| 摘要 |
<p>PURPOSE:To eliminate any resulting during rotation by installing a steel ball, being pressed by a spring, on a braking plane between a brake plate and a moving magnet core shiftably set up in the axial direction, rolling this ball, and improving its smoothability so better. CONSTITUTION:When voltage is impressed on a magnet coil 2, a moving magnet core 4 is attracted against pressing force of a braking spring 3 by dint of magnetic attraction. Accordingly, a rotary disk 6 so far pressed to a brake plate 7 comes free of rotation, and is rotated by turning effort of a turning shaft 9. When this impressed voltage is erased, the magnetic attraction goes out, and the core 4 is pressed to the brake plate 7 together with the rotary disk 6 by dint of pressing force of the braking spring 3, so that the rotary disk 6 and the turning shaft 9 both are braked. In suchlike constitution, when the turning shaft 9 is operated in the vertical direction, the rotary disk 6 tries to drop at both sides of the core 4 and brake plate 7 with its own weight. At this time, since a spring 10 makes the rotary disk 6 so as to be floated via a steel ball 11, its smoothability is improved by this steel ball 11, thus there are no rustling and abrasion is decreased.</p> |
