| 摘要 |
A system for use in detecting jams in a series of members of defined length which are moving along a predetermined path includes a pulse generator for providing sequential pulses, each representative of a unit of length. A counter having a preset number therein representative of the defined length of a member plus an additional fixed length substantially less than that of a member receives an input from the pulse generator and from a sensor positioned adjacent the path of movement. During the period that a member is sensed, the preset count in the counter is reduced by the pulse generating means and if that count is reduced to zero, a jam condition is indicated and means are provided to stop movement of the members.
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