| 摘要 |
PROBLEM TO BE SOLVED: To hardly be affected by the friction between a lower belt 110 and an upper belt 120 when correcting the lopsided run of the belts. SOLUTION: A first value obtained by multiplying a coefficient of friction between a tension imparting roll 112B and the lower belt 110 by the pushing force of the tension imparting roll 112B on the lower belt 110 and a second value obtained by multiplying a coefficient of friction between a tension imparting roll 122B and the upper belt 120 by the pushing force of the tension imparting roll 122B on the upper belt 120 are each greater than a third value obtained by multiplying a coefficient of friction between the lower belt 110 and the upper belt 120 by the pushing force of four pushing rolls 114 and supporting rolls 112C, 112D thereon. Thus, the moving force of the lower belt 110 in a belt cross direction and the moving force of the upper belt 120 in a belt cross direction are each greater than force of friction between the lower belt 110 and the upper belt 120. As a result, the influences of friction are hardly given between the lower belt 110 and the upper belt 120 when independently correcting the lopsided run of the belts. COPYRIGHT: (C)2011,JPO&INPIT |
