Data processing apparatus, image recording apparatus, method of controlling data processing apparatus, method of controlling image recording apparatus and storage medium

Abstract

An image forming apparatus is connectable to a sheet processing apparatus having a plurality of stacking units for stacking recording sheets and capable of discharging recording sheets selectively to the plurality of stacking units. The image forming apparatus includes a controller for controlling a discharge operation of remaining recording sheets of a first job if a job stacking unit, stacking the recording sheets of the first job, becomes nonusable by the recording sheets of the first job during the discharge operation. The controller permits the discharge operation of the remaining recording sheets to an adjacent stacking unit, which is adjacent to the nonusable job stacking unit, even if the recording sheets have already begun stacking in another stacking unit of the plurality of stacking units, which is different from both of the nonusable job stacking unit and the adjacent stacking unit, when the adjacent stacking unit is not usable by other recording sheets, which are different from the recording sheets of the first job. The controller inhibits the discharge operation of the remaining recording sheets even if the recording sheets have not been stacked in the another stacking unit when the adjacent stacking unit is nonusable by the other recording sheets.