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Pawl and Ratchet Photoconductor Incrementer

IP.com Disclosure Number: IPCOM000087672D
Original Publication Date: 1977-Mar-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 36K

Publishing Venue

IBM

Related People

Justus, DJ: AUTHOR [+2]

Abstract

In a document copier machine, it is desirable to periodically increment the pliable photoconductor on the drum surface in order to renew the photoreceptive material thereon. This relates to a pawl and ratchet incrementer which is simple, low in cost, reliable and small in size.

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Pawl and Ratchet Photoconductor Incrementer

In a document copier machine, it is desirable to periodically increment the pliable photoconductor on the drum surface in order to renew the photoreceptive material thereon. This relates to a pawl and ratchet incrementer which is simple, low in cost, reliable and small in size.

The figure shows a drum 10 with a supply shaft 11 and a take-up shaft 12, the latter two shafts located in the interior of the drum. When a signal is received to increment the photoconductor, the take-up shaft 12 is rotated, pulling the photoconductor off the supply shaft 11, over the surface of drum 10, and onto take-up shaft 12. This is accomplished by energizing a solenoid (not shown) which causes the detent 13 and the cam 14 (integral with detent 13) to rotate with drum 10. Each drum revolution causes cam follower 15 to rock which causes pawl 16 to move ratchet 17 by one tooth. Since the ratchet is rigidly attached to the take-up shaft 12, the latter is incremented causing the photoconductor to advance with it.

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