Skew detector

Details Skew detector Skew detector

1978-05-16

1980-05-06

Schacher, Richard A.

Sheet feeding or delivering

Feeding

With means to interrupt feeding

250561, B65H 708

Patent

active

042013780

ABSTRACT:
This invention concerns a photoelectric skew detection system which checks the alignment of rectangular articles travelling on a conveyor. The mechanism comprises four phototransistors (1,2,3, and 4) arranged in a narrow rectangular pattern. Two lamps (8,9) are provided, each lamp illuminating only the two phototransistors forming corners for a narrow dimension of the rectangle. If a trailing edge (6a) of a given rectangular article (6) crosses either of the two forward phototransistors (3,4), both of the two rearward phototransistors (1 and 2) must be lit. If one is not lit, an electrical circuit generates an error signal. In this manner, the mechanism simultaneously detects both skew conditions and a faulty lamp.

REFERENCES:
patent: 2818252 (1957-12-01), Nilsson
patent: 3131931 (1961-05-01), Fechkowsky
patent: 3240487 (1963-03-01), Templeton
patent: 3289808 (1965-06-01), Simmons
patent: 3316411 (1967-04-01), Linderman
patent: 3833816 (1974-09-01), Emura
patent: 3866053 (1975-02-01), Emura
patent: 3890509 (1975-06-01), Maxey

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