| 摘要 |
PURPOSE:To stabilize printing grade by always obtaining a constant printing dot diameter without being affected by atmospheric temp. such as room temp., by setting the bias temp. of a recording head at the emitting time of ink to temp. higher than the max. atmospheric temp. CONSTITUTION:When printing operation is started, the set value of a temp. setting device 15 is inputted to CPU 10 and the detection value from a temp. detector 7 is inputted to CPU 10 to be compared with the aforementioned set value. When detected temp. is low, a heater 8 is turned ON for a definite time to heat a recording head 6. When the detected temp. is high, printing is interrupted for a definite time to wait the decrease in the temp. of the recording head 6. Heating and cooling are appropriately repeated and, when the detected temp. reaches a set temp. range, printing is started. The bias temp. of the recording head 6 at the emitting time of ink is controlled while the above-mentioned process is repeated. Because the bias temp. is set to one higher than the max. atmospheric temp. and held to the set temp., the change in the viscosity of ink is suppressed to a small degree even when the atmospheric temp. changes and the stable emission of ink is obtained and a constant printing dot diameter is always formed and printing grade is enhanced. |
