Unidirectional ribbon drive mechanism

Details Unidirectional ribbon drive mechanism Unidirectional ribbon drive mechanism

1988-06-15

1989-07-25

Wright, Jr., Ernest T.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

4001961, 400208, 400233, 400234, 74354, B41J 3322

Patent

active

048507253

ABSTRACT:
A ribbon is driven past the printing station of a printer only when the print head is moved in the right-to-left direction across the printer. An endless timing belt causes rotation of a gear pulley that is in mesh with an idler gear. The idler gear is supported on a pair of projecting fingers of a plate that is swingable on the center of the gear pulley. The idler gear is responsive to the direction of rotation of the gear pulley through a drag effect of the projecting fingers with the bottom surface of the idler gear.

REFERENCES:
patent: 3241385 (1966-03-01), Tomaro, Jr.
patent: 3923267 (1975-12-01), Eckerd et al.
patent: 3948382 (1976-04-01), Nesbitt et al.
patent: 3954167 (1976-05-01), Kranz et al.
patent: 3990564 (1976-11-01), Crump et al.
patent: 4342520 (1982-08-01), Isobe et al.
patent: 4416560 (1983-11-01), Wood et al.
patent: 4452542 (1984-06-01), Akazawa
patent: 4526486 (1985-07-01), Kikuchi et al.
patent: 4531849 (1985-07-01), Dobashi
patent: 4596480 (1986-06-01), Takada
patent: 4712931 (1987-12-01), Ohshima
IBM Technical Disclosure Bulletin, "Mechanical Ribbon Saver for Resistive Ribbon Printers", vol. 29, No. 11, Apr. 1987, pp. 4699-4704.

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