Mounting assembly for hair cutting equipment

Abstract

According to one aspect, a mounting assembly 20 for a hair-cutting device is provided, the mounting assembly comprising: a base 22 and a head 24, the head comprising a body 26 and a drive bridge 28 and configured to house a cutting unit 14. The drive bridge is configured to couple to the cutting unit and reciprocate relative to the body. The mounting assembly further comprises a pivot mechanism 60 disposed between the head and the base and configured to enable pivotal movement of the head relative to the base about a first axis 50 and a second axis 70. The mounting assembly further comprises a drive unit 40 comprising a frame 42 and a drive shaft 44, the drive shaft rotatable relative to the frame about a longitudinal axis of the drive shaft, the frame providing a bearing surface for the drive shaft. The frame comprises a body coupling 54, the body coupling configured to couple to the body of the head and to enable pivotal movement of the head relative to the frame about a body pivot axis parallel to the first axis. The drive unit has a base connection 58 configured to couple to the base and permit pivotal movement of the frame relative to the base about a base axis 62 parallel to the second axis. The drive shaft has an eccentric drive pin 46 at a distal end thereof configured to interact with a drive bridge to induce reciprocating movement of the drive bridge relative to the body of the head. The drive shaft has a socket 48 at a proximal end thereof for engaging the drive head 19 on the motor shaft 18 for rotational transmission.

Description

【Technical Field】 【0001】 The present invention relates to a mounting assembly for a hair cutting device and a hair cutting device. 【Background Art】 【0002】 Hair cutting devices are known that have a head that is pivotable about an axis relative to a handle to follow the contour of an object such as a user's face. Some hair cutting devices have a head that can pivot about two axes relative to the handle, but this configuration creates difficulties in transmitting motion from a motor within the handle to a blade within the head that is pivotable about two different axes in an electric hair cutting device. 【0003】 U.S. Patent Application Publication No. 2018 / 085935 discloses an electric shaver having a first cutter element and a second cutter element, which are reciprocally movable relative to each other along a first horizontal cutter reciprocating axis. Each cutter unit is pivotable about a second horizontal tilting axis and is mounted within a cartridge that is axially displaceable parallel to a vertical axis. The first horizontal cutter reciprocating axis is perpendicular to the vertical axis and perpendicular to the second horizontal tilting axis. The shaver includes a drive shaft that drives one reciprocating motion of the cutter element. 【Summary of the Invention】 【0004】 The present invention provides a mounting assembly for a hair cutting device and a hair cutting device. 【0005】 According to a first particular embodiment, a mounting assembly for a hair cutting device is provided, the mounting assembly comprising: a base and a head, the head having a body and a drive bridge and configured to receive a cutting unit, the drive bridge being coupled to the cutting unit and configured to reciprocate relative to the body; a pivot mechanism positioned between the head and the base and configured to allow the head to rotate (pivot) around a first axis (principal axis) and a second axis (secondary axis) relative to the base; and a drive unit comprising a frame and a drive shaft, the frame being rotatable around the long axis of the drive shaft and providing a bearing surface for the drive shaft. The frame has a body coupling configured to connect to the body of the head and allow rotational movement of the head around a body pivot axis parallel to a first pivot axis relative to the frame, while the drive unit has a base coupling configured to connect to a base and allow rotational movement of the frame around a base axis parallel to a second axis relative to the base, and the drive shaft has an eccentric drive pin at the distal end of the drive shaft configured to interact with a drive bridge to induce a reciprocating motion of the head relative to the body of the drive bridge; and a socket at the proximal end of the drive shaft that engages with a drive head on the motor shaft for rotational transmission. 【0006】 The first axis and the second axis described above may be perpendicular to each other. 【0007】 The frame may have a base connecting portion configured to connect to a base, thereby enabling rotational movement of the frame around the base axis relative to the base. 【0008】 The aforementioned base axis may be a second base axis, and the base connecting portion may be further configured to be coupled to the base and enable rotational movement of the frame around a first base axis parallel to the first axis with respect to the base. 【0009】 The base connecting portion may be further configured to move in a direction away from the head or toward the head. 【0010】 The frame may have a projection that functions as a base connector, the projection being configured to cooperate with a channel in the base extending away from the head to allow rotational movement of the frame around a first base axis relative to the base, as well as translational movement along the slot or channel of the projection. 【0011】 There may be two opposing protrusions, each cooperating with a corresponding opposing channel in the base. These protrusions may be pins configured to cooperate with slots in the base. 【0012】 The base connecting portion may be configured such that the pin of the base connecting portion is positioned in a slot, and the pin can be translated along the slot to adapt to the rotational motion of the head around the first axis, and can also be translated in and out of the slot to enable rotational motion around the second base axis. 【0013】 The two opposing protrusions can define a curved surface in a plane perpendicular to the first axis, and this curved surface abuts against the channel at its boundary, enabling rotational movement of the base connecting portion around the first base axis. 【0014】 The base connecting portion may have a gap between the frame and the base, which does not hinder rotational movement around the second base axis, thereby enabling rotational movement around the second base axis. 【0015】 The pivot mechanism may have a four-bar linkage mechanism with two arms rotatably positioned between the head and the base, such that the head, base, and each of the arms become one arm of the four-bar linkage mechanism, and the first axis becomes a virtual axis. 【0016】 The frame may be provided with a pair of opposing body connecting parts, which are configured to allow rotational movement of the frame around a body pivot axis passing through both body connecting parts relative to the head of the frame. 【0017】 Each of the frame's main body connecting portions may have an arm, each arm having a pin or hole at its far end, the pin or hole cooperating with a corresponding hole or pin in the head's body to enable rotational movement around a pivot axis of the body passing through the pin and hole, and the arm is configured to be held so as to press against the corresponding pin and hole under pre-tension. 【0018】 The frame can be suspended from the main body of the head at the main body connection point. 【0019】 A hair cutting device is provided comprising a mounting assembly according to the first embodiment and a handle fixed to the base of the mounting assembly, wherein the handle has a motor for rotating a long motor shaft, the long motor shaft having a drive head at its distal end, the drive head being coupled to a socket of the drive shaft of the mounting assembly and configured to transmit rotational motion from the motor shaft to the drive shaft, and to form an articulated joint configured to allow rotational motion between the motor shaft and the drive shaft. 【0020】 The above and other embodiments will become apparent from the embodiments described later and will be explained with reference to such embodiments. 【0021】 Exemplary embodiments will be described, merely as examples, with reference to the following drawings. [Brief explanation of the drawing] 【0022】 [Figure 1] Figure 1 shows a schematic isometric view of a hair cutting device. [Figure 2A] Figure 2A shows a side view of the mounting assembly of the first example in the neutral position. [Figure 2B]Figure 2B shows a cross-sectional view of the mounting assembly of the first example in the neutral position. [Figure 3A] Figure 3A shows a side view of the mounting assembly of the first example in the first contour-following position. [Figure 3B] Figure 3B shows a cross-sectional view of the mounting assembly of the first example in the first contour-following position. [Figure 4A] Figure 4A shows a side view of the mounting assembly of the first example in the second contour-following position. [Figure 4B] Figure 4B shows a cross-sectional view of the mounting assembly of the first example in the second contour-following position. [Figure 5] Figure 5 schematically shows an isometric cutaway view of the mounting assembly of the second example. [Figure 6] Figure 6 schematically shows a cross-sectional view of the mounting assembly of the third example. [Figure 7] Figure 7 schematically shows an isometric view of the drive unit of the mounting assembly of the third example. DETAILED DESCRIPTION OF THE INVENTION 【0023】 Figure 1 shows a hair cutting device 10 including a handle 12, a mounting assembly 20 fixed to the handle 12, and a cutting unit 14 received on the mounting assembly 20. The mounting assembly 20 is configured to enable a pivoting movement of the cutting unit 14 about a first axis (main axis) 50 with respect to the handle 12. The mounting assembly 20 further enables a pivoting movement of the cutting unit 14 about a second axis (secondary axis) 70 with respect to the handle 12. The second axis 70 is perpendicular to the first axis 50, and as a result, the cutting unit 14 is pivotable about two orthogonal axes with respect to the handle 12. 【0024】 In this example, the first axis 50 and the second axis 70 are skew lines (i.e., these lines do not intersect and are not parallel). In some examples, the first axis and the second axis can be orthogonal (i.e., these lines are perpendicular and can intersect). In other examples, the first axis and the second axis are neither perpendicular nor parallel. 【0025】 In this example, the handle 12 includes a motor 16 for rotating a long motor shaft 18 around its long axis. The motor shaft 18 has a drive head 19 at its distal end, which is coupled to a mounting assembly 20 and configured to transmit rotational motion from the motor shaft 18 to a portion of the mounting assembly 20. 【0026】 Figure 2A shows a side view of the mounting assembly 20 of the first example in the neutral position, and Figure 2B shows a cross-sectional view of the mounting assembly of the first example in the neutral position. Figures 3A and 3B show the same diagrams as Figures 2A and 2B, respectively, but the mounting assembly 20 is in a first contour-following position in which the cutting unit 14 has been rotated from the neutral position around the first axis 50 relative to the handle 12. Figures 4A and 4B also show the same diagrams as Figures 2A and 2B, respectively, but the mounting assembly 20 is in a second contour-following position in which the cutting unit 14 has been rotated from the neutral position around the second axis 70 relative to the handle 12. 【0027】 The mounting assembly 20 comprises a base 22 configured to be attached to the handle 12, and a head 24 configured to house a cutting unit 14 (not shown in Figures 2A to 4B), such as a blade. The head 24 comprises a body 26 and a drive bridge 28 (shown in Figures 2B, 3B, and 4B). The drive bridge 28 is configured to reciprocate in translational motion relative to the body 26 and to be coupled to the cutting unit 14. Therefore, when coupled to the drive bridge 28, the cutting unit 14 can also reciprocate in plane relative to the body 26. The body 26 may be equipped with opposing blades so that the cutting unit 14 can cut hair together with the opposing blades on the body 26. 【0028】 The rotation mechanism 60 is positioned between the base 22 and the head 24 and is configured to allow rotational movement of the head 24 around the first axis 50 and the second axis 70 relative to the base 22. 【0029】 In this example, the pivot mechanism comprises a pair of arms 30 rotatably positioned between a base 22 and a head 24. In other words, each arm 30 is rotatably coupled to the base 22 at one end and to the head 24 at the other end, forming a four-bar linkage mechanism such that the head 24 forms one bar, the base 22 forms one bar, and each arm 30 forms one bar. The four-bar linkage mechanism allows the head 24 to rotate around a first axis 50, which is a virtual axis of the head 24 opposite to the arms 30. 【0030】 In this example, each arm 30 has two branching strands (elements) 30a and 30b to form a U-shape, and both ends of each U-shape are connected to the head 24. Thus, the head 24 is supported at a total of four points by the arms 30. The vertices of each U-shaped arm are connected to the base 22 using ball socket joints (not shown), further enabling the integrated rotational movement of the arms 30 and the head 24 around the second axis 70 relative to the base. Thus, when the four-bar linkage mechanism rotates around the second axis 70, the first axis 50 also moves around the second axis 70. 【0031】 In other examples, each arm may have a single strand to form an I-shape, such that the head is supported by the arm at only two points in total, or the arm may have three or more branching strands, such that the head is supported by the arm at three or more points per arm. Each arm may also have a different number of branching strands to support the head at, for example, three or five points. In yet another example, the arm may have two branching strands in the form of a T, V, or Y shape, such that each arm supports the head at two points. The arm may also be reversed, such that a ball-socket joint is located between the arm and the head. 【0032】 It will be understood that the pivot mechanism may also include any suitable pivot mechanism that allows the head to rotate around two different axes relative to the handle. In some examples, the pivot mechanism may have, instead of a four-bar linkage mechanism, a simple pivot between the head and the base to allow the head to rotate around a first axis relative to the base, and another simple pivot between the head and the base to allow the head to rotate around a second axis relative to the base. In other examples, the pivot mechanism may also include a ball-socket joint that allows the head to rotate simultaneously around both the first and second axes. 【0033】 The mounting assembly 20 further comprises a drive unit 40 configured to produce reciprocating motion of the drive bridge 28. The drive unit 40 comprises a frame 42 and a drive shaft 44. 【0034】 The drive shaft 44 extends along the long axis 45 and is equipped with an eccentric drive pin 46 at its distal end, which is offset from the long axis 45. The eccentric drive pin 46 is configured to interact with the drive bridge 28 to produce a reciprocating motion of the drive bridge 28 relative to the body 26. In other words, the drive bridge 28 is equipped with a channel in which the eccentric drive pin 46 is loosely housed, allowing the drive pin 46 to move freely back and forth within the channel. Therefore, the rotation of the drive shaft 44 induces a circular motion of the drive pin 46, which in turn transmits linear motion to the drive bridge 28. The drive pin 46 is freely movable along the channel because it pushes the channel back and forth in a direction perpendicular to its direction of extension. 【0035】 The drive shaft 44 further includes a socket 48 at its proximal end for engaging with a drive head 19 on the motor shaft 18 within the handle 12 for rotational transmission. Thus, the rotational motion of the drive shaft 44 (around its long axis 45), transmitted from the motor shaft 18 to the drive shaft 44 via the socket 48, is converted into reciprocating linear motion of the drive bridge 28 through the interaction of the eccentric pin 46 with the drive bridge 28. 【0036】 The socket 48 is configured to engage with the drive head 19 of the motor shaft 18 so that the motor shaft 18 and the drive shaft 44 can rotate relative to each other up to 30 degrees, while still transmitting rotational motion from the motor shaft to the drive shaft 44. Such a coupling is described in U.S. Patent Application Publication 2003 / 019107, which is incorporated herein by reference. 【0037】 The body 26 of the head 24 protrudes toward the base 22 and has a stroke limiter 27 configured to contact the arm 30 of the four-bar linkage mechanism when the head 24 is rotated approximately 20 degrees around the first axis 50 in any direction from the neutral position as shown in Figure 3A. This prevents the drive shaft 44 from rotating more than 30 degrees relative to the motor shaft 18 and ensures that they do not separate. In some examples, it will be understood that the stroke limiter may be configured to contact the arm at any appropriate angle. In other examples, the stroke limiter may not be present, or it may be located on the base and configured to contact the arm, or it may be located on the arm and configured to contact the head or the base. 【0038】 The base 22 is provided with a pair of locking portions 29, each projecting toward the head 24. Each locking portion 29 is configured to contact the body 26 when the head 24 is rotated approximately 8 degrees around the second axis 70 in both directions from the neutral position, as shown in Figure 4B. This configuration also prevents the drive shaft 44 from rotating more than 30 degrees relative to the motor shaft 18 and ensures that they do not separate. In some examples, it will be understood that each locking portion can be configured to contact the body at any appropriate angle. In other examples, the locking portions may be absent, or they may be configured to contact the arms of the four-bar linkage mechanism, or they may be located on the arms or head and also contact the base. 【0039】 Therefore, the combination of motion around both the first shaft 50 and the second shaft 70 can be performed without separating the drive shaft 44 and the motor shaft 18, since the motion around both shafts is constrained. 【0040】 The frame 42 surrounds at least a portion of the drive shaft 44 and is rotatable about the drive shaft 44 around its long axis 45. The frame 42 provides a bearing surface 52 for the drive shaft 44 to rotate relative to the frame 42. 【0041】 The frame 42 is provided with a pair of main body connecting parts 54 on both sides of its distal end, and these main body connecting parts 54 are connected to the main body 26 of the head 24, enabling rotational movement of the head 24 around the main body pivot axis 56 (which is parallel to the first axis 50) relative to the frame 42. 【0042】 In this example, each body connecting portion 54 has an arm 72 that extends toward the body 26 and has a hole, which cooperates with a pin in the body 26. In other examples, each arm may also have a pin that cooperates with a corresponding hole in the body. 【0043】 In this example, the main body pivot shaft 56 passes through both main body connecting parts 54 (i.e., through both holes and pins). In other examples, there may be only a single main body connecting part that rotatably connects the frame to the body of the head. In this example, the arm 72 of the frame 42 is held under pre-tension to push the pin of the body 26 into the hole of the main body connecting part 54. Thus, such pre-tension eliminates the need for other types of fastening means, such as screws, to the frame and body with high reliability, and eliminates any play between the body 26 and the frame 42 that would otherwise lead to a loss of effective stroke of the cutting unit 14. Thus, the arm with pre-tension improves ease of assembly. 【0044】 In this example, the frame 42 also includes a pair of opposing base connecting parts 58, which are connected to the base 22 and configured to allow rotational movement of the frame 42 about a first base axis 61 parallel to the first axis 50 and a second base axis 62 parallel to the second axis 70 with respect to the base. In this example, the second base axis 62 is the same as the second axis 70. In other examples, the second base axis may not be the same as the second axis. 【0045】 The frame 42 is provided with a pair of pin-shaped projections that function as base connectors 58. These pins are received in corresponding opposing slots 64 of the base 22, which extend away from the head 24. The pins cooperate with the slots 64 to allow translational motion of the pins along each slot 64 away from and towards the head 24. The pins also cooperate with the slots 64 to allow rotational motion of the frame 42 around a first base axis 61 through both pins relative to the base. The pins also allow motion around a second base axis 62 by moving inward and outward within the slots 64 and translating along the slots 64, as shown in Figure 4B. 【0046】 In some examples, only a single base connector exists, which may enable rotational motion of the frame only about a second base axis relative to the base. For example, in cases where the motion of the head around the first axis is facilitated by a simple rotation mechanism, the base connector may not need to enable rotational motion around the first base axis, since the motion of the head around the first axis is already taken into account by the base connector. In some examples, the base connector may be located in other parts of the drive unit, such as a drive shaft, as shown in Figure 5. 【0047】 The frame 42 of the drive unit 40 is coupled to the head 24 by a body pivot axis 56, and since the body pivot axis 56 is not collinear with the first axis 50 on which the head 24 rotates relative to the body 26, when the head 24 rotates about the first axis 50, the base coupling portion 58 also moves parallel to the base 22. The slots 64 that enable the translational motion of the pins thus absorb the rotational motion of the head 24 around the first axis 50 relative to the base 22 by enabling the translational motion of these pins. To adapt to such motion, the frame 42 is suspended from the body 26 of the head 24 at the body coupling portion 54 (i.e., it is not directly fixed or attached to the base 22). In other words, the base coupling portion 58 is not directly fixed to the base 22 but is constrained to move along the slots 64, so that the frame 42 is simply attached to the body 26 of the head 24. 【0048】 Furthermore, the socket 48 of the drive shaft 44 will also move in translation due to the difference between the main pivot shaft 56 and the first shaft 50, and due to its connection to the frame 42. Thus, the socket 48 is configured to adapt to such translational motion relative to the motor shaft 18, while remaining coupled to the motor shaft 18. This is because the motor shaft 18 does not move relative to the handle 12 and therefore remains stationary relative to the base 22. In other examples, the frame and the drive shaft can be configured to translate relative to each other, so that the translational movement of the frame relative to the base due to the rotational motion of the head around the first shaft does not mean that the drive shaft also moves relative to the base. 【0049】 Furthermore, the base 22 and slot 64 have sufficient depth to allow the pin to move inward and outward within the slot 64, thereby enabling rotational movement of the frame around the second base axis 62, which in turn enables rotational movement of the head 24 around the second axis 70. 【0050】 Therefore, in Figures 2A and 2B, when the mounting assembly 20 is in the neutral position, the pins of the base connecting portion 58 are located in the center of the slot 64, and there is space for each pin to translate along the slot 64 toward and toward the head 24, as well as space for each pin to move inward and outward within the slot 64. 【0051】 In Figures 3A and 3B, the mounting assembly 20 is positioned so that the head 24 is rotated from a neutral position around the first axis 50 to a first contour-following position, and the pins are slightly translated along the slot 64 to adapt to the rotational motion of the head 24 around the first axis 50. 【0052】 In Figures 4A and 4B, the mounting assembly 20 is in a second contour-following position, where the head 24 has been rotated from a neutral position around the second axis 70. The movement of the head 24 around the second axis 70 results in the movement of the frame 42 around the second base axis 62, causing one pin to move outward from its corresponding slot 64 and the other opposing pin to move further inward into its corresponding slot 64. In this example, it can be seen that the longitudinal expansion of the slot 64 allows for further rotational movement of the frame 42 around the second base axis 62. 【0053】 While it has been explained that the base has slots that receive and cooperate with projections on the frame, in other examples, these slots may instead be channels that do not extend across the thickness of the base. 【0054】 Figure 5 shows a mounting assembly 120 of a second example, which is similar to the mounting assembly 20 of the first example in that it comprises a head 24, a base 122, and a pivot mechanism 60 in the form of a four-bar linkage mechanism having arms 30 configured to allow the head 24 to rotate around a first axis 50 and a second axis 70 relative to the base 122. The base 122 in this example differs from the base 22 of the first example in that it does not have slots. 【0055】 The mounting assembly 120 of the second example includes a drive unit 140 similar to the drive unit 40 of the mounting assembly 20 of the first example. Specifically, the drive unit 140 of this example includes a frame 142 and a drive shaft 144, the frame 142 being rotatable relative to the drive shaft 144 and providing a bearing surface 152 for the drive shaft 144. The frame 142 includes a body connector 54 similar to the body connector 54 of the mounting assembly 20 of the first example, the connector rotatably connects the frame 142 to the body 26 of the head 24. The frame 142 of this example differs from the frame 42 of the first example in that it does not include a base connector. 【0056】 The drive unit 140 in this example differs from the drive unit 40 of the mounting assembly 20 in the first example in that the drive shaft 144 has a bearing with a curved outer surface and is hollowed out at one end to form a socket 48, similar to the socket of the first mounting assembly 20. The curved outer surface functions as a base coupling portion 158 configured to allow rotational movement of the frame 142 around the first base shaft 61 and the second base shaft 62 relative to the base 122, and these base shafts are parallel to the first shaft 50 and the second shaft, respectively, as in the mounting assembly 20 of the first example. The base coupling portion 158 in this example thus essentially forms the ball of a ball socket joint, and the base 122 has a hole to receive the base coupling portion 158 and allow rotational movement of the drive shaft 144 around the first base shaft 61 and the second base shaft 62, and thus rotational movement of the head 24 around the first shaft 50 and the second shaft 70 relative to the base 122. 【0057】 Since there are no protrusions on the curved outer surface of the base connecting portion 158, the base 122 does not require a channel or slot to receive such protrusions. 【0058】 Figure 6 shows a mounting assembly 220 of a third example, which is similar to the mounting assembly 20 of the first example and the mounting assembly 120 of the second example in that it comprises a head 24, a base 222, and a pivot mechanism 60 in the form of a four-bar linkage mechanism having arms 30 configured to allow rotational movement of the head 24 around a first axis 50 and a second axis 70 relative to the base 222. The base 222 in this example differs from the base 22 of the first example in that it has channels extending away from the head 24 instead of through slots 64. 【0059】 The mounting assembly 220 of the third example includes a drive unit 240, also shown in Figure 7, which is similar to the drive unit 40 of the mounting assembly 20 of the first example. That is, the drive unit 240 of this example has a frame 242 and a drive shaft 44, the frame 242 is rotatable relative to the drive shaft 44 and provides a bearing surface 252 relative to the drive shaft 44. The drive shaft 44 is similar to the drive shaft 44 in the mounting assembly 20 of the first example. 【0060】 Frame 242 has two arms 72, each having a body connector 54 similar to the body connector 54 of the mounting assembly 20 in the first example, which rotatably connects frame 242 to the body 26 of head 24. Frame 242 in this example differs from frame 42 in the first example in that it has a base connector 258 having a different projection relative to the pin. 【0061】 The drive unit 240 in this example differs from the drive unit 40 of the mounting assembly 20 in the first example in that two opposing projections on the frame 242, which function as a base coupling portion 258, each define a curved surface in a plane perpendicular to the first axis 50 (for example, the cross-section shown in Figure 6). These projections abut against the channels in the base 222 at their boundaries, thus enabling rotational movement of the base coupling portion 258 around the first base axis 61 parallel to the first axis 50, as well as translational movement of the base coupling portion 258 along the channels. 【0062】 The base connecting portion 258 has a gap 280 (best shown in Figure 7) between the frame 242 and the base 222 so as not to hinder the rotational movement of the frame 242 relative to the base 222 about the second base axis 62, thereby enabling the rotational movement of the frame 242 relative to the base 222 about the second base axis 62. 【0063】 Therefore, each of the above examples enables rotational motion of the head around the first axis 50 and the second axis 70, and connects the drive units 40, 140, and 240 to the head 24 and bases 22, 122, and 222, enabling rotational motion around the main pivot axis 56, the first base axis 61, and the second base axis 62. 【0064】 Variations of the disclosed embodiments can be understood and implemented by those skilled in the art who practice the principles and techniques described herein, by examining the drawings, this disclosure, and the appended claims. In the claims, the word "including" does not exclude other elements or steps, and the singular form does not exclude the plural. The mere fact that certain means are described in different dependent claims does not imply that combinations of these means cannot be used advantageously. No reference numeral in the claims should be construed as limiting the scope.

Claims

[Claim 1] A mounting assembly for a hair cutting device, the mounting assembly comprises, A base and a head, wherein the head has a body and a drive bridge and houses a cutting unit, and the drive bridge is coupled to the cutting unit and reciprocates relative to the body, A rotation mechanism disposed between the head and the base, enabling rotational movement of the head around a first axis and a second axis relative to the base, wherein the first axis is an axis along the longitudinal direction of the head, the second axis passes through the base, and the first axis and the second axis are perpendicular to each other. A drive unit comprising a frame and a drive shaft, wherein the frame is rotatable around the long axis of the drive shaft and provides a bearing surface for the drive shaft. It has, The frame has a body connecting portion that connects to the body of the head and enables rotational movement of the head around a body pivot axis parallel to the first axis with respect to the frame, while the drive unit has a base connecting portion that connects to the base and enables rotational movement of the frame around a base axis parallel to the second axis with respect to the base. The aforementioned drive shaft, An eccentric drive pin at the distal end of the drive shaft, which interacts with the drive bridge to induce a reciprocating motion of the head relative to the body in the drive bridge, A socket at the proximal end of the drive shaft engages with the drive head on the motor shaft for rotational transmission. A mounting assembly having [Claim 2] The mounting assembly according to claim 1, wherein the frame has a base connecting portion that is coupled to the base and enables rotational movement of the frame around the base axis relative to the base. [Claim 3] The aforementioned base shaft is a second base shaft, The base connecting portion is further connected to the base, enabling rotational movement of the frame around a first base axis parallel to the first axis relative to the base. The mounting assembly according to claim 1 or claim 2. [Claim 4] The mounting assembly according to claim 3, wherein the base connecting portion further moves in parallel in a direction away from the head or toward the head. [Claim 5] The mounting assembly according to claim 2, wherein the frame has a projection that functions as the base connecting portion, the projection cooperating with a slot or channel in the base extending away from the head, thereby enabling rotational movement of the frame around a first base axis relative to the base, and enabling translational movement of the projection along the slot or channel. [Claim 6] The mounting assembly according to claim 5, wherein there are two opposing protrusions, each cooperating with a corresponding opposing channel in the base. [Claim 7] The mounting assembly according to claim 5, wherein the projection is a pin that cooperates with a slot in the base. [Claim 8] The mounting assembly according to claim 7, wherein the base connecting portion is arranged such that the pin of the base connecting portion is positioned in the slot and the pin can be translated along the slot to adapt to the rotational movement of the head around the first axis, and can be translated in and out of the slot to enable rotational movement around the second base axis. [Claim 9] The mounting assembly according to claim 6, wherein the two opposing protrusions define a curved surface in a plane perpendicular to the first axis, the curved surface abuts the channel at its boundary, and the base connecting portion is able to rotate around the first base axis. [Claim 10] The mounting assembly according to claim 9, wherein the base connecting portion has a gap between the frame and the base so as not to hinder rotational movement around the second base axis, thereby enabling rotational movement around the second base axis. [Claim 11] The mounting assembly according to claim 4, wherein the rotating mechanism has a four-bar linkage mechanism comprising two arms rotatably positioned between the head and the base, and the head, the base, and each of the arms become one arm of the four-bar linkage mechanism, and the first axis becomes a virtual axis. [Claim 12] The mounting assembly according to claim 1, wherein the frame comprises a pair of opposing body connecting portions, which enable rotational movement of the frame around the body pivot axis passing through both body connecting portions relative to the head. [Claim 13] The mounting assembly according to claim 12, wherein each of the main body connecting portions of the frame has an arm, each arm having a pin or hole at a far end position, the pin or hole cooperates with a corresponding hole or pin in the main body of the head to enable rotational movement around the main body pivot axis passing through the pin and hole, and the arm is held so as to press against the corresponding pin and hole under pre-tension. [Claim 14] The mounting assembly according to claim 1, wherein the frame is suspended from the main body of the head at the main body connecting portion. [Claim 15] A hair cutting device comprising a mounting assembly as described in claim 1 and a handle fixed to the base of the mounting assembly, wherein the handle has a motor for rotating a long motor shaft, the long motor shaft has a drive head at its distal end, and the drive head is coupled to the socket of the drive shaft of the mounting assembly to form an articulated joint that transmits rotational motion from the long motor shaft to the drive shaft and enables rotational motion between the long motor shaft and the drive shaft.