Electricity: motive power systems – Positional servo systems – Multiple mode systems
Patent
1982-06-16
1985-04-23
Dobeck, B.
Electricity: motive power systems
Positional servo systems
Multiple mode systems
318592, 318593, G05B 1118
Patent
active
045132348
ABSTRACT:
A method and apparatus for controlling the return of a movable element of a machine tool to a predetermined grid point by controlling a movable element drive device in accordance with feedback pulses generated while the drive device is being driven to transport the movable element between grid points. The method includes the steps of specifying a position remote from the predetermined grid point by a distance which is less than the spacing between grid points, computing the deviation between the specified position and the current position of the movable element, positioning the movable element at the specified position by driving the drive device on the basis of the computed deviation and the feedback pulses, and driving the drive device at reduced speed to stop the movable element at the first grid point encountered following the initiation of reduced-speed drive.
REFERENCES:
patent: 3953774 (1976-04-01), Sato et al.
patent: 3976929 (1976-08-01), Rodier
patent: 3995206 (1976-11-01), Aronstein
patent: 4085890 (1978-04-01), Kimura et al.
patent: 4166970 (1979-09-01), Cardot
patent: 4225928 (1980-09-01), Ohkubo
patent: 4312033 (1982-01-01), Sweeney et al.
Kiya Nobuyuki
Nozawa Ryoichiro
Dobeck B.
Fujitsu Fanuc Limited
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