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Concentric Ribbon Mechanism for Drum Printer

IP.com Disclosure Number: IPCOM000042163D
Original Publication Date: 1984-May-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hunt, RE: AUTHOR [+2]

Abstract

There is shown and described a drum-type printer having a carrier ribbon supply spool and take-up spool concentric to and outside the drum. Since the ribbon supply is proportional to the square of the spool radius, this configuration minimizes printer size while maintaining the required ribbon supply volume. In the figure, a cantilevered print drum 1 is fixed to shaft 2 which freely rotates in frame member 3. Drum 1 is powered by a motor 4 which also drives pulley 5 through cog belt 6. Printer carrier 7 moves back and forth on guide rod 8 and is driven by drum 1 through a gear connection (not shown). Ribbon supply spool 10 is mounted to carrier 7. Ribbon 11 is fed in a conventional manner to printhead 12 by drive roller 13 and pinch roller 14.

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Concentric Ribbon Mechanism for Drum Printer

There is shown and described a drum-type printer having a carrier ribbon supply spool and take-up spool concentric to and outside the drum. Since the ribbon supply is proportional to the square of the spool radius, this configuration minimizes printer size while maintaining the required ribbon supply volume. In the figure, a cantilevered print drum 1 is fixed to shaft 2 which freely rotates in frame member 3. Drum 1 is powered by a motor 4 which also drives pulley 5 through cog belt 6. Printer carrier 7 moves back and forth on guide rod 8 and is driven by drum 1 through a gear connection (not shown). Ribbon supply spool 10 is mounted to carrier 7. Ribbon 11 is fed in a conventional manner to printhead 12 by drive roller 13 and pinch roller 14. Printhead 12, which may be a thermal transfer-type printhead, is pivotable about post 15 mounted on carrier 7. After printing, used ribbon 16 is conventionally fed to take-up spool 17. As shown, print drum 1 is cantilevered to facilitate paper loading and unloading. The drum could be captured at both ends, however, and the carrier moved to the drum end to allow paper loading.

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