| 摘要 |
Through a coupling member 30 , a drive-feed shaft 41 a is fitted and, at the other end of the drive-feed shaft 41 a, a drive-transmission gear 40 a is fixed. By a compression spring 44 , the coupling member 30 is loaded with a force that tends to move it in the direction indicated by arrow D, and is in a first position where the coupling member 30 coupling member 30 couples the drive-feed shaft 41 a with a rotated member. When an arm member 33 is pulled up in the direction indicated by arrow E, a first rib 30 a rides on a second rib 34 along a slanted surface 34 a, and the coupling member 30 moves in the direction indicated by arrow D' against the force exerted by the compression spring 44 , and is retracted into a second position where the coupling member 30 decouples the rotated member from the drive-feed shaft 41 a.
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