Stream feed detector for detecting document spacing

Details Stream feed detector for detecting document spacing Stream feed detector for detecting document spacing

1976-03-23

1977-06-21

Gensler, Paul L.

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

250223R, 198460, G06K 7015, G06K 1500

Patent

active

040314022

ABSTRACT:
For detecting inadequate separation of successive documents (i.e., stream feed) which pass in seriatim through an apparatus, a logic circuit a counter which begins to count when a first document passes a particular point in the apparatus. A flip-flop is set by a signal from a photosensitive element when a second document passes a second predetermined point. In normal operation, a decoder will respond at a fixed count to clear the flip-flop before a third document arrives at the photosensitive element. However, if the photosensitive element output changes again, indicating the third document has reached the second point before the fixed count is attained, a NOR gate connected to the photosensitive element and the flip-flop generates an inadequate separation or stream feed signal.

REFERENCES:
patent: 3485339 (1969-12-01), Miller et al.

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