| 摘要 |
A mechanism for driving a pair of capstans includes a pair of first and second flywheels mounted respectively on the capstans and each having coaxial smaller- and larger-diameter portions, a capstan motor having a pulley including a pair of barrel-shaped portions, an endless belt looped around the pulley and the flywheels, and a pair of belt shifter arms for selectively shifting the endless belt between a first position in which the endless belt is looped around the larger-diameter portion of the first flywheel, the smaller-diameter portion of the second flywheel, and the first barrel-shaped portion, and a second position in which the endless belt is looped around the smaller-diameter portion of the first flywheel, the larger-diameter portion of the second flywheel, and the second barrel-shaped portion. When a magnetic tape is driven by the capstans to travel in a direction from the first to second flywheels, the endless belt is in the first position to tension the magnetic tape between the capstans. When a magnetic tape is driven by the capstans to travel in an opposite direction from the second to first flywheels, the endless belt is in the second position to tension the magnetic tape between the capstans.
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