Head biasing mechanism in a thermal printer

Details Head biasing mechanism in a thermal printer Head biasing mechanism in a thermal printer

1986-08-29

1989-07-04

Wiecking, David A.

Typewriting machines

Typing by other than type-face or type-die

Thermal

346 76PH, B41J 320

Patent

active

048446327

ABSTRACT:
A thermal printer for printing on a printing sheet. A print head with print elements opposes a platen and the printing sheet is located between the print head and platen. A head up-down mechanism for moving the print head toward and away from the platen has a biasing mechanism, a head release mechanism, and a change mechanism. The biasing mechanism includes an elastic member for urging the print head against the platen at least two levels of biasing force in the head down position. The head release mechanism selectively relieves the biasing force on the print head. The change mechanism effects selection between at least two levels of the biasing force produced from the force generated by the elastic member. The biasing force is related to the head movement speed or sheet movement speed. The energy applied to the print elements is based on the biasing force. A detection of the smoothness of the paper results in a variation in the biasing force on the print head.

REFERENCES:
patent: 3810192 (1974-05-01), Okabe
patent: 4173273 (1979-11-01), Hanakata
patent: 4420269 (1983-12-01), Ackermann et al.
patent: 4528572 (1985-07-01), Sasaki et al.
patent: 4595936 (1986-06-01), Nakajima et al.
patent: 4651165 (1987-03-01), Shimada
J. R. Perry; "Thermal Print Head Control"; IBM Technical Disclosure Bulletin; vol. 21. No. 4, pp. 1594-1595; Sep. 1978.
IBM Bulletin vol. 24, No. 7B, Dec. 1981 "Energy Control for a Thermal Printer".

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