| 摘要 |
<p>The method involves activating drive units of a numeral collar (7) and a ball by a control unit such that the collar and the ball are rotated in opposite directions and an objective numeral for the ball is determined by a roulette control unit. Rotation direction and the velocity of the ball are synchronized with that of the collar when reaching a preset peripheral speed of the ball and reaching the objective numeral at the collar of the roulette control unit. A circulating twin arm with a permanent magnet is assigned to a ball guide trajectory (8) of a backlash device (5).</p> |
