| 摘要 |
PURPOSE:To reduce irregularity in nozzle diameter and the change in the amount of bias due to temperature change, etc. and the amount of strain in a titled device of electric charge bias type by changing the amount to correct the strain in bias drops in accordance with the output signal of a means to detect pump pressure. CONSTITUTION:When print instruction issued, bias amount control is made. Next, it is judged whether or not the output of a pressure detection circuit 44 of a pressure pump 40 for ink is 1. At this time an accumulator 41 of air type is used, and if the ink level in the accumulator 41 is at a specified level, the detection circuit output becomes 1, and if it is below the specified level, the output becomes 0. As a result L of the correction table is specified that is made to correct the effects of the forerunning five drops and trailing two drops, if the detection output is 1, and if the output is 0, H of the correction table is specified. With this setup, strain correction is carried out according to the specified correction table. |
