JPS5821227Y2 - Manual tuning transmission mechanism in push-button tuner - Google Patents

Description

[Detailed description of the invention] The present invention relates to a manual tuning transmission mechanism in a push-button tuner, and is particularly used in patent applications No. 043978 and No. 111342 filed in 1975 by the present applicant. This relates to an idea that is effective.

It is well known that push-button tuners have conventionally used both a push-button tuning mechanism that changes inductance by suppressing a push button, and a manual tuning mechanism that changes inductance by rotating a manual tuning shaft. .

In the above configuration, the position of the core moving in and out of the coil body is changed with respect to the coil body by pressing a push button or rotating a manual tuning shaft, and the position of the displaced core is maintained. A clutch mechanism is installed, but the outline of Patent Application No. 111342 filed in 1978 by the present applicant will be explained below.

Attach the lever board 2 to the picture frame side board 1, and attach the hook 4 of this lever board.
A coil spring 6 is stretched between the picture frame side plate 1 and the picture frame side plate 1, and a shaft 10 is screwed onto the shaft 8 of the rolling frame 7 which protrudes through the picture frame side plate 1 via a disk 9 so as to be integral with the shaft 8. However, one end of this shaft 10 is fitted into a long hole 3 bored in the lever plate.

The worm shaft 11 that is linked to the manual tuning shaft 31 has grooves 13.13a formed on both ends thereof, and a shaft bearing hole 17 and an elongated hole 1B formed in a pair of bent side plates 15 and 16 of the worm holder 14.
The plate spring 26 is inserted between the inner surface of the bent side plate 15 and the groove 13a in a loaded state (the worm shaft 1 is inserted in the direction of the bent side plate 16).
At the same time, the worm holder is attached to the picture frame side plate 1 with screws 27, and in this state, the worm 12 of the worm shaft 11 and the gear of the gear body 28 fitted into the shaft 8 29 is in mesh with the gear body 28.
The rotation of the worm shaft 11 is restricted, and the worm shaft 11 is inserted into a long hole 18 formed in the bent side plate 16 of the worm holder 14.
A coil spring 30 is stretched between the groove 13a on one end side and the bent side plate 16, and the worm is pressed into engagement with the gear 29.

The worm shaft 11 installed as described above is attached to the manual tuning shaft 31.
A gear body having a gear 29 that rotates in conjunction with the drive gear 32 fixed to one end of the manual tuning shaft and a driven gear 33 fixed to one end of the worm shaft 11 when the rotation operation is performed. A clutch lever support 34 integrally fixed to the clutch lever support 28 and a protrusion 35 at one end (35
a, 35b.

35 c t 35 d are collectively referred to as 35) fit into and engage with the latch lever support described above, and the notch 3 at the other end
6 (36a, 36b, 36Cj36d are collectively referred to as 36) are respectively attached to the clutch lever support 34 so as to surround the shaft 10. A disc 9 is interposed between the shaft 8 and the shaft 10.
A collar 38 is inserted into the shaft 10 so as to be in contact with one end of the clutch lever and located inside the lever plate 2 (on the side of the picture frame side plate 1), and the collar 38 is inserted through the lever plate 2 into this collar. By applying the load force of the coil spring 6, the protruding portion 35 of the clutch lever 37 acts in a direction away from the image frame side plate by lever action using the doglegged portion of the clutch lever 37 as a fulcrum. Due to this action, the clutch lever support 34 is drawn to the disk 9 and comes into pressure contact with the clutch lever support 34.
The clutch is clamped and fixed between the clutches 37 and 37 to maintain the clutch closed state.

Also, to explain the operation of the clutch mechanism with the above configuration,
When the push button 39 is moved forward in the direction of arrow P against the coil spring 40, the comb-shaped member 41 is moved against the shafts 43, 4 at both ends.
4 as an axis, and the L-shaped bent portion 42 provided at the lower position of one shaft 42 slides forward in contact with the cam portion 5 of the lever plate 2, so that the lever plate is attached to the picture frame side plate. The cam portion 5 tilts in a direction away from the picture frame side plate 1 against the coil spring 6 using the engaging portion 45 with the image frame side plate 1 as a fulcrum.

Due to this action, the pressing force on the clutch lever 37 is released through the collar 38 of the coil spring 6, and the clutch lever is no longer pressed against the disc 9, so that the shaft 8, which is integral with the rolling frame 7, is released. , the disc 9, and the shaft 10 become rotatable together by an external force, forcing the clutch to open, and the frequency regulating plate, which is restrained by the channel selection member having the push button 39, collides with the rolling frame 7, and this rotation occurs. The moving frame rotates until it follows the frequency regulating plate, and the core, which is pivoted to a slide plate (not shown) interlocking with the rolling frame 7, is displaced in the coil body,
Reproduces the frequency (inductance) stored in the frequency regulation plate.

Subsequently, when the pressing force on the push button 39 is released, the tuning member returns to its original position due to the repulsive force of the coil spring 40, and the load force of the coil spring 6 is applied to the clutch lever 37 via the lever plate 2 and the collar 38. As a result, the clutch lever support 34 is drawn to and pressed against the disc 9, and the disc 9 is pressed against the clutch lever 37 and the clutch lever support 34.
The clutch is clamped and fixed in between, and the clutch is in a closed state, and the rotation of the rolling frame is restricted, and the core position relative to the coil body is maintained.

Further, the effect of changing the inductance due to the rotational operation of the manual tuning shaft 31 is transmitted to the worm shaft 11 via the driving gear 32 and the driven gear 33, and the worm 12 formed on the worm shaft interlocks to rotate the gear body 28. .

Since the clutch mechanism in this state is in a closed state,
As the gear body rotates, the clutch lever support 34, which is fixed integrally with the gear body, also rotates, so the disc 9 held between the clutch lever support and the clutch lever 37 also rotates together. Therefore, the shaft 10, the shaft 8, and the rolling frame 7, which are integral with this disc, also rotate in conjunction with each other,
The core, which is pivotally fixed to the slide plate, is displaced within the coil body, and the inductance can be varied by a manual tuning mechanism.

The above is the variable inductance mechanism for a push-button tuner that was previously filed by the present applicant.

However, by rotating the manual tuning shaft 31, the drive gear 3
2 and a groove 13a on one end side of the worm shaft 11 which is inserted into the bearing hole 17 and the elongated hole 18 of the worm holder 14 which rotate in conjunction via a driven gear 33, and a hook 16a provided on the bent side plate 16 of the worm holder. The configuration in which the coil spring 30 is stretched between the worm shaft 11 and the bent side plate 15 of the worm holder 14 is because the annular protrusion 21 provided on the worm shaft 11 and the bent side plate 15 of the worm holder 14 are in surface contact. However, there was a problem that the worm 12 and the gear 29 were not stably engaged with each other.

Therefore, the present invention has been devised to solve the above-mentioned problems and to achieve a stable press-contact state in which the worm properly meshes with the gear, and will be explained below based on the drawings.

As shown in FIG. 3, the worm holder 14 is a U-shaped plate in cross section, comprising a main body 24 and a pair of bent side plates 15 and 16. The bent side plate 15 has a bearing hole 17, and the other bent side plate 16 is provided with a long hole 1B in the length direction of the bent side plate, and reference numerals 19 and 20 are between the main body portion 24 and the bent side plate 1.
5.16 This is a set screw hook bent perpendicularly to 16, and this hook has holes 22° and 23 for attaching a screw 2T.
Although it is similar to Patent Application No. 111342, the present invention further includes an elongated hole 18 on one side of the bearing hole 17 through which the worm shaft 11 of the bent side plate 15 of the worm holder 14 is inserted, which is perpendicular to the worm shaft. A rib 25 having an arcuate cross section is formed in a direction perpendicular to the annular protrusion 21 of the worm shaft 11,
The worm shaft 11 is inserted into the bearing hole 17 and the elongated hole 18, and the leaf spring 26 is fitted between the groove 13 and the bent side plate 15 in a loaded state, and the worm holder 14 is attached to the picture frame side plate 1 with the screw 2.
7, and a groove 13 on one end side of the worm shaft 11.
A coil spring 30 is stretched between the hook 16a and the hook 16a provided on the bent side plate 16.

That is, in the present invention, the annular protrusion 21 of the worm shaft 11 is
As shown in the figure, the worm shaft 11 is mounted in point contact with the apex of a rib 25 having an arcuate cross section, which is formed so as to protrude from one side of the shaft bearing hole 17 formed in the bent side plate 15. Since the worm 12 is freely rotatable downward using the rib as a fulcrum against the biasing force of the leaf spring 26 by the coil spring 30, the worm 12 is always in a press-fitted state with the gear 29, and the worm shaft 11 is rotated by the rotation operation of the manual tuning shaft 31. As for the interlocking rotation of the rolling frame 7 via the gear body 28, as mentioned above, the worm 12 is always in pressure contact with the gear 29, so that extremely accurate rotation transmission without backlash can be obtained, which is practical. This is a useful idea.

[Brief explanation of drawings]

1 to 4 show embodiments of the present invention; FIG. 1 is a partially cutaway plan view of a push-button tuner; FIG. 2 is an exploded perspective view of the main parts of the manual tuning transmission mechanism shown in FIG. 1; FIG. 3 is a perspective view of the worm holder, FIG. 4 is a side view showing the state in which the worm holder and worm shaft are attached, and FIG. 5 is a perspective view of the worm holder in a conventional embodiment. In the figure, 1 is a picture frame side plate, 2 is a lever plate, 7 is a rolling frame, 8 and 10 are shafts, 9 is a disc, 11 is a worm shaft, 12 is a worm, 13 and 13a are grooves, 14 is a worm holder, 15.16 is a bent side plate, 17 is a bearing hole, 18 is a long hole,
21 is an annular projection, 25 is an arcuate rib, 29 is a gear, 3
1 is a manual tuning shaft, 32 is a driving gear, and 33 is a driven gear.

Claims (1)

[Scope of utility model registration request] The rotation of the manual synchronization shaft 31 transmits a signal to the worm rotation 11 via the gears 32 and 33, and the worm 12 formed on the worm shaft rotates the gear 29, thereby connecting the clutch lever support 34 and the disk 9. through shaft 10 and shaft 8
In a manual tuning transmission mechanism in a push button type tuner, which rotates the rolling frame 7 connected to the shaft 8 and displaces the core moving in and out of the coil body to change the inductance. , a shaft bearing hole 17 through which the worm shaft is inserted and a long hole 18 are bored in the worm holder 14, and a shaft bearing hole 17 and a long hole 18 are formed in the worm holder 14, and a shaft of the worm shaft is formed in a direction perpendicular to the worm shaft 11 and perpendicular to the long hole on one side of the shaft bearing hole. A manual tuning transmission mechanism in a push button type tuner, characterized in that a rib 25 having an arcuate cross section is formed with which an annular protrusion 21 abuts.