Cutting head assembly and shaver

Abstract

The present invention relates to a cutter head assembly and a razor, which is characterized in that a first elastic member presses against a fine-cutting movable knife and a rough-cutting fixed knife respectively, so that the fine-cutting movable knife always keeps in contact with the fine-cutting fixed knife with the rough-cutting fixed knife as a reference, and can be displaced up and down along the axis of the fine-cutting fixed knife under the action of an external force; the rough-cutting movable knife is placed below the rough-cutting fixed knife and the movable tooth portion of the rough-cutting movable knife keeps its end faces in contact with the fixed tooth portion under the pressure of a second elastic member. The beneficial effect of the present invention is that the first elastic member and the second elastic member do not need to rely on a swinging member as a support basis, thereby avoiding irregular movement of the first elastic member and the second elastic member during the shaving process, causing the fine-cutting movable knife and the rough-cutting movable knife to jump and cause the cutter head assembly to pull or rip hair, thereby not causing a pulling pain to the skin; and the rough-cutting movable knife is installed below the rough-cutting fixed knife to avoid direct contact between the rough-cutting movable knife and the skin, effectively preventing the rough-cutting movable knife from cutting the skin, and improving the comfort and safety of the cutter head assembly.

Description

Technical Field

[0001] The present invention relates to a hair trimming device, and more particularly to a cutter head assembly and a razor for shaving body hair, and is mainly used in the field of shaving tools. Background Art

[0002] Shaving tools for shaving body hair on the market are mainly divided into hair clippers for trimming hair, razors for trimming beards, and razors for shaving armpit hair, leg hair, etc., according to the type of hair. Most existing razors for shaving body hair, such as armpit hair or leg hair, have two sets of blades at the same time, one is a rough cutting unit for trimming long hair, and the other is a fine cutting unit for shaving short hair on the skin surface or at the hair roots. For example, the razor of Chinese patent CN114888852A Figure 5 Or Chinese patent CN111687891A Figure 3 As shown, the coarse and fine shearing knives in both the roughing and fine shearing units require one end of a spring to press against an oscillating member in order to engage with the corresponding coarse and fine shearing fixed knives. As a result, during the shaving process, the high-frequency reciprocating motion of the oscillating member causes the spring to move irregularly, which can easily cause the fine shearing knives to jump, pulling or pinching hair, and causing painful skin pulling. Summary of the Invention

[0003] In order to solve the above technical problems, the present invention provides a cutter head assembly and a razor. The cutter head assembly can always keep the fine cutting movable knife and the rough cutting movable knife in close contact with the corresponding fine cutting fixed knife and the rough cutting fixed knife without the aid of an oscillating part, thereby avoiding the fine cutting movable knife and the rough cutting movable knife from jumping due to the high-frequency reciprocating oscillation of the oscillating part, avoiding the pulling or pinching of hair that causes pulling pain on the skin, and improving the comfort of use and hair trimming performance of the cutter head assembly.

[0004] In order to solve the above technical problems, the technical solution adopted by the present invention is a cutter head assembly, including a cutter head seat, in which at least a rough shearing unit for cutting long hair short and a fine shearing unit for shaving short hair are installed, the rough shearing unit includes a rough shearing fixed knife and a rough shearing movable knife, and the fine shearing unit includes a fine shearing fixed knife and a fine shearing movable knife; a fixed tooth portion is provided on at least one side of the two sides of the rough shearing fixed knife, and is installed in the cutter head seat so that the fixed tooth portion is at the edge of the cutter head seat, the fine shearing fixed knife is located above the rough shearing fixed knife and is connected to the cutter head seat, and the fine shearing movable knife can reciprocate under the drive of the swinging member The swinging member is placed between the fine shearing fixed knife and the rough shearing fixed knife; the first elastic member presses the fine shearing movable knife and the rough shearing fixed knife respectively, and the fine shearing movable knife is always kept in contact with the fine shearing fixed knife with the rough shearing fixed knife as the reference and can be displaced up and down along the axis of the fine shearing fixed knife under the action of external force; the rough shearing movable knife is placed below the rough shearing fixed knife and is pressed by the second elastic member so that the movable tooth portion and the fixed tooth portion of the rough shearing movable knife always keep the end faces in contact, and the rough shearing movable knife can swing back and forth along the rough shearing fixed knife under the drive of the swinging member; the second elastic member is detachably connected to the cutter head seat and is located below the rough shearing movable knife.

[0005] Preferably, a through fixed knife hole and a movable knife hole are provided on the rough shearing fixed knife and the rough shearing movable knife respectively; one end of the swinging member is placed in the fixed knife hole and the movable knife hole, and the other end is linked to the external driving device; a first connecting member is provided on the swinging member for connecting the fine shearing movable knife, so that the fine shearing movable knife is synchronously linked to the swinging member, and can be displaced up and down along the axial direction of the swinging member after being subjected to force; and a second connecting member is provided for connecting the rough shearing movable knife, so that the rough shearing movable knife is synchronously linked to the swinging member.

[0006] Preferably, the first connecting member is a first clamping plate with an inclined surface, which is arranged on the opposite side wall of the swinging member perpendicular to the swinging direction, and a first clamping slot with a height greater than the height of the first clamping plate is provided in the fine-cutting movable knife. The first clamping plate is inserted into the first clamping slot so that the fine-cutting movable knife and the swinging member are synchronously linked and the first clamping plate can be moved up and down along the axis of the first clamping slot after the fine-cutting movable knife is subjected to force; the second connecting member is a limit block with a socket provided on the two end side walls corresponding to the swinging direction of the swinging member, and a bending hook is provided on the hole wall opposite to the movable knife hole of the rough-cutting movable knife. The bending hook is inserted into the socket of the limit block so that the rough-cutting movable knife and the swinging member are synchronously linked.

[0007] Preferably, the cross-sections of the rough shearing fixed knife and the rough shearing movable knife are both U-shaped, and the fixed tooth portion and the movable tooth portion are respectively arranged at the ends of the two side walls of the U-shape and extend outward; the U-shaped width and height of the rough shearing movable knife are greater than the corresponding U-shaped width and height of the rough shearing fixed knife; a guide hole is provided at the U-shaped bottom of the rough shearing fixed knife, and a bent guide piece is provided at the U-shaped bottom of the rough shearing movable knife to be inserted into the guide hole.

[0008] Preferably, the fixed tooth portion of the rough shearing fixed knife is provided with a plurality of cutting teeth arranged at intervals, the tooth tip of each cutting tooth is inclined relative to the end face of the fixed tooth portion, and a tooth protrusion is provided on at least one of the upper and lower surfaces of the tooth tip of each cutting tooth, and the tooth protrusion is semicircular so that the tooth tip surface of each cutting tooth is arc-shaped.

[0009] Preferably, the cutter head seat includes end plates that limit its length at the left and right ends, and side plates for connecting the two end plates. A tongue plate is provided on each end plate, and a second clamping platform with a bevel is provided on the inner side surface of each tongue plate; the two end surfaces of the U-shaped bottom plate of the rough shearing fixed knife are respectively fitted with the side plates and the end surfaces of the second clamping platform, so that the rough shearing fixed knife is detachably fixed to the cutter head seat.

[0010] Preferably, a limiting piece is provided on both sides of the tongue plate on the inner side surface of each end plate, and an open second slot is provided at both ends of the U-shaped bottom plate of the rough shearing fixed knife, and the second slots are respectively inserted into the outside of the limiting piece to form a radial limit between the rough shearing fixed knife and the cutter head seat; a third clamping platform with an inclined surface is provided at the end of each limiting piece, and an open third slot and a spring tongue piece are respectively provided at both ends of the second elastic member, and the third slot is inserted into the outside of the third clamping platform, and each spring tongue piece is pressed against the end face of the rough shearing movable knife so that the end face of the third clamping platform fits with the end face of the second elastic member, so that the second elastic member is detachably fixed in the cutter head seat.

[0011] Preferably, a plurality of spaced and through-going square holes are provided on the side plate connecting the end plate in the cutter head seat, and at least one plug plate with a length less than the height of the square hole is provided on the upper side wall of each square hole; the fine shearing movable knife is a thin sheet with a thickness less than 0.2 mm, and has mounting holes 41 on both sides thereof equal to the number of the plug plates, and each mounting hole 41 is respectively arranged on the outside of the plug plate so that the fine shearing movable knife can be detachably installed in the cutter head seat.

[0012] Preferably, the fine shearing movable knife includes a plurality of movable blades, each movable blade is arranged at intervals on the movable knife seat and is injection molded integrally with the movable knife seat; the first card slot of the fine shearing movable knife is arranged in the movable knife seat; spring columns are respectively provided at both ends of the bottom of the movable knife seat, and a positioning column protruding from the surface is provided on the U-shaped bottom plate of the rough shearing fixed knife. The first elastic member is a spring, and its two ends are respectively sleeved on the outside of the spring column and the positioning column, and are pressed against the movable knife seat and the rough shearing fixed knife so that each movable blade is respectively fitted with the inner surface of the fine shearing fixed knife, and can be vertically displaced up and down under the action of external force.

[0013] Based on the above embodiments, the applicant also proposes a technical solution for a razor, comprising a cutter head assembly as described in any one of the above embodiments.

[0014] The beneficial effects of the present invention are:

[0015] 1. The first elastic member is placed between the fine-cut movable knife and the rough-cut fixed knife to press the fine-cut movable knife and the rough-cut fixed knife respectively, so as to ensure that the fine-cut movable knife and the fine-cut fixed knife can always keep in close contact with each other in any state. The installation structure of the first elastic member is optimized, and there is no need to use the swinging member as a supporting basis, so as to avoid the irregular movement of the first elastic member during the shaving process of the cutter head assembly, and prevent the fine-cut movable knife from jumping due to the movement of the first elastic member under the high-frequency reciprocating swing of the swinging member, resulting in the cutter head assembly producing hair pulling or pulling hair. It will not cause pulling pain to the skin, thereby improving the comfort of shaving with the cutter head assembly and ensuring the shaving performance of the cutter head assembly.

[0016] 2. The removable connection between the second elastic member and the cutter head holder and their placement below the roughing shear blade eliminates the need for a swinging member as a support base, thus disassociating the second elastic member from the swinging member. When the swinging member drives the roughing shear blade back and forth, the second elastic member does not swing back and forth with the swinging member. Therefore, the possibility of the second elastic member shifting is eliminated, preventing the roughing shear blade from jumping relative to the roughing shear fixed blade, which could cause hair pulling or tugging on the cutter head assembly. This prevents any painful pulling sensation on the skin, thereby improving the user comfort of the cutter head assembly and ensuring shaving performance.

[0017] 3. Place the roughing shear movable blade below the roughing shear fixed blade, and under the pressure of the second elastic member, keep the movable teeth of the roughing shear movable blade and the fixed teeth of the roughing shear fixed blade in constant end-to-end contact, thus avoiding direct contact between the roughing shear movable blade and the skin. When the swinging member drives the roughing shear movable blade to swing back and forth along the roughing shear fixed blade, it can effectively prevent the roughing shear movable blade from cutting the skin, improving the safety of the cutter head assembly during shaving. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A three-dimensional structural diagram of a cutter head assembly according to an embodiment of the present invention

[0019] Figure 2 A longitudinal sectional view of a cutter head assembly according to an embodiment of the present invention

[0020] Figure 3 A transverse cross-sectional view of a cutter head assembly according to an embodiment of the present invention

[0021] Figure 4 A three-dimensional structural diagram of the cutter head seat in an embodiment of the present invention

[0022] Figure 5 A side view of a rough shearing fixed knife according to an embodiment of the present invention

[0023] Figure 6 A three-dimensional structural diagram of a rough shearing fixed knife in an embodiment of the present invention

[0024] Figure 7 A three-dimensional structural diagram of a rough shearing blade according to an embodiment of the present invention

[0025] Figure 8 A three-dimensional structural diagram of the second elastic member in an embodiment of the present invention

[0026] Figure 9 A three-dimensional structural diagram of the swing member in an embodiment of the present invention

[0027] Figure 10 A three-dimensional structural diagram of the fine shearing blade in an embodiment of the present invention

[0028] Figure 11 Exploded view of the cutter head assembly according to an embodiment of the present invention DETAILED DESCRIPTION

[0029] The following is combined with Figure 1-11 The embodiments of the present invention are further described as follows:

[0030] The present invention is a blade assembly for shaving body hair. Since body hair continues to grow throughout a person's life cycle, the growth rate of body hair varies slightly depending on the body part. Therefore, body hair can be of different lengths. When the hair length exceeds 5 mm, it is affected by external factors such as static electricity or oil secreted by the skin, forming a random curl. In order to meet the user's requirements for shaving long and short body hair, the existing razor blade assembly includes a blade head base 1. A rough cutting unit for cutting long hair short is installed in the blade head base 1. The rough cutting unit includes a rough cutting fixed blade 2 and a rough cutting movable blade 3. Both have an open cutting tooth 211 structure similar to a hair clipper or a sideburn razor. Due to the material thickness of the rough cutting fixed blade 2, the hair can only be cut short and the roots of the hair on the skin surface cannot be completely shaved. Therefore, the cutter head seat 1 also needs to be equipped with a fine-cutting unit for shaving short hairs at the same time. The fine-cutting unit includes a fine-cutting fixed knife 4 and a fine-cutting movable knife 5. The fine-cutting fixed knife 4 is a mesh, and it is a relatively closed structure after installation. Hair only enters through a number of guide holes set on the mesh. Due to its thin thickness, when the fine-cutting fixed knife 4 contacts the skin, the short hair or hair roots on the skin will enter the fine-cutting fixed knife 4 through the guide holes. If the user gently presses the razor to make the fine-cutting fixed knife 4 squeeze the skin, the short hair or hair roots will be exposed in the guide holes as much as possible. The fine-cutting movable knife 5 swings back and forth along the fine-cutting fixed knife 4 driven by the swinging member 6 to cut the hair roots, thereby achieving a fine-cut shaving effect. To facilitate the rough shearing unit in shortening longer body hair, a fixed tooth portion 21 is provided on at least one side of the rough shearing fixed blade 2. In actual production, this can be provided according to the actual structure of the razor. The fixed tooth portion 21 can be provided on one side of the rough shearing fixed blade 2 or on both sides of the rough shearing fixed blade 2. When the rough shearing fixed blade 2 is detachably connected to the blade head holder 1, the fixed tooth portion 21 is located at one or both sides of the blade head holder 1 and extends horizontally or obliquely toward the outside of the blade head holder 1. A plurality of cutting teeth 211 are provided on the fixed tooth portion 21, and hair guide grooves 212 are formed between adjacent cutting teeth 211 for separating and guiding hair.

[0031] Since the existing cutter head assembly used in razors, the two blades in the fine cutting unit and the rough cutting unit need to rely on the swinging member 6 as support for fitting, but the swinging member 6 is directly connected to the eccentric shaft (not shown in the figure) on the motor output shaft installed in the razor housing. The motor speed is basically above 3000 rpm. Using the swinging member 6 as the basic support will not cause any adverse effects when it is static. However, when the razor is started, the motor rotates at high speed, and the eccentric shaft drives the swinging member 6 to swing back and forth in a straight line (the eccentric shaft changes the rotational motion of the motor into a reciprocating linear motion of the swinging member 6. Every time the eccentric shaft rotates one circle with the motor output shaft, it can drive the swinging member 6 to swing back and forth once, which means that the number of reciprocating swings of the swinging member 6 is twice the motor speed). The fine cutting unit and the rough cutting unit supported by the swinging member 6 are very likely to move, resulting in adverse phenomena such as knife jumping. In order to solve the technical defects of using the swinging part 6 as the basic support part, which makes it easy for the knife to jump, the rough shearing fixed knife 2 is fixed to the knife head seat 1 in a detachable manner, and the fine shearing fixed knife 4 is located above the rough shearing fixed knife 2 and is detachably connected to the knife head seat 1. In this way, a swinging space is formed between the rough shearing fixed knife 2 and the fine shearing fixed knife 4. During assembly, the fine shearing movable knife 5 can swing back and forth between the fine shearing fixed knife 4 and the rough shearing fixed knife 2 under the drive of the swinging part 6. The first elastic part 7 can press the fine shearing movable knife 5 and the rough shearing fixed knife 2 respectively, and with the rough shearing fixed knife 2 as the reference, the fine shearing movable knife 5 is always kept in contact with the fine shearing fixed knife 4, so that the fine shearing movable knife 5 can move up and down along the axial direction of the fine shearing fixed knife 4 when the fine shearing fixed knife 4 is subjected to external force. The fine-cutting movable knife 5 is placed between the fine-cutting fixed knife 4 and the rough-cutting fixed knife 2, and the first elastic member 7 can be placed between the two to press the fine-cutting movable knife 5 and the rough-cutting fixed knife 2 respectively to ensure that the fine-cutting movable knife 5 and the fine-cutting fixed knife 4 can always maintain a fit state in any state, and the installation structure of the first elastic member 7 is optimized. There is no need to rely on the swinging member 6 as a supporting basis, which avoids the irregular movement of the first elastic member 7 during the shaving process of the cutter head assembly, and prevents the fine-cutting movable knife 5 from jumping due to the movement of the first elastic member 7 under the high-frequency reciprocating swing of the swinging member 6, resulting in the cutter head assembly producing hair pulling or pulling hair. It will not cause pulling pain to the skin, thereby improving the comfort of shaving with the cutter head assembly and ensuring the shaving performance of the cutter head assembly. Furthermore, the first elastic member 7 is pressed between the fine cutting movable blade 5 and the rough cutting fixed blade 2. When the fine cutting fixed blade contacts the skin and is bent and deformed by the force, the fine cutting movable blade 5 can overcome the elastic force of the first elastic member 7 and move downward, leaving a buffer space for the bending deformation of the fine cutting fixed blade, thereby preventing the fine cutting fixed blade 4 and the fine cutting movable blade 5 from being damaged by the force, thereby improving the safety of the fine cutting fixed blade 4 and the fine cutting movable blade 5. When the fine cutting fixed blade 4 is no longer in contact with the skin and the external force disappears, the elastic force of the first elastic member 7 can press the fine cutting movable blade 5 to automatically move upward, causing the fine cutting fixed blade 4 to return to its original state, thereby ensuring the hair cutting performance of the cutter head assembly.

[0032] To prevent the movable teeth 31 of the roughing blade 3 from directly contacting the skin and causing cuts during the trimming process, the roughing blade 3 is positioned below the fixed blade 2. The second elastic member 8 acts to maintain end-to-end contact between the movable teeth 31 of the roughing blade 3 and the fixed teeth 21 of the fixed blade 2, thus preventing direct contact between the roughing blade 3 and the skin. When the swinging member 6 drives the roughing blade 3 to swing back and forth along the fixed blade 2, this prevents the roughing blade 3 from injuring the skin, thereby improving the safety of the cutter head assembly during shaving. Furthermore, the second elastic member 8 is detachably connected to the cutter head holder 1 and positioned below the roughing blade 3, eliminating the need for the swinging member 6 as a support base and decoupling the second elastic member 8 from the swinging member 6. As the swinging member 6 drives the roughing blade 3 to swing back and forth, the second elastic member 8 does not swing back and forth with the swinging member 6. Therefore, the possibility of the second elastic member 8 moving is eliminated, and the rough cutting movable knife 3 is prevented from jumping relative to the rough cutting fixed knife 2, causing the cutter head assembly to pull or rip hair. The skin will not feel pulling pain, thereby improving the comfort of shaving with the cutter head assembly and ensuring the shaving performance of the cutter head assembly.

[0033] As can be seen from the above embodiment, the reciprocating swing of the fine shearing movable knife 5 and the rough shearing movable knife 3 needs to rely on the drive of the swinging member 6. In order to facilitate the synchronous linkage of the fine shearing movable knife 5 and the rough shearing movable knife 3 with the swinging member 6, a through fixed knife hole 22 and a movable knife hole 32 are respectively provided on the rough shearing fixed knife 2 and the rough shearing movable knife 3; one end of the swinging member 6 is placed in the fixed knife hole 22 and the movable knife hole 32, and the other end is linked to an external driving device; since the rough shearing fixed knife 2 is detachably connected to the cutter head seat 1 and is fixed, it does not need to be synchronously linked with the swinging member 6. The fixed knife hole 22 must be greater than the total distance of the maximum reciprocating swing stroke of the swinging member 6, so as not to interfere with the swinging member 6. The rough shearing movable knife 3 needs to swing synchronously with the swinging member 6, and the movable knife hole 32 can be greater than or equal to the width of the swinging member 6. At the same time, the fixed knife holes 22 and the movable knife holes 32 on the rough cutting fixed knife 2 and the rough cutting movable knife 3 can also play the role of discharging broken hair. After the use of the cutter head assembly is completed, the cutter head assembly is rinsed with water. When the water flows through the cutter head assembly, the shaved broken hair can be brought out of the cutter head assembly together with the fixed knife holes 22 and the movable knife holes 32, thereby improving the hygiene of the cutter head assembly.

[0034] In order to ensure the firmness of the connection between the fine-cutting movable knife 5 and the swinging part 6 and to prevent the fine-cutting fixed knife 4 and the fine-cutting movable knife 5 from being damaged when the fine-cutting fixed knife 4 contacts the skin and is subjected to external force, the first connecting part is a first clamping platform 61 with an inclined surface, which is arranged on the opposite side wall of the swinging part 6 perpendicular to the swinging direction, and a first clamping groove 511 with a height greater than the height of the first clamping platform 61 is provided in the fine-cutting movable knife 5. The first clamping platform 61 is clamped into the first clamping groove 511 to synchronize the fine-cutting movable knife 5 with the swinging part 6 and can move the first clamping platform 61 up and down along the axial direction of the first clamping groove 511 after the fine-cutting movable knife 5 is subjected to force; by utilizing the cooperation between the first clamping platform 61 and the first clamping groove 511, when the swinging part 6 swings back and forth, the side of the first clamping platform 61 cooperates with the side of the first clamping groove 511 to synchronize the fine-cutting movable knife 5 with the swinging part 6. When the fine-cutting fixed knife 4 contacts the skin and is subjected to external force, the fine-cutting movable knife 5 is supported by the pressure of the first elastic member 7. The fine-cutting fixed knife 4 will synchronously transmit the external force to the fine-cutting movable knife 5 and overcome the elastic force of the first elastic member 7 to cause the first elastic member 7 to contract downward, thereby achieving the purpose of downward displacement of the fine-cutting movable knife 5 and providing a buffer space for the bending deformation of the fine-cutting fixed knife 4, thereby avoiding the fine-cutting fixed knife 4 and the fine-cutting movable knife 5 from being damaged by force or being damaged by the blade being broken. Of course, from the perspective of the technical effect to be achieved, the structure of the first clamping platform 61 and the first clamping groove 511 can also be omitted. For example, one or more positioning pins are provided on both sides of the body of the swinging member 6, and a vertical open groove is provided on the fine-cutting movable knife 5. The positioning pin is inserted into the open groove, and the side wall of the positioning pin cooperates with the groove wall of the open groove to achieve the synchronous swing of the fine-cutting movable knife 5 and the swinging member 6. When the fine-cutting fixed knife 4 contacts the skin and is subjected to external force, the opening slot of the fine-cutting movable knife 5 can also move up and down along the positioning pin, thereby achieving the purpose of protecting the fine-cutting fixed knife 4 and the fine-cutting movable knife 5.

[0035] To facilitate the connection between the rough shearing movable blade 3 and the swinging member 6 and improve assembly efficiency, the second connecting member is a limit block 62 with a socket 63 provided on the side walls of the swinging member 6 at both ends in the same swinging direction as the swinging member 6. A bent hook 33 is provided on the wall opposite the movable blade hole 32 of the rough shearing movable blade 3. The bent hook 33 is inserted into the socket 63 of the limit block 62 to synchronize the rough shearing movable blade 3 with the swinging member 6. By providing the bent hook 33 on the rough shearing movable blade 3, it can be stamped and formed integrally with the movable blade hole 32 during the production process, optimizing the structure. At the same time, the formed bent hook 33 can also be used to snap into the socket 63 of the limit block 62 on the side walls on opposite sides of the swinging member 6, so that the rough shearing movable blade 3 and the swinging member 6 are connected in a linked manner. The roughing blade 3, held in place by the second elastic member 8, does not undergo vertical displacement along the swinging member 6. When the bent hook 33 engages the socket 63 of the stop block 62, the connection and synchronization between the roughing blade 3 and the swinging member 6 are effectively maintained. Of course, the bent hook 33 can also be omitted. For example, positioning holes can be added on either side of the movable hole 32 of the roughing blade 3, and latches can be provided on the sidewalls of the swinging member 6. These latches can be inserted into the positioning holes to connect the roughing blade 3 and the swinging member 6. However, the use of the bent hook 33 facilitates production and assembly. Therefore, this embodiment is the preferred embodiment.

[0036] In order to prevent the increase of friction between the rough shearing fixed knife 2 and the rough shearing movable knife 3, which will lead to an increase in the surface temperature of the rough shearing fixed knife 2 and the rough shearing movable knife 3, affecting the comfort of use of the cutter head assembly or even scalding the skin. The cross-sections of the rough shearing fixed knife 2 and the rough shearing movable knife 3 are both U-shaped, and the fixed tooth portion 21 and the movable tooth portion 31 are respectively arranged at the ends of the two side walls of the U-shape and extend outward; the rough shearing fixed knife 2 and the rough shearing movable knife 3 are set in a U-shape, and when the U-shaped bottom of the rough shearing fixed knife 2 is detachably connected to the cutter head seat 1, the fixed tooth portion 21 and the movable tooth portion 31 can extend horizontally or obliquely along the corresponding two sides of the U-shape of the rough shearing fixed knife 2 and the rough shearing movable knife 3, respectively. Whether it is horizontal or oblique can be customized according to market demand or user requirements. When trimming body hair, the fixed tooth portion 21 and the movable tooth portion 31 are in contact with each other. In order to prevent other parts of the rough cutting fixed knife 2 and the rough cutting movable knife 3 from contacting and increasing the friction between the rough cutting fixed knife 2 and the rough cutting movable knife 3, the U-shaped width and height of the rough cutting movable knife 3 are greater than the corresponding U-shaped width and height of the rough cutting fixed knife 2. The U-shaped width and U-shaped height of the rough cutting movable knife 3 are increased, and the U-shaped bottom and U-shaped side walls of the rough cutting movable knife 3 maintain a certain distance from the U-shaped bottom and U-shaped side walls of the rough cutting fixed knife 2. Under the pressure of the second elastic member 8, the rough cutting movable knife 3 only keeps the movable tooth portion 31 of the rough cutting movable knife 3 in contact with the fixed tooth portion 21 of the rough cutting fixed knife 2, which ensures the hair trimming performance of the rough cutting unit while effectively avoiding the temperature rise of the rough cutting unit due to excessive contact area, thereby improving the comfort of use of the cutter head assembly. In the actual production process, the U-shaped width and U-shaped height of the rough shearing movable knife 3 are larger than the U-shaped width and U-shaped height of the rough shearing fixed knife 2 so that there is no direct contact between the two. As for the specific values, they can be determined according to the space size in the cutter head assembly. For example, if the space size in the cutter head assembly is relatively redundant, the interval between the two can be increased; and if the space in the cutter head assembly is limited, the expected technical purpose can be achieved by ensuring that the remaining components except the fixed tooth part 21 and the movable tooth part 31 do not contact each other. This embodiment does not impose further restrictions.

[0037] When the rough shearing movable knife 3 swings back and forth along the rough shearing fixed knife 2 driven by the swinging member 6, in order to prevent the rough shearing movable knife 3 from contacting the U-shaped side wall of the rough shearing fixed knife 2 due to swinging dislocation, a guide hole 23 is provided at the U-shaped bottom of the rough shearing fixed knife 2, and a bent guide piece 34 is provided at the U-shaped bottom of the rough shearing movable knife 3 to be inserted into the guide hole 23. By correspondingly providing the guide holes 23 and the bent guide pieces 34 on the rough shearing fixed knife 2 and the rough shearing movable knife 3, and utilizing the coordination and limitation of the bent guide pieces 34 and the guide holes 23, the rough shearing movable knife 3 can be effectively prevented from being dislocated and deflected during the reciprocating swinging process, ensuring that the rough shearing movable knife 3 and the rough shearing fixed knife 2 are spaced apart except for the end faces of the movable tooth portion 31 and the fixed tooth portion 21, thereby reducing the friction and temperature rise of the rough shearing unit, and utilizing the gap between the rough shearing movable knife 3 and the rough shearing fixed knife 2 to promote air convection and accelerate heat dissipation.

[0038] In order to improve the smoothness of shaving body hair, the fixed tooth portion 21 of the rough shear fixed knife 2 is provided with a plurality of cutting teeth 211 arranged at intervals. The tooth tip of each cutting tooth 211 is inclined relative to the end face of the fixed tooth portion 21, and a tooth protrusion 213 is provided on at least one of the upper and lower surfaces of the tooth tip of each cutting tooth 211. The tooth protrusion 213 is semicircular so that the tooth tip surface of each cutting tooth 211 is in the shape of a circular arc. The tooth tip of each cutting tooth 211 in the fixed tooth portion 21 of the rough shear fixed knife 2 is set to be inclined, and the inclination angle range is 5° to 75°, preferably 30°. When the fixed tooth portion 21 contacts the skin and fits the skin, the raised tooth tip of the cutting tooth 211 can prevent the tooth tip of the cutting tooth 211 from piercing into the skin and pushing the skin, ensuring that the fixed tooth portion 211 smoothly advances along the skin surface, thereby improving the smoothness of shaving. At least one of the two surfaces at the tip of each cutting tooth 211 is provided with a tooth protrusion 213. In this embodiment, the tooth protrusion 213 is provided only on the surface of each cutting tooth 211 of the fixed tooth portion 21 facing away from the skin. Of course, the tooth protrusion 213 can also be provided on both surfaces of each cutting tooth 211 of the fixed tooth portion 21, depending on customer requirements. The addition of the tooth protrusion 213 at the tip of each cutting tooth 211 of the fixed tooth portion 21 not only prevents the tooth tips of each cutting tooth 211 in the fixed tooth portion 21 from puncturing or cutting the skin, but also acts as a barrier, preventing the tooth tips of each cutting tooth 211 in the movable tooth portion 31 from directly contacting the skin, thereby improving user safety. The semicircular cross-section of the tooth protrusion 213 creates an arc-shaped tooth tip surface of each cutting tooth 211 in the fixed tooth portion 21. When the cutting teeth 211 of the fixed tooth portion 211 come into contact with the skin, the arc-shaped tooth tips of the cutting teeth 211 effectively provide protection, thereby improving the safety of the blade assembly.

[0039] In the above embodiment, the cross-section of the rough shear fixed knife 2 is defined as U-shaped. In actual production, the two sides of the U-shape are inclined. In order to facilitate assembly and avoid interference with the reciprocating swing of the rough shear movable knife 3, it can only be detachably connected and fixed to the cutter head seat 1 through the U-shaped bottom plate. To this end, the cutter head seat 1 includes end plates 11 whose length is limited at the left and right ends, and side plates 12 for connecting the two end plates 11. A tongue plate 13 is provided on each end plate 11, and a second clamping platform 14 with an inclined surface is provided on the inner side surface of each tongue plate 13; the two end surfaces of the U-shaped bottom plate of the rough shear fixed knife 2 are respectively fitted with the end surfaces of the side plates 12 and the second clamping platform 14, so that the rough shear fixed knife 2 is detachably fixed to the cutter head seat 1. During assembly, the U-shaped base of the rough shearing fixed blade 2 is simply pressed to slide the U-shaped base into the second clamping platform 14 along the inclined surface of the second clamping platform 14. The U-shaped base is then removably clamped into the cutter head holder 1 using the end surface of the second clamping platform 14 and the end surface of the side panel 12, thereby achieving rapid assembly of the rough shearing fixed blade 2. To facilitate rapid assembly of the cutter head assembly and the shaver, a fourth clamping platform 15 is provided on the outer wall of the tongue plate 13. The fourth clamping platform 15 is clamped to the body shell of the shaver (not shown in the figure), facilitating assembly of the cutter head assembly and allowing for quick disassembly and cleaning of the cutter head assembly.

[0040] The side panels 12 connected to the end panels 11 are provided with two pieces, which are connected to the inner side walls of the upper end of the end panels 11 as a whole, so that the middle area of the cutter head seat 1 is connected from top to bottom. When the U-shaped bottom plate of the rough shear fixed knife 2 is clamped under the side panels 12, the first elastic member 7 can directly press against the U-shaped bottom plate to drive the fine shear movable knife 5 and the fine shear fixed knife 4 to always keep in contact with each other, without the need for the auxiliary swing member 6 to support the first elastic member 7. Of course, the bottoms of the two side panels 12 can also be closed to form a partition plate, and the rough shear fixed knife 2 is detachably fixed to the cutter head seat 1 by the second clamping platform 14 and the partition plate. One end of the first elastic member 7 presses against the partition plate to also play a supporting role. However, this relatively increases the material cost of the cutter head seat 1 and will also affect the guide holes 23 and the bending guide pieces 34 on the rough shear fixed knife 2 and the rough shear movable knife 3. Therefore, the use of a through side panel 12 structure is the preferred embodiment.

[0041] In order to prevent the rough shearing fixed knife 2 from sliding and displacing along the width direction of the blade head seat 1 during shaving, a limiting piece 16 is provided on the inner side surface of each end plate 11 on both sides of the tongue plate 13, and an open second card groove 24 is provided at both ends of the U-shaped bottom plate of the rough shearing fixed knife 2. The second card groove 24 is respectively inserted into the outside of the limiting piece 16 to form a longitudinal limit between the rough shearing fixed knife 2 and the blade head seat 1; the limiting piece 16 provided on both sides of the tongue plate 13 and the second card groove 24 provided on the U-shaped bottom plate of the rough shearing fixed knife 2 are used to form a limit. When the U-shaped bottom plate of the rough shearing fixed knife 2 is inserted between the second clamping platform 14 and the end face of the side plate 12, the limiting piece 16 and the second card groove 24 can limit the rough shearing fixed knife 2, effectively preventing the rough shearing fixed knife 2 from sliding and displacing along the width direction of the blade head seat 1, thereby improving the shaving performance of the blade head assembly.

[0042] Since the rough shearing movable knife 3 is located below the rough shearing fixed knife 2, in order to ensure that the movable tooth portion 31 of the rough shearing movable knife 3 and the fixed tooth portion 21 of the rough shearing fixed knife 2 are always in a fit state, the second elastic member 8 can only be installed below the rough shearing movable knife 3 for the sake of quick assembly. To facilitate the assembly of the second elastic member 8, a third clamping platform 17 with an inclined surface is provided at the end of each limiting piece 16, and an open third clamping groove 81 and a spring tongue piece 82 are provided at both ends of the second elastic member 8. The third clamping groove 81 is inserted into the outside of the third clamping platform 17, and each spring tongue piece 82 is pressed against the end face of the rough shearing movable knife 3 so that the end face of the third clamping platform 17 is fit with the end face of the second elastic member 8, so that the second elastic member 8 is detachably fixed in the cutter head seat 1.

[0043] In order to facilitate the rapid assembly of the fine-shearing fixed knife 4, a plurality of spaced and through-going square holes 18 are provided on the side plate 12 connected to the end plate 11 in the cutter head seat 1, and at least one insert plate 19 whose length is less than the height of the square hole 18 is provided on the upper side wall of each square hole 18; the fine-shearing movable knife 5 is a thin sheet with a thickness of less than 0.2 mm, and has mounting holes 41 on both sides thereof equal to the number of the insert plates 19, and each mounting hole 41 is respectively arranged on the outside of the insert plate 19 so that the fine-shearing movable knife 5 can be detachably installed in the cutter head seat 1.

[0044] The fine-cutting movable knife 5 includes a plurality of movable blades 52, and each movable blade 52 is arranged at intervals on the movable knife seat 51 and is injection molded integrally with the movable knife seat 51; the first card slot 511 of the fine-cutting movable knife 5 is arranged in the movable knife seat 51; spring columns 512 are respectively provided at both ends of the bottom of the movable knife seat 51, and a positioning column 25 protruding from the surface is provided on the U-shaped bottom plate of the rough-cutting fixed knife 2. The first elastic member 7 is a spring, and its two ends are respectively sleeved on the outside of the spring column 512 and the positioning column 25, and press against the movable knife seat 51 and the rough-cutting fixed knife 2 so that each movable blade 52 is respectively fitted with the inner surface of the fine-cutting fixed knife 4, and can be vertically displaced up and down under the action of external force.

[0045] Based on the above embodiments, the applicant also proposes a technical solution for a razor, comprising a cutter head assembly as described in any one of the above embodiments.

[0046] The above embodiments should not be regarded as limiting the present invention, but any improvements based on the spirit of the present invention should be within the scope of protection of the present invention.

Claims

1. A cutter head assembly, comprising a cutter head seat (1), wherein at least a rough shearing unit for cutting long hair short and a fine shearing unit for shaving short hair are installed in the cutter head seat (1), wherein the rough shearing unit comprises a rough shearing fixed knife (2) and a rough shearing movable knife (3), and the fine shearing unit comprises a fine shearing fixed knife (4) and a fine shearing movable knife (5); characterized in that A fixed tooth portion (21) is provided on at least one side of both sides of the rough shear fixed knife (2), and is installed in the knife head seat (1) so that the fixed tooth portion (21) is located at the edge of the knife head seat (1); the fine shear fixed knife (4) is located above the rough shear fixed knife (2) and is connected to the knife head seat (1); the fine shear movable knife (5) is driven by the swinging member (6) to swing back and forth and is placed between the fine shear fixed knife (4) and the rough shear fixed knife (2); the first elastic member (7) presses the fine shear movable knife (5) and the rough shear fixed knife (2) respectively, and uses the rough shear fixed knife (2) as a reference to make the fine shear movable knife (5) swing back and forth. The knife (5) always keeps contact with the fine shearing fixed knife (4) and can move up and down along the axial direction of the fine shearing fixed knife (4) under the action of external force; the rough shearing movable knife (3) is placed below the rough shearing fixed knife (2) and is pressed by the second elastic member (8) so that the movable tooth portion (31) and the fixed tooth portion (21) of the rough shearing movable knife (3) always keep the end faces in contact with each other, and the rough shearing movable knife (3) can swing back and forth along the rough shearing fixed knife (2) under the drive of the swing member (6); the second elastic member (8) is detachably connected to the knife head seat (1) and is located below the rough shearing movable knife (3).

2. The cutter head assembly according to claim 1, characterized in that A through-going fixed knife hole (22) and a through-going movable knife hole (32) are respectively provided on the rough shearing fixed knife (2) and the rough shearing movable knife (3); one end of the swinging member (6) is placed in the fixed knife hole (22) and the movable knife hole (32), and the other end is linked to an external driving device; a first connecting member is provided on the swinging member (6) for connecting the fine shearing movable knife (5), so that the fine shearing movable knife (5) and the swinging member (6) are synchronously linked and can move up and down along the axial direction of the swinging member (6) after being subjected to force; and a second connecting member is provided for connecting the rough shearing movable knife (3), so that the rough shearing movable knife (3) and the swinging member (6) are synchronously linked.

3. The cutter head assembly according to claim 2, characterized in that The first connecting member is a first clamping platform (61) with an inclined surface, which is arranged on the opposite side wall of the swinging member (6) perpendicular to the swinging direction. A first clamping groove (511) with a height greater than that of the first clamping platform (61) is provided in the fine shearing movable knife (5). The first clamping platform (61) is clamped into the first clamping groove (511) so that the fine shearing movable knife (5) and the swinging member (6) are synchronously linked. After the fine shearing movable knife (5) is subjected to force, the first clamping platform (61) can be displaced up and down along the axial direction of the first clamping groove (511). The second connecting member is a limit block (62) with an insertion hole (63) arranged on the two end side walls corresponding to the swinging direction of the swinging member (6). A bending hook (33) is provided on the hole wall opposite to the movable knife hole (32) of the rough shearing movable knife (3). The bending hook (33) is inserted into the insertion hole (63) of the limit block (62) so that the rough shearing movable knife (3) and the swinging member (6) are synchronously linked.

4. The cutter head assembly according to claim 1, characterized in that The cross-sections of the rough shearing fixed knife (2) and the rough shearing movable knife (3) are both U-shaped, and the fixed tooth portion (21) and the movable tooth portion (31) on the rough shearing movable knife (3) are respectively arranged at the ends of the two side walls of the U-shape and extend outward; the U-shaped width and height of the rough shearing movable knife (3) are greater than the corresponding U-shaped width and height of the rough shearing fixed knife (2); a guide hole (23) is provided at the U-shaped bottom of the rough shearing fixed knife (2), and a bent guide piece (34) is provided at the U-shaped bottom of the rough shearing movable knife (3) and is inserted into the guide hole (23).

5. The cutter head assembly according to claim 1, characterized in that The fixed tooth portion (21) of the rough shear fixed knife (2) is provided with a plurality of cutting teeth (211) arranged at intervals, the tooth tip of each cutting tooth (211) is inclined relative to the end face of the fixed tooth portion (21), and a tooth protrusion (213) is provided on at least one of the upper and lower surfaces of the tooth tip of each cutting tooth (211), and the tooth protrusion (213) is semicircular so that the tooth tip surface of each cutting tooth (211) is in an arc shape.

6. The cutter head assembly according to claim 1, characterized in that The cutter head seat (1) comprises end plates (11) whose length is limited at the left and right ends, and side plates (12) for connecting the two end plates (11); a tongue plate (13) is provided on each end plate (11), and a second clamping platform (14) with an inclined surface is provided on the inner side surface of each tongue plate (13); the two end surfaces of the U-shaped bottom plate of the rough shear fixed knife (2) are respectively fitted with the end surfaces of the side plates (12) and the second clamping platform (14), so that the rough shear fixed knife (2) is detachably fixed to the cutter head seat (1).

7. The cutter head assembly according to claim 6, characterized in that A limiting piece (16) is provided on both sides of the latch plate (13) on the inner side surface of each end plate (11); an open second clamping groove (24) is provided at both ends of the U-shaped bottom plate of the rough shearing fixed knife (2); the second clamping groove (24) is respectively clamped into the outside of the limiting piece (16) so that the rough shearing fixed knife (2) and the cutter head seat (1) form a longitudinal limit; a third clamping platform (17) with an inclined surface is provided at the end of each limiting piece (16); an open third clamping groove (81) and a spring tongue piece (82) are respectively provided at both ends of the second elastic member (8); the third clamping groove (81) is clamped into the outside of the third clamping platform (17); each spring tongue piece (82) is pressed against the end face of the rough shearing movable knife (3) so that the end face of the third clamping platform (17) fits with the end face of the second elastic member (8), and the second elastic member (8) is detachably fixed in the cutter head seat (1).

8. The cutter head assembly according to claim 6, characterized in that A plurality of spaced and through-going square holes (18) are provided on a side plate (12) connected to an end plate (11) in a cutter head seat (1), and at least one insert plate (19) whose length is less than the height of the square hole (18) is provided on the upper side wall of each square hole (18); the fine shearing movable knife (5) is a thin sheet with a thickness less than 0.2 mm, and a number of mounting holes (41) equal to the number of the insert plates (19) are provided on both sides of the fine shearing movable knife (5), and each mounting hole (41) is respectively sleeved on the outside of the insert plates (19) so that the fine shearing movable knife (5) can be detachably mounted in the cutter head seat (1).

9. The cutter head assembly according to claim 3, characterized in that The fine shearing movable knife (5) comprises a plurality of movable blades (52), each movable blade (52) is arranged at intervals on the movable knife seat (51) and is integrally injection-molded with the movable knife seat (51); a first clamping groove (511) of the fine shearing movable knife (5) is arranged in the movable knife seat (51); spring columns (512) are respectively provided at both ends of the bottom of the movable knife seat (51), and a positioning column (25) protruding from the surface is provided on the U-shaped bottom plate of the rough shearing fixed knife (2); a first elastic member (7) is a spring, and its two ends are respectively sleeved on the outside of the spring column (512) and the positioning column (25), and press against the movable knife seat (51) and the rough shearing fixed knife (2) so that each movable blade (52) is respectively fitted with the inner surface of the fine shearing fixed knife (4), and can be vertically displaced up and down under the action of external force.

10. A razor, characterized in that A cutter head assembly comprising any one of claims 1 to 9.

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