JP4388800B2 - Braking force adjustment mechanism of rotary knob - Google Patents

Description

  The present invention provides a braking force of a rotary knob that performs a delicate operation to finely adjust the frequency, such as a rotary knob of a main dial of a radio, or operates quickly to greatly change the frequency. It relates to a mechanism for adjustment.

  Conventionally, regarding a mechanism for adjusting the braking force of the rotary knob, a configuration in which a pad such as a felt is pressed against the side surface of the rotary knob has been proposed (see, for example, Patent Documents 1 and 2).

Japanese Patent Laid-Open No. 8-21957 JP-A-9-34575

In Patent Document 1, a fixed member in which rotation of the dial shaft in the direction around the axis is restricted, a friction member pressed against the fixed member by a spring, and a hole provided in the fixed member and the friction member are loosely inserted. A rotary knob fitted to the end of the dial shaft, and a braking force adjustment of a rotary knob provided with a compression adjusting means for adjusting the compressive force of the spring by a reciprocating screw disposed on the rotary knob. A mechanism is disclosed.
In Patent Document 2, an operation lever and a pair of tongue pieces are provided on a rotatable operation plate that is rotatably mounted coaxially with the rotation knob. A felt attached to the surface of the tongue piece is attached to the back surface of the rotation knob. The braking force is changed by adjusting the pressing force.
However, the device described in Patent Document 1 has a problem that when adjusting the braking force, a tool (driver or the like) for adjusting the screw is necessary and cannot be easily adjusted.
Moreover, since the operation lever is protrudingly provided on the operation plate for adjusting the braking force, the one described in Patent Document 2 is preferable in terms of design because the operation lever is exposed beside the rotary knob. There was no problem. Also, if the felt is pressed too hard against the back of the rotary knob to increase the braking force, there is a risk that the rotary knob will come off the shaft.

  Therefore, the present invention has been made for the purpose of providing a braking force adjusting mechanism for a rotary knob having a structure that does not require a dedicated tool for adjusting the braking force and has an excellent design. .

Claim 1 of the braking force adjusting mechanism of the rotary knob according to the present invention is:
A pressing member for pressing the rotary knob in the radial direction;
Adjusting means for adjusting the pressure of the pressing member according to the amount of operation applied from the outside;
The pressing member is
The inner wall surface formed on the back side of the rotary knob is configured to press radially from the shaft core,
The adjusting means is
An operation slide disposed below the rotary knob;
A connecting means for applying a pressing force according to the position of the operating slide body to the pressing member;
In the braking force adjustment mechanism of the rotary knob
The connecting means includes
A rotating plate that rotates according to the slide amount of the operation slide body;
A fixed plate for applying a pressing force to the pressing member according to the rotation angle of the rotating plate;
With
The rotating plate is formed with a cam portion having a different radius on the outer periphery,
The fixed plate includes an arm extending into a groove formed on the back surface of the rotary knob,
By expanding the cam portion formed on the rotating plate according to the slide amount of the operation slide body, the pressing member at the tip of the arm formed on the fixed plate is placed on the inner wall surface of the groove. It is configured to press and adjust the braking effect for the rotation operation of the rotary knob.
In claim 2,
A holding means for holding at least one of the pressing member, the operation slide body, and the rotating plate at a position corresponding to the operation amount is added.

The braking force adjusting mechanism of the rotary knob of the present invention is
A pressing member for pressing the rotary knob in the radial direction;
Adjusting means for adjusting the pressure of the pressing member according to the amount of operation applied from the outside;
The pressing member is
The inner wall surface formed on the back side of the rotary knob is configured to press radially from the shaft core,
The adjusting means is
An operation slide disposed below the rotary knob;
In the braking force adjusting mechanism of the rotary knob, comprising a connecting means for applying a pressing force according to the position of the operating slide body to the pressing force member,
The connecting means includes
A rotating plate that rotates according to the slide amount of the operation slide body;
A fixed plate for applying a pressing force to the pressing member according to the rotation angle of the rotating plate;
With
The rotating plate is formed with a cam portion having a different radius on the outer periphery,
The fixed plate includes an arm extending into a groove formed on the back surface of the rotary knob,
By expanding the cam portion formed on the rotating plate according to the slide amount of the operation slide body, the pressing member at the tip of the arm formed on the fixed plate is placed on the inner wall surface of the groove. Since it is configured to press and adjust the braking effect on the rotation operation of the rotary knob,
By pressing the pressing member not in the axial direction of the rotary knob but in the radial direction of the rotary knob , a tool is not required to adjust the braking force, and the rotary knob is detached or damaged. Since the problem is solved, excellent operability is obtained.
In addition, since the inner wall surface formed on the back side of the rotary knob is pressed by the pressing member in the radial direction from the axial center, the pressing member is disposed so as not to stand out on the back side of the rotary knob. As a result, the appearance around the rotary knob is not impaired.
Further, since the operation slide body as the adjusting means is arranged below the rotary knob, the adjusting means can be configured so as not to stand out around the rotary knob, and the appearance around the rotary knob is not impaired.
The connecting means for applying a pressing force according to the position of the operating slide body to the pressing force member includes a rotating plate that rotates according to the sliding amount of the operating slide body, and a pressing force that corresponds to the rotation angle of the rotating plate. Since it comprised with the fixed board which applies a pressure to the said press member, the operativity which was excellent with simple structure is acquired.
In addition, since the holding means holds at least one of the pressing member, the operation slide body, or the rotating plate at a position corresponding to the operation amount, the pressing force is unlikely to change on its own and has excellent operability. Is obtained.

Hereinafter, a braking force adjusting mechanism for a rotary knob according to the present invention will be described in detail with reference to the drawings of a wireless communication device adopting the embodiment.
FIG. 1 is an overall perspective view of the wireless communication device. A large liquid crystal display device 12 is provided on an operation panel 2 on the front surface of the wireless communication device 1, and a rotary knob 3 of a main dial for setting an operation frequency and the like. Various operation switches and rotary knobs are provided.

The rotary knob 3 employs the rotary knob braking force adjusting mechanism 4 according to the embodiment of the present invention. With respect to the rotation operation of the rotary knob 3, the user does not need a tool such as a driver, and the user can select a strong strength. It is configured so that it can be easily adjusted to the braking force.
An operation slide body 6 for adjusting the braking force of the braking force adjusting mechanism 4 of the rotary knob is provided below the rotary knob 3 so as not to be exposed on the front side of the operation panel 2. Yes.
The braking force adjusting mechanism 4 of the rotary knob will be described with reference to FIGS.

FIG. 2 is an explanatory diagram of the braking force adjusting mechanism 4 of the rotary knob in a state where no braking force is applied. FIG. 2A shows the braking force adjusting mechanism 4 of the rotary knob viewed from the back side of the operation panel 2. It is a rear view. FIG. 2B is a cross-sectional view taken along the line AA in FIG.
2A and 2B, the rotary knob 3 is fitted on the shaft of the rotary encoder 41, and the rotary encoder 41 is fixed to a part of the operation panel 2 by a nut 43 together with a fixing plate 42. Yes. The fixed plate 42 is formed with an arm 45 extending to the inside of a groove 31 formed on the back surface of the rotary knob 3. A pad 46 made of felt or the like is attached to the outer surface of the tip of the arm 45.
A front view of the fixed plate 42 viewed from the rotary knob side is shown in FIG. 5A, and a plan view is shown in FIG. 5B.

  2A and 2B, a rotating plate 51 that is rotatable independently of the axis of the rotary knob 3 is attached to the operation panel 2. An arcuate cam portion 52 having a different radius is formed on the outer periphery of the rotating plate 51. As shown in FIG. 3A, in the cam portion 52, a small-diameter portion 52a having a small radius and a large-diameter portion 52b whose radius gradually increases are formed at point target positions around the axis. Has been. The distance Wa between the small diameter portions 52a and 52a is smaller than the distance Wb between the large diameter portions 52b and 52b.

Further, as shown in FIGS. 2A and 3A, a connecting arm 53 is extended in the radial direction on the outer periphery of the rotating plate 51, and a distal end portion 54 of the connecting arm 53 is provided. Is bent and loosely inserted into a hole 61 formed in the operation slide body 6. The operation convex portion 62 of the operation slide body 6 is disposed so as to be slightly exposed in an operation hole 63 formed on the lower surface of the operation panel 2.
Further, a locking arm 55 extends in the radial direction in the direction opposite to the connecting arm 53, and a locking projection 56 is formed at the tip of the locking arm 55. The locking projections 56 are urged so as to be pressed against and locked with any one of the plurality of concave and convex grooves 57 formed on a part of the operation panel 2.
The pad 46 constitutes a pressing member described in the claims,
The operation slide body 6, the fixed plate 42, the arm 45, the rotation plate 51, the cam portion 52, the connecting arm 53, the tip portion 54, and the hole 61 of the operation slide body 6 constitute adjustment means described in the claims. ,
The fixed plate 42, the arm 45, the rotating plate 51, the cam portion 52, the connecting arm 53, the tip portion 54, and the hole 61 of the operation slide body 6 constitute connecting means described in the claims.

As shown in FIG. 2B, FIG. 3B, and FIG. 4B, a groove 31 is formed along the circumference of a predetermined radius on the back side of the rotary knob 3. The diameter Wd of the inner wall surface 32 of the groove 31 is larger than the distance Wc between the pads 46 of the fixed plate 42 in the state where there is no influence of external force.
As shown in FIGS. 2 (a) and 3 (c), the fixed plate 42 is not affected by external force. As shown in FIG. The arm 45 is not expanded in diameter.

Next, as shown in FIGS. 3D and 4A, when the operation slide body 6 is slid in the arrow direction, the hole 61 is also slid in the arrow direction. Accordingly, since the tip portion 54 of the rotating plate 51 loosely inserted in the hole 61 also moves in the direction of the arrow, the rotating plate 51 is as shown in FIGS. 3 (d) and 4 (a). Rotate to the correct state.
Accordingly, the cam portion 52 of the rotating plate 51 corresponding to the arm 45 of the fixed plate 42 rotates from the small diameter portion 52a to the enlarged diameter portion 52b, so that the distance between the cam portions 52 and 52 increases and Wb and Become.
As a result, both arms 45 of the fixing plate 42 are spread and the pads 46 and 46 are pressed against the inner wall surface 32 as shown in FIG. The frictional resistance between the two increases. Therefore, when the rotary knob 3 is rotated, braking by the frictional resistance is applied, and it becomes easy to perform a delicate rotation operation.
Since the diameter-enlarged portion 52b of the cam portion 52 of the rotating plate 51 is gradually enlarged, the braking effect by the frictional resistance is adjusted according to the amount by which the operation slide body 6 is slid.

  2A and 4A, the locking projection 56 of the rotating plate 51 is pressed against the concave and convex groove 57 of the operation panel 2, so that the operation slide Unless the body 6 is operated, it does not move freely. Therefore, the states of FIG. 3D and FIGS. 4A and 4B are maintained.

  When the operation slide body 6 shown in (a) of FIG. 3 is slid in the direction opposite to the arrow to return to the states of (a), (b), and (c) of FIG. Since the pads 46 and 46 are separated from the inner wall surface 32 of the rotary knob 3, there is no frictional resistance between the pads 46 and 46 and the inner wall surface 32 of the rotary knob 3, and the rotational operation of the rotary knob 3 is in the lightest state. Become.

  The operation slide body 6 is disposed below the rotary knob 3, and the operation convex portion 62 is only slightly exposed in an operation hole 63 formed on the lower surface of the operation panel 2. Since it is not exposed at all on the front side of the panel 2, the design of the wireless communication device is not adversely affected. In addition, since it is not a rotating type adjusting mechanism but a sliding type rotating knob braking force adjusting mechanism, an excellent aesthetics can be obtained even in the braking force adjusting mechanism portion of the rotating knob. In addition, since a fingertip is put under the operation panel 2 to easily operate the operation convex portion 62, a tool is unnecessary and excellent operability can be obtained.

  Furthermore, the direction in which the pad is pressed against the rotary knob in order to give a braking force is the radial direction of the rotary knob, not the direction in which the rotary knob is pulled out, so there is a risk that the rotary knob will fall off even if a braking force is applied. Absent.

In the embodiment of the present invention, as shown in FIGS. 2, 3, and 4, the uneven structure 57 is equally spaced so that the position of the operation slide body 6 can be maintained wherever it is. Further, the small-diameter portion 52a of the cam portion 52 has an arc shape, and the enlarged-diameter portion 52b has a linear shape so that the diameter changes depending on the position. The cam portion 52 is provided at two locations, the fixing plate 42 is provided with two arms 45, and the pad 46 is provided at two locations. The operation panel 2 is provided with a short cylindrical convex portion 21 coaxial with the rotary knob 3, and a rotating plate 51 is rotatably mounted on the convex portion 22.
Note that the shape of the cam portion 52 is not limited to the illustrated shape, and any configuration may be used as long as the diameter changes according to the position of the adjusting means. Further, the cam portion 52, the arm 45 of the fixing plate 42, and the pad 46 are not limited to two locations, and any configuration may be used as long as a pressing force is applied evenly to the rotary knob.

The braking force adjusting mechanism for a rotary knob according to the present invention can be employed not only for wireless communication devices but also for rotary knobs of various electronic devices.

1 is a perspective view of a wireless communication device adopting an embodiment of a braking force adjusting mechanism for a rotary knob according to the present invention. 2A and 2B are detailed views around the rotary knob in a state where the braking force is weakened. FIG. 2A is a detailed view seen from the back side, and FIG. 2B is a cross-sectional view taken along line AA in FIG. It is. 3A and 3B are explanatory diagrams for explaining the operation of the main part of FIG. 2, in which FIG. 3A is an explanatory diagram in a state where the braking force is intermediate, FIG. 3B is an explanatory diagram in a state where the braking force is weak, FIG. (C) is explanatory drawing of a state with strong braking force. FIG. 4A is a detailed view around the rotary knob in a state where the braking force is strengthened, FIG. 4A is a detailed view seen from the back side, and FIG. 4B is a cross-sectional view taken along line AA in FIG. It is. FIG. 5A is a detailed plan view of the fixing plate, FIG. 5A is a plan view of a single body, and FIG.

Explanation of symbols

1 Wireless communication device 2 Operation panel 3 Rotation knob
31 groove
32 Inner wall 4 Braking force adjustment mechanism of rotary knob
42 Fixed plate
45 arms
46 Pad, pressing member
51 Rotating plate
52 Cam
52a Small diameter part
52b Expanded part
53 articulated arms
54 Tip
55 Suspension arm
56 Suspension protrusion
57 Uneven groove 6 Operation slide body
61 holes
62 Operation convex part
42, 45, 51, 52, 53, 54, 6, 61 Adjusting means
42, 45, 51, 52, 53, 54, 61 Connecting means

Claims (2)

A pressing member for pressing the rotary knob in the radial direction;
Adjusting means for adjusting the pressure of the pressing member according to the amount of operation applied from the outside;
The pressing member is
The inner wall surface formed on the back side of the rotary knob is configured to press radially from the shaft core,
The adjusting means is
An operation slide disposed below the rotary knob;
A connecting means for applying a pressing force according to the position of the operating slide body to the pressing member;
In the braking force adjustment mechanism of the rotary knob
The connecting means includes
A rotating plate that rotates according to the slide amount of the operation slide body;
A fixed plate for applying a pressing force to the pressing member according to the rotation angle of the rotating plate;
With
The rotating plate is formed with a cam portion having a different radius on the outer periphery,
The fixed plate includes an arm extending into a groove formed on the back surface of the rotary knob,
By expanding the cam portion formed on the rotating plate according to the slide amount of the operation slide body, the pressing member at the tip of the arm formed on the fixed plate is placed on the inner wall surface of the groove. A mechanism for adjusting the braking force of the rotary knob, wherein the mechanism is configured to adjust the braking effect against the rotation operation of the rotary knob by pressing . 2. The braking force of the rotary knob according to claim 1, further comprising a holding unit that holds at least one of the pressing member, the operation slide body, and the rotary plate at a position corresponding to the operation amount. Adjustment mechanism.