JP2006167497A - Shredding apparatus and control method for fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a shredding apparatus capable of varying a rotation speed of a fan, if necessary, while suppressing increase of a cost. <P>SOLUTION: Two-speed control of the fan 23 such as usual rotation (full speed operation, continuous operation, high speed rotation) and low speed rotation (intermittent operation) is performed by CPU. Namely, action of the usual rotation is realized by continuous ON of the fan 23 and action of the low speed rotation is realized by intermittent pulse output of ON from CPU. The action of the low speed rotation repeats ON and OFF, for example, in every 100 ms. An air amount can be reduced, for example, by decreasing the rotation speed from 3,800 rpm to approximately 2,000 rpm. Thereby, reduction of noise, suppression of power consumption and prevention of raising of an internal temperature can be realized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a shredding device, and more particularly to a shredding device for shredding paper to be discarded and a fan control method.

As the information society evolves to a high degree, various image forming apparatuses (printers) become widespread, and there is a concern about the problem of inadvertent diffusion of confidential documents. In addition, as the opportunities for handling confidential documents increase, awareness of the risk of information leakage has increased. From this background, when a confidential document is discarded, it is generally performed to shred the confidential document with a shredder in order to prevent information leakage and protect privacy. Yes.
In addition, in order to effectively use paper resources due to increased awareness of environmental issues, the paper fragments (chopped products) resulting from shredding are not incinerated, for example, cushioning materials for packing products and raw materials for recycled paper. As being reused.

  Some shredders incorporate an electric motor (electric motor) as a drive source for shredding processing. That is, when a sensor provided at the insertion port detects that a document to be shredded has been input into the insertion port, the motor automatically operates to rotate the rotary blade. When the rotary blade rotates, the document at the slot is drawn into the shredder and the document shredding process is started. When it is determined that the shredding process has been completed for all of the documents input to the input port, the motor automatically stops and the rotation of the rotary blade stops.

Here, when a motor is installed inside the apparatus, heat is generated as the motor operates, and the internal temperature rises. In order to suppress the increase in the internal temperature, it is generally performed to provide a fan for forcibly discharging the heat in the apparatus (for example, see Patent Document 1).
Japanese Patent Application Laid-Open No. H10-260260 discloses that drive control is performed so that the temperature inside the image forming apparatus is a predetermined temperature, for example, 12 ° C. higher than the temperature outside the apparatus.

Japanese Patent Laid-Open No. 61-282856 (pages 2 and 3, FIG. 1)

A shredder having a drive source for shredding processing (hereinafter also referred to as shredding processing device or used paper processing device) is provided with a fan in order to suppress an increase in the internal temperature of the device. On the other hand, in the shredding device, there are many paper dusts that are generated along with the shredding process. In particular, in the case of the shredding process that tears the paper and leaves the paper fibers intact, more paper dust is generated. For this reason, if it is rotated at such a high speed that the paper dust is caused to rise in the apparatus, the air volume increases, and there is a concern that the paper powder may come out of the apparatus from the input unit, the open / close door, or the like. In addition, the filter provided adjacent to the fan may unnecessarily clog up the filter due to the rise of paper dust.
Therefore, when the amount of heat generated by the drive source is large, for example, during shredding processing, it is necessary to rotate the fan at high speed to quickly exhaust heat. It must be rotated at such a low speed that it does not come out of the device. As a fan that satisfies such a requirement, a variable speed fan capable of selecting different speeds is commercially available.
However, since this variable speed fan is more expensive than a constant speed fan that rotates at a constant speed, the use of a variable speed fan increases the cost and makes it difficult to reduce the cost.

The present invention has been made in order to solve the technical problems as described above, and an object of the present invention is to perform shredding capable of changing the rotational speed of the fan as needed while suppressing an increase in cost. It is to provide a processing apparatus and a method for controlling a fan.
Another object of the present invention is to provide a shredding processing device and a fan control method capable of suppressing the discharge of paper dust generated by shredding processing to the outside of the device.

For this purpose, the shredding device to which the present invention is applied is a shredding device that shreds input paper, and forcibly discharges the air in the shredding device outside the device. And a control means for controlling the rotation of the fan that realizes a rotational speed slower than the speed at which the fan rotates by continuous power feeding by intermittent power feeding.
Here, the intermittent power supply of the control means is excellent in that it can contribute to simplification of control if it is characterized in that the on time and the off time are substantially the same. Further, the intermittent power supply of the control means can be performed by setting the off time longer than the on time. Further, the intermittent power supply of the control means can be performed by setting the on time longer than the off time.

From another point of view, the shredding device to which the present invention is applied is a shredding device in which the paper to be shredded is loaded into the loading unit, and the paper is shredded by the driving force of the drive source in the processing unit. A ventilation unit that communicates the inside and outside of the shredding unit, and a fan that is provided in the ventilation unit and exhausts heat from the drive source from the ventilation unit and introduces outside air from the input unit. And a control means for controlling the rotation of the fan, which realizes a rotational speed slower than the speed at which the fan rotates by intermittent power feeding by intermittent power feeding.
Here, if the processing unit is further characterized by further including a partition unit for partitioning the processing unit from other parts in the shredding processing device, for example, it is possible to suppress discharge of paper dust in the device to the outside of the device. It is preferable in that it can be performed.

From another point of view, the shredding device to which the present invention is applied is a shredding device that shreds input paper by the driving force of a driving source, and the air in the shredding device is removed. It includes a fan for forcibly discharging to the outside of the apparatus, and control means for setting the rotation of the fan to at least high speed or low speed by controlling on / off of power supply to the fan.
Here, it further includes determination means for determining the amount of paper dust in the shredding device, and the control means sets the rotation of the fan at a low speed when the determination means determines that the amount of paper dust is large. This feature is excellent in that paper dust can be prevented from rising inside the apparatus and discharged from the apparatus. Moreover, if the determination means is a sensor that detects the temperature of the drive source, it is preferable in that the temperature sensor can detect a lack of exhaust heat due to paper dust clogging the filter.

  From another point of view, the fan control method to which the present invention is applied is a fan control method for discharging the air in the shredding device that shreds input paper out of the device. , Detecting the first state of the shredding device, rotating the fan at a first speed by continuous power supply or intermittent power supply, detecting the second state of the shredding device, and intermittently The fan is rotated at a second speed that is slower than the first speed by a periodic power supply.

  According to the present invention, it is possible to adjust the air volume by changing the rotational speed of the fan as necessary while suppressing an increase in cost.

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
FIG. 1 is a schematic configuration diagram showing a used paper processing apparatus according to the present embodiment. The used paper processing apparatus shown in FIG. 1 includes an upper surface part 1 constituting the upper part of the apparatus, and a loading unit 11 provided on the upper surface part 1 into which used paper to be discarded (paper to be shredded) is input. . Further, the used paper processing apparatus performs processing (such as shredding processing) of used paper that has been input into the input unit 11 of the upper surface 1 and temporarily stores processed used paper (hereinafter also referred to as chips) inside. 2 is provided. Further, the used paper processing apparatus includes an operation display unit 5 on the upper surface unit 1 for displaying instructions to the user regarding used paper processing and the like as well as giving instructions for used paper processing and the like in the main body unit 2. Yes. Further, the used paper processing apparatus is provided in the opening / closing door 25 that can be opened and closed when discharging the chip accommodated in the main body 2 to the outside of the apparatus, and is accommodated in the main body 2. A window 25a through which the amount of chips can be visually recognized and a caster 26 for enabling movement of the main body 2 are provided. A member 25b that transmits light is fitted in the window 25a.

FIG. 2 is a schematic configuration diagram showing the inside of the used paper processing apparatus. As shown in the figure, the main body 2 of the used paper processing apparatus includes a crushing unit 3 that crushes the used waste paper into chips, and a compression that compresses the chips formed by the crushing unit 3 into chunks. Unit 4 is provided. The main body 2 of the used paper processing apparatus includes a duct 21 as a transfer unit that transfers the lump of chips formed by the compression unit 4 and a box 22 as a storage unit that stores the lump of chips transferred by the duct 21. And.
The crushing unit 3 that generates paper dust in association with the shredding processing of used paper into chips and the compression unit 4 that compresses chips into chunks are separated from the surroundings by a partition plate 27. That is, the partition plate 27 is disposed so as to surround the crushing unit 3 and the compression unit 4. The partition plate 27 divides the paper powder generation source side where the crushing unit 3 and the compression unit 4 are located and the other surrounding space side. In this way, the paper dust generated by the crushing unit 3 or the like suppresses the paper dust from diffusing to the surrounding space side in the internal space of the used paper processing apparatus.

Further, the main body 2 of the used paper processing apparatus includes a fan 23 for forcibly forming an air flow inside the apparatus, a control unit 6 for controlling operations of the crushing unit 3 and the compression unit 4 (each unit), an external And a main power switch (main switch) 24 for a user to perform an ON / OFF operation for power supply from the power source. In addition, power supply from the outside is performed through a breaker 24a with an inlet.
A filter 23 a is provided adjacent to the fan 23. This filter 23a prevents paper dust or the like that has moved from the crushing unit 3 and the compression unit 4 to the outside of the partition plate 27 from leaking outside the apparatus when the air inside the apparatus is forcibly discharged by the fan 23. So-called dustproof filter.

  The crushing unit 3 includes a first rotating blade row 31A including a first rotating shaft 31A and a second rotating shaft 31B that are substantially parallel to each other, and a plurality of rotating blades 33A attached to the first rotating shaft 31A. The second rotary blade row 32B made up of a plurality of rotary blades 33B attached to the second rotary shaft 31B and the adjacent rotary blades 33A in the first rotary blade row 32A, and the used paper as the first The first pressing member 34A for pressing against the rotary blade row 32A and the second rotary blade row 32B are positioned between the adjacent rotary blades 33B, and the second paper for pressing the used paper against the second rotary blade row 32B. 2 pressing members 34B, and a crushing motor 36 as a drive source for the first rotary blade row 32A and the second rotary blade row 32B. Each rotary blade 33A, 33B is a circular plate-like member, and a plurality of blades extending outward are formed on the peripheral surface thereof.

Each of the rotary blades 33A and 33B constituting the first rotary blade row 32A and the second rotary blade row 32B is along the axial direction (perpendicular to the paper surface) of the first rotary shaft 31A and the second rotary shaft 31B. Are arranged at predetermined intervals. The mutual positional relationship between the first rotary blade row 32A and the second rotary blade row 32B is such that the rotary blade of one rotary blade row is located between adjacent rotary blades of the other rotary blade row. It is like that. That is, the rotary blade 33A of the first rotary blade row 32A and the rotary blade 33B of the second rotary blade row 32B are arranged so as to be staggered with respect to the axial directions of the first rotary shaft 31A and the second rotary shaft 31B. Has been. The mutual positional relationship between the first rotary blade row 32A and the second rotary blade row 32B is such that the rotary blades of one rotary blade row enter between adjacent rotary blades of the other rotary blade row. It has become.
A meshing portion 35 that is an overlapping region is formed by the rotating blades 33A and 33B that are alternately arranged and intruded.

The crushing motor 36 is controlled by the control unit 6. The driving force generated by the crushing motor 36 is transmitted to the first rotating shaft 31A and the second rotating shaft 31B via a drive transmission system (for example, a driving belt) (not shown). When the driving force is transmitted to the first rotary shaft 31A and the second rotary shaft 31B, the first rotary blade row 32A and the second rotary blade row 32B rotate.
Here, the rotation direction of the first rotary blade row 32A and the rotation direction of the second rotary blade row 32B are opposite to each other. That is, one rotating blade row rotates clockwise, and the other rotating blade row rotates counterclockwise. Specifically, normally (at the time of forward rotation), as shown in FIG. 2, the first rotary blade row 32A rotates in the clockwise direction, and the second rotary blade row 32B rotates in the counterclockwise direction. Thereby, the meshing side 35a of the meshing portion 35 is positioned below the position of the rotation shafts 31A and 31B, and the counter meshing side 35b of the meshing portion 35 is positioned above the positions of the rotation shafts 31A and 31B. Further, the crushing motor 36 can be reversed in the forward and reverse directions, and can rotate the first rotary blade row 32A and the second rotary blade row 32B in the direction opposite to the arrow direction in FIG. is there. In that case, the meshing side 35a and the non-meshing side 35b of the meshing portion 35 are in opposite positions.
Further, the rotation speed (circumferential speed) of the first rotary blade row 32A and the rotation speed of the second rotary blade row 32B are different from each other. That is, the first rotating blade row 32A located on the used paper input side rotates slowly (low speed), and the second rotating blade row 32B located on the side opposite to the used paper input side rotates fast (high speed). As the speed difference, for example, a double value can be adopted.

A compression unit 4 is provided below the crushing unit 3. The compression unit 4 includes a hopper 41 that receives chips falling from the crushing unit 3, a cylindrical member 42 to which chips received by the hopper 41 are continuously supplied, and a cylindrical member 42 that is rotatable. The screw 43 arranged and a compression motor 44 as a drive source of the screw 43 are provided.
The screw 43 is configured by attaching a helical screw piece 43b to the rotating shaft 43a so as to extend along the axial direction of the rotating shaft 43a supported in the cylindrical member 42. That is, the screw 43 moves in one direction to move (push out) the chips continuously supplied from the hopper 41 into the cylindrical member 42. The lower end portion 42b of the cylindrical member 42 has a diaphragm shape with an aperture diameter narrower than that of the upper end portion 42a. With this drawing shape, the chip can be compressed at the lower end portion 42b into a lump of chips.
The compression motor 44 is controlled by the control unit 6. The driving force generated by the compression motor 44 is transmitted to the screw 43 through a drive transmission system (not shown). The screw 43 rotates in a direction to push the chip downward.
Here, the range in the circumferential direction of the screw piece 43b is set to be 360 degrees or less around the rotation shaft 43a so that the tip can smoothly advance in the cylindrical member 42 by the pressing force of the screw 43. Further, in order to prevent a co-rotation phenomenon in which the lump of the chip rotates in the same manner as the screw 43 rotates and does not move forward, a plurality of small protrusions (not shown) extending in the length direction are formed on the inner surface of the cylindrical member 42. The part is formed over the entire circumference.

Subsequent to the compression unit 4, a duct 21 and a box 22 are provided in the main body 2 of the used paper processing apparatus. The duct 21 is connected to the downstream end 42 c of the cylindrical member 42 of the compression unit 4. And the special drive source for transferring the lump of chips in the duct 21 is not necessarily required. That is, the lump of chips in the duct 21 is transferred using the pressing force of the screw 43 of the compression unit 4.
The box 22 is arranged to receive a lump of chips that have been transported through the duct 21 and discharged from the duct 21. The box 22 can be removed from the main body 2 by opening the door 25.

  Various sensors (detection units) are attached to the main body 2 of the used paper processing apparatus. That is, in the main body 2 of the used paper processing apparatus, a paper sensor (paper sensor) 90 that detects that used paper has been input into the input unit 11 and chips that have fallen from the crushing unit 3 are contained in the hopper 41 of the compression unit 4. A hopper full detection sensor 92 for detecting that the battery is full is attached. Further, in the main body 2 of the used paper processing apparatus, the box set sensor 94 for detecting that the box 22 is set inside the main body 2 and the chip in the box 22 have reached a position almost full. A near full sensor 96 for detecting the door and a door sensor (door interlock switch) 98 for detecting that the door 25 is closed and locked are attached. The detection results of these various sensors 90, 92, 94, 96, 98 are output to the control unit 6.

Here, when the main power switch 24 of the main body 2 of the used paper processing apparatus is operated from OFF to ON, a predetermined initialization process is started by the control unit 6 that detects the operation (initialized state). Thereafter, the status of the used paper processing apparatus is managed by the control unit 6, and the status of the used paper processing apparatus is displayed on the operation display unit 5.
As the state of the used paper processing apparatus, there are a stopped state, a standby (standby) state, a processing state, a power saving state, an error occurrence state, and a system error state in addition to the above-described initialized state. Hereinafter, each state will be briefly described.
That is, when the predetermined initialization process is completed, the used paper processing apparatus is stopped. When a start switch (not shown) is pressed in the stop state, the state shifts to a standby state. When the paper sensor 90 detects that the used paper has been input to the input unit 11, the process shifts to the processing state, and the crushing unit 3 is activated to start the processing of the used paper (the shredding process) (auto start). When the waste paper processing is completed, the processing state returns to the standby state (auto stop).

If the operation is not performed even after a predetermined time has passed since the transition to the stop state, the state shifts to the power saving state to save power and waits for a start button (not shown) to be pressed.
When the door sensor 98 detects that the opening / closing door 25 has been opened in the processing state, an error occurs, and the processing of used paper is immediately stopped. Note that an emergency stop button (push button switch) 51 constituting a part of the operation display unit 5 of the used paper processing apparatus is provided on the upper surface portion 1, and when the emergency stop button 51 is pressed in the processing state, It is forcibly stopped and an error occurs. When the control unit 6 determines that a paper jam has occurred, a predetermined paper jam process is performed.
Further, for example, when it becomes a situation that cannot be dealt with unless customer service is called such that the paper jam cannot be cleared even by a predetermined paper jam processing, a system error state occurs.

Here, as other states of the used paper processing apparatus, there are an administrator mode for users including the user and a maintenance DIAG mode for maintenance of the used paper processing apparatus.
Further, when a start button (not shown) is kept pressed for a predetermined time in the standby state, the mode shifts to the manual mode. In this manual mode, waste paper processing is continued while a start button (not shown) is pressed. The fan 23 is operated as necessary by the control unit 6.

Next, specific processing contents of the used paper processing apparatus will be described. When the paper sensor 90 detects that waste paper has been input into the input unit 11 in the standby state, the crushing motor 36 and the compression motor 44 are operated according to instructions from the control unit 6.
Since the used waste paper is pressed against the first rotary blade row 32A (low speed side) by the first pressing member 34A, it is caught by the rotary blade 33A of the first rotary blade row 32A. For this reason, when the first rotary blade row 32A and the second rotary blade row 32B of the crushing unit 3 rotate, the used paper hooked on the rotary blade 32A of the first rotary blade row 32A becomes the first rotary blade row. While being wound around 32A, it is drawn into the inside one by one. Then, the waste paper hooked on the first rotary blade row 32A at the meshing portion 35 is peeled off and crushed by the second rotary blade row 32B.
The fine waste paper becomes chips and falls to the compression unit 4 that performs the next process (compression process). Large waste paper is crushed again by the meshing portion 35, and the waste paper that has not been finely crushed still repeats the passage of the meshing portion 35 until it becomes fine. In this manner, the used paper processing apparatus first cuts the used used paper into chips by cutting the input used paper at a speed difference between the first rotating blade row 32A and the second rotating blade row 32B (chopping processing).
Note that almost all used paper wound around the first rotary blade row 32A is peeled off by the second rotary blade row 32B and moved to the second rotary blade row 32B. For this reason, the rotary blade 33A of the first rotary blade row 32A is always exposed without being filled with waste paper, and the function of the first rotary blade row 32A to hook the waste paper is maintained.

  Chips formed by crushing waste paper by the crushing unit 3 fall into the hopper 41 of the compression unit 4 and enter the cylindrical member 42 from the upper end portion 42 a of the cylindrical member 42. In the cylindrical member 42, the chip is pushed toward the lower end portion 42 b of the cylindrical member 42 by the screw 43 rotating by the driving force of the compression motor 44. On the other hand, since the lower end portion 42 b of the cylindrical member 42 has a diaphragm shape, the chip receives a predetermined resistance force when passing through the cylindrical member 42. In this way, the chip is compressed by the pressing force of the screw 43 in the cylindrical member 42, and is eventually pushed out from the cylindrical member 42 as a lump of chips.

The lump of chips formed by the compression unit 4 is transferred through the duct 21 by the pressing force of the screw 43. Since the downstream end 21 a of the duct 21 is located above the box 22, the chip lump is discharged into the box 22 when pushed out of the duct 21.
Chips in the box 22 are opened and opened from the main body 2 together with the box 22 and collected. Note that the recovered chips can be easily recycled because the paper fibers are not cut. In addition, since the collected chip is a waste paper that is irregularly and irregularly crushed, high confidentiality can be maintained.

Next, the fan 23 will be described with reference to FIGS.
FIG. 3 is a configuration diagram illustrating the fan 23 and a configuration for controlling the fan 23.
The fan 23 shown in FIG. 3 includes a drive motor (not shown) of a constant speed rotation type that rotates the fan 23 at a constant speed by feeding a constant voltage. The operation of the fan 23 is controlled by a CPU (Central Processing Unit) 61 that constitutes a part of the control unit 6. Various information signals are input to the CPU 61. The information relating to the present invention includes a timer signal, a temperature sensor signal, a signal from the paper sensor 90, a power saving state (energy saving mode) signal, JAM. For example, the signal of the release switch can be input.
The timer signal is a signal related to the elapsed time, and the temperature sensor signal is a signal from a temperature sensor (not shown) attached to each of the crushing motor 36 and the compression motor 44. Although the description is repeated, the signal from the paper sensor 90 is a signal issued by the paper sensor 90 for determining that the used paper has been input to the input unit 11, and the power saving state signal is for power saving. This is a signal for acquiring information automatically switched from the stop state to the power saving state.

The JAM release switch signal is a signal generated when a user presses a paper jam handling button (not shown) when a paper jam occurs during shredding. When a paper jam button (not shown) is pressed, a predetermined series of paper jam processing is performed. That is, the crushing motor 36 of the crushing unit 3 is set to one cycle of normal rotation, reverse rotation, normal rotation and reverse rotation, and when a paper jam processing button (not shown) is pressed once, one cycle of paper jam processing is performed. When the paper jam processing is completed, the forward rotation operation is executed once to check whether or not the paper jam has been eliminated. When it is confirmed that the paper jam has been cleared, the printer returns to the standby state.
When the control unit 6 detects that the supply current to the crushing motor 36 is 120% (eg, 3A) of the rated current (eg, 2.5A), a paper jam has occurred during the shredding process. Can be detected. When the occurrence of a paper jam is detected during the shredding process, the crushing motor 36 is immediately stopped and the operation display unit 5 displays that a paper jam has occurred. When the paper jam occurs during the shredding process, the compression motor 44 is controlled in the same manner as in the normal stop state.

  As shown in FIG. 3, an npn transistor 62 is connected between the CPU 61 and the fan 23. In the transistor 62, the emitter E is grounded, the base B is connected to the CPU 61, and the collector C is connected to the fan 23. Then, ON / OFF of a large collector current can be controlled by ON / OFF of a slight base current. Using such a switching action of the transistor 62, ON / OFF control of the fan 23 is performed according to an instruction from the CPU 61.

FIG. 4 is a time chart showing the driving status of the fan 23, and is a diagram showing the relationship between the operation of the driving motor of the fan 23 and the air volume of the fan 23.
As shown in FIG. 4, the fan 23 is controlled by the CPU 61 to perform two-speed control of normal rotation (full speed operation, continuous operation, high speed rotation) and low speed rotation (intermittent operation). That is, the normal rotation operation is realized by continuously turning on the fan 23, and the low-speed rotation operation is realized by intermittent ON pulse output from the CPU 61.
More specifically, the low-speed rotation operation repeats ON and OFF every 100 ms, for example. Thus, for example, in the case of the fan 23 that rotates at a constant speed of 3800 rpm (revolution per minute), the rotational speed can be reduced from about 3800 rpm to about 2000 rpm to reduce the air volume. Thereby, reduction of noise, suppression of power consumption, and prevention of increase in internal temperature can be realized. Further, the ON / OFF control every 100 ms allows the fan 23 to rotate smoothly without jerking. That is, the fan 23 rotates stably. Naturally, it is considered that a value different from 100 ms is adopted depending on the specifications of the fan 23 to be used.
As described above, the fan 23 used in the present embodiment is a constant-speed fan that rotates at a constant speed by feeding a constant voltage. However, the rotation speed is normal rotation by continuous ON and intermittent ON / OFF control. The second speed (multi-stage), which is a low speed rotation that does not increase the speed, can be selected.

In the case of low speed rotation, the ON time and the OFF time are the same time. That is, it is a low rotation type and releases heat with a constant air volume. Thereby, rotation unevenness does not occur and the control program can be prevented from becoming complicated. Furthermore, the capacity of an NVM (nonvolatile memory) constituting a part of the control unit 6 can be reduced, and access to the NVM can be reduced, so that the processing speed can be increased.
In this embodiment, the ON time and the OFF time are substantially the same, but it is also conceivable to make the ON time and the OFF time different from each other. For example, the ON time is set to 100 ms and the OFF time is set to 200 ms, or the ON time is set to 200 ms and the OFF time is set to 100 ms. In the former case, setting the OFF time longer is excellent in that the heat accumulated in the upper part of the apparatus can be released by the fast initial rotation, and the subsequent rise of paper dust can be prevented. In the latter case, noise is reduced as compared with the full speed by continuous energization, and power saving operation can be performed as compared with the full speed. Further, it is excellent in that heat can be discharged outside the apparatus while performing power saving operation when the temperature inside the apparatus becomes high. These values are merely examples, and the specific time is individually determined according to the fan specifications. In addition, when it is desired to obtain a smooth rotation at a constant speed using a fan that rises slowly, it is conceivable to set the ON time to 200 ms and the OFF time to 50 ms. Actually, the ON / OFF value may be set according to the operation specification of the fan.
In this embodiment, the ON time and the OFF time are fixed to a value of 100 ms, but may be variable. That is, a paper dust detection means (paper dust sensor) (not shown) is provided inside the apparatus, and the rotation speed is controlled to an optimum value by changing the ON time and the OFF time based on the detection result of the paper dust sensor. Is also possible.

Various configurations of the above-described paper dust sensor are conceivable. For example, a configuration in which the amount of paper dust is estimated based on the temperature inside the apparatus can be employed. That is, as the amount of paper dust increases, the clogging of the filter 23a increases. When the filter 23a becomes clogged, the exhaust heat efficiency is lowered even if the fan 23 is turned, and the temperature inside the apparatus becomes higher than that in a normal case. Therefore, the amount of paper dust can be estimated by detecting the temperature inside the apparatus.
In addition, considering that the airflow by the fan 23 decreases when the filter 23a becomes clogged, it is conceivable to provide an airflow sensor (not shown) that detects the airflow inside the apparatus. In addition, it is conceivable to provide a transmission sensor (not shown) that directly detects the degree of clogging of the filter 23a.
The rotation speed of the fan 23 is detected when a large amount of paper dust is detected by the paper dust sensor in addition to the case where the detection result of the paper dust sensor (not shown) is used to change the ON time and the OFF time of the fan 23. It is also conceivable to control so as to reduce the air volume by lowering the air pressure.

Here, heat is generated from the crushing motor 36 and the compression motor 44 by waste paper shredding. In order to suppress an increase in internal temperature due to this heat, the fan 23 is operated when the crushing motor 36 and the compression motor 44 are operating, and the heat is quickly exhausted outside the apparatus.
On the other hand, even when the crushing motor 36 and the compression motor 44 are not operating, if the fan 23 is operated and the air inside the device is discharged through the filter 23a, the inside of the device is decompressed. Air outside the apparatus flows from the portion 11 and the opening / closing door 25. By forming such an air flow, it is possible to suppress paper dust inside the apparatus from leaking out of the apparatus, for example, from the input unit 11 or the opening / closing door 25. That is, when the rotary blades 33A and 33B (see FIG. 2) of the crushing unit 3 are rotated, the amount of paper powder increases due to the rotational action of the rotary blades 33A and 33B and the air flow, and the paper powder is ejected from the input unit 11. There is a risk of coming. According to the present embodiment, it is possible to form an air flow that suppresses the ejection of the paper powder.
In order to suppress such leakage of paper dust, a smaller air volume is sufficient than when heat is discharged from the crushing motor 36 or the like. On the contrary, if it is the same as the air volume for exhaust heat, an unpreferable situation is assumed. That is, if the fan 23 is operated at a high speed so that the paper dust rises inside the apparatus, the air volume increases so that the paper powder rises, and the paper powder comes out of the apparatus from the input unit 11 and the opening / closing door 25 and the like. The situation that it ends up is considered. In addition, the filter 23a may be clogged unnecessarily, and the replacement time of the filter 23a may be advanced. For this reason, it is necessary to rotate the fan 23 at low speed so that the air volume is such that paper dust does not rise.
In the present embodiment, a constant speed fan is used, but a control unit 6 is provided for switching control between a case where the constant speed fan is normally rotated and a case where the constant speed fan is rotated slower than that. Therefore, it is possible to realize a function that can change the air volume in two stages while using a constant speed fan that is cheaper than the variable speed fan as the fan 23. Therefore, it is possible to easily reduce the cost.

As a case of causing the fan 23 to perform a normal rotation operation, a shredding process state, a JAM occurrence, or a motor overheat alarm can be considered. In addition, a case where the low-speed rotation operation is performed is a state other than that, for example, a standby state.
For example, when it is determined from the temperature sensor signal that the temperature of the crushing motor 36 or the compression motor 44 exceeds a predetermined temperature, for example, 50 ° C., normal rotation is started. Further, when it is determined from a JAM release switch signal that a paper jam handling button (not shown) has been pressed by the user, normal rotation is started. Furthermore, when it is determined from the power saving state signal that the power saving state has been switched, the low speed rotation is switched.
When the emergency stop button 51 is pressed, both the crushing motor 36 and the compression motor 44 are immediately stopped. However, the fan 23 does not stop immediately but continues to normally rotate for 5 minutes based on the timer signal, and then stops. By the operation for 5 minutes, the internal temperature rise by the crushing motor 36 and the compression motor 44 is suppressed.
Further, after shifting to the power saving state, the motor continues to rotate at a low speed for 5 minutes based on the timer signal and then stops.
In addition, by controlling the fan 23 as described above, the temperature inside the apparatus can be maintained within a predetermined range. The waste paper chips crushed by the crushing unit 3 are compressed by the compression unit 4 so that the chips become lumps. There are conditions (temperature, humidity) necessary to form the mass. Therefore, by keeping the temperature in the apparatus within a predetermined range, not only the temperature but also the humidity can be kept within the predetermined range.

Although the present embodiment has been described above, various modifications can be considered. For example, the surrounding space side delimited by the partition plate 27 (the side opposite to the paper dust generation source side where the crushing unit 3 and the compression unit 4 of the two spaces delimited by the partition plate 27 are located) is further moved up and down. It is also conceivable to provide a partition plate (not shown) for partitioning in two stages. The partition plate (not shown) extends in a substantially horizontal direction, and it is preferable that a device for generating heat, that is, a crushing motor 36 and a compression motor 44 be positioned above the partition plate (not shown). . Naturally, the fan 23 is also located above the partition plate (not shown). By adopting such a configuration, air outside the apparatus mainly flows from the charging unit 11, and efficient exhaust heat by the fan 23 can be performed.
Further, for example, when it is detected that the filter 23a is clogged, it can be displayed on the operation display unit 5 to notify the user that the filter 23a needs to be replaced or cleaned.
Moreover, as the filter 23a, it is preferable to use a detachable filter that replaces the filter 23a together with a member that holds the filter 23a. It is also conceivable to use a take-up sheet-like filter 23a. That is, the part of the clogged filter 23 a is wound up so that a new part of the filter 23 a appears in the ventilation area of the fan 23.
Further, when the clogging of the filter 23a is detected, it is conceivable to perform control such that the fan 23 is rotated in the reverse direction to remove paper dust and the like from the filter 23a.

It is a schematic block diagram which shows the used paper processing apparatus which concerns on this Embodiment. It is a schematic block diagram which shows the inside of a used paper processing apparatus. It is the block diagram which illustrated the structure for controlling a fan and a fan. It is a time chart which shows the drive condition of a fan.

Explanation of symbols

23 ... Fan, 23a ... Filter, 27 ... Partition plate, 6 ... Control unit, 61 ... CPU, 62 ... Transistor

Claims (10)

A shredding device that shreds input paper,
A fan for forcibly discharging the air in the shredding device out of the device;
A shredding device comprising: a control means for controlling the rotation of the fan, which realizes a rotational speed slower than the speed at which the fan rotates by continuous power feeding by intermittent power feeding.   2. The shredding device according to claim 1, wherein the intermittent power supply of the control means is performed with the on time and the off time being substantially the same.   2. The shredding device according to claim 1, wherein the intermittent power supply of the control means is performed with an off time longer than an on time.   The shredding device according to claim 1, wherein the intermittent power supply of the control means is performed with an on time longer than an off time. A shredding device in which a sheet to be shredded is loaded into a loading unit, and the sheet is shredded by a driving force of a driving source in the processing unit,
A ventilation portion communicating between the inside and outside of the shredding device;
A fan provided in the ventilation part, for discharging heat of the drive source from the ventilation part and introducing outside air from the input part;
A shredding device comprising: a control means for controlling the rotation of the fan, which realizes a rotational speed slower than the speed at which the fan rotates by continuous power feeding by intermittent power feeding.   6. The shredding device according to claim 5, further comprising a partition for partitioning the processing unit from other parts in the shredding device. A shredding device that shreds input paper with the driving force of a drive source,
A fan for forcibly discharging the air in the shredding device out of the device;
A shredding processing device comprising: control means for setting the rotation of the fan to at least one of a high speed and a low speed by performing on / off control of power supply to the fan. A judgment means for judging the amount of paper dust in the shredding device;
The shredding device according to claim 7, wherein the control unit sets the rotation of the fan to a low speed when the determination unit determines that the amount of paper dust is large.   9. The shredding device according to claim 8, wherein the determination unit is a sensor that detects a temperature of a drive source. A fan control method for discharging air in a shredding device that shreds input paper out of the device,
Detecting a first state of the shredding device, rotating the fan at a first speed by continuous power supply or intermittent power supply,
A fan control method comprising: detecting a second state of the shredding device; and rotating the fan at a second speed slower than the first speed by intermittent power feeding.

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