Typewriting machines – Including interposed inking device for record-medium – Ribbon-feeding mechanism
Patent
1986-10-28
1988-09-13
Wiecking, David A.
Typewriting machines
Including interposed inking device for record-medium
Ribbon-feeding mechanism
4002272, 400208, B41J 3326
Patent
active
047705540
ABSTRACT:
A cartridge is provided with an improved drive which meters ribbon to a constant and selected rate of ribbon advance. At least one ribbon drive cylinder is provided around which the ribbon is wrapped. The drive cylinder is preferably a rubber cylinder of selected diameter constituting a force fitted sleeve on a metering gear. Provision is made for a single but reversible coaxial small and large gear pair to mount at two different locations in the cartridge between a driven gear and the metering gear. The coaxial gears include a first large diameter gear with a greater number of teeth and a smaller diameter gear with a lesser number of teeth. By assembling the large gear in mesh the drive gear and the small gear in mesh with metering cylinder gear, ribbon speed is reduced. The ribbon can be moved at a low speed such as required in multi-strike ribbon applications. By inverting the gear and assembling it in a second location with the small gear driven by the drive gear and the large gear driving the metering gear, ribbon speed is increased. The ribbon can be moved at a high speed such as required in single strike applications. The metering gear is typically threaded with rubber sleeves of various diameters to permit ribbon speed to be precisely tailored to either ribbon or printer requirement.
REFERENCES:
patent: 4231667 (1980-11-01), Behrendt
patent: 4307969 (1981-12-01), Daughters
patent: 4353658 (1982-10-01), Craft
patent: 4400103 (1983-08-01), Daughters
patent: 4490059 (1984-12-01), Daughters
"Ribbon Drive"; D. P. Darwin; IBM Technical Disclosure Bulletin; vol. 19, No. 4, pp. 1407-1408.
R. D. Chenoweth et al; "Print Ribbon Stripper"; IBM Tech. Disc. Bull.; vol. 13, No. 8, p. 2235; Jan. 1971.
Wiecking David A.
Wordex Corporation
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