JPS60102961A - Document shredder - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a document shredding machine for shredding documents and the like.

Conventional configurations and their problems Conventionally, there are various configurations in which the cutter is started by inserting the paper to be shredded into the input slot, but there is a method that mechanically detects the input material using a microswitch actuator. This had the disadvantage that part of the cutter was overloaded and became locked, and when the cutter was turned over, the shredded material would flow backwards and get caught in the actuator, causing a breakdown.

Purpose of the Invention The present invention solves these conventional drawbacks by arranging a light-emitting element and a light-receiving element to face each other, and starting the motor when documents to be shredded are placed between them. The purpose of the present invention is to prevent malfunctions caused by external light, and to prevent the motor from rotating for a certain period of time even after the document passes through the detection section, so that no debris remains in the cutting section.

Structure of the Invention The document shredding machine of the present invention drives a light emitting element opposite to a light receiving element across a document input slot with pulses of a constant cycle,
The light-receiving element detects and detects this pulse of light, and the output charges the capacitor that makes up the timer. Even if the light-receiving element is affected by external light, the output of the detected pulse does not change. This ensures that the capacitor that makes up the timer is charged. Furthermore, when a document is inserted, the light pulse output from the light receiving element disappears, so the capacitor is not charged and its potential drops.

The potential across the capacitor is detected and the motor is energized when the potential is below a certain level.

Description of examples Examples thereof will be described below with reference to the drawings.

In the figure, 1 is a layer, 2 is a main body of the document shredding machine detachably installed in the upper opening of the layer 1, and a cutter 3.
A motor 4 is provided to drive the cutter 3 via a reduction gear. A light emitting element 6 is disposed on one wall of the shredded material inlet 5 provided above the cutter 3, and a light receiving element 7 is disposed in correspondence with the light emitting element 6 on the other wall of the inlet 5. ing.

The output of a pulse generation circuit 8 is connected to a light emitting element 6 made of a light emitting diode or the like, and the output of a light receiving element 7 made of a phototransistor or the like is connected to a detection circuit 9 that detects pulses.
connected to. The detection circuit 9 detects only the AC output of the light receiving element 7 and charges the capacitor 10. The voltage of the capacitor 10 is connected to the input terminal of a voltage comparator 12 which has a reference voltage 11 connected to one side.
The output of 2 is the drive circuit 13 of the motor 4 made of relays etc.
connected to.

14 is a discharge resistance of the capacitor 10.

In the above configuration, when no documents or the like are inserted into the input slot 5, the light pulse emitted from the light emitting element 6 reaches the light receiving element 7, and the light receiving element 7 outputs a pulse output. The detection circuit 9 detects each pulse output and charges the capacitor 1o.

When the potential of capacitor 1Q is higher than reference voltage 11, voltage comparator 12 does not output, motor drive circuit 13 does not operate, and motor 3 does not rotate.

Next, when paper is inserted into the input port 5, the light pulse is blocked and the light receiving element 7 does not output a pulse. Therefore, the detection circuit 9 does not output an output, and the charge in the capacitor 1o is discharged through the discharge resistor 14. When the potential of the capacitor 1o becomes lower than the reference voltage 1, the voltage comparator 1
2 shows the direction of output, the motor drive circuit 13 works, and the motor 3 rotates.

Then, the paper is shredded, and when the end of the paper passes the detection section, a light pulse reaches the light receiving element 7, and the output of the detection circuit 9 charges the capacitor 1o. Then, when the potential of the capacitor 10 rises and reaches a predetermined value, the motor 3 stops. At this time, the potential of the capacitor 1o gradually increases due to the output impedance of the detection circuit 9, so even if the end of the paper passes, the motor 3 does not stop immediately, but after a certain period of time has elapsed.

Effects of the Invention As is clear from the above embodiments, according to the present invention, a light emitting element and a light receiving element are provided between the input port, the light emitting element is driven with a pulse, and the light pulse emitted at this time is detected. This prevents malfunctions caused by external light. Also, by charging the capacitor with the output of the detection circuit,
Even after the end of the paper passes the detection section, the motor can continue to rotate for an appropriate period of time, and no paper remains.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a document shredding machine employing an embodiment of the present invention, FIG. 2 is a sectional view, FIG. 3 is a sectional view of essential parts, and FIG. 4 is a circuit diagram. 4...Motor, 6...Inlet, 6...
...Light emitting element, 7... Light receiving element, 9...
...detection circuit, 10... capacitor, 12.
...Voltage comparator, 13. Old... Drive circuit. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure, 5 Figure 2

Claims (1)

[Claims] A light-emitting element and a light-receiving element that are driven by a constant cycle pulse are installed across the document input slot, and the output of this light-receiving element is connected to a detection circuit to detect the pulse, and the output of the detection circuit is is connected to a capacitor, the potential of the capacitor is compared with a reference voltage using a voltage comparator, and the output of this voltage comparator is connected to a motor drive circuit to control the motor.