| 摘要 |
PURPOSE:To know the approximate replacing time of a photosensitive body by arranging a device for displaying the number of times in the replacement of used developer recovery boxes to display the life of the photosensitive body in accordance with the number of times of replacement. CONSTITUTION:At every filling of developer recovered in a developer recovery box 13, the box is recovered in accordance with the display of its filling. At the time of recovery of the box 13, a lever 15 is disengaged from the box 13 and abutted upon rachet display plate 16 to display the number of times in the recovery of boxes 13 by the rotational frequency of the display plate 16. Since the recovered quantity of the developer may be approximately proportional to the number of copies, the life of the photosensitive body can be estimated by the approximate value. |
