JPH0587294A - Safety device for press device - Google Patents

Abstract

PURPOSE:To detect an abnormal status in a working area between the start of press operation and its finish so as to record its image, in a device for carrying out the press operation by the ON operation of a start switch. CONSTITUTION:A camera 11 for image-taking the working area of a press device is arranged and the camera, a video recorder 14 and a memory 15 are connected to a controller 13. The image from the camera 11 between the start of press operation and its finish is compared with an image at a normal status in the memory 15 and its abnormal image is recorded in the video recorder 14.

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 press device such as a thermal transfer machine, and more specifically, it records a safety condition by recording an abnormal condition from the operation of a start switch to the time when the ram lower limit is reached. Relating to a device for ensuring the

[0002]

2. Description of the Related Art Generally, in a press device such as a tabletop press machine, a light emitting element is provided between a press drive area and an operator's work area so as to prevent an operator's hand from entering the pressing portion of a descending ram. Providing a large number of luminous flux using a light receiving element,
There is known a safety device for stopping the pressing operation if there is an object that blocks the light flux during the pressing operation (Japanese Patent Laid-Open No. Sho 61-61).
-103093, Do 63-43099, Dohei 3-
140698).

[0003]

By the way, in the method of the prior art, in which an emergency stop is performed when a foreign object blocks the light beam after the start, even if the intended purpose of ensuring safety can be achieved, the light shielding is achieved. Since the cause cannot be recorded, there is a drawback that it cannot contribute to the subsequent management improvement of the press machine.

Therefore, the present invention is designed to catch the foreign matter invasion into the work area between the start of the descent of the ram and the reaching of the descent limit by an image so that the cause of interruption of the press work can be grasped. The purpose is to provide a device.

[0005]

SUMMARY OF THE INVENTION The present invention is a safety device for a press device in which a press operation is started by operating a start switch, and means for imaging the work area of the press device with the start of the press operation. The present invention is characterized by comprising means for detecting an abnormality during a press operation and means for recording an image of a work area at the time of abnormality detection.

[0006]

According to the present invention, when a foreign material such as a hand enters the working area of the pressing device after the start switch is operated to start the pressing operation, this abnormality is immediately detected and the pressing operation is interrupted. In addition to taking measures, an image of the abnormal state in the work area is recorded as a record, which can be used as an improvement material for subsequent safety management.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a hot stamping type thermal transfer machine 1 as a pressing device, which is provided with a transfer unit 4 which is driven up and down by a ram 3 above a transfer table 2 on which a work W is set. A transfer plate 6 is attached to the lower surface of the heating plate 5 of the transfer unit 4, and the transfer film X laid over the film winding means 8 from the film supply means 7 is supplied below the transfer plate 6.

When the left and right start switches 9 and 9 are turned on, the transfer unit 4 descends and the transfer plate 6
Is pressed against the work W via the transfer film X, and by the pressing pressure and heat, the transfer pattern formed on the transfer plate 6 is transferred to the work W by the transfer layer of the transfer film X and is then provided. The transfer unit 4 is configured to rise and return to the standby position.

The operation of the thermal transfer machine 1 is performed by a pair of start switches 9 and 9 arranged on the left and right in the vicinity of the transfer table on the front surface of the machine.
Are executed almost at the same time (including a slight time difference of ON operation).

However, the thermal transfer machine 1 is provided with a camera 11 for laterally picking up an image on the transfer table 2 as shown in FIG. The camera 11 is configured to receive the light reflected by the parabolic reflector 12 installed on the other side through the monitoring zone on the transfer table 2, and the foreign matter entering the monitoring zone can be detected from the received light signal. It is configured to be done.

That is, as shown in FIG. 3, the controller 11, the camera 11, the video recording unit 14, and the memory 15 are connected to each other.
The image from 1 is processed in gray scale or color,
5 is compared with the normal image recorded in No. 5, and when there is an abnormality, the abnormal image is recorded in the video recording unit 14.

Next, the above operation will be described with reference to the flowchart of FIG. 4. When the transfer operation start signal is input in the first step S1, the camera 11 starts the image pickup in the second step S2.

In the third step S3, the image from the camera 11 is compared with the regular image in the memory 15 until the transfer unit 4 reaches the lower limit. 4 is lowered, and the processing is ended by the input of the transfer operation completion signal in the fourth step S4.

However, if there is an abnormality in the third step S3, the transfer unit 4 is immediately stopped and inverted and raised as shown in the fifth and sixth steps S5 and S6, and the abnormal image is used as data. The video is recorded in the video recording unit 14 and the process ends.

According to this, when an abnormal situation occurs in which a part of the body of the operator enters the transfer table 4 after the transfer unit 4 starts to descend, this is detected by the image and the transfer operation is performed. It will be interrupted and safety will be maintained. In addition, recording an image at the time of occurrence of an abnormality can contribute to the improvement of safety management after the fact.

[0017]

As is apparent from the above description, according to the present invention, when an abnormal state such as an article or an operator's hand getting into the working area occurs at the time of press operation, this can be dealt with. Since it can be left as an image record, it is possible to check what causes the above-mentioned abnormality is based, and it is possible to contribute to the improvement of management of the press machine.

[Brief description of drawings]

FIG. 1 is a front view of a thermal transfer machine to which the present invention is applied.

FIG. 2 is a schematic view showing a transfer table monitoring structure.

FIG. 3 is a control circuit diagram of the monitoring structure.

FIG. 4 is a flow chart diagram based on the control circuit.

[Explanation of symbols]

 1 Thermal Transfer Machine 4 Transfer Unit 9, 10 Start Switch 11 Camera 13 Controller 14 Video Recording Unit 15 Memory

Claims (1)

[Claims] 1. A safety device for a press device in which a press operation is started by operating a start switch, and means for imaging a work area of the press device when the press operation starts and an abnormality during the press operation is detected. And a means for recording an image of a work area when an abnormality is detected.