Image forming apparatus

An image forming apparatus comprising:

• an image bearing member configured to bear a toner image;
• a transfer member abutting on the image bearing member and configured to transfer a toner image to a transfer material from the image bearing member;
• a power source configured to apply voltage to the transfer member;
• a detection unit configured to detect electric current flowing in the transfer member when voltage is applied to the transfer member from the power source;
• a fixing unit configured to fix a toner image to a transfer material by heating the transfer material to which a toner image has been transferred;
• and
• a control unit configured to execute dehumidification control for dehumidifying the fixing unit,
• wherein the control unit executes the dehumidification control, in a case where a second current value that is detected by the detection unit when voltage is applied to the transfer member from the power source in a state where a transfer material is in contact with the fixing unit and the transfer member is greater than a first current value that is detected by the detection unit when voltage is applied to the transfer member from the power source before the transfer material reaches a position where the transfer member abuts on the image bearing member by a predetermined value or more.

An image forming apparatus comprising:

• an image bearing member configured to bear a toner image;
• a transfer member abutting on the image bearing member and configured to transfer a toner image to a transfer material from the image bearing member;
• a power source configured to apply voltage to the transfer member;
• a detection unit configured to detect voltage applied to the transfer member from the power source when electric current flows in the transfer member;
• a fixing unit configured to fix a toner image to a transfer material by heating the transfer material to which a toner image has been transferred by a heating unit;
• and
• a control unit configured to control the heating unit to heat the fixing unit;
• wherein, before a transfer material reaches the fixing unit, the detection unit detects a first voltage applied to the transfer member from the power source to cause a predetermined electric current to flow in the transfer member, and detects a second voltage applied to the transfer member from the power source to cause a predetermined electric current to flow in the transfer member in a state where a transfer material is in contact with the fixing unit and the transfer member, and
• wherein, in a case where the second voltage is lower than the first voltage by a predetermined value or more, the control unit controls the heating unit to heat the fixing unit in a state where conveyance of a subsequent transfer material stops after a transfer material that is in contact with the fixing unit is discharged from the fixing unit.