Method for preventing overheating of a thermal line print head b

Details Method for preventing overheating of a thermal line print head b Method for preventing overheating of a thermal line print head b

1989-12-05

1992-10-27

Lee, Thomas C.

Recorders

Record receiver deforming

395775, 346 76PH, 3642219, 3649218, 364DIG1, 364DIG2, G06F 1546, G01D 1510

Patent

active

051596938

ABSTRACT:
A control method prevents overheating of a line print head, the line print head for printing 4800 print dots per print line in response to print data. The print data is initially divided into sixteen blocks of print data denoting successive segments of the print line. The sixteen blocks of print data are then grouped into two groups and two-strobe printing is effected for one line. The temperature of the print head is detected and compared with a threshold temperature. If the temperature of the line print head exceeds the threshold temperature, subsequent print lines are carried out according to a four-strobe system, that is, the sixteen blocks of print data are divided into four groups. If the temperature of the line print head continues to exceed the threshold temperature, the printing is carried out according to an eight-strobe system, and so on. As such, by reducing the number of blocks of print data simultaneously printed, the printing operation is slowed, thus reducing overheating of the line print head.

REFERENCES:
patent: 4262188 (1981-04-01), Beach
patent: 4394664 (1983-07-01), Lapeyre
patent: 4560993 (1985-12-01), Hakokyama
patent: 4590488 (1986-05-01), Sullivan
patent: 4639741 (1987-01-01), Inoue
patent: 4651164 (1987-03-01), Abe et al.
patent: 4912485 (1990-03-01), Minowa
patent: 4933867 (1990-06-01), Ishigaki

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