Developer circulator unit of the images forming apparatus.

摘要

A developer circular unit is detachably set in a copier or a copier type printer (9) which print on images on a paper sheet with toner (56). The unit includes at least a developing device (16), a cleaner (20), and a developer conveying device having a pipe (62) communicated with both the cleaner and the developing device and a toner flowing-back preventing mechanism (66, 68). The action of the mechanism is automatically released by the first set of the unit in the copier or printer and/or the first use of the copier or printer after that first set.