Document set separator and stack height sensor

Details Document set separator and stack height sensor Document set separator and stack height sensor

1985-10-03

1986-05-20

Schacher, Richard A.

Sheet feeding or delivering

Delivering to stack and feeding therefrom

With sheet sensor for selective location

271 98, 271154, B65H 714

Patent

active

045896453

ABSTRACT:
In a recirculating document handler for a copier for recirculating document sheets from a stack thereof in a document tray of the document handler to be copied and to be restacked therein after copying, with a document feeder for feeding the documents from the stack which is automatically controlled in response to sensing the approximate height of the stack and sensing each time the stack has been so recirculated, in response to the position of elevation relative to the stack of a set separator finger, the improvement in the sensing system comprising two spaced switches positioned to be variably actuated in response to variable positions of the set separator finger, and the set separator finger being adapted for actuating one, none, or both of the switches at respective different positions thereof, and a control providing six different automatic controls in response to four different combinations of sensed actuations or non-actuations of the two spaced switches and the operating times at which the combinations of actuations or non-actuations are sensed, to provide respective signals responsive to a stack which is too high for reliable feeding, a stack which is high, a medium height stack, a low stack and no stack or the end of a circulation of the stack. The set separator finger is reset on top of the stack, in response to one of these four combinations of actuations or non-actuations, with a rotatable lever arm pivotally connected with the set separator finger to move it horizontally therewith and having a cam surface thereon spaced and positioned to engage and lift the set separator finger above the stack only after a predetermined distance of rotation of the lever arm away from the stack and then to release it after a predetermined distance of rotation towards the stack.

REFERENCES:
patent: 4469320 (1984-09-01), Wenthe
patent: 4480824 (1984-11-01), Acquaviva

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