| 摘要 |
PROBLEM TO BE SOLVED: To easily judge the occurrence of a toner abnormally feeding state with a simple structure in its early stages at a low cost and to prevent the occurrence of a device breakage accident caused by toner leakage or toner clogging by detecting internal pressure in a gas feeding path for feeding gas supplied to a gas flow moving means from a gas supply means. SOLUTION: Recovered toner (t) recovered by a cleaning means 11 after forming an image and separated from waste toner (tt) by a toner classification device 12 and reutilized is fed in the elastic tube of the recycled toner feeding path 4a of a toner feeding path 4 into a hopper 2f and a container 2e while the internal pressure is detected by an internal pressure detection means 8 in the gas feeding path 7 for feeding air being the gas supplied to the powder screw pump of the gas flow moving means 5 from the air pump of the gas flow supply means 6. Thus, the recycled toner (t) is moved to a developing device 2 and fed, and the waste toner (tt) separated by the device 12 is stored in a waste toner container 17 and discarded. |
