System for automatically inspecting a flat workpiece for holes

Details System for automatically inspecting a flat workpiece for holes System for automatically inspecting a flat workpiece for holes

1986-08-12

1987-12-08

LaRoche, Eugene R.

Optics: measuring and testing

By polarized light examination

With light attenuation

356394, 356398, 250560, 250561, G01B 1114

Patent

active

047115793

ABSTRACT:
An inspection system for automatically documenting and verifying the position and dimensions of holes in a flat sheet metal workpiece. The system includes a transparent, light diffusing inspection table upon which the workpiece is laid. A ball screw-driven yoke travels continuously along the inspection table in the Y direction and includes a bottom bar for positioning a source of illumination below the table and a top bar for positioning a plurality of optical sensor arrays above the table. The optical sensor arrays are responsive to the presence (or absence) of light energy which is diffused by the table. A detector is interconnected to the sensor arrays to detect light-to-dark and dark-to-light transitions which are representative of the edge of a hole. The transition data is read and stored in a microcomputer for subsequent display and/or print out. Circuitry is provided to multiplex the optical sensor arrays so that each pixel thereof is sequentially read in order to provide data corresponding to hole locations in the X direction across the table. The position of the yoke along the ball screw provides data corresponding to hole locations in the Y direction.

REFERENCES:
patent: 3291994 (1966-12-01), Romeo et al.
patent: 4105925 (1978-08-01), Rossol et al.
patent: 4360274 (1982-11-01), Norton-Wayne

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