Electricity: motive power systems – Positional servo systems – With particular 'error-detecting' means
Patent
1980-12-12
1982-11-16
Dobeck, B.
Electricity: motive power systems
Positional servo systems
With particular 'error-detecting' means
318466, 318571, 82 2B, G05B 106
Patent
active
043596762
ABSTRACT:
A control system for stopping a spindle at a predetermined rotational position, for driving a spindle in such a manner that a positional deviation between the present rotational position of a specified point on the spindle and a predetermined rotational position at which the specified point is to be stopped, is reduced to zero, thereby to stop the specified point on the spindle at the predetermined rotational position. First and second rotational position sensors are attached to the spindle at first and second specified points thereof, the position at which at least the first rotational position sensor is attached being adjustable. Further provided are changeover means and an orientation control circuit. The first position sensor produces a rotational position deviation signal when a tool is inserted into and withdrawn from a workpiece at the time of a boring operation, and the second position sensor produces a rotational position deviation signal when tools are changed. These deviation signals are applied to the orientation control circuit selectively by the changeover means. As a result, the orientation control circuit controls the rotation of the spindle so as to reduce to zero the difference between an average speed signal, which conforms to the actual rotational speed of the spindle, and each of the deviation signals, whereby a specified point on the spindle is stopped at a predetermined rotational position.
REFERENCES:
patent: 2537269 (1951-01-01), Harding
patent: 2753502 (1956-07-01), Kylin
patent: 2790280 (1957-04-01), Wilson et al.
patent: 3293417 (1966-12-01), Heissmeier
patent: 4206392 (1980-06-01), Shimajiri et al.
patent: 4227134 (1980-10-01), Haner
Dobeck B.
Fujitsu Fanuc Limited
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