Drive for thermal printing lift-off correction

Details Drive for thermal printing lift-off correction Drive for thermal printing lift-off correction

1983-10-11

1985-10-08

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Thermal

400696, B41J 300

Patent

active

045456933

ABSTRACT:
Ribbon (22) in thermal printing has an outer layer which adheres to printed characters at intermediate temperatures, lower than printing temperatures. The printhead (7) has a column of electrodes (9) which sweep across the character area. Lift-off is accomplished by the pattern control (40) controlling the current source (38) to provide rapid, square wave pulses displaced in phase 180 degrees at adjoining electrodes (9). The high level of the pulses is about that of the level at printing, and the pulses are sufficiently rapid so that their net effect is to raise the outer layer ribbon (22) to the intermediate temperature. At areas corresponding to underlines of characters, duration of the up period is longer. Good, long term reliability is achieved by the significant erase level being very close to the print level.

REFERENCES:
patent: 4350449 (1982-09-01), Countrymen et al.
patent: 4384797 (1983-05-01), Anderson et al.
patent: 4396308 (1983-08-01), Applegate et al.
patent: 4434356 (1984-02-01), Craig et al.
IBM Technical Disclosure Bulletin, article entitled "Thermal Printed Energization Circuit", vol. 24, No. 7B, Dec. 1981, at pp. 3968-3970.

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