Typewriting machines – Sheet or web – For feeding web record-medium
Patent
1987-06-08
1989-06-13
Pieprz, William
Typewriting machines
Sheet or web
For feeding web record-medium
400551, B41J 1124, B41J 1516
Patent
active
048387193
ABSTRACT:
A thermal color printer includes a reversible platen roller 9 and associated pinch rollers 11, 10 on the paper feed and discharge sides. The paper is repeatedly advanced back and forth through the printing station to successively print the different color separations. The discharge side pinch roller 10 is coupled to the platen roller by "unequal" spur gear 31, 32 and one-way clutches 33 such that it is frictionally driven by the platen roller in the sheet advance direction and gear driven by and at a slower speed than the platen roller in the reverse or sheet return direction. This serves to tension the sheet of paper during each return conveyance to thus maintain it in tight contact and registration with the platen roller, thereby avoiding offsets between the successive color separation printings and attendant fringe patterns.
REFERENCES:
patent: 4034842 (1977-07-01), Giacone
patent: 4043440 (1977-08-01), Busch
patent: 4360279 (1982-11-01), Sugihra
patent: 4505603 (1986-03-01), Yana
patent: 4642659 (1987-02-01), Nagashima et al.
Fitzgibbons et al., "Paper Take-Up . . . Feature", IBM Technical Disclosure Bulletin, vol. 23, No. 5, pp. 2159-2160, 10-80.
Momot et al., "Bidirectional . . . Feeding System", IBM Technical Disclosure Bulletin, vol. 27, No. 4B, pp. 2511-2512, 9-84.
Mitsubishi Denki & Kabushiki Kaisha
Pieprz William
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