JPS62270084A - Tape cassette - Google Patents

Abstract

PURPOSE:To lock a reel without fail, to prevent the deformation and damage of a locking claw and to improve the durability and reliability of a cassette by arranging an energizing means on the inside of the locking claw of a reel stopper and opening forcibly both locking claws to the outside by the means. CONSTITUTION:At the tip part of a sliding body 33 of a reel stopper 32 made of a synthetic resin, a pair of locking claws 34 and 35 are formed integrally, and the stopper 32 is freely slidably arranged so that it can freely go in and go out to an intermediate part 21 of a pair of reels 5 and 6. The stopper 32 is shifted to the intermediate part 21, respective locking claws 34 and 35 are engaged at tooth parts 15 and 16 provided at the outer circumference of the reels 5 and 6 and the rotation in the tape feeding direction of the reels 5 and 6 is regulated. At the tip part of the sliding body 33 of the stopper 32, a recessed part 38 is provided, and a pin-shaped locking part 39 is provided in the recessed part 38. Further, at the inside of the tip of the locking claws 34 and 35, locking projections 40 and 41 are provided, a twisting coil spring 42, which is an energizing means, is arranged at the inside of the locking claws 34 and 35 and the deformation and damage of the locking claws 34 and 35 can be prevented.

Description

[Detailed Description of the Invention] 3. Detailed Description of the Invention [Field of Industrial Application] The present invention is a tape cassette that is most suitable for application to a recording/reproducing device such as a video tape recorder,
In particular, it has a reel stopper made of synthetic resin with a pair of locking claws integrally molded at the tip of the sliding body, and this reel stopper can be slid in and out of the middle part of the pair of reels. By sliding the reel stopper toward the intermediate portion, the locking pawls are engaged with a pair of teeth formed on the outer periphery of the reels, and the reel stopper is slid toward the intermediate portion, thereby causing the locking claws to engage with a pair of teeth formed on the outer periphery of the reels. This invention relates to a tape cassette configured to restrict rotation of the tape cassette.

[Background technology and its problems]

1-3 illustrate conventional tape cassettes for video tape recorders.

First, as shown in FIG. 1, cassette M of the tape cassette
The body 1 is formed by fitting upper and lower halves 2 and 3 molded from synthetic resin, and inside this cassette housing 1 are a pair of left and right reels 5 and 6 on which magnetic tape (hereinafter simply referred to as tape) 4 is wound. is rotatably stored. The tape 4 is passed along the lower part of the front surface of the cassette housing 1,
When the tape cassette is installed in the cassette mounting position of a video tape recorder (not shown), a loading means is inserted inside the tape 4 in the bottom opening 8 of the cassette housing 1, and the tape 4 is subsequently loaded by the loading means. is configured to be Note that 9 is a front lid that covers the lower part between the front surfaces, 10 and 11 are reel hubs of reels 5 and 6, and 12 and 13 are a pair of left and right reel fitting holes provided in the bottom wall 3a of the lower half 3, and these reels The lower ends of both reel hubs 10.11 are rotatably fitted into the fitting holes 12.13, respectively.

Next, as shown in FIGS. 1 to 3, both the reels 5.6 and 6.
A toothed portion 15. is provided on the outer periphery of each of the lower flanges 5a, 6a.
16 are formed. On the other hand, a reel stopper 17 is provided on the bottom wall 3a of the lower half 3 of the force setting housing l. This reel stopper 17 is made of synthetic resin and is integrally formed with a sliding body 18 having a substantially rectangular parallelepiped shape and a pair of left and right locking claws 19 and 20 provided at the tip thereof. The locking pawls 19 and 20 are formed to have a thin wall so as to have appropriate elasticity, and are tapered so that the distance between them widens as they reach the tips 19a and 20a.

Next, the reel stopper 17 is inserted into the middle part 2 of both reels 5.
A pair of parallel guide walls 2 that are integral with the bottom wall 3a of the lower half 3 are disposed on the rear side of the lower half 3 on the left and right sides thereof.
2.23 is provided.

The reel stopper 17 is connected to both guide walls 22.
23 in the front-rear direction (direction of arrows a and b in FIG. 2) so as to be able to freely move in and out of the intermediate portion 21.
It is said to be able to slide freely. Note that arc-shaped ribs 24.25 are integrally provided on the outside of both guide walls 22.23, and the tips 22a and 23a of both guide walls 22.23 are turned inward along these ribs 24.25. It is bent.

A compression spring 26 is housed between the guide walls 22 and 23 in a compressed state between the rear end of the reel stopper 17 and the rear wall 3b of the lower half 3.

The conventional tape cassette is constructed as described above, and the reel stopper 17 is normally slid in the direction of the arrow a by the spring force of the compression spring 26, as shown by the solid line in FIG. The tips 19a, 20a of the pawls 19.20 engage with the teeth 15.16 of both reels 5.6. Rotation of the reel 5 in the direction of arrow C in FIG. 2 is prevented by a locking pawl 19, and rotation of the reel 6 in the direction of arrow d in FIG. 2 is prevented by a locking pawl 20.

Next, when the tape cassette is installed in the cassette loading position of the video tape recorder and the tape drive operation openings (none of which are shown) for recording or playback are operated, both reels 5 and 6 are unlocked. be done.

That is, when the tape cassette is installed in the cassette mounting position, the lock release bottle 28 provided in the cassette mounting position passes through the bottle insertion hole 29 provided in the bottom wall 3a of the lower half 3 and passes through the reel stopper 17, as shown in FIG. It is inserted into the bottle insertion hole 30 provided in the bottle. When the tape running operation push button is operated, the unlocking bottle 2B is automatically moved to the position shown by the imaginary line in FIG. 3 and locked.

Therefore, the reel stopper 17 is slid against the compression spring 26 in the direction indicated by the arrow in FIG. It comes off from both teeth 15 and 16 of.

Next, when a stop sO (not shown) is operated, the unlocking bottle 28 is unlocked at the forward position shown by the phantom line in FIG. 3. Then, the reel stopper 17 is moved back by the compression spring 26 in the direction of arrow a in FIG.
0a is engaged with both teeth 15.16 of both reels 5.6, locking both parts 5.6 again.

However, the conventional tape cassette constructed as described above has the following defect when the two reels 5.6 are locked by the locking claws 19, 20 of the reel stopper 17.

That is, when both reels 5.6 are locked by both image locking claws 19.20, if one reel 5 or 6 is forcibly rotated in the direction of arrow C or d, the engagement will occur. Since the retaining pawl 19 or 20 is formed thin, it will bend significantly as shown by the two-dot chain line in FIG.

In some cases, the locking pawl 19 or 20 may be damaged, making it impossible to lock the reel 5 or 6.

Next, when unlocking both reels 5.6, slide the reel stopper 17 with a limited stroke (Fig. 6. Therefore, when unlocking, both image retaining claws 19.6 must be removed from both image retaining claws 19.
20 is forcibly contracted inward against elasticity. However, the thin-walled image retaining pawls 19 and 20 are easily deformed, and if left in the unlocked state for a long period of time, they will plastically deform while remaining in the narrowed state as shown in the imaginary line. As a result, when the reels are locked, they do not return to their original shape, making it impossible to lock both reels 5 and 6.

(Object of the Invention) The present invention aims to provide a tape cassette that can correct the above-mentioned drawbacks.

[Summary of the invention]

The present invention provides the above-mentioned tape cassette, in which a biasing means is disposed inside the both image-stopping claws of the reel stopper, and the biasing means is configured to forcibly open both the image-stopping claws outward. This tape cassette has extremely high durability and reliability since both reels can be reliably locked and unlocked by a reel stopper.

〔Example〕

Hereinafter, an embodiment in which the present invention is applied to a tape cassette for a video tape recorder will be described with reference to FIGS. 4 to 9. Note that the same structural parts as those of the conventional example shown in FIGS. 1 to 3 are designated by the same reference numerals, and the explanation thereof will be omitted.

First, as shown in FIGS. 4 to 5B, the reel stopper 32 is made of a synthetic resin made of a sliding body 33 having a substantially rectangular parallelepiped shape and a pair of left and right locking claws 34 and 35 provided at the tip of the sliding body 33. Molded. Note that both image retaining claws 34 and 35 are formed to have a thick wall, and these both image retaining claws 34 and 35 themselves have sufficient strength. Further, a recess 38 is provided on the upper side of the tip of the sliding body 33 of the reel stopper 32.
A pin-shaped locking portion 39 is integrally formed within this recess 38 . Further, locking protrusions 40.41 are integrally formed inside the tips of both image locking claws 34.35. A torsion coil spring 42 (biasing means) is placed inside the image locking pawls 34 and 35 of the reel stopper 32. In other words, the one-return coil spring 42 has its coil portion at the locking portion 39.
The locking protrusion 40.4 is fitted into the recess 38 and has both ends positioned along the inside of the image locking claws 34.35.
It is locked at 1.

The tape cassette of the present invention is constructed as described above, and as shown in FIG. 5A, the reel stopper 32 is normally slid in the direction of arrow e by the spring force of the compression spring 26, and both Tips 34a, 35a of image retaining claws 34.35
are engaged with both teeth 15.16 of both reels 5.6.

Both reels 5.6 are prevented from rotating in the tape feeding direction, which is the direction of arrows r and g. At this time, both image stopping claws 34.35 are forcibly opened outward by the tearing coil spring 42, so the tips 34a, 3 of both image stopping claws 34.35
5a is engaged very securely with both teeth 15.16 of both reels 5.6. Since both image stopper claws 34 and 35 are thickly molded and have sufficient strength, for example, a forced rotational force in the direction of arrow r or g may be applied to one of the reels 5 or 6. Also, if the locking claw 34 or 35 is thick 1
There's nothing like it happening. Therefore, the reel 5 or 6 can no longer rotate in the direction of the arrow f or g, and the locking pawl 34 or 35 will not be damaged.

Next, when the tape cassette is installed in the cassette mounting position of the video tape recorder and the push button for tape running operation is operated, the ζ reel stopper 32 resists the pressure spring 26 as shown in FIG. As a result, the tips 34a, 35a of both locking pawls 34.35 are disengaged from both toothed portions 15.16 of both reels 5.6. At this time, both locking claws 34.35 are attached to the tips 22a of both guide walls 22.23.
, 23a, but even if this unlocked state remains for a long time,
Both of the thickly molded locking pawls 34 and 35 never undergo plastic deformation.

Next, when the stop button is operated, the reel stopper 32 is moved back in the direction of the arrow e by the compression spring 26, as in the conventional case, as shown in FIG. are both teeth 15.16 of both reels 5.6
is engaged to lock both reels 5.6 again. In this case, both locking claws 34 and 35 are torsion coil springs 42.
Since the locking pawls 34.35 are forcibly opened outward by the spring force, the engagement force between the tips 34a, 35a of the locking claws 34.35 and the toothed portions 15.16 of the reels 5.6 is strong. 5.6 locking is always ensured.

As shown in FIGS. 6 and 7, when the reel stopper 32 is placed inside the cassette housing 1 and the tape cassette is assembled, the upward lifting of the reel stopper 32 is integrated with the upper half 2. It is regulated by a pair of provided guide walls 43,44. As shown in FIG. 7, the torsion coil spring 42 located within the recess 38 of the reels 32 is regulated from above by both guide walls 43 and 44. Therefore, when the reel strike 7 bar 32 slides, the torsion coil spring 42 does not shift upward, and both the locking claws 34 by the torsion coil spring 42.
The locking action of 35 is extremely stable.

Note that the reel stopper referred to in the present invention is not limited to the shape shown in the embodiments, and various other shapes can be applied. Further, the biasing means referred to in the present invention is not limited to the tear coil spring shown in the embodiment, and various biasing means can be applied. For example, FIGS. 8 and 9 show modified examples of this biasing means, and in FIG. 8, a compression coil spring 46 is shown.
In this case, a small protrusion 47 is provided inside both locking claws 34.35, a compression coil spring 46 is arranged inside both locking claws 34.35, and both locking claws 34. 3
5 is forcibly opened outward. In addition, in FIG. 9, a plate spring 48 is applied, and a substantially U-shaped locking groove 49 is formed on the upper side of the tip surface of the reel stopper 32.
This locking? The central portion of the leaf spring 48 is engaged with I49, and both ends are positioned along the inside of both locking pawls 34 and 35 and locked with the locking protrusion 50. The locking pawls 34 and 35 are forcibly opened outward by the spring force of the leaf spring 48.

[Application example]

Although the embodiments of the present invention have been described above, the present invention is applicable to tape cassettes for various recording and reproducing devices other than video tape recorders and various other information processing devices.

〔Effect of the invention〕

As described above, the present invention is configured such that a biasing means is disposed inside both of the locking claws, and the biasing means forcibly opens both of the locking claws to the outside.

According to the present invention, both locking pawls are forcibly opened outward by the urging means, so that the reel can be locked extremely reliably. Both locking pawls can have sufficient strength, and a highly durable locking pawl that will not be deformed or damaged can be obtained. Therefore, the reel can be reliably locked and unlocked, and reliability can be greatly improved.

[Brief explanation of the drawing]

Figures 1 to 3 show conventional examples of tape cassettes for video tape recorders, with Figure 1 being a partially cutaway plan view of the upper half of the tape cassette, and Figure 2 showing the main parts. FIG. 3 is a cross-sectional view taken along the line ■-■ in FIG. 2. 4 to 9 show an embodiment of a tape cassette for a video tape recorder to which the present invention is applied, in which FIG. 4 is an exploded perspective view of the main parts, and FIGS. FIG. 6 is a sectional view taken along the line Vl--Vl in FIG. 5A, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 5B, and FIGS. It is a perspective view of the reel stopper in an example. In addition, in the symbols used in the drawings, 1--・------- Cassette case 5.6
−−−−−・−・−−−−−1 to reel 15, 16・−
・・・・−・・Tooth portion 21 −・・−−−～−・−・−・−・−・Intermediate portion 22,
23 ・・・・−・−・Guide wall ゛26−・−・−・−
・−・・・−・Compression spring 32−・−・−・・−・・
... Reel stopper 33----------・----
---...Sliding body 34, 35----Latching claw 42----------Torsion coil spring 46 as biasing means・・・－・・・・・・・・・－
Compression coil spring 48 serving as biasing means - - - - - - -
...This is a leaf spring that is a biasing means.

Claims (1)

[Claims] The reel stopper is made of synthetic resin and has a pair of locking claws integrally molded at the tip of the sliding body, so that the reel stopper can be moved in and out of the middle part of the pair of reels. By sliding the reel stopper toward the intermediate portion, the locking pawls are engaged with a pair of teeth formed on the outer periphery of the reels, and the reels are stopped. In a tape cassette configured to restrict rotation in the tape feeding direction, a biasing means is disposed inside both of the locking claws of the reel stopper, and the biasing means forcibly forces both of the locking claws outward. A tape cassette characterized in that it is configured to be opened.