Method for the synchronous operation of juxtaposed cylinder devices
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United States of America Patent
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Jun 18, 1991
Grant Date -
N/A
app pub date -
May 9, 1989
filing date -
Nov 10, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Either a reciprocating or a stationary part in each of juxtaposed cylinder devices is provided with a scale having alternate projections and depressions which are arranged with regular pitches in a direction of reciprocation of the reciprocating part, while the other part is provided with a sensor engaging the scale for determining whether it is a projection or depression of the scale that the sensor engages at a particular point of time, and producing a pulse whenever it falls in any of the depressions. According to one preferred embodiment, the projections and the depessions of the scale of one of the cylinder devices are staggered relative to those of the scale of the other cylinder device by half a pitch. Thus, when the two cylinder devices are in synchronous operation, the sensors of the cylinder devices produce alternate pulses which do not overlap with each other in the time of occurrence. Therefore, if and when the pulses produced by the two sensors have overlapped with each other in the time of occurrence, it is determined that the operations of the two cylinder devices have become unsynchronized.
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