Manufacturing method of transfer unit

Abstract

A diameter of middle section of at leas one of rollers, which are spanned by an intermediated transfer substance, is increased in respect to the diameter of end sections thereof by an amount which is determined in accordance with a degree of sub-scanning curvature of an image transferred onto a sheet.

Description

[0001]This application, is based on Japanese Patent Application No. 2006-326903 filed on Dec. 4, 2006, in Japanese Patent Office, the entire content of which is hereby incorporated by reference.BACKGROUND OF THE INVENTION[0002]The present invention relates to a manufacturing method of a transfer unit used in an image forming apparatus such as an electro-photographic copying machine, a facsimile machine and a printer.[0003]There are known various color image forming methods for the image forming apparatus. A method called tandem method is one of them. An image forming apparatus employing this tandem method is provided with, a photoconductive substance, light scanning device to write image data on the photoconductive substance, a plurality of image forming sections having a developing device to develop an electrostatic latent image formed on the photoconductive substance and a transfer units to transfer a toner image formed by each image forming section on the photoconductive substanc...

AI Technical Summary

Benefits of technology

The present invention provides a transfer unit that can create high-quality images without color shifting. This is achieved by using a simple structure that prevents the sub-scanning curve. The method involves determining the increasing diameter of a roller in relation to its end sections based on the degree of sub-scanning curvature of the image being transferred.

Problems solved by technology

As above, there was a problem that a high quality image can not be obtained due to color shift if the images of respective colors are transferred onto the sheet P in a state where the sub-scanning curve occurs for each color. FIG. 4(b) shows a state where the ends images are superimposed.

However, since the sub-scanning curve occurs in the image, there was a problem that a high quality image can not be obtained due to the color shift at the time of color imposing.

Therefore, a device to control posture of the imaging element, device to correct the sub-scanning curve and the sensor to detect the sub-scanning curve were necessary, therefore the apparatus became complicated which increases the cost.

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