| 摘要 |
PURPOSE:To wind up a cord to perfection, by installing a slider in position between a cord take-up reel being energized in a winding direction by a spiral spring and a sprial sliding guide making a rotary shaft of the reel a center shaft, while moving this slider reversibly along the said sprial sliding guide. CONSTITUTION:When a cord 5 is wound up, a reel part 6 rotates in an (a) direction by dint of a spiral spring, while a slider 22 moves toward a central part from an outer circumferential part of the reel part 6 as reversely in time of drawing an earphone 4 out. That is to say, this slider moves in a (d) direction on the reel part 6. At this time, pressing force in a spring of the slider 22 is almost constant to the reel part 6, but torque to the reel part 6 is clearly larger in the inner circumferential part. Therefore, in time of starting to wind the cord 5, it is recommeded that braking force be large and the cord be wound up slowly and that the nearer to the winding end the weaker in the braking force, and under this condition, even if energizing force of the spiral spring is weakened, the cord 5 is completely wound up. |
