Ribbon drive for a thermal demand printer

Details Ribbon drive for a thermal demand printer Ribbon drive for a thermal demand printer

1999-03-31

1999-11-30

Tran, Huan

Incremental printing of symbolic information

Thermal marking apparatus or processes

With transfer medium or driving means therefor

2424151, 400234, B41J 3352

Patent

active

059951281

ABSTRACT:
A novel demand printer is used for printing on tickets, tags, pressure sensitive labels and other media. The printer has a spring wrap clutch assembly operatively associated with a media delivery structure for use with a rotating shaft to maintain a constant tension on a ribbon. The spring wrap clutch assembly includes a coiled spring having a leg extending away from one end of the coil, a collar having a bore therein for receiving the coiled spring with the leg extending away from the collar, the rotating shaft extending through the coiled spring and the collar is attachable to the rotating shaft, and a plurality of ramped teeth positioned around the rotating shaft. Each of the ramped teeth has a sloped surface and the leg of the coiled spring controllably engages the ramped teeth.

REFERENCES:
patent: 4764041 (1988-08-01), Bierholf
patent: 4812063 (1989-03-01), Kunimitsu et al.

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