Restack jam detection

Details Restack jam detection Restack jam detection

1982-03-15

1984-11-06

Stoner, Jr., Bruce H.

Sheet feeding or delivering

Delivering to stack and feeding therefrom

With sheet sensor for selective location

271171, 271258, 271223, 250223R, B65H 130, B65H 714

Patent

active

044808240

ABSTRACT:
In a sheet handling apparatus in which flimsy sheets are stacked on top of a stack thereof, particularly in a recirculating automatic document handler for a copier, there is disclosed an improved mis-stacking detection system comprising an optical sensing system defining a sheet interruptable optical sensing path extending transversely above the sheet stack in a position to be interrupted by variously mis-stacked non-planar sheets extending above the stack, which the optical sensing system is connected to a time delay system and a sheet mis-stacking indicator such that activation of the mis-stacking indicator is prevented for brief interruptions of the optical sensing path corresponding to normal sheet stacking, but is activated by an interruption of the optical sensing path which continues for a preset time period indicative of the presence of a mis-stacked sheet. The optical sensing path extends angularly between, transversely over, the stack support from one side to the other and from adjacent one end thereof towards the opposite end thereof, but automatically accommodates the resetting of the sheet restacking edge guides for different sheet sizes.

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