| 摘要 |
PURPOSE:To prevent degradation of print quality due to deterioration of ink at detecting remaining quantity of ink and due to adverse effect of pressing force of a spring. CONSTITUTION:An adjustment screw (conductive member) 27 is provided movably interlocking with rock of a diaphragm 30. A pair of armatures 23 and 24 having contacts 23b and 24b at tips 23a and 24a are provided. The armatures 23 and 24 are supported in an cantilevered manner at base ends 23c and 24c and connected to an ink remaining quantity detection circuit C. When remaining quantity of ink decreases, the diaphragm 30 rocks so as to move the adjustment screw 27. When the remaining quantity of ink becomes below a fixed quantity, it comes in contact with the contacts 23b and 24b so as to make conductance between them, and the detection circuit C detects that the remaining quantity of ink has become below the fixed quantity. |
