| 摘要 |
An ink jet printer having a number of ink discharge nozzles, a number of actuators respectively associated with the nozzles and arranged to create pressure waves in the ink to be discharged from the respective nozzles, and a controller arranged to apply drive signals (38) to the actuators in accordance with print instructions for an image to be printed, wherein the drive signals (38) comprise print pulses (44) causing ink droplets to be ejected from the nozzles at timings when the respective nozzle faces an image part of a print medium, and spitting pulses (42) causing ink droplets to be ejected from the nozzles at timings when the respective nozzle faces a non-image part of the print medium, and the drive signals (38) further comprise pre-fire pulses (40) which have an amplitude below a threshold at which ink droplets are ejected, and the controller is arranged to apply the spitting pulses (42) in the form of combined pulse sequences that each comprise a number of pre-fire pulses (40) preceding the spitting pulse (42). |
