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Synchronous Drive With Backspacing

IP.com Disclosure Number: IPCOM000097543D
Original Publication Date: 1961-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 52K

Publishing Venue

IBM

Related People

Buslik, WS: AUTHOR

Abstract

With this arrangement a driven shaft may be stopped at one of a number of predetermined angular positions. It may be clutched to an input drive in one of a number of definite angular relations. The driven shaft is also capable of backspacing a limited number of steps.

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Synchronous Drive With Backspacing

With this arrangement a driven shaft may be stopped at one of a number of predetermined angular positions. It may be clutched to an input drive in one of a number of definite angular relations. The driven shaft is also capable of backspacing a limited number of steps.

A continuously driven input belt 1 drives pulley 2 which is free on driven shaft
3. A pair of studs in pulley 2 pass through holes in a clutch plate 4 which is on an axially shiftable shaft 5. The latter has a toothed clutch face 6 on its right end which can engage a similar clutch face 7 on the left end of driven shaft 3. A pulley 8 on shaft 3 and belt 9 provide the output drive. This can be synchronized with one of the predetermined angular positions of pulley 2 as determined by the number of teeth on clutch faces 6 and 7.

A coil spring 10 having a nominal internal diameter smaller than shaft 3 is around the right end of the shaft. One end of spring 10 is held by a tension spring 11 and its other end can contact a fixed stop 12. A magnet stop 13 may be engaged with a ratchet wheel 14 on the right end of shaft 3 to determine the arrested positions of shaft 3.

Upon counterclockwise rotation of shaft 3, spring 10 is frictionally driven with the shaft and stretches spring 11 until the left end of spring 10 contacts stop 12. Spring 10 unwinds enough to decrease the friction to a point where springs 10 and 11 are in equilibrium. When the drive is disengaged by shifting...