Patent ID: 6702420
Filing Date: 2004-03-09
Classification: B41J

Abstract:
A liquid jetting apparatus comprisinga head member having a nozzle, a pressure-changing unit that can cause pressure of liquid in the nozzle to change in such a manner that the liquid is jetted from the nozzle, a reciprocating mechanism that can move the head member forward and backward at a variable speed in such a manner that the head member passes through a plurality of predetermined passage-positions, a forward-driving-signal generator that can generate a forward jetting-driving signal, based on a plurality of forward-timings respectively defined correspondingly to the plurality of predetermined passage-positions while the head member is moved forward, a forward-driving-pulse generator that can generate a forward driving pulse based on the forward jetting-driving signal, a backward-driving-signal generator that can generate a backward jetting-driving signal, based on a plurality of backward-timings respectively defined correspondingly to the plurality of predetermined passage-positions while the head member is moved backward, a backward-driving-pulse generator that can generate a backward driving pulse based on the backward jetting-driving signal, and a main controller that can cause the pressure-changing unit to operate based on the forward driving pulse while the head member is moved forward, and that can cause the pressure-changing unit to operate based on the backward driving pulse while the head member is moved backward, wherein a plurality of forward pulse-waiting-times are respectively defined correspondingly to the respective forward-timings, a plurality of backward pulse-waiting-times are respectively defined correspondingly to the respective backward-timings, the forward jetting-driving signal includes a plurality of forward pulse-waves that respectively rise up or fall down when the respective forward pulse-waiting-times have passed since the respective forward-timings, the backward jetting-driving signal includes a plurality of backward pulse-waves that respectively rise up or fall down when the respective backward pulse-waiting-times have passed since the respective backward-timings, and each forward pulse-wave and each backward pulse-wave have the same waveform.