Developing device, process cartridge, and image forming apparatus

Patent metadata

Field	Value
Publication number	US-10705484-B2
Application number	US-201916575384-A
Country	US
Kind code	B2
Filing date	Sep 19, 2019
Priority date	Sep 28, 2018
Publication date	Jul 7, 2020
Grant date	Jul 7, 2020

Abstract

A developing device includes a developing roller, a cover to cover the developing roller from above the developing roller, a filter to cover a vent of the cover to filter air and collect toner passing through the vent, and a pressing member engaged with the cover in which the filter is installed. The cover includes a projecting support to support the filter. The pressing member holds the filter between the pressing member and the cover. The projecting support is projected from one end toward the other end of the vent in a transverse direction of the vent at a part of the cover in a longitudinal direction of the developing roller to block the vent, and cantilevered on the one end. A gap is provided between a tip of the projecting support and an inner edge of the cover on the other end.

First claim

What is claimed is:

1. A developing device configured to develop a latent image formed on an image bearer, the developing device comprising:
a developing roller opposed to or in contact with the image bearer;
a cover configured to cover the developing roller from above the developing roller, the cover including a projecting support and having a vent to allow ventilation of the developing device;
a filter configured to cover the vent of the cover to filter air and collect toner passing through the vent; and
a pressing member configured to engage the cover in which the filter is installed and hold the filter between the pressing member and the cover,
the projecting support:
projecting from one end of the vent in a transverse direction of the vent toward other end of the vent in the transverse direction of the vent at a part of the cover in a longitudinal direction of the developing roller, to block the vent;
cantilevered by the cover on the one end of the vent in the transverse direction of the vent; and
configured to support the filter,

a gap is provided between a tip of the projecting support and an inner edge of the cover on the other end of the vent in the transverse direction of the vent.

2. The developing device according to claim 1 ,
wherein a plurality of projecting supports including the projecting support is spaced each other in the longitudinal direction of the developing roller.

3. The developing device according to claim 1 ,
wherein the cover includes a circumferential support configured to support the filter around a circumference of the filter,
wherein the projecting support projects from one end of the circumferential support in the transverse direction of the vent toward other end of the circumferential support in the transverse direction of the vent.

4. The developing device according to claim 1 ,
wherein the developing roller is disposed on the other end of the vent in the transverse direction with respect to the vent.

5. The developing device according to claim 1 ,
wherein the cover has an opening disposed on the one end of the vent in the transverse direction with respect to the vent.

6. The developing device according to claim 5 , further comprising:
a sheet member configured to isolate an inside of the developing device to form a closed space inside the developing device, the closed space configured to contain a developer; and
a winding shaft configured to rotate in a predetermined direction and wind the sheet member in a direction perpendicular to an axis of rotation of the winding shaft to remove the sheet member from the inside to an outside of the developing device through the opening when the developing device starts to be used in an image forming apparatus, and
wherein the pressing member covers the winding shaft between the cover and the pressing member.

7. The developing device according to claim 1 ,
wherein the pressing member has a plurality of ventilation openings in the cover,
wherein the plurality of ventilation openings is separated from each other at a position corresponding to the projecting support in the longitudinal direction of the developing roller.

8. The developing device according to claim 1 , further comprising a developer regulator opposed to the developing roller below the developing roller and configured to adjust an amount of developer carried on the developing roller.

9. A process cartridge configured to be removably installable in an image forming apparatus, the process cartridge comprising:
the developing device according to claim 1 ; and
the image bearer combined with the developing device as a single unit.

10. An image forming apparatus comprising:
the developing device according to claim 1 ; and
the image bearer.

Assignees

• Oshikawa Yuki
• Fujiwara Yoshihiro
• Kawashima Naohiro
• Mase Ryusuke
• TSUCHIYA Yuuki
• Ricoh Co Ltd

Inventors

• Oshikawa Yuki
• Fujiwara Yoshihiro
• Kawashima Naohiro
• Mase Ryusuke
• TSUCHIYA Yuuki

Classifications

• G03G21/1676

  for the developer unit · CPC title

• G03G21/206 Primary

  Conducting air through the machine, e.g. for cooling, filtering, removing gases like ozone · CPC title

• G03G15/0893

  in a closed loop within the sump of the developing device · 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

• G03G15/0822

  Arrangements for preparing, mixing, supplying or dispensing developer · CPC title