Inkjet printers with excellent print quality

摘要

The present invention relates to an inkjet printer having excellent print quality. In particular, even when the temperature and viscosity of the ink are changed according to the working environment of the inkjet printer, uniform printing characteristics can be obtained by constantly controlling the viscosity of the ink passing through the spray nozzle head. An ink jet printer having a carrier provided with a spray nozzle head for spraying a colorant onto an object to be printed, an auxiliary ink tank for supplying ink to the spray nozzle head, and a main ink tank for replenishing ink in the auxiliary ink tank An inkjet printer comprising: a temperature control unit installed on the spray nozzle head or the carrier; A first crystal oscillator and a second crystal oscillator respectively disposed on the lower inner surface and the upper inner surface of the auxiliary ink tank; A first oscillation circuit portion and a second oscillation circuit portion for oscillating the first crystal oscillator and the second crystal oscillator, respectively; A first frequency detector and a second frequency detector which respectively detect the impedance value and the resonance frequency value of the first crystal oscillator and the second crystal oscillator; A viscosity measuring unit for measuring the viscosity of the ink filled in the auxiliary ink tank by the respective resonance frequency detection values of the first crystal oscillator and the second crystal oscillator detected by the first and second frequency detectors; ; It characterized in that it comprises; a temperature control unit for controlling the temperature control unit according to the viscosity of the ink measured by the viscosity measuring unit.