Copying machine operable in simultaneous multi-color mode

摘要

A copying machine with plural developing units being capable of performing at least one edition mode and a simultaneous multi-mode in which the developing unit is switched from one to another on the way through one copying action is disclosed. In the simultaneous multi-mode, the position at which the developing unit is to be switched is designated by a position designation device such as keys provided on an operation panel and/or an editor, if connected to the copying machine. In this case, only one coordinate of the designated position in the sub-scan direction is employed to designate the switching position for the developing unit.