Multifunctional shaver capable of automatically recognizing type of tool bit through pressing

Abstract

The utility model provides a multifunctional shaver capable of automatically recognizing the type of a tool bit through pressing. The multifunctional shaver comprises a main machine handle, a driving motor, the tool bit, a power source, a power switch, a microswitch, a pressing rib and a circuit board structure. Wherein the microswitch is arranged on the positioning installation part, and the pressing rib is arranged on the tool bit. When the tool bit is used, tool bits with different functions are selected to be installed on the positioning installation part according to requirements of a user, the pressing rib presses the microswitch to recognize the type of the installed tool bit, then a circuit with the voltage matched with the recognized type of the tool bit on the circuit board structure is switched on, and the power switch controls a power source to switch on the tool bit through the switched-on circuit. And voltage matched with the type of the tool bit is provided for the driving motor to drive the tool bit to work. According to the multifunctional shaver, the type of the shaver head can be simply and rapidly recognized only by pressing the micro switch through the pressing rib, and a circuit with adaptive voltage is distributed to the driving motor through the circuit board structure so as to drive the shaver head to work normally.

Description

Technical Field

[0001] The utility model relates to the technical field of shavers, in particular to a multifunctional shaver which can automatically identify the type of a cutter head by pressing. Background Art

[0002] A shaver is generally used to shave hair on the human body. A razor is a type of shaver, generally used to trim beards; shavers also include nose hair shavers, body hair shavers, etc. Existing common shavers generally include one blade head, which can only be used in one scenario. Later, in order to expand the application scenarios, multi-blade head shavers appeared. It generally includes a main body handle and a blade head detachably mounted on the head of the main body handle. This shaver has multiple detachable blade heads and can be flexibly used in various scenarios, which is popular with everyone.

[0003] When the cutter head installed on the head of the main handle needs to be electrically driven, the driving voltage required by different cutter heads is often different, so how to more conveniently and accurately provide the appropriate voltage for different cutter heads becomes a problem that needs to be solved. Chinese patent document CN209158468U discloses a personal care device for performing personal care operations on an object, the personal care device includes a handheld base body, a drive unit, a sensor and a control unit; the drive unit is used to receive and drive an interchangeable treatment head to perform personal care operations, wherein the drive unit includes a drive shaft and a motor device, the drive shaft is used to receive the interchangeable treatment head, and the motor device is used to rotate the drive shaft and / or apply vibration motion to the drive shaft; the sensor is used to measure the amount of current obtained from the motor device while the drive unit is operated; the control unit is operably connected to the sensor and the drive unit and is configured to control the drive unit, wherein the sensor is configured to measure the motor current at a predetermined measurement time after the drive unit is activated, and the control unit is configured to identify a separate treatment head installed on the drive unit by comparing the motor current measured at the predetermined measurement time with at least one predetermined current threshold.

[0004] The technical solution in the above patent document identifies the processing head by detecting the current value of the processing head installed on the handheld base body, and provides a corresponding voltage to the motor to drive the processing head to work. However, the above technical solution is relatively complicated. Once the measurement of the current value is affected, the identification effect of the processing head will be affected.

[0005] Therefore, how to design a simple and direct solution that can quickly identify the type of cutter head and provide the motor with a suitable voltage to drive the cutter head to work normally is a technical problem that has not yet been solved in the prior art. Utility Model Content

[0006] Therefore, the technical problem to be solved by the utility model is to overcome the technical defects in the prior art that the solution for identifying the type of cutter head is complex and the identification of the cutter head will be affected once the measurement of the current value is affected, thereby providing a shaver that can simply and quickly identify the type of cutter head without detecting the current value, and can provide the motor with a suitable current to drive the cutter head to work normally.

[0007] To this end, the utility model provides a multifunctional shaver that can automatically identify the type of a cutter head by pressing, comprising:

[0008] The main machine handle has a positioning and mounting portion at the top;

[0009] A driving motor is installed inside the main machine handle and has a driving shaft extending outward from the middle of the positioning mounting portion;

[0010] A cutter head is detachably mounted on the positioning and mounting portion, and can be driven by the driving shaft after being assembled with the driving shaft;

[0011] A power supply, used to supply power to the drive motor;

[0012] A power switch connected in series to a circuit in which the power source supplies power to the drive motor;

[0013] At least one micro switch is arranged on the positioning mounting portion;

[0014] A pressing rib is arranged on the cutter head, and the pressing rib is arranged at different positions on different types of cutter heads;

[0015] A circuit board structure having circuits for supplying different voltages to the drive motor;

[0016] After different types of cutter heads are installed on the positioning and mounting part, the pressing ribs arranged on the cutter head press the micro switch at the corresponding position, and the micro switch connects the voltage circuit on the circuit board structure that is compatible with the cutter head type. When the power switch is turned on, the cutter head is provided with a corresponding voltage.

[0017] As a preferred solution, the cutter head is detachably mounted on the positioning mounting portion via a mounting cover.

[0018] As a preferred solution, the pressing ribs are arranged on the inner wall of the mounting cover.

[0019] As a preferred solution, the micro switch is arranged at the end of the positioning mounting portion.

[0020] As a preferred solution, a mounting groove is formed at the end of the positioning mounting portion, and the micro switch is mounted inside the mounting groove.

[0021] As a preferred solution, it further includes a positioning and mounting structure, which is arranged between the positioning and mounting portion and the mounting cover;

[0022] The positioning and mounting structure comprises:

[0023] A first positioning groove and / or a first positioning convex strip formed on the outer wall of the positioning and mounting portion;

[0024] A second positioning convex strip and / or a second positioning groove are formed on the inner wall of the mounting cover;

[0025] The first positioning groove can be matched and inserted with the second positioning convex strip, and the first positioning convex strip can be matched and inserted with the second positioning groove.

[0026] As a preferred embodiment, at least two pressing ribs are arranged on the cutter head. When the cutter head is installed on the positioning mounting portion, at least two pressing ribs simultaneously press at least two micro switches to connect the circuit on the circuit board structure for supplying corresponding voltage to the cutter head of the corresponding type.

[0027] As a preferred embodiment, the cutter head includes at least one of the three types of cutter heads: a razor head, a U-shaped cutter head and a nose hair cutter head; the razor head is suitable for trimming facial beard, the U-shaped cutter head is suitable for trimming hair, and the nose hair cutter head is suitable for trimming nose hair.

[0028] As a preferred solution, a head magnet is provided at the end of the positioning mounting portion, and a tool head magnet is provided at the corresponding position of the tool head. When the tool head is installed on the positioning mounting portion, the head magnet and the tool head magnet attract each other, so that the pressing ribs can press on the micro switch with greater force.

[0029] As a preferred solution, the head magnet is annular and is fixedly sleeved around the driving shaft.

[0030] The technical solution provided by the utility model has the following advantages:

[0031] 1. The utility model provides a multifunctional shaver that automatically identifies the type of a cutter head by pressing, comprising a main body handle, a driving motor, a cutter head, a power source, a power switch, a micro switch, pressing ribs and a circuit board structure; wherein the top of the main body handle has a positioning mounting portion, the driving motor has a driving shaft, the cutter head is mounted on the positioning mounting portion and can be driven by the driving shaft, the power switch supplies power to the driving motor by controlling the on and off of the power source, the micro switch is arranged on the positioning mounting portion, the pressing ribs are arranged on the cutter head, and the circuit board structure has a circuit for supplying different voltages to the driving motor.

[0032] During use, according to user needs, select cutter heads with different functions and install them on the positioning and mounting part of the main handle. The pressing ribs on the cutter head are pressed against the micro switch correspondingly arranged on the positioning and mounting part to identify the type of the installed cutter head. Then, the circuit on the circuit board structure with a voltage matching the identified cutter head type is directly connected or connected through chip control. When the power switch is turned on, the power supply provides the drive motor with a voltage matching the cutter head type through the circuit board structure. The drive motor drives the drive shaft to rotate, thereby driving the cutter head to work.

[0033] The utility model discloses a multifunctional shaver which can automatically identify the type of the cutter head by pressing. The cutter head type can be simply and quickly identified by pressing the tendon to press the micro switch, without detecting the current value. A circuit with a matching voltage is allocated to the driving motor through the circuit board structure, so as to drive the cutter head to work normally.

[0034] 2. The utility model is a multifunctional shaver that automatically identifies the type of the cutter head by pressing, wherein the first positioning groove and the first positioning convex strip are formed on the outer wall of the positioning mounting portion, and the second positioning convex strip and the second positioning groove are formed on the inner wall of the mounting cover. When the cutter head is mounted on the positioning mounting portion through the mounting cover, the positioning convex strip and the positioning groove are matched and plugged to realize the positioning of the cutter head, so that the pressing muscle can be accurately pressed on the micro switch to avoid misalignment of the pressing.

[0035] 3. The utility model is a multifunctional shaver that automatically identifies the type of blade head by pressing. At least two pressing ribs can be set on certain blade heads. When the blade head of this type is installed, at least two pressing ribs can press multiple micro switches at the same time. When multiple micro switches are pressed at the same time, it means that a certain type of blade head is currently installed. By pressing multiple micro switches, a specific circuit on the circuit board structure can be connected. When the power supply supplies power to the blade head through the circuit, a voltage that matches the blade head type can be output to drive the blade head to work normally. The utility model is a multifunctional shaver that can use multiple pressing ribs to press multiple micro switches at the same time to determine the blade head type and automatically connect a circuit that can adapt the voltage to the blade head of this type.

[0036] 4. The utility model is a multifunctional shaver which can automatically identify the type of blade head by pressing. The blade heads include a razor head, a U-shaped blade head and a nose hair blade head. The razor head is suitable for trimming facial beard, the U-shaped blade head is suitable for trimming hair, and the nose hair blade head is suitable for trimming nose hair. Users can install different blade heads according to their needs to perform different tasks.

[0037] 5. The utility model provides a multifunctional shaver that automatically identifies the type of the cutter head by pressing. A head magnet is provided on the positioning mounting portion, and a cutter head magnet is provided at a corresponding position of the cutter head. When the cutter head is mounted on the positioning mounting portion, the head magnet and the cutter head magnet attract each other. The mutual attraction of the magnets makes the installation between the positioning mounting portion and the cutter head more secure, and also enables the pressing muscle to press on the micro switch with greater force, thereby avoiding the situation where the micro switch is not pressed into place due to insufficient pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the technical solutions in the prior art or the specific implementation methods of the present utility model, the drawings used in the description of the prior art or the specific implementation methods are briefly introduced below.

[0039] Figure 1 The utility model is a schematic diagram of the overall structure of a multifunctional shaver which can automatically identify the type of the cutter head by pressing.

[0040] Figure 2 It is a schematic diagram of the overall structure of the main engine handle with a U-shaped cutter head installed.

[0041] Figure 3 It is a schematic diagram of the overall structure of the nose hair cutter head installed on the mainframe handle.

[0042] Figure 4 yes Figure 1 sectional view of .

[0043] Figure 5 Yes Figure 1 Schematic diagram of the structure after the cutter head and mounting cover are removed.

[0044] Figure 6 It is a structural diagram of the drive motor.

[0045] Figure 7 Schematic diagram of the internal structure of the mounting cover.

[0046] Figure 8 It is a schematic diagram of the installation structure of the micro switch.

[0047] Fig. 9 It is a structural diagram of a power supply and a power switch.

[0048] Fig.10 It is a structural diagram of the circuit board structure.

[0049] Fig.11 It is a schematic diagram of the structure of the head magnet and the cutter head magnet adsorption.

[0050] Fig.12 It is a schematic diagram of the structure of the head magnet.

[0051] Figure numerals: 1. host handle; 11. micro switch; 12. head magnet; 2. positioning mounting portion; 21. mounting slot; 22. first positioning groove; 23. first positioning convex strip; 3. driving motor; 31. driving shaft; 4. cutter head; 41. razor head; 42. U-shaped cutter head; 43. nose hair cutter head; 44. pressing muscles; 45. cutter head magnet; 5. power supply; 6. power switch; 7. circuit board structure; 8. mounting cover; 81. second positioning groove; 82. second positioning convex strip. DETAILED DESCRIPTION

[0052] In order to make those skilled in the art better understand the present solution, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work should fall within the scope of protection of the present application.

[0053] It should be noted that the terms "first", "second", etc. in the claims and description of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not limited to those steps or units clearly listed, but may also include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0054] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inside", "outside", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate orientation or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those skilled in the art, the specific meanings of these terms in the present application can be understood according to the specific circumstances. In addition, the term "multiple" should mean two or more. It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict.

[0055] The present application will be described in detail below with reference to the accompanying drawings and in combination with embodiments. Example

[0056] This embodiment provides a multifunctional shaver that automatically identifies the type of the blade head by pressing. Figure 1-12 As shown, it includes: a main body handle 1, a driving motor 3, a cutter head 4, a power supply 5, a power switch 6, a micro switch 11, pressing muscles 44 and a circuit board structure 7.

[0057] The main body handle 1 has a positioning and mounting portion 2 at the top; the driving motor 3 is installed inside the main body handle 1, and has a driving shaft 31 extending outward from the middle of the positioning and mounting portion 2; the cutter head 4 is detachably mounted on the positioning and mounting portion 2, and can be driven by the driving shaft 31 after being assembled with the driving shaft 31; the power supply 5 is used to supply power to the driving motor 3; the power switch 6 is connected in series to the circuit in which the power supply 5 supplies power to the driving motor 3; there is at least one micro switch 11, which is arranged on the positioning and mounting portion 2; the pressing muscle 44 is arranged On the cutter head 4, the pressing ribs 44 are arranged at different positions on different types of cutter heads 4; the circuit board structure 7 has circuits for supplying different voltages to the drive motor 3; after different types of cutter heads 4 are installed on the positioning and mounting portion 2, the pressing ribs 44 arranged on the cutter head 4 press the micro switch 11 at the corresponding position, and the micro switch 11 connects the voltage circuit on the circuit board structure 7 that is compatible with the type of cutter head 4. After the power switch 6 is turned on, the cutter head 4 is provided with a corresponding voltage.

[0058] When in use, according to the needs of the user, a cutter head 4 with different functions is selected and installed on the positioning and mounting part 2 of the main body handle 1. The pressing ribs 44 on the cutter head 4 are pressed against the micro switch 11 correspondingly arranged on the positioning and mounting part 2 to identify the type of the installed cutter head 4, and then the circuit with a voltage matching the type of the cutter head 4 on the circuit board structure 7 is directly connected or connected through chip control; the power switch 6 is turned on, and the power supply provides the drive motor 3 with a voltage matching the type of the cutter head 4 through the circuit connected on the circuit board structure 7, and the drive motor 3 drives the drive shaft 31 to rotate, thereby driving the cutter head 4 to work. The multifunctional shaver of this embodiment that automatically identifies the type of the cutter head by pressing does not need to detect the circuit value, and only by pressing the ribs 44 to press the micro switch 11, the type of the cutter head 4 can be simply and quickly identified, and the circuit with a matching voltage is allocated to the drive motor 3 through the circuit board structure 7 to drive the cutter head 4 to work normally.

[0059] The cutter head 4 is detachably mounted on the positioning mounting portion 2 via a mounting cover 8 , and the pressing ribs 44 are arranged on the inner wall of the mounting cover 8 .

[0060] The micro switch 11 is disposed at the end of the positioning and mounting portion 2 . Specifically, a mounting groove 21 is formed at the end of the positioning and mounting portion 2 , and the micro switch 11 is mounted inside the mounting groove 21 .

[0061] like Figure 1 As shown, on the front of the host handle 1, above the power switch 6, there are also indicator lights, which are, from top to bottom, a U-shaped U-blade indicator light, a razor indicator light with lines in a box, a diamond-shaped nose hair cutter indicator light, and a charging indicator light with a battery symbol. When the U-shaped cutter head is installed on the host handle 1, the U-blade indicator light is on, and the shaving indicator light, the nose hair indicator light, and the charging indicator light are off; when other cutter heads are replaced, the indicator light indicating this type of cutter head is on, and the other lights are off; the charging indicator light is only on when charging.

[0062] Preferably, Figure 5 and 7 As shown, it also includes a positioning and mounting structure, which is arranged between the positioning and mounting part 2 and the mounting cover 8; the positioning and mounting structure includes: a first positioning groove 22 and a first positioning ridge 23, which are formed on the outer wall of the positioning and mounting part 2; a second positioning ridge 82 and a second positioning groove 81, which are formed on the inner wall of the mounting cover 8; the first positioning groove 22 can be matched and plugged with the second positioning ridge 82, and the first positioning ridge 23 can be matched and plugged with the second positioning groove 81; when the cutter head 4 is installed on the positioning and mounting part 2 through the mounting cover 8, the positioning ridge and the positioning groove are matched and plugged to realize the positioning of the cutter head 4, so that the pressing rib 44 can be accurately pressed onto the micro switch 11 to avoid misalignment.

[0063] At least two pressing ribs 44 are provided on the cutter head 4. When the cutter head 4 is mounted on the positioning and mounting portion 2, at least two pressing ribs 44 simultaneously press at least two micro switches 11 to connect the circuit on the circuit board structure 7 for supplying corresponding voltage to the cutter head 4 of the corresponding type. When the cutter head 4 of this type is installed, at least two pressing ribs 44 can simultaneously press multiple micro switches 11. When multiple micro switches 11 are pressed at the same time, it means that a cutter head 4 of a certain type is currently installed. By pressing multiple micro switches 11, a specific circuit on the circuit board structure 7 can be connected. When the power supply 5 supplies power to the cutter head 4 through the circuit, a voltage that meets the type of the cutter head 4 can be output to drive the cutter head 4 to work normally. The multifunctional shaver of this embodiment can use multiple pressing ribs 44 to simultaneously press multiple micro switches 11 to determine the type of the cutter head 4 and automatically connect the circuit that can adapt the voltage to the cutter head 4 of this type.

[0064] like Figure 1-3As shown, the cutter head 4 includes at least one of the three types of cutter heads, namely, a razor head 41, a U-shaped cutter head 42 and a nose hair cutter head 43; the razor head 41 is suitable for trimming facial beard, the U-shaped cutter head 42 is suitable for trimming hair, and the nose hair cutter head 43 is suitable for trimming nose hair; users can install different cutter heads 4 according to their needs to perform different tasks.

[0065] like Fig.11 As shown, a head magnet 12 is provided at the end of the positioning mounting portion 2, and a tool head magnet 45 is provided at the corresponding position of the tool head 4. When the tool head 4 is installed on the positioning mounting portion 2, the head magnet 12 and the tool head magnet 45 attract each other, so that the pressing ribs 44 can press on the micro switch 11 with greater force; the mutual attraction of the magnets makes the installation between the positioning mounting portion 2 and the tool head 4 more secure, and also enables the pressing ribs 44 to press on the micro switch 11 with greater force, thereby avoiding the situation where the micro switch 11 is not pressed into place due to too little pressure.

[0066] like Fig.12 As shown, the head magnet 12 is annular and fixedly sleeved around the driving shaft 31 .

[0067] The multifunctional shaver for automatically identifying the type of the cutter head by pressing in the present embodiment is used as follows: when in use, according to the user's needs, a cutter head 4 with different functions is selected and installed on the positioning and mounting part 2 of the main body handle 1, and the pressing ribs 44 on the cutter head 4 are pressed to the micro switch 11 correspondingly arranged on the positioning and mounting part 2 to identify the type of the installed cutter head 4, and then the circuit with a voltage matching the type of the identified cutter head 4 on the circuit board structure 7 is directly connected or connected through chip control; turn on the power switch 6, and the power supply provides the driving motor 3 with a voltage matching the type of the cutter head 4 through the circuit board structure 7, and the driving motor 3 works to drive the driving shaft 31 to rotate, thereby driving the cutter head 4 to work.

[0068] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of this innovative technical solution.

Claims

1. A multifunctional shaver that automatically identifies the type of the blade by pressing, characterized in that: include: A host handle (1) having a positioning and mounting portion (2) at the top end; A drive motor (3) is installed inside the host handle (1) and has a drive shaft (31) extending outward from the middle of the positioning mounting portion (2); A cutter head (4) is detachably mounted on the positioning mounting portion (2) and can be driven by the driving shaft (31) after being assembled with the driving shaft (31); A power supply (5) for supplying power to the drive motor (3); A power switch (6) connected in series to a circuit in which the power source (5) supplies power to the drive motor (3); At least one micro switch (11) is arranged on the positioning mounting portion (2); A pressing rib (44) is arranged on the cutter head (4), and the pressing rib (44) is arranged at different positions on different types of cutter heads (4); A circuit board structure (7) having circuits for supplying different voltages to the drive motor (3); After different types of the cutter heads (4) are mounted on the positioning and mounting portion (2), the pressing ribs (44) provided on the cutter heads (4) press the micro switch (11) at the corresponding position, and the micro switch (11) connects the voltage circuit on the circuit board structure (7) that is compatible with the type of the cutter head (4). When the power switch (6) is turned on, a voltage that is compatible with the cutter head (4) is provided.

2. The multifunctional shaver according to claim 1, characterized in that: The cutter head (4) is detachably mounted on the positioning mounting portion (2) via a mounting cover (8).

3. The multifunctional shaver according to claim 2, characterized in that: The pressing ribs (44) are arranged on the inner wall of the mounting cover (8).

4. The multifunctional shaver according to claim 2 or 3, characterized in that: The micro switch (11) is arranged at the end of the positioning and mounting portion (2).

5. The multifunctional shaver according to claim 4, characterized in that: An installation groove (21) is formed at the end of the positioning installation portion (2), and the micro switch (11) is installed inside the installation groove (21).

6. The multifunctional shaver according to claim 5, characterized in that: It also includes a positioning and mounting structure, which is arranged between the positioning and mounting portion (2) and the mounting cover (8); The positioning and mounting structure comprises: A first positioning groove (22) and / or a first positioning convex strip (23) formed on the outer wall of the positioning and mounting portion (2); A second positioning convex strip (82) and / or a second positioning groove (81) formed on the inner wall of the mounting cover (8); The first positioning groove (22) can be matched and plugged with the second positioning convex strip (82), and the first positioning convex strip (23) can be matched and plugged with the second positioning groove (81).

7. The multifunctional shaver according to claim 1, characterized in that: At least two pressing ribs (44) are provided on the cutter head (4); when the cutter head (4) is mounted on the positioning mounting portion (2), at least two pressing ribs (44) simultaneously press at least two micro switches (11), thereby switching on a circuit on the circuit board structure (7) for supplying a corresponding voltage to the cutter head (4) of a corresponding type.

8. The multifunctional shaver according to claim 1, characterized in that: The blade head (4) comprises at least one of three blade heads: a razor head (41), a U-shaped blade head (42) and a nose hair blade head (43); the razor head (41) is suitable for trimming facial beard, the U-shaped blade head (42) is suitable for trimming hair, and the nose hair blade head (43) is suitable for trimming nose hair.

9. The multifunctional shaver according to claim 1 or 2, characterized in that: A head magnet (12) is provided at the end of the positioning mounting portion (2), and a tool head magnet (45) is provided at a corresponding position of the tool head (4); when the tool head (4) is mounted on the positioning mounting portion (2), the head magnet (12) and the tool head magnet (45) attract each other, so that the pressing muscle (44) can press on the micro switch (11) with a greater force.

10. The multifunctional shaver according to claim 9, characterized in that: The head magnet (12) is annular and fixedly sleeved around the driving shaft (31).

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