Patent ID: 9417606
Filing Date: 2016-08-16
CPC Classification: G03G

Claim Text:
1. An image forming apparatus comprising: a main assembly; an image bearing member configured to carry a toner image; a transfer member cooperative with said image bearing member to form a transfer portion to transfer a toner image onto a recording material passing through said transfer portion; a transferring voltage source configured to apply a voltage to said transfer member; a heating unit configured to heat the recording material having a transferred toner image; a detecting unit configured to detect a value relating to the amount of water vapor in said main assembly; a fan configured to adjust a flow rate in said main assembly, and a control unit configured to control a humidity decreasing operation for decreasing the amount of vapor produced in said main assembly; wherein when said control unit increases the rotational speed of said fan to effect the humidity decreasing operation on the basis of the amount of change of the value detected by said detecting unit, the value corresponding to the amount of the vapor produced by heating the recording material by said heating unit.