| 摘要 |
PURPOSE:To enable the rolling distance of gears to be made small even where fixed fastening points are spaced from each other and facilitate fine adjustment of a gap, by sequentially engaging a plurality of fastening points of an operating lever with the fixed fastening points provided on a frame. CONSTITUTION:Gears 11 are fixed to both ends of a carrier shaft 3 on which a carrier 2 is slidably supported. Racks engaged with the gears 10 are provided on a frame 5 in a fixed state. An operating lever 15 fixed to an end part of the shaft 3 is provided with fastening points 16-18 deviated from the center of the gear, and a multiplicity of fastening points 19-21 to be elastically engaged with the fastening points 16-18 are groups for each of the fastening points 16-18 are provided on the frame. The positions of the fixed fastening points 19-21 are deviated for each of the groups corresponding respectively to the fastening points 16-18 of the operating lever 15 so that the fastening points 16-18 are sequentially engaged with the fixed fastening points 19-21. By turning the operating lever 15, the gears are caused to roll on the racks, whereby the fastening points 16-18 are sequentially engaged with the fixed fastening points 19-21 on the frame. Accordingly, the rolling distance of the gears can be made small even where the fixed fastening points are spaced from each other for each of the group corresponding respectively to the fastening points of the operating lever. |
