| 摘要 |
First and second adjusting screws are screwed into screw holes of an end plate respectively. An upper belt is interposed between the second adjusting screw and a fixing member. Either one or both of the first adjusting screw and the second adjusting screw are rotated to move the fixed height position of the upper belt under the swinging action about the support point on a lower circular arc-shaped section of the fixing member.
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