| 摘要 |
<p>PROBLEM TO BE SOLVED: To eliminate a jamming by a mechanism capable of detecting a rotation stop caused by the overload of torque on a taking-up side reel shaft surely in ether case of forward and backward tape feeding directions. SOLUTION: A rotation transmission gear 29 is meshed with the gear 31 of a winding reel shaft 30, and an eccentric cam ring 50 is fixed to a rotation transmission shaft 25. When the winding reel shaft 30 is rotated, a lever 53 is swung b a cam ring 51, and the passage of a shut-off plate 57 through a slit 57f causes a photointerrupter 42 to output a pulse. Since the pulse outputting is stopped when the winding reel shaft 30 is stopped by an overload of torque, a motor is stopped or switched to a reverse mode. When the rotation transmission gear 29 is switched to the gear 34 the reverse winding reel shaft 32 side, a rotation stop is similarly detected by a slit 57r.</p> |
