| 摘要 |
PURPOSE:To lessen maloperation of display on shortage of ink as well as prevent the drooping of liquid in the nozzle portion by a method in which the position of a pattern coding plate is detected by a pattern code detector to detect the residual amount of ink in a multiple stage. CONSTITUTION:As the amount of ink is reduced, a pattern coding plate 5 is moved downwards, and magnetic materials 11 and 12 are detected by magnetic sensors 13 and 14. By displaying the levels of each ink at four stages of full, medium, slightly small and lack, the residual amounts of ink can be detected and displayed at the four stages by two sensors. In the same way, when n-numbers of sensors are used, the display of ink residual amount at 2<n> stages can be performed. Since the detection and display of ink levels at multiple stage are permitted, the maloperation of ink shortage display can be prevented as compared with the conventional cases where only ink shortage is displayed. |
