| abstract |
(57) Abstract: In an image forming apparatus for forming an image on a mount for pattern formation, the humidity of the mount housing is positively controlled to prevent paper curl and slip due to excessive surface water content. Transfer paper cassettes 30, 31, 32, 33 A humidity adjusting device including a humidity sensor 301, a dehumidifying heater 302, and a humidifier 303 is provided inside the dehumidifying heater 302 and the humidifier 30 according to the output of the humidity sensor 301. 3 is turned on and off to keep the humidity in the transfer paper cassette within a predetermined range. |