Guide member and image forming apparatus comprising the same
First Claim
Patent Images
1. An image forming apparatus comprising:
- a photosensitive member on which an electrostatic latent image is to be formed;
a charging member configured to charge the photosensitive member;
a developing member configured to develop the electrostatic latent image formed on the photosensitive member with toner charged to a predetermined polarity;
a transfer member configured to form a transfer area with the photosensitive member and transfer a toner image from the photosensitive member onto a recording material in the transfer area;
a first power source configured to apply a voltage of a polarity opposite to the predetermined polarity to the transfer member;
a guide member located upstream of the transfer area in a direction in which the recording material is conveyed, and configured to contact a back surface of the conveyed recording material to guide the recording material;
a second power source configured to apply the voltage of the polarity opposite to the predetermined polarity to the guide member; and
a pair of conveying rollers located upstream of the guide member in the direction in which the recording material is conveyed, and configured to convey the recording material toward the transfer area,wherein the guide member includes a guide region configured to contact the back surface of the recording material, and the guide region is entirely located on a side of the photosensitive member of a common imaginary tangent line in a developing area formed by the photosensitive member and the developing member, andwherein at least a part of the guide member protrudes toward the developing member beyond an imaginary line at a conveyance nip area formed by the pair of conveying rollers.
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Abstract
There is provided an image forming apparatus including a configuration in which a voltage of a polarity opposite to a toner charging polarity is applied. In the image forming apparatus, a guide region of a pre-transfer guide is located on a photosensitive drum side with respect to a common tangent line of a photosensitive drum and a development roller to reduce contamination of the pre-transfer guide and prevent contamination of recording materials.
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Citations
8 Claims
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1. An image forming apparatus comprising:
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a photosensitive member on which an electrostatic latent image is to be formed; a charging member configured to charge the photosensitive member; a developing member configured to develop the electrostatic latent image formed on the photosensitive member with toner charged to a predetermined polarity; a transfer member configured to form a transfer area with the photosensitive member and transfer a toner image from the photosensitive member onto a recording material in the transfer area; a first power source configured to apply a voltage of a polarity opposite to the predetermined polarity to the transfer member; a guide member located upstream of the transfer area in a direction in which the recording material is conveyed, and configured to contact a back surface of the conveyed recording material to guide the recording material; a second power source configured to apply the voltage of the polarity opposite to the predetermined polarity to the guide member; and a pair of conveying rollers located upstream of the guide member in the direction in which the recording material is conveyed, and configured to convey the recording material toward the transfer area, wherein the guide member includes a guide region configured to contact the back surface of the recording material, and the guide region is entirely located on a side of the photosensitive member of a common imaginary tangent line in a developing area formed by the photosensitive member and the developing member, and wherein at least a part of the guide member protrudes toward the developing member beyond an imaginary line at a conveyance nip area formed by the pair of conveying rollers. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification