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US 5,678,149 AGranted
Image forming apparatus
AssigneeCanon Kabushiki Kaisha
InventorsNobuhiko Takekoshi, Rie Takekoshi
Life of this patent
Estimating the term…
Abstract
The present invention provides an image forming apparatus which comprises an image bearing member, a recording material bearing member for holding and conveying a recording material to a transfer portion, a transfer charge member for transferring an image from the image bearing member to the recording material born by the recording material bearing member, and an urging means for urging the rear surface of the recording material bearing member in the vicinity of the transfer portion. The transfer charge member being contacted with a rear surface of the recording material bearing member opposite to a front surface on which the recording material is held at the transfer portion.
Claims47
An image forming apparatus comprising:
- an image bearing member;
- a recording material bearing member for bearing and conveying a recording material to a transfer portion;
- a transfer charge member for transferring an image from said image bearing member to the recording material born by said recording material bearing member, said transfer charge member being contacted with a rear surface of said recording material bearing member opposite to a front surface on which the recording material is born at said transfer portion;
- and
- an urging means for urging said rear surface of said recording material bearing member in the vicinity of said transfer portion;
- wherein when a tangential line tangent to said image bearing member is drawn at a position where said transfer charge member is urged against said image bearing member via said recording material bearing member, said image bearing member and a position where said recording material bearing member is urged by said urging means are situated on the same side with respect to said tangential line.
3 more elements
An image forming apparatus comprising:
- an image bearing member;
- a recording material bearing member for bearing and conveying a recording material to a transfer portion, said recording material bearing member being a belt supported by a plurality of rollers;
- a transfer charge member for transferring an image from said image bearing member to the recording material held by said recording material bearing member, said transfer charge member being contacted with a rear surface of said recording material bearing member opposite to a front surface on which the recording material is born at said transfer portion;
- and
- an upstream urging member disposed in the vicinity of said transfer portion and upstream of said transfer portion in a shifting direction of said recording material bearing member and adapted to urge said rear surface of said recording material bearing member;
- wherein a position where said recording material bearing member is urged by said upstream urging member is protruded above a line connecting between a position where said image bearing member is urged by said transfer charge member via said recording material bearing member and a support finish position where the support of said recording material bearing member by said roller is finished upstream of said transfer portion in the shifting direction of said recording material bearing member.
3 more elements
An image forming apparatus comprising:
- an image bearing member;
- a recording material bearing member for bearing and conveying a recording material to a transfer portion, said recording material bearing member being a belt supported by a plurality of rollers;
- a transfer charge member for transferring an image from said image bearing member to the recording material born by said recording material bearing member, said transfer charge member being contacted with a rear surface of said recording material bearing member opposite to a front surface on which the recording material is born at said transfer portion;
- and
- a downstream urging member disposed in the vicinity of said transfer portion and downstream of said transfer portion in a shifting direction of said recording material bearing member for urging said rear surface of said recording material bearing member;
- wherein a position where said recording material bearing member is urged by said downstream urging member is protruded above a line connecting between a position where said image bearing member is urged by said transfer charge member via said recording material bearing member and a support start position where the support of said recording material bearing member by said roller is started downstream of said transfer portion in the shifting direction of said recording material bearing member.
3 more elements
Dependencies are inferred from the claim text.