A hair cutter and a cutting head assembly thereof

Abstract

The utility model provides a kind of hair cutter and its cutter head assembly, the cutter head assembly includes fixed unit and the dynamic unit that can reciprocate relative to the fixed unit;The fixed unit includes the static cutter with inverted U-shaped cross section, the static cutter upper portion is provided with comb tooth part, the comb tooth part has a plurality of teeth arranged in interval between static cutter two ends, the tooth one end is into hair end, other end is cutting end;The dynamic unit includes tool rest and the dynamic cutter with cutting rack, the dynamic cutter is fixedly connected with the tool rest, the cutting rack and the tool rest form have hair space between;The cutting rack is side by side arranged below comb tooth part, and the cutting rack with the tooth into hair end first preset interval has and makes into hair space between the two form have into hair space.The utility model cutting rack and the tooth into hair end between form have into hair space, can make the longer hair that from comb tooth part into hair end side enters smoothly into the cutting rack, improves cutting effect.

Description

Technical Field

[0001] This utility model relates to the technical field of hair cutting devices, and in particular to a hair cutter and its blade assembly. Background Technology

[0002] Electric shavers and trimmers utilize various mechanisms to provide hair cutting functionality. Among these, the head assembly is the main component that enables its hair cutting function. The head assembly typically includes at least one pair of moving and stationary blades that work together to achieve the cutting action.

[0003] In existing technologies, both the moving and stationary blades have a U-shaped structural design. The combing gap on the stationary blade and the cutting area on the moving blade are both located on the bottom surface of their respective U-shaped structures. When the blade assembly is installed, the side plates on both sides of the moving and stationary blades are fitted together, making the moving blade a closed state. As a result, when longer hairs enter the blade head, they will first get stuck on the mating surface of the side plates of the moving and stationary blades and cannot smoothly enter the cutting area of ​​the moving blade. This results in limited cutting effect on longer hairs and affects the user experience. Utility Model Content

[0004] In view of this, the purpose of this utility model is to provide a hair cutter and its blade assembly, which solves the problem that when longer hairs enter the blade head, they first get stuck on the mating surface of the moving and stationary blade side plates and cannot smoothly enter the cutting area of ​​the moving blade, resulting in limited cutting effect on longer hairs and affecting user experience.

[0005] To solve the above-mentioned technical problems, the technical solution used in this utility model is as follows:

[0006] The present invention provides a blade assembly for a hair cutter, comprising a fixed unit and a moving unit;

[0007] The fixed unit includes a stationary blade with an inverted U-shaped cross-section. Fixed seats are respectively provided at both ends of the stationary blade. The stationary blade and the fixed seats surround a moving space. The stationary blade and the fixed seats restrict the moving unit in the moving space. The moving unit can reciprocate relative to the fixed unit in the moving space. A comb tooth part is provided on the upper part of the stationary blade. The comb tooth part has a plurality of teeth spaced apart between the two ends of the stationary blade. One end of the teeth is the hair inlet end and the other end is the cutting end.

[0008] The moving unit includes a blade holder and a moving blade with a cutting rack. The moving blade is fixedly connected to the blade holder, and a bristle-accommodating space is formed between the cutting rack and the blade holder.

[0009] The cutting teeth are arranged side by side below the comb teeth, and the cutting teeth and the hair-entry ends of the teeth have a first preset distance to form a hair-entry space between them.

[0010] When the moving unit performs the reciprocating motion relative to the stationary unit, the cutting rack cooperates with the comb teeth to cut hair.

[0011] Preferably, the cutting toothed bar is comb-shaped, the moving blade has an elongated cutting plate surface, the cutting toothed bar is disposed on one side of the cutting plate surface, and the opening of the cutting toothed bar faces the hair-feeding end of the tooth;

[0012] The cutting plate surface is detachably connected to the tool holder, and the cutting plate surface and the top side of the tool holder have a second preset distance.

[0013] More preferably, a fixing member extending towards the blade holder is provided on the other side of the cutting plate surface, and the blade holder is correspondingly provided with a fixing groove. After the fixing member is inserted into the fixing groove, the cutting plate surface and the blade holder are detachably connected.

[0014] Alternatively, a fixing groove is provided on the other side of the cutting plate surface, and the tool holder is correspondingly provided with a fixing member extending towards the cutting plate surface. After the fixing member is inserted into the fixing groove, the cutting plate surface and the tool holder are detachably connected.

[0015] More preferably, at least one protrusion is provided at intervals along the extension direction of the cutting plate surface on the top side of the blade holder, the protrusion protruding towards the cutting plate surface and the protrusion height not greater than the second preset spacing.

[0016] More preferably, the top side of the protrusion is an arc surface;

[0017] And / or, the protrusion is hemispherical.

[0018] More preferably, the moving blade also includes a connecting plate, one side of which is connected to the other side of the cutting plate, and the cross-section of the two is L-shaped. The other side of the connecting plate is detachably connected to the blade holder.

[0019] More preferably, a slot is provided on the other side of the connecting plate, and a fixing post perpendicular to the slot is provided on one side of the tool holder. After the fixing post is inserted into the corresponding slot, the connecting plate and the tool holder are detachably connected.

[0020] More preferably, at least one slot is provided on each side of the folded center line of the connecting plate, and the tool holder is provided with a corresponding fixing post;

[0021] And / or, the cutting plate surface and the connecting plate surface are an integral folded edge plate;

[0022] And / or, the two ends of the connecting plate are respectively provided with grooves parallel to the reciprocating motion direction.

[0023] Preferably, the stationary blade includes a connecting edge plate and a first side plate and a second side plate located on both sides of the connecting edge plate, wherein the first side plate, the second side plate and the connecting edge plate are integrally bent into the inverted U-shape;

[0024] The comb teeth are disposed on the connecting side plate. The connecting side plate includes a main plate and a composite plate. The composite plate is attached to the main plate below the main plate, and one side of the composite plate on the same side as the hair inlet end is aligned and connected to one side of the main plate. The other side of the composite plate is connected to the first side plate.

[0025] More preferably, the lower side of the main body plate located between the first side plate and the second side plate is inclined upward from the second side plate side, and the thickness of the main body plate located between the first side plate and the second side plate decreases from the second side plate to the first side plate.

[0026] Another objective of this invention is to provide a hair cutter, including a blade unit, wherein the blade unit is provided with the aforementioned blade assembly for a hair cutter, and the hair-feeding end of the teeth in the blade assembly faces outward from the blade unit.

[0027] Compared with the prior art, the advantages of the blade assembly for a hair cutter described in this utility model are mainly reflected in:

[0028] In this utility model's blade assembly, the stationary blade is equipped with a comb-tooth section, with one end of the comb-tooth section serving as the hair-inlet end and the other end as the cutting end. The moving blade is equipped with a cutting toothed strip, and the cutting toothed strip and the hair-inlet end of the comb-tooth section have a first preset distance, creating a hair-inlet space between them. This allows the moving blade to be in a semi-open state, so that longer hairs entering from the hair-inlet end of the comb-tooth section will smoothly enter the cutting toothed strip through the hair-inlet space, avoiding the situation where they are blocked and unable to enter the cutting toothed strip. This improves the cutting effect of the blade assembly on longer hairs and enhances the user experience. Therefore, it solves the problem that when longer hairs enter the blade head, they are first blocked at the contact surface of the moving blade and the stationary blade side plate and cannot smoothly enter the cutting area of ​​the moving blade, resulting in limited cutting effect on longer hairs and affecting the user experience.

[0029] Compared with the prior art, the hair cutter of this utility model uses the above-mentioned blade assembly and has the beneficial effects of the above-mentioned blade assembly. Attached Figure Description

[0030] The above and other objects, features, and advantages of this invention will become clearer through a more detailed description of the preferred embodiments shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally drawn to scale with actual dimensions; the focus is on illustrating the gist of this invention.

[0031] Figure 1 A three-dimensional structure of a blade assembly for a hair cutter provided in this embodiment of the present invention. Figure 1 ;

[0032] Figure 2 for Figure 1 Exploded structure diagram;

[0033] Figure 3 for Figure 1 Cross-section Figure 1 ;

[0034] Figure 4 for Figure 1 Cross-section Figure 2 ;

[0035] Figure 5 for Figure 2 A three-dimensional structural diagram of the assembled moving blade and the tool holder;

[0036] Figure 6 A three-dimensional structure of a blade assembly for a hair cutter provided in this embodiment of the present invention. Figure 2 ;

[0037] Figure 7 for Figure 6 Exploded structure diagram;

[0038] Figure 8 for Figure 6 Cross-section Figure 1 ;

[0039] Figure 9 for Figure 6 Cross-section Figure 2 ;

[0040] Figure 10 for Figure 7 A three-dimensional structural diagram of the assembled moving blade and the tool holder;

[0041] Figure 11 A three-dimensional structural diagram of the stationary knife provided in an embodiment of this utility model;

[0042] Figure 12 for Figure 11 Cross-sectional view;

[0043] Figure label:

[0044] 100 stationary blade, 110 connecting side plate, 111 main body plate, 112 overlapping plate, 120 first side plate, 130 second side plate, 140 comb teeth, 141 teeth.

[0045] Tool holder 200, protrusion 210, fixing post 220;

[0046] Fixture 300, pin 310;

[0047] Moving blade 400, cutting plate surface 410, cutting rack 411, connecting plate surface 420, slot 421, groove 422;

[0048] 1. Feather receiving space; 2. Feather feeding space; 3. Fixing component; 4. Fixing groove; 5. Moving space. Detailed Implementation

[0049] The technical solution of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand this utility model and implement it. However, the embodiments are not intended to limit this utility model. In this embodiment, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this utility model.

[0050] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to and integrated with the other element, or there may be an intervening element present. The terms "mounted," "one end," "the other end," and similar expressions used in this invention are for illustrative purposes only.

[0051] This embodiment provides a blade assembly for a hair cutter, such as... Figures 1 to 10 As shown, it includes fixed elements and moving elements;

[0052] The fixed unit includes a stationary blade 100 with an inverted U-shaped cross-section. Fixed seats 300 are respectively provided at both ends of the stationary blade 100. The stationary blade 100 and the fixed seats 300 surround a moving space 5. The stationary blade 100 and the fixed seats 300 restrict the moving unit in the moving space 5. The moving unit can reciprocate relative to the fixed unit in the moving space 5. A comb tooth part 140 is provided on the upper part of the stationary blade 100. The comb tooth part 140 has a plurality of teeth 141 arranged at intervals between the two ends of the stationary blade 100. One end of the teeth 141 is the hair inlet end and the other end is the cutting end. The comb tooth part 140 can comb the hair close to the skin away from the skin surface and stand it up so that it can enter the moving unit for cutting.

[0053] The moving unit includes a blade holder 200 and a moving blade 400 with a cutting rack 411. The moving blade 400 is fixedly connected to the blade holder 200. A hair-accommodating space 1 is formed between the cutting rack 411 and the blade holder 200 to accommodate the hair to be cut and the hair after cutting. It should be noted that the fixed connection between the moving blade 400 and the blade holder 200 is not a simple fixed connection, but rather a connection in which the two can maintain synchronous movement during reciprocating motion.

[0054] Cutting teeth 411 are arranged side by side below comb teeth 140, and the cutting teeth 411 and the hair-entry ends of the teeth 141 have a first preset distance so that a hair-entry space 2 is formed between them.

[0055] When the moving unit reciprocates relative to the stationary unit, the cutting rack 411 cooperates with the comb teeth 140 to cut hair.

[0056] In this embodiment, the stationary blade 100 of the head assembly is provided with a comb tooth section 140. One end of the teeth 141 of the comb tooth section 140 is the hair inlet end, and the other end is the cutting end. The moving blade 400 is provided with a cutting toothed bar 411, and the cutting toothed bar 411 and the hair inlet end of the teeth 141 have a first preset distance, so that a hair inlet space 2 is formed between the two. This allows the moving blade 400 to be in a semi-open state. In this way, after longer hair enters from the hair inlet end side of the comb tooth section 140, it will smoothly enter the cutting toothed bar 411 through the hair inlet space 2, avoiding the situation where it is blocked and cannot enter the cutting toothed bar 411. This improves the cutting effect of the head assembly on longer hair and improves the user experience. Therefore, it can solve the problem that after longer hair enters the head, it will first be blocked at the mating surface of the side plate of the moving blade 400 and the stationary blade 100 and cannot smoothly enter the cutting area of ​​the moving blade 400, resulting in a limited cutting effect on longer hair and affecting the user experience.

[0057] In a preferred embodiment, such as Figure 2 , 4 7 and Figure 9As shown, the cutting rack 411 is comb-shaped, the moving blade 400 has a long strip-shaped cutting plate surface 410, the cutting rack 411 is disposed on one side of the cutting plate surface 410, and the opening of the cutting rack 411 faces the hair inlet end of the teeth 141; the cutting plate surface 410 is detachably connected to the blade holder 200, and the cutting plate surface 410 and the top side of the blade holder 200 have a second preset distance to form a hair-accommodating space 1.

[0058] In a further preferred embodiment, such as Figure 7 As shown, a fixing member 3 extending towards the tool holder 200 is provided on the other side of the cutting plate surface 410. The tool holder 200 is correspondingly provided with a fixing groove 4. After the fixing member 3 is inserted into the fixing groove 4, the cutting plate surface 410 and the tool holder 200 are detachably connected.

[0059] Alternatively, a fixing groove 4 is provided on the other side of the cutting plate surface 410, and a fixing member 3 extending towards the cutting plate surface 410 is provided on the tool holder 200 accordingly. After the fixing member 3 is inserted into the fixing groove 4, the cutting plate surface 410 and the tool holder 200 are detachably connected.

[0060] In this embodiment, the moving blade 400 structure is only the cutting plate surface 410, which is simple in material and easy to process; in terms of installation, it can be easily installed and disassembled by simply cooperating with the fixing part 3 and the fixing groove 4.

[0061] In another preferred embodiment, such as Figure 2 , 7 and Figure 10 As shown, at least one protrusion 210 is provided at intervals along the extension direction of the cutting plate surface 410 on the top side of the tool holder 200. The protrusion 210 protrudes towards the cutting plate surface 410 and its protrusion height is not greater than the second preset spacing. In this embodiment, by providing the protrusion 210, the distance between the cutting plate surface 410 and the top side of the tool holder 200 can be ensured, avoiding the fastener 3 from excessively extending into the fixing groove 4 during installation, which would cause the cutting plate surface 410 to be too close to the top side of the tool holder 200, or even to be in contact with the top side of the tool holder 200, thus affecting the formation of the bristle-holding space 1. In addition, by controlling the height of the protrusion 210, sufficient bristle-holding space 1 can be ensured, preventing the fastener 3 from moving relative to the fixing groove 4 and changing the size of the bristle-holding space 1 as the usage time increases. Therefore, the machining accuracy of the fit between the fastener 3 and the fixing groove 4 can also be reduced.

[0062] Furthermore, the top side of the protrusion 210 is an arc surface to reduce the frictional force that may occur when the cutting plate surface 410 reciprocates and rubs against the protrusion 210; in this embodiment, the protrusion 210 is hemispherical.

[0063] In another preferred embodiment, such as Figure 2As shown, the moving blade 400 also includes a connecting plate 420. One side of the connecting plate 420 is connected to the other side of the cutting plate 410, and their cross-sections are L-shaped. The other side of the connecting plate 420 is detachably connected to the blade holder 200. Further, as... Figure 5 As shown, a slot 421 is provided on the other side of the connecting plate 420, and a fixing post 220 perpendicular to the slot 421 is provided on one side of the tool holder 200. After the fixing post 220 is inserted into the corresponding slot 421, the connecting plate 420 and the tool holder 200 are detachably connected. In this embodiment, the matching structure of the slot 421 and the fixing post 220 can facilitate the convenient installation of the moving tool 400 and the tool holder 200. In addition, the moving tool 400 is made of plate material, which is easy to process. Further preferably, the cutting plate 410 and the connecting plate 420 are an integral folded plate, which not only facilitates processing but also ensures the flatness of the cutting plate 410 through a single bending. The connecting plate 420 has grooves 422 parallel to the reciprocating motion direction at both ends. At least one slot 421 is provided on both sides of the folded center line of the connecting plate 420, and the tool holder 200 is provided with corresponding fixing posts 220, thereby improving the stability of the connection between the moving tool 400 and the tool holder 200 and improving the smoothness of the moving tool 400 during reciprocating movement. Figure 2 In the embodiment shown, a slot 421 is symmetrically provided on both sides of the center of gravity of the connecting plate surface 420.

[0064] In another preferred embodiment, such as Figure 11 and 12 As shown, the stationary blade 100 includes a connecting side plate 110 and a first side plate 120 and a second side plate 130 located on both sides of the connecting side plate 110. The first side plate 120, the second side plate 130, and the connecting side plate 110 are integrally bent into an inverted U-shape; in this embodiment, as shown... Figure 3 and 8 As shown, after the tool holder 200 and the moving tool 400 are fixedly connected, they are housed in the U-shaped cavity formed by the stationary tool 100. The stationary tool 100 is provided with a fixed seat 300 at both ends. The fixed seat 300 is connected to the end of the stationary tool 100 by a pin 310. The pin 310 passes through the fixed seat 300 and the stationary tool 100 and can be laser welded firmly. Thus, the moving tool 400 can reciprocate in the moving space 5 enclosed by the stationary tool 100 and the fixed seats 300 at both ends of the stationary tool 100.

[0065] like Figure 11 and 12As shown, the comb teeth 140 are disposed on the connecting side plate 110. The connecting side plate 110 includes a main body plate 111 and a composite plate 112. The composite plate 112 is located below the main body plate 111 and is attached to the main body plate 111. One side of the composite plate 112, which is on the same side as the hair inlet end, is aligned and connected to one side of the main body plate 111. The other side of the composite plate 112 is connected to the first side plate 120. In this embodiment, by attaching the main body plate 111 and the composite plate 112 at the hair inlet end of the comb teeth 141, the strength of the hair inlet end of the comb teeth 141 can be improved, thereby enhancing the user experience.

[0066] Furthermore, such as Figure 12 As shown, the lower side of the main body plate 111 located between the first side plate 120 and the second side plate 130 is inclined upward from the second side plate 130 side. The thickness of the main body plate 111 located between the first side plate 120 and the second side plate 130 decreases from the second side plate 130 to the first side plate 120. This can increase the length of hair that is cut and improve the hair cutting effect.

[0067] In addition, a hair cutter is also provided, including a cutter head unit, in which a cutter head assembly for a hair cutter as described above is disposed, and the hair-feeding end of the teeth 141 in the cutter head assembly faces the outer side of the cutter head unit. It should be noted that since the cutter head unit usually has multiple sets of cutter head assemblies arranged side by side for cutting, the aforementioned outer side refers to the two outer ends of the cutter head unit along the direction in which the multiple sets of cutter head assemblies are arranged side by side.

[0068] In this specification, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0069] In the description of this specification, the references to terms such as "preferred embodiment," "another embodiment," "other embodiment," or "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0070] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A cutter head assembly, characterized in that: Includes fixed units and moving units; The fixed unit includes a stationary blade with an inverted U-shaped cross-section. Fixed seats are respectively provided at both ends of the stationary blade. The stationary blade and the fixed seats surround a moving space. The stationary blade and the fixed seats restrict the moving unit in the moving space. The moving unit can reciprocate relative to the fixed unit in the moving space. A comb tooth part is provided on the upper part of the stationary blade. The comb tooth part has a plurality of teeth spaced apart between the two ends of the stationary blade. One end of the teeth is the hair inlet end and the other end is the cutting end. The moving unit includes a blade holder and a moving blade with a cutting rack. The moving blade is fixedly connected to the blade holder, and a bristle-accommodating space is formed between the cutting rack and the blade holder. The cutting teeth are arranged side by side below the comb teeth, and the cutting teeth and the hair-entry ends of the teeth have a first preset distance to form a hair-entry space between them. When the moving unit performs the reciprocating motion relative to the stationary unit, the cutting rack cooperates with the comb teeth to cut hair.

2. The cutter head assembly according to claim 1, characterized in that: The cutting toothed bar is comb-shaped, the moving blade has a long strip-shaped cutting plate surface, the cutting toothed bar is disposed on one side of the cutting plate surface, and the opening of the cutting toothed bar faces the hair inlet end of the tooth; The cutting plate surface is detachably connected to the tool holder, and the cutting plate surface and the top side of the tool holder have a second preset distance.

3. The cutter head assembly according to claim 2, characterized in that: A fixing member extending towards the blade holder is provided on the other side of the cutting plate surface. The blade holder is correspondingly provided with a fixing groove. After the fixing member is inserted into the fixing groove, the cutting plate surface and the blade holder are detachably connected. Alternatively, a fixing groove is provided on the other side of the cutting plate surface, and the tool holder is correspondingly provided with a fixing member extending towards the cutting plate surface. After the fixing member is inserted into the fixing groove, the cutting plate surface and the tool holder are detachably connected.

4. The cutter head assembly according to claim 2, characterized in that: At least one protrusion is provided at intervals along the extension direction of the cutting plate surface on the top side of the blade holder. The protrusion protrudes toward the cutting plate surface and its protrusion height is not greater than the second preset spacing.

5. The cutter head assembly according to claim 4, characterized in that: The top side of the protrusion is an arc surface; And / or, the protrusion is hemispherical.

6. The cutter head assembly according to claim 2, characterized in that: The moving blade also includes a connecting plate. After one side of the connecting plate is connected to the other side of the cutting plate, the cross-section of the two forms an L-shape. The other side of the connecting plate is detachably connected to the blade holder.

7. The cutter head assembly according to claim 6, characterized in that: A slot is provided on the other side of the connecting plate, and a fixing post perpendicular to the slot is provided on one side of the tool holder. After the fixing post is inserted into the corresponding slot, the connecting plate and the tool holder are detachably connected.

8. The cutter head assembly according to claim 7, characterized in that: At least one slot is provided on each side of the folded center line of the connecting plate, and the tool holder is provided with a corresponding fixing post; And / or, the cutting plate surface and the connecting plate surface are an integral folded edge plate; And / or, the two ends of the connecting plate are respectively provided with grooves parallel to the reciprocating motion direction.

9. The cutter head assembly according to claim 1, characterized in that: The stationary blade includes a connecting edge plate and a first side plate and a second side plate located on both sides of the connecting edge plate. The first side plate, the second side plate and the connecting edge plate are integrally bent into the inverted U-shape. The comb teeth are disposed on the connecting side plate. The connecting side plate includes a main plate and a composite plate. The composite plate is attached to the main plate below the main plate, and one side of the composite plate on the same side as the hair inlet end is aligned and connected to one side of the main plate. The other side of the composite plate is connected to the first side plate.

10. The cutter head assembly according to claim 9, characterized in that: The lower side of the main body plate located between the first side plate and the second side plate is inclined upward from the second side plate side, and the thickness of the main body plate located between the first side plate and the second side plate decreases from the second side plate to the first side plate.

11. A hair cutter, comprising a blade unit, characterized in that: The cutter head unit is provided with a cutter head assembly as described in any one of claims 1 to 10, and the bristle inlet end of the teeth in the cutter head assembly faces outward from the cutter head unit.

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