Among the magnetic video recording and reproducing apparatus (which will be designated VTR hereinafter) employing a helical scanning system, those which as shown in FIGS. 1 and 2 have been widely known. In these, the magnetic tape is intermittently driven for reproduction and is displaced a fixed distance for every action. In the apparatus shown in FIG. 1, a control signal recorded on the magnetic tape 1 is detected by the magnetic head 7 and, depending on this signal, the pinch roller 6 is moved away from the capstan 8 by driving the plunger 5 which is provided for this purpose, whereby intermittent transporting of the magnetic tape is obtained. The reference numeral 4 designates a circuit for driving the plunger.
The capstan 8 is driven by the motor 2 and the motor driving circuit 3 so as to rotate at the same speed as that during ordinary continuous running when intermittent feeding is not performed. As a result, the magnetic tape is intermittently driven every time the pinch roller 6 is pressed toward the capstan 8 to pinch the tape thereagainst.
In the apparatus shown in FIG. 2, the capstan 8 is connected to the motor 2 through a clutch 10. This clutch 10 is driven according to the control signal from the control circuit 9 and causes the capstan 8 to rotate intermittently and the magnetic tape to run intermittently.
Both devices of conventional type a shown in FIGS. 1 and 2 have such drawbacks that they have a complicated structure and make offensive noise due to necessity to provide such components as a plunger 6 and/or a clutch 10 which are not primarily driving elements for the tape. In addition, in these devices the tape speed increases so abruptly, as shown in FIG. 3, that the tape tension is made abnormally high, giving rise to a risk of damage to the tape itself or the revolving magnetic head.