Intermediate cutter set capable of preventing tooth clamping

Abstract

The utility model relates to a middle cutter set capable of preventing tooth clamping, which comprises a static cutter and a moving cutter, and the moving cutter is always attached to the static cutter under the action of external force and can swing back and forth along the static cutter. The cutter is characterized in that each moving cutter tooth in the moving cutter is inclined relative to each static cutter tooth in the static cutter, and when the moving cutter is located at any reciprocating swing position, at least one end of each moving cutter tooth is in local surface contact with the corresponding static cutter tooth in the static cutter. The utility model has the beneficial effects that the movable cutter teeth and the static cutter teeth are inclined, so that when the movable cutter is at any reciprocating swinging position, the static cutter teeth can axially press and limit at least one end of the movable cutter teeth in any state, which is vertical to the swinging direction of the movable cutter; the movable cutter teeth can be effectively prevented from being clamped into the static tooth grooves in the static cutter when the static cutter is stressed, bent and deformed due to the limitation of surface contact formed by the static cutter teeth on the ends pressed by the movable cutter teeth, so that the tooth clamping phenomenon is avoided, and the operation stability of the movable cutter and the trimming performance of hairs such as beards are improved.

Description

Technical Field

[0001] This utility model relates to a blade assembly for trimming hair such as beards, and more specifically to a middle blade assembly for preventing tooth jamming, mainly used in the field of personal care tools such as razors and hair trimmers. Background Technology

[0002] The intermediate blade assembly is an important trimming component in multi-blade trimming tools, mainly used for trimming long hairs such as beards, shortening them. Existing intermediate blade assemblies mainly consist of a stationary blade 1 and a moving blade 2. The stationary blade 1 is mounted on a stationary blade holder, and the moving blade 2 is mounted on a moving blade holder. Each of the stationary blade 1 and moving blade 2 has several spaced-apart stationary blade teeth 11 and moving blade teeth 21, respectively. Adjacent stationary blade teeth 11 and moving blade teeth 21 form stationary tooth grooves 3. Furthermore, under the action of an elastic element, the outer surface of the moving blade 2 always remains in contact with the inner surface of the stationary blade 1, ensuring sufficient shearing force between the stationary blade teeth 11 and moving blade teeth 21 to cut beards and other hairs.

[0003] like Figure 1 and 2 As shown, the stationary blade teeth 11 in the existing stationary blade 1 and the moving blade teeth 21 on the moving blade 2 are relatively parallel. When trimming hair, the cutting edge of the moving blade teeth 21 can contact the cutting edge of the stationary blade teeth 11 in one go, maintaining the largest cutting surface and increasing the amount of hair trimmed by the moving blade teeth 21 in one go.

[0004] However, this structure also has obvious drawbacks. For example, when trimming hair such as beards, the stationary blade 1 will be in close contact with the skin. When the user manually presses the trimming tool, the stationary blade 1 will bend and deform under the pressure applied by the hand. At this time, the lower opening of the stationary tooth groove 3 in the stationary blade 1 will be pushed open to both sides. If the moving blade tooth 21 in the moving blade 2 happens to be located at the stationary tooth groove 3 in the stationary blade 1, it is very easy to get stuck in the stationary tooth groove 3 in the stationary blade 1 at the moment when the stationary blade 1 is bent and deformed by force, resulting in tooth jamming.

[0005] Secondly, the moving blade 2 is supported by the elastic force of the elastic element and always keeps in contact with the stationary blade 1. During the reciprocating swing of the moving blade 2 along the stationary blade 1, it is prone to a warping phenomenon at both ends of the moving blade 2 due to the obstruction of hair such as beard (i.e. before the hair is cut off between the stationary blade tooth 11 and the moving blade tooth 21). That is, one end of the moving blade 2 tilts downward and the other end tilts upward. At this time, the moving blade tooth 21 at the tilted end is very likely to get stuck in the stationary tooth groove 3 in the stationary blade 1, resulting in tooth jamming and damage to the intermediate blade group or hair trimming tool. Utility Model Content

[0006] To solve the above technical problems, this utility model provides an intermediate blade assembly to prevent tooth jamming. By adjusting the direction of the moving blade teeth, the moving blade teeth are pressed against the stationary blade teeth in any position. This effectively prevents the moving blade teeth from getting stuck in the stationary tooth groove of the stationary blade, ensuring the trimming performance of beards and other hairs, and improving the safety of using the trimming tool.

[0007] To solve the above technical problems, the present invention provides an intermediate blade assembly for preventing tooth jamming, comprising a stationary blade with a plurality of spaced-apart stationary blade teeth, wherein adjacent stationary blade teeth form stationary tooth grooves; and a movable blade with a plurality of spaced-apart movable blade teeth, wherein adjacent movable blade teeth form movable tooth grooves; furthermore, the movable blade remains in contact with the stationary blade under external force and can reciprocate along the stationary blade; each movable blade tooth in the movable blade is inclined relative to the stationary blade teeth in the stationary blade, and when the movable blade is in any reciprocating swing position, at least one end of each movable blade tooth forms a partial surface contact with the corresponding stationary blade tooth in the stationary blade.

[0008] Preferably, in the stationary cutter, each stationary cutter tooth is perpendicular or inclined to the two sides of the stationary cutter, and in the moving cutter, each moving cutter tooth is inclined to the stationary cutter teeth, with an inclination angle α of 15° to 25°. When the moving cutter is in any reciprocating swing position, one end of any moving cutter tooth forms a surface contact with one of the stationary cutter teeth in the stationary cutter, and the other end of the same moving cutter tooth forms a surface contact with the opposite end of another adjacent stationary cutter tooth in the stationary cutter, so that two adjacent stationary cutter teeth in the stationary cutter respectively form axial limits perpendicular to the swing direction at both ends of the same moving cutter tooth in the moving cutter.

[0009] Preferably, each stationary cutter tooth includes a first tooth segment and a second tooth segment, as well as a transition tooth segment for connecting the first tooth segment and the second tooth segment, wherein the first tooth segment and the second tooth segment are parallel and offset from each other; each moving cutter tooth in the moving cutter is inclined relative to the first tooth segment and the second tooth segment; the transition tooth segment is S-shaped, with the width at both ends being greater than the width in the middle, so that the width in the middle of the stationary tooth groove between adjacent stationary cutter teeth is greater than the width at both ends.

[0010] Preferably, the ends of the first and second tooth segments that are in contact with the outside are tapered, so that a flared opening is formed at the opening of the stationary tooth groove between adjacent stationary cutter teeth.

[0011] Preferably, the cutting edges on both sides of each moving tooth in the moving cutter are in an outward-protruding arc shape, so that the width at both ends of the moving tooth is smaller than the width in the middle.

[0012] Preferably, the cutting edges on both sides of each moving tooth in the moving cutter are in an inwardly concave arc shape, so that the width at both ends of the moving tooth is greater than the width in the middle.

[0013] Preferably, each moving tooth in the moving cutter includes a connecting end connecting the two side walls of the moving cutter and an arc-shaped segment placed between the two connecting ends, wherein the arc-shaped segment is concave inward or protrudes outward, such that the width of the arc-shaped segment is greater than or less than the width of the connecting end.

[0014] Preferably, a number of spaced stationary cutter teeth and stationary tooth grooves between adjacent stationary cutter teeth constitute a tooth groove group, wherein the length of the tooth groove group is less than the length of the stationary cutter, so that reinforcing plates are formed at both ends of the stationary cutter; connecting ribs are provided in at least two stationary tooth grooves near the reinforcing plates in the stationary cutter to divide the stationary tooth grooves into two parts, and the connecting ribs connect the stationary cutter teeth on both sides of the stationary tooth grooves in sequence to connect them with the reinforcing plates as a whole.

[0015] Preferably, when viewed from the orthographic projection direction of either end of the stationary tool, the surface of the stationary tool is either planar or non-planar.

[0016] The beneficial effect of this utility model is that the moving blade and the stationary blade are set at an inclination. In this way, when the moving blade is in any reciprocating swing position, the stationary blade can form an axial pressing limit on at least one end of the moving blade perpendicular to the swing direction of the moving blade in any state. The end pressed by the stationary blade against the moving blade forms a surface contact restriction, which can effectively prevent the moving blade from getting stuck in the stationary tooth groove of the stationary blade when the stationary blade is bent and deformed by force, thereby avoiding the phenomenon of tooth jamming, improving the running stability of the moving blade and the trimming performance of hair such as beard. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the stationary and moving tools of an existing intermediate tool set as described in the background art.

[0018] Figure 2 This is a simulated diagram illustrating how a static knife can become stuck due to skin compression and bending, as described in the background art.

[0019] Figure 3 This is a three-dimensional structural diagram of the intermediate blade assembly for preventing tooth jamming according to an embodiment of the present invention.

[0020] Figure 4 This is a three-dimensional sectional view of the intermediate blade assembly for preventing tooth jamming according to an embodiment of the present invention.

[0021] Figure 5 This is a front view of the stationary blade in an embodiment of the present invention.

[0022] Figure 6 These are three embodiments of the stationary blade shape in this utility model.

[0023] Figure 7 A schematic diagram of the first embodiment of the cooperation between the stationary cutter tooth and the moving cutter tooth in this utility model.

[0024] Figure 8 This is a schematic diagram of the second embodiment of the cooperation between the stationary cutter teeth and the moving cutter teeth in this utility model.

[0025] Figure 9 This is a front view of the moving blade in an embodiment of the present invention.

[0026] Figure 10 This is a schematic diagram of the second embodiment of the moving cutter teeth in this utility model.

[0027] Figure 11 This is a schematic diagram of the third embodiment of the moving cutter teeth in this utility model.

[0028] Figure 12 This is a schematic diagram of the fourth embodiment of the moving cutter teeth in this utility model.

[0029] Figure 13 This is an exploded structural diagram of the intermediate blade assembly for preventing tooth jamming according to an embodiment of the present invention. Detailed Implementation

[0030] The following is in conjunction with the appendix Figures 3-13 The embodiments of this utility model are further described below:

[0031] This utility model provides an intermediate blade assembly for preventing tooth jamming, including a stationary blade 4 mounted on a stationary blade seat 7. The stationary blade 4 has several spaced-apart stationary blade teeth 41, with stationary tooth grooves 42 formed between adjacent stationary blade teeth 41 for guiding hair such as beard hair. It also includes a movable blade 5 mounted on a movable blade seat 6, which is linked to a drive mechanism (not shown in the figure). Driven by the drive mechanism, the movable blade 5 reciprocates along the stationary blade 4. To facilitate the insertion of hair into the stationary tooth grooves 42... The beard and other hairs are cut off. The moving blade 5 has several spaced moving blade teeth 51, and a moving tooth groove 52 is formed between adjacent moving blade teeth 51. In order to generate a shearing force between the moving blade teeth 51 and the stationary blade teeth 41, an elastic member 8 is provided below the moving blade 5 or the moving blade seat 6. The elastic member 8 supports the bottom of the moving blade seat 6 or the moving blade 5 so that the outer surface of the moving blade teeth 51 always keeps in contact with the inner surface of the stationary blade teeth 41, thereby generating a shearing force between the stationary blade teeth 41 and the moving blade teeth 51 to cut off the beard and other hairs that extend into the stationary tooth groove 42.

[0032] To prevent the moving teeth 51 in the moving cutter 5 from getting stuck in the stationary tooth groove 42 in the stationary cutter 4, causing a tooth jamming phenomenon, each moving tooth 51 in the moving cutter 5 is inclined relative to each stationary tooth 41 in the stationary cutter 4. When the moving cutter 5 is in any reciprocating swing position, at least one end of each moving tooth 51 forms a partial surface contact with the corresponding stationary tooth 41 in the stationary cutter 4, so that the stationary tooth 41 forms an axial limit perpendicular to the swing direction for at least one end of the moving tooth 51 in any state. By setting the moving cutter tooth 51 and the stationary cutter tooth 41 at an angle, when the moving cutter 5 is in any reciprocating swing position, the stationary cutter tooth 41 can axially press and limit at least one end of the moving cutter tooth 51 perpendicular to the swing direction of the moving cutter 5. The end pressed by the stationary cutter tooth 41 forms a surface contact restriction, which effectively prevents the moving cutter tooth 51 from getting stuck in the stationary tooth groove 42 of the stationary cutter 4 when the stationary cutter 4 is bent and deformed by force, thereby avoiding tooth jamming, improving the running stability and safety of the moving cutter 5, and increasing the service life of the intermediate cutter group. Secondly, setting the stationary cutter tooth 41 and the moving cutter tooth 51 at an angle not only prevents the moving cutter tooth 51 from getting stuck in the stationary tooth groove 42 of the stationary cutter 4, but also adjusts the cutting angle between the moving cutter tooth 51 and the stationary cutter tooth 41, improving the cutting sharpness of the moving cutter tooth 51.

[0033] like Figure 8 As shown, in actual production, the stationary cutter teeth 41 in the stationary cutter 4 can be perpendicular or inclined relative to the side wall of the stationary cutter 4. It is only necessary to ensure that the moving cutter teeth 51 and the stationary cutter teeth 41 form an inclination angle α, and ensure that the inclination angle α is within the range of 4° > α ≥ 45°, preferably between 15° and 25°. In this way, when the moving cutter 5 is in any reciprocating swing position, one end of any moving cutter tooth 51 forms a surface contact with one of the stationary cutter teeth 41 in the stationary cutter 4, and the other end of the same moving cutter tooth 51 forms a surface contact with the opposite end of another adjacent stationary cutter tooth 41 in the stationary cutter 4. This allows two adjacent stationary cutter teeth 41 in the stationary cutter 4 to form axial limits perpendicular to the swing direction at both ends of the same moving cutter tooth 51 in the moving cutter 5. By utilizing the two adjacent stationary blade teeth 41 in the stationary blade 4 to form surface contact with the two ends of the same moving blade tooth 51, when the stationary blade 4 is bent and deformed by force, the two stationary blade teeth 41 can press the two ends of the moving blade tooth 51 to form axial limit, effectively preventing the moving blade tooth 51 from getting stuck in the stationary tooth groove 42 in the stationary blade 4, improving the operational stability and safety of the intermediate blade group, and ensuring the trimming performance of the intermediate blade group for beards and other hairs.

[0034] In actual production, the inclination angle α between the moving cutter tooth 51 and the stationary cutter tooth 41 can be determined based on the width of each stationary cutter tooth 41 or the width of the stationary tooth groove 42 in the stationary cutter 4. For example, if the width of the stationary cutter tooth 41 or the stationary tooth groove 42 is relatively large, the value of the inclination angle α can be increased; conversely, if the width of the stationary cutter tooth 41 or the stationary tooth groove 42 is relatively small, the value of the inclination angle α can be decreased. The relative width mentioned in this embodiment refers to the width value of the stationary cutter tooth 41 or the stationary tooth groove 42 commonly used in the existing industry. The specific width value is not described in detail here.

[0035] Unlike the aforementioned inclined or vertical stationary cutter teeth 41 technical solutions, this embodiment also proposes another technical solution for the stationary cutter teeth 41, such as... Figure 5 and 7 As shown, each stationary cutter tooth 41 includes a first tooth segment 411 and a second tooth segment 412, and a transition tooth segment 413 for connecting the first tooth segment 411 and the second tooth segment 412. The first tooth segment 411 and the second tooth segment 412 are parallel and offset from each other. Each moving cutter tooth 51 in the moving cutter 5 is inclined relative to the first tooth segment 411 and the second tooth segment 412, and the inclination angle a is: 4° > a ≥ 25°. When the moving cutter 5 is in any reciprocating swing position, one end of any moving cutter tooth 51 forms a surface contact with the first tooth segment 411 of one of the stationary cutter teeth 41 in the stationary cutter 4, and the other end of the same moving cutter tooth 51 forms a surface contact with the second tooth segment 412 of another adjacent stationary cutter tooth 41 in the stationary cutter 4. This makes the first tooth segment 411 and the second tooth segment 412 of two adjacent stationary cutter teeth 41 in the stationary cutter 4 respectively form axial limits perpendicular to the swing direction at both ends of the same moving cutter tooth 51 in the moving cutter 5. The stationary blade tooth 41 is designed as an irregular segmented structure, formed by a first tooth segment 411, a transition tooth segment 413, and a second tooth segment 412. This allows the two ends of the same moving blade tooth 51 to form surface contact with the first tooth segment 411 and the second tooth segment 412 of the adjacent stationary blade tooth 41, respectively, in any state or position of the moving blade 5. This allows the opposite ends of two adjacent stationary blade teeth 41 in the stationary blade 4 to press against the two ends of the same moving blade tooth 51, forming an axial limit. This effectively prevents the moving blade tooth 51 from getting stuck in the stationary tooth groove 42 in the stationary blade 4, improving the operational stability and safety of the intermediate blade group, and ensuring the trimming performance of the intermediate blade group for beards and other hairs.

[0036] Secondly, the interlocking first tooth segment 411 and second tooth segment 412 not only increase the length of the stationary tooth groove 42, but also prolong the time for the hair such as beard to slide out of the stationary tooth groove 42 after entering it, thus giving the moving blade tooth 51 more time to reciprocate and cut, increasing the amount of hair such as beard trimmed by a single moving blade tooth 51 in a single swing process, and improving the hair trimming efficiency of the moving blade 5.

[0037] Meanwhile, since the first tooth segment 411 and the second tooth segment 412 are misaligned, no matter which end of the stationary tooth groove 42 the hair enters, the connection between the misaligned first tooth segment 411 and the second tooth segment 412 can play a role in delaying and blocking, thus blocking or delaying the sliding of the hair and maximizing the amount of hair trimmed by the single moving blade tooth 51 in a single swing.

[0038] like Figure 5 and 7 As shown, to prevent fraying at the misalignment of the first tooth segment 411 and the second tooth segment 412, the transition tooth segment 413 is S-shaped, with the width L1 at both ends being greater than the width L2 in the middle. This makes the width L3 in the middle of the stationary tooth groove 42 between adjacent stationary cutter teeth 41 greater than the width L4 at both ends. By making the transition tooth segment 413 S-shaped and using different width settings, not only can the length of the stationary tooth groove 42 be increased, but the change in width can also delay the time for hairs such as beards to slide out of the stationary tooth groove 42, allowing the reciprocating oscillation of the moving cutter teeth 51 to gain cutting time and increase the amount of hair cut by the moving cutter teeth 51 in a single oscillation. At the same time, the smooth S-shape also allows hairs such as beards to slide smoothly in the stationary tooth groove 42, preventing hairs such as beards from getting stuck at a certain position between the transition tooth segment 413 and the first tooth segment 411 or the second tooth segment 412, causing fraying. Of course, the transition tooth segment 413 may not be S-shaped. For example, it can be directly connected to the first tooth segment 411 and the second tooth segment 412 through a horizontal or inclined line segment. However, using a horizontal or inclined line segment may not be conducive to the smooth sliding of hair such as beards in the stationary tooth groove 42. Therefore, adopting an S-shape for the transition tooth segment 413 is the preferred embodiment.

[0039] like Figure 5 , 7 As shown in Figure 8, to facilitate smoother entry of hair such as beards into the stationary tooth groove 42 of the stationary blade 4, the ends of the first tooth segment 411 and the second tooth segment 412 that contact the outside are tapered, forming a flared opening 43 at the opening of the stationary tooth groove 42 between adjacent stationary blade teeth 41. By setting the ends of the first tooth segment 411 and the second tooth segment 412 that contact the outside to be tapered, the opening of the stationary tooth groove 42 between two adjacent stationary blade teeth 41 is formed into a flared opening 43 that is wider on the outside and narrower on the inside, thus making it easier for hair such as beards to enter the stationary tooth groove 42 from both ends, improving the hair entry efficiency of the stationary tooth groove 42.

[0040] like Figure 9As shown, to improve the cutting sharpness and working strength of the moving blades 51, the cutting edges of each moving blade 51 are arranged in an outward-protruding arc shape, making the width L5 at both ends of the moving blade 51 smaller than the width L6 in the middle. By setting the cutting edges of the moving blades 51 to an outward-protruding arc shape, the angle between them and the cutting edges of the stationary blades 41 forms an acute angle, resulting in higher cutting sharpness and effectively improving the hair trimming efficiency of the moving blades 51. Secondly, because the cutting edges of the moving blades 51 are arranged in an outward-protruding arc shape, the width L6 in the middle area of ​​the moving blades 51 is relatively increased to be greater than the width L5 at both ends, thereby improving the overall working strength of the moving blades 51 and preventing the moving blades 51 from twisting when there is a lot of beard or hair, which would affect the hair trimming performance of the middle blade group.

[0041] Unlike the aforementioned arc-shaped technical solution where the cutting edges of the moving tooth 51 protrude outwards on both sides, this embodiment also proposes another implementation method, such as... Figure 10 As shown, the cutting edges of each moving blade 51 in the moving blade 5 are concave arc-shaped on both sides, making the width L7 at both ends of the moving blade 51 greater than the width L8 in the middle. Although setting the cutting edges of the moving blade 51 to be concave arc-shaped on both sides reduces the width L8 in the middle area of ​​the moving blade 51 and may reduce the working strength, the working strength of the moving blade 51 can still be guaranteed by using materials with different hardness. Furthermore, the concave cutting edges of the moving blade 51, when the hair to be cut enters the concave cutting edge of the moving blade 51, cooperates with the cutting edge of the stationary blade 41 to gather and surround the hair, preventing the hair to be cut from escaping from the area surrounded by the cutting edges of the moving blade 51 and the stationary blade 41. This increases the amount of hair trimmed by a single tooth of the moving blade 51, improving the hair trimming efficiency and performance.

[0042] Based on the above two embodiments of the moving cutter tooth 51, the applicant has also proposed two other implementation methods, such as... Figure 11 As shown in Figure 12, the moving blade tooth 51 has a three-section structure, including a connecting end connecting the two side walls of the moving blade 5, and an arc-shaped section placed between the two connecting ends. The arc-shaped section is concave inward or protruding outward, such that the widths L9 and L10 of the arc-shaped section are greater than or less than the widths L11 and L12 of the connecting ends. This three-section structure, while ensuring the connection strength between the two ends of the moving blade tooth 51 and the two side walls of the moving blade 5, also allows for adjustment of the cutting angle between the cutting edge of the moving blade tooth 51 and the cutting edge of the stationary blade tooth 41. This improves the cutting sharpness of the moving blade tooth 51 while also gathering and enclosing hairs such as beard hairs.

[0043] Since the moving blade 5 is kept in contact with the stationary blade 4 under the action of the elastic element 8, when hair such as beard enters the stationary tooth groove 42 in the stationary blade 4, the moving blade 5 will be affected by the hair such as beard, and the two ends of the moving blade 5 will form a seesaw phenomenon, that is, the two ends of the moving blade 5 will alternately lift up, so that the moving blade teeth 51 at both ends of the moving blade 5 will form an axial tilt relative to the stationary tooth groove 42 of the stationary blade 4, which can easily cause the moving blade teeth 51 to be inserted into or stuck in the stationary tooth groove 42, causing tooth jamming. To prevent tooth jamming in the event of a tilting phenomenon, a number of spaced stationary cutter teeth 41 and stationary tooth grooves 42 between adjacent stationary cutter teeth 41 constitute a tooth groove group. The length L13 of the tooth groove group is less than the length L14 of the stationary cutter, resulting in reinforcing plates 44 at both ends of the stationary cutter 4. Connecting ribs 45 are provided in at least two stationary tooth grooves 42 near the reinforcing plates 44, dividing the stationary tooth groove 42 in two. The connecting ribs 45 sequentially connect the stationary cutter teeth 41 on both sides of the stationary tooth groove 42 to the reinforcing plates 44, forming a single unit. By controlling the length of the tooth groove group, reinforcing plates 44 are formed at both ends of the stationary cutter 4, thus improving the working strength of the stationary cutter 4 during operation and minimizing the risk of bending deformation. In the tooth groove assembly, connecting ribs 45 are added to at least two stationary tooth grooves 42 at both ends, and the bottom end face of the connecting rib 45 is made coplanar with the bottom end face of the stationary cutter tooth 41. When the moving cutter 5 swings back and forth along the inner surface of the stationary cutter 4 and a rocking phenomenon occurs, the outermost moving cutter tooth 51 at both ends of the moving cutter 5 can be blocked by the stationary cutter tooth 41 and the connecting rib 45, forming an axial limit perpendicular to the swing direction. The moving cutter tooth 51 cannot be inserted or stuck into the stationary tooth groove 42, ensuring the continuity of the reciprocating swing of the moving cutter 5 and the trimming performance of hair such as beards. In actual production, the number of connecting ribs 45 can be set according to the reciprocating swing stroke distance of the moving cutter 5. If the swing stroke is large, connecting ribs 45 can be set in three or four stationary tooth grooves 42 at both ends of the tooth groove assembly, as long as connecting ribs 45 are provided in the stationary tooth grooves 42 above the outermost moving cutter tooth 51 at both ends during the swing of the moving cutter 5. When the reciprocating swing stroke of the moving cutter 5 is short, connecting ribs 45 can be added to the two stationary tooth grooves 42 at both ends of the tooth groove group.

[0044] In some specific embodiments, different static knife 4 structures can be selected according to user needs, such as... Figure 6As shown in the three embodiments, the surface of the stationary blade 4 can be planar or non-planar when viewed from the orthographic projection direction of either end. If a planar shape is used, although the skin feel is relatively poor when the stationary blade 4 is in contact with the skin, it is easier to manufacture and has higher production efficiency. Therefore, a planar stationary blade 4 is preferred unless the user has special requirements. Of course, in addition to a planar stationary blade 4, an outwardly protruding arc-shaped surface can also be selected. With this structure, the skin feel is better when the stationary blade 4 is in contact with the skin, and the relatively lower sides of the stationary blade 4 make it easier for hairs such as beards to enter the stationary tooth groove 42 from the sides of the stationary blade 4, improving the hair-feeding efficiency of the stationary blade 4. Secondly, according to user needs, an inwardly concave arc shape can also be selected, with the sides of the stationary blade 4 protruding more, which can act as a shovel. That is, when the stationary blade 4 slides along the skin, the protruding parts on both sides of the stationary blade 4 can shovel up the hairs such as beards that are in contact with the skin surface, improving the hair-feeding efficiency of the middle blade assembly and the hair trimming effect. In actual production, this embodiment does not impose further restrictions on the specific static knife 4 structure used.

[0045] The above embodiments should not be regarded 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. An intermediate blade assembly for preventing tooth jamming, comprising a stationary blade (4) having a plurality of spaced-apart stationary blade teeth (41) on the stationary blade (4), with stationary tooth grooves (42) formed between adjacent stationary blade teeth (41); and a movable blade (5) having a plurality of spaced-apart movable blade teeth (51) on the movable blade (5), with movable tooth grooves (52) formed between adjacent movable blade teeth (51); and wherein the movable blade (5) remains in contact with the stationary blade (4) under external force and can reciprocate along the stationary blade (4); characterized in that Each moving tooth (51) in the moving cutter (5) is inclined relative to each stationary tooth (41) in the stationary cutter (4). When the moving cutter (5) is in any reciprocating swing position, at least one end of each moving tooth (51) forms a partial surface contact with the corresponding stationary tooth (41) in the stationary cutter (4), so that the stationary tooth (41) forms an axial limit perpendicular to the swing direction for at least one end of the moving tooth (51) in any state.

2. The intermediate blade assembly for preventing tooth jamming according to claim 1, characterized in that... In the stationary cutter (4), each stationary cutter tooth (41) is perpendicular or inclined to the two sides of the stationary cutter (4), and in the moving cutter (5), each moving cutter tooth (51) is inclined to the stationary cutter tooth (41), with an inclination angle a of 15° to 25°. When the moving cutter (5) is in any reciprocating swing position, one end of any moving cutter tooth (51) forms a surface contact with one of the stationary cutter teeth (41) in the stationary cutter (4), and the other end of the same moving cutter tooth (51) forms a surface contact with the opposite end of another adjacent stationary cutter tooth (41) in the stationary cutter (4), so that the two adjacent stationary cutter teeth (41) in the stationary cutter (4) respectively form an axial limit perpendicular to the swing direction at both ends of the same moving cutter tooth (51) in the moving cutter (5).

3. The intermediate blade assembly for preventing tooth jamming according to claim 1, characterized in that... Each stationary cutter tooth (41) includes a first tooth segment (411) and a second tooth segment (412), and a transition tooth segment (413) for connecting the first tooth segment (411) and the second tooth segment (412). The first tooth segment (411) and the second tooth segment (412) are parallel and offset from each other. Each moving cutter tooth (51) in the moving cutter (5) is inclined relative to the first tooth segment (411) and the second tooth segment (412). The transition tooth segment (413) is S-shaped, with the width L1 at both ends being greater than the width L2 in the middle, so that the width L3 in the middle of the stationary tooth groove (42) between adjacent stationary cutter teeth (41) is greater than the width L4 at both ends.

4. The intermediate blade assembly for preventing tooth jamming according to claim 3, characterized in that... The first tooth segment (411) and the second tooth segment (412) are tapered at the end that contacts the outside, so that a flared mouth (43) is formed at the opening of the stationary tooth groove (42) between adjacent stationary cutter teeth (41).

5. The intermediate blade assembly for preventing tooth jamming according to claim 1, characterized in that... The cutting edges of each moving tooth (51) in the moving cutter (5) are in an outward-protruding arc shape, so that the width L5 at both ends of the moving tooth (51) is smaller than the width L6 in the middle.

6. The intermediate blade assembly for preventing tooth jamming according to claim 1, characterized in that... The cutting edges of each moving tooth (51) in the moving cutter (5) are concave arc-shaped on both sides, so that the width L7 at both ends of the moving tooth (51) is greater than the width L8 in the middle.

7. The intermediate cutter assembly for preventing tooth jamming according to claim 1, characterized in that... Each moving cutter tooth (51) in the moving cutter (5) includes a connecting end that connects the two side walls of the moving cutter (5) and an arc-shaped segment placed between the two connecting ends. The arc-shaped segment is recessed inward or protrudes outward, such that the widths L9 and L10 of the arc-shaped segment are less than or greater than the widths L11 and L12 of the connecting ends.

8. The intermediate blade assembly for preventing tooth jamming according to claim 1, characterized in that... The stationary cutter (4) has several spaced stationary cutter teeth (41) and stationary tooth grooves (42) between adjacent stationary cutter teeth (41) forming a tooth groove group. The length L13 of the tooth groove group is less than the length L14 of the stationary cutter, so that reinforcing plates (44) are formed at both ends of the stationary cutter (4). In the stationary cutter (4), at least two stationary tooth grooves (42) near the reinforcing plates (44) are provided with connecting ribs (45) to divide the stationary tooth grooves (42) into two parts. Furthermore, the connecting ribs (45) connect the stationary cutter teeth (41) on both sides of the stationary tooth grooves (42) in sequence to the reinforcing plates (44) to form a whole.

9. The intermediate blade assembly for preventing tooth jamming according to claim 1, characterized in that... Viewed from either end of the stationary knife (4) via orthographic projection, the surface of the stationary knife (4) is either planar or non-planar.

Images