Method for controlling the temperature of the printing head of a

Details Method for controlling the temperature of the printing head of a Method for controlling the temperature of the printing head of a

1984-12-05

1985-09-10

Eickholt, E. H.

Typewriting machines

Typing by other than type-face or type-die

Thermal

346 76PH, 400283, 219216, B41J 302

Patent

active

045402957

ABSTRACT:
A method for controlling the temperature of the printing head of an impact printer, capable of selectively changing the printing mode of the impact printer between the bidirection printing mode in which the printing head performs printing operation while it is moved in either of the reciprocating directions, the single direction printing mode in which the printing head performs printing operation while it is moved in one of the reciprocating directions and the idle reciprocation mode in which the printing head is merely reciprocated without performing printing operation, according to output signals of a low-level comparator which compares the measured temperature of the printing head with a low-level reference value and gives an alarm signal when the measured temperature is higher than the low-level reference value and a high-level comparator which compares the measured temperature with a high-level reference value and gives an alarm signal when the measured temperature is higher than the high-level reference value. The timing of changing the printing mode is controlled by timers to obviate unnecessary change of the printing mode so that the printing head is cooled appropriately and the printing capacity of the impact printer will not be reduced undesirably.

REFERENCES:
patent: 4113391 (1978-09-01), Minowa et al.
patent: 4389935 (1983-06-01), Arai
patent: 4391535 (1983-07-01), Palmer
patent: 4394092 (1983-07-01), Osmera et al.
patent: 4407003 (1983-09-01), Fukui
patent: 4420758 (1983-12-01), Tabata et al.

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