JP2003162882A - Tape reel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tape reel capable of preventing deterioration of quality and adverse effect to electronic equipment by controlling the flow direction of leaked molten resin at ultrasonic welding of an upper flange and a hub in assembly of a tape reel. <P>SOLUTION: A tape reel is made to prevent a burr such as an unnecessary burr by preparing a welding guide attached with a taper at the outer circumferential part is set at a free flange end surface of a tip of a welding horn used for ultrasonic welding, and not to make the direction of the resin leaked at the time of welding flow to the upper direction. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape reel, and more particularly to a tape reel-shaped upper flange and a hub formed integrally with a lower flange and formed in a cylindrical hub. The present invention relates to a tape reel provided with a welding guide portion that regulates the flow direction of excess welded resin.

[0002]

2. Description of the Related Art As shown in FIG. 5, a tape reel 10 includes a disc-shaped upper flange 11, a cylindrical hub 15 around which a tape is wound, and a hub 15 which is formed integrally with the hub 15 and is the same as the upper flange 11. It is composed of a disk-shaped lower flange 16 having a diameter.

The upper flange 11 has a structure in which a circular locking portion 12 having the same size as the circular shape of the hub 15 and recessed from the upper surface of the upper flange 11 is provided at the center position.

The engaging portion 12 is provided with a through hole 13 for supporting the entire tape reel 10 at the center position.
3 has a structure in which three penetrating caulking holes 14 that engage with the lower flange 16 are provided on the circumference outside by a predetermined distance from. Incidentally, the locking portion 12 has a structure in which a tape engaging portion for locking the end portion of the tape is provided, although not shown.

The hub 15 is formed integrally with the lower side formed in a cylindrical shape so as to stand upright on the lower flange 16 and has a conical projection 17 for supporting the tape reel 10 itself at the center position of the upper end surface. It has a structure in which three caulking bosses 18 formed integrally with each other are formed so as to project on the outer periphery of the protrusion 17 by a predetermined distance. The conical protrusion 17 and the caulking boss 18 have the same height.

In the assembly of the upper flange 11 and the lower flange 16 having such a structure, the engaging portion 1 of the upper flange 11 is located at the upper position of the cylindrical hub 15 which is continuously provided with the lower flange 16.
2. Engage and mount 2. That is, the caulking boss 18 penetrates the caulking hole 14 of the locking portion 12 and projects toward the upper surface of the upper flange 11, and the conical projection 17 that penetrates the through hole 13 extends toward the upper surface of the upper flange 11. It is installed in a protruding state.

As described above, the connection with the upper flange 11 mounted on the upper portion of the hub 15 is carried out by ultrasonic welding the tip portion of the caulking boss 18 protruding on the upper surface of the upper flange 11 as shown in FIG. Crush and fix by squeezing.

As shown in FIG. 6, the ultrasonic plastic welder 19 used for this ultrasonic welding has an ultrasonic wave generator 20 and a solid horn 21 for transmitting the ultrasonic wave generated by the ultrasonic wave generator 20, as shown in FIG. The welding horn 22 vibrates by the ultrasonic waves transmitted from the solid horn 21. The ultrasonic wave generator 20 includes an oscillator 23 and a vibrator 24.

The welding horn 22 is formed into an angular shape in which the cross-sectional area of the cylindrical cross section gradually decreases downward in the longitudinal direction, and the central portion of the end face of the free end of the horn is notched into a hemispherical shape. It has a structure in which a molding portion 25 formed of a convex portion protruding at a height about half the depth of the notched central position is provided.

As shown in FIG. 7, the depth W1 of the deepest portion of the molded portion 25 formed in a hemispherical shape is smaller than the depth W2 of the recessed locking portion 12 of the upper flange 11. This is a structure in which the height of the caulking boss 18 when the caulking boss 18 is crushed and caulked is housed in the recessed locking portion 12, and the upper flange 11 is provided from the upper portion of the conical protrusion 17 shown in FIG. This is for avoiding a collision, a collision or a contact with the reel pressing spring 26 that abuts and supports the reel pressing spring 26 so as to traverse the radial direction.

To weld the tip portion of the caulking boss 18 projecting on the upper surface of the engaging portion 12 of the upper flange 11 by using the ultrasonic plastic welder 19 having the welding horn 22 as shown in FIG. So that the welding horn 2
The second molded portion 25 is brought into contact with the caulking boss 18 to be welded (in the arrow direction). Then, first, caulking boss 1
The convex portion at the central position of the hemispherical notch of the welding horn 22 comes into contact with the central position of the distal end portion of 8 and the central portion of the distal end portion of the caulking boss 18 begins to melt. In this state, further attach the welding horn 22 to the upper flange direction 1 in the arrow direction.
When it is pushed to 1, it gradually melts from the central position of the tip portion of the caulking boss 18 to form a molded portion 25 and flows into the surface of the locking portion 12. In this way, the tip portion of the caulking boss 18 melted by the molding portion 25 forms a hemispherical caulking portion 18A in which the center position of the shape of the molding portion 25 is depressed to form the upper flange 11 and the hub 30. Fix it. On the other hand, the resin remaining after being melted by the molding portion 25 forms, for example, a dumpling shape in the circumferential direction of the tip of the welding horn 22 from a gap between the end faces forming the locking portion 12 and the molding portion 25 (not shown). Stick out. The direction in which the resin that protrudes is
Since the welding horn 22 is guided by the end surface of the tip of the welding horn 22 and flows in the direction along the surface of the locking portion 12, it is difficult for the upper flange 11 to flow upward, and thus falls within the depth W2 of the locking portion 12.

[0012]

[Patent Document 1] Japanese Patent Laid-Open No. 7-169231 (page 4, FIG. 3)

[0013]

However, in the welding by the welding horn 22 described in the above-mentioned prior art, when an error occurs in the descending accuracy of the welding horn 22, as shown in FIG. Cut into the surface of the locking portion 12. When the surface of the locking portion 12 is bitten, the amount of dissolution increases. That is, of the resin melted in the molding portion 25 when it digs into the surface of the locking portion 12, the resin overflowing from the molding portion 25 and the dissolved resin that digs in the molding portion 25 move upward along the side wall surface of the welding horn 22. As a result, the burr in the state of flowing and turning up becomes a burr, and the beard-shaped resin 27 extends upward in the upper flange 11 and hardens.

As shown in FIG. 9, the beard-shaped resin 27, which is formed so as to protrude from the depth W2 of the recessed locking portion 12 thus formed, is stored in the cassette 2 as shown in FIG.
In the tape reel 10 housed in the tape reel 8, the reel holding spring 26 in the form of a slender plate formed of a metal member that abuts the conical protrusion 17 at the center of rotation of the tape reel 10.
In addition, when the tape reel 10 rotates, the tape reel 10 may come into contact with, contact with, or collide with, causing the fragments to scatter, degrading the quality of the cassette 28 itself, and adversely affecting electronic devices.

Therefore, when assembling the tape reel,
There is a problem to be solved in a tape reel having a welding guide portion in which the resin overflowing from the caulking portion formed by the welding horn is regulated in the flowing direction.

[0016]

In order to solve the above problems, a tape reel according to the present invention has the following structure.

(1) A tape reel comprising a disk-shaped upper flange, a disk-shaped lower flange having substantially the same shape as the upper flange, and a cylindrical hub erected at the center of the lower flange. The caulking boss provided on the hub is passed through the caulking hole provided on the circumference at a predetermined distance from the center position of the upper flange, and the caulking protruding through the upper surface of the upper flange. A tape reel having a tip portion of a boss for welding welded, wherein a recessed locking portion is formed in the caulking hole, and a taper is formed between the locking portion and the caulking hole, The height of the resin diffused and formed by welding between the surface of the recessed locking portion and the circumferential direction along the tapered surface is such that the resin does not protrude above the depth of the recessed locking portion. A tape reel that has been characterized. (2) The tape reel according to (1), wherein the taper has an inclination angle of at least 5 degrees with respect to the surface of the recessed locking portion. (3) A step having a reduced diameter is formed between the locking portion and the caulking hole, and diffusion occurs due to welding between the surface of the recessed locking portion and the circumferential direction along the step. The tape reel according to (1), wherein the height of the resin formed is such that it does not protrude above the depth of the recessed locking portion.

In the tape reel having such a structure, the resin melted by the welding horn can be restricted from flowing at least in the upward direction of the upper flange.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, a tape reel according to the present invention will be described with reference to the drawings. Regarding the structure and assembly of the tape reel, FIG.
Since it is the same as the one shown in FIG.

As shown in FIG. 1, an ultrasonic plastic welder 19A equipped with a tape reel welding horn according to the present invention has an ultrasonic wave generator 20 and a solid horn for transmitting ultrasonic waves generated by the ultrasonic wave generator 20. 21 and a welding horn 2 that vibrates by the ultrasonic waves transmitted from the solid horn 21.
2A and 2A. Among these, the ultrasonic wave generation unit 20 and the solid horn 21 have the same configuration as that of the prior art shown in FIG. 5, and the ultrasonic wave generation unit 20 includes an oscillator 23 and a vibrator 24.
It consists of and.

As shown in FIG. 1, the welding horn 22A is formed into a rectangular shape whose cross-sectional area gradually decreases downward in the longitudinal direction, and the end face of the free end, which is the tip of the column, is formed. A structure in which a forming portion 25 for welding and caulking the caulking boss 18 and a melting guide portion 29 for restricting the flowing direction of the leaked resin out of the melted resin downward around the tip of the welding horn 22A are provided. Has become.

The molding portion 25 has a structure in which a hemispherical notch is formed in the center of the end surface of the free end which is the tip of the horn 22A, and a convex portion is provided at the notched center position. The structure is similar to that of the molding unit 25 according to the related art described above. That is, as shown in FIG. 2, the depth W1 of the deepest part formed in a hemispherical shape is shallower than the depth W2 of the recessed locking part 12 of the upper flange 11. This is to prevent the crimped portion 18A that has been welded and crimped from reaching the upper surface of the upper flange 11 so as not to hit the reel pressing spring 26 that suppresses the center of rotation of the reel 10 (see FIG. 9). .

The melting guide portion 29, as shown in FIG.
The horn 22A has a structure in which a taper is provided by cutting out a peripheral portion of an end surface of a free end portion of the horn 22A. The taper has a structure in which the end face provided with the molding portion 8 is inclined by an angle α toward the outer circumference. The preferred angle α in the embodiment is set to 5 degrees or more.

Further, this taper has a structure in which the hemispherical circumferential end portion of the molding portion 8 provided at the center of the end face of the horn 22A is tapered. It should be noted that the area of the tapered surface is not limited to this, and can be set and changed as appropriate.

When the tape reel 10 is assembled using the ultrasonic plastic welder 19A having the welding horn 22A whose tip is processed as described above, as shown in FIG. 2, the caulking boss provided on the hub 15 is used. 18 is fitted into the caulking hole 14 of the locking portion 12 of the upper flange 11 so that the tip portion of the caulking boss 18 projects to the upper surface side of the upper flange 11. In this state, the welding horn 22A is lowered to the tip portion of the caulking boss 18 in the downward direction (arrow direction) and brought into contact with the tip portion of the caulking boss 18. In this state, when the welding horn 22A is further pushed in the direction of the upper flange 11 in the arrow direction, the welding horn 22A gradually melts from the central position of the tip portion of the caulking boss 18 to form the molded portion 25 and the resin melted on the surface of the locking portion 12. Flows in. In this way, the tip portion of the caulking boss 18 melted by the molding portion 25 is formed with a hemispherical caulking portion 18A in which the central position of the shape of the molding portion 25 is depressed, and fixes the upper flange 11 and the boss 15. On the other hand, the resin remaining after being melted by the molding portion 25 flows out toward the outer periphery of the front end portion of the horn 22A from a gap between the end faces forming the locking portion 12 and the molding portion 25 (not shown), and melts the guiding portion 29. And is protruded at least in the range direction of the taper angle α. Therefore, since it is regulated in the direction along the surface of the locking portion 12, it is difficult for the resin to flow toward the upper surface of the upper flange 11, and the protruding resin is fixed within the range of the depth W2 of the locking portion 12. That is, it can be formed at a height that does not extend above the depth of the recessed locking portion 12.

Here, the welding by the welding horn 22A is
As described above, the welding horn 22A is attached to the welding portion.
It is only necessary to control the descending accuracy of the reel, but if the reel itself is downsized and the accuracy is increased, the welding mechanism itself becomes complicated. Therefore, as described in the related art, an error may occur in the descending accuracy of the welding horn 22A.

When an error occurs in the descending accuracy of the welding horn 22A, as shown in FIG. 3, the tip of the welding horn 22A bites into the surface of the locking portion 12, and the amount of melting increases. That is, when the surface of the locking portion 12 is bitten, the molding portion 2
5 and the resin melted at the end surface of the free end of the horn 22A, the resin overflowing from the molding portion 25 and the melted resin 30 that has eroded is the tapered surface of the welding guide portion 29 of the welding horn 22A. It diffuses and flows in the circumferential direction. The height of the resin 30 which is diffused and flows in the circumferential direction of the horn 22A is a height guided within the range of the taper angle α.

The leaked resin 3 formed in this way
0 is regulated so as not to go above the depth W2 of the recessed locking portion 12 and stick to the surface of the locking portion 12. Therefore, in the case of the tape reel 10 housed in the cassette shown in FIG. 9, an elongated plate-shaped reel pressing spring 26 formed of a metal member that abuts the conical protrusion 17 at the center of the reel 10. Moreover, when the reel 10 rotates, there is no contact, contact or collision, the quality of the cassette itself is improved, and adverse effects on electronic devices can be avoided.

Next, regarding a modified example of this welding horn,
A description will be given with reference to the drawings.

The welding horn 22B, as shown in FIG.
A molding portion 25 having a hemispherical cutout provided on the end surface of the free end portion of the tip portion and having a convex portion at the center portion, and a peripheral portion of the end surface of the tip portion of the horn 22B, which is smaller in diameter than the cylindrical shape. It has a structure including a notch melting guide portion 29A.

The melting guide portion 29A has a structure in which a step is formed by reducing the diameter of the column shape of the horn 22B.

Welding horn 22B having such a structure
As shown in FIG. 4, the overflowed resin that has melted when it bites into the locking portion 12 of the upper flange 11 flows upward around the outer periphery of the tip portion of the horn 22B, but hits the upper surface 31 of the melting guide portion 29A. The flow is restricted and diffused in the circumferential direction along the locking surface 12 in FIG. Therefore,
The leaked melted resin 30 is fixed along the surface of the locking portion 12.

In this way, the leaked resin 30 of the resin melted by the horn 22B due to caulking is regulated and flows in the direction along the surface of the upper flange 11 inside the recessed engaging portion 12. The upward flow of resin is restricted. Therefore, it is possible to prevent the occurrence of burrs such as resin curling over the upper flange 11 surface.

[0034]

As described above, in the tape reel according to the present invention, the flow direction of the resin melted on the outer peripheral portion of the end face of the free end of the cylindrical welding horn is regulated in the tape reel welding horn. By providing the welding guide part, when the boss is welded and caulked, there is no unnecessary turning over on the upper flange surface, it is possible to prevent the quality deterioration caused by scattering of the turning up part and the appearance. improves. Further, the allowable range for the error of the descending accuracy at the time of welding is widened, and the excellent effect of improving the productivity is achieved.

[Brief description of drawings]

FIG. 1 is an explanatory view of an ultrasonic plastic welder to which a tape reel welding horn for producing a tape reel according to the present invention is applied.

FIG. 2 is an explanatory diagram when a tape reel is welded by the same tape reel welding horn.

FIG. 3 is an explanatory diagram when the tape reel welding horn bites and is welded.

FIG. 4 is an explanatory view showing a modified example of the tape reel welding horn.

FIG. 5 is an explanatory view showing the assembly of the tape reel.

FIG. 6 is an explanatory view of an ultrasonic plastic welder to which a conventional tape reel welding horn is applied.

FIG. 7 is an explanatory diagram at the time of welding of a conventional tape reel welding horn.

FIG. 8 is an explanatory diagram when a conventional tape reel welding horn bites and is welded.

FIG. 9 is a schematic side view showing a tape reel in which a welded caulked portion has turned over.

[Explanation of symbols]

10: Tape reel 11: Upper flange 12: Locking part 13: Through hole 14: Caulking hole 15: Hub 1
6: Lower flange 17: Protrusion 18: Caulking boss 18A: Caulking 19 and 19A: Ultrasonic plastic welder 20: Ultrasonic generator 21: Solid horn 2
2, 22A, 22B: Welding welding horn 23: Oscillator 2
4: Vibrator 25: Forming part 26: Reel retainer spring 2
7: Beard-like resin 28: Cassette 29, 29A: Dissolution guide part 30: Resin 31: Surface.

Claims (3)

[Claims] 1. A tape reel comprising a disk-shaped upper flange, a disk-shaped lower flange having substantially the same shape as the upper flange, and a cylindrical hub erected at the center of the lower flange. Yes, for the caulking projecting through the caulking boss provided on the hub through the caulking hole provided on the circumference at a predetermined distance from the center position of the upper flange and penetrating the upper surface of the upper flange. A tape reel in which a tip portion of a boss is welded, wherein a recessed locking portion is formed in the caulking hole, and a taper is formed between the locking portion and the caulking hole,
The height of the resin diffused and formed by welding between the surface of the recessed engaging portion and the circumferential direction along the tapered surface is
A tape reel characterized in that the tape reel is formed at a height which does not protrude above the depth of the recessed locking portion. 2. The tape reel according to claim 1, wherein the taper has an inclination angle of at least 5 degrees with respect to the surface of the recessed locking portion. 3. A step of reduced diameter is formed between the engaging portion and the caulking hole, and welding between the surface of the depressed engaging portion and the circumferential direction along the step. The tape reel according to claim 1, wherein the height of the resin diffused and formed is not higher than the depth of the recessed locking portion.