Fluid jetting device, printing apparatus, and method therefor

A method for controlling a process of jetting a fluid droplet from a fluid jetting device, the fluid jetting device comprising a nozzle plate, a fluid chamber terminating in an orifice in the nozzle plate, an actuator for generating a pressure wave in a fluid in the fluid chamber leading to a fluid droplet from the orifice of the fluid chamber and a jetting waveform generating device connected to the actuator for generating an excitation waveform comprising two separated pulses, called a jetting pulse and a quenching pulse, the jetting pulse for generating a pressure wave in the fluid in the fluid chamber leading to a fluid droplet and the quenching pulse for substantially cancelling a pressure wave in the fluid in the fluid chamber, the method comprising the steps of:

• 1) determining a timing between two consecutive fluid droplets;
• 2) if the timing is smaller than a predetermined threshold, generating a first excitation waveform for a first fluid droplet and a second excitation waveform for a second fluid droplet, wherein the jetting pulse of the second excitation waveform at least partially overlaps the quenching pulse of the first excitation waveform;
• 3) otherwise, generating a first excitation waveform for a first fluid droplet and generating a second excitation waveform for a second fluid droplet after finishing the first excitation waveform.