| 摘要 |
<p>The drive moves the horizontal arm longitudinally using a belt (11) looping over a drive wheel (14). The ends of the belt are fixed to opposite ends of the arm (1). Two rollers (12,13) change the direction of the belt so it lies parallel to the arm. The rollers are located one on each side of the drive wheel. The belt is in contact with the drive wheel for more than 180 degrees. The drive wheel is driven by a motor via a second belt system. The second belt system comprises an endless belt (18) looping over a large wheel (17) fixed to the drive wheel's axis and over a small wheel (19) rotated by the motor (3).</p> |
