JPH0462424B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a device for running and driving a tape by pinching it between a pinch roller and a campus shaft, and particularly for a device for running a magnetic tape such as a cassette-type video tape recorder from a tape cassette. This is effective when it is pulled out and pressed against the capstan shaft.

Prior Art A conventional tape drive device will be described with reference to FIG. Figure 3 shows an example implemented in a video tape recorder (hereinafter abbreviated as VTR).
In the figure, 1 indicates a take-up reel 2, a supply reel 3, a magnetic tape 4 wound on these reels, and openings 5 and 6 through which the magnetic tape 4 can be pulled out.
It is a tape cassette with 7a, 7b,
7c, 8a, and 8b are tape cassette 1.
When it is set in the specified place on the VTR body,
When the magnetic tape 4 is located in the openings 5 and 6 and a recording or reproducing operation is performed, the magnetic tape 4 is pulled out from the position shown by the chain line to the position shown by the solid line, that is, wrapped around the outer periphery of the rotary head cylinder 9 in an inverse Ω shape, and then runs. This is a guide member that guides the 10 is a sharpstan shaft for driving the magnetic tape 4 to travel at a constant speed;
Here it is rotating counterclockwise. 11 rotates around a support shaft 12 so that it can be moved between a first position shown by a dotted line located inside the opening 6 of the tape cassette 1 and a second position shown by a solid line where it is in pressure contact with the capstan shaft 10. This is a pinch roller rotatably supported at the tip of a moving arm 13. In the figure, 14 is a magnetic head for recording/reproducing audio signals and control signals, and 15 is a tape guide post disposed in the magnetic tape running path between the magnetic head 14 and the capstan shaft 10.

Problems to be solved by the invention However, in the conventional example shown in FIG.
In the tape feeding state in which the magnetic tape 4 is pressed against the capstan shaft 10 by the pinch roller 11, the winding angle of the magnetic tape 4 with respect to the pinch roller 11 is large, so that problems such as wow and flutter occur when the magnetic tape 4 runs. It was hot. This is because when the outer circumferential surface of the pinch roller 11 is viewed microscopically, it has many uneven surfaces, and the larger the surface of the magnetic tape in contact with the uneven surface, the worse the constant speed running performance of the magnetic tape becomes. Conceivable.

For this reason, as illustrated in FIG. 4, by extending the tip of the arm 13 and providing a tape guide post 16 at the tip, the angle at which the magnetic tape 4 is wrapped around the pinch roller 11 can be reduced. It is also possible to do so.

However, even with this method, the following problems remain. That is, FIG. 5 is a side view of the main part of FIG. 4 viewed from the direction of arrow A, and shows that the pinch roller 11 is uniformly pressed against the capstan shaft 10 rotating counterclockwise via the magnetic tape 4. This shows a state in which the magnetic tape 4 is being driven to run in the direction of arrow B. In this state, the axes of the pinch roller 11 and the guide post 16 are parallel to the axis of the capstan shaft 10.

However, due to the repetition of the pressing operation of the pinch roller 11 against the capstan shaft 10 many times, the rotational axis y' of the pinch roller 11 is tilted by θ degrees with respect to the normal rotational axis y. The horizontality of the arm 13 is impaired. As a result, since the tape guide post 16 is also inclined with respect to the castan axis 10, a slack portion 4a of the magnetic tape 4 is generated, resulting in a problem that the constant speed running performance of the magnetic tape 4 is deteriorated. This is tape guide post 1
6 is implanted near the portion of the arm 13 where the pinch roller 11 is supported, the deformation of the arm 13 due to the support shaft of the pinch roller 11 directly affects the support portion of the tape guide post 16. This is because it is caused by

In view of the above-mentioned problems, the present invention has been developed so that even if the axial center of the pinch roller is inclined with respect to the axial center of the capstan shaft, the axial center of the tape guide post, that is, the tape running guide body is not inclined or tilted. The purpose of this invention is to eliminate tape slack and provide a tape drive device with minimal wow and flutter by minimizing the amount of tape slack.

Means for Solving the Problems In order to solve the above problems, the tape drive device of the present invention has a base that is rotatably supported on a base body by a support shaft, and that extends in a predetermined direction from the base. A rotating member having a first arm and a second arm extending from the base along the first arm is used, and a pinch roller is freely rotatable at or near the tip of the first arm. A tape running guide (tape guide post) is provided at or near the tip of the second arm.

Effect With the above configuration, even if the first arm deforms for some reason and the pinch roller comes into pressure contact with the capstan shaft at an angle, the deformation of the first arm will not occur. Since it does not reach the second arm, or even if it does, it is very small, the running performance of the tape will not become unstable.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the main parts showing an example in which the present invention is implemented in a cassette type VTR, FIG. 2 is a side view of the main parts as seen from the direction of arrow C in FIG. 1, and FIGS. Components having the same functions as those described above are given the same reference numerals, and redundant explanations here will be omitted. In FIG. 1, reference numeral 17 includes a first arm 17a whose base 17c is rotatably supported by a base body through a support shaft 18, and which extends in a predetermined direction from the base 17c, and a first arm 17a extending from the base 17c in a predetermined direction. The second arm 17 extends along (including cases where it almost runs along) the arm 17a of
A pinch roller 11 is rotatably supported at or near the first tip of the second arm 17b, and a tape running member is rotatably supported at or near the first tip of the second arm 17b. A tape guide post 16 serving as a guide is provided. In this case, the tape guide post 16 is
In the state where the pinch roller 11 is in pressure contact with the capstan shaft 10, the tape guide post 1 is located upstream of the pressure contact point between the pinch roller 11 and the capstan shaft 10 with respect to the tape running direction.
6, a direction away from the tape cassette 1 with respect to a straight line G connecting the tape contact surface of another tape running guide, that is, the tape guide post 15, and the tape contact surface of the pinch roller 11. It is located on the side of

Further, the rotating member 17 is configured to rotate the tape cassette 1.
When set in the specified position on the VTR body,
A non-drawing position where the pinch roller 11 is located inside the magnetic tape 4 located in the opening 6 (indicated by a dotted line in FIG. 1), and a drawn-out position where the magnetic tape 4 is pulled out from the opening 6 and pressed against the campus shaft 10. (shown as a solid line in Figure 1)
It is configured to be rotationally driven by.

With the above configuration, if for some reason, such as a defect in the rotational shaft structure of the pinch roller 11, the rotational axis y' of the pinch roller 11 changes from its normal rotation as shown in FIG. Even if it is tilted by an angle θ with respect to the axis y, the displacement only affects the first arm 17a and does not extend to the adjacent second arm 17b, or even if it does, it is extremely small. , tape guide post 1
The axis of the capstan 6 remains parallel to the capstan shaft 10 and is not tilted, and even if it is tilted, it is minimal. Therefore, the magnetic tape 4 does not slacken significantly at the tape guide post 16. Of course, in this embodiment, the action of the tape guide post 16 reduces the angle at which the magnetic tape 4 wraps around the pinch roller 11, so the occurrence of wow and flutter is suppressed, and in conjunction with the above-mentioned effects, The magnetic tape can be driven to run stably.

Effects of the Invention As is clear from the above description, according to the tape drive device of the present invention, the action of the tape running guide (corresponding to the tape guide post 16 in the above embodiment) reduces wow and flutter during tape running. In addition, by attaching the tape running guide to the one arm of the rotating member having first and second arms and providing a pinch roller on the other arm, the occurrence of the pinch roller can be suppressed. Even if the rotational axis is inclined with respect to the capstan axis, the magnetic tape can be stably run and driven, which is an extremely excellent effect.In particular, as in the above-mentioned embodiment, a pinch roller is used. When implemented in a VTR having a structure in which a part of the magnetic tape is drawn out from the tape cassette and pressed into contact with a capstan shaft disposed outside the tape cassette, it brings about great effects.

[Brief explanation of the drawing]

FIG. 1 is a plan view of essential parts of an example of a VTR embodying the present invention, FIG. 2 is a view taken in the direction of arrow C in FIG.
Figure 3 is a plan view of the main parts of a VTR to explain the conventional example, and Figure 4 can be considered as an improvement on the conventional example.
The main part plan view of the VTR, Figures 5 and 6 are shown in Figure 4.
It is a view taken in the direction of arrow A in the figure. 1... Tape cassette, 4... Magnetic tape, 6
...Opening, 10... Capstan shaft, 11... Pinch roller, 15, 16... Tape guide post, 17... Rotating member, 17a... First arm, 17b... Second arm, 17c... …base,
18...Spindle.

Claims (1)

[Scope of Claims] 1. The base is rotatably supported on the base body by a support shaft,
and a rotating member having a first arm extending in a predetermined direction from the base and a second arm extending from the base along the first arm;
a pinch roller that is rotatably supported at or near the tip of the arm; a capstan shaft that drives the tape to travel by being pressed against the pinch roller via the tape during tape feeding; and the second arm. A tape drive device comprising a tape running guide provided at or near the tip of the tape drive device. 2. When the pinch roller is in pressure contact with the capstan shaft, the tape running guide is located upstream of the point of pressure contact between the pinch roller and the capstan shaft and immediately upstream of the tape running guide with respect to the tape running direction. Claim 1, characterized in that the tape is located outside of a straight line connecting the tape contact surface of another tape running guide provided and the tape contact surface of the pinch roller.
The tape drive described in Section 1. 3. When a tape cassette having an opening that allows the tape to be pulled out is set in a predetermined position, the rotating member can move the tape between a non-drawing position where the pinch roller is located inside the tape located at the opening, and a non-drawing position where the pinch roller is located inside the tape located at the opening. The tape drive device according to claim 1 or 2, wherein the tape drive device is configured to be rotatably driven so as to be able to move between a drawer position where the tape drive device is pulled out from the opening and brought into pressure contact with the capstan shaft. .