JP2008207059A - Contact safety protective device for shredder and shredder equipped with it - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a contact safety protective device for a shredder. <P>SOLUTION: In the contact safety protective device for the shredder equipped with a function circuit part 31 for the control of a document shredding machine part 1 and a continuity touch panel 32, the function circuit part 31 includes a power supply unit 33, a motor drive circuit unit 2, a control circuit unit 3 and a contact detection circuit unit 4 and the control circuit unit 3 is connected not only to the document shredding machine part 1 through the motor drive circuit unit 2 but also to the continuity touch panel 32 through the contact detection circuit unit 4, and the power supply unit 33 is connected to the control circuit unit 3 and the motor drive circuit unit 2, The contact detection circuit unit 4 includes a bio-voltage control switch circuit 34 for detecting the bio-current of the human body and a contact switch circuit 35. The bio-voltage control switch circuit 34 is connected to the continuity touch panel 32 and the control switch circuit 3 is connected to the earth switch circuit 35 while the earth switch circuit 35 is connected to the control circuit unit 3. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to the field of office equipment, and in particular, to a safety control technique for a shredder in an office, and more particularly to a contact safety protection device for a shredder and a shredder having the same.

  Various office automation equipment is becoming increasingly popular in modern life, the most common of which is used for document shredding, and thus a paper-breaker that helps to protect trade security That is, a shredder. This shredder is widely used at home as well as at offices.

  By the way, a general shredder is placed in an auto-inductive state when the power is turned on or before the power is turned off. Therefore, when an object is inserted, the document insertion port automatically operates, Shredding will be done.

  For this reason, if a foreign object or a human body enters a conventional document shredding machine, the document shredding machine may be damaged, and as a result, a human body may be damaged.

  On the other hand, there has been proposed a shredder safety mechanism that automatically stops the rotational operation of the blade when the waste box is pulled out as a safety device (for example, Patent Document 1).

However, the safety mechanism described in the above-mentioned patent document 1 is intended to stop the rotational operation of the blade by shutting off the power source by the operation piece when taking out the waste box and to collect the waste safely, and to ensure the safety of the document input port. It is not intended.
JP, 9-70552, A The shredder provided with the human body contact detection function as shown in Drawing 1 is developed now as what advanced the safety mechanism of the above-mentioned patent documents 1 further. Each unit in this shredder works as follows.

  As shown in FIG. 1, (1) SW2 is a polarity changeover switch, and a power supply energization line and a ground line can be switched. (2) The resistors R12 and R13, capacitors C3 and C2, and diodes D11, D12, D13, D14, D15, and D6 constitute a relay power supply (24V) circuit. (3) The diodes D6 and D7 and the capacitor C1 are composed of a power supply circuit of the voltage detection chip U1, and the positive electrode of the power supply is an energization line for the power supply.

  (4) The relay switch RLY-1, the diode D2, the triode Q1, the resistors R5, R27, R6, and the optical coupler U5 constitute a device operation power supply circuit. (5) The diodes D1, D8, D21, the temperature control display light (orange), the triode Q4, the resistors R4, R14, R11 and the motor temperature control switch constitute a temperature control display circuit. (6) The fuse F1, the switch RLY1, the motor, the function switch, and the motor temperature control switch constitute a motor operation circuit, and the motor traveling direction corresponds to the function switch position. (7) The power supply, resistors R7, R1, R9, R2, R8, R10, diodes D20, D16, D4, D5, D9, D10, triodes Q2, Q3, and the fifth leg of the voltage detection chip U1 are LED light display circuits. It is composed. (8) The panel metal portion, resistors R20, R19, R21, R22, capacitor C8 and diodes D19, D18 constitute a contact detection circuit.

  Under the above configuration, when the function switch is in the non-closed position, the drum is disconnected from the shredder, the magnetic spring switch is turned off, and the first leg of the voltage detection chip U1 detects the magnetic spring switch off signal, The fifth leg of the voltage detection chip U1 becomes high level, and Q3 and Q2 are turned off.

  The power indicator light R7, the contact indicator light R8, D9 and the motor temperature control switch form a loop. The power indicator light and touch indicator light are switched on. At that time, the sixth leg of U1 becomes high at the same time, and if the base electrode is not a positive voltage, the triode does not operate, so the shredder does not operate. When the drum is integrated with the shredder (ie, the magnetic spring switch is closed), the fifth leg of U1 is low, Q3 and Q2 are on, the power indicator light is on, and the sixth leg of U1. Goes low, Q1 turns on and the relay closes.

  When the function switch is in the reverse travel position, the shredder travels in the reverse direction. When the function switch is in the document shredding position, the shredder shreds the document (document input signal is on), and the shredder enters a standby state (document input signal is off). When the shredder is in operation, when a hand, metal part or animal touches the metal part of the shredder top cover, the power supply forms a loop through the human body or metal through R21, R19, R20, and the eighth leg of U1 is It goes low and the fifth and sixth legs of U1 go high.

  (A) When the sixth leg of U1 is at a high level, Q1 is turned off, the power supply is switched off, and the motor is stopped. (B) When the fifth leg of U1 is at a high level, Q2 and Q3 are turned off, and the contact protection indicator light (orange) is turned on. (C) As soon as the hand, metal part or animal is removed from the metal part of the top cover of the device, the shredder immediately resumes normal operation.

  The shredder will not operate if the function switch is in the closed position.

  In this way, the conductive touch panel is installed at the document input port of the document shredding machine, the circuit is controlled by conducting from the human body to the AC (power source) to achieve the contact protection purpose, and the power source is two 2 Since it is supplied through a 2 MΩ resistor, the current flowing through the human body is reduced so as not to damage the human body.

  However, this safety technology also requires a sensing voltage detection IC unit to monitor the state of the conductive touch panel in real time, and further needs to improve the stability and sensitivity of the IC unit. There is room for improvement, such as the deterioration of the detection function when aging.

  The present invention eliminates the disadvantages of the prior art and can monitor the biocurrent flowing in the human body in real time, and the control is performed safely and with high sensitivity with a simple circuit configuration and highly reliable operation performance. It is an object to provide a contact safety protection device for a document shredding machine that is safe and has a wide range of use.

  In order to achieve the above object, a contact safety protection device for a document shredding machine according to the present invention has the following configuration.

  The shredder contact safety protection device is a shredder contact safety protection device comprising a functional circuit unit for operating and controlling the shredder document shredding machine and a conductive touch panel installed at the document input port of the shredder, The functional circuit unit includes a power supply unit, a motor drive circuit unit, a control circuit unit, and a contact detection circuit unit, and the control circuit unit is connected to the document shredding machine unit via the motor drive circuit unit. And connected to a conductive touch panel via a contact detection circuit unit, the power supply unit is connected to each of the control circuit unit and the motor drive circuit unit, and the contact detection circuit unit detects a biocurrent of a human body. A bio-voltage control switch circuit including a control switch circuit and a ground switch circuit. The input control terminal is connected to the conductive touch panel, the output terminal of the control switch circuit is connected to the input control terminal of the ground switch circuit, and the output terminal of the ground switch circuit is connected to the input control terminal of the control circuit unit. The main feature is that

  The bio-voltage control switch circuit by the shredder contact safety protection device can be a switch transistor circuit.

  The biovoltage control switch circuit according to the shredder contact safety protection device includes a first switch triode, a base electrode of the first switch triode is connected to the conductive touch panel via a first resistor, and the base electrode is a first switch triode. Grounded via a second resistor connected in parallel to one capacitor, the collector of the first switch triode is connected to the power supply, and its emitter is grounded via a third resistor connected in parallel to the second capacitor; Is connected to the input control terminal of the ground switch circuit.

  Further, the collector of the first switch triode by the shredder contact safety protection device is connected to the power source via the power display LED and the contact display LED connected in parallel.

  The ground switch circuit by the shredder contact safety protection device can be a switch transistor circuit.

  The ground switch circuit by the shredder contact safety protection device includes a second switch triode, the base electrode of the second switch triode is connected to the output terminal of the biovoltage control switch circuit, and the emitter of the second switch triode Is grounded, and its collector is connected to the input control terminal of the control circuit unit.

  The collector of the second switch triode by the shredder contact safety protection device is connected to the power supply through the fourth resistor, and the collector is connected to the input control terminal of the control circuit unit through the optical coupler.

  The control circuit unit by the shredder contact safety protection device is further connected to a document input detection circuit unit, which includes an LED and a light dependent diode, and the light emitting portion of the LED is light sensitive to the light dependent diode. Each part is placed on the opposite wall of the document input passage of the document shredding machine.

  The control circuit unit by the shredder contact safety protection device is further connected to the overload protection circuit unit.

  The control unit by the shredder contact safety protection device is further connected to the motor reverse running detection circuit unit.

  A power supply unit by a shredder contact safety protection device includes a power interface circuit, a safety switch, a fuse, a control switch, a control circuit power circuit, and a document shredding function switch, and the power interface circuit is a safety switch. The fuse, the control switch, and the document shredding function switch are connected to the motor drive circuit unit, and the fuse is connected to the control circuit unit via a control circuit power supply circuit.

  The control switch by the shredder contact safety protection device can be a relay switch.

    Further, the present invention further proposes the above-described shredder contact safety protection device, a document shredding machine part for shredding a document, and a document shredding material shredded by the document shredding machine part. A shredder including a storage box.

  In the contact safety protection device for a shredder according to the present invention, a bio-voltage control switch circuit and a ground switch circuit connected in series are provided, and an input control terminal of the bio-voltage control switch circuit is connected to a conductive touch panel placed at a document input port of the shredder. Since the output terminal of the control switch circuit is connected to the input control terminal of the ground switch circuit, and the output terminal of the ground switch circuit is connected to the input control terminal of the control circuit unit, the human body contacts the conductive touch panel. In this case, both the bio voltage control switch circuit and the ground switch circuit are turned on by the bio-current of the human body to stop the control circuit unit.

  Therefore, even if the power switch is turned on, the document shredding machine does not operate, it is possible to protect the human body from accidental failures and monitor in real time, and the entire control is simple circuit configuration and reliability It is performed safely and with high sensitivity due to its operational performance, functions easy to handle, and can be used in a wide range with safety.

  A shredder having a contact safety protection device for a shredder according to the present invention stops the operation when the human body touches a conductive touch panel placed at a document input port of the shredder, and thus provides a shredder with high safety of human body protection. can do.

  Embodiments as the best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

  A first embodiment of the shredder contact safety protection device according to the present invention will be described with reference to FIGS. 2, 3 and 5.

  FIG. 2 is a block diagram including a contact safety protection device for a shredder according to the present invention, FIG. 3 is a circuit principle diagram of a first embodiment of a contact safety protection device for a shredder according to the present invention, and FIG. It is a flowchart which shows control of the contact safety protection apparatus for shredders.

  As shown in FIG. 2, the shredder contact safety protection device includes a document shredding machine unit 1, a functional circuit unit 31 for operating and controlling the shredder document shredding machine unit 1 (indicated by a chain line in FIG. 2), It comprises a conductive touch panel 32 installed at the document insertion slot.

  The functional circuit unit 31 includes a power supply unit 33 (indicated by a broken line in FIG. 2), a motor drive circuit unit 2, a control circuit unit 3, and a contact detection circuit unit 4.

  The power unit 33 includes a power interface circuit 81, a safety switch 82, a fuse 83, a control switch 84, a control circuit power circuit 85, and a document shredding function switch 86.

  The control circuit unit 3 is connected to the document shredding machine unit 1 via the motor drive circuit unit 2, and the control circuit unit 3 is further connected to the conductive touch panel 32 via the contact detection circuit unit 4.

  The control switch 84 is a relay switch, and the safety switch 82 is a gate switch. The power interface circuit 81 is connected to the motor drive circuit unit 2 via a safety switch 82, a fuse 83, a control switch 84, and a document shredding function switch 86. The fuse 83 is connected to the control circuit unit 3 via a control circuit power supply circuit 85.

  Among these, the contact detection circuit unit 4 includes a bio-voltage control switch circuit 34 that detects a current flowing through the human body via the conduction touch panel 32 and a ground switch circuit 35. The input control terminal of the bio voltage control switch circuit 34 is connected to the conduction touch panel 32, the output terminal of the bio voltage control switch circuit 34 is connected to the input control terminal of the ground switch circuit 35, and the output terminal of the ground switch circuit 35 is the control circuit. It is connected to the input control terminal of the unit 3.

  Next, the principle of the first embodiment of the shredder contact safety protection device according to the present invention will be described with reference to the circuit diagram with reference to FIG.

  As shown in FIG. 3 (refer to FIG. 2 as appropriate), the bio-voltage control switch circuit 34 that detects the human body current via the conductive touch panel 32 is a switch transistor circuit, and includes a first switch triode Q4. The base electrode of the first switch triode Q4 is connected to the conductive touch panel 32 via the first resistor R5, and the base electrode is grounded via the second resistor R6 connected in parallel to the first capacitor C7. The collector of the odd Q4 is connected to the power supply VCC, its emitter is grounded via a third resistor R16 connected in parallel to the second capacitor C8, and the emitter is connected to the input control terminal of the ground switch circuit 35.

  2 and 3, the ground switch circuit 35 is a switch transistor circuit and includes a second switch triode Q2 as shown in FIG. 3, and the base electrode of the second switch triode is a bio voltage control switch. The output terminal of the circuit 34, that is, the emitter of the first switch triode Q4 is connected, the emitter of the second switch triode Q2 is grounded, its collector is connected to the power supply via the fourth resistor R7, and the collector is the light The control circuit unit 3 is connected to an input control terminal via a coupler U1.

  The control circuit unit 3 shown in FIG. 2 is further connected to a document insertion detection circuit unit 5. In FIG. 3, the document insertion detection circuit unit 5 includes an LED IT1 and a light dependent diode IR1, and the light emission portion of the LED IT1 is Corresponding to the light sensitive parts of the light dependent diode IR1, each is placed on the opposite wall of the paper input path of the shredder.

  The control circuit unit 3 by the shredder contact safety protection device is further connected to an overload protection circuit unit 6 and a motor reverse running detection circuit unit 7.

  One end of the motor drive circuit unit 2 is electrically connected to the control circuit unit 3, and the other end is electrically connected to the document shredding machine 1 to drive the document shredding machine. . One end of the reverse running detection circuit unit 7 is electrically connected to the control circuit unit 3 and the other end is electrically connected to the document shredding machine unit 1 to detect a reverse running signal. A traveling signal is transmitted to the control circuit unit 3 so that the control circuit unit 3 controls the reverse traveling of the document shredding machine unit 1.

  One end of the document insertion detection circuit unit 5 is electrically connected to the control circuit unit 3, and the other end is electrically connected to the control circuit power source to monitor the document insertion signal. When a document enters the entrance of the document shredding machine unit 1, the document insertion detection circuit unit 5 transmits a document insertion signal to the control circuit unit 3, and when the processing of the control circuit unit 3 is completed, the motor drive circuit unit 2 is turned on. Then, the document shredding machine unit 1 is driven to operate.

  The operation of the shredder contact safety protection device according to the present invention will be described with reference to FIG. 5. When a human body accidentally touches the touch panel at the document input port in the document shredding operation (S11), the contact detection circuit unit 4 is operated. The signal is detected and processed (S12). Then, the human body signal is transmitted to the control circuit unit 3, and the control circuit unit 3 switches off the motor drive signal (S13). Thereafter, the document shredding machine unit 1 is stopped through the motor drive circuit unit 2 so as to execute the human body contact automatic stop function (S14).

  If the human body is not in contact with the touch panel of the document input port, the control circuit unit 3 controls the motor drive circuit unit 2 to perform the normal operation of the document shredding machine unit 1 (S15). A normal operation is performed (S16).

  As shown in FIG. 3, according to the first embodiment of the present invention, the shredder contact safety protection device and the shredder equipped with the shredder include (1) overload detection, (2) photo-operation document shredding, (3 ) Document shredding, closing and reverse running functions, and (4) human body contact automatic stop function.

  That is, the power supply circuit for the control circuit cuts down the voltage using a resistor-capacitor, and the 24V low voltage control circuit power supply is connected to the power supply through the resistors R1, R2, capacitors C1, C2, diodes D5, D6 and the constant voltage diode ZD1. Supplied from the power line. At this time, the potential difference between the positive electrode of the power supply and the zero line of the control circuit is 24 V, which is much lower than the safety voltage of the human body, so there is no danger to humans and animals. The power supply circuit processed by the human body touch panel is a bridge rectifier circuit, and a 12VDC power supply is obtained from the constant & filter circuit. This circuit is composed of diodes D1-D4, a constant diode ZD2, a resistor R12, and a capacitor C3.

  The metal part in contact with the human body is connected to the base electrode of the triode Q4 through a resistor (1 MΩ), and the triodes Q2 and Q4 are driven by utilizing the static electricity disturbance of the human body. Since Q3 is off at this time, the motor is stopped to execute the automatic contact stop function of the shredder.

  Next, a second embodiment of the shredder contact safety protection device according to the present invention will be described. The description will be mainly focused on differences from the first embodiment. In the second embodiment, each LED display is added to the first embodiment.

  As shown in the circuit diagrams of FIGS. 2 and 4, according to the second embodiment of the present invention, the biovoltage control switch circuit 34 includes a first switch triode Q3. The base electrode of the first switch triode Q3 is connected to the conductive touch panel 32 via series-connected resistors R6 and R7, and the base electrode is grounded via a second resistor R8 connected in parallel to the first capacitor C3 and the diode D4. Has been. The collector of the first switch triode Q3 is connected to the power supply VCC via a power supply display LED and a contact display LED3 connected in parallel, and its emitter is connected to the input control terminal of the ground switch circuit 35.

  The ground switch circuit 35 is a switch transistor circuit, and includes a second switch triode Q2. The base electrode of the second switch triode Q2 is an output terminal of the biovoltage control switch circuit 34, that is, the first switch triode Q3. The emitter of the second switch triode Q2 is connected to the emitter, and the collector thereof is connected to the input control terminal of the control circuit unit 3.

As shown in FIG. 4, according to the second embodiment of the present invention, the shredder contact safety protection device and the shredder equipped with the same
(1) Switch LED display, (2) Contact protection LED display, (3) Overload, overload LED display, (4) Power supply display, (5) Light-operated document shredding, (6) Document shredding, close and Each function has a reverse running function.

  As shown in FIG. 4, removing resistors R18, R14, R13, R11, R12, LED1, LED2, diodes D10, D9, D6, constant diode ZD2, capacitor C5, and silicon controlled rectifier SCR, the device is overloaded and Since the switch LED display function is removed, the circuit can be applied to intermediate devices.

  Also, when resistors R18, R14, R13, R11, R12, R16, R17, LED1, LED2, LED3, diodes D10, D9, D6, D12, D13, constant diode ZD2, capacitor C5, silicon controlled rectifier SCR and triode Q4 are removed. Since the functions of the overload, overload display, power supply display and switch display are removed from the device, the circuit can be applied to a low-level device.

  Further, the control circuit power supply circuit cuts down the voltage by using a resistor-capacitor, and the 24V low voltage control circuit power supply passes through the resistors R1, R2, capacitors C1, C2, diodes D1, D2 and the constant voltage diode ZD1. Supplied from the electric wire. The potential difference between the positive pole of the power supply and the zero line of the control circuit is 24V, which is much lower than the safety voltage of the human body, so there is no danger to humans or animals. The human body contact metal portion is connected to the base electrode of the triode Q3 via two resistors R6 and R7, and drives the triodes Q2 and Q3 by utilizing the static electricity disturbance of the human body. Since Q1 is off, the motor is stopped to execute the human body contact automatic stop function of the document shredding machine.

  The bridge rectifier circuit can be applied to supply power to the contact circuit, and the optical coupler can be used to isolate the motor control circuit, so that more stable device operation is realized.

  The principle of automatic contact stop in the present embodiment is as follows.

(A) When the shredder is in a document shredding or reverse running state, when the human body touches the panel metal part, the resistors R7, R6, R8, the diode D4, and the capacitor C3 form a triode base electrode power supply circuit, and the triode Q3 Is conducted, and the triode Q2 is conducted based on the base electrode voltage.

  When the triode Q2 becomes conductive, its collector voltage becomes low, the touch display light and the resistor R5 form a loop, and the touch display light is turned on. The base electrode voltage of Q5 becomes low based on the conduction of the diode D16. When the device is in the reverse running state, the triode Q5 is cut off based on the low base electrode voltage and the device stops.

  When the shredder is in the document shredding state, the base electrode voltage of the triode Q1 becomes low based on the conduction of the diode D15, the triode Q1 is cut off, the relay is switched off, and the shredding machine part 1 stops. Provide safety protection.

(2) The shredder is stopped when the human body comes into contact, and when the human body leaves the shredder, the triode Q3 is cut off because there is no base electrode conduction voltage, and the shredder resumes normal operation.

  The operating principle of the power supply display circuit is as follows.

  As shown in FIG. 4, the power indicator light, resistors R17, R16, and triode Q4 constitute a basic power indicator light. When the function switch is in the stop state, the power indicator light is connected to the conduction circuit of the emitter of toled Q4. It ’s not turned off.

  When the function switch is in the reverse running position, the emitter of the triode Q4, the diode D12, and the function switch form a conduction circuit, and the power indicator light is turned on. When the function switch is in the document shredding state, the emitter of the triode Q4, the diode D13, and the function switch form a conduction circuit, and the power indicator light is turned on.

  The contact safety protection device for shredders of the first and second embodiments includes the bio-voltage control switch circuit 34 and the ground switch circuit 35 connected in series, and the input control terminal of the bio-voltage control switch circuit 34 is connected to the paper input port of the shredder. Connected to the touch panel 32, the output terminal of the bio voltage control switch circuit 34 is connected to the input control terminal of the ground switch circuit 35, and the output terminal of the ground switch circuit 35 is connected to the input control terminal of the control circuit unit 3.

  As a result, when the human body comes into contact with the conduction touch panel 32, both the bio voltage control switch circuit 34 and the ground switch circuit 35 are brought into conduction by the biocurrent of the human body, and even if the power switch is on, the command of the control circuit unit 3 Thus, the document shredding machine unit 1 stops operating.

  Therefore, the shredder contact safety protection device according to the present invention and the shredder equipped with the shredder protect the human body from accidental damage, realize real-time safety monitoring, and the entire control has a simple circuit configuration and reliability. It is performed safely and with high sensitivity due to its operational performance, and it is convenient for handling and can be used widely with safety.

  While the invention has been particularly illustrated and described with reference to preferred embodiments, it is understood by those skilled in the art that it is understood in the claims. Various changes in form and detail are possible without departing from the spirit and scope of the invention. Accordingly, it should be understood that these examples are given by way of illustration only and are not intended to be limiting.

The circuit principle figure which shows the function of the shredder by a prior art. The block block diagram containing the contact safety protection apparatus for shredders which concerns on this invention. The circuit principle figure of the 1st Example of the contact safety protection apparatus for shredders which concerns on this invention. The circuit principle figure of the 2nd Example of the contact safety protection apparatus for shredders which concerns on this invention. The flowchart which shows control of the contact safety protection apparatus for shredders which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Document shredding machine part 2 Motor drive circuit unit 3 Control circuit unit 4 Contact detection circuit unit 5 Document input detection circuit unit 6 Overload protection circuit unit 7 Motor reverse running detection circuit unit 81 Power supply interface circuit 82 Safety switch 83 Fuse 84 Control Switch 85 Power supply circuit for control circuit 86 Document shredding function switch C7 First capacitor C8 Second capacitor D4, D5, D6 Diode IR1 Light dependent diode Q2 Second switch triode Q3 First switch triode Q4 First switch triode R5 1st resistor R6 2nd resistor R7 4th resistor R8 2nd resistor R16 3rd resistor U1 Optical coupler VCC Power supply ZD1 Constant voltage diode

Claims (13)

A shredder contact safety protection device comprising a functional circuit unit for operating and controlling the shredder document shredding machine unit and a conductive touch panel installed at the document input port of the shredder,
The functional circuit unit includes a power supply unit, a motor drive circuit unit, a control circuit unit, and a contact detection circuit unit,
The control circuit unit is connected to the document shredding machine unit via a motor drive circuit unit, and is connected to a conductive touch panel via a contact detection circuit unit. The power supply unit is connected to the control circuit unit and the motor drive circuit unit. Connected to each of the
The contact detection circuit unit includes a bio voltage control switch circuit and a ground switch circuit for detecting a bio current of a human body, an input control terminal of the bio voltage control switch circuit is connected to the conductive touch panel, and an output terminal of the control switch circuit Is connected to the input control terminal of the ground switch circuit, and the output terminal of the ground switch circuit is connected to the input control terminal of the control circuit unit.   The shredder contact safety protection device according to claim 1, wherein the bio voltage control switch circuit is a switch transistor circuit.   The bio-voltage control switch circuit includes a first switch triode, a base electrode of the first switch triode is connected to the conductive touch panel via a first resistor, and the base electrode is connected in parallel to the first capacitor. The collector of the first switch triode is connected to the power supply, the emitter is grounded via a third resistor connected in parallel to the second capacitor, and the emitter is connected to the input control terminal of the ground switch circuit. The contact safety protection device for a shredder according to claim 2, wherein the contact safety protection device is connected.   The contact safety protection device for a shredder according to claim 3, wherein the collector of the first switch triode is connected to a power source via a power display LED and a contact display LED connected in parallel.   The shredder contact safety protection device according to any one of claims 1 to 4, wherein the ground switch circuit is a switch transistor circuit.   The ground switch circuit includes a second switch triode, a base electrode of the second switch triode is connected to an output terminal of the biovoltage control switch circuit, an emitter of the second switch triode is grounded, and a collector thereof The shredder contact safety protection device according to claim 5, wherein the contact safety protection device is connected to an input control terminal of the control circuit unit.   The collector of the second switch triode is connected to a power source via a fourth resistor, and the collector is connected to an input control terminal of the control circuit unit via an optical coupler. Contact safety protection device for shredder as described.   The control circuit unit is further connected to a document insertion detection circuit unit, and the document insertion detection circuit unit includes an LED and a light dependent diode, and a light emitting portion of the LED corresponds to a light sensing portion of the light dependent diode. The contact safety protection device for a shredder according to any one of claims 1 to 4, wherein each of the contact safety protection devices is placed on a wall on a side of the shredder facing a document input port.   The shredder contact safety protection device according to any one of claims 1 to 4, wherein the control circuit unit is further connected to an overload protection circuit unit. The shredder contact safety protection device according to claim 1, wherein the control unit is further connected to a motor reverse running detection circuit unit. The contact safety protection device for a document shredder according to any one of claims 1 to 4, wherein the power unit includes a power interface circuit, a safety switch, a fuse, a control switch, a power circuit for the control circuit, Including a document shredding function switch,
The power interface circuit is connected to the motor drive circuit unit through each of a safety switch, a fuse, a control switch, and a document shredding function switch,
The shredder contact safety protection device according to any one of claims 1 to 4, wherein the fuse is connected to the control circuit unit via a control circuit power supply circuit.   The shredder contact safety protection device according to claim 11, wherein the control switch is a kind of relay switch.   A shredder contact safety protection device according to any one of claims 1 to 12, a document shredding machine part for shredding a document, and a shredded object shredded by the document shredding machine part. A shredder comprising a storage box.

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