EP0010681B1 - Appareil pour le découpage ou le broyage de papier, carton, microfilms ou analogues - Google Patents

Appareil pour le découpage ou le broyage de papier, carton, microfilms ou analogues Download PDF

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Publication number
EP0010681B1
EP0010681B1 EP19790103990 EP79103990A EP0010681B1 EP 0010681 B1 EP0010681 B1 EP 0010681B1 EP 19790103990 EP19790103990 EP 19790103990 EP 79103990 A EP79103990 A EP 79103990A EP 0010681 B1 EP0010681 B1 EP 0010681B1
Authority
EP
European Patent Office
Prior art keywords
cutting
cutting mechanism
driving
driving element
drive
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
Application number
EP19790103990
Other languages
German (de)
English (en)
Other versions
EP0010681A1 (fr
Inventor
Günter Trautmann
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.)
Fleischmann Friedrich M
Original Assignee
Fleischmann Friedrich M
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
Priority claimed from DE19782845447 external-priority patent/DE2845447A1/de
Priority claimed from DE19782849095 external-priority patent/DE2849095A1/de
Priority claimed from DE19792913417 external-priority patent/DE2913417A1/de
Priority claimed from DE19792930655 external-priority patent/DE2930655A1/de
Application filed by Fleischmann Friedrich M filed Critical Fleischmann Friedrich M
Priority to AT79103990T priority Critical patent/ATE846T1/de
Publication of EP0010681A1 publication Critical patent/EP0010681A1/fr
Application granted granted Critical
Publication of EP0010681B1 publication Critical patent/EP0010681B1/fr
Expired 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
    • B02C18/14—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers
    • B02C18/148—Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives within horizontal containers specially adapted for disintegrating plastics, e.g. cinematographic films
    • 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
    • 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
    • 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
    • B02C2018/0038—Motor drives
    • 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
    • B02C2018/0046—Shape or construction of frames, housings or casings

Definitions

  • the invention relates to a device for cutting or shredding paper, cardboard, microfilms or the like with a cutting device and a drive for the cutting device.
  • Cutting or shredding devices for microfilms, paper, cardboard and the like are known in various versions as so-called document shredders. For reasons of confidentiality, information carriers must be cut or shredded in due time in office and data technology. For this purpose, these devices are offered individually in different sizes in accordance with the requirements with regard to the desired strip width or the size of the chips. In general, the known devices are set to a single cutting width. A separate overall device had to be kept available for each shredding process, which leads to space problems and high acquisition costs.
  • An electrical paper tearing machine is also known (DE-A-2645284) which is provided with two or more integrated knife roller pairs of different cutting widths.
  • a separate insertion slot is provided for the knife rollers with a large cutting width and for the knife rollers with a small cutting width, and a switch for the drive motor to the various knife rollers.
  • the integrated arrangement of various knife rollers results in a high level of design effort, which also leads to high acquisition costs.
  • the known document shredders are thus consistently limited as a complete unit to one or two cutting widths once determined, which result from the distances from cutting knife to cutting knife.
  • the invention has for its object to provide a device for cutting or shredding of the type described in the introduction, which in a simple, cost-saving manner enables adaptation to the required cutting width, is simple in construction and is easy to maintain and, if necessary, easy to repair .
  • the drive element is designed as an independent unit which can be connected to a supporting frame with a waste container and has a drive motor, switching element and drive pinion driven by the drive motor, that at least one cutting unit with a certain cutting width exists knife rollers, drive gear and scraper device is provided as an independent unit that can be freely connected and exchanged with the drive element, that guide means and locking means are provided for the precisely defined connection between the drive element and cutting device, the drive pinion of the drive element with the drive gear of the The cutting unit is in a force-locking operative connection.
  • the drive of the device and the cutting device are designed as complete, separate units, the cutting device being designed in the manner of a cassette, there is the possibility of exchanging cutting devices with different cutting widths with one hand and thereby changing the device to a different cutting width quick changeover.
  • the drive element as the basic element is an extremely inexpensive and one-time purchase because of the much lower manufacturing effort. Tailored to the respective needs, cutting units with different cutting widths can be provided immediately or later.
  • the drive unit or the cutting unit has pins which engage in a form-fitting manner in the associated guide and centering openings of the respective other element.
  • the locking means are designed as automatically latching pawls which can be released by hand.
  • a further improvement, in particular noise insulation, results when, according to a further embodiment of the invention, the drive element is connected to the support frame via rubber bearings and is held in a position-oriented manner by holes in the support frame.
  • the transport costs for such a device are reduced and the assembly is made easier if, according to a preferred exemplary embodiment of the invention, the supporting frame and the independent waste container are each designed to be pluggable from individual parts.
  • the support frame serves to receive the drive element and a cutting unit and in the lower frame opening, the waste container can be inserted in a positive manner.
  • a storage surface that can be folded and / or retracted on the back of the support frame and supported with a support bracket for receiving endlessly folded paper, and a feed bracket for feeding the paper into the cutting unit to attach.
  • the scraper device of the cutting unit is advantageously formed from four similar comb elements, two of which completely enclose the core of a knife roller, such that segments of individual knives of the same size protrude freely on the knife roller on both sides and that the comb elements on the end face intervene in a form-fitting manner with an attachment in each case in an associated opening of a bearing plate for the knife roller and that the ends of the comb elements are also designed such that respective bearing bushes of the knife rollers arranged in the bearing plate are held against rotation.
  • the design according to the invention results in constant precision and cost-effective production, as well as simple and quick assembly.
  • a drive unit 1 which has, for example, a plastic housing (FIG. 8), contains an electric drive motor, a transmission, capacitors, switches, a device socket and the associated electrical wiring.
  • a receiving opening 2 serves to receive the cutting unit.
  • the drive unit 1 has its constant place on a support frame 3, which, as will be explained in more detail later, can be put together from individual parts in a few simple steps.
  • the drive unit 1 is connected to the support frame 3 via rubber bearings 4, which largely reduces the transmission of noise.
  • the support frame 3 is provided with Geienkrofien 5.
  • a waste container 6 consists, as will also be explained later, of simple and easily pluggable individual parts. The waste container 6 is placed in the support frame 3 and fixed by appropriate training of its bottom.
  • the waste container 6 for throwing in paper waste or the like is accessible at all times.
  • FIG. 2 shows a device according to FIG. 1 provided, a cutter 8 is inserted in the receiving opening 2.
  • both the drive unit 1 and the cutting unit 8 have receiving pins 9 which snap into corresponding guide openings 9 'of the other part and thereby fix the relative position exactly.
  • FIG. 4 shows the exemplary embodiment according to FIG. 3 with the housing partially broken away. It can be seen that the drive unit 1 has a drive pinion 12 which is operatively connected to a gear 11 of the cutting unit 8. Due to the precisely fixed relative position, the gearbox runs quietly.
  • pawls 1'3 are attached on both sides, which engage automatically, in the exemplary embodiment shown, against the action of a spring, on the locking pin 10. As a result, the cutting unit 8 is secured against inadvertent sliding out. The locking pawls 1'3 must be released by finger pressure when removing the cutting unit 8.
  • FIG. 5 shows a further exemplary embodiment of a drive unit 1 in a perspective view. Key switches 14 can be seen. 3 and 4, the drive element 1 has four centering pins 15 which engage in centering openings 24 of a cutting mechanism 8 shown in FIGS. 6 and 7.
  • the drive mechanism of the drive unit 1 is provided with an intermediate drive pinion 16 and an intermediate drive wheel 17.
  • the housing of the drive unit 1 expediently has support strips 19 on both sides.
  • the cutting mechanism 8 can be seen from FIGS. 6 and 7, the illustration in FIG. 7 being rotated by 180 ° with respect to the illustration in FIG. 6.
  • the cutting unit 8 designed as an independent unit, has cutting knife rollers in its interior, which will be explained in more detail later.
  • the housing of the cutting unit 8 is provided with support strips 21 which, when assembled, are aligned with the support strips 19 of the drive unit 1.
  • a feed opening 18 is provided for feeding the material to be shredded to the cutting knife rollers.
  • the cutting unit 8 has pawls 22 which can be disengaged via the clamping lever 23, as will be explained in more detail later.
  • FIG. 8 shows the chassis of the drive unit 1, without the housing, in a top view.
  • Bearing plates 31, 32 and 33 designed as stamped parts are firmly screwed to four square spacer rods 34, the distance in the gear space between the bearing plates 32 and 33 being determined by spacer tubes 35.
  • An electric drive motor 36 is screwed onto the bearing plate 32, the rotor end 37 of which is toothed and forms the drive pinion for an intermediate drive wheel 17, which in turn is fixedly connected to the intermediate drive pinion 16.
  • Intermediate drive pinion 1 ' 6 and intermediate drive wheel 17 are mounted in maintenance-free sintered bushes.
  • electrical accessories such as drive capacitors 30, push-button switches 14 and a device socket, are fastened.
  • FIG. 12 shows a complete cutting mechanism chassis without a housing in a top view.
  • the basic structure consists of three uniform bearing plates 40, 41, 42, which at a distance from one another are congruent with the drive chassis, are also screwed tightly with four spacer bars 43 and the associated spacer tubes 44.
  • Cutting knife rollers 45 are stored in maintenance-free sintered bushes.
  • a scraper device 46 which is comb-shaped and prevents cut material from wrapping around the knife rollers.
  • a clutch gearwheel 39 which is rotatably supported by a pin stop by 180 °.
  • two counter-rotating gear wheels 38 which ensure that the knife rollers 45 run synchronously with one another.
  • pawls 22 are shown rotatably mounted on the cutting unit bearing plates 41, 42, which pawls are designed in mirror image to one another.
  • the pawls 22 snap into locking openings 25 with locking lugs 26 of the bearing plates 32 and 31 and are firmly clamped by means of a tensioning lever 23 like an eccentric.
  • the cover device is shown in cross section. It preferably consists of a lower cover plate 58 and an upper cover plate 59, which are connected to one another via a hinge 60.
  • a cover frame 61 is provided, which can be placed on the support frame 3.
  • the two cover plates 58 and 59 are preferably of the same size.
  • the upper cover plate 59 can be folded outwards, as shown in broken lines, so that both cover plates together provide a sufficient storage area.
  • the lower cover plate 58 is designed to be displaceable relative to the frame 61.
  • shoulder screws 62 are used, which are arranged in elongated holes or grooves 63 of the cover frame 61.
  • Fig. 15 shows partially cut the attachment of the chassis of the drive element 1 in its housing. Between the two lower spacer bars 34 of the chassis and the housing base there are rubber grommets 47 which, as for example the part enlargement in FIG. 15 clearly shows, prevent direct contact between the chassis and the housing when the two parts are screwed together. This minimizes any noise transmission.
  • the cutting mechanism 8, which is freely suspended on the drive chassis, can therefore also not transmit any noise directly to the housing of the drive unit 1.
  • FIG. 16 shows a further measure for noise absorption, wherein rubber sleeves 49 are provided between the drive element 1 with the cutting element 8 and the support frame 3 and engage in holes 50 in the support frame 3.
  • the cover or storage device 58 to 61 shown in the right part also has rubber grommets 49.
  • pins can be provided on the housing of the drive unit 1 and the cover frame 61, which protrude into the rubber grommets 49. This connection fixes the elements against each other and prevents direct contact and thus noise transmission to the support frame 3, so that the operating noise of the device is kept to a minimum.
  • the support frame 3 consists of two uniform tubular steel parts 52, which can be welded together in a U-shape, and of four identical plug-in elements 51. When combined, these elements result in an extremely stable support frame, which stands on the four rollers 5. The assembly of the individual parts can be done without difficulty.
  • the fully assembled support frame 3 is shown in Fig. 18.
  • FIG. 19 shows the waste container 6 in an exploded view.
  • Four wall plates 54 are inserted into a base part 57 and the edges are connected by means of corner strips 55.
  • An upper frame 56 serves to hold the wall panels 54 and the corner strips 55 together in a form-fitting manner.
  • the waste container 6 is firmly joined together.
  • the individual parts can be joined together in a simple manner.
  • the finished assembled waste container 6 is shown in FIG. 20 and in the installed state in FIG. 21 in the support frame 3 with the steel tube parts 52 and the plug elements 51.
  • the bottom 57 advantageously has circumferential wall recesses 57 'which cooperate in a form-fitting manner with the steel tube parts 52, since the wall recesses 57' which are laid deeper inwards via the storage surface result in a lateral limitation.
  • 23 to 26 is a partially sectioned and partially a side or front view of a wiper device 46.
  • the scraper device consists of four scraper elements 68 which, in the assembled state, enclose axially center-fitting pairs of cores 70 'or 70 "of the knife roller.
  • the scraper elements 68 are designed in such a way that in a single embodiment they are turned accordingly and turning, that is, by four times the total stripping device.
  • Fig. 24 shows in partial side section again how a knife roller 72 is enclosed over its entire length.
  • the ends of the stripper element 68 carry a shoulder 74, in the exemplary embodiment shown in the form of a transverse flat wedge-shaped shoulder, the shoulder being inserted into a punched-out portion of a bearing plate 73 during assembly.
  • This ensures that a constant distance between knife roller 72 and the stripper element is ensured, so that there is no unwanted friction.
  • the distance between the two knife rollers is selected such that a feed opening 18 still remains between the stripper elements 68 for introducing the material to be shredded.
  • the design of the stripper elements 68 is such that, as can be seen from FIGS. 23 and 25, segments 71 ', 71 "of the individual knives protrude freely on both sides.
  • the Wiper element 68 Due to the appropriate design of the Wiper element 68, it is possible to prevent rotation of bearing bushes 76, in which axes 78 of the measuring rollers are mounted. This takes place in that the bearing bush 76 has two parallel side surfaces which cooperate with correspondingly designed parts of the wiper ends 75.
  • 27 to 29 show a further embodiment of the device according to the invention for use in the processing of continuous paper 65.
  • 27 shows a side view of a folded-out storage surface 64 with a support 67 snapped into it.
  • a feed bracket 66 is attached to the device in such a way that it can be sunk or folded in when not in use.
  • the continuous paper 65 is pulled by the pulling of the knife rollers over the feed bracket 66, whereby it unfolds effortlessly.
  • the storage surface 64 can be folded into the support frame 3 when not in use, so that the outer contour of the device remains smooth.
  • 29 shows, analogously, a top view and shows how the storage surface 64 can be easily attached when the support frame 3 is assembled by means of pegs 79 on both sides, which protrude into holes in the steel tube parts 52.
  • the storage surface 64 and the feed bracket 66 are attached directly to the device and can be easily moved into the working position if required.

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

Claims (10)

1. Appareil pour le découpage ou le broyage de papier, carton, microfilms ou analogues avec un système de découpage et un mécanisme de entraînement pour ce système de découpage, caractérisé en ce que le mécanisme d'entraînement est constitué par un groupe autonome (1) qui es capable d'être relié à une ossature (3) munie d'un bac à déchets (6) et qui comporte un moteur (36), des éléments de circuit (14, 30) et un pignon de transmission (12) entraîné par le moteur (38), en ce qu'au moins un dispositif de découpage (8), ayant une largeur de coupe déterminée et constitué de cylindres à lames (45), d'une roue dentée de transmission (11, 39) et d'un dispositif de raclage (46), est agencé en groupe autonome échangeable et susceptible d'être relié à volonté au méchanisme d'entraînement (1) en étant suspendu librement et en ce qu'il est prévu des moyens de guidage (9, 15) et des moyens de blocage (13, 22) pour assurer avec précision une liaison entre le mécanisme d'entraînement (1) et le dispositif de découpage (8), le pignon de transmission (12) du mécanisme d'entraînement (1) venant en prise avec la roue dentée de transmission (11) du dispositif de découpage (8) lorsque ce dispositif de découpage est mis en place.
2. Appareil selon la revendication 1, caractérisé par des dispositifs de découpage (8) ayant des largeurs de coupe différentes et susceptibles d'être reliés chacun à volonté au groupe d'entraînement (1).
3. Appareil selon l'une des revendications 1 et 2, caractérisé en ce que le groupe d'entraînement (1) ou le dispositif de découpage (8) possède des tétons (9, 15) qui s'emboîtent dans des ouvertures de guidage et de centrage (9', 24) ménagées à cet effet dans l'autre de ces éléments.
4. Appareil selon la revendication 1 ou les suivantes, caractérisé en ce que les moyens de blocage sont constitués par des cliquets (13, 22) à engagement automatique et à dégagement manuel.
5. Appareil selon la revendication 1 ou les suivantes, caractérisé en ce que le mécanisme d'entraînement (1) est relié à l'ossature (3) par l'intermédiaire de blocs de caoutchouc (4) et est maintenu orienté en position convenable par des trous (50) ménagés dans l'ossature (3).
6. Appareil selon la revendication 1 ou les suivantes, caractérisé en ce que l'ossature (3) et le bac à déchets (6) indépendant sont formés chacun d'éléments (51 à '57) assemblables.
7. Appareil selon la revendication 6, caractérisé en ce que l'ossature (3) est constitué par un châssis en double U (51, 52) dont l'ouverture supérieure sert à recevoir le mécanisme d'entraînement (1) et un dispositif de découpage (8) et dans l'ouverture inférieure duquel le bac à déchets (6) peut être engagé par emboîtement (57').
8. Appareil selon la revendication 7, caractérisé en ce qu'une ouverture (7), qui subsiste dans l'ouverture supérieure du châssis de l'ossature (3) après mise en place du mécanisme d'entraînement (1) et adaptation d'un dispositif de découpage (8), est agencée pour être recou- verte d'une plaque (58, 59) déplaçable par coulissement et/ou rotation autour d'une charnière (60).
9. Appareil selon la revendication 1 ou les suivantes, caractérisé en ce qu'une tablette (64), rabattable et/ou abaissable contre la face arrière de l'ossature (3) et pouvant être soutenue par un étrier d'appui (67), est prévue pour recevoir du papier plié en accordéon (65) et en ce qu'un étrier de guidage (66) sert à l'amenée du papier (65) dans le dispositif de découpage (8).
10. Appareil selon la revendication 1 ou les suivantes, caractérisé en ce que le dispositif de raclage (4'6) du dispositif de découpage (8) est constitué de quatre éléments analogues (68) en forme de peignes dont deux entourent complètement chacun l'âme (70', 70") d'un cylindre à lames (72) de façon telle que des secteurs (71', 71") également grands des diverses lames (77) du cylindre à lames (72) émergent librement des deux côtés, en ce que les éléments (68) en forme de peignes s'emboîtent en bout, chacun par un appendice (74), dans une ouverture ménagée à cet effet dans une plaque (73) portant des paliers pour le cylindre à lames (72) et en ce que les extrémités (75) des éléments (68) en forme de peignes sont conformées de façon que les paliers (76) portés par la plaque (73) pour les cylindres à lames (72) soient maintenus chacun sans pouvoir tourner.
EP19790103990 1978-10-19 1979-10-16 Appareil pour le découpage ou le broyage de papier, carton, microfilms ou analogues Expired EP0010681B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT79103990T ATE846T1 (de) 1978-10-19 1979-10-16 Vorrichtung zum zerschneiden oder zerkleinern von papier, karton, mikrofilmen od. dgl.

Applications Claiming Priority (8)

Application Number Priority Date Filing Date Title
DE2845447 1978-10-19
DE19782845447 DE2845447A1 (de) 1978-10-19 1978-10-19 Universalvorrichtung zum zerschneiden oder zerkleinern von microfilmen, papier, karton u.ae. - mit austauschbaren schneidwerk-kassetten
DE2849095 1978-11-11
DE19782849095 DE2849095A1 (de) 1978-11-11 1978-11-11 Universalvorrichtung zum zerschneiden oder zerkleinern von microfilmen, papier, karton u.ae.- mit austauschbaren schneidwerk-kassetten
DE19792913417 DE2913417A1 (de) 1979-04-04 1979-04-04 Abstreiferelement
DE19792930655 DE2930655A1 (de) 1979-04-04 1979-04-04 Universalvorrichtung zum zerschneiden oder zerkleinern von microfilmen, papier, karton u.ae. - mit austauschbaren schneidwerk - kassetten
DE2913417 1979-04-04
DE2930655 1979-04-04

Publications (2)

Publication Number Publication Date
EP0010681A1 EP0010681A1 (fr) 1980-05-14
EP0010681B1 true EP0010681B1 (fr) 1982-04-14

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Application Number Title Priority Date Filing Date
EP19790103990 Expired EP0010681B1 (fr) 1978-10-19 1979-10-16 Appareil pour le découpage ou le broyage de papier, carton, microfilms ou analogues

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EP (1) EP0010681B1 (fr)

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FR3010331B1 (fr) * 2014-04-01 2016-07-29 Erai-K Dispositif de destruction de supports de stockage informatique
CN108405133A (zh) * 2018-06-04 2018-08-17 彭希南 一种便携式交直流两用电动碎纸机

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DE2645284A1 (de) * 1976-10-07 1978-04-13 Guenter Trautmann Elektrische papierzerreissmaschine mit zwei oder mehr integrierten messerwalzenpaaren verschiedener schnittbreiten

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