JPH082802Y2 - VTR tape guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a tape guide device for a VTR equipped with a rotary magnetic head cylinder having a rotary magnetic head and an erasing head fixedly arranged outside the cassette.
In particular, the present invention relates to a tape guide device capable of high speed erasing.

Prior Art FIG. 3 is a plan view showing a tape loading mechanism of a conventional VTR, and sliders A and B are indicated by broken lines A'and B '.
By moving from the position of to the position shown by the solid line,
The tape path (a) (shown by a chain double-dashed line) and the tape path for recording / playback (a) (shown by a one-dot chain line) at the time of fast-forwarding / rewinding can be alternately taken.

That is, when the sliders A and B are in the recording / reproducing state shown by the solid line, the tape T drawn from the tape reel 2
After passing through the posts 3 and 4 in the cassette 1, it is bent by the tension post 5 and slightly wraps around the impedance roller 6, and then contacts the erasing head 7, and then the slider A at the position shown by the solid line. The vertical post 8 and the inclined post 9 change the direction, and the winding is wound around the rotary magnetic head cylinder 10 for about half a round or more, and further, contact the impedance roller 13 via the inclined post 11 and the vertical post 12 of the slider B at the position shown by the solid line. To do.

The tape T that has passed through the impedance roller 13 is subjected to an erasing process as necessary via the erasing head 14, and after contacting the recording surface of the recording / reproducing head 15 connected thereto, the tape T is moved from the limiter post 16 to the solid line position. A pinch roller
The tape reel 12 passes between the capstan 18 and the reverse traveling limiter post 19, passes between the posts 20 and 21 in the cassette 1, and is wound up on the tape reel 12.

On the other hand, in the fast-forward mode, since it is not necessary to wind the tape T around the rotary magnetic head cylinder 10, the sliders A and B retreat to the positions A'and B'indicated by broken lines, respectively, whereby the posts 4 in the cassette 1 are moved. After passing through the tape T, the tape T slightly contacts the rotary magnetic head cylinder 10 and is then rocked from the solid line position to the broken line position.
After being wound around the vertical post 28 attached to the tip of 28a for about 90 °, it comes into contact with the recording surface of the recording / reproducing head 15 and the pinch roller 17 is retracted to the position indicated by the broken line. Post 16 and pinch roller 17
The tape reel 22 is wound up via the posts 20 and 21 in the cassette 1 without contacting the capstan 18. At the time of rewinding, the tape is wound from the tape reel 22 to 2 through the reverse of the above tape path.

Problems of the Prior Art As described above, in the conventional tape loading mechanism shown in FIG. 3, the arm 28a is swung from the solid line position to the broken line position to store the tape T in the cassette 1, and It is possible to selectively take two positions, that is, a position in the fast forward or rewind mode, and to obtain various information from the tape T for cueing etc. by the recording / reproducing head 15 also in the fast forward or rewind mode. However, in the fast-forward / rewind mode, the tape was not brought into contact with the erasing head 14, and therefore erasing at high speed could not be performed. Further, as described above, in the fast-forward / rewind mode, the tape T is not brought into contact with the erasing head 14 and is brought into contact with the recording / reproducing head 15,
It is necessary to accurately determine the pull-out position of the vertical post 28, which causes a high cost.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a tape guide device which can add a high-speed erasing function in a VTR and can roughly position a vertical post at a pulled-out position.

In order to achieve the above object, the main means adopted by the present invention are as follows: a rotary magnetic head cylinder having a rotary magnetic head, an erasing head fixedly arranged outside the cassette, In a VTR tape guide device that has a vertical post that pulls out the magnetic tape from the cassette during fast forward / rewind and contacts the magnetic tape with the recording / playback head, the magnetic tape erases the vertical post during fast forward / rewind. It is the tape guide device of the VTR according to the point that it is moved to a position where it contacts the head.

Function In this invention, the magnetic tape is brought into contact with the erasing head by the vertical posts even during fast-forwarding and rewinding, and high-speed erasing is performed by the erasing head. In this way, the magnetic tape comes into contact with the erasing head even during fast forward / rewind,
It is no longer necessary to strictly determine the magnetic tape pull-out position by the vertical post.

Embodiment Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2 to provide an understanding of the present invention.

FIG. 1 is a schematic plan view of the entire tape loading mechanism equipped with a tape guide device according to an embodiment of the present invention, and FIG. 2 shows only the main part of the tape guide device shown in FIG. FIG.

In the following description, elements common to those of the conventional apparatus shown in FIG. 3 will be described using the same reference numerals.

However, the following embodiments are merely specific examples of the present invention,
It does not limit the technical scope of the present invention.

The embodiment shown in FIGS. 1 and 2 is different from the conventional apparatus shown in FIG. 3 in that the vertical post 28 is positioned in the fast-forward / rewind mode as shown in detail in FIG. This is different from the position 28 'shown by. That is, since the position of the vertical post 28 in the fast-forward / rewind mode is positioned at a position displaced outward from the conventional tape path, the winding angle from the vertical post 28 to the erasing head 14 is This is an increase compared to the conventional tape path, which enables the erasing process when the tape is fast forwarded and rewound by the erasing head 14.

In this way, if the winding angle θ of the erasing head 14 by the vertical post 28 is set to the maximum, there is no problem in signal transmission when the winding angle is slightly increased, so the positioning accuracy of the vertical post 28 can be rough. It will be. That is, since the vertical post 28 may be positioned anywhere within the range indicated by θ in the drawing, its mounting accuracy does not pose a problem and cost reduction in terms of component accuracy and inspection accuracy is possible.

Effect of the Invention As described above, the present invention has a rotary magnetic head cylinder having a rotary magnetic head, an erasing head fixedly arranged outside the cassette, and a magnetic tape pulled out from the cassette at the time of fast forward / rewind. In a tape guide device of a VTR equipped with a recording / reproducing head and a vertical post for contacting the magnetic tape, the vertical post is moved to a position where the magnetic tape contacts the erasing head during fast forward / rewind. Since it is a featured VTR tape guide device, the magnetic tape is brought into contact with the erasing head even in the fast-forward / rewind mode, so high-speed erasing can be performed and the winding angle around the magnetic head can be adjusted roughly. Even if it does not cause any problems, it is possible to realize the cost reduction due to the deterioration of the processing accuracy and the assembly accuracy of the parts.

[Brief description of drawings]

FIG. 1 is a schematic plan view of an entire tape loading mechanism equipped with a tape guide device according to an embodiment of the present invention, and FIG. 2 is an enlarged view showing only a main part of the tape guide device shown in FIG. A plan view and FIG. 3 are plan views of the entire conventional VTR tape loading mechanism. (Explanation of symbols) 1 …… Cassette 2 …… Tape reel 10 …… Rotating magnetic head cylinder 14 …… Erasing head, 15 …… Recording / playback head 22 …… Tape reel 28 …… Vertical post, 28a …… Arm.

Claims (1)

[Scope of utility model registration request] 1. A rotary magnetic head cylinder having a rotary magnetic head, an erasing head fixedly arranged outside the cassette, a magnetic tape pulled out from the cassette at the time of fast-forwarding and rewinding, and the magnetic tape is read to a recording / reproducing head. A VTR tape guide device having a vertical post to be brought into contact with the VTR tape guide device, wherein the vertical post is moved to a position where the magnetic tape comes into contact with the erasing head at the time of fast-forwarding and rewinding. .