JP2008047449A - Torque adjustment device of rotary knob - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a mechanism where a torque adjustment range is set to be limited in a predetermined range and the operation of a torque adjustment knob is stable, in a torque adjustment device of a rotary knob. <P>SOLUTION: In a state where a sleeve part 42-2 of the rotary knob 40 is fitted to a hollow pipe part 51 of the torque adjustment knob 50, and a plurality of small projections formed on an annular end surface of the rotary knob 40 are respectively brought into contact with a plurality of inclined surfaces formed on an annular groove 52 on the circumferential side of the torque adjustment knob 50, both the knobs 40 and 50 are connected to each other through an elastic part 90 by a holder bracket 80, and the assembly thereof is mounted to a rotary shaft 31 of an operation object component 30 through a cap 60 and an elastic part 70. Although a compression amount of the elastic part 70 is changed by a relative rotating angle of both the knobs 40 and 50 to increase/decrease the rotating torque of the rotary knob 40, a leg part of the holder bracket 80 can turn only in a circumferential opening region of the torque adjustment knob 50, whereby the torque adjustment range is limited. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a device for freely increasing / decreasing the rotational torque of a rotary knob that operates components such as a rotary encoder and a variable resistor mounted on an electronic device.

Many electronic devices have built-in parts that perform delicate adjustments by turning operation. For example, in the case of a wireless communication device, the built-in parts can be operated by operating the turning knob on the main dial. The operating frequency is set by adjusting the rotation angle of the rotary encoder shaft.
And in such a rotary knob that requires fine adjustment of the angle, the actual operational feeling is extremely important, and the presence of a moderate rotational torque provides a stable manual feeling and a fine angle. It is supposed to be easy to set up.

For this reason, as can be seen in Patent Documents 1 and 2 below, a rotating torque adjusting device using various methods has been devised for the rotating knob.
Here, in Patent Document 1, as shown in FIG. 7, “a first knob 103 detachably fixed to a distal end portion of a driven shaft 102 protruding outside the panel 101 and the first knob. The elastic plate 104 is detachably fixed to the surface of the panel 101 and is open toward the surface of the panel 101. The elastic plate 104 is formed in a substantially U shape, and the elastic plate 104 faces the surface of the panel 101. A friction plate 105 fixed to the front end of each of the first and second holes 106 having a radius that changes in accordance with the rotation angle, and is inserted between the elastic plate 104 and the first knob 103, and A torque variable knob device including a second knob 107 into which a part of the first knob 103 is inserted, and changing the relative position between the first knob 103 and the second knob 107 to make the torque variable. is suggesting.
According to this device, the hole 106 of the second knob 107 has an elliptical shape, and when the second knob 107 is rotated with the first knob 103 fixed, the hole is formed at the position of the elastic plate 104. The radius of 106 changes. For example, the radius of the hole 106 in the state shown in FIG. 7A becomes smaller in the state shown in FIG. 7B after the second knob 107 is rotated.
Thereby, the elastic plate 104 is pressed downward, the angle is changed, and the friction plate 105 is strongly pressed against the surface of the panel 101, and the friction between the surface of the panel 101 and the friction plate 105 is increased, The rotational torque of the first knob 103 is increased.

Further, in Patent Document 2, as shown in FIG. 8, “a knob 113 attached to the front end of the driven shaft 112 protruding outward from the panel 111 and the driven shaft peripheral portion on the surface of the panel 111. And a protrusion 115 that is supported rotatably and slides on the inclined portion 114 and protrudes toward the knob 113 and elastically presses the knob 113. A lever 117 and an elastic member 118 that is disposed between the lever 117 and the knob 113 and presses the lever 117 toward the panel 111 are provided. When the lever 117 is rotated, the protruding piece 116 of the lever 117 There has been proposed a torque variable mechanism for a knob configured such that the pressing force with the knob 113 changes to change the torque.
According to this mechanism, when the lever 117 is rotated from the state shown in FIG. 8A, the protrusion 115 rides up along the inclined portion 114 on the surface of the panel 111, thereby compressing the elastic member 118 and projecting pieces. 116 moves to the knob 113 side.
As shown in FIG. 8B, the projection 115 is engaged with the recess 119, but pressing the knob 113 through the friction plate 120 increases the frictional force on the knob 113. The rotational torque increases.

Furthermore, a configuration as shown in FIG. 9 is also implemented as a torque adjusting device for a rotary knob by a method that does not use the panel surface.
In the figure, 121 is a panel, 122 is a component mounting board, 123 is a rotary encoder which is an operated component, 124 is a rotary knob, 125 is a torque adjustment knob, 126 is a cap, 127 is a wave washer between flat washers. It is the elastic part comprised by interposing.

The rotary encoder 123 is attached by screwing a shaft support portion 123b of the rotating shaft 123a to the component mounting board 122. The rotating shaft 123a projects forward through a hole 121a formed in the panel 121. A cap 126 is externally fitted to the support 123b so as to cover the front end surface and the outer peripheral surface near the front.
The rotary knob 124 is composed of a hollow cylindrical main body portion 124a whose front surface is closed and a weight 124b which is fitted and bonded inside. The weight 124b includes a disc portion 124c and a sleeve portion 124d, and a through hole is formed through which the rotating shaft 123a of the rotary encoder 123 is inserted through the sleeve portion 124d.
In addition, a male screw is formed on the outer peripheral surface of the sleeve portion 124d, and a lateral hole 124e that reaches the through hole from the side peripheral surface of the disc portion 124c through the wall thickness (a section near the through hole is a screw hole) 124e. Is formed. A hole 124f is also formed at a position corresponding to the hole 124e of the disk portion 124c in the main body portion 124a.
The torque adjustment knob 125 has a disk-like shape in which the opening end of the rotation knob 124 is shallowly fitted on one side, and the outer wall of the annular recess 125a is configured as an operation ring portion 125b. ing. Further, a sleeve portion 125c is formed at the center of the torque adjustment knob 125, and an internal thread is formed on the inner peripheral surface of the sleeve portion 125c to be engaged with the external thread of the sleeve portion 124d on the weight 124b side.

  Based on the above-described configuration of each element, the cap 126 is fitted on the pivotal support 123b of the rotary encoder 123, and the flat washer, the wave washer, and the flat washer are sequentially fitted on the rotating shaft 123a to thereby attach the elastic portion 127. In the state where the male screw of the sleeve portion 124d of the rotary knob 124 and the female screw of the sleeve portion 125c of the torque adjustment knob 125 are engaged with each other, the rotary shaft 123a of the rotary encoder 123 is connected to the sleeve of the rotary knob 124. Insert into the part 124d. Then, when the rotation shaft 123a of the rotary encoder 123 is fixed to the rotation knob 124 by inserting and tightening the screw pin 124g through the holes 124f and 124e of the rotation knob 124, the structure after assembly as shown in FIG. It becomes.

In this rotating knob torque adjusting device, when the rotating knob 124 is rotated, the rotating knob 124 rotates together with the torque adjusting knob 125, but between the wave washer and the flat washer of the elastic portion 127 or between the elastic portion 127 and the cap 126 or torque. A rotation torque is applied to the rotation knob 124 by the rotation friction resistance generated in the adjustment knob 125.
The magnitude of the rotation torque is adjusted by the screwed state between the sleeves 124d and 125c of the rotation knob 124 and the torque adjustment knob 125.
That is, when the torque adjustment knob 125 is rotated while gripping the rotation knob 124 so as not to rotate, the torque adjustment is performed while the rotation knob 124 is fixed to the rotation shaft 123a of the rotary encoder 123. Since the knob 125 moves in the axial direction while rotating, the compression state of the elastic portion 127 can be changed by changing the distance between the torque adjustment knob 125 and the cap 126, and as a result, the rotation knob 124 is operated. It is possible to increase or decrease the magnitude of the rotational torque when

Japanese Utility Model Publication No. 61-126322 JP-A-6-202747

By the way, in the rotation torque adjusting device of Patent Document 1, since the surface roughness of the panel 101 greatly affects the magnitude of the rotation torque, special processing for the panel 101 is often required. In addition, since the surface state (coefficient of friction) of the panel 101 changes due to humidity or the like, even if the rotation torque of the first knob 103 is adjusted and set by the second knob 107, the operating environment and weather of the device There is a problem that the rotational torque changes due to the above.
Also in the rotating torque adjusting mechanism of Patent Document 2, the back side of the knob 113 is a friction surface for generating rotating torque, and there is a problem similar to that of Patent Document 1, and the panel. It is necessary to form the inclined part 114, the recessed part 119, etc. with respect to the surface of 111. FIG.

On the other hand, in the torque adjusting device for the rotary knob shown in FIG. 9, since the mechanism is concentrated on the rotary shaft 123a by using the shaft support portion 123b of the rotary encoder 123, the panel 121 and the component mounting board 122 are rotated. The elastic portion 127 that is not involved in the generation of dynamic torque and that generates rotational torque has a compact configuration in which a wave washer is interposed between flat washers. There are no disadvantages seen with adjustment devices and mechanisms.
However, the screwing relationship between the sleeve portions 124d and 125c on the rotation knob 124 side and the torque adjustment knob 125 side is elastic when viewed in the direction of tightening the torque adjustment knob 125 (the direction in which the elastic portion 127 is compressed). Even if the portion 127 is compressed to the limit, it can be rotated further. If the portion 127 is excessively rotated, a large force in the pulling direction acts on the rotating shaft 123a of the rotary encoder 123 and is damaged. there is a possibility.
Further, since the rotation knob 124 and the torque adjustment knob 125 are connected only by the screwing relationship of the sleeve portions 124d and 125c in the central portion, the torque adjustment knob 125 that should be perpendicular to the rotation shaft 123a. There is a tendency that the angle tends to become unstable, and there is a problem that the operability is deteriorated by tilting when rotating.

  Therefore, the present invention can solve the problems of the prior art shown in FIG. 9 reasonably, and does not perform an unreasonable operation that causes damage to the rotating operation parts, and has excellent operability. It was created for the purpose of providing a torque adjustment device for a knob.

  According to the present invention, the first annular elastic portion and the torque adjustment knob are disposed between the front end surface of the shaft support portion of the rotation shaft in the operated part and the rotation knob fixed to the tip end side of the rotation shaft. An adjustment operating mechanism that is externally fitted to the dynamic shaft and changes the axial position of the torque adjustment knob relative to the rotation knob in accordance with the relative rotation angle of the rotation knob and the torque adjustment knob. A torque adjustment device for a rotary knob that adjusts the torque required for the rotary operation of the rotary knob by changing the relative rotation angle to increase or decrease the rotary friction of the first annular elastic portion. The rotating knob is formed with a sleeve portion for projecting the rotating shaft of the operated part at an axial center position opposite to the torque adjusting knob, and the same on the annular end surface of the outer peripheral wall portion. At the central angle Each of the torque adjustment knobs has a hollow cylindrical portion that is externally fitted to the sleeve portion on the rotating knob side. An intermediate plate between the hollow cylindrical portion and the circumferential surface is formed on the circumferential surface where the protrusions on the rotating knob side are in sliding contact with each other, with the same inclined surface being formed for each section by the central angle. In the surface area, each mounting leg portion of the holder bracket, which will be described later, has a configuration in which each opening area that secures a circumferential distance by which a predetermined center angle can be swung is formed, and an annular plate portion and a plurality of mounting leg portions, The holder plate is formed by engaging between the hollow cylinder portion of the torque adjustment knob and the opening regions via the second annular elastic portion by the annular plate portion, and the mounting leg portions are Pass through each open area By being fixed to the knob side, according to the torque regulating device of the rotating knob which is characterized by being configured the rotation knob and the adjustment actuation mechanism coupled to the torque adjustment knob.

The adjusting operation mechanism in the torque adjusting device for the rotary knob of the present invention operates as follows.
The rotation knob and the torque adjustment knob have a fitting relationship between the sleeve portion and the hollow cylindrical portion around the rotation axis of the operated part, and each protrusion formed on the annular end surface and each inclination formed on the circumferential surface. Each contact pressure is a repulsion corresponding to the compression amount of the second annular elastic portion when the rotary knob and the torque adjustment knob are connected by the holder bracket. It is supplied by force.
Therefore, when the relative rotation angle of the rotation knob and the torque adjustment knob changes, the height of the protrusion of the annular end surface on each inclined surface changes, and the separation distance of the torque adjustment knob with respect to the rotation knob is changed. Increase or decrease.
In this case, since the rotation knob is fixed to the rotation shaft, the first annular elastic portion is compressed between the hollow cylindrical portion of the torque adjustment knob and the shaft support portion of the rotation shaft in the operated part, and the first A repulsive force corresponding to the change in the relative rotation angle is generated in the annular elastic portion.
When the turning knob is turned, the turning torque acting on the torque adjusting knob from the turning knob is larger than the reaction torque acting on the torque adjusting knob from the first annular elastic portion. The adjustment knob rotates as a unit, but the repulsive force generated in the first annular elastic portion increases the turning torque of the torque adjustment knob with respect to the shaft support portion of the operated part. A constant load torque is supplied during the dynamic operation.
Further, according to the present invention, the holder bracket mounting leg fixed to the rotating knob side can be turned only within each opening region formed in the torque adjusting knob.
Therefore, the relative rotation angle between the rotary knob and the torque adjustment knob is limited to a predetermined range, and the rotary torque of the rotary knob is set to the maximum value and the minimum value within that range. For example, if the range of the relative rotation angle is set to a range in which the protrusion on the rotation knob side can move from the lowest position to the highest position of the circumferential inclination surface on the torque adjustment knob side, the entire inclined surface is used. A torque adjustment mechanism can be realized.

In the present invention, the front end surface of the pivotal support portion of the rotating shaft in the operated component is used. However, when the area of the annular region is small, the contact condition with the first annular elastic portion is deteriorated. In such a case, it is desirable to secure a good contact condition by fitting a cap that covers the front end surface and the outer peripheral surface of the shaft support portion of the rotation shaft.
In addition, a single wave washer or a laminated structure of a flat washer, a wave washer, and a flat washer can be applied to the first annular elastic portion in the present invention, and a single wave washer can be applied to the second annular elastic portion.
Furthermore, if the outermost peripheral portion of the torque adjustment knob is configured as an operation ring portion that covers the rear outer peripheral surface of the rotation knob, the protrusion of the rotation knob can be made invisible from the outside and the adjustment operation can be performed. Will also be easier.

According to the torque adjustment device for the rotary knob of the present invention, the sleeve portion of the rotary knob and the hollow cylindrical portion of the torque adjustment knob are in a fitting relationship, and the protrusions on the rotary knob side are inclined on the torque adjustment knob side. Since the adjustment operating mechanism is configured in a connected state in which the surface is in contact with a position corresponding to the same height, a stable shaft support state of the torque adjustment knob can be ensured, and its excellent operability can be realized.
In addition, the relative rotation angle of the rotary knob and the torque adjustment knob is mechanically limited to a certain range, and the lower limit to the upper limit of the rotary torque of the rotary knob is set by the angle of the inclined surface within that range. As in the prior art (FIG. 9), there is no case where an excessive pulling force is applied to the rotating shaft of the operated part to be damaged.
Furthermore, since the lower limit and the upper limit of the rotational torque can be changed by the configuration of the inclined surface formed on the torque adjustment knob, there is an advantage that the degree of freedom in design is great.

Hereinafter, an embodiment of a “torque adjusting device for a rotating knob” according to the present invention will be described with reference to FIGS. 1 to 6.
1A is a front view of a main dial mounting portion in a wireless communication device, FIG. 1B is a cross-sectional view taken along line XX in FIG. 1A, and FIG. 2 is Y in FIG. -Y arrow sectional drawing, FIG. 3 is an exploded perspective view of each element which comprises a main dial.
In each figure, 10 is a panel, 20 is a component mounting board, 30 is a rotary encoder which is an operated component, 40 is a rotation knob, 50 is a torque adjustment knob, 60 is a cap, 70 is an elastic portion, 80 is a holder bracket, 90 is a wave washer.

  Here, the panel 10, the component mounting board 20, the rotary encoder 30, the cap 60, and the elastic portion 70 are the same as the corresponding elements in the apparatus of the prior art (FIG. 9), and the method of assembling them is also the same. It is the same. That is, the rotary encoder 30 is attached by fixing the shaft support portion 32 of the rotating shaft 31 to the component mounting board 20 by screwing, and the rotating shaft 31 protrudes forward through the hole 11 formed in the panel 10. At the same time, a cap 60 is fitted to the shaft support portion 32 so as to cover the front end surface and the outer peripheral surface near the front. As shown in FIG. 3, the elastic portion 70 in this embodiment has a structure in which two flat washers 71, a wave washer 72, and two flat washers 73 are laminated. One by one may be used.

The mechanical feature of this embodiment is the connection relationship between the rotary knob 40 and the torque adjustment knob 50.
As shown in the cross-sectional view of FIG. 4A and the rear view of FIG. 4B, the rotary knob 40 has a hollow cylindrical main body 41 with one end closed and a weight 42 fitted therein. This point is the same as the rotating knob 124 of the prior art (FIG. 9). However, studs 43-1 and 4 used for fixing the weight 42 are erected and formed inside the main body 41, and the weight 42 has holes 44- at positions corresponding to the studs 43-1 and 43-2. 1 and 2 are formed. The weight 42 is fixed to the main body 41 when the torque adjustment knob 50 is attached to the rotation knob 40 using the holder bracket 80 as will be described later.

A characteristic configuration of the rotary knob 40 of this embodiment is that small protrusions 46-1, 2, and 3 are formed on the opening side end face 45 of the main body portion 41 at every 120 ° central angle. The height H of the small protrusions 46-46-1, 2, 3 is set to be larger than the maximum height Δh of each inclined section 57-1, 2, 3 of the torque adjustment knob 50 described later.
Further, the point that the weight 42 is composed of the disc part 42-1 and the sleeve part 42-2 is the same as that of the prior art (FIG. 9). However, as will be described later, the sleeve part 42-2 is the rotary encoder 30. And the hollow cylindrical portion 51 of the torque adjustment knob 50 are externally fitted, and no external thread is formed on the outer peripheral surface thereof as in the prior art (FIG. 9). .

Next, the detailed configuration of the torque adjustment knob 50 is shown in FIG. 5A is a plan view, FIG. 5B is a cross-sectional view, and FIG. 5C is a cross-sectional view of a circumferential section S1-S2 indicated by an arrow in FIG.
A hollow cylindrical portion 51 into which the sleeve portion 42-2 on the rotation knob 40 side is fitted is formed at the center portion, and the opening side end surface of the rotation knob 40 is concentrically formed with the hollow cylinder portion 51 on the outer peripheral side. An annular groove 52 into which 45 is fitted is formed, and an outer peripheral side wall thereof is an operation ring portion 53.
The hollow cylindrical portion 51 and the inner peripheral side wall of the annular groove 52 are formed as a flat plate portion 54. The arc-shaped slit portion and the square hole portion are spaced apart from the hollow cylindrical portion 51 by a certain distance. A pair of opening regions 55-1 and 2 are formed in a point-symmetrical positional relationship.

  Further, the bottom of the annular groove 52 is not a flat surface, and there are horizontal sections 56-1, 2, 3 corresponding to a central angle of 10 ° at intervals corresponding to a central angle of 120 ° in the circumferential direction. Between these horizontal sections 56-1, 2, 3 (corresponding to a central angle of 110 °) is formed as an inclined section [hatched portion in FIG. 5A] 57-1, 2, 3. More specifically, as shown in FIG. 5C, each of the inclined sections 57-1, 2, and 3 is formed with an inclined surface that increases by Δh during a circumferential distance corresponding to 110 ° in the central angle. ing.

The rotary knob 40 and the torque adjustment knob 50 having such a configuration are rotated in front of a cap 60 fitted to the shaft support portion 32 of the rotary encoder 30 as shown in FIGS. The moving shaft 31 is assembled as an axis.
First, the weight 42 is fitted into the main body portion 41 of the rotary knob 40, and the hollow cylindrical portion 51 of the torque adjusting knob 50 is fitted onto the sleeve portion 42-2 of the weight 42.
Then, the wave washer 90 is fitted on the hollow cylindrical portion 51 of the torque adjustment knob 50, and the rotation knob 40 and the torque adjustment knob 50 are connected by the holder bracket 80.

Here, the holder bracket 80 includes an annular plate portion 81 that is externally fitted to the hollow cylindrical portion 51 of the torque adjustment knob 50, and L-shaped mounting leg portions 82-1 that are formed at symmetrical positions with respect to the center thereof. In the state where the vicinity of the hollow cylindrical portion 51 of the torque adjusting knob 50 is engaged with the annular plate portion 81 via the wave washer 90, the rotating knob 40 is moved by the mounting leg portions 82-1 and 82. Screwed to the side.
More specifically, the mounting leg portions 82-1 and 2 of the holder bracket 80 are inserted into the weight 42 side of the rotary knob 40 through the rectangular hole portions of the opening regions 55-1 and 2 of the torque adjustment knob 50. The holes formed in the mounting legs 82-1 and 82-2, the holes 44-1 and 44-2 of the weight 42 on the rotating knob 40 side, and the studs 43-1 and 43-2 of the main body 41 are formed. The rotation knob 40 and the torque adjustment knob 50 are connected by inserting and fastening the screws 83-1 and 8 in a state where the screw holes are aligned on one axis.

  By the way, in the assembled state after the screws 83-1 and 2 are fastened, the small protrusions 46-1, 2 and 3 of the rotary knob 40 are located at the bottom of the annular groove 52 of the torque adjusting knob 50 (this embodiment). , The abutting pressure is applied by the repulsive force of the wave washer 90 compressed by fastening the screws 83-1, 2. That is, at the mechanism design stage, the contact pressure in the assembled state is set in advance so as to have an appropriate magnitude, whereby the bias rotation between the rotation knob 40 and the torque adjustment knob 50 is performed. Torque is set.

Next, an assembly in which the rotary knob 40 and the torque adjustment knob 50 are connected is attached to the rotary shaft 31 of the rotary encoder 30 attached to the component mounting board 20.
As described above, the cap 60 is fitted on the shaft support portion 32 of the rotary encoder 30, and the rotating shaft 31 protrudes forward through the hole 11 formed in the panel 10. The rotating shaft 31 is inserted into the sleeve 42-2 of the rotating knob 40 in the assembled state and pushed into the weight 42.

And it is formed in the disk part 42-1 of the side wall of the main-body part 41, and the weight 42 in the natural state which does not apply a load to the elastic part 70, or the state compressed lightly, as shown in FIG. The screw pin 49 is inserted through each of the holes 47 and 48, and the screw pin 49 is screwed into the female screw formed in the hole 48 of the disc portion 42-1 to fix the rotating shaft 31 of the rotary encoder 30. .
When the attachment of the assembly is completed in this way, the details of the connecting portion of the assembly and the interposed portion of the elastic portion 70 at that stage are as shown in FIG. 6, and the hollow cylindrical portion 51 of the torque adjusting knob 50 is The elastic part 70 is interposed between the end face and the cap 60 fitted on the shaft support part 32 of the rotary encoder 30, and the end face of the sleeve part 42-2 of the rotary knob 40 is slightly separated from the elastic part 70. It has become.
When the screw pin 49 is used for fixing, a part of the rotating shaft 31 is cut out flat, and the tip of the screw pin 49 is strongly pressed against the flat portion.

  After the assembly of the rotary knob 40 and the torque adjusting knob 50 to the rotary shaft 31 of the rotary encoder 30 is attached, the assembly between the rotary knob 40 and the torque adjusting knob 50 and between the assembly and the rotary encoder 30 are also shown. The rotation torque between the assembly and the rotary encoder 30 is increased or decreased by the rotation angle between the rotation knob 40 and the torque adjustment knob 50. The

First, when the operation knob 53 of the torque adjustment knob 50 is rotated rightward with the other hand while the rotation knob 40 is held without being rotated with one hand, As shown in FIG. 5C, the small protrusions 46-1, 2, 3 slide in the inclined sections 57-1, 2, 3 formed in the annular groove 52 of the torque adjusting knob 50. I will get on.
Therefore, the rotary knob 40 and the torque adjusting knob 50 are separated in the axial direction by the height of the small protrusions 46-1, 2, 3 riding on the inclined sections 57-1, 2, 3 of the small protrusions 46-1, 2, 3. The rotary knob 40 is fixed to the rotary shaft 31 of the rotary encoder 30 as described above. Since the rotary knob 40 itself cannot move in the axial direction, the torque adjusting knob 50 is provided with the shaft support portion 32 of the rotary encoder 30. Move to the side.

On the other hand, since the elastic portion 70 is interposed between the cap 60 fitted on the shaft support portion 32 of the rotary encoder 30 and the torque adjustment knob 50, the torque adjustment knob 50 is elastic by the amount of movement. And the repulsive force by the wave washer 72 is increased.
In this case, as in the case of the prior art (FIG. 9), the elastic portion 70 has a laminated structure of a flat washer 71, a wave washer 72, and a flat washer 73, so that the torque adjustment knob 50 and the shaft support portion of the rotary encoder 30 are used. A rotating torque variable mechanism by sliding friction is configured between the two, and the sliding friction is proportional to the repulsive force of the wave washer 72 due to the compression of the elastic portion 70.
Therefore, the rotational torque of the torque adjustment knob 50 relative to the shaft support portion 32 side of the rotary encoder 30 depends on the rotation angle of the torque adjustment knob 50 relative to the rotation knob 40.

  Then, between the rotary knob 40 and the torque adjustment knob 50, the small protrusions 46-1, 2, 3 and the annular groove 52 of the torque adjustment knob 50 are brought into contact with each other based on the repulsive force of the wave washer 90. Since there is a predetermined rotational friction at the contact point, and each contact point is at a position far away from the rotation center, the torque adjustment knob 50 is rotated from the rotation knob 40 when the rotation knob 40 is rotated. Is larger than the reaction torque via the elastic portion 70 between the torque adjustment knob 50 and the cap 60. When the rotation knob 40 is rotated, the torque adjustment knob 50 is also integrated. Rotate.

In the case of this embodiment, when the torque adjusting knob 50 is rotated clockwise with respect to the rotating knob 40 as described above, the rotating torque can be increased, and conversely, when rotated counterclockwise, the torque can be decreased. As is clear from FIGS. 4 and 5, the relative rotation angle between the rotation knob 40 and the torque adjustment knob 50 is in the range of 0 ° to 120 °.
Therefore, in the state of 0 ° (the state in which the small protrusions 46-1, 2, 3 of the rotary knob 40 are in the horizontal sections 56-1, 2, 3 of the torque adjusting knob 50), the elastic portion 70 is unloaded or Since the rotary knob 40 is lightly compressed, the rotary knob 40 can be rotated with a small rotation torque, but the 120 ° state (the small protrusions 46-1, 2, 3 of the rotary knob 40 are the torque adjustment knobs 50). In the state where the elastic section 70 is compressed by Δh from a no-load or light compression state, a large rotation is required to rotate the rotary knob 40. Torque is required, and by setting the intermediate angle as a matter of course, a desired rotational torque can be set.

In the case of this embodiment, as described above, the relative rotation angle between the rotation knob 40 and the torque adjustment knob 50 is set in the range of 0 ° to 120 °, and the mechanism is further rotated mechanically. I can't do that.
That is, as shown in FIG. 1B, the holder bracket 80 has the torque adjustment knob 50 attached to the rotary knob 40, but as shown in FIG. The parts 82-1 and 2 pass through the respective opening regions 55-1 and 2 of the torque adjustment knob 50 and are screwed to the rotation knob 40 side, and the torque adjustment knob 50 rotates relative to the rotation knob 40. When the angle is out of the range of 0 ° to 120 °, the rotation of the mounting legs 82-1 and 2 is restricted by the hole walls of the opening regions 55-1 and 2.
Therefore, unlike the prior art (FIG. 9), the torque adjustment knob 125 is not excessively rotated and the rotary encoder 123 is not damaged, and the torque that maximizes / minimizes the rotation torque of the rotation knob 40. The rotational position of the adjustment knob 50 can be easily confirmed, and the optimum operating state of the rotational torque can be quickly set.

Furthermore, in the case of this embodiment, the sleeve portion 42-2 of the rotary knob 40 is externally fitted to the rotary shaft 31 of the rotary encoder 30, and further torque is applied to the sleeve portion 42-2. The hollow cylindrical portion 51 of the adjustment knob 50 is fitted externally, and the small protrusions 46-1, 2, 3 on the opening side end face 45 of the rotary knob 40 are the bottom surfaces (horizontal) of the annular groove 52 of the torque adjustment knob 50. The section 56-1, 2, 3 or the inclined section 57-1, 2, 3) is always in contact with the same condition.
Therefore, as compared to the case where the sleeve portions 124d and 125c on the rotation knob 124 side and the torque adjustment knob 125 side are in a screwed relationship as in the prior art (FIG. 9), the board surface of the torque adjustment knob 50 is compared. Is always maintained in a vertical relationship with respect to the rotary shaft 31 of the rotary encoder 30, and the operation ring portion 53 is inclined in an unstable manner when the torque adjustment knob 50 is operated to adjust the rotary torque. There are no defects and good operability can be obtained.

In this embodiment, the wave washers 72 and 90 are used as the elastic member of the elastic portion 70 and the elastic member between the holder bracket 80 and the torque adjusting knob 50, but a bending washer or a disc spring may be used. Good.
As for the elastic portion 70, if a sufficient contact area between the end surface of the hollow cylindrical portion 51 on the torque adjusting knob 50 side and the end surface of the cap 31 on the rotary encoder 30 side can be secured, the flat washer 71, The wave washer 72 alone may be used without using 72.
Furthermore, in this embodiment, the cap 31 is fitted on the shaft support portion 32 of the rotary encoder 30. However, when the outer diameter of the shaft support portion 32 is larger than the outer diameter of the wave washer 72, the cap 31 is not necessarily attached. There is no need to use it.

  The present invention is applied to a knob of a rotating operation component mounted on an electronic device such as a wireless communication device.

(A) is a front view of the main dial attachment part of the radio | wireless communication apparatus which concerns on embodiment of this invention, (B) is XX arrow sectional drawing in (A). It is a YY arrow sectional view in Drawing 1 (A). It is a disassembled perspective view of each element which comprises a main dial. (A) is sectional drawing of a rotation knob, (B) is the back view. (A) is a plan view of the torque adjustment knob, (B) is a sectional view thereof, and (C) is a sectional view of a circumferential section S1-S2 in (A). It is an expanded sectional view of the connection part of a rotation knob and a torque adjustment knob, and the interposed part of an elastic part. It is sectional drawing of the torque adjustment apparatus of the rotation knob which concerns on a prior art (patent document 1), (A) shows the state which does not give rotation torque, (B) shows the state which gave rotation torque. It is sectional drawing which shows the torque adjustment mechanism (patent document 2) of the conventional rotation knob, (A) shows the state which does not give rotation torque, (B) shows the state which gave rotation torque. It is sectional drawing which shows the torque adjustment apparatus of the conventional rotation knob which this invention made the improvement object.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Panel, 11 ... Hole, 20 ... Component mounting board, 30 ... Rotary encoder, 31 ... Rotary shaft, 32 ... Shaft support part, 40 ... Rotary knob, 41 ... Main-body part, 42 ... Weight, 42-1 ... Circle Plate part, 42-2 ... Sleeve part, 43-1, 2 ... Stud, 44-1, 2 ... Hole, 45 ... Open side end face, 46-1, 2, 3 ... Small projection, 47 ... Hole, 48 ... Hole , 49 ... Screw pin, 50 ... Torque adjustment knob, 51 ... Hollow cylindrical part, 52 ... Annular groove, 53 ... Operation ring part, 54 ... Flat plate part, 55-1, 2 ... Opening region, 56-1, 2, 3 ... Horizontal section, 57-1, 2, 3 ... Inclined section, 60 ... Cap, 70 ... Elastic part, 71 ... Flat washer, 72 ... Wave washer, 73 ... Flat washer, 80 ... Holder bracket, 81 ... Annular plate part, 82-1 and 2 ... mounting legs, 83-1 and 2 ... screws, 90 ... wave washer, 101 ... panel, 102 ... covered Moving shaft, 103 ... first knob, 104 ... elastic plate, 105 ... friction plate, 106 ... hole, 107 ... second knob, 111 ... panel, 112 ... driven shaft, 113 ... knob, 114 ... tilted portion, DESCRIPTION OF SYMBOLS 115 ... Projection, 116 ... Projection piece, 117 ... Lever, 118 ... Elastic member, 121 ... Panel, 122 ... Component mounting board, 123 ... Rotary encoder, 123a ... Rotating shaft, 123b ... Shaft support, 124 ... Rotation knob, 124a ... Main body part, 124b ... Weight, 124c ... Disk part, 124d ... Sleeve part, 124e ... Hole, 124f ... Hole, 124g ... Screw pin, 125 ... Torque adjustment knob, 125a ... Round recess, 125b ... Operating ring part, 125c ... Sleeve part, 126 ... Cap, 127 ... Elastic part.

Claims (4)

A first annular elastic portion and a torque adjustment knob are outside the rotation shaft between a front end surface of the pivot support portion of the rotation shaft in the operated part and a rotation knob fixed to the distal end side of the rotation shaft. And an adjustment operation mechanism that changes an axial position of the torque adjustment knob with respect to the rotation knob according to a relative rotation angle of the rotation knob and the torque adjustment knob. In a torque adjustment device for a rotary knob that adjusts the torque required for the rotary operation of the rotary knob by changing the relative rotation angle to increase or decrease the rotary friction of the first annular elastic portion,
The rotating knob has a sleeve portion that projects the rotating shaft of the part to be operated at an axial center position opposite to the torque adjusting knob, and has the same center on the annular end surface of the outer peripheral wall portion. It has a configuration in which protrusions are formed at a plurality of positions divided by corners,
On the other hand, the torque adjustment knob has a hollow cylindrical portion that is fitted around the sleeve portion on the rotating knob side at the center, and the circumferential surface on which the protrusions on the rotating knob side are in sliding contact with each other, The same inclined surface is formed for each section section by the central angle, and each mounting leg portion of the holder bracket described later has a predetermined central angle in the intermediate plate surface area between the hollow cylindrical portion and the circumferential surface. Each opening region has a configuration in which a circumferential distance that can be swiveled is secured,
Using a holder bracket composed of an annular plate portion and a plurality of mounting legs, the annular plate portion engages between the hollow cylindrical portion of the torque adjustment knob and each opening region via the second annular elastic portion. In addition, each of the mounting leg portions passes through each of the opening regions and is fixed to the rotating knob side, thereby connecting the rotating knob and the torque adjusting knob to constitute the adjusting operation mechanism. A torque adjusting device for a rotary knob.   The torque adjusting device for a rotary knob according to claim 1, wherein a cap that covers a front end surface and an outer peripheral surface of the rotary shaft of the operated part is fitted on the shaft support portion of the operated part.   3. The first annular elastic portion is constituted by a single wave washer or a structure in which a flat washer, a wave washer, and a flat washer are laminated, and the second annular elastic portion is constituted by a single wave washer. Torque adjustment device for the rotary knob. 4. The torque adjustment device for a rotary knob according to claim 1, wherein the outermost peripheral portion of the torque adjustment knob is configured as an operation ring portion that covers a rear-side outer peripheral surface of the rotary knob.

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