JP2897235B2 - Dial drive - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dial drive device used for a radio receiver and can be shared by different tuner blocks.

2. Description of the Related Art In recent years, dial drive devices have been simplified and their components have been commonly used, and the rationalization of the devices has been made. Hereinafter, an example of a conventional dial driving device will be described with reference to the drawings.

8 and 9 show a conventional dial driving device. 8 and 9, 81 is a synthetic resin chassis, 82 is a pointer rack, 83 is a rotary knob, 84 is a pointer guide formed on the chassis 81, 85 is a rack guide formed on the chassis 81, 86 Is a small diameter gear formed integrally with the rotary knob 83, and 87 is a pointer formed integrally with the tip of the pointer rack 82. Here, the rotary knob 83 has its rotary shaft 83A inserted into a bearing hole 88 provided in the chassis 81 and is rotatably supported.The rotary knob 83 has a small diameter gear 86 at the tip of the rotary shaft 83A and the rack guide 85. The pointer rack 82 slidably supported by the guide rack 82 is engaged with the pointer rack 82 so that the pointer 87 at the tip of the pointer rack 82 traverses the pointer guide 84. Then, the dial block configured as described above is stored in the cabinet 89 as shown in FIG.
A gear shaft 90 protruding from the other side of the rotary knob 83 meshes with the internal teeth of the idler gear 91. The idler gear 91 is fixed to a rotating shaft of a variable condenser 93 attached to a printed circuit board 92 with a screw 94. In FIG. 9, reference numeral 95 denotes a ferrite antenna.

10 and 11 show a conventional dial driving device. 10 and 11, 101 is a synthetic resin chassis, 102 is a pointer rack, 103 is a rotary knob, 104 is a pointer guide formed on the chassis 101, 105 is a rack guide formed on the chassis 101, 106 Is the above rotary knob
A large-diameter gear coaxial with 103 and a pointer 107 are connected to the pointer rack 102 via a connecting rod 108. Here, the rotary knob 103 has its rotary shaft 103A inserted into a bearing hole 109 provided in the chassis 101 and is rotatably supported, and is slidably supported by a large diameter gear 106 by the rack guide 105. The pointer rack 102 is engaged with the pointer rack 1
The pointer 107 is configured to traverse on the pointer guide 104 following the movement of 02. Then, the dial block configured as described above is housed in the cabinet 110 as shown in FIG. 11, and the rotating shaft 103A of the rotating knob 103 is fixed to the variable condenser 112 provided on the printed circuit board 111 with the screw 113. Have been. In FIG. 11, reference numeral 114 denotes a ferrite antenna.

In the dial drive device configured as described above, when the rotary knob 83 or 103 is rotated in a certain direction, the variable control 93 or 11 is directly connected to the knob or via the idler gear 91.
2 rotates, and any receiving frequency can be selected. At the same time, the pointer rack 82 or 102 meshing with the small diameter gear 86 or the large diameter gear 106 provided on the rotary knob 83 or 103 moves along the rack guide 85 or 105 in the same direction as the rotation direction of the knob, and Pointer 87 or 107 provided at the tip
Will move along the pointer guide 84 or 104.
When the rotary knob 83 or 103 is rotated in the opposite direction, the pointer 87 or 107 moves in the opposite direction.

Problems to be Solved by the Invention However, in the above-described conventional configuration, a dial block of a chassis having a different shape corresponding to each of the two types of tuner blocks is required. There is a disadvantage that loss occurs and two types of molds are required, which is disadvantageous in cost.

The present invention has been made in view of the above problems, and has a
It is an object of the present invention to provide a dial drive device which comprises two types of dial blocks, is shared so as to correspond to two types of tuner blocks, and can reduce the number of parts.

Means for Solving the Problems In order to solve the above problems, a dial driving device according to the present invention includes a chassis having a single pointer guide portion, which travels a first pointer rack driven by a knob provided with a small diameter gear. A first rack guide portion for guiding, and a second rack guide portion disposed at the same position as the knob provided with the small diameter gear and guiding the travel of the second pointer rack driven by the knob having the large diameter gear. Is provided.

According to the present invention, two types of rack guides can be provided in one chassis by matching the mounting positions of the knobs provided with the small-diameter gear and the large-diameter gear by the above-described configuration,
One type of dial chassis can be standardized for different tuner blocks. At this time, the knob provided with the large-diameter gear can be set so that it can be directly inserted and attached to the shaft of the variable condenser.

Embodiment Hereinafter, a dial driving device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows a dial driving device according to an embodiment of the present invention, and shows a dial block constituted by a small-diameter geared knob. In FIG. 1, 11 is a chassis, 12 is a pointer rack, 13 is a knob provided with a small diameter gear 18,
14 is a pointer guide provided on the chassis 11, 15 is a first rack guide, and 16 is a second guide in the case of a knob having a large diameter gear.
The rack guide 17 is a pointer 18 provided at the tip of the pointer rack.
Is a small diameter gear. FIG. 2 shows a state in which the dial block is mounted on a tuner block. To explain the operation of this combination example, when the knob 13 is rotated in the direction of the arrow, the small diameter gear 18 rotates in the same direction. The pointer rack 12 meshing with the small-diameter gear 18 moves along the first rack guide 51 in the rotational direction, and the pointer 17 provided at the end of the pointer rack 12 simultaneously moves along the pointer guide 14 to indicate the position. Become. At this time, when the knob 13 rotates in FIG.
The variable condenser 93 also rotates in the same direction as the arrow via 91, and an arbitrary reception frequency can be selected. FIG. 3 is a sectional view taken along the line AA of FIG. 1, showing the meshing state of the small diameter gear and the pointer rack.

FIG. 4 shows a dial driving device according to an embodiment of the present invention, and shows a dial block constituted by a knob with a large diameter gear. In Fig. 4, 19 is a large diameter gear
A knob provided with 20, a large diameter gear 20, and a pointer rack 21 driven by the large diameter gear. FIG. 5 shows a state in which the dial block is mounted on a tuner block. The difference between the operation of this combination example and the first combination example is as follows.
When the 19 is rotated in the direction of the arrow, the large-diameter gear 20 also rotates in the same direction, and the pointer rack 21 meshing with this rotates along the second rack guide 16. Therefore, the pointer 17 also moves in the same direction at the same time. FIG. 6 is a cross-sectional view of FIG. 4B-B, and FIG. 7 is a diagram showing a state in which the knob provided with the large-diameter gear is engaged with the pointer rack.

As described above, according to this embodiment, the first rack guide that guides the traveling of the first pointer rack driven by the knob provided with the small diameter gear and the knob provided with the small diameter gear are arranged at the same position. By providing a second rack guide portion for guiding the travel of the second pointer rack driven by a knob provided with a large diameter gear, two different drive systems are formed by one chassis, and Different models can be supported.

Effect of the Invention As described above, the present invention can realize a dial block having two different drive systems by providing two different rack guides in one chassis. A drive system with a knob provided with a small diameter gear or a drive system with a knob provided with a large diameter gear can be selected and adopted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a dial block of a dial driving device according to an embodiment of the present invention, FIG. 2 is a sectional view showing a state where the dial block of FIG. 1 is mounted on a tuner block, and FIG. AA sectional view, FIG. 4 is a perspective view showing a dial block of a dial driving device in one embodiment of the present invention, and FIG. 5 is a sectional view showing a state where the dial block of FIG. 4 is mounted on a tuner block. 6, FIG. 6 is a cross-sectional view of FIG. 4B-B, FIG. 7 is a rear view of the knob portion of FIG. 5, FIG. 8 and FIG. 10 and 11 are a perspective view and a sectional view showing a conventional dial driving device, respectively.

Claims (1)

(57) [Claims] A first guide unit corresponding to a dial scale, a first rack guide unit that guides the movement of a first pointer rack driven by a knob provided with a small diameter gear, and a small diameter gear. A dial driving device comprising: a second rack guide portion for guiding the travel of a second pointer rack driven by a knob provided with a large diameter gear located at the same position as the provided knob.