Inner cutter structure of electric shaver and machining method of inner cutter structure

Abstract

The invention provides an inner knife structure of an electric shaver and a processing method of the inner knife structure, the inner knife structure comprises an inner knife holder, the inner knife holder comprises a plastic knife holder body and a metal shaping piece with a thickness, the metal shaping piece is arranged in the plastic knife holder body through integral injection molding, and the metal shaping piece extends in the plastic knife holder body along the length direction of the plastic knife holder body; the inner knife comprises at least one inner blade unit fixedly mounted in the plastic knife holder body, and the inner blade units are fixedly mounted in the plastic knife holder body and above the metal shaping piece in the length direction at intervals; an inner cutting edge matched with the outer cutter is arranged at the top of the inner blade unit. The strength of the inner tool apron is enhanced through the built-in metal shaping piece, and the metal shaping piece corresponds to the inner tool apron body in length and is integrally formed in the inner tool apron body in an injection molding mode, so that deformation of the inner tool apron is effectively prevented, the service life of the inner tool apron and the service life of a whole machine are guaranteed, and the rib width of the inner tool of the structure can be as low as 0.1 mm. And the sharpness, the cutting efficiency and the beard feeding amount of the inner cutter are greatly improved.

Description

Technical Field

[0001] The present invention relates to a cutter head of an electric shaver, in particular to an inner cutter structure of a reciprocating electric shaver. Background Art

[0002] Personal care products, such as shaving devices, include a cutter head and a handle. The cutting operation is achieved by the relative movement of the inner and outer cutters in the cutter head. The inner and outer cutters are respectively installed on their own cutter holders. Generally, the inner cutter holder for installing the inner cutter is installed in the accommodation groove of the outer cutter holder. For an electric shaver, the relative movement of the inner and outer cutters is mainly achieved by the inner cutter as a moving part. Specifically, it is achieved by driving a driving part to drive the inner cutter seat installed with the inner cutter to move. And the inner cutter seat is made of plastic material due to noise reduction and heat dissipation factors. Generally, the inner cutter structure is divided into an insert type and a frame etched cutter. Due to the structural relationship, the inner cutter seat of the insert type inner cutter is prone to thermal expansion and contraction deformation during long-term high-speed movement, especially the reciprocating inner cutter seat is prone to deformation in the length direction, affecting the cooperation between the inner and outer cutters. For the frame etched cutter, due to the limitation of the slit cutter blade structure, it needs to have a wide rib with a width of at least 0.4 mm to achieve the due whisker feeding and cutting efficiency. Summary of the Invention

[0003] The present invention provides an inner cutter structure of an electric shaver with a reciprocating cutter head that is simple in structure, firm in connection, and efficient.

[0004] To solve the above technical problems, the present invention adopts the following technical solutions: An inner cutter structure of an electric shaver, comprising: an inner cutter seat, which includes a plastic cutter seat body and a metal shaping member with a thickness built in the plastic cutter seat body by integral injection molding. The metal shaping member extends along the length direction of the plastic cutter seat body in the plastic cutter seat body;

[0005] An inner cutter, including at least one inner cutter blade unit fixedly installed in the plastic cutter seat body. The inner cutter blade units are fixedly installed at intervals along the length direction above the metal shaping member in the plastic cutter seat body; the top of the inner cutter blade unit is provided with an inner cutter edge for cooperating with the outer cutter.

[0006] As an improvement: The plastic cutter seat body is integrally formed to include a lower base extending in the length direction and a partition rib unit arranged with vertical gaps on the lower base. A horizontal gap for laying the metal shaping member is provided between the lower base and the lower bottom surface of the partition rib unit. The inner cutter blade unit extends out of the plastic cutter seat body through the vertical gap to cooperate with the lower surface of the outer cutter.

[0007] As an improvement: The partition rib unit includes a first partition rib unit for fixing the inner blade unit and a second partition rib unit disposed between two adjacent inner blade units. The metal shaping member is provided with a second through hole at a position corresponding to the second partition rib, and the lower base is provided with a second connecting column passing through the second through hole and integrally connected to the lower bottom surface of the second partition rib unit.

[0008] As an improvement: The inner blade unit includes a sheet-like blade body erected vertically. The inner blade edge is located at the top of the sheet-like blade body. A through hole is formed in the middle of the sheet-like blade body. The sheet-like blade body is clamped in a vertical gap and is integrally injection molded to form positioning columns passing through the through hole and connecting the partition rib units on both sides of the sheet-like blade body.

[0009] As an improvement: The inner blade unit includes at least two sheet-like blade bodies erected with a spacing therebetween and a connecting piece connected between the bottom edges of the sheet-like blade bodies.

[0010] As an improvement: One or several positioning holes are formed in the connecting piece. The metal shaping member is provided with a first through hole at a position corresponding to the positioning holes of the connecting piece. The lower base is provided with a first connecting column passing through the first through hole and the positioning holes and integrally connected to the lower bottom surface of the partition rib unit.

[0011] As an improvement: The cross section of the metal shaping member covering the lower base is in an inverted U shape, that is, the metal shaping member includes a base laid on the lower base and pressing edges bent downward from both long sides of the base and pressing on the long side surfaces of the lower base.

[0012] The beneficial effects provided by the present invention are as follows: The strength of the inner knife holder is enhanced by the built-in metal shaping member. Since the metal shaping member corresponds to the inner knife holder body in length and is integrally injection molded and built-in, the metal shaping member is an inner sandwich of the inner knife holder itself, effectively preventing the deformation of the inner knife holder, and ensuring the service life of the inner knife holder and the whole machine. Moreover, the plastic knife holder body, the metal shaping member, and the inner knife are integrally injection molded and fixed, ensuring the precise positioning of the inner knife on the inner knife holder. And for the inner knife with this structure, the rib width can be as low as 0.1 mm, and the sharpness, cutting efficiency, and whisker intake amount of the inner knife are all greatly improved. At the same time, this structure has a firm, precise connection, no other fasteners, and few processing steps.

[0013] The present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0014] Figure 1 is the overall structural schematic diagram of the inner knife structure of the electric shaver provided by the present invention.

[0015] Figure 2 is Figure 1 the exploded structural schematic diagram of

[0016] Figure 3 isFigure 1 Rear view.

[0017] Figure 4 is Figure 3 Cross-sectional view taken along line K-K of the second partition rib unit in

[0018] Figure 5 is Figure 3 Cross-sectional view taken along line L-L of the first partition rib unit in Detailed implementation mode

[0019] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 shown, an embodiment of the inner blade structure of the electric shaver of the present invention includes:

[0020] Inner blade holder, which includes a plastic blade holder body 1 and a thick metal shaping member 2 integrally injection-molded and placed inside the plastic blade holder body 1. The metal shaping member 2 extends along the length direction of the plastic blade holder body 1 inside the plastic blade holder body 1;

[0021] Inner blade, including at least one inner blade unit 3 fixedly installed inside the plastic blade holder body 1. The inner blade units 3 are fixedly installed at intervals along the length direction above the metal shaping member 2 inside the plastic blade holder body 1; The top of the inner blade unit 3 is provided with an inner blade edge 31 for cooperating with the outer blade, and the inner blade edge 31 at the top of the inner blade unit is exposed outside the inner blade holder.

[0022] The described plastic knife seat body 1 is integrally formed and includes a lower base 11 extending in the length direction, and partition rib units 12 arranged and distributed on the lower base 11 with vertical gaps 13. There is a horizontal gap 14 for laying the metal shaping piece 2 between the lower base 11 and the lower bottom surface of the partition rib units 12. The inner blade unit extends out of the plastic knife seat body 1 through the vertical gap and cooperates with the lower surface of the outer knife. The overall structure of the inner knife seat of this structure is compact. The plastic knife seat body 1, the metal shaping piece 2, and the inner knife are tightly fitted and integrally connected firmly. The partition rib units can not only ensure the stable positioning of the inner blade unit in the plastic knife seat body 1, but also provide lateral support for the inner blade unit during cutting operations, effectively preventing the deformation and displacement of the inner blade unit during operations, and providing accurate and reliable guarantee for the cooperation between the inner and outer knives. The inner knife of this embodiment is an upright knife, which is an improvement of the insert type, that is, the inner blade unit 3 includes a vertically arranged sheet-like knife body 32. The inner blade unit includes at least two sheet-like knife bodies 32 standing with a spacing, and a connecting piece 33 connected between the bottom edges of the sheet-like knife bodies 32. This embodiment is a structure with two knife bodies in one unit. Of course, it can also be a single-piece L shape or a multi-piece spaced connection type, which can be set according to needs. The inner cutting edge is located at the top of the sheet-like knife body. A through hole 32a is opened in the middle of each sheet-like knife body. The sheet-like knife body 32 is clamped in the vertical gap 13. The width of the vertical gap 13 corresponds to the thickness of the sheet-like knife body 32, and positioning columns 15 passing through the through hole 32a and connecting the partition rib units 12 on both sides of the sheet-like knife body 32 are formed by integral injection molding. The positioning columns 15 can limit the height of the sheet-like knife body 32 and even the whole inner blade unit. The connecting piece 33 of this embodiment is designed without holes. A number of first through holes 22 are opened on the metal shaping piece 2. The lower base 11 is provided with first connecting columns 16 passing through the first through holes 22 and abutting against the lower bottom surface of the connecting piece. The first connecting columns 16 can not only support the inner blade unit, especially when cooperating with the outer knife for cutting movement. In this embodiment, the partition rib units are positioned to support the inner blade unit in an inner and outer wrapping manner. The inner blade unit is stably positioned in all directions. The partition rib units 12 are lower in height than the inner blade unit on the lower base, so that the inner cutting edge 31 of the sheet-like knife body 32 can be completely exposed, and a whisker feeding and whisker dropping space groove is formed between two adjacent inner cutting edges 31. The height of the partition rib units 12 can be determined by comprehensively considering the longitudinal width in combination with the whisker feeding and whisker dropping amounts. Of course, two longitudinally spaced positioning holes are also opened on the connecting piece 33. The metal shaping piece 2 is provided with first through holes 22 at positions corresponding to the positioning holes 33a of the connecting piece. The lower base 11 is provided with first connecting columns 16 passing through the first through holes 22 and the positioning holes 33a and integrally connected to the lower bottom surface of the partition rib units 12.The cooperation between the first connecting column 16 and the positioning hole 33a laterally limits the entire inner blade unit on the lower base 11, and the connecting piece 33 is at least partially clamped between the partition rib unit 12 and the metal shaping member 2. This solution has relatively high requirements for the gap between the lower bottom surface of the partition rib unit where the inner blade unit is located and the lower base 11, that is, it must correspond to the sum of the thicknesses of the metal shaping member 2 and the connecting piece 33. In this embodiment, a holeless design is adopted, and the first connecting column 16 directly abuts against the lower bottom of the connecting piece 33, which not only facilitates the consistency between the support and the inner blade unit but also simplifies the processing and injection molding.

[0023] The partition rib unit 12 of this embodiment includes a first partition rib unit 12a for fixing the inner blade unit 3 and a second partition rib unit 12b disposed between two adjacent inner blade units 3. The metal shaping member 2 is provided with a second through hole 21 at a position corresponding to the second partition rib 12b, and the lower base 11 is provided with a second connecting column 14 passing through the second through hole 21 and integrally connected to the lower bottom surface of the second partition rib unit 12b. Since a plurality of second partition rib units 12b are directly connected on the lower base, it provides overall support for the first partition rib 12a, effectively avoiding the potential problems of deformation or fracture in the middle of the partition rib unit or the plastic knife holder body 1 as a whole, further improving the stability and anti-deformation force on the basis of the metal shaping member 2, and at the same time, it can also achieve a good shock absorption and noise reduction effect.

[0024] In order to further avoid thermal expansion and contraction and improve the anti-deformation property of the inner knife seat in this embodiment, the cross-section of the metal shaping member 2 covering the lower base 11 is in an inverted U shape, that is, the metal shaping member 2 includes a base body 23 laid on the lower base 11 and pressing edges 24 bent downward from both long sides of the base body 23 to press on the long side surfaces of the lower base. The pressing edges 24 can effectively longitudinally shape the lower base and provide wrapping-shaped support for the lower base.

[0025] The processing method of the inner knife structure of the above electric shaver includes the following steps:

[0026] Inner knife processing: Processing to form at least one inner blade unit 3 with an inner blade edge 31 at the top;

[0027] Metal shaping member processing: Stretching and stamping according to the inner knife length to form a metal shaping member;

[0028] Positioning the components: Arranging and positioning the inner blade unit above the metal shaping member in the knife seat injection mold, waiting for injection molding;

[0029] Injection molding: The inner tool holder is formed by injection molding, so that the metal shaping part 2 with thickness and the inner blade unit are fixed in the plastic tool holder body 1, and the inner cutting edge 31 at the top of the inner blade unit is exposed outside the inner tool holder. A whisker inlet space is formed with a spacing between adjacent inner cutting edges 31. Since the plastic tool holder body, the metal shaping part, and the inner blade are integrally connected and fixed by one-time injection molding, it has higher stability, accuracy, and reliability in terms of connection and firmness compared with fastener connection. Moreover, it is convenient for processing, has fewer components, high strength, and low cost.

[0030] Although the present invention has been disclosed above with specific embodiments, it is not intended to limit the present invention. Any person skilled in the art can still make some modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention should be defined by the scope of the appended claims.

Claims

1. An inner blade structure of an electric shaver, characterized in that: include: An inner knife seat, comprising a plastic knife seat body (1) and a metal shaping piece (2) with thickness which is built into the plastic knife seat body (1) by integral injection molding, wherein the metal shaping piece (2) extends inside the plastic knife seat body (1) along the length direction of the plastic knife seat body (1); The inner knife comprises at least one inner blade unit (3) fixedly installed in a plastic knife seat body (1); the inner blade units (3) are fixedly installed in the plastic knife seat body (1) above the metal forming part (2) and arranged at intervals along the length direction; the top of the inner blade unit (3) is provided with an inner blade (31) that cooperates with the outer knife.

2. The inner blade structure of the electric shaver according to claim 1, characterized in that: The plastic knife seat body (1) is integrally formed and includes a lower base (11) extending in the length direction, and a rib unit (12) with a vertical gap (13) arranged and distributed on the lower base (11). A horizontal gap (14) for laying a metal forming part (2) is provided between the lower base (11) and the lower bottom surface of the rib unit (12). The inner blade unit extends out of the plastic knife seat body (1) through the vertical gap to cooperate with the lower surface of the outer blade.

3. The inner blade structure of the electric shaver according to claim 2, characterized in that: The rib unit (12) comprises a first rib unit (12a) for fixing the inner blade unit (3) and a second rib unit (12b) arranged between two adjacent inner blade units (3); the metal forming member (2) is provided with a second through hole (21) at a position corresponding to the second rib (12b); and the lower base (11) is provided with a second connecting column (14) passing through the second through hole (21) and integrally connected with the lower bottom surface of the second rib unit (12b).

4. The inner blade structure of the electric shaver according to claim 2 or 3, characterized in that: The inner blade unit (3) comprises a vertically erected blade body (32), the inner blade edge being located at the top of the blade body, a through hole (32a) being opened in the middle of the blade body, the blade body (32) being clamped in the vertical gap (13), and a positioning column (15) is formed by integral injection molding to pass through the through hole (32a) and connect the partition rib units (12) on both sides of the blade body (32).

5. The inner blade structure of the electric shaver according to claim 4, characterized in that: The inner blade unit comprises at least two plate-type blade bodies (32) standing upright with a spacing, and a connecting piece (33) connected between the bottom edges of the plate-type blade bodies (32).

6. The inner blade structure of the electric shaver according to claim 5, characterized in that: The connecting plate (33) is provided with one or more positioning holes, the metal forming part (2) is provided with a first through hole (22) at a position corresponding to the connecting plate positioning hole, and the lower base (11) is provided with a first connecting column (16) passing through the first through hole (22) and the positioning hole and integrally connected with the lower bottom surface of the rib unit (12).

7. The inner blade structure of the electric shaver according to claim 2 or 3, characterized in that: The cross section of the metal shaping piece (2) covering the lower base (11) is inverted U-shaped, that is, the metal shaping piece (2) includes a base (23) laid on the lower base (11) and a pressing edge (24) bent downward from the two long sides of the base (23) to form a pressing cover on the long side surface of the lower base.

8. The inner blade structure of the electric shaver according to claim 4, characterized in that: The cross section of the metal shaping piece (2) covering the lower base (11) is inverted U-shaped, that is, the metal shaping piece (2) includes a base (23) laid on the lower base (11) and a pressing edge (24) bent downward from the two long sides of the base (23) to form a pressing cover on the long side surface of the lower base.

9. The inner blade structure of the electric shaver according to claim 5, characterized in that: The cross section of the metal shaping piece (2) covering the lower base (11) is inverted U-shaped, that is, the metal shaping piece (2) includes a base (23) laid on the lower base (11) and a pressing edge (24) bent downward from the two long sides of the base (23) to form a pressing cover on the long side surface of the lower base.

10. The inner blade structure of the electric shaver according to claim 6, characterized in that: The cross section of the metal shaping piece (2) covering the lower base (11) is inverted U-shaped, that is, the metal shaping piece (2) includes a base (23) laid on the lower base (11) and a pressing edge (24) bent downward from the two long sides of the base (23) to form a pressing cover on the long side surface of the lower base.

11. A method for processing an inner blade structure of an electric shaver, characterized in that: The following steps are involved: Inner blade processing; processing to form at least one inner blade unit (3) with an inner blade edge (31) on the top; Metal forming parts processing: metal forming parts are formed by stretching and stamping according to the length of the inner knife; Positioning parts: Arrange and position the inner blade unit on the metal molding part in the knife seat injection mold for injection molding; Injection molding: The inner blade seat is formed by injection molding, so that the thick metal shaping piece (2) and the inner blade unit are fixed in the plastic blade seat body (1), and the inner blade (31) at the top of the inner blade unit is exposed from the inner blade seat, and a space is formed between two adjacent inner blades (31) to form a whisker entry space.

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