EP3831493B1 - Method of operating a paper shredder - Google Patents

Method of operating a paper shredder Download PDF

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Publication number
EP3831493B1
EP3831493B1 EP20210750.4A EP20210750A EP3831493B1 EP 3831493 B1 EP3831493 B1 EP 3831493B1 EP 20210750 A EP20210750 A EP 20210750A EP 3831493 B1 EP3831493 B1 EP 3831493B1
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EP
European Patent Office
Prior art keywords
sheet material
calculated
filling level
waste container
sheet
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EP20210750.4A
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German (de)
French (fr)
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EP3831493A1 (en
Inventor
Paul Aries
Chloe BURTON
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Acco UK Ltd
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Acco UK Ltd
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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
    • B02C18/0007—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
    • B02C18/22—Feed or discharge means
    • B02C18/2216—Discharge means

Definitions

  • the invention relates to a method for operating a document shredder.
  • a document shredder generally has a waste container into which the shredded sheet material that the cutting unit produces from the sheet material inserted into the insertion slot fall.
  • the cutter When the waste bin is full and cannot accommodate any more shredded leaves, the cutter must be stopped and the waste bin must be emptied manually. This is particularly annoying for a user when sheet material has just been introduced for shredding and the shredding process has to be stopped. It is possible to check the filling level of the waste container before starting the shredding process in order to determine whether the shreds of the sheet material intended for shredding still fit into it. However, this is imprecise and expensive.
  • the invention is based on the idea that the filling level of the waste container can be calculated at least approximately from the running time of the motor driving the cutting mechanism if it is known what amount of sheet material is shredded per unit of time. Since the amount of sheet material shredded per unit of time is mostly dependent on the way in which the document shredder is operated and therefore often cannot be known exactly, the exact value of the amount of sheet material shredded per unit of time is calculated according to the invention in a first approximation by a Empirical value replaced, which is stored as a setpoint in a memory of the measuring device.
  • the measuring device can have a timer or timer.
  • the display unit can be integrated into the document shredder or be part of another device. For example, the filling level can be transmitted to a user's mobile communication device using an app.
  • the document shredder can have a support surface for the sheet material, in which the insertion slot is arranged. At least two types of sheet material feed are then possible, namely an automatic feed of sheet material lying on the support surface and a feed of sheet material that has been manually inserted into the insertion slot. Both types of sheet material feeder cannot be used at the same time.
  • the type of sheet material feed is advantageously recognized by means of a control device, and the desired value associated with the type of sheet material feed is selected from the memory. This takes into account the fact that with automatic sheet material feed usually only one sheet is drawn in and shredded when folded, while with manual sheet material feed one sheet or several sheets can be fed into the insertion slot at the same time and the target value must then be an empirical value.
  • the control device can be integrated into the measuring device or be a separate device.
  • the waste container is expediently stored in or on the housing so that it can be removed.
  • the removal of the waste container can then advantageously be recognized by means of a control device and the duration of the removal can be measured, and it the duration of the withdrawal can be included in the calculation of the filling level.
  • the running time of the motor can be set to zero by the measuring device if the duration of the removal exceeds a first threshold value at which it can be assumed that the waste container has been removed for emptying.
  • the calculated fill level can be reduced by a predetermined value or factor if the duration of the removal falls below the first threshold value but exceeds a second, lower threshold value, so that it can be assumed that a user has used the waste container for the purpose of compressing the in removed shreds of sheet material from it.
  • the control device can be the same as that used to identify the type of sheet material feed, or a separate control device.
  • a filling level sensor can be provided, which measures the filling level of the waste container and transmits this to the control device.
  • This can be an optical sensor, in particular an infrared sensor. He can measure the fill level himself or only measure whether the fill level exceeds a predetermined value.
  • a signal is expediently sent out by means of a signal unit when the calculated fill level and/or the fill level measured by the fill level sensor exceeds a predetermined value.
  • This can be a value that requires immediate emptying, or a value that indicates a specific level such as "75% full”. It is also possible to successively indicate when several values have been reached using different signals.
  • the signal unit can be integrated into the display unit.
  • the value specified for the calculated filling level can deviate from the value specified for the measured filling level and in particular can be smaller than this. Different intermediate values can be specified for the two values, and when they are reached, different signals are emitted.
  • the motor can be stopped temporarily, initiated by the control device, when an intermediate value is reached, in order to allow the pile of shredded material in the waste container to tip over.
  • the control device activates a device which distributes and/or compacts the stack of material contained in the waste container evenly in the waste container.
  • the amount of sheet material on the support surface is determined by means of a sensor, this amount is compared with the calculated fill level, and it is calculated whether the shredded sheet material produced from the determined amount of sheet material still fits into the waste container.
  • This amount can be displayed to the user by means of the display unit, so that he can decide whether to start a crushing process or, better yet, empty the waste container beforehand.
  • the quantity of sheet material whose shredded sheet material still fits into the waste container is advantageously calculated on the basis of the calculated fill level, and this quantity of sheet material is displayed by means of the display unit.
  • the display unit can have display elements arranged directly in the area of the support surface, which display how much shredded sheet material still fits into the waste container. For example, by means of lights that are arranged at different distances above the support surface, it can be indicated how much sheet material lying on the support surface still fits into the waste container after shredding.
  • the engine temperature is calculated from the running time and possibly from previous idle times of the engine using empirical values stored in the memory of the measuring device.
  • the calculated engine temperature is advantageous based on empirical values stored in the memory of the measuring device, a running time of a cooling device is calculated, which is required to cool the engine to a predetermined target temperature.
  • the calculated engine temperature can also be displayed to the user by means of the display unit, as can the calculated running time of the cooling device, so that the user can estimate whether the engine is about to be switched off due to overheating or how long it will take for an engine that has been switched off due to overheating to start operating again can go.
  • a further advantageous development of the invention provides that from the measured running time of the motor and the setpoint characterizing the amount of sheet material shredded per unit of time, an operating state of the document shredder is determined and displayed by means of the display unit, which contains a recommendation for maintenance and/or repair and/or or contains oils. Furthermore, the amount of shredded sheet material can be determined using a counter and displayed using the display unit and/or stored in the memory. Finally, in the configuration of the document shredder with a support surface for the sheet material, it is possible for the amount of shredded sheet material to be calculated from the type of sheet material feed used and the work done by the motor.
  • the document shredder 10 shown in the drawing has a housing 12 which has a cover 14 articulated by means of hinges on its upper side. Below the cover 14 is a storage compartment 16 for sheet material, which is accessible when the cover is open, so that sheet material can be inserted.
  • the bottom of the receiving compartment 16 forms a housing wall 18, whose upper side serves as a support surface 20 for the sheet material.
  • a cutting mechanism (not shown in detail) arranged in the housing 12 under the housing wall 18, from which the shredded sheet material produced from the sheet material is fed into a Housing 12 removably arranged waste container 24 fall.
  • the document shredder 10 also has three pairs of feed rollers 26 , each of which has a first feed roller 28 and a second feed roller 30 . These are each rotatably mounted about an axis of rotation arranged above the cutter and below the housing wall 18, the first feed rollers 28 being rotatable about a common first axis of rotation and the second feed rollers 30 about a common second axis of rotation.
  • the axes of rotation each extend parallel to a longitudinal extent of the insertion slot 22 which runs between the two slot ends 32 which form the narrow sides of the insertion slot 22 .
  • the lateral surfaces of the draw-in rollers 28, 30 protrude a little beyond the support surface 20, so that the sheet material lies directly on them and can be gripped by friction.
  • a pressure piece 34 on the cover 14 pressing on the stack of sheets improves the frictional connection.
  • the first feed rollers 28 counter-rotate with the second feed rollers 30, and the feed rollers 28, 30 are driven by the same motor as the cutting tools.
  • the document shredder 10 has a measuring device which is arranged in the housing 12 and is not shown in detail in the drawing and which measures the running time of the motor when the document shredder 10 is in operation.
  • a setpoint value is stored in a memory of the measuring device, which as an empirical value characterizes the quantity of sheet material shredded per unit of time. From this setpoint and the measured running time of the motor, the amount of shredded sheet material and thus the filling level of the waste container 24 is calculated by a computing unit of the measuring device and displayed by means of a display unit 36 in order to enable the user to empty the waste container 24 in good time.
  • a also arranged in the housing 12 and not in the drawing The control device shown recognizes when the waste container 24 is removed from the housing 12 and measures the duration of the removal.
  • the control device can be part of the measuring device or a separate device.
  • the duration of the bleed is included in the calculation of the level such that the measured running time of the engine is set to zero, corresponding to an empty waste container 24, if the duration of the bleed exceeds a first threshold value, which is typically required for the waste container 24 to close to empty. If the waste container 24 is removed for a period that exceeds the first threshold value, then it can be assumed that the waste container 24 was removed by the user for emptying, so that the fill level is usually reset to zero.
  • the calculated filling level is reduced by a predetermined factor, which corresponds to the reduction in the filling level during a typical manual compaction of the shredded sheet material in the waste container 24 if the duration of the removal falls below the first threshold value but exceeds a second threshold value, so that typically from a short removal for the purpose of manual compaction is to be assumed.
  • the amount of sheet material on the support surface 20 is determined by means of a sensor, not shown in detail, this amount is compared by the measuring device with the calculated filling level, and it is calculated whether the shredded sheet material produced from the determined amount of sheet material still fits into the waste container 24 . On the basis of the calculated fill level, the measuring device calculates the quantity of sheet material whose shredded sheet material still fits into the waste container 24 , and this quantity is displayed by means of the display unit 36 .
  • the display unit 36 can have display elements arranged in the receiving compartment 16 at different heights above the support surface 20, such as lights, in particular LED lights, which can be up to a height light up above the support surface 20 up to which the receiving compartment 16 is filled with sheet material can be, so that the sheet material still fits into the waste container 24 after shredding.
  • display elements arranged in the receiving compartment 16 at different heights above the support surface 20, such as lights, in particular LED lights, which can be up to a height light up above the support surface 20 up to which the receiving compartment 16 is filled with sheet material can be, so that the sheet material still fits into the waste container 24 after shredding.
  • the measurement of the running time of the engine is also used to calculate the engine temperature, which is then displayed by the display unit 36, from it and possibly from previous idle times of the engine using empirical values stored in a memory of the measuring device.
  • a running time of a cooling device is calculated and displayed, which is required to cool the engine down to a specified target temperature.
  • an operating state of document shredder 10 is determined by the measuring device from the measured running time of the motor and the setpoint characterizing the amount of sheet material shredded per unit of time and displayed by means of display unit 36, which contains a recommendation for maintenance and/or repair and/or oiling.
  • the amount of shredded sheet material is determined using a counter and displayed using the display unit 36 and/or stored in the memory.

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

Description

Die Erfindung betrifft ein Verfahren zum Betreiben eines Aktenvernichters.The invention relates to a method for operating a document shredder.

Ein Aktenvernichter weist in der Regel einen Abfallbehälter auf, in den die Blattgutschnitzel fallen, die das Schneidwerk aus dem in den Einführschlitz eingeführten Blattgut erzeugt. Wenn der Abfallbehälter voll ist und keine weiteren Blattgutschnitzel mehr aufnehmen kann, muss das Schneidwerk angehalten werden und der Abfallbehälter muss von Hand entleert werden. Dies ist für einen Benutzer insbesondere dann ärgerlich, wenn gerade Blattgut zum Zerkleinern eingeführt wurde und der Zerkleinerungsvorgang abgebrochen werden muss. Es ist zwar möglich, vor dem Start des Zerkleinerungsvorgangs den Füllstand des Abfallbehälters zu prüfen, um zu ermitteln, ob die Schnitzel des zur Zerkleinerung vorgesehenen Blattguts noch in ihn passen. Dies ist jedoch ungenau und aufwendig.A document shredder generally has a waste container into which the shredded sheet material that the cutting unit produces from the sheet material inserted into the insertion slot fall. When the waste bin is full and cannot accommodate any more shredded leaves, the cutter must be stopped and the waste bin must be emptied manually. This is particularly annoying for a user when sheet material has just been introduced for shredding and the shredding process has to be stopped. It is possible to check the filling level of the waste container before starting the shredding process in order to determine whether the shreds of the sheet material intended for shredding still fit into it. However, this is imprecise and expensive.

Ein derartiger Stand der Technik ist beispielsweise in US 9 480 989 B1 offenbart.Such prior art is, for example, in U.S. 9,480,989 B1 disclosed.

Es ist daher die Aufgabe der Erfindung, ein Verfahren zum Betreiben eines Aktenvernichters zu entwickeln, das eine Abschätzung des Füllstands des Abfallbehälters ermöglicht.It is therefore the object of the invention to develop a method for operating a document shredder that enables the filling level of the waste container to be estimated.

Diese Aufgabe wird erfindungsgemäß durch ein Verfahren mit den Merkmalen des Anspruchs 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind Gegenstand der abhängigen Ansprüche.According to the invention, this object is achieved by a method having the features of claim 1 . Advantageous developments of the invention are the subject matter of the dependent claims.

Der Erfindung liegt der Gedanke zugrunde, dass der Füllstand des Abfallbehälters zumindest näherungsweise aus der Laufzeit des das Schneidwerk antreibenden Motors errechnet werden kann, wenn bekannt ist, welche Menge an Blattgut je Zeiteinheit zerkleinert wird. Da die je Zeiteinheit zerkleinerte Menge an Blattgut meist abhängig ist von der Art und Weise, in der der Aktenvernichter bedient wird und daher oft nicht exakt bekannt sein kann, wird erfindungsgemäß in einer ersten Näherung der genaue Wert der je Zeiteinheit zerkleinerten Menge an Blattgut durch einen Erfahrungswert ersetzt, der als Sollwert in einem Speicher der Messeinrichtung gespeichert ist. Die Messeinrichtung kann einen Timer oder Zeitgeber aufweisen. Die Anzeigeeinheit kann in den Aktenvernichter integriert sein oder Bestandteil eines anderen Geräts sein. Beispielsweise kann der Füllstand mittels einer App auf ein mobiles Kommunikationsgerät eines Benutzers übermittelt werden.The invention is based on the idea that the filling level of the waste container can be calculated at least approximately from the running time of the motor driving the cutting mechanism if it is known what amount of sheet material is shredded per unit of time. Since the amount of sheet material shredded per unit of time is mostly dependent on the way in which the document shredder is operated and therefore often cannot be known exactly, the exact value of the amount of sheet material shredded per unit of time is calculated according to the invention in a first approximation by a Empirical value replaced, which is stored as a setpoint in a memory of the measuring device. The measuring device can have a timer or timer. The display unit can be integrated into the document shredder or be part of another device. For example, the filling level can be transmitted to a user's mobile communication device using an app.

Der Aktenvernichter kann eine Auflagefläche für das Blattgut aufweisen, in der der Einführschlitz angeordnet ist. Es sind dann mindestens zwei Arten des Blattguteinzugs möglich, nämlich ein automatischer Einzug von auf der Auflagefläche liegendem Blattgut und ein Einzug von manuell in den Einführschlitz eingeführtem Blattgut. Beide Arten des Blattguteinzugs können nicht gleichzeitig verwendet werden. Dabei wird vorteilhaft mittels einer Steuereinrichtung die Art des Blattguteinzugs erkannt, und aus dem Speicher wird der zur Art des Blattguteinzugs gehörende Sollwert ausgewählt. Damit wird der Tatsache Rechnung getragen, dass bei automatischem Blattguteinzug meist nur ein Blatt eingezogen und in gefaltetem Zustand zerkleinert wird, während bei manuellem Blattguteinzug ein Blatt oder mehrere Blätter gleichzeitig in den Einführschlitz eingeführt werden können und der Sollwert dann ein Erfahrungswert sein muss. Die Steuereinrichtung kann in die Messeinrichtung integriert oder eine separate Einrichtung sein.The document shredder can have a support surface for the sheet material, in which the insertion slot is arranged. At least two types of sheet material feed are then possible, namely an automatic feed of sheet material lying on the support surface and a feed of sheet material that has been manually inserted into the insertion slot. Both types of sheet material feeder cannot be used at the same time. In this case, the type of sheet material feed is advantageously recognized by means of a control device, and the desired value associated with the type of sheet material feed is selected from the memory. This takes into account the fact that with automatic sheet material feed usually only one sheet is drawn in and shredded when folded, while with manual sheet material feed one sheet or several sheets can be fed into the insertion slot at the same time and the target value must then be an empirical value. The control device can be integrated into the measuring device or be a separate device.

Der Abfallbehälter ist zweckmäßig entnehmbar im oder am Gehäuse gelagert. Dann kann vorteilhaft mittels einer Steuereinrichtung die Entnahme des Abfallbehälters erkannt und die Dauer der Entnahme gemessen werden, und es kann die Dauer der Entnahme in die Berechnung des Füllstands einbezogen werden. Dabei kann die Laufzeit des Motors von der Messeinrichtung auf Null gesetzt werden, wenn die Dauer der Entnahme einen ersten Schwellwert überschreitet, bei dem anzunehmen ist, dass der Abfallbehälter zur Leerung entnommen wurde. Des weiteren kann der errechnete Füllstand um einen vorgegebenen Wert oder Faktor vermindert werden, wenn die Dauer der Entnahme den ersten Schwellwert unterschreitet, aber einen zweiten, niedrigeren Schwellwert überschreitet, so dass angenommen werden kann, dass ein Benutzer den Abfallbehälter zum Zwecke der Komprimierung der in ihm befindlichen Blattgutschnitzel entnommen hat. Die Steuereinrichtung kann dieselbe sein, die auch zur Erkennung der Art des Blattguteinzugs herangezogen wird, oder eine separate Steuereinrichtung. Zudem kann ein Füllstandssensor vorgesehen sein, der den Füllstand des Abfallbehälters misst und diesen an die Steuereinrichtung übermittelt. Dieser kann ein optischer Sensor, insbesondere ein Infrarot-Sensor, sein. Er kann den Füllstand selbst messen oder aber nur messen, ob der Füllstand einen vorbestimmten Wert überschreitet.The waste container is expediently stored in or on the housing so that it can be removed. The removal of the waste container can then advantageously be recognized by means of a control device and the duration of the removal can be measured, and it the duration of the withdrawal can be included in the calculation of the filling level. The running time of the motor can be set to zero by the measuring device if the duration of the removal exceeds a first threshold value at which it can be assumed that the waste container has been removed for emptying. Furthermore, the calculated fill level can be reduced by a predetermined value or factor if the duration of the removal falls below the first threshold value but exceeds a second, lower threshold value, so that it can be assumed that a user has used the waste container for the purpose of compressing the in removed shreds of sheet material from it. The control device can be the same as that used to identify the type of sheet material feed, or a separate control device. In addition, a filling level sensor can be provided, which measures the filling level of the waste container and transmits this to the control device. This can be an optical sensor, in particular an infrared sensor. He can measure the fill level himself or only measure whether the fill level exceeds a predetermined value.

Um dem Benutzer anzuzeigen, dass der Abfallbehälter geleert werden muss, wird zweckmäßig mittels einer Signaleinheit ein Signal ausgesendet, wenn der errechnete Füllstand und/oder der vom Füllstandssensor gemessene Füllstand einen vorgegebenen Wert überschreitet. Dies kann ein Wert sein, der eine sofortige Leerung erfordert, oder aber ein Wert, der einen bestimmten Füllstand anzeigt wie beispielsweise "75% gefüllt". Auch die sukzessive Anzeige des Erreichens mehrerer Werte durch unterschiedliche Signale ist möglich. Die Signaleinheit kann in die Anzeigeeinheit integriert sein. Der für den errechneten Füllstand vorgegebene Wert kann von dem für den gemessenen Füllstand vorgegebenen Wert abweichen und insbesondere kleiner sein als dieser. Für beide Werte können unterschiedliche Zwischenwerte vorgegeben sein, bei deren Erreichen unterschiedliche Signale ausgesendet werden. Auch ein durch die Steuereinrichtung initiiertes vorübergehendes Anhalten des Motors bei Erreichen eines Zwischenwerts ist möglich, um ein Umkippen des Stapels des im Abfallbehälter befindlichen zerkleinerten Materials zu ermöglichen. Zudem kann die Steuereinrichtung aufgrund der erhaltenen Signale eine Einrichtung ansteuern, die den Stapel des im Abfallbehälter enthaltenen Materials gleichmäßig im Abfallbehälter verteilt und/oder verdichtet.In order to indicate to the user that the waste container must be emptied, a signal is expediently sent out by means of a signal unit when the calculated fill level and/or the fill level measured by the fill level sensor exceeds a predetermined value. This can be a value that requires immediate emptying, or a value that indicates a specific level such as "75% full". It is also possible to successively indicate when several values have been reached using different signals. The signal unit can be integrated into the display unit. The value specified for the calculated filling level can deviate from the value specified for the measured filling level and in particular can be smaller than this. Different intermediate values can be specified for the two values, and when they are reached, different signals are emitted. It is also possible for the motor to be stopped temporarily, initiated by the control device, when an intermediate value is reached, in order to allow the pile of shredded material in the waste container to tip over. In addition, can on the basis of the signals received, the control device activates a device which distributes and/or compacts the stack of material contained in the waste container evenly in the waste container.

Es kann vorgesehen sein, dass der Motor unabhängig vom errechneten Füllstand abgeschaltet wird, wenn der vom Füllstandssensor gemessene Füllstand einen vorgegebenen Maximalwert überschreitet. Dieses Abschalten ist dann nicht durch einen Benutzer beeinflussbar und überstimmt beispielsweise einen durch lange dauerndes Entnehmen des Abfallbehälters ohne dessen Entleeren falsch angegebenen errechneten Füllstand.Provision can be made for the motor to be switched off independently of the calculated fill level if the fill level measured by the fill level sensor exceeds a predetermined maximum value. This switching off cannot then be influenced by a user and overrules, for example, an incorrectly calculated filling level given by prolonged removal of the waste container without emptying it.

Gemäß einer vorteilhaften Weiterbildung der Erfindung wird mittels eines Sensors die Menge an Blattgut auf der Auflagefläche ermittelt, diese Menge wird mit dem errechneten Füllstand verglichen, und es wird berechnet, ob die aus der ermittelten Menge an Blattgut erzeugten Blattgutschnitzel noch in den Abfallbehälter passen. Diese Menge kann mittels der Anzeigeeinheit dem Benutzer angezeigt werden, so dass er entscheiden kann, ob er einen Zerkleinerungsvorgang startet oder besser vorher den Abfallbehälter leert. Alternativ oder ergänzend hierzu wird vorteilhaft anhand des errechneten Füllstands die Menge an Blattgut errechnet, deren Blattgutschnitzel noch in den Abfallbehälter passen, und diese Menge an Blattgut wird mittels der Anzeigeeinheit angezeigt. Zudem kann die Anzeigeeinheit direkt im Bereich der Auflagefläche angeordnete Anzeigeelemente aufweisen, die anzeigen, wie viel Blattgut in zerkleinertem Zustand noch in den Abfallbehälter passt. Beispielsweise kann mittels Leuchten, die in unterschiedlichen Abständen über der Auflagefläche angeordnet sind, angezeigt werden, wie viel auf der Auflagefläche liegendes Blattgut nach dem Zerkleinern noch in den Abfallbehälter passt.According to an advantageous development of the invention, the amount of sheet material on the support surface is determined by means of a sensor, this amount is compared with the calculated fill level, and it is calculated whether the shredded sheet material produced from the determined amount of sheet material still fits into the waste container. This amount can be displayed to the user by means of the display unit, so that he can decide whether to start a crushing process or, better yet, empty the waste container beforehand. As an alternative or in addition to this, the quantity of sheet material whose shredded sheet material still fits into the waste container is advantageously calculated on the basis of the calculated fill level, and this quantity of sheet material is displayed by means of the display unit. In addition, the display unit can have display elements arranged directly in the area of the support surface, which display how much shredded sheet material still fits into the waste container. For example, by means of lights that are arranged at different distances above the support surface, it can be indicated how much sheet material lying on the support surface still fits into the waste container after shredding.

Gemäß einer Weiterbildung der Erfindung wird aus der Laufzeit und gegebenenfalls aus vorangegangenen Ruhezeiten des Motors anhand von im Speicher der Messeinrichtung gespeicherten Erfahrungswerten die Motortemperatur errechnet. Vorteilhaft wird aus der errechneten Motortemperatur anhand von im Speicher der Messeinrichtung gespeicherten Erfahrungswerten eine Laufzeit einer Kühleinrichtung errechnet, die benötigt wird, um den Motor auf eine vorgegebene Solltemperatur abzukühlen. Die errechnete Motortemperatur kann dem Benutzer ebenso mittels der Anzeigeeinheit angezeigt werden wie die errechnete Laufzeit der Kühleinrichtung, so dass der Benutzer abschätzen kann, ob ein Abschalten des Motors wegen Überhitzung bevorsteht bzw. wie lange es dauert, bis ein wegen Überhitzung abgeschalteter Motor wieder in Betrieb gehen kann.According to a further development of the invention, the engine temperature is calculated from the running time and possibly from previous idle times of the engine using empirical values stored in the memory of the measuring device. The calculated engine temperature is advantageous based on empirical values stored in the memory of the measuring device, a running time of a cooling device is calculated, which is required to cool the engine to a predetermined target temperature. The calculated engine temperature can also be displayed to the user by means of the display unit, as can the calculated running time of the cooling device, so that the user can estimate whether the engine is about to be switched off due to overheating or how long it will take for an engine that has been switched off due to overheating to start operating again can go.

Eine weitere vorteilhafte Weiterbildung der Erfindung sieht vor, dass aus der gemessenen Laufzeit des Motors und dem die Menge des je Zeiteinheit zerkleinerten Blattguts charakterisierenden Sollwert ein Betriebszustand des Aktenvernichters bestimmt und mittels der Anzeigeeinheit angezeigt wird, der eine Empfehlung für Wartung und/oder Reparatur und/oder Ölen enthält. Des weiteren kann die Menge des zerkleinerten Blattguts mittels eines Zählwerks ermittelt und mittels der Anzeigeeinheit angezeigt und/oder im Speicher gespeichert werden. Schließlich ist es bei der Ausgestaltung des Aktenvernichters mit einer Auflagefläche für das Blattgut möglich, dass aus der verwendeten Art des Blattguteinzugs und der vom Motor geleisteten Arbeit die Menge des zerkleinerten Blattguts errechnet wird.A further advantageous development of the invention provides that from the measured running time of the motor and the setpoint characterizing the amount of sheet material shredded per unit of time, an operating state of the document shredder is determined and displayed by means of the display unit, which contains a recommendation for maintenance and/or repair and/or or contains oils. Furthermore, the amount of shredded sheet material can be determined using a counter and displayed using the display unit and/or stored in the memory. Finally, in the configuration of the document shredder with a support surface for the sheet material, it is possible for the amount of shredded sheet material to be calculated from the type of sheet material feed used and the work done by the motor.

Im Folgenden wird die Erfindung anhand eines in der Zeichnung schematisch dargestellten Ausführungsbeispiels näher erläutert. Es zeigen

Figur 1a, 1b
einen Aktenvernichter in perspektivischer Ansicht mit geschlossenem Deckel und im Gehäuse befindlichem Abfallbehälter sowie mit geöffnetem Deckel und herausgezogenem Abfallbehälter.
The invention is explained in more detail below with reference to an exemplary embodiment shown schematically in the drawing. Show it
Figure 1a, 1b
a document shredder in a perspective view with the lid closed and the waste container located in the housing and with the lid open and the waste container pulled out.

Der in der Zeichnung dargestellte Aktenvernichter 10 weist ein Gehäuse 12 auf, das an seiner Oberseite einen mittels Scharnieren angelenkten Deckel 14 aufweist. Unterhalb des Deckels 14 befindet sich ein Aufnahmefach 16 für Blattgut, das bei geöffnetem Deckel zugänglich ist, so dass Blattgut eingelegt werden kann. Den Boden des Aufnahmefachs 16 bildet eine Gehäusewand 18, deren Oberseite als Auflagefläche 20 für das Blattgut dient. In der Gehäusewand 18 befindet sich ein Einführschlitz 22, durch den auf der Auflagefläche 20 aufliegendes Blattgut eingezogen und einem im Gehäuse 12 unter der Gehäusewand 18 angeordneten, nicht im Detail dargestellten Schneidwerk zugeführt werden kann, von dem die aus dem Blattgut erzeugten Blattgutschnitzel in einen im Gehäuse 12 entnehmbar angeordneten Abfallbehälter 24 fallen. Der Aktenvernichter 10 weist zudem drei Einzugsrollenpaare 26 auf, die jeweils eine erste Einzugsrolle 28 und eine zweite Einzugsrolle 30 aufweisen. Diese sind jeweils drehbar um eine oberhalb des Schneidwerks und unterhalb der Gehäusewand 18 angeordnete Drehachse gelagert, wobei die ersten Einzugsrollen 28 um eine gemeinsame erste Drehachse und die zweiten Einzugsrollen 30 um eine gemeinsame zweite Drehachse drehbar sind. Die Drehachsen erstrecken sich jeweils parallel zu einer Längserstreckung des Einführschlitzes 22, die zwischen den beiden Schlitzenden 32 verläuft, welche die Schmalseiten des Einführschlitzes 22 bilden. Die Mantelflächen der Einzugsrollen 28, 30 stehen ein Stück weit über die Auflagefläche 20 vor, so dass das Blattgut direkt auf ihnen aufliegt und durch Reibschluss ergriffen werden kann. Ein auf den Blattgutstapel drückendes Druckstück 34 am Deckel 14 verbessert den Reibschluss. Die ersten Einzugsrollen 28 rotieren gegenläufig zu den zweiten Einzugsrollen 30, und die Einzugsrollen 28, 30 werden mittels desselben Motors angetrieben wie die Schneidwerkzeuge.The document shredder 10 shown in the drawing has a housing 12 which has a cover 14 articulated by means of hinges on its upper side. Below the cover 14 is a storage compartment 16 for sheet material, which is accessible when the cover is open, so that sheet material can be inserted. The bottom of the receiving compartment 16 forms a housing wall 18, whose upper side serves as a support surface 20 for the sheet material. In the housing wall 18 there is an insertion slot 22, through which the sheet material lying on the support surface 20 can be drawn in and fed to a cutting mechanism (not shown in detail) arranged in the housing 12 under the housing wall 18, from which the shredded sheet material produced from the sheet material is fed into a Housing 12 removably arranged waste container 24 fall. The document shredder 10 also has three pairs of feed rollers 26 , each of which has a first feed roller 28 and a second feed roller 30 . These are each rotatably mounted about an axis of rotation arranged above the cutter and below the housing wall 18, the first feed rollers 28 being rotatable about a common first axis of rotation and the second feed rollers 30 about a common second axis of rotation. The axes of rotation each extend parallel to a longitudinal extent of the insertion slot 22 which runs between the two slot ends 32 which form the narrow sides of the insertion slot 22 . The lateral surfaces of the draw-in rollers 28, 30 protrude a little beyond the support surface 20, so that the sheet material lies directly on them and can be gripped by friction. A pressure piece 34 on the cover 14 pressing on the stack of sheets improves the frictional connection. The first feed rollers 28 counter-rotate with the second feed rollers 30, and the feed rollers 28, 30 are driven by the same motor as the cutting tools.

Der Aktenvernichter 10 weist eine im Gehäuse 12 angeordnete und in der Zeichnung nicht näher dargestellte Messeinrichtung auf, die beim Betrieb des Aktenvernichters 10 die Laufzeit des Motors misst. In einem Speicher der Messeinrichtung ist ein Sollwert gespeichert, der als Erfahrungswert die Menge des je Zeiteinheit zerkleinerten Blattguts charakterisiert. Aus diesem Sollwert und der gemessenen Laufzeit des Motors wird die Menge des zerkleinerten Blattguts und somit der Füllstand des Abfallbehälters 24 von einer Recheneinheit der Messeinrichtung errechnet und mittels einer Anzeigeeinheit 36 angezeigt, um dem Benutzer ein rechtzeitiges Leeren des Abfallbehälters 24 zu ermöglichen. Eine ebenfalls im Gehäuse 12 angeordnete und in der Zeichnung nicht dargestellte Steuereinrichtung erkennt, wenn der Abfallbehälter 24 aus dem Gehäuse 12 entnommen wird und misst die Dauer der Entnahme. Die Steuereinrichtung kann Teil der Messeinrichtung sein oder eine separate Einrichtung. Die Dauer der Entnahme wird dergestalt in die Berechnung des Füllstands einbezogen, dass die gemessene Laufzeit des Motors auf Null gesetzt wird, entsprechend einem leeren Abfallbehälter 24, wenn die Dauer der Entnahme einen ersten Schwellwert überschreitet, der typischerweise benötigt wird, um den Abfallbehälter 24 zu leeren. Wird der Abfallbehälter 24 für eine Dauer entnommen, die den ersten Schwellwert übersteigt, so ist anzunehmen, dass der Abfallbehälter 24 vom Benutzer zur Leerung entnommen wurde, so dass in der Regel der Füllstand auf Null zurückzusetzen ist. Des weiteren wird der errechnete Füllstand um einen vorgegeben Faktor verringert, der der Verringerung des Füllstands bei einer typischen manuellen Verdichtung des zerkleinerten Blattguts im Abfallbehälter 24 entspricht, wenn die Dauer der Entnahme den ersten Schwellwert unterschreitet, aber einen zweiten Schwellwert überschreitet, so dass typischerweise von einer kurzen Entnahme zum Zwecke der manuellen Verdichtung auszugehen ist.The document shredder 10 has a measuring device which is arranged in the housing 12 and is not shown in detail in the drawing and which measures the running time of the motor when the document shredder 10 is in operation. A setpoint value is stored in a memory of the measuring device, which as an empirical value characterizes the quantity of sheet material shredded per unit of time. From this setpoint and the measured running time of the motor, the amount of shredded sheet material and thus the filling level of the waste container 24 is calculated by a computing unit of the measuring device and displayed by means of a display unit 36 in order to enable the user to empty the waste container 24 in good time. A also arranged in the housing 12 and not in the drawing The control device shown recognizes when the waste container 24 is removed from the housing 12 and measures the duration of the removal. The control device can be part of the measuring device or a separate device. The duration of the bleed is included in the calculation of the level such that the measured running time of the engine is set to zero, corresponding to an empty waste container 24, if the duration of the bleed exceeds a first threshold value, which is typically required for the waste container 24 to close to empty. If the waste container 24 is removed for a period that exceeds the first threshold value, then it can be assumed that the waste container 24 was removed by the user for emptying, so that the fill level is usually reset to zero. Furthermore, the calculated filling level is reduced by a predetermined factor, which corresponds to the reduction in the filling level during a typical manual compaction of the shredded sheet material in the waste container 24 if the duration of the removal falls below the first threshold value but exceeds a second threshold value, so that typically from a short removal for the purpose of manual compaction is to be assumed.

Mittels eines nicht näher dargestellten Sensors wird die Menge an Blattgut auf der Auflagefläche 20 ermittelt, diese Menge wird von der Messeinrichtung mit dem errechneten Füllstand verglichen, und es wird berechnet, ob die aus der ermittelten Menge an Blattgut erzeugten Blattgutschnitzel noch in den Abfallbehälter 24 passen. Anhand des errechneten Füllstands errechnet die Messeinrichtung die Menge an Blattgut, deren Blattgutschnitzel noch in den Abfallbehälter 24 passen, und diese Menge wird mittels der Anzeigeeinheit 36 angezeigt. Ergänzend oder alternativ hierzu bzw. ergänzend oder alternativ zur in der Zeichnung dargestellten Ausbildung der Anzeigeeinheit 36 kann die Anzeigeeinheit 36 im Aufnahmefach 16 in unterschiedlichen Höhen über der Auflagefläche 20 angeordnete Anzeigeelemente wie beispielsweise Leuchten, insbesondere LED-Leuchten, aufweisen, die bis zu einer Höhe über der Auflagefläche 20 aufleuchten, bis zu der das Aufnahmefach 16 mit Blattgut gefüllt sein kann, so dass das Blattgut nach dem Zerkleinern noch in den Abfallbehälter 24 passt.The amount of sheet material on the support surface 20 is determined by means of a sensor, not shown in detail, this amount is compared by the measuring device with the calculated filling level, and it is calculated whether the shredded sheet material produced from the determined amount of sheet material still fits into the waste container 24 . On the basis of the calculated fill level, the measuring device calculates the quantity of sheet material whose shredded sheet material still fits into the waste container 24 , and this quantity is displayed by means of the display unit 36 . In addition or as an alternative to this or in addition or as an alternative to the design of the display unit 36 shown in the drawing, the display unit 36 can have display elements arranged in the receiving compartment 16 at different heights above the support surface 20, such as lights, in particular LED lights, which can be up to a height light up above the support surface 20 up to which the receiving compartment 16 is filled with sheet material can be, so that the sheet material still fits into the waste container 24 after shredding.

Die Messung der Laufzeit des Motors wird zusätzlich dazu herangezogen, um aus ihr sowie gegebenenfalls aus vorangegangenen Ruhezeiten des Motors anhand von in einem Speicher der Messeinrichtung gespeicherten Erfahrungswerten die Motortemperatur zu errechnen, welche dann von der Anzeigeeinheit 36 angezeigt wird. Zudem wird eine Laufzeit einer Kühleinrichtung errechnet und angezeigt, die benötigt wird, um den Motor auf eine vorgegebene Solltemperatur abzukühlen. Weiter wird von der Messeinrichtung aus der gemessenen Laufzeit des Motors und dem die Menge des je Zeiteinheit zerkleinerten Blattguts charakterisierenden Sollwert ein Betriebszustand des Aktenvernichters 10 bestimmt und mittels der Anzeigeeinheit 36 angezeigt, der eine Empfehlung für Wartung und/oder Reparatur und/oder Ölen enthält. Schließlich wird die Menge des zerkleinerten Blattguts mittels eines Zählwerks ermittelt und mittels der Anzeigeeinheit 36 angezeigt und/oder im Speicher gespeichert.The measurement of the running time of the engine is also used to calculate the engine temperature, which is then displayed by the display unit 36, from it and possibly from previous idle times of the engine using empirical values stored in a memory of the measuring device. In addition, a running time of a cooling device is calculated and displayed, which is required to cool the engine down to a specified target temperature. Furthermore, an operating state of document shredder 10 is determined by the measuring device from the measured running time of the motor and the setpoint characterizing the amount of sheet material shredded per unit of time and displayed by means of display unit 36, which contains a recommendation for maintenance and/or repair and/or oiling. Finally, the amount of shredded sheet material is determined using a counter and displayed using the display unit 36 and/or stored in the memory.

Claims (15)

  1. Method for operating a document shredder (10) which has a housing (12) with an insertion slot (22) for inserting sheet material, a cutting unit which is arranged in the housing (12), is driven by a motor and has cutting tools for shredding the sheet material, and a waste container (24) which is arranged under the cutting unit for receiving sheet-material scraps falling down from the cutting unit, characterized in that the running time of the motor during shredding of the sheet material is measured by means of a measuring device, and in that a filling level of the waste container (24) is calculated from the measured running time and from a desired value, which is stored in a memory of the measuring device and characterizes the quantity of sheet material shredded per unit of time, and is displayed by means of a display unit (36).
  2. Method according to Claim 1, wherein the document shredder has a supporting surface (20) for the sheet material, in which supporting surface the insertion slot (22) is arranged, and therefore at least two types of sheet-material draw-in are made possible, namely an automatic draw-in of sheet material lying on the supporting surface (20) and a draw-in of sheet material inserted manually into the insertion slot (22), characterized in that the type of sheet-material draw-in is identified by means of a control device and the desired value belonging to the type of sheet-material draw-in is selected from the memory.
  3. Method according to Claim 1 or 2, wherein the waste container (24) is mounted removably in or on the housing (12), characterized in that the removal of the waste container (24) is identified by means of a control device and the duration of the removal is measured, and in that the duration of the removal is incorporated into the calculation of the filling level.
  4. Method according to Claim 3, characterized in that the running time of the motor is set to zero by the measuring device if the duration of the removal exceeds a first threshold value.
  5. Method according to Claim 4, characterized in that the calculated filling level is reduced by a predetermined value or factor if the duration of the removal falls below the first threshold value but exceeds a second threshold value.
  6. Method according to one of Claims 3 to 5, characterized in that the filling level of the waste container (24) is measured by a filling level sensor and transmitted to the control device.
  7. Method according to one of the preceding claims, characterized in that a signal is emitted by means of a signal unit if the calculated filling level and/or the filling level measured by the filling level sensor exceeds a predetermined value.
  8. Method according to Claim 6 and Claim 7, characterized in that the motor is turned off independent of the calculated filling level if the filling level measured by the filling level sensor exceeds a predetermined maximum value.
  9. Method according to one of Claims 2 to 8, characterized in that the quantity of sheet material on the supporting surface (20) is determined by means of a sensor, in that said quantity is compared with the calculated filling level, and in that it is calculated whether the sheet material scraps produced from the determined quantity of sheet material will still fit in the waste container (24).
  10. Method according to one of the preceding claims, characterized in that the quantity of sheet material, the sheet-material scraps of which will still fit in the waste container (24), is calculated with reference to the calculated filling level, and in that said quantity of sheet material is displayed by means of the display unit.
  11. Method according to one of the preceding claims, characterized in that the motor temperature is calculated from the running time and optionally preceding rest times of the motor with reference to empirical values stored in the memory of the measuring device.
  12. Method according to Claim 11, characterized in that a running time of a cooling device which is required to cool the motor to a predetermined desired temperature is calculated from the calculated motor temperature with reference to empirical values stored in the memory of the measuring device.
  13. Method according to one of the preceding claims, characterized in that an operating state of the document shredder (10) containing a recommendation for maintenance and/or repair and/or oiling is determined from the measured running time of the motor and the desired value characterizing the quantity of sheet material shredded by a unit of time and is displayed by means of the display unit (36).
  14. Method according to one of the preceding claims, characterized in that the quantity of shredded sheet material is determined by means of a counter and is displayed by means of the display unit (36) and/or is stored in the memory.
  15. Method according to one of the preceding claims, wherein the document shredder has a supporting surface (20) for the sheet material, in which supporting surface the insertion slot (22) is arranged, and therefore at least two types of sheet-material draw-in are made possible, namely an automatic draw-in of sheet material lying on the supporting surface (20) and a draw-in of sheet material inserted manually into the insertion slot (22), characterized in that the quantity of shredded sheet material is calculated from the type of sheet draw-in used and from the work performed by the motor.
EP20210750.4A 2019-12-04 2020-11-30 Method of operating a paper shredder Active EP3831493B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019133065.3A DE102019133065A1 (en) 2019-12-04 2019-12-04 Procedure for operating a document shredder

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Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6978954B2 (en) * 2001-08-28 2005-12-27 Fellowes, Inc. Detector for a shredder
US7213777B2 (en) * 2005-02-16 2007-05-08 Jrp Enterprises, Llc Public access information destruction system performing pay-per-use shredding
US7823815B2 (en) * 2008-10-15 2010-11-02 Fellowes, Inc. Shredder with self adjusting sensor
US20130200186A1 (en) * 2012-02-03 2013-08-08 John F. O'Rourke Paper shredder with thermo-regulated motor
CN103567030A (en) * 2012-08-07 2014-02-12 致伸科技股份有限公司 Paper shredding device with permissible thickness warning function
US9480989B1 (en) * 2013-09-04 2016-11-01 Herman Chang Disposable waste container system for paper shredder
US10537896B2 (en) * 2016-07-05 2020-01-21 Aurora Office Equipment Co., Ltd. Shanghai Autofeed paper shredder with clip and staple removal

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