EP0260636B1 - Stripper for the cutting mechanism of a document shredder - Google Patents

Stripper for the cutting mechanism of a document shredder Download PDF

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Publication number
EP0260636B1
EP0260636B1 EP87113399A EP87113399A EP0260636B1 EP 0260636 B1 EP0260636 B1 EP 0260636B1 EP 87113399 A EP87113399 A EP 87113399A EP 87113399 A EP87113399 A EP 87113399A EP 0260636 B1 EP0260636 B1 EP 0260636B1
Authority
EP
European Patent Office
Prior art keywords
stripper
strippers
pair
cutting
parts
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
EP87113399A
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German (de)
French (fr)
Other versions
EP0260636A2 (en
EP0260636A3 (en
Inventor
Hermann Schwelling
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.)
H S M Pressen GmbH
Original Assignee
H S M Pressen 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 H S M Pressen GmbH filed Critical H S M Pressen GmbH
Publication of EP0260636A2 publication Critical patent/EP0260636A2/en
Publication of EP0260636A3 publication Critical patent/EP0260636A3/en
Application granted granted Critical
Publication of EP0260636B1 publication Critical patent/EP0260636B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B02C18/06—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
    • 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
    • B02C2018/0069—Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents with stripping devices

Definitions

  • the invention relates to wipers for shredder cutting units according to the preamble of claim 1.
  • Such a cutting mechanism for so-called particle cutters is known, for example, from DE-C 3 112 838; Its disadvantage lies primarily in the relatively complex, yet not suitable for high performance, design with regard to the bearing of the wipers.
  • Cutting units with wipers according to DE-A 3 311 331 are also only suitable for small document shredders with a low load capacity, since they each only cover half of the circumference of the cutting rollers and are therefore very unstable. The same applies approximately to the wiper system known from US Pat. No. 4,489,897.
  • a wiper system that is suitable for absorbing high cutting forces is, among other things. still known from DE-C 3 539 503, but here it is disadvantageous that the wipers always have to be bent up laterally during assembly and then straightened out again when they are placed on the knife rollers.
  • a scraper system which is ultimately known from US Pat. No. 4,018,392, because of its one-piece design, is only suitable for cutting rollers which are not made from solid material but are formed by lining up individual cutting disks on a roller core.
  • the object of the present invention is therefore to further simplify the construction of a cutting mechanism of the type known from DE-C 3 112 838, as well as to make it more compact and lighter with the same performance, as well as the function of material intake and the stripping effect in the case of roll advance and - improve return.
  • the drawing shows the cross-section of a cutting unit with the new scraper design largely schematically.
  • the cutting mechanism shown consists in its basic structure known from DE-C 3 112 838 first of all from the core pieces 1 and 2 of the cutting rollers with the disk-like cutting blades 1a and 2a and the approximately half-shell-shaped scrapers 3 and 4 comprising the respective roller cores 1 and 2.
  • scraper head parts 3b, 4b of each scraper pair 3, 4 extend to form a preferably parallel conveyor gap "Fsp" up to approximately the mutually facing inner limits "K" of the roller core 1 or 2 and the scraper head parts 3b, 4b following their respective area in the conveyor gap "Fsp” with at least one nose 7 protruding from the peripheral cutting disks 1a, 2a and a groove 8 extending thereon and in the direction of the respective foot part 3a, 4b, which are provided extends with a preferably curved course again into the interior of the cutting disk circumference 1a, 2a.
  • this configuration prevents excessive pressure forces being exerted on the wiper head parts 3b, 4b on the exit side of the cut material and, on the other hand, results in a good wiping function with roll return for this material. It is also important for this that the depth "T" of the groove 8 is at least the same, but better than that of the transverse grooves (not shown) of the cutting disks 1a, 2a. Ultimately, the additional feed or feed roller for creased paper or the like which has always been required in the prior art.

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

Description

Die Erfindung bezieht sich auf Abstreifer zu Aktenvernichter-Schneidwerken nach dem Oberbegriff des Patentanspruchs 1.The invention relates to wipers for shredder cutting units according to the preamble of claim 1.

Bekannt ist ein derartiges Schneidwerk für sog. Partikelschneider beispielsweise aus der DE-C 3 112 838; sein Nachteil liegt vor allem in der relativ aufwendigen und dennoch nicht für hohe Leistungen geeigneten Bauweise im Hinblick auf die Lagerung der Abstreifer. Ebenfalls nur für gering belastbare Kleinaktenvernichter geeignet sind Schneidwerke mit Abstreifer gemäß der DE-A 3 311 331, da diese die Schneidwalzen jeweils nur zur Hälfte des Umfangs umfassen und somit sehr instabil sind. Gleiches gilt in etwa auch für das aus der US-A 4 489 897 bekannte Abstreifersystem.Such a cutting mechanism for so-called particle cutters is known, for example, from DE-C 3 112 838; Its disadvantage lies primarily in the relatively complex, yet not suitable for high performance, design with regard to the bearing of the wipers. Cutting units with wipers according to DE-A 3 311 331 are also only suitable for small document shredders with a low load capacity, since they each only cover half of the circumference of the cutting rollers and are therefore very unstable. The same applies approximately to the wiper system known from US Pat. No. 4,489,897.

Ein für die Aufnahme an sich hoher Schneidkräfte geeignetes Abstreifersystem ist u.a. noch aus der DE-C 3 539 503 bekannt, jedoch ist hier von Nachteil, daß die Abstreifer bei der Montage immer erst seitlich aufgebogen und dann wieder zurückgerichtet werden müssen, wenn sie auf die Messerwalzen aufgesetzt werden. Ein letztlich noch aus der US-A 4 018 392 bekanntes Abstreifersystem ist aufgrund seiner einstückigen Ausbildung nur für Schneidwalzen geeignet, die nicht aus Vollmaterial hergestellt, sondern durch Aufreihung einzelner Schneidscheiben auf einen Walzenkern gebildet sind.A wiper system that is suitable for absorbing high cutting forces is, among other things. still known from DE-C 3 539 503, but here it is disadvantageous that the wipers always have to be bent up laterally during assembly and then straightened out again when they are placed on the knife rollers. A scraper system which is ultimately known from US Pat. No. 4,018,392, because of its one-piece design, is only suitable for cutting rollers which are not made from solid material but are formed by lining up individual cutting disks on a roller core.

Aufgabe der vorliegenden Erfindung ist es daher, ein Schneidwerk der aus der DE-C 3 112 838 bekannten Art baulich noch weitergehend zu vereinfachen, sowie bei gleicher Leistung noch kompakter und leichter zu gestalten sowie die Funktion von Materialeinzug und die Abstreifwirkung bei Walzenvor- und -rücklauf zu verbessern.The object of the present invention is therefore to further simplify the construction of a cutting mechanism of the type known from DE-C 3 112 838, as well as to make it more compact and lighter with the same performance, as well as the function of material intake and the stripping effect in the case of roll advance and - improve return.

Gelöst wird diese Gesamtaufgabe durch die im Hauptanspruch angegebenen baulichen Mittel und Maßnahmen; weitere erfindungsgemäß wesentliche Merkmale sind in den Unteransprüchen enthalten.This overall task is solved by the structural means and measures specified in the main claim; further features essential to the invention are contained in the subclaims.

Die Zeichnung zeigt weitestgehend schematisch den Querschnitt eines Schneidwerks mit der neuen Abstreiferausbildung.The drawing shows the cross-section of a cutting unit with the new scraper design largely schematically.

Das dargestellte Schneidwerk besteht in seinem aus der DE-C 3 112 838 bekannten Grundaufbau zunächst aus den Kernstücken 1 bzw. 2 der Schneidwalzen mit den scheibenartigen Schneidmessern 1a und 2a sowie den etwa halbschalenförmig die jeweiligen Walzenkerne 1 bzw. 2 umfassenden Abstreifer 3 und 4.The cutting mechanism shown consists in its basic structure known from DE-C 3 112 838 first of all from the core pieces 1 and 2 of the cutting rollers with the disk-like cutting blades 1a and 2a and the approximately half-shell-shaped scrapers 3 and 4 comprising the respective roller cores 1 and 2.

Zur Lösung der eingangs gestellten Aufgabe ist nun zunächst einmal vorgesehen, bauliche Kompaktheit und Einsparung von Material bzw. Reduzierung des Gewichts dadurch zu erzielen, daß innerhalb jedes der Abstreiferpaare 3, 4 die Fußteile 3a, 4a einander soweit genähert sind, daß eine dort befindliche, zusätzliche dritte Lagerstange 6, sowohl für die eine 3 als auch für die andere Hälfte 4 des jeweiligen Abstreiferpaares 3, 4 als gemeinsame Lagerstange 6 dient, wobei vorzugsweise zudem noch die Abstreifer 3, 4 jedes Paares im Fußbereich 3a, 4a aneinander und/oder am jeweiligen Walzenkern 1 bzw. 2 anliegen und die gemeinsame dritte Lagerstange 6 jedes Abstreiferpaares 3, 4 in eine schalen- bzw. muldenförmige Aussparung 9 jedes der Abstreiferteile 3 bzw. 4 eingelegt ist. In welcher Weise bei Walzenvor- oder -rücklauf die Kopfteile 3b bzw. 4b der Abstreifer 3 bzw. 4 nun auch belastet werden, kommen jeweils immer eine Stange 5 und 6 unmittelbar zum Tragen, ja es werden sogar auch noch Kräfte von der anderen Stange 5 zusätzlich aufgenommen.To solve the problem set out at the outset, it is initially intended to achieve structural compactness and savings in material or reduction in weight by virtue of the fact that within each of the scraper pairs 3, 4, the foot parts 3a, 4a are so close to one another that a Additional third bearing rod 6, both for the one 3 and for the other half 4 of the respective wiper pair 3, 4, serves as a common bearing rod 6, wherein preferably also the wipers 3, 4 of each pair in the foot region 3a, 4a to one another and / or on The respective roller core 1 or 2 abut and the common third bearing rod 6 of each pair of wipers 3, 4 is inserted into a bowl-shaped or trough-shaped recess 9 of each of the wiper parts 3 and 4. In which way the head parts 3b and 4b of the wipers 3 and 4 are now also loaded when the rollers advance or reverse, one rod 5 and 6 always comes into play immediately, and even forces from the other rod 5 even come into play additionally added.

Als weiteres wichtiges Merkmal ist anzusehen, daß sich die Abstreiferkopfteile 3b, 4b jedes Abstreiferpaares 3, 4 unter Bildung eines vorzugsweise parallelen Förderspaltes "Fsp" bis annähernd an die einander zugekehrten, inneren Begrenzungen "K" des Walzenkernes 1 bzw. 2 erstrecken und die Abstreiferkopfteile 3b, 4b im Anschluß an ihren jeweils im Förderspalt " Fsp " verlaufenden Bereich mit mindestens einer aus dem Umfangschneidscheiben 1 a, 2a herausragenden Nase 7 und einer daran und in Richtung auf das jeweilige Fußteil 3a, 4b hin verlaufenden Kehlung 8 versehen sind, die sich mit vorzugsweise geschwungenem Verlauf wieder bis ins Innere des Schneidscheibenumfangs 1a, 2a erstreckt. Diese Ausgestaltung verhindert einerseits des Entstehen zu großer Druckkräfte auf die Abstreiferkopfteile 3b, 4b an der Austrittsseite des geschnittenen Materials und ergibt andererseits eine gute Abstreiffunktion bei Walzenrücklauf für dieses Material. Wichtig hierfür ist noch, daß die Tiefe " T " der Kehlung 8 zumindest gleich, besser jedoch tiefer als die der Quernuten ( nicht dargestellt ) der Schneidscheiben la, 2a ist. Letztlich kann die beim Stand der Technik bislang stets erforderliche, zusätzliche Einzugs- bzw. Zuführwalze für Kniillpapier o.dgl. noch dadurch entfallen, daß die auf der Einzugsseite " E " liegende Nase(n) 7a an oder kurz vor " y " dem Außendurchmesser der Schneidscheiben 1a, 2a endet, da durch diese Lösung erstens der Einzugswinkel A1 auf der Zuführseite "E" wesentlich größer als derjenige A2 auf der Materialaustrittsseite wird und das Knüllpapier somit mit einem größeren Bereich des rauhen Schneidscheibenumfangs in Berührung kommt und somit genau so sicher eingezogen wird, wie durch eine gesonderte Einzugswalze.Another important feature is that the scraper head parts 3b, 4b of each scraper pair 3, 4 extend to form a preferably parallel conveyor gap "Fsp" up to approximately the mutually facing inner limits "K" of the roller core 1 or 2 and the scraper head parts 3b, 4b following their respective area in the conveyor gap "Fsp" with at least one nose 7 protruding from the peripheral cutting disks 1a, 2a and a groove 8 extending thereon and in the direction of the respective foot part 3a, 4b, which are provided extends with a preferably curved course again into the interior of the cutting disk circumference 1a, 2a. On the one hand, this configuration prevents excessive pressure forces being exerted on the wiper head parts 3b, 4b on the exit side of the cut material and, on the other hand, results in a good wiping function with roll return for this material. It is also important for this that the depth "T" of the groove 8 is at least the same, but better than that of the transverse grooves (not shown) of the cutting disks 1a, 2a. Ultimately, the additional feed or feed roller for creased paper or the like which has always been required in the prior art. this also eliminates the fact that the nose (s) 7a lying on the feed side "E" ends at or just before "y" the outside diameter of the cutting disks 1a, 2a, since this solution firstly means that the feed angle A 1 on the feed side "E" is significant becomes larger than that A 2 on the material exit side and the crumpled paper thus comes into contact with a larger area of the rough circumference of the cutting disc and is thus drawn in just as safely as by a separate feed roller.

Claims (7)

1. Strippers for the cutting mechanism of paper shredders which predominantly display blade rollers (1, a and 2, 2a), which are machined in one piece of solid material and in which the strippers (3, 4) each time lie in mirror image one to the other as pairs as well as a respective stripper pair (3, 4) is associated with each blade roller (1, 1a or 2, 2a) and at least two rods (5), which are arranged at a mutual spacing (4) one from the other, connect the one bearing plate with the other and which penetrate the stripper foot parts (3a, 4a), serve for the mounting of the strippers (3, 4) always aligned in each row in axial direction, characterised thereby, that the foot parts (3a, 4a) within each of the stripper pairs (3, 4) are brought so close together that an additional third bearing rod (6) disposed there serves as a common bearing rod (6) for the one half (3) as well as also for the other half (4) of the respective stripper pair (3, 4).
2. Strippers according to claim 1, characterised thereby, that the stripper head parts (3b, 4b) of each stripper pair (3, 4) extend nearly to the mutually facing inner boundaries (K) of the roller core (1 or 2) while forming a preferably parallel conveying gap (Fsp).
3. Strippers according to the claims 1 and 2, characterised thereby, that the stripper head parts (3b, 4b) adjoining their respective region extending in the conveying gap (Fsp) are provided with at least one lug (7) projecting out from the periphery of the cutting discs (1 a, 2a) and with a throat (8), which extends thereat and in direction towards the respective foot parts (3a, 4a) and which with preferably swung course again extends into the interior of the cutting disc periphery (1 a, 2a).
4. Strippers according to claim 3, characterised thereby, that the or each lug (7a) lying at the intake side (E) ends at or shortly in front (y) of the external diameter of the cutting discs (1 a, 2a).
5. Strippers according to the claims 1 to 4, characterised thereby, that the depth (T) of the throat (8) is at least equal to, better however deeper than that of the transverse grooves (not illustrated) of the cutting discs (1 a, 2a)
6. Strippers according to one or more of the preceding claims, characterised thereby, that the strippers (3, 4) of each pair in the foot region (3a, 4a) lie (line x) each against the other and/or against the respective roller core (1 or 2).
7. Strippers according to one or more of the preceding claims, characterised thereby, that the common bearing rod (6) of each stripper pair (3, 4) is laid into a bowl-shaped or trough-shaped recess (9) of each of the stripper parts (3 or 4).
EP87113399A 1986-09-15 1987-09-14 Stripper for the cutting mechanism of a document shredder Expired - Lifetime EP0260636B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3631362 1986-09-15
DE19863631362 DE3631362A1 (en) 1986-09-15 1986-09-15 SCRAPER FOR THE CUTTERS OF DOCUMENT shredders

Publications (3)

Publication Number Publication Date
EP0260636A2 EP0260636A2 (en) 1988-03-23
EP0260636A3 EP0260636A3 (en) 1989-05-31
EP0260636B1 true EP0260636B1 (en) 1990-12-05

Family

ID=6309620

Family Applications (1)

Application Number Title Priority Date Filing Date
EP87113399A Expired - Lifetime EP0260636B1 (en) 1986-09-15 1987-09-14 Stripper for the cutting mechanism of a document shredder

Country Status (3)

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US (1) US4809916A (en)
EP (1) EP0260636B1 (en)
DE (1) DE3631362A1 (en)

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261177B (en) * 1991-10-10 1995-03-29 Ofrex Group Holdings Plc Improvements relating to document shredding machines
EP0616850B1 (en) * 1993-03-22 1997-07-23 Hermann Schwelling Document shredder
DE4423350C2 (en) * 1993-07-20 1996-09-05 Hermann Schwelling Scraper system for document shredders
US5676321A (en) * 1995-04-03 1997-10-14 Fellowes Mfg. Co. Cutting disk
US5636801A (en) * 1995-08-02 1997-06-10 Fellowes Mfg. Co. One piece molded stripper for shredders
US5655725A (en) * 1995-08-24 1997-08-12 Fellowes Manufacturing Co. Retaining plate for gearing
US5829697A (en) * 1995-08-24 1998-11-03 Fellowes Manufacturing Company Support for cylinders in a paper shredder
DE19610048A1 (en) * 1996-03-14 1997-09-18 Schleicher & Co Int Document shredder
DE19712661C2 (en) * 1997-03-26 2003-04-10 Schleicher & Co Int Ag Scraper for a cutter of a document shredder
US5954280A (en) * 1998-05-12 1999-09-21 Fellowes Manufacturing Company Top blocker for a paper shredder
US7100854B2 (en) * 2004-03-18 2006-09-05 Helen Of Troy Limited Chopper
DE102012100681B4 (en) 2012-01-27 2022-09-01 Hermann Schwelling Document shredder with turbo function
EP3215273B8 (en) 2014-11-07 2019-07-31 Dirk Jaresch Destruction of printed paper

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2338654C2 (en) * 1973-07-31 1986-04-10 Adolf 7460 Balingen Ehinger jun. Shredding device, in particular document shredders
SU517676A1 (en) * 1975-01-06 1976-06-15 Курский Филиал Всесоюзного Научно-Исследовательского Института Оргтехники Paper shredder
US4018392A (en) * 1975-12-22 1977-04-19 Wagner John W Shredding machine
DE3112838C2 (en) * 1981-03-31 1985-09-12 Hermann 7777 Salem Schwelling Cutting unit for document shredders
FR2502980B1 (en) * 1981-03-31 1986-05-16 Schwelling Hermann CUTTING MECHANISM FOR DOCUMENT DESTROYER
US4489897A (en) * 1983-03-02 1984-12-25 General Binding Corporation Apparatus for shredding documents
DE3311331C2 (en) * 1983-03-29 1986-10-23 Hermann 7777 Salem Schwelling Scraper system for the cutting or tearing rollers of document shredders
DE8434402U1 (en) * 1984-11-23 1985-04-25 Wilhelm Dahle Büro- und Zeichengerätefabrik, 8630 Coburg CUTTING DEVICE FOR A SHREDDER
DE3539503A1 (en) * 1984-11-23 1986-06-05 Wilhelm Dahle Büro- und Zeichengerätefabrik, 8630 Coburg Cutting mechanism for a document shredder

Also Published As

Publication number Publication date
DE3631362A1 (en) 1988-03-24
EP0260636A2 (en) 1988-03-23
US4809916A (en) 1989-03-07
EP0260636A3 (en) 1989-05-31
DE3631362C2 (en) 1989-06-29

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