| 摘要 |
<p>In a magnetic recording and/or reproducing apparatus that includes a cylindrical tape guide drum with at least one rotary magnetic head moved in a circular path substantially coinciding with the periphery of the drum, a tape supply, such as, a cassette containing reels on which a magnetic tape is wound, a holder spaced from the guide drum for receiving and positioning the cassette and a capstan spaced from the guide drum; a support ring is rotatable around the drum between inactive and active positions in an arcuate path that extends adjacent the holder and capstan, tape engaging members including a pinch roller are mounted on the support ring and movable with the latter for extending into the cassette and engaging the tape between the reels with the support ring in its inactive position and for withdrawing a progressively extended loop of the tape from the cassette and wrapping the extended tape loop about at least a portion of the guide drum periphery in response to movement of the support ring to its active position at which the pinch roller is located within the tape loop adjacent the capstan, and an actuating device is operative only during recording and reproducing operations of the apparatus, for example, by energizing of a solenoid, for pressing the pinch roller against the capstan so that the latter drives the tape therebetween and such actuating device is otherwise effective for locking or securely holding the pinch roller away from the capstan with the support ring in its active position so that the tape can remain wrapped about the guide drum, for example, during fast forward and rewinding operations, without the danger that the resulting increased tape tension will move the pinch roller against the capstan.</p> |
