JPH09231718A - Tape reel and its molding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a tape reel in which the face accuracy of a flange receiver face at a hub body part is enhanced and in which the face deflection of a reel flange can be eliminated effectively. SOLUTION: The tape reel is constituted of a hub body part 1 comprising a winding shaft face 2 on which a magnetic tape is wound and of reel flanges 6, 7 which are screwed and fixed to a plurality of tapped holes formed in a plurality of flange receiver faces 10 of the hub body part 1. In this case, the tapped holes 11 and the plurality of flange receiver faces 10 whose circumferential parts protrude to be island-shaped and which are finished to face accuracy are molded on upper and lower outer circumferential faces of the hub body part 1, and the reel flanges 6, 7 are screwed and fixed to the flange receiver faces 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape reel suitable for use as, for example, an open reel around which a magnetic tape as an information recording medium is wound.

[0002]

2. Description of the Related Art Conventionally, an example of the structure of this type of open reel will be described with reference to FIGS. Reference numeral 1 denotes a hub main body made of a plastic molded product having a winding shaft surface 2 around which a magnetic tape is wound, and the hub main body 1 is rotatively driven by engaging the hub main body 1 with a drive shaft of a reel stand (not shown). It has holes 3. The upper and lower outer peripheral surfaces of the hub body 1 are flange receiving surfaces 4 of a reel flange described later, and the flange receiving surface 4 is formed with a plurality of screw holes 5 at equal intervals.

On the other hand, the reel flanges 6 and 7 fixed to the upper and lower flange receiving surfaces 4 are made of aluminum press-molded products, and these reel flanges 6 and 7 are flange-received through preformed holes 6a and 7a. A countersunk screw 8 is screwed into and fixed to the screw hole 5 of the surface 4.

[0004]

In the tape reel constructed as described above, a magnetic tape (not shown) is wound around the winding shaft surface 2 in FIG. 5, but the magnetic tape depends on the attitude of the reel flange. , Usually one side (down)
The tape edge often comes into contact with the reel flange 7 and is wound. For this reason, the surface runout of the reel flange 7 (waviness of the flange) damages the tape edge. Therefore, it is necessary to minimize the surface runout of the reel flange. There is.

However, since the hub body 1 is made of a plastic molded product, the surface accuracy of the flange receiving surface 4 in the circumferential direction is not so high. Therefore, when the reel flanges 6 and 7 are screwed and fixed to the flange receiving surface 4,
According to the surface accuracy of the flange receiving surface 4, the reel flange 6,
As a result, the reel flanges 6 and 7 are circumferentially wobbled as shown in FIG. 6, and the tape edge of the magnetic tape 9 is formed at this wobbling portion. 9a comes into contact with each other to cause damage, which causes deterioration of the recording / reproducing characteristics of the magnetic tape.

The present invention has been made to solve the above-mentioned problems, and can improve the surface accuracy of the flange receiving surface of the hub body to effectively eliminate the surface runout of the reel flange. And its molding method.

[0007]

To achieve the above object, a tape reel according to the present invention has a hub body having a winding shaft surface around which a magnetic tape as an information recording medium is wound, and a hub body of the hub body. In a tape reel composed of a reel flange screwed to a plurality of screw holes formed on the flange receiving surface, the screw holes and their peripheral portions are formed as island-shaped protruding flange receiving surfaces with a finished surface accuracy. The reel flange is screwed to the flange receiving surface.

With this structure, the reel flange is screw-fixed to the flange-shaped receiving surface that is finished in surface accuracy and protrudes in an island shape. Therefore, surface runout of the reel flange is eliminated and damage to the tape edge can be avoided. .

Further, a hub body having a winding shaft surface around which a magnetic tape as an information recording medium is wound, and a reel flange screwed into a plurality of screw holes formed in a flange receiving surface of the hub body. In the method for forming a tape reel, the screw hole and its peripheral portion are formed into a plurality of island-shaped protruding surface-accuracy flange receiving surfaces. This is made possible by adjusting the height of the insert that molds each flange receiving surface during molding by a mold.

By such a molding method, the surface accuracy of the flange receiving surface of the first molded product can be confirmed, and the surface accuracy of the subsequent flange receiving surface can be improved by adjusting the height of the insert.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a tape reel and a molding method thereof according to the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a hub body and a reel flange, and FIG. 2 is a cross-sectional view of a tape reel in an assembled state. The same parts as those of the conventional tape reel described in FIGS. 4 and 5 are shown. Will be described with the same reference numerals.

The hub body 1 has a winding shaft surface 2 around which a magnetic tape is wound, and is made of a plastic molded product. At the center of the hub body 1, there is a hub hole 3 which is driven and rotated by engaging a drive shaft of a reel stand (not shown). On the upper and lower outer peripheral surfaces of the hub body 1, a plurality of flange receiving surfaces 10 which are projected in an island shape and have a surface finish are formed at equal intervals, and a screw hole 11 is formed at the center of each flange receiving surface 10. ing.

On the other hand, the reel flanges 6 and 7 are made of aluminum press-molded products, and the reel flanges 6 and 7 are superposed on the flange receiving surface 10 and are formed through preformed holes 6a and 7a. The countersunk screw 8 is screwed and fixed in the screw hole 11 of the surface 10.

As described above, in the hub body 1, the flange receiving surface 10 is projected in an island shape, and the height accuracy as well as the surface accuracy of each flange receiving surface 10 is improved.
No surface wobbling in the circumferential direction occurs on the reel flanges 6 and 7 which are screwed to each other. Therefore, damage to the tape edge of the magnetic tape due to surface runout of the reel flange as in the related art can be avoided.

Next, an example of a molding method for obtaining the surface accuracy of the flange receiving surface 10 will be described with reference to the molding die shown in FIG.

FIG. 3 shows a mold for forming the hub body 1, which includes a fixed upper mold 12 and a movable lower mold 1.
3, and a nest 1 capable of moving in and out for molding the flange receiving surface 10 incorporated in the molds 12 and 13, respectively.
And 4. Each insert 14 has a pin 15 for opening a screw hole 11 at the center of the flange receiving surface 10.
Are provided integrally. Reference numeral 16 is an injection port for injecting the molten resin into the molds 12 and 13, and 17 is a push-out pin for extracting the molded hub body 1 when the mold is released.

In forming the flange receiving surface 10, first, the hub body 1 is formed, and the surface accuracy of the flange receiving surface 10 at this time is measured and confirmed. After that, prior to the forming process of the hub body 1, the insert 14 that needs to be adjusted according to the surface accuracy of the flange receiving surface 10 is put in and out to adjust the flange receiving surface 10 with high surface accuracy. .

The present invention is not limited to the embodiment described above and shown in the drawings, and various modifications can be made without departing from the scope of the invention.

The tape reel of the embodiment has been described by taking the case of the open reel as an example, but other than the open reel, it can be widely applied to cassette type tape reels as long as the reel flange is fixed to the hub body with screws. Applicable.

[0021]

As described above, the tape reel of the present invention is formed on the hub main body having the winding shaft surface around which the magnetic tape as the information recording medium is wound, and the flange receiving surface of the hub main body. In a tape reel composed of a reel flange screw-fixed to a plurality of screw holes, a plurality of flange-accepting surface-finished screw holes and their peripheral portions are formed into island shapes, and the reel is mounted on the flange-receiving surface. By fixing the flange with a screw, the reel flange screwed to the flange receiving surface does not generate surface runout in the circumferential direction, and damage to the tape edge of the magnetic tape can be avoided, and the magnetic tape It is possible to prevent deterioration of the recording / reproducing characteristics.

Also, a hub body having a winding shaft surface around which a magnetic tape as an information recording medium is wound, and a reel flange screwed into a plurality of screw holes formed in a flange receiving surface of the hub body. In the method for forming a tape reel, the screw hole and its peripheral portion are formed into a plurality of island-shaped protruding surface-accuracy flange receiving surfaces. When molding with a mold, it is possible to do by adjusting the height of the nest that molds each flange receiving surface,
A highly accurate flange receiving surface can be obtained with a simple mold structure.

[Brief description of drawings]

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

FIG. 2 is a sectional view of the tape reel of the same.

FIG. 3 is a sectional view of a molding die for molding a flange receiving surface.

FIG. 4 is an exploded perspective view of a conventional tape reel.

FIG. 5 is a sectional view of the tape reel of the same.

FIG. 6 is an explanatory diagram of damage to a magnetic tape due to surface deflection of a conventional reel flange.

[Explanation of symbols]

1 hub body part, 2 winding shaft surface, 6, 7 reel flange, 8 screw, 10 island-shaped flange receiving surface, 11 screw hole, 12 upper mold, 13 lower mold, 14 nesting, 15
pin

Claims (2)

[Claims] 1. A hub main body having a winding shaft surface around which a magnetic tape as an information recording medium is wound, and a reel flange screwed into a plurality of screw holes formed in a flange receiving surface of the hub main body. In the tape reel configured as described above, the screw hole and its peripheral portion are formed into a plurality of flange receiving surfaces that are finished in an island shape and are finished with surface accuracy, and the reel flange is screwed to the flange receiving surface. Tape reel. 2. A hub main body having a winding shaft surface around which a magnetic tape as an information recording medium is wound, and a reel flange screwed into a plurality of screw holes formed in a flange receiving surface of the hub main body. In the method for forming a tape reel, the screw hole and its peripheral portion are formed into a plurality of island-shaped protruding surface-accuracy flange receiving surfaces, and the surface accuracy finishing of the flange receiving surface is performed by the hub body portion. A method for forming a tape reel, which is performed by a height adjusting operation of a nest for forming each flange receiving surface during forming by the forming die of.