Liquid ejection apparatus

摘要

An ink jet printer includes an ejection unit including a nozzle which ejects a liquid containing a pigment; a cavity which communicates with the nozzle; and a piezoelectric element which is provided in the cavity, and a driving signal generation unit which generates a driving signal allowing the piezoelectric element to be displaced such that the cavity expands or is contracted. The ink jet printer includes a detection unit that detects a cycle of a residual vibration waveform of the piezoelectric element which is generated by the driving signal being applied to the piezoelectric element and indicates a value according to change of the pressure inside of the cavity and a determination unit that determines the pigment is settled based on the cycle of the residual vibration waveform detected by the detection unit.

主权项

1. A liquid ejection apparatus, comprising:
an ejection unit that includes a nozzle ejecting a liquid that contains a pigment, a pressure chamber communicating with the nozzle, and a piezoelectric element provided in the pressure chamber; a driving signal generation unit that generates a driving signal that allows the piezoelectric element to be displaced such that the pressure chamber expands or is contracted; a residual vibration detection unit that detects a cycle of a residual vibration waveform of the piezoelectric element that is generated by the driving signal being applied to the piezoelectric element and indicating a value according to change of pressure in the pressure chamber; and a determination unit that determines the pigment of the liquid is settled based on the cycle of the residual vibration waveform detected by the residual vibration detection unit, wherein: the liquid containing the pigment is a white ink jet ink for textile printing that contains a white pigment and a urethane resin, and an average particle size of the white pigment is greater than or equal to 2 and the average particle size of the urethane resin is smaller than or equal to 12.