JPS59150554A - Paper shredding apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a paper shredding device used for shredding unnecessary documents.

Recently, with the diversification of information, a large amount of documents are being created. Some of these documents serve their purpose and become unnecessary. However, even though the documents are unnecessary, there are some that cannot be easily disposed of due to confidentiality reasons. For this reason, paper shredding devices that can shred unnecessary documents to the extent that they cannot be restored are widely used.

[Prior Art] FIGS. 1 and 2 show an example of such a conventional paper shredding device. In this device, the device main body 1
A guide surface 2 is provided at an appropriate inclination on the upper surface.

Guide walls 3 are provided on both sides of the guide surface 2. At the back of the guide surface 2, two upper and lower cutter rows 5.6 are provided in mesh with each other. The cutter row 5.6 has a structure in which a plurality of disc-shaped cutters 7.8 and spacers 9.10 are arranged alternately on a shaft 11.12.

Further, the cutter rows 5.6 are configured to receive the driving force of a motor (not shown) via a belt (not shown) or the like, so that they rotate in opposite directions as indicated by arrows in FIG. A cover 13 is provided above the cutter row 5.6. The cover 13 is attached to the apparatus main body 1 via a hinge 14 so as to be openable and closable, and is normally held in a closed state by screws (not shown) or the like. Cutter row 5.
A receptacle 15 is provided outside the wood storage body 1 at the latter stage of the receptacle 15 .

When shredding unnecessary documents 16 with this device, first the start button 17 is pressed to drive the motor and rotate the cutter rows 5, 6 in the directions of the arrows in FIG. 2, respectively. In this state, the unnecessary document 16 is fed along the guide surface 2 and entered between the cutter rows 5.6. This unnecessary document 16 that has entered is cut off by the cutter row 5.6 and then received by the cutter row 5.6.
[Ejected at 115.

By the way, such a device is generally installed in the A office and used easily, so it is small and has low power consumption. Therefore, in such a device, its shredding capacity, ie, the amount of unnecessary documents 16 that can be shredded at one time, is relatively small.

However, due to ignorance or carelessness of the A-pererator, the operator may try to shred more unnecessary documents 16 than his or her shredding capacity at one time. In such a case, if the unnecessary document 16 bites into the cutter row 5.6, a slip occurs in the transmission system such as a belt, and the cutter row 5.6 stops. If the number of unnecessary documents 16 is slightly larger than the shredding capacity, press the reverse button 18.
By pressing , reverse the cutter row 5.6 and return the unnecessary document 16, or press the stop F button 19 to stop the motor and pull back the unnecessary document 16, the cutter row 5.6 will cut into the gap between the cutter rows 5.6. The unnecessary documents 16 can be taken out. However, if the amount of unnecessary documents 16 is more than the 1III cutting capacity to a certain extent, the digging force of the unnecessary documents 16 is so large that it is not possible to remove the unnecessary documents 16 simply by reversing or stopping the motor. Sometimes. In such a case, the current practice is to open the cover 13 and take out the unnecessary documents 16 by tearing them one by one, which has the drawback of being extremely troublesome and time-consuming. Further, even with this method, the device had to be disassembled to the platform from which the unnecessary items 16 could not be taken out.

[Object of the Invention] The present invention was made in view of the above circumstances.
It is an object of the present invention to provide a paper shredding device that can prevent paper from clogging a cutter row.

[1] Means for Achieving the Target 1 The present invention includes a detection means for detecting whether the amount of paper fed along the guide surface is equal to or greater than a predetermined value, and a detection means for detecting whether the amount of paper fed along the guide surface is equal to or greater than a predetermined value. A control means is provided for controlling the paper to prevent the paper from entering between the pair of cutter rows based on a detection signal from the detection means when the paper is cut, thereby achieving the above-mentioned [Object 1].

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

(Embodiment) FIG. 3, in which the same parts as in FIG. 2 are given the same reference numerals, shows the main parts of a paper shredding device in an embodiment of the present invention.

In this device, a guide surface 2 is provided at the tip of the cover 13.
A microswitch 21 is provided at a location facing the. The microswitch 21 has 4- unnecessary documents 1 between its actuator 22 and the guide surface 2.
6 is fed above a predetermined value, that is, above the shredding capacity,
It is set to switch and turn on. When the microswitch 21 is turned on, a control section (not shown) causes a motor (not shown) to rotate in reverse or to stop.

When a start button (not shown) of this device is pressed, the motor rotates in the normal direction, and the cutter rows 5, 6 each begin to rotate in the direction of the arrow. When the unnecessary document 16 is fed along the guide surface 2 in this state, it enters below the actuator 22 of the microswitch 21.

If the amount of unnecessary documents 16 is less than the shredding capacity, the microswitch 21 is not switched and is kept in the off state. Therefore, in this case, the cutter rows 5.6 continue to rotate in the normal direction, and the unnecessary documents 16 are fed between them and shredded.

On the other hand, if the amount of unnecessary documents 16 exceeds the shredding capacity, the microswitch 21 is switched to the on state. Then, under the action of the control section, the motor reverses or stops, and the cutter 115.6 reverses or stops.

When the cutter rows 5.6 are reversed or stopped, no unnecessary documents 16 are fed between them and therefore do not become jammed between the cutter rows 5.6. Therefore, in this case, all you need to do is to take out the unnecessary document 16, reduce the shredding capacity of the document 16 to below, and send it in again.

FIG. 4, in which the same parts as in FIG. 3 are denoted by the same reference numerals, shows the main parts of a paper shredding device according to another embodiment of the present invention.

In this device, a feed roller 23 and a pressure roller 2 are placed in the middle of the guide surface 2 before the microswitch 21.
4 has been installed. The feed roller 23 is rotated by the motor. Pressing roller 24
is disposed so as to be able to move toward and away from the feed roller 23, and is urged toward the feed 1''-ra 23 side by a spring or the like (not shown).

When a start button (not shown) of this device is pressed, the motor rotates normally, the cutter rows 5, 6 each begin to rotate normally in the direction of the arrow, and the feed roller 23 begins to rotate normally in the direction of the arrow. If the amount of unnecessary documents 16 being fed along the guide surface is less than the shredding capacity, the feed roller 2
3 and the pressure roller 24, and then sent between the cutter rows 5.6 and shredded.

On the other hand, if the amount of unnecessary documents 16 exceeds the shredding capacity, the microswitch 21 is switched on and the motor is reversed or stopped. When the motor reverses or stops, the cutter row 5.6 reverses or stops, and the feed roller 23 reverses or stops. For this purpose, the unnecessary document 16 is either returned by the feed roller 23 or stopped before the cutter row 5.6.

In this device, since the feed roller 23 and the pressing roller 24 are provided before the microswitch 21, the unnecessary document 16 passing between these rollers is crushed to some extent, and its thickness can be detected in this state. In other words, some of the unnecessary documents 16 are bulkier than their original thickness, so this is crushed to bring the thickness closer to the original thickness, and this is detected by the microswitch 21. .

Therefore, with this device, it is possible to detect whether or not the amount of unnecessary documents 16 exceeds the shredding capacity based on the actual thickness of the unnecessary documents 16 rather than the apparent thickness thereof.

Although the microswitch 21 is used in the above embodiment, the present invention is not limited to this. For example, a light source and a photo sensor may be provided above the guide surface 2, and the difference in the angle of reflection from the unnecessary document 16 reaching below these may be used. It may be detected whether the amount is greater than or equal to a predetermined value. Further, a light source and a photo sensor may be provided on both sides of the guide surface 2, respectively. Furthermore, it goes without saying that detection may be performed using a device that uses ultrasonic waves.

[Effects of the Invention] As described above, according to the present invention, it is possible to prevent unnecessary documents from clogging the cutter row when more unnecessary documents than the shredding capacity are fed. Therefore, the efficiency of shredding work is improved and the operating rate is also improved.

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[Brief explanation of drawings]

Fig. 1 is a perspective view showing an example of a conventional paper shredding device;
The drawings are a vertical side view taken along line I-II in FIG. 1, FIG. 3 is a vertical side view showing main parts of a paper shredding device according to an embodiment of the present invention, and FIG. 4 is a cross-sectional side view of the present invention. (It is a vertical cross-sectional side view showing the main parts of the paper shredding device in the embodiment of II!. 2...Guide surface, 5.6... Cutter row, 16...・Unnecessary documents, 21... Micro switch. Applicant: Fuji Xerox Co., Ltd. Patent attorney Umeo Yamauchi

Claims (1)

[Claims] A pair of cutter rows for shredding the paper fed along the guide surface, a detection means for detecting whether the hanging of the paper fed along the guide surface is equal to or greater than a predetermined value, and a detection means for detecting whether the amount of paper fed along the guide surface is equal to or greater than a predetermined value. A paper shredding device characterized by comprising: control means for controlling the paper to stop entering between the pair of cutter rows based on a detection signal from the detection means when the above is the case.