JPH09136195A - Safety device for working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a safety device for a working machine excellent in the safety and capable of the working operation of excellent quality with a simple structure by providing a safety device on a punch of a press, etc. SOLUTION: A vertically movable upper tool 3 to work a work 6 is provided, a lower tool 4 is provided opposite to the upper tool 3, an outer cylinder 7 is fixed to the upper tool 4 so as to surround the circumference of the upper tool 3, a photo-sensor 9 is provided opposite to the outside of the outer cylinder 7 so that the light transmits the outer cylinder 7 to be received/transmitted, and an inner cylinder 10 which is provided in a slidable manner on the inner side of the outer cylinder 7 covering the upper tool 3, and capable of shielding the light of the photo-sensor 9 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a processing machine such as a caulking machine, a punch press machine, or a spot welding machine for sandwiching a work material with an upper tool and a lower tool for processing. .

[0002]

2. Description of the Related Art A caulking machine, a punch press machine, a spot welding machine, etc. perform processing by sandwiching a work material between an upper tool and a lower tool, but in both cases, the processing operation is performed by lowering the upper tool, which is common. Therefore, the caulking machine will be described as an example here. As a method for attaching a caulking member to a plate material, a method using a punch and a die of a press machine has been conventionally performed. Hold the plate material by hand to position it,
When the operation switch of the press is turned on, the punch descends and caulking work is performed. During this caulking work, there is a risk that a finger may be caught between the punch of the press machine and the plate material. When the operation switch is turned on at that time, the punch descends,
There is a risk of being pinched and injured.

Conventionally, as a safety device of a press machine, FIG.
As shown in FIG. 5, the light sensor 23 is installed on the side surface of the base 24 so that the light passes through the lateral direction of the work area. Is set, a signal is generated when an object that blocks the light of the optical sensor 23 is detected in the prohibited area, and the operation of the punch 21 is stopped even if the operation switch of the punch 21 of the press machine is turned on. There is a device for preventing a finger or the like from being injured due to lowering of the punch 21.

[0004]

As described above, in the conventional safety device, the sensor is provided in the lateral direction of the work area to set the work prohibited area in a wide range, but the work is prohibited in a wide area other than directly below the press machine. It becomes an area, and the operation of the press machine often stops for a short time, and there is the inconvenience that the work is significantly limited when a detailed work such as caulking work that requires the use of a hand is required.

In view of the above, the present invention provides a crimping device provided with a safety device in a punch of a press machine, which has a simple structure, is highly safe, has less work restrictions, and can perform high-quality crimping work, that is, other punch press machines. It is intended to provide a safety device for a processing machine such as a spot welding machine.

[0006]

In order to solve the above-mentioned problems, the safety device for a processing machine according to the present invention comprises a vertically movable upper tool 3 for pressing a caulking member 5 fixed to a plate member 6.
Is provided, a lower tool 4 is provided opposite to the upper tool 3, and an outer cylinder 7 surrounds the upper tool 3 so as to surround the upper tool 3.
A light sensor 9 is provided on the outside of the outer cylinder 7 so that light passes through the outer cylinder 7 to project and receive light. The upper sensor 3 is covered and the inside of the outer cylinder 7 can be slid. And an inner cylinder 10 that can block the light from the optical sensor 9. Further, the inner cylinder 10 is formed of a transparent member, and the optical sensor 9 is partially provided.
It has a light blocking portion 10b for blocking the above light.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. 3 is a front view thereof.

A caulking device according to an embodiment of the present invention will be described as an example. The caulking device 1 is roughly composed of a press machine 2, a punch 3, and a die 4. The press machine 2 has a structure in which a press rod is attached to the tip of an air cylinder (not shown) so as to be vertically movable. A punch 3 is attached to the press rod and moves up and down together with the press rod. A die 4 is erected so as to face the punch 3, and the tip of the die 4 is formed in a concave shape so that the caulking member 5 is dropped. A plate member 6 to be caulked is placed on the die 4.

The outer cylinder 7 is formed of a cylindrical opaque member such as metal or plastic, has an inner diameter substantially the same as the outer diameter of the large diameter portion 3a of the punch 3, and has a length of 2 from the top. It is fixed to the punch 3 with a screw so as to cover / 3.
A U-shaped sensor holder 8 is screwed to the lower part of the outer cylinder 7 so as to wind the outer cylinder 7, and a light projecting portion 9a and a light receiving portion 9b of an optical sensor 9 are provided on opposite sides of the U-shape. A notch for avoiding contact with the optical sensor 9 and a hole through which light passes are provided on both sides of the light projecting portion 9a and the light receiving portion 9b where the optical sensor 9 is provided. The outer cylinder 7 may be formed of a transparent material, for example, transparent plastic, for example, acrylic resin. Since the outer cylinder 7 is transparent, the light of the optical sensor 9 can pass through.

Inside the lower portion of the outer cylinder 7, a cylindrical shape having an inner diameter larger than the diameter of the small diameter portion 3b of the punch 3 is formed, and the inner cylinder 1 is made of an opaque material such as metal or plastic.
0 is set to be slidable. A flange portion 10a is formed on the upper end of the inner cylinder 10, and a stopper 7a formed inside the lower end of the outer cylinder 7 prevents the outer cylinder 7 from falling off.

The positions of the light projecting portion 9a and the light receiving portion 9b of the optical sensor 9 are provided at positions where the optical path formed by them is blocked by the rise of the inner cylinder 10. Moreover, the position of the optical sensor 9 at that time is prevented from being shielded by the punch 3 inside the inner cylinder 10. Further, when the inner cylinder 10 is formed of a transparent member, the light-shielding portion 10b is formed on the upper part and, for example, black paint is applied to the inner cylinder 1 in the same manner.
The light of the optical sensor 9 is blocked by the rise of 0.

Next, the operation will be described. First, the punch 3 of the press machine 2 is lowered to put the press machine 2 in the standby state. At this time, the outer cylinder 7 attached to the punch 3 and the inner cylinder 10 locked to the lower end of the outer cylinder 7 also slowly descend, and stop at the standby position of the press 2. In this state, the distance between the punch 3 and the die 4 is set to a distance such that the plate material 6 can be inserted, and the optical sensor 9 attached to the outer cylinder 7 is in a state of not being shielded from light. Next, the caulking member 5 and the plate member 6 are prepared on the die 4, and the caulking work is just waiting. However, if a finger or the like exists between the punch 3 and the plate 6 when the punch 3 descends, the outer cylinder 7
The inner cylinder 10 that can slide inside the container rises, and the light-shielding portion 10b provided on a part of the inner cylinder 10 is provided on the outer cylinder 7.
It reaches the optical path position of and blocks the light. The signal from the optical sensor 9 inhibits the operation of the press machine 2 and prevents the punch 3 from descending.

Further, in the crimping work, the inner cylinder 1
Since 0 covers the punch 3 and is placed in a state of being in contact with the inner cylinder 10 and the plate member 6, fingers and other foreign substances do not enter between the punch 3 and the plate member 6. However, if the inner cylinder 10
Even if the user lifts up and puts his finger between the punch 3 and the plate member 6, the light-shielding portion 10b of the inner cylinder 10 blocks the light of the optical sensor 9 due to the rise of the inner cylinder 10, and the operation of the press 2 is prohibited. The punch 3 does not descend even if the operation switch is turned on. When the operation switch is turned on in the standby state, the punch 3 descends and crimps. At that time, the inner cylinder 10 slides inside the outer cylinder 7 that descends together with the punch 3 and ascends, and shields the optical sensor 9, but in this case, the signal from the optical sensor 9 becomes invalid. Since the setting is made so that the lowering of the punch 3 is not stopped.

[0014]

As described above, in the safety device for a processing machine of the present invention, the outer cylinder fixed to the outer periphery of the upper tool is provided with the optical sensor, and the light-shielding portion of the inner cylinder that slides inside the outer cylinder is provided. When the light of the optical sensor is blocked, a signal is generated to prevent the operation of the upper tool. Then, only the range of the diameter of the inner cylinder is the minimum range in which the entry of foreign matter is prohibited. Therefore,
The restricted area is the minimum, the work area is large, and the work can be done safely without being restricted. Further, since the inner cylinder seals between the upper tool and the plate material, it is not possible for the fingers and the like to easily enter. Even if a finger enters, the optical sensor detects the entrance of the finger due to the rise of the inner cylinder,
It is possible to prevent the lowering of the upper tool and prevent injuries such as fingers. At the same time, since the inner cylinder is made of a transparent material, the operation of the upper tool can be easily seen from the outside, so that the working operation can be easily performed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a front view showing an embodiment of the present invention.

FIG. 4 is a sectional view showing an embodiment of the present invention.

FIG. 5 is a perspective view showing a conventional example.

[Explanation of symbols]

1 ... Caulking device, 2 ... Press machine, 3 ... Punch, 4 ... Die, 5 ... Caulking member, 6 ... Plate material, 7 ... Outer cylinder, 8 ... Sensor holder, 9 ... Optical sensor, 10 ... Inner cylinder, 10b ... Shading part

Claims (2)

[Claims] 1. An upper tool (3) movable up and down for processing a work material (6), a lower tool (4) provided so as to face the upper tool, and surrounding the upper tool. An outer cylinder (7) fixed to the upper tool, an optical sensor (9) provided opposite to the outer cylinder so that light passes through the outer cylinder to project and receive light, and the upper tool. A safety device for a processing machine, comprising an inner cylinder (10) which is provided so as to be slidable inside the outer cylinder so as to be slidable and capable of blocking light of the optical sensor. 2. The outer cylinder is formed of a transparent member, the light sensor is provided opposite to the outer cylinder so that the light of the light sensor is not blocked by the upper tool, and the inner cylinder is transparent. The safety device for a processing machine according to claim 1, wherein a part of the member is formed so as to be shielded from light.