JPS5813624Y2 - Synchronized shaft crimping mechanism - Google Patents

Description

[Detailed description of the invention] The present invention relates to a clutch for a push-button tuner. In particular, in a clutch that transmits rotational force by pressing a clutch plate and a tuning shaft, the tuning shaft is pressed against the clutch plate, and the tuning shaft is pressed against the clutch plate. This relates to a mechanism that prevents the shaft from rattling.

Push-button tuners are widely used in car radios, and are equipped with multiple push buttons. By pushing the push buttons, a rotating crank is rotated, and the core connected to the rotating crank is turned into a coil. It is configured to synchronize by advancing and retreating.

The rotating crank is also connected to a tuning knob at the same time, and is configured to rotate the tuning knob to perform tuning and set a desired frequency for each push button.

However, when operating a push button, if the rotary crank and the synchronizing knob are connected to each other, the load will become large and smooth button press operation cannot be expected. A clutch is provided to lighten the load by disengaging the clutch when the push button is operated.

By the way, as one of this type of clutches, there is one as shown in Fig. 1.2.

In this clutch, a U-shaped bracket 2 is fixed to the side of a frame 1, and a clutch shaft 4 is supported within a gear sleeve 3, which is fixed to the U-shaped bracket 2 by caulking.

A clutch gear 4' that interlocks with the rotating crank is provided at the end of the clutch shaft 4 on the frame side, and a clutch plate 5 is provided on the opposite side.

A friction member 7 provided at the tip of the tuning shaft 6 is pressed into contact with the clutch plate 5, and the rotation on the side of the tuning shaft 6 is transmitted to the clutch plate 5.

That is, the movable sleeve 8 is fitted into the outer periphery of the gear sleeve 3, and the crimping disc 9 provided on the movable sleeve 8 is inserted into the outer circumference of the gear sleeve 3.
As a result of being pressed by the compression spring 10, the friction member 7 engaged with the compression disc 9 is pressed against the clutch plate 5.

Further, a clutch lever 11 is engaged with the movable sleeve 3, and the clutch lever 11 is moved by the kick arm 12.
By rotating the compression spring 10 by
The crimping disc 9 is moved against the pressure, thereby breaking contact between the clutch plate 5 and the friction member 7 and disengaging the clutch.

On the other hand, in this type of clutch, in order to prevent the synchronizing shaft 6 from rattling on the bearing part 13 of the bracket 2,
It is necessary to tension the coil spring 14 between the tuning shaft 6 and the lower part of the bracket 2.

That is, since the tuning shaft 6 moves on the bearing portion 13 as the clutch is engaged and engaged, if it is not constantly pulled by the coil spring 14, looseness will occur.

However, as described above, the separate provision of a mechanism for crimping the tuning shaft and the clutch plate and a mechanism for preventing rattling of the tuning shaft has the drawback of increasing the number of parts and assembly man-hours.

In particular, the above-mentioned clutch requires the provision of various members on the clutch shaft, such as a movable sleeve, a crimping disk, and a crimping spring, for crimping the synchronizing shaft to the clutch plate. It was extremely complicated.

The present invention was proposed in view of the above points, and its purpose is to simplify the overall structure of the clutch by combining the compression spring of the synchronizing shaft with the spring for preventing backlash. The purpose of the present invention is to provide a crimping mechanism for synchronized shafts.

Proceeding to the third to third clutches employing an embodiment of the present invention,
This will be explained in detail with reference to FIG.

That is, in the clutch of this embodiment, the frame 31
A U-shaped bracket 32 is fixed to the side of the U-shaped bracket 32, and a clutch shaft 33 is supported by both left and right sides of the U-shaped bracket 32.One end of the clutch shaft 33 is connected to a rotating crank and has a tough latch gear 34. A clutch plate 35 is fixed to the other end.

A tuning shaft 36 is disposed perpendicular to the clutch shaft 33, and the tuning shaft 36 is pressed by a torsion coil spring 37 provided between the tuning shaft 36 and the U-shaped bracket 32, and the friction member 40 at the tip thereof is pressed. It is pressed against the clutch plate 35.

A tongue piece 39 provided on a kick arm 38 that interlocks with the push button is engaged with the bent tuning shaft 36.

In this type of clutch mechanism, when selecting a channel by tuning, the tuning shaft 3 is pressed by the torsion coil spring 37.
6 is in pressure contact with the clutch plate 35, the rotation of the synchronized shaft side is transmitted to the clutch plate 35 by the frictional force between the two, which rotates the clutch gear 34 via the clutch shaft 33, and is engaged with the clutch gear 34. The rotational force from the synchronized shaft is transmitted to the rotating crank.

On the other hand, when selecting a channel using the push button, the kick arm 38 rotates in conjunction with the push button, and the tongue piece 39 formed on the kick arm 38 moves onto the tuning shaft 3.
6 is torsionally pulled against the force of the coil spring 37 to break contact between the synchronizing shaft tip and the clutch plate 35.

Therefore, the clutch shaft 33 can freely rotate without being restricted by the synchronizing housing or the synchronizing shaft, and the rotating crank connected thereto also rotates smoothly.

According to the present invention, a torsion coil spring 31 that presses the tuning shaft 36 is attached as shown in FIG.

That is, the pressing force F of this spring 37 is: (1) a clutch pressure load f1 that presses the tuning shaft 36 horizontally toward the clutch plate; and (2) a bearing portion 41 in which the tuning shaft 36 is mounted on a U-shaped bracket.
with a backlash prevention load f2 that presses vertically toward the lower side of the
The spring 37 is compressed between the U-shaped bracket 32 and the tuning shaft 36 so that it is decomposed into component forces in two directions.

With this configuration, the tuning shaft 36 is pressed toward the clutch plate 35 side by the - number of springs 37, and at the same time is also pressed against the lower side of the bearing portion 41 of the U-shaped bracket 32, so that the tuning shaft 36 is pressed against the clutch plate 35 side. Both purposes of transmitting rotational force to the plate and preventing rattling of the tuning shaft are achieved at the same time.

Incidentally, the spring that presses this tuning shaft 36 is not limited to a torsion coil spring (torsion spring) as shown in FIG. 3.4, but a coil spring 37a as shown in FIG. 5 may also be used.

In this case, so that the tractive force F of the coil spring 37a is decomposed into a clutch pressure load f1 and a backlash prevention load f2,
It is assumed that the coil spring 37a is installed diagonally.

As shown in the above embodiments, the crimping mechanism of the present invention is configured so that a single spring is used to press the synchronizing shaft against both the clutch plate side and the bearing part, so that Compared to a structure in which each spring is provided with its own dedicated spring, the structure is simpler, and the number of parts and assembly steps can be reduced.

Particularly, according to the present invention, there is no pressure spring on the clutch shaft, and accordingly, there is no need for a moving sleeve or a pressure disk, so there is an advantage that the overall structure of the clutch is significantly simplified.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a clutch equipped with a conventional synchronizing shaft crimping mechanism, Fig. 2 is a perspective view of the same as above, Fig. 3 is a plan view of a clutch equipped with a crimping mechanism of the present invention, and Fig. 4 is a sectional view of the clutch equipped with a crimping mechanism of the present invention. FIG. 5 is a front view showing an example of the crimping mechanism of the invention, and FIG. 5 is a front view showing another example of the same. 31... Frame, 32... U-shaped bracket, 33... Clutch shaft, 34...
...Clutch gear, 35...Clutch plate, 36
.....Synchronization shaft, 37.....-Torsional coil spring, 37a..... Coil spring, 38..... Kick arm, 39..... Tongue piece, 40..・・・・・・
Friction member, 41...Bearing section.

Claims (1)

[Scope of utility model registration request] The tuning shaft is pressed into contact with the clutch plate to transmit rotational force, and the tuning shaft is moved along its bearing to break contact with the clutch plate. A crimping mechanism for a synchronized shaft, characterized in that a spring is attached to the synchronized shaft, and the spring has a force that can be divided into a clutch crimped load that presses the shaft against the clutch plate and an anti-backlash load that presses the synchronized shaft against the bearing part. .