JPH0246108Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a dial device used in a tuner or the like, that is, a driving device for a variable capacitor (hereinafter referred to as a variable capacitor) and a pointer.

[Prior art and its problems]

Conventionally, such dial devices include a threading type as shown in FIG. 3 and a gear type as shown in FIG.

In FIG. 3 (almost a plan view), 31 is a variable capacitor, 32 is a pulley pivotally supported by the variable capacitor 31, and 3
3 is a thread drive shaft, 36 is a tuning knob, 35
is a flywheel, and by turning the tuning knob 36 left and right, a pointer 37 attached to the middle of the dial thread 38 wound around the pulley 32 moves left and right via a pulley 34 to support the tuning position. do. In addition, 39 is a variable capacitor 31
is a substrate on which is supported.

In FIG. 4A (plan view), 41 is a variable capacitor;
42 is a variable condenser gear pivotally supported by the variable condenser 41;
Numeral 43 is a tuning gear that meshes with the variable condenser gear 42, and 46 is a tuning knob that is coaxial with the tuning gear 43. By turning the tuning knob 46 left and right, the tuning gear 43 that is coaxial with the variable condenser gear 42 is turned. They engage with each other to adjust the variable capacitor 41, and also engage with the rack 44 to move the rack 44 left and right to bring the pointer 47 provided at its end to the tuning position. In addition, 45 is easy 44
This is a guide for

FIG. 1B is a plan view of the tuning knob 46, which has a leaf spring 48 around the shaft 50 to bias the tuning gear 43.

However, the conventional dial device having the above structure has the following drawbacks.

In the threading type shown in Figure 3,
First, the work of winding the dial thread 38 was complicated, and when repairing the board 39 on which the variable capacitor 31 was mounted, the dial thread 38 had to be removed, resulting in poor work efficiency.

In addition, slips may occur between the thread drive shaft 33 and the dial thread 38, and especially at low temperatures such as in winter, the tension of the dial thread 38 becomes excessive, often causing slips.

Furthermore, in the gear type shown in FIG. 4, the gears 42, 43 and the rack 44 are all made of resin molded products, which increases the mold cost.
Cost performance was poor.

[Purpose of invention]

The purpose of the present invention is to overcome the drawbacks of the conventional techniques mentioned above, incorporate only the advantages of the threading type and gear type, and create an improved dial device that requires fewer assembly steps, does not cause slippage, and has good cost performance. Our goal is to provide the following.

〔Example〕

Hereinafter, the present invention will be specifically explained with reference to the drawings.

FIG. 1 is a plan view of essential parts of a dial device according to an embodiment of the present invention, and FIG.
FIG. 3 is a partially cutaway side view in the direction of arrows.

In Figures 1 and 2, 2 is the variable capacitor 1
The variable condenser gear is rotatably supported by a variable condenser gear, and a sliding portion 2B is provided in the middle of a plurality of radial spokes 2A, and the variable condenser gear itself has a spring property. 3 is a tuning gear that meshes with the variable condenser gear 2, and a tuning knob 6 is provided coaxially with the tuning gear.

A conical coil spring 8 is inserted into a concave portion in the center of the tuning knob 6, and urges the tuning gear 3 from below.

In addition, a pulley 4 is attached to the top of the tuning gear 3.
are provided, and slits 5 are bored at two opposing locations, and a dial thread 15 is inserted and passed through the pair of slits 5.

The dial thread 15 is wound through a pulley 14 while changing its direction, and a pointer 1 is placed on the front panel 7 side along the way.
There are 3. Further, a coil spring 12 for tension is provided in the middle, and the tension of the dial thread 15 is adjusted appropriately.

In addition, 9 is a board on which the variable capacitor 1 etc. is placed, 10 is a screw (or rivet) for fixing the common shaft of the tuning gear 3 and the tuning knob 6 to a part of the panel 7, and 11 is a It is siyashi.

In use, when the tuning knob 6 is rotated left and right, the variable condenser gear 2 that meshes with the tuning gear 3 that is coaxial with it rotates, so that the variable condenser 1 is adjusted.

At the same time, the dial thread 15 which is inserted through the leg 5 of the pulley 4 on the tuning gear 3
moves, so the pointer 13 comes to indicate the tuning position.

Further, when the pointer 13 comes to the end and the variable capacitor 1 rotates completely, the conical lock coil spring 8 starts to slip and rotates idly, thereby preventing the variable capacitor 1 from being damaged and the pointer 13 from coming off.

[Effect of idea]

Since the present invention is configured as described above,
The following effects can be achieved.

Compared to the conventional threading type (Fig. 3), pulley 3
Since a variable condenser gear 2 and a tuning gear 3 are used instead of 2, the dial thread does not slip even at low temperatures and operates reliably.

Furthermore, compared to the conventional gear type (FIG. 4), since the dial thread 15 is used instead of the rack 44, the mold cost can be reduced, resulting in good cost performance.

Since the conical coil spring 8 is used instead of the conventional leaf spring (48 in FIG. 4), only the upper part of the spring with a small contact area slides. Therefore,
Frictional resistance becomes constant, and it is easy to obtain a predetermined load and sliding resistance.

Since the threading is carried out only within the area of the panel assembly, the board 9 can be easily replaced without removing the threads 15.

Since each spoke 2A of the variable condenser gear 2 is provided with a sliding portion 2B to give it spring properties, even if a positional shift occurs between the board 9 and the panel 7, the engagement with the tuning gear 3 will be supported. does not occur.

[Brief explanation of the drawing]

Fig. 1 is a plan view of the essential parts of a dial device according to an embodiment of the present invention, Fig. 2 is a partially cutaway side view taken along arrow A-A in Fig. 1, and Fig. 3 is a conventional thread-type dial device. FIG. 4A is a plan view of the entire conventional gear type dial device, and FIG. 4B is a plan view of the same tuning knob. 1... Variable capacitor, 2... Variable capacitor gear, 2A...
... Sliding part, 3 ... Tuning gear, 4 ... Pulley, 5 ... Slit, 6 ... Tuning knob, 8 ... Conical coil spring, 13 ... Pointer, 1
5...Dial thread.

Claims (1)

[Scope of utility model registration request] A sliding part is provided in the middle of a spoke of a gear that is pivotally supported by a variable capacitor to impart spring properties to the gear, a tuning knob is provided coaxially with the gear that meshes with the gear, and a tuning knob is provided in the center of the tuning knob. A conical coil spring is inserted into the concave portion, and the gear on the same axis is caused to slide by the friction thereof.A pulley is provided above the gear biased by the conical coil spring, and a conical coil spring is inserted into the concave portion. A dial device configured to have slits in two places and to pass a dial thread through the slits.