JPH08241580A - Tape reel - Google Patents

Abstract

PURPOSE: To increase impact strength when a tape reel falls and to hardly make an upper flange be damaged by engaging pawls with stoppers respectively provided on the upper flange and a reel hub and connecting the upper flange with the reel hub. CONSTITUTION: The pawls 22 are provided on the upper flange 11 forming the reel, and the stoppers 19 are provided on an inner hub 15 inside of the outer hub 14 of the reel hub 13. The stoppers 19 are engaged with the pawls 22, and the flange 11 is connected with the hub 13, and the impact strength when the tape reel falls is increased, and the upper flange is hardly made be damaged. Further, by such a constitution, the necessity that the upper flange is welded with the reel hub is eliminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape reel,
More specifically, the present invention relates to a structure for connecting an upper flange and a reel hub in a tape reel manufacturing process.

[0002]

2. Description of the Related Art The structure of a conventional tape reel will be described below. A video cassette used in an electronic device such as a video tape recorder has a structure in which two tape reels connected by one magnetic tape are mounted and housed, and one tape reel winds the magnetic tape. The other tape reel is configured to rewind this magnetic tape when it is being used.

As shown in FIG. 6, each tape reel has a disc-shaped upper flange 1, a lower flange 2 having the same diameter as the upper flange 1, and a reel hub 3.

A tape locking structure 4 is formed at one location on the outer peripheral surface of the reel hub 3, and the leading end of the leader tape 5 is sandwiched so as not to come off easily.

The rear end of the leader tape 5 is connected to the magnetic tape 7 by a slicing tape 6. The magnetic tape 7 having a predetermined length is wound around the reel hub 3 with its both edges restricted by the upper flange 1 and the lower flange 2.

In the process of manufacturing a tape reel, generally, the lower flange 2 and the reel hub 3 are integrally formed of a wear-resistant synthetic resin material (generally white and opaque), and the lower surface of the lower flange 2 is As shown in FIG. 7, it has a structure in which an uneven reel locking member is provided on the circumferential edge.

As shown in FIG. 8, the upper flange 1 is made of a transparent resin material different from that of the lower flange 2 and the reel hub 3 without considering the strength.

Conventionally, the integrally formed parts of the lower flange 2 and the reel hub 3 and the upper flange 1 have been joined as follows.

On the reel hub 3, as shown in FIGS. 9 and 10, six pins 8 are vertically provided from the lower flange 2. On the other hand, the upper flange 1 is provided with six pin holes 3b at positions corresponding to the six pins 8 of the lower flange 2. In this case, as shown in FIG. 10, the peripheral portion C of the hole 3b of the upper flange 1 is stepped so as to be lower than the outside.
This is because when the upper flange 1 is connected to the reel hub 3,
This is because the head of the pin 8 and the upper surface of the upper flange 1 are substantially flush with each other when the pin 8 is welded.

To fix the upper flange 1 to the reel hub 3, the upper ends of the pins 8 of the reel hub 3 are passed through the corresponding holes 3b of the upper flange 1, and then the heads of the pins 8 are ultrasonically welded. It is melted and welded to the upper flange 1. As a result, the upper flange 1 is fixed to the reel hub 3.

[0011]

However, in the conventional tape reel having the above-mentioned coupling structure, the upper flange 1 is made of a hard and less flexible material. In addition, since the area of the C portion of the upper flange 1 allowed for one pin 8 is extremely small, the space between adjacent pins is also small, and the diameter of the pin 8 is small. The impact strength and the strength of the pin 8 itself are not great.

Further, it is conceivable that the material of the upper flange 1 is made to have a high impact resistance and the thickness thereof is made thick and the diameter of the pin 8 is made thick. However, the structure of the C portion is unreasonable. This causes an increase in cost.

Therefore, for the purpose of providing a tape reel which is resistant to an impact such as dropping, there is a problem in the connecting structure of the upper flange of the tape reel and the reel hub.

[0014]

In order to solve the above-mentioned problems, a tape reel according to the present invention comprises a plurality of claws which are integrally formed upright on the lower surface of an upper flange and have a hook-like shape whose lower end faces inward. , A coupling structure formed on the outer peripheral surface of the inner ring of the reel hub and including a stopper that engages with a claw of the upper flange.

[0015]

With the above structure, the claw extending downward from the lower surface of the upper flange is engaged with the stopper formed on the outer peripheral surface of the inner ring of the reel hub to lock the upward movement of the claw. As a result, the upper flange is fixed to the reel hub.

Further, when the upper flange is fixed to the reel hub, the hook-shaped tip of the claw comes into contact with the outer peripheral surface of the inner ring of the reel hub, and the base of the claw comes into contact with the inner peripheral surface of the outer ring of the reel hub. The entire claw is restricted from moving outward in the diametrical direction. Further, the movement of the pawl in the circumferential direction is restricted by the base of the pawl being in contact with the radial rib of the reel hub.

[0017]

Embodiments of the tape reel according to the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 3, the tape reel according to the present embodiment is a tape reel for a cassette, and includes a disc-shaped upper flange 11 and a lower flange 12, and a space between the upper flange 11 and the lower flange 12. The reel hub 13 has a cylindrical shape and is sandwiched between them.

The lower flange 12 and the reel hub 13 are integrally molded, and the upper flange 11 is connected to the cylindrical upper surface which is the free end of the reel hub 13 by the connecting structure according to the present invention described below. Has become.

As shown in FIGS. 1 and 2, the reel hub 13 is a ring-shaped outer hub 14 around which a magnetic tape is wound.
An inner hub 15 forming a concentric circle inside the outer hub 14, a plurality of ribs 16 radially connecting and connecting the outer hub 14 and the inner hub 15, and a height direction of an inner wall of the inner hub 15. It has a bowl-shaped shaft center portion 17 integrally formed in the center and formed so that the center portion rises upward.

The outer hub 14 is integrally formed with the lower flange 12, and the inner hub 15 is connected to the outer hub 14 by ribs 16. The height of the inner hub 15 is slightly lower than the height of the outer hub 14.

A clamper fitting hole 18 having a tape clamp structure is formed at one location on the outer peripheral surface of the reel hub 13. Since the tape clamp structure is not related to the present invention, further explanation is omitted.

The structure for connecting the upper flange 11 and the reel hub 13 according to the present invention will be described below.

(1) Structure of Reel Hub Side As shown in FIG. 1, the space between the outer hub 14 and the inner hub 15 of the reel hub 13 is divided into six spaces by six ribs 16. A clamper fitting hole 18 is provided in one of the six spaces.

The inner hub 15 is provided on the outer peripheral surface of the inner hub 15 at the center of each of the three spaces, that is, the two spaces on both sides of the clamper fitting hole 18 and the space opposite the clamper fitting hole 18. A stopper 19 having the same curvature as the outer peripheral surface of is formed integrally.

As shown in FIG. 2, the stopper 19 is provided at a position higher than the edge of the disc of the shaft center portion 17, and its shape is linearly rising downward from the opening by a predetermined distance. It has a so-called wedge shape, which has a lower end and falls perpendicularly to the outer peripheral surface of the inner hub 15.

The length of the stopper 19 in the circumferential direction is
The width is substantially equal to the width of the claw 20 of the upper flange 11 described later.

(2) Structure on the Upper Flange Side The upper flange 11 has a reel hub 1 as shown in FIG.
Three engaging portions 20 of the same shape are integrally formed at positions corresponding to the above three stoppers 3 of 3, respectively.

As shown in FIGS. 3 and 4, the engaging portion 20 is a handle portion 21 which stands upright from the lower surface of the upper flange 11.
And a hook-shaped claw 22 provided at the tip of the handle portion 21,
In the base portion of the handle portion 21 (the root portion integrally formed with the upper flange 11), the back surface fixing ribs 23 projecting radially outward of the handle portion 21 and the side surface fixing ribs 24 projecting on both sides in the circumferential direction of the handle portion 21. Consists of.

As shown by hatching in FIG. 3, the handle portion 21 of the engaging portion 20 has a circle (dotted line A) corresponding to the outer peripheral surface of the inner hub 15 of the reel hub 13 on the lower surface of the upper flange 11.
, And a circle corresponding to the inner peripheral surface of the outer hub 14 (dotted line B
And a straight line (dotted line C) corresponding to the two ribs 16
1 and C2) is a partial ring-shaped member that stands downward from the central portion of the area surrounded by (1 and C2), and any of the outer hub 14, the inner hub 15, and the two ribs 16 that surrounds this area. Although not in contact with each other, it receives the vertical stress that couples the upper flange 11 and the reel hub 13 together.

The handle portion 21 has the same curvature as the outer peripheral surface of the inner hub 15, and its thickness in the diametrical direction is determined by the distance W between the outer hub 14 and the inner hub 15 and the thickness of the back fixing rib 23. Nail 2
It is smaller by the sum of the two protrusions. Further, the width of the handle portion 21 in the circumferential direction is made smaller than the distance between the two adjacent ribs 16 (between C1 and C2) by the sum of the protruding lengths of the side surface fixing ribs 24 on both sides. If necessary, the side fixing ribs 24 may be made smaller and the circumferential width of the handle 21 may be made larger to increase its strength.

The claw 22 of the engaging portion 20 is a hook-shaped member which is provided at the lower end of the handle 21 in the opposite direction to the stopper 19 in the vertical and horizontal directions. The inner tip of the claw 22 has a circle A
It comes in contact with.

The rear surface fixing rib 23 is integrally formed with the handle portion 21 and the upper flange 11 on the outside of the base portion of the handle portion 21 in the diametrical direction, and its diametrical length is such that the outer peripheral surface coincides with the circle B. The length in the circumferential direction is equal to the width of the handle portion 21, and the length in the up-down direction is sufficient to reinforce the base portion of the handle portion 21.

That is, when the upper flange 11 is connected to the reel hub 13, the outer peripheral surface of the rear fixing rib 23 contacts the inner peripheral surface of the outer hub 14, thereby restricting the diametrical position of the handle portion 21. At the same time, it has a function of reinforcing the strength of the base portion of the handle portion 21.

The side surface fixing ribs 24 are integrally formed on both sides in the circumferential direction of the base of the handle portion 21, and the length in the circumferential direction including the handle portion 21 and the side surface fixing ribs 24 on both sides is equal to that of the two ribs 16. The intervals are almost equal. The vertical length of the side surface fixing ribs 24 is substantially equal to that of the back surface fixing ribs 23.

That is, the upper flange 11 is connected to the reel hub 13
When combined with each other, the end faces of the side surface fixing ribs 24 on both sides of the handle 21 are in contact with the ribs 16 to restrict the circumferential position of the handle 21 and to reinforce the strength of the base of the handle 21. Have.

(3) Assembly Two parts, the part in which the lower flange 12 and the reel hub 13 are integrally molded, and the upper flange 11 having the above-mentioned structure are joined as follows to complete a tape reel. .

The positions of the three engaging portions 20 of the upper flange portion 11 are aligned with the positions of the three stoppers 19 of the reel hub 13, and the engaging portions 20 are provided between the outer hub 14 and the inner hub 15 of the reel hub 13. Push in from.

The upper flange 11 drops without any resistance until the claw 22 of the engaging portion 20 hits the stopper 19.
When the claw 22 is tilted by the stopper 19, it is necessary to apply a force from above.

Since the handle portion 21 of the engaging portion 20 has elasticity, by applying a force from above, the claw 22 spreads outward as it descends along the inclined surface of the stopper 19. When the pawl 22 goes over the lower end of the stopper 19, the handle 21
Elastically restores, resulting in pawl 22 and stopper 19
It engages with the lower end of the engaging part 20, and the engaging part 20 cannot move upward.

At this time, as shown in FIG. 5, the upper flange 1
The lower surface of 1 is in contact with the upper end surface of the outer hub 14, the outer peripheral surface of the rear surface fixing rib 23 of the engaging portion 20 is in contact with the inner peripheral surface of the outer hub 14,
Although not shown, the side surface fixing rib 24 is in contact with the rib 16, so that the upper flange 11 is fixed to the reel hub 13.

In the above embodiment, the engaging portion 20 of the upper flange 11 and the stopper 19 of the reel hub 13 are provided at three places, but the number is not limited to the number of the ribs 16 of the reel hub 13.

Further, in the above embodiment, the back face fixing ribs 23 and the side face fixing ribs 24 are separate blocks, but they may be integrally formed on the handle 21 and the upper flange 11 as a single block.

[0043]

As described above, in the tape reel according to the present invention, the impact strength when the tape reel is dropped is improved and the upper flange is less likely to be damaged.

Further, when the upper flange and the reel hub are joined together, there is no need for welding, so welding equipment is not required.

[Brief description of drawings]

FIG. 1 is a top view of a lower flange and a reel hub of an embodiment of a tape reel according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a bottom view of the upper flange of the embodiment.

FIG. 4 is a sectional view taken along line BB of FIG.

FIG. 5 is a cross-sectional view of the tape reel of the embodiment after assembly.

FIG. 6 is a perspective view showing a conventional tape reel.

FIG. 7 is a bottom view of a prior art tape reel.

FIG. 8 is a top view of the tape reel.

FIG. 9 is a side view of the tape reel.

FIG. 10 is an enlarged view of a portion of FIG. 9H.

[Explanation of symbols]

 11 Upper Flange 12 Lower Flange 13 Reel Hub 14 Outer Hub 15 Inner Hub 16 Rib 17 Shaft Center Part 18 Clamper Fitting Hole 19 Stopper 20 Engaging Part Claw 21 Handle 22 Claw 23 Rear Fixing Rib 24 Side Fixing Rib

Claims (3)

[Claims] 1. A reel hub having a cylindrical shape and comprising a plurality of ribs radially arranged between an inner hub and an outer hub having different diameters, and a disc shape integrally formed on the lower surface side of the reel hub. A tape reel comprising a lower flange and an upper flange connected to the upper surface side of the reel hub, wherein a plurality of the tape reels are integrally formed upright on the same circumference on the side connected to the reel hub. And an engaging portion having an inward hook-shaped claw is provided at the erected tip, and the reel hub is provided with a predetermined distance from an opening on the upper surface side that is coupled to the upper flange. A tape reel characterized in that a stopper for engaging with the claw is provided on the outer peripheral surface. 2. The engaging portion includes the claw that contacts the outer peripheral surface of the inner hub of the reel hub, and the base portion that contacts the inner peripheral surface of the outer hub of the reel hub.
Tape reel described in. 3. The tape reel according to claim 2, wherein the base portion is in contact with a plurality of radially arranged ribs of the reel hub.