| 摘要 |
PURPOSE:To detect the powder filling state of a recovering vessel easily and precisely before and after setting the vessel with a simple constitution by detecting the position of a receiving tray on which the recovering vessel is set up. CONSTITUTION:When the recovering vessel 11 is set up on the receiving tray 12 to be elastically excited upwards by a compressing spring 15 and vertically moved, a part of light between the light emitting and receiving elements of a photocoupler 16 is partially shielded by a shielding plate 17 unitedly molded by the tray 12. When recovery toner 14 is recovered to the vessel 11 and the vessel 11 is filled with the toner, light between the light emitting and receiving elements of the coupler 16 is completely shielded by the plate 17 and the arrival of the tray 12 at the most-descended position is detected. When the vessel 11 is not set up on the tray 12, light is not shielded at all by the shielding plate 17 and the most-ascended position of the tray 12 is detected on the basis of a detecting signal through the photocoupler 16. Consequently, the powder filling state in the recovery vessel before or after setting the recovering vessel can be easily and precisely detected with a simple constitution. |
