Image forming apparatus

Claim 1

An image forming apparatus having: a photosensitive drum (2); an optical system (4, 5, 7, 6) for radiating light onto a document and guiding light reflected by the document to said photosensitive drum (2); discharger means (10) for discharging a surface of said photosensitive drum (2); charging means (11) for charging the surface of said photosensitive drum (2) after said photosensitive drum (2) is discharged; exposure means (8) for exposing the surface of said photosensitive drum (2) after said photosensitive drum (2) is charged; developing means (12) for visualizing an electrostatic latent image formed by said exposure means (8) on the surface of said photosensitive drum (2); transferring means (27) for transferring a visual image formed on the surface of said photosensitive drum (2) onto a paper sheet; separating means (28) for separating the paper sheet, onto which the visual image has been transferred, from said photosensitive drum (2); cleaning means (29) for cleaning said photosensitive drum (2); fixing means (35) for fixing the visual image transferred onto the paper sheet; and conveyor means (26, 30, 35, 37) for conveying the paper sheet separated from said photosensitive drum; characterized in that there is provided controlling means (161) for controlling said fixing means (35) and said conveyor means (26, 30, 35, 37) to perform preheating of said fixing means (35) and driving of said conveyor means (26, 30, 35, 37) for a predetermined time interval immediately after power is supplied, to stop said fixing means (35) and said conveyor means (26, 30, 35, 37) when preheating of said fixing means (35) is completed before the predetermined time interval has elapsed, and to continue operation of said conveyor means (26, 30, 35, 37) when a paper sheet is jammed in said paper conveyor means (26, 30, 35, 37), even if preheating of fixing means (35) is completed before the predetermined time interval has elapsed.