| 摘要 |
A tape back-tension mechanism for a magnetic recording/reproducing apparatus provides an instantaneous and secure braking force during mode shifting. In the mechanism, a take-up reel table includes a reel gear and a reel disk coupled to the reel gear and frictionally rotated by the reel gear. A predetermined force is applied to the take-up reel disk to prevent a magnetic tape from becoming loose due to the inertia created when a reel gear of a supply reel table stops during the shifting of the operational mode. Each of the reel disks accommodate a reel of a tape cassette. Further, the mechanism includes a fixed gear constantly engaged with a take-up reel gear, a floating gear constantly engaged with the fixed gear, the floating gear alternatively engaging and disengaging the take-up reel gear, and a connection lever for connecting the fixed gear and the floating gear.
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