990-04-21 1991-04-08 Dispositif de coupe pour un déchiqueteur de documents Expired - Lifetime EP0453851B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19904012727 DE4012727A1 (de) 1990-04-21 1990-04-21 Schneidwerk fuer einen schriftgutvernichter
DE4012727 1990-04-21

Publications (2)

Publication Number Publication Date
EP0453851A1 EP0453851A1 (fr) 1991-10-30
EP0453851B1 true EP0453851B1 (fr) 1994-06-22

Family

ID=6404798

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910105529 Expired - Lifetime EP0453851B1 (fr) 1990-04-21 1991-04-08 Dispositif de coupe pour un déchiqueteur de documents

Country Status (4)

Country Link
EP (1) EP0453851B1 (fr)
DE (2) DE4012727A1 (fr)
DK (1) DK0453851T3 (fr)
ES (1) ES2055483T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102600944A (zh) * 2011-03-07 2012-07-25 绿友机械集团股份有限公司 小型枝桠粉碎机的刀盘结构

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19746847A1 (de) * 1997-10-23 1999-04-29 Schleicher & Co Int Schneidwerk für einen Dokumentenvernichter
DE19757766A1 (de) * 1997-12-23 1999-06-24 Hermann Schwelling Vorrichtung zur verzögerten Antriebsabschaltung von Aktenvernichter-Schneidwerken
CN102941144B (zh) * 2012-11-20 2015-04-08 东莞精锐电器五金有限公司 单切式碎纸刀具、碎纸机构及碎纸的方法
CN107583737B (zh) * 2017-06-21 2019-05-28 浙江齐嘉消防科技有限公司 一种快捷的切割设备
CN112323922B (zh) * 2020-10-14 2022-08-12 李海斌 一种双向防卡死垃圾处理器
CN118403683B (zh) * 2024-07-02 2024-11-01 江苏省交通工程集团有限公司 一种具有筛分功能的公路桥梁施工用碎石设备

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1286449A (fr) * 1961-04-18 1962-03-02 Fichtel & Sachs Ag Dispositif de transmission à couple progressif par courroie trapézoïdale
US3286574A (en) * 1964-04-22 1966-11-22 Durand Auguste Paul Paper slitting apparatus
DE1810622A1 (de) * 1968-11-23 1970-06-11 Schleicher Co Feinwerktech Antriebsgetriebe fuer ein Papierreiss- oder -Schneidwerk in Kompaktbauweise
US4157671A (en) * 1976-03-11 1979-06-12 Albert Goldhammer Drive for cutting rollers of paper shredding or cutting apparatus
US4330092A (en) * 1979-12-07 1982-05-18 The Perkin-Elmer Corporation In-line shredder apparatus
DE8813569U1 (de) * 1988-10-28 1989-01-12 Wilhelm Dahle Büro-Technik GmbH & Co KG, 8630 Coburg Abstreiferloses Schneidwerk für einen Aktenvernichter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102600944A (zh) * 2011-03-07 2012-07-25 绿友机械集团股份有限公司 小型枝桠粉碎机的刀盘结构

Also Published As

Publication number Publication date
DE4012727A1 (de) 1991-10-24
ES2055483T3 (es) 1994-08-16
DE4012727C2 (fr) 1993-09-09
DE59101977D1 (de) 1994-07-28
EP0453851A1 (fr) 1991-10-30
DK0453851T3 (da) 1994-08-15

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