Thermal printing apparatus

Details Thermal printing apparatus Thermal printing apparatus

1989-02-07

1990-03-13

Reynolds, Bruce A.

Recorders

Thermal recording

346139R, 400120, G01D 1510, B41J 320

Patent

active

049086324

ABSTRACT:
A thermal printing apparatus includes a carriage body on which a thermal ribbon cassette is detachably mounted, a driving gear rotated in accordance with the movement of the carriage body, a spool shaft rotatably mounted on the carriage body for rotating a ribbon spool of a ribbon cassette, and a rotation transmitting mechanism adapted to interlink or interrupt between the driving gear and the spool shaft when a ribbon cassette is mounted on or removed from the carriage body, respectively. The thermal printing apparatus further includes a shaft operable to detect if a ribbon cassette is mounted, and the rotation transmitting mechanism includes an engaging member engageable with a disc portion secured to the shaft for holding the rotation transmitting mechanism in a state where the interlinking between the driving gear and the spool shaft is interrupted. By means of this structure, rotation of the spool shaft and gears connected therewith is stopped when printing on a sheet of heat-sensitive paper without thermal transferable ribbon, thus enabling the thermal printing apparatus to achieve higher speed printing with reduced load on a driving power source.

REFERENCES:
patent: 4516137 (1985-05-01), Yasui
patent: 4598301 (1986-07-01), Suzaki
patent: 4609299 (1986-09-01), Hattori et al.

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