FLATNESS MEASURING METHOD FOR SEAMLESS BELT, FLATNESS MEASURING DEVICE, SEAMLESS BELT, SEAMLESS BELT DECIDING METHOD AND IMAGE FORMING APPARATUS EQUIPPED WITH THE SEAMLESS BELT

摘要

PROBLEM TO BE SOLVED: To provide a flatness measuring method for easily and accurately measuring the flatness in the peripheral direction of a seamless belt, a flatness measuring device therefor, a seamless belt deciding method for deciding whether the seamless belt kept under high temperature and high humidity or low temperature and low humidity is excellent in flatness measured by the flatness measuring method, and an image forming apparatus equipped with the seamless belt.;SOLUTION: In the flatness measuring method for the seamless belt 1, the flatness measuring device 9 scans the surface of the seamless belt 1 stretched and laid by predetermined tensile force by using at least two rolls and set in a non-rotating state in the peripheral direction of the seamless belt 1. The seamless belt 1 deciding method is the method using the flatness measuring device and the flatness measuring method. The seamless belt 1 is set so that its flatness measured by the flatness measuring method is 5 mm all over the periphery even when it is kept under high temperature and high humidity or low temperature and low humidity. Then, the image forming apparatus equipped with the seamless belt 1 is provided.;COPYRIGHT: (C)2007,JPO&INPIT