JPH0438585Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a tuning dial device for performing tuning operation of a tuner.

(B) Prior Art A tuning dial device is known that performs a tuning operation of a tuner by rotating a tuning dial to move a pointer that displays a reception frequency. As shown in, for example, Japanese Utility Model Application Publication No. 59-177227, the tuning dial device has a dial thread with a pointer fixed to a shaft serving as a rotation axis of the tuning dial, which is wound many times. The pointer is configured to move by rotating the pointer. The tuning dial device also includes:
It is necessary to rotatably attach the shaft to a pedestal, and as shown in Japanese Utility Model Application Publication No. 61-35432, for example, a fitting groove is provided on the outer periphery of the tip of the shaft, and an E-ring is attached to the fitting groove. Alternatively, it can be rotated freely by fitting a C ring.

By the way, some popular tuners use one in which the tuning dial and shaft are integrally molded from a synthetic resin material in order to reduce manufacturing costs. Due to the method of removing the mold, cuts such as fitting grooves cannot be formed in the shaft by integral molding. Therefore, in such a tuning dial device, a plate material or the like is brought into contact with the side surface of the shaft from multiple directions, and a hemispherical protrusion is formed at the center of one end of the shaft, and the shaft is mounted on the pedestal with the protrusion. It is known that the device is rotatable by being supported by the device.

(c) Problems to be solved by the invention However, in the above-mentioned tuning dial device, since the shaft is supported at one point on the pedestal, the tuning dial may swing when the turning operation is performed, or the shaft may Depending on the direction of operation, the force generated when turning the tuning dial may cause the shaft to rise from the base due to the height relationship between the winding position and the sending-out position of the dial thread wound on the dial. The operating feel was poor.

(d) Means for Solving the Problems The present invention aims to provide a tuning dial device that is constructed in view of the above-mentioned points. A recess is formed in a central portion surrounded by the protrusion, and the shaft is supported on the pedestal by the protrusion, and an air chamber is formed between the protrusion and the pedestal by the recess.

(E) Function The present invention supports the shaft of the tuning dial in an annular manner on a pedestal, and forms an air chamber between the contact end of the shaft and the pedestal to generate suction force, thereby making it easier to rotate the shaft. This is to ensure the stability of the tuning dial while maintaining the same height, and to suppress the floating force generated due to the difference in height between the winding position of the dial thread on the shaft and the sending-off position.

(f) Example Figures 1 and 2 are both examples of the present invention.
These are partial cross-sectional views from the side and back, respectively, where 1 is a tuning dial for performing tuning operation of the tuner, and 3 is the tuning dial 1.
3 is a pedestal on which the shaft 2 is placed; 4 constitutes the front surface of the tuner housing, and the pedestal 3 and the tuning dial 1
This is a front panel in which a hole 5 is formed to allow a portion of the front panel to protrude to the outside of the housing. The tuning dial 1 and the shaft 2 are integrally molded from a synthetic resin material, and the tuning dial 1 has a disc shape with anti-slip teeth formed on the outer periphery. It has a cylindrical shape with a thread hooking portion 2a whose diameter gradually decreases toward the center. A dial thread 6 is wound around the thread hook 2a of the shaft 2. A dial thread 6 has a fixed pointer (not shown) indicating the reception frequency displayed on the front panel 4. Further, the shaft 2
An annular protrusion 7 is formed at the end in contact with the pedestal 3, and a recess 8 is formed in the central portion surrounded by the protrusion 7. The projection 7 is in contact with the pedestal 3, and the contact surface thereof is coated with grease, and an air chamber is formed between the projection 7 and the pedestal 3.

By the way, from the back side of the front panel 4, in addition to the pedestal 3, there are tongues 9 and 10 formed with notches for gripping the shaft 2, and a boss having a threaded hole 11a. 11 is provided, and by screwing a plate body 12 to the boss 11 from the rear with screws 13, the shaft 2 is supported in contact with the side surfaces from multiple directions.
Further, upward movement of the tuning dial 1 is restricted by a hook-like projection 14 formed above the hole 5 of the front panel 4.

Now, when the tuning dial 1 of the tuning dial device configured as described above is rotated, the shaft 2 integrally formed with the tuning dial 1 is rotated in accordance with the rotation direction of the tuning dial 1. do. Here, the shaft 2
is supported in an annular shape on the pedestal 3, so that the shaft 2 can easily rotate even if there is a gap between the shaft 2 and the tongue pieces 9 and 10 or the plate 12. The stability of shaft 2 is ensured, and the ease of rotation of shaft 2 is not impaired.

By the way, when the tuning dial 1 is rotated so that the dial thread 6 moves in the direction of arrow A, the feeding position becomes lower than the winding position of the dial thread 6 onto the shaft 2. The dial thread 6 slips downward. Therefore, due to the reaction, the shaft 2
A force is generated that tries to float upward. However, due to the air chamber formed by the concave portion 8 of the shaft 2, an adsorption force is generated in the opposite direction to the levitation force in addition to gravity, so that the shaft 2 and the tuning dial 1 are forced upwardly. Levitation is prevented. If an external force is applied and the levitation force exceeds the combined force of the gravity and attraction force, the shaft 2 and the tuning dial 1
is floated, but the floatation is limited by the contact between the hook-shaped projection 14 and the upper surface of the tuning dial 1, so that the floatation is only slight.

(g) Effects of the invention As described above, according to the invention, the shaft of the tuning dial is annularly supported on the pedestal, and an air chamber is formed between the contact end of the shaft and the pedestal to increase suction force. This allows the stability of the tuning dial to be ensured without compromising the ease of rotation of the shaft, and also reduces the levitation force generated by the difference in height between the winding position of the dial thread onto the shaft and the sending-off position. It is possible to provide a tuning dial device which can suppress the noise and has a good operational feeling.

[Brief explanation of drawings]

Both FIG. 1 and FIG. 2 are examples of the present invention.
FIG. 3 is a partial cross-sectional view from the side and the back, respectively. Explanation of main figure numbers, 1... Tuning dial, 2... Shaft, 3... Pedestal, 4... Front panel, 6... Dial thread, 7... Protrusion, 8...
...concavity.

Claims (1)

[Scope of utility model registration request] In a tuning dial device in which a shaft on which a dial thread is wound is rotated on a pedestal by rotating a tuning dial to move a pointer that displays a received frequency, the end of the shaft in contact with the pedestal is An annular projection is formed and a recess is formed in a central portion surrounded by the projection, the shaft is supported on the pedestal by the projection, and an air chamber is formed between the projection and the pedestal by the recess. A tuning dial device characterized by: