| 摘要 |
PURPOSE:To prevent the strength of a support part from decreasing and to facilitate assembling operation by uniting an arm and a carriage, providing a thickness-directional step part to the tip part of the arm and the arm confronting part of a head assembly, and fitting the step parts in each other and coupling and fixing the head assembly to the arm with a screw. CONSTITUTION:The arm 2 has the step in the thickness direction atop and a U groove 23 at its thin part, and the insertion of a fixing screw 21 is therefore facilitated. The head assembly 1 has the step part in the thickness direction at its root and a tap hole 22 at its thin part and the screw 21 is engaged threadably. The step part of the head assembly 1 and the tip of the arm 2 are fitted in each other and fixed with the screw 21. When there are plural arms 2, the arms are assembled from the lowermost arm and a driver is stored in the U groove 23, so that screw clamping is facilitated.
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