| 摘要 |
PURPOSE:To attain required precision in an easy working method by rotating and driving back and forth directly a weight, which is connected to one end part of a sample cable, with a back and forth linear moving mechanism. CONSTITUTION:A weight 35 is connected to one end part of a sample cable 2. When a wire 20 is moved back and forth linearly, a rotary drum 26 is rotated simultaneously in accordance with this motion and is rotated back and forth at + or -180 deg.. Since the drum 26 is rotated by the wire 20 of less elongation than the sample cable 2, elongation of the sample cable 2 has not influences upon the rotation angle even if the sample cable 2 is extended, and the rotation angle is always kept at + or -180 deg. precision. Consequently, required precision, for example, the precision of the rotation angle per 1mm. extent of movement is improved. |
