JPH0434571Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a dial device for communication equipment such as a cassette tape recorder with a radio receiver and a radio receiver.

BACKGROUND OF THE INVENTION Various dial devices for cassette tape recorders with radio receivers have been proposed in the past, and one known is one in which channel selection is performed by applying voltage to a variable capacitor using a volume.

A conventional dial device will be described below with reference to the drawings.

A conventional dial device is shown in FIGS. 3 and 4.
In Figures 3 and 4, 1 is the volume body;
Reference numeral 2 denotes an operation knob, and a gear 2a is coaxially formed integrally therewith. 3 is a pointer rack, 4 is a lid constituting a radio receiver, 5 is a printed wiring board, and 6 is a screw. The operating knob 2 is inserted into a pin 4a formed integrally with the lid body 4. Next, printed wiring board 5
is fixed to the lid body 4 using screws 6. The volume body 1 is fixed to a printed wiring board 5 by soldering, and a gear 7 provided on the volume body 1 and a gear 2a of the operating knob 2 are engaged when the printed wiring board 5 is assembled to the lid body 4. The pointer rack 3 is inserted into a guide groove 4b for a pointer rack integrally molded on the lid 4, and the lid 4 of the operating knob 2
When assembling the pointer rack 3 and operation knob gear 2a
interlock.

The operation of the dial device configured as described above will be explained below. When the operating knob 2 is rotated in the A direction or the B direction, the gear 2a integrally formed on the operating knob 2 rotates the pointer rack 3.
is guided by the guide groove 4b and slides in the A' direction or the B' direction. The gear 7 is also rotated in the A'' direction or B'' direction by the gear 2a of the operating knob 2.
As the gear 7 rotates, the volume body 1
An electrical change occurs inside the board, and the change is transmitted to the printed wiring board 5.

Problems to be Solved by the Invention However, with the above configuration, it is impossible in mass production to eliminate any wobbling in the rotational direction at the fixed part of the volume body 1 and the gear 7, and there is some Shaking occurs. Insert the operating knob 2 into the pin 4a provided on the lid 4, and after soldering and fixing the volume body 1 to the printed wiring board 5, fix the printed wiring board 5 to the lid 4 with screws 6. Because of this, it is difficult to manage the distance C between the shafts of the operating knob 2 and the gear 7 to match the theoretical design value, and there is a drawback that the distance C varies widely. If the distance C between the shafts is larger than the theoretical design value, the idle rotation angle will become large, and if the variation is larger than the meshing dimensions of the gears, the gear 7 and the gear 2a of the operating knob 2 will spin idly.

In view of the above problems, the present invention provides a dial device that can improve drive transmission accuracy.

Means for Solving the Problems In order to solve the above problems, the dial device of the present invention includes a rotating gear that is pivotally supported on a frame having a resistor, and a volume that is provided with a sliding piece that comes into sliding contact with the resistor. , an operation knob that is pivotally supported on a frame that constitutes the volume and has a gear that engages with the rotating gear, and a pointer rack that engages with the rotating gear that makes up the volume, the frame that makes up the volume; It is characterized in that the support shaft is positioned on the lid body.

Function The present invention integrates the volume body and the rotating gear, and arranges the volume body and the operating knob on the same frame that can be fixed to the lid body, and the pointer rack is meshed with the rotating gear integrated into the volume body. Because of this structure, drive transmission accuracy can be improved by positioning the center of rotation of the rotating gear integrated into the volume and using it as a drive reference for other operating knobs and pointer racks.

Embodiment A dial device according to an embodiment of the present invention will be described below with reference to the drawings. An embodiment of the present invention is shown in FIGS. 1 and 2. In FIGS. 1 and 2, 11 is a volume with a sliding piece 11 on its inner surface.
The rotating gear 11a to which b is attached, and this sliding piece 1
It is composed of a frame 11e having a resistor (not shown) that is in sliding contact with the frame 11b. Reference numeral 12 designates an operation knob, in which a gear 12a is integrally molded coaxially, and a rotating gear 11a and a gear 12a are engaged with each other, and a volume side shaft serves as the rotation center of the rotating gear 11a and the gear 12a of the operating knob 12. 11c and the operating shaft 11d are attached to the same frame 11e. This frame 11
e has a convex portion 11f on the operating side, and this convex portion 11
f is positioned by being fitted into the groove 14c of the lid body 14. A pointer rack 13 is inserted into a guide groove 14b provided in the lid 14 and slides within the guide groove 14a. Printed wiring board 15 is fixed to lid 14 with screws 16. Shaft 11c as a component of volume 11
As can be seen in FIG. 2, the tip has a convex shape, and is positioned by fitting into the hole 14a of the lid 14, and the terminal portion is soldered to the printed wiring board 15.

The operation of the dial device configured as described above will be explained using FIG. 2. When the operating knob 12 is rotated in the X direction or the Y direction, the rotating gear 11a meshing with the gear 12a integrally formed on the operating knob 12 rotates in the X' direction or the Y direction.
Rotate in the Y′ direction. A sliding piece 11b is attached inside the rotating gear 11a, and electrical changes occur when this sliding piece rotates. The electrical changes are transmitted to the printed wiring board 15.
Also, when the rotating gear 11a rotates, the pointer rack 13 meshed with the rotating gear 11a moves.
It slides along the guide groove 14b in the X'' direction or Y'' direction.

As described above, according to this embodiment, the volume side shaft 11c and the operating side shaft 11d are provided in the same frame, and the inter-axle distance C can be determined with high accuracy. In addition, the shaft 11c, which is the center of rotation of the rotating gear 11a constituting the volume, is connected to the lid 1.
4, the center distance D from the pointer rack 13 sliding on the lid 14 can be determined with high accuracy.

Effects of the invention As described above, the present invention engages the rotating gear of the volume, which is the base of the rotation, with a direct operation knob and a pointer rack that slides on the lid, and positions the rotation axis of the rotating gear of the volume on the lid. By doing so, it is possible to improve the driving accuracy of each rotary sliding member.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of a dial device according to an embodiment of the present invention, Fig. 2 shows the assembled state of Fig. 1, A is a plan view, B is a sectional view taken along line A-A, and Fig. 3 is a conventional dial device. FIG. 4 is an exploded perspective view of the dial device, and FIG. 4 is a plan view showing the assembled state of FIG. 3. 11... Volume, 11a... Rotating gear, 1
2...operation knob, 12a...gear, 13...pointer rack, 14...lid, 15...printed wiring board, 16...screw.

Claims (1)

[Scope of utility model claims] An operation that includes a volume in which a rotating gear having a sliding piece that slides on a resistor provided on the frame is pivotally supported on the frame, and a gear that is pivotally supported in the frame constituting the volume and meshed with the rotating gear. A knob and a pointer rack that is guided by a guide groove provided in a lid housing a printed wiring board to which the volume is attached and engaged with a rotating gear that makes up the volume, and a shaft and a frame that make up the volume. A dial device characterized by positioning by a lid body.