JPS6134759Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bearing mechanism for a clutch shaft in a push button tuner.

The push-button tuner includes a plurality of push buttons, and is configured so that by pushing the push buttons, a rotary crank is rotated, and a core connected to the rotary crank is moved forward and backward into the coil to perform tuning. ing. The rotating crank is also connected at the same time to a tuning knob, which performs tuning.
It is configured such that a desired frequency can be set for each push button. However, if the rotation crank and tuning knob are left connected when operating the push button,
Since the load becomes large and smooth button push operation cannot be expected, a clutch mechanism is provided between the rotary crank and the synchronization knob, and the clutch is disengaged when the push button is operated to lighten the load.

As shown in FIG. 1, a conventionally known clutch mechanism is one in which a sleeve 2 is fixed to the side surface of a frame 1 of a tuner by caulking, and a clutch shaft 3 is inserted into this sleeve 2. This is what I did. A gear 4 interlocked with a rotating crank (not shown) is fixed to one end of the clutch shaft 3 (the inner end of the frame 1), and a clutch plate 5 is fixed to the other end. Further, a sleeve 6 is movably fitted onto the outer periphery of the clutch shaft 3, and a crown gear 7 and a clutch lever 8, which are interlocked with the tuning knob, are attached to the movable sleeve 6.
Therefore, this conventional clutch mechanism
A spring 9 compressed between the clutch lever 8 (moving sleeve 6) presses the crown gear 7 against the clutch plate 5, thereby transmitting the rotational force on the synchronizing knob side to the rotating crank; When not transmitting the information (when selecting a channel using a push button), the movable sleeve 6 is moved against the spring 9 by a clutch lever 8 that is linked to the push button.
This is to cut off contact between the crown gear 7 and the clutch plate 5.

However, in such a conventional clutch mechanism, the presence of the sleeve 2 for supporting the clutch shaft 3 is essential, and the number of parts is accordingly large.
The disadvantage was that the structure was complicated. In particular, when fixing the sleeve 2 to the frame 1, there was a drawback in that it required a time-consuming and troublesome operation of caulking. In addition, in this conventional type, the sleeve 2 is fixed to the frame 1 in a cantilevered manner, so
During assembly, the mounting angle of the sleeve tends to be incorrect, making it difficult to obtain a product with high assembly accuracy.

This invention was proposed to solve the above-mentioned drawbacks of the conventional clutch mechanism.The purpose of this invention is to fix a U-shaped fork bracket to the side of the frame, and to connect the clutch gear to both the left and right sides of the fork bracket. An object of the present invention is to provide a bearing mechanism that can reliably support a clutch shaft without using a sleeve.

Next, an example of a clutch employing the bearing mechanism of the present invention will be explained in detail with reference to FIGS. 2 and 3.

In the figure, reference numeral 11 is a frame, and 12 is a U-shaped fork bracket that is integrally molded by pressing, and this fork bracket 12 is screwed onto one side of the fork bracket and fixed to the side surface of the frame 11 with a screw. A bearing hole 13 with one end constricted into a V-shape is formed on one side of the U-shaped fork bracket 12 on the frame 11 side, and a bearing hole 14 consisting of a normal circular hole is formed on the opposite side. ing. A large clutch shaft insertion hole 15 is formed in the side surface of the frame 11 in correspondence with the V-shaped bearing hole 13 of the bracket.

16 is a clutch shaft, and a clutch gear 17 is fixed to the end of the clutch shaft 16 on the frame side, and a clutch plate 18 is fixed to the opposite side. This clutch shaft 16 is supported by two sides of the fork bracket 12. That is, the clutch shaft 16 has a portion close to the clutch gear 17 that is connected to the V of the fork bracket 12.
It is supported by a shaped bearing hole 13. In this case, the clutch shaft 16 can be pressed against the narrowed part of the V-shaped bearing hole 13 (the tip of the V-shape) using a sector gear of a rotary crank meshed with the clutch gear 17 or a separately provided spring. Due to this, the V-shaped bearing hole 13
This prevents the clutch shaft 16 from rattling inside. On the other hand, the opposite end of the clutch shaft 16 is supported by a circular bearing hole 14 bored in the opposite side of the fork bracket 12. In this case, a tapered portion 19 is formed on the clutch shaft 16, and this portion of the tapered portion 19 is fitted into the bearing hole 14 to form a tapered bearing.

20 is a tuning shaft, and the base end of this tuning shaft 20 is connected to a tuning knob via a universal joint. On the other hand, the tip of the tuning shaft 20 is inserted into the U-shaped fork bracket 12 through a bearing hole 21 opened in the front surface thereof.
A drum-shaped friction member 22 made of polyurethane elastomer, synthetic rubber, or other plastic is fixed to the tip thereof, and the friction member 22 is in contact with the clutch plate 18. The tuning shaft 20 is supported at the lower side of the front bearing hole 21 of the bracket 12 so as to be movable laterally. A torsion coil spring 23 is disposed on the front surface of the bracket 12 and has one end engaged with the bracket 12 and the other end engaged with the tuning shaft 20.
As a result, the tuning shaft 20 is pressed toward the clutch plate 18. That is, the clutch plate 18 is attached to this spring 23.
When the clutch shaft 16 is pressed, the clutch shaft 16 is also pressed toward the circular bearing hole 14 of the fork bracket 12, and the tapered portion 19 and the circular bearing hole 14 are fitted without any gap.

A kick arm 2 is attached to the front side of the inside of the frame 11.
4 are arranged. This kick arm 24 is
It is attached to the frame 11 by fitting the fulcrum 26 into a bearing hole 25 provided in the frame 11. A part of a channel selection push button is in contact with the inside part of the frame 11 of this kick arm 24, so that when the push button is pressed, this kick arm 24 rotates back and forth about a fulcrum 26. It's getting old. Further, a coil spring 27 is stretched between the upper part of the kick arm 24 and the frame 11, and the coil spring 27 causes the kick arm 24, which is pressed by the push button and rotated, to return to its old state. A tuning shaft 20 is attached to the end of the kick arm 24.
a U-shaped groove 28 large enough to allow entry of the tuning shaft 20;
A tongue piece 29 is formed which engages with the outside. A tapered portion 30 is formed at the tip of the tongue piece 29, and the tuning shaft 20 slides along this tapered portion 30.

An example of a clutch employing the bearing mechanism of the present invention has the structure described above, and its operation will be explained next.

First, when selecting a channel using the tuning knob, the kick arm 24 is not rotating, and the tuning shaft 20 is not pulled by the kick arm. Therefore, the tuning shaft 20 is pressed by the torsion coil spring 23, and the friction member 22 at the tip is in pressure contact with the clutch plate 18. Therefore, when the tuning knob is rotated, the rotational force is applied to the tuning shaft 20, the friction member 22, and the clutch plate 1.
8 and the clutch shaft 16, and the clutch gear 17 rotates. As a result, the fan-shaped gear and rotating crank engaged therewith rotate, and the core moves forward and backward within the coil. If the clutch shaft rattles when the clutch is connected, the rotation of the synchronized shaft will not be smoothly transmitted to the core entering the coil.
This may cause problems such as frequency deviation, but in this invention,
When the clutch is connected, the clutch shaft is always pressed by the torsion coil spring 18, and the tapered portion at the end of the clutch shaft is press-fitted into the circular bearing hole of the fork bracket, so there is no risk of rattling of the clutch shaft. effective.

On the other hand, when selecting a channel using the push button, when you press the push button,
Pressed by this, the kick arm 24 rotates about the fulcrum 26. Then, the kick arm 24
The tongue piece 29 formed at the end of the plate also rises. Tongue piece 29
Since the tuning shaft 20 is engaged with the tip of the tongue 29, the tuning shaft 20 moves along the tapered portion 30 of the tongue piece 29 and enters the U-shaped groove 28. As a result, the tuning shaft 20 moves laterally on the lower side of the front bearing hole 21 of the U-shaped bracket 12 against the pressing force of the torsion coil spring 23.
0 and the clutch plate 18 is released. Therefore, the clutch plate 18, the clutch shaft 16, and the clutch gear 17 can rotate independently of the tuning shaft 20, so that the core is moved back and forth into the coil by the rotating crank pressed by the push button. At this time, the rotational force of the rotating crank is not transmitted to the tuning knob side. In particular, when the clutch is disengaged, the pressing force on the clutch shaft is released, no load is applied to the clutch shaft, and the clutch shaft can be rotated with a light force when selecting a channel using the push button, improving operability. This makes it possible to obtain a push button tuner with good performance.

As shown in the above embodiments, the bearing mechanism of the present invention supports the clutch shaft by the two sides of the U-shaped fork bracket fixed to the side of the frame. is no longer necessary, making it possible to reduce the number of parts and simplify assembly man-hours. Furthermore, since the clutch shaft is supported at two points, the present invention has the advantage that the clutch shaft can be supported reliably and its mounting precision can be improved. In particular, since one of the clutch shafts is a tapered bearing and the other is a V-shaped bearing, rattling of the clutch shaft can be completely prevented. Furthermore, according to the present invention, it is possible to connect the clutch and prevent rattling of the bearing with a single spring, and it is possible to obtain a high-performance push button tuner with a simple structure and a reduction in the number of parts. There are advantages.

As described above, according to the bearing mechanism of the present invention, the structure can be simplified because the force of the torsion coil spring that presses the friction member against the clutch plate is directly used to prevent rattling of the clutch shaft.

By bringing the torsion coil spring into direct contact with the tuning shaft, unnecessary members can be eliminated between the spring and the tuning shaft, simplifying the structure and improving assembly workability.

By installing a torsion coil spring on the front of the bracket, the workability of installing the spring can be improved.

This unique action and effect is exhibited.

Furthermore, when the bearing mechanism of the present invention is used in a clutch that moves the tuning shaft as shown in the figure, by forming a bearing hole for the tuning shaft in the front plate of the fork bracket, the clutch shaft and the tuning shaft can be moved with one bracket. It is also possible to use both bearings.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing an example of a conventional clutch;
FIG. 2 is a plan view showing an example of a clutch employing the bearing mechanism of the present invention, and FIG. 3 is a perspective view of the same. 11... Frame, 12... Fork bracket, 13... V-shaped bearing hole, 14... Circular bearing hole,
15...Clutch shaft insertion hole, 16...Clutch shaft, 17...Clutch gear, 18...Clutch plate, 19...Tapered portion, 20...Synchronizing shaft, 21
... Front bearing hole, 22 ... Friction member, 23 ... Torsion coil spring, 24 ... Kick arm, 25 ...
... Bearing hole, 26 ... Fulcrum, 27 ... Coil spring,
28...U-shaped groove, 29...tongue piece, 30...tapered portion.

Claims (1)

[Scope of Claim for Utility Model Registration] a. A fork bracket having a U-shape in plan is fixed to the side of the frame of the push button tuner; b. c) A circular bearing hole is formed on the opposite side of the fork bracket, and a tapered part formed at the opposite end of the clutch shaft is fitted into this circular bearing hole, and d) A circular bearing hole is formed on the opposite side of the fork bracket. A clutch plate is fixed, and a friction member at the tip of the tuning shaft inserted from the front side of the fork bracket into the fork bracket is brought into contact with the clutch plate surface, and one end of a torsion coil spring is engaged with the front side of the fork bracket. The other end of this torsion coil spring was directly engaged with the tuning shaft, the force of this torsion coil spring was transmitted in this order to the tuning shaft, the friction member, the clutch plate, and the clutch shaft, and the tapered part of the clutch shaft was press-fitted into the circular bearing hole. A clutch shaft bearing mechanism characterized by: