Modular optical shaft encoder having a slide gap centering mecha

Details Modular optical shaft encoder having a slide gap centering mecha Modular optical shaft encoder having a slide gap centering mecha

1996-03-11

1998-01-13

Hellner, Mark

Optics: measuring and testing

Velocity or velocity/height measuring

With light detector

25023113, 25023116, 250239, G01D 534, G01P 336

Patent

active

057084963

ABSTRACT:
A simplified mechanism for rotationally aligning and gapping a pattern wheel with respect to a stationary mask are provided as part of a modular optical shaft encoder in accordance with the present invention. Moreover, the present invention includes a simplified method of connecting and aligning a modular encoder to a shaft. A radial alignment mechanism is provided between engagement surfaces of the hub of the pattern wheel and the encoder housing for independently providing radial alignment. The engagement surfaces are designed so that as the surfaces are urged into engagement with one another, the encoder housing (and thus the mask pattern) becomes radially aligned to the pattern wheel (and specifically its pattern). As an independent functional mechanism, a linear cam member is utilized for gapping the hub of the pattern wheel and thus the pattern thereon to the stationary mask pattern. The method of the present invention includes steps for independently radially aligning the optical pattern of the pattern wheel to the mask pattern of the mask and for separately gapping the pattern wheel with respect to the mask.

REFERENCES:
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patent: 4375592 (1983-03-01), Cox et al.
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patent: 4794250 (1988-12-01), Togami
patent: 4982084 (1991-01-01), Ushiyama et al.
patent: 5057684 (1991-10-01), Service
BEI Motion Systems Company Technical Brochure, "MX21 Insta-Mount Series Modular Incremental Rotary Optical Encoder", 1989.
Design News, McCarty, Lyle H., "Encoder Provides Commutation and Position Feedback", Mar. 27, 1989, pp. 256-257.
Hewlett Packard Technical Brochure, "Quick Assembly Optical Encoder", HEDS-5500 Series, Jun. 1987.
Machine Design, "Twist, Snap, Twist, Twist. An Encoder with A Difference", Aug. 20, 1987 p. 45.

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