| 摘要 |
<P>PROBLEM TO BE SOLVED: To suppress wear of a helical gear of a worm wheel 76. <P>SOLUTION: A driving side rotation axis member 77 and a driven side rotation axis member 84 are connected on the same rotation axis by engagement of a first coupling 78a and a second coupling 78b. A driven side unit 90 including non-illustrated pressure roller, the driven side rotation axis member 84 and the like is held on a frame to be slidable and movable in an axis direction. A drive motor 71 is driven by a prescribed amount to change the attitude of a rotation angle of the worm wheel 76 on the basis of the detection of release of the engagement of the first coupling 78a and the second coupling 78b according to the movement of the frame by non-illustrated detection means. <P>COPYRIGHT: (C)2013,JPO&INPIT |
