| 摘要 |
<P>PROBLEM TO BE SOLVED: To highly accurately control the moving velocity of an endless moving member without being affected by the moving velocity of the endless moving member, the attachment error of a sensor, the mark pitch error and the contraction/expansion, etc. <P>SOLUTION: Many marks continuously formed at equal intervals on the surface of the intermediate transfer belt 10 as the endless moving member are detected by mark sensors 6A and 6B, and the phase difference of the detection signal is calculated by a phase difference calculating means 13. The profile of the mark pitch error by the amount of one rotation is formed by a profile forming means 14 based on the phase difference Cab successively calculated when the intermediate transfer belt 10 is previously rotated once, and then, the mark pitch correction data by the amount of one rotation is formed and stored by a correction data storing means 37 based on the profile. At the following normal operation, the feedback control of the moving velocity of the intermediate transfer belt 10 driven by the driving means 80 is performed by a control means 70 while correcting target position data based on the successively calculated phase difference Cab and the mark pitch correction data successively read from the correction data storing means 37. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
