Web tension and break sensor system for photosensitive web processors
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United States of America Patent
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Jul 30, 1985
Grant Date -
N/A
app pub date -
Sep 2, 1982
filing date -
Sep 2, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A sensing system senses web movement and web tension of a photosensitive web moving through a processor. The system includes a sensing arm pivotally attached about a pivot to the processor and a transport roller rotatably attached to one end of the sensing arm. The photosensitive web engages the transport roller such that the roller rotates. The other end of the sensing arm, on an opposite side of the pivot point, is biased in a direction opposing the web tension of the photosensitive web. A tension detecting mechanism detects the movement of the sensing arm when the web tension overcomes the biasing force and transmits an alarm signal indicating that the web tension has increased beyond a predetermined value. A web break detecting mechanism is preferably included and detects the rotation of the transport roller and transmits a signal when the transport roller stops rotating indicating that a web break has occurred.
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