Numerical control apparatus of machines

Details Numerical control apparatus of machines Numerical control apparatus of machines

1991-03-19

1992-10-06

Ip, Paul

Electricity: motive power systems

Positional servo systems

Program- or pattern-controlled systems

318570, 318626, 318630, 318574, 36447435, 36416701, G05B 1101, G06F 1546

Patent

active

051534908

ABSTRACT:
In a machine tool having a table adapted to support a workpiece, a plurality of drive shafts for moving the table in three directional directions by servomotors, servo control apparatus controlling the servomotors in response to position instructions, drive shaft control apparatus including position detectors of the servomotors, each drive shaft control apparatus is made up of a servomotor rotation reversal detector for producing a movement reversal signal, a memory device for storing correction amounts necessary to compensate for a position error of the axis of the spindle of the machine tool which occurs as a result of reversal of the direction of movement of the drive shaft and other drive shafts and a transfer switches for selecting the memory device in response to the movement reversal signal and for feeding back to the servo control apparatus the correction amount read out from the memory device.

REFERENCES:
patent: 4514813 (1985-04-01), Nozawa et al.
patent: 4549120 (1985-10-01), Banno et al.
patent: 4743823 (1988-05-01), Fujita
patent: 4864211 (1989-09-01), Kawaguchi
patent: 4933800 (1990-06-01), Yang
patent: 4961036 (1990-10-01), Arikawa
patent: 5015935 (1991-05-01), Iwashita

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