| 摘要 |
PURPOSE:To make it possible that any person manages easily the state of an electrostatic recording machine, by detecting easily the replacement time or the like of a photosensitive drum of the electrostatic recording machine in accordance with the number of replacements of developer cassettes. CONSTITUTION:A projecting part 46 is provided in the right of a toner hopper 12, and a switch 14 is provided in the right of a hopper attaching part 43. This switch 14 is depressed by the projecting part 46 of the toner hopper 12 and is closed when the toner hopper 12 is set to the hopper attaching part 43, but the switch 14 is raised and is opened when the toner hopper 12 is detached from the hopper attaching part 43. Each time the toner hopper 12 is attached to the hopper attaching part 43, the counted value of a counting means is counted up. Thus, the number of replacements of the toner hopper 12 is counted automatically, and the counted output is displayed on a display device 56. |
