JPH0777628B2 - Shuretsuda - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a shredder, and particularly to a shredder capable of processing a wide variety of sheet-like cuts at high speed.

<Prior Art> A shredder cuts an ordinary sheet-like object such as a document with a cutting blade.

Recently, as the amount of thin information support such as sheet or tape increases with the increase of information amount, the number of information supports to be discarded also increases, and it is further desired to increase the speed of the shredder to cope with these. .

Therefore, instead of manually inserting the discarded documents into the cutting blade, the discarded documents stacked and bundled are automatically fed using the paper feeding means, and the discarded documents are continuously fed to the cutting blade. . The speed is increased by increasing the feeding speed and the rotation speed of the cutting blade.

<Problems to be Solved by the Invention> However, in the existing shredders, simply increasing the speed cannot deal with the problem. In other words, in order to deal with the increase and diversification of the amount of information support, simply performing high-speed processing causes a problem of reduction in cutting efficiency due to mechanical deterioration, thermal deterioration or contamination of the cutting blade of the shredder. To do. For example, the cutting blade becomes unusable and does not serve as a shredder. Such mechanical deterioration or the like, depending on the type of the cutting blade, causes an early or late limit for high-speed functioning, although there is a degree of difference.

Attempting to deal with this problem means increasing the number of installed shredders, but this has various problems related to cost savings, space, resources, and the like.

In view of the above problems, the present invention is to provide a shredder capable of high-speed processing while protecting the cutting blade under appropriate conditions for the cutting blade of the shredder.

<Means for Solving the Problem> The shredder of the present invention comprises a cutting blade for cutting a waste document, a temperature detecting means arranged near the cutting blade for detecting the temperature of the cutting blade, or an operation of the cutting blade. An operating time detection means for measuring time, a cooling means for cooling the cutting blade, and a control means for operating the cooling means to cool the cutting blade in response to a detection signal from the detection means. It is a shredder characterized by that. Further, the cooling means is a shredder characterized by being an air cooling device or a liquid cooling device.

<Operation> According to the shredder of the present invention, the cutting of the discarded document is processed at a high speed, and if the processing time becomes long, the temperature of the cutting blade becomes high and the thermal deterioration is caused. However, when the detecting means detects the thermal condition of the cutting blade, the cooling means operates to cool the cutting blade. Therefore, the cutting blade is cooled and can withstand continuous use after cooling.

<Example> FIG. 1 is a sectional view showing a shredder provided with a cooling device according to the present invention. In the figure, a shredder 1 is provided with a disposal document waiting chamber 3 for accommodating disposal documents 2.
A pair of rotating cutting blades 4,5 for finely cutting the waste document 2, a motor 6 for rotating the pair of cutting blades 4,5, and a pair of cutting blades 4, A scrap storage portion 7 for storing the cutting scraps cut by 5 is provided.

A cover 8 is provided on the upper portion of the discarded document standby chamber 3 so as to be openable and closable, and prevents documents that do not need to be cut from being easily mixed into the standby chamber 3 and cut.

In the shredder 1, the motor 6 is energized by operating an operation start switch (not shown) on the operation panel, and the motor 6 is deenergized by operating an operation stop switch (not shown). When the motor 6 is energized, its rotational force is transmitted to the cutting blades 4 and 5 and the paper feed roller 9 via transmission means such as a transmission chain and a sprocket (not shown). The paper feed roller 9 is provided in the document standby chamber 3 and continuously sends out the discarded documents 2 loaded in the standby chamber from the lower part to the space between the cutting blades 4 and 5.

Along with the transmission of the rotational force, the cutting blades 4, 5 and the paper feed roller 9
Rotates in the direction of the arrow, and the discarded document 2 is continuously sent out from the lower part to the cutting blades 4 and 5 and cut. here,
If necessary, the waiting chamber 3 and the cutting blades 4 and 5 will be described later.
A detection switch for detecting documents in the middle of the document transport path between
11 are arranged. Further, the paper feed roller 9 is drive-controlled via a clutch or the like in order to stop the paper feed of the discarded document 2, and the drive of the paper feed roller 9 may be stopped when the cooling device of the present invention is driven. is there.

According to the present invention, when continuously cutting documents, a cutting blade is used.
A blower 12 for blowing air is arranged so as to correspond to the cutting blade 4 in the shredder 1 for the purpose of cooling the cutting blades 4 and 5 in order to prevent particularly thermal deterioration of the cutting blades 4,5. . A motor for driving the blower 12 is arranged, for example, on the front upper side in the drawing. The blower 12 is driven by a motor different from the motor 6 described above, and is arranged in a state in which the blowing port is inclined so as to be tilted toward the back side in the drawing so that the air to be blown hits the entire cutting blade 4. ing. In order to take in the air of the blower 12 from the outside of the shredder 1, an air intake port is provided in the outer frame of the shredder 1 on the front side in the drawing. Further, a suction motor (not shown) for sucking air and discharging the air to the outside of the shredder 1 in the drawing of the blower 12 and an exhaust port of the outer frame of the shredder 1 are provided, respectively.

Further, in order to enhance the cooling effect, an air circulation duct may be provided between the blower 12 or suction and the cutting blade 5 so that the blowing flow or the suction flow directly acts on the cutting blade 5. It should be noted that one of the blower 12 and the suction may be removed if necessary.

In the configuration of FIG. 1, before the thermal deterioration of the cutting blades 4 and 5, this is detected in advance, the blower 12 is driven, and the cutting blades 4 and 5 are cooled. In this case, if there is a risk that finely cut debris will be scattered due to the blowing of air, the operation of the paper feed roller 9 is stopped, and the air is cooled while the cutting operation is restricted. However, if the waste container 7 is placed in a negative pressure state by suction or the like to prevent scattering of the cutting waste, the cutting operation is continuously performed without stopping the paper feed roller 9 and the like, A cooling operation may be performed.

The shredder shown in FIG. 2 is a liquid cooling device capable of cooling the cutting blades 4 and 5 for the same purpose as a cooling device using an air flow. This can have not only cooling, but also the effects of cutting blade wear, cleaning, and the like.

In FIG. 2, the same parts as those in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. As shown in the figure, the cooling device in FIG. 2, that is, the liquid cooling device 20, has a wide upper opening and a relatively narrow opening, and applies the liquid 21 and the liquid 21 to the cutting blade 4 in an appropriate amount. Felt material for
A container 23 that holds a part of the container 22, an opening / closing lid 24 for opening and closing the upper opening of the container 23, and the felt material 22 that is connected to the lower opening of the container 23 and allows an appropriate amount of liquid to pass inside.
While holding the edge of the felt material 22 with the cutting blade 4
And the liquid flow path 25 exposed to face the container, and the center of rotation (support shaft) 26 provided at the bottom of the container 23 as a center, the container 23 is rotated clockwise as necessary to cut the felt material 22 by a cutting blade. A solenoid 27 for contacting with 4 and applying the liquid 21;
A spring 28 that rotates the container 23 counterclockwise when the solenoid 27 is not energized, and a stopper 29 that stops the rotation of the container 23 when the container 23 rotates counterclockwise and restricts further rotation. There is.

Therefore, the appropriate amount of the liquid 21 applied to the cutting blade 4 is poured into the container 23 from the upper opening of the container 23 with the opening / closing lid 24 opened. The poured liquid 21 is impregnated into the felt material 22 and reaches the end portion of the felt material 22 facing the cutting blade 4 via the inside of the felt material 22 in the flow path 25. .

Subsequently, the liquid cooling device 20 is driven in order to provide wear resistance and cleaning effect in addition to the cooling effect of the cutting blade 4 according to the present invention. That is, the solenoid 27 is energized as needed, the container 23 rotates clockwise in the drawing, and the end of the felt material 22 contacts the cutting blade 4 accordingly, and the liquid 21 is applied. This provides the cooling effect and other cleaning and wear resistance. After that, when the prescribed purpose is achieved,
The solenoid 27 is de-energized, and the spring 28 rotates it counterclockwise in the figure, and the container 23 stops.
Abut 29 and stop.

As the liquid 21, not only the cooling effect of the cutting blade 4 but also the wear resistance and the like can be obtained by using a normal lubricating oil or an oil containing molybdenum disulfide or the like.
Further, in order to clean the cutting blade 4 against adhesion of substances such as ink, toner and glue on the sheet-shaped support or prevent the adhesion of the substances, oil containing abrasive, silicon or polytetrafluoro It is preferable to use an oil or a solvent containing a releasing agent such as a fluorine compound such as ethylene or a solvent such as toluene. However, when alcohol, toluene or the like is used, it is preferable to seal the entire system of the coating device when not in use, but replenish the necessary amount only when necessary.

FIG. 1 and FIG. 2 show an example of the cooling device of the present invention, and this cooling device may be always operated on the cutting blades 4 and 5, but when necessary, that is, under certain conditions. It is more preferable to urge only when This condition is a condition for preventing thermal deterioration. For example, this is the case when the temperature of the cutting blade is detected before the thermal deterioration occurs.

Further, as a cooling device by blowing air, scattering of paper powder or the like generated at the time of cutting the paper, and in liquid cooling, it is difficult to collect due to liquid stain of the paper after cutting or liquid impregnation of the cut paper. Cutting efficiency may decrease. Therefore, it is necessary to avoid the above as much as possible. Therefore, the cutting is temporarily stopped, the cooling means is driven, and then the cutting operation is restarted. Here, in order to suspend the cutting, for example, the rotation of the paper feed roller 9 may be stopped. However, if that is not necessary, the cutting operation may be continued without stopping the cutting operation during the cooling operation.

Further, the cooling device is activated only when the inconvenience of the cutting blade can be avoided, which is advantageous in terms of cost and material saving.

Therefore, the driving of the cooling device will be described in detail below.

FIG. 3 is a block diagram showing an example for driving and controlling the cooling device according to the present invention. In the figure, when a temperature detection signal 30 from a temperature detection means is applied to a set input terminal S of a timer circuit 31, the timer circuit 31 counts time and outputs a signal 32 for driving a cooling device. To do. This signal 32 is a drive circuit for driving the cooling device.
In addition, the drive circuit 33 activates the cooling device to cool the cutting blades 4 and 5 of FIGS. 1 and 2. That is, the drive circuit 33 drives the motor of the blower 12 for cooling by air or the solenoid 27 for applying the cooling liquid,
Air blowing or liquid application is performed.

The temperature detecting means has a temperature detecting element such as a bimetal or thermistor for detecting the temperature, which is arranged in the vicinity of the cutting blade 4, and outputs a signal 30 when the temperature exceeds a predetermined value according to the temperature signal. It is what is output. The temperature at this time varies depending on the type of the cutting blade, and may be set to a value that can prevent thermal deterioration of the cutting blade. Also,
The timer circuit 31 stops the output of the signal 32 when a predetermined time is counted by the set signal input. Therefore, the timer time of the timer circuit 31 is set to a time in which the cutting blade is sufficiently cooled.

Further, in FIG. 3, the output signal 32 of the timer circuit 31 is inputted to the reset input terminal R of the timer circuit via the differentiating circuit 34. That is, when the timer circuit 31 counts the predetermined time, it is reset and has the input of the next temperature detection signal 30.

With the circuit configuration as described above, when the cutting blade 4 exceeds the temperature before it is thermally deteriorated, the blower 12 or the solenoid 27 is energized by outputting the signal 30 in order to prevent the thermal deterioration. To be done. Therefore, the cutting blades 4 and 5 are cooled by the air or the liquid 21. This operation continues until the timer time of the timer circuit 31 is counted, and after this timer time, the cooling operation is stopped and the cutting operation accompanying the rotation of the cutting blade 4 is restarted.

Further, FIG. 4 shows that the cooling device is driven based on the operating time of the cutting blades 4 and 5 without directly detecting the temperature of the cutting blade 4. That is, the cutting blades 4 and 5 increase in temperature according to the time for cutting. Therefore, when this operation time exceeds a predetermined time, the cooling device is driven in order to prevent thermal deterioration of the cutting blades 4 and 5.

In the figure, a signal 40 based on the operation of the operation start switch for starting the operation of the shredder is applied to the set input terminal S of the timer circuit 41. The timer circuit 41 counts when the temperature of the cutting blade reaches the temperature before the thermal deterioration occurs. That is, the timer circuit 41 measures the operating time of the cutting blade and plays the same role as the temperature detecting means shown in FIG. The timer circuit 41 supplies a signal to the reset input terminal R by a switch operation for stopping the operation of the shredder.
42 is input via the OR gate 43. Therefore,
The timer circuit 41 stops the counting operation up to now by stopping the operation of the shredder, clears the count content, and waits for the start of the operation of the next shredder.

The timer circuit 41 outputs a signal 44 after counting a predetermined time. That is, it is considered that the cutting blade has reached the predetermined temperature by the continuous operation, the timer circuit 41 measures the operation time of the cutting blade, and outputs the signal 44 by a predetermined time count. In response to the output of the signal 44, the drive signal forming circuit 45 is energized to energize the drive circuit 46 that drives the cooling device for a certain period of time. That is, the drive signal forming circuit 45 performs the same operation as the timer circuit 31 of FIG. 3, and supplies the drive signal to the drive circuit 46 until the cutting blade is sufficiently cooled by driving the cooling device. The signal from the timer circuit 41 is applied to the reset input terminal R through the differentiating circuit 47 and the OR gate 43 to reset the timer circuit.

In the above circuit configuration, if the operating time of the cutting blade is longer than the predetermined time, that is, the time counted by the timer circuit 41, the cutting blade may be thermally deteriorated due to the temperature rise. Therefore, in response to the signal from the timer circuit 41, the drive circuit 46 is driven for the drive signal output time of the drive signal forming circuit 45.
A cooling device, that is, a cooling operation by spraying air or applying a liquid is performed via the. However, the timer circuit 41
If the operation of the shredder is stopped before the time-up signal is output, the timer circuit 41 is reset, so that the cooling device is not driven. That is, the cutting blade 4 is processed as if it is not at a temperature that causes thermal deterioration.

The example shown in FIG. 4 is an embodiment in which the cutting blade is replaced by temperature detection as shown in FIG. 3 depending on the operating time of the cutting blade. This 4th
According to the figure, the operation time of the cutting blade is measured by starting and stopping the operation of the shredder, but the document to be cut 2
It may be performed based on the detection of passage. That is, the cause of the temperature increase of the cutting blade is when the document is being cut, and it is preferable to count the cutting time.

An implementation circuit therefor is shown in FIG. In the figure, in order to count the operation time at the time of cutting by the cutting blade,
The time is measured in response to the detection of the paper detection switch 11 shown in FIG. That is, the detection switch 11
Detection signal 50 is applied to the set terminal S of the timer circuit 51. This timer circuit 51 is the same as the timer circuit 41 of FIG. 4, and outputs a signal 54 after counting a predetermined time.

The detection signal 40 of the detection switch 11 is inverted and output by the inverter 52, and is supplied to the reset terminal R of the timer circuit 51 via the OR gate 52. That is, when the paper is used up, the non-detection signal of the paper is input to the reset terminal via the inverter 52 to reset the timer circuit 51. Therefore, when the discarded document 2 is lost, the cutting blade 4,
In the case of No. 5, there is almost no factor that causes the temperature to rise, and the temperature does not rise compared to when cutting. Therefore, even if the cutting blade is rotated in this state, the temperature does not rise, so the measurement of the operating time by the timer circuit 51 is stopped.

The driving of the cooling device by this circuit is the same as that in FIG. 4, and its operation is omitted. In particular, if the actual continuous cutting operation of the cutting blade exceeds the time measured by the timer circuit 51, the cooling device is driven for a fixed time.

In FIG. 5, when the discarded documents 2 are continuously fed, the timer circuit 51 is reset if the detection switch 11 detects the absence of paper due to a temporary paper feed failure of the paper feed roller 9 or the like. Then, the timer circuit 51 counts the time from the beginning when the discarded document 2 sent next is detected. As a result, the cooling device is not driven even though the temperature of the cutting blade is thermally deteriorated. In order to prevent such a situation, by delaying the signal 50 output from the detection switch 11 and inputting it to the OR gate 53 by delaying the signal output via the inverter 42, the above-mentioned problem can be prevented.

That is, by delaying the output of the inverter 52 for a predetermined time, the discarded document 2 is detected by the detection switch 11 again within this delay time.
Is detected at the set input terminal S of the timer circuit 51,
Since a signal is input, reset input terminal R
Even if a delayed signal is input to the timer circuit 51, the timer circuit 51 cannot be reset. The delay signal may be canceled by the detection of the document 2 by the detection switch 11.

The above-mentioned problem does not occur due to a temporary paper feed failure due to the paper feed roller, and also occurs when the placed document 2 in the standby chamber 3 is lost and the next bundle of discarded documents 2 is replenished again. Even in such a case, it can be dealt with by configuring as described above.

Further, according to the control circuit configuration of FIG. 4 or 5, when the shredder main body is stopped and then restarted, if the time until this restart is short, the temperatures of the cutting blades 4 and 5 are completely lowered. Despite not doing so, the timer circuit 41 or 51 restarts the time counting from the reset state. This is because the time is measured again from the initial state after the timer circuit has been reset, so even if the cutting blade further rises in temperature and is thermally deteriorated, the cooling operation of the present invention is not completed and cannot be used. It is highly possible that

Therefore, as shown in FIG. 6, the shredder operation start signal 40 is applied to the reset input terminal of the second timer circuit 48, and the shredder operation stop signal 42 is applied to the set input terminal of the second timer circuit 48. In addition, this timer circuit 48
The time-up signal of is input to the reset input terminal of the time circuit 41 via the OR gate 49. Here, the second time circuit 48 is set to a time in which the temperature of the cutting blades 4 and 5 is sufficiently lowered to a temperature unrelated to the thermal deterioration. The timer circuit 48, when a signal is input to the reset input terminal before the time-up output by the set time count is performed,
Clear the count contents.

Therefore, after the operation of the shredder main body is stopped, even if the second timer circuit 48 counts the set time, if the operation of the shredder main body is not restarted, the temperatures of the cutting blades 4 and 5 are sufficiently lowered. Therefore, a time-up signal for stopping the counting operation of the timer circuit 41 is added to the time circuit 41, and the count content of the timer circuit 41 is cleared. However, if the operation restart time is shorter than the set time of the second timer circuit 48 after the operation of the shredder main body is stopped,
Since the second timer circuit 48 is reset, the timer circuit
The count content of 41 is not cleared, and the time count operation continues. Therefore, even if the shredder main body temporarily stops operating, the timer circuit 41 continues to count, and the cooling device is activated when the timer circuit 41 counts a predetermined time. It is possible to prevent physical deterioration. Where the timer circuit
41, when the operation of the shredder main body is stopped, the time counting operation is stopped, and when the cutting operation is started again,
The counting operation is restarted after continuing the counting contents up to now.

Further, FIG. 5 may also be configured as shown in FIG. That is, the signal 50 based on the detection of the discarded document 2 is transmitted to the second
It is supplied to the reset input terminal of the timer circuit of
The inverted signal (the signal via the inverter) is applied to the set input terminal of the second timer circuit. Then, by adding the time-up signal of the second timer circuit to the reset input terminal of the timer circuit 51, it is possible to eliminate the inconvenient state when the time from the operation stop of the shredder main body to the operation restart is short as shown in FIG. This can be said to be a state similar to the state in which the discarded document 2 temporarily falls into the non-paper feed state described above, and the second time circuit corresponds to the delay circuit.

Although the embodiments of the present invention have been described above, the present invention is not limited to those described in the embodiments. For example, as the cooling device, cooling means other than spraying air, applying oil or the like for cooling, or the like may be used. Further, in order to detect the thermal condition, the case of directly detecting the temperature of the cutting blade and the case of measuring the operation time of the cutting group are illustrated, but the present invention is not limited to this, and the heat is detected by another detecting means. The physical condition may be detected.

Furthermore, in the embodiment, an example in which one shroud cooling device is provided in the shredder has been shown, but it is obvious that two or more of each of the above cooling devices may be provided, and each shroud may be equipped with a cooling device shown in FIG. It may be driven according to the control circuit shown in FIG.

<Effect> As described above, according to the shredder of the present invention,
The temperature detection element detects the temperature of the cutting blade or detects the operating time of the cutting blade and blows air or applies liquid before causing thermal deterioration in response to this detection signal. Since the cutting blade is cooled, the thermal deterioration of the cutting blade can be prevented in advance, and the speedup of the document cutting process can be sufficiently dealt with.

In particular, it becomes possible to process various information supports for disposal at high speed and continuously as compared with the conventional device.

[Brief description of drawings]

1 is a sectional view showing a shredder provided with a cooling device according to the present invention, and FIG. 2 is a sectional view showing a shredder provided with another cooling device according to the present invention, FIG. 3, FIG. 4, FIG. FIG. 6 and FIG. 6 are block diagrams showing an example of a control circuit configuration for driving and controlling the cooling device of FIG. 1 and FIG. 1; Shredder, 2; Waste document 3; Waste document standby chamber, 4,5; Cutting blade 6; Motor, 11; Detection switch 12; Blower, 20; Liquid cooling device 31, 41, 51; Timer circuit 32, 46, 56; Drive circuit (cooling device)

Claims (6)

[Claims] 1. A cutting blade for cutting a discarded document, a temperature detecting means arranged in the vicinity of the cutting blade for detecting the temperature of the cutting blade, a cooling means for cooling the cutting blade, and the detecting means. And a control means for cooling the cutting blade by operating the cooling means in response to the detection signal of the shredder. 2. The shredder according to claim 1, wherein the cooling means is an air cooling device. 3. The shredder according to claim 1, wherein the cooling means is a liquid cooling device. 4. A cutting blade for cutting a discarded document, an operating time detecting means for measuring an operating time of the cutting blade, a cooling means for cooling the cutting blade, and a response to a detection signal from the detecting means. And a control means for operating the cooling means to cool the cutting blade. 5. The shredder according to claim 4, wherein the cooling means is an air cooling device. 6. The shredder according to claim 4, wherein the cooling means is a liquid cooling device.