| 摘要 |
PURPOSE:To restrict a volume of bubble and air molten in the ink liquid to a value less than a specified value and to assure a safe operation of injection by a method wherein there are provided a bubble detector device and an agitator device to promote a collection and removal of air bubble. CONSTITUTION:Since motional impedances of electric strain vibratory element 53, a vibratory plate 54 and ink liquid chamber 57 are varied when air bubbles are mixed in the ink liquid chamber 57, the variation is sensed by a head driving part and a sensing a part in the bubble sensor circuit 4, the control circuit 5 is energized to operate an agitating device 7. The bubble collection device 6 always operates to remove the bubbles, the bubbles are sensed in the head 2 to operate the agitating device 7 and thereby an efficient collection or removal of air bubbles may be performed. |
