Rotating knife set and razor

Abstract

The present invention relates to a rotating knife group and a shaver, characterized in that a force-bearing end face is provided at the bottom of the moving knife, the force-bearing end face is inclined relative to the vertical line of the rotating axis of the moving knife seat, and the inclination direction of the force-bearing end face is toward the rotating axis of the moving knife seat. The beneficial effect of the present invention is that an inclined force-bearing end face facing the rotating axis of the moving knife seat is provided at the bottom of the moving knife, and when the extrusion force applied by the elastic sheet to the force-bearing end face of the moving knife causes the blade of the moving knife to contact the inner surface of the static knife mesh, the directions of the reaction force and the centripetal force generated by the inner surface of the static knife mesh can be close to or kept overlapping, and the extrusion force applied by the elastic sheet to the moving knife due to the decomposition of the arc surface of the static knife mesh is reduced as much as possible, and the holding force between the moving knife and the inner surface of the static knife mesh is ensured. While avoiding the occurrence of hair pulling, the friction resistance between the moving knife and the static knife mesh can be effectively reduced, the temperature rise and working noise of the moving knife and the static knife mesh are reduced, and the comfort of use of the rotating knife group is improved.

Description

Technical Field

[0001] The invention relates to a hair trimming knife set, and more particularly to a rotary knife set and a shaver, which are mainly used in the field of hair trimming. Background Art

[0002] like Figure 1-2 As shown, the existing rotary knife group includes a stationary knife mesh 1 and a moving knife 2. The stationary knife mesh 1 is fixed on the stationary knife seat 3, and the stationary knife seat 3 is threadedly connected to the body; the moving knife 2 is clamped in the moving knife seat 4. In order to protect the moving knife 2 and prevent the moving knife 2 from being damaged by force and the blade of the moving knife 2, an elastic sheet 5 is added at the bottom of the moving knife seat 4. The elastic sheet 5 is provided with a number of spring tongue sheets 51 and fixed sheets 52 equal to the number of the moving knife 2. The fixed sheet 52 is inserted into the fixed groove 21 provided at the bottom of the moving knife 2 to prevent the moving knife 2 from being separated from the moving knife seat 4. At the same time, the spring tongue sheet 51 supports the two sides of the bottom of the moving knife 2 so that the blade of the moving knife 2 is fitted with the inner surface of the stationary knife mesh 1, thereby ensuring the hair trimming efficiency and the moving knife 2 can be synchronously displaced downward after the stationary knife mesh 1 is subjected to force to prevent the stationary knife mesh 1 from being broken by the blade of the moving knife 2 and the blade of the moving knife 2 from breaking.

[0003] Although this structure can ensure the safety of the blade of the movable blade 2 during use, the elastic sheet 5 is in a vertical state with the rotating axis of the shaver body when fixed to the bottom of the movable blade seat 4, and is affected by the spherical surface of the static blade mesh 1. When the spring tongue sheet 51 on the elastic sheet 5 applies an extrusion force to the bottom of the movable blade 2 so that the blade of the movable blade 2 contacts the bottom surface of the static blade mesh 1, the inner surface of the static blade mesh 1 will correspondingly form a reaction force pointing to the spring tongue sheet 51 and a centripetal force pointing to the center of the static blade mesh 1, so that the holding force applied by the spring tongue sheet 51 to the movable blade 2 to fit the static blade mesh 1 is correspondingly weakened, and the trimming force of the movable blade 2 is also correspondingly reduced. When hair enters the static blade mesh 1, hair pulling will occur, affecting the trimming efficiency and trimming effect of the rotary blade assembly. In order to avoid the hair pulling phenomenon caused by the reduction of the holding force between the movable blade 2 and the static blade mesh 1, the elastic force of the spring tongue sheet 51 must be increased. Although increasing the elastic force of the spring tongue piece 51 can avoid hair pulling between the movable knife 2 and the stationary knife mesh 1, it will increase the friction between the blade of the movable knife 2 and the inner surface of the stationary knife mesh 1 during the rotating trimming process of the movable knife, resulting in an increase in the temperature rise between the movable knife 2 and the stationary knife mesh 1 and an increase in the working noise of the movable knife 2, thereby reducing the comfort of using the rotating knife group and the razor. Summary of the invention

[0004] In order to solve the above technical problems; the present invention provides a rotating knife group and a shaver, which can minimize the weakening of the holding force applied by the spring tongue piece to the moving knife, avoid the hair pulling phenomenon between the moving knife and the static knife mesh without increasing the squeezing force applied by the spring tongue piece to the moving knife, ensure the hair trimming efficiency of the rotating knife group, reduce the temperature rise and working noise of the rotating knife group, and improve the comfort of use of the rotating knife group and the shaver.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is a rotating knife group, including a stationary knife mesh and a moving knife, the moving knife is placed in a moving knife seat and is pressed and matched with an elastic sheet fixed on the moving knife seat; a force-bearing end face is provided at the bottom of the moving knife, and the elastic sheet is in contact with the force-bearing end face to press and make the blade at the top of the moving knife fit with the inner surface of the stationary knife mesh; the force-bearing end face is inclined relative to the vertical line of the rotation axis Y of the moving knife seat, and the inclination direction of the force-bearing end face is toward the rotation axis Y of the moving knife seat.

[0006] Preferably, the horizontal extension line X of the lowest point of the force-bearing end surface is perpendicular to the rotation axis Y of the movable tool holder, and the inclination angle S between the edge line of the force-bearing end surface and the horizontal extension line X is: 30°≤S<0°.

[0007] Preferably, the edge line of the force-bearing end surface is parallel to a connecting line L between the highest points at both ends of the moving knife blade.

[0008] Preferably, a limit block is provided at the bottom of the movable knife, and a limit groove is provided on the limit block; the limit block is located in the middle of the force-bearing end surface, and the elastic sheet is respectively pressed against and contacted with the force-bearing end surfaces on both sides of the limit groove.

[0009] Preferably, the elastic sheet includes an elastic sheet body, an elastic tongue sheet and a fixed sheet, one end of the elastic tongue sheet is fixedly connected to the elastic sheet body as a whole, and the other end is U-shaped and pressed against the force-bearing end surfaces on both sides of the limiting groove at the bottom of the moving knife; the fixed sheet is arranged on the opposite side of the joint between the elastic tongue sheet and the elastic sheet body and is inserted into the limiting groove of the limiting block at the bottom of the moving knife so that the moving knife can be detachably connected to the moving knife seat.

[0010] Preferably, a rivet hole is provided at the junction of the spring body and the spring tongue piece, and a rivet column is provided at the corresponding position at the bottom of the movable knife seat. The rivet hole is sleeved outside the rivet column so that the spring body and the movable knife seat are riveted and fixed.

[0011] Preferably, the movable knife is provided with at least three pieces, on which are respectively provided elastic tongue pieces pressed against the force-bearing end surface of the bottom of the movable knife and fixed pieces limiting the movable knife, and the elastic tongue pieces and fixed pieces are respectively arranged in a circular array on the elastic piece body.

[0012] On the basis of the above technical solutions, the applicant also proposes a technical solution for a shaver, which includes the rotating blade assembly described in any one of the above items.

[0013] The beneficial effect of the present invention is that an inclined force-bearing end face facing the rotating axis of the moving knife seat is arranged at the bottom of the moving knife, and when the extrusion force applied by the elastic sheet to the force-bearing end face of the moving knife causes the blade of the moving knife to contact the inner surface of the stationary knife mesh, the directions of the reaction force and the centripetal force generated by the inner surface of the stationary knife mesh can be close to or kept overlapping, thereby reducing the extrusion force applied by the elastic sheet to the moving knife as much as possible due to the decomposition of the arc surface of the stationary knife mesh, thereby ensuring the holding force between the moving knife and the inner surface of the stationary knife mesh, improving the hair trimming effect of the moving knife, avoiding the hair pulling phenomenon, and effectively reducing the friction resistance between the moving knife and the stationary knife mesh, reducing the temperature rise and working noise of the moving knife and the stationary knife mesh, and improving the comfort of use of the rotating knife group. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The cross-sectional structure diagram of the existing rotary knife group

[0015] Figure 2 This is a partial assembly structure diagram of the moving knife and the static knife mesh in the existing rotary knife group

[0016] Figure 3 A cross-sectional structural diagram of a rotary knife assembly according to an embodiment of the present invention

[0017] Figure 4 The partial assembly structure diagram of the moving knife and the static knife mesh in the embodiment of the present invention is shown in FIG.

[0018] Figure 5 The main structural diagram of the moving knife in the embodiment of the present invention

[0019] Figure 6 The assembly structure diagram of the movable knife and the elastic sheet in the embodiment of the present invention is shown in FIG.

[0020] Figure 7 The 3D diagram of the assembly of the moving knife and the elastic sheet in the embodiment of the present invention

[0021] Figure 8 A three-dimensional assembly diagram of the movable knife seat, the elastic sheet and the movable knife in an embodiment of the present invention DETAILED DESCRIPTION

[0022] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0023] like Figure 3-8As shown, the present invention is a rotating knife group, including a stationary knife mesh 1 and a moving knife 2, the moving knife 2 is placed in a moving knife seat 4 and is pressed and matched with an elastic sheet 3 fixed on the moving knife seat 4; a force-bearing end face 21 is provided at the bottom of the moving knife 2, and the elastic sheet 3 is in contact with the force-bearing end face 21 to press so that the blade at the top of the moving knife 2 fits with the inner surface of the stationary knife mesh 1; the force-bearing end face 21 is inclined relative to the vertical line of the rotation axis Y of the moving knife seat 4, and the inclination direction of the force-bearing end face 21 is toward the rotation axis Y of the moving knife seat 4. Compared with the traditional structure of the movable knife 2, an inclined force-bearing end surface 21 is arranged at the bottom of the movable knife 2, which is directed toward the rotation axis Y of the movable knife seat 4 (that is, the force-bearing end surface 21 at the bottom of the movable knife 2 is directed from the outside to the center axis direction of the stationary knife mesh 1). When the extrusion force applied by the elastic sheet 3 to the force-bearing end surface 21 of the movable knife 2 causes the blade of the movable knife 2 to contact the inner surface of the stationary knife mesh 1, the directions of the reaction force and the centripetal force generated on the inner surface of the stationary knife mesh 1 can be close to or kept overlapping, thereby minimizing the extrusion force applied by the elastic sheet 3 to the movable knife 2 due to the decomposition of the arc surface of the stationary knife mesh 1, thereby ensuring the holding force between the movable knife 2 and the inner surface of the stationary knife mesh 1, thereby improving the hair trimming effect of the movable knife 2 and avoiding the hair pulling phenomenon, and at the same time effectively reducing the friction resistance between the movable knife 2 and the stationary knife mesh 1, reducing the temperature rise and working noise of the movable knife 2 and the stationary knife mesh 1, and improving the comfort of use of the rotating knife group.

[0024] In order to maximize the retention force between the moving knife 2 and the inner surface of the static knife mesh 1, ensure the trimming effect of the moving knife 2, and avoid the phenomenon of pulling hair, the horizontal extension line X of the lowest point of the force end face 21 is perpendicular to the rotation axis Y of the moving knife seat 4, and the inclination angle S between the edge line of the force end face 21 and the horizontal extension line X is: 30°≤S<0°. In the actual production process, the inclination angle S of the force end face 21 at the bottom of the moving knife 2 will be adjusted according to the arc degree (also known as arc depth, the arc degree can be understood as arc depth below) of the static knife mesh 1, and is proportional to the arc degree of the static knife mesh 1. That is, when the arc degree of the static knife mesh 1 becomes larger, the inclination angle S of the force end face 21 becomes larger accordingly; and when the arc degree of the static knife mesh 1 becomes smaller, the inclination angle S of the force end face 21 also becomes smaller accordingly. The specific setting rule is to intercept an arc length that contacts the blade of the moving knife 2 at the point where the inner surface of the stationary knife mesh 1 contacts the blade of the moving knife 2, and connect the two ends of the arc length with a straight line so that the straight line is nearly parallel to the edge of the force-bearing end face 21 at the bottom of the moving knife 2. In this way, when the blade of the moving knife 2 contacts and fits with the inner surface of the stationary knife mesh 1 under the extrusion pressure of the elastic sheet 3, it can ensure to the greatest extent that the directions of the reaction force and centripetal force generated on the inner surface of the stationary knife mesh 1 are close to overlapping, avoiding the weakening of the extrusion pressure applied by the elastic sheet 3 to the moving knife 2, thereby ensuring the trimming effect between the moving knife 2 and the stationary knife mesh 1, reducing temperature rise and working noise, and improving the comfort of use of the rotating knife group.

[0025] In order to avoid the extrusion force exerted by the elastic sheet 3 on the force-bearing end face 21 at the bottom of the movable blade 2 to the greatest extent, which is decomposed by the inner surface of the static blade mesh 1 and weakens the holding force between the movable blade 2 and the static blade mesh 1, thereby affecting the hair trimming effect and trimming efficiency of the movable blade 2, the sideline of the force-bearing end face 21 is parallel to the connecting line L between the highest points at both ends of the blade of the movable blade 2. The sideline of the force-bearing end face 21 at the bottom of the movable blade 2 is parallel to the connecting line L between the highest points at both ends of the blade of the top of the movable blade 2. When the elastic sheet 3 exerts extrusion force on the force-bearing end face 21, the directions of the reaction force and the centripetal force generated by the inner surface of the static blade mesh 1 can be close to overlapping, so that the reaction force and the centripetal force are kept in a relatively parallel direction with the extrusion force of the elastic sheet 3, and the extrusion force exerted by the elastic sheet 3 on the movable blade 2 is avoided to the greatest extent, thereby ensuring the trimming effect between the movable blade 2 and the static blade mesh 1, reducing temperature rise and working noise, and improving the comfort of use of the rotary blade assembly.

[0026] During the use of the rotating knife group, the static knife mesh 1 will be subjected to external squeezing force and will be concave and deformed inwards. In order to prevent the movable knife 2 from being separated from the elastic sheet 3 in the process of sliding downward to protect the static knife mesh 1 and the blade of the movable knife 2, a limit block 22 is provided at the bottom of the movable knife 2, and a limit groove 23 is provided on the limit block 22; the limit block 22 is located in the middle of the force-bearing end surface 21, and the elastic sheet 3 is respectively pressed and contacted with the force-bearing end surfaces 21 on both sides of the limit groove 23. By adding a limit block 22 in the middle of the force-bearing end surface 21 at the bottom of the movable knife 2, the elastic sheet 3 is respectively pressed and contacted with the force-bearing end surfaces 21 on both sides of the limit block 22. In this way, when the static knife mesh 1 is forced to be concave inwards to squeeze the movable knife 2, the movable knife 2 is blocked by the limit block 22 during the downward displacement, which can effectively prevent it from being separated from the elastic sheet 3, thereby ensuring the safety of the movable knife 2. Moreover, the force-bearing end faces 21 at both ends of the limiting block 22 are respectively pressed against the elastic sheet 3, which can ensure the force balance on both sides of the moving knife 2 to the greatest extent, effectively avoid the uneven force on both sides of the moving knife 2 affecting the contact and fit between the blade of the moving knife 2 and the static knife mesh 1, and ensure the hair trimming effect. Secondly, a limiting groove 23 is set on the limiting block 22. When the bottom of the moving knife 2 is inserted into the moving knife seat 4, the elastic sheet 3 can support the force-bearing end face 21 at the bottom of the moving knife 2 through a part, and the other part can be inserted into the limiting groove 23 so that the moving knife 2 can slide up and down under the action of external force to form a dynamic connection with the moving knife seat 4, ensuring that the moving knife 2 is connected and fixed to the moving knife seat 4, and the moving knife 2 can also keep in contact and fit with the inner surface of the static knife mesh 1 under the elastic force of the elastic sheet 3, and when the static knife mesh 1 is stressed, the moving knife 2 can move downward to protect the static knife mesh 1 and the blade of the moving knife 2.

[0027] In order to improve the hair trimming effect and the rotation balance of the moving blade seat 4, the moving blade 2 is provided with three pieces and is installed on the moving blade seat 4 in a circular array, so as to prevent the moving blade seat 4 from shaking or polarizing during the rotation process, improve the comfort of the rotating blade group when in use and reduce the noise during operation. In order to facilitate the fixing of each moving blade 2, the elastic sheet 3 is provided with a spring tongue piece 31 in a circular array, and the ends of the spring tongue piece 31 are U-shaped and are respectively placed on both sides of the limit block 22 to press against the force-bearing end surface 21 at the bottom of the moving blade 2 so that the blade of each moving blade 2 is respectively in contact with the inner surface of the static blade mesh 1, ensuring that the force on both sides of the moving blade 2 is balanced, avoiding the gap between the blade on the other side of the moving blade 2 and the static blade mesh 1 due to excessive force on one side of the moving blade 2, thereby affecting the hair trimming effect. In order to prevent the movable knife 2 from being separated from the movable knife seat 4, a fixing piece 32 is provided on the elastic piece 3, and the fixing piece 32 is inserted into the limiting groove 23 of the limiting block 22 at the bottom of the movable knife 2 so that the movable knife 2 can slide up and down and be fixed in the movable knife seat 4. In order to ensure the production and processing of each elastic tongue piece 31 and the fixing piece 32, each elastic tongue piece 31 and the fixing piece 32 are respectively integrated with the elastic piece body 33, so that during production and processing, they can be integrally formed through a stamping process, thereby improving the production efficiency of the elastic tongue piece 31 and the fixing piece 32 and reducing the production cost.

[0028] In order to facilitate the installation and fixation of the elastic sheet 3 and ensure the elastic force of the elastic tongue sheet 31, a rivet hole 34 is provided at the joint of the elastic sheet body 33 and the elastic tongue sheet 31, and a rivet column 41 is provided at the corresponding position of the bottom of the movable knife seat 4. The rivet hole 34 is sleeved outside the rivet column 41 so that the elastic sheet body 33 and the movable knife seat 4 are riveted and fixed. The movable knife seat 4 is provided with a rivet column 41, and the rivet hole 34 is provided at the joint of the elastic sheet body 33 and the elastic tongue sheet 31. During assembly, the rivet hole 34 can be sleeved outside the rivet column 41 to rivet and fix the elastic sheet 3 to the bottom of the movable knife seat 4, thereby ensuring the firmness of the connection between the elastic sheet 3 and the movable knife seat 4. The rivet hole 34 is set at the junction of the spring sheet body 33 and the spring tongue sheet 31, which can effectively prevent the spring tongue sheet 31 from sagging under the action of its own gravity, ensure the resilience of the spring tongue sheet 31 after being compressed, and prevent the contact retention force between the movable knife 2 and the static knife mesh 1 from weakening. While improving the hair trimming effect of the movable knife 2, the friction resistance between the movable knife 2 and the static knife mesh 1 is reduced, and the temperature rise and working noise of the movable knife 2 and the static knife mesh 1 are reduced, thereby improving the comfort of use of the rotary knife group. Of course, the elastic sheet 3 and the movable knife seat 4 may not be fixed by riveting. For example, a clamping groove is set on the elastic sheet 3, and a clamping hook is set at the bottom of the movable knife seat 4. The same purpose can be achieved by clamping the clamping hook into the clamping groove to clamp the elastic sheet 3 and the movable knife seat 4. However, due to the clamping hook structure, it is not conducive to the demolding and integral injection molding of the movable knife seat 4. Therefore, the implementation of this embodiment is a preferred implementation.

[0029] In order to ensure the dynamic balance of the rotating blade assembly and improve the hair trimming efficiency, the movable blade 2 is provided with at least three pieces, and the elastic piece 3 is provided with a spring tongue piece 31 that is pressed against the force-bearing end surface 21 at the bottom of the movable blade 2 and a fixed piece 32 that limits the movable blade 2. The spring tongue piece 31 and the fixed piece 32 are respectively arranged in a circular array on the elastic piece body 33. Three movable blades 2 are arranged on the movable blade seat 4 in a circular array, which can ensure the dynamic balance during the rotation of the movable blade seat 4, effectively prevent the movable blade seat 4 from shaking or polarizing, reduce the vibration of the rotating blade assembly when working, reduce the working noise, ensure the hair trimming effect of the rotating blade assembly and improve the comfort of use of the rotating blade assembly. During the assembly of the moving knife 2, the spring tongue pieces 31 of the elastic pieces 3 are pressed against the force-bearing end faces 21 at the bottom of each moving knife 2 so that the blades of each moving knife 2 are respectively in contact with and fit with the inner surface of the static knife mesh 1, and then the fixing pieces 32 are inserted into the limiting grooves 23 in the limiting blocks 22 at the bottom of the moving knife 2 so that each moving knife 2 can be detachably fixed in the moving knife seat 4. While facilitating the installation of the moving knife 2, the moving knife 2 can also automatically overcome the elastic force of the spring tongue pieces 31 to move downward after the static knife mesh 1 is stressed, protecting the blade of the moving knife 2 and the static knife mesh 1 from being damaged due to excessive force. Of course, in actual use, the moving knife 2 can also be set to six or more pieces, but since the dynamic balance effect of three pieces is the best, the implementation of this embodiment is the preferred implementation.

[0030] On the basis of the above technical solutions, the applicant also proposes a technical solution for a shaver, which includes the rotating blade assembly described in any one of the above items.

[0031] The above embodiments should not be regarded as limiting 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 rotary knife assembly, comprising a stationary knife mesh and a moving knife, wherein the moving knife is placed in a moving knife seat and is pressed against an elastic sheet fixed on the moving knife seat; characterized in that A force-bearing end face is provided at the bottom of the moving knife, and the elastic sheet contacts and presses against the force-bearing end face so that the blade at the top of the moving knife fits with the inner surface of the static knife mesh; the force-bearing end face is inclined relative to the vertical line of the rotation axis Y of the moving knife seat, and the inclination direction of the force-bearing end face is toward the rotation axis Y of the moving knife seat.

2. A rotary knife assembly according to claim 1, characterized in that The horizontal extension line X of the lowest point of the force-bearing end surface is perpendicular to the rotation axis Y of the movable tool holder, and the inclination angle S between the edge line of the force-bearing end surface and the horizontal extension line X is: 30°≤S<0°.

3. The rotary knife assembly according to claim 1, characterized in that The edge line of the force-bearing end face is parallel to the connecting line L between the highest points at both ends of the moving knife blade.

4. The rotary knife assembly according to claim 1, characterized in that A limit block is arranged at the bottom of the movable knife, and a limit groove is arranged on the limit block; the limit block is located in the middle of the force-bearing end surface, and the elastic sheet is respectively pressed and contacted with the force-bearing end surfaces on both sides of the limit groove.

5. The rotary knife assembly according to claim 4, characterized in that The elastic sheet includes an elastic sheet body, an elastic tongue sheet and a fixed sheet. One end of the elastic tongue sheet is fixedly connected to the elastic sheet body as a whole, and the other end is U-shaped and pressed against the force-bearing end surfaces on both sides of the limiting groove at the bottom of the moving knife; the fixed sheet is arranged on the opposite side of the joint between the elastic tongue sheet and the elastic sheet body and is inserted into the limiting groove of the limiting block at the bottom of the moving knife so that the moving knife can be detachably connected to the moving knife seat.

6. A rotary knife assembly according to claim 5, characterized in that A rivet hole is provided at the joint of the spring body and the spring tongue piece, a rivet column is provided at the corresponding position of the bottom of the movable knife seat, and the rivet hole is sleeved outside the rivet column to rivet and fix the spring body and the movable knife seat.

7. The rotary knife assembly according to claim 5, characterized in that The movable knife is provided with at least three pieces, and the elastic piece is provided with a spring tongue piece pressed against the force-bearing end surface of the bottom of the movable knife and a fixed piece limiting the movable knife. The spring tongue piece and the fixed piece are arranged in a ring array on the elastic piece body.

8. A razor, characterized in that The utility model comprises a rotating knife group as claimed in any one of claims 1 to 7.

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