JPH0787902B2 - Paper jam control device for document shredder - Google Patents

Description

TECHNICAL FIELD The present invention relates to a paper jam control device for a document shredder.

<Prior Art> The shredding capacity of a document shredder is usually determined by a shredding motor. Even if the shredder has the shredding ability, the shredding motor stops and the shredding device 1 stops, resulting in a paper jam condition.

In order to easily remove jammed paper, the conventional document shredder detects the stop of the shredding motor by overload detection means, and stops the supply of power to the shredding motor by the detection signal. Or, it was controlling to reverse the shredding motor.

<Problems to be Solved by the Invention> However, in the conventional technology, once a paper jam occurs, the jammed paper is always removed in any state, and after reducing the number of papers, the document shredder is used. It was necessary to restart the paper and re-insert the reduced paper, which had a drawback that the shredding efficiency was significantly reduced.

In view of the above, it is an object of the present invention to provide a paper jam control device for a document shredder that can forcibly discharge the jammed paper and improve the shredding efficiency even if the paper jam occurs. To do.

<Means for Solving the Problem> The problem solving means according to the present invention drives the shredding device 1 for shredding shredded paper and the shredding device 1 as shown in FIGS. 1 to 7. In a document shredding machine having a shredding motor 2 and an overload detecting means 3 for detecting an overload of the shredding motor 2, a capacity switching means 4 for switching a current i of the shredding motor 2 to a large value, and The capacity switching means 4 is operated by an overload detection signal from the overload detection means 3 and a control means 5 for supplying a power source E to the shredding motor 2 for a fixed time t is provided. When the means 4 is activated and the current i of the shredding motor 2 is increased, the shredding motor 2 is set to a time that is not longer than the time that the shredding motor 2 is burned out, and is longer than the time that the jammed shredded paper can be discharged. is there.

<Operation> In the above means for solving the problem, when the number of shredded sheets that exceeds the permissible load torque of the shredded motor 2 is input to the shredded device 1, the shredded motor 2 is stopped and a paper jam occurs. To do. Then, the overload detection means 3 detects it, the control means 5 operates by the overload detection signal, the capacity switching means 4 operates to increase the current of the shredding motor 2, and the shredding motor 2 Increase allowable load torque. Therefore, the shredder 1 is forcibly driven to automatically eject the jammed paper.

On the other hand, when the predetermined time t has elapsed, the control means 5 cuts off the supply of the power source E to the shredding motor 2, so that the shredding motor 2 is not burned.

Therefore, even if a paper jam occurs, it is not necessary to remove the jammed paper, reduce the paper, and restart, so that the shredding efficiency is improved and the shredding motor 2 associated with the forced ejection is used. Can also be prevented from burning.

<Examples> Examples of the present invention will be described below with reference to the drawings.

1 to 6 illustrate a first embodiment of a paper jam control device for a document shredder according to the present invention.
FIG. 2 is an electric circuit diagram, FIG. 2 is a block diagram of control means, and FIG.
FIG. 4 is a perspective view of the inside of the document shredder, FIG. 4 is a shredded sectional view of the document shredder, FIG. 5 is a time chart of control means, and FIG.
The figure is a time chart during the auxiliary operation of the control means.

As shown in the drawings, a paper jam control device for a document shredding machine according to the present invention includes a shredding device 1 for shredding shredded paper, and the shredding device 1.
In a document shredding machine having a shredding motor 2 for driving a shredding motor and an overload detecting means 3 for detecting an overload of the shredding motor 2, a capacity switching means 4 for largely switching a current i of the shredding motor 2 And a control means 5 for operating the capacity switching means 4 in response to an overload detection signal from the overload detection means 3 and supplying a power source E to the shredding motor 2 for a fixed time t.

As shown in FIGS. 3 and 4, the shredding device 1 is provided with a pair of roller-type cutting blades 6 and 7 for shredding shredded paper in the longitudinal direction, and shredded by the pair of cutting blades 6 and 7. It is configured in a cross-cut system with a spiral blade 8 for laterally shredding shredded paper, and opposes a support plate 10 in the shredder main body 9 and an input port 11 formed on the support plate 10. Has been incorporated.

The cutting blades 6 and 7 have gears 12 and 13 that mesh with each other at one end. Further, the shredding blade 7 includes the gear 14 to the gear 15 and the shaft at the other end.
It is interlockingly connected to the gear 18 through the gear 16 and the gear 17.

The spiral blade 8 has a gear 19 at one end, and the gear 19
Is geared to gear 20. The gears 18, 20 are integrally rotatably provided on a shaft 21, and a swing frame 22 is pivotally supported by the shaft 21 so as to be vertically swingable. Swing frame 22 is gear 18
Gear 23 that meshes with, gear 24 for forward rotation that rotates integrally with this, and gear 25 for reverse rotation that meshes with gear 24 for normal rotation
Further, the forward rotation gear 24 is constantly urged upward by the spring 27 so as to mesh with the drive gear 26.

The swing frame 22 is provided with a reversing lever 28 projecting to the upper surface side of the shredder body 9, and when the reversing lever 28 is pushed downward, the swing frame 22 swings downward against the spring 27. , Reverse gear
25 is configured to mesh with the driving gear 26.

The drive gear 26 is provided integrally with the worm gear 29,
The worm gear 29 is in mesh with a worm 31 formed on the output shaft 30 of the shredding motor 2.

Therefore, the shredding device 1 is always driven in the forward rotation direction by the shredding motor 2 and can be rotated in the reverse direction only when the reverse rotation lever 28 is pressed.

A reversing switch 32 is provided on the support plate 10 so as to detect when the swing frame 22 swings downward. On the upper surface of the shredder body 9, shred switch 33, stop switch 34
And a scrap box 35 for storing shredded scraps of shredded paper shredded by the shredder 1.

The shredding motor 2 is a general stripping motor, and the winding 36 thereof is provided with an intermediate tap 37 so that the internal impedance can be changed as shown in FIG.

The overload detection means 3 is composed of a current transformer 38 that detects a current i flowing through the shredding motor 2 and an amplifier section 39 that amplifies the detection signal, and detects the current i flowing through the shredding motor 2 and an amplifier section. Amplified by 39 and converted to output voltage,
The load state of the shredder motor 2 is output to the control means 5.

The capacity switching means 4 is a two-contact type relay 42 having a normally-open contact 40 and a normally-closed contact 41. The normally-closed contact 41 is wound on the winding 36 of the shredding motor 2, and the normally-open contact 40 is wound. The common terminals 43 are connected to the power supply E at the intermediate taps 37 of the line 36, respectively.

The control means 5 is a shredding switch signal from the shredding switch 33.
a, the shredding relay signal c and the capacity switching signal e are output by the stop switch signal b from the stop switch 34 and the overload detection signal d from the overload detecting means 3 to control the shredding relay 44 and the capacity switching means 4. As shown in FIG. 2, it comprises a timer 45, flip-flops 46 and 47, an AND element 48 and the like. Shred relay 44 has normally open contacts 49.

In FIG. 1, 50 is a thermal protector.

In the above configuration, when the shred switch 33 is pressed, the shred switch signal a is input to the flip-flop 47 of the control means 5 as shown in FIG. 5, so that the flip-flop 47 outputs the shred relay signal c. And the normally open contact 49 of the shred relay 44
Is turned on, the voltage of the power source E is applied to the winding 36 of the shredder motor 2, and the shredder motor 2 rotates. Therefore, the rotation of the shredding motor 2 is transmitted to the shredding device 1 via the gear train, and the cutting blades 6 and 7 and the spiral blade 8 of the shredding device 1 rotate in the forward direction. In this state, when shredded paper is loaded from the input port 11, the shredded paper is shredded by the shredder 1 and the shredded waste is discharged to the waste box 22.

The load state of the shredder motor 2 at this time is detected by the overload detection means 3, and the signal is constantly given to the control means 5. When a load exceeding the allowable load torque of the shredding motor 2 is applied, the shredding motor 2 and the shredding device 1 are stopped, and a paper jam occurs. Therefore, the load detection signal d from the overload detection means 3 As shown in FIG. 5, the overload detection level V is reached, and the capacity switching means 4 is operated for a fixed time t set by the timer 45 inside the control means 5. That is, since the control means 5 outputs the capacity switching signal e, the relay 42 switches from the normally closed contact 41 to the normally open contact 40, and the coil portion of the winding 36 of the shredding motor 2 is reduced, so that the shredding motor 2 Lower the impedance and increase the current i. When the current i increases in this way, the permissible load torque of the shredding motor 2 increases, and the shredded device 1 forcibly scrapes the jammed shredded paper.
Discharge to 35.

Then, when the fixed time t set by the timer 45 of the control means 5 has passed, the capacity switching means 4 returns and returns to the normal shredding state.

By the above operation, even if the allowable load torque of the shredding motor 2 is exceeded and a paper jam occurs during shredding of shredded paper, it is not necessary to take out the jammed paper from the input port 11 again, and the shredding switch is turned on again. Since it is not necessary to press 33, the shredding efficiency is improved.

However, the set time t of the tire 15 inside the control means 5 when the capacity switching means 4 is operated by the overload detection means 3 is in a state where the capacity switching means 4 is operated and the current i of the shredding motor 2 is increased. It is necessary to set the time so that the shredding motor 2 does not burn out and the time at which the jammed shredded paper can be discharged or more, and the current i flowing to the shredding motor 2 at that time also needs to take the above into consideration. There is. In other words, there is a limit to the increase in the permissible load torque of the shredding motor 2 when the capacity switching means 4 is operated, and if the number of shredded sheets inserted from the input port 11 is equal to or more than the permissible load torque, the capacity is increased. Paper jam occurs even when the switching means 4 is operated. Therefore, the output of the timer 45 in the control means 5 is once stored in the flip-flop 46, and when the paper jam continues to occur again, the operating flip-flop 47 is reset and the normally-open contact 49 of the shredding relay 44 is reset. Is turned off and the power supply E of the shredding motor 2 is opened.

Then, when the reverse rotation lever 28 is pressed thereafter, the swing frame 22 swings downward against the spring 27, the reverse rotation gear 25 is engaged with the drive gear 26, and the reverse rotation switch 32 is turned on. The shredder 1 is rotated in the reverse direction and the jammed shredded paper is discharged from the input port 21 (see FIG. 6).

In addition to the above, it is also possible to cope with this by limiting the width l of the charging port 11 to a number equal to or less than the allowable load torque of the shredding motor 2 when the capacity switching means 4 is operated. That is, the input width l of the input port 11 is generally regulated to be wider than the maximum number of shreds of the document shredder so that the user can use it easily.

However, there is a disadvantage that the shredded paper is easily jammed because it is wider than the maximum number of shreds. Therefore, when the capacity switching means 4 is operated, the throwing width l is less than or equal to the maximum number of shredded pieces.
If the capacity switching means 4 is not operated as long as it is regulated, the input width l of the maximum number of shreds or more in so-called normal use
Since it can be set to 1, the user's usability is not deteriorated, and shredded paper jammed during normal use can be discharged to the waste box 35 by activating the capacity switching means 4 regardless of how many sheets are jammed. .

In this way, the reversing device of the shredding motor 2 and a circuit for controlling the reversing device are not required, the number of parts can be significantly reduced, and the total cost can be reduced.

FIG. 7 shows a second embodiment of the present invention, in which capacitors 51 and 52 having different capacities are connected to the shredding motor 2 and the capacity is switched from the capacitor 51 to the capacitor 52 by the capacity switching means 4 to increase the capacity. The total impedance of the shredding motor 2 is lowered to increase the current i, and this case can be carried out in the same manner as described above.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention.

For example, the shredding device 1 and shredding motor 2 may be those other than those in the embodiment, and the capacity switching means 4 may be constituted by a semiconductor switch such as a transistor.

<Effects of the Invention> As is apparent from the above description, according to the present invention, the capacity switching means for switching the current of the shredding motor to a large amount, and the capacity switching means operated by the overload detection signal from the overload detection means Since the shredding motor is equipped with control means for supplying power for a certain period of time, even if a paper jam occurs, the shredded paper can be forcibly ejected, and shredding efficiency is comparable to that of the conventional one. And significantly improve.

Furthermore, the time to operate by increasing the current of the shredding motor is less than the time that the shredding motor does not burn out when the capacity switching means is activated to increase the current of the shredding motor,
Moreover, since the time is set to be longer than the time that the jammed shredded paper can be discharged, the shredder motor can be prevented from being burnt out because the overloaded state does not continue for a long time.

Moreover, if shredded paper that exceeds the permissible load torque of the shredder motor is thrown in, it is impossible to eject shredded paper even if the torque of the shredder motor is increased, and paper jams cannot be cleared. If you turn off the power supply later, you can eliminate paper jams by performing operations such as reversing the shredding motor and reducing the number of shredded paper, and improve shredding efficiency. it can.

[Brief description of drawings]

1 to 6 illustrate a first embodiment of a paper jam control device for a document shredder according to the present invention.
FIG. 2 is an electric circuit diagram, FIG. 2 is a block diagram of control means, and FIG.
FIG. 4 is a perspective view of the inside of the document shredder, FIG. 4 is a vertical sectional view of the document shredder, FIG. 5 is a time chart of control means, and FIG.
FIG. 7 is a time chart of the auxiliary operation of the control means, and FIG. 7 is a circuit diagram showing a second embodiment of the present invention. 1: Shredding device, 2: Shredding motor, 3: Overload detection means, 4: Capacity switching means, 5: Control means.

Claims (1)

[Claims] 1. A document shredding machine having a shredding device for shredding shredded paper, a shredding motor for driving the shredding device, and overload detection means for detecting an overload of the shredding motor. In the capacity switching means for switching the current of the shredder motor to a large level, and a control for operating the capacity switching means in response to an overload detection signal from the overload detection means and supplying power to the shredder motor for a fixed time. Means for activating the capacity switching means and raising the current of the shredding motor for a certain period of time or less so that the shredding motor does not burn out, and the time when the jammed shredded paper can be discharged. A paper jam control device for a document shredder, which is set as described above.