Image forming apparatus and control method thereof

摘要

An image forming apparatus which conveys waste toner includes a buffer portion (101) capable of temporarily containing the waste toner and a waste toner container (102) capable of containing the waste toner. The waste toner is contained preferably in the waste toner container (102) rather than in the buffer portion (101). When the waste toner container (102) is filled with waste toner, the waste toner can be temporarily contained in the buffer portion (101). An engine controller detects whether the buffer portion (101) is filled with the waste toner or not through a detection sensor. If the buffer portion (101) is full of waste toner, the engine controller stops both the conveyance of waste toner towards the buffer portion (101) via a first pipe (103) and any further image forming operation.