Blade adjusting structure and hair trimmer

Abstract

The blade adjusting structure comprises a knife shell, a first blade assembly and a second blade assembly, the first blade assembly is movably connected to the knife shell in a front-back mode, and the first blade assembly is provided with an inclined groove; the cutter further comprises a shifting rod and a moving block which are movably connected with the cutter shell, the shifting rod is movably connected with the moving block, the moving block is provided with a moving pin shaft in sliding fit with the inclined groove, the shifting rod drives the moving block to move left and right when moving, and the first blade assembly moves front and back relative to the second blade assembly under the sliding fit of the moving pin shaft and the inclined groove. By designing a mechanical structure that the chute and the movable pin shaft slide along the chute, the left-right movement of the deflector rod is converted into the front-back movement of the first blade assembly, so that the friction force is reduced, and the adjustment is more labor-saving and smoother; in the trimming process, external force needs to overcome the angle of the skewed slot to push the pin shaft, so that the driving lever is not easy to be driven by reverse external force, the adjusting gear is not easy to change, and the precision and the consistency of hair trimming are guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of hair trimmers, in particular to a blade adjustment structure and a hair trimmer. Background Art

[0002] The blade head of an existing hair trimmer (such as an electric clipper) typically consists of a movable blade and a fixed blade, which trim through reciprocating motion. To meet users' demands for different haircut lengths, some electric clippers are equipped with a lever on the blade head that can adjust the forward and backward position of the movable blade relative to the fixed blade, thereby adjusting the distance between the two. However, this design has a flaw: during use, after the user selects the gear position between the movable blade and the fixed blade, the movable blade is easily moved by contact with the hair during trimming, causing its position relative to the fixed blade to change, thereby causing the gear position to shift, which not only affects the trimming effect but also reduces the user experience. Utility Model Content

[0003] In order to solve at least one aspect of the above problems, the utility model first provides a blade adjustment structure, including a knife housing, a first blade assembly and a second blade assembly connected to the knife housing, the first blade assembly is movably connected to the knife housing back and forth, and the first blade assembly is provided with an oblique groove; it also includes a shift rod and a moving block movably connected to the knife housing, the shift rod is movably connected to the moving block, and the moving block is provided with a moving pin that slides with the oblique groove, and when the shift rod moves, it drives the moving block to move left and right, and the first blade assembly can be moved back and forth relative to the second blade assembly under the sliding cooperation between the moving pin and the oblique groove.

[0004] Optionally, one end of the shift rod is provided with an arc-shaped tooth, and the moving block is provided with a straight tooth engaged with the arc-shaped tooth.

[0005] Optionally, a moving pin is provided at each of the left and right ends of the moving block, and the first blade assembly is correspondingly provided with two inclined grooves, the inclination angles and inclination directions of the two inclined grooves are the same, and the moving pin is matched with the inclined grooves one by one.

[0006] Optionally, a rotating pin is connected to the center of the arc-shaped tooth, and the arc-shaped tooth is hingedly connected to the knife housing through the rotating pin; the moving block is provided with a first waist-shaped hole connected to the rotating pin for left and right sliding.

[0007] Optionally, it also includes a gear spring and a steel ball, the upper and lower ends of the gear spring are respectively connected to the steel ball and the knife housing, the shift lever is provided with a plurality of gear holes, and one of the plurality of gear holes is selected to be positioned and matched with the steel ball; the center of the circle where the plurality of gear holes are located is the same as the center of the arc-shaped tooth.

[0008] Optionally, the second blade assembly includes a fixed blade and a pressing block, wherein the pressing block is located between the blade housing and the fixed blade, and the pressing block is provided with a second waist-shaped hole connected to the movable pin shaft for left and right sliding.

[0009] Optionally, the first blade assembly includes a movable knife group, a tension spring and a slider, the slider is installed on the knife housing for sliding back and forth, one end of the tension spring is installed between the knife housing and the slider, and the other end of the tension spring is connected to the movable knife group.

[0010] Optionally, the tension spring is provided with two torsion springs, one ends of the two torsion springs are connected to each other to form a connecting portion, and the other ends are respectively extended to form spring feet, and the two spring feet are both connected to the movable knife group; the slider is provided with a mounting hole for installing the connecting portion and two mounting slots for installing the torsion springs respectively, and the two torsion springs are located between the slider and the knife housing.

[0011] Optionally, the sliding block is provided with a guide groove and the oblique groove, and the blade housing is provided with a guide column connected to the guide groove for forward and backward sliding.

[0012] Compared with the prior art, the blade adjustment structure of the present invention has an inclination angle design of the inclined groove and a mechanical structure in which the movable pin slides along the inclined groove. When the user adjusts the position of the first blade assembly through the lever, the inclined groove converts the left and right movement of the lever into the forward and backward movement of the first blade assembly. The friction generated is small, and the force transmission path is optimized, making the adjustment action more labor-saving and smooth. The user can easily push the lever to complete the adjustment; when an external force acts on the first blade assembly, for example, during the trimming process, the moving blade encounters resistance from hair or other objects, and the external force attempts to move the first blade assembly in the opposite direction and drive the lever, the reverse external force must overcome the inclination angle of the inclined groove to push the movable pin, that is, a greater force is required to push the lever. In this way, during the trimming process, even if the first blade assembly is subjected to a large external force, the lever is not easily driven, and the adjustment gear will not be easily changed, thereby ensuring the accuracy and consistency of hair cutting.

[0013] In addition, the present invention provides a hair trimmer comprising the blade adjustment structure described above.

[0014] Compared with the prior art, the hair trimmer of the present invention and the above-mentioned blade adjustment structure have the same advantages over the prior art, which will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the blade adjustment structure of an embodiment of the utility model;

[0016] Figure 2 This is the local structure of the blade adjustment structure of the embodiment of the utility model Figure 1 ;

[0017] Figure 3 This is the local structure of the blade adjustment structure of the embodiment of the utility model Figure 2 ;

[0018] Figure 4 This is the local structure of the blade adjustment structure of the embodiment of the utility model Figure 3 ;

[0019] Figure 5 This is the local structure of the blade adjustment structure of the embodiment of the utility model Figure 4 .

[0020] Description of reference numerals:

[0021] 1. Blade housing; 11. Guide column; 2. First blade assembly; 21. Moving blade assembly; 22. Tension spring; 221. Torsion spring; 222. Connecting part; 223. Spring foot; 23. Slider; 231. Bevel groove; 232. Mounting hole; 233. Mounting slot; 234. Guide slot; 3. Second blade assembly; 31. Fixed blade; 32. Pressing block; 321. Second waist-shaped hole; 4. Push rod; 41. Arc teeth; 42. Rotating pin; 43. Shift hole; 5. Moving block; 51. Moving pin; 52. Straight teeth; 53. First waist-shaped hole; 6. Shift spring; 7. Steel ball. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0023] In the description of the present invention, it should be understood that the terms "upper" and "lower" and the like indicate positions or location relationships based on the positions or location relationships during normal use of the product.

[0024] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. The drawings of the embodiments of the present invention are provided with a coordinate system XYZ, wherein the positive direction of the X-axis represents the left, the negative direction of the X-axis represents the right, the positive direction of the Y-axis represents the front, the negative direction of the Y-axis represents the back, the positive direction of the Z-axis represents the top, and the negative direction of the Z-axis represents the bottom.

[0025] The utility model provides a blade adjustment structure, combined with Figures 1 to 4As shown, it includes a knife housing 1, a first blade assembly 2 and a second blade assembly 3 connected to the knife housing 1, the first blade assembly 2 is movably connected to the knife housing 1 front and back, and the first blade assembly 2 is provided with an oblique groove 231; it also includes a shift rod 4 and a moving block 5 movably connected to the knife housing 1, the shift rod 4 is movably connected to the moving block 5, and the moving block 5 is provided with a moving pin 51 that slides with the oblique groove 231. When the shift rod 4 moves, it drives the moving block 5 to move left and right, and the first blade assembly 2 can move forward and backward relative to the second blade assembly 3 under the sliding cooperation between the moving pin 51 and the oblique groove 231.

[0026] Among them, the first blade assembly 2 can be a movable blade or a fixed blade. In this embodiment, the movable blade is preferably used. The first blade assembly 2 is preferably a fixed blade, which is a movable part for trimming hair. Its forward and backward movement determines the distance between the movable blade and the fixed blade, thereby adjusting the hair cutting length; the inclined groove 231 on the first blade assembly 2 is a long guide groove 234 designed at an inclined angle. The inclined groove 231 cooperates with the movable pin 51 to convert the left and right movement of the movable block 5 into the forward and backward movement of the first blade assembly 2; the shift lever 4 has a certain length, and one end of the shift lever 4 extends outside the blade housing 1. It is an external control component used by the user to adjust the blade position. It is movably connected to the movable block 5. When the user pushes the shift lever 4, the movable block 5 slides left and right, thereby driving the movable pin 51 to move along the inclined groove 231 of the first blade assembly 2, thereby realizing the forward and backward movement of the first blade assembly 2 relative to the second blade assembly 3; the structural design inside the blade housing 1 provides space for the movable block 5 and the shift lever 4 to ensure the smooth operation of the adjustment action.

[0027] In the blade adjustment structure of this embodiment, due to the inclined angle design of the inclined groove 231 and the mechanical structure of the movable pin 51 sliding along the inclined groove 231, when the user adjusts the position of the first blade assembly 2 through the lever 4, the inclined groove 231 converts the left and right movement of the lever 4 into the forward and backward movement of the first blade assembly 2, resulting in less friction and an optimized force transmission path, making the adjustment action more labor-saving and smooth, and the user can easily push the lever 4 to complete the adjustment; when an external force acts on the first blade assembly 2, for example, during the trimming process, the movable blade encounters resistance from hair or other objects, and the external force attempts to move the first blade assembly 2 in the opposite direction and drive the lever 4, the reverse external force must overcome the inclined angle of the inclined groove 231 to push the movable pin 51, that is, a large force is required to push the lever 4. In this way, even if the first blade assembly 2 is subjected to a large external force during the trimming process, the lever 4 is not easily moved, and the adjustment gear will not be easily changed, thereby ensuring the accuracy and consistency of hair cutting.

[0028] Optionally, combined Figure 3As shown, one end of the shift lever 4 is provided with an arc-shaped tooth 41 , which is located on the movement path of the shift lever 4 and arranged in an arc shape. The moving block 5 is provided with a straight tooth 52 meshing with the arc-shaped tooth 41 .

[0029] Among them, the design of the arcuate teeth 41 conforms to the natural movement trajectory of the lever 4. When the user pulls the lever 4, the arcuate teeth 41 will rotate around a certain central axis. This arc structure can maintain good meshing with the straight teeth 52 on the moving block 5; the straight teeth 52 are located in the middle position of the moving block 5 and are arranged on one side of the moving block 5. When the user pulls the lever 4, the arcuate teeth 41 rotate and drive the straight teeth 52 to move together, thereby pushing the moving block 5 to move left and right; the meshing structure of the straight teeth 52 and the arcuate teeth 41 can effectively convert the rotational motion of the lever 4 into the linear motion of the moving block 5, reduce the loss of force, and improve the efficiency of adjustment, so that the user saves effort when pulling the lever 4, and the adjustment of the lever 4 is also more precise.

[0030] Optionally, combined Figure 3 、 Figure 4 、 Figure 5 As shown, the left and right ends of the movable block 5 are each provided with a movable pin 51, and the first blade assembly 2 is correspondingly provided with two inclined slots 231. The inclination angle and inclination direction of the two inclined slots 231 are the same, and the movable pins 51 correspond to the inclined slots 231 one by one. The movable pins 51 at the left and right ends ensure that the movable block 5 can more stably drive the first blade assembly 2 to move forward and backward during movement; the two inclined slots 231 respectively cooperate with the movable pins 51 at the left and right ends of the movable block 5 to form a two-point guide, ensuring that the first blade assembly 2 does not tilt or deflect when moving forward and backward; the two movable pins 51 share the force of the movement of the lever 4, making the entire adjustment process smoother and improving the accuracy of blade adjustment.

[0031] Optionally, combined Figure 3 、 Figure 5As shown, a rotating pin 42 is connected to the center of the arc-shaped tooth 41, and the arc-shaped tooth 41 is hingedly connected to the knife housing 1 through the rotating pin 42. The rotating pin 42 fixes the arc-shaped tooth 41 on the knife housing 1 and is hingedly connected to the knife housing 1, so that the shift lever 4 can swing left and right within a certain range. The rotating pin 42 acts as a fulcrum of the arc-shaped tooth 41, ensuring that the arc-shaped tooth 41 can stably rotate around this center point when the shift lever 4 is moved; the moving block 5 is provided with a first waist-shaped hole 53 connected to the rotating pin 42 for left and right sliding. The waist-shaped hole is long and narrow, allowing the rotating pin 42 to slide left and right within a certain range in the moving block 5 to adapt to the rotational movement of the arc-shaped tooth 41, and at the same time allowing the moving block 5 to move left and right under the drive of the shift lever 4. The sliding connection design between the first waist-shaped hole 53 and the rotating pin 42 makes the arc-shaped rotational motion of the shift lever 4 and the linear motion of the moving block 5 perfectly compatible, reducing friction and stress concentration between mechanical parts, lowering the wear rate, and extending the service life of the adjustment mechanism.

[0032] Optionally, combined Figure 4 、 Figure 5 As shown, it also includes a gear spring 6 and a steel ball 7. The upper and lower ends of the gear spring 6 are respectively connected to the steel ball 7 and the knife housing 1, that is, the steel ball 7 maintains a certain elastic force through the elastic action of the gear spring 6. The shift lever 4 is provided with a plurality of gear holes 43. One of the plurality of gear holes 43 is selected to be positioned and matched with the steel ball 7. The steel ball 7 is pressed downward into the gear hole 43 on the shift lever 4 by the elastic force of the gear spring 6, ensuring that the shift lever 4 can be firmly locked at a specific gear position. The plurality of gear holes 43 are distributed along the rotation path of the shift lever 4, and the positions of the gear holes 43 are arranged in a circular shape; the center of the circle where the plurality of gear holes 43 are located is the same as the center of the arc-shaped tooth 41, so that the distribution of the gear holes 43 is completely consistent with the rotation trajectory of the shift lever 4. When the shift lever 4 rotates, the steel balls 7 can be stuck in different gear holes 43 one by one to achieve precise adjustment of the blade position. The introduction of the gear spring 6 and steel ball 7 structure provides a clear gear positioning mechanism for the lever 4, and multiple gear holes 43 provide users with different options, ensuring that the blade position can be accurately adjusted and locked; the locking structure formed by the steel ball 7 and the gear hole 43 provides the user with a clear adjustment feedback. When the lever 4 moves to each gear, the user can feel the clear "locking" feeling of the gear. This feedback enhances the user's sense of control and operating experience; the precise cooperation between the steel ball 7 and the gear hole 43 ensures that the lever 4 can be stably locked in a specific gear after adjustment, and it is not easy for the gear to change due to external force or vibration.

[0033] Optionally, combined Figure 2 、 Figure 4As shown, the second blade assembly 3 includes a fixed blade 31 and a pressure block 32. The fixed blade 31 is a fixed cutting blade, which is used to cooperate with the movable blade in the first blade assembly 2 to complete the hair cutting task. The pressure block 32 is located between the blade housing 1 and the fixed blade 31. The pressure block 32 is provided with a second waist-shaped hole 321 that is connected to the movable pin 51 for left and right sliding. The second waist-shaped hole 321 allows the movable pin 51 to slide left and right in the pressure block 32, ensuring that during the adjustment process, the pressure block 32 can adapt to the movement of the movable pin 51 without restricting or affecting the adjustment action of the first blade assembly 2, ensuring that the entire adjustment process is smooth.

[0034] Optionally, combined Figures 2 to 5 As shown, the first blade assembly 2 includes a movable blade group 21, a tension spring 22 and a slider 23. The movable blade group 21 is a blade part that can move back and forth relative to the fixed blade 31 for cutting hair. The slider 23 is installed on the blade housing 1 for sliding back and forth, and can slide back and forth along the guide rail or specific sliding path of the blade housing 1. The back and forth sliding of the slider 23 directly affects the front and back position of the movable blade group 21, thereby controlling the distance between the movable blade and the fixed blade 31; one end of the tension spring 22 is installed between the blade housing 1 and the slider 23, and the other end of the tension spring 22 is connected to the movable blade group 21 to control the tension and stability of the movable blade group 21. When the slider 23 slides back and forth, the tension spring 22 controls the tensioning force of the movable blade group 21, so that the movable blade group 21 remains stable during the back and forth movement and provides a certain reset ability. Through the cooperation of the slider 23 and the tension spring 22, the movable blade can maintain stable forward and backward movement. The guiding function of the slider 23 ensures the accuracy of adjustment, and the tension control of the tension spring 22 enables the blade to maintain an appropriate tension state after adjustment to avoid looseness or overtightening.

[0035] Optionally, combined Figure 3 、 Figure 4As shown, the tension spring 22 comprises two torsion springs 221. One end of the two torsion springs 221 is connected to form a connecting portion 222, forming an integral fixed structure. The other end extends to form a spring foot 223. Both spring feet 223 are connected to the movable blade assembly 21 and provide tensioning force on the movable blade. The slider 23 is provided with a mounting hole 232 for mounting the connecting portion 222 and two mounting slots 233 for mounting the torsion springs 221. The two torsion springs 221 are located between the slider 23 and the blade housing 1. The mounting holes 232 ensure that the two torsion springs 221 are securely mounted on the slider 23. The main body of the torsion spring 221 is mounted within the mounting slots 233, ensuring that the torsion springs 221 are fixed between the slider 23 and the blade housing 1 and functioning properly. This allows the torsion springs 221 to fully exert their tensioning function during blade adjustment. Assembling the tension spring 22 is simple, as the tension spring 22 does not need to be forcibly pressed into the blade housing 1, saving effort during assembly.

[0036] Optionally, combined Figure 4 、 Figure 5 As shown, the slider 23 is provided with a guide groove 234 and the inclined groove 231, and the knife housing 1 is provided with a guide column 11 connected to the guide groove 234 for forward and backward sliding; the guide groove 234 is used to guide the slider 23 to slide forward and backward in the knife housing 1, ensuring that the slider 23 slides along a fixed path to avoid left and right deviation or shaking; through the cooperation of the guide groove 234 and the guide column 11, the sliding direction of the slider 23 inside the knife housing 1 is precisely controlled and can only move in the forward and backward direction.

[0037] Another embodiment of the present invention provides a hair trimmer including the blade adjustment structure described above.

[0038] In the hair trimmer of the present invention, due to the inclined angle design of the inclined groove 231 and the mechanical structure of the movable pin 51 sliding along the inclined groove 231, when the user adjusts the position of the first blade assembly 2 through the lever 4, the inclined groove 231 converts the left and right movement of the lever 4 into the forward and backward movement of the first blade assembly 2, resulting in less friction and an optimized force transmission path, making the adjustment action more labor-saving and smooth, and the user can easily push the lever 4 to complete the adjustment; when an external force acts on the first blade assembly 2, for example, during the trimming process, the movable blade encounters resistance from hair or other objects, and the external force attempts to move the first blade assembly 2 in the opposite direction and drive the lever 4, the reverse external force must overcome the inclined angle of the inclined groove 231 to push the movable pin 51, that is, a large force is required to push the lever 4. In this way, during the trimming process, even if the first blade assembly 2 is subjected to a large external force, the lever 4 is not easily moved, and the adjustment gear position will not be easily changed, thereby ensuring the accuracy and consistency of hair cutting.

[0039] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited thereto. Those skilled in the art may make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present utility model.

Claims

1. A blade adjustment structure, characterized in that: The utility model comprises a knife housing (1), a first blade assembly (2) and a second blade assembly (3) connected to the knife housing (1), wherein the first blade assembly (2) is movably connected to the knife housing (1) in a forward and backward manner, and the first blade assembly (2) is provided with an inclined slot (231); and further comprises a shifting rod (4) and a moving block (5) movably connected to the knife housing (1), wherein the shifting rod (4) is movably connected to the moving block (5), and the moving block (5) is provided with a moving pin (51) which is slidably engaged with the inclined slot (231). When the shifting rod (4) moves, the moving block (5) is driven to move left and right, and the first blade assembly (2) is moved forward and backward relative to the second blade assembly (3) under the sliding engagement of the moving pin (51) and the inclined slot (231).

2. The blade adjustment structure according to claim 1, characterized in that: One end of the shifting rod (4) is provided with an arc-shaped tooth (41), and the moving block (5) is provided with a straight tooth (52) meshing with the arc-shaped tooth (41).

3. The blade adjustment structure according to claim 2, characterized in that: The movable block (5) is provided with a movable pin shaft (51) at the left and right ends respectively, and the first blade assembly (2) is provided with two inclined grooves (231) correspondingly, and the inclination angles and inclination directions of the two inclined grooves (231) are the same, and the movable pin shaft (51) and the inclined grooves (231) are matched one by one.

4. The blade adjustment structure according to claim 2, characterized in that: A rotating pin (42) is connected to the center of the arc-shaped tooth (41), and the arc-shaped tooth (41) is hingedly connected to the knife housing (1) through the rotating pin (42); the moving block (5) is provided with a first waist-shaped hole (53) connected to the rotating pin (42) for left and right sliding.

5. The blade adjustment structure according to claim 4, characterized in that: The utility model further comprises a gear spring (6) and a steel ball (7), wherein the upper and lower ends of the gear spring (6) are respectively connected to the steel ball (7) and the knife housing (1), and the shift lever (4) is provided with a plurality of gear holes (43), and one of the plurality of gear holes (43) is selected to be positioned and matched with the steel ball (7); the center of the circle where the plurality of gear holes (43) are located is the same as the center of the arc-shaped tooth (41).

6. The blade adjustment structure according to claim 1, characterized in that: The second blade assembly (3) comprises a fixed blade (31) and a pressing block (32), wherein the pressing block (32) is located between the blade housing (1) and the fixed blade (31), and the pressing block (32) is provided with a second waist-shaped hole (321) connected to the movable pin shaft (51) for left and right sliding.

7. The blade adjustment structure according to any one of claims 1 to 6, characterized in that: The first blade assembly (2) comprises a movable blade assembly (21), a tension spring (22) and a slider (23); the slider (23) is mounted on the blade housing (1) in a forward and backward sliding manner; one end of the tension spring (22) is mounted between the blade housing (1) and the slider (23); and the other end of the tension spring (22) is connected to the movable blade assembly (21).

8. The blade adjustment structure according to claim 7, characterized in that: The tension spring (22) is provided with two torsion springs (221), one end of the two torsion springs (221) are connected to each other to form a connecting portion (222), and the other end is extended to form a spring foot (223), and the two spring feet (223) are both connected to the movable knife group (21); the slider (23) is provided with a mounting hole (232) for mounting the connecting portion (222) and two mounting grooves (233) for mounting the torsion springs (221), and the two torsion springs (221) are located between the slider (23) and the knife housing (1).

9. The blade adjustment structure according to claim 7, characterized in that: The slide block (23) is provided with a guide groove (234) and the inclined groove (231), and the knife housing (1) is provided with a guide column (11) connected to the guide groove (234) in a forward and backward sliding manner.

10. A hair trimmer, characterized in that: The utility model comprises a blade adjustment structure according to any one of claims 1 to 9.

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