Machine position sensing device
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United States of America Patent
Stats
-
Dec 20, 1988
Grant Date -
N/A
app pub date -
Sep 11, 1986
filing date -
Feb 13, 1985
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention is to permit accurate detection of the position of a movable machine part which is driven by a motor, through elimination of the influence of backlash. A position sensor (3) creates position sensing pulses each time a movable machine part (2) which is driven by a motor (1) is moved by a predetermined amount. Counting means (4) counts the position sensing pulses from the position sensor (3) and readout means (5) reads out the count value of the counting means (4) at predetermined time intervals. Cancel means (6) cancels the contents of the counting means (4) by a value equal to the count value read out by the readout means (5). Backlash amount storage means (7) has prestored therein the amount of backlash in the drive system, amount-of-movement computing means (8) computes the actual amount of movement of the movable machine part (2) for each predetermined period of time on the basis of the stored contents of the backlash amount storage means (7) and the value read out by the readout means (5), and integrating means (9) integrates the results of computation by the amount-of-movement computing means (8).
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