JPS6161515A - Dial driving device - Google Patents

Abstract

PURPOSE:To save the number of components and assembling man-hours by meshing a tuning shaft, an inner tooth gear of a variable capacitor drum, a pointer rack and an outer tooth gear of the variable capacitor drum together and linking the tuning shaft and the pointer rack. CONSTITUTION:The variable capacitor drum 8 is mounted to the variable capacitor 11 soldered to a printed wiring board 12 and fixed by a screw 14. Then the tuning shaft 4 is fixed to a dial chassis 19 by an E ring 18 to mount the pointer rack 6 to ribs 22, 23 of the chassis 19. The chassis 19 is fixed to a boss 24 of a bottom case 21 by a screw 20 while a gear 5 of the shaft 4 meshes with an inner tooth gear 9 of a drum 8 and the rack 6 meshes with an outer tooth gear 10 of the drum 8. Thus, in turning the tuning knob 2, the drum 8 is used as a link member and the frequency by the variable capacitor 11 is changed by turning the drum 8 to drive the rack 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a dial driving device in electronic equipment such as a radio receiver.

Conventional configuration and its problems Traditionally, dial drive devices in electronic devices such as radio receivers have been fixed to the dial rope winding part and variable capacitor, which are configured to rotate together with the tuning shaft, with screws or the like. It has a structure in which the varicon drum is connected with a dial rope, and one or more rollers for relaying the dial rope are placed at arbitrary positions as a dial drive device for the purpose of ensuring a safety factor and reducing operating force. It was designed to let them do so.

However, the structure of the dial device described above has the disadvantage that it requires a large number of parts such as rollers, requires skill in assembly, and increases the number of man-hours. Furthermore, even after it was completed as a dial drive device, it was unstable in terms of safety factor, operating force, etc., and this sometimes caused a big problem in the quality of the set, so it was not very desirable as a dial drive device.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an excellent dial drive device that can reduce the number of parts and the number of assembly steps, and also has stable quality. .

Structure of the Invention In order to achieve the above object, the present invention is a dial drive device having a structure in which a variable capacitor drum having an integrated internal gear and external gear is used as a member for connecting a tuning shaft and a pointer rack. Furthermore, a dial drive device with stable quality can be obtained with a simple configuration.

DESCRIPTION OF THE EMBODIMENTS FIG. 1 is an external view of an embodiment of the present invention. 1 is a cabinet, and 2 is configured so that it can be operated from the front with a tuning knob. 3 is the frequency display window, tuning knob 2
It is located at the top of the. FIG. 2 is a block diagram of an embodiment of the present invention. 4 is a tuning shaft; tuning shaft 4
It has a gear part 6 integrally formed with. 6 is a pointer rack, and has a pointer 7 formed integrally with the pointer rack. Reference numeral 8 denotes a variable converter drum p, in which an internal gear 9 and an external gear 10 are integrally formed. The gear portion 6 of the tuning shaft 4 and the internal gear 9 mesh with each other, and the finger rack 6 and the external gear 10 mesh with each other to connect them. By rotating the tuning shaft 4, the variable capacitor 11 is connected. It is configured to rotate and display the frequency. FIG. 3 is a sectional view of the Mu person in FIG. 1 showing an assembled state, and 12 is a printed wiring board.

11 is a variable capacitor, which is soldered to the printed wiring board 12. The variable capacitor drum 8 is rotatably fixed to the variable capacitor 11 by screws 14. The tuning shaft 4 is rotatably fixed to the dial chassis 19 by an E ring 18, and the gear portion 5 of the tuning shaft 4 and the internal gear 9 of the variable converter drum 8 are engaged with each other. Tuning knob 2
is press-fitted into the tuning shaft 4 by the biasing force of a spring 16, and while the variable capacitor 11 is rotating, the tuning shaft 4 and the tuning knob 2 rotate together, and at the end of the rotation of the variable capacitor 11, the tuning shaft 4 and the tuning knob 20 are pressed together. It is installed so that it slips between the two. The pointer rack 6 is slidably mounted on guide ribs 22, 23 of the dial chassis 19. The pointer rack 6 and the external gear 1o of the variable converter drum 8 mesh with each other, and the tuning shaft 4 and the pointer rack 6 are connected. The frequency is displayed by a pointer 7 formed integrally with the pointer rack e. Reference numeral 15 denotes a scale plate, which is fixed to the dial chassis 19 and has a frequency printed thereon. 3 is a frequency display window, which is glued to the cabinet 1.

The operation of the dial drive device configured as described above will be described below.

Variable capacitor 11 attached to printed wiring board 12 by soldering
Attach the variable converter drum 8 to the holder and fix it with the screws 14.

Subsequently, the tuning shaft 4 is fixed to the dial chassis 19 with an E ring 18. Also, the pointer rack 6 is attached to the lips 22 and 23 of the dial chassis 19. Assemble the prepared dial chassis 19 into the bottom case 21 while engaging the gear portion 6 of the tuning shaft 4 with the internal gear 9 of the variable converter drum 8, and by engaging the pointer rack 6 with the external gear 1o of the variable converter drum 8. Fix it to the boss 24 with screws 20.

At that time, the positional relationship between the pointer rack 6 and the variable capacitor drum 8 is the MAX of the frequency display and the MAX of the variable capacitor.

Alternatively, match the MEN of the frequency display to the MIN of the variable capacitor. Next, the spring 16 is inserted into the tuning knob 2, and is fitted and press-fitted onto the tuning shaft 4.

Rotate the tuning knob 2 with the above configuration.

When operated, the variable capacitor drum 8 becomes a connecting member, and as the variable capacitor drum 8 rotates, the frequency of the variable capacitor 11 can be changed by transmitting the signal to the pointer rack 6. Also, the frequency of the variable capacitor 11 can be changed as a frequency display. A pointer 7 provided integrally with the can be displayed.

Effects of the Invention As is clear from the above explanation, according to the present invention, an internal gear and an external gear are integrally connected to the gears provided on the tuning shaft and the pointer rack to connect the tuning shaft and the pointer rack. The structure is simple by connecting the tuning shaft and the pointer rack by engaging the tuning shaft and the internal gear part of the balancing drum, and the pointer rack and the external gear part of the balancing drum. This makes it possible to significantly reduce the number of parts and assembly man-hours. Furthermore, by combining the tuning shaft and the internal gear of the recon drum, the synchronization shaft gear is installed inside the recon drum, so it can achieve a large gear ratio and can be realized in a small amount of space, making it possible to downsize. When the display section is located above the tuning knob, the rotation direction of the tuning knob and the frequency display of the pointer move from MIN to M person X, resulting in an excellent dial drive device that is natural to operate. It is.

[Brief explanation of drawings]

FIG. 1 is an external view of a device using an embodiment of the dial drive device of the present invention, FIG. 2 is a configuration diagram of a dial drive device of the embodiment of the present invention, and FIG. FIG. 1... Cabinet, 2... Tuning knob, 3... Display window, 4... Tuning shaft, 5... Tuning shaft gear section , 6...
・Pointer rack, 7...Pointer, 8...Varicon tram, 9...Varicon tram internal gear, 1Q...Varicon drum external tooth gear, 11・・・
... Variable capacitor, 12 ... Printed wiring board, 1
4... Screw, 15... Scale plate, 16...
...Spring, 18...E ring, 19...
...Dial chassis, 2o... Screw, 2
1...Bottom case, 22.23...Rep, 24...Boss of the bottom case. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] A variable capacitor drum is provided with an internal gear and an external gear integrally engaged with the gear portions provided on the tuning shaft and the pointer rack to connect the tuning shaft and the pointer rack. 1. A dial driving device characterized in that the dial drive device is configured to connect a tuning shaft and a pointer rack by engaging a toothed gear portion, the pointer rack portion, and an external gear portion of a variable converter drum.