Patent ID: 7417758

Claim:
An image forming apparatus capable of having attached thereto a post-processing device that performs a post-process on sheets with images formed thereon, comprising: a first conveying device that conveys a first type of sheet; an image forming device that forms an image on the first type of sheet; a sheet supply tray on which a second type of sheet is placed, the second type of sheet to be inserted at a predetermined position in a bundle of the first type of sheets on which images have been formed; a second conveying device that conveys the second type of sheet from said sheet supply tray; an input device that inputs an instruction as to which end of the first and the second type of sheets is to be subjected to the post-process; and a placing direction informing device that informs a placing direction in which the second type of sheet is to be placed on said sheet supply tray, according to the instruction input by said input device.