Positioning assembly for lens edging

Abstract

The application discloses a lens polishing edge positioning assembly, and technical scheme points are as follows: a rack is provided, the rack is provided with a horizontal conveying table, the horizontal conveying table is provided with a chuck for clamping a lens and a clamp for clamping a model, the horizontal conveying table is provided with an angle sensor for detecting the rotation of a vertical plane, the angle sensor is provided with a rotating rod, the rotating rod is fixed with a swing rod which rotates downward under the action of gravity, one end of the swing rod is in contact with the upper end of the model in the clamp, the swing rod swings in the way of contacting the edge of the model when the model rotates, and thus the angle change in the swing process is recorded, and the scanning and positioning of the edge of the model are completed.

Description

Technical Field

[0001] This invention relates to the field of lens polishing, and more specifically, to a positioning component for polishing the edge of a lens. Background Technology

[0002] Most existing lens polishing equipment is based on profile polishing. For example, Chinese patent document with application number CN00264825.3, whose patent name is a spectacle lens processing instrument, describes an embodiment in its specification as follows: "A horizontal transfer table 10 has a chuck 11 for clamping spectacle lens 3, and a model fixture 12 for clamping model 4 on one side. The horizontal transfer table 10 is attached to the horizontal transfer chuck with bearings and moves left and right. The support frame 25 is combined with the weight adjustment rod 13. The weight adjustment rod 13 is clamped on the adjustment fixture 14 and the weight of the horizontal transfer table 10 is changed by the elasticity of the spring 18."

[0003] After grinding the outer contour of the lens, the sides of the lens need to be thinned, such as... 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] When grinding the sides of lenses, the thickness of the grinding varies in different areas. Therefore, it's necessary to accurately position the lens at its angle to allow the grinding machine's control system to precisely adjust the thickness of the grinding on the lens sides. However, existing small lens grinding machines included in eyeglasses lack the ability to position the lens edges at an angle, necessitating the return of the lens to the manufacturer for further grinding. Therefore, most small grinding machines on the market lack the ability to scan and position the lens edges. Summary of the Invention

[0005] The purpose of this invention is to provide a positioning component for grinding the edge of a lens. By swinging a swing rod along the rotation of the model, the swing rod swings in a manner that abuts against the edge of the model, thereby recording the angle change during the swing process and completing the scanning and positioning of the edge of the model. This allows even a small grinding machine to complete the scanning work before grinding the side of the lens, and the side grinding and positioning of the lens can be completed in an optical shop.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] A positioning assembly for grinding the edge of a lens includes a frame with a horizontal transfer stage that slides along the frame. The horizontal transfer stage includes a chuck for holding eyeglass lenses and a fixture for holding a model. The horizontal transfer stage is equipped with an angle sensor for detecting vertical rotation. The angle sensor includes a rotating rod with a swing rod fixed to it that rotates downward under gravity. One end of the swing rod abuts against the upper end of the model in the fixture.

[0008] By adopting the above technical solution, (1) the model is the sample shape of the lens. Therefore, after polishing the lens with the model as a reference, the change in the outer contour curvature of the lens is the same as that of the model. The model and the lens held in the horizontal transfer table are aligned along the rotation axis. Therefore, scanning and positioning the model contour is equivalent to scanning and positioning the polished lens contour. There are two advantages to this operation. First, the side polishing process of the lens is after the lens contour polishing. Therefore, the process connection is extremely smooth. The model and the lens have not moved in the horizontal transfer table position. Therefore, the scanning accuracy is extremely high. Second, the lens position has a large space occupied by the grinding stone, so the scanning space is small. The model position is relatively open, and scanning is more convenient. Therefore, scanning and positioning the model position is more beneficial.

[0009] (2) The angle sensor is pressed against the model by the swing rod. When the model rotates, the swing rod swings along the model outline to different degrees, so that the angle sensor records the angle data values ​​of each point of the model and completes the shape scanning and positioning of the model outline, so that the control system can give the lens side to different degrees of thinning according to the model position obtained by the angle sensor.

[0010] Preferably, a horizontal bar is fixed to one end of the swing rod that abuts against the model. The length of the horizontal bar is at least three times the thickness of the model, and the length direction of the horizontal bar is consistent with the thickness direction of the model. The horizontal bar abuts against the upper end of the model.

[0011] By adopting the above technical solution, the crossbar increases the contact points in the thickness direction of the model, so that the swinging rod's lateral swing will not affect the angle reading.

[0012] Preferably, the rotating rod is provided with an elastic element that drives the swing rod to press against the model in the fixture.

[0013] By adopting the above technical solution, the elastic element provides a persistent driving force, which makes the swing arm fit tightly against the outer edge of the model, ensuring the accuracy of angle reading.

[0014] Preferably, the elastic element is a torsion spring, which is sleeved on the rotating rod. A support rod is fixed to the outer wall of the rotating rod. One end of the torsion spring is fixed to the horizontal transfer table, and the other end of the torsion spring abuts against the support rod.

[0015] By adopting the above technical solution, the torsion spring can provide a stable driving force.

[0016] Preferably, the fixture includes a plug and two sockets for the model to be inserted.

[0017] By adopting the above technical solution, the three-point interlocking relationship allows the model to be stably mounted on the fixture.

[0018] Preferably, a lifting arm is rotatably connected to the outer wall of the horizontal transfer table. The lifting arm is equipped with a damping ring to achieve positioning at the stop position. The lifting arm is located below the swing rod. When the lifting arm rotates upward, it lifts the swing rod to separate the swing rod from the model in the fixture.

[0019] By adopting the above technical solution, the purpose of raising the arm is to separate the swing arm from the model. Since there are multiple grinding processes on the grinding machine, and other processes do not require scanning the model outline, it is necessary to separate the swing arm from the model in other processes to reduce the interference of the swing arm in other processes.

[0020] Preferably, the side of the lifting arm that is used to contact the swing arm is fixed with a magnetic block for magnetically attracting the swing arm.

[0021] By adopting the above technical solution, when the arm is rotated to a vertical position, the swing arm is prone to fall freely in the opposite direction due to the lack of support. In this case, firstly, the swing arm will collide with other parts of the equipment and cause interference. Secondly, after the swing arm rotates and falls, when the staff needs to scan the edge of the model, they need to flip the swing arm from back to front in a large manner, which is inconvenient to operate.

[0022] To avoid the above problems, a magnetic block is used to magnetically attract the swing rod and the lifting arm, keeping them fixed together. Even if the lifting arm is rotated vertically after lifting, the swing rod and the lifting arm will not automatically separate, thus solving the above-mentioned technical defects.

[0023] Preferably, the frame is equipped with a rotating shaft, on which grinding stones and V-shaped grinding stones are fixed, and the horizontal transfer table is equipped with a lifting and lowering sensor for the lower end of the model in the fixture to abut.

[0024] By adopting the above technical solution, the lifting sensing part is used to polish the lens contour. By changing the vertical position of the model in the lifting sensing part, the lens is polished on the grinding stone to produce the same contour as the model.

[0025] V-shaped grinding stones are used for thinning the sides of lenses.

[0026] Preferably, the frame is equipped with an air pump, which includes a housing fixed to the frame and blades mounted on the rotating shaft; the air pump's outlet pipe faces the edge of the model in the fixture, the outlet pipe is set downwards, and the outlet pipe and the swing rod are located on both sides of the model.

[0027] By adopting the above technical solution, the air pump uses the rotating shaft as the power source to spray air to the side of the model. The purpose is to ensure that the scanned edge of the model is smooth and free of foreign objects, and to avoid errors caused by foreign objects or dust adhering to the edge of the model. In order to avoid the airflow interfering with the swing rod, the air inlet is located on the other side of the swing rod opposite the model, and the airflow blows downward, while the swing rod is above the model. This air blowing setting effectively avoids the airflow interfering with the swing rod.

[0028] Preferably, the frame is fixed with a baffle, the grinding stone and V-shaped grinding stone are located on one side of the baffle, and the air pump inlet pipe is located on the other side of the baffle.

[0029] By adopting the above technical solution, the baffle separates the air pump's air inlet pipe from the grinding station. Since the grinding station has a large amount of dust, isolating the air inlet pipe with the baffle can effectively solve this problem. 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 structure of Example 1;

[0032] Figure 3 This is a schematic diagram showing the positional relationship of the angle sensor on the horizontal transfer stage in Embodiment 1;

[0033] Figure 4 This is a front view of the lifting arm separation swing rod and the model in Embodiment 1;

[0034] Figure 5 This is a schematic diagram showing the position of the damping ring in the lifting arm of Example 1;

[0035] Figure 6 This is an exploded view of the model and fixture of Example 1;

[0036] Figure 7 This is a schematic diagram of the structure of Example 2.

[0037] In the picture:

[0038] 1. Rack;

[0039] 2. Horizontal transfer table; 21. Chuck;

[0040] 3. Fixture; 31. Insert block; 32. Insertion hole;

[0041] 4. Angle sensor; 41. Rotating rod; 42. Swing rod; 43. Crossbar; 44. Torsion spring; 45. Support rod;

[0042] 5. Lifting arm; 51. Damping ring; 52. Magnetic block;

[0043] 61. Grinding stone; 62. V-shaped grinding stone; 63. Lifting sensor;

[0044] 7. Air pump; 71. Air outlet pipe; 72. Air inlet pipe; 73. Baffle;

[0045] 101. Lens; 102. Model. Detailed Implementation

[0046] The present invention will be further described in detail below with reference to the accompanying drawings.

[0047] Example 1: A positioning component for grinding the edge of a lens, referring to... Figures 1-6 The system includes a frame 1, a horizontal transfer stage 2 that slides on the frame 1, a sliding rod that is fixed on the horizontal transfer stage 2, and a sliding sleeve that is fixed on the frame 1. The horizontal transfer stage 2 and the frame 1 move back and forth laterally on the horizontal plane through the sliding relationship of the sliding rod and the sliding sleeve. The back and forth movement can be driven by a stepper motor or a servo motor.

[0048] Reference Figure 3 The horizontal transfer stage 2 includes a chuck 21 for clamping spectacle lenses 101 and a clamp 3 for clamping model 102. The chuck 21 includes two coaxial and laterally arranged push rods. The opposing ends of the two push rods fix the chuck 21, which positions and clamps the lens 101. The clamp 3 is installed at the other end of the push rod on the left side. The clamp 3 fixes the model 102. The model 102 and the lens 101 are fixed by the coaxial push rods, so when the push rods rotate, the model 102 and the lens 101 can rotate synchronously.

[0049] For the structural reference of fixture 3 Figure 6 The fixture 3 includes a plug block 31 and a socket 32 ​​for the model 102 to be inserted. There are two sockets 32. The plug block 31 is a cylindrical structure or a cylindrical structure. The two sockets 32 are round holes. The diameter of the sockets 32 is smaller than the diameter of the plug block 31, and the two sockets 32 are located on both sides of the plug block 31.

[0050] Model 102 has a rod with an insertion hole 32 and a hole into which the insertion block 31 is inserted; the model 102 is fixed in the clamp 3 by the mutual insertion and fixing relationship between the model 102 and the clamp 3.

[0051] Model 102 can be detached from clamp 3 by pulling it out.

[0052] When polishing lens 101, the outer contour is ground first.

[0053] Reference Figures 2-3The frame 1 is equipped with a rotating shaft, on which a grinding stone 61 and a V-shaped grinding stone 62 are fixed. The grinding stone 61 and the V-shaped grinding stone 62 rotate synchronously under the drive of a motor. When the lens 101 is placed on the grinding stone 61, it is used for grinding the outer contour.

[0054] The main feature is that a lifting sensor 63 is installed on the horizontal transfer table 2. The lifting sensor 63 is located at the lower end of the model 102. The lifting sensor 63 senses the vertical position of the bottom of the model 102 and controls the grinding stone 61 to complete the grinding of the outer contour of the lens 101. This structure is a conventional technology in the field and will not be described in detail here.

[0055] After the outer contour of lens 101 is ground, the sides of lens 101 need to be thinned. Because the amount of grinding required varies at different locations along the edge of lens 101, it is necessary to scan the edges of model 102. The specific structure is as follows:

[0056] Reference Figures 2-3 The horizontal transfer stage 2 is equipped with an angle sensor 4 for detecting vertical plane rotation. The angle sensor 4 includes a rotating rod 41, and a swing rod 42 that rotates downward under the action of gravity is fixed to the rotating rod 41. Under the action of its own weight, the swing rod 42 rotates downward. Therefore, the end of the swing rod 42 away from the angle sensor 4 is exactly in contact with the upper end of the model 102 in the fixture 3. The angle sensor 4 detects the angle of the edge of the model 102 by the swing of the swing rod 42.

[0057] Since model 102 and lens 101 rotate synchronously, scanning and positioning the edge of model 102 is equivalent to scanning and positioning the edge of lens 101.

[0058] When model 102 rotates, the swing rod 42 swings to different degrees along the contour of model 102, causing the angle sensor 4 to record the angle data values ​​of each point on model 102, thus completing the shape scanning and positioning of the contour of model 102.

[0059] Angle sensor 4 is connected to the control system, transmitting the detected angle data to the control system to form a contour graphic. The control system stores the amount of cutting by each point of the contour of model 102 on V-shaped grinding stone 62. Therefore, the control system controls the horizontal transfer stage 2 to perform a slight translation relative to V-shaped grinding stone 62, so that the side of lens 101 contacts the V-shaped groove wall of V-shaped grinding stone 62, completing the grinding of the side.

[0060] A horizontal bar 43 is fixed to one end of the swing rod 42 that abuts against the model 102. The length of the horizontal bar 43 is 12 times the thickness of the model 102. The length direction of the horizontal bar 43 is consistent with the thickness direction of the model 102. The horizontal bar 43 abuts against the upper end of the model 102.

[0061] The swing arm 42 and the crossbar 43 are metal rods, both of which are formed by bending.

[0062] The rotating rod 41 is equipped with an elastic element that drives the swing rod 42 to press against the model 102 in the fixture 3. The elastic element is a torsion spring 44, which is sleeved on the rotating rod 41. A support rod 45 is fixed to the outer wall of the rotating rod 41. One end of the torsion spring 44 is fixed to the horizontal transfer table 2, and the other end of the torsion spring 44 abuts against the support rod 45.

[0063] The torsion spring 44 provides a continuous driving force to the rotating rod 41, which causes the rotating rod 41 to have a tendency to rotate toward the fixture 3. The purpose is to ensure that the crossbar 43 and the model 102 can fit tightly together when the rotating rod 41 is performing scanning detection.

[0064] After the edge scanning of model 102 is completed, the swing rod 42 should be separated from model 102. At this time, the swing rod 42 needs to be lifted. The specific structure is as follows:

[0065] Reference Figures 3-5 A lifting arm 5 is rotatably connected to the outer wall of the horizontal transfer table 2. The lifting arm 5 has a Z-shaped structure. One end of the lifting arm 5 is rotatably connected to the horizontal transfer table 2, and a damping ring 51 is fitted on this end of the lifting arm 5. The damping ring 51 is a rubber ring. The damping effect of the damping ring 51 can overcome the weight of the lifting arm 5 itself and the elastic force of the torsion spring 44, so that the lifting arm 5 can remain stopped at the rotating stop position.

[0066] When the swing arm 42 is performing angle scanning detection on the model 102, the lifting arm 5 is located below the swing arm 42;

[0067] After the swing arm 42 finishes performing angle scanning detection on the model 102, the lifting arm 5 rotates upward, and the horizontal bar 43 comes into contact with the upper part of the lifting arm 5. Therefore, the horizontal bar 43 and the swing arm 42 are lifted upward away from the model 102 by the lifting arm 5.

[0068] A magnetic block 52 is fixed on the side of the lifting arm 5 that is used to contact the swing rod 42. The magnetic block 52 is a disc-shaped magnet. When the lifting arm 5 lifts the swing rod 42, the swing rod 42 and the magnetic block 52 are magnetically attracted to each other and fixed.

[0069] Working principle: The angle detection of the edge of the model 102 by the swing rod 42 completes the scanning and positioning of the edge of the lens 101, so that the control system can accurately perform side thinning of the lens 101.

[0070] Example 2, a positioning component for grinding the edge of a lens, referring to... Figure 7The frame 1 is equipped with an air pump 7, which includes a housing fixed to the frame 1 and blades mounted on a rotating shaft. The blades rotate within the housing to generate airflow for suction. The housing of the air pump 7 is fixed to the frame 1, and the power shaft of the air pump 7 is the rotating shaft of the grinding stone. A vertical baffle 73 is fixed to the frame 1, separating the grinding stone and the air pump 7, so that the air pump 7, its inlet pipe 72, and its outlet pipe 71 are all located on the opposite side of the grinding stone.

[0071] The air inlet pipe 72 of the air pump 7 is located at the edge of the frame 1, and an air filter is installed on the air inlet pipe 72 of the air pump 7 to reduce dust entering the air inlet pipe 72.

[0072] The air outlet pipe 71 of the air pump 7 faces the edge of the model 102 in the fixture 3, and the air outlet pipe 71 is set downward. The air outlet pipe 71 and the swing rod 42 are located on both sides of the model 102.

[0073] 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 principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A positioning assembly for grinding the edge of a lens, comprising a frame (1), wherein a horizontal transfer stage (2) is slidably mounted on the frame (1), the horizontal transfer stage (2) comprising a chuck (21) for clamping spectacle lenses (101) and a clamp (3) for clamping a model (102), characterized in that: The horizontal transfer stage (2) is equipped with an angle sensor (4) for detecting vertical plane rotation. The angle sensor (4) includes a rotating rod (41). The rotating rod (41) is fixed with a swing rod (42) that rotates downward under gravity. One end of the swing rod (42) abuts against the upper end of the model (102) in the fixture (3). The rotating rod (41) is equipped with an elastic element that drives the swing rod (42) to press against the model (102) in the clamp (3); The outer wall of the horizontal transfer table (2) is rotatably connected to a lifting arm (5). The lifting arm (5) is equipped with a damping ring (51) to achieve positioning at the stop position. The lifting arm (5) is located below the swing rod (42). When the lifting arm (5) rotates upward, the lifting arm (5) lifts the swing rod (42) to separate the swing rod (42) from the model (102) in the fixture (3); The side of the lifting arm (5) that is used to contact the swing rod (42) is fixed with a magnetic block (52) for magnetically attracting the swing rod (42).

2. The positioning component for grinding the edge of a lens according to claim 1, characterized in that: A horizontal bar (43) is fixed to one end of the swing rod (42) that abuts against the model (102). The length of the horizontal bar (43) is at least 3 times the thickness of the model (102). The length direction of the horizontal bar (43) is consistent with the thickness direction of the model (102). The horizontal bar (43) abuts against the upper end of the model (102).

3. The positioning component for grinding the edge of a lens according to claim 1, characterized in that: The elastic element is a torsion spring (44), which is sleeved on the rotating rod (41). A support rod (45) is fixed on the outer wall of the rotating rod (41). One end of the torsion spring (44) is fixed to the horizontal transfer table (2), and the other end of the torsion spring (44) abuts against the support rod (45).

4. The positioning component for grinding the edge of a lens according to claim 1, characterized in that: The fixture (3) includes a plug (31) for inserting the model (102) and two sockets (32).

5. The positioning component for grinding the edge of a lens according to claim 1, characterized in that: The frame (1) is equipped with a rotating shaft, on which a grinding stone (61) and a V-shaped grinding stone (62) are fixed. The horizontal transfer table (2) is equipped with a lifting sensor (63) for the lower end of the model (102) in the fixture (3) to abut against the lifting mechanism.

6. The positioning component for grinding the edge of a lens according to claim 5, characterized in that: The horizontal transfer table (2) is equipped with an air pump (7), which includes a housing fixed to the frame (1) and blades mounted on the rotating shaft; The air outlet pipe (71) of the air pump (7) faces the edge of the model (102) in the fixture (3), and the air outlet pipe (71) is set downward. The air outlet pipe (71) and the swing rod (42) are located on both sides of the model (102).

7. The positioning component for grinding the edge of a lens according to claim 6, characterized in that: The frame (1) is fixed with a baffle (73), the grinding stone (61) and the V-shaped grinding stone (62) are located on one side of the baffle (73), and the air inlet pipe (72) of the air pump (7) is located on the other side of the baffle (73).

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