JPH0654570B2 - Magnetic tape device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic tape device applicable to a video tape recorder (hereinafter referred to as VTR), and more particularly to a magnetic tape device having a small tape running load.

2. Description of the Related Art In recent years, VTRs have spread to general households and are used as time shift machines for television programs.

An example of the conventional VTR described above will be described below with reference to the drawings.

FIG. 2 is a plan view of a main part of a conventional VTR.
In FIG. 2, a magnetic tape 4 is wound around a supply reel 2 and a take-up reel 3 which are juxtaposed in a tape cassette 1, and the magnetic tape 4 which is ejected from the supply reel 2 in parallel with the tape cassette 1 is provided with several guides. Member and erasing head 5, first
After being guided by the guide roller 6, it is twisted by the first inclined post 7 and wound around the rotary head cylinder 8 in a hessical manner. Magnetic tape 4 attached with rotating head cylinder 8 attached
Is straightened again by the second tilted post 9 so as to be parallel to the tape cassette 1, and then the traveling direction is changed by the second guide roller 10, and is then contacted with the fixed head 11 and then by the capstan 12 and the pinch roller 13. The magnetic tape 4 is fed into the tape cassette 1 and wound on the take-up reel 3, and the magnetic tape 4 is wound in a substantially M-shape on the rotary head cylinder, and is called an M running system.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above configuration, the first inclined post,
In addition, since the tape winding angle on the second inclined post is large, the tape running load is large, and the fast winding mode in which the magnetic tape 4 is attached to the rotary head cylinder 8 is advantageous in terms of tape damage and power consumption. It was difficult because it consisted of

In view of the above problems, the present invention provides a magnetic tape device that is a traveling system that is attached to a rotary head cylinder in a substantially M-shape and has a small tape traveling load.

Means for Solving the Problems In order to solve the above problems, a magnetic tape device according to the present invention has a first tilted post for twisting a magnetic tape that comes out of a tape cassette in parallel with a main plane, and the first tilted post. A first rotating roller and a second rotating roller which are located between the post and the rotary head cylinder and which come into contact with the magnetic tape to rotate about an axis orthogonal to the running direction of the magnetic tape; and the first inclined post. Located between the rotary head cylinder and the second tilted post, a second tilted post that is opposite to the rotary head cylinder and that makes the twisted magnetic tape parallel to the main plane of the tape cassette. In addition, the third rotation roller that rotates about an axis orthogonal to the running direction of the magnetic tape by contacting the magnetic tape is provided.

Action The present invention has the above-described configuration, whereby the tape winding angle on the first inclined post and the second inclined post is extremely small, and a traveling system with a small tape traveling load can be configured.

Embodiment A VTR according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a plan view of the essential parts of a VTR according to an embodiment of the present invention.

In FIG. 1, a magnetic tape 24 is wound around a supply reel 22 and a take-up reel 23 which are arranged side by side in the tape cassette 21, and the magnetic tape 24 that has come out from the supply reel 22 in parallel with the tape cassette 21 is several. After being guided by the guide member and twisted by the first inclined post 29 to change the traveling reference plane, the traveling direction is changed by the first rotating roller 30, the erasing head 31, and the second rotating roller 32, and the rotating head cylinder. It wraps around 26 in a hessian manner. The magnetic tape 24 that has come out of contact with the rotary head cylinder 26 is changed in direction by the third rotary roller 33, and then corrected by the second inclined post 34 so as to run parallel to the tape cassette 21 again. A guide member, a voice erasing head 36, a recording head 37, a capstan 38, and a pinch roller 40 feed the tape cassette 21 toward the tape cassette 21 and wind the reel 23.

The height of the lead provided on the rotary head drum 26 is set to be slightly lower than the lower end of the magnetic tape 24 in the tape cassette 21 at the point where the rotary head 26 comes closest to the tape cassette 21. The guide member 28 is the tape cassette 2
The magnetic tape 24 is pulled out from the inside of the tape cassette 21 by rotating at 28 'in the position 1 with 28 "as a fulcrum.
The second rotary roller 32 also moves from the position 32 'in the tape cassette 21 and pulls out the magnetic tape 24 from the tape cassette 21 as shown in FIG. Rotating head cylinder 2
Also on the downstream side of 6, the third rotary roller 33 and the second inclined post 34 move from the positions 33 'and 34' in the tape cassette 21 as shown in FIG.
4 is pulled out from the tape cassette 21 and wound around the rotary head cylinder 26.

The rotary head cylinder 36 is tilted in the direction of arrow 37. When the specifications of the rotary head cylinder 36 are outer diameter = φ76, lead angle = 4.25 °, tape winding angle = 216 °, tilt direction = 252 °, tilt angle = 5 °, specifications of each guide material Is shown in the table below.

The angle is from the center of the supply reel 22 to the take-up reel 23.
The line going to is 0 ° and the counterclockwise direction is +.

With the above-described configuration, the tape winding angle on the first inclined post 29 and the second inclined post 34 in the tape traveling system can be made extremely small. In the conventional M traveling system shown in FIG. 2, when the rotary head cylinder diameter and the tape winding angle are matched with those of the embodiment of the present invention, the tape winding angle on the first and second inclined posts is about 140 °. On the other hand, in the embodiment of the invention, the tape wrap angle on the first and second inclined posts is about 60.
The tape winding angle is greatly reduced, and a tape traveling system with a small tape traveling load can be constructed. The rotation guide member is designed to rotate about an axis orthogonal to the magnetic tape running direction by contacting the magnetic tape.

As described above, according to the present invention, the first inclined post and the second inclined post are provided.
The total tape wrap angle around the inclined post is reduced, and the tape running load can be reduced. Further, since the guide member and the magnetic tape are not arranged behind the rotary head cylinder, there is an effect that the space occupied by the tape running system is small.

[Brief description of drawings]

FIG. 1 is a plan view of the essential parts of a magnetic tape device according to an embodiment of the present invention, and FIG. 2 is a plan view of the essential parts of a conventional magnetic tape device. 21 ... tape cassette, 22 ... supply reel, 23 ...
… Take-up reel, 26 …… Rotating head drum, 29 ……
First tilting post, 30 ... First rotating roller, 32 ...
2nd rotary roller, 33 ... 3rd rotary roller, 34 ... 2nd inclination post, 38 ... Capstan, 40 ... Pinch roller

Claims (1)

[Claims] 1. A tape cassette having a pair of tape reels arranged parallel to each other in parallel to a main plane and having magnetic tape wound therein, and a rotary head drum for drawing out the magnetic tape from the tape cassette and winding the tape in a substantially M-shape. A first tilted post for twisting the magnetic tape that has come out of the tape cassette in parallel with the main plane, and a magnetic tape that is between the first tilted post and the rotary head cylinder and is in contact with the magnetic tape. The first rotating roller and the second rotating roller which rotate about an axis orthogonal to the traveling direction, the first tilted post and the rotating head cylinder, which are on the opposite side to each other, and the twisted magnetic tape is the tape. A second tilted post parallel to the main plane of the cassette, between the rotary head cylinder and the second tilted post, and magnetic tape Magnetic tape unit, characterized in that provided with the third rotating roller which rotates about an axis perpendicular to the running direction of the magnetic tape by contacting.