| 摘要 |
A circuit for detecting documents jammed at the entry to an image fixing station in a copier includes a latch-controlled timer. Energization of a paper feed clutch sets the latch to initiate a timing cycle. A photoelectric circuit indicates whether the trailing edge of a document being fed to the image fixing station has cleared the entry. The proper output from this circuit clears the latch and interrupts the timing cycle. If the timer times out before the entry is cleared, the timer output is driven to a jam-indicating state.
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