Paper feeding apparatus and image forming apparatus

An image forming apparatus comprising:

• a tray that can place a sheet of paper thereon;
• a delivery roller that delivers the sheet of paper placed on the tray;
• a paper feeding roller that feeds the delivered sheet of paper to a conveyance path;
• a guide member that guides the sheet of paper delivered from the tray toward the paper feeding roller, the guide member being provided to be inclined upward toward the paper feeding roller;
• a lifting/lowering mechanism capable of changing a height of the tray;
• a first detector that detects the sheet of paper fed by the paper feeding roller, the first detector being arranged on a downstream side of the paper feeding roller;
• and
• a controller that controls the paper feeding roller and the lifting/lowering mechanism, wherein
• the controller
• executes paper feeding processing of feeding the sheet of paper delivered from the tray to the conveyance path by rotating the paper feeding roller,
• executes, during the paper feeding processing, retry processing of resuming the paper feeding processing after stopping the paper feeding processing when the fed sheet of paper is not detected by the first detector, and
• executes, during the retry processing, lifting and lowering processing of lifting and lowering the tray within a predetermined range after stopping the paper feeding processing and before resuming the paper feeding processing, and
• the predetermined range is a range in which an uppermost sheet of paper placed on the tray can abut on the guide member when the uppermost sheet of paper is delivered by the delivery roller.