Registers – Coded record sensors – Error checking
Patent
1977-06-27
1979-10-30
Kilgore, Robert M.
Registers
Coded record sensors
Error checking
33174B, 235456, 235458, 356375, 356378, G06K 500, B23F 2308, G06K 710, G01B 1128
Patent
active
041725530
ABSTRACT:
An apparatus for verifying the tolerance of the positions of holes in in form of a continuous web is moved over an opaque plate on which there are a plurality of transparent areas in the form of slits. The slits in the plate are illuminated by light sources placed above the plate. Photocells are placed below the plate in position with the slits so as to be responsive to the light coming therethrough. The moving web of punched material is positioned with respect to the plate such that when the holes are in tolerance they pass between pairs of slits, thereby blocking the light from reaching the photocells. If a hole position is out of tolerance, it passes over one or more of the slits, thereby permitting the corresponding photocells to provide an output. This indicates the presence of an out-of-tolerance hole. The disclosure further describes a multi-baseline technique, in which the longitudinal position of holes punched in the material is referenced to a single locator hole in the card, whose position with respect to the slits is periodically redefined, in order to provide improved accuracy in locating the position holes.
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patent: 3620629 (1971-11-01), Whittington
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Feather Larry M.
Ferrero Joseph
Kilgore Robert M.
The United States of America as represented by the Secretary of
Utermohle John R.
Young Barry N.
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