Browse Prior Art Database

Keyboard Clutch

IP.com Disclosure Number: IPCOM000089286D
Original Publication Date: 1977-Oct-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Burton, LA: AUTHOR [+2]

Abstract

A retaining sleeve may be used to constrain the expansion of the coils of a spring clutch and to provide a means for deactivating the clutch, and the mounting of the clutch-retaining sleeve on the input arbor will cause vibration and noise to an objectionable level. Secondarily, the inertia of the sleeve may be sufficiently large to retard the actuation of the clutch.

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Keyboard Clutch

A retaining sleeve may be used to constrain the expansion of the coils of a spring clutch and to provide a means for deactivating the clutch, and the mounting of the clutch-retaining sleeve on the input arbor will cause vibration and noise to an objectionable level. Secondarily, the inertia of the sleeve may be sufficiently large to retard the actuation of the clutch.

These problems may be eliminated by a sleeve design like that illustrated above. Sleeve 10 is supported radially on clamp ring 6 and specifically on surface 8. Input arbor 2, by its size, will retain sleeve 10 axially between clamp ring 6 and the input arbor 2. Since the input arbor rotates at all times and the remainder of the clutch and output arbor 4 are stationary when a latch stops sleeve 10 to cause the clutch to unwrap and disconnect, there is no runout or radial oscillations of sleeve 10. Since the sleeve 10 is insensitive to input arbor 2 dimensional variations and runout, there is a substantially quieter and smoother operation of the clutch. Further, sleeve 10 can be relatively narrow, and have a low inertia and, thus, a faster operating time.

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