JP2979699B2 - Magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus using a magnetic tape such as a video tape recorder as a recording medium.

[0002]

2. Description of the Related Art A magnetic recording / reproducing apparatus using a magnetic tape is widely used as a magnetic recording / reproducing apparatus for home magnetic recording / reproducing or computer magnetic recording / reproducing.

The prior art will be described below with reference to the drawings. FIG. 2 is a cross-sectional view of a supply reel base of the conventional magnetic recording and reproducing apparatus,
It is a top view. FIG. 3 is an explanatory diagram of the configuration of the supply reel base. 2 and 3, 2 is a reel cap, 3 is a setting spring, 4 is a supply reel base, 5 is a reel hook, 6 is a reel hub, 7 is a leaf spring, 8 is a cassette, and 9 is a magnetic tape.

The operation of the conventional magnetic recording / reproducing apparatus configured as described above will be described below with reference to FIGS.

As shown in FIG. 2, the reel hook 5 of the conventional supply reel base has a configuration having three equally-divided claws. As shown in FIG. 3, the reel hub 6 around which the magnetic tape 9 is usually wound is connected to the supply reel table 4 of the magnetic recording / reproducing apparatus.
Is fixed by a leaf spring 7 in the cassette. At the same time FIG.
As shown in FIG. 7, the reel hook 5 is inserted into the groove inside the reel hub 6, and the rotational force of the supply reel base 4 is brought into contact with the reel hook 5 above the supply reel base 1 by contact with the groove inside the reel hub 6. Communication becomes possible.

Next, as shown in FIGS. 3 and 4, the supply reel base 4 is rotated in a vertical posture in the direction of gravity A, and the magnetic tape 9 applies the back tension in the direction B, and
B of the reel hub 6 when the tape is running in the direction
The movement when rotating in the direction will be described.

During normal rotation, the reel hub 6 contacts the reel hook 5 at three X points and rotates in the D direction.
However, when the reel hub 6 rotates to the position shown in FIG.
The holding force obtained at the point X becomes smaller than the gravity W of the reel hub 6. Then, the reel hub 6 falls by its own weight by the distance of the gap Z between the outer diameter of the reel hook 5 and the inner groove of the reel hub 6. Usually, the gap Z is set to about 0.1 to 0.2 mm so that the fitting between the reel hub 6 and the reel cap 2 can be smoothly performed even if there is an environmental change. The tension of the magnetic tape 9 fluctuates due to this weight drop.

[0008]

In the conventional magnetic recording / reproducing apparatus, the tension changes due to the weight drop of the supply reel table while the supply reel table is rotating, so that the image to be recorded / reproduced is shaken.

[0009]

In order to solve the above-mentioned problems, a magnetic recording / reproducing apparatus according to the present invention applies an adhesive urethane resin to a reel hook portion of a supply reel table, and supplies the urethane resin during rotation of the supply reel table. The frictional force between the reel hook on the reel base and the groove inside the reel hub is increased.

[0010]

According to the above-mentioned means, it is possible to prevent a tension fluctuation caused by a fall of its own weight while the supply reel base is rotating, and to prevent an image shake during recording and reproduction.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A magnetic recording / reproducing apparatus according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a supply reel table of a magnetic recording / reproducing apparatus according to an embodiment of the present invention. In FIG. 1, 1 is a urethane resin, 2 is a reel cap, 3 is a setting spring, and 4 is a supply reel base.

The operation of the magnetic recording / reproducing apparatus according to one embodiment of the present invention configured as described above will be described below with reference to FIGS. 1, 3 and 5.

As shown in FIG. 3, the reel hub 6 around which the magnetic tape 9 is normally wound is connected to the supply reel table 4 of the magnetic recording / reproducing apparatus.
Is fixed by a leaf spring 7 in the cassette. Fig. 5
As shown in (1), the reel hook 1 is inserted into the internal groove of the reel hub 6, and the rotational force of the supply reel base 4 is transmitted by the reel hook 5 on the upper part of the supply reel base 4 contacting the groove inside the reel hub 9. Becomes possible.

Next, as shown in FIGS. 3 and 5, the supply reel base 4 is rotating in a vertical posture in the direction of gravity A, and the magnetic tape 9 applies back tension in the direction G while moving in the direction F. The movement of the reel hub 6 during rotation in the direction E when the tape is running will be described.

The reel hub 6 rotates at the three Y points of the reel hook 5 during the normal rotation operation and rotates in the E direction.
However, even when the reel hub 6 is rotated to the position shown in FIG. 5, since the holding force obtained at the point M is larger than the gravity W of the reel hub 6, the reel hook 5 and the reel hub 6 above the supply reel table during the rotation of the supply reel table. Can always be in contact with the internal groove portion. For this reason, it is possible to prevent tension fluctuation due to the weight of the reel hub 6 falling.

[0017]

As described above, according to the present invention,
It is possible to prevent a fluctuation in tension due to a fall of its own weight during rotation of the supply reel table, and to prevent image fluctuation during recording and reproduction.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view and a plan view showing a configuration of a supply reel base in one embodiment of a magnetic recording / reproducing apparatus of the present invention.

FIG. 2 is a sectional view and a plan view of a conventional supply reel base.

FIG. 3 is an explanatory view of an embodiment and a conventional example.

FIG. 4 is an operation explanatory diagram of a conventional example.

FIG. 5 is an operation explanatory diagram of the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 urethane resin 2 reel cap 3 setting spring 4 supply reel base 5 reel hook 6 reel hub 7 leaf spring 8 cassette 9 magnetic tape

Claims (1)

(57) [Claims] 1. A magnetic recording / reproducing apparatus for recording or reproducing data on or from a magnetic tape, comprising: means for driving a magnetic tape, a supply reel, and a reel hook fitted on the reel hub groove of the cassette on the supply reel. A magnetic recording / reproducing apparatus, wherein an adhesive resin is applied to a hook.