US 2024/0272576 A1Published application

Image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorsSHINGO ITO, TOSHIHIKO TAKAYAMA, SHUICHI TETSUNO, HIROKO KATAGIRI

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Abstract

An image forming apparatus includes a rotatable image bearing member, a developing member to develop an electrostatic latent image at a developing portion, a transfer member to transfer a developer image to a recording member at a transfer portion; and a brush provided with a plurality of base materials contacting the image bearing member at downstream of the transfer portion and upstream of the developing portion in a rotational direction of the image bearing member. The developer remaining on the surface of the image bearing member is collected in the developing portion. An average distance between base materials of the brush with respect to a rotational axis direction of the image bearing member is larger than an average particle diameter of the developer, and is equal to or less than a length corresponding to a special frequency visually recognizable by a user when the image formed by the image forming apparatus is observed by the user.

Claims14

Dependent claims

An image forming apparatus comprising:

a rotatable image bearing member;
a developer accommodating portion configured to contain a developer;
a developing member configured to develop an electrostatic latent image formed on the image bearing member using the developer at a developing portion;
a transfer member configured to transfer a developer image developed by the developing member from the image bearing member to a transferred member at a transfer portion;
and
a brush contacting the image bearing member at a position of downstream of the transfer portion and upstream of the developing portion with respect to a rotational direction of the image bearing member,
wherein the developer remaining on the surface of the image bearing member is collected in the developer accommodating portion, and
wherein an average distance between bristle materials of the brush with respect to a rotational axis direction of the image bearing member is larger than an average particle diameter of the developer, and is equal to or less than a length corresponding to a spatial frequency of 50 cycles/degree in a state where an image formed on the recording material is viewed from a distance of 300 mm.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/641,579Filed 22 Apr 2024
Priority: JP 2022-00236411 Jan 2022
Published: 15 Aug 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G03G 21/0035
For removing solid developer or debris from the electrographic recording medium: using a brush; Details of cleaning brushes, e.g. fibre density
G03G 21/0064
For removing solid developer or debris from the electrographic recording medium: using the developing unit, e.g. cleanerless or multi-cycle apparatus
G03G 21/1676
Means for handling parts of the apparatus in the apparatus: for the developer unit
G03G 21/168
Means for handling parts of the apparatus in the apparatus: for the transfer unit

Family

Application18/149,350Division · filed 3 Jan 2023
Application18/641,579Division
US 11,994,823 B2Related patent
US 12,259,677 B2Related patent
US 2023/0221673 A1Published application
US 2024/0272576 A1This patent

From the US filing history. Foreign family members aren’t listed.

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