Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorTomohiro Saito
Life of this patent
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Abstract
An image forming apparatus includes an image bearing member, a transfer member, an applying portion, a detecting portion, and a controller. In a case where an adjusting operation is executed from reception of a start signal of image formation to a start of transfer of an image on a first sheet in the transfer portion, the controller controls the applying portion so that a second test bias is higher in absolute value of a voltage than a first test bias and controls the applying portion so that a time in which the first test bias is applied to the transfer portion is set to a first time and so that a time in which the second test bias is applied to the transfer portion is set to a second time longer than the first time.
Claims11
An image forming apparatus comprising:
- an image bearing member configured to bear a toner image;
- a transfer member configured to form a transfer portion where the toner image is transferred from the image bearing member onto a toner image receiving member;
- an applying portion configured to apply a bias to the transfer portion;
- a detecting portion configured to detect a voltage applied to the transfer portion or a current flowing through the transfer portion when the bias is applied to the transfer portion by the applying portion;
- and
- a controller capable of controlling the applying portion so as to execute an adjusting operation in which a transfer bias applied to the transfer portion by the applying portion during transfer is set on the basis of a detection result of the detecting portion when a plurality of test biases including a first test bias and a second test bias are applied to the transfer portion by the applying portion during non-image formation,
- wherein in a case where the adjusting operation is executed from reception of a start signal of image formation to a start of transfer of an image on a first sheet in the transfer portion, the controller is configured to control the applying portion so that the second test bias is higher in absolute value of a voltage than that of the first test bias and is configured to control the applying portion so that a time in which the first test bias is applied to the transfer portion is set to a first time and so that a time in which the second test bias is applied to the transfer portion is set to a second time longer than the first time.
Dependencies are inferred from the claim text.