| 摘要 |
PURPOSE:To enable an ink residual amount to be certainly detected by a method wherein a pair of electrodes are conducted to each other through a one side foam material, ink existing in a pipe, and another side foam material. CONSTITUTION:Electrodes 10a, 10b are conducted to each other through a foam material 8a, ink in a pipe 9, and a foam material 8b. When the ink is consumed and the ink in the foam material 8a is gone, circulation of the ink via a pipe comes not to be performed, and a current between the electrodes 10a, 10b is intercepted by the pipe 9 having an insulating property. Said no conduction between the electrodes 10a, 10b is detected with a detection circuit, and the condition is regarded as 'no ink'. Since the ink remains yet in the foam material 8b, printing can be a little performed yet after display of 'no ink'. Further since how degree printing can be performed to is determined by a volume of a second chamber 6b, when a residual amount is required to be strictly detected, the second chamber 6b should preferably be made as small in volume as possible. |
