JPH06277548A - Paper feed device of shredder - Google Patents

Abstract

PURPOSE:To positively restrain transport of paper with a thickness being over a standard into a shredding part on this side of it, to prevent lock of the shredding part previously and surely and to continue stable operation of the device by returning the paper with a thickness being over a standard positively. CONSTITUTION:The device is provided with a paper feeding means 17 transporting paper 10 from a paper inserting part 16, a forward feed roller 18 holding the paper transported with paper feeding means there between the rollers and transporting it to the shredding part and a reversal rotatable reversible roller 19, a detection means 20 for paper thickness detecting thickness of the paper transported from between the rollers to the shredding part, and a roller control means by which the reversible roller 19 is rotated forward at the time of being <= a prescribed value at the thickness of paper detected with the paper thickness detection means and it is rotated backward at the time of being the prescribed value or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a shredder,
The present invention relates to a paper feeding device that feeds paper from a paper insertion portion to shredded portions.

[0002]

2. Description of the Related Art In a shredder, if the thickness of the paper conveyed to the shredded portion exceeds the standard, the shredded portion will be locked, so it is necessary to prevent this. Conventionally, the preventive means described in the following publications is known.

Japanese Utility Model Laid-Open No. 57-70445 gazette A paper thickness detecting portion for detecting the thickness of the paper is provided in the paper inserting portion, and when the thickness of the paper is a predetermined value or more, a warning device is operated to warn or Stop the transportation motor.

Japanese Patent Publication No. 60-34900 The micro switch indicates that the paper feed belt conveyor is overloaded or paper is not fed when a paper exceeding the shredding capacity is forcibly inserted. Then, the drive motor of the shredder body is stopped or reversed.

[0005]

However, these prior arts are, rather than preventing the occurrence of defects in advance,
It is intended to suppress the occurrence of problems that occur, and to carry in paper with a thickness exceeding the standard into shredded parts.
It is not sufficient to prevent the lock of the shredded portion by positively suppressing it before that.

Therefore, the object of the present invention is not only to positively and positively prevent the lock of the shredded portion by positively suppressing the carry-in of the paper having the thickness exceeding the standard into the shredded portion in front of it. Instead, the paper with a thickness exceeding the standard is to be positively fed back so that the stable operation of the apparatus can be continued.

[0007]

A paper feed device for a shredder according to the present invention comprises a paper feed means for feeding paper from a paper insertion portion, and a shredder portion for sandwiching the paper fed by the paper feed means. A forward transfer roller and a reversible roller capable of reversing forward and backward, paper thickness detecting means for detecting the thickness of the paper conveyed between the rollers to the shredder portion, and the paper thickness detecting means. When the detected paper thickness is less than a predetermined value, the reversible roller is rotated in the normal direction, and when the detected paper thickness is more than the predetermined value, the reversible roller is rotated in the reverse direction.

The paper thickness detecting means is displaced in accordance with the thickness of the paper, for example, between the reversible roller and the shredder to detect the thickness. Alternatively, the paper thickness is detected by the displacement of either the forward transfer roller or the reversible roller.

[0009]

When the thickness of the paper inserted into the paper insertion portion is less than the predetermined value, both the forward transfer roller and the reversible roller are normally rotated and the paper is conveyed to the shred portion. However, when the thickness of the inserted paper is a predetermined value or more, the reversible roller is reversed by the roller control means based on the thickness detection by the paper thickness detection means, and the paper is automatically returned to the paper insertion portion.

[0010]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 8 shows a schematic configuration of the shredder. Paper 10
When the paper is inserted into the shredder body 12 from the paper insertion opening 11, the paper presence sensor 13 inside the paper insertion opening 11 detects the paper, and the drive motor (not shown) drives the shredder cutter 14 Is rotated. This drive motor is connected to, for example, a motor load monitoring device that monitors the motor load based on the magnitude of the motor current, and if the inserted paper is within the shredding capability possible range, the cutter 14 is rotated. It has a self-protection function that automatically stops or reverses when it exceeds the limit. The shredded paper is a cutter 14
Is collected in the storage container 15 below.

FIG. 1 and FIG. 2 show a first embodiment of the paper feeding device of the present invention applied to such a shredder. From the paper stacking base 16 to the shredder in the shredder body, the paper presence sensor 13, the paper feed roller 17, the forward transfer roller 18 and the reversible roller 19, which are a pair of paper separating rollers, the paper thickness sensor 20, the relay guide. Roller pairs 21 are sequentially arranged.

The paper presence / absence sensor 13 includes a sensing lever 22 rotated by the paper, a light-shielding plate 23 coaxial with the sensing lever 22, and a photocoupler 24 shielded by the light-shielding plate 23.
It consists of and.

The paper feed roller 17 and the forward transfer roller 18 are axially supported on the same rocking bearing stand 25, and a belt 40 is stretched between the roller shafts of the rollers. The belt 41 is also stretched between the roller shaft of the forward transfer roller 18 and one roller shaft of the relay guide roller pair 21. Then, the roller shaft of the forward transfer roller 18 is rotated by the paper feed motor 26 to rotate the forward transfer roller 18, and the paper feed roller 17 and the relay guide roller pair 21 are also rotated. To rotate. On the other hand, the reversible roller 19 is rotated by a reversible motor 27 capable of reversing forward and backward, separately from the rollers 17, 18 and 21.

The rocking bearing base 25 has a protrusion 25a which engages with a push-up lever 29 which is turned clockwise or counterclockwise according to the on / off state of the sheet feeding on / off switching electromagnet 28. . Then, the rocking bearing base 25 is provided with the push-up lever 2
The electromagnet 28 is switched on and off between an upper retracted position in which the paper feed roller 17 is pushed up by 9 and does not feed, and a lower paper feed operating position in which the paper feed roller 17 feeds. Has become. FIG. 1 shows the state in the retracted position.

The paper thickness sensor 20 is a forward transfer roller 18
A sensing lever 30 that is pushed up by an amount according to the thickness of the paper 10 that passes between the reversible roller 19 and the reversible roller 19, a light shielding plate 31 that rotates integrally with the sensing lever 30, and a photocoupler 32 that is shielded by the light shielding plate 31. It is composed of. In the paper thickness sensor 20, when the thickness of the paper 10 is less than the predetermined value, the photocoupler 32 is turned off due to the light shielding by the light shielding plate 31, but when the thickness of the paper 10 is equal to or more than the predetermined value, the light shielding plate is provided. 31 is deviated from the optical path of the photocoupler 32, and the photocoupler 32 is turned on.

FIG. 3 is a block diagram showing the electrical construction of this embodiment. The paper feed motor 26,
The reversible motor 27 and the electromagnet 28 start the paper feed operation with the start switch 33 and the paper presence sensor 13 described above.
Also, it is controlled by the controller 34 according to the signal from the paper thickness sensor 20.

FIG. 4 shows the flow of the control operation. First, it is determined in step S1 whether or not the paper 10 is loaded on the paper loading platform 16 based on a signal from the paper presence sensor 13, and if it is determined that there is no paper, this is repeated until the paper is loaded. If it is determined that there is paper, the process proceeds to step S2 to determine whether the start switch 33 is on, and if not, the determination of steps S1 and S2 is repeated.

When the start switch 33 is turned on,
In step S3, the presence / absence of the paper is determined based on the signal from the paper presence / absence sensor 13. If the paper is present, the process proceeds to step S4 to turn on the electromagnet 28. When this is turned on, the push-up lever 29 is rotated in the counterclockwise direction, the swing bearing base 25 is lowered as shown in FIG.
Touch 0.

Next, in step S5, it is determined whether the paper thickness sensor 20 is off. The paper thickness sensor 20 is adjusted so that the paper thickness sensor 20 is turned on when the thickness of the paper 10 is equal to or more than a predetermined value set in advance, and is turned off when the thickness is less than that value.

The paper thickness sensor 20 is off, that is, the paper 1
When the thickness of 0 is less than the predetermined value, the routine proceeds to step S6, where the paper feed motor 26 is turned on to rotate normally and the reversible motor 27 also rotates normally. Both of these motors 26
When the paper 27 is rotated in the normal direction, the paper 10 fed by the paper feed roller 17 is transferred to the normal transfer roller 18 as shown in FIG.
And the reversible roller 19 conveys it to the front,
It is sent to the paper shredder portion via the relay guide roller pair 21.

On the other hand, when the paper thickness sensor 20 is turned on, that is, when the thickness of the paper 10 is not less than the predetermined value, the process proceeds to step S7.
At the same time that the paper feed motor 26 is turned on to rotate in the normal direction, the reversible motor 27 rotates in the reverse direction. When the reversible motor 27 rotates in the reverse direction, the reversible roller 19 rotates in the reverse direction as shown in FIG. 6, so that the paper 10 is returned to the paper stacking base 16. Such reverse feeding is continued until the paper thickness sensor 20 is turned off, that is, until the thickness of the paper 10 becomes less than a predetermined value or the paper 10 is released from the sensing lever 30 of the paper thickness sensor 20.

In steps S6 and S7, the motor 26
-After 27 is operated, it returns to step S3 and repeats the same processing. If it is determined in step S3 that there is no paper, the process proceeds to step S8 to determine whether a certain time has elapsed, and after that time, the process proceeds to step S9 to turn off the electromagnet 28 and both motors 26 and 27 to perform processing. To finish.

FIG. 7 shows a modification of the present invention. In this example, the shaft 18a of the forward transfer roller 18 is made strong so as not to bend, while the shaft 19a of the reversible roller 19 is made flexible so that the reversible roller 19 can be vertically displaced. Then, the sensing lever 30 senses that the reversible roller 19 is lowered according to the thickness of the paper 10 pressed by the forward transfer roller 18,
When the thickness of the paper 10 is less than a predetermined value, the photocoupler 32 is turned off due to the light shielding by the light shielding plate 31. Thus, the photocoupler 32 is turned on.

[0024]

According to the present invention, when the thickness of the paper inserted into the paper insertion portion is less than the predetermined value, both the forward transfer roller and the reversible roller are normally rotated to move the paper to the shred portion. Although the paper is conveyed, if the thickness of the paper is more than the specified value, the reversible roller is automatically reversed in the reverse direction based on the thickness detection by the paper thickness detection means and the paper is returned to the paper insertion part. Not only can you prevent the paper from being carried into the shredded part in front of it, but you can prevent the shredded part from being locked in advance, and positively feed paper that exceeds the standard. It can be returned to continue stable operation of the device.

[Brief description of drawings]

FIG. 1 is a side view showing a schematic configuration of an example of a sheet feeding device according to the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a block diagram of an electrical configuration of the paper feeding device.

FIG. 4 is an operation flowchart of the paper feeding device.

FIG. 5 is a side view of the sheet feeding device in a sheet feeding state.

FIG. 6 is a side view of a paper returning state in which the reversible roller is reversed in the paper feeding device.

FIG. 7 is a side view showing a modified example of the present invention.

FIG. 8 is a schematic configuration diagram of a shredder.

[Explanation of symbols]

 10 Paper 16 Paper Stacking Table (Paper Inserting Section) 17 Paper Feed Roller (Paper Feeding Unit) 18 Forward Transfer Roller 19 Reversible Roller 20 Paper Thickness Sensor (Paper Thickness Detection Means) 26 Paper Feed Motor 27 Reversible Motor 34 Controller (Roller control means)

Claims (3)

[Claims] 1. A paper feed unit for feeding a paper from a paper insertion unit, a forward transfer roller for feeding the paper fed by the paper feed unit to a shredding unit, and a reversible reversible reversible unit. Rollers, paper thickness detecting means for detecting the thickness of the paper conveyed between the rollers to the shredder portion, and when the paper thickness detected by the paper thickness detecting means is less than a predetermined value, A shredder sheet feeding device comprising: a roller control unit that normally rotates the reversible roller and reversely rotates the roller when the value is equal to or more than a predetermined value. 2. The paper thickness detecting means is displaced according to the thickness of the paper in the middle of the reversible roller and the shredder to detect the thickness.
Paper feeder for shredder. 3. The shredder according to claim 1, wherein the paper thickness detecting means detects the paper thickness by displacement of one of the forward transfer roller and the reversible roller. Paper feeder.