JP2007102009A5

JP2007102009A5 -

Info

Publication number: JP2007102009A5
Application number: JP2005293735A
Authority: JP
Filing date: 2005-10-06
Publication date: 2008-11-20
Anticipated expiration: 2025-10-06

Claims

A plurality of image carriers;
A plurality of developing members for developing a latent image formed on each of the plurality of image carriers with a developer; and a plurality of the developing members and the plurality of image carriers are selectively brought into contact with and separated from each other. Contact and separation means;
Conveying means for conveying the transfer material in order to transfer the image developed on the image carrier to the transfer material;
A second abutting / separating means for selectively abutting and separating the plurality of image carriers with respect to the conveying means;
A plurality of driving means for driving the plurality of image carriers and the plurality of developing members;
Control means for switching between a first image forming mode for forming an image using all of the plurality of image carriers and a second image forming mode for forming an image using one of the plurality of image carriers. Have
The control means controls the developing member that is not used for image formation among the plurality of developing members to be separated from the image carrier by the first contact / separation means in the second image forming mode; and An image forming apparatus, wherein the second contact / separation unit controls all the image carriers to contact the transport unit.

In the second image forming mode, the control unit is configured to perform the first contact when the transfer material is a predetermined type of transfer material and the installation environment of the apparatus is a high temperature and high humidity environment. Control so that all the developing members are in contact with the image carrier by the separation means, and control so that all the image carriers are in contact with the transport means by the second contact / separation means. The image forming apparatus according to claim 1.

In the first image forming mode, the control unit controls the first contact / separation unit to contact all the developing members to the image carrier, and the second contact / separation unit 3. The image forming apparatus according to claim 1, wherein all the image bearing members are controlled to contact the conveying unit. 4.

The plurality of image carriers are image carriers for forming images of a plurality of colors, respectively, and the first image forming mode is a mode for forming images of a plurality of colors, and the second image forming mode. The image forming apparatus according to claim 1, wherein the image forming apparatus is a mode for forming a monochrome image.

The image forming apparatus according to claim 1, wherein an image forming speed in the second image forming mode is higher than an image forming speed in the first image forming mode.

The image forming apparatus according to claim 1, wherein the driving unit includes a DC motor or a DC brushless motor.

A plurality of image carriers, a plurality of developing members that develop the latent images formed on each of the plurality of image carriers with a developer, and a plurality of the developing members and the plurality of image carriers are selectively used. A first abutting / separating means for abutting and separating, a conveying means for conveying the transfer material to transfer an image developed on the image carrier to a transfer material, and a plurality of the conveying means An image forming apparatus comprising: a second contact / separation unit that selectively contacts and separates the image carrier; and a plurality of drive units that drive the plurality of image carriers and the plurality of developing members. Control method,
A mode switching step for switching between a first image forming mode in which an image is formed using all of the plurality of image carriers and a second image forming mode in which an image is formed using one of the plurality of image carriers. When,
When switching to the second image forming mode, the first contact / separation means controls the developing member that is not used for image formation among the plurality of developing members to be separated from the image carrier, and A control step of controlling all the image carriers to contact the conveying means by the second contact / separation means;
A control method for an image forming apparatus, comprising:

Further, when the transfer material is a predetermined type of transfer material and the installation environment of the apparatus is a high temperature and high humidity environment when the mode is switched to the second image forming mode, the first contact / separation is performed. Control for controlling all the developing members to contact the image carrier by means, and control for bringing all the image carriers to contact the conveying means by the second contact / separation means 8. The method of controlling an image forming apparatus according to claim 7, further comprising steps.

Further, when the mode is switched to the first image forming mode, the first contact / separation means controls all the developing members to contact the image carrier and the second contact / separation means. 9. The method of controlling an image forming apparatus according to claim 7, wherein control is performed so that all the image carriers are brought into contact with the transport unit.

The first image forming mode is an image forming mode for forming an image of a plurality of colors, and the second image forming mode is an image forming mode for forming an image of a single color. 10. A method for controlling an image forming apparatus according to any one of items 9 to 9.

11. The image forming apparatus according to claim 7, wherein an image forming speed in the second image forming mode is faster than an image forming speed in the first image forming mode. Method.