| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To solve the problem that a size (a depth direction) in a moving direction of a driving means accompanied with fixed linear movement exceeds two times of the length of a linear movement stroke. <P>SOLUTION: A drive unit is formed by combining a worm wheel and a helical rack gear. Thereby, a drive transmission point from the worm wheel to a helical rack is displaced with movement, and the size in the moving direction is reduced by that much. <P>COPYRIGHT: (C)2003,JPO</p> |
