Knob type switch

Abstract

The invention belongs to the technical field of switches, and particularly relates to a knob type switch, which comprises a main shell provided with a first accommodating groove, and the first accommodating groove is enclosed by an annular retaining wall; the execution assembly comprises a columnar part and a rotating part; the columnar piece is arranged in the first accommodating groove; the columnar piece can do linear motion in the axis direction of the retaining wall and can do rotating motion with the axis direction of the retaining wall as a rotating shaft. The rotating piece can be linked along with the movement of the columnar piece; and the guiding piece is arranged between the columnar piece and the retaining wall so as to form guiding of linear motion and guiding of rotary motion of the columnar piece relative to the retaining wall. According to the knob type switch, the guide piece is used for guiding movement, so that the problems of shaking of the pressing panel, clamping stagnation of pressing, inclination during pressing, non-simultaneous downward pressing and the like caused by the adoption of a rib groove structure are solved, and the stability and convenience of operation of the knob type switch are greatly improved.

Description

Technical Field

[0001] The invention belongs to the technical field of switches, and in particular relates to a knob type switch. Background Art

[0002] At present, the conventional button pressing structure is a rib groove designed to be vertically matched with the pressing direction to serve as a guide for pressing, so that the button can move up and down to achieve pressing.

[0003] However, when the area of ​​the button is relatively large, the gap and tolerance between the button and the side wall of the hole where the button is installed often cause the pressing panel to shake, get stuck, tilt when pressed, or not press downwards at the same time.

[0004] Specifically, the above gaps can easily cause the keys to shake during the pressing process, which not only affects the user's operating feel, but may also accelerate structural wear and shorten the service life. In addition, due to the existence of gaps and tolerances, the keys may not move smoothly and require additional force to complete the pressing, which not only reduces operating efficiency but may also cause user fatigue.

[0005] Therefore, it is necessary to propose further solutions to the above problems. Summary of the invention

[0006] The present invention aims to provide a knob switch to overcome the deficiencies in the prior art.

[0007] In order to solve the above technical problems, the technical solution of the present invention is:

[0008] A knob switch, comprising:

[0009] A main shell, wherein the main shell is provided with a first accommodating groove, and the first accommodating groove is surrounded by a circular retaining wall;

[0010] An execution assembly, the execution assembly comprising: a columnar member and a rotating member;

[0011] The columnar member is disposed in the first accommodating groove; the columnar member can perform linear motion along the axis direction of the retaining wall, and can perform rotational motion with the axis direction of the retaining wall as the rotation axis; the rotating member can be linked with the movement of the columnar member;

[0012] The guide member is arranged between the columnar member and the retaining wall to form a guide for the linear motion and the rotational motion of the columnar member relative to the retaining wall.

[0013] Preferably, the knob switch further comprises: a first sensor and a PCB board;

[0014] The first sensor is disposed on the PCB board. When the columnar member moves linearly, the first sensor can be triggered by interacting with the columnar member and transmit a first sensing signal to the PCB board.

[0015] Preferably, the knob switch further comprises: a second sensor and a PCB board;

[0016] The second sensor is disposed on the PCB board. When the columnar member rotates, the second sensor can be triggered by interacting with the rotating member and transmit a second sensing signal to the PCB board.

[0017] Preferably, the knob switch further includes a damping member; the damping member applies a rotational resistance to the rotating member.

[0018] Preferably, the main housing is further provided with a second accommodating groove arranged around the outside of the first accommodating groove, and the rotating member is arranged in the second accommodating groove;

[0019] The damping member includes a plurality of magnets; some of the magnets are circumferentially spaced on the retaining wall, and the remaining magnets are circumferentially spaced on the rotating member and are located at the periphery of the some of the magnets; and the magnetic poles of the some of the magnets and the remaining magnets are arranged oppositely in a one-to-one manner.

[0020] Preferably, a spring sheet arranged to be inclined downward is further provided in the first receiving groove, and a groove is provided on the outer side wall of the columnar member; one end of the spring sheet extends into the groove and initially abuts against the lower edge of the groove.

[0021] Preferably, the guide member comprises: a ball and a cylinder with openings at both ends;

[0022] The side wall of the cylinder is provided with a plurality of through holes, and a ball is installed in each of the through holes. The ball can rotate with a straight line perpendicular to the axial direction of the cylinder as the rotation axis, and can also rotate with a straight line parallel to the axial direction of the cylinder as the rotation axis;

[0023] The projection of the ball on the end surface of the cylinder is located outside the outer circumferential surface of the cylinder, and the projection of the ball on the end surface of the cylinder is located inside the inner circumferential surface of the cylinder.

[0024] Preferably, the ball is loosely matched with the through hole, and anti-slip structures are provided at both inner and outer ends of the through hole;

[0025] The anti-slip structure comprises a protrusion, and protrusions are provided at both ends of the through hole, and the distance from the protrusion to the central axis of the through hole is smaller than the radius of the ball.

[0026] Preferably, when there are three rows of through holes, at least two rows of corresponding through holes are aligned in the axial direction of the cylinder.

[0027] Preferably, at least three rows of through holes are provided on the cylinder, and the through holes in two adjacent rows are staggered in the axial direction of the cylinder.

[0028] Preferably, the number of projections of the through holes on the end surface of the cylinder is at least 3.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. The knob switch of the present invention adopts a guide member to guide the movement, thereby avoiding the problems of shaking of the pressing panel, stuck pressing, tilting when pressing, and not pressing downward at the same time when using a rib-groove structure, thereby greatly improving the stability and convenience of the knob switch operation.

[0031] 2. The guide side wall of the rotary switch of the present invention is provided with a plurality of balls. When the actuator is rotated and / or pressed, the plurality of balls assist the actuator in rotating and / or moving up and down by rolling. In this way, not only the operability of the actuator in rotating and / or moving up and down is ensured, but also because the guide has the guiding function of both rotating and moving up and down, it is not necessary to separately provide two sets of guides, which greatly simplifies the structure of the rotary switch.

[0032] 3. The through hole on the cylinder of the knob switch of the present invention is also provided with an anti-drop structure. By providing the anti-drop structure, the ball will not fall off from the through hole, but can always assist in rolling stably, thereby greatly improving the stability of the guide member during operation.

[0033] 4. In the knob switch of the present invention, the arrangement of the through holes is also optimized, which is conducive to maintaining uniform force when the guide member is working, further ensuring that the guide member can work stably, and also enables the mechanical strength of the guide member itself to meet actual needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a three-dimensional schematic diagram of a knob switch in one embodiment of the present invention;

[0035] Figure 2 for Figure 1 3D exploded diagram of the middle knob switch;

[0036] Figure 3 for Figure 1 Longitudinal section of the middle rotary switch;

[0037] Figure 4 for Figure 3 Enlarged view of area A in the middle;

[0038] Figure 5 for Figure 1 A three-dimensional schematic diagram of a middle guide member;

[0039] Figure 6 for Figure 5 Enlarged view of middle area B;

[0040] Figure 7 for Figure 1 A schematic diagram of the internal structure in which part of the main shell is removed;

[0041] Figure 8 for Figure 1 Horizontal cross-section of the rotary switch. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] like Figure 1 , 2 As shown in FIG. 3 , an embodiment of the present invention provides a knob switch. The knob switch of this embodiment includes: a main housing 10 , an actuator 20 , a guide member 30 , a first sensor 40 , a second sensor 50 , a PCB board 60 , a damping member 70 and an anti-slip structure 80 .

[0044] The main housing 10 forms the main structure of the knob switch, and includes a first receiving groove 11, a second receiving groove 12 and a third receiving groove 13. The first receiving groove 11 and the second receiving groove 12 are used to receive and install the actuator 20, and the third receiving groove 13 is used to receive and install the PCB board 60.

[0045] Specifically, the second accommodating groove 12 is located outside the first accommodating groove 11 and is coaxially arranged around the first accommodating groove 11. The first accommodating groove 11 and the second accommodating groove 12 are separated by a circular retaining wall 14, that is, the inner side of the retaining wall 14 forms the first accommodating groove 11, and the outer side thereof forms the second accommodating groove 12. The third accommodating groove 13 is located below the first accommodating groove 11 and is connected to the first accommodating groove 11, so that the actuator 20 can interact with the PCB board 60.

[0046] The actuator 20 is used to transmit the pressing and rotating operation of the knob switch. The actuator 20 includes a columnar member 21 and a rotating member 22. The columnar member 21 is used to transmit the pressing operation of the knob switch. The columnar member 21 is received and installed in the first receiving groove 11, and can move linearly along the axial direction of the retaining wall 14 under the action of pressing. At the same time, when the columnar member 21 is subjected to a rotating force, it can also rotate with the axial direction of the retaining wall 14 as the rotating axis.

[0047] like Figure 4 As shown, in order to axially limit the columnar member 21 and enable the columnar member 21 to return to its initial position when not subjected to external force. A spring piece 111 arranged to be tilted downward is also provided in the first receiving groove 11. Accordingly, a groove 211 is provided on the outer wall of the columnar member 21, and one end of the spring piece 111 can extend into the groove 211 and initially abut against the lower edge of the groove 211. In one embodiment, the spring piece 111 is provided in a plurality of groups, and each spring piece 111 is circumferentially spaced and arranged at the lower end of the inner side of the first receiving groove 11.

[0048] Thus, when the columnar member 21 is pressed down along the axial direction of the first accommodating groove 11 under the action of external force, the spring sheet 111 separates from the lower edge. As the columnar member 21 is pressed down, the spring sheet 111 finally abuts against the upper edge of the groove 211 to achieve axial limiting.

[0049] The rotating member 22 is used to transmit the rotation operation of the knob switch, and the rotating member 22 is received and installed in the second receiving groove 12. The columnar member 21 and the rotating member 22 can form a linkage, that is, the rotating member 22 can move synchronously with the movement of the columnar member 21. In this way, when the columnar member 21 rotates with the axial direction of the retaining wall 14 as the rotation axis, it can drive the rotating member 22 to rotate synchronously.

[0050] In order to realize the linkage between the two, the upper end of the columnar member 21 can be connected to the rotating member 22 as a whole through a cap 90. At this time, the cap 90 is buckled on the upper end of the first receiving groove 11, one end of the columnar member 21 is connected to the middle area of ​​the cap 90, and one end of the rotating member 22 is connected to the surrounding edges of the cap 90. Alternatively, the columnar member 21 can also be directly connected to the rotating member 22. At this time, one end of the rotating member 22 can extend into the first receiving groove 11 to be connected to the columnar member 21 as a whole.

[0051] like Figure 5 As shown, the guide member 30 is used to provide guidance for the movement of the above-mentioned actuator 20, thereby avoiding the problems of shaking of the pressing panel, sticking when pressing, tilting when pressing, and not pressing downward at the same time when using the rib-groove structure, thereby greatly improving the stability and convenience of the knob switch operation.

[0052] Specifically, the guide member 30 is disposed between the columnar member 21 and the retaining wall 14 to guide the linear motion and rotational motion of the columnar member 21 relative to the retaining wall 14. The guide member 30 includes a ball 31 and a cylinder 32 with openings at both ends.

[0053] The side wall of the cylinder 32 is provided with a plurality of through holes 321, and the aforementioned through holes 321 are used to assist the installation and fixation of the balls 31. Accordingly, a ball 31 is installed in each through hole 321, and the ball 31 can rotate with a straight line perpendicular to the axial direction of the cylinder 32 as the rotation axis L1. In this way, when the columnar member 21 is pressed, the plurality of balls 31 rotate around the aforementioned rotation axis L1, thereby assisting the columnar member 21 to move up and down through their own rolling, thereby overcoming the defect of providing rib grooves for guidance.

[0054] In order to ensure that the ball 31 can keep in contact with the surfaces of the components on both sides, the projection of the part of the ball 31 on the end surface of the cylinder 32 is located outside the outer circumferential surface of the cylinder 32, and the projection of the part of the ball 31 on the end surface of the cylinder 32 is located inside the inner circumferential surface of the cylinder 32. That is, both sides of the ball 31 extend from the through hole 321. Therefore, when the ball 31 assists the columnar member 21 to move up and down, the part of the ball 31 located inside the cylinder 32 contacts the surface of the inner part of the columnar member 21, and the part of the ball 31 located outside the cylinder 32 contacts the surface of the outer part of the columnar member 21. In this way, rolling contact is formed between the two components, thereby overcoming the defect of providing rib grooves for guidance when pressing the columnar member 21.

[0055] Furthermore, the ball 31 can rotate with a straight line perpendicular to the axial direction of the cylinder 32 as the rotation axis L1, and the ball 31 can also rotate with a straight line L2 parallel to the axial direction of the cylinder 32 as the rotation axis. That is, the guide member 30 can also assist the columnar member 21 in rotating. In this way, the guide member 30 of this embodiment combines two functions, thereby not only ensuring the ease of operation of the columnar member 21 rotating and / or moving up and down, but also greatly simplifying the structure of the knob switch because it is not necessary to set two sets of guide structures. Accordingly, the diameter of the ball is greater than the wall thickness of the cylinder 32, so that both sides of the ball can extend from the through hole 321.

[0056] Regardless of whether the ball 31 rotates with the straight line perpendicular to the axis of the cylinder 32 as the rotation axis L1 or with the straight line L2 parallel to the axis of the cylinder 32 as the rotation axis, the ball 31 is required to always keep rolling in the through hole 321. To achieve the above purpose, the ball 31 is clearance-matched with the through hole 321, and anti-slip structures 80 are provided at both inner and outer ends of the through hole 321.

[0057] like Figure 6As shown, the anti-slip structure 80 includes a protrusion 81. The protrusion 81 is provided at both ends of the through hole 321, and the distance from the protrusion 81 to the central axis of the through hole 321 is less than the radius of the ball 31. In this way, the protrusion 81 can always restrict the ball 31 in the through hole 321 so that it will not fall out of the through hole 321 during the rolling process, and at the same time will not affect the two sides of the ball 31 from extending out of the through hole 321, which greatly improves the stability of the guide member 30 during operation. In one embodiment, the protrusions 81 at either end of the through hole 321 are symmetrically distributed at the edge position of the end.

[0058] As described above, each through hole 321 is used to assist the installation and fixation of the ball bearing 31. However, the arrangement of the through holes 321 will affect the force of the guide member 30, that is, when the through holes 321 are arranged unevenly, the guide member 30 will be tilted. At the same time, the through holes 321 will also affect the mechanical strength of the guide member 30. Therefore, the arrangement of the through holes 321 is also optimized in this embodiment.

[0059] Specifically, at least three rows of through holes 321 are provided on the cylinder 32, and the row of through holes 321 referred to herein refers to the circumferential direction of the guide member 30. At this time, each row of through holes 321 can be aligned in the axial direction of the guide member 30, or can be arranged without being aligned. When each row of through holes 321 is aligned, the spacing between two adjacent rows should be increased, because if the spacing is too small, the overall structural strength of the guide member 30 will be insufficient; when each row of through holes 321 is not aligned, the spacing between two adjacent rows can be reduced to ensure structural strength and improve space utilization.

[0060] Based on the above considerations, in one embodiment, at least two rows of through holes 321 are aligned in the axial direction of the cylinder 32 to ensure uniform force, and the remaining rows of through holes 321 can be aligned or staggered. In another embodiment, two adjacent rows of through holes 321 are staggered in the axial direction of the cylinder 32, that is, each row of through holes 321 is aligned at intervals to ensure uniform force.

[0061] For example, when three rows of through holes 321 are provided, six through holes 321 are provided in the first row starting from the upper end of the cylinder 32, five through holes 321 are provided in the second row, and six through holes 321 are provided in the third row. At this time, the projection of the through holes 321 in the first row on the end surface of the cylinder 32 and the projection of the through holes 321 in the third row on the end surface of the cylinder 32 completely overlap, that is, the through holes 321 in the first row are aligned with the through holes 321 in the third row. And between the projections of any two adjacent through holes 321 in the first row on the end surface of the cylinder 32, there is a projection of a through hole 321 in the second row on the end surface of the cylinder 32.

[0062] In addition, this embodiment also imposes the following requirements on the number of through holes 321: the projection of the through holes 321 on the end surface of the cylinder 32 is at least 3. This is because too few balls 31 may be detrimental to the guidance of the columnar member 21 during movement, and a row of at least three balls 31 is also conducive to supporting the cylinder 32 in multiple directions.

[0063] Therefore, with the assistance of the guide member 30 , not only the stability and convenience of the knob switch operation are greatly improved, but also the actuator 20 is facilitated to interact with the sensor on the PCB board 60 .

[0064] The PCB board 60 forms the circuit part of the knob switch. The PCB board 60 is received and installed in the third receiving groove 13, and the first sensor 40 and the second sensor 50 are arranged on the PCB board 60. When the first sensor 40 and the second sensor 50 interact with the actuator 20, they can send a sensing signal to the circuit part on the PCB board 60, so that the PCB board 60 executes the corresponding control instruction.

[0065] Specifically, a spring or a conductive rubber pad is connected to the lower end of the columnar member 21, and the spring or the rubber pad is located above the contact on the PCB board 60. Therefore, when the columnar member 21 is pressed, it can contact the first sensor 40 on the PCB board 60 through the spring or the conductive rubber pad at the lower end, thereby making the first sensor 40 conductive with the electronic components or circuits on the PCB board 60. In one embodiment, the first sensor 40 is an elastic contact, so that the elastic contact can rebound to the initial shape when it is separated from the lower end of the columnar member 21.

[0066] like Figure 7 As shown, the second sensor 50 is arranged on the PCB board 60, which extends into the second accommodating groove 12 through an opening and is located on the motion track of the rotating member 22. Therefore, the lower end of the rotating member 22 can interact with the sensor as it rotates to realize the control circuit switch or gear adjustment.

[0067] In one embodiment, a plurality of light shielding plates 221 are provided at intervals in the circumferential direction at the lower end of the rotating member 22. Accordingly, the second sensor 50 is a photoelectric sensor. The photoelectric sensor has a transmitting end 51 and a receiving end 52 which are arranged opposite to each other, and the transmitting end 51 can send a signal to the receiving end 52. When the rotating member 22 is rotated, each light shielding plate 221 at the lower end thereof can move in sequence between the transmitting end 51 and the receiving end 52, thereby blocking the transmission of the signal between the two. Thus, the control circuit switch or gear adjustment is realized by the on-off of the signal between the transmitting end 51 and the receiving end 52.

[0068] When rotating the rotating member 22, a certain damping force needs to be provided therefor. This can provide a better operating feel on the one hand, and can also prevent the rotating member 22 from rotating freely, thereby destroying the adjustment gear or affecting the operating accuracy on the other hand.

[0069] like Figure 8 As shown, based on the above considerations, this embodiment provides rotational resistance for the rotating member 22 during rotation by setting a damping member 70. The damping member 70 includes a plurality of magnets. Among them, some magnets 71 are arranged on the outer wall of the retaining wall 14 at intervals in the circumferential direction. In one embodiment, the part of the magnets 71 can be arranged in the above-mentioned side wall in an interlocking manner. The remaining magnets 72 are arranged on the rotating member 22 at intervals in the circumferential direction and are located at the periphery of the above-mentioned part of the magnets 71. In one embodiment, the remaining magnets 72 can be arranged in the inner wall of the rotating member 22 in an interlocking manner. And the magnetic poles of the above-mentioned part of the magnets 71 and the remaining magnets 72 are kept in an oppositely polarized relative arrangement. Thus, when the rotating member 22 is rotated, due to the adsorption effect between the magnets 71 and 72, rotational resistance can be provided for the rotation of the rotating member 22.

[0070] In summary, the knob switch of the present invention adopts a guide member to guide the movement, thereby avoiding the problems of shaking of the pressing panel, sticking when pressing, tilting when pressing, and not pressing downward at the same time when pressing when using a rib-groove structure, thereby greatly improving the stability and convenience of the knob switch operation.

[0071] The guide side wall of the rotary switch of the present invention is provided with a plurality of balls. When the actuator is rotated and / or pressed, the plurality of balls assist the actuator in rotating and / or moving up and down by rolling. In this way, not only the operability of the actuator in rotating and / or moving up and down is ensured, but also because the guide has the guiding function of both rotating and moving up and down, it is not necessary to separately provide two sets of guides, which greatly simplifies the structure of the rotary switch.

[0072] The through hole on the cylinder of the knob switch of the present invention is also provided with an anti-dropping structure, by which the ball will not drop out of the through hole, but can always assist in rolling stably, thereby greatly improving the stability of the guide member during operation.

[0073] In the knob switch of the present invention, the arrangement of the through holes is also optimized, which is beneficial for maintaining uniform force when the guide member is working, further ensuring that the guide member can work stably, and also enables the mechanical strength of the guide member itself to meet actual needs.

[0074] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0075] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A knob switch, characterized in that: include: A main housing (10), wherein the main housing (10) is provided with a first accommodating groove (11), and the first accommodating groove (11) is surrounded by a circular retaining wall (14); An actuator component (20), the actuator component (20) comprising: a columnar member (21) and a rotating member (22); The columnar member (21) is arranged in the first containing groove (11); the columnar member (21) can perform linear motion along the axial direction of the retaining wall (14), and can perform rotational motion with the axial direction of the retaining wall (14) as the rotation axis; the rotating member (22) can be linked with the movement of the columnar member (21); A guide member (30) is arranged between the columnar member (21) and the retaining wall (14) to guide the linear motion and rotational motion of the columnar member (21) relative to the retaining wall (14).

2. The knob switch according to claim 1, characterized in that: The knob switch further comprises: a first sensor (40) and a PCB board (60); The first sensor (40) is arranged on the PCB board (60), and when the columnar member (21) moves linearly, the first sensor (40) can be triggered by interacting with the columnar member (21) and transmit a first sensing signal to the PCB board (60).

3. The knob switch according to claim 1, characterized in that: The knob switch further comprises: a second sensor (50) and a PCB board (60); The second sensor (50) is arranged on the PCB board (60), and when the columnar member (21) rotates, the second sensor (50) can be triggered by interacting with the rotating member (22) and transmit a second sensing signal to the PCB board (60).

4. The knob switch according to claim 3, characterized in that: The knob switch also includes a damping member (70); the damping member (70) applies a rotational resistance to the rotating member (22).

5. The knob switch according to claim 4, characterized in that: The main housing (10) is further provided with a second accommodating groove (12) arranged around the outside of the first accommodating groove (11), and the rotating member (22) is arranged in the second accommodating groove (12); The damping member (70) comprises a plurality of magnets; some of the magnets (71) are arranged on the retaining wall (14) at intervals in the circumferential direction, and the remaining magnets (72) are arranged on the rotating member (22) at intervals in the circumferential direction and are located outside the some of the magnets (71); and the magnetic poles of the some of the magnets (71) and the remaining magnets (72) are arranged oppositely in a one-to-one manner.

6. The knob switch according to claim 1, characterized in that: A spring sheet (111) arranged to be inclined downward is also provided in the first receiving groove (11), and a groove (211) is provided on the outer side wall of the columnar member (21); one end of the spring sheet (111) extends into the groove (211) and initially abuts against the lower edge of the groove (211).

7. The knob switch according to any one of claims 1 to 6, characterized in that: The guide member (30) comprises: a ball (31) and a cylinder (32) with openings at both ends; The side wall of the cylinder (32) is provided with a plurality of through holes (321), and a ball (31) is installed in each of the through holes (321). The ball (31) can rotate with a straight line perpendicular to the axial direction of the cylinder (32) as the rotation axis, and can also rotate with a straight line parallel to the axial direction of the cylinder (2) as the rotation axis; The projection of the portion of the ball (31) on the end surface of the cylinder (32) is located outside the outer circumferential surface of the cylinder (32), and the projection of the portion of the ball (31) on the end surface of the cylinder (32) is located inside the inner circumferential surface of the cylinder (32).

8. The knob switch according to claim 7, characterized in that: The ball (31) is clearance-matched with the through hole (321), and anti-slip structures (80) are provided at both inner and outer ends of the through hole (321); The anti-slip structure (80) comprises a protrusion (81), and protrusions (81) are provided at both ends of the through hole (321), and the distance from the protrusion (81) to the central axis of the through hole (321) is smaller than the radius of the ball (31).

9. The knob switch according to claim 7, characterized in that: When the through holes (321) are arranged in three rows, at least two rows of corresponding through holes (321) are aligned in the axial direction of the cylinder (32).

10. The knob switch according to claim 7, characterized in that: At least three rows of through holes (321) are provided on the cylinder (32), and the through holes (321) in two adjacent rows are staggered in the axial direction of the cylinder (32).

11. The rotary switch according to claim 9 or 10, characterized in that: The number of projections of the through holes (321) on the end surface of the cylinder (32) is at least three.

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