An image forming apparatus includes a drive motor, a transmission switching portion, a conveying processing portion, and an abnormality determination processing portion. The conveying processing portion drives the drive motor while the image forming portion is not executing an image forming process for forming an image on a sheet, and executes a lift raising process for switching the transmission switching portion to a transmission state in which the driving force of the drive motor is transmitted to the lift mechanism. The abnormality determination processing portion determines absence or presence of a sheet conveying abnormality on a conveying path along which the sheet is conveyed by the conveying rollers when the lift raising process is executed by the conveying processing portion without executing an image forming process in which an image is formed on the sheet by the image forming portion.

Disclosed is a sheet processing apparatus that includes: a stack tray having a stacking surface configured to stack the sheet bundle, a sensor configured to detect a height of an uppermost sheet of a sheet bundle stacked on the stacking surface, a lifting mechanism configured to lift up and down the stack tray based on an output of the sensor, a pressing member having a contact portion configured to elastically deform and contact an upper surface of the sheet bundle abutted against the abutting surface, wherein the control unit is configured to, while a plurality of sheet bundles composed of predetermined sheets are being continuously discharged, and in case the sheet bundle stacked on the stacking surface is removed such that the contact portion of the pressing member at the pressing position becomes separated from the stacking surface, repeatedly lift up the stack tray by a predetermined amount in response to a rotation command of the pressing member, in order to prevent the pressing member from being sandwiched between the stack tray and the abutting surface.

A laminating device including: a laminator that performs lamination processing of laminating a film on a recording medium on which image formation has been performed; and a first hardware processor that: acquires sheet characteristic information corresponding to smoothness of the recording medium; and controls a conveyance speed in the laminator based on the acquired sheet characteristic information.