JPS642276Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a reel stand device for audio tape recorders, video tape recorders, etc., and its purpose is to perform the original functions of the reel stand device, such as to facilitate the installation of tape cassettes. The object of the present invention is to simplify the structure, improve assembly efficiency, and reduce costs without compromising the ability to provide appropriate back tension to the tape.

A conventional reel stand device was constructed as shown in FIGS. 1 and 2. That is, a cylindrical first rotating body 1 having a motion transmitting part 1a that receives rotational force from a motor has a shaft part 1b and a cylindrical first rotating body having a claw part 3a that engages with a reel hub via a compression coil spring 2. The second rotary body 3 is fitted, and a bearing/retainer member 4 is attached to the tip of the shaft portion 1b of the first rotary body 1.
are fitted and fixed to form an integrated structure 5 of the first and second rotating bodies 1 and 3. This integrated structure 5 is fitted onto a shaft 7 implanted in a fixed substrate 6 via a compression coil spring 8, and a washer 9 is engaged with the distal end recess 7a of the shaft 7. It was meant to prevent it from slipping out.

In a conventional device having this kind of configuration, a first rotating body 1 receiving power from a motor is provided with a second rotary body 1 having a claw portion 3a that engages with a reel hub of a cassette.
After the rotating bodies 3 are integrated, the resulting integrated structure 5 is fitted onto the shaft 7 to prevent it from coming off, which increases the number of parts and man-hours, and makes assembly easier. However, it was not very good and was expensive. In particular, one of the component parts
The compression spring 2 can only be used to bias the second rotating body 3, and generates an appropriate frictional force between the first rotating body 1 and the substrate 6 to apply back tension to the tape. In order to provide this, it is necessary to provide a compression spring 8 separate from the compression spring 2, which is one of the causes of an increase in the number of parts.

Here, in order to simplify the configuration by removing the compression spring 8, the first rotating body 1 is mounted on a bearing so that the back tension is generated by the frictional force between the first rotating body 1 and the base plate 6. It must be free with respect to the stopper member 4 and must be able to slide freely in the axial direction.
In this case, it is preferable to select a compression spring 2 with an appropriate spring constant. However, if the compression spring 8 is removed, the first rotating body 1 must be loosely fitted to the bearing and retaining member 4, which increases the rattling of the first rotating body 1 relative to the shaft 7. , the second rotary body 3 having the claw portion 3a supported by the shaft portion of the first rotary body 1 also becomes rattled, which causes irregular winding of the tape and vibrations during rotation. This had the problem of having a significant negative impact on performance.

Therefore, in view of the drawbacks of the conventional art, the present invention allows for direct assembly to the shaft 7 implanted in the fixed substrate 6. In other words, a reel stand device that can be assembled without integrating the first and second rotating bodies 1 and 3 and that is inexpensive and has good performance without impairing the original functions of the reel stand device at all. This is what we provide.

Hereinafter, one embodiment of the present invention will be described with reference to the drawings from FIG. 3 onwards. In the figure, 11 is a cylindrical first rotating body having a disk-shaped motion transmitting part 11a that receives rotational force from the motor, and 12 is a cylindrical first rotating body having three claw parts 12a that engage with the reel hub of the tape cassette. is the second rotating body, and the first and second
The shaft portions 11b and 12b of the rotating bodies 11 and 12 are both formed with locking portions 11c and 12c in which one side is notched along the axial direction.
b, 12b are semi-cylindrical. 13 is a compression coil spring that urges the first and second rotating bodies 11 and 12 in different directions; 14 is a fixed substrate 1;
The shaft 16 is a washer that is engaged with a recess 14a provided at the tip of the shaft 14.

Next, the assembly of such a configuration will be explained.
The shaft portion 11b of the rotating body 11 is fitted, and the shaft portion 1
After the compression coil spring 13 is loosely fitted onto the shaft 1b, the shaft portion 12b of the second rotating body 12 is fitted onto the shaft 14. At this time, the first and second rotating bodies 11, 1
The two locking parts 11c and 12c are engaged with each other so that the two rotating bodies 11 and 12 rotate integrally around the shaft 14, and a washer 16 is attached to the tip of the shaft 14 to prevent it from coming off. Do this.

The reel stand device thus obtained is the third
5, and as is clear from this figure, the lower end of the first rotating body 11 is pressed against the pedestal portion 14b of the shaft 14 by the force of the compression spring 13, and the second The rotating body 12 has an upper end formed by a washer 16 for preventing it from coming off due to the force of the compression spring 13.
Pressed by At this time, the first rotating body 11
between the tip surface of the shaft portion 11b and the bottom surface of the second rotating body 12, and between the tip surface of the shaft portion of the second rotating body 12 and the root surface of the locking portion 11c of the first rotating body. Clearances 17 and 18 are formed between the shafts 1 and 1, and the first and second rotating bodies 11 and 12 are connected to the shaft 1 within the range of the gaps 17 and 18.
It is possible to slide in the thrust direction of 4.

Therefore, when a tape cassette is mounted on the reel stand device, the protrusion of the reel hub hits the claw portion 12a of the second rotating body 12, and the second rotating body 1
2, the second rotating body 12
resists the force of the compression spring 13, and descends by a necessary amount within the range of the gaps 17 and 18, allowing the protrusion of the reel hub to escape damage caused by collision with the claw portion 12a of the second rotating body 12. . Also, the first and second
The rotating bodies 11 and 12 are connected to the pedestal portion 14b of the shaft 14 and the washer 16 by one compression spring 13, respectively.
Therefore, by using a compression spring 13 with an appropriate spring constant, an appropriate frictional force is generated at these contact surfaces, and an appropriate back tension can be applied to the tape. Furthermore, the rotational force of the motor transmitted to the operation transmission section 11a of the first rotating body 11 is transmitted to the first and second rotating bodies 1.
The signal is transmitted to the second rotary body 12 via the locking portions 11c and 12c, and the second rotary body 12 can be rotated to perform winding of the tape, etc.

Note that the first and second rotating bodies 1 in the above embodiments
The locking parts 11c and 12c provided in the first and second rotating bodies 11 and 12 are semicircular notches, but the shape is not limited to this, and the point is that the first and second rotating bodies 11 and 12 Any type of locking part may be used as long as it is integrated in the rotational direction in a state where sliding is permitted.

As explained above, the reel stand device of the present invention is
A first rotating body that receives rotational force from a motor and a second rotating body that engages with a reel are directly fitted onto a shaft implanted in a substrate, and the first and second rotating bodies are connected to one another.
According to this invention, there is no need to integrally connect the first and second rotating bodies, and Since one compression spring has two functions, the number of parts can be reduced by at least two compared to conventional devices, and it can be assembled directly onto the shaft embedded in the board, making it suitable for industrial use. It is possible to significantly improve assembly efficiency and reduce costs. Furthermore, the engaging parts of the first and second rotating bodies are made to be able to slide freely in the axial direction, and the cross sections are circular in shape to complement each other, so that they can be freely moved in the axial direction while resisting the force of the compression spring. Since it is possible to slide in the direction of rotation and achieve integral rotation through engagement with no play in the rotational direction, it is possible to prevent the tape from sagging and to enable stable running of the tape, providing a high-performance and inexpensive reel stand device. It is something. Further, the first rotating body supported by a shaft implanted in the substrate is slidable with respect to the second rotating body, and the second rotating body has a claw portion that engages with the reel. Since it is supported so as to be slidable and rotatable along the axis (in other words, the bearing and retaining member 4 shown in the conventional example and the second rotating body 3 are integrated), the first, The rattling that occurs when the second rotary body is slidably connected has less impact as rattling in the claws, and it is less likely to cause uneven tape winding or vibration during rotation, which improves performance. The impact on the environment can also be kept to a minimum.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a conventional reel stand device, Fig. 2 is a side sectional view of the same device, Fig. 3 is a perspective view of a reel stand device according to an embodiment of the present invention, and Fig. 4 is an exploded perspective view of the same device. An exploded perspective view, FIG. 5 is a side sectional view of the device,
Figure 6 is a top view of the device, and Figure 7 is A-A in Figure 5.
It is an A-line sectional view. DESCRIPTION OF SYMBOLS 11...First rotating body, 11a...Motion transmission part, 12...Second rotating body, 12a...Claw part, 1
3... Compression spring, 14... Shaft, 15... Board, 1
6...Watsiya.

Claims (1)

[Scope of utility model registration request] a shaft implanted in the substrate; a first rotary body having a motion transmitting portion that receives rotational force from the motor; and slidably and rotatably supported along the shaft; and a pawl that engages with the reel. a second rotating body that is slidably and rotatably supported along the axis; and a second rotating body that is interposed between the first and second rotating bodies, and that a compression spring that presses the second rotating body toward a retaining member provided at the tip of the shaft;
A first member that is provided on each of the first and second rotating bodies, is slidable in the axial direction, has a circular cross-sectional shape complementary to the other, and rotates the first and second rotating bodies integrally. , a second engaging portion.