A pupillary distance diopter rotation adjustment mechanism

Abstract

This invention relates to a diopter and interpupillary distance (IPD) adjustment mechanism. The mechanism includes a main frame with left and right eyepieces mounted on it, and left and right displays corresponding to the eyepieces. A diopter adjustment component is located on the side of each eyepiece for adjusting the distance between the display and the eyepiece on one side, and an IPD adjustment component is located on the side for adjusting the left or right movement of the eyepiece on one side. The diopter adjustment component is driven to the display; the IPD adjustment component is driven to the eyepiece; both the diopter adjustment component and the IPD adjustment component are rotatable. This adjustment mechanism can precisely control the diopter and IPD of a single eye, allowing both eyes to be adjusted to their optimal state. It is convenient to operate, allowing diopter and IPD adjustments to be completed from the same position, greatly improving the user experience of smart glasses.

Description

Technical Field

[0001] This invention relates to the field of smart hardware technology, and more specifically, to a pupillary distance diopter rotation adjustment mechanism. Background Technology

[0002] Smart glasses (also known as mobile media players or head-mounted displays) are wearable devices that use optical technology to guide the video image light emitted by a miniature image display (such as a transmissive or reflective liquid crystal display, an organic light-emitting device, or a DMD device) to the user's pupils, enabling virtual and magnified images within the user's near field of vision, and providing the user with intuitive and visual images, videos, and text information.

[0003] To achieve better display results, users need to press their eyes and the surrounding face tightly against the smart glasses when wearing them. This makes it difficult for some users with poor vision to use both smart glasses and regular glasses simultaneously, resulting in a blurry image and significantly impacting the user experience. Therefore, current smart glasses on the market offer diopter and interpupillary distance adjustment functions, allowing users to adjust these settings while wearing the smart glasses, enabling them to see a clear image without needing to wear regular glasses.

[0004] The existing smart glasses mainly use the following adjustment methods for diopter and interpupillary distance: (1) using built-in cams and threads, and external manual rollers for adjustment; (2) adjusting by sliding through external toggle keys; (3) achieving simultaneous adjustment of both eyes through a gear system, and adjusting with external manual rollers. However, these adjustment methods have disadvantages such as inconvenient operation, poor driving accuracy of sliding adjustment, and inability to independently correct differences between the left and right eyes, which greatly affect the user experience of smart glasses. Summary of the Invention

[0005] The technical problem to be solved by the present invention is that the existing smart glasses have the disadvantages of inconvenient operation, poor sliding adjustment driving accuracy, and inability to independently correct the difference between the left and right eyes. In view of the above-mentioned defects of the prior art, an interpupillary distance and diopter rotation adjustment mechanism is provided.

[0006] The technical solution adopted by this invention to solve its technical problem is as follows: A diopter adjustment mechanism for interpupillary distance is constructed, comprising a main frame, on which left and right eyepieces are provided, and left and right display screens are provided corresponding to the left and right eyepieces; a diopter adjustment component for adjusting the distance between the display screen and the eyepiece on one side is provided on the side of the eyepiece, and an interpupillary distance adjustment component for adjusting the left or right movement of the eyepiece on one side; the diopter adjustment component is driven to the display screen; the interpupillary distance adjustment component is driven to the eyepiece; both the diopter adjustment component and the interpupillary distance adjustment component are rotatable structures.

[0007] Furthermore, the interpupillary distance adjustment assembly includes a first screw, a first knob, and a first transmission component; the first knob and the first screw are drivenly connected via the first transmission component; the first screw is drivenly connected to the eyepiece.

[0008] Furthermore, the first transmission component includes a first bracket, a first connector disposed on the first bracket, and a first drive gear; the first drive gear is located on the side of the first connector facing the eyepiece, and the first knob is located on the side of the first connector facing away from the eyepiece; both the first drive gear and the first knob are connected to the first connector.

[0009] Furthermore, the first bracket is provided with a first driven gear that meshes with the first drive gear; the first screw is provided with a second driven gear that meshes with the first driven gear.

[0010] Furthermore, the eyepiece is provided with a first threaded block; the main frame is provided with a limiting hole; the first screw passes through the limiting hole and the first threaded block, and is drivenly connected to the first threaded block.

[0011] Furthermore, the first connector is provided with a plurality of slots; the first bracket is provided with a first spring and a first steel ball; the first spring pushes the first steel ball into the slots.

[0012] Furthermore, the diopter adjustment assembly includes a movable frame; the movable frame is disposed on the eyepiece, and the display screen is disposed in the movable frame.

[0013] Furthermore, the diopter adjustment assembly includes a second screw, a second knob, and a second transmission component; the second screw and the second knob are drivenly connected via the second transmission component; the second screw is drivenly connected to the movable frame.

[0014] Furthermore, the second transmission component includes: a second bracket disposed on the first bracket, and a second connector passing through the second bracket, the first drive gear and the first connector; the second knob is connected to the second connector.

[0015] Furthermore, the second transmission component further includes: a second drive gear disposed on the second connector, and a third driven gear disposed on the second screw; the second drive gear meshes with the third driven gear.

[0016] Furthermore, a first connecting block is provided on the side of the mobile frame; a second threaded block is slidably connected in the first connecting block; the second screw passes through the second threaded block and is drivenly connected to the second threaded block.

[0017] Furthermore, the second connector is provided with a rotating gear; the second bracket is provided with a second spring and a second steel ball; the second spring pushes the second steel ball into the teeth of the rotating gear.

[0018] Furthermore, the movable frame is provided with a first guide shaft; the eyepiece is provided with a first through hole; and the first guide shaft is disposed in the first through hole.

[0019] Furthermore, the eyepiece is provided with a second connecting block and a second guide shaft passing through the second connecting block; the main frame is provided with a second through hole, and the two ends of the second guide shaft are respectively disposed in the second through hole.

[0020] The beneficial effects of this invention are as follows: by setting interpupillary distance adjustment components and diopter adjustment components on the left and right eyepieces and the display screen respectively, the diopter and interpupillary distance of a single eye can be precisely controlled, allowing both eyes to be adjusted to the optimal usage state. Both the interpupillary distance adjustment component and the diopter adjustment component are located on the side of the eyepiece, i.e., in the same position, and both are rotatable structures, allowing for independent rotation and adjustment. This convenient operation, enabling diopter and interpupillary distance adjustment to be completed from the same position, greatly improves the user experience of smart glasses. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0022] Figure 1 This is an exploded view of an interpupillary distance diopter rotation adjustment mechanism according to an embodiment of the present invention;

[0023] Figure 2 Embodiments of the present invention Figure 1 Enlarged view of point A in the middle;

[0024] Figure 3 Embodiments of the present invention Figure 1 Enlarged view of point B in the middle;

[0025] Figure 4 This is a schematic diagram of the structure of a pupillary distance diopter rotation adjustment mechanism according to an embodiment of the present invention;

[0026] Figure 5 This is a top view schematic diagram of the refractive power adjustment component and the interpupillary distance adjustment component of the right eye in an embodiment of the present invention;

[0027] Figure 6 Embodiments of the present invention Figure 5 Schematic diagram of cross-section at CC;

[0028] Figure 7 This is a front view schematic diagram of the pupillary distance refractive power rotation adjustment mechanism for the left eye according to an embodiment of the present invention;

[0029] Figure 8 This is a frontal view of the refractive power adjustment component and the interpupillary distance adjustment component of the left eye in an embodiment of the present invention;

[0030] Figure 9 Embodiments of the present invention Figure 9 Schematic diagram of the cross section at point DD;

[0031] Figure 10 This is a schematic diagram of the structure of the first connector according to an embodiment of the present invention.

[0032] In the diagram, 1. Main frame; 2. Eyepiece; 11. Limiting hole; 12. Second through hole; 21. First through hole; 22. Second connecting block; 23. Second guide shaft; 31. Moving frame; 32. Second screw; 33. Second knob; 34. Second bracket; 35. Second connector; 36. Second drive gear; 37. Third driven gear; 38. Second threaded block; 41. First screw; 42. First knob; 43. First bracket; 44. First connector; 45. First drive gear; 46. First driven gear; 47. Second driven gear; 48. First threaded block; 311. First connecting block; 312. First guide shaft; 341. Second spring; 342. Second steel ball; 351. Rotating gear; 431. First spring; 432. First steel ball; 441. Slot. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0034] Examples of embodiments of the present invention Figures 1 to 10As shown, a diopter adjustment mechanism for interpupillary distance is provided, including a main frame 1, on which left and right eyepieces 2 are provided, and left and right display screens (not shown in the figure) are provided corresponding to the left and right eyepieces 2; a diopter adjustment component for adjusting the distance between the display screen and the eyepiece 2 on one side is provided on the side of the eyepiece 2, and an interpupillary distance adjustment component for adjusting the left or right movement of the eyepiece 2 on one side; the diopter adjustment component is driven to the display screen; the interpupillary distance adjustment component is driven to the eyepiece 2; both the diopter adjustment component and the interpupillary distance adjustment component are rotatable structures.

[0035] The diopter adjustment component is connected to the single-sided display screen and is used to adjust the distance between the single-sided display screen and eyepiece 2. The interpupillary distance adjustment component is also connected to the single-sided eyepiece 2 and is used to move the single-sided eyepiece 2 to the left or right. Both the diopter adjustment component and the interpupillary distance adjustment component are located on the side of eyepiece 2 and are integrated into one unit, but both are rotatable structures, meaning they can rotate independently without interfering with each other.

[0036] This solution, by setting interpupillary distance adjustment components and diopter adjustment components on the left and right eyepieces 2 and the display screen respectively, allows for precise control of the diopter and interpupillary distance of a single eye, enabling both eyes to be adjusted to their optimal usage state. Both the interpupillary distance adjustment component and the diopter adjustment component are located on the side of the eyepiece 2, i.e., in the same position, and both are rotatable structures, allowing for independent rotation and adjustment. This convenient operation, enabling diopter and interpupillary distance adjustment to be completed from the same location, greatly improves the user experience of smart glasses.

[0037] In a further embodiment, the interpupillary distance adjustment assembly includes a first screw 41, a first knob 42, and a first transmission component; the first knob 42 and the first screw 41 are drivenly connected through the first transmission component; the first screw 41 is drivenly connected to the eyepiece 2.

[0038] By rotating the first knob 42, power is input. After being transmitted through the first transmission component, the power reaches the first screw 41, causing the first screw 41 to rotate with the rotation of the first knob 42, thereby driving the eyepiece 2 on one side to move left or right. By adjusting the left or right eyepiece 2 to move left or right respectively, the interpupillary distance of one eye can be precisely controlled, so that the position of the left and right eyepieces 2 can match the patient's eyes, and both eyes can be adjusted to the optimal usage state.

[0039] In a further embodiment, the first transmission component includes a first bracket 43, a first connector 44 disposed on the first bracket 43, and a first drive gear 45; the first drive gear 45 is located on the side of the first connector 44 facing the eyepiece 2, and the first knob 42 is located on the side of the first connector 44 facing away from the eyepiece 2; both the first drive gear 45 and the first knob 42 are connected to the first connector 44.

[0040] The first bracket 43 is provided with a first mounting part, and the first mounting part is provided with a first circular hole for accommodating the first connector 44. The first connector 44 is disposed in the first circular hole and is fixedly connected to the first drive gear 45 and the first knob 42 respectively by screws, so that when the knob is rotated, the first drive gear 45 rotates along with the first knob 42.

[0041] In a further embodiment, the first bracket 43 is provided with a first driven gear 46 that meshes with the first drive gear 45; the first screw 41 is provided with a second driven gear 47 that meshes with the first driven gear 46.

[0042] The first mounting section has a mounting position, where the first driven gear 46 is mounted. It can rotate but cannot move. The second driven gear 47 is fixed to the first screw 41 by screws. When the second driven gear 47 rotates, the first screw 41 rotates together with the second driven gear 47. Rotating the first knob 42 rotates the first drive gear 45, which drives the first driven gear 46 to rotate, thereby driving the second driven gear 47 and the first screw 41 to rotate. The first screw 41 drives the eyepiece 2 on one side to move left or right, which can precisely control the interpupillary distance of one eye, so that the position of the left and right eyepieces 2 can match the patient's eyes, and both eyes can be adjusted to the optimal use state.

[0043] Among them, the first driving gear 45, the first driven gear 46 and the second driven gear 47 are all spur gears.

[0044] In a further embodiment, the eyepiece 2 is provided with a first threaded block 48; the main frame 1 is provided with a limiting hole 11; the first screw 41 passes through the limiting hole 11 and the first threaded block 48, and is drivenly connected to the first threaded block 48.

[0045] The first screw 41 is threadedly connected to the first threaded block 48. The limiting hole 11 is used to limit the position of the first screw 41 when it rotates, preventing it from moving the eyepiece 2 back and forth. One end of the first screw 41 is restricted by the main frame 1, and the other end is restricted by the cooperation of the second driven gear 47 and the first driven gear 46 and the mounting position, so it can only rotate and cannot move left and right. During adjustment, turning the first knob 42 rotates the first drive gear 45, which drives the first driven gear 46 to rotate, thereby driving the second driven gear 47 and the first screw 41 to rotate. The first screw 41 drives the first threaded block 48 to move left or right, thereby driving the eyepiece 2 on one side to move left or right. This allows for precise control of the interpupillary distance of one eye, so that the position of the left and right eyepieces 2 can match the patient's eyes, and both eyes can be adjusted to the optimal usage state.

[0046] In a further embodiment, the diopter adjustment assembly includes a movable frame 31; the movable frame 31 is disposed on the eyepiece 2, and the display screen is disposed in the movable frame 31.

[0047] The display screen is fixedly mounted in the movable frame 31, which is mounted on the eyepiece 2 and can reciprocate relative to the eyepiece 2, thereby adjusting the distance between the eyepiece 2 on one side and the display screen to achieve diopter adjustment.

[0048] In a further embodiment, the diopter adjustment assembly includes a second screw 32, a second knob 33, and a second transmission member; the second screw 32 and the second knob 33 are drivenly connected through the second transmission member; the second screw 32 is drivenly connected to the movable frame 31.

[0049] Rotating the second knob 33 inputs power, which is transmitted through the second transmission component to the second screw 32. This causes the second screw 32 to rotate with the second knob 33, thereby moving the single-sided movable frame 31 forward or backward relative to the eyepiece 2. This adjusts the distance between the single-sided eyepiece 2 and the display screen, achieving refractive power adjustment. It allows precise control of the refractive power of a single eye, ensuring that the refractive power of both eyes matches the patient's eye condition, allowing both eyes to be adjusted to their optimal usage state.

[0050] In a further embodiment, the second transmission component includes: a second bracket 34 disposed on the first bracket 43, and a second connector 35 passing through the second bracket 34, the first drive gear 45 and the first connector 44; the second knob 33 is connected to the second connector 35.

[0051] The second bracket 34 is fixed to the bottom of the first bracket 43 by screws. The second bracket 34 has a second mounting part with a second circular hole corresponding to the position of the first circular hole, through which the second connecting member 35 passes. One end of the second knob 33 has a convex shaft that passes through the middle of the first knob 42. One end of the second connecting member 35 passes through both the first drive gear 45 and the first connecting member 44, and is connected to the second knob 33 by screws, so that when the second knob 33 rotates, it drives the second connecting member 35 to rotate as well. There is a certain gap between the second connecting member 35 and the second knob 33 in their combination with the first knob 42, the first connecting member 44, and the first drive gear 45. This ensures that even if the first knob 42 and the second knob 33 are in the same position, the rotation of the first knob 42, the first connecting member 44, and the first drive gear 45 does not interfere with the rotation of the second knob 33 and the second connecting member 35. Both sets of components can rotate independently, allowing for unilateral adjustment of refractive power and interpupillary distance. By placing the first knob 42 and the second knob 33 adjacent to each other, one can easily adjust the interpupillary distance or diopter on one side by gently rotating the first knob 42 or the second knob 33 in the same position. This makes operation convenient and improves the user experience of smart glasses.

[0052] In a further embodiment, the second transmission member further includes: a second drive gear 36 disposed on the second connector 35, and a third driven gear 37 disposed on the second screw 32; the second drive gear 36 and the third driven gear 37 are meshed together.

[0053] One end of the second connecting member 35 is provided with a rotating gear 351, and the second driving gear 36 is fixedly connected to the rotating gear 351 by screws. The third driven gear 37 is fixedly connected to the second screw 32 by screws, so that the second screw 32 rotates together with the third driven gear 37. Both the second driving gear 36 and the third driven gear 37 are bevel gears. By setting the rotating gear 351, when the second connecting member 35 rotates, its left side is limited by the second driving gear 36 and the third driven gear 37, and its right side is limited by the rotating gear 351 and the second protrusion, preventing the second knob 33 from disengaging during rotation.

[0054] In a further embodiment, the movable frame 31 is provided with a first connecting block 311 on its side; the first connecting block 311 is provided with a second threaded block 38; the second screw 32 passes through the second threaded block 38 and is driven to connect with the second threaded block 38.

[0055] The first connecting block 311 is fixed to the side wall of the movable frame 31 by screws, and the second threaded block 38 is slidably connected in the first connecting block 311. The second screw 32 is drivenly connected to the second threaded block 38. The second bracket 34 has a recess, and the second screw 32 is mounted in the recess and limited, so it can only rotate but cannot move back and forth. Rotating the second knob 33 causes the second connecting piece 35 to rotate, which in turn drives the second drive gear 36 to rotate, thereby driving the third driven gear 37 to rotate together with the second screw 32. The second screw 32 drives the second threaded block 38 to move forward or backward, so that the movable frame 31 moves forward or backward with the second threaded block 38, thereby adjusting the distance between the eyepiece 2 on one side and the display screen, and realizing the diopter adjustment on one side.

[0056] In a further embodiment, the movable frame 31 is provided with a first guide shaft 312; the eyepiece 2 is provided with a first through hole 21; and the first guide shaft 312 is disposed in the first through hole 21.

[0057] The cooperation between the first guide shaft 312 and the first through hole 21 ensures that the moving frame 31 moves forward or backward in a straight line when it is driven, thus preventing the position between the display screen and the eyepiece 2 from deviating.

[0058] In a further embodiment, the eyepiece 2 is provided with a second connecting block 22 and a second guide shaft 23 passing through the second connecting block 22; the main frame 1 is provided with a second through hole 12, and the two ends of the second guide shaft 23 are respectively disposed in the second through hole 12.

[0059] By cooperating with the second guide shaft 23 and the second through hole 12, and cooperating with the first screw 41 and the limiting hole 11, the eyepiece 2 on one side is limited to prevent the eyepiece 2 from moving back and forth when adjusting the interpupillary distance.

[0060] In a further embodiment, the first connector 44 is provided with a plurality of slots 441; the first bracket 43 is provided with a first spring 431 and a first steel ball 432; the first spring 431 pushes the first steel ball 432 into the slots 441. The second connector 35 is provided with a rotating gear 351; the second bracket 34 is provided with a second spring 341 and a second steel ball 342; the second spring 341 pushes the second steel ball 342 into the teeth of the rotating gear 351.

[0061] A first mounting hole may be provided on the bottom sidewall of the first circular hole. The first spring 431 and the first steel ball 432 are disposed in the first mounting hole. The first steel ball 432 is pushed into the slot 441 by the elastic force of the first spring 431. When adjusting the interpupillary distance, the first knob 42 is rotated. Whenever one slot 441 of the first connector 44 reaches the first mounting hole, the first spring 431 pushes the first steel ball 432 into the slot 441. Similarly, the second bracket 34 is provided with two protrusions below the rotating gear 351. The protrusions are provided with second mounting holes. The second spring 341 and the second steel ball 342 are disposed in the second mounting holes. The second steel ball 342 is pushed into the gap between the teeth of the rotating gear 351 by the elastic force of the second spring 341. Furthermore, through the cooperation of the spring and the steel ball, a sound will be made during adjustment, such as "click, click, click, click..." Each "click" indicates one gear. The first knob 42 and the second knob 33 can be used for multi-level adjustment to precisely adjust to the preset value.

[0062] This design places the first knob 42 and the second knob 33 adjacent to each other, allowing for easy adjustment of refractive power or interpupillary distance by simply turning the desired knob in the same position. The first knob 42 and the second knob 33 provide multi-level adjustments, precisely adjusting to preset values. Individual refractive power and interpupillary distance adjustments can be made, precisely controlling the interpupillary distance and refractive power of each eye, ensuring that the positions of the left and right eyepieces 2 match the patient's eyes, and allowing both eyes to be adjusted to their optimal usage state.

[0063] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A pupillary distance diopter rotation adjustment mechanism, comprising a main frame, characterized in that: The main frame is equipped with left and right eyepieces, and left and right displays corresponding to the left and right eyepieces; the sides of the eyepieces are equipped with a diopter adjustment component for adjusting the distance between the display and the eyepiece on one side, and an interpupillary distance adjustment component for adjusting the left or right movement of the eyepiece on one side; the diopter adjustment component is driven to the display; the interpupillary distance adjustment component is driven to the eyepiece; both the diopter adjustment component and the interpupillary distance adjustment component are rotatable; both the diopter adjustment component and the interpupillary distance adjustment component are located on the sides of the eyepieces, and the diopter adjustment component and the interpupillary distance adjustment component are integrated into one unit; The interpupillary distance adjustment assembly includes a first screw, a first knob, and a first transmission component; the first knob and the first screw are drivenly connected via the first transmission component; the first screw is drivenly connected to the eyepiece; the diopter adjustment assembly includes a movable frame; the movable frame is disposed on the eyepiece, and the display screen is disposed in the movable frame; the diopter adjustment assembly includes a second screw, a second knob, and a second transmission component; the second screw and the second knob are drivenly connected via the second transmission component; the second screw is drivenly connected to the movable frame; The mobile frame is provided with a first connecting block on its side; a second threaded block is slidably connected in the first connecting block; the second screw passes through the second threaded block and is drivenly connected to the second threaded block.

2. The pupillary distance diopter rotation adjustment mechanism according to claim 1, characterized in that, The first transmission component includes a first bracket, a first connector disposed on the first bracket, and a first drive gear; the first drive gear is located on the side of the first connector facing the eyepiece, and the first knob is located on the side of the first connector facing away from the eyepiece; both the first drive gear and the first knob are connected to the first connector.

3. The pupillary distance diopter rotation adjustment mechanism according to claim 2, characterized in that, The first bracket is provided with a first driven gear that meshes with the first drive gear; the first screw is provided with a second driven gear that meshes with the first driven gear.

4. The pupillary distance diopter rotation adjustment mechanism according to claim 2, characterized in that, The eyepiece is provided with a first threaded block; the main frame is provided with a limiting hole; the first screw passes through the limiting hole and the first threaded block, and is drivenly connected to the first threaded block.

5. The pupillary distance diopter rotation adjustment mechanism according to claim 2, characterized in that, The first connector is provided with several slots; the first bracket is provided with a first spring and a first steel ball; the first spring pushes the first steel ball into the slots.

6. The pupillary distance diopter rotation adjustment mechanism according to claim 1, characterized in that, The second transmission component includes: a second bracket disposed on the first bracket, and a second connector passing through the second bracket, the first drive gear and the first connector; the second knob is connected to the second connector.

7. The pupillary distance diopter rotation adjustment mechanism according to claim 6, characterized in that, The second transmission component further includes: a second drive gear disposed on the second connector, and a third driven gear disposed on the second screw; the second drive gear and the third driven gear are meshed together.

8. The pupillary distance diopter rotation adjustment mechanism according to claim 6, characterized in that, The second connector is provided with a rotating gear; the second bracket is provided with a second spring and a second steel ball; the second spring pushes the second steel ball into the teeth of the rotating gear.

9. The pupillary distance diopter rotation adjustment mechanism according to claim 1, characterized in that, The movable frame is provided with a first guide shaft; the eyepiece is provided with a first through hole; the first guide shaft is disposed in the first through hole.

10. The pupillary distance diopter rotation adjustment mechanism according to claim 1, characterized in that, The eyepiece is provided with a second connecting block and a second guide shaft passing through the second connecting block; the main frame is provided with a second through hole, and the two ends of the second guide shaft are respectively disposed in the second through hole.

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