PURPOSE: To have distinct discrimination of copying sheets according to interruption from those which have lain since before interruption is made, by setting the home position to the final stage of bins at the selection time of interruption sort mode, and by controlling so that the sorting action within the number of possible volumes for interruption sort is made to the closely upper situated bin one after another.

CONSTITUTION: The Sort key 31 is turned on and the sort mode selection is made to perform copying action, and when the Interrupt key 33 is turned on, the output from an AND circuit 68 will become at H level. A multiplexer 65 displays the data Db applied to its input terminal A on a display 66, i.e. the data (interrupt sort possible volume data) obtained from the total number of bins subtracted by the data Dm about the number of copied sheets, entered in a max. value memory 64, added with one. The operator shall operate a Ten key 37 according to desired number of volumen while watching the display currently given, and the data is entered in a number entry memory 62, whereafter the Print key 35 is pushed. Now a comparative operational circuit 51 will set the lowermost bin to the home position, and then bin selection is performed upward one stage another.