JPH0724348A - Shredder - Google Patents

Abstract

PURPOSE:To ensure that ordinary paper sheets can be effectively recycled separately from OHP forms. CONSTITUTION:Paper sheets 12 which are sent into a main device system one by one by a feeding roll 15 are checked by a microswitch 21 which detects the tip of each sheet. In this case, permeability sensors 18, 19 measure a permeability at the tip. Consequently, the OHP sheet whose permeability is high is distinguished as a special paper sheet from the ordinary paper sheet. These different types of paper sheets are shredded using shredding rolls 23, 24, and are separately stored in specified storage parts 28, 29 by a storage switching plate 25 in accordance with the classification of the separated paper sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shredder for cutting paper, and more particularly to a shredder suitable for recycling paper.

[0002]

2. Description of the Related Art In the office, an apparatus for recording information on a sheet such as a copying machine or a printer and an apparatus for utilizing information written on the sheet such as an overhead projector are widely used. Some of these sheets achieve their intended use in a short period of time, and some of them are bound in a file and stored for a long period of time. However, it is usual that the stored sheets will eventually be discarded. As a result, a large amount of paper is used every day in the office, and a large amount is discarded.

Recently, awareness of environmental damage has increased, and the momentum for recycling paper has also increased. Therefore, it has become widely recognized that documents with high confidentiality should be cut with a shredder and reused rather than incinerated into ash.

[0004]

However, as the paper, a so-called normal paper in which plant fibers are entangled with each other and glued together (hereinafter, referred to as plain paper in this specification) is used for an overhead projector (OHP). There are papers other than plain papers (hereinafter collectively referred to as special papers) such as OHP papers manufactured by chemical substances and metal sheets. In the office, various types of paper are used according to various purposes, especially OHP in special paper.
There is a high probability that confidential information will be written on the paper.

However, OHP has been conventionally used for shredders.
The use of special paper such as paper is often prohibited. This is a limitation imposed from the viewpoint of recycling paper resources, and it is virtually impossible to separate plain paper and special paper from finely cut paper. Therefore, for example, in a department that uses OHP paper, it is necessary to divide the paper to be cut into plain paper and special paper. Such work is sometimes quite complicated. For example, when storing multiple OHP sheets,
In order to prevent image information such as a toner image attached to one side from being transferred to the other OHP sheet, thin sheets (plain paper) are often sandwiched between the respective sheets. In such a case, the operator needs to sort these one by one.

The sorting of sheets is disclosed in, for example, Japanese Patent Application Laid-Open No. 2-327842. Here, in a thermal color printer, OHP paper and plain paper are discriminated by a reflection type sensor and a pinch detection means.
Further, in Japanese Patent Application Laid-Open No. 2-97276, these papers are discriminated and whether or not an image can be formed is determined based on the result. These merely disclose a method of discriminating a sheet, and do not solve the problems in the shredder as described above.

Therefore, it is an object of the present invention to provide a shredder which can effectively recycle paper.

Another object of the present invention is to provide a shredder capable of selecting whether or not cutting is possible depending on the type of paper.

[0009]

According to a first aspect of the present invention, there is provided a sheet detecting means for detecting a sheet, a characteristic detecting means for detecting a characteristic of the sheet detected by the sheet detecting means, and a characteristic of the detected sheet. Comparison means for comparing with a predetermined reference value, paper sorting means for sorting the paper into one of two types according to the result of the comparison, and when the sorted paper is one of the predetermined types, this is selected. The shredder is provided with a cutting means for cutting and a storing means for storing the paper after cutting or the paper which has not been cut.

That is, according to the first aspect of the present invention, the sheet to be conveyed or manually fed is detected, the characteristic thereof is detected, and the detection result is compared with a predetermined reference value. Select crab. Then, according to the result of the selection, when one kind of paper is cut, it is cut and when the other kind of paper is not cut. The paper that has been cut or not cut is stored in the storage means and is used for recycling or the like depending on the selection result.

According to the second aspect of the present invention, the sheet detecting means for detecting the sheet, the characteristic detecting means for detecting the characteristic of the sheet detected by the sheet detecting means, and the characteristic of the detected sheet are compared with a predetermined reference value. Comparing means, a paper selecting means for selecting the paper into one of two types according to the comparison result, a cutting means for cutting the selected paper, and a paper after cutting for each kind selected by the paper selecting means. The shredder is provided with a storage means for storing paper.

That is, according to the second aspect of the present invention, the sheet to be conveyed or manually fed is detected, its characteristic is detected, and the detection result is compared with a predetermined reference value. Select crab. Then, the cut sheets are cut, and the cut sheets are stored in separate storing means according to the types selected by the sheet selecting means, and are used for recycling or the like.

According to the third aspect of the present invention, the sheet detecting means for detecting the sheet, the transmissivity detecting means for detecting the transmissivity of the sheet detected by the sheet detecting means, and the detected transmissivity of the sheet as a predetermined reference. A comparing means for comparing with a value, a paper selecting means for selecting a paper into one of two types according to the comparison result, a cutting means for cutting the selected paper, and a type selected by the paper selecting means. The shredder is provided with a storing means for storing the cut sheets.

That is, according to the third aspect of the invention, the sheet to be conveyed or manually fed is detected, the transmittance thereof is detected, and the detection result is compared with a predetermined reference value. Select one. Then, the cut sheets are cut, and the cut sheets are stored in separate storing means according to the types selected by the sheet selecting means, and are used for recycling or the like.

According to another aspect of the present invention, the sheet detecting means for detecting the sheet, the electrical conductivity detecting means for detecting the electrical conductivity of the sheet detected by the sheet detecting means, and the electrical conductivity of the detected sheet are set to a predetermined value. Comparing means for comparing with one reference value, paper sorting means for sorting the paper into normal paper using plant fibers and other paper according to the comparison result, and cutting means for cutting the sorted paper The shredder is provided with a storage means for storing the cut sheets according to the types sorted by the sheet sorting means.

That is, in the invention described in claim 4, the paper conveyed or manually fed is detected, the conductivity thereof is detected, and the detection result is compared with two predetermined reference values. There are two types of paper: normal paper used, high resistance paper such as chemical fiber, and low resistance paper such as metal sheet. Then, the cut sheets are cut, and the cut sheets are stored in separate storing means according to the types selected by the sheet selecting means, and are used for recycling or the like.

[0017]

EXAMPLES The present invention will be described in detail below with reference to examples.

FIG. 1 shows an outline of the internal structure of a shredder in one embodiment of the present invention. A part of the upper surface of the apparatus main body of the shredder 10 constitutes a cutting tray 11, on which sheets 12 to be cut can be stacked. On the upper panel 13, an operation panel 14 for arranging the start of cutting work and designating work contents is arranged. The stacked paper 12 is the cutting tray 1
1 is fed into the main body of the apparatus by a feed roll 15 arranged below. A pair of transport rolls 16 and 17 are provided in the transport path of the fed paper 12.
The transmittance sensors 18 and 19 and the micro switch 21 each including a pair of optical sensors are arranged in this order.
The transmissivity sensors 18 and 19 are sensors for measuring the transmissivity when the microswitch 21 detects the front end of the paper 12, and are composed of a light emitting element and a light receiving element.

A paper guide 22 curved in an arc is arranged behind the micro switch 21, and 1 is provided below the paper guide 22.
A pair of cutting rolls 23, 24 and a swingable storage switching plate 2
5 are arranged. A storage box 26 made of transparent plastic is formed in a relatively large space below the storage switching plate 25.
Is arranged so that it can be pulled out freely. The storage box 26 is divided into two by a partition plate 27, and the space on the left side in the drawing is a plain paper storage section 28, and the space on the right side is a special paper storage section 29. When a full sensor 31, 32 consisting of a pair of optical sensors is attached at a predetermined position of the device body in which the storage box 26 is stored, and these operate at a predetermined timing to fill the cut sheet. Is to be detected.

FIG. 2 shows an outline of the circuit configuration of this shredder. This shredder has a CPU (Central Processing Unit) 41 for controlling the cutting of the paper. The CPU 41 is connected to each unit in the device through a bus 42 such as a data bus. Of these, ROM43
Is a read-only memory that stores programs for performing various controls and predetermined fixed data. A typical fixed data is a reference value that is a decisive factor for determining whether the paper is plain paper or special paper. A RAM (Random Access Memory) 44 is a working memory for temporarily storing data required for controlling the shredder. This R
A part of the AM 44 is backed up by a battery (not shown) and constitutes a non-volatile memory area. In the non-volatile memory area, an adjustment value (increase / decrease value) with respect to a reference value, which is a deciding factor for the above-mentioned plain paper or special paper, is written. The input / output circuit 45 is a circuit for inputting data from the operation panel 14 and outputting data on the operation panel 14.

The first solenoid drive circuit 46 is a circuit for controlling the drive of the cutting roller solenoid 47 for temporarily separating the pair of cutting rolls 23, 24 from each other. When the cutting roller solenoid 47 is excited,
The distance between the pair of cutting rolls 23 and 24 is larger than a predetermined distance, and the paper 12 guided by the paper guide 22 passes through between them and passes through the plain paper storage unit 28 or the special paper storage unit 2.
9 is stored without cutting. When the cutting roller solenoid 47 is not excited, the pair of cutting rolls 23 and 24 cut the paper by rotating. The carry motor control circuit 48 is a circuit that controls driving of the carry motor 49. The transport motor 49 is used to feed the paper 12
It is a motor used for carrying (FIG. 1). The cutting motor control circuit 51 is a circuit that controls driving of the cutting motor 52. The cutting motor 52 is used for cutting the paper 12 1
This is a motor for rotating the pair of cutting rolls 23, 24.

The second solenoid drive circuit 53 is a circuit for controlling the excitation of the storage switching plate solenoid 54. The storage switching plate solenoid 54 is the storage switching plate 25 shown in FIG.
Used to control the position of the. That is, the storage switching plate 25
Is always in the position shown by the solid line in FIG. 1 by a spring (not shown), and in this state, the paper cut by the cutting rolls 23 and 24 is stored in the plain paper storage unit 28. When the storage switching plate solenoid 54 is excited, the storage switching plate 25 rotates about its fulcrum to the position shown by the dotted line in FIG. 1 and stops. In this state,
The paper cut by the cutting rolls 23 and 24 is stored in the special paper storage unit 29. The clutch control circuit 55 transmits the driving force of the carry motor 49 to one or a plurality of clutches 56 to feed the feed roll 15 and the carry roll 1.
The drive timings of 6 and 17 are controlled. The sensor input / output control circuit 57 includes the micro switch 2
1 and the transmittance sensor 18, 1
9 and the full sensors 31, 32 are configured to perform light emission control on the light emitting element side and detect signals output from the light receiving element side.

FIG. 3 shows the construction of the operation panel of this shredder. A start button 61 for starting cutting and an emergency stop button 62 for performing an emergency stop are arranged in the center of the operation panel 14.
A mode selection button 63 is arranged on the left side of the emergency stop button 62. By pressing the mode selection button 63 in order, the shredder cuts only plain paper into a plain paper single cut mode, and a special paper single cut to cut only special paper. The mode is cyclically switched to three modes: plain paper / special paper cutting mode, which cuts while selecting plain paper and special paper. A plain paper cut indicator 64 and a special paper cut indicator 65 are arranged above the mode selection button 63, and these lights up in a mode in which the corresponding paper is cut. A full indicator 66 is arranged on the right side of the start button 61. Full indicator 6
Reference numeral 6 is lit when the full sensors 31, 32 detect the full state of the cut paper.

FIG. 4 shows the flow of the mode change work of the shredder of this embodiment. When a power source (not shown) for this shredder is turned on, the CPU 4 shown in FIG.
1 reads out the current mode stored in the nonvolatile memory area of the RAM 44 based on the mode changing program written in the ROM 43 (step S10).
1). Then, based on this mode, a control signal is sent to the input / output circuit 45 to control the lighting of the plain paper cut indicator 64 and the special paper cut indicator 65 (step S102). That is, if the plain paper single cut mode is written in the nonvolatile memory area, only the plain paper cut indicator 64 is turned on, and if the special paper single cut mode is written, only the special paper cut indicator 65 is displayed. Turn on the light. On the contrary,
When the plain paper / special paper cut mode is written, both the plain paper cut indicator 64 and the special paper cut indicator 65 are turned on.

In this state, the CPU 41 monitors the depression of the mode selection button 63 (step S103). Then, each time the operator presses the mode selection button 63,
The above three modes are cyclically specified.
For example, if the current mode is the plain paper single cut mode when the mode selection button 63 is pressed (step S104; Y), the data indicating the mode written in the nonvolatile memory area is cut into the special paper single cut. The mode is changed (step S105). Then, CPU4
1 performs reading in this mode (step S10
1), Only the special paper cut indicator 65 is controlled to be turned on.

On the other hand, the operator selects the mode selection button 63.
If the shredder mode is the special paper single cut mode when is pressed (step S106; Y),
The data indicating the mode written in the non-volatile memory area is changed to the plain paper / special paper cut mode (step S107). Then, the CPU 41 reads this mode (step S101) and lights both the plain paper cut indicator 64 and the special paper cut indicator 65.

Further, the operator selects the mode selection button 63.
If the mode of the shredder is the plain paper / special paper cutting mode at the time of pressing (step S106;
N), the data indicating the mode written in the nonvolatile memory area is changed to the plain paper single cut mode (step S107). Then, the CPU 41 reads this mode (step S101) and turns on only the plain paper cut indicator 64 (step S10).
2). In this way, each time the operator presses the mode selection button 63, the mode is changed in order. Since the current mode is written in the nonvolatile memory area of the RAM 44 each time, even if the power of the shredder is turned off, the original mode is displayed in the initial state when the power is next turned on. Depending on the device, it is also possible to initially set a mode as a predetermined default value and press the mode selection button 63 to change the mode if necessary.

FIG. 5 shows the flow of control of shredder cutting. When the operator presses the start button 61 shown in FIG. 3 (step S201; Y), the CPU 4
1 controls a carry motor control circuit 48 to carry a carry motor 49.
Is rotated (step S202). As a result, both the feed roll 15 and the transport rolls 16 and 17 rotate, and one sheet 12 of the sheet 12 placed on the cutting tray 11 is fed by the feed roll 15 and the transport roll 1
6 and 17 convey the inside of the apparatus main body. This conveyance is performed until the micro switch 21 detects the leading edge of the paper 12 (step S203).

When the micro switch 21 detects the leading edge of the paper 12 (Y), the CPU 41 controls the sensor input / output control circuit 57 to measure the transmittance of the paper 12 by the transmittance sensors 18 and 19 (step S204). . The transmittance measured at this time is compared with the current reference value adjusted by the adjustment value stored in the non-volatile memory area of the RAM 44 to the reference value as the default value stored in the ROM 43 (step S205). As a result, when the transmissivity is larger than the reference value, the paper 12 is determined to be special paper. In the case of special paper, the CPU 41 controls the second solenoid drive circuit 53 to control the storage switching plate solenoid 5
4 is excited (step S206), and the storage switching plate 25 is rotated to the position shown by the dotted line in FIG. In this state, the paper cut by the cutting rolls 23 and 24 is stored in the special paper storage unit 29.

In this state, the CPU 41 confirms the current mode by the non-volatile memory area and determines whether or not the special paper needs to be cut (step S207). If cutting is necessary, a control signal is sent to the cutting motor control circuit 51, and driving of the cutting motor 52 is started (step S208). After that, the carry motor control circuit 48 and the clutch control circuit 55 are controlled to rotate the pair of carry rolls 16 and 17 for a predetermined time (step S2).
09). This is because only the sheet 12 of which the type is currently detected is fed between the cutting rolls 23 and 24 while the next sheet 12 placed on the cutting tray 11 is not fed. In this state in which the cutting motor 52 is rotated in step S208, the special paper is cut by this, and the cut paper is stored in the special paper storage unit 29.

On the other hand, when it is determined in step S207 that cutting of the special paper is not necessary (N), the cutting motor 52 is not rotated, and instead the first solenoid drive circuit 46 is controlled to cut the cutting roller. Excitation of the solenoid 47 is started (step S210). Then, in this state, the pair of transport rolls 16 and 17 is rotated for a predetermined time (step S211). This is a state in which the next paper 12 placed on the cutting tray 11 is not fed, and only the paper 12 whose type is currently detected is not cut and the special paper storage unit 2
This is for storing in 9. When the special paper is completely stored in the special paper storage unit 29 after a predetermined time has elapsed, the cutting roller solenoid 47 is demagnetized (step S21).
2). Then, the process proceeds to the determination of whether or not the next sheet is present (step S213).

On the other hand, if it is determined in step S207 that cutting of the special paper is necessary (Y), the conveying rollers 16 and 17 are rotated for a predetermined time in step S209, and then the cutting motor control circuit 51 is controlled. Then, the rotation of the cutting motor 52 is stopped (step S214). After this, step S
Proceed to 213. In step S213, it is controlled whether or not the next sheet exists.

FIG. 6 shows the flow of the control for determining the presence / absence of the next sheet. The CPU 41 causes both the feed roll 15 and the transport rolls 16 and 17 to rotate (step S301), and the micro switch 21 causes the next sheet 1
It is determined whether the tip of No. 2 is detected (step S302) or whether a time sufficient for this detection has elapsed (step S303). If this sufficient time elapses, the micro switch 21 will switch to the next sheet 1
When the leading edge of 2 is detected (step S302; Y), it is determined that the next sheet exists (steps S304 and S2).
13; Y). In this case, the process proceeds to step S204 of FIG. 5, and the same control as that for the sheet 12 is performed.

On the other hand, when the micro switch 21 cannot detect the leading edge of the paper 12 even after a sufficient time for the next paper 12 to reach the micro switch 21 (step S303; Y), it is determined that the next sheet does not exist (step S305). In this case (step S213; N), the series of paper cutting control shown in FIG. 5 ends (end).

FIG. 7 shows the control operation of the full sensor in this embodiment. When the transmittance measurement is started (step S401; Y), the CPU 41 drives the full sensors 31, 32 in synchronization with this (step S401).
402). As a result, light rays are transmitted and received through the path indicated by the two-dot chain line in FIG. 1, and if there is no obstacle such as paper cut during this time, it is determined that there is still room (not full) before the storage box 26 is full. (Step S403; N). In this case, the full indicator 66 is not turned on.
On the other hand, when the light ray is completely blocked and it is determined that the storage is full (step S403; Y), the CPU 41 turns on the full indicator 66.

This lighting information can be written in the non-volatile memory area of the RAM 44, so that the full indicator 6 is turned on while the power of the shredder is turned on.
6 can be turned on. Also, depending on the device, it is possible to prevent the cutting from starting even if the start button 61 is pressed.

FIG. 8 shows a flow of work for setting the adjustment value with respect to the reference value of the transmittance. The CPU 41 determines whether or not it is in the adjustment value setting mode when the power of the shredder is turned on (step S501).
Specifically, when the power is turned on with the mode selection button 63 pressed, the adjustment value setting mode is set (Y). To indicate that this mode has been entered, the CPU
Reference numeral 41 controls the input / output circuit 45 to control the full indicator 66.
Blinks for 5 seconds (step S502). After that, when the adjustment operator newly presses the mode selection button 63 (step S503; Y), the adjustment value stored in the nonvolatile memory area is incremented by "+1" each time (step S50).
4) The reference value becomes high. Plain paper cut indicator 64 so that you can see that the mode selection button 63 has been pressed
It is effective to turn on each time.

On the other hand, each time the adjustment operator presses the start button 61 after step S502 (step S505), the adjustment value stored in the non-volatile memory area is decremented by "-1" (step S506). The value becomes low. Thus, in this embodiment, the adjustment value with respect to the reference value can be adjusted in eight steps. It is effective to turn on the special paper cut indicator 65 each time so that the start button 61 is pressed in the adjustment value setting mode. Unlike the above, when the adjustment operator presses the emergency stop button 62 (step S50
7) Then, the adjustment value setting mode ends (END).

Modification

FIG. 9 shows the structure of the shredder in the first modification of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be appropriately omitted. In the shredder 70 of this modified example, a pair of conductive rolls 72, 73 is arranged between the pair of transport rolls 16, 17 and the paper guide 22. A voltage is applied to one of the conductive rolls 72 by a DC power source 74, and an ammeter 75 is arranged on the other conductive roll 72. The conductivity of the paper 12 passing between them is measured. It is supposed to be done. That is, in the shredder 70 of this modified example, the electrical conductivity of the paper 12 is measured to distinguish the plain paper from the special paper.

In the previous embodiment, the sheet-like paper made of metal among the special papers cannot be distinguished from plain paper because it does not transmit light rays, but the shredder 7 of the first modified example is used.
At 0, if the conductivity is extremely good or bad, it is discriminated as special paper, and if it is between these, it is discriminated as plain paper.
These sorts can be performed almost completely.

Further, in the shredder 70 of this modified example,
By using a high-sensitivity ammeter 75 for detecting a very small amount of current, the microswitch 21 shown in the embodiment is used.
This ammeter 75 can be used in place of the tip detection of the above, and similar detection can be performed. Shredder 7 of this modification
In 0, the pair of conductive rolls 72 and 73 are not driven by the drive system, and the sheet 12 is transported by the pair of transport rolls 1.
6 and 17 are performed.

However, a pair of these conductive rolls 72, 7
It is also possible to drive 3 by a conveyance motor 49 as shown in FIG. In this case, the pair of transport rolls 16 and 17 can be omitted, and the configuration of the shredder 70 can be further simplified.

Although the shredders 10 and 70 of the embodiment or the first modified example have been described above, many more modifications can be made to the shredder of the present invention. I will list these in order.

First, in the embodiment and the first modification, the cutting rolls 23 and 24 are applied to the paper 12 which is not cut.
It is decided to widen the space between and to allow the space to pass through the space and store in the storage box 26. In addition to this, when a sheet 12 that is not cut is detected, its conveyance may be stopped and a buzzer (not shown) may be activated. In this case, the operator may open the upper part of the main body of the apparatus and take out the corresponding sheet 12 which is being conveyed and is present inside. Of course, in addition to this, when the sheet 12 which is not cut is detected, this path may be switched to a path other than the cutting rolls 23 and 24.

Further, in the embodiment, the light ray is used, and in the modified example, the electrical conductivity is measured to determine the characteristic of the sheet. However, both of them can be used to more reliably determine the characteristic of the sheet. You may Of course, the transmissive detector may be a recursive transmissive detector, and it is also possible to sort the paper by using other measuring means.

Further, in the embodiments and the like, the plain paper and the special paper are sorted and stored in separate storage portions. However, when only one of the sheets is cut, they are mixed in the same storage portion. It may be stored. Further, the sorting of paper need not be limited to plain paper and other special paper. For example, when the paper used in the office or the like is limited to plain paper and OHP paper, OHP paper may be detected and positively selected.

FIG. 10 is for explaining another sorting method when the sheets are sorted and stored in the storage box. In the shredder 80 of the second modified example, the cutting roll 2
The upper guide plate 81 and the lower guide plates 82 and 8
3 are arranged. A predetermined space 85 is provided between the two lower guide plates 82 and 83, and a movable baffle 85 is arranged therein. When the movable baffle 86 is in a rotational position where the tip of the lower guide plate 83 and the upper guide plate 82 are connected as shown by the solid line in the figure, the cut sheet falls downward from the space 85, and Is stored in the storage box 87 on the right side.

On the other hand, when the movable baffle 86 is in the rotation position where the two lower guide plates 82 and 83 are connected as shown by the dotted line in the figure, the cut sheet is guided by the lower guide plate 83 and is drawn. Is stored in the storage box 88 on the left side. In the shredder 80 of the second modified example, the full sensors 91 to 9 are provided.
3 are arranged so as to correspond to the respective storage boxes 87 and 88, so that the full states of these can be detected individually,
It can be individually displayed on an operation panel (not shown).

[0050]

As described above, according to the first aspect of the invention, the sheets are sorted into two types, and only one of them is cut and the other is not cut until it is stored in the storage box. Therefore, it is not necessary to divide the storage box into two, and the structure of the device is simplified. Further, since it is possible to take out the sheet for which cutting is not required from the storage box in a state where it is not cut, there is an advantage that it is possible to perform shredding without having to sort for the necessity of cutting.

According to the inventions of claims 2 to 4,
Paper is sorted into two types according to its characteristics, and it is decided to cut each of these and store them in different storage means. Compared with the conventional method in which the cut sheets could not be sorted and incinerated. Effective use of resources can be promoted.

In particular, according to the third aspect of the invention, since the sheets are selected by the transmittance, the OHP sheet can be easily distinguished from other sheets. Further, according to the invention described in claim 4, since the paper is sorted by the electric conductivity, there is an advantage that the colored vinyl sheet and the metal sheet can be effectively sorted from the ordinary plant fiber paper.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a shredder according to an embodiment of the present invention.

FIG. 2 is a block diagram showing an outline of a circuit configuration of a shredder of the present embodiment.

FIG. 3 is a plan view of an operation panel of the shredder of this embodiment.

FIG. 4 is a flowchart showing a flow of a mode change operation of the shredder of the present embodiment.

FIG. 5 is a flow chart showing a control flow of shredder cutting according to the present embodiment.

FIG. 6 is a flowchart showing a flow of control for determining the presence / absence of a sheet to be sent next in the present embodiment.

FIG. 7 is a flowchart showing the control operation of the full sensor in this embodiment.

FIG. 8 is a flow chart showing the flow of work for setting an adjustment value with respect to a reference value of transmittance in the present embodiment.

FIG. 9 is a schematic configuration diagram showing a configuration of a shredder in a first modified example of the present invention.

FIG. 10 is a schematic configuration diagram showing a main part of a shredder according to a second modified example of the present invention.

[Explanation of symbols]

10, 70 ... Shredder, 12 ... Paper, 14 ... Operation panel, 15 ... Feed roll, 16, 17 ... Conveying roll,
18, 19 ... Transmittance sensor, 21 ... Micro switch,
23, 24 ... Cutting roll, 25 ... Storage switching plate, 26 ... Storage box, 28 ... Plain paper storage section, 29 ... Special paper storage section, 41
... CPU, 43 ... ROM, 44 ... RAM, 63 ... Mode selection button, 72, 73 ... Conductive roll, 74 ... DC power supply, 75 ... Ammeter

Claims (4)

[Claims] 1. A sheet detecting unit for detecting a sheet, a characteristic detecting unit for detecting a characteristic of the sheet detected by the sheet detecting unit, and a comparing unit for comparing the detected characteristic of the sheet with a predetermined reference value. Paper selection means for selecting the paper into one of two types according to the comparison result, cutting means for cutting the selected paper when it is one of the predetermined types, and paper after cutting or cutting And a storage means for storing the paper that has not been processed. 2. A sheet detecting unit for detecting a sheet, a characteristic detecting unit for detecting a characteristic of the sheet detected by the sheet detecting unit, and a comparing unit for comparing the detected characteristic of the sheet with a predetermined reference value. Paper selection means for selecting paper into one of two types according to the comparison result, cutting means for cutting the selected paper, and storage for storing the cut paper according to the type selected by the paper selection means A shredder comprising means. 3. A sheet detecting unit for detecting a sheet, a transmittance detecting unit for detecting a sheet transmittance detected by the sheet detecting unit, and a comparing unit for comparing the detected sheet transmittance with a predetermined reference value. A sheet sorting means for sorting the sheet into one of two types according to the result of the comparison, a cutting means for cutting the sorted sheet, and a sheet after cutting according to the type sorted by the sheet sorting means. A shredder characterized by comprising a storing means for storing. 4. A paper detecting means for detecting a paper, a conductivity detecting means for detecting the conductivity of the paper detected by the paper detecting means, and comparing the detected conductivity of the paper with two predetermined reference values. Comparing means, paper sorting means for sorting the paper into normal paper using plant fibers and other paper according to the comparison result, cutting means for cutting the sorted paper, and the paper sorting means A shredder comprising: storage means for storing cut sheets according to the sorted types.