Right and left-hand screw thread optical discriminator

Details Right and left-hand screw thread optical discriminator Right and left-hand screw thread optical discriminator

1988-04-18

1989-05-16

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

209929, G01N 904, G06M 700, H01J 4014

Patent

active

048312517

ABSTRACT:
An optical device for discriminating threaded workpiece by the handedness by their screw thread profiles. The device presents a pair of light beams which pass generally tangent to the workpiece at angularly displaced positions. The light beams are inclined to follow the helix direction of a given handedness of a workpiece. Upon axial advancement of a workpiece through the device, a chopped output from the photodetectors indicates that the handedness of the threads matches the inclination of the light beams. The oppositely threaded workpiece, however, provides a generally constant DC output. With appropriate signal processing electronics, an automatic system for discriminating workpieces by thread handedness is provided.

REFERENCES:
patent: 4326808 (1982-04-01), Pryor et al.
patent: 4441817 (1984-04-01), Pryor
patent: 4506980 (1985-03-01), Pryor et al.

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