Image forming apparatus

Patent metadata

Field	Value
Publication number	US-2015338788-A1
Application number	US-201514721176-A
Country	US
Kind code	A1
Filing date	May 26, 2015
Priority date	May 26, 2014
Publication date	Nov 26, 2015
Grant date	—

Abstract

An image forming apparatus includes a transfer portion transferring a toner image to a sheet, a sheet guide portion guiding the sheet to the transfer portion. The sheet guide portion includes a resin member made of resin and a conductive member provided to be in contact with the sheet to which the toner image is being transferred by the transfer portion and on a surface of the resin member so as to be earthed through the resin member, and having a volume resistivity which is lower than that of the resin member.

First claim

What is claimed is:

1 . An image forming apparatus comprising:
a transfer portion transferring a toner image to a sheet; a sheet guide portion guiding the sheet to the transfer portion, the sheet guide portion including:
a resin member made of resin; and
a conductive portion provided to be in contact with the sheet to which the toner image is being transferred by the transfer portion and on the resin member so as to be earthed through the resin member, the conductive portion having lower volume resistivity than that of the resin member.

2 . The image forming apparatus according to claim 1 , wherein the conductive portion is pasted to the resin member by an adhesive portion.

3 . The image forming apparatus according to claim 1 , wherein the volume resistivity of the resin member is 1×10 10 Ω·m or more and 1×10 13 Ω·m or less.

4 . The image forming apparatus according to claim 1 , wherein the volume resistivity of the conductive portion is greater than zero and less than 1×10 7 Ω·m.

5 . The image forming apparatus according to claim 3 , wherein the volume resistivity of the conductive portion is greater than zero and less than 1×10 7 Ω·m.

6 . The image forming apparatus according to claim 1 , wherein the conductive portion is a film pasted on the resin member.

7 . The image forming apparatus according to claim 2 , wherein the adhesive portion is composed of an adhesive tape having electrical conductivity.

8 . The image forming apparatus according to claim 1 , wherein the resin member includes a surface, extending along a sheet conveying direction, on which the conductive portion is provided.

9 . The image forming apparatus according to claim 1 , wherein the conductive portion is a conductive coat applied on a surface of the resin member.

10 . The image forming apparatus according to claim 1 , wherein the transfer portion includes an intermediate transfer belt carrying a toner image and a transfer roller forming a transfer nip portion nipping a sheet together with the intermediate transfer belt and to which transfer bias is applied.

11 . The image forming apparatus according to claim 1 , wherein the transfer portion includes an intermediate transfer belt carrying a toner image and a transfer roller forming a transfer nip portion nipping a sheet together with the intermediate transfer belt and to which transfer bias is applied,
wherein the resin member is disposed on a same side with the intermediate transfer belt with respect to a conveying path through which the sheet is guided to the transfer portion, the resin member including a first surface whose extension line intersects with the intermediate transfer belt and a second surface provided downstream in a sheet conveying direction of the first surface and extending so as to be away, in a sheet thickness direction, from the extension line of the first surface as the second surface approaches to the intermediate transfer belt, and wherein the conductive portion is provided along the first and second surfaces.

12 . The image forming apparatus according to claim 1 , wherein the transfer portion includes an intermediate transfer belt carrying a toner image and a transfer roller forming a transfer nip portion nipping a sheet together with the intermediate transfer belt and to which transfer bias is applied,
wherein the conductive portion includes a first guide surface guiding a front end in a sheet conveying direction of the sheet to the intermediate transfer belt and a second guide surface provided downstream in the sheet conveying direction of the first guide surface and extending so as to be away, in a sheet thickness direction, from an extension line of the first guide surface as the second guide surface approaches to the intermediate transfer belt and guiding a rear end in the sheet conveying direction of the sheet, being transferred by the transfer portion, to the intermediate transfer belt.

Assignees

• Canon Kk

Inventors

• Tajiri Tsuyoshi

Classifications

• G03G15/00

  Apparatus for electrographic processes using a charge pattern (G03G16/00, G03G17/00 take precedence) · CPC title

• G03G15/2028 Primary

  with means for handling the copy material in the fixing nip, e.g. introduction guides, stripping means · CPC title

• G03G15/6558 Primary

  Feeding path after the copy sheet preparation and up to the transfer point, e.g. registering; Deskewing; Correct timing of sheet feeding to the transfer point · CPC title

• G03G21/16

  Mechanical means for facilitating the maintenance of the apparatus, e.g. modular arrangements · CPC title

• G03G15/165 Primary

  Arrangements for supporting or transporting the second base in the transfer area, e.g. guides · CPC title