Printing device

Details Printing device Printing device

1989-04-12

1989-11-28

Pieprz, William

Typewriting machines

Including adjustment for optimum printing plane

400638, 400639, 4006361, 400356, B41J 1120, B41J 1304

Patent

active

048833754

ABSTRACT:
A guide shaft guides a print head, which moves along a print line of a platen to perform a printing operation. A rotating member and an eccentric cam member, having a toothed sector portion on its periphery, are mounted on the guide shaft. The guide shaft is guided on a frame by a bearing slot, so as to be movable toward and away from the platen. The eccentric cam member rotates as it is always spring-urged to engage a fixed engaging pin. As a result, the guide shaft moves in a direction transverse to its axis, thus changing a gap between the print head and the platen. As the eccentric cam member rotates in one direction, the print head moves away from the platen, in a retreat stroke. In a rear half of the retreat stroke, the toothed sector portion of the rotating member engages a toothed arm, which is connected to a paper bail member for holding a printing medium down on the platen. Thus, as the gap between the print head and the platen is widened, the paper bail member moves from a medium hold position and a release position off the platen.

REFERENCES:
patent: 3951249 (1976-04-01), Neilas et al.
patent: 4010834 (1977-03-01), Linder
patent: 4023662 (1977-05-01), Perucca
patent: 4024940 (1977-05-01), Hendrischk et al.
patent: 4341477 (1982-07-01), Theiler
patent: 4420269 (1983-12-01), Ackermann et al.
patent: 4611939 (1986-09-01), Fujiwara
patent: 4637415 (1987-04-01), Kikuchi et al.
patent: 4676675 (1987-06-01), Suzuki et al.

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