JPH0140661B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a starting device for a document shredding machine using ultrasonic waves.

Conventionally, there are various configurations in which the cutter is started by inserting the paper to be shredded into the input slot, but the type that uses a mechanical microswitch actuator to detect the input material is as follows:
If the cutter part is overloaded, it becomes locked, and when the cutter is turned over, the shredded material flows backwards and gets caught in the actuator, resulting in a failure.

There are also many other methods that use photoelectric conversion elements, but with this method, if the shredded material is transparent, the motor will not start, and the photoelectric conversion element will be exposed to dust. The performance deteriorated due to overheating, and the motor would sometimes start even though no shredded material had been input.

The present invention eliminates the above-mentioned conventional drawbacks, and embodiments thereof will be described below with reference to the accompanying drawings.

In the figure, 1 is a waste box, 2 is a main body of the document shredding machine detachably installed in the upper opening of the waste box 1,
The cutter 3 has a cutter 3 and a motor 4 for driving the cutter 3 via a speed reducer inside, and a shredded material inlet 5 is formed facing above the cutter 3. An ultrasonic oscillator 6 is provided on one side of the input port 5, and an ultrasonic receiver 7 is provided on the other side, and a decrease in the output level of the ultrasonic receiver 7 is sensed to drive the motor 5. It has a built-in motor drive circuit 8.

In the above configuration, since the ultrasonic receiver 7 normally senses the ultrasonic waves from the ultrasonic oscillator 6 and the output is at a high level, the motor drive circuit 8
It is in the OFF state and motor 4 does not operate.

When shredded material is put into the input port 5, the ultrasonic waves from the ultrasonic transmitter 6 are blocked by the shredded material, so the ultrasonic receiver 7 does not sense it, and the output level of the ultrasonic receiver 7 decreases. . The motor drive circuit 8 senses this decrease in the output of the ultrasonic receiver 7 and turns on, rotates the motor 4, and shreds the object.
When the shredding is finished and the shredded material passes the position of the ultrasonic receiver 7, the ultrasonic receiver 7 senses the ultrasonic waves that were previously blocked by the shredded material, and the output level increases. , the motor drive circuit 8 is turned off.

In this way, by using ultrasonic waves to detect the input of shredded material, it is possible to solve the biggest problem with conventional auto-start and auto-stop mechanisms.

In other words, when using a micro switch, which is a type of auto-start/auto-stop mechanism, when the lock is released by reversing when there is an overload, shredded material flows backwards and gets caught in the actuator of the micro switch. This eliminates problems such as breaking the air conditioner.

In addition, in the case of the photoelectric method, which is another method, there are malfunctions when the shredded material is translucent, malfunctions due to sensing of ambient light, and durability problems such as light emitting elements and Stable operation is possible without any problems such as poor operation due to poor sensitivity due to dust on the light receiving element.

As described above, according to the present invention, a highly reliable auto-start and auto-stop mechanism has been created, eliminating the inconveniences of the past, and making it easy to use as a document shredding machine without having to turn the switch on and off each time. We can provide good equipment.

[Brief explanation of drawings]

FIG. 1 is an external perspective view of a document shredding machine showing an embodiment of the present invention, FIG. 2 is a sectional view, FIG. 3 is an enlarged sectional view of essential parts, and FIG. 4 is a circuit diagram. 3... Cutter, 4... Motor, 5... Inlet, 6... Ultrasonic oscillator, 7... Ultrasonic receiver,
8...Motor drive circuit.

Claims (1)

[Claims] 1. A document shredding machine body with a cutter connected to a motor via a speed reducer and an input port for guiding shredded materials to the cutter, and an ultrasonic generator installed opposite the input port. comprising a transmitter, an ultrasonic receiver, and a motor drive circuit that receives an output signal from the ultrasonic receiver and controls energization of the motor, and when the level of the output signal from the ultrasonic receiver decreases, A document shredding machine in which the motor drive circuit supplies electricity to the motor.