Patent ID: 8755734
Filing Date: 2014-06-17
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a sheet feed unit that feeds a sheet to an image forming unit forming a toner image on the sheet; a fixing unit that fixes the toner image to the sheet; a re-transport unit that reverses the sheet with the toner image and re-transports the sheet to the image forming unit when forming an image on both sides of the sheet; a recognition unit that recognizes the number of sheets in a one-side image formation; a timer that detects passage of time; and a control unit that controls a sheet feed operation of the sheet feed unit based on the number of sheets recognized by the recognition unit, wherein, when starting the duplex image formation after the one-side image formation, in a case where the number of the sheets recognized by the recognition unit in the one-side image formation is less than a predetermined number, the control unit controls the sheet feed unit so as to start the sheet feed operation when passage of a first time is detected by the timer after the end of the sheet feed operation for feeding the last sheet in the one-side image formation, and in a case where the number of the sheets recognized by the recognition unit in the one-side image formation is greater than or equal to the predetermined number, the control unit controls the sheet feed unit so as to start the sheet feed operation when passage of a second time which is longer than the first time is detected by the timer after the end of the sheet feed operation for feeding the last sheet in the one-side image formation.