Upper lip movement mechanism, lip movement mechanism and mouth device

Abstract

The utility model relates to the technical field of robots, in particular to an upper lip movement mechanism, a lip movement mechanism and a mouth device, which comprise a first driving structure and a connecting component, and the first driving structure is connected with an upper lip through the connecting component so as to drive the upper lip to move along a preset route; the connecting assembly comprises a first connecting rod, an under-actuated connecting piece and an upper lip connector, the first connecting rod is rotatably arranged in the first direction and connected to the output end of the first driving structure, and the first driving structure drives the first connecting rod to rotate in the first direction; the output end of the first connecting rod is rotationally connected with the input end of an under-actuated connecting piece, the output end of the under-actuated connecting piece is rotationally connected with the input end of an upper lip connector, and the output end of the upper lip connector is connected with an upper lip. Through the arrangement of the under-actuated rotating shaft, the upper lip connected by the upper lip connector is more natural when moving up and down, so that higher-level movement of bionic human lips is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of robots, in particular to an upper lip movement mechanism, a lip movement mechanism and a mouth device. Background Art

[0002] As bionic robots gradually mature, the requirements for them are no longer just to be able to perform some simple, rigid basic movements; instead, they pursue movements that are close to the natural movements of humans. For example, the lip designs of existing bionic robots mostly use a wire-driven structure, and the lips can only perform simple stretching movements, and cannot achieve complex curve movements or natural eversion movements, which lacks realism. In this case, an upper lip movement mechanism is designed to address this defect. Utility Model Content

[0003] In order to solve the problem that the upper lip movement of existing robots is simple and unnatural, the utility model provides an upper lip movement mechanism, a lip movement mechanism and a mouth device.

[0004] The technical solution of the utility model is:

[0005] In one aspect, the present invention provides an upper lip movement mechanism, characterized by comprising a first driving structure;

[0006] Connecting components, including

[0007] a first connecting rod, rotatably arranged along a first direction and connected to an output end of the first driving structure;

[0008] an under-actuated connecting piece, wherein an input end of the under-actuated connecting piece is rotatably connected to an output end of the first connecting rod;

[0009] An upper lip connector, wherein the input end of the upper lip connector is rotatably connected to the output end of the under-driven connecting piece; and the output end of the upper lip connector is connected to the upper lip.

[0010] Furthermore, the upper lip connector includes an upper lip connecting seat, a first connecting member and a second connecting member; the upper lip connecting seat is rotatably connected to the output end of the under-driven connecting piece; the first connecting member is arranged on the upper lip connecting seat, the first connecting member is detachably connected to the second connecting member, and the second connecting member is connected to the upper lip.

[0011] Furthermore, one of the first connecting member and the second connecting member is a boss structure, and the other is a groove structure, and the first connecting member and the second connecting member are connected by magnetic attraction.

[0012] Furthermore, the first driving structure includes a first motor, a second connecting rod and the third connecting rod, the first motor is arranged in the symmetrical center area opposite the upper lip; the input end of the second connecting rod is connected to the output end of the first motor, the input end of the third connecting rod is connected to the output end of the second connecting rod, and the output end of the third connecting rod is rotationally connected to the first connecting rod.

[0013] Furthermore, the upper lip movement mechanism is arranged on the maxillary model; the maxillary model has an alveolar bone protruding toward the outside of the upper lip; the under-actuated connecting piece and the upper lip connector can contact the convex surface of the alveolar bone facing the inner side of the upper lip.

[0014] Furthermore, the first end of the first connecting rod is rotatably connected to the symmetrical center position of the maxillary model, and the second end of the first connecting rod is rotatably connected to the under-actuated connecting piece.

[0015] According to another aspect of the present invention, a lip movement mechanism is provided, comprising the upper lip movement mechanism as described above, a lower lip movement mechanism, and a mandibular model, wherein the connection position of the lower lip movement mechanism is located at the bottom of the mandibular model.

[0016] Furthermore, the lower lip movement mechanism includes a second driving structure, a connecting rod assembly and a lower lip connector; the second driving structure is installed at the bottom of the mandibular model, and the output end of the second driving structure is connected to the input end of the connecting rod assembly; the output end of the connecting rod assembly is rotated to connect to the lower lip connector to drive it to move tilted upward or tilted downward, and the lower lip connector is connected to the lower lip.

[0017] Furthermore, the connecting rod assembly includes a fourth connecting rod, a fifth connecting rod and a sixth connecting rod that are rotatably connected to each other in sequence, and the sixth connecting rod is rotatably connected to the lower lip connector; the mandibular model has an inclined guide portion, and the sixth connecting rod is suitable for guiding and moving along the guide portion.

[0018] According to another aspect of the present invention, a mouth device is also provided, comprising the lip movement mechanism as described above, a mouth corner movement mechanism for driving the mouth corners to move, an upper lip, a lower lip and a mouth corner; the upper lip, the lower lip and the mouth corners are connected to each other.

[0019] The beneficial effects achieved by the utility model are:

[0020] The upper lip movement mechanism of the present invention is used to control the movement of the upper lip, and includes a first driving structure and a connecting assembly. The first driving structure is connected to the upper lip through the connecting assembly to drive the upper lip to move along a preset route; the connecting assembly includes a first connecting rod, an under-driven connecting piece and an upper lip connector. The first connecting rod is rotatable along a first direction and is connected to the output end of the first driving structure to drive the first connecting rod to rotate along the first direction through the first driving structure; the output end of the first connecting rod is rotationally connected to the input end of the under-driven connecting piece, and the output end of the under-driven connecting piece is rotationally connected to the input end of the upper lip connector, and the output end of the upper lip connector is connected to the upper lip; since the first driving structure is directly connected to the first connecting rod to drive it, The motion trajectory of the first connecting rod is fixed; the under-actuated connecting piece and the first connecting rod are rotationally connected, and the under-actuated connecting piece and the upper lip connector are also rotationally connected, and are not directly affected by the driving force. Therefore, it is equivalent to setting under-actuated rotating shafts between the under-actuated connecting piece and the first connecting rod and between the under-actuated connecting piece and the upper lip connector, and the upper lip connector is connected to the flexible upper lip; therefore, it can be understood that the setting of the double under-actuated rotating shafts makes the upper lip connected by the upper lip connector more natural when moving up and down, so as to achieve a higher level of bionic human lip movement; it can also complete more complex movements with the cooperation of other part motion structures (such as lower lip motion mechanism, mouth corner motion mechanism). BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0023] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of Example 1 of the present application;

[0025] Figure 2 This is a side structural diagram of Example 1 of the present application;

[0026] Figure 3 This is a schematic diagram of the first three-dimensional structure of the lower lip movement mechanism in the second embodiment of the present application;

[0027] Figure 4 This is a second three-dimensional structural diagram of the lower lip movement mechanism in the second embodiment of the present application;

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of Example 3 of the present application.

[0029] In the figure,

[0030] 100. Connecting assembly; 200. First driving structure; 300. Maxillary model; 400. Lower lip movement mechanism; 500. Mandibular model; 110. First connecting rod; 120. Under-actuated connecting plate; 130. Upper lip connector; 131. Upper lip connector; 132. First connecting member; 133. Second connecting member; 210. First motor; 220. Second connecting rod; 230. Third connecting rod; 310. Alveolar bone; 410. Second driving structure; 420. Connecting rod assembly; 421. Fourth connecting rod; 422. Fifth connecting rod; 423. Sixth connecting rod; 430. Lower lip connector; 510. Guide portion. DETAILED DESCRIPTION

[0031] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0032] The disclosure below provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and settings of specific examples are described below. Of course, these are merely examples and are not intended to limit the present application. In addition, the present application may repeat reference numbers and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0033] For ease of description, spatially relative terms may be used herein to describe the relative position or movement of an element or feature relative to another element or feature as shown in the figures, such as "inside", "outside", "inside", "outside", "below", "beneath", "above", "above", "front", "back", etc. Such spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation depicted in the figures. For example, if the device in the figures undergoes a position flip or a change in posture or a change in motion state, then these directional indications will also change accordingly. For example, an element described as "below" or "below" another element or feature will then be oriented as "above" or "above" another element or feature. Thus, the example term "below" can include both above and below orientations. The device can be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein will be interpreted accordingly.

[0034] Example 1

[0035] An embodiment of the present application shows an upper lip movement mechanism for controlling the movement of the upper lip, including a first driving structure 200 and a connecting assembly 100. The first driving structure 200 is connected to the upper lip through the connecting assembly 100, thereby driving the upper lip to move along a preset route; the connecting assembly 100 includes a first connecting rod 110, an under-driven connecting piece 120 and an upper lip connector 130. The first connecting rod 110 is rotatably arranged along a first direction A and is connected to the output end of the first driving structure 200 to drive the first connecting rod 110 to rotate along the first direction A through the first driving structure 200; the output end of the first connecting rod 110 is rotationally connected to the input end of the under-driven connecting piece 120, the output end of the under-driven connecting piece 120 is rotationally connected to the input end of the upper lip connector 130, and the output end of the upper lip connector 130 is connected to the upper lip.

[0036] In this embodiment, if Figure 1-2 As shown, the first driving structure 200 can drive the first connecting rod 110 to move in a first direction A (see FIG. Figure 2 ) forward or reverse; an example is given below, from Figure 2From the perspective of the invention, the first connecting rod 110 is driven to rotate upward or downward respectively; when the first connecting rod 110 rotates upward, the under-actuated connecting piece 120, the upper lip connector 130 and the upper lip are driven to move upward; when the first connecting rod 110 rotates downward, the under-actuated connecting piece 120, the upper lip connector 130 and the upper lip are driven to move downward. It should be noted here that the first driving structure 200 is directly connected to the first connecting rod 110 to drive it, so the motion trajectory of the first connecting rod 110 is fixed; the under-actuated connecting piece 120 and the first connecting rod 110 are rotationally connected, and the under-actuated connecting piece 120 and the upper lip connector 130 are also rotationally connected, and are not directly affected by the driving force. Therefore, it is equivalent to the under-actuated connecting piece 120 and the first connecting rod 110, the under-actuated connecting piece 120 and the upper lip connector 130. An under-driven rotating shaft is respectively provided between the dynamic connecting piece 120 and the upper lip connector 130, and the upper lip connector 130 is connected to the flexible upper lip; therefore, the movement trajectory of the under-driven connecting piece 120 and the upper lip connector 130 will be affected by other tissues and organs near the lips, thereby causing movement that adapts to the shape of the tissues and organs themselves; that is, it can be understood that the setting of the double under-driven rotating shaft makes the upper lip connected to the upper lip connector 130 more natural when moving up and down, so as to achieve a higher level of bionic human lip movement; it can also complete more complex movements with the cooperation of other parts of the movement structure (such as the lower lip movement mechanism, the corner of the mouth movement mechanism); for example, it can complete the eversion movement of the upper lip while the corner of the mouth is retracted, etc., rather than just being able to achieve a simple up and down stretching movement.

[0037] In an optional embodiment, the upper lip connector 130 includes an upper lip connecting seat 131, a first connecting member 132 and a second connecting member 133; the upper lip connecting seat 131 is rotatably connected to the output end of the under-driven connecting piece 120; a first connecting member 132 is provided on the upper lip connecting seat 131, and the first connecting member 132 and the second connecting member 133 are detachably connected; the second connecting member 133 is connected to the upper lip.

[0038] In this embodiment, by setting the first connecting member 132 and the second connecting member 133 as a detachable connection, the repair and maintenance of the upper lip model or other parts connected thereto can be facilitated; optionally, the second connecting member 133 and the upper lip are adhesively connected; optionally, the side of the second connecting member 133 facing the upper lip is a flat surface or a protruding contour surface, and its area can be appropriately increased to increase the contact area between the second connecting member 133 and the upper lip and improve the stability of the connection between the two; optionally, the first connecting member 132 is fixed on the upper lip connecting seat 131 or is integrally formed with it.

[0039] In an optional embodiment, one of the first connecting member 132 and the second connecting member 133 is a boss structure, and the other is a groove structure, and the first connecting member 132 and the second connecting member 133 are connected by magnetic attraction.

[0040] In this embodiment, the first connecting member 132 and the second connecting member 133 can be quickly connected and disassembled through the magnetic connection, which makes the operation easier. The matching structure of the boss and the groove can play the following roles: first, it plays a positioning and guiding role; second, it increases the adsorption area between the first connecting member 132 and the second connecting member 133, thereby providing greater suction force to make the connection between the first connecting member 132 and the second connecting member 133 more secure and not easy to loosen.

[0041] In an optional embodiment, the first driving structure 200 includes a first motor 210, a second connecting rod 220 and a third connecting rod 230, the input end of the second connecting rod 220 is connected to the output end of the first motor 210, the input end of the third connecting rod 230 is connected to the output end of the second connecting rod 220, and the output end of the third connecting rod 230 is rotatably connected to the first connecting rod 110 (such as Figure 2 As shown); the rotation range of the first connecting rod 110 can be better controlled by setting the second connecting rod 220 and the third connecting rod 230; and since the first connecting rod 110 usually needs to be set at a position facing the middle of the upper lip, if the motor is directly connected to one end of the first connecting rod 110, the problem of poor structural layout balance will occur; as shown Figure 1-2 As shown, the second connecting rod 220 and the third connecting rod 230 can be provided so that the first motor 210 can drive the first connecting rod 110 while being arranged in the middle position area aligned with the upper lip, making the overall structure more compact and the center of gravity more balanced.

[0042] In an optional embodiment, the upper lip movement mechanism is arranged on the maxillary model 300; the maxillary model 300 has an alveolar bone 310 protruding toward the outside of the upper lip; the under-actuated connecting piece 120 and the upper lip connector 130 have a side facing the inner side of the upper lip that can contact and lean against the convex surface of the alveolar bone 310.

[0043] In this embodiment, since the under-actuated connecting piece 120 and the upper lip connector 130 are both under-actuated and connected via the under-actuated rotating shaft, the alveolar bone 210 will protrude toward the outer side of the upper lip after the anthropomorphic arrangement. Figure 2 As shown, when the under-actuated connecting piece 120 and the upper lip connector 130 lean against the convex surface of the alveolar bone 310 with the side facing the inner side of the upper lip and move, the upper lip connector 130 will adaptively move as the shape of the alveolar bone 310 changes, thereby making the upper lip connected by the upper lip connector 130 move more naturally.

[0044] In an optional embodiment, the first end of the first connecting rod 110 is rotatably connected to the symmetrical center position on the maxillary model 300, and the center of the maxillary model 300 is aligned with the center position of the upper lip, so that the under-actuated connecting piece 120 and the upper lip connector 130 connected to the first connecting rod 110 can be directly connected to the center position of the upper lip with a simpler structural design, thereby driving the upper lip to perform pushing and stretching actions.

[0045] Example 2

[0046] The lip movement mechanism includes the upper lip movement mechanism, the lower lip movement mechanism 400 and the mandibular model 500 as described above. The installation position of the lower lip movement mechanism 400 is located at the bottom of the mandibular model 500; the upper lip movement mechanism should be understood as including any implementation of the above-mentioned upper lip movement mechanism, and has the beneficial effects of the corresponding implementation, which will not be repeated here.

[0047] In this embodiment, in addition to the above-mentioned upper lip movement mechanism, the lip movement mechanism also includes a mandibular model 500 and a lower lip movement mechanism 400. The upper lip movement mechanism and the lower lip movement mechanism 400 cooperate to achieve the effect of coordinated lip movement; wherein, the connection position of the lower lip movement mechanism 400 is located at the bottom of the mandibular model 500, which makes the structural design of the embodiment of the present application more compact and can also avoid the installation of other components.

[0048] In an optional embodiment, the lower lip movement mechanism 400 includes a second drive structure 410, a connecting rod assembly 420 and a lower lip connector 430; the second drive structure 410 is installed at the bottom of the mandibular model 500, and the output end of the second drive structure 410 is connected to the input end of the connecting rod assembly 420; the output end of the connecting rod assembly 420 is rotated to connect to the lower lip connector 430 to drive it to move tilted upward or tilted downward, and the lower lip connector 430 is connected to the lower lip.

[0049] In this embodiment, the second driving structure 410 drives the connecting rod assembly 420 to drive the lower lip connector 430 to move upward or downward. Specifically, for example, Figure 4 As shown, when tilted upward, it moves toward the outside of the lower lip; when tilted downward, it moves toward the inside of the lower lip; the lower lip connector 430 is connected to the flexible lower lip, so the rotation of the lower lip connector 430 connected to the connecting rod assembly 420 is an under-driven movement, so as to achieve a more natural movement effect when the lower lip moves up and down; optionally, the second drive structure 410 includes but is not limited to a second motor, a motor and other drive components.

[0050] In an optional embodiment, as Figure 4As shown, the connecting rod assembly 420 includes a fourth connecting rod 421, a fifth connecting rod 422 and a sixth connecting rod 423 which are rotatably connected to each other in sequence, and the sixth connecting rod 423 is rotatably connected to the lower lip connector 430; the mandibular model 500 has a tilted guide portion 510, and the sixth connecting rod 423 is suitable for guiding and moving along the guide portion 510; through the design of the connecting rod structure, when the second driving structure 410 is working, it can drive the sixth connecting rod 423 to move tilted upward or downward along the guide portion 510, and then drive the lower lip connected to the lower lip connector 430 to move up and down, and because the design between the lower lip connector 430 and the sixth connecting rod 423 is equivalent to an under-driven shaft, the up and down movement process of the lower lip is more natural and can also perform actions such as eversion.

[0051] Example 3

[0052] The mouth device includes a lip motion mechanism and a mouth corner motion mechanism that drives the movement of the mouth corners. The upper lip, lower lip, and mouth corners are connected to each other. The upper lip motion mechanism in the lip motion mechanism controls the upper lip to stretch upward or push downward; the lower lip motion mechanism controls the lower lip to move up and down. The underactuated structure design allows the upper and lower lips to evert independently during movement. Combined with the mouth corner motion mechanism, the three mechanisms can achieve a variety of mouth movements, increasing the richness of mouth movement.

[0053] It should be understood that the terms used herein are for the purpose of describing specific example embodiments only and are not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms "one", "an" and "said" as used herein may also be meant to include plural forms. The terms "comprise", "include", "contain" and "have" are inclusive and therefore specify the presence of stated features, steps, operations, elements and / or parts, but do not exclude the presence or addition of one or more other features, steps, operations, elements, parts, and / or combinations thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring them to be performed in the specific order described or illustrated, unless the order of execution is clearly indicated. It should also be understood that additional or alternative steps may be used.

[0054] Although the terms first, second, third, etc. can be used in the text to describe multiple elements, components, regions, layers and / or sections, these elements, components, regions, layers and / or sections should not be limited by these terms. These terms can only be used to distinguish an element, component, region, layer or section from another region, layer or section. Unless the context clearly indicates otherwise, terms such as "first", "second" and other numerical terms do not imply order or sequence when used in the text. Therefore, the first element, component, region, layer or section discussed below can be referred to as the second element, component, region, layer or section without departing from the teaching of the example embodiments.

[0055] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. Upper lip movement mechanism, characterized by: include a first drive structure (200); A connection assembly (100) comprising a first connecting rod (110) rotatably arranged along a first direction (A) and connected to an output end of the first driving structure (200); an underactuated connecting piece (120), wherein an input end of the underactuated connecting piece (120) is rotatably connected to an output end of the first connecting rod (110); An upper lip connector (130) is provided, wherein the input end of the upper lip connector (130) is rotatably connected to the output end of the under-driven connecting piece (120); and the output end of the upper lip connector (130) is connected to the upper lip.

2. The upper lip movement mechanism according to claim 1, characterized in that: The upper lip connector (130) comprises an upper lip connecting seat (131), a first connecting member (132) and a second connecting member (133); the upper lip connecting seat (131) is rotatably connected to the output end of the under-driven connecting piece (120); the first connecting member (132) is provided on the upper lip connecting seat (131), the first connecting member (132) is detachably connected to the second connecting member (133), and the second connecting member (133) is connected to the upper lip.

3. The upper lip movement mechanism according to claim 2, characterized in that: One of the first connecting member (132) and the second connecting member (133) is a boss structure, and the other is a groove structure, and the first connecting member (132) and the second connecting member (133) are connected by magnetic attraction.

4. The upper lip movement mechanism according to claim 3, characterized in that: The first driving structure (200) includes a first motor (210), a second connecting rod (220) and a third connecting rod (230), wherein the first motor (210) is arranged in a symmetrical central area opposite to the upper lip; the input end of the second connecting rod (220) is connected to the output end of the first motor (210), the input end of the third connecting rod (230) is connected to the output end of the second connecting rod (220), and the output end of the third connecting rod (230) is rotationally connected to the first connecting rod (110).

5. The upper lip movement mechanism according to claim 1, characterized in that: The upper lip movement mechanism is arranged on the maxillary model (300); the maxillary model (300) has an alveolar bone (310) protruding toward the outside of the upper lip; the under-actuated connecting piece (120) and the upper lip connector (130) are capable of contacting a convex surface arranged on the alveolar bone (310) on a surface facing the inside of the upper lip.

6. The upper lip movement mechanism according to claim 5, characterized in that: The first end of the first connecting rod (110) is rotatably connected to the symmetrical center position of the maxillary model (300), and the second end of the first connecting rod (110) is rotatably connected to the under-actuated connecting piece (120).

7. A lip movement mechanism, comprising an upper lip movement mechanism as described in any one of claims 1 to 6, a lower lip movement mechanism (400), and a mandibular model (500), wherein the connection position of the lower lip movement mechanism (400) is located at the bottom of the mandibular model (500).

8. The lip movement mechanism according to claim 7, characterized in that: The lower lip movement mechanism (400) includes a second driving structure (410), a connecting rod assembly (420) and a lower lip connector (430); the second driving structure (410) is installed at the bottom of the mandibular model (500), and the output end of the second driving structure (410) is connected to the input end of the connecting rod assembly (420); the output end of the connecting rod assembly (420) is rotated to connect to the lower lip connector (430) to drive it to move tilted upward or tilted downward, and the lower lip connector (430) is connected to the lower lip.

9. The lip movement mechanism according to claim 8, characterized in that: The connecting rod assembly (420) includes a fourth connecting rod (421), a fifth connecting rod (422) and a sixth connecting rod (423) which are rotatably connected to each other in sequence, and the sixth connecting rod (423) is rotatably connected to the lower lip connector (430); the mandibular model (500) has an inclined guide portion (510), and the sixth connecting rod (423) is suitable for guiding and moving along the guide portion (510).

10. A mouth device comprising a lip movement mechanism as described in any one of claims 7 to 9, a mouth corner movement mechanism for driving the mouth corners to move, an upper lip, a lower lip and a mouth corner; the upper lip, the lower lip and the mouth corners are connected to each other.

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