JP3484898B2 - Reel for tape cassette - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape cassette used in a magnetic recording / reproducing apparatus, for example, a recording / reproducing apparatus such as a video tape recorder (VTR).
The present invention relates to reels for tape cassettes such as mm video cassettes and digital video cassettes.

[0002]

2. Description of the Related Art Conventionally, in a tape cassette rotatably incorporating a pair of tape reels in which a tape-shaped medium is wound inside a case, a hub portion and a lower flange are integrally formed on the tape reel, and an upper flange is formed on the hub portion. A type in which the upper flange is positioned at the root portion of the caulking boss provided at least at three locations on the outer circumference of the pivot (Jpn. Pat. Appln. KOKAI No. Sho 63-38467), or the caulking boss is fitted. In addition to the one (Japanese Utility Model Publication No. 51-23257), an assembly method (the Japanese Utility Model Publication No. 59-157283) that integrates without crimping is known.

[0003]

However, in this assembly method, the engaging portion may be damaged due to insufficient strength against impact due to dropping or the like, and in the case of positioning the caulking boss, the upper flange portion may be damaged. The periphery of the hole into which the caulking boss is inserted has a thinner wall thickness than the other portions for accommodating the resin during caulking. In other words, the hole is open in the positioning part of the upper flange, and the peripheral part of the hole is thin because the resin is accommodated during caulking, so the strength is weak because the wall thickness is thin, and cracks occur depending on the force of welding. It is also a problem. Also, in Japanese Utility Model Publication No. 59-23257, since the hole corresponding to the clamp is opened in the upper flange, the hole portion of the clamp portion and the upper flange must be aligned at the time of assembling, which is a drawback of poor assembling workability. there were. The present invention is intended to eliminate these conventional drawbacks, and when caulking and integrating, the positioning of the upper flange can be made extremely easy and reliable, and the presence of the positioning rib reinforces the flange to prevent drop impact. It is an object of the present invention to provide a tape cassette reel which is durable and has an excellent operability in assembling because there is no direction of the upper flange at the time of assembly at low cost.

[0004]

DISCLOSURE OF THE INVENTION According to the present invention, a pair of tape reels consisting of a lower flange having a hub portion and an upper flange are rotatably housed in a case consisting of an upper case and a lower case, and the tape is taken from one tape reel. The tape is wound around the front surface of the case and wound around the other tape reel, and there is a recess into which the clamp fits in a part of the tape winding portion of the hub portion. A tape in which a drive shaft insertion concave portion is provided via a rib, a pivot is provided at the center of the hub portion, and caulking bosses are provided at at least three locations on the outer periphery thereof, and an upper flange is fitted and fixed to the caulking boss. In the cassette reel, a fitting hole into which the caulking boss is inserted is provided in the center of the upper flange, and a rib is provided only on the outer periphery of the fitting hole on the lower surface side of the upper flange.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The tape reel used in this tape cassette is a reel for winding a tape integrally formed with a lower flange and a reel for tape cassette in which the upper flange is integrated by caulking. On the winding surface side (lower surface side), ribs are provided in the outer periphery of the pivot in the vicinity of the fitting holes into which caulking bosses provided at at least three locations are inserted, so that the ribs can reinforce the vicinity of the holes of the upper flange. In addition, the caulking bosses can be assembled regardless of the insertion direction of the upper flange by arranging them at equal intervals larger than the central angle created by the recess where the clamp fits, greatly improving the assembly workability. It is a reliable product with high product value and high productivity.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to an example of a DVC (digital video cassette) shown in FIGS. 1 to 4. A pair of tape reels 2 and 2 around which a tape 1 is wound are rotated inside a case 3 composed of upper and lower cases. Opening 13 is formed on the left and right so that the tape 1 can be accommodated and communicates with the outside, and the tape 1 is stretched from one tape reel 2 through one opening 13 to the front of the case, and the other opening 13 is used to re-seal the case. The tape is wound onto the other tape reel 2 and is wound on the other tape reel 2. The front lid 4 covers the tape front surface of the tape 1 stretched around the case front surface, the upper lid 5 covers the tape upper surface, and the rear lid 6 covers the tape rear surface. , A lid opening / closing mechanism capable of selectively exposing the tape 1 is provided,
Then, a reel brake member 7 for suppressing the rotation of the tape reel 2 is detachably provided on the tape reel 1 so that the tape does not loosen. The tape reel 2 including the lower flange 21 having the hub portion 20 and the upper flange 22 has a clamp 23 at a part of the tape winding portion of the hub 20.
There is a recess 24 into which the drive shaft insertion recess 2 is inserted via a meat-relief recess 25 and a rib 26 inside the tape winding portion.
7 is provided, and a pivot 30 is provided at the center of the hub portion 20.
And at least three bosses 2 for crimping on the outer circumference
9 is a tape reel 2 for a tape cassette in which the upper flange 22 is fitted and fixed to the pivot 30 and the caulking boss 29, and a fitting hole into which the caulking boss 29 is inserted on the lower surface side of the upper flange 22. A rib 32 is provided in the vicinity of 31, for example, the outer peripheral side so as to be easily assembled.

In this case, the caulking bosses 29 are preferably arranged at equal intervals h at a position larger than the central angle g of the recess into which the clamp is fitted. Also, the rib 32
It is preferable that the position of the rib 32 is provided so as to include a position where the clamp fitting recess 24 is brought into contact with the outer wall of the clamp fitting recess 24.
It is also considered to lengthen the length to guide the flange at the time of assembly.

Although there is a drive shaft insertion recess 27 of the apparatus on the back side of the hub unit 20, if the hub unit 20 and the drive shaft insertion recess 27 are simply integrated, the thickness becomes thicker and the surface accuracy of the hub unit 20 becomes higher. Since it becomes worse, a meat-thief recess 25 is provided from the upper surface and is partially reinforced by ribs 26. A pivot 30 is provided on the upper surface of the hub portion 20 and is pressed downward by the reel spring 9 attached to the upper case 3. Since the caulking bosses 29 are provided at three positions (120 degree intervals), the upper flange 22 has three fitting holes 31 into which the caulking bosses 29 are inserted, and the pivot 30 of the reel hub is inserted in the center. There is a central hole 33. A recess 34 is formed around the fitting hole 31 so that the melted portion can be accommodated when the caulking is performed. A rib 32 is provided on the tape surface side on the outer peripheral side of the fitting hole 31. At the time of assembly, the rib 32 reinforces the recess 34 in which the fitting hole 31 and the center hole 33 are also opened.

The position of the caulking boss 29 is larger than the central angle g of the clamp recess 24 shown in FIG.
Since the upper flange can be inserted from any direction at the time of assembly, the upper flange 22 can be positioned smoothly and reliably. That is, the adjoining caulking bosses 29 of the hub portion 20 are provided at equal intervals at angles larger than the respective centers formed by the clamp recesses 24, and fitting holes 31 for inserting the caulking bosses are provided at positions corresponding to this on the upper flange 22. A rib 32 is provided on the outer peripheral portion of the fitting hole 31 so as to enter the concave portion 25 of the hub portion 20 so that the rib 32 can be easily assembled wherever the hole matches the boss. Further, there is a recess for fusion in the upper surface of the reel flange, and the periphery of the fitting hole 31 has a thin shape as shown by the broken line in FIG.
Further, the strength is insufficient due to the presence of the fitting hole 31, but the strength of the product can be improved by providing the rib 32.

The reel brake member 7 is located on the rear side of the case and is constantly urged toward the tape reel 2 by a spring 17 so that when the reel brake member 7 is mounted on the device, the brake release member of the device is released. As a result, the tape reel 2 slides rearward, disengages from the tape reel 2, and the tape reel 2 can rotate. In addition, the reel brake member 7
A guide rib (not shown) is provided on the upper case 1 for smoothing the movement of the.

In this embodiment, a spring 9 for pressing and supporting the reel hub 2 is provided in the upper case 3, and a lid lock 10 and a plug 1 fixed to the lower case 3 by the spring.
4 and MIC detector 15 and optical cover 16. In the figure, 18 is a front lid spring and 28 is a gate.

[0012]

According to the present invention, a pair of tape reels including a lower flange having a hub portion and an upper flange are rotatably housed inside a case consisting of upper and lower cases, and the tape is stretched from one tape reel to the front surface of the case. The tape is wound around the other tape reel, and there is a recess in which the clamp fits in a part of the tape winding portion of the hub portion. A tape cassette reel in which a drive shaft insertion concave portion is provided, a hub is provided with a pivot at the center, and at least three bosses for caulking are provided on the outer periphery thereof, and an upper flange is fitted and fixed to the boss for caulking, By providing a rib on the lower surface side of the upper flange in the vicinity of the fitting hole into which the caulking boss is inserted, the rib has the effect of reinforcement and can withstand a drop impact. The mounting angle is larger than the central angle formed by the recess where the pump fits, and it is arranged at equal intervals so that it does not touch the recess. It is easy and can be handled safely, has a simple structure, and can greatly improve productivity.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

2A and 2B show the tape reel of the example of FIG. 1, in which FIG. 2A is an enlarged plan view of a lower flange thereof, FIG. 2B is a vertical sectional view taken along line AA, and FIG. 2C is a plan view of an upper flange. .

3A is an enlarged vertical sectional view taken along the line BB in FIG. 2, FIG. 3B is a bottom view, and FIG. 3C is a partially enlarged detailed sectional view.

FIG. 4 is an enlarged perspective view of the assembled state of the present invention.

5 is an enlarged plan view of the assembled state of FIG. 4. FIG.

6 is a vertical sectional view taken along the line CC of FIG.

[Explanation of symbols]

1 tape 2 tape reel 3 cases 4 front lid 5 Top lid 6 Rear lid 7 reel brake member 9 springs 17 spring 20 Hub section 21 Lower flange 22 Upper flange 23 Clamp 24 recess 25 Meat steal recess 26 ribs 27 Drive shaft insertion recess 29 Crimping boss 30 pivot 31 Fitting hole 32 ribs 33 Center hole

   ─────────────────────────────────────────────────── ─── Continued front page       (56) Reference JP-A-2-62776 (JP, A)                 JP-A-4-228162 (JP, A)                 Actual Kaihei 1-355583 (JP, U)                 63-87689 (JP, U)                 Actual Development Sho 61-136383 (JP, U)

Claims (3)

(57) [Claims] 1. A pair of tape reels each comprising a lower flange having a hub portion and an upper flange rotatably housed in a case consisting of an upper case and a lower case. The tape reel is wound around the tape reel, and a recess is formed in a part of the tape winding portion of the hub to which a clamp fits, and a drive shaft is provided inside the tape winding portion through a meat stealing recess and a rib. insertion recess is provided, and a pivot at the center of the hub portion, also comprising a caulking boss at least three locations in its periphery, the upper flange in the tape reel cassette fitting fixed to the caulking bosses, the upper Inserting the caulking boss in the center of the flange
Is provided on the lower surface side of the upper flange.
A tape cassette reel characterized in that a rib is provided only on the outer peripheral side of the fitting hole . 2. A re <br/> Bed provided on the lower surface side of the upper flange, protruding from the outer periphery of the fitting hole saw write enters the cutaway concave portion of the inner said hub portion, meat steal Center of upper flange of recess
It is arranged so as to substantially contact the outer wall surface with respect to
Tape cassette reel according to claim 1, wherein that. Wherein said caulking bosses, the recesses central angle tape reel cassette according to claim 1 or 2, wherein are deployed at equal intervals on the position of an angle larger than the fitting the said clamp.