| 摘要 |
PURPOSE:To make a reciprocating motion device smaller in comparison with the stroke of a moving body and especially make the width of the device smaller by a structure wherein a second arm, at the tip of which the moving body is mounted, is mounted at the tip of a first arm driven by a motor in order to remarkably shorten the length of a crank arm as compared with the stroke of the moving body. CONSTITUTION:A second arm 9, the length of which equals to that of a first arm 8, is mounted at the tip of the arm 8 and at the same time a chain 14 is wound between a sprocket 11 fixed to a motor and a sprocket 13 mounted onto the shaft of the second arm 9. At this case, the gear ratio of the sprocket 11 to the sprocket 13 is 2:1. When the first arm 8 is rotated by angle theta1 by a motor, the second arm 9 is rotated by angle theta2=2theta1, resulting in reciprocating the tip of the second arm 9 on a straight line with a stroke four times as long as the length of the first arm 8. |
