EP0447854A2 - Dispositif de coupe pour destructeur de documents - Google Patents

Dispositif de coupe pour destructeur de documents Download PDF

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Publication number
EP0447854A2
EP0447854A2 EP91102991A EP91102991A EP0447854A2 EP 0447854 A2 EP0447854 A2 EP 0447854A2 EP 91102991 A EP91102991 A EP 91102991A EP 91102991 A EP91102991 A EP 91102991A EP 0447854 A2 EP0447854 A2 EP 0447854A2
Authority
EP
European Patent Office
Prior art keywords
cutting
passage
distance
cutting device
roller
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.)
Granted
Application number
EP91102991A
Other languages
German (de)
English (en)
Other versions
EP0447854B1 (fr
EP0447854A3 (en
Inventor
Hartmut Stangenberg
Rolf Gasteier
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.)
Schleicher and Co International AG
Original Assignee
Schleicher and Co International AG
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=6402480&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0447854(A2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Schleicher and Co International AG filed Critical Schleicher and Co International AG
Publication of EP0447854A2 publication Critical patent/EP0447854A2/fr
Publication of EP0447854A3 publication Critical patent/EP0447854A3/de
Application granted granted Critical
Publication of EP0447854B1 publication Critical patent/EP0447854B1/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
    • B02C18/06—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
    • 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
    • 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

Definitions

  • the invention relates to a cutting device for a document shredder according to the preamble of claim 1.
  • a document shredder is to be understood here as a device which is primarily intended to cut documents and other flat material, in particular paper, into strips which are as illegible as possible. It can also be used to cut other objects.
  • a cutting device of the type mentioned has become known from DE-C-19 53 681. It creates a so-called torsion cut, ie it cuts the documents into narrow strips that are more or less strong Assume a screw shape because the two edges of the strip are deflected in different directions after the cut.
  • the cutting unit according to DE-C-19 53 681 has the advantage that even when cutting layers of several papers in the passage, which is formed between two pairs of cutting discs, there is sufficient space for the strip to be there can walk freely.
  • a problem is a relatively large cutting disc height above the roller surface, because this makes the cutting discs sensitive to breakage and increases the roller diameter, the roller spacing and thus space and construction costs. It can also be observed that strips adhere to the cutting disks and are taken with them, so that wipers are usually required to prevent them from being wrapped around the cutting rollers.
  • the object of the invention is to improve a cutting unit of the type mentioned in such a way that with good cutting results and as little energy expenditure as possible and low risk of breakage, a strip pass is possible without the tendency of the strips to get caught on the rollers.
  • the narrow trapezoidal shape of the passage allows the strip to take almost any position. Its tendency to form screws is reduced and also in the event that material is cut which tends to expand along the edges during cutting, the cutting edges thus corrugated can pass through the passage unhindered.
  • the compact trapezoidal shape can be further defined on the basis of various criteria which are specified in the subclaims. However, due to the different designs, they are also to be understood as alternative, although a particularly advantageous embodiment can use them in combination, since they are not mutually exclusive. It is also important to generously round off the transitions between the cutting and back flanks of each cutting disc and the roller surface. It has been found that this significantly reduces the tendency for the strips to jam, although this was not initially believed because it somewhat reduces the largest diagonal dimension in the passageway.
  • FIG. 1 shows a cutting mechanism 11 with two cutting rollers 12, 13, each of which consists of a roller body 16 with cutting disks 14, 15 integrally formed thereon.
  • the roller bodies have a bearing journal 18 on each side, which is mounted in bearings 19 on a machine frame 20 of a document shredder which is not shown in further details.
  • the opposite drive, synchronized by a pair of gearwheels, of both cutting rollers takes place in opposite directions of rotation.
  • Fig. 1 it is indicated that the cutting rollers are axially supported against each other via a corresponding axially elastic bearing design of the bearing block 21 designed as a common bearing insert, so that they run against each other with as little friction as possible, but also result in a good cutting profile and in the event of an overload can yield axially.
  • the cutting disks 14, 15 are annular flange-like, preferably hardened structures projecting over the roller surface 17 of the continuous roller body 16, which have a cutting edge 22 running essentially in a radial plane and a back flank 23 running at an angle f with respect to this or a radial plane.
  • the flanks 22, 23 are connected to one another by a cylindrical annular surface 24 forming the outer circumference of the cutting disk, which has a relatively small width s in the axial direction.
  • the cutting disks are made in one piece with the roller body. However, they could also be lined up on a shaft in the form of individual disks if this is cheaper for manufacturing reasons.
  • the transition between the back flanks 23 and the cutting flanks 22 and the roller surface 17 is provided with generous fillets 45, namely with a radius r that is greater than one fifth of the cutting disc height h above the roller surface 17 (preferably, as in the exemplary embodiment, about a third of h ; see Fig. 2).
  • the cutting flanks 22 of the cutting disks 14 of a cutting roller 12 each abut the corresponding cutting flanks 22 of the cutting disks 15 of the cutting roller 13, since these are in the same axial direction on both cutting rollers Distance b are arranged from each other.
  • the cutting flanks 22 form a circumferential circular cutting edge 25 between them and the annular surface 24, which is determining for the distance dimension b .
  • the cutting surface 22 runs essentially radially, but could also be designed differently if a low-friction engagement of the two cutting edge regions is ensured. For example, an even more generous fillet would be possible.
  • This passage has a compact trapezoidal shape with corners rounded by the fillets 45, ie it approaches an equilateral trapezoid rather than an elongated strip-like one. This is achieved by the relatively steep course of the back flanks 23 together with a moderate cutting disc height h .
  • the cutting rollers 12, 13 are arranged at an axial distance A from one another which is smaller than their outer diameter Da . This creates a lenticular overlap zone between the cutting disks, the largest dimension of which in the connecting plane of the two cutting disc axes 30 shown in FIG. 2 has the dimension u .
  • the dimensions of the passage are also to be understood in this level, since it has its narrowest point in this level and expands in front of and behind it.
  • the cutting disc height h can be approximately 2.5 mm with an axial cutting edge distance b of 4 mm.
  • a center distance A of 23.5 mm there is an overlap u of 1.5 mm and thus a radial dimension d of the passage of 2.5 mm, while the dimension a , ie the smallest distance between the back flanks 23 in the passage 29 2, 6 mm.
  • This small ring surface also facilitates the cutting work by increasing the surface pressure in the cutting area.
  • the relatively small width s of the ring section 24 ensures that no pronounced corners are formed in the passage, which could give it a Z-shape.
  • the dimension ratios apply, which are calculated from the previously specified data leave, also as particularly advantageous. Deviating from this, however, the values can differ.
  • the flank angle can be selected between 20 and 35 ° without, on the one hand, increasing the risk of breakage too much or restricting the passage 29 too much.
  • the favorable ratio between the outer diameter Da and the cutting disc distance b of approximately 6: 1 can be up to approximately 10: 1 and the width s of the ring surface 24 on the cutting disc circumference, which in the exemplary embodiment is approximately 8%, can be between 5% and 20% of the Cutting disc height and a sixth to a thirtieth, preferably a twentieth of the cutting edge distance b .
  • a small ratio between the cutting disc height h (cantilevered above the roller surface) is also advantageous and should be less than 70% of the cutting edge distance b .
  • the radial dimension d of the passage should be smaller or approximately the same size as the axial cutting edge distance b . Based on the transverse distance a , ie the distance between the back flanks, these radial dimensions d should be less than five times and as small as possible twice as a .
  • the overlap dimension u should, based on the cutting disc height h , be less than two thirds of this or, based on the axial cutting edge distance b or the radial dimension d of the passage, less than half of these values.
  • the function of the cutting unit is as follows: An input sheet or sheet layer or a web or web layer (with continuous loading) runs, possibly guided by walls of an insertion slot, into the overlap area between the two cutting rollers, ie vertical in the drawing plane. It is gripped by the cutting rollers which run in opposite directions, ie in the same direction, whereby the ring surface 24 could be corrugated if this should be necessary for transport reasons. It is therefore pulled through between the two rollers, and it is cut in the manner of a scissor cut even before the middle plane containing the two axes 30 at the beginning of the lenticular overlap region by the cooperating cutting edges 24 of each pair of cutting disks.
  • the cut is made over the entire width at the same time, so that the material is held taut between the individual cut edges and is thus cut or torn like a cut even with somewhat blunt and not quite adjacent cutting edges. This is supported by the fact that after the cutting process, the ring surfaces 24, which adjoin the respective cutting line, move in opposite directions, so that the material would be separated because of the large stretching that would then occur.
  • the resulting paper strip 28 lies in the passage 29, when it has reached the center plane of the two cutting rollers, obliquely with respect to its orientation (corresponding to the parting plane 35) assumed before the cutting process, as shown in FIG. 2, so that overall there is a slight helical rotation of the resulting strip results in what has led to the name "torsion cut” for this roller formation.
  • this helical tendency to turn is relatively small in the cutting device according to the invention, ie the "pitch" of the resulting screw is very large.
  • the strip 28 could also lie in a different position without getting stuck between the walls of the passage.
  • the generous fillets 45 also contribute to this. Even a roughened or wavy edge cannot lead to a jam. Above all, regardless of its remaining screw shape, which depends on the material properties of the comminution material, the strip can lie in almost any rotational position without striking a passage wall.
  • the cutting device according to the invention does not require a scraper. If one is provided, only in the case of particularly critical materials that tend to stick to the cutting rollers for other reasons.
  • the compact shape of the passage could also be maintained or even further perfected if the passage, in contrast to its illustrated trapezoidal shape, was more adapted to a rectangular or, better still, circular or elongated hole shape.
  • the roller surface 17, which was cylindrical between the cutting disks could be given a rounded shape 36, indicated by dash-dotted lines in FIG. 2, without being affected by the strength of the cutting disks.
  • the strip could then move freely through the passage by more than 60 °.
  • the generous fillets 45 would almost merge into a single overall round.
  • a good rounding of the space forming the passage can also lead to the advantages of the invention, regardless of the relative dimensioning of this space.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Pulverization Processes (AREA)
EP91102991A 1990-03-17 1991-02-28 Dispositif de coupe pour destructeur de documents Expired - Lifetime EP0447854B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4008659 1990-03-17
DE4008659A DE4008659A1 (de) 1990-03-17 1990-03-17 Schneidwerk fuer einen dokumentenvernichter

Publications (3)

Publication Number Publication Date
EP0447854A2 true EP0447854A2 (fr) 1991-09-25
EP0447854A3 EP0447854A3 (en) 1991-11-06
EP0447854B1 EP0447854B1 (fr) 1995-01-11

Family

ID=6402480

Family Applications (1)

Application Number Title Priority Date Filing Date
EP91102991A Expired - Lifetime EP0447854B1 (fr) 1990-03-17 1991-02-28 Dispositif de coupe pour destructeur de documents

Country Status (4)

Country Link
US (1) US5207392A (fr)
EP (1) EP0447854B1 (fr)
JP (1) JP3225488B2 (fr)
DE (2) DE4008659A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0928222B2 (fr) † 1995-09-12 2007-03-21 M&J Industries A/S Broyeuse

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
USRE39948E1 (en) * 1993-06-16 2007-12-25 Jwc Environmental Seal bearing assembly for use in a solid waste comminutor
US5354004A (en) * 1993-06-16 1994-10-11 Disposable Waste Systems, Inc. Solid waste comminutor
US5593100A (en) * 1993-06-16 1997-01-14 Disposable Waste Systems, Inc. Solid waste comminutor with removable bearing assembly and improved side rails
USRE37550E1 (en) * 1993-06-16 2002-02-19 Disposable Waste Systems, Inc. Solid waste comminutor with removable bearing assembly and improved side rails
US7040559B2 (en) 2004-04-02 2006-05-09 Fellowes Inc. Shredder with lock for on/off switch
US8356764B2 (en) * 2005-06-30 2013-01-22 Alcatel Lucent Continuous flow micro-crusher
CN2915259Y (zh) 2006-07-14 2007-06-27 上海震旦办公设备有限公司 碎纸机触碰安全装置
US8008812B2 (en) 2006-07-14 2011-08-30 Aurora Office Equipment Co., Ltd. Paper shredder control system responsive to touch-sensitive element
US7637448B2 (en) 2007-02-21 2009-12-29 Fellowes, Inc. Plastic center shredder disc
CN201239643Y (zh) 2008-08-06 2009-05-20 上海震旦办公设备有限公司 不择纸的全自动碎纸机
CN201244502Y (zh) 2008-08-19 2009-05-27 上海震旦办公设备有限公司 自动碎纸机可剃钉结构
CN101543800A (zh) 2009-05-07 2009-09-30 上海震旦办公设备有限公司 碎纸机防卡纸保护装置
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
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
CN103143417B (zh) * 2013-02-26 2016-04-13 东莞精锐电器五金有限公司 具有单切式纵向碎纸机构的连环刀碎纸机
DE102013106296A1 (de) * 2013-06-18 2014-12-18 Claas Selbstfahrende Erntemaschinen Gmbh Nachzerkleinerungsvorrichtung

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1512929A (en) * 1921-12-21 1924-10-28 Himoff Max Tobacco-cutting machine
DE863862C (de) * 1950-04-09 1953-01-19 Wilhelm Kemper Fa Strohschneidemaschine
DE1943648A1 (de) * 1969-08-28 1971-03-11 Bohmter Maschf Maschine zum Granulieren von Sperrmuell bzw. sperrigen Abfaellen jeglicher Art,wie Behaelter,Flaschen od.dgl.
DE1953681C3 (de) * 1969-10-24 1973-01-25 Schleicher Co Feinwerktech Geraet zum Zerschneiden von Schriftstuecken
US3960335A (en) * 1971-12-24 1976-06-01 Wilhelm Haberle Comminution device for scrap plastics
JPS5376465A (en) * 1976-12-17 1978-07-06 Kobe Steel Ltd Crusher
GB1552269A (en) * 1977-04-07 1979-09-12 Brierley Z Shredder
DE2730188A1 (de) * 1977-07-04 1979-01-25 Moco Masch & Apparatebau Zerkleinerungsmaschine
DE2827544A1 (de) * 1978-06-23 1980-01-17 Moco Masch & Apparatebau Zerkleinerungsanlage
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
EP0928222B2 (fr) † 1995-09-12 2007-03-21 M&J Industries A/S Broyeuse

Also Published As

Publication number Publication date
JP3225488B2 (ja) 2001-11-05
US5207392A (en) 1993-05-04
JPH0568906A (ja) 1993-03-23
DE4008659A1 (de) 1991-09-19
DE59104192D1 (de) 1995-02-23
EP0447854B1 (fr) 1995-01-11
EP0447854A3 (en) 1991-11-06

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