JPH0614305Y2 - Reel drive - Google Patents

Description

[Detailed Description of Device] a. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel driving device such as a video tape recorder.

B. 2. Description of the Related Art In a reel driving device of a conventional video tape recorder, only the driving force of a capstan motor is used, direct driving is performed in fast forward (FF) and rewind (REW) modes, and other reproducing modes, that is, Forward and backward playback, forward and backward slow playback, fast forward playback (CUE), rewind playback (R
In each mode of EV), the mainstream is driving through a slip mechanism in order to obtain a required winding torque (for example, JP-A-63-847 G11B15 / 4).
4). In this case, when reversing the tape running direction,
Since it takes time to reverse the winding direction of the reel drive mechanism, there is a disadvantage in that the timing of winding the tape by the reel is delayed as compared with the tape conveyance by the pinch roller.

On the other hand, since the method of driving the reel using only the reel motor is independent of the tape transport, there is no problem that the timing of winding the tape is delayed when the tape running direction is reversed. A wide range of characteristics is required from the low speed in the slow reproduction mode to the high speed in the FF and REW modes, and a motor satisfying these characteristics is expensive.

C. Therefore, in the present invention, the reel drive is performed by the capstan motor in the FF and REW modes, and the reel motor is driven in the other reproduction modes.

D. Means for Solving the Problems A first transmission mechanism for transmitting a rotational drive force of a capstan motor to a reel drive shaft in FF and REW modes, and a reproduction mode other than the above modes, that is, forward and reverse reproduction, forward and reverse. A second transmission mechanism for transmitting the rotational driving force of the reel motor to the reel drive shaft in each of the direction slow reproduction, fast forward reproduction (CUE), and rewind reproduction (REV) modes is provided, and the first and The second transmission mechanism is selectively operated.

E. Action According to the above configuration, a winding speed sufficiently higher than that of the capstan motor can be obtained in the FF and REW modes, and a rotational driving force can be obtained from the reel motor in the other reproduction modes. Therefore, it is possible to easily match the tape transport timing with the tape winding timing.

F. Example The rotational driving force of the capstan motor (1) is via the belt (2), and the rotational driving force of the reel motor (3) is via the gear (4) and the slip mechanism (5) fixed to the motor support shaft. Transmission mechanism through
It is transmitted to (6). The transmission mechanism (6) selectively transmits rotational force to the reel gear (9) or (10) on the supply side or the winding side via the intermediate gear (7) or (8) rotatably supported by the chassis. To do. Reel drive shafts (9a) and (10a) are formed on the reel gears (9) and (10).

The slip mechanism (5) includes a support shaft (12) fixed to a substrate (11), gears (13) and (14), a felt (15), and a spring (16). FIG. 2 shows a playback mode such as forward and reverse playback. The rotation of the gear (4) fixed to the motor support shaft of the reel motor (3) is transmitted to the gear (13) and further felt. It is transmitted to the gear (14) via (15).

The transmission mechanism (6) includes a support frame (17) fixed to the substrate (11), a support shaft (18) fixed to the support frame (17), gears (19) (20), a pulley (21), It is composed of a mounting plate (22) pivotally supported by the support shaft (18) and a gear (23) supported by the mounting plate (22). gear
(19) has a connecting piece (19a) and selectively engages with the gear (14) or the pulley (21). In the state shown in FIG. 2, the gear (19) is urged upward by the spring (24) and is engaged with the gear (14), and the rotation of the gear (14) is prevented by the gear (2).
0).

Now, the rotation of the reel motor (3) is transmitted through the gear (4), the gear (13), the gear (14) and the gear (19), and the gear (20) is rotated counterclockwise in FIG. When rotated, the gear (23) supported by the mounting plate (22) rotates clockwise. Since the gear (23) and the mounting plate (22) are frictionally mounted via a felt or the like, the mounting plate (22) is rotated counterclockwise with the support plate (18). ), The gear (23) is engaged with the intermediate gear (8). Therefore, the reel gear (10) is rotated clockwise through the intermediate gear (8),
Wind the tape in the forward direction. On the contrary, when the gear (20) is rotating clockwise, the mounting plate (22) rotates clockwise, and the rotational force is transmitted to the reel gear (9) via the intermediate gear (7),
The reel gear (9) rotates counterclockwise and winds the tape in the opposite direction. Thus, in the reproduction mode, the reel motor (3) winds the tape.

When the switching piece (25) is pushed down against the spring (24), the 3rd
As shown in the figure, the gear (19) and gear (14) are disengaged,
The rotation of the pulley (21) is transmitted to the gear (20). Therefore, in the same manner as described above, in response to the forward and reverse rotations of the capstan motor (1), the reel gears (9) or (10) rotate selectively and in mutually opposite directions to wind the tape. Will be taken. Thus, in the FF and REW modes, the tape is wound by the capstan motor (1).

As is clear from the above description, the belt (2), the pulley (2
1) and gears (19) (20) (7) (8) constitute the first transmission mechanism for transmitting the rotational force of the capstan motor (1) to the reel drive shafts (9a) (10a). (4), slip mechanism (5), gear (19)
(20) (7) (8) is the reel drive shaft that applies the rotational force of the reel motor (3).
A second transmission mechanism that transmits to (9a) and (10a) is configured.

G. Effect of the Invention According to the present invention described above, high-speed tape winding can be performed in the FF and REW modes, and tape transport and tape winding can be performed in the normal and reverse reproduction modes. There is no timing gap.

[Brief description of drawings]

FIG. 1 is a diagram showing a reel driving device according to the present invention, FIG. 2 is a diagram showing a state in a reproduction mode, and FIG. 3 is an FF, REW.
It is a figure which shows the state in a mode. (1) is a capstan motor, (3) is a reel motor, (5) is a slip mechanism, (6) is a transmission mechanism, (9) and (10) are reel gears, and (9a) and (10a) are reel drive shafts.

Claims (1)

[Scope of utility model registration request] 1. A first drive for transmitting a rotational drive force of a capstan motor to a reel drive shaft in a fast forward and rewind mode.
A transmission mechanism, a second transmission mechanism that transmits the rotational driving force of the reel motor to the reel drive shaft via a slip mechanism in a reproduction mode other than the above modes, and the first and second transmission mechanisms.
Reel drive device having selection means for selectively operating the transmission mechanism