JPH0778932B2 - Reel disk device for 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 reel disk for a small cassette deck, and more particularly, to improve the structure of the reel cap to reduce the number of parts, facilitate the assembling work, and obtain effects such as cost reduction. The present invention relates to a reel disk device for a cassette.

[0002]

2. Description of the Related Art In a conventional reel, as shown in FIGS. 7 and 8, a coil spring 3 is inserted into a boss 6 vertically protruding from the center of a reel 4 to form a hexagonal pattern in the center of a color reel 2. Disc reel 4
After being inserted so as to meet the hexagonal boss, the reel cap 1 is pushed into the disc reel 4. At this time, the color reel 2 is always lifted upward by the elastic force of the coil spring 3 and can be moved up and down by the guide of the hexagonal column so that it can rotate via the disc reel 4. Has become.

In the conventional disc reel described above, as shown in FIG. 7, the hanging jaw 2a formed on the color reel 2 is attached to the hanging jaw 7a formed on the inner diameter of the hub 7 (see FIG. 9) installed in the tape case. The hub 7 on which the tape is wound rotates as the color reel 2 rotates. When the cassette case is mounted on the color reel 2 and the reel disc 4 is inserted into the hub 7, the hook 2a of the color reel 2 and the hub 7 are inserted.
The hanging jaws 7a on the inner side of each of the two meet and join on the vertical line. At this time, unless the grooves are aligned with the hanging jaws 2a of the color reel 2 and the hanging jaws 7a of the hub 7 and are correctly inserted, the color reel 2 and the coil spring 3 are lowered. However, when the color reel 2 rotates in this state, the hanging jaw 2a of the color reel 2 is inserted into the groove between the hanging jaws 7a of the hub 7, and then the coil spring 3
Since the elastic force of (1) raises the color reel 2 upward, the color reel 2 and the hub 7 are completely connected. Therefore, the rotational force of the reel disk 4 is accurately transmitted to the hub 7 of the cassette tape.

However, in the above reel disc, the coil spring 3 is inserted into the hexagonal boss of the reel disc,
After inserting the color reel 2 onto it, the color reel 2 is set in a state of receiving an elastic force unless the cap reel 1 is pushed in while being grasped so as not to rebound by the force of the spring. Therefore, there is a problem in that the assemblability is considerably poor, and the large number of parts causes a cost increase.

Therefore, the inventor of the present application has proposed some techniques to solve the above problems.
This conventional example will be described with reference to FIGS. First, as shown in FIGS. 10 to 12, by extending and forming three circumferences of the reel cap 5 inserted into the upper portion of the boss 6 of the reel disc 4, a hanging jaw 5a as a hanging elastic piece is formed.

The hanging jaw 5a is bent downward from the bottom surface of the reel cap 5 and then further bent upward in a state where three circumferences of the reel cap 5 are cut out. Further, since the hanging jaw 5a is formed with a radius Ra larger than the radius R of the reel cap 5 and smaller than the radius Rb of the hub 7 of the cassette tape case, it can be moved in the arrow direction of FIG. it can.

Next, the operation will be described. When the hub 7 of the cassette tape case is guided and coupled to the outer peripheral edge of the cap reel 5, the groove 7b of the hook 7a of the hub 7 and the hook 5a of the reel cap 5 shown in FIG. 13 are not correctly inserted. However, if they meet straight as shown in FIG. 13, the hanging jaw 5a of the reel cap 5 is pushed inward as shown by the arrow in FIG. become. That is, the hanging jaw 5a is contracted.

When the reel disk 4 rotates in this state, the hook 5a of the reel cap 5 is moved to the hook 7 of the hub 7.
As it moves to the position of the groove 7b between a, the hanging jaw 5a of the reel cap 5 is opened by its own elastic force. That is, the rotation force of the reel is transmitted to the hub 7 by hitting the side surface of the hanging jaw 7a of the hub 7 while being restored to the original state in which it spreads.

[0009]

The structure shown in FIGS. 10 to 13 has improved the assembling property and reducing the number of parts to a considerable extent.

However, as is apparent from FIG. 10, since the hanging jaw 5a is formed by cutting out from the reel cap 5 main body, it is difficult to suppress the dimensional error of the radius Ra to a certain level or less.

As is apparent from FIGS. 12 and 13, when Ra becomes larger than a certain size, the hanging jaw 5a
Cannot be smoothly engaged with the groove 7b of the hub 7. That is, in the conventional example shown in FIGS. 10 to 13,
It has been difficult to reduce the number of defective products that cannot be smoothly engaged due to dimensional errors to below a certain level.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reel disk device for a cassette capable of ensuring smooth engagement between the hub portion of the cassette and the reel cap. .

[0013]

As a means for solving the above problems, the present invention integrally forms a reel disc and a reel cap, and the reel cap is substantially perpendicular to the reel disc. While standing up, it has a cylindrical portion on the inside in the radial direction and a plurality of elastic pieces around the outside of this cylindrical portion, and each elastic piece forms a cantilever extending from the reel disk,
On its free end side, a jaw portion is provided on the inner side in the radial direction of the reel disk, and a claw portion which engages with the hub portion of the cassette is provided on the outer side in the radial direction. Furthermore, the cylindrical portion and this cylindrical portion are provided. A cap formed with an annular flange portion that spreads outward in the radial direction at one end of the annular flange portion, the annular flange portion including at least one protrusion provided on the axial direction thereof, and the radial direction thereof. A plurality of groove portions provided on the outer periphery and having the same number as the elastic pieces of the reel cap, each of the elastic pieces being located in each of the groove portions; and The cylindrical portion of the cap is fitted inside the cylindrical portion of the reel cap, and at least one of the annular flange portions is configured to restrain the displacement of the elastic piece outward in the radial direction. Raised portion is adapted to jaws engage with the elastic pieces, it is characterized in.

[0014]

According to the above construction, the assembly is completed by a simple operation of inserting the cylindrical portion of the cap into the cylindrical portion of the reel cap and engaging the projection of the cap with the jaw of the reel cap.

Further, since the reel disc and the reel cap are integrally formed, the number of parts is only two, that is, the integrally formed product and the cap.

The claw portion that engages with the hub portion of the cassette is provided on the elastic piece of the reel cap, and the elastic piece is formed so as to stand up at a substantially right angle to the reel disk. The dimension of the claw portion for smooth engagement with can be easily performed.

Further, since the protrusion of the annular flange and the jaw of the elastic piece are engaged with each other, the displacement of the elastic piece to the outside is constrained. It is possible to minimize the deviation in the dimension of the claw portion due to the above.

[0018]

Embodiments of the present invention will be described below with reference to FIGS. In these figures, the reel disc 104
And the reel cap 105 are integrally formed.
The reel cap 105 stands up at a substantially right angle to the reel disc 104, and has a cylindrical portion 105c on the inner side in the radial direction, and three elastic pieces 105a at intervals of 120 ° on the outer periphery of the cylindrical portion 105c. have.

Each elastic piece 105a is a reel disk 10
It forms a cantilever extending from 4. On the free end side, a jaw portion 105b is provided on the inner side in the radial direction of the reel disk 104, and a claw portion 105d that engages with the hub portion of the cassette is provided on the outer side in the radial direction. The claw portion 105d has a triangular end portion so that smooth engagement can be achieved.

The cap 106 has a cylindrical portion 106c and an annular flange portion 106d that spreads radially outward at one end of the cylindrical portion 106c. The annular flange portion 106d is provided on the axial direction 3
It has one protrusion 106a and three grooves 106b provided on the outer periphery in the radial direction thereof.

Each of the elastic pieces 105a has a groove 106.
It is designed to be located inside b, and the cap 10
The cylindrical portion 106c of 6 is the cylindrical portion 1 of the reel cap 105.
It is fitted inside 05c. Then, the elastic piece 105a
In order to restrain the displacement of the outer side in the radial direction, the three protrusions 106a of the annular flange portion 106d are engaged with the jaws 105b of the elastic piece 105.

In the above structure, the claw portion 105d has the elastic piece 1.
The elastic piece 105a is formed on the reel disc 104 at a substantially right angle, as is apparent from FIG. 1 or 6. Therefore, from the viewpoint of manufacturing, the accuracy of the dimension corresponding to Ra in FIG. 10 can be improved. And since the protrusion 106a is firmly engaged with the jaw 105b,
The claw portion 105d is constrained from shifting outward, so that smooth engagement between the hub of the cassette and the claw portion 105d is not hindered.

In the assembling work, the cylindrical portion 106c of the cap 106 is replaced with the cylindrical portion 105c of the reel cap 105.
It is simplified because it only has to be inserted inside the ridge and the projection 106a and the jaw 105b are engaged with each other. Further, the number of parts is only two, that is, the product in which the reel disc 104 and the reel cap 105 are integrally formed, and the cap 106.

[0024]

As described above, according to the present invention, the assemblability can be improved and the number of parts can be reduced, and smooth engagement between the hub portion of the cassette and the reel cap can be ensured. The effect of being able to do is obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a coupling relationship between a reel cap and a cap, which is a main part structure of an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a plan view of the cap in FIG.

4 is a vertical cross-sectional view taken along the line AA of FIG.

FIG. 5 is a plan view of the reel cap in FIG.

6 is a vertical cross-sectional view taken along the line BB of FIG.

FIG. 7 is a vertical cross-sectional view showing a conventional reel structure.

FIG. 8 is an exploded perspective view of FIG.

FIG. 9 is a plan view of a cassette tape hub.

FIG. 10 is a perspective view showing a cap reel in another conventional example.

11 is a vertical cross-sectional view of the reel cap of FIG.

FIG. 12 is a vertical cross-sectional view for explaining the engagement process between the reel cap of FIG. 11 and the hub of the cassette tape.

13 is a plan view when the cap reel and the hub of the cassette tape in FIG. 12 are in a stable engagement state.

[Explanation of symbols]

 104 reel disc 105 reel cap 105a elastic piece 105b jaw portion 105c cylindrical portion 105d claw portion 106 cap 106a protrusion 106b groove portion 106c cylindrical portion 106d annular flange portion

Claims (1)

[Claims] 1. A reel disc (104) and a reel cap (105) are integrally formed, and the reel cap (105) stands up at a right angle to the reel disc (104) and has a radius thereof. And a cylindrical portion (105c) on the inner side in the direction
c) has a plurality of elastic pieces (105a) around the outer side thereof, and each elastic piece (105a) has a plurality of elastic pieces (105a).
4) forming a cantilever extending from the free end side of which a jaw (105b) is provided radially inward of the reel disc (104) and engages the hub portion of the cassette radially outward. A claw portion (105d) is provided, and further, a cylindrical portion (106c) and this cylindrical portion (106c).
(1) A cap (1) having an annular flange portion (106d) extending outward in the radial direction at one end portion of (c).
06), and the annular flange portion (106d) is provided with at least one protrusion portion (106a) provided on the axial direction of the annular flange portion (106d) and on the outer periphery in the radial direction thereof and with respect to the reel cap (105). The elastic piece (105a) has the same number of groove portions (106b) as the elastic piece (105a), and each of the elastic pieces (105a) has the groove portion (10).
6b), the cylindrical portion (106c) of the cap (106) is fitted inside the cylindrical portion (105c) of the reel cap (105), and the elastic piece (105a). ), The annular flange portion (106d) for restraining the radial outward displacement.
At least one protrusion (106a) of the elastic piece (1
The reel disk device for a cassette, which is adapted to be engaged with the jaw portion (105b) of 05).