Charge-eliminating apparatus, image forming system

A charge-eliminating apparatus configured to perform charge elimination on a sheet onto which a toner image is transferred at a transfer portion, the charge-eliminating apparatus comprising:

• a charge-eliminating member configured to be brought into contact with the sheet and perform charge elimination on the sheet;
• a power source configured to apply a voltage to the charge-eliminating member;
• a contacting member configured to be brought into contact with the sheet downstream of the transfer portion in a sheet-conveying direction;
• a detection circuit configured to detect a voltage applied to the contacting member or a current flowing in the contacting member;
• and
• a controlling unit configured to control the power source,
• wherein the controlling unit determines a value of the voltage applied from the power source to the charge-eliminating member during charge elimination on the sheet by the charge-eliminating member based on a detection result from the detection circuit during passage of the sheet along the contacting member, and
• wherein the value of the voltage applied to the charge-eliminating member is changed based on a detection result from the detection circuit, and a value of the voltage applied to the contacting member is preset regardless of the detection result from the detection circuit.

A charge-eliminating apparatus configured to perform charge elimination on a sheet onto which a toner image is transferred at a transfer portion, the charge-eliminating apparatus comprising:

• a charge-eliminating member configured to be brought into contact with the sheet and perform charge elimination on the sheet;
• a power source configured to apply a voltage to the charge-eliminating member;
• a detection circuit configured to detect the voltage applied to the charge-eliminating member or a current flowing in the charge-eliminating member;
• and
• a controlling unit configured to control the power source,
• wherein the controlling unit performs:
• a first mode of applying the voltage from the power source to the charge-eliminating member using constant voltage control to cause the charge-eliminating member to perform charge elimination on the sheet;
• and
• a second mode of applying the voltage from the power source to the charge-eliminating member using constant current control and determining a value of the voltage applied from the power source to the charge-eliminating member in the first mode based on a detection result from the detection circuit during passage of the sheet through the charge-eliminating member.

A charge-eliminating apparatus configured to perform charge elimination on a sheet onto which a toner image is transferred at a transfer portion, the charge-eliminating apparatus comprising:

• a charge-eliminating member configured to be brought into contact with the sheet and perform charge elimination on the sheet;
• a power source configured to apply a voltage to the charge-eliminating member;
• a detection circuit configured to detect the voltage applied to the charge-eliminating member or a current flowing in the charge-eliminating member;
• and
• a controlling unit configured to control the power source and perform:
• a first mode of applying the voltage from the power source to the charge-eliminating member to cause the charge-eliminating member to perform charge elimination on the sheet;
• and
• a second mode of determining a value of the voltage applied from the power source to the charge-eliminating member in the first mode based on a detection result from the detection circuit during passage of the sheet through the charge-eliminating member,
• wherein the value of the voltage applied from the power source to the charge-eliminating member in the first mode is changed based on the detection result from the detection circuit in the second mode, and
• wherein the value of the voltage applied from the power source to the charge-eliminating member in the second mode is preset regardless of the detection result from the detection circuit.