EP2857102B1 - Procédé et dispositif de broyage de matériau en forme de feuille - Google Patents

Procédé et dispositif de broyage de matériau en forme de feuille Download PDF

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Publication number
EP2857102B1
EP2857102B1 EP14186245.8A EP14186245A EP2857102B1 EP 2857102 B1 EP2857102 B1 EP 2857102B1 EP 14186245 A EP14186245 A EP 14186245A EP 2857102 B1 EP2857102 B1 EP 2857102B1
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EP
European Patent Office
Prior art keywords
sheet
sheets
stack
conveying
cutting system
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EP14186245.8A
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German (de)
English (en)
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EP2857102A1 (fr
Inventor
Hermann Schwelling
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Individual
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Individual
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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
    • B02C18/22—Feed or discharge means
    • B02C18/2225—Feed means
    • B02C18/2283—Feed means using rollers
    • 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

Definitions

  • the invention relates to a method for comminuting sheet material, preferably for comminuting stacked paper sheets.
  • the invention further relates to an apparatus for practicing this method.
  • Paper sheets are cut into strips or, in the case of higher demands on the degree of destruction, into small and very small particles by means of a cutting mechanism.
  • the sheets are either taken individually from the top sheet starting from the stack and successively fed to the cutting unit, or, starting from the bottom sheet of the stack, through a feed opening in a stack support pulled through and inserted into the cutting unit.
  • the successive leaves may overlap partially.
  • the invention described below relates to such methods and apparatus in which comminution begins with the lowermost sheet of the stack.
  • the in DE 11 2010 005 685 T5 Document shredder described has two paper support parts of different lengths, between which a passage opening for the leaf stack in each case underlying sheet is formed. Due to the unequal length of support surfaces for the stack, the sheet is not detected centrally, but asymmetrically to its center region, folded V-shaped and folded with the area advanced in the cutting unit. The sheets are individually picked up and fed to the cutter, with mutual overlap provided in such a way that the comminution of one or more subsequent sheets already begins before the chopping of a leading sheet is completed.
  • the above-cited prior art methods and apparatus for shredding information carriers have the disadvantage that the sheets having a portion folded into a V-shape advance into the cutter, resulting in that Shredding the folded area Particles with an impermissibly large, usually double particle surface arise.
  • the specified size reduction or safety is not achieved.
  • the present invention seeks to provide a method which eliminates the disadvantages of the prior art and ensures comminution in the particle surface for each sheet, which corresponds to the predetermined size reduction stage.
  • Another object of the invention is to propose an apparatus for practicing this method.
  • the stack of sheets is placed on a, preferably aligned perpendicular to the direction of gravity, bearing surface of the support, and the detection of each lowermost sheet of the stack and its passage through the passage opening are made by means of counter-rotating conveyor rollers.
  • the force with which the stack of paper sheets rests on the conveyor rollers increases, for example by means of weights applied to the stack of sheets, in order to increase the static friction between the peripheral surfaces of the conveyor rollers and the respective sheet contacted by the conveyor rollers that the stiction at every stage the destruction of the stack is greater than the static friction between the sheets with each other.
  • the sheet loop is opened by terminating the contact of the sheet with one of the conveyor rollers and thereby releasing a sheet end, so that due to the thus possible relaxation of the sheet material, an extension of the liberated sheet end takes place.
  • the stretching of the sheet material is supported by the force of gravity, in particular in the case of a support surface aligned perpendicular to the direction of gravity.
  • the passage and the loop formation of the following sheet already begins when the preceding sheet with its free end reaches the cutting unit and is drawn into it.
  • the passage and the loop formation of the following sheet already begins when the preceding sheet with its free end reaches the cutting unit and is drawn into it.
  • the conveying speed of the conveyor rollers is smaller than the conveying speed of the cutting rollers of the cutting unit.
  • This bulging may be a wave-shaped deformation of each still before the cutting section located portion of a supplied paper sheet or even wrinkling. Wavy deformation or wrinkling on one or more sheets of paper would - relatively speaking - narrow the cross-section of the feeding area leading to the cutting unit. Such a restriction could cause a jam in the sheet feed and thus a disturbance in the workflow.
  • the term "elastic deformation” is assumed to apply to materials which, due to their properties, deform under a load, whereby material stresses arise, and after the end of the stress the material reforms again due to these stresses. That is, the elastic deformation exists only during the period in which a corresponding load acts on the material. If, on the other hand, the load and the resulting stresses in the material are so great that an irreversible change in shape occurs, the term "plastic deformation” applies.
  • connection partners applies in the context of the present invention as a force fit when acting on the surfaces contacting each other a normal force that prevents mutual displacement and thereby static friction exists. If one of the connection partners is moved, this contact causes a takeover of the other connection partner, as long as that through the Stiction caused counterforce is not exceeded.
  • the connection partners are toothed, that is, driving forces act not normal, but at an angle, for example at right angles, to the surfaces of the connection partners.
  • the device according to the invention is advantageous - but not limiting - designed so that the bearing surface is aligned for the sheet stack preferably perpendicular to the direction of gravity, so that the cancellation of the elastic deformation due to the relaxation of the sheet material by the force of gravity on the free end of the sheet is supported. This ensures with high certainty that the sheet end, after it is released by a first of the two conveyor rollers, while the sheet is conveyed by means of the second conveyor roller, enters the cutting unit, is gripped by the cutting unit and subsequently the entire sheet, after the other end of the sheet has been released by the second conveyor roller, pulled in by the cutting unit and cut into regular particles.
  • these guide elements are arranged and shaped in such a way that the cancellation of the elastic deformation of the said section of each blade, as it were, the swiveling of the blade end, can take place without hindrance or being assisted.
  • the device according to the invention is equipped with a third rotating conveyor roller which is in entrainment contact with the respective lowermost sheet of the stack by another opening present in the support opening, wherein the direction of rotation of the third conveyor roller of the rotation direction of the second Conveyor role corresponds, which is arranged between the first and third conveyor roller.
  • the distance between the axes of rotation of the first and the third conveyor roller measured parallel to the support surface is smaller than the length of the sheet.
  • the diameters of the three conveyor rollers are preferably the same size.
  • the device according to the invention is equipped with a device for increasing the force with which of the stack of sheets rests on the conveyor rollers, wherein mechanical forces or, more preferably, support weights are provided to increase the force.
  • the conveyor rollers are covered with a material which, in conjunction with the sheet material, gives the highest possible coefficient of friction, for example with a soft-elastic material.
  • the friction between the peripheral surfaces of the conveyor rollers and the leaves is then greater than the friction between the leaves, so that the separation of the leaves by detachment from the stack by means of the conveyor rollers is possible.
  • the peripheral surface of the conveyor rollers may be designed with a high degree of roughness, so that, as a result, the friction between the peripheral surfaces and the blades is greater than between the blades.
  • the device “V” is for crushing present in a stack 1 sheets 2.1, 2.2 ... 2.n, preferably paper sheets of size DIN A4, designed.
  • the device “V” comprises a support 3 for the stack 1, a cutting unit 4 with two counter-rotating cutting rollers 5.1 and 5.2 and a Blatter linears- and - discipline Road 6, for detecting the sheets 2.1, 2.2 .... n is formed individually from the stack 1 and to promote the isolated leaves to the cutting unit 4 out.
  • a collecting container 28 and a housing is arranged, in which the collecting container 28 can be put into the shredded material.
  • the support 3 and the Blatter writtens- and conveyor 6 are - in terms of design - according to a variant, each a technical assembly, which together form a functional unit of the device "V", namely the Autofeed unit 27th
  • the Blatter has two counter-rotating conveyor rollers 7.1 and 7.2, with their peripheral surfaces 8.1 and 8.2 by an existing in the bottom 3.1 of the support 3 through-opening. 9 reach through and thus with that of the leaves 2.1, 2.2 ... 2.n, which is closest, in contact. In the illustrated situation, this is the sheet 2.1.
  • the conveyor rollers 7.1 and 7.2 in Fig.1 are associated with arrows indicating their directions of rotation; the rotation.
  • the respective axis of the conveyor rollers 7.1 and 7.2 is denoted by A1 or A2, the axes of rotation.
  • the conveyor rollers 7.1 and 7.2 are coated with a material of low hardness, preferably rubber, for example, with a Shore value of equal to or less than 50A, so that between the peripheral surfaces 8.1 and 8.2 and contacted by the conveyor rollers 7.1 and 7.2 underside of Sheet 2.1 a friction-based compound with a higher coefficient of friction than between the leaves 2.1, 2.2 .. 2.n with each other.
  • a material of low hardness preferably rubber, for example, with a Shore value of equal to or less than 50A
  • the above-described arrangement is suitably designed so that due to the opposite rotation of the conveyor rollers 7.1 and 7.2 and the static friction, the sheet 2.1 detached from the stack 1 and pulled through the passage opening 9 to form a blade 4 extending toward the cutting unit.
  • the conveyor rollers 7.1 and 7.2 promote the detected area of the sheet 2.1 in opposite directions. As a result, that will Sheet material pushed together in this area, it deforms down and it forms the sheet loop 10, which is pushed in the sequence between the two conveyor rollers 7.1 and 7.2 down through.
  • the asymmetrical arrangement of the passage opening 9 is in Fig. 1 from the unequal lengths L1 and L2 measured to the respective ends of the leaves.
  • the opening of the sheet loop 10 achieved in this way and with this arrangement results in the release of the sheet end 11 and an extension of the sheet 2.1 in the region of the free sheet end 11 due to the relaxation of the sheet material.
  • the cutting unit 4 is positioned in relation to the conveying direction of the free end of the sheet 11 so that it passes between the counter-rotating cutting rollers 5.1 and 5.2, the sheet 2.1 at its free end of the sheet 11 of the cutting rollers 5.1 and 5.2 captured, fed into the cutting unit 4 and cut into particles over its entire length.
  • Fig. 1 shows four selected expiration phases P1, P2, P3 and P4 of the detection and passage of the sheet 2.1.
  • the sheet end 11 of the sheet 2.1 is released, it has already partially stretched as a result of the relaxation, while the promotion of the sheet is continued 2.1 alone with the conveyor roller 7.2.
  • Sequence phase P4 shows the now complete stretching of the sheet 2.1 in the region of its free end sheet 11. It is apparent here the positioning of the cutting mechanism 4 relative to the free end of the sheet 11, so that in the course of the promotion of the sheet 2.1 by means of the conveying roller 7.2, the sheet end 11 between the cutting rollers 5.1 and 5.2 passes.
  • the succeeding sheet 2.2 has reached the drain phase P1. If the sheet 2.1 reaches the drain phase P3, the following sheet 2.2 is also in the drain phase P2 and the following sheet 2.3 is in the drain phase P1. If the sheet 2.1 reaches the drain phase P4, the following sheet 2.2 is at the same time the drain phase P3 and the subsequent sheet 2.3 in the drain phase P2.
  • the leaves 2.1, 2.2... 2n pass through the drainage phases P1, P2, P3 and P4 in the illustrated, schematically shown, spatial and temporal distances and are cut into particles over their entire length in the cutting unit 4.
  • the inventive construction of the device "V” allows that the number / amount of simultaneously promoted to the cutting unit 4 towards leaves 2.1, 2.2 ... 2.n can be set variably. This can be done according to an embodiment by a corresponding adjustment of the conveying speed of the conveying roller 7.1 or the conveyor rollers 7.1 and 7.2.
  • Another embodiment for realizing this embodiment of the invention is that the length L1, see the FIGS. 1 to 1b , is variably adjustable.
  • the respective end wall 3.3 of the support 3 is advantageously arranged displaceable and lockable.
  • a combination of these two versions can be done.
  • support weights 12 are provided in a further embodiment of the invention. The support weights 12 are placed on the stack 1 in the area of the passage opening 9 or the first conveyor roller 7.1 and the second conveyor roller 7.2.
  • the device according to the invention differs from the prior art, in which, in comparable devices for increasing the force, it is not weights but mechanical compression springs that are used.
  • the use of springs has the disadvantage of the dependence of the force generated by the spring travel, whereby at lower stack height and the force and consequently the frictional engagement are smaller.
  • the support 3 is aligned with its provided at its bottom 3.1 supporting surface 3.2 for the leaves 2.1, 2.2 ... 2.n preferably perpendicular to the direction of gravity, so that the stretching of the sheet material after opening the blade loop 10 is supported by the force of gravity.
  • Fig. 1 a shows an embodiment variant of the device Fig. 1 equipped with a third rotating conveyor roller 7.3.
  • the conveyor roller 7.3 is by another in the bottom 3.1 of the support 3 existing opening 13 through positively or non-positively with the respective nearest sheet of the stack 1, shown here with the sheet 2.1, in driving contact, wherein the rotational direction of the conveying roller 7.3 of the rotational direction of Conveyor roller 7.2 corresponds.
  • a friction between each of the conveyor rollers 7.1, 7.2 and 7.3 provided.
  • the conveyor rollers are 7.1 , 7.2, 7.3 exemplified with rubber or rubber coated, which has a low degree of hardness. If the coefficient of static friction between the blades 2.1, 2.2...
  • a1 is the distance between the left end of the stack 1 and the axis of rotation A1 of the first conveyor roller 7.1; a12, the distance between the axes of rotation A1 and A2 of the first and the second conveyor roller 7.1 and 7.2; a13 denotes the distance between the axes of rotation A1 and A3 of the first conveyor roller 7.1 and the third conveyor roller 7.3 and a23 the distance between the axes of rotation A2 and A3 of the conveyor rollers 7.2 and 7.3, wherein the distances a1, a12, a13 and a23 respectively parallel to the support surface 3.2 at the bottom 3.1 of the support 3 are measured.
  • This profile is in the form of recesses 14, which have perpendicular to the direction of rotation aligned surface portions 15 whose height corresponds to the thickness of one of the leaves 2.1, 2.2 ... 2.n and which are distributed on the circumference so that with the rotation always one the surface portions 15 detects the respectively to be funded sheet 2.1, 2.2 ... or 2.n on its front side and thus forcibly contributes to the formation of the sheet loop 10.
  • the deployment length of the sheet end 11 is taken into account.
  • a safety distance is provided so that the blade end 11 is given sufficient space to move freely and unhindered into the cutting unit 4, which could otherwise result in a leaf jam.
  • the deployment length is dependent upon the amount of time the blade end 11 requires from detection with the conveyor roller 7.1 to full deployment, as shown by the expiration phase P4.
  • the conveyor rollers 7.1, 7.2 and 7.3 advantageously have the same diameter and the same peripheral speed. Otherwise, different diameters must be compensated for by different circumferential speeds or vice versa in order to compensate for undesired stresses in the sheet material or wrinkling of the sheet in the region between the conveyor rollers 7.2 and 7.3.
  • the drive of the conveyor rollers 7.1, 7.2 and 7.3 is done with conventional means.
  • the drive unit of the cutting unit 4 at least circuit technology, coupled or preferably takes place from the drive unit of the cutting unit.
  • a separate drive unit can also be used, which is preferably coupled to a control unit of the device "V".
  • FIG. 3 Another embodiment of the invention is in FIG. 3 shown.
  • This embodiment is based on the embodiment according to FIG. 1 , Here is the conveyor roller 7.1, at which during the formation of the temporary sheet loop 10, the respective blade end 11 is applied, a loop opener 22 assigned.
  • This loop opener 22 consists of a shaft 23 which is arranged at a distance and parallel to the axis A1 of the conveyor roller 7.1.
  • On the shaft 23 at least one, preferably at an axial distance from each other several star discs 24 are fixed.
  • the reference numeral 25 is in the FIG. 3 the circle of the radially protruding ends of the star discs 24 indicated, which results when the shaft 23 rotates.
  • FIG. 3 is also in the embodiments of the invention according to the FIGS. 1a and 2 usable.
  • FIG. 4 a further embodiment of the invention is shown.
  • a portion 31 of the upper portion of a housing 30 of the cutting unit 4 and a corresponding portion of the lower portion of a housing of Blatter initiateds- and - strict Republic 6 has a slot-shaped opening 29, which is guided to the front of the cutting unit arranged feed area 18 out.
  • said two sections may together form or contain the opening 29.
  • An embodiment of the invention is that on the support surface 3.2 of the support 3 of the Autofeed unit 27th Sideways walls are arranged upward 3.3, so that the support 3 is formed as a cassette, as in the FIGS. 1 to 4 is shown.
  • the support 3 is formed as a cassette, as in the FIGS. 1 to 4 is shown.
  • the cassette has no lid.
  • a cassette-shaped support 3 may also have a lid. If the device is provided for the shredding of confidential documents, the lid can also be designed lockable.
  • the closing can be done with a mechanically acting lock, or by an electro-mechanically operated lock.
  • a PIN code can be entered at the lock itself or at the switching and control device of the device "V", ie in the keypad, by means of which an authorization to open and close the lid Cassette can be assigned to specific persons.
  • the variant / variants of the input of the PIN code are in accordance with the further development of electro-mechanical Components and the control technology adapted to the current versions of the relevant components and control technology.
  • the input of the PIN code with the connection of a data carrier with the switching and control device of the device "V” done, for example, with or in conjunction with a USB stick or with a memory card or with an RFID system.
  • Autofeed unit 27 formed by the support 3 and the sheet detection and conveying device 6 is adaptable / can be placed on a series document shredder.
  • the drive for the autofeed unit 27 is integrated in the same, so that the autofeed unit 27 can operate autonomously.
  • a further embodiment is that in connection with the FIGS. 1 to 4 described embodiments of the invention are supplemented with a unit which is arranged below the cutting unit 4 and with which the shredded particles emitted by the cutting unit 4 fall into the arranged below the cutting unit 4 collecting container 28 that the formation of a bulk cone is avoided. This ensures that the volume of the collecting container 28 is better utilized. An otherwise usual during working intervention in the working process, such as a temporary removal of the collecting container for removing a formed bulk cone is avoided.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Delivering By Means Of Belts And Rollers (AREA)
  • Refuse Collection And Transfer (AREA)
  • Crushing And Pulverization Processes (AREA)

Claims (15)

  1. Procédé de déchiquetage ou de broyage de feuilles (2.1, 2.2, ...2.n), de préférence de feuilles de papier, présentes dans une pile (1), comprenant les étapes de procédé suivantes :
    - pose d'une pile (1) sur un support d'appui (3),
    - saisie des feuilles (2.1, 2.2,...2.n) individuellement à partir de la pile (1), à travers une ouverture d'extraction (9) dans le support d'appui (3) en formant à cette occasion une boucle de feuille (10),
    - transport des feuilles (2.1, 2.2,...2.n) ayant été séparées, de manière successive vers un groupe de découpage (4), et
    - découpage des feuilles (2.1, 2.2,...2.n) en particules au moyen du groupe de découpage,
    caractérisé en ce que
    - les feuilles (2.1, 2.2,...2.n), lors de la formation de boucle, ne sont déformées que de manière élastique et donc réversible,
    - chaque boucle de feuille (10) est ouverte en formant une extrémité libre de feuille (11) avant d'atteindre le groupe de découpage (4), et
    - tout en poursuivant le transport de feuille, les feuilles (2.1, 2.2,...2.n) sont introduites, avec les extrémités de feuille (11) en avant, dans le groupe de découpage (4),
    - les extrémités de feuille (11) étant saisies par le groupe de découpage (4) et tirées à l'intérieur du groupe de découpage (4), de sorte que chacune des feuilles (2.1, 2.2,...2.n) est découpée, en étant non pliée, le long de la totalité de sa longueur.
  2. Procédé selon la revendication 1, d'après lequel
    - la pile (1) est déposée sur une surface d'appui (3.2) du support d'appui (3), et
    - la saisie de celle inférieure des feuilles (2.1, 2.2,...2.n) de la pile (1) et son extraction à travers l'ouverture d'extraction (9) est effectuée au moyen de rouleaux de transport (7.1, 7.2) tournant l'un vers l'autre selon des sens opposés, dont les surfaces périphériques (8.1, 8.2) entrent en contact d'entraînement par complémentarité de formes et ou par adhérence avec celle inférieure des feuilles (2.1, 2.2,...2.n), et la force d'appui de la pile (1) sur les rouleaux de transport (7.1, 7.2) est avantageusement augmentée au moyen de poids d'appui (12).
  3. Procédé selon la revendication 1, d'après lequel il se produit une extension de l'extrémité de feuille (11) lors de l'ouverture de la boucle de feuille (10) en raison de la détente du matériau de feuille, et l'effet de la force de gravité sur l'extrémité libre de feuille (11) contribue de préférence à son extension.
  4. Procédé selon la revendication 1, d'après lequel il se produit une extension de l'extrémité de feuille (11) lors de l'ouverture de la boucle de feuille (10) en raison de la détente du matériau de feuille, et un ouvreur de boucle (22), qui agit sur l'extrémité libre de feuille (11) s'appuyant encore contre le rouleau de transport (7.1), contribue de préférence à son extension.
  5. Procédé selon la revendication 1, d'après lequel on débute déjà avec l'extraction et la formation de boucle de celle respectivement suivante des feuilles (2.1, 2.2,...2.n), avant que l'extrémité libre de feuille (11) de celle précédente des feuilles (2.1, 2.2,...2.n) ait atteint le groupe de découpage (4) et soit tirée à l'intérieur du groupe de découpage (4).
  6. Procédé selon la revendication 2, d'après lequel la pile (1) est posée sur une surface d'appui (3.2) du support d'appui (3) orientée selon un angle par rapport à la direction de la force de gravité.
  7. Procédé selon la revendication 2, d'après lequel la pile (1) est posée sur une surface d'appui (3.2) du support d'appui (3) orientée sensiblement de manière perpendiculaire à la direction de la force de gravité.
  8. Dispositif "V" de déchiquetage ou de broyage de feuilles (2.1, 2.2, ...2.n), de préférence de feuilles de papier, présentes dans une pile (1), par découpage, comprenant
    - un support d'appui (3) pour la pile (1),
    - un groupe de découpage (4) constitué de deux cylindres de coupe (50.1, 5.2) tournant l'un vers l'autre selon des sens opposés,
    - un dispositif de saisie et de transport de feuille (6) conçu pour saisir les feuilles (2.1, 2.2,...2.n) individuellement à partir de la pile (1) et pour transporter les feuilles séparées (2.1, 2.2,...2.n) vers le groupe de découpage (4),
    ensemble
    - dans lequel le dispositif de saisie et de transport de feuille (6) comprend deux rouleaux de transport (7.1, 7.2) tournant l'un vers l'autre selon des sens opposés, dont les surfaces périphériques (8.1, 8.2) sont en contact d'entraînement par complémentarité de formes et ou par adhérence avec la plus proche des feuilles (2.1, 2.2,...2.n) de la pile (1), à travers une ouverture d'extraction (9) existant dans le support d'appui (3), et
    - dans lequel le détachement de la plus proche des feuilles (2.1, 2.2,...2.n) de la pile (1) et son extraction à travers l'ouverture d'extraction (9) sont prévus de manière à produire la formation d'une boucle de feuille (10) s'étendant en direction du groupe de découpage (4),
    caractérisé en ce que
    - suite à une distance d'espacement prédéterminée des deux rouleaux de transport (7.1, 7.2), il est prévu que lors de la formation de boucle, il ne se produise qu'une déformation élastique, réversible, des feuilles (2.1, 2.2, ... 2.n), et
    - en raison d'une position asymétrique prédéterminée de l'ouverture d'extraction (9) par rapport aux extrémités des feuilles (2.1, 2.2,...2.n) dans la pile (1),
    - le contact d'entraînement d'un premier rouleau de transport (7.1) avec la feuille (2.1, 2.2,...2.n) est achevé alors que le deuxième rouleau de transport (7.2) est encore en contact d'entraînement avec la même feuille (2.1, 2.2, ... 2.n), de sorte qu'une extrémité de la feuille (2.1, 2.2,...2.n) est libre et que la déformation élastique s'annule avant que la boucle de feuille (10) atteigne le groupe de découpage (4), et
    - le groupe de découpage (4) est positionné par rapport à la direction de transport de l'extrémité libre de feuille (10) de manière telle que celle-ci parvienne entre les cylindres de coupe (5.1, 5.2), la feuille (2.1, 2.2,...2.n) étant saisie à son extrémité libre par le groupe de découpage (4), tirée au moyen des cylindres de coupe (5.1, 5.2) à l'intérieur du groupe de découpage (4), et découpée le long de la totalité de sa longueur.
  9. Dispositif selon la revendication 8, dans lequel l'annulation de la déformation élastique est prévue comme conséquence de la détente du matériau de feuille, l'effet de la force de gravité sur l'extrémité libre de feuille (10) contribuant de préférence à cette annulation.
  10. Dispositif selon la revendication 8, dans lequel dans la zone spatiale entre le dispositif de saisie et de transport de feuille (6) et le groupe de découpage (4), sont prévus des éléments de guidage (16, 17) pour l'extrémité de feuille (10).
  11. Dispositif selon l'une des revendications 8, équipé d'un troisième rouleau de transport (7.3) en rotation, qui est en contact d'entraînement par complémentarité de formées ou par adhérence avec la plus proche des feuilles (2.1, 2.2,...2.n) de la pile (1), à travers une autre ouverture (13) existant dans le support d'appui (3), le sens de rotation du troisième rouleau de transport (7.3) correspondant au sens de rotation du deuxième rouleau de transport (7.2), et le rouleau de transport (7.2) étant agencé entre les rouleaux de transport (7.1, 7.3).
  12. Dispositif selon la revendication 11, conçu pour la destruction de préférence de feuilles de papier de la taille normalisée A4, et réalisé selon les dimensions suivante :
    - diamètre d1 = 30 mm,
    - diamètre d2 = 30 mm,
    - diamètre d3 = 30 mm,
    - distance a1 = 40 mm,
    - distance a12 = 50 mm,
    - distance a13 = 214 mm,
    - distance a23 = 164 mm,
    avec
    d1, d2, d3, les diamètres des rouleaux de transport (7.1, 7.2, 7.3),
    a1, la distance entre une extrémité de la pile (1) et l'axe de rotation A1 du premier rouleau de transport (7.1),
    a12, la distance entre les axes de rotation A1 et A2 du premier et du deuxième rouleau de transport (7.1) et (7.2),
    a13, la distance entre les axes de rotation A1 et A3 du premier et du troisième rouleau de transport (7.1) et (7.3), et
    a23, la distance entre les axes de rotation A2 et A3 du deuxième et du troisième rouleau de transport (7.2) et (7.3).
  13. Dispositif selon l'une des revendications 8, équipé d'un système pour augmenter la force d'appui avec laquelle la pile (1) s'appuie sur les rouleaux de transport (7.1) et 7.2), des forces de ressort et/ou des poids d'appui (12) étant prévus pour l'augmentation de force.
  14. Dispositif selon l'une des revendications 8 ou 11, dans lequel les rouleaux de transport (7.1, 7.2, 7.3) sont enveloppés avec un matériau de faible dureté, de préférence avec un matériau élastique mou ou du caoutchouc, ou les surfaces périphériques des rouleaux de transport (7.1, 7.2, 7.3) sont réalisées de manière à présenter une rugosité telle, que la friction d'adhérence entre les rouleaux de transport (7.1, 7.2, 7.3) et la feuille (2.1, 2.2,...2.n) respectivement en contact avec eux, soit toujours plus élevée qu'entre les feuilles (2.1, 2.2,...2.n) entre-elles.
  15. Dispositif selon l'une des revendications 8, dans lequel au rouleau de transport (7.1) est associé un ouvreur de boucle (22), qui agit temporairement sur l'extrémité libre de feuille (11) de la feuille (2.1, 2.2,...2.n) respectivement transportée par le rouleau de transport (7.1).
EP14186245.8A 2013-09-25 2014-09-24 Procédé et dispositif de broyage de matériau en forme de feuille Active EP2857102B1 (fr)

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DE102014100716A1 (de) 2014-01-22 2015-07-23 Hermann Schwelling Einheit zum Zuführen von blattförmigem Material für einen Aktenvernichter
EP3093072B1 (fr) * 2015-04-30 2018-12-26 Hermann Schwelling Procede de securisation de documents deposes dans des cassettes de dechiqueteuses verrouillables contre l'acces non autorise et systeme d'execution du procede
US11052402B2 (en) * 2019-02-28 2021-07-06 Aurora Office Equipment Co., Ltd. Shanghai Automatic paper shredder with staple removing structure and staple removing method using same
DE102019126015A1 (de) 2019-09-26 2021-04-01 Acco Uk Ltd. Aktenvernichter
CN112169952A (zh) * 2020-10-20 2021-01-05 上海震旦办公设备有限公司 一种具有弯曲下纸结构的自动碎纸机

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EP0281136B1 (fr) * 1987-03-04 1991-07-17 Sharp Kabushiki Kaisha Appareil déchiqueteur
CN2080424U (zh) 1990-05-05 1991-07-10 北京市文教体育用品研究所 组合式刀具的文件粉碎机
JP2554220B2 (ja) 1991-11-29 1996-11-13 明電プラント株式会社 古紙の処理装置
DE10003218B4 (de) 2000-01-26 2005-02-17 Dahle Bürotechnik Gmbh Verfahren zum Vernichten von gestapelt vorliegendem Blattgut und Vorrichtung zur Verfahrensdurchführung
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JP5146699B2 (ja) 2010-06-03 2013-02-20 トヨタ自動車株式会社 繊維強化複合材製の部品の構造
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US20150083833A1 (en) 2015-03-26
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US9776191B2 (en) 2017-10-03
CN104607287A (zh) 2015-05-13

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