JPH04321961A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the image flickering due to tension fluctuation by preventing the gravity falling of a cassette reel to occur due to the presence of the clearance between the reel hook of a supply reel stand and a cassette reel groove part. CONSTITUTION:By applying urethane resin 1 having tackiness with a reel hook part 5 of a supply reel stand, the reel hook part 5 of the upper part of the supply reel base and the internal groove of the reel are always abutted during the usual reel rotation. Thus, the tension fluctuation due to the gravity falling of the supply reel base is prevented and the image flickering at the time of the recording and reproducing is prevented.

Description

[Detailed description of the invention]

0001

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

0002

2. Description of the Related Art Magnetic recording and reproducing apparatuses using magnetic tape are widely used as magnetic recording and reproducing apparatuses, such as for household magnetic recording and reproducing purposes and for magnetic recording and reproducing purposes in computers.

The prior art will be explained below with reference to the drawings. FIG. 2 is a sectional view of a supply reel stand of a conventional magnetic recording and reproducing device.
FIG. FIG. 3 is an explanatory diagram of the configuration of the supply reel stand. 2 and 3, 2 is a reel cap, 3 is a regulating spring, 4 is a supply reel stand, 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 constructed as described above will be explained below with reference to FIGS. 2 to 4.

As shown in FIG. 2, the reel hook 5 of the conventional supply reel stand has a pawl divided into three equal parts. Further, as shown in FIG. 3, the reel hub 6 on which the magnetic tape 9 is usually wound is the supply reel stand 4 of the magnetic recording/reproducing device.
is fixed by a leaf spring 7 inside the cassette. At the same time, Figure 4
As shown in , the reel hook 5 is inserted into the groove inside the reel hub 6 , and the rotational force of the supply reel stand 4 causes the reel hook 5 on the upper part of the supply reel stand 1 to come into contact with the groove inside the reel hub 6 . Transmission becomes possible.

Next, as shown in FIGS. 3 and 4, the supply reel stand 4 is rotating in a vertical position in the direction of gravity A, and the magnetic tape 9 is rotating in a direction C while applying back tension in the direction B.
B of the reel hub 6 when the tape is running in the direction
Explain the movement when rotating in direction.

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 is smaller than the gravity W of the reel hub 6. Then, the reel hub 6 falls due to its own weight by the distance of the gap Z between the outer diameter of the reel hook 5 and the inner diameter of the inner groove of the reel hub 6. Normally, this gap Z is set to about 0.1 to 0.2 mm so that the reel hub 6 and the reel cap 2 can be smoothly fitted even if the environment changes. The tension of the magnetic tape 9 fluctuates due to this fall of its own weight.

[0008]

In the conventional magnetic recording/reproducing apparatus, tension fluctuation occurs due to the falling weight of the supply reel stand during rotation, which causes image wobbling in recorded and reproduced images.

[0009]

[Means for Solving the Problems] In order to solve the above problems, the magnetic recording/reproducing device of the present invention coats the reel hook portion of the supply reel stand with an adhesive urethane resin, and the magnetic recording/reproducing apparatus coats the reel hook part of the supply reel stand, and the magnetic recording/reproducing apparatus coats the reel hook part of the supply reel stand. This aims to increase the frictional force between the reel hook part on the upper part of the reel stand and the groove part inside the reel hub.

0010

[Function] By the means described above, it is possible to prevent tension fluctuations caused by falling of the supply reel stand due to its own weight during rotation, and to prevent image wobbling during recording and reproduction.

[0011]

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 stand 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 regulation spring, and 4 is a supply reel stand.

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

As shown in FIG. 3, a reel hub 6 on which a magnetic tape 9 is usually wound is attached to a supply reel stand 4 of a magnetic recording/reproducing apparatus.
is fixed by a leaf spring 7 inside the cassette. At the same time, Figure 5
As shown in the figure, the reel hook 1 is inserted into the internal groove of the reel hub 6, and the rotational force of the supply reel stand 4 is transmitted when the reel hook 5 on the upper part of the supply reel stand 4 comes into contact with the internal groove of the reel hub 9. becomes possible.

Next, as shown in FIGS. 3 and 5, the supply reel stand 4 is rotating in a vertical position in the gravity direction A, and the magnetic tape 9 is rotating in the F direction while applying back tension in the G direction. Reel hub 6 when running tape
The movement when rotating in the E direction will be explained.

During normal rotation, the reel hub 6 contacts the reel hook 5 at three Y points and rotates in the E direction. However, even when the reel hub 6 rotates to the position shown in FIG. 5, the holding force obtained at point M is greater than the gravity W of the reel hub 6. It is possible to keep the internal grooves of the parts in constant contact with each other. Therefore, it is possible to prevent the tension from fluctuating due to the fall of the reel hub 6 due to its own weight.

[0017]

[Effects of the Invention] As explained above, according to the present invention,
It is possible to prevent tension fluctuations due to falling weight of the supply reel stand during rotation, and to prevent image wobbling during recording and reproduction.

[Brief explanation of drawings]

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

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

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

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

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

[Explanation of symbols]

1 Urethane resin 2 Reel cap 3 Regulation spring 4 Supply reel stand 5 Reel hook 6 Reel hub 7. Leaf spring 8 Cassette 9 Magnetic tape

Claims (1)

[Claims] 1. A magnetic recording and reproducing apparatus for recording or reproducing information on the magnetic tape, comprising means for driving a magnetic tape, a supply reel, and a reel hook that fits into a reel hub groove of a cassette on the supply reel, wherein the reel A magnetic recording/reproducing device characterized by coating a hook with adhesive resin.