Electrostatographic apparatus comprising sheet sensors

Details Electrostatographic apparatus comprising sheet sensors Electrostatographic apparatus comprising sheet sensors

1979-08-09

1982-01-12

Reeves, Robert B.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

271111, 340674, 250223R, B65H 714, B65H 720

Patent

active

043101534

ABSTRACT:
A plurality of sensors (61), (62), (63), (64) are spaced along a sheet feed path (14) to sense the presence of a copy sheet (13) adjacent thereto. A timing signal generator (53) feeds timing signals to the sensors (61), (62), (63), (64) at times when the sheet (13) should be present at the sensors (61), (62), (63), (64), the timing signals enabling the sensors respectively. The outputs of the sensors (61), (62), (63), (64) are connected in a wired-OR configuration to produce a logical sum output. Each sensor (61) typically comprises a light source (88), a photosensor (91) and a power switch such as a transistor (86). Each power switch (86) is constructed to connect the light source (88), the photosensor (91) or both to a power source (+V) in response to the respective timing signal.

REFERENCES:
patent: 3150873 (1964-09-01), MacGregor
patent: 3204950 (1965-09-01), Hanchett, Jr.
patent: 3988730 (1976-10-01), Valker

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