Cant dimension readere using moving light source

Details Cant dimension readere using moving light source Cant dimension readere using moving light source

1991-05-16

1992-08-25

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356387, G01N 2186

Patent

active

051421585

ABSTRACT:
After cutting of a cant, it is conveyed in a direction perpendicular to the long dimension of the cant against a pair of pin stops. A photo-diode array is positioned across the width of the cant adjacent one end of the conveyor and cant. The pins are aligned with one edge of the photo-diode array, which serves as a zero or reference point to measure the width of the cant. When the cant strikes the pin stops, a laser connected to a linear positioner having a servo-controlled hydraulic cylinder is extended by a piston along the opposite end of the conveyor until the emitted laser beam clears the the remote edge of the cant and strikes the photo-diode array. When the laser clears the cant and strikes the photo-diode array, the cant dimension is read from a transducer output associated with the linear positioner. Subsequent processing of the cant can be set, either manually or automatically, based on the dimension measured.

REFERENCES:
patent: 2978943 (1961-04-01), Balint
patent: 4887219 (1989-12-01), Strauser

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