| 摘要 |
<p>Specification Title of the Invention Magnetic recording and reproducing apparatus A tape recorder of the auto-reverse system wherein all the tape drives including the constant-speed drive of a tape, the rapid drive thereof, the change-over between the normal and reverse drives, etc. are executed by means of a single capstan employing a single motor as its drive source, and wherein all the reel rest drives including the constant-speed drives of reel rests, the rapid drive thereof, the change-over between the normal and reverse drives, etc. to be made following the tape drives by the capstan are executed by means of a single idler employing the single motor as its drive source. All the tape controls are achieved by the use of the single capstan, the single idler and the single motor. More specifically, the change of the directions of rotation of the single idler and capstan, i.e., the inversion of the tape drive is effected by the normal reverse change-over of the single motor, the operation of alternately bringing the single idler into engagement with or disengagement from the reel rests is attained by the turning force of the normal - reverse change-over of the motor, and the changeover of the speeds of rotation of the single capstan as well as the single idler is accomplished by two-stage change-over speeds of the single motor. Thus, with the single motor, the one idler and the one capstan which employ it as the drive source are controlled to the constant-speed rotation or the rapid rotation, and besides, the change-over of the directions of rotation is possible. Further, this invention provides an electric circuit system for perfectly putting such mechanism into practical use. The electric circuit system includes a circuit which holds the motor at the predetermined constant-speed rotation and thereby effects the constant-speed feed of the tape, a circuit which reliably controls the normal and reverse rotations of the motor in response to a tape inversion command signal, a circuit which changes-over the motor from the constant-speed rotation to the high-speed rotation and thereby controls the rewinding and the fast feed of the tape. Owing to the development of the electric circuit system based on such peculiar control method and to the combination between this electric circuit system and the mechanism stated above, the auto-reverse type magnetic recording and reproducing apparatus of the one-capstan and one-idler system is realized. -1a-</p> |
