| 摘要 |
The drum (3) has holding grooves (30) round its interior and its base has first gear engaging a second gear arranged in a hollow tube. Plate (12) mounted vertically on the unit motor shaft (11a) encloses the drum and uses a holding sector for the inside of the coupling balls (13) from outside. A bar-shaped coupling spring (15) holds the balls in, in conjunction with the preferred six or nine grooves (30). The holding plate (13a) extends integrally from the plate (13) centre to reach in between the balls (14), and uses its sector (13b) bent inwards in the top and bottom of the plate to hold the balls in place from outside at the top and bottom. The spring has a diameter of 0.2-0.4 mm. Under motor power, the balls are spun into their grooves (30) etc, using the greater power of the spring, as against the centrifugal force deriving from the unit motor, to hold the balls securely in place.
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