Pruning cutter head assembly

Abstract

The invention provides a trimming cutter head assembly which comprises a static cutter provided with a static cutter shearing part, and static cutter teeth are formed on the static cutter shearing part; the movable cutter can move relative to the static cutter, the movable cutter is provided with two movable blades, the two movable blades are connected into a whole, movable cutter tooth parts are arranged at the same ends of the two movable blades, movable cutter teeth are formed by the movable cutter tooth parts, and the two movable cutter tooth parts jointly form a movable cutter shearing part matched with the static cutter shearing part; the supporting limiting piece is installed on the static cutter or the movable cutter and can enable the static cutter shearing part and the movable cutter shearing part to be limited in a gap in the direction perpendicular to the moving direction of the movable cutter. According to the hair trimming equipment, the forming difficulty of the moving cutter is low, elastic limiting is formed between the moving cutter and the static cutter, and size control is more convenient during specific implementation; bending deformation generated after the blade is used for a long time is effectively avoided, the structural stability is high, and the efficiency of hair cutting operation is guaranteed. And the temperature rise of the blade after long-time use is greatly reduced, and the noise is low.

Description

[0001] This application is a divisional application. The application date of the original application is 2020-06-05, the application number is 2020105067357, and the name of the invention is cutting component of hair trimming device. Technical Field

[0002] The invention relates to a trimming head assembly of a hair cutting (shaving) appliance. Background Art

[0003] CN205238089U discloses a fixed blade and a blade set for a hair cutting device. The blade set includes a fixed blade and a movable cutting blade, the movable cutting blade includes a toothed front edge, and the movable cutting blade is movably arranged in a guide groove defined by the fixed blade, so that when the movable cutting blade and the fixed blade move relative to each other, the at least one toothed front edge of the movable cutting blade cooperates with the corresponding teeth of the fixed blade, so that the hair captured during the cutting action can be cut. The movable cutting blade is limited by the fixed blade and the retaining part. The movable cutting blade is movably arranged in the guide groove of the fixed blade, and the movable cutting blade is completely limited and controlled by the fixed blade and the retaining part, which has high dimensional accuracy requirements and is difficult to control in production; in addition, the upper and lower surfaces of the movable cutting blade are fixed between the fixed blade and the retaining part in the form of surface contact, and the overall contact area is large, the temperature rise is high, and the noise is high during the shaving operation. Summary of the invention

[0004] In view of this, the present invention provides a trimming head assembly that is not prone to hair pulling, has a good cutting effect, is convenient for process control, and is highly comfortable to use.

[0005] To achieve the above object, the present invention provides the following technical solution: a trimming head assembly, comprising:

[0006] A stationary knife having a stationary knife shearing portion, wherein the stationary knife shearing portion is formed with stationary knife teeth;

[0007] A movable knife capable of relative movement with the stationary knife, the movable knife having at least two movable blades, the movable blades being connected as a whole, the same end of the movable blades being provided with movable blade teeth, the movable blade teeth forming a movable blade shearing portion cooperating with the stationary knife shearing portion;

[0008] The support limiter is installed on the stationary knife or the moving knife and can limit the gap between the stationary knife shearing part and the moving knife shearing part in the vertical moving direction of the moving knife, and the support limiter is in point contact or line contact with the moving knife or the stationary knife; wherein,

[0009] The supporting limiter is a spring sheet, which has at least one elastic support part that forms a point contact limit or a line contact limit with the stationary knife or the moving knife. The elastic support part has a pre-compression elastic force perpendicular to the moving direction of the moving knife, and the elastic support part limits the moving knife in the direction perpendicular to the moving direction of the moving knife, thereby limiting the distance between the moving knife shearing part and the stationary knife shearing part.

[0010] Preferably, the gap between the stationary knife shearing part and the movable knife shearing part in the direction perpendicular to the moving direction of the movable knife is ≤0.05 mm.

[0011] Preferably, the stationary knife includes two relatively parallel stationary knife walls, and the stationary knife shearing portion is connected between the two stationary knife walls; each moving knife blade includes a moving knife wall, and the moving knife tooth portion is formed at one end of the moving knife wall corresponding to the stationary knife shearing portion, and the moving knife wall is parallel to the stationary knife wall.

[0012] Preferably, two movable blades are provided, a connecting piece is provided between the two movable blades, the connecting piece is an injection-molded connecting piece, the stationary blade shearing portion is perpendicular to the stationary blade wall, and the movable blade wall is perpendicular to the plane where the movable blade shearing portion is located.

[0013] Preferably, the stationary knife has a mounting portion for mounting the support and limiting member, and the movable knife is located on the support and limiting member.

[0014] Preferably, the mounting portion is a hole or a groove formed in the stationary knife, and the support and limiting member is connected to the stationary knife through the hole or the groove.

[0015] The beneficial effects of the present invention are as follows: the moving knife of the cutting assembly of the hair trimming device described in the present invention has low molding difficulty, and an elastic limit is formed between the moving knife and the stationary knife, which makes it more convenient to control the size during specific implementation; the bending deformation of the blade after long-term use is effectively avoided, the structural stability is high, and the efficiency of the hair cutting operation is guaranteed; the supporting limit member forms an elastic point contact or line contact limit with the moving knife or the stationary knife, which reduces the contact area between each other, greatly reduces the temperature rise of the blade after long-term use, and has low noise. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Attached Figure 1 A three-dimensional view of the trimming head assembly of the present invention

[0017] Attached Figure 2 Exploded view of the trimming head assembly of the present invention

[0018] Attached Figure 3 A side view of the trimming head assembly of the present invention

[0019] Attached Figure 4 This is a cross-sectional structural diagram of the trimming head assembly of the present invention.

[0020] Attached Figure 5A perspective view of another embodiment of the pruning head assembly of the present invention

[0021] Attached Figure 6 A side view of another embodiment of the pruning head assembly of the present invention

[0022] Attached Figure 7 A cross-sectional structural diagram of another embodiment of the trimming head assembly of the present invention

[0023] Attached Figure 8 An exploded view of another embodiment of the pruning head assembly of the present invention

[0024] Attached Fig. 9 A perspective view of a third embodiment of a trimming head assembly of the present invention

[0025] Attached Fig.10 This is an exploded view of the fourth embodiment of the pruning head assembly of the present invention.

[0026] Attached Fig.11 for Fig. 9 Enlarged view of point A

[0027] Attached Fig.12 Schematic diagram of the structure of the moving knife

[0028] Attached Fig.13 A three-dimensional assembly diagram of a fourth embodiment of the pruning head assembly of the present invention

[0029] Attached Fig.14 A side view of the fourth embodiment of the trimming head assembly of the present invention DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] As attached Figures 1 to 14 As shown, a trimming head assembly for a hair trimming device includes: a stationary knife 1, a movable knife 2, and a support limiter 10. The stationary knife 1 has a stationary knife shearing portion 3, and the stationary knife shearing portion 3 is formed with stationary knife teeth 4; the movable knife 2 can move relative to the stationary knife 1, and in this embodiment, the reciprocating motion of the movable knife 2 relative to the stationary knife 1 is taken as an example for illustration. The movable knife 2 has at least two movable blades 5. In this embodiment, two movable blades 5 are provided as an example for illustration, and the two movable blades 5 are connected as a whole, and the two movable blades 5 can be fixedly connected, and the connection method is injection molding, welding, hot melting, or bonding. It can also be a detachable connection such as a snap, riveting, or connection through other connecting parts. As Figures 9-11As shown, a connector 6 can be provided between the two movable blades, and the connector 6 is an injection molded connector. A movable blade tooth portion 7 is provided at the same end of the two movable blades 5, and the movable blade tooth portion 7 is formed with movable blade teeth 8. The two movable blade tooth portions 7 together form a movable blade shearing portion 9 that cooperates with the stationary blade shearing portion 3; a support limiter 10 is installed on the stationary blade 1 or the movable blade 2 and can limit the gap between the stationary blade shearing portion 3 and the movable blade shearing portion 9 in a direction perpendicular to the moving direction of the movable blade 2. Of course, the movable blade 2 can also be provided with multiple movable blades 5, such as Fig.12 As shown, the movable knife 2 is composed of three movable blades 5.

[0032] The stationary knife 1 includes two relatively parallel stationary knife walls 11, the stationary knife shearing portion 3 is connected between the two stationary knife walls 11, each movable knife blade 5 includes a movable knife wall 12, and the movable knife tooth portion 7 is formed at one end of the movable knife wall 12 corresponding to the stationary knife shearing portion 3, and the movable knife wall 12 is parallel to the stationary knife wall 11.

[0033] The connecting piece 6 is an injection-molded connecting piece, that is, the connecting piece 6 is formed between the two moving blades 5 by injection molding, thereby connecting the moving blades 5 as a whole. The stationary blade shearing portion 3 is perpendicular to the stationary blade wall 11, and the moving blade wall 12 is perpendicular to the plane where the moving blade shearing portion 9 is located. The moving blade 2 is configured to be connected as a whole by two moving blades 5 through an injection-molded piece. When the moving blade is formed, the process only needs to bend the corresponding moving blades 5 separately, and then the two moving blades 5 are connected by injection molding. Compared with the common integrated moving blade structure in the prior art, the forming is more convenient and the forming process is also simpler.

[0034] In this embodiment, the stationary knife shearing portion 3 is in a planar shape, that is, the shearing surface where the stationary knife shearing portion 3 is located is a plane; the movable knife shearing portion 9 is in a planar shape parallel to the stationary knife shearing portion 3, that is, the shearing surface where the movable knife shearing portion 9 is located is also a plane. In specific implementation, this is not a limitation, and the stationary knife shearing portion 3 and the movable knife shearing portion 9 can both be set to a curved surface (arc surface), or one of them can be set to a curved surface and the other can be set to a plane.

[0035] like Fig.13 , 14 As shown, the stationary knife shearing portion 3 forms a stationary knife shearing surface 31, and the stationary knife shearing surface 31 is obliquely connected between the two stationary knife walls 11. The moving knife shearing portion 9 forms a moving knife shearing surface 91, and the moving knife shearing surface 91 is parallel to the stationary knife shearing surface 31. The stationary knife wall 11 can be only one stationary knife wall 11, and the stationary knife shearing surface 31 is formed in the stationary knife shearing portion 3. The stationary knife shearing surface 31 is inclined with the stationary knife wall 11, and the moving knife shearing surface 91 is parallel to the stationary knife shearing surface 31.

[0036] The gap between the stationary knife shearing part 3 and the moving knife shearing part 9 in the direction perpendicular to the moving knife 2 is ≤0.05mm. In other words, the gap between the moving knife shearing part 9 and the stationary knife shearing part 3 in the direction perpendicular to the shearing is 0 to 0.05mm. Under the action of the support stopper 10, the stationary knife shearing part 3 and the moving knife shearing part 9 can be in close contact with each other, or they can maintain a distance of ≤0.05mm.

[0037] In this embodiment, the reciprocating movement of the movable knife 2 relative to the stationary knife 1 is used as an example for explanation. In specific implementation, the two can also rotate relative to each other, which is not limited to this.

[0038] The support stopper 10 is in point contact or line contact with the moving blade 2 or the stationary blade 1. Compared with the surface contact stopper in the prior art, this arrangement can effectively reduce the friction resistance of the blade set, reduce the temperature rise, and generally increase the service life of the blade set with low noise.

[0039] The stationary knife 1 has a mounting portion 23 for mounting the support and stopper 10, and the movable knife 2 is supported on the support and stopper 10. The mounting portion 23 is a hole or a groove formed on the stationary knife 1, and the support and stopper 10 is connected to the stationary knife 1 through the hole or the groove.

[0040] The seven components of the hair trimming device of the present invention will be further described below in conjunction with several different structures of support and limiting members 10 .

[0041] like Figures 1 to 4 As shown, the structure of one of the support and limit members 10 is shown, the mounting portion 23 is a mounting groove provided in the stationary knife wall 11, and the two ends of the support and limit member 10 are located in the mounting groove and fixedly connected to the stationary knife wall 11. The support and limit member 10 is a spring sheet 13, and the spring sheet 13 has at least one elastic support portion 14 that forms a point contact limit or a line contact limit with the stationary knife 1 or the moving knife 2, and the elastic support portion 14 has a pre-compression elastic force perpendicular to the moving direction of the moving knife 2, and the elastic support portion 14 limits the moving knife 2 perpendicular to the moving direction of the moving knife 2, thereby limiting the distance between the moving knife shearing portion 9 and the stationary knife shearing portion 3; in this way, the spring sheet 13 can not only fix the moving knife 2 so that the moving knife 2 can swing back and forth and be fixed in the stationary knife 1 to form a whole with the stationary knife 1, but also ensure that the moving knife shearing portion 9 of the moving knife 2 and the stationary knife shearing portion 3 of the stationary knife 1 are kept in contact or with a certain gap.

[0042] The elastic support part 14 is curved or arched, and the movable knife 2 is supported on the top surface of the elastic support part 14 to form a point contact limit or a line contact limit with the elastic support part 14. After such arrangement, the contact area between the movable knife and the elastic support part 14 is reduced, and the temperature rise after long-term use is greatly reduced.

[0043] In actual production, the elastic support part 14 has two structures that are the same as the spring pieces 13 in the following embodiment. The two elastic support parts 14 (equivalent to the arc-shaped connecting part 132 in the following embodiment) are symmetrically arranged along the positioning groove 16 set in the center, and connecting ends 131 are provided on the outer sides of the two elastic support parts 14. During assembly, the connecting ends 131 are inserted into the mounting parts 23 set on the stationary knife wall 11 so that the two ends of the spring piece 13 can be detachably fixed to the stationary knife 1.

[0044] As attached Figures 5 to 9 As shown, another structure of the support and limit member 10 is shown. Similarly, the mounting portion 23 is a mounting groove provided in the stationary knife wall 11, and the support and limit member 10 is located in the mounting groove. The support and limit member 10 includes a spring piece 13 and a support member 15, the spring piece 13 has a positioning groove 16, the support member 15 is located in the positioning groove 16, the support member 15 forms a point contact or a line contact with the moving knife 2 or the stationary knife 1, and the displacement of the moving knife 2 in the direction perpendicular to the moving direction of the moving knife 2 is limited by the support member 15. The spring piece 13 has an elastic force that makes the moving knife shearing portion 9 and the stationary knife shearing portion 3 approach each other, and the moving knife 2 is limited by the support member 15.

[0045] Specifically, the spring piece 13 is located in the installation groove, and the spring piece 13 includes two connecting ends 131 that extend into the two ends of the installation groove for limiting positioning, and two arc-shaped connecting parts 132 that extend from the connecting ends 131 toward the center of the spring piece 13 respectively. The arc-shaped connecting parts 132 accumulate elastic potential energy that makes the movable knife shearing part 9 close to the stationary knife shearing part 4. The positioning groove 16 is located between the two arc-shaped connecting parts 132. The movable knife 2 is supported on the upper part of the support member 15 and is in point or line contact with the support member 15.

[0046] In this embodiment, the support member 15 is installed on the stationary knife 1 as an example. The support member 15 can also be installed on the moving knife 2, and the stationary knife 1 is used for support and limiting. The stationary knife 1 is in point or line contact with the bottom of the support member 15.

[0047] The support member 15 may be a cylinder or a ball (sphere), but this is not a limitation, as long as the support member 15 can form a point or line contact support limit with the stationary knife 1 or the movable knife 2, therefore, the support member 15 may also be a triangle, polygon, semicircle, ring, etc. in cross section.

[0048] The support member 15 can also be fixedly arranged in the positioning groove 16, or can be rotatably or rollingly arranged in the positioning groove 16. That is to say, the support member 15 can be rotated relative to the movable knife 2 or the stationary knife 1 to a position between the two.

[0049] Further, as attached Figures 10 to 14As shown, the support and limit member 10 includes a shaft 17 and a sleeve 18 rotatably mounted on the shaft 17. At this time, a point or line contact is formed between the sleeve 18 and the movable knife 2 or the stationary knife 1. The sleeve 18 is provided with positioning structures 19 at both ends perpendicular to the moving direction of the movable knife 2. The positioning structures 19 prevent the movable knife 2 and the stationary knife 1 from making relative movements perpendicular to the moving direction of the movable knife 2. The movable knife wall 12 extends into the groove defined by the positioning structure 19, and it is preferable that the two movable knife walls 12 just contact with the positioning structure 19. The positioning structure 19 can be two annular walls spaced apart along the axial direction of the sleeve 18. Of course, the positioning structure 19 can also be an annular groove spaced apart along the axial direction of the sleeve 18. Similarly, the movable knife wall 12 extends into the annular groove for lower limiting. In addition, the positioning structure 19 can also be other structures arranged on the movable knife 2 or the stationary knife 1. The positioning structure 19 only needs to prevent the movable knife 2 or the stationary knife 1 from making relative movements in the direction perpendicular to the moving direction of the movable knife 2. For example, the positioning structure 19 is protruded on the inner side of each stationary knife wall 11, and two relative positioning structures 19 limit the swing of the movable knife 2 in the direction perpendicular to the moving direction of the movable knife. The movable knife 2 runs more smoothly and effectively avoids the knife jumping phenomenon. Of course, the positioning structure can also be protruded on the surface of the movable knife wall 12 facing the two stationary knife walls 11. The positioning structure 19 only needs to partially protrude relative to the stationary knife wall 11 or the movable knife wall 12. The shape of the positioning structure 19 is not limited, and it can be a local protrusion, a convex strip, or a flexible convex foot. The flexible convex foot means that the positioning structure 19 has the elasticity to press the movable knife 2 in the direction perpendicular to the moving direction of the movable knife 2.

[0050] The stationary knife 1 is provided with a mounting hole 20 , and both ends of the shaft 17 extend into the mounting hole 20 . The positioning structure 19 is at least one positioning ring 21 or positioning ring groove 22 arranged on the outer periphery of the sleeve 18 . One end of the movable knife 2 is limited by the positioning ring 21 or the positioning ring groove 22 .

[0051] The mounting portion 23 is a structure protruding relative to the stationary knife wall 11 , and the support limiter 10 is located between the mounting portion 23 and the movable knife 2 so that the movable knife shearing portion 9 is always close to the stationary knife shearing portion 3 .

[0052] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A cutting assembly of a hair trimming device, characterized in that: include: The stationary knife (1) has a stationary knife shearing portion (3), wherein the stationary knife shearing portion (3) is formed with stationary knife teeth (4); A movable knife (2) is capable of relative movement with the stationary knife (1), the movable knife (2) having at least two movable blades (5), the movable blades (5) being connected as a whole, a movable blade tooth portion (7) being provided at the same end of the movable blades (5), the movable blade tooth portion (7) being formed with movable blade teeth (8), and the movable blade tooth portions (7) together forming a movable blade shearing portion (9) cooperating with the stationary knife shearing portion (3); The support and limit member (10) is installed on the stationary knife (1) or the movable knife (2) and can limit the gap between the stationary knife shearing part (3) and the movable knife shearing part (9) in a direction perpendicular to the moving direction of the movable knife (2), and the support and limit member (10) and the movable knife (2) or the stationary knife (1) are in point contact or line contact; wherein: The support and limiting member (10) is a spring sheet (13), and the spring sheet (13) has at least one elastic support portion (14) that forms a point contact limit or a line contact limit with the stationary knife (1) or the movable knife (2), and the elastic support portion (14) has a pre-compression elastic force perpendicular to the moving direction of the movable knife (2), and the elastic support portion (14) limits the movable knife (2) in the moving direction perpendicular to the moving direction of the movable knife (2), thereby limiting the distance between the movable knife shearing portion (9) and the stationary knife shearing portion (3).

2. The cutting assembly of the hair trimming device according to claim 1, characterized in that: The gap between the stationary knife shearing part (3) and the movable knife shearing part (9) in the direction perpendicular to the moving direction of the movable knife (2) is ≤0.05 mm.

3. The cutting assembly of the hair trimming device according to claim 1, characterized in that: The stationary knife (1) comprises two stationary knife walls (11) arranged relatively parallel to each other, and the stationary knife shearing portion (3) is connected between the two stationary knife walls (11); each movable knife blade (5) comprises a movable knife wall (12), and the movable knife tooth portion (7) is formed at one end of the movable knife wall (12) corresponding to the stationary knife shearing portion (3), and the movable knife wall (12) is parallel to the stationary knife wall (11).

4. The cutting assembly of the hair trimming device according to claim 1, characterized in that: Two movable blades (5) are provided, a connecting piece (6) is provided between the two movable blades (5), and the connecting piece (6) is an injection-molded connecting piece. The stationary blade shearing portion (3) is perpendicular to the stationary blade wall (11), and the movable blade wall (12) is perpendicular to the plane where the movable blade shearing portion (9) is located.

5. The cutting assembly of the hair trimming device according to claim 1, characterized in that: The stationary knife (1) has a mounting portion (23) for mounting the supporting and limiting member (10), and the movable knife (2) is located on the supporting and limiting member (10).

6. The cutting assembly of the hair trimming device according to claim 5, characterized in that: The mounting portion (23) is a hole or a groove formed on the stationary knife (1), and the support and limiting member (10) is connected to the stationary knife (1) via the hole or the groove.

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