Browse Prior Art Database

Motor-Driven Ribbon Take-Up

IP.com Disclosure Number: IPCOM000043010D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Malloy, JJ: AUTHOR [+2]

Abstract

The drawing shows illustratively significant elements of interest of a of a ribbon feed system in which a printer ribbon 1 is advanced across a printhead 3 by nip rolls 5 and 7 and is then wound on a take-up spool 9. Such a ribbon feed system is described in detail in U.S. Patent 4,408,908. Drive motor 13 to worm gear 11 is controlled by switch 15 which turns motor 13 off and on in response to ribbon tension on arm 17. Take-up control can be precise and consistent since motor 13 drives only gear 11. A separate source drives rolls 5 and 7, which can also be precise and consistent since the load is not highly variable. Motor 13 turns gear 11, which directly turns take-up spool 9 through a matching worm gear 18 on the hub 19 carrying spool 9. Spring 21 biases arm 17 counterclockwise.

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Motor-Driven Ribbon Take-Up

The drawing shows illustratively significant elements of interest of a of a ribbon feed system in which a printer ribbon 1 is advanced across a printhead 3 by nip rolls 5 and 7 and is then wound on a take-up spool 9. Such a ribbon feed system is described in detail in U.S. Patent 4,408,908. Drive motor 13 to worm gear 11 is controlled by switch 15 which turns motor 13 off and on in response to ribbon tension on arm 17. Take-up control can be precise and consistent since motor 13 drives only gear 11. A separate source drives rolls 5 and 7, which can also be precise and consistent since the load is not highly variable. Motor 13 turns gear 11, which directly turns take-up spool 9 through a matching worm gear 18 on the hub 19 carrying spool 9. Spring 21 biases arm 17 counterclockwise. As ribbon 1 is wound more as it is fed through rolls 5 and 7, tension in ribbon 1 increases until it overcomes spring 21 and pulls arm 17 clockwise. After a predetermined movement arm 17 encounters switch 15 and activates it; switch 15 controls motor 13 by turning it off. Subsequent feeding of ribbon 1 by rolls 5 and 7 permits arm 17 to move counterclockwise. Switch 15 is opened, and motor 13 is again turned on. This alternating activity of arm 17 and motor 13 continues so long as additional ribbon is fed by rolls 5 and 7. Switch 15 is structured with some delay in reversing states (hysteresis) so that motor 13 reaches normal operating conditions before being...