Incremental printing of symbolic information – Ink jet – Controller
Patent
1998-06-22
2000-05-30
Hartary, Joseph
Incremental printing of symbolic information
Ink jet
Controller
347 9, B41J 201
Patent
active
060683600
ABSTRACT:
In a printer head drive system for a printing apparatus, both a voltage drop caused by power supply conductors connecting a power supply unit and a driver IC in a head unit and a voltage waveform distortion caused by a nonlinear input-output characteristics of the driver IC are compensated by a negative feedback control. In one aspect, voltage dividing resistors detect a voltage applied to the power supply input terminals of the driver IC and a constant voltage circuit regulates the voltage detected by the resistors to a reference voltage. In another aspect, a voltage applied to a dummy printer head is detected for the feedback control without voltage detecting resistors. A power amplifier in the power supply unit has a push-pull transistor circuit, and a series circuit of a resistor and a capacitor is connected in parallel with each base resistor. This arrangement improves responsiveness of the printing operation of the printer head which has a large electrostatic capacity.
REFERENCES:
patent: 4560998 (1985-12-01), Wimmer
patent: 4808845 (1989-02-01), Suzuki et al.
patent: 4860034 (1989-08-01), Watanabe et al.
patent: 5130726 (1992-07-01), Fukushima et al.
patent: 5172142 (1992-12-01), Watanabe et al.
Brother Kogyo Kabushiki Kaisha
Hallacher Craig A.
Hartary Joseph
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