Abstract: A method for collating a plurality of copies comprising advancing a group of bins in one direction for collating a selected number of copies, returning the bins in an opposite direction for collating the same number of copies after the advancing movement, repeating the advancing and returning movements alternately, detecting a change of the selected number of copies during the collating operation, and starting the collating operation from a specific standard bin in response to that detection.

Abstract: For a sorter with movable bins capable of sorting in both directions from the upper bin to the lower bin and from the lower bin to the upper bin corresponding to a selected number of copies for successive originals, an improved controlling method for the sorter provides for returning the bins to a selected position when the number of copies is changed from the one previously set.

Abstract: A copying apparatus having a power transmission means in which arranged between the plurality of driven means and the driving system is a power transmission control mechanism. Said power transmission control system is capable of reducing and absorbing the vibrations generated through the driving system and stably supplying the power to the plurality of driven means. Said power transmission control mechanism comprises a flange connected to said plurality of driven means, a flange connected to said driving system and an elastic member inserted beween said two flanges.