| 摘要 |
A pneumatic pulse counter in which a moveable count shaft is responsive to a pneumatic input signal at a first input port thereby providing, by means of a count pawl, a predetermined movement to a memory shaft. The final position of the memory shaft is frictionally retained by a retaining pawl while the count shaft returns to its initial position ready to respond to another input signal. A third shaft is provided responsive to a pneumatic input at a second input port to contact the retaining and count pawls thereby allowing the memory shaft to return to its initial position. Upon a total predetermined movement of the memory shaft, without the occurrence of an input at the second input port, an output signal is provided.
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