EP2759346B1 - Shredder - Google Patents

Shredder Download PDF

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Publication number
EP2759346B1
EP2759346B1 EP14152035.3A EP14152035A EP2759346B1 EP 2759346 B1 EP2759346 B1 EP 2759346B1 EP 14152035 A EP14152035 A EP 14152035A EP 2759346 B1 EP2759346 B1 EP 2759346B1
Authority
EP
European Patent Office
Prior art keywords
shredder
thickness sensor
characterised
receiving slot
active part
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.)
Active
Application number
EP14152035.3A
Other languages
German (de)
French (fr)
Other versions
EP2759346A1 (en
Inventor
Hermann Schwelling
Original Assignee
Hermann Schwelling
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 to DE102013001260 priority Critical
Application filed by Hermann Schwelling filed Critical Hermann Schwelling
Publication of EP2759346A1 publication Critical patent/EP2759346A1/en
Application granted granted Critical
Publication of EP2759346B1 publication Critical patent/EP2759346B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/0007Disintegrating by knives or other cutting or tearing members which chop material into fragments specially adapted for disintegrating documents
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16Details
    • B02C18/22Feed or discharge means
    • B02C18/2225Feed means
    • B02C18/2291Feed chute arrangements
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00Control arrangements specially adapted for crushing or disintegrating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C18/00Disintegrating by knives or other cutting or tearing members which chop material into fragments
    • B02C18/06Disintegrating by knives or other cutting or tearing members which chop material into fragments with rotating knives
    • B02C18/16Details
    • B02C2018/164Prevention of jamming and/or overload

Description

    I. Field of application
  • The invention relates to a shredder / shredder for sheet material, such as e.g. Paper and the like material or similar data carriers according to the preamble of claim 1.
  • II. Technical background
  • From the Scriptures DE 10 2007 020 222 A1 a shredder is known, which has a cylindrical roller which projects into the receiving slot for the material to be shredded. The roller is rotatably mounted on a pivotable fork and a spring acts on the fork, so that the roller occupies a defined position in the receiving slot. If too much material to be shredded is fed to the receiving slot, the roller and thus also the fork are forced away from the slot area. During this movement, a switch is actuated, which then stops the electric motor for the cutting unit. The cylindrical roller and the opposite side of the receiving slot act here as it were as a thickness sensor to To prevent overloading of the cutting unit and / or the electric motor.
  • In Scripture US 2006/0219827 A1 Thickness sensors are described, which are translational or rotationally movable and protrude into the receiving slot. Again, it is again so, as in the aforementioned prior art that the gap in the receiving slot depending on the amount of zershreddernden - eg paper - changes.
  • Also in Scripture US 2010/0320299 A1 acts a thickness sensor, which is cylindrical and protrudes with a part of its lateral surface in the receiving slot of a shredder. This cylinder is mounted eccentrically and is held by a tension spring in its rest position. If too much paper is introduced into the receiving slot there, friction between the paper and the cylinder occurs, causing it to pivot into the receiving slot (effectively forming a wedge), thereby blocking the paper feed.
  • The shredder according to the prior art has in common that the receiving slot in the region of the thickness sensor is variable in width. In one case, an additional pivoting mechanism is needed to guide a roller of the thickness sensor out of the receiving slot, while in the
    Another case, the slot is narrowed even further, if there is too much paper in the receiving slot. This results in large forces between the thickness sensor and the cutting unit, because the cutting unit still pulls on the paper because of its follow-up time, while it is already blocked at the thickness sensor.
  • III. Presentation of the invention Technical task
  • Based on the above, it is therefore an object of the invention to find a shredder / shredder with a switching unit or a switching unit for a shredder / shredder, which at least reduces the disadvantages of said prior art.
  • Solution of the task
  • The object is achieved by a shredder with the features of claim 1. The subordinate claims disclose preferred embodiments of the invention. The switching unit of the shredder according to the invention contains at least one - in the sense of testing - the thickness of the supplied stack of sheet material sensing sensor (thickness sensor) and means which operates when a set limit is exceeded, a breaker , which interrupts the circuit for driving the cutting unit of the shredder, or a switching signal sends a control unit of the shredder, whereupon the control unit communicates with the drive of the shredder.
  • The subject of the invention differs in particular from the prior art in that the thickness sensor, for example, when supplying too much paper, on the one hand does not pivot out of the receiving slot, but concentrically rotates only about its longitudinal axis by a small amount, whereby a switch is actuated, which in turn forwards the corresponding signal to a controller of the shredder or the breaker actuated or selbiger.
    Also, according to the invention, the thickness sensor by the frictional forces between the supplied sheet material - such as paper - and not further drawn into the receiving slot, which can not come to tensile stresses between the thickness sensor and the cutting unit, as in known Solutions, eg after the US 2006/0219827 A1 the case is.
  • Because the thickness sensor pivots according to the invention for generating a switching signal or switching movement only about its longitudinal axis, fewer components for the thickness sensor are needed and you can also build the whole structure more stable overall. Another advantage is simple components for the thickness sensor itself and for coupled with the thickness sensor electrical / electronic switching unit, compared to the solutions can be produced and assembled according to the prior art with less effort.
    In particular, the invention allows the use of simple switches in the electrical / electronic circuit and / or circuit of the shredder. This becomes possible because the maximum sheet count limit of the material being fed is defined by the distance between the active and passive parts of the thickness sensor, the so-called gap, more specifically the gap thickness. Although only simple switches are used without great demands on the switching accuracy, with the thickness sensor according to the invention, a high inspection accuracy can be achieved. In addition, the process reliability is improved because a flutter / swing of the already detected and pulled from the cutting material only very little or no effect on the sensor elements of the thickness sensor has.
  • Preferred embodiments of the invention are the objects having the features of at least one of the claims 2 to 13.
  • embodiments
  • The invention will be explained in more detail and in detail with reference to exemplary embodiments shown schematically in drawings, but not limiting the invention. Show it
  • Fig. 1
    a first embodiment of the shredder according to the invention;
    Fig. 2
    a second embodiment of the shredder according to the invention;
    Fig. 3
    a third embodiment of the shredder according to the invention.
  • It should be assumed in the following that terms such as "top", "bottom", "left" and "right" refer only to the respective representation in the figures and that the actual arrangements may deviate from these terms. Also, the dimensions of the real components may differ from the dimensions in the figures. Furthermore, it is emphasized that the same components in the various figures are always provided with the same reference numerals; they also each have the same meaning, even if they are not explicitly mentioned in the description of the embodiments for each figure.
  • In the FIG. 1 is of the invention
    Shredder / shredder shown only the assembly in which the subject of the invention is arranged, the cutting unit 1 together with housing as a section, with a view into the interior. The Cutter 1 comprises a cutting roller pair 6. An associated gear, an electric motor and a controller have been omitted in this illustration. However, these components are a shredder known per se from the prior art.
    From an upper side of the housing 2 of the cutting unit 1, the material to be comminuted - for example, several layers of sheet-shaped paper - fed via a receiving slot 4 the cutting roller pair 6. The receiving slot 4 extends from the top of the housing 2 substantially down to the draw-in area 19 of the cutting roller pair 6.
  • The cutting rollers 6 may be formed such that they are constructed of intermeshing cylinder sections and thereby produce paper strips, or they may also be additionally provided with a textured surface, so that they further shred the paper strips in their length.
    The comminuted material then leaves in the lower section 3 of the housing of the cutting unit 1, the cutting roller pair 6 and falls into the collecting container, also not shown.
  • So that a shredder can not be overloaded, he is equipped with a switching unit according to the invention, here with a thickness sensor 7, which is assigned primarily to the control of the shredder.
  • In the in FIG. 1 the first embodiment shown, the novel switching unit, the thickness sensor 7 consists of two parallel and spaced-apart cylinders, which are each rotatably mounted about a longitudinal axis 8 and protrude with a portion of its peripheral surface in the receiving slot 4.
    As a result, a gap 9 is formed between the two cylinders, which gap is substantially constant in its thickness independently of the rotational position of the cylinders. This gap 9 is also an equivalent for the designed performance of the shredder, ie for the maximum possible number of sheets, which may be supplied to the cutting roller pair 6.
  • The left cylinder of the thickness sensor 7 is the active part 10, because it acts by means of a cam or lever 12 in a rotary pivoting movement 13 on a switch 14. The switch 14 can be designed both as a make, but also as an opener of a circuit or an electrical / electronic control circuit.
    The part of the thickness sensor opposite the active part 10 of the thickness sensor 7 is the passive part 11. This name was chosen because the part 11 does not pass on any information to a control or an electric motor and only the further sliding of the material to be comminuted supported. In the thickness sensor 7 first type its passive part 11 is also arranged rotatably pivotable.
  • If, for example, too much paper, that is to say a larger number of sheets of paper than the maximum number of sheets specified in the operating instructions of the shredder, is passed over the receiving slot 4 on the thickness sensor 7, frictional forces occur between the paper and the active part 10, ie, a portion of its peripheral surface, or the passive part 11, that is, a portion of its peripheral surface, and the cylinders begin to rotate. The active part 10 of the thickness sensor 7 then actuates the switch 14. Has the switch 14- either directly or indirectly via a controller - the drive motor of the cutting 1 set out of operation, so can be shredded Good (for example, paper) from the Pick-up slot 4 are pulled out.
  • If the signal of the switch 14 is not routed via a controller, the motor could immediately start again in the case of an opposite pivoting movement 13 of the thickness sensor 7. For this reason, it is advantageous if the signal of the switch 14 runs via a controller and is restarted only after removal of the thick paper bundle and reducing the bundle of paper, the cutting process via a start command.
  • The preferred second embodiment according to FIG. 2 is essentially the subject of the FIG. 1 identical, but was used in the thickness sensor 71 used second Design / configuration on the right, rotating passive cylinder 11 omitted. Instead of this cylinder 11, the wall surface of the receiving slot 4 may be provided with a perpendicular to the image plane extending bead, for example, seen in cross-section a circular section 111. Instead of this bead 111 but also the flat surface of the receiving slot 4 may extend. Also, a widening wedge is conceivable. Decisive for the invention is merely that the gap 9 over the entire length of the receiving slot 4 - that is perpendicular to the image plane - is constant.
  • The preferred third embodiment of the invention according to FIG. 3 again shows a small difference to the object FIG. 2 on. The active part of the second type 101 of the thickness sensor 72 of the third type is no longer shown here as a complete cylinder, ie provided. Since the active part 101 exerts only a small pivoting movement 13, a complete circular cross section is not required. An angle 16 indicates that only a small peripheral region 16 of the second-type active part 101 is required to realize the full function of the third-type thickness sensor 72.
  • However, according to the invention, measures are also conceivable which increase the friction between the active part 10 or the active part of the second type 101 and the material to be shredded (for example paper). For example, the cylinder surface 15 may be roughened. In a further variant, the cylinder surface 15 may also be provided with a rubber-like layer, wherein this layer may consist of a shrunk-on tube, or else a glued-on strip. In a further embodiment of the cylinder surface 15, this may be provided with longitudinal grooves. It is also conceivable that the cylinder surface 15 is provided with spikes.
  • Thus, after deactivation of the shredder of the active part 10 and the active part of the second type 101 of the thickness sensor 7, 71 and 72 is again in the correct starting position, this can be brought according to the invention by a restoring force of the switch 14 in position.
  • In a further embodiment of the invention, the restoring force of the switch 14 and / or a restoring element acting on the active part 10 or 101 are designed to be adjustable. This restoring element, or the restoring moment resulting therefrom, can be arranged concentrically to the longitudinal axis 8 of the active part 10 or of the active part of the second type 101.
  • Furthermore, individual features or modes of operation described in conjunction with the figures can in themselves constitute an independent invention. The applicant therefore reserves the right to claim further features of significance essential to the invention which have hitherto been disclosed only in the description, in particular in conjunction with the figures. The claims filed with the application are thus merely formulation suggestions without prejudice to achieve further patent protection.
    A not shown, but within the scope of the claimed invention lying preferred embodiment may consist in that in the receiving slot 4 below the thickness sensor 7 and before the catchment area 19, a further sensor is arranged. This sensor is intended for switching on the cutting unit. In the presence of supplied material (paper) in this area, the sensor generates a switch-on signal for the cutting unit. If the material passes the sensor and there is no further material following, another signal is generated to shut down the cutting unit. This additional sensor is circuit-coupled with the thickness sensor in such a way that a signal from the thickness sensor, which corresponds to excessively fed paper, blocks the further sensor, so that switching on the cutting mechanism is not possible in such a circumstance.
  • A preferred further embodiment not shown, but within the scope of the claimed invention, may be that the passive element of the thickness sensor is eccentrically mounted, thus, the gap, i. its thickness, to the different limits for paper quantities / stack thicknesses of different security levels and cutting widths of Shredder / shredder can be set. This can also increase the degree of repetition in the shredder's production process and thus reduce the production costs.
  • An embodiment not shown of the invention is that the switching unit according to the invention is arranged in a receiving slot of a cutting mechanism of a shredder / Shredders, which is provided for the supply of data carriers in the form of DVDs, CD-ROMs, floppy disks or the like sheet-like data carriers.
  • References directory:
  • 1
    cutting
    2
    casing
    2a
    upper section (from position 2)
    3
    lower section (from position 2)
    4
    receiving slot
    5
    Outlet opening (to or from pos. 6)
    6
    Cutting roller pair
    7
    Thickness sensor (first type / design)
    71 Thickness sensor (second design / refinement)
    72 thickness sensor (third type / design)
    8th
    longitudinal axis
    9
    Gap (gap thickness)
    10
    active part of the thickness sensor
    (pivoting, rotatory)
    101
    active part of the second type of thickness sensor (pivoting, rotary)
    11
    passive part of the thickness sensor
    (pivoting, rotatory)
    111
    Passive part of the thickness sensor (bead; (circle section fixed, for pos. 71)
    12
    Cam or lever
    13
    Pivoting movement of the thickness sensor (from pos. 10)
    14
    counter
    15
    cylindrical surface
    16
    peripheral region
    17
    Direction of rotation when cutting
    18
    switch movement
    19
    Catchment area (entrance area from position 6)

Claims (12)

  1. Shredder having a cutting unit (1) mounted at the top and a collecting container disposed underneath, substantially comprising the following features:
    - the cutting unit (1) has a receiving slot (4) for the material to be shredded in the top section (2a) of the housing (2);
    - the cutting unit (1) has an outlet opening (5) for the shredded material on a bottom face of its bottom section (3) of its housing (2);
    - a cutting roller pair (6) driven by an electric motor is disposed between the receiving slot (4) and the outlet opening (5);
    - a thickness sensor (7) for the material to be shredded is disposed between the top face of the housing (2) of the cutting unit (1) and the intake region (19) of the cutting roller pair (6) ;
    - the thickness sensor (7) extends into the receiving slot (4) and
    - is mounted so as to be pivotable about a stationary longitudinal axis (8) - which extends parallel with the receiving slot (4);
    characterised in that
    a gap (9) - which is formed by an active part (10; 101) and a passive part (11; 111) of the thickness sensor (7; 71; 72) - remains substantially constant in the event of a possible pivoting movement (13) of the active part (10; 101) and/or the passive part (11).
  2. Shredder as claimed in claim 1,
    characterised in that
    at least the active part (10; 101) of the thickness sensor (7) is formed by a cylinder surface (15), at least in the circumferential section which extends into the receiving slot (4).
  3. Shredder as claimed in claim 1 or 2,
    characterised in that
    the passive part (111) of the thickness sensor (71; 72) is formed by a rigid, non-rotating face.
  4. Shredder as claimed in claim 1 or 2,
    characterised in that
    the passive part (11; 111) of the thickness sensor (7; 71) is formed by a cylinder surface (15), at least in the circumferential section which extends into the receiving slot (4).
  5. Shredder as claimed in at least one of claims 1 to 4, characterised in that
    the active part (10; 101) of the thickness sensor (7; 71; 72) has a cam or lever (12) which actuates a switch (14) during the pivoting movement (13) of the thickness sensor (7; 71; 72), as a result of which the cutting unit (1) is electrically deactivated - at least indirectly.
  6. Shredder as claimed in at least one of claims 1 to 5, characterised in that
    at least the cylinder surface (15) of the thickness sensor (7; 71; 72) facing the receiving slot (4) is provided with a surface which increases the coefficient of friction between material to be shredded and the active part (10; 101) of the thickness sensor (7; 71; 72).
  7. Shredder as claimed in claim 6,
    characterised in that
    the cylinder surface (15) is roughened.
  8. Shredder as claimed in claim 6,
    characterised in that
    the cylinder surface (15) is provided with a rubber-like layer.
  9. Shredder as claimed in claim 6,
    characterised in that
    the cylinder surface (15) is provided with longitudinal grooves.
  10. Shredder as claimed in claim 6,
    characterised in that
    the cylinder surface (15) is provided with spikes.
  11. Shredder as claimed in at least one of claims 5 to 10, characterised in that
    the restoring force of the switch (14) - after removing too thick material - also pivots the active part (10; 101) of the thickness sensor (7; 71; 72) back in rotation.
  12. Shredder as claimed in at least one of claims 5 to 10, characterised in that
    the restoring force of the switch (14) or a restoring moment in the active part (10; 101) of the thickness sensor (7; 71; 72) is of an adjustable configuration.
EP14152035.3A 2013-01-26 2014-01-21 Shredder Active EP2759346B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102013001260 2013-01-26

Publications (2)

Publication Number Publication Date
EP2759346A1 EP2759346A1 (en) 2014-07-30
EP2759346B1 true EP2759346B1 (en) 2019-03-13

Family

ID=50000799

Family Applications (1)

Application Number Title Priority Date Filing Date
EP14152035.3A Active EP2759346B1 (en) 2013-01-26 2014-01-21 Shredder

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Country Link
US (1) US9480988B2 (en)
EP (1) EP2759346B1 (en)
DE (1) DE102014100669A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106824432B (en) * 2016-12-21 2019-11-22 宁波江北思洞工业设计有限公司 A kind of shredder of antiwind hair
WO2019056712A1 (en) * 2017-09-21 2019-03-28 徐宁 Automatic paper feeding method for paper shredder, and paper shredder with improved automatic paper feeding device

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Also Published As

Publication number Publication date
DE102014100669A1 (en) 2014-07-31
US9480988B2 (en) 2016-11-01
EP2759346A1 (en) 2014-07-30
US20140231558A1 (en) 2014-08-21

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