JPH10302435A - Tape cassette device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce equipment cost for calking a reel spring on the case and to make a plastic part easily separable from a metallic part at the time of scraping the device by engaging the base part of the reel spring with the case freely attachably and detachably and providing the case with a part for controlling the rotation of the reel spring. SOLUTION: The base part 4a of a reel spring 4 is engaged with the upper shell 51 of the case, freely attachably and detachably and also unrotatably, through an integrally-formed diameter-variable boss part 6 and a rotation preventing rib. As a result, since it eliminates the need of the engagement by calking, the equipment cost can be reduced which is for calking such as an ultrasonic welding machine, facilitating separation of the reel spring 4 of the metallic parts from the plastic part including the upper shell 51 of the case at the time of scraping the tape cassette device, and also enabling the reel spring 4 to be reused as it is subjected to less deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to, for example, a VTR (V
AV such as video tape recorder)
The present invention relates to a tape cassette device used for (Audio-Visual) equipment, and more particularly, to a tape cassette device having a reel spring that presses a center portion of a tape reel to stabilize its rotation.

[0002]

2. Description of the Related Art As a conventional tape cassette device, for example, there is one as shown in FIG. The figure is 8mmVT
FIG. 2 is an exploded perspective view of a tape cassette device for R. In this tape cassette device, an entire case portion is mainly formed by an upper shell 51 (upper case portion) and a lower shell 52 (lower case portion). Accommodates a pair of tape reels 55, 55.

On the front side of the upper shell 51 and the lower shell 52, that is, on the side on which the magnetic tape 58 running between the tape reels 55 and 55 runs (the lower right side in the figure), the magnetic tape 58 is placed outside and inside. An A-lid 60 and an M-lid 61 are provided as protection members that sandwich and protect from the distance.

[0004] When the tape reels 55, 55 around which both ends of the magnetic tape 58 are respectively wound rotate in the VTR and the magnetic tape 58 runs, the tape reels 55, 55 move in their axial direction or vibrate. If this occurs, the position of the magnetic tape 58 with respect to the magnetic head (not shown) moves or vibrates, so that the recording or reproduction operation cannot be performed smoothly.

Therefore, in order to rotate the tape reels 55 and 55 stably so that they do not move in the axial direction, a central portion of each of the tape reels 55 and 55 is provided with a pair of reel springs 64. The distal end portion 64a is in contact with and pressed, and the proximal end portion 6 of the reel spring 64 is pressed.
4b is locked to the upper shell 51.

As the reel spring 64, a metal leaf spring such as a spring steel plate is often used. The reel spring 64 using such a metal leaf spring has a small dimensional change with respect to the surrounding environment, has excellent wear resistance with respect to a reel rotating at a high speed, and has a small variation in friction coefficient. Has the advantage of

FIG. 14 is a view showing an assembled state of the tape cassette device of FIG. 13, FIG. 15 is a sectional view taken along line AA of the tape cassette device of FIG. 14, and FIG. 17 is a sectional view of the tape cassette device shown in FIG. 15 taken along line BB. As shown in FIG. 15, the tip end 64a of the reel spring 64 is
17, the rear end portion 64b of the reel spring 64 is swaged and locked to the upper shell 51 side as shown in FIG.

FIG. 18 is a view showing a procedure for attaching the reel spring 64 to the upper shell 51. First, FIG.
As shown in (a), the outer side of the upper shell 51 is placed downward (turned over), and the mounting hole 64c formed in the reel spring 64 is fitted into the caulking boss 51a formed on the upper shell 51 side. Let it.

Next, using an ultrasonic welding machine, FIG.
As shown in FIG. 18 (c), the crimping recess 66a formed on the tip end surface of the welding horn 66 is pressed against the tip of the crimping boss 51a, and heated by applying ultrasonic vibration while applying pressure, as shown in FIG. Then, the swaged boss 51a is melted and deformed. The reel spring 64 around the mounting hole 64c is locked to the upper shell 51 by the swaged boss 51a thus deformed.

[0010]

However, in the method of locking the reel spring 64 to the upper shell 51 by caulking as described above, a special welding machine for caulking is required. The equipment cost will increase accordingly.

Further, after the caulking boss 51a is heated and melted, it takes time to cool and solidify.
Poor assembly efficiency. Further, at the time of caulking, after the reel spring 64 was temporarily placed at a predetermined position with respect to the upper shell 51, while the upper shell 51 was transported to the welding machine, the reel spring 64 was temporarily placed at a predetermined position due to vibration or the like. There is a problem such as displacement from the position.

In the case of recycling the tape cassette unit or discarding the unit, it is necessary to separate the plastic part from the metal part. At the time of this separation, in the above-described method of locking the reel spring by caulking, if the reel spring 64 is to be separated from the upper shell 51, the reel spring 64 is greatly deformed and can be reused as it is. Disappears. Further, as described above, caulking boss 51a
There is a problem that the crushed portion after melting and caulking becomes excessive plastic garbage and increases the amount of garbage.

In view of the above problems, the present invention can reduce equipment costs for caulking a reel spring to a case part, and can easily separate a plastic part and a metal part when disposing of the apparatus. An object of the present invention is to provide a tape cassette device that is advantageous in recycling parts and reducing waste.

[0014]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, according to the present invention, a base end portion is locked to a case portion, and a front end portion presses a center portion of the tape reel to stabilize rotation of the tape reel. In the tape cassette device provided with a reel spring, the base end portion is detachably locked to the case portion, and is fitted to both sides of the base end portion to restrict rotation of the reel spring. The movement restricting portion is formed on the case portion.

According to the tape cassette device having such a configuration, since the base end of the reel spring is detachably engaged with the case portion, there is no need to engage by caulking. It is possible to reduce equipment costs for caulking such as.

Further, since the reel spring can be easily removed from the case portion, when the tape cassette device is disposed of, the plastic portion such as the case portion and the reel spring of the metal component can be easily separated. At this time, the deformation of the reel spring is small, so that it can be reused (recycled). In addition, since there is no crushed portion which is generated when the crimping head is crimped unlike the conventional case, there is no need for the conventional method. Garbage can be prevented from increasing.

[0017]

Embodiments of the present invention will be specifically described below with reference to the drawings. 1 to 8
FIG. 1 is a view showing a first embodiment of a tape cassette device according to the present invention.

FIG. 2 shows the upper shell 51 of the tape cassette device.
FIG. 1 is a diagram showing the inside of the (case portion), and FIG. 1 is a diagram showing a cross-sectional view of the upper shell 51 in FIG. 2 taken along the line CC. FIG.
As shown in the figure, the base end 4a of the reel spring 4 is detachably locked via a variable diameter boss 6 formed integrally with the upper shell 51.

That is, as shown in FIG. 16, the conventional reel spring 64 is formed in a substantially rectangular shape, whereas the reel spring 4 according to the present embodiment is formed.
As shown in FIG. 3, not only is formed in a substantially rectangular shape, but also a base end 4a is formed in a hat-shaped cross-sectional shape having a height T.

An oval positioning hole 4b having a major axis L and a minor axis S is formed in the hat-shaped ceiling of the base end 4a, and the major axis L extends in the width direction of the reel spring 4. It is formed in such a direction as to do. The tip 4c of the reel spring 4 presses the reel top 55a of the tape reel 55 as shown in FIG. 15 to stabilize the rotation of the tape reel 55.

FIGS. 4 and 5 show the variable diameter boss 6. The variable-diameter boss 6 has a cylindrical portion 6a and a tapered truncated cone-shaped head 6b integrally formed at the tip end thereof, and a slit G in a slit shape over the entire length. Therefore, as shown in FIG. 5, when a force is applied from both sides of the variable diameter boss portion 6, the gap G is crushed, and the diameter in the direction perpendicular to the diametrical direction in which the gap G of the head 6b extends is crushed and reduced. Become.

For this reason, the short axis of the positioning hole 4b is S, the diameter of the cylindrical portion 6a is S ₀ , the larger diameter of the head 6b is S ₁ , and the diameter when the diameter S ₁ is crushed is S ₂ . Then, the following relational expression is established. S ₁ >S> S ₂ > S _{0 Further} , assuming that the major axis of the positioning hole 4b is L and the length of the larger gap G of the head 6b is L ′, L> L ′, and S ₀ < The relationship L 'needs to be established.

FIG. 6 is a diagram showing a procedure for attaching the reel spring 4 to the variable diameter boss portion 6. First, upper shell 5
The reel spring 4 is moved closer to the variable-diameter boss 6 with the positioning hole 4b provided in the reel spring 4 facing the head 6b of the variable-diameter boss 6 with the outer side of the reel 1 facing downward (FIG. a)).

Then, the positioning hole 4b provided in the reel spring 4 is fitted into the head 6b of the variable diameter boss portion 6 and pushed in (see FIG. 6B). Then, as shown in FIG. 5, the head 6b of the diameter-variable boss 6 is deformed so that the gap G is crushed and the diameter is reduced. When the positioning hole 4b of the reel spring 4 is completely pushed into the head 6b of the variable diameter boss 6, the head 6b of the variable diameter boss 6 is
penetrate b. Then, the force applied from both sides of the head 6b is suddenly removed, and the head 6b of the variable diameter boss 6 returns from the state shown in FIG. 5 to the state shown in FIG.

For this reason, the base end 4 of the reel spring 4
a is locked by the head 6b of the variable diameter boss portion 6 so that the reel spring 4 does not come off.
(See FIG. 6C). The height T of the hat-shaped cross-sectional shape of the reel spring 4 is as shown in FIG.
4 is fitted and locked to the height T 'of the cylindrical portion 6a of the variable diameter boss portion 6 in FIG. 4, so that T is more elastically deformable than T' in order to prevent the reel spring 4 from rattling. It is desirable to be slightly larger or at least equal within the area.

As shown in FIG. 7, a pair of rotation preventing ribs 8 (rotation restricting portions) are provided on both sides of the base end 4a of the reel spring 4 locked by the variable diameter boss portion 6. 5
It is formed so as to be integrally protruded from 1. Such a pair of rotation preventing ribs 8 is used as the base end 4a of the reel spring 4.
Is provided close to both side portions of the reel spring 4, it is possible to prevent the tip portion 4 c of the reel spring 4 from rotating around the variable diameter boss portion 6.

As described above, the tip 4 of the reel spring 4
As shown in FIG. 8A, the center C2 of the leading end 4c of the reel spring 4 and the center C1 of the tape reel 55 are And the reel spring 4 can appropriately press the center of the tape reel 55.

If the tip 4c of the reel spring 4 rotates around the variable diameter boss 6, the center C2 of the tip 4c of the reel spring 4, as shown in FIG. The center portion C1 of the tape reel 55 no longer coincides with the tape reel 55, causing a shift f.
Cannot properly press the center of the tape reel 55, so that a stable spring force and its pressing direction cannot be guaranteed.

In the worst case, the reel spring 4
The center of the leading end 4c of the tape reel 55 is largely deviated from the center of the tape reel 55, and the tape reel 55 cannot be held down and becomes free. When used in a VTR, the tape reel 55 does not rest on the reel base on which it is mounted. There is a possibility that the reel 55 will flutter and cannot be used.

However, as described above, in the present embodiment, since the rotation preventing rib 8 is provided, the tip end 4c of the reel spring 4 is prevented from rotating around the variable diameter boss portion 6, and Such a situation can be reliably prevented.

FIG. 9 is a view showing a reel spring 14 according to a second embodiment of the tape cassette device according to the present invention. In the reel spring 4 according to the first embodiment, as shown in FIG. 3, the entire width of the base end portion 4a of the reel spring 4 is bent to form a hat-shaped cross section. The reel spring 14 according to the second embodiment is different from the reel spring 14 in that only the center portion 14a in the width direction at the base end is formed by squeezing or cutting to form a hat-shaped cross section. It is.

According to the second embodiment thus constructed, both sides of the base end of the reel spring 14 are
Can be uniformly contacted over the entire length of the pair of rotation preventing ribs 8 shown in FIG. 5, so that the rotation of the reel spring 14 around the variable diameter boss portion 6 can be more reliably prevented.

FIGS. 10 and 11 show a reel spring 24 according to a third embodiment of the present invention. In the first embodiment, the positioning hole 4b is formed in the base end portion 4a of the reel spring 4. On the other hand, the reel spring 24 according to the third embodiment has a groove instead of a hole. 24a are formed and the grooves 2a are formed.
The difference is that stopper portions 24b whose height is higher than the cylindrical portion 6a of the variable diameter boss portion 6 are formed on both sides in the middle of 4a.

Such a reel spring 24 is shown in FIG.
A groove 24a is provided between the pair of rotation preventing ribs 8 shown in FIG.
When it enters from the end on the side and slides in the horizontal direction (left direction in the figure), the stopper portion 24b moves the head 6b of the variable diameter boss portion 6 in the middle so that the diameter in the vertical direction in the figure becomes smaller. When the stopper portion 24b passes through the head portion 6b while deforming, the head portion 6b of the variable diameter boss portion 6 returns to its original shape so as to have a larger diameter.

Then, the head 6b of the variable diameter boss portion 6 is locked to the stopper portion 24b and the upper surface 24c of the reel spring 24, and the reel spring 24 does not easily come off from the variable diameter boss portion 6, and thus the reel Spring 24
Is fixed in the upper shell 51 and presses the center of the tape reel 55.

FIG. 12 is a view showing a reel spring 34 according to a fourth embodiment of the present invention. In the first embodiment, an elliptical positioning hole 4b is formed at the base end of the reel spring 4. On the other hand, in the fourth embodiment, the base end of the reel spring 34 is formed. A difference is that a gourd-shaped positioning hole 34a is formed, and a member corresponding to the variable diameter boss portion 6 is a solid boss portion having no slit at the center.

[0037] In the fourth embodiment, the larger the diameter of the positioning hole 34a of the gourd-shaped, the diameter of the head of the solid type boss (same as S ₁ in FIG. 4) have a larger diameter and it is, smaller diameter of the positioning hole 34a of the gourd-shaped is smaller than the diameter of the head of a solid-type boss, and the diameter of the cylindrical portion (same as S ₀ in Fig. 4) have a larger diameter ing.

Therefore, when attaching the reel spring 34 to the solid boss portion, the larger diameter of the gourd-shaped positioning hole 34a is fitted into the head of the solid boss portion, and A predetermined contact surface is placed on the upper shell 5
By contacting the inner surface of the head 1 and then sliding in the horizontal direction, the smaller diameter of the gourd-shaped positioning hole 34a is engaged with the lower part of the head of the solid boss (the upper end of the column). And stop. As a result, the reel spring 34 is positioned and prevented from coming off.

[0039]

As described above, according to the present invention,
Since the base end of the reel spring is detachably locked to the case, it is not necessary to lock the base by caulking, so that it is possible to reduce equipment costs for caulking with an ultrasonic welding machine or the like. .

Further, since the reel spring can be easily removed from the case portion, when disposing of the tape cassette device, the plastic portion such as the case portion can be easily separated from the metal component reel spring. At this time, the deformation of the reel spring is small, so that it can be reused (recycled). In addition, since there is no crushed portion which is generated when the crimping head is crimped unlike the conventional case, there is no need for the conventional method. Garbage can be prevented from increasing.

Further, since there is no need to melt the caulking boss 51a (see FIG. 18 (c)) or to cool and solidify the boss 51a (see FIG. 18 (c)), the assembly efficiency can be improved.

Further, since the reel spring 4 is locked to the variable diameter boss portion 6 and fixed to the upper shell 51 at the same time, after temporarily placing the reel spring 64 at a predetermined position as in the prior art (FIG. 18 ( No displacement occurs during the transfer of b)).

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of the reel spring 4 and an upper shell 51 of FIG. 2 taken along line CC.

FIG. 2 is an inside view of the upper shell 51 according to the first embodiment of the tape cassette device according to the present invention.

FIG. 3 is a view showing a reel spring 4;
FIG. 3A is a plan view and a partially enlarged view of a positioning hole 4b, and FIG. 3B is a cross-sectional view of the reel spring 4 of FIG.

4A and 4B are diagrams showing a state before the deformation of the variable diameter boss portion 6, wherein FIG. 4A is a plan view thereof, and FIG. 4B is a side sectional view thereof.

5A and 5B are diagrams showing a state of the variable diameter boss portion 6 when deformed, FIG. 5A is a plan view thereof, and FIG. 5B is a side sectional view thereof.

6A and 6B are views showing a procedure when the reel spring 4 is locked by the variable diameter boss portion 6, FIG. 6A is a view showing a state before the locking, and FIG. FIG. 6C is a diagram showing a state at the time of stopping, and FIG. 6C is a diagram showing a state after the locking.

7A and 7B are views showing a round D portion of the upper shell 51 in FIG. 2, FIG. 7A is an enlarged view of a locking portion of the reel spring 4, and FIG. It is a sectional view taken on line -F.

8A and 8B are diagrams showing a positional relationship between the tip end portion 4c of the reel spring 4 and the tape reel 55, wherein FIG. 8A is a cross-sectional view showing a normal positional relationship, and FIG. FIG.

9 is a view showing a reel spring 14 according to a second embodiment of the tape cassette device according to the present invention, FIG. 9 (a) is a plan view thereof, and FIG. 9 (b) is a view of FIG. 9 (a). G-
It is G sectional drawing.

FIG. 10 is a view showing a reel spring 24 according to a third embodiment of the tape cassette device according to the present invention;
FIG. 10A is a plan view thereof, and FIG.
FIG. 3A is a sectional view taken along line HH of FIG.

11 is a partially enlarged view of the reel spring 24 of FIG. 10, and FIG. 11 (a) is a plan view of a locking portion thereof, FIG.
FIG. 12B is a sectional view taken along line II of FIG.

FIG. 12 is a view showing a reel spring according to a fourth embodiment of the tape cassette device according to the present invention;
FIG. 12A is a plan view thereof, and FIG.
It is a JJ line sectional view of (a).

FIG. 13 is an exploded perspective view showing a conventional tape cassette device.

FIG. 14 is an external perspective view showing a conventional tape cassette device.

FIG. 15 is a cross-sectional view of the tape cassette device in FIG.
It is a line sectional view.

FIG. 16 is a perspective view of a conventional reel spring 64.

17 is a sectional view taken along line BB of the locking portion of the reel spring 64 in FIG.

FIG. 18 is a sectional view showing a procedure for attaching the reel spring 64 to the upper shell 51.

[Explanation of symbols]

4 ... Reel spring, 4a ... Base end, 4b ... Positioning hole, 4c ... Top end, 6 ... Variable diameter boss part, 6a ... Cylinder part,
6b: head, 8: anti-rotation rib, 14: reel spring, 14a: central part in the width direction, 24: reel spring,
24a: groove, 24b: stopper, 34: reel spring, 34a: positioning hole, 51: upper shell, 51a ...
Caulking boss, 52: lower shell, 55: tape reel, 5
5a: reel top, 58: magnetic tape, 60: A lid, 61: M lid, 64: reel spring, 64a
... Tip, 64c. Mounting hole, 66. Welding horn, 6.
6a: caulking recess, C1, C2: center, f: misalignment, L
... long axis, S ... short axis, T, T '... height

Claims (4)

[Claims] 1. A tape cassette device having a base end portion locked to a case portion and a front end portion pressing a center portion of the tape reel to stabilize rotation of the tape reel, wherein the base end portion is The case portion is detachably locked to the case portion, and a rotation restricting portion that fits on both sides of the base end portion to restrict the rotation of the reel spring is formed in the case portion. Tape cassette device. 2. A hat-shaped cross-sectional shape having an elliptical positioning hole at a base end of the reel spring, and a boss having a head whose diameter changes in one direction is formed at the case. 2. The tape cassette according to claim 1, wherein the base end portion is detachably locked to the case portion via the positioning hole and the hat-shaped cross-sectional shape by a change in a diameter of a head portion. apparatus. 3. A boss portion having a hat-shaped cross-sectional shape having a groove at a base end portion of the reel spring and having a stopper portion, and a head portion having a diameter changing in one direction in the case portion. The base portion is detachably locked to the case portion through a hat-shaped cross-sectional shape having the groove and the stopper portion by changing the diameter of the head portion. 2. The tape cassette device according to 1. 4. A hat-shaped cross-sectional shape having a gourd-shaped positioning hole at a base end of the reel spring, a boss having a head in the case portion, and a small size of the gourd-shaped positioning hole. 2. The tape cassette device according to claim 1, wherein the base end portion is detachably locked to a head of the boss portion through one diameter.