EP0818241B1 - Document shredder - Google Patents

Document shredder Download PDF

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Publication number
EP0818241B1
EP0818241B1 EP19970110711 EP97110711A EP0818241B1 EP 0818241 B1 EP0818241 B1 EP 0818241B1 EP 19970110711 EP19970110711 EP 19970110711 EP 97110711 A EP97110711 A EP 97110711A EP 0818241 B1 EP0818241 B1 EP 0818241B1
Authority
EP
European Patent Office
Prior art keywords
switching element
switch
document shredder
characterized
motor
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
EP19970110711
Other languages
German (de)
French (fr)
Other versions
EP0818241A1 (en
Inventor
Jens Erlecke
Jürgen Pechar
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Schleicher and Co International AG
Original Assignee
Schleicher and Co International AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to DE19627599 priority Critical
Priority to DE1996127599 priority patent/DE19627599A1/en
Application filed by Schleicher and Co International AG filed Critical Schleicher and Co International AG
Publication of EP0818241A1 publication Critical patent/EP0818241A1/en
Application granted granted Critical
Publication of EP0818241B1 publication Critical patent/EP0818241B1/en
Anticipated expiration legal-status Critical
Application status is Expired - Lifetime 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
    • B02C18/24Drives
    • 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
    • B02C2018/0023Switching devices

Description

The invention relates to a document shredder with a by an electric motor driven cutting unit and one if necessary, the switch for the electric motor operated by the material to be cut.

Such document shredders are e.g. from the document DE-A-3819285 known.

Such document shredders, including shredders for all kinds of flat material, waste or the like are understood either by mechanical switches or of light barriers, touch switches or the like set and switched off again. The especially with smaller ones Electric motors used in units are mostly single-phase AC motors or universal motors, i.e. Commutator motors. Their activation generates a current spike that affects the supply network and on the other hand also Caused radio interference. Certain such disorders will occur mostly accepted when they have a certain number in one do not exceed the specified time unit. If those "Click rate" but due to the high performance and the possibility successive numerous single sheets in one Entering document shredders that rise too high must be here be remedied.

Interference suppression devices that eliminate these interference or their Eliminating effects is very complex and often economical for small devices that are particularly high Cause crack rate, hardly portable.

TASK AND SOLUTION

The object of the invention is therefore a document shredder of the type mentioned at the beginning, in which the Problem of network interference and radio interference on possible simple or inexpensive way eliminated or at least is improved.

This object is achieved in that the Switch for the electric motor and a phase detector containing variable delay circuit activated, the an electronic switching element provided in the motor circuit for switching in the zero crossing of the mains voltage controls.

The switch that triggers the operation, i.e. either on mechanical, manually operated switch, one of the Micro-operated switch or an output switch a light barrier control does not switch the motor directly. Rather, the circuit is used to activate a Phase detector used, e.g. the next zero crossing the mains voltage and then switches on the motor. The motor voltage therefore runs together with the mains shaft high and causing radio interference or network interference No voltage peak. It will not, as with a normal interference suppression that eliminates the interference that arises, but it becomes the cause of a disturbance, namely the Voltage spike, avoided. Special suppressors can So if the engine does not malfunction even when running caused.

This type of malfunction avoidance is particularly important for document shredders advantageous because they are natural for you very strong surge operation must be designed and also operated like this. You need a high starting torque often have and will reach the limits of their performance Electric motors and beyond.

With many triggers, for example with light barrier control, it is advisable to provide a wake, thus the one provided for example at the document inlet Light barrier cuts the incoming sheet to the end, after the end has already passed the light barrier. In in this case the delay circuit would be of one corresponding follower of the light barrier control for a delayed switch-off can be activated.

It is useful to have one with the electronic switching element mechanical switch to combine so that the switching time is determined by the electronic switching element, e.g. through series connection. This avoids rare, but possible accidents, e.g. the case that a semiconductor of electronic switching element e.g. due to an overvoltage alloyed and is therefore no longer controllable. This mechanical switches would then, however, before or after the or switch-off take effect and thus switch off.

The electronic switching element can, for example, by a Bridge rectifier can be realized by one in the Bridge diagonal lying transistor is controlled. As Phase detector can be a comparator responsive to "zero volts" be used.

These and other features go beyond the claims also from the description and the drawings.

The division of the application into individual sections as well Inter-headings limit those made under them Statements are not generally applicable.

BRIEF DESCRIPTION OF THE DRAWING

An embodiment of the invention is shown in the drawing and is explained in more detail below. The only description figure shows:
a schematic diagram of the control of a shredder.

DESCRIPTION OF THE EMBODIMENT

A shredder 11 includes a cutter 12 Cutting rollers 13, whose toothed cutting disks 14 intermesh and thus a material to be cut 15 in strips or can cut particles 16. To turn on on the one hand a mechanical, manually operable pre and Reverse switch 17 provided and on the other hand a light barrier circuit, the sensors 18 on a feed chute 19 of the document shredder and a corresponding light barrier control 20 has. This gives an output signal that starts the motor 21 driving the cutting rollers and, possibly via a delay element after a lag phase of for example 2 seconds, switches off again after the end of the material to be cut 15 has passed the light sensor 18.

In the exemplary embodiment, the motor is a Single-phase AC motor (asynchronous motor) with one Capacitor enabling start-up 22. But it could also be a Universal motor, i.e. a collector series motor is provided his.

After the switch 17 is actuated and the direction of rotation via it the motor is determined, the activation of an electronic switching element 23 determines that in series with the motor branch of the mechanical switch 17 in the Power supply to the motor is. It is about a bridge rectifier 24 containing four diodes, in whose bridge diagonal a transistor 25 is arranged. He is driven by a phase detector 26, which is part of a variable delay circuit 27, which is controlled by the light barrier 20 is activated.

FUNCTION

The function is as follows:

With the switch 17, the machine is ready for operation switched. The switch 17 closes the circuit to the motor M. If a cutting material 15 is now fed to the machine, there are the light barrier control 20 ON signal to the variable Delay circuit 27. The phase detector 26 now determines the next zero crossing of the mains voltage and switches in the transistor 25 at this moment. The rectifier 24 is activated and the engine 21 starts to work. The voltage and current rise in the motor is corresponding the sinusoidal rise of the mains wave gently and generates no voltage peaks due to the in the motor and other parts of the device containing inductors or Capacities.

As soon as the material to be cut 15 has passed the light barrier, a follow-up time of for example started two seconds. If this is finished, so gives the light barrier control 20 of the variable delay circuit the OFF signal. The phase detector determines again the next zero crossing of the mains voltage and turns off transistor 25 at this time. The Rectifier 24 is deactivated and the document shredder is switched off. The one from the variable delay circuit The on and off delay caused is therefore from the time of the signal triggering the process (e.g. addressing the Light barrier) in relation to the mains frequency cycle and is usually between zero and one hundredth Second.

Other switching elements are also electronic switching elements such as thyristors, TRIAC, IGBT's etc. possible. It should be an electronic switching element that is at zero crossing is switchable or if it is a different structure Relay is acting, should the delay circuit Proper time of the relay are taken into account.

The invention therefore does not normally need to be minimized RC filters or LC filters used by interference and nevertheless avoids EMC interference.

Claims (5)

  1. Document shredder with a cutter (12) driven by an electric motor (21) and a switch (18, 20) for the electric motor (21) optionally operated by the material being cut (15), characterized in that the switch (18, 20) activates a variable delay circuit (27) containing a phase detector (26) and which controls an electronic switching element (23) provided in the motor circuit for switching in the zero passage of the mains voltage.
  2. Document shredder according to claim 1, characterized in that the variable delay circuit (27) is activated by a light barrier control (20), optionally with a lagging element for delayed disconnection.
  3. Document shredder according to claim 1 or 2, characterized in that a mechanical switch (17) is associated with the electronic switching element (23) in such a way that the switching time is determined by the switching element and is preferably connected in series.
  4. Document shredder according to one of the preceding claims, characterized in that the electronic switching element (23) contains a bridge-connected rectifier (24) with an electrical switch, e.g. a transistor (25) controllable by the variable delay circuit (27).
  5. Document shredder according to one of the preceding claims, characterized in that the electronic switching element (23) is provided in place of motor interference suppression elements.
EP19970110711 1996-07-09 1997-07-01 Document shredder Expired - Lifetime EP0818241B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19627599 1996-07-09
DE1996127599 DE19627599A1 (en) 1996-07-09 1996-07-09 Shredders

Publications (2)

Publication Number Publication Date
EP0818241A1 EP0818241A1 (en) 1998-01-14
EP0818241B1 true EP0818241B1 (en) 2001-10-17

Family

ID=7799319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19970110711 Expired - Lifetime EP0818241B1 (en) 1996-07-09 1997-07-01 Document shredder

Country Status (2)

Country Link
EP (1) EP0818241B1 (en)
DE (1) DE19627599A1 (en)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7946514B2 (en) 2004-09-10 2011-05-24 Fellowes, Inc. Shredder with thickness detector
US7954737B2 (en) 2007-10-04 2011-06-07 Fellowes, Inc. Shredder thickness with anti-jitter feature
US8091809B2 (en) 2009-03-24 2012-01-10 Fellowes, Inc. Shredder with jam proof system
US8201761B2 (en) 2009-01-05 2012-06-19 Fellowes, Inc. Thickness sensor based motor controller
US8205815B2 (en) 2009-05-15 2012-06-26 Fellowes, Inc. Paper alignment sensor arrangement
US8382019B2 (en) 2010-05-03 2013-02-26 Fellowes, Inc. In-rush current jam proof sensor control
USRE44161E1 (en) 2005-07-11 2013-04-23 Fellowes, Inc. Shredder with thickness detector
US8430347B2 (en) 2009-01-05 2013-04-30 Fellowes, Inc. Thickness adjusted motor controller
US8511593B2 (en) 2010-05-28 2013-08-20 Fellowes, Inc. Differential jam proof sensor for a shredder
US8550387B2 (en) 2009-06-18 2013-10-08 Tai Hoon K. Matlin Restrictive throat mechanism for paper shredders
US8672247B2 (en) 2005-07-11 2014-03-18 Fellowes, Inc. Shredder with thickness detector
US8678305B2 (en) 2009-06-18 2014-03-25 Fellowes, Inc. Restrictive throat mechanism for paper shredders
US8870106B2 (en) 2004-09-10 2014-10-28 Fellowes, Inc. Shredder with thickness detector
US10576476B2 (en) 2007-08-02 2020-03-03 ACCO Brands Corporation Shredding machine

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19902227A1 (en) * 1999-01-21 2000-07-27 Schleicher & Co Int Method and apparatus for operating an electric motor of a document shredder
EP1022123B1 (en) 1999-01-21 2005-05-04 SCHLEICHER & Co. INTERNATIONAL AKTIENGESELLSCHAFT Process and device for production of cushioning material and the cushioning material so produced
DE10047992A1 (en) * 2000-09-28 2002-04-11 Schleicher & Co Int Ag Data shredder with a cutting unit driven by an electric drive
GB2451513B (en) 2007-08-02 2012-04-18 Acco Uk Ltd A shredding machine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2045280C3 (en) * 1970-09-14 1980-09-25 Adolf 7460 Balingen Ehinger
US4157671A (en) * 1976-03-11 1979-06-12 Albert Goldhammer Drive for cutting rollers of paper shredding or cutting apparatus
US4192467A (en) * 1977-05-06 1980-03-11 Takefumi Hatanaka Document shredder
GB2096919B (en) * 1981-03-11 1984-12-05 Matsushita Electric Ind Co Ltd Shredder
US5041771A (en) * 1984-07-26 1991-08-20 Pt Components, Inc. Motor starting circuit
EP0200099B1 (en) * 1985-04-19 1991-09-11 Siemens Aktiengesellschaft Control circuit for an electromagnetic relay to interrupt an ac circuit under tension
DE3819285A1 (en) * 1988-06-07 1989-12-14 Ehinger Adolf Eba Maschf Electrical control device for paper shredders
US5164651A (en) * 1991-06-27 1992-11-17 Industrial Technology Research Institute Starting-current limiting device for single-phase induction motors used in household electrical equipment
DE4231242A1 (en) * 1992-09-18 1994-03-24 Buderus Heiztechnik Gmbh Reducing wear of electromechanical relay - using controlled switching in and switching out points for switching load related to voltage and current zero transitions
DE4237861A1 (en) * 1992-11-10 1994-05-11 Schleicher & Co Int Circuit for an electric motor, in particular for a drive motor of Materialzerkleinerungs- or pressing plants
DE4408470C2 (en) * 1993-03-22 1995-07-20 Hermann Schwelling Document shredder with schrankartigem base and top haubenartigem

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7946514B2 (en) 2004-09-10 2011-05-24 Fellowes, Inc. Shredder with thickness detector
US8870106B2 (en) 2004-09-10 2014-10-28 Fellowes, Inc. Shredder with thickness detector
US7963468B2 (en) 2004-09-10 2011-06-21 Fellowes, Inc. Shredder with thickness detector
US8783592B2 (en) 2004-09-10 2014-07-22 Fellowes, Inc. Shredder with thickness detector
US8757526B2 (en) 2005-07-11 2014-06-24 Fellowes, Inc. Shredder with thickness detector
US8672247B2 (en) 2005-07-11 2014-03-18 Fellowes, Inc. Shredder with thickness detector
USRE44161E1 (en) 2005-07-11 2013-04-23 Fellowes, Inc. Shredder with thickness detector
US10576476B2 (en) 2007-08-02 2020-03-03 ACCO Brands Corporation Shredding machine
US8020796B2 (en) 2007-10-04 2011-09-20 Fellowes, Inc. Shredder thickness with anti-jitter feature
US8424787B2 (en) 2007-10-04 2013-04-23 Fellowes, Inc. Shredder thickness with anti-jitter feature
US7954737B2 (en) 2007-10-04 2011-06-07 Fellowes, Inc. Shredder thickness with anti-jitter feature
US8464767B2 (en) 2007-10-04 2013-06-18 Fellowes, Inc. Shredder thickness with anti-jitter feature
US8500049B2 (en) 2007-10-04 2013-08-06 Fellowes, Inc. Shredder thickness with anti-jitter feature
US9044759B2 (en) 2007-10-04 2015-06-02 Fellowes, Inc. Shredder thickness with anti-jitter feature
US8113451B2 (en) 2007-10-04 2012-02-14 Fellowes, Inc. Shredder thickness with anti-jitter feature
US8430347B2 (en) 2009-01-05 2013-04-30 Fellowes, Inc. Thickness adjusted motor controller
US8201761B2 (en) 2009-01-05 2012-06-19 Fellowes, Inc. Thickness sensor based motor controller
US8091809B2 (en) 2009-03-24 2012-01-10 Fellowes, Inc. Shredder with jam proof system
US8205815B2 (en) 2009-05-15 2012-06-26 Fellowes, Inc. Paper alignment sensor arrangement
US8550387B2 (en) 2009-06-18 2013-10-08 Tai Hoon K. Matlin Restrictive throat mechanism for paper shredders
US8678305B2 (en) 2009-06-18 2014-03-25 Fellowes, Inc. Restrictive throat mechanism for paper shredders
US8382019B2 (en) 2010-05-03 2013-02-26 Fellowes, Inc. In-rush current jam proof sensor control
US8511593B2 (en) 2010-05-28 2013-08-20 Fellowes, Inc. Differential jam proof sensor for a shredder

Also Published As

Publication number Publication date
EP0818241A1 (en) 1998-01-14
DE19627599A1 (en) 1998-01-15

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