Printer having ribbon mask for reducing interference with record

Details Printer having ribbon mask for reducing interference with record Printer having ribbon mask for reducing interference with record

1991-05-15

1992-10-13

Eickholt, Eugene H.

Typewriting machines

Including interposed inking device for record-medium

Means auxiliary to ribbon mechanism

400 56, B41J 3332

Patent

active

051545217

ABSTRACT:
In a printer having a platen, a print head disposed opposite to the platen, and a ribbon mask fixedly provided on the print head and having a masking plate provided with an aperture to expose only the front end of the print head to the platen, an ink ribbon is extended through a space between the platen and the print head, and the masking plate is disposed between the platen and the ink ribbon to shield a recording sheet wound round the platen from the ink ribbon. The aperture of the masking plate has inclined edges inclined to a direction perpendicular to the direction of movement of the print head so as to intersect a platen center obliquely. In case the side edge of a floating portion of the recording sheet is caught in the aperture of the masking plate while the print head is moved, the side edge slides along the inclined edge to escape from the aperture, so that the side edge is not caught in the aperture of the masking plate.

REFERENCES:
patent: 4492484 (1985-01-01), Akazawa et al.
patent: 4688955 (1987-08-01), Isobe et al.
patent: 4712935 (1987-12-01), LaDue et al.
patent: 4856923 (1989-08-01), Smith
patent: 4904098 (1990-02-01), Hamilton
patent: 4929102 (1990-05-01), Mizutani et al.
patent: 4960337 (1990-10-01), Kato et al.
patent: 4964556 (1990-10-01), Ferguson
"Ribbon Shield of Printers" IBM Tech. Discl. Bulletin vol. 34, No. 5 Oct. 1991 pp. 9-10.
"Cardholder-Ribbon Guide Combination for Printers" IBM Tech. Discl. Bulletin, vol. 21, No. 12, May 1979 pp. 4744-4746.
"Ribbon Shield Structure for Printer" IBM Tech. Discl. Bulletin, vol. 26, No. 1, Jun. 1983, pp. 65-66.

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