JP2001284105A - Rotary knob mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotary knob mechanism, capable of being simply and surely fixedly engaged, without requesting a high accuracy in a dimensional accuracy and simply drawing and removing a rotary knob. SOLUTION: An engaging hole 21c, cut out at one end, is provided at one end of a cylindrical shaft 21b of a rotary knob 21 in the rotary knob mechanism 20. An engaging protrusion 23b and a locking part 23c are provided on the outer periphery of a shaft member 23. A rod member 28 is disposed near a shaft member 2. In this case, when the knob 21 is rotated in a prescribed direction in a state, in which the protrusion 23b of the shaft member is engaged with the hole 21c of the knob, the part 23c of the member 23 is made to contact the member 28. The rotation of the member 23 is prevented. Furthermore, when the knob 21 is rotated in a predetermined direction, the protrusion 23b of the shaft member is locked to a locking position 21c-2 of the hole 21c of the knob. Thus the knob 21 is fixed to the member 23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary knob provided with an engagement hole with one end cut out at an end of a cylindrical shaft portion, and an outer peripheral portion of the shaft member for engaging with the engagement hole. When the rotation knob is rotated in a predetermined direction in a state where the engagement protrusion and the engagement portion extending in the radial direction are provided, and the engagement protrusion of the shaft member is engaged with the engagement hole of the rotation knob, the shaft member When the locking portion of the shaft abuts against the rotation preventing member, the rotation of the shaft member is prevented, and when the rotation knob is further rotated in a predetermined direction, the engagement projection of the shaft member is located at the locking position of the engagement hole of the rotation knob. Locking and fixing the rotary knob and the shaft member makes it extremely easy to attach and remove the rotary knob to and from the shaft member. High precision is not required for the dimensional accuracy of the rotary knob and the shaft member. The present invention relates to a rotary knob mechanism capable of reducing the number of rotation knobs.

[0002]

2. Description of the Related Art Electronic equipment, particularly audio equipment, is usually provided with a volume (volume control) knob. FIG. 10 is a view showing a rotary knob mechanism used for such a volume knob. The rotation knob mechanism 41 includes a rotation knob 42
And a variable resistor 43 connected to the rotation knob 42. The variable resistor 43 is mounted on a substrate 45, and has a D-cut shaft portion 43a at the tip.
The D-cut indicates a shape cut so that the shaft has a D-shaped cross section (see FIG. 12). The front panel 47 in front of the shaft 43a of the variable resistor 43 has a hole 47a through which the cylindrical portion 42a of the rotary knob 42 is inserted.
Are drilled.

FIG. 11 is a diagram showing a state in which a cylindrical portion 42a of a rotary knob 42 is extrapolated to a shaft portion 43a of a variable resistor 43, and FIG. 12 is a sectional view taken along line ZZ of FIG. 11 and 1
As shown in FIG. 2, the cylindrical portion 42a of the rotary knob 42 is externally inserted into the shaft portion 43a of the D-cut, and a pair of ribs 42b, 42b extend in the axial direction on the inner surface of the cylindrical portion 42a of the rotary knob 42. It is projected and protruded. Then, the D-cut shaft 43a of the variable resistor 43 is fitted to the inner surface of the cylindrical portion 42a of the rotary knob 42 and the ribs 42b, 42b, whereby the cylindrical portion 42a of the rotary knob 42 and the shaft of the variable resistor 43 are fitted. 43a
Are designed to rotate together.

[0004]

In the above-described rotary knob mechanism 41, the shaft 43a of the variable resistor 43 is provided.
The cylindrical portion 42a of the rotary knob 42 is externally fitted to and fitted to the rotary knob 42. For this reason, if the cylindrical portion 42a of the rotary knob 42 and the shaft portion 43a of the variable resistor 43 are too tightly fitted, it takes a considerable amount of force and labor to make the fitting, and the rotary knob 42 is pulled out for repair. However, it took a lot of power and effort and was troublesome. Further, when a large force is applied to the cylindrical portion 42a of the rotary knob 42 and press-fitted into the shaft portion 43a of the variable resistor 43, the soldering portion of the variable resistor 43 to the substrate 45 is lifted, causing an electrical failure. There was a fear.

On the other hand, if the cylindrical portion 42a of the rotary knob 42 and the shaft portion 43a of the variable resistor 43 are too loosely fitted, if hot stock (high-temperature storage test) is performed, the cylindrical portion of the rotary knob 42 will expand due to thermal expansion. 42a and shaft 43 of variable resistor 43
There is a possibility that the fitting of “a” is further loosened, and the rotary knob 42 falls out of the shaft portion 43 a of the variable resistor 43.

Therefore, it is preferable that the cylindrical portion 42a of the rotary knob 42 and the shaft portion 43a of the variable resistor 43 are fitted to each other with an appropriate hardness, and that the fitting is relatively easy. However, it is necessary to manufacture the rotary knob 42 and the shaft 43a of the variable resistor 43 such that the cylindrical portion 42a of the rotary knob 42 and the shaft 43a of the variable resistor 43 are fitted with such appropriate hardness. However, there has been a problem that a considerably high precision is required in manufacturing, and the manufacturing is difficult and the manufacturing cost is increased.

Accordingly, an object of the present invention is to provide a rotary knob mechanism which does not require high dimensional accuracy, can be easily and securely engaged and fixed, and can easily pull out and remove the rotary knob. It is assumed that.

[0008]

The rotary knob mechanism according to the present invention is a rotary knob mechanism comprising a rotatable rotary knob and a shaft member with which a cylindrical shaft of the rotary knob can be engaged and disengaged. An engagement hole having one end cut out at an end of a cylindrical shaft portion of the rotation knob, and an engagement protrusion for engaging with the engagement hole at an outer peripheral portion of the shaft member. A locking portion extending in the radial direction is provided, and a rotation preventing member for preventing rotation of the shaft member by contacting the locking portion of the shaft member is provided, and the rotation preventing member is located near the shaft member. When the rotation knob is rotated in a predetermined direction in a state where the engagement protrusion of the shaft member is engaged with the engagement hole of the rotation knob, the locking portion of the shaft member comes into contact with the rotation preventing member. When the rotation of the shaft member is stopped and the rotation knob is further rotated in a predetermined direction, the rotation knob is moved forward to the engagement position of the engagement hole of the rotation knob. The engaging projection of the shaft member is engaged, the shaft member and the rotary knob is characterized in that the fixed.

In the rotary knob mechanism according to the present invention, when the rotary knob is rotated in a predetermined direction in a state where the engaging projection of the shaft member is engaged with the engaging hole of the rotary knob, the locking portion of the shaft member is released. When the rotation member is brought into contact with the rotation preventing member, the rotation of the shaft member is prevented, and the rotation knob is further rotated in a predetermined direction, the engagement projection of the shaft member is locked at the locking position of the engagement hole of the rotation knob, and the rotation is stopped. The knob and the shaft member are fixed. For this reason, the mounting and fixing work of the rotary knob and the shaft member is extremely easy and reliable, and it is not necessary to make the dimensional accuracy of the rotary knob and the shaft member so high, so that the manufacturing is easy and the manufacturing cost is reduced. be able to.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary knob mechanism according to the present invention will be described below with reference to the drawings. FIG. 2 is a view showing an audio mini-component to which the rotation knob mechanism according to the present invention is applied. The audio mini-component 1 includes a center unit 2 and a pair of speaker units 3 provided on the left and right of the center unit 2.

At the top of the front panel 5, an MD (Mini
Disc) storage section 7 and display section 8 are provided. On the left side of the display section 8 of the front panel 5, a power button 10, a function switching button 11, a radio band switching button 12, and a recording button 13 for recording on an MD are provided.

On the right side of the display section 8 of the front panel 5, a CD eject button 15 for ejecting a CD (Compact Disc) mounted therein is projected. On the left side of the center of the vertical slot-shaped disc insertion slot 17 for inserting or removing a disc, an illumination 18 which serves as a mark for inserting a CD, indicates a recording surface side, and also has a decoration function is provided. Have been. A substantially semicircular notch 17a is provided on the right side of the center of the disc insertion slot 17. Below the display section 8 of the front panel 5, a CD
And various operation buttons 19 for operating the MD,
Below the various operation buttons 19, a volume dial (hereinafter, referred to as a rotation knob) 21 of the rotation knob mechanism according to the present invention is provided.

FIG. 1 is an exploded perspective view of a rotary knob mechanism according to the present invention. The rotation knob 21 of the rotation knob mechanism 20 is formed of a grip portion 21a and a cylindrical portion 21b that is a cylindrical shaft portion having a smaller diameter than the grip portion 21a and having one open side.
At the open side end of the cylindrical portion 21b of the rotary knob 21, an engagement hole 21c having one end cutout for engaging with an engagement protrusion 23b of a connecting member 23 described later is formed. The engagement hole 21c of the rotation knob 21 is provided in the guide portion 2 extending in the axial direction.
1c-1 and a lock portion 21c-2 extending in the circumferential direction at the back of the guide portion 21c-1.

One end of a connecting member 23 as a shaft member is inserted into the cylindrical portion 21b of the rotary knob 21, and the shaft portion 25a of the variable resistor 25 is inserted into and fitted into the other end of the connecting member 23. ing. The variable resistor 25 is mounted on the substrate 27. A hole 27a is formed above the mounting position of the variable resistor 25 on the substrate 27, and the tip end portion 28a of the rod member 28 as a rotation preventing member advances into the hole 27a. The rod member 28 has an elongated distal end portion 28a and a step portion 28b provided on the rear end side of the distal end portion 28a.
When inserted into the hole 27a, the step portion 28b comes into contact with the peripheral portion of the hole 27a to restrict the tip portion 28a from moving further. The connection member 23 will be described later in detail.

According to the present invention, when the rotating knob 21 is rotated in a predetermined direction in a state where the engaging projection 23b of the connecting member 23 is engaged with the engaging hole 21c of the rotating knob 21, the locking portion of the connecting member 23 When the rotation of the connecting member 23 is stopped in a predetermined direction, the connecting member 23 is engaged with the engaging position 21c-2 of the engaging hole 21c of the rotating knob. The collision portion 23b is locked, and the rotation knob 2
1 and the connecting member 23 are fixed, so that the rotation knob 2
It is extremely easy to attach and detach the first connection member 23, and high precision is not required for the dimensional accuracy of the rotary knob 21 and the connection member 23, thereby facilitating manufacture and reducing manufacturing costs.

Next, the connecting member 23 will be described. FIG. 3 shows the connecting member 23, (a) is a front view thereof, and (b)
Is a side view thereof, and (c) is a rear view thereof. Connecting member 2
Reference numeral 3 denotes a cylindrical portion 23a having both open ends, an engaging protrusion 23b for engaging with an engaging hole 21c of a rotary knob 21 protruding outward near one end of the cylindrical portion 23a, and a cylindrical portion. 2
3a is protruded outward in the vicinity of the other end of the engagement 3a.
and a locking portion 23c longer than b. As shown in FIG. 3B, the engagement protrusion 23b of the connecting member 23
It has a substantially triangular shape of a conical shape, and has an engagement hole 21 of a rotary knob 21.
Locking is possible by locking with the lock portion 21c-2 which is the locking position of c. The engagement protrusion 23b of the connecting member 23 and the lock 21c-2 of the rotary knob 21 will be described later in detail. The locking portion 23c of the connecting member 23 is for preventing the rotation of the connecting member 23 by being brought into contact with the rod member 28 during assembly and disassembly. Further, a pair of ribs 23d, 23d are provided in the cylindrical portion 23a of the connecting member 23 so as to extend inward and protrude.

FIG. 4 is a side view for explaining a state in which the connecting member 23 is fitted to the shaft portion 25a of the variable resistor 25. In this case, the back surface side of the surface of the substrate 27 on which the variable resistor 25 is mounted is supported by the support jig 30, and the connecting member 23
Of the variable resistor 2 using a mounting jig (not shown).
It is necessary to press-fit and fit into the D-cut portion 25a-1 of the shaft portion 25a of No. 5. If the connection member 23 is prevented from coming off the shaft portion 25a by another member, the connection member 2
It is sufficient that they are fitted to such an extent that the rotation of No. 3 is transmitted, and it is not always necessary to press-fit them. In FIG. 4, for the sake of simplicity, a part of the cylindrical portion 23a of the connecting member 23 is cut away and shown as a cross section.

As shown in FIG. 5, after connecting the connecting member 23 to the shaft portion 25a of the variable resistor 25,
When the cylindrical portion 21b of the rotary knob 21 is externally fitted to the cylindrical portion 23a of the connecting member 23 through the opening 5a of the connecting member 23,
Of the engagement knob 23b of the rotary knob 21 advances to the guide portion 21c-1 of the engagement hole 21c.

Next, as shown in FIG. 6, the tip portion 28a of the rod member 28 is inserted into the hole 27a of the substrate 27, and the grip portion 21a of the rotary knob 21 is gripped and rotated counterclockwise. As shown in FIG.
c abuts on the tip 28a of the rod member 28 to prevent rotation. When the rotary knob 21 is further rotated in the counterclockwise direction, only the cylindrical portion 21b rotates in the counterclockwise direction, and the engaging protrusion 23b of the connecting member 23 is at the locking position of the engaging hole 21c of the rotary knob 21. It relatively advances to the portion 21c-2, and is locked and locked.

FIG. 8 shows that when the rotation of the rotary knob 21 in the counterclockwise direction while the rotation of the connecting member 23 is stopped, the engaging projection 23b of the connecting member 23 is
This shows a state in which c-3 is forcibly passed and relatively advanced and locked to the lock portion 21c-2. Once the engaging protrusion 23b of the connecting member 23 advances and locks on the lock portion 21c-2, it easily moves in the direction of the arrow X because the engaging protrusion 23b has a substantially divergent triangular shape. Thus, the lock and the lock are not released.

FIG. 9 is a view for explaining a method of removing the rotary knob 21 for repair or the like. First, when the distal end portion 28a of the rod member 28 is inserted into the hole 27a of the substrate 27, and the grip portion 21a of the rotary knob 21 is gripped and rotated clockwise, the locking portion 23c of the connecting member 23 Rotation is stopped by contacting the tip portion 28a. When the rotary knob 21 is further rotated clockwise, only the cylindrical portion 21b rotates clockwise, and the engaging protrusion 23b of the connecting member 23 is relatively moved from the lock portion 21c-2 of the engaging hole 21c of the rotary knob 21. Then, it moves in the direction of arrow Y to advance to the guide portion 21c-1, and the lock and the lock are released. Engaging projection 2 of connecting member 23
In the state where 3b is locked and unlocked, the rotation knob 21 can be easily pulled out.

Accordingly, by rotating the rotation knob 21 counterclockwise in a state where the rod member 28 is in contact with the locking portion 23c of the connecting member 23 and the rotation of the connecting member 23 is prevented, the connecting member 23 is rotated. The engagement protrusion 23b is the rotation knob 21
Of the engaging hole 21c of the lock member 21c-2.
Since the rotary knob 21 and the connecting member 23 are fixed, the rotary knob 21 and the connecting member 23 can be easily and reliably fixed even if the degree of fitting between the rotary knob 21 and the connecting member 23 is loose. For this reason, the mounting and fixing work of the rotary knob 21 and the connecting member 23 is extremely easy, and the dimensional accuracy of the rotary knob 21 and the connecting member 23 does not need to be so high, and the manufacturing is easy and the manufacturing cost is reduced. Can be achieved.

Also, when the rotary knob 21 is detached for repair or the like, the rod member 28 is connected to the locking portion 2 of the connecting member 23.
By rotating the rotation knob 21 clockwise in a state where the rotation of the connecting member 23 is stopped by abutting on the connecting member 3c,
The engagement protrusion 23b of the connecting member 23 advances from the lock portion 21c-2 of the engagement hole 21c of the rotation knob 21 to the guide portion 21c-1 to release the lock and the lock. , And the operation of removing the rotary knob 21 is extremely easy.

In the above-described embodiment, the rotary knob mechanism 20 is applied to the audio mini-component. However, the present invention is not limited to this, and it is needless to say that the rotary knob mechanism 20 may be applied to other electronic devices having the rotary knob.

The rod member 28 is removed after the rotation knob 21 and the connecting member 23 are fixed. However, the present invention is not limited to this. The rod member 28 is fixed so that the rotation knob 21 can rotate only one rotation. May be configured. Further, the rod member 28 may be attached so as to be able to advance and retreat.

[0026]

As described above, according to the present invention,
When the rotation knob is rotated in a predetermined direction in a state where the engagement protrusion of the shaft member is engaged with the engagement hole of the rotation knob, the locking portion of the shaft member comes into contact with the rotation preventing member, and the rotation of the shaft member is stopped. Blocked,
When the rotation knob is further rotated in a predetermined direction, the engagement protrusion of the shaft member is locked at the locking position of the engagement hole of the rotation knob, and the rotation knob and the shaft member are fixed. For this reason, the mounting and fixing work of the rotary knob and the shaft member is extremely easy and reliable, and it is not necessary to make the dimensional accuracy of the rotary knob and the shaft member so high, so that the manufacturing is easy and the manufacturing cost is reduced. be able to.

When the rotation knob is removed for repair or the like, the rotation knob is rotated in a state in which the rotation preventing member is in contact with the locking portion of the shaft member to prevent the rotation of the shaft member. The engagement protrusion of the shaft member is disengaged from the engagement position of the engagement hole of the rotation knob, and the engagement and the lock are released, so that the rotation knob can be easily pulled out and removed, and the work of removing the rotation knob is extremely difficult. Easy.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a rotation knob mechanism according to the present invention.

FIG. 2 is a schematic front view of an audio mini component to which the rotation knob mechanism according to the present invention is applied.

FIG. 3 shows a connecting member, (a) is a front view thereof, (b)
Is a side view thereof, and (c) is a rear view thereof.

FIG. 4 is a side view showing a state where the connecting member is extrapolated to the shaft of the variable resistor.

FIG. 5 is a side view showing a state where the cylindrical portion of the rotary knob is externally fitted to the connecting member after the connecting member is externally inserted into the shaft of the variable resistor.

FIG. 6 is a side view showing a state in which the rotation knob is rotated counterclockwise.

FIG. 7 is a side view showing a state in which an engagement protrusion of the connection member is locked and locked by a lock portion of an engagement hole of the rotation knob.

FIG. 8 is a side view showing a state in which the engagement protrusion of the connecting member has advanced to the lock portion of the engagement hole of the rotary knob.

FIG. 9 is a side view illustrating the removal of the rotation knob.

FIG. 10 is an exploded view of an example of a conventional rotary knob mechanism.

FIG. 11 is an assembly view of an example of a conventional rotary knob mechanism.

FIG. 12 is a sectional view taken along line ZZ of FIG. 11;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Audio mini component 2 Center unit 3 Speaker unit 5 Front panel 20 Rotary knob mechanism 21 Rotary knob 21a Gripping part 21b Cylindrical part (cylindrical shaft part) 21c Engagement hole 21c-1 Guide part 21c-2 Lock part (locking position) 21c-3 Narrow portion 23 Connecting member (shaft member) 23a Cylindrical portion 23b Engaging projection 23c Locking portion 23d Rib 25 Variable resistor 25a Shaft portion 25a-1 D cut portion 27 Substrate 27a Hole 28 Rod member (rotation prevention) Member) 28a Tip 28b Step

Claims (3)

[Claims] 1. A rotary knob mechanism comprising: a rotatable rotary knob; and a shaft member with which a cylindrical shaft portion of the rotary knob can be engaged and disengaged. An engagement hole having one end cut out at an end portion is provided, and an engagement protrusion for engaging with the engagement hole and a locking portion extending in a radial direction are provided on an outer peripheral portion of the shaft member,
A rotation prevention member for abutting against a locking portion of the shaft member to prevent rotation of the shaft member, wherein the rotation prevention member is positioned near the shaft member, and the shaft is inserted into an engagement hole of the rotation knob. When the rotation knob is rotated in a predetermined direction in a state where the engagement protrusions of the members are engaged, the locking portion of the shaft member comes into contact with the rotation preventing member, and the rotation of the shaft member is prevented. When the is rotated in a predetermined direction, the engaging projection of the shaft member is locked at the locking position of the engaging hole of the rotary knob, and the rotary knob and the shaft member are fixed. Knob mechanism. 2. The rotation knob mechanism according to claim 1, wherein the rotation prevention member is removed after the rotation knob and the shaft member are fixed. 3. The apparatus according to claim 1, wherein the rotation preventing member is provided along an axial direction near the shaft member, and the rotation knob is rotatable within a required rotation angle within one rotation.
2. The rotation knob mechanism according to 1.