CN220162513U - Hair trimming cutter head capable of preventing hair from being clamped - Google Patents

Abstract

The utility model relates to a hair trimming cutter head for preventing hair clamping, which is characterized in that a static cutter comprises a fixed tooth part, a movable cutter comprises a movable tooth part, and the height H of the movable tooth part ₁ Is smaller than the height H of the fixed tooth part ₂ The tooth tips of the cutting teeth in the movable tooth part are overlapped with the edge of the upper end of the movable tooth part, when the movable tooth part is in contact with the end face of the fixed tooth part, the tooth tips of the cutting teeth in the movable tooth part are positioned below the tooth tips of the cutting teeth in the fixed tooth part, and the lower peaks of the outer side walls of the left end and the right end of the movable tooth part are positioned below the groove bottoms of at least one static tooth groove at the outermost sides of the two ends of the fixed tooth part. The utility model has the advantages that the height of the movable tooth part is increased, and the left and right movable tooth parts are respectively provided withThe lower top point of the end outer side wall is arranged below the groove bottom of at least one static tooth groove at the outermost side of the two ends of the fixed tooth part, the outer side wall at the two ends of the movable tooth part can push or cut off the hair entering the groove bottom of at least one static tooth groove at the outermost side of the two ends of the fixed tooth part to the outside of the two ends of the fixed tooth part, the phenomenon of napping or hair clamping of the trimming cutter head is avoided, the pain feeling caused by pulling is avoided, and the use comfort of the trimming cutter head is improved.

Description

Hair trimming cutter head capable of preventing hair from being clamped

Technical Field

The utility model relates to a hair trimming device, in particular to a hair trimming cutter head capable of preventing hair from being clamped, which is mainly applied to tools such as hair trimmers, shavers or shavers.

Background

The trimming cutter head is a main component of a hair trimming cutter, a shaver or a shaver and mainly comprises a static cutter and a movable cutter, wherein the static cutter and the movable cutter are respectively provided with a plurality of cutting teeth which are arranged at intervals, and the movable cutter is driven by a driving mechanism to reciprocate along the static cutter to cut hairs such as beard by utilizing the cooperation of the cutting teeth. Because the length of each cutting tooth on the static knife applied to the hair clipper is longer than that of the cutting tooth of the movable knife, the depth of the static tooth slot between two adjacent cutting teeth on the static knife is relatively deeper, and the static tooth slot with deeper depth on the static knife can quickly separate hairs to be cut and has more hair feeding amount in the hair clipper cutting process, so that the hair clipping benefit can be effectively improved.

Although the length of each cutting tooth on the static cutter is lengthened, the static tooth slot depth between two adjacent cutting teeth can be increased to improve single-time hair feeding quantity, the cutting teeth of the movable cutter of the existing trimming cutter head are shorter than those of the static cutter, and therefore when the movable cutter is assembled with the end face of the static cutter in a fitting way, the bottom of the movable tooth slot between the two adjacent cutting teeth on the movable cutter is positioned above the static tooth slot on the static cutter. In the working process of the trimming cutter head, the hair entering the bottom of the static tooth slot, especially the hair entering the bottom of the static tooth slot at the edge of the two ends of the left and right of the static cutter are matched with the cutting edge of the cutting tooth at the edge of the two ends of the left and right of the movable cutter, the hair is not easy to be sheared, even the hair is easy to be pushed between the movable cutter and the static cutter due to the reciprocating swing of the driven cutter, the phenomena of hair pulling or hair clamping are caused, the skin of a customer is enabled to produce the pain with the pulling property to cause uncomfortable feeling, and the use comfort of the trimming cutter head is reduced.

Disclosure of Invention

In order to solve the above technical problems; the utility model provides a hair trimming cutter head capable of preventing hair from being clamped, which can effectively prevent hair from being cut easily due to too deep static tooth grooves at the edges of the left side and the right side of a static cutter, and prevent the phenomenon of hair pulling or clamping from being caused by pushing a driven cutter between end faces of a movable cutter and the static cutter, and improves the use comfort of the hair trimming cutter head.

In order to solve the technical problems, the technical scheme adopted by the utility model is that the hair trimming cutter head for preventing hair from being clamped comprises a static cutter and a movable cutter, wherein the movable cutter can swing back and forth relative to the static cutter under the drive of external force; the static cutter comprises a tooth fixing part, a plurality of cutting teeth which are arranged at intervals are arranged in the tooth fixing part, and a static tooth slot with an opening is formed between every two adjacent cutting teeth;

the movable cutter comprises a movable tooth part, a plurality of cutting teeth which are arranged at intervals are arranged in the movable tooth part, and movable tooth grooves with openings are formed between adjacent cutting teeth;

height H of movable tooth part ₁ Is smaller than the height H of the fixed tooth part ₂ The tooth tips of the cutting teeth in the movable tooth part are overlapped with the edge of the upper end of the movable tooth part, when the movable tooth part is in contact with the end face of the fixed tooth part, the tooth tips of the cutting teeth in the movable tooth part are positioned below the tooth tips of the cutting teeth in the fixed tooth part, and the lower peaks of the outer side walls of the left end and the right end of the movable tooth part are positioned below the groove bottoms of at least one static tooth groove at the outermost sides of the two ends of the fixed tooth part.

Preferably, the bottoms of the static tooth grooves in the fixed tooth part are positioned on the same horizontal line, and the lower top points of the outer side walls of the left end and the right end of the movable tooth part are positioned below the bottoms of the static tooth grooves in the fixed tooth part.

Preferably, the static tooth groove comprises at least one side tooth groove positioned at the outermost sides of two ends of the static tooth groove and an inner tooth groove positioned between the two end side tooth grooves, the depth of each side tooth groove is smaller than that of the inner tooth groove, the bottoms of the side tooth grooves and the bottoms of the inner tooth grooves are positioned above the bottoms of the inner tooth grooves on different horizontal lines, and the lower peaks of the outer side walls of the left end and the right end of the movable tooth part are positioned below the bottoms of the side tooth grooves.

Preferably, a groove is arranged on the end face of the movable tooth part, which is attached to the fixed tooth part, and the length of the groove is smaller than that of the movable tooth part and is arranged along the center of the movable tooth part, so that the lower top points of the outer side walls of the left end and the right end of the movable tooth part are positioned below the bottom of the static tooth groove.

Preferably, the outer side walls at the two ends of the movable tooth part are inclined, and an included angle between the outer side walls and the joint surface of the movable tooth part and the fixed tooth part is an acute angle.

The utility model has the advantages that the height of the movable tooth part is increased, the lower top points of the outer side walls of the left end and the right end of the movable tooth part are arranged below the groove bottom of at least one static tooth groove at the outermost sides of the two ends of the fixed tooth part, when the movable tooth part horizontally swings along the fixed tooth part after the height of the movable tooth part is increased, the outer side walls of the two ends of the movable tooth part can push or cut off the hair entering the groove bottom of at least one static tooth groove at the outermost sides of the two ends of the fixed tooth part to the outside of the two ends of the fixed tooth part, thereby effectively preventing the hair entering the groove bottom of the static tooth groove from being brought into the movable tooth part and the fixed tooth part when the movable tooth part swings reciprocally, avoiding the phenomenon of hair pulling or clamping of the trimming cutter head in the working process, avoiding the sense of pulling pain caused by hair pulling or clamping, and improving the use comfort of the trimming cutter head.

Drawings

FIG. 1 is a front view showing an assembly of a hair-clipping prevention hair-clipping head according to an embodiment of the utility model

FIG. 2 is a perspective assembly view of a hair trimmer head for preventing pinching according to an embodiment of the present utility model

FIG. 3 is a front perspective view of a movable knife according to an embodiment of the present utility model

FIG. 4 is a bottom view of a movable cutter according to an embodiment of the present utility model

FIG. 5 is a plan view of a stationary blade according to a first embodiment of the present utility model

FIG. 6 is a plan view of a stationary blade according to a second embodiment of the present utility model

Detailed Description

Embodiments of the utility model are further described below with reference to the accompanying drawings:

as shown in fig. 1-6, the utility model relates to a hair trimming cutter head for preventing hair from being clamped, which comprises a static cutter 1 and a movable cutter 2, wherein the movable cutter 2 can swing back and forth relative to the static cutter 1 under the drive of an eccentric shaft driven by a motor to rotate (not shown in the drawings); the static cutter 1 comprises a fixed tooth part 11, a plurality of cutting teeth 3 which are arranged at intervals are arranged in the fixed tooth part 11, a static tooth groove 12 with an opening is formed between every two adjacent cutting teeth 3, the movable cutter 2 comprises a movable tooth part 21, a plurality of cutting teeth 3 which are arranged at intervals are arranged in the movable tooth part 21, a movable tooth groove 22 with an opening is formed between every two adjacent cutting teeth 3, the opening-shaped static tooth groove 12 and the movable tooth groove 22 are used for leading in the separation of hairs, and after the hairs enter the static tooth groove 12 and the movable tooth groove 22, the motor rotates to drive the eccentric shaft to rotate so as to drive the movable tooth part 21 of the movable cutter 2 to swing reciprocally along the fixed tooth part 11 of the static cutter 1 to cut the hairs. To prevent the movable blade 2 from cutting the skin while swinging reciprocally along the stationary blade 1, the movable tooth portion 21 has a height H ₁ Is smaller than the height H of the tooth part 11 ₂ The fixed tooth part 11 is directly contacted with skin when in use, and the movable tooth part 21 has a height H ₁ Is smaller than the height H of the tooth part 11 ₂ In this case, the movable tooth portion 21 does not go beyond the fixed tooth portion11 contact the skin, thereby avoiding cutting the skin when the movable cutter 2 swings reciprocally to cut the hair, and improving the use safety of the trimming cutter head.

In order to facilitate the hair to be guided into the static knife 1 and the movable knife 2, the tooth tips of the cutting teeth 3 in the fixed tooth part 11 of the static knife 1 are respectively overlapped with the edge of the upper end of the fixed tooth part 11, the tooth tips of the cutting teeth 3 in the movable tooth part 21 are overlapped with the edge of the upper end of the movable tooth part 21, so that an open static tooth groove 12 and a movable tooth groove 22 are formed between two adjacent cutting teeth 3 in the fixed tooth part 11 and the movable tooth part 21, when in use, the hair can enter through the openings of the static tooth groove 12 and the movable tooth groove 22, and when the movable tooth groove 22 can also horizontally reciprocate relative to the static tooth groove 12 under the driving of the motor driving the eccentric shaft to reciprocate along the fixed tooth part 11 of the static knife 1, the cutting teeth 3 on two sides of the movable tooth groove 22 are utilized to cut the hair, so that the hair is trimmed.

The total length of the cutting teeth 3 arranged in the fixed tooth part 11 of the existing static knife 1 is basically larger than the total length of the cutting teeth 3 arranged in the movable tooth part 21 of the movable knife 2, and is influenced by the single-side swing travel distance of the movable knife 2 or the width of the static tooth groove 12, when the movable knife 2 swings horizontally and reciprocally along the static knife 1, at least one static tooth groove 12 at the outermost side of the two ends of the fixed tooth part 11 is completely separated from the coverage of the movable tooth part 21 once in single-side swing, and at the moment, the hair possibly avoids the blocking of the cutting teeth 3 or the movable tooth groove 22 on the movable knife 2 and directly enters the groove bottom of the static tooth groove 12. The height of the movable tooth part 21 of the conventional movable cutter 2 is smaller than the depth of the static tooth groove 12, and the lower end edge of the movable tooth part 21 is arranged above the bottom of the static tooth groove 12, so that the hair entering the bottom of the static tooth groove 12 cannot be cut by the cutting edges of the cutting teeth 3 at the extreme edges of the two ends of the movable tooth part 21, and at the moment, the hair at the bottom of the static tooth groove 12 can be brought into the middle area of the movable tooth part 21 and the fixed tooth part 11, so that the hair is clamped between the end surfaces of the movable tooth part 21 and the fixed tooth part 11, the phenomenon of hair pulling or clamping is caused, the skin of a customer is caused to produce uncomfortable feeling due to pulling pain, and the use comfort of the trimming cutter head is reduced.

In view of this, when the movable tooth portion 21 is assembled with the end face of the fixed tooth portion 11 in a fitting manner, the tooth tip of each cutting tooth 3 in the movable tooth portion 21 is located below the tooth tip of each cutting tooth 3 in the fixed tooth portion 11, and the lower peaks 24 of the outer side walls 23 of the left and right ends of the movable tooth portion 21 are located below the bottom of at least one stationary tooth slot 12 on the outermost side of the two ends of the fixed tooth portion 11. The tooth tips of the cutting teeth 3 in the movable tooth part 21 are lower than the tooth tips of the cutting teeth 3 in the fixed tooth part 11, so that the cutting teeth 3 of the movable cutter 2 can be prevented from directly contacting the skin, the skin is prevented from being cut, and the use safety of hair trimming is improved. By increasing the height of the movable tooth 21 and placing the lower peaks 24 of the outer side walls 23 at the left and right ends of the movable tooth 21 (which can also be regarded as the lower end edges of the movable tooth 21) under the bottoms of at least one of the static tooth grooves 12 at the outermost sides of the fixed tooth 11, after increasing the height of the movable tooth 21, the friction resistance between the movable tooth 21 and the fixed tooth 11 is increased, which results in the rise of the temperature rise of the static knife 1 and the movable knife 2, but the lower peaks 24 of the outer side walls 23 at the two ends of the lengthened movable tooth 21 are placed under the static tooth grooves 12, when the movable tooth 21 swings horizontally along the fixed tooth 11, the outer side walls 23 at the two ends of the movable tooth 21 push the hair entering the bottoms of at least one of the static tooth grooves 12 at the outermost sides of the fixed tooth 11 to the outer sides of the fixed tooth 11, thereby effectively preventing the hair entering the bottoms of the static tooth 12 from being brought into the inside of the movable tooth 21 and the fixed tooth 11 when the movable tooth 21 swings reciprocally, avoiding the phenomenon that the hair is pulled or clamped or the hair is clamped during the working process, and the trimming and comfortable and the trimming and cutting head is prevented from being used.

In order to prevent hair from entering the groove bottom of the stationary tooth groove 12 and being blocked between the end surfaces where the fixed tooth part 11 and the movable tooth part 21 are attached during the working process of the trimming cutter head, the inventor proposes two different specific embodiments to solve the problems of napping or hair clamping and the like under the conception of the general technical scheme:

example 1

The bottoms of the static tooth grooves 12 in the fixed tooth part 11 are positioned on the same horizontal line, and the lower vertexes 24 of the outer side walls 23 at the left end and the right end of the movable tooth part 21 are positioned below the bottoms of the static tooth grooves 12 in the fixed tooth part 11. The bottoms of the static tooth grooves 12 in the fixed tooth part 11 are arranged on the same horizontal line, when the movable tooth part 21 is in end face lamination with the fixed tooth part 11, the lower top points 24 (also can be regarded as the lower end edges of the movable tooth part 21) of the outer side walls 23 at the two ends of the movable tooth part 21 are arranged below the bottoms of the static tooth grooves 12, so that the movable tooth part 21 can completely cover the bottoms of the static tooth grooves 12, when the movable tooth part 21 swings along one side of the fixed tooth part 11, at least one static tooth groove 12 at the left end and the right end of the fixed tooth part 11, which is the outermost side relative to one end of the swinging direction, is completely separated from the movable tooth part 21, hair possibly penetrates into the bottoms of the static tooth grooves 12 without being blocked by the movable tooth part 21, at the moment, the movable tooth part 21 swings along the opposite direction, and when the lower top points 24 of the outer side walls 23 at the two ends of the movable tooth part 21 are arranged below the static tooth grooves 12 in the fixed tooth part 11, the outer side walls 23 of the movable tooth part 21 can push the hair entering the bottoms of the static tooth grooves 12 to the bottoms of the static tooth grooves 12, the hair at the bottoms of the static tooth part 12, and the hair can be prevented from being blocked by the hair, and the hair is prevented from being clamped into the hair clamping area between the fixed tooth part and the hair 11, thereby the skin is prevented from being clamped into the skin, and the skin is prevented from being clamped into the skin or the skin is easy.

Example 2

Unlike the above-mentioned technical solution for increasing the height of the movable tooth portion 21 of the movable blade 2 to make the lower vertex 24 of the outer sidewall 23 at the bottom of the static tooth slot 12, the embodiment provides a technical solution for shortening the depth of the static tooth slot 12 at the edges of the two ends of the fixed tooth portion 11 to make the lower vertex 24 of the outer sidewall 23 at the two ends of the movable tooth portion 21 at the bottom of the static tooth slot 12, which comprises the following specific embodiments:

the static tooth groove 12 comprises at least one side tooth groove 121 positioned at the outermost sides of the two ends of the static tooth groove 12 and an inner tooth groove 122 positioned between the two end side tooth grooves 121, the depth of each side tooth groove 121 is smaller than that of the inner tooth groove 122, the bottoms of the side tooth grooves 121 and the bottoms of the inner tooth grooves 122 are positioned on different horizontal lines and above the bottoms of the inner tooth grooves 122, and the lower vertexes 24 of the outer side walls 23 at the left end and the right end of the movable tooth part 21 are positioned below the bottoms of the side tooth grooves 121. The static tooth groove 12 is divided into the side tooth groove 121 and the inner tooth groove 122 with different depths, the side tooth groove 121 with easy napping and hair clamping at the two ends of the fixed tooth part 11 is shortened in depth, the bottom of the side tooth groove 121 is arranged above the bottom of the inner tooth groove 122, when the movable tooth part 21 is attached to the end face of the fixed tooth part 11, the lower top 24 of the outer side wall 23 at the two ends of the movable tooth part 21 (also can be regarded as the lower end edge of the movable tooth part 21) can be arranged below the bottom of the side tooth groove 121 to completely cover the side tooth groove 121, or can be arranged below the bottom of the inner tooth groove 122 to completely cover all the side tooth groove 121 and the inner tooth groove 122, as in the embodiment 1. When the lower peaks 24 of the outer side walls 23 at the two ends of the movable tooth part 21 (i.e. the lower end edges of the movable tooth part 21) are arranged above the bottom of the inner tooth groove 122 and below the bottom of the side tooth groove 121, the height of the fixed tooth part 11 is not required to be lengthened, so that the friction resistance between the movable tooth part 21 and the fixed tooth part 11 is reduced, and the temperature rise of the static knife 1 and the movable knife 2 is reduced. When the movable tooth portion 21 swings along the single side of the fixed tooth portion 11, at least one of the side tooth grooves 121 at the left and right ends of the fixed tooth portion 11, which is the outermost side with respect to one end in the swinging direction, is completely separated from the movable tooth portion 21, and hair may enter the groove bottom of the side tooth groove 121 without being blocked by the movable tooth portion 21, at this time, the movable tooth portion 21 swings in the opposite direction, when the outer side walls 23 of the movable tooth portion 21 slide above the side tooth groove 121, since the lower peaks 24 of the outer side walls 23 at the two ends of the movable tooth portion 21 are positioned below the tooth grooves in the fixed tooth portion 11, the outer side walls 23 of the movable tooth portion 21 can push hair entering the bottom of the side tooth groove 121 to the outside of the side tooth groove 121, preventing the hair from being brought into the middle area of the fixed tooth portion 11, thereby avoiding the hair from being blocked between the fixed tooth portion 11 and the end face of the movable tooth portion 21 to cause a draggy feeling of skin, achieving the technical purpose of preventing the hair from being pulled or pinching, and improving the use comfort of the cutter head.

Specifically, in the above two embodiments, when the movable tooth portion 21 swings reciprocally along the fixed tooth portion 11, the lower peaks 24 of the outer side walls 23 at the two ends (i.e. the lower edges of the movable tooth portion 21) can be separated from at least one of the static tooth grooves 12 or the side tooth grooves 121 at the outermost ends of the fixed tooth portion 11, wherein at least one of the two ends needs to be determined according to the length of the swing stroke distance of the movable blade 2 and the width of the static tooth groove 12, if the horizontal reciprocating swing stroke of the movable blade 2 is shorter and the width of the static tooth groove 12 is wider, only one of the static tooth grooves 12 or the side tooth groove 121 at the outermost ends of the fixed tooth portion 11 can be separated. If the horizontal reciprocating swing stroke of the movable blade 2 is long and the width of the stationary tooth groove 12 or the side tooth groove 121 is narrow, it is possible to disengage the two or three stationary tooth grooves 12 or side tooth grooves 121 on the outermost sides of the both ends of the stationary tooth part 11.

When the height of the movable tooth part 21 is increased, the lower vertexes 24 of the outer side walls 23 at the two ends of the movable tooth part can be placed below the bottom of the static tooth groove 12 of the fixed tooth part 11, but the contact area of the movable tooth part 21 and the fixed tooth part 11 is relatively increased, so that the friction resistance is increased, and the temperature rise of the static knife 1 and the movable knife 2 is correspondingly increased. In order to reduce the contact area between the static knife 1 and the dynamic knife 2 and reduce friction resistance and temperature rise, a groove 25 is arranged on the end face of the dynamic tooth part 21, which is attached to the fixed tooth part 11, and the length of the groove 25 is smaller than that of the dynamic tooth part 21 and is arranged along the center of the dynamic tooth part 21, so that the lower vertexes 24 of the outer side walls 23 at the left end and the right end of the dynamic tooth part 21 are positioned below the bottom of the static tooth groove 12. By arranging the grooves 25 with the length smaller than the length of the movable tooth part 21 on the end surface where the movable tooth part 21 is attached to the fixed tooth part 11, the lower vertexes 24 of the outer side walls 23 at the two ends of the movable tooth part 21 are not only positioned below the bottoms of the static tooth grooves 12 in the fixed tooth part 11, but also used for pushing out the hair entering the bottoms of the static tooth grooves 12 towards the outside of the fixed tooth part 11, so that phenomena such as napping and hair clamping are avoided; meanwhile, the contact area between the movable tooth part 21 and the fixed tooth part 11 can be effectively reduced, the friction resistance between the movable tooth part 21 and the fixed tooth part 11 is reduced, and the temperature rise between the movable cutter 2 and the static cutter 1 is reduced.

The outer side walls 23 at the two ends of the movable tooth part 21 push out the hair entering the bottom of the static tooth groove 12 towards the outside of the fixed tooth part 11 to generate a napping or pinching phenomenon, so that skin is provided with a pulling pain, the outer side walls 23 at the two ends of the movable tooth part 21 are inclined, the included angle between the outer side walls 23 at the two ends of the movable tooth part 21 and the joint surface of the fixed tooth part 11 is an acute angle, the outer side walls 23 at the two ends of the movable tooth part 21 are inclined, the included angle between the outer side walls 23 at the two ends of the movable tooth part 21 and the joint surface of the movable tooth part 21 and the fixed tooth part 11 forms an acute angle blade, when the movable tooth part 21 horizontally swings along the fixed tooth part 11, the hair possibly enters the bottom of one or more static tooth grooves 12 or edge tooth grooves 121 at the outermost sides of the two ends of the fixed tooth part 11, and the movable tooth part 21 can be matched with the edge part of the static tooth groove 12 (namely the blade of the cutting tooth 3) in the fixed tooth part 11 to directly cut the hair in the process of pushing the hair towards the outside of the fixed tooth part 11, so that the hair is prevented from generating the napping or pinching phenomenon, and the skin is prevented from generating a clipping pain, and the cutter head is easy to use.

In order to reduce the temperature rise of the movable cutter 2 and the static cutter 1 to the greatest extent, the movable cutter 2 further comprises a linkage part 26 and a support part 27, wherein the two sides of the linkage part 26 are bent at the same horizontal plane, the support part 27 and the movable tooth part 21 are respectively connected with the support part 27 and the movable tooth part 21 into a whole, so that the linkage part 26 is arched, the movable tooth part 21 and the support part 27 of the movable cutter 2 are respectively attached to the end face of the static cutter 1 during assembly, the contact area between the movable cutter 2 and the static cutter 1 is reduced, the linkage part 26 is connected with a driving mechanism, and the movable cutter 2 is ensured to swing back and forth along the static cutter 1 under the driving of an external force, so that the hair is trimmed.

The above embodiments should not be construed as limiting the utility model, but any modifications based on the spirit of the utility model should be within the scope of the utility model.

Claims (5)

1. The hair trimming cutter head for preventing hair clamping comprises a static cutter (1) and a movable cutter (2), wherein the movable cutter (2) can swing back and forth relative to the static cutter (1) under the drive of external force; the static cutter (1) comprises a tooth fixing part (11), a plurality of cutting teeth (3) which are arranged at intervals are arranged in the tooth fixing part (11), and static tooth grooves (12) with openings are formed between adjacent cutting teeth (3);

the movable cutter (2) comprises a movable tooth part (21), a plurality of cutting teeth (3) which are arranged at intervals are arranged in the movable tooth part (21), and movable tooth grooves (22) with openings are formed between adjacent cutting teeth (3);

height H of the movable tooth part (21) ₁ Is smaller than the height H of the tooth part (11) ₂ The tooth tips of the cutting teeth (3) in the movable tooth part (21) are overlapped with the upper end edge of the movable tooth part (21), when the movable tooth part (21) is attached to the end face of the fixed tooth part (11), the tooth tips of the cutting teeth (3) in the movable tooth part (21) are positioned below the tooth tips of the cutting teeth (3) in the fixed tooth part (11), and the lower peaks (24) of the outer side walls (23) of the left end and the right end of the movable tooth part (21) are positioned below the bottom of at least one static tooth groove (12) at the outermost sides of the two ends of the fixed tooth part (11).

2. The hair trimming head for preventing hair pinching according to claim 1, wherein the bottoms of the respective stationary tooth grooves (12) in the stationary tooth portion (11) are on the same horizontal line, and the lower apexes (24) of the outer side walls (23) of the left and right ends of the movable tooth portion (21) are positioned below the bottoms of the respective stationary tooth grooves (12) in the stationary tooth portion (11).

3. The hair trimming head for preventing hair pinching according to claim 1, characterized in that the stationary tooth groove (12) comprises at least one side tooth groove (121) located at the outermost sides of both ends of the stationary tooth groove (12) and an inner tooth groove (122) located between both end side tooth grooves (121), each side tooth groove (121) has a depth smaller than that of the inner tooth groove (122), and the groove bottom of the side tooth groove (121) and the groove bottom of the inner tooth groove (122) are located above the groove bottom of the inner tooth groove (122) on different horizontal lines, and lower apexes (24) of the outer side walls (23) of the left and right ends of the movable tooth part (21) are located below the groove bottom of the side tooth groove (121).

4. The hair trimming head for preventing hair clipping according to claim 1, characterized in that a groove (25) is provided on the end face of the movable tooth portion (21) which is attached to the fixed tooth portion (11), the length of the groove (25) is smaller than that of the movable tooth portion (21) and is centrally provided along the movable tooth portion (21), so that the lower vertexes (24) of the outer side walls (23) of the left and right ends of the movable tooth portion (21) are positioned below the bottom of the stationary tooth groove (12).

5. Hair trimming head for preventing hair pinching according to claim 1, characterized in that the outer side walls (23) of both ends of the movable tooth portion (21) are inclined at an acute angle to the abutment surface of the movable tooth portion (21) and the fixed tooth portion (11).