Process cartridge and electrophotographic image forming apparatus

Patent metadata

Field	Value
Publication number	US-2024295851-A1
Application number	US-202418661881-A
Country	US
Kind code	A1
Filing date	May 13, 2024
Priority date	Jun 14, 2016
Publication date	Sep 5, 2024
Grant date	—

Abstract

A process cartridge includes a frame having a side surface at a side of the process cartridge. A photosensitive drum is supported by the frame, the photosensitive drum being rotatable about an axis thereof, the photosensitive drum including a first end positioned at the side of the process cartridge and a second end opposite to the first end in a direction of the axis of the photosensitive drum. A projection is positioned coaxial with the photosensitive drum and at the side of the process cartridge, with the projection projecting from the side surface of the frame in the axial direction of the photosensitive drum with at least a tip of the projection being exposed to outside of the process cartridge. A gear is positioned at the side of the process cartridge, with the gear being rotatable about an axis thereof, the gear having a plurality of teeth, with at least some of the teeth being exposed teeth that are uncovered by the frame and exposed to outside of the process cartridge, and with a tip of at least one of the exposed teeth facing the axis of the photosensitive drum.

First claim

1 - 180 . (canceled)

181 . A process cartridge comprising:
a frame including a side surface at a side of the process cartridge; a photosensitive drum supported by the frame, the photosensitive drum being rotatable about an axis thereof, the photosensitive drum including (i) a first end positioned at the side of the process cartridge and (ii) a second end opposite to the first end in a direction of the axis of the photosensitive drum; a projection positioned (i) coaxial with the photosensitive drum and (ii) at the side of the process cartridge, the projection projecting from the side surface of the frame in the axial direction of the photosensitive drum with at least a tip of the projection being exposed to outside of the process cartridge; a developing roller supported by the frame, the developing roller being rotatable about an axis thereof; and a gear positioned at the side of the process cartridge, the gear being rotatable about an axis thereof, the gear having a plurality of teeth, with at least some of the teeth being exposed teeth that are uncovered by the frame and exposed to outside of the process cartridge, and with a tip of at least one of the exposed teeth facing the axis of the photosensitive drum, wherein, as measured in the axial direction of the photosensitive drum, (i) the tip of the projection is positioned farther from the second end of the photosensitive drum than the first end of the photosensitive drum is positioned from the second end of the photosensitive drum, and (ii) at least a part of the exposed teeth of the gear is positioned farther from the second end of the photosensitive drum than a tip of the projection is positioned from the second end of the photosensitive drum, and wherein, as measured along a line perpendicular to the axis of the photosensitive drum, a shortest distance from the axis of the photosensitive drum to a tip of one of the plurality of teeth is 90% to 110% of a length of a radius of the photosensitive drum.

182 . A process cartridge according to claim 181 , wherein the gear is a spur gear.

183 . A process cartridge according to claim 182 , wherein the teeth of the spur gear are 1 mm or less in length along an axial direction of the spur gear.

184 . A process cartridge according to claim 181 , wherein the teeth of the gear are 1 mm or less in length along an axial direction of the gear.

185 . A process cartridge according to claim 181 , further comprising a stopper positioned at the side of the process cartridge, the stopper having a surface extending in the axial direction of the photosensitive drum and facing the axis of the photosensitive drum.

186 . A process cartridge according to claim 181 , wherein the frame includes a slit at the side of the process cartridge, with the slit being open to outside of the frame (i) in a first direction that is perpendicular to the axis of the photosensitive drum and (ii) in a second direction that is perpendicular to the first direction, and
wherein, when the process cartridge is oriented such that the axis of the photosensitive drum is positioned above the axis of the gear, the slit is open towards a top side of the process cartridge.

187 . A process cartridge according to claim 186 , wherein at least one of the exposed teeth faces the slit.

188 . A process cartridge according to claim 186 , wherein, as measured in the axial direction of the photosensitive drum, at least a part of the slit is positioned farther from the second end of the photosensitive drum than the tip of the projection is positioned from the second end of the photosensitive drum.

189 . A process cartridge according to claim 186 , wherein the slit runs perpendicular to the axial direction of the photosensitive drum.

190 . A process cartridge according to claim 181 , wherein the gear is a helical gear.

191 . A process cartridge according to claim 190 , wherein the gear is operatively connected to the developing roller.

192 . A process cartridge according to claim 181 , wherein the gear is operatively connected to the developing roller.

193 . A process cartridge according to claim 190 , wherein the gear is positioned coaxial with the developing roller.

194 . A process cartridge according to claim 181 , wherein the gear is positioned coaxial with the developing roller.

195 . A process cartridge according to claim 181 , wherein the frame includes:
a first frame supporting the photosensitive drum; and a second frame supporting the developing roller.

196 . A process cartridge according to claim 181 , wherein the photosensitive drum and the developing roller are operatively connected to each other.

Assignees

• Canon Kk

Inventors

• Murakami Ryuta
• Horikawa Tadashi
• Uratani Shunsuke
• Inaba Yuichiro

Classifications

• G03G21/1839

  Means for handling the process cartridge in the apparatus body · CPC title

• G03G2221/183

  Process cartridge · CPC title

• G03G2221/1657

  transmitting mechanical drive power · CPC title

• G03G21/1864

  associated with a positioning function · CPC title

• G03G21/1647

  Mechanical connection means · CPC title