| 摘要 |
<p>In a tape transport mechanism, a payout reel (10) is supported on a shaft (22) whereabout is wound a helical spring inertia brake (90) fixed at a first end (92) and free at a second end (96), wound such that rotation of the payout reel (10) in response the drawing therefrom of ribbon (12) tends to cause the helical spring inertia brake (90) to be wound more tightly onto the shaft (22). A portion of the ribbon (12) passes onto a tension arm (86). A projection (98) on the tension arm (86) engages the second free end (96) and unwinds the helical spring inertia brake (90) to allow rotation of the shaft (22) opposed by a predetermined amount of torque to maintain tension in the moving ribbon (12). When the moving ribbon (12) ceases to be drawn from the payout reel (10), the tension arm (86) moves back for the projection (98) to allow the helical spring inertia brake (90) once more to grip the shaft (22) and bring the payout reel (10) rapidly to a halt.</p> |
