Image forming apparatus and process unit

Patent metadata

Field	Value
Publication number	US-9772601-B2
Application number	US-201615223189-A
Country	US
Kind code	B2
Filing date	Jul 29, 2016
Priority date	Jul 29, 2015
Publication date	Sep 26, 2017
Grant date	Sep 26, 2017

Abstract

A process unit includes a rotatable image bearer, an optical writing head to expose the image bearer within an maximum exposure range in an axial direction of the image bearer, a developer bearer, spacers disposed in axial end portions of the image bearer to determine a position of the optical writing head relative to the image bearer and slidingly contact the image bearer, a cleaner disposed downstream from the developer bearer in an image bearer rotation direction, and a remover to slidingly contact the axial end portion of the image bearer to remove a substance adhering thereto. In the axial direction, inner ends of the spacers are positioned inside a toner layer range of the developer bearer extending beyond a largest sheet width. The remover is disposed downstream from the cleaner and crossing a line extending from the inner end of the spacer perpendicularly to the axial direction.

First claim

What is claimed is:

1. A process unit comprising:
an image bearer to rotate and bear an electrostatic latent image and a toner image;
an optical writing head to expose a surface of the image bearer inside a maximum exposure range in an axial direction of the image bearer to form the electrostatic latent image, the maximum exposure range within a largest sheet width, within which a sheet is fed in the process unit;
a developer bearer disposed opposite the image bearer to supply toner to the image bearer, the developer bearer having a toner layer range extending beyond the largest sheet width in the axial direction;
a pair of spacers disposed in axial end portions of the image bearer and interposed between the optical writing head and the image bearer to determine a position of the optical writing head relative to the image bearer, the spacers having inner ends facing each other and positioned inside the toner layer range in the axial direction, the spacers to slidingly contact the surface of the image bearer;
a cleaner disposed downstream from the developer bearer in a rotation direction of the image bearer to remove the toner from the surface of the image bearer; and
a remover disposed downstream from the cleaner in the rotation direction of the image bearer and on at least one of the axial end portions of the image bearer,
the remover disposed crossing an extension line (EX1) extending from the inner end of one of the spacers in a direction perpendicular to the axial direction,
the remover to slidingly contact the surface of the image bearer to remove a residual substance from the surface of the image bearer, the residual substance including the toner.

2. The process unit according to claim 1 , wherein the remover is disposed outside the largest sheet width in the axial direction.

3. The process unit according to claim 1 , wherein an inner end of the remover is disposed outside the maximum exposure range and inside the largest sheet width in the axial direction.

4. The process unit according to claim 1 , wherein each of the spacers includes:
an inclined portion inclined relative to the axial direction and extending from the inner end of the spacer; and
a linear portion extending in the rotation direction of the image bearer, the linear portion disposed outside the inclined portion in the axial direction, and
wherein the remover is disposed such that an extension line (B 1 ) crosses an inner portion of the inclined portion in the axial direction, the extension line (B 1 ) extending toward the spacer in the rotation direction of the image bearer from an outer end of the remover in the axial direction.

5. The process unit according to claim 1 , wherein the remover contains cerium oxide.

6. The process unit according to claim 1 , wherein the remover is in contact with the image bearer in a direction trailing to the rotation direction of the image bearer.

7. The process unit according to claim 1 , further comprising a support coupling the remover to the spacer.

8. The process unit according to claim 1 , further comprising a cleaning blade holder to hold the cleaner,
wherein the remover is attached to the cleaning blade holder.

9. An image forming apparatus comprising the process unit according to claim 1 .

Assignees

• Kichise Mitsutoshi
• Yamashita Takeshi
• Matsumoto Kazuki
• Kita Emi
• Nakatake Naoki
• Sakashita Takeshi
• Akiyama Takuya
• Ricoh Co Ltd

Inventors

• Kichise Mitsutoshi
• Yamashita Takeshi
• Matsumoto Kazuki
• Kita Emi
• Nakatake Naoki
• Sakashita Takeshi
• Akiyama Takuya

Classifications

• G03G2215/0402

  Exposure devices · CPC title

• G03G21/0029

  Details relating to the blade support · CPC title

• G03G21/1666

  for the exposure unit · CPC title

• G03G2221/1636

  for the exposure unit · CPC title

• G03G21/1821

  means for connecting the different parts of the process cartridge, e.g. attachment, positioning of parts with each other, pressure/distance regulation (G03G21/1825 takes precedence) · CPC title