Title: Electric discharge machining apparatus

Abstract: An electric discharge machining apparatus for cutting and shaping a workpiece into an article having a desired configuration in which the period of time required until the speed of a table carrying the workpiece becomes constant is made quite short. Comparator means compares a gap voltage between a wire-shaped electrode and a workpiece with a reference voltage to produce an error voltage. In one embodiment, a non-linear amplifier is disposed between the output of the comparator means and the input of an integrator. In the integrator, a clamping diode is coupled across an integrating capacitor so as to prevent the output of the integrator from becoming negative.

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Inventors: Tanaka, Yutaka (Aichi, JP)
Yatomi, Takeshi (Aichi, JP)
Ozaki, Yoshio (Aichi, JP)

Application Number: 06/186806
Filing Date: 1980-09-12
Publication_date: 1982-07-13
Assignee: MITSUBISHI ELECTRIC CORP

Primary Class(es): 219/69.160 219/69.120
Other Classes: B23H7/04; B23H7/06; B23P1/12
US Patent Ref:

2223177	November, 1940	Jones	219/69G	Automatic electric welding
3793502	February, 1974	Bell, Jr.	219/69G	SERVO FEED CONTROL CIRCUIT FOR ELECTRICAL DISCHARGE MACHINING APPARATUS
3989921	November, 1976	Ohi et al.	219/124.03	Method and apparatus for non-consumable electrode type automatic arc welding

Other Refs:
Primary Examiner: Shaw C. C.
Assistant Examiner:
Attorney: Sughrue, Mion Zinn Macpeak And Seas

Claims: