Patent ID: 8746826

Claim:
A device for managing a piezo inkjet head, comprising: a piezo actuator that is connected to an inkjet head to generate pressure; a driver that controls a driving of the piezo actuator; a controller that determines a signal generated from the piezo actuator as a reference signal in a state in which bubbles are not introduced into the inkjet head; and a storage unit that stores the signal determined as the reference signal in the controller, wherein the controller calculates a difference between the signal generated from the piezo actuator and the reference signal stored in the storage unit to generate a detection signal and determines a state of the inkjet head according to whether amplitude and/or a frequency of the detection signal is in a predetermined range, and wherein the controller calculates the frequency of the detection signal by dividing a temporal length of the generated detection signal by the number of times when a phase of the detection signal is charged from a positive number to a negative number or from a negative number to a positive number.