A movable knife and cutter head assembly

Abstract

This invention relates to a moving blade and blade head assembly, characterized in that the substrate includes a cutting section and a supporting section. Viewed from the thickness direction of the substrate, a front cutting edge and a rear cutting edge are formed on both sides of the upper edge of the cutting section, respectively. Viewed from the width direction of the substrate, the upper end of the cutting section contacts the inner wall of the stationary blade mesh, and the front cutting edge of the cutting section adheres to the inner wall of the stationary blade mesh during rotating cutting. The beneficial effect of this invention is that by having the front cutting edge of the cutting section adhere to the inner wall of the stationary blade mesh, the traditional surface contact between the moving blade and the inner wall of the stationary blade mesh is changed to a line contact. This not only ensures the stability of the shaver's operation but also reduces the friction between the moving blade and the stationary blade mesh, preventing excessive temperature rise and overheating of both the moving blade and the stationary blade mesh, thus improving the comfort of using the shaver. Furthermore, the reduced frictional resistance between the moving blade and the stationary blade mesh also lowers the shaver's starting voltage and operating current, increasing battery life and extending its overall lifespan.

Description

Technical Field

[0001] This invention relates to a shaving head, and more specifically to a rotary shaving blade, primarily used in rotary shavers. Background Technology

[0002] Rotary shavers are primarily used for shaving beards and body hair, as well as for removing lint from textile fabrics. The main difference between shavers for shaving beards and body hair and those for removing lint lies in the size of the entry hole; other structural features are similar. Rotary shavers are popular due to their low noise and minimal vibration. A rotary shaver mainly consists of a housing and a rotary motor installed within the housing. The shaver head assembly is mounted on the upper part of the housing and is linked to the drive mechanism. Hair trimming or lint removal relies on the interaction of the moving and stationary blades on the shaver head assembly. Hair enters the stationary blade through the entry hole, and the moving blade, driven by the drive mechanism, rotates along the inner wall of the stationary blade, thus trimming the hair or removing lint.

[0003] In existing shaver head assemblies, the moving blade contacts the stationary blade by having its end face adhere to the inner wall of the stationary blade. While this method allows for hair trimming, the large contact area between the moving blade and the stationary blade during trimming increases frictional resistance. This not only causes the moving and stationary blades to heat up too quickly, increasing their temperature and reducing user comfort, but also increases the operating current of the shaver head assembly, shortening the battery life. Furthermore, to ensure the stability of the moving blade and prevent bending or deformation during rotary cutting, its thickness is generally above 0.2mm, which relatively increases production costs. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a moving blade and a blade head assembly. This moving blade not only changes the surface contact between the moving blade and the stationary blade to a line contact, reducing the contact area, lowering the temperature rise of both the stationary and moving blades, and improving the user comfort of the blade head assembly, but also improves the working strength of the moving blade and reduces its material cost by bending the moving blade.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is a moving blade, including a substrate; the substrate includes a cutting part and a supporting part. From the thickness direction of the substrate, a front cutting edge and a rear cutting edge are formed on both sides of the upper edge of the cutting part, respectively; from the width direction of the substrate, the upper end of the cutting part is in contact with the inner wall of the stationary blade mesh, and the front cutting edge of the cutting part is in contact with the inner wall of the stationary blade mesh when the substrate is rotated for cutting.

[0006] Ventilation holes are provided in the cutting section and the support section near the cutting section, penetrating the cutting section and the support section;

[0007] The substrate also includes an elastic support piece, one end of which is integrally connected to the support portion, and the other end is inclined and supports the substrate when it is rotated and cut.

[0008] Two square holes are arranged side by side on the support part. Two elastic support pieces are provided, and the upper end of each elastic support piece is connected to the inner wall of the upper end of the square hole as a whole. The lower end protrudes out of the side wall of the support part in an inclined shape and can support the substrate when the substrate is rotated and cut.

[0009] Preferably, when viewed from the width direction of the substrate, the upper end of the cut portion is arc-shaped and matches the arc shape of the stationary blade mesh.

[0010] Preferably, when viewed from the thickness direction of the substrate, the cutting portion is inclined towards the front blade side, so that an angle is formed between the cutting portion and the support portion.

[0011] Preferably, the included angle ∠a between the cutting part and the supporting part is between 10° and 30°.

[0012] Preferably, an inclined surface is provided between the front and rear cutting edges of the cutting section so that the horizontal height of the front cutting edge is higher than that of the rear cutting edge, and the inclination angle ∠b of the inclined surface is less than 15°.

[0013] Preferably, the thickness of the cutting portion and the supporting portion is ≤0.2mm.

[0014] Preferably, the ventilation holes are provided in a plurality of shapes, and their shapes are circular, square or polygonal.

[0015] A cutting head assembly includes the aforementioned moving blade.

[0016] The beneficial effects of this invention are that by ensuring the front blade of the cutting section fits snugly against the inner wall of the stationary foil, the traditional surface contact between the moving blade and the inner wall of the stationary foil is changed to a line contact. This not only maintains the hair-trimming performance of the moving blade and ensures the working stability of the rotary shaver, but also effectively reduces the friction between the moving blade and the stationary foil, preventing excessively rapid temperature rise and overheating of both the moving blade and the stationary foil, thus improving the user comfort of the shaver. Furthermore, the reduced frictional resistance between the moving blade and the stationary foil also lowers the starting voltage and operating voltage of the shaver, increasing battery life and extending battery lifespan. Attached Figure Description

[0017] Figure 1 Schematic diagram of existing rotating cutting with moving and stationary blades.

[0018] Figure 2 This is a schematic diagram of a rotating cutting process involving a moving blade and a stationary blade mesh, as described in an embodiment of the present invention.

[0019] Figure 3This is a front view of a moving blade according to an embodiment of the present invention.

[0020] Figure 4 This is a side view of a moving blade according to an embodiment of the present invention.

[0021] Figure 5 This is a three-dimensional structural diagram of a moving blade according to an embodiment of the present invention.

[0022] Figure 6 This is a three-dimensional assembly drawing of the moving blade and the moving blade holder in an embodiment of the present invention.

[0023] Figure 7 This is a cross-sectional view of a cutter head assembly according to an embodiment of the present invention.

[0024] Figure 8 This is a three-dimensional structural diagram of a cutter head assembly according to an embodiment of the present invention. Detailed Implementation

[0025] The embodiments of the present invention will be further described below with reference to the accompanying drawings:

[0026] like Figures 2-5As shown, the technical solution adopted in this invention is a moving blade. The moving blade 1 is the main component of a rotary shaver, rotary hair trimmer, or rotary lint remover, used to cut the beard hairs that extend into the stationary blade mesh 2, thus achieving beard trimming. Because the existing moving blade 1 contacts the inner wall of the stationary blade mesh 2 only at its upper end face, although this ensures the hair trimming performance of the moving blade 1, the contact area between the moving blade 1 and the inner wall of the stationary blade mesh 2 is relatively large. This increases the friction between the moving blade 1 and the inner wall of the stationary blade mesh 2 during high-speed rotation cutting, leading to excessively rapid temperature rise in both the moving blade 1 and the stationary blade mesh 2. In severe cases, this can burn the skin and reduce the comfort of using the shaver. Therefore, in order to solve the above-mentioned technical defects, the moving blade 1 includes a substrate 11, which includes a cutting part 111 and a supporting part 112. From the thickness direction of the substrate 11, a front cutting edge 113 and a rear cutting edge 114 are formed on both sides of the upper edge of the cutting part 111. From the width direction of the substrate 11, the upper end of the cutting part 111 is in contact with the inner wall of the stationary blade mesh 2, and the front cutting edge 113 of the cutting part 111 is in contact with the inner wall of the stationary blade mesh 2 when the substrate 11 rotates for cutting. During assembly, the moving blade 1 is inserted into the mounting groove 41 of the moving blade holder 4. The width of the mounting groove 41 is wider than the thickness of the moving blade 1. When the moving blade holder 4 rotates with the drive mechanism, under the frictional resistance between the front blade 113 of the cutting part 111 of the substrate 11 and the inner wall of the stationary blade mesh 2, the substrate 11 will tilt in the opposite direction of rotation, so that the front blade 113 of the cutting part 111 contacts the inner wall of the stationary blade mesh 2 and rotates along the inner wall of the stationary blade mesh 2. When the beard enters the stationary blade mesh 2 through the guide hole of the stationary blade mesh 2, it will be cut by the front blade 113 of the cutting part 111 and the guide hole of the stationary blade mesh 2, thus achieving beard trimming. By having the front blade 113 of the cutting section 111 adhere to the inner wall of the stationary foil 2, the traditional surface contact between the moving blade 1 and the inner wall of the stationary foil 2 is changed to a line contact. This not only maintains the hair trimming performance of the moving blade 1 and ensures the working stability of the rotary shaver, but also effectively reduces the friction between the moving blade 1 and the stationary foil 2, preventing excessive temperature rise and overheating of both blades, thus improving the user comfort of the shaver. Furthermore, the reduced frictional resistance between the moving blade 1 and the stationary foil 2 also lowers the shaver's starting and operating voltage, increasing battery life and overall battery life.

[0027] To improve comfort during beard trimming, the stationary foil 2 of a rotary shaver is designed with a centrally convex arc shape. This arc enhances the feel against the skin. Therefore, to ensure proper fit between the moving blade 1 and the stationary foil 2, the upper end of the cutting section 111 is arc-shaped when viewed from the width of the base 11, matching the arc shape of the stationary foil 2. Of course, some rotary shavers use a flat stationary foil 2. If the stationary foil 2 is flat, the upper end of the cutting section 111 can also be straight; the specific design depends on the cross-sectional shape of the stationary foil 2.

[0028] To reduce the material cost of the moving blade 1, the existing moving blades 1 are all thicker than 0.2mm to increase their bending strength. While increasing the material thickness improves the working strength of the moving blade 1, it also increases its production cost. To ensure the working strength of the moving blade 1 while reducing its production cost, the cutting section 111 is tilted towards the front blade 113 when viewed from the thickness direction of the substrate 11, creating an angle between the cutting section 111 and the support section 112. When the substrate 11 rotates, the front blade 113 of the cutting section 111 fits against the arc-shaped inner wall of the stationary blade mesh 2, cutting the whiskers that have entered the whisker inlet of the stationary blade mesh 2. This not only ensures the hair trimming performance of the moving blade 1, but also increases its bending strength by utilizing the bent cutting section 111. While ensuring the working strength of the substrate 11, the material thickness of the substrate 11 can be reduced, lowering the production cost of the moving blade 1 and maintaining its working performance.

[0029] To maximize the balance between the hair trimming performance and workload of the moving blade 1, the included angle ∠a between the cutting part 111 and the support part 112 is between 10° and 30°, preferably 24°. If the bending angle of the cutting part 111 is too small, such as less than 10°, the bending resistance of the substrate 11 will be relatively poor. When the substrate 11 rotates and cuts, the cutting part 111 is prone to bending deformation, affecting the hair trimming performance of the moving blade 1. On the other hand, if the bending angle of the cutting part 111 is too large, such as greater than 30°, although the bending strength of the substrate 11 is improved, the tilt angle of the cutting part 111 will also be relatively large. This will not only increase the distance between the substrate 11 and the inner wall of the stationary blade mesh 2, requiring the height of the substrate 11 to be increased, thus increasing the material cost of the moving blade 1, but also reduce the hair trimming performance of the cutting part 111. Therefore, the implementation method of this embodiment is the preferred embodiment.

[0030] To prevent the contact area between the moving blade 1 and the inner wall of the stationary blade mesh 2 from being too large, which would increase the friction between the moving blade 1 and the stationary blade mesh 2 and cause technical problems such as excessively rapid temperature rise, excessively high temperature, and increased starting voltage and operating current, an inclined surface 115 is provided between the front blade 113 and the rear blade 114 of the cutting part 111, so that the horizontal height of the front blade 113 is higher than that of the rear blade 114. The inclination angle ∠b of the inclined surface 115 is less than 15°, preferably 5°. The front blade 113 and rear blade 114 on both sides of the upper end of the cutting section 111 are set to different heights to form an inclined surface 115. Since the front blade 113 is in contact with the inner wall of the stationary blade mesh 2 and is higher than the rear blade 114, when the substrate 11 rotates to cut, it not only ensures that the moving blade 1 and the inner wall of the stationary blade mesh 2 maintain line contact, reducing the contact area between the moving blade 1 and the stationary blade mesh 2, but also controls the temperature rise of the stationary blade mesh 2 and the moving blade 1 to the greatest extent, reducing the temperature, improving the user comfort of the stationary blade mesh 2, and reducing the starting voltage and operating current. At the same time, the tilt angle can also be used to improve the sharpness of the front blade 113 of the cutting section 111 and improve the hair trimming efficiency of the moving blade 1. Of course, the inclination angle ∠b of the inclined surface 115 between the front cutting edge 113 and the rear cutting edge 114 of the cutting part 111 can also be set to 15°, 45° or 60°, etc. However, setting too large an inclination angle will make the front cutting edge 113 of the cutting part 111 too sharp, and the front cutting edge 113 is prone to chipping during use, damaging the moving blade 1. Therefore, the implementation of this embodiment is the preferred implementation.

[0031] To ensure the working strength of the moving blade 1 and prevent it from bending and deforming during rotary cutting, which would affect the trimming and cleaning of beards, hair, or fuzz, the existing moving blade 1 is relatively thick, which correspondingly increases the production cost of the moving blade 1. To reduce the production cost of the moving blade 1, the thickness of the cutting part 111 and the supporting part 112 is ≤0.2mm. Based on the bent cutting part 111, the thickness of the cutting part 111 and the supporting part 112 of the substrate 11 is reduced, preferably to 0.1mm. This not only saves material costs for the moving blade 1, but also ensures the working strength of the moving blade 1, prevents the substrate 11 from bending and deforming during rotary cutting, and ensures the hair trimming performance of the moving blade 1.

[0032] When the moving blade 1 rotates along the inner wall of the stationary blade mesh 2 under the drive of the moving blade holder 4, the cut hairs, stubble, or hair balls are temporarily stored inside the stationary blade mesh 2. The stationary blade mesh 2 is a relatively enclosed space. When the moving blade 1 rotates, it creates an air vortex inside the stationary blade mesh 2. The cut hair fragments are scattered disorderly under the influence of the air vortex, and may even fly out through the guide holes of the stationary blade mesh 2. This can cause hair fragments to adhere to or get into the skin or mouth / nose cavity during use. To solve the technical problem of the air vortex generated by the rotation of the moving blade 1, a vent 116 is provided near the cutting part 111 and the support part 112, penetrating the cutting part 111 and the support part 112. By providing a vent 116 on the cutting portion 111 on the base plate 11 of the moving blade 1 and at the connection between the cutting portion 111 and the support portion 112, air can pass through the vent 116 when the base plate 11 rotates and cuts. The cutting portion 111 and the support portion 112 of the base plate 11 reduce the compression of air, which can significantly weaken the cyclone phenomenon in the stationary blade net 2, reduce the intensity of the cyclone, effectively prevent hair fragments from flying out of the stationary blade net 2, and improve the hygiene and comfort of using the shaver.

[0033] To minimize the intensity of the air vortex within the stationary blade mesh 2 during rotary cutting, several vent holes 116 are provided, and their shapes are circular, square, or polygonal. While ensuring the working strength of the cutting section 111 and the support section 112 of the substrate 11, several vent holes 116 can be simultaneously provided on both the cutting section 111 and the support section 112. The vent holes 116 can be circular, square, or polygonal in shape. During use, the numerous vent holes 116 greatly increase the air permeability area of ​​the substrate 11, minimizing the compression of air by the substrate 11, thereby reducing the intensity of the air vortex within the stationary blade mesh 2, preventing hair clippings from splashing out of the stationary blade mesh 2, and improving the hygiene and comfort of using the shaver.

[0034] Since the moving blade 1 is inserted into the mounting groove 41 of the moving blade holder 4 during assembly, and the width of the mounting groove 41 is wider than the thickness of the moving blade 1, when the moving blade holder 4 rotates with the drive mechanism, the substrate 11 will tilt in the opposite direction of rotation due to the frictional resistance between the front blade 113 of the cutting part 111 of the substrate 11 and the inner wall of the stationary blade mesh 2. To improve the working strength of the substrate 11 when tilted and prevent the support part 112 of the substrate 11 from bending and deforming, the substrate 11 also includes an elastic support piece 117. One end of the elastic support piece 117 is connected to the support part 112 as a whole, and the other end is tilted to support the substrate 11 when it rotates and cuts. By providing an elastic support piece 117 on one side of the support part 112, the elastic support piece 117 provides support force when the substrate 11 is tilted and cuts, effectively preventing the support piece from bending or deforming when the substrate 11 is rotated and cuts, thereby improving the bending strength of the substrate 11 and the hair trimming performance of the moving blade 1. In addition, it ensures that during the cutting process, only the front blade 113 of the cutting part 111 contacts the inner wall of the stationary blade screen 2 and maintains line contact, effectively controlling the temperature rise of the moving blade 1 and the stationary blade screen 2, reducing the surface temperature of the stationary blade screen, improving the user comfort of the stationary blade screen, and reducing the starting voltage and operating current of the moving blade 1, thus extending the battery life and service life of the shaver.

[0035] To facilitate the production and processing of the elastic support piece 117, two square holes 118 are arranged side by side on the support portion 112. Two elastic support pieces 117 are provided, with the upper end of each piece 117 integrally connected to the upper inner wall of the square hole 118. The lower end protrudes obliquely from the side wall of the support portion 112 and supports the substrate 11 during rotational cutting. By providing two square holes 118 on the support portion 112 and connecting one end of the elastic support piece 117 integrally to the upper inner wall of the square hole 118, it can be integrally formed through a stamping process during production, improving the production efficiency of the elastic support piece 117 and increasing the working strength of the substrate 11.

[0036] like Figures 6-8 As shown, a cutter head assembly includes the aforementioned moving cutter 1, stationary cutter mesh 2, stationary cutter seat 3, moving cutter seat 4, and floating spring sheet 5. The stationary cutter mesh 2 is installed at one end of the stationary cutter seat 3 via a fixing ring 6. The moving cutter seat 4 is provided with multiple grooves perpendicular to the moving cutter seat 4. Each groove 41 has a limiting platform 42 on one side. The number of moving cutters 1 is the same as the number of grooves 41, and they are inserted into the grooves 41 and connected to the floating spring sheet 5 fixed to the bottom of the moving cutter seat 4. The elastic support sheet 117 is placed on the limiting platform 42 to support the moving cutter 1.

[0037] The above embodiments should not be considered as limitations on the present invention, but any improvements made based on the spirit of the present invention should be within the protection scope of the present invention.

Claims

1. A moving blade, comprising a substrate (11); characterized in that... The substrate (11) includes a cutting part (111) and a support part (112). From the thickness direction of the substrate (11), a front cutting edge (113) and a rear cutting edge (114) are formed on both sides of the upper edge of the cutting part (111). From the width direction of the substrate (11), the upper end of the cutting part (111) is in contact with the inner wall of the stationary knife net (2), and the front cutting edge (113) of the cutting part (111) is in contact with the inner wall of the stationary knife net (2) when the substrate (11) is rotated for cutting. Ventilation holes (116) are provided in the cutting part (111) and the support part (112) near the cutting part (111). The substrate (11) further includes an elastic support (117), one end of which is connected to the support (112) as a whole, and the other end is inclined and supports the substrate (11) when the substrate (11) is rotated and cut; Two square holes (118) are arranged side by side on the support part (112). Two elastic support pieces (117) are provided, and the upper end of each elastic support piece (117) is connected to the inner wall of the upper end of the square hole (118) as a whole. The lower end protrudes out of the side wall of the support part (112) in an inclined manner and can support the substrate (11) when the substrate (11) is rotated and cut.

2. A moving blade according to claim 1, characterized in that... Viewed from the width direction of the substrate (11), the upper end of the cutting part (111) is arc-shaped and matches the arc shape of the stationary knife mesh (2).

3. A moving blade according to claim 1, characterized in that... Viewed from the thickness direction of the substrate (11), the cutting part (111) is inclined toward the front blade (113), so that the cutting part (111) and the support part (112) form an angle.

4. A moving blade according to claim 3, characterized in that... The included angle ∠a between the cutting part (111) and the supporting part (112) is between 10° and 30°.

5. A moving blade according to claim 1, characterized in that... The cutting part (111) has an inclined surface (115) between the front cutting edge (113) and the rear cutting edge (114) so ​​that the horizontal height of the front cutting edge (113) is higher than that of the rear cutting edge (114), and the inclination angle ∠b of the inclined surface (115) is less than 15°.

6. A moving blade according to claim 1, characterized in that... The thickness of the cutting part (111) and the supporting part (112) is ≤0.2mm.

7. A moving blade according to claim 1, characterized in that... The ventilation holes (116) are provided in several forms, and their shapes are circular, square or polygonal.

8. A blade assembly, characterized in that... It includes a moving knife (1) as described in any one of claims 1 to 7.

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