Printer

Details Printer Printer

1996-12-16

1998-05-05

Fuller, Benjamin R.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

400279, B41J 2300, B41J 2116

Patent

active

057482063

ABSTRACT:
The variation is the moving speed of a carriage, mainly due to the variation of the mass of the carriage with the consumption of ink, is corrected every printing cycle to enhance the accuracy of printing. PWM values for an acceleration period and a constant-speed period are examined to see if the PWM values are appropriate every printing cycle. A moving speed in the present acceleration period is compared with a first desired moving speed. When the moving speed is lower than the first desired moving speed, the PWM value is incremented by 1 to increase the duty factor of a PWM signal to be given to a CR motor in the next acceleration period. A maximum and a minimum moving speed are measured in the present constant-speed period, the maximum and the minimum moving speed are compared with a second desired traveling speed, or a maximum and a minimum allowable moving speed, and a PWM value for the next constant-speed period is determined on the basis of the comparison.

REFERENCES:
patent: 4459050 (1984-07-01), Goldberg et al.
patent: 4777609 (1988-10-01), Cavill et al.
patent: 5310272 (1994-05-01), Nishizama
patent: 5439301 (1995-08-01), Nishizama

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