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    • 76. 再颁专利
    • Servosystem for electrical machining processes
    • 伺服系统用于电加工工艺
    • USRE29398E
    • 1977-09-13
    • US742458
    • 1976-11-17
    • Kiyoshi Inoue
    • Kiyoshi Inoue
    • B23H1/02B23H7/16B23H7/18
    • B23H1/024B23H1/022B23H7/16B23H7/18
    • A servosystem for electrical .[.maching.]. .Iadd.machining .Iaddend.processes adapted to regulate a spark-discharge gap in electrodischarge machining and other material-removal, shaping or forming operations in which the energy of an electrical discharge across the gap is exploited. Instead of the usual reference voltage or other electrical value for comparison with a gap parameter whereby the difference or other algebraic comparison controls the electrode drive, a gap detector is provided to feed a substantially continuous .[.(anlog).]. .Iadd.(analog) .Iaddend.value to a discriminator having a threshold value and producing a digital output in accordance with the comparison. The digital output represents an "advance" or a "retract" condition and is communicated via a suitable switch or amplifier to the respective electromagnetic member of the control system, the latter member being a servomotor mechanically coupled with the movable electrode or a fluid-control valve hydraulically or pneumatically coupled with the movable electrode.