An image forming system capable of producing a center-folded or saddle-stitched brochure having punched holes at identical positions between the front and back sides thereof even when a saddle-stitching or center-folding position is set to a location shifted from a sheet center position. A puncher punches holes in a sheet. A finisher folds a sheet bundle formed by sheets each having the holes punched therein. A console sets an adjustment value for adjusting a folding position at which the sheet bundle is folded by the finisher, according to a manual operation. When the adjustment value is larger than a reference value, the puncher determines a punching position with respect to a folding position having the adjustment value reflected thereon and punches the holes in the determined punching position.

A conveyance control unit is provided with a conveyance request unit configured to transmit a conveyance request signal to a paper conveyance device at a conveyance request timing corresponding to a processing cycle of a downstream paper processing device, a passage information reception unit configured to receive a paper passage signal indicating that paper has been sent out from the paper conveyance device, and the determination unit configured to determine whether a conveyance delay has occurred based on timing when the paper passage signal was received. The conveyance request unit is configured to transmit the conveyance request signal at the conveyance request timing corresponding to the next processing cycle when it is determined that a conveyance delay has not occurred, and the conveyance request unit is configured not to transmit the conveyance request signal at the conveyance request timing corresponding to the next processing cycle when it is determined that a conveyance delay has occurred.

The control section of the recording device can execute a power switching step of moving the carriage based on the reference movement amount M, a retry step of performing the power switching step with an amount obtained by subtracting an adjustment amount ma from the reference movement amount M after the adjustment as a reference movement amount M when the power transmission section is not switched from the power non-transmission state to the power transmission state as a result of the power switching step, and a reference movement amount correction step of holding an amount obtained by subtracting the adjustment amount mc from the reference movement amount M after the adjustment as a new reference movement amount M when the power transmission section is switched from the power non-transmission state to the power transmission state as a result of the retry step.