Apparatus and method for sensing the perforations in a perforate

Details Apparatus and method for sensing the perforations in a perforate Apparatus and method for sensing the perforations in a perforate

1977-04-15

1979-02-20

Dahl, Lawrence J.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

353 26A, G06K 710

Patent

active

041409159

ABSTRACT:
The perforated strip is transported lengthwise along a predetermined transport path. The perforations have a width w and an inter-perforation spacing s as measured in the transport direction. The perforations are sensed at two predetermined sensing locations located along the transport path. The distance between the two sensing locations is equal to as .+-. bw, wherein a is equal to zero, unity or an integer greater than unity, and wherein b is a number greater than zero and less than unity. Sensing the perforations at sensing locations thusly spaced makes it possible to determine from the resultant signals the direction of strip transport.

REFERENCES:
patent: 3449588 (1969-06-01), Foskett
patent: 3891321 (1975-06-01), Hock
patent: 3950652 (1976-04-01), Yamashita
patent: 3999846 (1976-12-01), Sone et al.

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