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Ribbon Lift Variator

IP.com Disclosure Number: IPCOM000091690D
Original Publication Date: 1968-Apr-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Brown, LC: AUTHOR [+2]

Abstract

In a type bar typewriter, ink ribbon 10 is lifted to an impact point each print operation by linkage 11 upon pivotal oscillation of ribbon feed bail 12 extending laterally across the machine. Bail 12 is oscillated upon engagement with an end 13 of a typebar drive arm 14 that is causing the print operation. Both the amount of vertical movement to ribbon 10 and the timing of this movement with respect to printing impact can be varied slightly between succeeding cycles to avoid direct impact overlap on ribbon 10 by provision of eccentric ratchet 15 rotatably mounted on the lower end 13 of one or more selected arms 14. Ratchet 15 is retained in position by detent spring finger 16 and is indexed clockwise upon rightward movement of end 13 bringing ratchet 15 into engagement with spring pawl 17.

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Ribbon Lift Variator

In a type bar typewriter, ink ribbon 10 is lifted to an impact point each print operation by linkage 11 upon pivotal oscillation of ribbon feed bail 12 extending laterally across the machine. Bail 12 is oscillated upon engagement with an end 13 of a typebar drive arm 14 that is causing the print operation. Both the amount of vertical movement to ribbon 10 and the timing of this movement with respect to printing impact can be varied slightly between succeeding cycles to avoid direct impact overlap on ribbon 10 by provision of eccentric ratchet 15 rotatably mounted on the lower end 13 of one or more selected arms 14. Ratchet 15 is retained in position by detent spring finger 16 and is indexed clockwise upon rightward movement of end 13 bringing ratchet 15 into engagement with spring pawl 17. Eccentric 15 thus varies the lost motion between bail 12 and effective end 13 of the associated arm 14.

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