Browse Prior Art Database

Unique Cam Arrangement for Printer Ribbon Feed Mechanism

IP.com Disclosure Number: IPCOM000046129D
Original Publication Date: 1983-Jun-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Purcell, BD: AUTHOR [+2]

Abstract

The present structure provides a unique cam mechanism to be used in a ribbon feed mechanism for an impact printer which will provide for the ribbon cartridge drive, ribbon lift or oscillation, and writing line visibility. A simple and efficient mechanism of the present invention will drive and oscillate the ribbon across the print line during the normal impact printer printing operation. Then, when the printer is stopped and print line visibility is required, the mechanism will serve to tilt the cartridge downwards so that the print line can be observed.

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Unique Cam Arrangement for Printer Ribbon Feed Mechanism

The present structure provides a unique cam mechanism to be used in a ribbon feed mechanism for an impact printer which will provide for the ribbon cartridge drive, ribbon lift or oscillation, and writing line visibility. A simple and efficient mechanism of the present invention will drive and oscillate the ribbon across the print line during the normal impact printer printing operation. Then, when the printer is stopped and print line visibility is required, the mechanism will serve to tilt the cartridge downwards so that the print line can be observed.

With reference to the figure, the combination of ribbon cartridge 10 and a printhead enclosed by the ribbon cartridge and not visible will be used to print upon line 11 on document 12 supported by platen 13. During the ribbon drive and oscillation procedure, cam member 14, which has an internal lead screw core mating with the screwed shaft 15 of drive motor 16, will be driven in a clockwise direction through the rotation of the shaft l5. This will drive cam 14 downwardly until the bottom 17 of cam 14 will rest against stop 18. When this occurs, cam 14 will be fixed to stop 18 by the screw threads, and consequently cam 14 will rotate in a counterclockwise direction driven by shaft 15. Cam follower 19, which rests on cam 14, will then be moved up and down in a reciprocal motion by the rotating cam 14. At the same time pulley 20, affixed to cam 14, will rotate...