JPH0777627B2 - 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 Problems> The shredder of the present invention includes a cutting blade for cutting a waste document, a rotary drive motor for the cutting blade, and a cutting blade for protecting the cutting blade from mechanical deterioration. Cooling means for blowing air for cooling, or protection means for arranging cooling means for cooling the cutting blade to apply a solvent or lubricating oil in an appropriate amount for liquid cooling, a detecting means for detecting the load current of the motor, and the load. Output means for outputting a signal in response to a load current by the current detection means exceeding a predetermined value, and control means for operating the protection means for protecting the cutting blade in relation to the signal output of the output means. It is a shredder characterized by having and. Further, the signal output means is a shredder which outputs a signal when the load current exceeds a predetermined value and the state where the load current exceeds the predetermined value continues for a predetermined time. Further, the signal output means is a shredder characterized in that it outputs a signal in response to the load current exceeding a predetermined value and the total time in the exceeded state reaching a predetermined time or longer. Further, the signal output means is a shredder characterized in that it outputs a signal in response to the load current exceeding a predetermined value and the total time in the exceeded state reaching a predetermined time or longer.

<Operation> According to the shredder of the present invention, when cutting a discarded document at high speed and cutting a large amount of discarded documents, the load power of the motor for driving the cutting blade becomes large when mechanical deterioration occurs. It is made in consideration. That is, as the amount of the discarded document cut by the cutting blade increases (the cutting load increases), the current flowing through the motor increases accordingly. The cutting blade is protected by the protection means based on the load current of the motor because the increase of the load is related to the temperature rise of the cutting blade and the progress of wear.

Therefore, the cutting blade is protected, for example, provided with abrasion resistance due to cooling or application of a lubricant, and can be used continuously without being disabled.

<Embodiment> FIG. 1 is a sectional view showing a shredder equipped with a protection 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 and 5 for finely cutting the discarded document 2, a motor 6 for rotating the pair of cutting blades 4 and 5, and a pair of cutting blades 4 and 5. A scrap storage portion 7 for storing the cutting scraps cut by 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 waste 2 is continuously sent from the lower part to the cutting blades 4 and 5 and cut. Here, if necessary, as will be described later, a detection switch 11 for detecting a document is provided in the middle of the document conveyance path between the standby chamber 3 and the cutting blades 4 and 5.
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.
In order to protect the cutting blades 4 and 5 in order to prevent mechanical deterioration of the cutting blades 4 and 5, for example, a blower 12 for blowing air for cooling the cutting blades 4 and 5 has a cutting blade 4 in the shredder 1.
It is arranged to correspond to. 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. Also,
In the drawing of the blower 12, a suction motor (not shown) for sucking air and discharging the air to the outside of the shredder 1 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 mechanical 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 shows a state in which the shredder is provided with another protective device as the protective device according to the present invention. Unlike FIG. 1, this is a liquid cooling device capable of cooling the cutting blades 4 and 5 for the same purpose as a cooling device by an air flow. This can have not only cooling, but also the effects of abrasion resistance and cleaning of the cutting blade.

In FIG. 2, the same parts in FIG. 1 are designated by the same reference numerals, and the description thereof will be omitted. As shown in the figure, the protection 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 this 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
The liquid flow path 25 exposed to face the container 23 and the center of rotation (support shaft) 26 provided at the bottom of the container 23 are rotated clockwise as needed to rotate the container 23 clockwise to cut the felt material 22. The solenoid 27 for applying the liquid 21 by bringing the container 21 into contact with, the spring 28 for rotating the container 23 counterclockwise when the solenoid 27 is not energized, and the rotation of the container 23 when the container 23 rotates counterclockwise. It is composed of a stopper 29 that restricts further rotation.

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. .

Next, the conditions under which the protective device is driven in order to impart the wear resistance and cleaning effect of the present invention to the cutting blade 4 will be described below.

First, the protection operation of the protection device will be briefly described. If necessary, for example, the solenoid 27 is energized, the container 23 rotates clockwise in the drawing, and the end of the felt material 22 comes into contact with 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 predetermined purpose is achieved, the solenoid 27 is de-energized, and is rotated counterclockwise in the figure by the spring 28, so that the container 23 comes into contact with the stopper 29 and stops.

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 or to replenish the necessary amount only when necessary.

1 and 2 show an example of a cooling device or a coating device for coating a solvent, a lubricant or the like as a protection device of the present invention. This cooling device is always operated on the cutting blades 4 and 5. However, it is more preferable to apply the bias only when necessary, that is, when a certain condition is satisfied. This condition is a condition for preventing mechanical deterioration. For example, it is a case where the cutting blade detects a state before the cutting blade falls into an unusable state due to mechanical deterioration.

Further, when the cooling device as the protective device is blown with 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 dirt of the paper after cutting or the cutting paper is cut. The cutting efficiency may decrease due to the liquid impregnation.

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

FIG. 3 is a block diagram showing an example for driving and controlling the protection device according to the present invention. The present invention detects the load current of the motor 6 that drives the cutting blades 4 and 5, and drives the protection device based on this detection. That is, the motor 6
Causes an increase in load current due to an increase in load cut by the cutting blades 4 and 5. Therefore, it is related to the temperature rise of the cutting blades 4 and 5 or the progress of wear. Especially the cutting blade 4,
One of the causes for the temperature of 5 to rise is when a large amount of waste document 2 is cut by a cutting blade or when cutting is performed with dirt or the like attached to the cutting blade. In such a case, the load on the motor 6 also increases, and the load current naturally increases. Also,
If the cutting is continued in such an adverse state, the abrasion of the cutting blade increases. Therefore, by detecting the load current of the motor 6 and driving the protective device shown in FIG. 1 or 2, the adverse effect due to the mechanical deterioration as described above can be prevented.

In the figure, the detection signal 30 from the load current detection means of the motor 6 and a reference value 31 are input to a comparison circuit to compare the two. The comparison circuit 32 outputs a comparison signal by inputting the signal 30 from the load current detection means larger than the reference value 31. That is, the reference value 31 is set to be larger than the load current generated when the motor 6 is in the normal load state and smaller than the load current value generated when the motor 6 is in the large load state. Therefore, when the load on the motor 6 becomes larger than the reference value, the comparison circuit 32 outputs a comparison signal.

The signal from the comparison circuit 32 is added to a timer circuit 33 which supplies an activation signal to a drive circuit 34 for driving the protection device. Therefore, the timer circuit 33 counts the time for outputting the signal for driving the protection device for a certain period of time. The certain period of time is set to a period of time during which the protective device can be driven to sufficiently protect the cutting blades 4 and 5. When the timer circuit 33 receives the signal from the comparison circuit 32, the timer circuit 33 drives the timer setting time signal to the drive circuit 34. Therefore, the driving circuit 34 operates to protect the cutting blades 4 and 5 by driving the protective device shown in FIGS. 1 and 2. That is, the drive circuit 34 drives the motor of the blower 12 for cooling with air or the solenoid 27 for liquid application, and cooling or application of a solvent or the like is performed.

Therefore, before the cutting blades 4 and 5 become inoperable due to mechanical deterioration, a protection device for cooling, cleaning, and abrasion resistance is driven to protect the cutting blades.

Further, in FIG. 3, the output signal of the timer circuit 33 is inputted to the reset input terminal R of the timer circuit via the differentiating circuit 35. That is, the timer circuit 33 is reset after counting a predetermined time, and waits for the next input of the comparison signal from the comparison circuit 32.

With the circuit configuration as described above, before the mechanical deterioration including the thermal deterioration of the cutting blades 4 and 5 occurs, in order to prevent this deterioration, a signal is output from the comparison circuit 32, so that the blower 12 or The solenoid 27 is energized. Therefore, the cutting blade
The wear resistance of the cutting blades 4 and 5 is obtained by cooling the blades 4 and 5 with air or the liquid 21 or by applying a lubricant or the like. In addition, the coating of the solvent or the like removes the contamination of the cutting blades 4 and 5, that is, removes the dirt and the like and prevents the adhesion of the dirt. This operation continues until the timer time of the timer circuit 33 is counted, and after this timer time, the protection operation is stopped and the cutting operation accompanying the rotation of the cutting blades 4 and 5 is restarted.

Further, FIG. 4 shows an example of driving the protection device when it is determined that there is a considerable time before the cutting blades 4 and 5 become mechanically deteriorated when the mechanical deterioration of the cutting blades 4 and 5 is detected. That is, even if the load on the cutting blades 4 and 5 increases, the mechanical deterioration, for example, the temperature of the cutting blades will not rise sharply but will gradually rise. Therefore, it can be said that the protective device may be driven when the load current of the motor 6 continues to exceed the reference value for a predetermined time.

The same parts as those in the circuit configuration diagram of FIG. 3 are designated by the same reference numerals, and the description thereof will be omitted. The comparison signal from the comparison circuit 32 is input to the set input terminal S of the timer circuit 41. The timer circuit 41 counts a state before mechanical deterioration due to an increase in load on the motor 6. That is, the timer circuit 41 measures the operation time due to the increase in the load due to the cutting blade, and drives the protection device based on the measurement result. The timer circuit 41 is input to the reset input terminal R via an inverter 42 and an OR gate 43 which invert the comparison signal of the comparison circuit 32. In other words, assuming that one of the factors causing mechanical deterioration when the load current of the motor 6 becomes normal disappears, the timer circuit 41
The time count of is cleared and the protective device is not driven.

The timer circuit 41 outputs a signal 44 after counting a predetermined time. That is, assuming that the cutting blade is protected by mechanical deterioration due to continuous operation, the timer circuit 41
The operation time due to the increased load by the cutting blade is measured, and the signal 44 is output according to 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 for driving the protection device for a certain period of time. The drive signal forming circuit 45 is the timer circuit 33 of FIG.
The same operation is performed, and the drive signal is supplied to the drive circuit 46 until the cutting blade is sufficiently protected by the drive of the protection 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, the timer circuit 41 measures the time during which the cutting blade operates while the load current 30 of the motor 6 exceeds the reference value 31. If this measurement time is longer than a predetermined time in the timer circuit 41, that is, if the state in which the load current of the motor 6 exceeds the reference value is longer than the set time of the timer circuit 41, mechanical deterioration is prevented. For this purpose, the timer circuit 41 outputs a signal. for that reason,
In response to the signal from the timer circuit 41, the drive signal forming circuit
The protection operation is performed by the protection device via the drive circuit 46 only for the drive signal output time of 45. However, if the load current of the motor 6 becomes equal to or lower than the reference value before the time-up signal is output from the timer circuit 41, the timer circuit
Since 41 is reset, the protective device is not activated.

In the example of FIG. 4, the protective device is driven when the time due to the increase of the load current by the motor 6 exceeds a predetermined time. However, if the increase state of the load current by the motor 6 ends within a predetermined time, the protection device is not driven. If such a state is repeated and the protective device is not driven, for example, mechanical deterioration may be accumulated and the state may not always be disabled. Therefore, when the total load time of the motor 6 exceeds the set time of the timer circuit 41, more effective control can be performed by driving the protective device.

FIG. 5 shows an example thereof. In FIG.
The same parts as those in FIG. 4 are designated by the same reference numerals, and the description thereof will be omitted.

The comparison signal from the comparison circuit 32 is input to the set input terminal of the flip-flop 51. This flip flop
The reset input terminal of 51 is supplied with the comparison signal from the comparison circuit 32 via an inverter 52 so as to be inverted and output. The set output terminal of this flip-flop 51 is
It is supplied to the set input terminal of the timer circuit 41. The timer circuit 41 counts time while a signal is input to the set input terminal, and the count content is cleared when the signal is supplied to the reset input terminal. In particular, the timer circuit 41 suspends the counting operation when there is no signal input to the set input terminal, and restarts the counting operation when there is a signal input. Other circuit configurations are
It is the same as in FIG.

In the above circuit configuration, when the load current 30 of the motor 6 exceeds the reference value 31, the comparison signal from the comparison circuit 32 is received and the flip-flop 51 is set. The time output of the timer circuit 41 is started by the set output of the flip-flop 51. Then, when the load current of the motor 6 decreases (the cutting load of the cutting blade decreases), the comparison signal from the comparison circuit 32 does not appear, and the flip-flop 51 via the inverter 52.
Is reset. Therefore, the time count of the timer circuit 41 is suspended.

After that, when the load current of the motor 6 increases again, the comparison signal is output from the comparison circuit 32.
Time counting is restarted. Therefore, the timer circuit 41
Will measure the total time when the load current of the motor 6 increases. The time count by this timer circuit 41 is
When the predetermined time is reached, a time-up signal is output,
The protection device is driven in the same manner as in FIG.

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 a protective device, in order to prevent mechanical deterioration, a cooling means such as spraying air or applying oil for cooling is used, but not limited to this, other cooling devices may be used. Good. Further, the protective device is not limited to the cooling device, but is not limited to the one that applies the solvent to the cutting blade, or cleans the cutting blade by applying a lubricant, or protects the cutting blade by obtaining abrasion resistance. , Other means may be used.

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

In particular, a plurality of protective devices may be arranged according to the state of mechanical deterioration, and each protective device may be individually controlled based on the load current of the motor 6. For example, it is considered that there is a difference between the load current of the motor due to the adhesion of dirt or the like to the cutting blade and the load current of the motor when cutting a large amount of documents to be scraped by the cutting blade. The protection devices can be controlled individually.

<Effect> As described above, according to the shredder of the present invention,
Mechanical deterioration including thermal deterioration is detected based on the load current of the motor for driving the cutting blade, and in response to this detection, cooling means that blows air to the cutting blade to cool it, or the cutting blade. Since the cutting blade is protected by using a cooling means for applying an appropriate amount of solvent or lubricating oil to the liquid and cooling the liquid, mechanical deterioration of the cutting blade can be prevented and the speed 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, FIGS. 3, 4, and 5. The figure is a block diagram showing an example of a control circuit configuration for driving and controlling the cooling device shown in 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 30; Motor load current detection signal 31; Reference value, 32; comparison circuit 41; timer circuit, 46; protection device drive circuit

Claims (6)

[Claims] 1. A cutting blade for cutting a waste document, a rotary drive motor for cutting the cutting blade, and a cooling means for blowing air to the cutting blade to cool the cutting blade in order to protect the cutting blade from mechanical deterioration. Protection means, detection means for detecting the load current of the host motor, output means for outputting a signal in response to the load current detected by the load current detection means exceeding a predetermined value, and signal output of the output means And a control means for operating the protection means for protecting the cutting blade in relation to the shredder. 2. The shredder according to claim 1, wherein the signal output means outputs a signal when the load current exceeds a predetermined value and the state in which the load current exceeds the predetermined value continues for a predetermined time. 3. The signal output means outputs a signal in response to a load current exceeding a predetermined value and further reaching a predetermined time or more in a state where the load current exceeds the predetermined value. The shredder according to claim 1. 4. A cutting blade for cutting a waste document, a rotary drive motor for cutting the cutting blade, and a liquid cooling for applying a proper amount of solvent or lubricating oil to the cutting blade to protect the cutting blade from mechanical deterioration. Protecting means for arranging cooling means, detecting means for detecting the load current of the motor, and output means for outputting a signal in response to the load current detected by the load current detecting means being a predetermined value or more. And a control means for operating the protection means for protecting the cutting blade in relation to the signal output of the output means, the shredder. 5. The shredder according to claim 4, wherein the signal output means outputs a signal when the load current exceeds a predetermined value and the state in which the load current exceeds the predetermined value continues for a predetermined time. 6. The signal output means outputs a signal in response to a load current exceeding a predetermined value and a total time of the exceeded state reaching a predetermined time or more. The shredder according to claim 4.