Image forming device

Abstract

The invention discloses an image forming device which has multiple first stage transfer units set parallel and a single power unit which simultaneously applies bias to the multiple first stage transfer units. When executing successive printing or both-sides printing and there is a need to change the bias value of the first stage transfer bias due to a mix of multiple types of recording media, thedevice is able to hold down electricity consumption, sustain image quality, and form images productively. When executing successive printing or both-sides printing, the application timing of the changed transfer bias due to the detection of a different recording medium to that of the initial medium is placed after the previous first stage transfer of a final color toner image is completed.

Description

technical field [0001] The present invention relates generally to image forming apparatuses, and more particularly, to a method for performing control of a first-stage transfer process on an intermediate transfer body to improve copiers, printers, facsimile devices, and multifunction devices using electrophotographic methods. image quality imaging device. Background technique [0002] Conventionally, an image forming apparatus utilizes an electrophotographic method to successively form toner images of one of respective colors with corresponding image supports. On the intermediate transfer body moving in treadmill motion, one color image is superimposed on the other and the first-stage transfer image formed on the intermediate transfer body is transferred to the target transfer body or Recording medium (transfer material, paper). More specifically, the transfer process of the intermediate transfer unit consists of a first-stage transfer process and a second-stage transfer p...

AI Technical Summary

Problems solved by technology

If there is a mixture of multiple types of recording media so that the paper quality changes, in machine types that apply bias to multiple first-stage transfer units at the same time, if the value of the first-stage transfer bias for N sheets of recording media is changed Electrical noise occurs and the image quality result is unsatisfactory for the first-stage transfer bias value for N+1 sheets of recording media (in the case where the toner image straddles the station before or after the change in bias voltage)

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