JPH01299646A - Document shredder - Google Patents

Abstract

PURPOSE:To reduce the downtime of the title shredder and to increase its efficiency by setting the control temp. of a temp. detector for a shredding motor in two stages, stopping the motor at the first high set temp., driving a cooler, and forcedly cooling the motor to the second set temp. CONSTITUTION:When the shredding motor 2 is overloaded due to the shredding for a long time and the motor 2 is heated, the heat is transmitted to the first and second protective switches 10 and 11. When the temp. is increased above the higher set temp. of the first protective switch 10, a fan motor switch 16 is turned on, hence a fan motor 3b is operated, and the shredding motor 2 is cooled. At this time, the closed contact of a shredding motor switch 14 is turned off, and the motor 2 is stopped. When the motor 2 is cooled below the set temp. of the second protective switch 11 as the initial temp., the fan motor 3b is stopped, a source voltage is impressed on the motor 2, and rotation is resumed.

Description

[Detailed Description of the Invention] <Industrial Field of Application> The present invention provides document shredding* (rotary blade type and fixed blade type) equipped with a protection device that stops the shredding motor when overheating of the shredding motor is detected. (including formulas).

Conventional technology> The conventional document #I shredding includes a shredding blade that shreds the shredded paper;
and a shredding motor that drives the shredding blade. In this case, if the shredding motor continues to shred for a long time beyond its capacity, or if the shredding motor stops rotating due to an excessive load that far exceeds the shredding motor's capacity, A protection device is provided to prevent burnout due to overheating of the shredding motor, and a protection switch serving as the protection device detects overheating of the shredding motor and cuts off power to the shredding motor.

Therefore, once the protection device is activated, the shredding motor will not start until the temperature drops, and it will take a considerable amount of time before shredding becomes possible again, resulting in problems such as reduced shredding efficiency. there were.

<Prior application technology> Therefore, Utility Application No. 63-2264, which was filed earlier by the present applicant.
We proposed the technology shown in No. 7 (hereinafter referred to as the prior art).

This includes a shredding device that shreds shredded paper, a shredding motor that drives the shredding device, and a shredding motor protection device that stops the shredding motor when overheating of the shredding motor is detected. A shredding motor cooling device that is driven when the protective device is operated is provided. In this embodiment, the protective device is constituted by a double-throw switch, and the shredding motor is connected to the normally closed contact side of the protective device. A configuration is disclosed in which the cooling device is connected to the normally open contact side.

<Problem to be solved by the invention> In the above-mentioned technique H, even if the protective device is restored, the temperature at which it returns is itself high, so even if the shredding operation is performed again, the protective device will not be activated again immediately. There was a problem with it working.

In view of the above, an object of the present invention is to provide a document shredding machine that can shorten the interruption of shredding work due to overheating of the shredding motor, prevent immediate re-interruption, and improve shredding efficiency. do.

<Means for solving the problem> The problem solving means according to the present invention, as shown in FIGS. A shredding motor 2, a shredding motor cooling device 3 that cools the shredding motor 2, and a control device 4 that controls driving of the shredding motor 2 and the shredding motor cooling device 3 are provided,
The control device 4 includes a temperature detector 5 that detects a first set temperature of the shredding motor 2 during heating and a second set temperature lower than the first set temperature, and a temperature detector 5 that detects a first set temperature of the shredding motor 2 when heating and a second set temperature that is lower than the first set temperature. A shredding motor control means 4a that stops when the temperature reaches the first set temperature and starts when the temperature falls below a second set temperature, and a second setting that starts the shredding motor cooling device 3 when the temperature reaches the first set temperature. Cooling device control means 4 that stops when the temperature drops below
b.

In the above problem solving means, if shredding is performed for a long time beyond the capacity of the shredding motor 2, or if an excessive load far exceeding the shredding motor 2's capacity is applied, the shredding motor 2 may not rotate. If the shredding motor 2 stops, the temperature of the shredding motor 2 may rise and overheat. To prevent this, the control device 4 operates to stop the shredding motor 2 and simultaneously drive the cooling device 3.

Then, the shredding motor 2 is forcibly cooled down to the set temperature for overheating protection (a second set temperature that is even lower than the #1 general set temperature. Therefore, after the control device 4 operates, the shredding motor 2 The time it takes to restart can be shortened, and since the shredding motor 2 is cooled to a temperature close to its initial state, the time it takes for the control device 4 to operate again can be reduced, and shredding efficiency can be improved. .

<Example> Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4. FIG. 1 is an electric circuit diagram showing an embodiment of the document shredding machine of the present invention, FIG. 2 is a plan view, FIG. 3 is a perspective view, and FIG. 4 is a functional block diagram of the control device.

As shown in the figure, the document shredding machine of the present invention includes a shredding device 1 for shredding shredded paper, a shredding motor 2 for driving the shredding device, and a shredding motor 2 for cooling the shredding motor 2. A shredding motor cooling device 3 and a control device 4 for controlling the driving of the shredding motor 2 and the shredding motor cooling device 3 are provided.
includes a temperature detector 5 for detecting a first set temperature when heating the shredding motor 2 and a second set temperature lower than the first set temperature; a shredding motor control means 4&, which stops when the temperature drops and starts when the temperature drops below a second set temperature; and the shredding motor cooling device 3.
The cooling device control means 4b is configured to operate the cooling device when the temperature reaches the first set temperature and to stop the cooling device when the temperature falls below the second set temperature.

The shredding device 1 is a pair of roller-type shredding blades, and includes a driving shredding blade 1a and a driven shredding blade 1b.

The shredding motor 2 is a fundensalan type alternating current electric rock, and is configured to be capable of forward and reverse rotation by switching the contacts of a reverse switch 7.

The cooling device 3 includes a blower 7-an 3a arranged opposite to the shredding motor 2, and a 7-an motor 3b that drives the blower 7-an 3a. Further, a large number of ventilation holes 9 are formed on both sides of the main body outer wall 8.

The temperature detector 5 of the control device 4 includes a first protection switch 10 that detects a first temperature setting, and a second protection switch 11 that detects a second temperature setting.

The first protection switch 10 has a common terminal 10c connected to a power source 18.
The first protection switch 10 is a double-throw type switch connected to the side, and is made of bimetal or the like, and is arranged close to (including in contact with) the shredding motor 2. If the temperature is less than the first set temperature, the normally closed contact 10a side is turned on, and if the temperature is higher than the first set temperature (for example, 130° C.), the normally open contact 10b side is set to be turned on.

Further, the second protection switch 11 has a common terminal
is a double-throw switch connected to the normally open contact 10b of the first protection switch 10, and is made of bimetal or the like, and is placed close to (including in contact with) the shredding motor 2, and its temperature is controlled. If the temperature is lower than the second set temperature, the normally closed contact 11a
side is turned on, and if the temperature is higher than the second set temperature, normally open contact 1
The 1b side is turned on.

The control device 4 is comprised of a three-pole, double-throw relay 12 and a second protection switch 11 that connects the first protection switch 10 and the second protection switch 11 . The relay 12 has a relay coil 13
, a double-throw shredding motor switch 14 and a coil switch 15, and a normally open contact 77mm motor switch 16.
It consists of

The normally closed contact 10a of the first protection switch 10 is connected to the shredding motor 2 via the common terminal 14c of the shredding motor switch 14, and the normally open contact 10b is connected to the coil 13.

The normally open contact tilt of the second protection switch 11 is connected to the common terminal 15c of the coil switch 15, and the normally open contact 15b of the coil switch 15 is connected to the common terminal 10c of the first protection switch 10. Further, the common terminal 11c of the second protection switch 11 is connected to the normally open contact 10b of the first protection switch 10. Note that the normally closed contact 11a of the second protection switch 11 and the shredding motor switch 14
The normally open contact 14b of the fill switch 1.5 and the normally closed contact 15a of the fill switch 1.5 are not connected. Further, the fan motor 3b
is connected to the normally open contact 11b side of the second protection switch 11.

The shredding motor control means 4a is composed of a first protection switch 10, a second protection switch 11, and a relay 12.

Further, the cooling device control means 4b includes a first protection switch 10
, a second protection switch 11, a relay 12, a l/77 motor switch 16, etc.

Note that Figure 1 is a circuit diagram showing the state before power is turned on.
1 is a power switch, and 18 is a commercial AC power source. Further, in FIG. 2, 19 is a shredding blade support body that rotatably supports the shredding blade 1, and 20a and 20b are gears that transmit the driving force of the driving shredding blade 1a to the driven shredding blade 1b. 21 is a belt for transmitting the driving force of the shredding motor 2 to the shredding blade 1 via pulleys 22a and 22b, and 23 is a gear box of the shredding motor 2.

In the above configuration, when the power switch 17 is turned on under normal conditions, the first protection switch 10 is switched to the normally closed contact 10a side, so that the shredding motor 2 is supplied with the voltage of the commercial power supply voltage A18. 2 starts rotating.

However, if the shredding exceeds the capacity of the shredding motor 2 for an extended period of time, or if an excessive load that exceeds the shredding motor 2's capacity causes the shredding motor 2 to stop rotating, Motor 2 overheats. This heat is transferred to the first protection switch 10
is transmitted to the second protection switch 11, and the first protection switch 1
When the temperature exceeds the set temperature of the second protection switch 11 (for example, 80° C.), which is always lower than the set temperature of 0, the bimetal etc. are deformed and the normally open contact 11b side thereof is turned on. Further, when the temperature reaches the first set temperature (for example, 130° C.) of the first protection switch 10 or higher, the bimetal etc. are deformed, the first protection switch 10 is operated, and its normally open contact 10b side is turned on.

Then, the coil 13 of the relay 12 is excited, and the normally open contact 15b of the coil switch 15 and the motor switch 16 are turned on. Then, the voltage of the commercial AC power supply 9 is applied to the unmotor 3b to start operation, and the shredding motor 2 is cooled. At this time, the shredding motor switch 14
Since the normally closed contact 14a is turned off, the shredding motor 2 stops.

When the temperature of the shredding motor 2 falls below the set temperature (80°C to 100°C) of the first protection switch 10, the protection switch 10
is restored, and the normally closed contact 10a side is turned on. but,
The relay 12 includes a common contact 10 of the first protection switch 10.
Normally open contact 15 of coil switch 15 connected to c
b to its common terminal 15c and the second protection switch 11
Since power is supplied through the normally open contact 11b and the common terminal 11c, the relay 12 remains energized.

Then, the set temperature of the second protection switch 11 (50 to 60
℃), the second protection switch 11 is reset and the normally closed contact 11a is turned on, so the coil 13 is no longer excited, and the movement of the contact stops the 77mm motor 3b, and the shredding motor 2 The voltage of the commercial AC power supply 18 is applied to restart the rotation.

In other words, when the shredding motor 2 is stopped by the control device 4 that controls the shredding motor 2 and the shredding motor 3b, the blower 7
7n 3a automatically starts operating and cools the shredding motor 2 to the temperature set by the second protection switch 11, so the temperature of the shredding motor 2 can be rapidly lowered, and the shredding motor 2 It can shorten the interruption time of shredding work due to overheating. Furthermore, since the shredding motor 2 is quickly cooled down to a temperature close to its initial temperature, the time required for the control device 4 to operate again can be lengthened, and shredding efficiency can be improved.

Next, a second embodiment of the present invention will be described based on the perspective view of FIG.

In this embodiment, the shredding device 1 is of a fixed blade type, and includes a plurality of fixed blades 24, a driving conveyance roller 25, a driven conveyance roller 26, and the like. □A blower fan serving as a cooling device 3 is placed on the side of the shredding motor 2.

In the figure, 25a and 26a are the rotating shafts of the respective conveyance rollers 25 and 26, 25b and 26bi are circumferential grooves provided on the respective conveyance rollers 25 and 26, and 27a and 27b are the driving force of the driving conveyance roller 25 to the driven conveyance roller 26. Transmitting gear, 28a-2
8d is a wheel support that rotatably supports the rotating shafts 25a and 25b, 29 is a support for the fixed blade 24, and 30 is a main body.

The other configurations are the same as in the first embodiment, and the same functional parts are given the same numbers.

In the above configuration, the shredded paper transported by the transport rollers 25 and 26 is shredded by the shredding device 1 to become shredded waste.

At this time, as in the first embodiment, if the shredding is performed for a long time beyond the capacity of the shredding motor 2, or if an excessive load that far exceeds the capacity of the shredding motor 2 is applied, the shredding motor 2 If the rotation of the shredding motor 2 stops, the shredding motor 2 will overheat. Then, the control device 4 operates to stop the shredding motor 2, and at the same time, the cooling device 4 is driven to forcibly cool the shredding motor 2 to the second set temperature of the temperature detector 5. Therefore, the time from when the shredding motor 2 stops to when it restarts can be shortened, and moreover, it can be cooled to a temperature close to the initial one in a short time, and it takes a long time for the shredding motor 2 to heat up and stop again.
Shredding efficiency can be improved.

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

For example, the air blower 77 3a may be arranged close to the ventilation hole 9, and furthermore, a device using another cooling method (water cooling, etc.) may be used as the cooling device 3.

<Effects of the Invention> As is clear from the above description, according to the present invention, a shredding device that shreds shredded paper, a shredding motor that drives the shredding device, and a shredding motor that cools the shredding motor are provided. A shredding motor cooling device and a control device for controlling the driving of the shredding motor and the shredding motor cooling device are provided, and when the temperature of the shredding motor increases, the control device stops the shredding motor;
At the same time, the cooling device is driven and the shredding motor is forcibly cooled down to the second set temperature, which is lower than the first set temperature. The cutting efficiency can be improved.

Additionally, since the shredding motor is cooled to a temperature close to its initial temperature, it takes longer for the shredding motor to restart and heat up again, causing the control device to operate, increasing shredding efficiency. It has excellent effects such as being able to

[Brief explanation of the drawing]

FIG. 1 is an electrical x circuit diagram showing a first embodiment of the document shredding machine of the present invention, FIG. 2 is a plan view, FIG. 3 is a perspective view, and FIG. 4 is a functional block diagram of the control device. FIG. 5 is a perspective view showing a second embodiment of the document shredding machine of the present invention. DESCRIPTION OF SYMBOLS 1: Shredding device, 2: Shredding motor, 3: Shredding motor cooling device, 3a: Air blower 77 fans, 3b Near motor, 4: Control device, 4a: Shredding motor control means, 4b: Cooling device control means, 5 : Temperature detector, 7: Reversing switch, 8: Main body outer wall, 9: Ventilation hole, 10: First protection switch, 11: Second protection switch, 12: Relay, 13: Coil, 14: Shredding motor switch, 15 : Coil switch, 16:77
motor switch, 17: power switch, 18: commercial AC power supply. Applicant Sharp Corporation

Claims (1)

[Claims] A shredding device for shredding shredded paper, a shredding motor for driving the shredding device, a shredding motor cooling device for cooling the shredding motor, and driving of the shredding motor and shredding motor cooling device. and a temperature detector that detects a first set temperature during heating of the shredding motor and a second set temperature lower than the first set temperature;
A shredding motor control means that stops the shredding motor when the temperature reaches a first set temperature and starts when the temperature drops below a second set temperature, and a shredding motor cooling device that stops the shredding motor when the temperature reaches the first set temperature. 1. A document shredding machine comprising a cooling device control means for driving the document shredding device when the temperature drops below the second set temperature.