Belt device

Abstract

Pulleys 29a, 29b are provided on both ends of the driven roller 28 as separate components from the driven roller 28, and on both edges in the width direction of the transfer belt 24, ribs 24a, 24b that can be engaged with the outer sides in the axial direction of the pulleys 29a, 29b are provided. If the transfer belt 24 becomes inclined to the left side during movement, the rib 24a on the right edge of the transfer belt 24 will be restricted by the outer side in the axial direction of the pulley 29a provided on the right side end of the driven roller 28, thereby correcting meandering to the left at the position of the driven roller 28.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a belt device, and more particularly to a meandering prevention device of an image forming device transfer belt.BACKGROUND INFORMATION[0002]For image forming devices, particularly color photocopiers, color printers and other color image forming devices, multistep drum types (tandem type) capable of higher speed processing than a single drum type device are becoming the mainstream. In a tandem color image forming device, image forming units, for example, magenta, yellow, cyan and black, are arranged by color in the paper transport direction, and a color toner image is sequentially formed by the image forming units of each color.[0003]The image forming units of each color are arranged so as to face a transfer belt serving as an image support body, and the toner image sequentially formed by the image forming units of each color is transferred to the transfer belt by first transfer means. The transfer belt is endlessly wound o...

AI Technical Summary

Benefits of technology

The present invention relates to a belt device that prevents belt meandering. The device includes a driving roller, driven roller, pulleys, and a belt. Ribs are formed on the edges of both sides of the belt to engage with the outer sides of the pulleys in the axial direction. The pulleys are provided on both ends of the driven roller so as to freely rotate coaxially and relatively with respect to the driven roller. This prevents belt meandering and wear of the engaging surfaces of the ribs can be reduced. The driven roller is formed in a crown shape to naturally return the belt to the center when meandering occurs. The device with pulleys on both ends of the driven roller is simpler and more effective in preventing belt meandering than other configurations.

Problems solved by technology

However, if because of a difference in perimeter length of the two ends of the belt, there is a large difference in peripheral velocity in the belt width direction, there will be significant belt meandering and the ribs may ride up on the rollers.

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