Pop-up network camera
By designing a pop-up structure including a positioning component, a balancing component and a damper in the network camera, the problems of laborious operation and high manufacturing cost in the existing technology are solved, the balance and smooth operation of the sliding parts are achieved, and the manufacturing cost is reduced.
Patent Information
- Application Number
- CN202311553163.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2023-07-19
- Filing Date
- 2023-11-21
- Publication Date
- 2025-01-21
AI Technical Summary
The pop-up module of existing network cameras is laborious to operate and has high manufacturing costs. The slider is prone to tilt when the force imbalances on both sides, resulting in increased sliding friction and poor operability.
A pop-up network camera including a fixed part, a sliding part, an image capture module, a balance component, a positioning component, a check structure and a damper is designed. The sliding member is locked by the second elastic member provided by the positioning component, and the user only needs to apply a small force to release the lock; the combination of the balancing component and the engaging member ensures that the sliding member is balanced and smooth; the damper reduces the sliding speed by frictionally contacting the engaging member.
A pop-up network camera with simple structure, labor-saving operation, balanced force application, smooth sliding, low manufacturing cost and good operability is realized, which solves the problems of laborious operation and high manufacturing cost in the existing technology.
Smart Images
Figure CN119333713A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to a pop-up device, and more particularly to a pop-up network camera with simple structure, labor-saving operation, balanced force application, smooth sliding, low manufacturing cost and good operability. Background Art
[0002] Most current network camera retractable mechanisms use door latches to retract and lock the pop-up module. Therefore, when the pop-up module is to be released, the user must apply a large force to the door latch to successfully eject the pop-up module, which is laborious and has a high manufacturing cost.
[0003] Furthermore, the existing telescopic mechanism of the network camera mostly includes a fixed part, a sliding part that can slide frictionally relative to the fixed part, and a tension spring, a compression spring or a constant force spring arranged on both sides of the sliding part. However, this design causes the sliding part to tilt when the force applied on both sides is unbalanced (for example, when only one side is subjected to force), resulting in a greater sliding friction between the sliding part and the fixed part, so the operability is poor.
[0004] Therefore, how to solve the above problems has become a topic of concern in the industry. Summary of the invention
[0005] The main purpose of the present invention is to provide a pop-up network camera with simple structure, labor-saving operation, balanced force application, smooth sliding, low manufacturing cost and good operability.
[0006] To achieve the above-mentioned purpose, the present invention provides a pop-up network camera, which includes a fixing member, a sliding member, an image capture module, a balancing component, a positioning component, a non-return structure and at least one damper. The fixing member is fixedly arranged on a display, the sliding member can slide relative to the fixing member, the image capture module is at least partially arranged on the sliding member, the balancing component is used to avoid unbalanced forces on both sides when the sliding member slides relative to the fixing member, the positioning component and the non-return structure are used to enable the sliding member to slide or be positioned between different positions relative to the fixing member, and the damper is used to reduce a sliding speed of the sliding member relative to the fixing member.
[0007] In the present invention, since the force for locking the sliding member is provided by the second elastic member of the positioning assembly, the user only needs to apply a small force to overcome the elastic force of the second elastic member to complete the unlocking of the sliding member. Furthermore, in the present invention, through the rotational engagement of the first engagement member and the third engagement member, the rotational engagement of the second engagement member and the fourth engagement member, and the rotational engagement of the first engagement member and the second engagement member, the sliding member is less likely to produce a situation of unbalanced force on both sides when sliding, so that the sliding member can slide smoothly relative to the fixed member. In addition, in the present invention, the damper reduces the rotation speed of the first engagement member and / or the second engagement member by frictional contact, and this design has the advantages of simple structure, low manufacturing cost and easy adjustment. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] Figure 1 The figure is a schematic diagram of the appearance of a display device according to an embodiment of the present invention.
[0009] Figure 2 An exploded view of components of a display device according to an embodiment of the present invention.
[0010] Figure 3 and Figure 4 Exploded views of components of a pop-up network camera at different viewing angles according to an embodiment of the present invention.
[0011] Figure 5 FIG. 4 is a schematic diagram of a partial internal structure of a pop-up network camera in a first state according to an embodiment of the present invention.
[0012] Figure 6 FIG. 4 is a schematic cross-sectional view of a portion of the structure of a pop-up network camera in a first state according to an embodiment of the present invention.
[0013] Figure 7 FIG. 4 is a schematic diagram of a partial internal structure of a pop-up network camera in a second state according to an embodiment of the present invention.
[0014] Figure 8 FIG. 4 is a partial structural cross-sectional diagram of a pop-up network camera in a second state according to an embodiment of the present invention.
[0015] Fig. 9 FIG. 4 is a schematic diagram of a portion of the internal structure of the pop-up network camera in the third state according to an embodiment of the present invention.
[0016] Fig.10 FIG. 4 is a partial structural cross-sectional diagram of a pop-up network camera in a third state according to an embodiment of the present invention.
[0017] Description of reference numerals: 1-display device; 11-display; 111-front frame; 1111-mounting column; 112-rear shell; 12-pop-up network camera; 121-fixing member; 1211-first positioning column; 1212-second positioning column; 122-sliding member; 1221-accommodating groove; 123-image capture module; 1231-lens; 124-positioning assembly; 1241-clamping member; 1241A-clamping portion; 1241B-pivoting portion; 1242-first elastic member; 1243-card matching structure; 1243A-channel; 1243A1-first channel portion; 1243A2-second channel portion; 1243A3-third channel portion; 1243A4-fourth channel portion; 124 3A5-fifth channel portion; 1244-second elastic member; 125-anti-return structure; 126-balancing assembly; 1261-first meshing member; 1261A-first meshing portion; 1261B-second meshing portion; 1262-second meshing member; 1262A-third meshing portion; 1262B-fourth meshing portion; 1263-third meshing member; 1264-fourth meshing member; 127-damper; 1271-rib; D-predetermined direction; D1-first direction; D2-second direction; E-extended position; G-groove; H-through structure; L1, L2-side wall; P1-starting position; P2-engaging position; R-retracted position; S-sliding direction; S1-first side; S2-second side; W-bottom wall. DETAILED DESCRIPTION
[0018] The directional terms mentioned in the following embodiments, such as up, down, left, right, front or back, etc., are only referenced to the directions of the attached drawings. Therefore, the directional terms used are used for explanation and not for limiting the present invention. In addition, unless otherwise specified, the term "connection" herein includes any direct and indirect electrical or structural connection means. Therefore, if the text describes that a first device is connected to a second device, it means that the first device can be directly structurally connected to the second device, or indirectly structurally connected to the second device through other devices or connection means.
[0019] See also Figure 1 , Figure 2 , Figure 1 Schematic diagram of the appearance of a display device 1 according to an embodiment of the present invention. Figure 2 1 is an exploded view of the components of the display device 1 according to an embodiment of the present invention. The display device 1 may be a screen including a display 11 and a pop-up network camera 12. The pop-up network camera 12 is installed between a front frame 111 and a rear shell 112 of the display 11. The pop-up network camera 12 can be switched between a retracted state and a pop-up state relative to the display 11.
[0020] See also Figure 3 and Figure 4 , Figure 3and Figure 4 1 is an exploded view of the components of the pop-up network camera 12 at different viewing angles according to an embodiment of the present invention. The pop-up network camera 12 includes a fixing member 121, a sliding member 122, an image capture module 123, a positioning assembly 124, a non-return structure 125, a balancing assembly 126, and two dampers 127. The fixing member 121 can be fixed to at least one mounting column 111 of the front frame 111 of the display 11 by screw locking, the sliding member 122 can slide relative to the fixing member 121, and the image capture module 123 is at least partially disposed on the sliding member 122. For example, the image capture module 123 can include a lens 1231 disposed on the sliding member 122 and moving with the sliding member 122. When the pop-up network camera 12 is switched from the retracted state to the pop-up state, the lens 1231 of the image capture module 123 can be exposed to capture images. The positioning assembly 124 is disposed between the fixed member 121 and the sliding member 122. The positioning assembly 124 can cooperate with the anti-return structure 125 to allow the sliding member 122 to slide or position between different positions relative to the fixed member 121. The balancing assembly 126 is disposed between the fixed member 121 and the sliding member 122 to ensure that the sliding of the sliding member 122 relative to the fixed member 121 is smooth and balanced. The damper 127 is used to reduce the sliding speed of the sliding member 122 relative to the fixed member 121.
[0021] See also Figures 3 to 10 , Figure 5 FIG. 1 is a schematic diagram of a partial internal structure of a pop-up network camera 12 in a first state according to an embodiment of the present invention. Figure 6 FIG. 1 is a partial structural cross-sectional diagram of a pop-up network camera 12 in a first state according to an embodiment of the present invention. Figure 7 FIG. 1 is a schematic diagram of a partial internal structure of the pop-up network camera 12 in the second state according to an embodiment of the present invention. Figure 8 FIG. 1 is a schematic cross-sectional view of a portion of the structure of the pop-up network camera 12 in the second state according to an embodiment of the present invention. Fig. 9 FIG. 1 is a schematic diagram of a portion of the internal structure of the pop-up network camera 12 in the third state according to an embodiment of the present invention. Fig.101 is a partial structural cross-sectional diagram of the pop-up webcam 12 in the third state according to an embodiment of the present invention. In order to enable the sliding member 122 to slide or position between different positions relative to the fixing member 121, the positioning assembly 124 includes a locking member 1241, a first elastic member 1242, a matching structure 1243 and a second elastic member 1244. The locking member 1241 is rotatably disposed on the sliding member 122, the matching structure 1243 is disposed on the fixing member 121 and forms a channel 1243A, the locking member 1241 includes a locking portion 1241A that moves along the channel 1243A, the first elastic member 1242 abuts between the locking member 1241 and the sliding member 122, the second elastic member 1244 connects the fixing member 121 and the sliding member 122 and is centrally disposed relative to the fixing member 121 and the sliding member 122, and the positioning assembly 124 is used to allow the sliding member 122 to be relative to the fixing member 121 by the following steps: Fig. 9 and Fig.10 The extended position E shown is similar to the Figure 5 and Figure 6 Slide or position between a retracted position R as shown. Fig. 9 and Fig.10 As shown, when the sliding member 122 is at the extended position E relative to the fixing member 121, the engaging portion 1241A is at a starting position P1 relative to the channel 1243A. Figure 5 and Figure 6 As shown, when the sliding member 122 is located at the retracted position R relative to the fixing member 121, the engaging portion 1241A is located at an engaging position P2 relative to the channel 1243A. Figure 6 , Figure 8 and Fig.10 As shown, the anti-return structure 125 is used to guide the engaging portion 1241A to return to the starting position P1 along a predetermined direction D from the starting position P1 to the engaging position P2 when the sliding member 122 returns to the extended position E from the extended position E to the retracted position R.
[0022] Furthermore, in this embodiment, the first elastic member 1242 can be a torsion spring, the second elastic member 1244 can be a constant force spring, the engaging member 1241 further includes a pivoting portion 1241B, which is pivotally connected to the sliding member 122, and a receiving groove 1221 is formed on a first side S1 of the sliding member 122. The engaging member 1241 is at least partially rotatably disposed in the receiving groove 1221. The two side walls L1 and L2 of the receiving groove 1221 are used to abut the engaging member 1241 to limit the rotation angle of the engaging member 1241. The first elastic member 1242 is sleeved on the engaging member 124 1 and is located in the accommodating groove 1221, two ends of the first elastic member 1242 respectively abut against one of the two side walls L1 and L2 of the accommodating groove 1221 and the engaging member 1241, the fixing member 121 is adjacent to a second side S2 of the sliding member 122 relative to the first side S1, a bottom wall W of the accommodating groove 1221 is formed with a through structure H, the engaging member 1241 is penetrated by the through structure H and extends from the first side S1 to the second side S2 of the sliding member 122, so that the engaging portion 1241A can be matched with the matching structure 1243 located on the fixing member 121.
[0023] In addition, if Figure 6 , Figure 8 and Fig.10As shown, the channel 1243A includes a first channel portion 1243A1, a second channel portion 1243A2, a third channel portion 1243A3, a fourth channel portion 1243A4 and a fifth channel portion 1243A5, the end of the first channel portion 1243A1 close to the engaging position P2 and the end of the second channel portion 1243A2 close to the engaging position P2 are connected to each other, the first channel portion 1243A1 and the second channel portion 1243A2 are arranged in a V or U shape, the end of the third channel portion 1243A3 away from the starting position P1 is connected to the end of the first channel portion 1243A1 away from the engaging position P2, the end of the fourth channel portion 1243A4 away from the starting position P1 is connected to the end of the second channel portion 1243A2 away from the engaging position P2, and the end of the third channel portion 1243A3 close to the starting position P1 is connected to the end of the fourth channel portion 1243A5 A4 is connected with the end thereof near the starting position P1, the third channel portion 1243A3 and the fourth channel portion 1243A4 are arranged in a V or U shape or are respectively formed in two L-shaped structures, the fifth channel portion 1243A5 is formed between the connecting point of the end of the third channel portion 1243A3 near the starting position P1 and the end of the fourth channel portion 1243A4 near the starting position P1 and the starting position P1, the end of the fifth channel portion 1243A5 away from the starting position P1 is connected with the end of the third channel portion 1243A3 near the starting position P1 and the end of the fourth channel portion 1243A4 near the starting position P1, the non-return structure 125 is close to the connecting point of the end of the third channel portion 1243A3 near the starting position P1 and the end of the fourth channel portion 1243A4 near the starting position P1, and the non-return structure 125 elastically abuts against the wall of the fourth channel portion 1243A4.
[0024] When the pop-up web camera 12 is to be retracted and positioned, the user only needs to apply force to the sliding member 122 to move the sliding member 122 away from the first direction D1. Fig. 9 and Fig.10 As shown in the extended position E, and when the sliding member exceeds the first direction D1 as shown in the Figure 5 and Figure 6 In the above process, the engaging portion 1241A can be moved along the fifth channel portion 1243A5, the third channel portion 1243A3, the first channel portion 1243A1 of the channel 1243A under the action of the anti-return structure 125, the first elastic member 1242 and the second elastic member 1244. Fig. 9 and Fig.10 The starting position P1 shown is moved to Figure 5 and Figure 6When the engaging portion 1241A is at the engaging position P2, the engaging portion 1241A engages with the matching structure 1243, so at this time the sliding member 122 is positioned at the retracted position R relative to the fixing member 121. It is worth noting that when the sliding member 122 moves along the first direction D1 to make the engaging portion 1241A contact the anti-return structure 125, the anti-return structure 125 abuts against the wall surface of the fourth channel portion 1243A4, thereby allowing the engaging portion 1241A to enter the third channel portion 1243A3 (i.e., preventing the engaging portion 1241A from entering the fourth channel portion 1243A4).
[0025] When the pop-up web camera 12 is to be ejected from the retracted position R, the user only needs to apply force to the sliding member 122 to move the sliding member 122 away from the first direction D1. Figure 5 and Figure 6 The engaging portion 1241A can move along the second channel portion 1243A2, the fourth channel portion 1243A4, and the fifth channel portion 1243A5 of the channel 1243A under the action of the anti-return structure 125, the first elastic member 1242, and the second elastic member 1244. Figure 5 and Figure 6 The engagement position P2 shown is as shown in FIG. Figure 7 and Figure 8 Move the position shown to Fig. 9 and Fig.10 When the engaging portion 1241A is located at the starting position P1, the engaging portion 1241A engages with the matching structure 1243, so at this time the sliding member 122 is positioned at the extended position E relative to the fixing member 121. It is worth noting that when the sliding member 122 moves along a second direction D2 to make the engaging portion 1241A contact the anti-return structure 125, the anti-return structure 125 is elastically deformed to leave the wall surface of the fourth channel portion 1243A4, thereby allowing the engaging portion 1241A to enter the fifth channel portion 1243A4.
[0026] In addition, if Figures 3 to 5 , Figure 7 and Fig. 9As shown, in order to make the sliding member 122 slide smoothly relative to the fixed member 121, the balancing assembly 126 includes a first gearing member 1261, a second gearing member 1262, a third gearing member 1263 and a fourth gearing member 1264. The first gearing member 1261 and the second gearing member 1262 are rotatably disposed on the fixed member 121, and the third gearing member 1263 and the fourth gearing member 1264 are fixedly disposed on the sliding member 122. The first gearing member 1261 includes a first gearing portion 1261A and a second gearing portion 1261B. The first gearing portion 1261A and the second gearing portion 1261B are coaxially disposed. The second gearing member 1262 includes a third gearing portion 1262A and a A fourth meshing portion 1262B, the third meshing portion 1262A and the fourth meshing portion 1262B are coaxially arranged, the first meshing portion 1261A and the third meshing portion 1262A are rotatably engaged with each other, the third meshing member 1263 and the fourth meshing member 1264 are located between the second meshing portion 1261B and the fourth meshing portion 1262B, the third meshing member 1263 and the fourth meshing member 1264 can be respectively located on both sides of the second elastic member 1244 (that is, the second elastic member 1244 is arranged between the third meshing member 1263 and the fourth meshing member 1264), the second meshing portion 1261B is rotatably engaged with the third meshing member 1263, and the fourth meshing portion 1262B is rotatably engaged with the fourth meshing member 1264.
[0027] Furthermore, in this embodiment, the first gearing member 1261 and the second gearing member 1262 can be gears respectively, the third gearing member 1263 and the fourth gearing member 1264 can be racks respectively, a first positioning column 1211 and a second positioning column 1212 are formed on the fixed member 121, the first gearing member 1261 and the second gearing member 1262 are rotatably disposed on the first positioning column 1211 and the second positioning column 1212 respectively, and the first gearing member 1261 and the second gearing member 1262 are arranged along an arrangement direction perpendicular to a sliding direction S of the sliding member 122 relative to the fixed member 121.
[0028] In addition, if Figure 3 and Figure 4 As shown, the two dampers 127 are respectively disposed between the fixing member 121 and the first gearing member 1261 and between the fixing member 121 and the second gearing member 1262, and the two dampers 127 reduce the rotation speed of the first gearing member 1261 and the second gearing member 1262 by frictionally contacting the first gearing member 1261 and the second gearing member 1262.
[0029] Each damper 127 includes a rib 1271 protruding from the fixing member 121, and a groove G is formed on the first engaging member 1261 and the second engaging member 1262, respectively. When the first engaging member 1261 and the second engaging member 1262 rotate, the rib 1271 slides in the groove G. It is worth noting that the number of ribs 1271 and grooves G can be determined according to actual needs. The more the number of ribs 1271 and grooves G, the greater the friction force generated, and the greater the deceleration effect achieved. In addition, it can be understood that in another embodiment, the pop-up network camera may only include a damper corresponding to the first engaging member, which may include a rib formed on the first engaging member, and the fixing member may be formed with a groove matching the rib, and damping oil may be applied between the rib and the groove.
[0030] In the present invention, since the force for locking the sliding member is provided by the second elastic member of the positioning assembly, the user only needs to apply a small force to overcome the elastic force of the second elastic member to complete the unlocking of the sliding member. Furthermore, in the present invention, through the rotational engagement of the first engagement member and the third engagement member, the rotational engagement of the second engagement member and the fourth engagement member, and the rotational engagement of the first engagement member and the second engagement member, the sliding member is less likely to produce a situation of unbalanced force on both sides when sliding, so that the sliding member can slide smoothly relative to the fixed member. In addition, in the present invention, the damper reduces the rotation speed of the first engagement member and / or the second engagement member by friction contact, and this design has the advantages of simple structure, low manufacturing cost and easy adjustment.
[0031] The above description is only a preferred embodiment of the present invention. All equivalent changes and modifications made according to the claims of the present invention should fall within the scope of the present invention.
Claims
1. A pop-up network camera, characterized in that: Contains: A fixing member fixedly disposed on a display; a sliding member capable of sliding relative to the fixed member; an image capture module, at least partly disposed on the sliding member; A balancing component, comprising a first gearing, a second gearing, a third gearing and a fourth gearing, wherein the first gearing and the second gearing are rotatably disposed on the fixed member, and the third gearing and the fourth gearing are fixedly disposed on the sliding member, the first gearing comprises a first gearing portion and a second gearing portion, the first gearing portion and the second gearing portion are coaxially disposed, the second gearing comprises a third gearing portion and a fourth gearing portion, the third gearing portion and the fourth gearing portion are coaxially disposed, the first gearing portion and the third gearing portion are rotatably engaged with each other, the third gearing and the fourth gearing are adjacently disposed and located between the second gearing portion and the fourth gearing portion, the second gearing portion is rotatably engaged with the third gearing, and the fourth gearing portion is rotatably engaged with the fourth gearing; A positioning assembly, comprising a clamping member, a first elastic member, a second elastic member and a matching card structure, wherein the clamping member is rotatably disposed on the sliding member, the matching card structure is disposed on the fixed member and forms a channel, the clamping member comprises a clamping portion moving along the channel, the first elastic member abuts against the clamping member, the second elastic member connects the fixed member and the sliding member and is located between the third gearing member and the fourth gearing member, the positioning assembly is used to allow the sliding member to slide or position between an extended position and a retracted position relative to the fixed member, when the sliding member is located at the retracted position relative to the fixed member, the clamping portion is located at a clamping position relative to the channel, and when the sliding member is located at the extended position relative to the fixed member, the clamping portion is located at a starting position relative to the channel; a non-return structure for guiding the engaging portion to move along a predetermined direction from the starting position through the engaging position and back to the starting position when the sliding member moves from the extended position through the retracted position and back to the extended position; and At least one damper is disposed between the fixing member and at least one of the first engaging member and the second engaging member and is configured to reduce a rotation speed of at least one of the first engaging member and the second engaging member by frictionally contacting the at least one of the first engaging member and the second engaging member.
2. The pop-up network camera according to claim 1, wherein: The first engaging member and the second engaging member are arranged along an arrangement direction perpendicular to a sliding direction of the sliding member relative to the fixing member.
3. The pop-up network camera according to claim 1, wherein: The at least one damper includes at least one rib protruding from the fixing member, and at least one of the first engaging member and the second engaging member is formed with at least one groove. When the at least one of the first engaging member and the second engaging member rotates, the at least one rib frictionally slides in the at least one groove.
4. The pop-up network camera according to claim 1, wherein: The first meshing member and the second meshing member are respectively a gear, and the third meshing member and the fourth meshing member are respectively a rack.
5. The pop-up network camera according to claim 1, wherein: The first elastic member is a torsion spring abutting against the engaging member and the sliding member, and the second elastic member is a constant force spring centrally disposed relative to the fixing member and the sliding member.
6. The pop-up network camera according to claim 1, wherein: A first positioning post and a second positioning post are formed on the fixing member. The first engaging member and the second engaging member are rotatably disposed on the first positioning post and the second positioning post respectively.
7. The pop-up network camera according to claim 1, wherein: The engaging member further comprises a pivoting portion which is pivotally connected to the sliding member.
8. The pop-up network camera according to claim 1, wherein: A receiving groove is formed on a first side of the sliding member, and the engaging member is at least partially rotatably disposed in the receiving groove. Two side walls of the receiving groove are used to abut the engaging member to limit a rotation angle of the engaging member. The first elastic member is sleeved on the engaging member and is located in the receiving groove. Two ends of the first elastic member respectively abut one of the two side walls of the receiving groove and the engaging member. The fixing member is adjacent to a second side of the sliding member relative to the first side. A through structure is formed on a bottom wall of the receiving groove. The engaging member is penetrated through the through structure and extends from the first side of the sliding member to the second side.
9. The pop-up network camera according to any one of claims 1 to 8, characterized in that: The channel includes a first channel portion, a second channel portion, a third channel portion, a fourth channel portion and a fifth channel portion, an end portion of the first channel portion near the engaging position is connected to an end portion of the second channel portion near the engaging position, the first channel portion and the second channel portion are arranged in a V or U shape, an end portion of the third channel portion away from the starting position is connected to an end portion of the first channel portion away from the engaging position, an end portion of the fourth channel portion away from the starting position is connected to an end portion of the second channel portion away from the engaging position, an end portion of the third channel portion near the starting position is connected to an end portion of the fourth channel portion near the starting position, the third channel portion and the fourth channel portion are arranged in a V or U shape or are respectively two L-shaped structures, the fifth channel portion is formed between a connecting point between the end portion of the third channel portion near the starting position and the end portion of the fourth channel portion near the starting position and the starting position, and an end portion of the fifth channel portion away from the starting position is connected to the end portion of the third channel portion near the starting position and the end portion of the fourth channel portion near the starting position.
10. The pop-up network camera according to claim 9, wherein: The non-return structure is close to the connection between the end of the third channel portion close to the starting position and the end of the fourth channel portion close to the starting position and elastically abuts against a wall surface of the fourth channel portion.