JP2015107440A - Shredder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shredder having low-cost, highly-reliable shredded-paper-detecting means that is unlikely to be affected by paper powder during shredding.SOLUTION: Each time the start switch of a shredder is turned on, pulse light is emitted from the light emitting part of a shredded paper detection sensor. An analog voltage output from a light receiving part according to the intensity of received pulse light is output to a CPU. A control section has correcting means for making a correction up to an analog voltage value for factory shipment, stored in the CPU in advance. Therefore, even if the analog voltage output from the light receiving part decreases due to, for example, adhesion of shredded paper powder to the light emitting part and light receiving part, erroneous determination by the shredded paper detection sensor is unlikely to occur.

Description

  The present invention relates to a shredder having a function of automatically starting shredding when an object to be shredded such as paper, plastic film or the like that has become unnecessary is inserted and automatically stopping when shredding is completed.

For shredders that shred unnecessary paper or plastic film, etc., as a means to detect the shredded objects that have been thrown in, a device that uses a transmissive photosensor or a contactless switch that uses a reflective photosensor. A shredder having shredder detection means has been proposed.

Japanese Examined Patent Publication No. 2-29378

  The shredder described in Patent Document 1 is a device in which a light-emitting element and a light-receiving element are opposed to each other with a document insertion opening interposed therebetween, and a motor is started when a document to be shredded is inserted therebetween. The light emitting element is driven by a pulse with a fixed period, this light is detected by the light receiving element, detected, and the capacitor is charged by the output. When the document is input, the light pulse of the light receiving element Since there is no output, the capacitor is not charged and the potential drops. The electric potential of both ends of the capacitor is detected and the motor is energized when the electric potential falls below a certain level.

In the detection means using a non-contact switch using an optical sensor, in the case of a transmissive optical sensor, the light between the sensors is gradually attenuated by the fine paper dust generated at the time of shredding adhering to the light emitting side and the light receiving side, When the amount of light reaches the level at the time of blocking, there is a possibility of erroneous detection that a shredded object has been introduced. For this reason, it is necessary to take measures against malfunctions of paper dust.

The above problem is the same when a reflective optical sensor is used. Both the light emitting part and the light receiving part are installed toward the opposite side wall, and the side wall is painted black in order to reduce the reflectance. When the object to be shredded is inserted, the reflecting object comes close to the light emitting unit and the light receiving unit, so that the amount of light received increases because the reflected light from the object to be shredded is received. It is possible to detect the insertion by setting the amount of light received by the light receiving unit when the object to be cut is inserted as a reference value and comparing the actual amount of received light with this. However, if paper dust adheres to the light emitting part or the light receiving part, the amount of light received by the light receiving part decreases, and even if a shredded object is inserted, the light receiving part cannot obtain a sufficient amount of light, and the motor starts. There was a risk of malfunction. As described above, both the transmission type sensor and the reflection type sensor require measures for reducing the light amount of the optical sensor due to paper dust.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a shredder having a cheap and highly reliable shredded paper detection means that is not easily affected by paper dust during shredding. .

In the invention described in claim 1, the shredder is provided with a shredder detecting means for detecting the insertion of a shredded object, and the shredder detecting means includes a light emitting portion and a light receiving portion. The light receiving unit receives the pulsed light from the light emitting unit, and includes correction means for correcting the output of the light receiving unit to be a preset initial setting value.

In the invention according to claim 2, the correction means sets the initial set value when the output of the light receiving unit is equal to or less than the initial set value and is within a correction range of a preset threshold value. It is characterized by correcting to.

The invention described in claim 3 is characterized in that it comprises a notifying means for prompting cleaning of the light emitting part and the light receiving part when it is below the threshold and exceeds the correctable range.

  According to a fourth aspect of the present invention, the output of the light receiving unit is an analog voltage output according to the intensity of the received pulsed light.

  The invention according to claim 5 is characterized in that the initial set value is the analog voltage value output from the light receiving unit stored in the CPU at the time of factory shipment.

  In the invention described in claim 6, the frequency of the pulsed light emitted from the light emitting section is set to a frequency other than the commercial frequency of 50 Hz or 60 Hz and a natural number multiple thereof.

  In the invention according to claim 7, the shredder includes an insertion port for a shredded object, shredding means for shredding the shredded object, shredded scraps shredded by the shredding means, and the like. And a shredded waste storage portion that is received by being dropped, and the light emitting portion and the light receiving portion are disposed to face the insertion port of the shredded object.

  According to the present invention, every time the start switch of the shredder is turned on, the pulsed light is emitted from the light emitting unit of the shredded paper detection sensor, and the analog voltage output from the light receiving unit according to the intensity of the received pulsed light. Is corrected to the initial factory voltage value stored in the CPU, so that even if shredded paper powder adheres to the light emitting part and the light receiving part, it is difficult for the shredded paper detection sensor to make an erroneous determination. A shredder having a highly reliable shredded paper detecting means can be provided.

The perspective view of the shredder of this embodiment The perspective view which shows the state in which the cover of the shredder of FIG. 1 was opened. 1 is a vertical sectional view of the shredder of FIG. The perspective view inside a shredder for demonstrating the installation state of a shredding mechanism part Block diagram showing schematic electrical configuration of shredder Flow chart for shredder drive control

  Preferred embodiments of the present invention will be described below with reference to the drawings. Note that this embodiment is merely an example, and the present invention is not limited to this.

    As shown in FIGS. 1 to 3, the shredder 1 includes a rectangular parallelepiped casing 2 (box body) formed of sheet metal and a rectangular parallelepiped in which waste paper provided on the casing 2 is disposed. A shredded paper storage space 4 and a cover 3 are provided to be openable and closable so as to cover the shredded paper storage space 4. The cover 3 is provided with an external insertion port 31 for shredded paper. An auto feed mechanism 5 that guides the shredded paper downward is configured at the bottom of the shredded paper storage space 4, and further below the auto feed mechanism 5, a shredded paper that shreds the shredded paper. A cutting mechanism 6 is provided. Below the shredding mechanism 6 is a shredded waste storage box 7 for storing shredded waste.

  As shown in FIGS. 2 and 3, the auto feed mechanism 5 has a slit shape in which the shredded paper enters in the direction perpendicular to the longitudinal direction of the shredded paper near the center of the bottom of the shredded paper storage space 4. Insertion port 51 is provided. The guide rollers 52 having axes parallel to the slit direction at symmetrical positions across the slit-shaped insertion port 51 are arranged in pairs at predetermined intervals in the axial direction of the shaft 53 serving as the rotation support shaft. Are arranged in series.

As shown in FIG. 3, the shredding mechanism 6 is equipped with a pair of shredder cutters 61 arranged with an axis parallel to the central axis of the guide roller 52. A gap between the shredder cutters 61 is located immediately below the insertion port 51 described above. The shredder cutter 61 is rotationally driven by the motor 64 and the gear device 65 (FIG. 4), but the guide roller 52 and the shredder cutter 61 on the same side across the insertion port 51 are synchronously driven by the transmission gear and are in the same direction. Rotate. The shredded paper that has passed through the insertion port 51 is guided into the gap between the shredder cutter 61 by the guide roller 52 and is shredded. The shredder cutter 61 is covered with a cover 63 formed by bending a thin sheet metal for safety.

The operation of the shredder 1 configured as described above will be described. When the amount of shredded paper is small, the shredded paper is inserted from the external insertion port 31 formed in the cover 3. The inserted shredded paper passes through the insertion guide portion 36, passes between the guide rollers 52, is guided to the insertion port 51, and is shredded by the shredding mechanism portion 6. (Figure 3)

Next, a case where a large amount of shredded paper is shredded will be described. As shown in FIGS. 2 and 3, the shredded paper is placed in the shredded paper storage space 4 and the cover 3 is closed. At this time, the lower surface of the waste paper near the center of the shredded paper storage space 4 is slightly raised by the guide roller 52, and the upper surface of the bundle of shredded paper is pressed by the paper pressing pad 33. The central portion of the shredded paper is pressed by the pressure paper portion 37 located inside the pressing roller 32. As a result, the shredded paper swells in an arc shape toward the insertion port 51 side and easily enters the insertion port 51.

  When the motor 64 is driven in this state, the lowermost sheet to be shredded is drawn into the insertion port 51 by the guide roller 62, is folded in two, enters the shredder cutter 61 below the insertion port 51, and is shredded. The This pulling operation is continuously performed, and is folded into two in order from the lowermost sheet to be shredded and guided to the shredder cutter 61 and shredded.

As shredding progresses and the height of the bundled waste paper becomes smaller, the pressure spring 37 and the pressure roller 32 and the paper press pad 33 are urged downward by the coil spring 35 of the cover 3, so the waste paper Will always be pressed. The shredded scrap 9 is stored in a shredded waste storage box 7 below the shredded scrap 9.

  Next, the shredded paper detection sensor 10 relating to the present invention will be described. The shredded paper detection sensor 10 includes a light emitting unit 10a and a light receiving unit 10b (not shown). As shown in FIG. 2, the light emitting unit 10 a and the light receiving unit 10 b are a substantially central portion in the longitudinal direction of the insertion port 51 provided at the bottom of the shredded paper storage space 4, and a pair of guides forming the insertion port 51. It is installed so as to face the walls 51a and 51b. The light emitting unit 10a is a light emitting diode that emits infrared light, and the light receiving unit 10b arranged to face the light emitting unit 10a is a phototransistor that detects radiation emitted from the light emitting diode. The light emitting unit 10a and the light receiving unit 10b are protected by light transmissive transparent windows 54a and 54b formed of, for example, an acrylic or polycarbonate plastic material disposed on the front surfaces facing each other.

In the shredded paper detection sensor 10, when the pulsed light emitted from the light emitting diode of the light emitting unit 10a is received by the phototransistor of the light receiving unit 10b, the pulse is detected by a circuit unit (not shown), and according to the intensity of the received light. The analog voltage V is output. The frequency of the pulsed light emitted from the light emitting unit 10a is preferably set to a frequency other than the commercial frequency of 50 Hz or 60 Hz and a natural number multiple thereof. The reason is that the frequency of the pulsed light interferes with the frequency of the power source and may cause undulation in the output signal, which may cause malfunction.

Next, FIG. 5 shows an electrical configuration of the shredder. The control unit 20 that controls the whole includes a CPU 40 of a microcomputer, and is connected to a shredded paper detection sensor 10, a shredder detection device 15, and an operation panel (display device) 21.

  The CPU 40 operates a driver (not shown) that drives the light emitting unit 10a of the shredded paper detection sensor 10 to emit pulsed light from the light emitting diode. When the shredded paper passes between the light emitting unit 10a and the light receiving unit 10b, light attenuation (attenuation) occurs, and an analog voltage is output according to the intensity of the pulsed light received by the light receiving unit 10b. This analog voltage is input from the A / D input port of the CPU 40 and converted into a digital signal. When the analog voltage is equal to or lower than a preset voltage threshold value, the triac 16 that drives the rotation driving motor 64 of the shredder cutter 61 is operated.

  The amount of light reduction varies depending on the material, thickness, and the like of the shredded paper, but if paper dust generated during shredding adheres to the transparent windows 54a and 54b, it becomes a light reduction factor other than the shredded paper. When the adhesion of paper dust increases and the amount of light reduction increases, the voltage for operating the triac 16 that drives the rotation drive motor 64 of the shredder cutter 61 even if the cut paper does not pass through the shredded paper detection sensor 10. A malfunction occurs that the shredder cutter 61 is actuated by determining that the threshold value has been reached.

  Therefore, in this embodiment, when the shredder 1 is shipped from the manufacturing factory, the light emitting unit 10a of the shredded paper detection sensor 10 is driven in a state before the shredded paper powder adheres to the transparent windows 54a and 54b. Then, pulsed light is emitted from the light emitting diode, and the analog voltage output by the light receiving unit 10b is received and recorded in the CPU 40 as an initial set value.

  A case where the shredding process of the shredder 1 is automatically controlled by the CPU 40 will be described with reference to the flowchart of FIG.

  When the power is turned on and the start switch is turned on, a driver (not shown) is driven by an output signal from the CPU 40. As shown in FIG. 6, in step S <b> 1, the shredder detection device 15 determines whether shredded waste is full, and if it is full, the LED of the display unit 22 is lit to indicate that it is full. . If the shredder detection device 15 determines that the shredded waste is not full, the process proceeds to the next step S2.

  In step S2, a driver (not shown) that drives the light emitting unit 10a of the shredded paper detection sensor 10 is operated to emit pulsed light from the light emitting diode. In step S3, the CPU 40 determines whether the analog voltage output according to the intensity of incident light entering the light receiving unit 10b is the same as the initial setting value.

  If the analog voltage is less than or equal to the initial set value, the process proceeds to step S9. A threshold value is set in advance for the voltage input from the light receiving unit 10b to the CPU 40. If the threshold value is within the correctable range, the process proceeds to step S10, and the analog voltage output from the light receiving unit 10b is set to the initial setting value. The correction is executed and the process proceeds to step S2. When the correction range is exceeded below the threshold, the LED of the display unit 22 is turned on to notify the user of the abnormality of the shredded paper detection sensor 10 and to protect the light emitting unit 10a and the light receiving unit 10b. Encourage them to wipe off dirt on windows or shredded paper dust. The correctable range is determined in consideration of the AD port operating range of the CPU 40 and ambient noise. In this embodiment, 1.0 V is set as the lower limit threshold, and the upper limit threshold is set as an initial set value. The initial setting value is around 3.85V.

  If the analog voltage at the light receiving unit 10b is equal to the initial set value, the process proceeds to step S4, and if the shredded paper detection sensor 10 detects the shredded paper and is ON, the process proceeds to step S5 to drive the cutter. The motor 64 is driven.

  In step S5, the cutter driving motor 64 is driven to rotate the shredder cutter 61, and the shredded paper is guided into the gap between the shredder cutter 61 and shredded. Shredded scraps after shredding are dropped into shredded waste storage box 7 and stored therein.

  Next, it progresses to step S6, and if the analog output voltage from the said light-receiving part 10b is below a threshold value, step S4 * S5 * S6 will be repeated. If the analog output voltage exceeds the threshold value, it is determined that the shredded paper has not been inserted, and the process proceeds to steps S7 and S8. Then the power is turned off. Step S4 to Step S8 are repeated until the predetermined time has not elapsed.

  As described above, each time the start switch of the shredder is turned ON, pulse light is emitted from the light emitting part of the shredded paper detection sensor, and the analog voltage output by the light receiving part is determined according to the intensity of the received pulsed light. Input to CPU. Since the control unit is provided with correction means for correcting to the analog voltage value at the time of shipment from the factory stored in advance in the CPU, the light receiving unit is caused by the adhering of shredded paper powder to the light emitting unit and the light receiving unit. It is possible to provide a shredder having a highly reliable shredded paper detection means that is unlikely to cause an erroneous determination of the shredded paper detection sensor even if the analog voltage to be output is lowered.

DESCRIPTION OF SYMBOLS 1 Shredder 2 Case 3 Cover 4 Waste paper storage space 5 Auto feed mechanism 6 Shredding mechanism part 7 Cutting waste storage box 10 Shredded paper detection device 10a Light emitting part 10b Light receiving part 15 Shredded waste detection sensor 16 Triac 20 Control part 21 Operation panel (display device)
22 display unit 40 CPU

Claims (7)

A shredder provided with shredder detection means for detecting the introduction of shredded objects,
The shredded object detecting means includes a light emitting part and a light receiving part,
A shredder comprising correction means for receiving pulsed light from the light emitting unit by the light receiving unit and correcting an output of the light receiving unit to a preset initial setting value.   The correction means corrects the light receiving unit so as to be the initial set value when the output of the light receiving unit is equal to or less than the initial set value and is within a preset threshold value correctable range. The shredder according to 1.   The shredder according to claim 2, further comprising a notification unit that prompts cleaning of the light emitting unit and the light receiving unit when the correction value is equal to or less than the threshold value and exceeds the correctable range.   The shredder according to any one of claims 1 to 3, wherein the output of the light receiving unit is an analog voltage output according to the intensity of the received pulsed light.   The shredder according to claim 4, wherein the initial setting value is the analog voltage value output from the light receiving unit stored in the CPU at the time of factory shipment.   5. The shredder according to claim 1, wherein the frequency of the pulsed light emitted from the light emitting unit is set to a frequency other than a commercial frequency of 50 Hz or 60 Hz or a natural number multiple thereof. The shredder has an insertion port for a shredded object,
Shredding means for shredding the shredded object;
A shredded waste storage section in which shredded waste and the like shredded by the shredding means are dropped and stored, and
The shredder according to any one of claims 1 to 6, wherein the light emitting unit and the light receiving unit are installed to face an insertion port of the shredded object.

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