| 摘要 |
An image forming apparatus includes a control portion that controls, before performing continuous image formation on a plurality of transfer materials, a voltage to be applied to a primary transfer member for primary transfer during the continuous image formation, and a correction unit that corrects the primary transfer voltage during the continuous image formation. The correction unit can perform a first mode for controlling the primary transfer voltage according to a target value determined by the control portion, and a second mode for changing the target value and controlling the primary transfer voltage according to the changed value. The control portion performs the first mode if a detected electric resistance is a first value or lower, or a second value, greater than the first value, or higher, and performs the second mode if the resistance is higher than the first value and lower than the second value. |
| 主权项 |
1. An image forming apparatus comprising:
an image bearing member configured to bear a toner image thereon; a movable intermediate transfer member configured to temporarily bear the toner image, the toner image being transferred from the image bearing member onto the intermediate transfer member in a transfer portion and then being transferred onto a recording material; a transfer member configured to electrostatically transfer the toner image formed on the image bearing member onto the intermediate transfer member in the transfer portion; a power supply configured to apply a voltage to the transfer member; a detection member configured to detect a current flowing through the transfer member during the application of the voltage to the transfer member; a control portion configured to control the voltage of the power supply in such a way that the current detected by the detection member has a predetermined target current value during continuous image formation; and a setting portion configured to, during the control of the voltage of the power supply by the control portion, (a) set the target current value to a first current value, in a case of a value related to an electric resistance obtained through the detection by the detection member being a first value or lower, (b) set the target current value to a correction current value based on the value related to the electric resistance, in a case of the value related to the electric resistance being greater than the first value and lower than a second value greater than the first value, and (c) set the target current value to a second current value lower than the first current value, in a case of the value related to the electric resistance being the second value or greater. |
