JPS60174514A - Dial device - Google Patents

Abstract

PURPOSE:To engage the gear of a dial operating part with a variable capacitor gear accurately and to facilitate assembling operation by fitting a chassis which is equipped with the dial operating part to the fitting part of a printed wiring board provided on the basis of the fitting part of a variable capacitor. CONSTITUTION:The dial chassis 4 of the dial device is provided with the dial operating part consisting of a knob 5, gear 5a, pointer rack 6, etc. The variable capacitor gear 1 is clamped to the variable capacitor 2, the projection 7b of the variable capacitor 2 is inserted into the hole formed in the printed wiring board 13, and the variable capacitor 2 is fixed to the wiring board 13. A main body chassis 3 is fixed to the wiring board 13 in one body. Further, the dial chassis 4 is fitted to the fitting part of the wiring board 13 on the basis of the projection 7b of the variable capacitor 2. The gear 5a of dial operating part is engaged accurately with the variable capacitor gear 1a and the assembling operation of the dial device is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dial device used in audio equipment such as radio receivers and tape recorders with radio receivers.

2. Description of the Related Art Conventional Structures and Problems Conventionally, dial devices used in audio equipment such as radio receivers and tape recorders with radio receivers have a structure driven by gears or racks. In this dial device, a gear is attached to the shaft of a variable capacitor provided on a printed wiring board, and a gear that moves the pointer and knob of the dial operation section corresponds to a chassis that is built into the equipment cabinet in order to interlock with the gear. It was of a structure that could be installed like this.

However, in the conventional dial device described above, the printed wiring board and chassis are often installed separately in the equipment cabinet, and due to installation errors of the printed wiring board and the dial operation section, the variable condenser gear and The distance between the shaft and the gear on the dial operation part side is not constant,
There was a drawback that the gear meshing became unstable. Also,
There are some models that fix the dial operation part directly on the printed wiring board and maintain the dimension between the shafts of the gears. Screws for installation.

Component parts such as nuts are required, and the assembly workability and cost are also unsatisfactory.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks, and has a simple structure that allows the gear of the dial operation section to reliably mesh with the variable condenser gear of the variable condenser directly attached to the printed wiring board. The object of the present invention is to provide a dial device that can improve assembly workability and reduce the number of parts.

114th aspect of the invention In order to achieve the above object, the dial device of the present invention has a chassis equipped with a dial operation section, which is attached to a mounting section of a printed wiring board provided with reference to the mounting section of a variable capacitor. The feature is that the gear of the dial operation part and the variable condenser gear are configured to mesh accurately.

DESCRIPTION OF EMBODIMENTS The dial device of the present invention will be described below with reference to drawings of embodiments. Fig. 1 is an assembled perspective view of this embodiment, Fig. 2 is an assembled perspective view of its main parts, Fig. 3 is a plan view showing its gear configuration, and Fig. 4 is a sectional view taken along line AA of the same device. . In FIGS. 1 to 4, a variable condenser gear 1 is attached to a variable condenser 2 by screwing or caulking. The variable capacitor 2 is accurately positioned and directly attached by inserting a projection 7b' (i7) integrally provided on the main body of the variable capacitor 2 into a hole provided in the flint wiring board 13.

The main body chassis 3 is formed integrally with the main body chassis 3, and is positioned and fixed to the printed wiring board 13 by means of the main body chassis 3. At this time, the main body chassis 3 is equipped with a module 19 to attach parts such as a ferrite antenna that do not directly affect the gear drive. Next, the knob 5 is fitted onto a mounting shaft 12 that is integrally formed on the dial chassis 4, and the knob 5 is mounted using a claw 12& at the tip of the mounting shaft 12 so that it does not come off, and the pointer rack 6 is mounted. , are made into one block. The dial shear 74 is connected to the main body shear 3 by means of a fitting claw 10, a hook 7 knob 9a and a protrusion 7a integrally formed therein. A printed wiring board 131C is attached. A positioning hole 8 is provided in the printed wiring board 13 at a position opposite to the protrusion 7a.
is provided in the exact positional relationship with the mounting position of the variable capacitor 2.The dial chassis 13 is connected to the dial chassis 13 by the vertical determining hole 8.
By fully positioning the block, the fifth knob gear 5a accurately interlocks with the variable condenser gear 1, and the distance between the shafts is 1'x.
It is possible to achieve higher precision and ensure reliable gear meshing. Since the attachment shaft 12 and the projection 7a are integrally formed on the dial chassis 13, the positional relationship between the center of the take-up 1 shaft 12 and the center of the projection 7a is extremely accurate.

Effects of the Invention As described above, according to the present invention, a dial operating section is provided on a dial chassis independent of a water body chassis, and the dial chassis having this dial operating section is directly positioned on a printed wiring board having a variable capacitor directly attached thereto. Since it is configured to be fixed, the distance between the shafts of the gear of the dial operating section and the variable condenser gear can be accurately maintained, and the meshing of the gears can be ensured. Further, since the dial operating section is fitted and attached to the dial chassis, the number of parts can be reduced, and a dial device with good assembly workability can be provided.

[Brief explanation of the drawing]

FIG. 1 is an assembled perspective view of one embodiment of the dial device of the present invention, FIG. 2 is a perspective view of the main parts of the device in an assembled state, FIG. 3 is a plan view showing its gear configuration, and FIG. The figure is a sectional view taken along the line AA in FIG. 3. 1... Variable capacitor gear, 2... Variable capacitor, 3... Body chassis, 4... Dial chassis, 6... Knob, 6a...・・・・・・
Gear, 6... Pointer rack, OK. 7b, 70...Protrusion, 8...Positioning hole, 91L. 9b...Hook is rib, 10...Fitting claw, 11...Mounting screw, 12...Mounting shaft, 12a...Claw , 13...Printed wiring board. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A dial chassis independent of the main body chassis, which is equipped with a dial operation part equipped with a gear and a pointer driven by the dial operation part, and a printed wiring board on which a variable capacitor equipped with a gear is directly attached to the variable capacitor shaft. and the dial chassis is connected to the mounting part tS of the variable capacitor.
1. A dial device, characterized in that the variable condenser gear and the gear on the side of the dial operating portion are configured to be interlocked by being attached to the receiving portion of the printed wiring board provided in accordance with the above.