JPS584335Y2 - Tuner fine adjustment device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a holding structure for a gear body used in a fine adjustment device for a preset tuner, and aims to reduce costs, improve workability, and improve performance.

FIGS. 1A to 1C show the relationship between a gear body and a slide body conventionally used in a tuner fine adjustment device, and these will be explained first.

In FIG. 1A, the first gear 1 and the shaft portion 2 are integrally molded, and the shaft portion 2 is fitted into a hole 6 formed in a slide body 5 attached to the side wall 4 of the tuner case. A second gear 3 is fitted and welded to the tip.

The first gear 1 is a gear that transmits rotation to the fine adjustment screw,
The second gear 3 is a gear that receives rotation from the fine adjustment gear.

Further, the slide body 5 is attached to the tuner case side wall 4 so as to be slidable in the direction of the wall surface.

FIG. 1B has substantially the same configuration as FIG. 1A.

The difference is that the retaining ring 7 is engaged with a groove 8 formed in the shaft portion 2 to integrate the first gear 1, the shaft portion 2, and the second gear 3.

These gears are integrated after each gear is fitted into a hole drilled in the slide body, and the number of parts and work processes are complicated. The one shown in Figure 1C was considered.

In FIG. 1C, the first gear 1 transmits rotation to the fine adjustment screw.
A gear body, in which the second gear 3 and the shaft portion 2 which receive rotation from the fine adjustment gear are integrally molded, is fitted into a hole 6 drilled in a slide body 5 attached to the side wall 4 of the tuner case, and the shaft portion It is shown that it is locked to the slide body 5 by an elastic protrusion 9 formed on the portion 2.

When the gear body is fitted into the hole 6 of the slide body 5, the elastic protrusion 9 penetrates the second gear 3 and penetrates into the hole 10 near the first gear 1, so that the fitting is not completed completely. It is constructed so that it will return to its original shape when finished.

In this way, compared to FIGS. 1A and 1B, the gear body shown in FIG. They are fitted together and locked using elastic protrusions provided on the shaft, and although the number of parts is small and the workability is good, it has the following drawbacks.

Considering the manufacturing of the gear body shown in FIG. 1C from the mold manufacturing stage, a larger number of molds are required than the molds for manufacturing the gear body according to the present invention, which will be described later.

That is, one mold for molding the first gear 1, one mold for molding the second gear 3 and the hole 10 of the shaft portion 2, and two molds for molding the outer peripheral surface of the shaft portion 2 and the elastic protrusion 7. A mold is required.

The outer peripheral surface of the shaft portion 2 and the elastic protrusion 9 are molded using a mold consisting of a part for molding the first gear 1 and a part for molding the outer peripheral surface of the shaft part 2 facing the projection 9. In some cases, this is done using a mold that molds the side on which it is located.

Therefore, at least three molds are required.

Having a large number of molds means that there are many parts where different molds come into contact with each other, and the number of cracks that occur at the contact parts also increases.

For example, if the above-mentioned mold is used, the shaft part 2 that fits into the hole 6 of the slide body 5 is made to have a hole in the axial direction of the shaft part 2 at the part where the molds for molding the shaft part 2 come into contact with each other. This creates an obstacle to smooth fitting.

Next, the tuner fine adjustment device according to the present invention will be explained with reference to FIGS. 2 to 4.

FIG. 2 is a partial cross-sectional view of the tuner fine adjustment device and a portion of the tuner body according to the present invention.

The tuner body includes an oscillation desk 14 integrally formed with a cylindrical protrusion around which an oscillation coil 13 is located on the opposite side of the fine adjustment device with the tuner case 4 as a boundary, a ratchet plate 15 that fits with the cylindrical protrusion, and one end. The fine adjustment screw 16 and other parts (
(not shown).

The fine adjustment screw 16 has a small gear at one end that moves back and forth inside the coil 13 to change the inductance by meshing with a first gear 1 of a gear body to be described later.

The oscillation desk 14 and ratchet plate 15 are configured to rotate integrally with the coarse adjustment shaft 17.

A fine adjustment shaft 18 is provided on the side of the coarse adjustment shaft 17 that faces the tuner body.
and the fine adjustment gear 19 are fitted.

The fine adjustment shaft 18 and the fine adjustment gear 19 are slidable with a certain stroke in the axial direction, and can freely rotate with respect to the coarse adjustment shaft 17.

However, both are normally urged by a spring 20 in the direction of a stop shaft 21 provided on the coarse adjustment shaft 17.

When the fine adjustment shaft 18 is pressed in the direction of the spring 20, the fine adjustment gear 19
is pressed through the contact portion with the fine adjustment shaft 18, and the taper portion 22 used on the spring side comes into contact with the circumferential surface of the coarse adjustment shaft through hole 23 of the slide body 5, causing the entire slide body 5 to move in the direction of arrow A. move in the direction of.

In this state, the gear portion of the fine adjustment gear 19 meshes with the second gear 3 of the gear body, and the gear of the fine adjustment screw 16 meshes with the first gear 1.

Therefore, when the fine adjustment shaft 18 is rotated in this state, the rotation is transmitted to the fine adjustment screw and fine adjustment is performed.

When the fine adjustment is completed, the fine adjustment shaft 18 and the fine adjustment gear 19 are urged toward the stop shaft 21 by the spring 20, and the slide body 5 is urged in the opposite direction of arrow A by the spring (not shown), so that each gear The interlocking is removed.

Next, the slide body 5 and the gear body will be briefly explained.

The slide body 5 is attached to the tuner case side wall 4 so as to be slidable only in the direction of arrow A and the opposite direction.

The gear body is latched to the slide body 5 by a thin plate-shaped elastic protrusion 11 provided diagonally on the shaft portion 2 connecting the first gear 1 and the second gear 3, so that the fine adjustment axis can be adjusted to a predetermined position. It serves to transmit the rotation to the fine adjustment screw 16 by the operation of.

FIG. 3 is a perspective view showing a gear body used in the fine adjustment device according to the present invention.

A first gear 1 that transmits rotation to the fine adjustment screw and a second gear 3 that receives rotation from the fine adjustment gear are integrally molded together with a shaft portion 2, and the second gear 3 is passed through the outer peripheral surface of the shaft portion 2. hole 24
Accordingly, a long groove 12 is provided near the first gear 1 in which an elastic protrusion 11 that is provided obliquely extends and retracts.

The diameter of the shaft portion 2 is slightly larger than (or may be the same as) the outer diameter of the first gear 1.

Such a gear body includes one mold for molding the first gear 1 and the outer peripheral surface of the shaft portion 2, and one mold for molding the second gear 3 and the long groove 12 of the shaft portion 2. It is integrally molded using

Here, the hole 24 passing through the gear 3 is connected to the second gear 3 and the shaft portion 2.
It is formed by removing the part of the mold for forming the long groove section 12 of the mold.

At this time, the elastic projecting piece 11 is also formed into an inclined thin plate shape using both molds.

The bottom surface of the long groove 12 is provided at a position where the elastic protrusion 11 will not be recessed beyond a certain level.

FIG. 4 is a sectional view showing the gear body shown in FIG. 3 fitted into a hole 6 formed in a slide body 5 attached to a side wall 4 of the tuner case.

On the side of the slide body 5 where the first gear 1 is located, there is a stepped portion 2 between the hole 6 and a hole 25 having a diameter slightly larger than the hole 6.
6 is formed, and the tip of the elastic protrusion 11 comes into contact with the stepped portion, thereby locking the gear body.

The locking of the gear body does not necessarily have to be done by configuring the stepped portion 26 as described above, but the meaning of doing so is to prevent the gear body from being forcibly pulled out in the direction opposite to the insertion direction. The point is that the elastic protrusion 11 is protected when the elastic protrusion 11 is activated.

As described above, the present invention has a gear body in which a first gear and a second gear are integrally molded together with a shaft between the gears, and the gear body is fitted into a hole drilled in a slide body attached to a side wall of a tuner case. In a fine adjustment device for a tuner, the diameter of the shaft portion is set to be equal to or larger than the outer diameter of the first gear, and a long groove provided on the outer peripheral surface of the shaft portion is installed obliquely in the vicinity of the first gear. The gear body is fitted into the hole from the first gear side, and the elastic protrusion is inserted into the hole. It is fixed to the stepped part of the holder and has the following features.

First, a minimum number of molds are required to mold the gear body.

Therefore, mold management costs can be reduced.

In addition, it is possible to minimize the occurrence of cracks on the contact surfaces between the molds.

Furthermore, in conventional gear bodies that are integrally molded, it was not possible to avoid the burrs that protrude in the axial direction on the outer peripheral surface of the shaft, but in the gear body of the present invention, the burrs are formed in the direction along the outer surface of the shaft. Since it can be configured so that the sliding body can be rotated, it can be easily fitted to the slide body, and rotation after fitting can be performed smoothly.

Second, compared to the conventional example, since a long groove is formed on the outer periphery of the shaft, by inserting grease into the long groove, the gear body can be kept smoothly rotating for a long time.

Further, the bottom surface of the long groove is provided at a position where the elastic protrusion does not sink in beyond a certain level, thereby protecting the elastic protrusion.

Thirdly, because the shape of the hole drilled in the slide body is configured to provide a stepped portion on which the tip of the thin plate-shaped elastic protrusion installed diagonally comes into contact, the elastic protrusion is normally installed in the hole of the slide body. When a force opposite to the insertion direction of the gear body is applied, the elastic protrusion deforms, and the tip of the elastic protrusion is inserted into the large diameter hole from the step. Since it slides into contact with the side surface and stops, and deformation exceeding a predetermined deformation is restricted, it has the advantage of preventing deformation and destruction in response to the applied force as in the conventional example.

[Brief explanation of the drawing]

FIGS. 1A to 1C are cross-sectional views showing gear bodies used in conventional tuner fine adjustment devices. FIG. 2 is a sectional view showing the tuner fine adjustment device and a part of the tuner main body according to the present invention. FIG. 3 is a perspective view showing a gear body used in the present invention, and FIG. 4 is a sectional view of the gear body shown in FIG. 3 attached to a slide body. 1...First gear, 2...Shaft portion, 3.
... Second gear, 4 ... Tuner case side wall, 5 ... Slide body, 6 ... Hole,
7...Retaining ring, 8...Groove, 9...
...Elastic protrusion, 10...hole, 11...
Elastic projecting piece, 12...long groove, 13...coil, 14...oscillation desk, 15...
Ratchet plate, 16...Fine adjustment screw, 17...
... Coarse adjustment axis, 18 ... Fine adjustment axis, 19 ...
...Fine adjustment gear, 20... Spring, 21...
・Retaining ring, 22... Taper part, 23...
... through hole, 24 ... hole, 25 ... hole, 26 ... step part.

Claims (1)

[Scope of utility model registration request] A tuner fine adjustment device that performs fine tuning by fitting a gear body made by integrally molding a first gear and a second gear together with a shaft between the gears into a hole drilled in a slide body attached to a side wall of a tuner case. , the diameter of the shaft portion is greater than or equal to the outer diameter of the first gear, and an elastic projection protruding obliquely in the vicinity of the first gear in a long groove provided on the outer peripheral surface of the shaft portion; and the slide body. The gear body is fitted into the hole from the first gear side and the elastic protrusion is locked to the step of the hole. Features a tuner fine adjustment device.