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Browse Prior Art Database

Adjustable Transducer Mount for Rotary Encoder

IP.com Disclosure Number: IPCOM000040464D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 2 page(s) / 72K

Publishing Venue

IBM

Related People

Wilson, JT: AUTHOR

Abstract

A moldable one-piece mount for an optical emitter transducer uses a flexure linkage to enable arcuate adjustment of the transducer with respect to a rotary encoding disk about a common center and achieves improved resolution, ease of adjustment and stability at a lower cost. Referring to Fig. 1, closed stationary frame 1 has mounting holes 2 enabling attachment to a rotary motor. Encoder disk 4, shown in phantom, has a succession of alternating transparent and opaque areas and is secured via hub 5 to motor shaft 6 (also in phantom). The bosses for mounting holes 2 are recessed to permit disk 4 to be (Image Omitted) shielded by ridges 7 and 8 during rotation.

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Adjustable Transducer Mount for Rotary Encoder

A moldable one-piece mount for an optical emitter transducer uses a flexure linkage to enable arcuate adjustment of the transducer with respect to a rotary encoding disk about a common center and achieves improved resolution, ease of adjustment and stability at a lower cost. Referring to Fig. 1, closed stationary frame 1 has mounting holes 2 enabling attachment to a rotary motor. Encoder disk 4, shown in phantom, has a succession of alternating transparent and opaque areas and is secured via hub 5 to motor shaft 6 (also in phantom). The bosses for mounting holes 2 are recessed to permit disk 4 to be

(Image Omitted)

shielded by ridges 7 and 8 during rotation. A movable and adjustable element 10 of the mount is secured at its bottom to stationary frame 1 by a pair of thin flexure webs 11, 12 and by adjusting screw 13 which passes through retaining spring 15 to threadedly engage flexible aligning link 14. Transducer assembly 16, having one or more light sources each with a mating photodetector on opposite sides of disk 4, has wires 17 and is attached to movable portion 10 to sense the moving series of narrow transparent disk indicia near the disk periphery. Webs 11 and 12 are symmetrically disposed on either side of an axis that passes through the center of motor shaft 6 and the active portion of transducer assembly 16. Flexure webs 11 and 12 are kinematically equivalent to rigid links that are .80 to .84 times the length of the flexure webs. Using these equivalent links, element 10 becomes the coupler on a 4 bar linkage and standard kinematic formulae can be applied to points on element...