Ink jet printer and drive method therefor

An inkjet printer having a plurality of nozzles for ejecting ink drops, a plurality of pressure generators each disposed corresponding to a respective one of said plurality of nozzles for pressurizing ink in said nozzles, and a carriage for transporting said nozzles relative to a printing medium for printing, said inkjet printer comprising:

• a reference signal generator for generating a reference signal having a single frequency;
• a driver circuit for applying to each of said plurality of pressure generators in synchronism with the reference signal one of the following:
• a first electric pulse having a first amplitude enabling ink drop ejecting, and
• a second electric pulse having a second amplitude lower than the first amplitude of the first electric pulse for mobilizing ink inside said nozzles;
• and
• a controller for controlling said driver circuit, said controller comprising;
• means for performing a printing process whereby the first electric pulse is selectively applied to at least a select one of the plurality of pressure generators according to recording content;
• and
• means for performing a nozzle recovery process whereby the second electric pulse is applied to at least one of the plurality of pressure generators a plurality of times, and the first electric pulse is then applied to the at least one of the plurality of pressure generators, for preventing nozzle clogging.

An ink jet printer having a plurality of nozzles for ejecting ink drops, a plurality of pressure generators each disposed corresponding to a respective one of said plurality of nozzles for pressurizing ink in said nozzles, and a carriage for transporting said nozzles relative to a printing medium for printing, said inkjet printer comprising:

• a reference signal generator for generating a reference signal having a single frequency;
• a driver circuit for applying to each of said plurality of pressure generators in synchronism with the reference signal one of the following:
• a first electric pulse having a first amplitude enabling ink drop ejecting, and
• a second electric pulse having a second amplitude lower than the first amplitude of the first electric pulse for mobilizing ink inside said nozzles;
• and
• a controller for controlling said driver circuit, said controller configured to perform a printing process whereby the first electric pulse is selectively applied to at least a select one of the plurality of pressure generators according to recording content;
• and performing a nozzle recovery process whereby the second electric pulse is applied to at least one of the plurality of pressure generators a plurality of times, and the first electric pulse is then applied to the at least one of the plurality of pressure generators, for preventing nozzle clogging.