Two-sided recording apparatus.

摘要

An automatic two-sided recording apparatus having an image forming station to form an image on a recording sheet and a sheet feeder to feed the recording sheets onto the station, includes an intermediate stacker having an inlet through which a recording sheet whose one side has been subjected to recording is stacked thereon by a switchback member provided adjacent to the inlet. The inlet is used also an outlet through which the recording sheet is fed out for recording on the other side thereof by the switchback member through a conveyor. The apparatus further includes a controller that switches between a stackless mode in which the switchback member feeds in the recording sheets the stacker and feeds out onto the station without stacking in the stacker, and a stack mode in which the switchback member feeds in and feeds out from the stacker onto the station after stacking in the stacker. The apparatus further includes a measuring member to measure one copy cycle time in the course of an image forming on one side. The controller determines the number of recording sheets to be handled in the stackless mode and that of recording sheets to be handled in the stack mode, based on the copy cycle time measured and a preset copy quantity, and switches the modes in accordance with the determined number of sheets.