Browse Prior Art Database

Geneva Wheel

IP.com Disclosure Number: IPCOM000080833D
Original Publication Date: 1974-Feb-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Bjerke, MH: AUTHOR [+2]

Abstract

This geneva wheel 10 comprises a relatively soft, elastomeric rim 12 which is molded onto a relatively rigid plastic hub 14, yielding a geneva wheel assembly that is significantly quieter than the more conventional plastic or steel starwheels commonly used in indexing mechanisms.

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Geneva Wheel

This geneva wheel 10 comprises a relatively soft, elastomeric rim 12 which is molded onto a relatively rigid plastic hub 14, yielding a geneva wheel assembly that is significantly quieter than the more conventional plastic or steel starwheels commonly used in indexing mechanisms.

Hub 14 comprises a radially extending disk portion 14a and collar portion 14b. A steel sleeve 14c, by means of which geneva wheel 10 may be fixed onto a supporting shaft 16, is molded in collar portion 14b. Rim 12 is formed with teeth 18 which are spaced by slots 20, and the teeth 18 have bevels 18a on their ends. Rim 12 also is provided with axially extending projections or teeth 22 in alignment with the teeth 18.

Geneva wheel 10 is driven from a drive shaft 24 having hub 26 fixed thereon. A pin 28 is eccentrically fixed with respect to shaft 24, and a semicircular flange 28 is provided on hub 26. As shaft 24 is driven, pin 28 successively enters slots 20 and thereby successively increments geneva wheel 10. Flange 28 passes between a pair of teeth 22 as pin 28 moves out of a slot 20 and into a succeeding slot 20, for holding wheel 10 from movement at the time.

A detent roller 30 on the end of a leaf spring 32 engages in the outer ends of slots 20 and on the bevels 18a, for yieldably holding wheel 10 in its incremented positions.

Hub 14 is of a relatively rigid plastic, and rim 12 is 20 per cent glass fibers (1/8 inch in length) with the remainder of polyurethane acting as a binder. Rim 12 may have a hardness of Shore D-60. Rim 12 is formed in a mold in which hub 14...