JPH0945039A - Reel - Google Patents

Abstract

(57) [Summary] [Object] To provide a reel mechanism that can reduce the thickness of the device body by stabilizing the tape running at high speed and shortening the mounting stroke between the reel and the reel stand. To do. When the reel 5 is mounted on the reel base 10, it is the reference protrusion 5e and the protrusion 5f of the reel 5 that are in contact with the reel receiving portion 10b of the reel base 10. Wearing stability can be achieved. Further, since the rotational force is transmitted by the engagement between the projection 5f formed on the lower portion of the reel 5 and the reel driving pawl 11, the engagement stroke is shortened and the thickness of the apparatus main body can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel of a cassette used in a magnetic recording / reproducing device such as a video tape recorder and various other information processing devices.

[0002]

2. Description of the Related Art In recent years, with the increasing density of magnetic recording, tape cassettes and video tape recorders (hereinafter referred to as VTRs) have become compact. As a result, the reel accommodated in the tape cassette is also made thinner and smaller. Hereinafter, the conventional reel described above will be described with reference to the drawings.

FIG. 8 is a sectional view of a conventional reel 13. As shown in FIG. 8, the reel body 13a has a cylindrical drum 13b around which the tape 14 is wound and a lower flange 13c that regulates the height direction of the lower end of the tape 14 integrally formed of synthetic resin. Further, an upper flange 13d separately formed of synthetic resin is coupled to the upper portion of the reel body 13a.

The reference protrusion 13e is formed on the lower portion of the lower flange 13c and hits the reel stand on the apparatus side to contact the drum 13b.
The running height direction of the tape 14 wound around is restricted. Above the inside of the drum 13b, there are a plurality of reel claw engaging projections 13f that engage with engaging claws provided on the reel stand on the apparatus side, and below the reel claw engaging projections 13f, there are provided on the reel stand. A fitting portion 13g that fits into a cylindrical reel fitting portion that positions the center of rotation is provided.

Next, the reel stand on the apparatus side will be described with reference to FIG. FIG. 9 is a sectional view of the reel stand 16. A reel stand body 16a is rotatably held on a shaft 15 vertically erected on a base (not shown). The reel stand body 16a is provided with a reel receiving portion 16b that regulates the height of the reel 13 and a reel fitting portion 16c that is fitted into the fitting portion 13g of the reel 13 to perform positioning. A rubber sheet 17 is attached to the upper surface of the reel receiving portion 16b in order to stabilize the contact with the reel 13.

A stopper 18 is press-fitted at the tip of the reel stand body 16a. Further, a reel driving claw 19 having a plurality of engaging claws is fitted and inserted in the center of the reel stand body 16a, and is pressed upward by a spring 20 and held in a state of abutting against the stopper 18 described above. There is. FIG. 10 is a sectional view when the reel 13 is mounted on the reel stand 16. When the reel 13 is attached to the apparatus, as shown in FIG. 10, the reference protrusion 13e of the reel 13 and the reel stand main body 1 are provided.
The rubber sheet 17 stretched on the reel receiving portion 16b of 6a abuts. As a result, the running height of the tape 14 wound around the reel 13 is restricted. Further, the center of rotation of the reel 13 is positioned by fitting the fitting portion 13g of the reel 13 and the reel fitting portion 16c of the reel stand main body 16a.
The rotational force is transmitted by the engagement between the reel driving pawl 19 and the reel pawl engaging protrusion 13f of the reel 13.

[0007]

However, the above-mentioned conventional structure has the following problems. Recent devices and cassettes have been miniaturized as described above, and the speed of fast-forwarding, rewinding, etc. of tapes has become faster. Therefore, a rubber sheet 17 having a high friction coefficient is attached to the reel base 16 that regulates the height of tape travel so that the tape travels stably at high speeds.
The contact between the reel 3 and the reel stand 16 was made more reliable. However, it is the current situation that the thickness E of the reference protrusion 13e cannot be large because the reel 13 itself is also thin and small. As a result, the rubber sheet 17 on the reel stand 16
Since the contact area between the reel portion and the reel 13 is small, the reel mounting is not stable, and the reel 13 is inclined at the time of high-speed rotation to change the tape traveling height, which causes a serious problem of tape damage.

As a countermeasure, the reference protrusion 1 of the reel 13
A method of increasing the thickness E of 3e (see FIG. 8) to F can be considered. However, as described above, the reel 13 is also thin, and if only the reference protrusion 13e is made thick, the other portions are thin, so that the G portion shown in FIG. 8 has a large concave shape. Become. As a result, the cylindricity of the drum 13b and the deflection accuracy of the lower flange 13c are deteriorated, which causes a serious problem that tape damage occurs.

Further, as shown in FIG. 11, when the cassette is horizontally inserted from the cassette insertion opening provided on the apparatus side, the cassette is automatically further pulled in the horizontal direction and then moved in the vertical direction to move the cassette to a predetermined position. There is a device for automatic cassette loading. In such a cassette automatic loading device 22, when the cassette 23 is inserted in the horizontal direction, the lower surface of the cassette 23 passes above the reel base 16 and then the cassette 23 moves in the vertical direction to move the reel 13 and the reels. The mounting with the table 16 is completed. However, in this mounting, as shown in FIG. 10, it was necessary to deeply insert the reel base 16 up to the reel claw engaging protrusion 13f in the inner part of the drum 13b. As a result, the height H of the reel stand 16 becomes long, and the height H of the reel stand 16 affects the thickness I of the apparatus main body 22 to increase the thickness of the apparatus.

In view of the above problems, the present invention aims to improve the stability of the reel mount and the reel stand while ensuring the accuracy of the drum and the flange of the reel to improve the stability when the tape is running at a high speed, and at the same time, reel to reel. It is intended to provide a reel in which a mounting stroke with a stand can be shortened and a thickness of an apparatus main body can be reduced.

[0011]

In order to solve the above-mentioned problems, the reel of the present invention has a reference protrusion for controlling the height direction of tape running formed below the drum portion and at the center of the drum. The protrusion extending toward the inside is provided inside the reference protrusion.

[0012]

According to the present invention, the contact area with the reel stand on the apparatus side is increased by the above-described structure, that is, by forming the protrusion on the reference protrusion of the reel. As a result, it is possible to stabilize the mounting of the reel and the reel stand. Further, since the reference protrusion and the protrusion are formed on the lower portion of the reel, the rotational force can be transmitted to the reel by engaging the reel drive claw of the reel stand with the protrusion of the reel. As a result, the engagement stroke is shortened, and the device body can be made thinner.

[0013]

Embodiments of the present invention will be described below. FIG. 1 is an exploded perspective view of a tape cassette accommodating a reel according to an embodiment of the present invention, and FIGS. 2 and 3 are a sectional view and a bottom view of the reel according to the present embodiment. As shown in FIG. 1, the cassette body constituting the tape cassette 1 is composed of a rectangular upper half 2 and a lower half 3 formed of synthetic resin. And these upper half 2 and lower half 3
Are assembled with each other from the top and bottom and screwed with a set screw to form an integral casing. A pair of reels 5 around which the tape 4 is wound are housed in the cassette body, and the reel pressing spring 6 attached to the upper half 2 constantly presses the reel 5 toward the lower half 3.

On the front surface of the cassette body, there is provided an opening 7 into which the tape pull-out member on the apparatus side is inserted. Then, the tape 4 is stretched along the opening 7. The plurality of lids 8 are configured to cover the tape 4 stretched around the opening 7 as shown in FIG.

As shown in FIG. 2, in the reel body 5a, a cylindrical drum 5b around which the tape 4 is wound and a lower flange 5c which regulates the height direction of the lower end portion of the tape 4 are integrally formed of synthetic resin. . In addition, an upper flange 5d separately molded from a transparent synthetic resin is provided on the reel body 5a.
Are coupled to the upper surface of the drum 5b. Reference numeral 5e is a reference protrusion which is formed in an annular protrusion on the lower portion of the lower flange 5c and which regulates the running height direction of the tape 4 wound around the drum 5b by hitting the reel stand on the apparatus side. Further, inside the reference protrusion 5e, there are provided a plurality of protrusions 5f extending toward the center of the reel and forming the same plane as the reference surface of the reference protrusion 5e.

A plurality of reel claw engaging projections 5g which engage with engaging claws provided on the reel stand on the apparatus side are provided on the upper part inside the drum 5b, and the reels are provided below the reel claw engaging projections 5g. A fitting portion 5h, which is fitted to a cylindrical reel fitting portion for positioning the center of rotation provided on the table, is provided. Reference numeral 5i is a pivot, which is constantly pressed by a reel pressing spring 6 provided in the tape cassette 1 to urge the reel 5 as a whole downward.

Since the reel stand on the apparatus side is the same as that of the conventional example, its description is omitted here. The mounting of the reel 5 and the reel base 16 configured as above will be described. FIG. 4 is a sectional view when the reel 5 is mounted on the reel stand 16. As shown in FIG. 4, when the reel 5 is attached to the apparatus, the reference protrusion 5e and the protrusion 5f of the reel 5 pressed to the reel base 16 side by the reel pressing spring 6 are attached to the reel receiving portion 16b of the reel base body 16a. The rubber sheet 17 is brought into contact with the rubber sheet 17. As a result, the running height of the tape 4 wound around the reel 5 is restricted. Further, the rotation center of the reel 5 is positioned by fitting the fitting portion 5h of the reel 5 and the reel fitting portion 16c of the reel stand body 16a, and the rotational force of the reel drive claw 19 of the reel stand 16 and the reel 5 is set. It is transmitted by engagement with the reel claw engagement protrusion 5g.

At this time, it is the reference protrusion 5e and the protrusion 5f of the reel 5 that are in contact with the rubber sheet 17 attached to the reel receiving portion 16b of the reel stand body 16a, so that the contact area is smaller than that of the conventional example. It also increases the stability of wearing. Therefore, since the mounting is stable even when the reel 5 is rotated at a high speed, the reel 5 does not tilt and the tape 4 fed from the reel 5 also travels stably.

Further, as shown in FIG. 3, the width A of the projection 5f is made substantially equal to the width B of the reference projection 5e, so that the thickness of each part of the reel 5 as a whole is made uniform and at the time of sink and molding. It is possible to improve the precision of each part of the reel 5 by making the applied stress uniform. Next, if the reel base structure of the automatic cassette loading apparatus is configured as shown in FIG.

As shown in FIG. 5, the reel stand 10 has a reel stand body 10a rotatably held about a shaft 9 vertically erected on a base (not shown) as a rotation center. On the upper surface of the outer peripheral portion of the reel stand body 10a, there is formed a reel receiving portion 10b that comes into contact with the reference protrusion 5e and the protrusion 5f of the reel 5. Further, a cylindrical reel fitting portion 10c for positioning the rotation center of the reel 5 is integrally formed in the central portion of the reel stand body 10a.

Reel receiving portion 10b and reel fitting portion 10c
There is an annular recess 10d between the recess 10d and the recess 10d.
Is provided with a reel driving claw 11 which is slidably supported in the vertical direction. Further, the spring 12 causes the reel driving pawl 1 to
1 is urged upward. Reference numeral 13 denotes a stopper, and the reel drive claw 11 is always held in a state of being in contact with the stopper 13.

Next, with reference to FIG. 6, a description will be given of the case where the tape cassette 1 is mounted on the cassette automatic mounting device 21 provided with the reel stand 10. First, when the tape cassette 1 is horizontally inserted from the cassette insertion opening of the cassette mounting device 21, the tape cassette 1 is automatically further pulled in the horizontal direction to store the tape cassette 1 in the device 21.

At this time, the lower surface of the tape cassette 1 passes above the reel stand 10. Then, the tape cassette 1 is moved in the vertical direction, so that the reels 5 in the tape cassette 1 are mounted on the reel base 10. FIG. 7 is a sectional view of the reel 5 mounted on the reel base 10. As shown in FIG. 7, the reference protrusion 5e and the protrusion 5f of the reel 5 come into contact with the reel receiving portion 10b of the reel stand body 10a. As a result, the running height of the tape 4 wound around the reel 5 is restricted. Then, the rotation center of the reel 5 is positioned by fitting the fitting portion 5h of the reel 5 and the reel fitting portion 10c of the reel stand body 10. Also, reel stand 1
The reel driving claw 11 of 0 is transmitted with the rotational force by engaging with the protrusion 5f provided on the reference protrusion 5e of the reel 5.

At this time, it is not the reel claw engaging projection 5g that transmits the rotational force to the reel 5 but the reel 5 as described above.
The projection 5f formed on the lower part of the above is used. As a result, it is not necessary to insert the reel stand 10 deep inside the drum 5b of the reel 5, and the height C of the reel stand 10 is sufficiently shorter than the height H of the reel stand 16 of the conventional example.
(C <H) And the height C of the reel stand 10 is the device 2
The thickness of the device body can be reduced by affecting the thickness D of No. 1 (D
A large effect <I) occurs.

Needless to say, the reel of the present invention is effective not only for the tape cassette housed in the cassette half but also for an open reel type reel.

[0026]

As described above, according to the reel of the present invention, the reference protrusion which regulates the height direction of tape running is formed below the drum portion, and the protrusion extending toward the center of the drum is used as the reference protrusion. Since it is provided inside the protrusion, the contact area with the reel stand on the device side becomes large, and as a result, the mountability between the reel and the reel stand can be stabilized.

Further, since the reference protrusion and the protrusion are formed on the lower portion of the reel, the rotational force is transmitted to the reel by engaging the reel drive claw of the reel stand with the protrusion of the reel, and the mounting stroke is increased. This has the great effect of shortening the thickness of the main body of the apparatus.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a tape cassette containing a reel according to an embodiment of the present invention.

FIG. 2 is a sectional view of the reel.

[Fig. 3] Bottom view of the reel

FIG. 4 is a cross-sectional view of main parts when the reel is mounted on a reel stand on the device side.

FIG. 5 is a sectional view of the reel stand.

FIG. 6 is an internal structure diagram of the automatic cassette loading device.

FIG. 7 is a cross-sectional view of essential parts when a reel according to an embodiment of the present invention is mounted on a reel stand on the apparatus side.

FIG. 8 is a sectional view of a conventional reel.

FIG. 9 is a sectional view of the reel stand.

FIG. 10 is a cross-sectional view of essential parts when a conventional reel is mounted on a reel stand on the apparatus side.

FIG. 11 is an internal structure diagram of the automatic cassette loading device.

[Explanation of symbols]

 5b Drum 5c Lower flange 5e Reference projection 5f Projection 5g Reel claw engagement projection 5h Fitting part

Claims (1)

[Claims] 1. A cylindrical drum portion around which a tape is wound, and a reference protrusion for hitting a reel stand on the apparatus side to regulate the height direction of tape running are formed below the drum portion, and the drum is also provided. A reel characterized in that a protrusion extending toward the center of the portion is provided inside the reference protrusion.