Circuit for preventing ink clogging in print nozzles of a print

Details Circuit for preventing ink clogging in print nozzles of a print Circuit for preventing ink clogging in print nozzles of a print

1996-10-10

1998-09-01

Lee, S.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

B41J 2165

Patent

active

058017240

ABSTRACT:
A circuit for controlling a printhead of an inkjet printer has a power supply unit for supplying different levels of first and second power voltages; a power control circuit which has a power switch and generates a power on signal or a power off signal in accordance with the on/off operation of the power switch; a first switching circuit which is switched on to form a transmission path for the first power voltage to generate a first switching power voltage if the power on signal is received, and is switched off to isolate the transmission path for the first power voltage if the power off signal is received; a second switching circuit for switching the second power voltage in accordance with the logic state of the first switching power voltage; a control unit which receives the first switching power voltage as an operating power to generate a switch on signal to the first switching circuit if the power on signal is received, and to generate a control signal for moving the printhead to a capping position and then output a switch off signal to the first switching circuit if the power off signal is received; and a driving unit which receives the first and second switching power voltages as an operating power and is driven to move the printhead to the capping position in response to the control signal output from the control unit.

REFERENCES:
patent: 4540997 (1985-09-01), Biggs et al.
patent: 4692777 (1987-09-01), Hasumi
patent: 4707714 (1987-11-01), Rosenthal et al.
patent: 5117244 (1992-05-01), Yu
patent: 5341163 (1994-08-01), Hanabusa
patent: 5359358 (1994-10-01), Shimamura
patent: 5389961 (1995-02-01), Takagi
patent: 5406317 (1995-04-01), Shimamura et al.
patent: 5448270 (1995-09-01), Osborne
patent: 5448271 (1995-09-01), Yamaguchi et al.
patent: 5572242 (1996-11-01), Fujii et al.

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