Stack height sensing system

Details Stack height sensing system Stack height sensing system

1992-03-27

1993-05-04

Skaggs, H. Grant

Sheet feeding or delivering

Feeding

Separators

271260, 271265, 73 375, B65H 702

Patent

active

052074161

ABSTRACT:
An apparatus in which a stack of sheets is detected at a preselected location. An air jet is directed towards an edge of the stack of sheets at a preselected location. A pressure transducer is located at the prescribed location and positioned to have the air jet at impact thereon. The pressure transducer is enabled to transmit a signal indicative of the absence of the stack of sheets at the preselected location in response to the air jet impacting thereon. The pressure transducer is inhibited from transmitting the signal in response to the stack of sheets blocking the air jet. When the stack of sheets blocks the air jet, the signal from the pressure transducer indicates the presence of the stack of sheets at the preselected location. A pneumatic stack height detector of this type may be used to regulate the movement of a stack of sheets used in electrophotographic printing machines.

REFERENCES:
patent: 2902278 (1959-09-01), Bradshaw
patent: 3123355 (1964-03-01), Lessig
patent: 3734313 (1973-05-01), Gauthier et al.
patent: 3768806 (1973-10-01), Reehil
patent: 4801135 (1989-01-01), Povio

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