Unitary aligning and gapping apparatus for modular optical shaft

Details Unitary aligning and gapping apparatus for modular optical shaft Unitary aligning and gapping apparatus for modular optical shaft

1990-08-30

1991-10-15

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250229, G01D 534

Patent

active

050576844

ABSTRACT:
An apparatus and method is disclosed for centering a pattern wheel of a modular optical shaft encoder and setting a predetermined gap distance between the pattern wheel and a mask and photodetector. The apparatus is built in to the encoder and facilitates aligning and gapping of the pattern wheel with respect to the mask and photodetector during installation of the encoder about a rotatable shaft. The apparatus consists of a slidable linear cam which cooperatively engages a centering collar to urge the collar against a pattern wheel, the pattern wheel is in turn urged into a predetermined position. The collar is retractable from contact with the pattern wheel after the pattern wheel is mounted in position on the rotatable shaft to allow rotation of the wheel and the shaft.

REFERENCES:
patent: 4184071 (1980-01-01), Fryer et al.
patent: 4285595 (1981-08-01), Fryer et al.
patent: 4338517 (1982-07-01), Perrine
patent: 4342909 (1982-08-01), Accattino
patent: 4475034 (1984-10-01), Maddox et al.
patent: 4794250 (1988-12-01), Togami
BEI Motion Systems Company Technical Brochure, 1989.
McCarty, Lyle H., Encoder Provides Commutation and Position Feedback Design News, 3-27-89, pp. 26-27.
Hewlett Packard Technical Brochure, Quick Assembly Optical Encoder, Jun. 1987.
Twist. Snap. Twist. Twist. An Encoder with a Difference Machine Design, Aug. 20, 1987, p. 45.

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