Bidirectional ink sheet driving mechanism in a thermal transfer

Details Bidirectional ink sheet driving mechanism in a thermal transfer Bidirectional ink sheet driving mechanism in a thermal transfer

1988-03-16

1989-03-14

Wiecking, David A.

Typewriting machines

Including interposed inking device for record-medium

Ribbon-feeding mechanism

4002362, 4002403, B41J 3316

Patent

active

048120634

ABSTRACT:
The thermal transfer printer of the present invention rotates a take-up roll and supply roll for an ink sheet by means of a first friction ring, which transmits the forward directed rotation of a driving motor for carrying the ink sheet to a take-up roll for the ink sheet by the friction force thereof when the ink sheet is carried in the forward direction and applies the brake power to the take-up roll for the ink sheet by frictional force thereof when the ink sheet is carried in the backward direction, and a second friction ring, which transmits the backwardly directed rotation of the driving motor to a supply roll for the ink sheet by the frictional force thereof when the ink sheet is carried in the backward direction and applies the brake power to the supply roll by the frictional force thereof when the ink sheet is carried in the forward direction. Accordingly, the ink sheet can be carried under the stabilized condition in both the forward direction and the backward direction, whereby the ink sheet, which is carried together with a recording paper in the initial position setting of the recording paper, can be rewound to use without wastefulness.

REFERENCES:
patent: 4577199 (1986-03-01), Saiki et al.
patent: 4611937 (1986-09-01), Sato et al.
patent: 4660053 (1987-04-01), Tsuturi et al.

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