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Feedback Angle Adjustment Apparatus

IP.com Disclosure Number: IPCOM000085388D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Garrison, SP: AUTHOR

Abstract

Adjustment of a sensor relative to a stepper motor emitter wheel becomes more critical and tedious as the number of steps per revolution increases. This problem is solved by utilizing an adjustable sensor in conjunction with two emitter wheels having a different number of openings.

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Feedback Angle Adjustment Apparatus

Adjustment of a sensor relative to a stepper motor emitter wheel becomes more critical and tedious as the number of steps per revolution increases. This problem is solved by utilizing an adjustable sensor in conjunction with two emitter wheels having a different number of openings.

A 1.8 degree step (200 steps/revolution) stepper motor 1 has an emitter wheel 2 connected to its shaft. Wheel 2 has 200 equally spaced slits or openings about the periphery thereof. In a closely adjacent plane is positioned a second emitter wheel 3 which is stationary. Wheel 3 has 199 openings equally spaced about the periphery thereof. On a fixed mounting bracket 4 is carried an adjustable photosensing unit 5. Exact alignment of an opening in each wheel will result in closely adjacent openings being substantially aligned for allowing greater resolution and more light to affect unit 5. Openings at right angles relative thereto will be 90 degrees out of alignment, and opposite openings will be 180 degrees out of alignment. Therefore, a substantial displacement of unit 5 along bracket 4 is permissible and has little effect on obtaining a desired feedback angle.

Alternatively, if wheel 2 were provided with 198 openings, a 360 degree adjustment of the feedback angle would be possible with a 180 degree displacement of unit 5.

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