JPH1064232A - Tape cassette reel - Google Patents

Abstract

(57) [Summary] [Problem] Regardless of the amount of tape winding, the outer peripheral surface of a tape winding hub can be held in a cylindrical shape without taper, thereby reliably preventing tape deformation and disturbing video images. Provided is a tape cassette reel that can eliminate the problem. SOLUTION: An inner cylindrical portion 18 is provided at a center portion of a disk-shaped flange 11 and has a base end portion 12a opened and a distal end portion 12b closed, and is disposed concentrically outside the inner cylindrical portion 18. A plurality of ribs 2 spaced circumferentially
A first reel member having a double-layered tape winding hub 12 of an outer cylindrical portion 19 connected through
And a second reel member having a center portion of the flange 13 disposed opposite to the first portion connected to the distal end portion 12b of the inner cylindrical portion 18 of the tape winding hub 12.
A pair of adjacent ribs 2 between the heavy inner and outer cylindrical portions 18 and 19;
A plurality of strength adjusting holes 23 are formed in the flange 11 of the first reel member at a position facing the gap between 0 and at intervals in the circumferential direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette reel provided inside a video tape cassette or the like for accommodating a recording tape used for a video deck or the like, for winding and holding a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, as conceptually shown in FIG. 3, for example, a tape cassette reel 50 used for winding a recording tape used for a video deck or the like has a lower flange 51 made of a disc and a lower flange 51 made of a disc. A tape winding hub 52 having a cylindrical shape at the center and having an open lower end and a closed upper end; and a tape winding hub 52 disposed above and opposed to the lower flange 51. And an upper flange 54 connected to the upper end of the base via a connecting rib 53.

[0003] Such a conventional tape cassette reel 5
0, as shown in FIG.
The rotation supporting shaft 55 provided on the tape winding hub 52 is fitted into the inner concave portion of the tape winding hub 52, and the tape winding hub 52 is rotated around the rotation supporting shaft 55, as shown in FIG. The tape 56 will be wound around the winding hub 52.

However, as shown in FIG. 4, the tape winding hub 52 has a base end 52a substantially formed integrally and continuously with the lower flange 51, while a tip end 52b has a lid 5 formed.
Since the area of the lower flange 51 is much larger than that of the lid 52c just by being closed by 2c, the tape winding hub 52 has a distal end 52b with a radially inward portion as compared with the base end 52a. (Strength against external force in the direction toward the center).

Therefore, as shown in FIGS. 5 and 6, regardless of the amount of the tape 56 wound around the tape winding hub 52, when the tape 56 is wound around the tape winding hub 52, the tape winding hub A winding tightening force is applied to the tape 52 from the radially outward direction toward the radially inward direction (toward the center of the lid 52c). Then, the tip 52b of the tape winding hub 52 is closed by the lid 52 by this winding tightening force.
The tape winding hub 52 is deformed so as to decrease in diameter together with the tape c, and a tapered surface whose diameter gradually decreases from the base end portion 52a toward the front end portion 52b is formed on the outer peripheral surface.

In particular, when the tape winding amount is large as shown in FIG. 5, the contraction of the tip 52b and the lid 52c of the tape winding hub 52 increases, and the slope of the taper surface of the tape winding hub 52 becomes smaller. growing. When the tape 56 is wound around such a tapered surface, an excessive force is applied to one side in the width direction of the tape 56, for example, a waveform distortion occurs in the length direction, and uniform contact with the magnetic head is smoothly performed. And the video image is disturbed, and the durability of the tape 56 is impaired.

In order to prevent a tapered surface from being formed on the outer peripheral surface of the tape winding hub 52 due to the winding of the tape 56, as shown in FIG. The diameter of the proximal end 60a is
There has been proposed a tape cassette reel 63 that is smaller (smaller) than the diameter 0b and has an inverted taper shape as compared with the related art.

According to such a tape cassette reel 63, as shown in FIG. 8, the tape 56 is wound around the tape winding hub 60, and the tape 56 is wound around the tape winding hub 60.
As a result, the diameter of the distal end portion 60b of the tape winding hub 60 shrinks, and as a result, the outer peripheral surface of the tape winding hub 60 becomes a cylindrical shape without taper. Accordingly, it is possible to prevent the waveform from being distorted due to excessive force applied to one side in the width direction of the tape 56, and to prevent the video image from being disturbed.

[0009]

However, in the case of the tape cassette reel 63 shown in FIG. 7, when the tape winding amount is large as shown in FIG. 8, the outer peripheral surface of the tape winding hub 60 has a cylindrical shape without taper. When the tape winding amount is small or medium, the tape winding hub 60
Since the outer peripheral surface of the tape 56 maintains an inverted tapered shape, the tape 56
Again deforms, causing video images to be distorted.

In view of such a problem, the present invention can hold the outer peripheral surface of the tape winding hub in a cylindrical shape without taper, regardless of the amount of tape winding, and reliably prevent tape deformation. It is another object of the present invention to provide a tape cassette reel capable of eliminating video image disturbance.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an inner cylindrical portion provided at the center of a disk-shaped flange, having a base end opened and a tip closed. A first reel member having a double-layered tape winding hub of an outer cylindrical portion which is arranged concentrically outside the inner cylindrical portion and connected via a plurality of circumferentially spaced ribs; And a second reel member having a center portion of the flange disposed opposite to the flange connected to a distal end portion of the inner cylindrical portion of the tape winding hub. A plurality of strength adjusting holes are formed in the flange of the first reel member at positions opposed to the gap between the pair of adjacent ribs between the cylindrical portions and at intervals in the circumferential direction. The configuration is as follows.

According to the tape cassette reel having such a configuration, a position between the double inner and outer cylindrical portions of the tape winding hub is opposed to a gap between the pair of adjacent ribs, and is in the circumferential direction. By forming a plurality of strength adjusting holes in the flange of the first reel member at intervals, it is possible to make the radial strength of the base end portion and the tip end portion of the tape winding hub substantially equal. . For this reason, even when the tape is wound around the tape winding hub and an external force is applied to the tape winding hub in a radially inward direction, the tape extends radially from the base end to the entire length of the tip end of the tape winding hub. Since a uniform internal stress is generated, the tape winding hub can maintain a tapered cylindrical shape regardless of the tape winding amount. Therefore, it is possible to prevent the winding tape from being deformed, and it is possible to reliably prevent the video image from being distorted due to the deformation of the tape.

[0013]

Embodiments of the present invention will be specifically described below with reference to the embodiments shown in the accompanying drawings. FIG. 1 and FIG. 2 are views showing a main part of the tape cassette reel according to the first embodiment of the present invention. As shown in FIGS. 1 and 2, the tape cassette reel 10 has basically the same configuration as the conventional tape cassette reel 50 conceptually described above.

That is, as shown in FIG. 1A and FIG.
A lower flange 11 made of a disk as a first reel member
A tape winding hub 12 having a substantially cylindrical shape and having a lower end opened and an upper end closed by a lid 21 is formed at the center of the tape winding hub 12. Above the tape winding hub 12 in the drawing,
As a second reel member, an upper flange 13 having the same size as that of the lower flange 11 is arranged to be opposed, and a central portion thereof is provided with a lid portion 21 at the front end of the tape winding hub 12 via a connecting member 14. Is connected to the periphery.

Further, the inner side recess 12 of the tape winding hub 12 is formed.
c, the rotary support shaft 1 provided in the cassette case 15
6, the tape winding hub 12 is rotated by the rotation support shaft 16 through the engagement between the groove (not shown) of the rotation support shaft 16 and the locking claw 18a. The tape 17 is wound around the outer peripheral surface of the attached hub 12.

In this embodiment, as shown in FIGS. 1 (a) and 2, the tape winding hub 12 has concentrically formed double cylindrical portions 18 and 19 concentrically. That is, the tape winding hub 12 is formed by an inner cylindrical portion 18 and an outer cylindrical portion 19 integrally connected by twelve longitudinal ribs 20 provided at equal intervals in a circumferential direction, The tape 17 is wound around the outer peripheral surface of the outer cylindrical portion 19.

Further, in the present embodiment, in the tape cassette reel 10 having the above-described configuration, the radial strength of the proximal end portion 12a and the distal end portion 12b of the tape winding hub 12 formed of a cylindrical body is substantially equalized. The tape winding hub 12 is configured to surely prevent deformation of the outer peripheral surface.

That is, in the present embodiment, as shown by oblique lines at respective locations in FIG. 1A, between the inner cylindrical portion 18 and the outer cylindrical portion 19 and between the pair of adjacent vertical ribs 20. Six arc-shaped strength adjusting holes 2 are formed in the lower flange 11 at positions opposed to the gap to be defined, at equal intervals in the circumferential direction.
3 are formed.

By the way, among the six positions of the strength adjusting holes 23 indicated by oblique lines in FIG. 1A, the position indicated by the reference numeral B is located at the end of the tape 17 as shown in FIG. Part 17
A clamp mechanism 25 for fixing a is provided. That is, a strength adjusting hole 23 is provided at the position of the lower flange 11 facing the clamp mechanism 25, and six strength adjusting holes are provided at equal intervals in the circumferential direction based on the position of the strength adjusting hole 23. Hole 23 is lower flange 1
1 is formed.

The plurality of strength adjusting holes 23 reduce the radial strength of the proximal end 12a of the outer cylindrical portion 19 of the tape winding hub 12 formed integrally and continuously with the lower flange 11. The strength can be reduced as compared with the case where the adjustment hole 23 is not formed, and can be made substantially equal to the radial strength of the distal end portion 12 b of the outer cylindrical portion 19.

Accordingly, the tape winding hub 12 rotates around the rotation support shaft 16, and the tape 17 is moved to the tape winding hub 12.
Of the tape 56 toward the inside of the radius of the tape winding hub 12.
Even when the outer cylindrical portion 19 is generated, the outer cylindrical portion 19 has a radially uniform internal stress at the base end portion 12a and the distal end portion 12b. A cylindrical shape without taper can be maintained regardless of the winding amount. As a result, it is possible to prevent the wound tape 17 from being deformed, and it is possible to reliably prevent the video image from being distorted due to the deformation of the tape 17.

In the above embodiment, the strength adjusting hole 23 is provided between the inner cylindrical portion 18 and the outer cylindrical portion 19 of the tape winding hub 12 of the lower flange 11 so as to be adjacent to the pair of twelve vertical ribs 20. Clamp mechanism 2 every other between fittings
5 are formed at six locations in the circumferential direction with reference to the position of the strength adjusting hole 23 facing the base 5. However, when the winding tightening force P is not strong, the strength adjusting hole 23 is formed in the circle of the lower flange 11. It may be formed at a total of three places in every two gaps between the twelve longitudinal ribs 20 in the circumferential direction.

Alternatively, by increasing or decreasing the number of the vertical ribs 20, the number of the strength adjusting holes 23 may be formed in accordance with the strength of the winding tightening force P. Further, the strength adjusting holes 23
Instead of the number, the length may be adjusted to correspond to the winding tightening force P.

[0024]

As described above, according to the present invention, between the double inner and outer cylindrical portions of the tape winding hub, at the position facing the gap between the pair of adjacent ribs, and at the circumferential position. By forming a plurality of strength adjusting holes in the flange of the first reel member at intervals in the direction, it is possible to make the radial strength of the base end portion and the tip end portion of the tape winding hub substantially equal. it can.

For this reason, even when the tape is wound around the tape winding hub and an external force is applied to the tape winding hub in a radially inward direction, the tape extends from the base end to the entire length of the tip end of the tape winding hub. Since a uniform internal stress is generated in the radial direction, the tape winding hub can maintain a tapered cylindrical shape regardless of the tape winding amount. Therefore, it is possible to prevent the winding tape from being deformed, and it is possible to reliably prevent the video image from being distorted due to the deformation of the tape.

According to the tape cassette reel of the present invention, the conventional tape cassette reel 6 shown in FIG.
The productivity of the tape cassette reel can be improved as compared with the case where the tape winding hub 60 is formed in a reverse taper in advance as shown in FIG.

[Brief description of the drawings]

FIG. 1 is a view showing a tape cassette reel 10 according to a first embodiment of the present invention. FIG. 1A shows a lower flange 11 and a tape winding hub 12 of the tape cassette reel 10.
FIG. 1B is a plan view of a first reel member made of
It is a detailed enlarged view of the tape winding hub 12 of the B section in (a).

FIG. 2 is a sectional side view of the lower flange 11 and the tape winding hub 12 taken along line II of FIG. 1A.

FIG. 3 is a conceptual cross-sectional side view of a conventional tape cassette reel 50.

FIG. 4 shows a lower flange 51 and a tape winding hub 52 of FIG.
FIG.

FIG. 5 is a sectional side view of the lower flange 51 and the tape winding hub 52 when the tape winding amount is large.

FIG. 6 is a cross-sectional side view of the lower flange 51 and the tape winding hub 52 when the tape winding amount is small.

FIG. 7 is a conceptual cross-sectional side view of another conventional tape cassette reel 63.

FIG. 8 is a sectional side view of the tape cassette reel 63 when a tape winding amount is large.

[Explanation of symbols]

10 tape cassette reel, 11 lower flange, 12
... tape-wrapped hub, 12a ... proximal end, 12b ... distal end,
12c: inner diameter side concave portion, 13: upper flange, 14: connecting member, 15: cassette, 16: rotating support shaft, 17: tape, 18: inner cylindrical portion, 18a: locking claw, 19: outer cylindrical portion, 20 ... Vertical ribs, 23: Strength adjustment holes, 25: Clamp mechanism

Claims (1)

[Claims] Claims: 1. A disk-shaped flange is provided at the center of a disk-shaped flange,
An inner cylindrical portion whose base end is open and whose distal end is closed, and an outer cylindrical portion which is concentrically arranged outside the inner cylindrical portion and connected via a plurality of ribs arranged at intervals in the circumferential direction. A first reel member having a tape winding hub having a double structure of a cylindrical portion, and a center portion of the flange disposed opposite to the flange is connected to a tip end of an inner cylindrical portion of the tape winding hub. A second reel member, and a tape cassette reel comprising: a space between the double inner and outer cylindrical portions facing a gap between a pair of adjacent ribs; A tape cassette reel, wherein a plurality of strength adjusting holes are formed in a flange of the first reel member.