Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorYutaka KAKEHI
Life of this patent
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Abstract
An outer roller is provided at a position offset upstream, in a rotation direction of an image carrying belt, of an inner roller. The inner and outer rollers are provided across the image carrying belt and form a transfer nip portion nipping and conveying a recording medium. A press member presses the image carrying belt from an inner circumferential side at upstream of the inner roller. The press member is provided such that a length along a belt surface of the image carrying belt between a downstream end of a part thereof in contact with the image carrying belt and an upstream end of the transfer nip portion is shorter than a length of an end margin formed on an upstream end area of the recording medium.
Claims11
An image forming apparatus comprising:
- an endless image carrying belt rotating while carrying a toner image on a surface thereof;
- an inner roller provided on an inner circumferential side of the image carrying belt and being in contact with the image carrying belt;
- an outer roller provided on a side opposite from the inner roller across the image carrying belt at a position offset to upstream in a rotation direction of the image carrying belt from the inner roller and forming a transfer nip portion where a recording medium is nipped and conveyed;
- a power supply applying voltage between the inner and outer rollers to transfer the toner image from the image carrying belt to the recording medium conveyed through the transfer nip portion;
- and
- a press member provided upstream, in the rotation direction of the image carrying belt, of the inner roller and pressing the image carrying belt from the inner circumferential side of the belt, the press member configured such that a length along a belt surface of the image carrying belt between a downstream end of a part of the press member in contact with the image carrying belt and an upstream end of the transfer nip portion is shorter than a length of an end margin formed out of an image forming area and formed on an upstream end area of a surface of the recording medium in a recording medium conveying direction.
Dependencies are inferred from the claim text.