Control for dot matrix printers operating in harsh environments

Details Control for dot matrix printers operating in harsh environments Control for dot matrix printers operating in harsh environments

1985-06-06

1986-07-15

Sewell, Paul T.

Typewriting machines

Safety switch or condition-responsive-cutoff switch for...

400 52, 400668, 400679, B41J 2938

Patent

active

046003193

ABSTRACT:
A control processing method and apparatus for dot matrix printers which are ubjected to relatively high levels of vibration and shock. Vibration and shock are detected and, in the event that a known safe vibration or shock level is exceeded, print line data being fed alternately to the print head from a pair of data print buffers coupled to the output of a logic data input buffer are inhibited while the input buffer temporarily stores the incoming data. Drive pulses applied to the stepper motor used to move the print head carriage are simultaneously stopped. When the detected level falls below a set threshold indicative of a safe operating level, normal operation is resumed with the print data again being fed from the input buffer to the print line buffers which are reactivated along with the carriage stepper motor. Additionally, any positional change of the print head carriage during the existence of shock or vibration levels above the threshold value from the last valid driven position is determined and accordingly repositioned prior to continuing the printing operation upon cessation of the disturbance.

REFERENCES:
patent: 3354372 (1967-11-01), Beasley
patent: 3718243 (1973-02-01), Chvatlinsky
patent: 3753004 (1973-08-01), Dominic
patent: 3924722 (1975-12-01), Wienhold
patent: 3973662 (1976-08-01), Fulton
patent: 4203678 (1980-05-01), Nordstrom et al.
patent: 4405245 (1983-09-01), Fukushima

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