EP0818241B1 - Document shredder - Google Patents
Document shredder Download PDFInfo
- Publication number
- EP0818241B1 EP0818241B1 EP97110711A EP97110711A EP0818241B1 EP 0818241 B1 EP0818241 B1 EP 0818241B1 EP 97110711 A EP97110711 A EP 97110711A EP 97110711 A EP97110711 A EP 97110711A EP 0818241 B1 EP0818241 B1 EP 0818241B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- switching element
- document shredder
- motor
- electronic switching
- 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
Links
Images
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
- B02C18/0007—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
- 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
- B02C2018/0023—Switching devices
Definitions
- 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.
- 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.
- 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.
- the delay circuit would be of one corresponding follower of the light barrier control for a delayed switch-off can be activated.
- the electronic switching element can, for example, by a Bridge rectifier can be realized by one in the Bridge diagonal lying transistor is controlled.
- Phase detector can be a comparator responsive to "zero volts" be used.
- 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.
- 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.
- 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.
- 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.
- the machine 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.
- a follow-up time 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.
- 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.
Description
Die Erfindung betrifft einen Dokumentenvernichter mit einem von einem Elektromotor angetriebenen Schneidwerk und einem ggf. durch das Schneidgut betätigten Schalter für den Elektromotor.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.
Solche Dokumentenvernichter sind z.B. aus dem Dokument DE-A-3819285 bekannt.Such document shredders are e.g. from the document DE-A-3819285 known.
Derartige Dokumentenvernichter, worunter hier Vernichter für alle möglichen Arten von Flachmaterial, Abfällen o. dgl. zu verstehen sind, werden entweder von mechanischen Schaltern oder von Lichtschranken, Berührungsschaltern o. dgl. in Gang gesetzt und wieder abgeschaltet. Die insbesondere bei kleineren Einheiten verwendeten Elektromotoren sind meist Einphasen-Wechselstrommotoren oder Universalmotoren, d.h. Kommutatormotoren. Ihre Einschaltung erzeugt eine Stromspitze, die auf das Versorgungsnetz zurückwirkt und andererseits auch Funkstörungen verursacht. Gewisse derartige Störungen werden meist akzeptiert, wenn sie eine bestimmte Zahl in einer vorgegebenen Zeiteinheit nicht überschreiten. Wenn diese "Knackrate" aber aufgrund der hohen Leistung und der Möglichkeit, aufeinanderfolgende zahlreiche Einzelblätter in einen Dokumentenvernichter einzugeben, zu hoch steigt, muß hier abgeholfen werden.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.
Entstörmittel, die diese Störungen ausschalten oder ihre Wirkungen beseitigen, sind sehr aufwendig und häufig wirtschaftlich bei Kleingeräten, die insbesondere eine hohe Knackrate verursachen, kaum tragbar.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.
Aufgabe der Erfindung ist es daher, einen Dokumentenvernichter der eingangs erwähnten Art zu schaffen, bei dem das Problem der Netzrückwirkung und Funkstörung auf möglichst einfache und wenig aufwendige Art beseitigt oder zumindest verbessert ist.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.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß der Schalter für den Elektromotor eine einen Phasendetektor enthaltende variable Verzögerungsschaltung aktiviert, die ein im Motorstromkreis vorgesehenes elektronisches Schaltglied zur Schaltung im Null-Durchgang der Netzspannung ansteuert.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.
Der den Betrieb auslösende Schalter, also entweder ein mechanischer, von Hand betätigbarer Schalter, ein vom Schneidgut betätigter Mikroschalter oder ein Ausgangsschalter einer Lichtschrankensteuerung schaltet also den Motor nicht direkt. Die Schaltung wird vielmehr zur Aktivierung eines Phasendetektors verwendet, der z.B. den nächsten Null-Durchgang der Netzspannung ermittelt und dann den Motor einschaltet. Die Motorspannung läuft also zusammen mit der Netzwelle hoch und eine Funkstörung oder Netzrückwirkung auslösende Spannungsspitze unterbleibt. Es wird somit nicht, wie bei einer normalen Entstörung, die entstehende Störung beseitigt, sondern es wird die Ursache einer Störung, nämlich die Spannungsspitze, vermieden. Spezielle Entstörglieder können also entfallen, wenn der Motor nicht selbst beim Lauf Störungen verursacht.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.
Diese Art der Störungsvermeidung ist besonders bei Dokumentenvernichtern vorteilhaft, weil sie naturgemäß für einen sehr starken Stoßbetrieb ausgelegt sein müssen und auch derart betrieben werden. Sie müssen ein hohes Anlaufdrehmoment haben und werden oft bis an die Leistungsgrenze ihrer Elektromotoren und darüber hinaus belastet.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.
Bei vielen Auslösungen, beispielsweise bei der Lichtschrankensteuerung, ist es zweckmäßig, einen Nachlauf vorzusehen, damit die beispielsweise am Dokumenteneinlaß vorgesehene Lichtschranke das einlaufende Blatt noch zu Ende schneidet, nachdem das Ende die Lichtschranke schon passiert hat. In diesem Falle würde die Verzögerungsschaltung von einem entsprechenden Nachlaufglied der Lichtschrankensteuerung für ein verzögertes Ausschalten aktiviert werden.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.
Es ist zweckmäßig, mit dem elektronischen Schaltglied einen mechanischen Schalter so zu kombinieren, daß der Schaltzeitpunkt vom elektronischen Schaltglied bestimmt wird, z.B. durch Reihenschaltung. Dies vermeidet zwar seltene, aber mögliche Störfälle, z.B. den Fall, daß ein Halbleiter des elektronischen Schaltgliedes z.B. infolge einer Überspannung durchlegiert und somit nicht mehr ansteuerbar ist. Dieser mechanische Schalter würde dann jedoch vor bzw. nach der Ein- bzw. Ausschaltung wirksam werden und somit stromlos schalten.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.
Das elektronische Schaltglied kann beispielsweise durch einen Brückengleichrichter realisiert werden, der von einem in der Brückendiagonale liegenden Transistor gesteuert wird. Als Phasendetektor kann ein auf "Null Volt" ansprechender Vergleicher eingesetzt werden.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.
Diese und weitere Merkmale gehen außer aus den Ansprüchen auch aus der Beschreibung und den Zeichnungen hervor.These and other features go beyond the claims also from the description and the drawings.
Die Unterteilung der Anmeldung in einzelne Abschnitte sowie Zwischen-Überschriften beschränken die unter diesen gemachten Aussagen nicht in ihrer Allgemeingültigkeit.The division of the application into individual sections as well Inter-headings limit those made under them Statements are not generally applicable.
Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung
dargestellt und wird im Folgenden näher erläutert. Die
einzige Beschreibungsfigur zeigt:
ein schematisches Schaltbild der Steuerung eines Aktenvernichters.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.
Ein Aktenvernichter 11 enthält ein Schneidwerk 12 mit
Schneidwalzen 13, deren ggf. gezahnte Schneidscheiben 14
ineinander eingreifen und somit ein Schneidgut 15 in Streifen
oder Partikel 16 zerschneiden können. Zur Einschaltung ist
einerseits ein mechanischer, manuell betätigbarer Vor- und
Rückwärtsschalter 17 vorgesehen und andererseits eine Lichtschrankenschaltung,
die Sensoren 18 an einem Einfüllschacht
19 des Aktenvernichters und eine entsprechende Lichtschrankensteuerung
20 aufweist. Diese gibt ein Ausgangssignal, das
den die Schneidwalzen antreibenden Motor 21 in Gang setzt
und, ggf. über ein Verzögerungsglied nach einer Nachlaufphase
von beispielsweise 2 Sekunden, wieder ausschaltet, nachdem
das Ende des Schneidgutes 15 die Lichtfühler 18 passiert hat.A
Bei dem Motor handelt es sich im Ausführungsbeispiel um einen
Einphasen-Wechselstrommotor (Asynchronmotor) mit einem den
Anlauf ermöglichenden Kondensator 22. Es könnte aber auch ein
Universalmotor, d.h. ein Kollektor-Reihenschlußmotor vorgesehen
sein.In the exemplary embodiment, the motor is a
Single-phase AC motor (asynchronous motor) with one
Capacitor enabling start-
Nachdem der Schalter 17 betätigt ist und über ihn die Drehrichtung
des Motors bestimmt wird, wird die Einschaltung von
einem elektronischen Schaltglied 23 bestimmt, das in Reihe
mit dem Motor-Zweig des mechanischen Schalters 17 in der
Stromzuführung zum Motor liegt. Es handelt sich dabei um
einen vier Dioden enthaltenden Brückengleichrichter 24, in
dessen Brücken-Diagonale ein Transistor 25 angeordnet ist. Er
wird von einem Phasendetektor 26 angesteuert, der Teil einer
variablen Verzögerungsschaltung 27 ist, die von der Lichtschrankensteuerung
20 aktiviert wird.After the
Die Funktion ist wie folgt:The function is as follows:
Mit dem Schalter 17 wird die Maschine in Betriebsbereitschaft
geschaltet. Der Schalter 17 schließt den Stromkreis zum Motor
M. Wird nun der Maschine ein Schneidgut 15 zugeführt, so gibt
die Lichtschrankensteuerung 20 EIN-Signal an die variable
Verzögerungsschaltung 27. Der Phasendetektor 26 ermittelt nun
den nächsten Null-Durchgang der Netzspannung und schaltet in
diesem Moment den Transistor 25 ein. Der Gleichrichter 24
wird damit aktiviert und der Motor 21 beginnt zu arbeiten.
Der Spannungs- und Stromanstieg im Motor ist dabei entsprechend
dem sinusförmigen Anstieg der Netzwelle sanft und
erzeugt keine Spannungsspitzen aufgrund der im Motor und
anderen Vorrichtungsteilen enthaltenden Induktivitäten oder
Kapazitäten.With the
Sobald das Schneidgut 15 die Lichtschranke passiert hat, wird
von der Lichtschrankensteuerung 20 aus eine Nachlaufzeit von
beispielsweise zwei Sekunden gestartet. Ist diese beendet, so
gibt die Lichtschrankensteuerung 20 der variablen Verzögerungsschaltung
das AUS-Signal. Der Phasendetektor ermittelt
wiederum den nächsten Null-Durchgang der Netzspannung und
schaltet zu diesem Zeitpunkt den Transistor 25 aus. Der
Gleichrichter 24 ist deaktiviert und der Aktenvernichter ist
ausgeschaltet. Die von der variablen Verzögerungsschaltung
bewirkte Ein- und Ausschaltverzögerung ist also vom Zeitpunkt
des den Vorgang auslösenden Signals (z.B. Ansprechen der
Lichtschranke) in Relation zum Netzfrequenz-Takt abhängig und
liegt also normalerweise zwischen Null und einer hundertstel
Sekunde.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
Als elektronisches Schaltglied sind auch andere Schaltelemente wie Thyristoren, TRIAC, IGBT's etc. möglich. Es sollte ein elektronisches Schaltglied sein, das im Nulldurchgang schaltbar ist oder, wenn es sich um ein anders aufgebautes Relais handelt, müßte durch die Verzögerungsschaltung die Eigenzeit des Relais berücksichtigt werden.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.
Die Erfindung benötigt also keine normalerweise zur Minimierung von Störungen verwendete RC-Filter oder LC-Filter und vermeidet trotzdem EMV-Störungen.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)
- 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.
- 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.
- 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.
- 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).
- 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.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19627599 | 1996-07-09 | ||
| DE19627599A DE19627599A1 (en) | 1996-07-09 | 1996-07-09 | Document shredder |
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 |
|---|---|---|---|
| EP97110711A Expired - Lifetime EP0818241B1 (en) | 1996-07-09 | 1997-07-01 | Document shredder |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0818241B1 (en) |
| DE (2) | DE19627599A1 (en) |
Cited By (12)
| 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 |
| 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 |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| DE19902227A1 (en) * | 1999-01-21 | 2000-07-27 | Schleicher & Co Int | Method and device for operating an electric motor of a document shredder |
| 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)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2045280C3 (en) * | 1970-09-14 | 1980-09-25 | Adolf 7460 Balingen Ehinger | Device for destroying files |
| 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 |
| ATE67341T1 (en) * | 1985-04-19 | 1991-09-15 | Siemens Ag | CONTROL CIRCUIT FOR AN ELECTROMAGNETIC RELAY FOR SWITCHING AN AC LOAD CIRCUIT. |
| 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 material crushing or pressing systems |
| DE4408470C2 (en) * | 1993-03-22 | 1995-07-20 | Hermann Schwelling | Document shredder with cabinet-like base and hood-like attachment |
-
1996
- 1996-07-09 DE DE19627599A patent/DE19627599A1/en not_active Withdrawn
-
1997
- 1997-07-01 EP EP97110711A patent/EP0818241B1/en not_active Expired - Lifetime
- 1997-07-01 DE DE59704928T patent/DE59704928D1/en not_active Expired - Lifetime
Cited By (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US7946514B2 (en) | 2004-09-10 | 2011-05-24 | Fellowes, Inc. | Shredder with thickness detector |
| USRE44161E1 (en) | 2005-07-11 | 2013-04-23 | 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 |
| US8113451B2 (en) | 2007-10-04 | 2012-02-14 | Fellowes, Inc. | Shredder thickness with anti-jitter feature |
| US8424787B2 (en) | 2007-10-04 | 2013-04-23 | Fellowes, Inc. | Shredder thickness with anti-jitter feature |
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| US9044759B2 (en) | 2007-10-04 | 2015-06-02 | Fellowes, Inc. | Shredder thickness with anti-jitter feature |
| US7954737B2 (en) | 2007-10-04 | 2011-06-07 | Fellowes, Inc. | Shredder thickness with anti-jitter feature |
| US8020796B2 (en) | 2007-10-04 | 2011-09-20 | 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 |
| US8678305B2 (en) | 2009-06-18 | 2014-03-25 | Fellowes, Inc. | Restrictive throat mechanism for paper shredders |
| US8550387B2 (en) | 2009-06-18 | 2013-10-08 | Tai Hoon K. Matlin | 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 |
| DE59704928D1 (en) | 2001-11-22 |
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