Electric heating – Metal heating – Cutting or disintegrating
Patent
1988-11-29
1989-11-14
Pellinen, A. D.
Electric heating
Metal heating
Cutting or disintegrating
219 6919, B23H 704
Patent
active
048809578
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a wire-cut electrical discharge machine. More specifically, it is related to a wire-cut electrical discharge machine having a means for preventing an accident due to an electric shock, which means detects a disturbance in the running of an electrode wire, at an area near a used electrode wire collection section, by an electrical means, the wire passing through an electrospark machining area and being collected in the electrode wire collection section in, for example, a collection box, thereby detecting an abnormal collection of a used wire and immediately stopping an electric power supply to prevent an accident due to an electric shock.
BACKGROUND ART
An electric power for machining is supplied to an electrode wire in an electrospark machining area of a wire-cut electrical discharge machine. Namely, a discharge voltage is applied between the electrode wire and a workpiece through an electric power supply member, and thereby an electrospark is formed at a small gap therebetween in an electrospark machining area and machining is carried out. However, an electric charge remains in a used wire that has passed through the electrospark machining area and reached a used wire collection section, because of the electric power supply to the electrode wire. Therefore, in the prior art, a cover member made of an electrical insulating material such as a plastic material, is fitted over a path of the electrode wire to be collected in the wire collection section, to protect a worker from the affects of an electric shock caused by touching the electrode wire. Specifically, when the used electrode wire reaches the used wire collection section area, it is always electrically charged, because an automatic connection of wires is immediately made when an electrode wire is cut in the electrospark machining area in the latest wire-cut electrical discharge machine provided with an automatic wire connection device. In consequence, a problem arises of safety in that the wire can be touched before the same is completely collected in the wire collection section. Therefore, the cover member is fitted to prevent accidents due to an electric shock.
This safety is secured by the cover member as mentioned above when the electrode wire is normally collected while the electrospark machining is continuously carried out by an automatic connection of wires, even though an electrode wire is cut in the above-mentioned wire-cut electrical discharge machine provided with an automatic wire connection device. Nevertheless, if the problem of an over-accumulation of used electrode wire in the wire collection section occurs, a disturbance of the running of the electrode wire to the wire collection section after having passed through the electrospark machining area occurs, and the electrode wire will touch a conductive part or the machine body near the path of the running electrode wire, and consequently, an electric charge will leak through the machine portion and outside the area provided with a cover member, to cause an accident due to an electric shock.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to improve the safety during operation of a wire-cut electrical discharge machine.
In view of the above-mentioned objects, the present invention provides a wire-cut electrical discharge machine having a means for preventing an accident due to an electric shock, wherein the machine guides an electrode wire, which is fed from an electrode wire supply reel and supplied with an electric power from an electric power source via an electric power supply member, and runs to an electrode wire collection section through an electrospark machining area in which a workpiece is machined by an electrospark between the workpiece and the electrode wire, to the electrode wire collection section by means of a roller device disposed just before the electrode wire collection section, the means comprising: a safety circuit for stopping an electric power supply from the electric power sourc
REFERENCES:
patent: 4663509 (1987-05-01), Kawashima
patent: 4667077 (1987-05-01), Goto
patent: 4689462 (1987-08-01), Goto
patent: 4751364 (1988-06-01), Tobler et al.
AR Patents De Invencion 221.933, pp. 412-413, Pet. 1980.
Aso Toshiyuki
Hosoda Hiroshi
Evans Geoffrey S.
Fanuc Ltd.
Pellinen A. D.
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