JPH0727092Y2 - Safety device for electric stapler - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for an electric stapler.

[0002]

2. Description of the Related Art Conventionally, an electric stapler has been used in which a staple driving plate is vertically moved by an electric motor or a solenoid to drive the staple into a staple binding material. According to this electric stapler, the paper sheets to be stapled are the paper binding table and the staple driving plate,
By being inserted into the paper sheet insertion space formed between the stapler body containing the electric motor or solenoid and the drive mechanism, the electric stapler automatically starts,
The staple driving plate descends toward the paper binding table to drive the staples into the sheet, and then clinches. The height of the paper sheet insertion space, considering the safety of staple stapling operators and infants, so that the fingers of a person will not be inserted into the paper sheet insertion space and damaged by the staple driving plate and staples, It is set to be lower than the thickness of the hand and the thickness of the finger. When the height of the paper sheet insertion space is low, it is difficult to insert the paper sheet to be stapled into the paper sheet insertion space, and there is a drawback in that the operability of the electric stapler is poor. However, in order to improve the operability of the electric stapler, if the height of the paper sheet insertion space is increased, human fingers are inserted into the paper sheet insertion space as described above,
This is extremely dangerous.

[0003]

The object of the present invention is to improve the operability of the electric stapler and to provide a safety device for the electric stapler which is not damaged even when a person's finger is inserted into the sheet insertion space. Is to provide.

[0004]

According to the present invention, there is provided a touch sensor which is provided in the vicinity of a clincher provided on a paper binding table of an electric stapler and which is provided in the vicinity of the clincher and detects a contact of a human body, and a signal from the touch sensor electrically drives the clincher. And a control circuit for cutting off the power supply to the electric drive source of the stapler.

[0005]

According to the present invention, when a part of a human finger is inserted in the paper insertion space at or near the clincher position, the touch sensor detects this and the control circuit Since the power supply to the electric drive source of the electric stapler is automatically stopped, even if a part of a person's finger is inserted into a dangerous part of the paper sheet insertion space, there is no risk of damage. Therefore, the height of the paper sheet insertion space can be made higher than in the conventional case, the paper sheets to be bound can be easily inserted, and the operability of the electric stapler can be improved.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to FIGS. As shown in Figure 1,
The electric stapler equipped with the safety device 1 of the present invention includes a paper binding table 2, a staple driving plate, and an electric motor 3 (see FIG. 2).
And a stapler body 4 incorporating a drive mechanism and the like. The height of the paper sheet insertion space 4a between the paper binding table 2 and the stapler body 4 is set higher than that of the conventional electric stapler, and is higher than the thickness of a person's hand and the thickness of a finger. At the front end of the paper binding table 2, a clincher table portion 6 having a clincher 5 for clinching the staples is arranged on the upper surface of the paper binding table 2 almost at the same time as the staples are driven into the staple binding material by the staple driving plate. It is exposed. The clincher table portion 6 is configured so as to include the clincher 5 substantially at the center thereof, and the touch sensor 7 is disposed in close proximity to the clincher 5 and around the clincher 5. The conductive portion 7 a of the touch sensor 7 is made of a metal plate and is exposed on the upper surface of the paper binding table 2. The touch sensor 7 has a structure in which the conductive portion 7a is grounded through the human body when a human finger touches the conductive portion 7a. The safety device control circuit 9 for the electric stapler causes the power supply relay switch 8 (see FIG. 2) by grounding the conductive portion 7a of the touch sensor 7.
Is configured to open.

FIG. 2 shows an example of the safety device control circuit 9. The safety device control circuit 9 includes a touch sensor 7
And a detection circuit 1 to which a signal from the touch sensor 7 is input
0 and a power relay switch 8 driven by the output of the detection circuit 10. The power relay switch 8 turns ON / OFF between the electric stapler power supply 11 and the electric motor control circuit 12. The electric motor 3 is ON-OFF controlled by the output of the electric motor control circuit 12.

FIG. 3 shows an example of the detection circuit 10. The touch sensor 7 is connected to the tap 15 of the oscillation coil 14. The oscillating coil 14 includes an oscillating circuit 18 together with a capacitor 16 and a first transistor 17.
Are configured. The oscillator circuit 18 is always oscillating when the touch sensor 7 is not touched by a human hand, and the second transistor 19 driven by the output of the oscillator circuit 18 is non-conductive. This allows the power relay switch 8
Is in a normally closed state, and electric power is constantly supplied from the electric stapler power supply 11 to the electric motor control circuit 12 (see FIG. 4).

As shown in FIG. 5, when a human finger touches the touch sensor 7, the conductive portion 7a is grounded and the oscillation of the oscillation circuit 18 is stopped. As a result, the second transistor 19 becomes conductive, the power relay switch 8 is closed, and the electric stapler power supply 11 to the electric motor control circuit 12 is turned off. Therefore, the electric motor 3
Does not start.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an electric stapler including a safety device according to the present invention.

FIG. 2 is a block line circuit diagram showing a control circuit of the safety device of FIG.

FIG. 3 is a circuit diagram of a detection circuit forming a part of the safety device control circuit of FIG.

FIG. 4 is a block diagram of the safety device control circuit of FIG. 2, showing the operation of the safety device control circuit when there is no danger.

5 is a block diagram of the safety device control circuit of FIG. 2 showing the operation of the safety device control circuit when there is a danger;

[Explanation of symbols]

 1 Safety device 2 Paper binding table 3 Electric motor 5 Clincher 7 Touch sensor 8 Power relay switch 11 Electric stapler power supply 12 Electric motor control circuit

Claims (1)

[Scope of utility model registration request] 1. A touch sensor which is provided in close proximity to a clincher provided on a paper binding table of an electric stapler and detects a contact of a human body, and a power supply to an electric drive source of the electric stapler by a signal from the touch sensor. Electric stapler safety device consisting of a control circuit that shuts off the power.