Method and apparatus for sensing sheets

Details Method and apparatus for sensing sheets Method and apparatus for sensing sheets

1984-06-28

1987-03-17

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356381, G01B 1106

Patent

active

046509917

ABSTRACT:
Apparatus for sensing the passage of sheets (48) through a nip (24), comprises a pair of guide surfaces (20,27) defining the nip (24); means (17,20) for passing sheets (48) through the nip (24); and sensing means formed by pairs of light emitting diodes (37) and phototransistors (38) (37,38) for sensing the deflection of one guide surface relatively to the other. Monitoring means (41,42,43) are provided for monitoring the output of the sensing means (37,38) and for storing a guide surface profile corresponding to the sensing means output when no sheet (48) is present. Comparison means (44) compares subsequent test profiles generated by the monitoring means (41,42) with the stored profile; and detection means (42) detects the presence of a sheet in the nip (24) only when there is a substantially uniform difference between the stored and test profiles.

REFERENCES:
patent: 4285745 (1981-08-01), Farabaugh
patent: 4491929 (1985-01-01), Ikoma et al.

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