| 摘要 |
PROBLEM TO BE SOLVED: To provide an inkjet image forming device which accurately detects the viscosity of ink. SOLUTION: The image forming device detects the viscosity of ink by a viscosity detector 90 by sucking the ink in a subtank 80 into the viscosity detector 90. The result of the viscosity detection is compared with a viscosity value Ns previously set as a stability limit values of printing. If N is less than Ns, the ink in the subtank 80 is not diluted by a diluent. In that case, a dilution pump 95 is driven so as to ensure that the diluent in a diluent tank 92 flows in the direction of an arrow E and the ink flowing into a diluent channel 93 in viscosity detection is returned to the subtank 80. If N is equal to or greater than Ns, the ink is diluted by injecting the diluent in the diluent tank 92 into the ink in the subtank 80. In that case, when the diluent is supplied to the subtank 80 from the diluent tank 92, the diluent is once flowed into the viscosity detector 90 and flowed out. COPYRIGHT: (C)2008,JPO&INPIT |
