JP2569177Y2 - Dial device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dial device for audio equipment such as a radio receiver and a cassette tape recorder with a radio receiver.

[0002]

2. Description of the Related Art For example, Japanese Unexamined Utility Model Publication No. 60-27527 (H03J1 / 08) discloses that a rotary motion of a button gear provided integrally with a dial operation knob is rotatably supported by a screw of a chassis. A dial device configured to transmit to a variable condenser gear of a variable condenser directly attached to a printed circuit board via an intermediate gear, absorb variations in the inter-axis dimensions of the variable condenser gear and the button gear, and reliably engage the gears. Is disclosed.

However, the dial device has a button gear and an intermediate gear provided integrally with the dial operation knob,
When the dial operation knob is rotated clockwise, the intermediate gear works in the direction that makes it difficult for the button gear and the variable condenser gear to enter, causing a sense of stickiness during dial operation, and turning the dial operation knob counterclockwise. When rotated in the direction, the intermediate gear acts in a direction in which the intermediate gear is disengaged.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described drawbacks, and has been described in connection with a case where an intermediate gear is interposed between a gear integrated with a dial operation knob and a variable condenser gear, and the dial operation knob is rotated. To solve the feeling of backlash and stiffness.

[0005]

According to the present invention, an intermediate gear (11) is provided between a dial gear (5) provided integrally with a dial operation knob (6) and a variable condenser gear (1) mounted on a variable condenser shaft. The intermediate gear (11) is arranged in a straight line between the dial gear (5) and the variable condenser gear (1). ) Are provided with predetermined gaps (D) and (D), and the intermediate gear is formed elastically.

[0006]

According to the present invention, since the intermediate gear is arranged on the line between each axis of the dial gear and the variable gear, the rotating force of the dial operating knob when the dial operating knob is rotated is increased in the direction of rotation. Irrespective of the rotational force, the same torque is transmitted to the variable gear, and the intermediate gear has a predetermined gap in the direction of the dial gear and the variable gear.
The intermediate gear is deformed and has an elastic force in the range of the gap, and transmits the movement of the dial operation knob to the variable condenser gear with the same feeling regardless of the rotation direction.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a dial device according to the present invention. 1 is a perspective view showing an assembled state of a dial device according to an embodiment of the present invention, FIG. 2 is a plan view showing a gear configuration of the embodiment, and FIG. 2 is a state in which an intermediate gear of the embodiment is mounted on a shaft of a chassis. FIG. 4 is an enlarged plan view of FIG.

In FIG. 1, a variable condenser gear (1) is fixed to a shaft of a variable condenser (3) directly attached to a printed circuit board (2) by screws (4).

The dial gear (5) is provided integrally with the dial operation knob (6), and its gear shaft is inserted into a chassis hole (not shown) provided in the chassis (7) so as to be rotatable. Attached by). Further, the dial gear meshes with a rack gear (10) of a rack (9) that transmits a rotational movement of the dial operation knob (6) to a dial pointer, and an intermediate gear (1) described later.
It is attached so as to mesh with 1).

As shown in FIG. 3, the gear shaft (12) of the intermediate gear (11) is constituted by a ring-shaped gear molded to have elasticity by a synthetic resin material. The intermediate gear (11) is implanted in the chassis (7), and is provided between the intermediate gear (11) and the gear shaft (12).
The dial gear (5) side and the variable condenser gear (1) side have parallel portions (C) and (C), and the gear shaft (1)
An intermediate gear (11) is loosely inserted into 2), and a dial operation unit is configured as a chassis block (13) together with the dial gear (5).

When the dial operating portion is mounted on the printed circuit board (2), the intermediate gear (11) and the varicon gear () are formed by a projection (14) and a hooking rib (15) provided on a chassis (7). Positioning with 1) is performed. Then, by the positioning, the position of the gear shaft (12) of the intermediate gear (11) is changed to the variable gear (1) and the dial gear (5) as shown in FIG.
When the dial operation knob is rotated in the direction of arrow A (clockwise) and when it is rotated in the direction of arrow B (counterclockwise), the rotational force of the dial operation knob is determined by the rotation of the dial operation knob. It is transmitted to the variable condenser gear with the same rotational force regardless of the direction.

The intermediate gear (11) has a predetermined gap (D) in the direction of the dial gear (5) and the variable condenser gear (1) in a state of being loosely fitted to the gear shaft (12). (D) is inserted so that variations in the center distance between the intermediate gear and the dial gear and / or variable condenser gear are absorbed, and the intermediate gear acts in a direction in which the intermediate between the dial gear and the variable condenser gear is difficult to enter. The backlash which is caused by the sense of stiffness and the movement of the intermediate gear in the disengagement direction is prevented, and the movement of the dial operation knob is transmitted to the variable condenser gear with the same feeling regardless of the rotation direction of the operation knob.

Thus, the rotation of the dial operation knob is transmitted to the variable condenser gear via the intermediate gear, and is transmitted in synchronization with the rack gear.

[0014]

As described above, according to the present invention, since the intermediate gear is disposed on the line between each axis of the dial gear and the variable condenser gear, the rotational force of the dial operating knob is the same regardless of the rotational direction. Is transmitted to the variable condenser gear. In addition, since the intermediate gear is configured to have elasticity in the direction of the dial gear and the variable gear gear, variations in the center distance between the intermediate gear and the dial gear and / or the variable gear are absorbed, and the gears mesh with each other. The present invention provides an excellent dial device that can perform the rotation operation more reliably, prevent a squeaky feeling and backlash generated when the dial operation knob is rotated, and can perform a smooth rotation motion.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an assembled state of a dial device according to an embodiment of the present invention;

FIG. 2 is a plan view showing a gear configuration of the embodiment.

FIG. 3 is an enlarged plan view of an intermediate gear according to the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Variable gear 5 Dial gear 6 Dial operation knob 11 Intermediate gear 12 Gear shaft D Clearance

Claims (1)

(57) [Scope of request for utility model registration] 1. A dial gear provided integrally with a dial operation knob, a variable condenser gear attached to a variable condenser shaft, an annular intermediate gear made of an elastic body provided between the dial gear and the variable condenser gear, and the intermediate gear A gear shaft having a gear rotatably mounted thereon, the dial device driving a variable condenser by operating the dial operation knob, wherein the intermediate gear has a surface meshed with the dial gear and the intermediate gear has In order to elastically press the dial gear with the intermediate gear and the variable gear with the intermediate gear by providing a predetermined gap between the inner surface of the intermediate gear and the surface of the gear shaft inside the surface meshing with the variable gear. A dial device, wherein a parallel portion is formed on the gear shaft.