Patent ID: 6050665
Filing Date: 2000-04-18
Classification: B41J

Abstract:
A printer having a device for automatically adjusting the drive voltage of a print head according to a predetermined rank characteristic of the head, the adjusting device comprising:a signal input line over which signals are inputted to the print head;a delay time detection line connected to the signal input line and including a delay circuit having at least one capacitor and at least one resistor passing the signals therethrough, resulting in a delay signal corresponding to the rank characteristic of the print head;a control unit, responsive to the delay signal furnished to the control unit from the delay time detection line, that distinguishes the corresponding rank characteristic of the print head, the control unit includesa) an output unit that outputs a distinction signal over the signal input line;b) a detection unit that receives the delay signal and compares the delay signal to the distinction signal to detect the delay time associated with the delay signal; andc) a distinguishing unit that distinguishes the rank characteristic of the print head based on the delay time detected by the detection unit.