Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorShimpei Ishikawa
Life of this patent
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Abstract
A control unit can execute regulation control referred to as active transfer voltage control (ATVC) for setting a transfer voltage output from a second voltage unit to a transfer member so as to transfer a toner image from a photosensitive member to a transfer material based on an electric current value detected by a detection unit and a voltage value output from a voltage output unit. When changing a voltage value output from the voltage output unit during execution of the ATVC, the control unit interrupts execution of a predetermined operation of the ATVC in a predetermined time period including a point of time including when the voltage output from the voltage output unit is changed.
Claims19
An image forming apparatus comprising:
- a photosensitive member configured to bear a toner image;
- a charging member configured to charge the photosensitive member;
- a transfer member configured to form a transfer portion by abutting on the photosensitive member and to transfer the toner image borne by the photosensitive member to a transfer material at the transfer portion;
- a first voltage unit configured to output a voltage having a predetermined polarity to the charging member and the transfer member;
- a second voltage unit configured to be electrically connected to the first voltage unit and to output a voltage having an opposite polarity to that of the predetermined polarity output to the transfer member;
- a detection unit configured to detect an electric current flowing through the transfer member;
- and
- a control unit configured to control the first voltage unit and the second voltage unit,
- wherein the control unit applies the voltage having the predetermined polarity to the charging member, applies a voltage obtained by superimposing the voltage having the predetermined polarity on the voltage having the opposite polarity to the transfer member, and performs regulation control to set a transfer voltage to be output from the second voltage unit to the transfer member, to transfer a toner image from the photosensitive member to a transfer material based on an electric current value detected by the detection unit and a voltage value output from the second voltage unit by causing the first voltage unit and the second voltage unit to respectively output voltages, in a state in which a transfer material is not nipped by the transfer portion, and
- wherein, in a case where the control unit changes a voltage value output from the first voltage unit while performing the regulation control, the control unit does not reflect a detection result detected by the detection unit to the regulation control during a predetermined time period including a point of time when the voltage output from the first voltage unit is changed.
Dependencies are inferred from the claim text.