Device for adjusting bending of spectacle frame

Abstract

The utility model discloses a device for adjusting the bending of a spectacle frame, which comprises a spectacle frame seat, a vertical moving seat, a base and a lifting mechanism, and the spectacle frame seat comprises a left eye nucleus seat, a right eye nucleus seat, a first left support block, a second left support block, a first right support block and a second right support block, the left eye nucleus seat and the right eye nucleus seat are provided with a left lens profiling block and a right lens profiling block which are matched with the lenses respectively, and the minimum distance between the left lens profiling block and the right lens profiling block forms the center distance of the glasses frame. A point serving as one end point of the center distance on the left lens profiling block is located on the hinged axis where the left eye nuclear seat is hinged to the second left supporting block, and a point serving as the other end point of the center distance on the right lens profiling block is located on the hinged axis where the right eye nuclear seat is hinged to the second right supporting block. According to the utility model, the purpose that the center distance is not changed while the bending of the spectacle frame is adjusted is achieved.

Description

Technical Field

[0001] The utility model relates to a glasses mould, more specifically to a device for adjusting the bending of a glasses frame. Background Art

[0002] In order to adapt to different glasses wearers, sheet metal glasses have different styles and specifications of frames according to the differences in their center distance, curvature of the frames, etc., so corresponding molds are needed to adjust the curvature of the frames.

[0003] When the existing mold adjusts the curvature of the spectacle frame, the center distance of the spectacle frame will also change. That is, when the curvature of the spectacle frame is adjusted, the center distance of the glasses will also change accordingly. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art and provide a device for adjusting the curvature of a spectacle frame, so as to achieve the adjustment of the curvature of the spectacle frame while keeping the center distance of the spectacle frame unchanged.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] The utility model provides a device for adjusting the bending of a glasses frame, comprising a glasses frame seat, an up-and-down movable seat, a base and a lifting mechanism, wherein the glasses frame seat comprises a left eye core seat and a right eye core seat, a first left support block, a second left support block, a first right support block and a second right support block which are arranged symmetrically on the left and right sides, the first left support block and the first right support block are movably connected to the base, the second left support block and the second right support block are connected to the up-and-down movable seat, the lifting mechanism is connected to the up-and-down movable seat, the left eye core seat is hinged to the first left support block and the second left support block, The right eye core seat is hinged to the first right support block and the second right support block, the left eye core seat and the right eye core seat are respectively provided with a left lens profiling block and a right lens profiling block adapted to the lenses, the minimum distance between the left lens profiling block and the right lens profiling block constitutes the center distance of the frame, the point on the left lens profiling block as one end point of the center distance is located on the hinge axis where the left eye core seat is hinged to the second left support block, and the point on the right lens profiling block as the other end point of the center distance is located on the hinge axis where the right eye core seat is hinged to the second right support block.

[0007] Furthermore, the first left support block is slidably connected to the base via a left sliding module, and the first right support block is slidably connected to the base via a right sliding module.

[0008] Further, the left sliding module includes a left sliding rail arranged along the left-right direction in the length direction, and a left sliding block slidably set on the left sliding rail, the left sliding rail is fixed on the base, and the left sliding block is fixedly connected to the first left support block; the hinge axis direction of the first left support block and the left eye core seat and the sliding direction between the first left support block and the base are perpendicular to each other, and the hinge axis direction of the second left support block and the left eye core seat and the hinge axis direction of the first left support block and the left eye core seat are parallel.

[0009] Further, the right sliding module includes a right sliding rail arranged along the left-right direction in the length direction, and a right sliding block slidably set on the right sliding rail, the right sliding rail is fixed on the base, and the right sliding block is fixedly connected to the first right support block; the hinge axis direction of the first right support block and the right eye core seat and the sliding direction between the first right support block and the base are perpendicular to each other, and the hinge axis direction of the second right support block and the right eye core seat and the hinge axis direction of the first right support block and the right eye core seat are parallel.

[0010] Furthermore, it also includes a left position adjustment component, which includes a left adjustment screw and a left fixed block, the left fixed block is fixedly connected to the up and down movable seat, the left adjustment screw is installed on the left fixed block and is threadedly connected to the second left support block; by turning the left adjustment screw, the horizontal position of the second left support block relative to the up and down movable seat can be adjusted.

[0011] Furthermore, it also includes a right position adjustment component, which includes a right adjustment screw and a right fixed block, the right fixed block is fixedly connected to the up and down movable seat, the right adjustment screw is installed on the right fixed block and is threadedly connected to the second right support block; by turning the right adjustment screw, the horizontal position of the second right support block relative to the up and down movable seat can be adjusted.

[0012] Furthermore, the up-and-down movable seat is provided with a dovetail groove, and the second left supporting block and the second right supporting block are both provided with a dovetail block portion that is movably matched with the dovetail groove.

[0013] Furthermore, the lifting mechanism includes a motor, a first synchronous wheel, a second synchronous wheel, a synchronous belt, a rotating shaft and a pushing assembly, the first synchronous wheel is connected to the output shaft of the motor, the second synchronous wheel is connected to the rotating shaft, the synchronous belt is connected to the first synchronous wheel and the second synchronous wheel, the pushing assembly is movably arranged on the rotating shaft and connected to the up and down movable seat, and when the rotating shaft rotates, the pushing assembly is driven to move vertically to move the up and down movable seat.

[0014] Furthermore, the pushing assembly includes a push cylinder and a screw guide rail, the upper end of the push cylinder is fixedly connected to the up and down moving seat, the screw guide rail is inserted from the lower end of the push cylinder and fixedly connected to the push cylinder, the screw guide rail is sleeved on the rotating shaft and threadedly connected to the rotating shaft, and when the rotating shaft rotates, the screw guide rail moves axially relative to the rotating shaft.

[0015] Furthermore, the lifting mechanism also includes a shaft balancing assembly, which includes a fixed sleeve, a plane bearing and a fastener. The rotating shaft passes through the fixed sleeve, and the fixed sleeve is fixedly connected to the base. The plane bearing is placed in the fixed sleeve, and the outer ring of the plane bearing is connected to the fixed sleeve, and the inner ring of the plane bearing is connected to the rotating shaft. The fastener is threadedly fastened to the rotating shaft to limit the axial direction of the plane bearing to a predetermined position of the rotating shaft.

[0016] Compared with the prior art, the utility model has the following beneficial effects: the utility model sets a point on the left lens profiling block as one end point of the center distance on the hinge axis where the left eye core seat and the second left support block are hinged, and sets a point on the right lens profiling block as the other end point of the center distance on the hinge axis where the right eye core seat and the second right support block are hinged. When the lifting mechanism drives the up and down moving seats to move vertically to adjust the frame curvature, the two end points of the center distance can be respectively maintained on the two hinge axes, thereby achieving the purpose of adjusting the curvature of the glasses frame while the center distance does not change.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the utility model, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 An axonometric diagram of a device for adjusting the curvature of a spectacle frame provided in a specific embodiment of the utility model;

[0020] Figure 2 A top view of a device for adjusting the bending of a glasses frame provided in a specific embodiment of the utility model;

[0021] Figure 3 for Figure 2 Sectional view at AA in the middle;

[0022] Figure 4 A schematic diagram of a portion of the structure of a device for adjusting the bending of a glasses frame provided in a specific embodiment of the utility model;

[0023] Figure 5 A partial structural exploded view of a device for adjusting the bend of a glasses frame provided in a specific embodiment of the utility model.

[0024] Reference numerals

[0025] 1. Spectacle frame seat; 11. Left eye core seat; 111. Left lens profiling block; 12. Right eye core seat; 121. Right lens profiling block; 13. First left support block; 14. Second left support block; 15. First right support block; 16. Second right support block; 17. Left sliding module; 171. Left slide rail; 172. Left slider; 18. Right sliding module; 181. Right slide rail; 182. Right slider; 2. Up and down moving seat; 21. Dovetail groove; 3. Base; 31. Top plate; 32. Inner plate; 33. Bottom plate; 34. Side plate; 4. Lifting mechanism; 41. Motor; 42. First synchronous wheel; 43. Second synchronous wheel; 44. Synchronous belt; 45. Rotating shaft; 46. Push cylinder; 47. Screw guide rail; 48. Plane bearing; 49. Fixed sleeve; 491. Fastener; 5. Left position adjustment assembly; 51. Left adjusting screw; 52. Left fixing block; 6. Right position adjustment assembly; 61. Right adjusting screw; 62. Right fixing block. DETAILED DESCRIPTION

[0026] The following will be combined with the specific embodiments of the utility model to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] It should be understood that when used in this specification and claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or collections thereof.

[0028] It should also be understood that the terms used in the utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0029] It should be further understood that the term “and / or” used in the present specification and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0030] like Figure 1-Figure 5 As shown, an embodiment of the utility model provides a device for adjusting the bend of a glasses frame, comprising a frame seat 1, an up-and-down movable seat 2, a base 3 and a lifting mechanism 4, wherein the frame seat 1 serves as a structure for placing and supporting the glasses frame, the up-and-down movable seat 2 drives the frame seat 1 to move to achieve the bend adjustment of the glasses frame, the base 3 serves as a supporting structure for the frame seat 1 and the up-and-down movable seat 2, and the lifting mechanism 4 provides a driving force for the movement of the up-and-down movable seat 2. The frame seat 1 includes a left eye core seat 11 and a right eye core seat 12, a first left support block 13, a second left support block 14, a first right support block 15 and a second right support block 16 which are arranged symmetrically on the left and right sides. The left eye core seat 11 and the right eye core seat 12 exist independently of each other and are arranged separately on the left and right sides. The first left support block 13 and the first right support block 15 are both movably connected to the base 3, the second left support block 14 and the second right support block 16 are connected to the up and down movable seat 2, and the lifting mechanism 4 is connected to the up and down movable seat 2. The left eye core seat 11 is hinged to the first left support block 13 and the second left support block 14, and the right eye core seat 12 is hinged to the first right support block 15 and the second right support block 16. The left eye core seat 11 and the right eye core seat 12 are respectively provided with a left lens profiling block 111 and a right lens profiling block 121 which are adapted to the lenses. The minimum spacing between the left lens profiling block 111 and the right lens profiling block 121 constitutes the center distance of the frame (i.e. Figure 2 The distance D1 in the middle), the point on the left lens profiling block 111 as the center distance to one of the end points (i.e. Figure 2 Point A in the figure) is located at the hinge axis (i.e. Figure 2 L1 in the right lens profiling block 121, the point on the right lens profiling block 121 as the center distance from the other end point (i.e. Figure 2 Point B in the figure) is located at the hinge axis (i.e. Figure 2 on L2).

[0031] When adjusting the frame curvature, first place the glasses frame on the left eye core seat 11 and the right eye core seat 12, and the left frame of the glasses frame corresponds to the left lens profiling block 111, and the right frame of the glasses frame corresponds to the right lens profiling block 121, and then control the lifting mechanism 4 to work, and the lifting mechanism 4 will drive the up and down moving seat 2 to move vertically, so as to move the left eye core seat 11 and the right eye core seat 12 to adjust the frame curvature of the glasses frame. Since the left eye core seat 11 and the right eye core seat 12 are in motion, point A is always on L1, and point B is always on L2. Therefore, the center distance D1 of the glasses frame will not change during the process of adjusting the frame curvature, that is, the purpose of adjusting the frame curvature while the center distance does not change is achieved.

[0032] In this embodiment, both the left eye core seat 11 and the right eye core seat 12 are square structures, and the upper surface is concave with a certain curvature. The two ends of the left edge of the left eye core seat 11 are respectively hinged to the upper ends of the two side vertical plates of the first left support block 13 through a pin shaft, and the two ends of the right edge of the left eye core seat 11 are respectively hinged to the upper ends of the two side vertical plates of the second left support block 14 through a pin shaft. The two ends of the left edge of the right eye core seat 12 are respectively hinged to the upper ends of the two side vertical plates of the second right support block 16 through a pin shaft, and the two ends of the right edge of the right eye core seat 12 are respectively hinged to the upper ends of the two side vertical plates of the first right support block 15 through a pin shaft. The second left support block 14 and the second right support block 16 are located between the first left support block 13 and the first right support block 15.

[0033] Furthermore, if Figure 4-Figure 5 As shown, the first left support block 13 is slidably connected to the base 3 via a left sliding module 17 , and the first right support block 15 is slidably connected to the base 3 via a right sliding module 18 .

[0034] Specifically, the left sliding module 17 includes a left sliding rail 171 arranged along the left-right direction in the length direction, and a left sliding block 172 slidably set on the left sliding rail 171, the left sliding rail 171 is fixed on the base 3, and the left sliding block 172 is fixedly connected to the first left support block 13; the hinge axis direction of the first left support block 13 and the left eye core seat 11 and the sliding direction between the first left support block 13 and the base 3 are perpendicular to each other, and the hinge axis direction of the second left support block 14 and the left eye core seat 11 is parallel to the hinge axis direction of the first left support block 13 and the left eye core seat 11.

[0035] Specifically, the right sliding module 18 includes a right sliding rail 181 arranged along the left-right direction in the length direction, and a right sliding block 182 slidably set on the right sliding rail 181, the right sliding rail 181 is fixed on the base 3, and the right sliding block 182 is fixedly connected to the first right support block 15; the hinge axis direction of the first right support block 15 and the right eye core seat 12 and the sliding direction between the first right support block 15 and the base 3 are perpendicular to each other, and the hinge axis direction of the second right support block 16 and the right eye core seat 12 is parallel to the hinge axis direction of the first right support block 15 and the right eye core seat 12.

[0036] In this embodiment, the base 3 includes a top plate 31, a bottom plate 33, a side plate 34 and an inner plate 32. The multiple side plates 34 are located between the top plate 31 and the bottom plate 33. The inner plate 32 is horizontally arranged in the accommodating space formed by the top plate 31, the bottom plate 33 and the side plates 34. The upper surface of the top plate 31 is arranged with two left slide rails 171 and two right slide rails 181, and two left sliders 172 are correspondingly configured to cooperate with the two left slide rails 171, and two right sliders 182 are configured to cooperate with the two right slide rails 181, so as to improve the stability of movement.

[0037] Furthermore, the device for adjusting the bending of the eyeglass frame also includes a left position adjustment component 5, which includes a left adjustment screw 51 and a left fixed block 52. The left fixed block 52 is fixedly connected to the vertical movable seat 2, and the left adjustment screw 51 is installed on the left fixed block 52 and is threadedly connected to the second left support block 14; by screwing the left adjustment screw 51, the horizontal position of the second left support block 14 relative to the vertical movable seat 2 is adjusted. The device for adjusting the bending of the eyeglass frame also includes a right position adjustment component 6, which includes a right adjustment screw 61 and a right fixed block 62. The right fixed block 62 is fixedly connected to the vertical movable seat 2, and the right adjustment screw 61 is installed on the right fixed block 62 and is threadedly connected to the second right support block 16; by screwing the right adjustment screw 61, the horizontal position of the second right support block 16 relative to the vertical movable seat 2 is adjusted. The purpose of setting the left position adjustment component 5 and the right position adjustment component 6 is to relatively adjust the left-right distance between the second left support block 14 and the second right support block 16, thereby indirectly adjusting the center distance of the frame.

[0038] It should be noted that the so-called adjustment of the center distance of the frame is determined according to the needs, and the center distance is appropriately increased or decreased. Moreover, the adjustment of the center distance is done to avoid the time of adjusting the frame bend. Generally, the frame bend is adjusted after the center distance is adjusted. It should not be understood here that the center distance is adjusted while adjusting the frame bend.

[0039] In this embodiment, in order to facilitate the position adjustment between the second left support block 14 and the second right support block 16 and the up and down movable seat 2, the up and down movable seat 2 is provided with a dovetail groove 21, and the second left support block 14 and the second right support block 16 are both provided with a dovetail block portion that moves in cooperation with the dovetail groove 21.

[0040] Furthermore, if Figure 3 As shown, the lifting mechanism 4 includes a motor 41, a first synchronous wheel 42, a second synchronous wheel 43, a synchronous belt 44, a rotating shaft 45 and a pushing component. The motor 41 is preferably a servo motor for easy control. The first synchronous wheel 42 is connected to the output shaft of the motor 41, the second synchronous wheel 43 is connected to the rotating shaft 45, the synchronous belt 44 is connected to the first synchronous wheel 42 and the second synchronous wheel 43, and the pushing component is movably arranged on the rotating shaft 45 and connected to the up and down moving seat 2. When the rotating shaft 45 rotates, it drives the pushing component to move vertically to move the up and down moving seat 2.

[0041] In order to achieve automatic adjustment of the frame curvature, the device for adjusting the frame curvature of the eyeglass frame is equipped with a controller, and the controller is used to accurately control the operation of the motor 41 to achieve the required adjustment of the frame curvature.

[0042] Furthermore, if Figure 3 As shown, the pushing assembly includes a push cylinder 46 and a screw guide rail 47. The top plate 31 is provided with a through hole for the upper end of the push cylinder 46 to pass through. The upper end of the push cylinder 46 passes through the through hole and is fixedly connected to the bottom of the up and down moving seat 2. The screw guide rail 47 is inserted from the lower end of the push cylinder 46 and is fixedly connected to the push cylinder 46. The screw guide rail 47 is sleeved on the rotating shaft 45 and is threadedly connected to the rotating shaft 45. When the rotating shaft 45 rotates, the screw guide rail 47 moves axially relative to the rotating shaft 45.

[0043] Optionally, in order to improve the stability of the vertical movement of the up-and-down moving seat 2 , a guide column penetrating the top plate 31 is provided at the bottom of the up-and-down moving seat 2 .

[0044] Furthermore, the lifting mechanism 4 also includes an axis balancing assembly, which is mainly used to improve the stability of the rotating shaft 45 during rotation. The axis balancing assembly includes a fixed sleeve 49, a plane bearing 48 and a fastener 491. The rotating shaft 45 passes through the fixed sleeve 49, the fixed sleeve 49 is fixedly connected to the base 3, the plane bearing 48 is placed in the fixed sleeve 49, and the outer ring of the plane bearing 48 is connected to the fixed sleeve 49, the inner ring of the plane bearing 48 is connected to the rotating shaft 45, and the fastener 491 is threadedly fastened to the rotating shaft 45 to limit the plane bearing 48 axially to a predetermined position of the rotating shaft 45.

[0045] In this embodiment, in order to save space and make the overall structure more compact, the motor 41 is installed in the accommodation space formed by the top plate 31, the bottom plate 33 and the side plate 34, and the inner plate 32 divides the accommodation space into an upper space and a lower space. The motor 41 is fixed in the upper space, and the first synchronous wheel 42 and the second synchronous wheel 43 are arranged in the lower space. The output shaft of the motor 41 passes through the inner plate 32 and is connected to the first synchronous wheel 42 in the lower space. The pushing assembly and the shaft balancing assembly are located in the upper space, and the lower end of the rotating shaft 45 passes through the inner plate 32 and is connected to the second synchronous wheel 43 in the lower space.

[0046] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the utility model, and these modifications or replacements should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A device for adjusting the curvature of a spectacle frame, characterized in that: The invention comprises a frame seat, an up-and-down movable seat, a base and a lifting mechanism, wherein the frame seat comprises a left eye core seat and a right eye core seat, a first left support block, a second left support block, a first right support block and a second right support block which are arranged symmetrically on the left and right sides, the first left support block and the first right support block are movably connected to the base, the second left support block and the second right support block are connected to the up-and-down movable seat, the lifting mechanism is connected to the up-and-down movable seat, the left eye core seat is hinged to the first left support block and the second left support block, the right eye core seat is hinged to the first left support block and the second left support block, A right support block is hinged to the second right support block, the left eye core seat and the right eye core seat are respectively provided with a left lens profiling block and a right lens profiling block adapted to the lenses, the minimum distance between the left lens profiling block and the right lens profiling block constitutes the center distance of the frame, the point on the left lens profiling block as one end point of the center distance is located on the hinge axis where the left eye core seat and the second left support block are hinged, and the point on the right lens profiling block as the other end point of the center distance is located on the hinge axis where the right eye core seat and the second right support block are hinged.

2. The device for adjusting the curvature of the eyeglass frame according to claim 1, characterized in that: The first left support block is slidably connected to the base via a left sliding module, and the first right support block is slidably connected to the base via a right sliding module.

3. The device for adjusting the curvature of the eyeglass frame according to claim 2, characterized in that: The left sliding module includes a left sliding rail arranged along the left and right directions in the length direction, and a left sliding block slidably set on the left sliding rail, the left sliding rail is fixed on the base, and the left sliding block is fixedly connected to the first left support block; the hinge axis direction of the first left support block and the left eye core seat is perpendicular to the sliding direction between the first left support block and the base, and the hinge axis direction of the second left support block and the left eye core seat is parallel to the hinge axis direction of the first left support block and the left eye core seat.

4. The device for adjusting the curvature of the eyeglass frame according to claim 2, characterized in that: The right sliding module includes a right sliding rail arranged along the left-right direction in the length direction, and a right sliding block slidably set on the right sliding rail, the right sliding rail is fixed on the base, and the right sliding block is fixedly connected to the first right support block; the hinge axis direction of the first right support block and the right eye core seat and the sliding direction between the first right support block and the base are perpendicular to each other, and the hinge axis direction of the second right support block and the right eye core seat and the hinge axis direction of the first right support block and the right eye core seat are parallel.

5. The device for adjusting the curvature of the eyeglass frame according to claim 1, characterized in that: It also includes a left position adjustment component, which includes a left adjustment screw and a left fixed block. The left fixed block is fixedly connected to the up and down movable seat. The left adjustment screw is installed on the left fixed block and is threadedly connected to the second left support block. By turning the left adjustment screw, the horizontal position of the second left support block relative to the up and down movable seat can be adjusted.

6. The device for adjusting the curvature of the eyeglass frame according to claim 5, characterized in that: It also includes a right position adjustment component, which includes a right adjustment screw and a right fixed block. The right fixed block is fixedly connected to the up and down movable seat, and the right adjustment screw is installed on the right fixed block and is threadedly connected to the second right support block; by turning the right adjustment screw, the horizontal position of the second right support block relative to the up and down movable seat can be adjusted.

7. The device for adjusting the curvature of the eyeglass frame according to claim 6, characterized in that: The up-and-down movable seat is provided with a dovetail groove, and the second left supporting block and the second right supporting block are both provided with a dovetail block portion that is movably matched with the dovetail groove.

8. The device for adjusting the curvature of a spectacle frame according to any one of claims 1 to 7, characterized in that: The lifting mechanism includes a motor, a first synchronous wheel, a second synchronous wheel, a synchronous belt, a rotating shaft and a pushing component. The first synchronous wheel is connected to the output shaft of the motor, the second synchronous wheel is connected to the rotating shaft, the synchronous belt is connected to the first synchronous wheel and the second synchronous wheel, the pushing component is movably arranged on the rotating shaft and connected to the up and down moving seat, and when the rotating shaft rotates, the pushing component is driven to move vertically to move the up and down moving seat.

9. The device for adjusting the curvature of the eyeglass frame according to claim 8, characterized in that: The pushing assembly includes a push cylinder and a screw guide rail. The upper end of the push cylinder is fixedly connected to the up and down moving seat. The screw guide rail is inserted from the lower end of the push cylinder and fixedly connected to the push cylinder. The screw guide rail is sleeved on the rotating shaft and threadedly connected to the rotating shaft. When the rotating shaft rotates, the screw guide rail moves axially relative to the rotating shaft.

10. The device for adjusting the curvature of the eyeglass frame according to claim 8, characterized in that: The lifting mechanism also includes an axis balancing assembly, which includes a fixed sleeve, a plane bearing and a fastener. The rotating shaft passes through the fixed sleeve, and the fixed sleeve is fixedly connected to the base. The plane bearing is placed in the fixed sleeve, and the outer ring of the plane bearing is connected to the fixed sleeve, and the inner ring of the plane bearing is connected to the rotating shaft. The fastener is threadedly fastened on the rotating shaft to limit the axial direction of the plane bearing to a predetermined position of the rotating shaft.

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