Wafer orientation system

Details Wafer orientation system Wafer orientation system

1981-05-19

1983-03-15

Love, John J.

Conveyors: power-driven

Conveyor for changing attitude of item relative to conveyed...

By conveying randomly faced items and turning items to...

B65G 4724

Patent

active

043764827

ABSTRACT:
A wafer orienting apparatus having inwardly biased rollers, spaced about the circumferential edge of a wafer in contact with the edge. Two of the rollers are spaced apart a distance less than the dimension of a primary flat registration edge and are mounted to follow the wafer edge upon rotation of the wafer. When a flat registration edge passes these closely spaced rollers they move inwardly, activating switches associated with a coincidence circuit. When both switches are simultaneously activated, the coincidence circuit produces a signal which stops wafer rotation, thereby orienting the wafer. The rollers are mounted so that they can be moved from the path of wafer travel after wafer orientation, permitting a queue of wafers to be oriented, one after the other.

REFERENCES:
patent: 3297134 (1967-01-01), Pastuszak
patent: 3820647 (1974-06-01), Waugh, Jr. et al.
patent: 3972424 (1976-08-01), Levy et al.
patent: 4024944 (1977-05-01), Adams et al.
patent: 4242038 (1980-12-01), Santini et al.

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