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Stop Latch for Several Revolution Spring Return Drives

IP.com Disclosure Number: IPCOM000077556D
Original Publication Date: 1972-Aug-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Reed, DW: AUTHOR

Abstract

In a drive which has a shaft 10 which is incrementally driven and spring returned, a stop latch 12 is pivotally mounted with a follower arm and roller 13 and is spring-biased to engage a detent 14 in a stop disc 16 mounted on the shaft.

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Stop Latch for Several Revolution Spring Return Drives

In a drive which has a shaft 10 which is incrementally driven and spring returned, a stop latch 12 is pivotally mounted with a follower arm and roller 13 and is spring-biased to engage a detent 14 in a stop disc 16 mounted on the shaft.

One end of a belt 18 is wrapped about a return pulley 20. The other end is wrapped around a spring loaded restore pulley 22 slightly more revolutions than the feed requires of the shaft. The follower arm and roller 13 ride the surface of the belt on pulley 22.

The spring pulley 22 is driven by a clock motor type spring. As the feed causes the return pulley 20 to rotate with the shaft 10, the belt is wound on the outside of the return pulley. When sufficient layers of belt build up, the follower arm and roller 13 are raised, causing the latch 12 to disengage from the detent 14 in the stop disc. Only at the time that the belt is sufficiently unwound from the return pulley 20 can the latch 12 engage the stop disc detent 14.

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