| 摘要 |
A bidirectional tape reel brake has a spring loaded movable plate coaxially encircling a motor shaft and arranged to exert a braking force on the motor shaft in proportion to the spring pressure on the brake plate. A brake pad support plate is attached to an end of the motor shaft to position brake pads on the support plate between the movable plate and a fixed brake plate. A first spring is arranged to urge the movable plate toward the brake plate to clamp the brake pads therebetween. A plurality of supplementary or second springs are arranged to exert a supplementary braking force by providing additional spring pressure to the brake plate. The supplementary springs are selectively positionable between a spring position in which the supplementary springs act against the brake plate in a first angular orientation to produce a first spring force and to a second position in which the supplementary springs act against the brake plate in a second angular orientation to produce a second spring force which is less than the first spring force.
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