US 2009/0269104 A1Published application

Image forming apparatus

AssigneeCanon Kabushiki Kaisha

InventorJun Mochizuki

Life of this patent

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Abstract

An image forming apparatus includes first and second rotatable image bearing members, a rotatable belt member which can abut on the first and second image bearing members, a drive mechanism to attach or separate the second image bearing member to or from the belt member, a rotation drive mechanism, and a controller controlling a rotational speed of the second image beating member so that the second image bearing member rotates with a predetermined circumferential speed difference with respect to the belt member at least when image formation is performed by the second image bearing member. When the second image bearing member abuts on or separates from the belt member, the controller controls the rotational speed of the second image bearing member so that a circumferential speed difference between rotational speeds of the second image bearing member and the belt member is smaller than the predetermined circumferential speed difference.

Claims6

Dependent claims

An image forming apparatus comprising:

a first rotatable image bearing member configured to bear a toner image;
a second rotatable image bearing member configured to bear a toner image;
a rotatable belt member which can abut on the first and second image bearing members;
a drive mechanism configured to attach or separate the second image bearing member to or from the belt member;
a rotation drive mechanism configured to rotate and drive the second image bearing member;
and
a controller capable of controlling a rotational speed of the second image bearing member so that the second image bearing member rotates with a predetermined circumferential speed difference with respect to the belt member at least when image formation is performed by using the second image bearing member,
wherein when the second image bearing member abuts on or separates from the belt member, the controller can control the rotational speed of the second image bearing member so that a circumferential speed difference between the rotational speed of the second image bearing member and a rotational speed of the belt member is smaller than the predetermined circumferential speed difference.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 12/429,975Filed 24 Apr 2009
Priority: JP 2008-11390324 Apr 2008
Published: 29 Oct 2009
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

G03G 15/0131
Details of unit: for transferring a pattern to a second base
G03G 2215/0129
The linear arrangement being horizontal or slanted: horizontal medium transport path at the secondary transfer
G03G 2215/0154
Characterised by the technical problem: vibrations and positional disturbances when one member abuts or contacts another member
G03G 2215/0193
Structural features of the multicolour image forming apparatus: transfer member separable from recording member

Family

US 8,160,480 B2Related patent
US 2009/0269104 A1This patent

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

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Citations

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