US 2016/0252841 A1Published application

Image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorsGosuke Goto, Satoshi Sunahara, Akihisa Matsukawa

Life of this patent

Estimating the term…

Loading patent…

Abstract

An image forming apparatus includes: an image bearing member; a developer carrying member; an electroconductive regulating member; and a bias applying portion for applying, to the regulating member, a bias of the same polarity as a polarity of the developer on a surface of the developer carrying member at least during a developing operation. The developer remaining on the surface of the image bearing member after transfer of a developer image is transferred is collected by the developer carrying member. At timing when the developer carrying member is driven in a period other than during the developing operation, a potential difference between the regulating member and the developer carrying member is made zero or a voltage which is different from a voltage applied to the developer carrying member toward a side of a polarity opposite the polarity of the developer is applied to the regulating member.

Claims6

Dependent claims

An image forming apparatus comprising:

an image bearing member on which a latent image is formed;
a developer carrying member for developing the latent image while carrying a developer;
an electroconductive regulating member for regulating a layer thickness of the developer in contact with said developer carrying member;
and
bias applying means for applying, to said regulating member, a bias of the same polarity as a polarity of the developer on a surface of said developer carrying member at least during a developing operation,
wherein the developer remaining on the surface of said image bearing member after a developer image formed on said image bearing member is transferred is collected by said developer carrying member, and
wherein at timing when said developer carrying member is driven in a period other than during the developing operation, a potential difference between said regulating member and said developer carrying member is made zero or a voltage which is different from a voltage applied to said developer carrying member toward a side of a polarity opposite the polarity of the developer is applied to said regulating member.

4 more elements

An image forming apparatus comprising:

an image bearing member on which a latent image is formed;
a developer carrying member for developing the latent image while carrying a developer;
an electroconductive regulating member for regulating a layer thickness of the developer in contact with said developer carrying member;
and
bias applying means for applying a bias to said developer carrying member at least during a developing operation;
and
Zener diode for providing a potential difference between said regulating member and said developer carrying member,
wherein the developer remaining on the surface of said image bearing member after a developer image formed on said image bearing member is transferred is collected by said developer carrying member, and
wherein at timing when said developer carrying member is driven in a period other than during the developing operation, said potential difference between said regulating member and said developer carrying member is made zero by said Zener diode.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/050,661Filed 23 Feb 2016
Priority: JP 2015-03838127 Feb 2015
Published: 1 Sep 2016
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G03G 15/065
For developing: arrangements for controlling the potential of the developing electrode
G03G 15/0812
On a donor element, e.g. belt, roller: characterised by the developer regulating means, e.g. structure of doctor blade
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
Electrography

Family

US 9,835,973 B2Related patent
US 2016/0252841 A1This patent

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

Timeline

Citations

Open elsewhere

Building an agent or pulling many patents? Use the API or MCP server instead of scraping pages. Get an API key