Lens grinding position control mechanism

Abstract

This invention discloses a lens polishing position control mechanism. The key technical features include a frame with a horizontal moving stage for holding lenses that slides along the frame. A lead screw assembly is mounted on the frame, comprising a drive motor and a reciprocating moving component. A magnetic component is fixed to the horizontal moving stage for magnetic attraction and movement with the moving component, thus driving the horizontal moving stage back and forth. Magnetic attraction is used to link and separate the moving component of the lead screw assembly and the horizontal moving stage, satisfying both the requirement for rapid movement of the horizontal moving stage on the frame and the requirement for precise reciprocating movement of the horizontal moving stage on a V-shaped polishing stone.

Description

Technical Field

[0001] This invention relates to the field of lens polishing, and more specifically, to a lens polishing position control mechanism. Background Technology

[0002] Existing spectacle lens processing instruments clamp the lens onto a chuck, then rotate the lens using a model with the same shape as the spectacle frame, and use a grinding stone to grind away the outer edge to make it into the shape of the model.

[0003] like Figure 1 As shown, for some lenses 101 that are thicker or have curved edges, a secondary grinding process is required to thin the sides of the ground lens 101. This ensures that the thickness of the lens 101's edge matches the curvature of the frame. The purpose of this is that, for thicker lenses 101, after the curved edges are thinned, they can be matched with thinner frames, making the glasses more comfortable and aesthetically pleasing.

[0004] Then, the existing eyeglass lens processing instruments use a horizontal transfer table that slides on the frame. After the lens is clamped on the horizontal transfer table, it is moved to the top of the corresponding grinding stone by manual pulling, and then the outer edge is rough ground and fine ground.

[0005] However, the process of thinning the curved side of the lens requires the lens to move back and forth at a high frequency in a horizontal position according to a controlled trajectory on a V-shaped grinding stone to achieve the purpose of side grinding.

[0006] However, existing eyeglass lens processing instruments cannot simultaneously achieve the effect of rapidly moving the lens horizontally to the rough grinding station while grinding the outer edge of the lens, and moving the lens back and forth while grinding the side of the V-shaped grinding stone. Summary of the Invention

[0007] The purpose of this invention is to provide a lens grinding position control mechanism that uses magnetic attraction to link and separate the moving part of the lead screw assembly and the horizontal moving stage, which satisfies the requirement that the horizontal moving stage can move quickly on the frame and also meets the requirement of the horizontal moving stage to make fine reciprocating movements on the V-shaped grinding stone.

[0008] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0009] A lens polishing position control mechanism includes a frame, a horizontal moving stage for holding lenses slidably on the frame, a lead screw assembly mounted on the frame, the lead screw assembly including a drive motor and a reciprocating moving component, and a magnetic component fixed to the horizontal moving stage for magnetic attraction and fixed movement with the moving component to drive the horizontal moving stage to move back and forth.

[0010] By adopting the above technical solution, the lens can be moved quickly and horizontally over a large span during the outer surface grinding and made up to be moved horizontally with fine adjustments during the side arc grinding. Through the magnetic connection, the two grinding methods can be switched freely during horizontal movement.

[0011] Preferably, the frame includes coaxially arranged grinding stones and V-shaped grinding stones, with the V-shaped grinding stones located on the front side of the frame and the lead screw assembly located on the rear side of the frame.

[0012] By adopting the above technical solution, the lead screw assembly is located on the rear side of the frame, providing more workpieces for the grinding station and facilitating the installation and removal of lenses at the grinding station.

[0013] Preferably, the frame is fixed with a sliding sleeve, and the horizontal moving table is fixed with a sliding rod, which slides through the sliding sleeve.

[0014] By adopting the above technical solution, the sleeve and slide rod's interlocking relationship makes the horizontal movement of the horizontal moving platform more stable.

[0015] Preferably, the drive motor is a through-type lead screw motor, and the moving part is a lead screw component that passes through the through-type lead screw motor; a slider is fixed at one end of the lead screw component, and a groove is opened on the frame, the length direction of the groove is parallel to the length direction of the lead screw component, and the slider slides in the groove; a magnetic metal block is fixed at the other end of the lead screw component.

[0016] By adopting the above technical solution, the through-type lead screw motor is fixed to the frame, so the lead screw moves back and forth. The design of the slider and the groove makes the back and forth movement trajectory of the lead screw more stable and precise. The metal block is used to magnetically attract the magnetic components, thereby driving the horizontal moving table to move quickly and slightly.

[0017] The working principle of a through-screw motor: A through-screw stepper motor integrates the nut and the motor rotor into one unit, with the screw shaft passing through the center of the motor rotor. In use, with the screw fixed and anti-rotation measures in place, when the motor is powered on and the rotor rotates, the motor will move linearly along the screw; conversely, if the motor is fixed and the screw is anti-rotation measures in place, the screw will move linearly.

[0018] Preferably, the frame is equipped with a contact switch that triggers the through-type lead screw motor to stop in a contact manner when the slider is reset.

[0019] By adopting the above technical solution, the contact switch is designed to ensure that the lead screw assembly returns to its initial position before stopping. The purpose of this is that if the lead screw assembly could stop freely at the extended position, it would interfere with the manual adjustment of the horizontal position of the horizontal moving table. This is because the extended position shortens the distance between the moving part and the magnetic part, thus reducing the adjustable distance of the horizontal moving table. Since the manual adjustment range of the horizontal moving table is relatively large, the lead screw assembly should return to its initial position to give the horizontal moving table more room to move when the thinning process of the V-shaped grinding stone is stopped.

[0020] Preferably, the drive motor is a servo motor or a stepper motor.

[0021] By adopting the above technical solutions, servo motors and stepper motors can work well with the control system, which can be a PLC, a microcontroller, or a chip, to perform precise movements under the program of the control system.

[0022] Preferably, the magnetic surfaces of both the magnetic component and the movable component are flat vertical surfaces.

[0023] By adopting the above technical solution, the advantage of a vertical surface is that it reduces the adhesion of powder and debris, ensuring that there are no foreign objects in the middle when the magnetic and moving parts are magnetically attracted, making the position of the moving horizontal stage more precise. The advantage of a vertical surface over an inclined surface is that an inclined surface is prone to dust accumulation. Since a large amount of dust is generated during lens polishing, if the magnetic attraction surface is inclined, a layer of dust will easily accumulate. A vertical surface effectively avoids this situation.

[0024] Preferably, the magnetic component is a powerful magnet.

[0025] By adopting the above technical solutions, strong magnets with high magnetic properties can be produced, such as neodymium iron boron magnets.

[0026] Preferably, the magnetic component is an electromagnet.

[0027] By adopting the above technical solution, the advantages of electromagnets are that they generate magnetism when energized. This means that if the horizontal moving table comes into contact with the magnetic component during manual translation, it will not be immediately attracted to the magnet, making it more convenient to grind and adjust the position of the lens. Secondly, the processing room in an optical shop contains many small screws needed for eyeglass frames. Because of their small size, they are not easily noticed when they are scattered and attracted to the magnetic component. If a screw is located between the magnetic component and the moving component during lens thinning, it will cause the horizontal moving table to be mispositioned during back-and-forth movement, resulting in lens processing failure. Electromagnets solve this problem well. Since electromagnets are not magnetic when not in use, even if small screws or other metal parts fall from above, they will not be attracted to the magnet. This avoids the occurrence of foreign metal objects between the magnetic component and the moving component, thus improving the success rate of thinning the lens side.

[0028] Preferably, the electromagnet and the drive motor are equipped with a switch button for synchronous opening and closing.

[0029] By adopting the above technical solution, the switch button is to ensure that the electromagnet and the drive motor are turned on and off together. Attached Figure Description

[0030] Figure 1 This is a before-and-after comparison diagram of thinning the side of a lens using existing technology;

[0031] Figure 2 This is a schematic diagram of the front side of the grinder in Example 1;

[0032] Figure 3 This is a schematic diagram of the rear side of the grinder in Example 1;

[0033] Figure 4 This is an exploded view of the frame and horizontal moving platform in Example 1;

[0034] Figure 5 This is a schematic diagram of the connection relationship between the slider and the lead screw in Example 1;

[0035] Figure 6 This is a schematic diagram of the grinding machine in Example 2.

[0036] In the picture:

[0037] 1. Rack;

[0038] 2. Horizontal moving platform;

[0039] 31. Sliding sleeve; 32. Sliding rod;

[0040] 41. Drive motor; 42. Moving part; 43. Metal block; 44. Vertical surface; 45. Slider; 46. Slide rail; 47. Contact switch;

[0041] 5. Magnetic components;

[0042] 61. Grinding and cutting stones; 62. V-shaped grinding stones;

[0043] 71. Electromagnet; 72. Switch button;

[0044] 101. Lens. Detailed Implementation

[0045] The present invention will be further described in detail below with reference to the accompanying drawings.

[0046] Example 1: A lens grinding position control mechanism, referring to... Figures 2-5 It includes a frame 1, and the bottom of the frame 1 is provided with 5 support rods, which lift the frame 1.

[0047] The frame 1 has a horizontal moving stage 2 that slides along it; the horizontal moving stage 2 is used to hold the lens 101 and drive the lens 101 to rotate on the grinding station.

[0048] The specific sliding relationship between the frame 1 and the horizontal moving stage 2 is as follows: the frame 1 is fixed with a sliding sleeve 31, and the horizontal moving stage 2 is fixed with a sliding rod 32. The sliding rod 32 slides through the sliding sleeve 31. The sliding rod 32 and the sliding sleeve 31 are in clearance fit. Therefore, based on the sliding relationship between the sliding rod 32 and the sliding sleeve 31, the horizontal moving stage 2 can move back and forth horizontally on the frame 1.

[0049] The horizontal movement of the horizontal moving stage 2 is to adjust the grinding position of the lens 101.

[0050] The frame 1 includes coaxially arranged grinding stones 61 and V-shaped grinding stones 62; the grinding stones 61 and V-shaped grinding stones 62 are fixed by the same rotating shaft and the rotating shaft rotates under the drive of a motor.

[0051] The grinding stone 61 cuts the lens 101 into the required shape according to the model, while the V-shaped grinding stone 62 has a V-shaped groove in the middle.

[0052] The grinding stones 61 generally have two types: coarse grinding stones and fine grinding stones. The initial lens 101 is generally circular. After the initial lens 101 is coarsely ground to achieve the shape of the lens 101 model, the lens 101 is quickly moved above the fine grinding stones by the rapidly moving horizontal stage 2. The fine grinding stones then refine the edges of the lens 101. Since both the coarse and fine grinding stones grind the outer edges of the lens 101, this process is called primary grinding.

[0053] After the lens 101 has been ground once on the grinding stone 61, it needs to be ground a second time on the V-shaped grinding stone 62.

[0054] During the secondary grinding, the lens 101 is located in the V-groove of the V-shaped grinding stone 62. The side of the lens 101 needs to move a small distance towards the side wall of the V-groove at a high frequency, which is a fine-tuning movement, so as to achieve the purpose of thinning the side of the lens 101. In addition, the lens 101 itself is rotating during the secondary grinding. The degree of thinning of different positions of the lens 101 is different. Therefore, when the lens 101 is ground on the V-shaped grinding stone 62, it needs to make a fine and high-frequency horizontal movement, so that the side of the lens 101 presents a thinner arc surface.

[0055] When grinding with the V-shaped grinding stone 62, more precise movement of the horizontal moving stage 2 is required. In this design, a lead screw assembly is used to achieve the following specific structure:

[0056] In terms of orientation, the V-shaped grinding stone 62 is located on the front side of the frame 1, and the lead screw assembly is located on the rear side of the frame 1.

[0057] The lead screw assembly includes a drive motor 41 and a reciprocating moving part 42. The drive motor 41 is a through-type lead screw motor, which is a stepper motor. The moving part 42 is a lead screw component that passes through the lead screw stepper motor. The moving part 42 is a threaded rod with a small thread pitch.

[0058] The through-type lead screw motor is fixed to the outer wall of the sliding sleeve 31, which means that the drive motor 41 and the frame 1 are fixed. Therefore, when the through-type lead screw motor is started, the moving part 42 can move back and forth.

[0059] A slider 45 is fixed to one end of the movable component 42. The frame 1 has a slide groove 46, the length direction of which is parallel to the length direction of the lead screw. A protrusion is fixed to the side of the slider 45, and the protrusion slides in the slide groove 46. The slider 45 moves synchronously with the lead screw along the slide groove 46.

[0060] It is obvious that fine-tuning can be achieved through the lead screw assembly. The other end of the lead screw is fixed with a magnetic metal block 43, which is cylindrical.

[0061] The horizontal moving stage 2 is fixed with an ear plate, and a magnetic component 5, which is a powerful magnet, is fixed on the ear plate. The magnetic component 5 is disc-shaped. The end faces of the metal block 43 and the magnetic component 5 are circular vertical surfaces 44, and these two vertical surfaces 44 are magnetic attraction surfaces.

[0062] When the metal block 43 and the magnetic component 5 are attracted to each other, the back-and-forth movement of the lead screw assembly can drive the horizontal moving table 2 to make fine adjustments and translations on the frame 1.

[0063] The frame 1 is equipped with a contact switch 47 that triggers the through-type lead screw motor to stop when the slider 45 is reset.

[0064] The contact switch 47 is equipped with a pressure plate, on which a roller is mounted. When the slider 45 squeezes the roller, the pressure plate presses the elastic button of the contact switch 47, and the contact switch 47 sends a signal to the drive motor 41, causing the drive motor 41 to turn off. At this time, the metal block 43 moves away to the initial position where it maintains the furthest distance from the magnetic component 5.

[0065] Working principle: After the initial lens 101 is clamped on the horizontal moving stage 2, the magnetic component 5 and the metal block 43 are separated. Therefore, the worker can manually move the horizontal moving stage 2 quickly. In other embodiments, the horizontal moving stage 2 can also adopt a rack and pinion linkage relationship, driven by a motor, to quickly move above the grinding stone 61, completing the rapid positioning of the grinding stone 61. The initial lens 101 moves to the grinding stone 61 and is ground according to the model shape.

[0066] Afterwards, the lead screw assembly is activated, and the lead screw extends to the work position that cooperates with the V-shaped grinding stone 62, moving the horizontal moving table 2 so that the metal block 43 and the magnetic component 5 are magnetically attracted and fixed. At this time, the fine adjustment movement of the lead screw assembly can make the lens 101 for external grinding thin and grind within the V-shape.

[0067] The advantage of this design is that the lens 101 can move quickly and horizontally over a large span during the outer surface grinding and make fine adjustments horizontally during the side arc grinding. These two different horizontal movement methods coexist, and the two grinding methods can be freely switched during horizontal movement through a magnetic connection.

[0068] Example 2, a lens polishing position control mechanism, referring to Figure 6 The difference between this and embodiment 1 is that the magnetic component 5 is an electromagnet 71, which is mounted on the ear plate; the electromagnet 71 and the drive motor 41 are provided with a switch button 72 for synchronous opening and closing, which connects the power supplies of the electromagnet 71 and the drive motor 41 in series and is the main switch button 72 for the power supplies of both.

[0069] After the 72 switch buttons are activated, the magnetic component 5 is energized and generates magnetism, and the drive motor 41 can be started according to the program.

[0070] After the switch button 72 is turned off, the magnetic component 5 is demagnetized, and the drive motor 41 stops rotating.

[0071] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A lens grinding position control mechanism, comprising a frame (1), wherein a horizontal moving stage (2) for holding a lens (101) slides on the frame (1), characterized in that: The frame (1) is equipped with a lead screw assembly, which includes a drive motor (41) and a reciprocating moving part (42). The horizontal moving table (2) is fixed with a magnetic part (5) for magnetically attracting and moving the moving part (42) to drive the horizontal moving table (2) to move back and forth. The frame (1) is fixed with a sliding sleeve (31), and the horizontal moving table (2) is fixed with a sliding rod (32). The sliding rod (32) slides through the sliding sleeve (31). The drive motor (41) is a through-type lead screw motor, and the moving part (42) is a lead screw part that passes through the through-type lead screw motor; A slider (45) is fixed at one end of the lead screw, and a groove (46) is provided on the frame (1). The length direction of the groove (46) is parallel to the length direction of the lead screw, and the slider (45) slides in the groove (46). The other end of the lead screw is fixed with a magnetic metal block (43).

2. The lens grinding position control mechanism according to claim 1, characterized in that: The frame (1) includes coaxially arranged grinding stones (61) and V-shaped grinding stones (62), with the V-shaped grinding stones (62) located on the front side of the frame (1) and the lead screw assembly located on the rear side of the frame (1).

3. The lens grinding position control mechanism according to claim 1, characterized in that: The frame (1) is equipped with a contact switch (47) that triggers the through-type lead screw motor to stop when the slider (45) is reset.

4. The lens grinding position control mechanism according to claim 1, characterized in that: The drive motor (41) is a servo motor or a stepper motor.

5. The lens grinding position control mechanism according to claim 1, characterized in that: The magnetic attraction surfaces of both the magnetic component (5) and the movable component (42) are flat vertical surfaces (44).

6. The lens grinding position control mechanism according to claim 1, characterized in that: The magnetic component (5) is a powerful magnet.

7. The lens grinding position control mechanism according to claim 1, characterized in that: The magnetic component (5) is an electromagnet (71).

8. The lens grinding position control mechanism according to claim 7, characterized in that: The electromagnet (71) and the drive motor (41) are equipped with a switch button (72) for synchronous opening and closing.

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