Patent ID: 6957022

Claim:
An image forming apparatus comprising: a plurality of image carriers for carrying toner images, thereon, formed by an image forming process in operation thereof, said plurality of image carriers being disposed along a sheet transport direction; a transfer carrier for transporting a sheet recording medium attracting said sheet recording media thereon to transfer said toner images carried on said plurality of image carriers onto said sheet recording medium; a transfer voltage applying section for applying a transfer voltage to said sheet recording medium transported by said transfer carrier; a fixing device for fixing a toner image on said sheet recording medium transported by said transfer carrier, the fixing device being installed so as to be capable of moving toward outside of a side surface of the body of said image forming apparatus; a jam processing control section for detecting occurrence of a jam of said sheet recording medium in operation of said image forming process to process said sheet recording medium in said jam; and a sensor for measuring an environmental condition of a temperature or humidity in the working atmosphere thereof, wherein said jam processing control section, when detecting occurrence of said jam, ceases transportation of said sheet recording medium in said jam by said transfer carrier as a first stage to make it possible to remove said sheet recording medium in said jam; and, if a second sheet recording medium in transit when said jam occurs is detected by said transfer carrier, advances to a second stage and restarts transportation of said second sheet recording medium in transit using said transfer carrier to transport said second sheet recording medium to said fixing device and to stop it there, and said transfer voltage applying section, when said jam processing control section is at said second stage, controls a transfer voltage to be applied to said second sheet recording medium based on a measurement result of said sensor when said jam processing control section is at said same second stage.