Moving cutter fine adjustment structure and hair trimmer

Abstract

The utility model discloses a moving knife fine tuning structure and a hair trimmer, including knife shell, moving knife subassembly and stationary knife, moving knife subassembly back and forth movable connection with knife shell, the knife shell is also equipped with the shift adjusting subassembly, shift adjusting subassembly includes adjusting piece and knob, adjusting piece and knife shell hinge joint, adjusting piece is equipped with guide slot and arc tooth, and the knob is equipped with the guide slot and arc tooth. The rotary knob is provided with a gear meshed with the arc-shaped teeth, the movable cutter assembly is connected with a movable pin shaft in sliding fit with the guide groove, and the cutter shell is provided with a linear groove in front-back sliding connection with the movable pin shaft. The adjusting piece is provided with a plurality of gear holes which are formed at intervals, the gear positioning assembly is further included, and one of the gear holes is selected to be matched with the gear positioning assembly so as to limit the position of the movable cutter assembly relative to the fixed cutter. According to the utility model, the adjusting sheet is driven to move by rotating the knob, so that the moving knife assembly can move back and forth relative to the fixed knife, and a user can operate a longer stroke in the process of switching between two adjacent gears, so that the gear feeling can be enhanced, and the probability of misoperation can be reduced.

Description

Technical Field

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

[0002] The blade design of a hair trimmer usually includes a movable moving blade and a fixed fixed blade, which trim the hair through reciprocating motion. In order to meet the personalized needs of different users for hair cutting length, many electric clippers are equipped with a gear adjustment mechanism on the blade head. This mechanism can adjust the front and rear position of the moving blade relative to the fixed blade, thereby changing the gap between the two and achieving different hair cutting lengths. Existing gear adjustment mechanisms usually use a lever to switch gears, but due to the limitation of the blade head space, the angle between the gears cannot be set too large, resulting in the gear feeling not being obvious when the lever is moved. Users are prone to misoperation during operation and may even inadvertently skip multiple gears, affecting the user experience and hair cutting effect. Utility Model Content

[0003] To solve at least one aspect of the above problems, the present invention first provides a movable knife fine-adjustment structure, comprising a knife housing, a movable knife assembly and a fixed knife connected to the knife housing, the movable knife assembly being movably connected to the knife housing back and forth, the knife housing further being provided with a gear adjustment assembly, the gear adjustment assembly comprising an adjusting plate and a knob, the adjusting plate being hingedly connected to the knife housing, the adjusting plate being provided with a guide groove and arcuate teeth, the knob being provided with a gear meshing with the arcuate teeth, the movable knife assembly being connected to a movable pin that slidably cooperates with the guide groove, and the knife housing being provided with a linear groove slidably connected to the movable pin back and forth; when the knob is rotated, the meshing transmission of the gear and the arcuate teeth drives the adjusting plate to rotate around a hinge point, and the movable knife assembly is moved back and forth relative to the fixed knife under the sliding cooperation of the movable pin, the guide groove and the linear groove; the adjusting plate is provided with a plurality of gear holes arranged at intervals, and further comprises a gear positioning assembly, one of the plurality of gear holes being selected to cooperate with the gear positioning assembly to limit the position of the movable knife assembly relative to the fixed knife.

[0004] Optionally, the guide groove is an arc-shaped groove.

[0005] Optionally, the gear adjustment assembly further includes a hinge shaft, and the adjustment plate is hingedly connected to the blade housing via the hinge shaft.

[0006] Optionally, the center of the arc-shaped teeth is located on the axis of the hinge shaft.

[0007] Optionally, the gear positioning assembly includes a gear spring and a steel ball, and the knife housing is also provided with a mounting block. The front and rear ends of the gear spring are respectively connected to the steel ball and the mounting block. The rear end of the adjusting plate is provided with a plurality of gear holes arranged at intervals, and one of the plurality of gear holes is selected to cooperate with the steel ball for positioning; 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 mounting block is provided with an accommodating cavity connected to the steel ball in a forward and backward sliding manner, and the gear spring is installed in the accommodating cavity; when the steel ball cooperates with the gear hole, part of the steel ball is exposed outside the accommodating cavity.

[0009] Optionally, the knob is movably mounted between the mounting block and the knife housing.

[0010] Optionally, the movable knife assembly includes a movable knife and a slider connected to each other, the slider is installed between the knife housing and the fixed knife for sliding back and forth, and the movable pin is connected to the slider.

[0011] Optionally, protrusions are provided on the left and right sides of the sliding block respectively, and the blade housing is provided with a sliding groove connected to the protrusions for forward and backward sliding.

[0012] Compared with the existing technology, the movable knife fine-tuning structure in the present invention drives the adjustment plate to move by rotating the knob, thereby realizing the forward and backward movement of the movable knife assembly relative to the fixed knife, so that in the process of switching between two adjacent gears, the user can operate a longer stroke, which can enhance the gear sense and reduce the probability of misoperation, especially in the continuous adjustment process, ensuring accurate gear switching; the gear adjustment assembly adopts an arc-shaped tooth and gear meshing design to achieve high-precision transmission and adjustment in a limited space, and has a good compact structure; combined with the dual guidance of the linear groove and the guide groove, the movable knife assembly can move back and forth with higher precision, meeting the user's fine-tuning needs for hair cutting length.

[0013] In addition, the utility model provides a hair trimmer including the movable blade fine-adjustment structure as described above.

[0014] Compared with the prior art, the hair trimmer of the present invention has the same advantages as the above-mentioned movable blade fine-adjustment structure over the prior art, which will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the movable knife fine-adjustment structure of an embodiment of the present utility model;

[0016] Figure 2 This is the local structure of the movable knife fine-tuning structure of the utility model embodiment Figure 1 ;

[0017] Figure 3This is a structural diagram of the movable knife assembly of an embodiment of the present utility model;

[0018] Figure 4 This is the local structure of the movable knife fine-tuning structure of the utility model embodiment Figure 2 .

[0019] Description of reference numerals:

[0020] 1. Blade housing; 11. Linear groove; 12. Slide; 2. Moving knife assembly; 21. Moving knife; 22. Slider; 221. Bump; 3. Fixed knife; 4. Gear adjustment assembly; 41. Adjustment plate; 411. Guide groove; 412. Arc-shaped tooth; 413. Gear hole; 42. Knob; 421. Gear; 43. Articulated shaft; 5. Moving pin; 6. Gear positioning assembly; 61. Gear spring; 62. Steel ball; 7. Mounting block; 71. Accommodating chamber. DETAILED DESCRIPTION

[0021] 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.

[0022] 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.

[0023] The terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. 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 XY, where 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, and the negative direction of the Y axis represents the back.

[0024] The embodiment of the utility model provides a movable knife fine-tuning structure, combined with Figure 1 、 Figure 2 、 Figure 3 、 Figure 4As shown, it includes a knife housing 1, a movable knife assembly 2 and a fixed knife 3 connected to the knife housing 1, the movable knife assembly 2 is movably connected to the knife housing 1 in the front and rear directions, and the knife housing 1 is further equipped with a gear adjustment assembly 4, the gear adjustment assembly 4 includes an adjustment piece 41 and a knob 42, the adjustment piece 41 is hingedly connected to the knife housing 1, the adjustment piece 41 is provided with a guide groove 411 and an arc-shaped tooth 412, the knob 42 is provided with a gear 421 meshing with the arc-shaped tooth 412, the movable knife assembly 2 is connected to a movable pin 5 that slides with the guide groove 411, and the knife housing 1 is provided with a movable pin 5 that slides with the movable pin 5 is connected to the linear slot 11 for sliding forward and backward; when the knob 42 rotates, the gear 421 is engaged with the arc-shaped tooth 412 to drive the adjusting plate 41 to rotate around the hinge point, and the movable knife assembly 2 is moved forward and backward relative to the fixed knife 3 under the sliding cooperation of the movable pin 5, the guide slot 411 and the linear slot 11; the adjusting plate 41 is provided with a plurality of gear holes 413 arranged at intervals, and also includes a gear positioning assembly 6, and one of the plurality of gear holes 413 is selected to cooperate with the gear positioning assembly 6 to limit the position of the movable knife assembly 2 relative to the fixed knife 3.

[0025] Among them, the blade housing 1 is a fixed frame of the entire structure, which is fixedly connected to the fixed blade 3, providing support for the movable blade assembly 2 and the gear adjustment assembly 4, and at the same time, a linear groove 11 is provided to guide the movable pin 5 to slide in the front and rear directions. The linear groove 11 can ensure that the movable pin 5 can only move back and forth; the movable blade assembly 2 can move back and forth relative to the fixed blade 3, and together with the fixed blade 3, realize hair trimming. The movable blade assembly 2 is connected to the movable pin 5, and realizes precise back and forth movement through the sliding cooperation of the guide groove 411 and the linear groove 11; the adjusting piece 41 is connected to the blade housing 1 by a hinged manner, and is provided with a guide groove 411 , used to guide the sliding of the movable pin 5, and an arc-shaped tooth 412 is also provided, which meshes with the gear 421 on the knob 42 to realize the rotational movement of the adjusting piece 41; the outer design of the knob 42 is a grip shape that is convenient for the user to operate; a plurality of gear holes 413 are arranged at intervals along the arc direction on the adjusting piece 41, which are used to cooperate with the gear positioning assembly 6 to limit each gear position and prevent displacement or adjustment error caused by vibration during use; a plurality of gear holes 413 arranged at intervals are used to provide a clear gear position, and each hole corresponds to a fixed position of the movable knife 21 relative to the fixed knife 3.

[0026] The angle between the two gears is generally 5° to 10°. The existing technology uses a lever to directly drive the adjustment plate 41 to rotate to switch gears. The angle of the lever is consistent with the angle between the two gears. That is to say, the user can only dial a very small angle, which easily leads to gear jumping. The present embodiment uses a rotating knob 42 to drive the adjustment plate 41 to rotate to switch gears. By increasing the size of the knob 42 and adjusting the gear 421, a larger operating angle can be achieved. For example, it is necessary to rotate 60° to switch between adjacent gears, and the gear sense is strong. In other words, the design of the present embodiment can make the angle between the two gears smaller, thereby increasing the number of gears.

[0027] When the user rotates the knob 42, the gear 421 engages with the arc-shaped tooth 412 to drive the adjusting plate 41 to rotate around the hinge point; during the rotation of the adjusting plate 41, the guide groove 411 thereon guides the movable pin 5 to slide back and forth, and at the same time the pin moves in the linear groove 11 of the knife housing 1, thereby driving the movable knife assembly 2 to move back and forth relative to the fixed knife 3; after adjusting to the desired position, the gear positioning assembly 6 cooperates with a gear hole 413 of the adjusting plate 41 to lock the position, thereby ensuring the stability of the position of the movable knife assembly 2.

[0028] The movable knife fine-adjustment structure in this embodiment drives the adjustment plate 41 to move by rotating the knob 42, thereby realizing the forward and backward movement of the movable knife assembly 2 relative to the fixed knife 3, so that in the process of switching between two adjacent gears, the user can operate a longer stroke, which can enhance the gear sense and reduce the probability of misoperation, especially in the continuous adjustment process, ensuring accurate gear switching; the gear adjustment assembly 4 adopts the meshing design of arc teeth 412 and gears 421 to achieve high-precision transmission and adjustment in a limited space, and has a good compact structure; combined with the dual guidance of the straight groove 11 and the guide groove 411, the movable knife assembly 2 can move forward and backward with higher precision, meeting the user's fine-tuning needs for hair cutting length.

[0029] Optionally, combined Figure 4 As shown, the guide groove 411 is an arcuate groove. It is not concentric with the arcuate teeth 412. By guiding the arcuate path of the guide pin, the arcuate groove forms a dual constraint with the linear groove 11, ensuring that the movable blade assembly 2 remains stable during adjustment, avoiding jitter or positional shifting and ensuring forward and backward movement of the movable blade assembly 2 relative to the fixed blade 3. The curvature of the arcuate groove helps optimize the transmission ratio between the rotation angle of the adjustment plate 41 and the forward and backward travel of the movable blade assembly 2, reducing adjustment resistance, improving transmission efficiency, and enhancing user experience. Alternatively, the guide groove 411 can be a multi-segment groove.

[0030] Optionally, combined Figure 1 、 Figure 2 、 Figure 4As shown, the gear adjustment assembly 4 further includes a hinge shaft 43, through which the adjustment plate 41 is hingedly connected to the blade housing 1. The hinge shaft 43 passes through the hinged portion between the adjustment plate 41 and the blade housing 1, with one end embedded in the blade housing 1 and the other end engaging with the hinge hole of the adjustment plate 41, providing a stable rotation fulcrum and allowing the adjustment plate 41 to rotate freely about the hinge shaft 43. The structure is simple and compact.

[0031] Optionally, combined Figure 4 As shown, the center of the arc-shaped teeth 412 is located on the axis of the hinge shaft 43. The center of the arc-shaped teeth 412 coincides with the axis of the hinge shaft 43, ensuring that the arc-shaped teeth 412 and the gear 421 of the knob 42 maintain accurate meshing during rotation, ensuring that the adjustment plate 41 rotates more smoothly around the hinge shaft 43, and avoiding uneven movement or meshing jamming caused by eccentricity.

[0032] Optionally, combined Figure 2 、 Figure 4 As shown, the gear positioning assembly 6 includes a gear spring 61 and a steel ball 62, and the knife housing 1 is also provided with a mounting block 7. The front and rear ends of the gear spring 61 are respectively connected to the steel ball 62 and the mounting block 7. The rear end of the adjusting plate 41 is provided with a plurality of gear holes 413 arranged at intervals, and one of the plurality of gear holes 413 is selected to be positioned and matched with the steel ball 62; the center of the circle where the plurality of gear holes 413 are located is the same as the center of the arc-shaped tooth 412.

[0033] Among them, the gear spring 61 is used to provide elastic reset force, and the steel ball 62 is used to cooperate with the gear hole 413 on the adjusting plate 41 to achieve precise gear positioning. The gear spring 61 always provides stable elastic pressure for the steel ball 62; the rear end of the adjusting plate 41 is provided with a plurality of gear holes 413 set at intervals. When the knob 42 is rotated to drive the adjusting plate 41 to rotate, the steel balls 62 will be embedded in the gear holes 413 one by one, forming a clear gear sense, and at the same time fix the position of the adjusting plate 41 to prevent it from being offset due to vibration or external force; the gear holes 413 are arranged in a circular manner, and the center of the circle is the same as the center of the arc tooth 412, thereby ensuring that the steel ball 62 and the gear hole 413 can always be accurately matched during the rotation of the adjusting plate 41.

[0034] Optionally, combined Figure 2 、 Figure 4 As shown, the mounting block 7 is provided with a receiving cavity 71 which is connected to the steel ball 62 for forward and backward sliding, and the gear spring 61 is installed in the receiving cavity 71; when the steel ball 62 cooperates with the gear hole 413, part of the steel ball 62 is exposed outside the receiving cavity 71.

[0035] Among them, the accommodating cavity 71 is a sliding channel that runs through the front and back, and its inner wall is precisely processed to limit the freedom of movement of the steel ball 62, ensuring that the steel ball 62 can only move in the front and back directions to avoid lateral or other direction deviation; one end of the gear spring 61 is supported on the cavity wall, and the other end supports the steel ball 62, providing stable elastic pressure so that the steel ball 62 is always close to the rear end of the adjusting plate 41; the opening of the accommodating cavity 71 is designed so that when it contacts the rear end of the adjusting plate 41, a part of the steel ball 62 can be exposed outside the cavity and cooperate with the gear hole 413 on the adjusting plate 41, thereby realizing the gear positioning function.

[0036] Optionally, combined Figure 1 As shown, the knob 42 is movably mounted between the mounting block 7 and the blade housing 1. The knob 42 is located between the mounting block 7 and the blade housing 1, and can rotate freely therein. The knob 42 has a rotation axis, and a rotation hole that cooperates with the rotation axis is formed between the blade housing 1 and the mounting block 7. The rotation axis can rotate freely in the rotation hole, ensuring stability during rotation. Placing the knob 42 between the mounting block 7 and the blade housing 1 fully utilizes the limited space inside the blade housing 1, making the structure more compact.

[0037] Optionally, combined Figure 2 、 Figure 3 、 Figure 4 As shown, the movable blade assembly 2 includes a movable blade 21 and a slider 22 that are interconnected. The slider 22 is installed to slide back and forth between the blade housing 1 and the fixed blade 3, and the movable pin 5 is connected to the slider 22. The movable blade 21 is connected to the slider 22 via a tension spring. The slider 22 serves as the supporting and moving component of the movable blade 21 and is slidably installed between the blade housing 1 and the fixed blade 3. The slide 22 is slidably mounted between the blade housing 1 and the fixed blade 3, and its movement path is limited to a straight forward and backward direction by the cooperation of the guide structure of the blade housing 1 and the slider 22. The slider 22 slides in cooperation with the linear groove 11 of the blade housing 1 via the movable pin 5, ensuring that the movement path of the movable blade assembly 2 during the adjustment process is stable and accurate, avoiding poor hair cutting results due to movement deviation, and having a simple and reliable structure.

[0038] Optionally, combined Figure 2 、 Figure 3 、 Figure 4 As shown, the left and right sides of the slider 22 are respectively provided with protrusions 221, and the blade housing 1 is provided with a sliding groove 12 connected to the protrusions 221 for sliding back and forth.

[0039] Among them, the function of the protrusion 221 is to cooperate with the slide groove 12 in the knife shell 1 to guide the slider 22 to slide in the front and rear directions and limit its left and right shaking; the protrusion 221 can be designed as a long strip or multiple independent point-shaped protrusions to ensure smooth and stable sliding; the protrusions 221 are symmetrically distributed on the left and right sides of the slider 22 to enhance the balance of the slider 22 and avoid tilting or jamming due to uneven force on one side; the width of the slide groove 12 is slightly larger than the width of the protrusion 221, and an appropriate gap is retained to ensure smooth sliding and avoid excessive shaking; the structural design of the protrusion 221 and the slide groove 12 is simple and the manufacturing cost is low.

[0040] Another embodiment of the present invention provides a hair trimmer including the movable blade fine-adjustment structure described above.

[0041] The hair trimmer in this embodiment drives the adjustment plate 41 to move by rotating the knob 42, thereby achieving the forward and backward movement of the movable blade assembly 2 relative to the fixed blade 3. This allows the user to operate a longer stroke when switching between two adjacent gears, enhances the gear sense, reduces the probability of misoperation, and ensures accurate gear switching, especially during continuous adjustment. The gear adjustment assembly 4 adopts a meshing design of arcuate teeth 412 and gears 421 to achieve high-precision transmission and adjustment in a limited space, and has a good compact structure. Combined with the dual guidance of the linear groove 11 and the guide groove 411, the movable blade assembly 2 can move forward and backward with higher precision, meeting the user's need for fine-tuning of the hair cutting length.

[0042] 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 movable knife fine-tuning structure, characterized in that: The present invention comprises a knife housing (1), a movable knife assembly (2) and a fixed knife (3) connected to the knife housing (1), wherein the movable knife assembly (2) is movably connected to the knife housing (1) in a front-back direction, and the knife housing (1) is further provided with a gear adjustment assembly (4), wherein the gear adjustment assembly (4) comprises an adjustment plate (41) and a knob (42), wherein the adjustment plate (41) is hingedly connected to the knife housing (1), wherein the adjustment plate (41) is provided with a guide groove (411) and an arc-shaped tooth (412), wherein the knob (42) is provided with a gear (421) meshed with the arc-shaped tooth (412), wherein the movable knife assembly (2) is connected with a movable pin shaft (5) which is slidably matched with the guide groove (411), and wherein the knife housing (1) is provided with a gear (421) which is meshed with the arc-shaped tooth (412). The movable pin shaft (5) is connected to the linear groove (11) for sliding back and forth; when the knob (42) rotates, the gear (421) and the arc-shaped tooth (412) are meshed and driven to drive the adjusting plate (41) to rotate around the hinge point, and the movable knife assembly (2) is moved back and forth relative to the fixed knife (3) under the sliding cooperation of the movable pin shaft (5), the guide groove (411) and the linear groove (11); the adjusting plate (41) is provided with a plurality of gear holes (413) arranged at intervals, and also includes a gear positioning assembly (6), and one of the plurality of gear holes (413) is selected to cooperate with the gear positioning assembly (6) to limit the position of the movable knife assembly (2) relative to the fixed knife (3).

2. The movable knife fine-tuning structure according to claim 1, characterized in that: The guide groove (411) is an arc-shaped groove.

3. The movable knife fine-tuning structure according to claim 1, characterized in that: The gear adjustment assembly (4) further comprises a hinge shaft (43), and the adjustment plate (41) is hingedly connected to the blade housing (1) via the hinge shaft (43).

4. The movable knife fine-tuning structure according to claim 3, characterized in that: The center of the arc-shaped teeth (412) is located on the axis of the hinge shaft (43).

5. The movable knife fine-tuning structure according to claim 1, characterized in that: The gear positioning assembly (6) includes a gear spring (61) and a steel ball (62). The knife housing (1) is further provided with a mounting block (7). The front and rear ends of the gear spring (61) are respectively connected to the steel ball (62) and the mounting block (7). The rear end of the adjusting plate (41) is provided with a plurality of gear holes (413) arranged at intervals. One of the plurality of gear holes (413) is selected to be positioned and matched with the steel ball (62); the center of the circle where the plurality of gear holes (413) are located is the same as the center of the arc-shaped tooth (412).

6. The movable knife fine-tuning structure according to claim 5, characterized in that: The mounting block (7) is provided with an accommodating cavity (71) connected to the steel ball (62) in a forward and backward sliding manner, and the shift spring (61) is installed in the accommodating cavity (71); when the steel ball (62) is engaged with the shift hole (413), part of the steel ball (62) is exposed outside the accommodating cavity (71).

7. The movable knife fine-tuning structure according to claim 5, characterized in that: The knob (42) is movably mounted between the mounting block (7) and the knife housing (1).

8. The movable knife fine-tuning structure according to any one of claims 1 to 7, characterized in that: The movable knife assembly (2) comprises a movable knife (21) and a slider (22) connected to each other. The slider (22) is installed between the knife housing (1) and the fixed knife (3) in a forward and backward sliding manner. The movable pin (5) is connected to the slider (22).

9. The movable knife fine-tuning structure according to claim 8, characterized in that: The left and right sides of the slider (22) are respectively provided with protrusions (221), and the knife housing (1) is provided with a sliding groove (12) connected to the protrusions (221) in a front-back sliding manner.

10. A hair trimmer, characterized in that: It comprises the movable knife fine-adjustment structure as described in any one of claims 1-9.

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