| 摘要 |
PROBLEM TO BE SOLVED: To provide a structurally simple drill, adjustable to a sufficiently small interval by easily adjusting a lateral interval of the drill. SOLUTION: In this drill, a plurality of drills are laterally juxtaposed, and a toothed pulley 2 is attached to an upper part of the respective drills, and the toothed pulley 2 is rotatingly driven by a timing belt 3. The drill is constituted so that the whole toothed pulleys 2 are arranged in a straight line shape in a plan view in the same horizontal plane, and the timing belt 3 also endlessly travels by a driving motor, and has a straight traveling part S in a plan view, and is rotatingly driven by meshing the whole toothed pulleys 2 in the straight traveling part S. COPYRIGHT: (C)2007,JPO&INPIT
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