KR100447703B1 - clamping device used in manufacturing glass lens - Google Patents

Abstract

In the clamping device for the spectacle lens processing machine comprising a first fixing member comprising a first spindle for fixing only one surface of the blank lens to be processed, but having only a rotational movement, and a second fixing member for fixing the other surface of the blank lens. In order to accurately and firmly fix the blank lens in the polishing process and to manufacture the lens at a low price, a second spindle and one end of which the second fixing member is positioned on the same axis as the first spindle are fastened to the second spindle, Disclosed is a technique comprising a cylindrical clamping body having a slot formed therein and a plate connected to the other end of the clamping body via screws.

Description

Clamping device used in manufacturing glass lens

The present invention relates to a clamping apparatus of an spectacle lens processing machine, and more particularly to a clamping apparatus of an spectacle lens processing machine which can be manufactured economically while accurately and firmly clamping a blank lens of a spectacle lens to be processed.

Glasses are optical devices that enable people with low vision to have the same vision as normal people, and include eyeglass frames and lenses. These glasses are mainly used for vision correction or vision security, and a variety of eyeglass frames are manufactured to fit each face shape or taste of a consumer, and thus, lenses that are originally manufactured and sold in a round shape (hereinafter, referred to as blank lenses (lens) blanks) should be processed according to the consumer's preference, such as grinding and polishing the appearance of the blank lens to fit the selected eyeglass frame.

In the early days of lens processing technology, eyeglass frame shapes were drawn on paper so that the outside of the eyeglass frame appeared, and then attached to a blank lens. Then, the blank lens was polished by hand while checking the outer line of the frame of the spectacle using a whetstone polisher. This more advanced lens processing technique uses a lens processing machine (hereinafter referred to as a pattern lens processing machine) that manufactures a model made of plastic so that the outline of the spectacle frame appears and employs it. The blank lens is processed by automatically pushing the blank lens in both directions to secure it to the clamping device and bringing the spindle of the clamping device into contact with polishers disposed at the bottom, front and rear of the blank lens while rotating at the same speed. At this time, since the contact limit between the blank lens and the polishing machine is determined by the pattern, the spectacle lens having the same shape as that of the pattern is formed.

Other lens processing techniques include a tracer that reads the shape of the spectacle frame without the pattern described above, and a blocker that grasps the optical center of the blank lens and makes it easier to fit the blank lens onto the fixed shaft of the lens machine. The blank lens is processed using a processing system (hereinafter referred to as a patternless lens processing machine). Under server control of the processing system, the data on the spectacle frame shape obtained from the tracer allow the grinder to recognize the pattern as if it is present and to align the axis of the clamping device's spindle with the mechanical optical axis of the lens to be finally completed and fitted to the spectacle frame Secure the blank lens to the clamping device. Then, the polishing work is carried out.

In order to precisely process the blank lens using the pattern lens machine or the patternless lens machine described above, both sides of the blank lens must be firmly fixed to the clamping device including two spindles located on the same axis. If the blank lens is not firmly clamped, when the blank lens is rotated for processing, the blank lens moves independently of the spindle of the clamping device, so that the mechanical optical axis of the lens to be finally finished and fitted on the frame is normal. The blank lens is machined away from. Therefore, when using this misaligned lens as an astigmatism correcting lens, the object seen through the lens is bent.

With reference to FIGS. 1 and 2, the clamping device used in the lens processing machine or the patternless processing machine according to the prior art and its problems will be described in detail.

The clamping device for contacting the convex surface 23 and the concave surface 24 of the blank lens 10 to be processed to fix the blank lens 10 during polishing has a first spindle (aligned on the same axis A). 11) and the second spindle 12, the clamping block 13 and the clamping block 13 fixed to the first spindle 11 on the same axis is attached to the convex surface 23 of the blank lens 10 The blocking pad 14 is included. The first spindle 11 is not possible to move left and right, only rotational movement, and the second spindle 12 is capable of left and right movement and rotational movement. In addition, the clamping device is holed inside so that the protrusion 16 of the second spindle 12 is fitted, and the clamping body 15 and the second connected to the second spindle 12 by the fixing screw 22. A plate 19 in contact with the concave surface 24 of the blank lens 10 by the lateral movement of the spindle 12 and a bellows 17 connecting the clamping body 15 and the plate 19. During the processing of the blank lens 10, the concave surface 24 of the blank lens 10 is not damaged while generating friction force between the blank lens 10 and the plate 19 so that the axis of the blank lens does not rotate undesirably. In order to protect it, at least one ring 20 of semi-elastic material is provided on the plate 19. And the tip 18 of the clamping body 15 is similar to the hexagonal shape, a hole having a shape corresponding to the tip 18 is formed in the central portion of the plate 19. The tip 18 is installed to maintain a constant interval without being tightly fitted into the hole, and the plate 19 moves up, down, left and right according to the left and right and the rotational movement of the axis A of the second spindle 12. It is possible.

Referring to the clamping process, first, as shown in FIG. 1, the convex surface 23 of the blocking lens 10 is positioned on the blocking pad 14, and the blank lens is disposed on the axis A of the first spindle 11. To match the optical center of the user who will use the processed lens or the center of the finished lens after processing other than the center of (10). At this time, the plate 19 connected to the clamping body 15 fixed to the second spindle 12 is substantially perpendicular to the second spindle 12.

Next, as shown in FIG. 2, the second spindle 12 is pushed on the same axis as the first spindle 11. When the second spindle 12 is moved toward the concave surface 24 of the blank lens 10, the upper portion of the blank lens 10 has a larger radius of curvature than the lower portion thereof, so that the ring 20 installed below the plate 19 is provided. The concave surface 24 of the blank lens 10 is brought into contact before the ring 20 provided thereon. The force exerted on the ring 20 at the concave surface 24 of the blank lens 10 contracts the lower bellows 17 and moves the plate 19 to tilt at an angle in the vertical direction of the axis A, A ring 20 installed on top of the plate 19 contacts the top of the concave surface 24 of the blank lens 10 and the upper bellows 17 is relaxed. If it is confirmed by the sensor (not shown) that the ring 20 installed on the plate 19 is in contact with the concave surface 24 of the blank lens 10, the operation of clamping the blank lens 10 is complete and the second The left and right movement of the spindle 12 is stopped. Thereafter, the first spindle 11 and the second spindle 12 are rotated about the same axis (A) and the blank lens 10 is processed using a polishing machine.

However, in the clamping device according to the related art, the tip 18 of the clamping body 15 must be manufactured in a hexagonal shape for the clamping operation, so that the manufacturing of the clamping body 15 is not easy. In addition, since the tolerance of each other must be allowed when manufacturing the plate 18 having the tip 18 and the hole of the clamping body 15, the first spindle 11 and the first When the two spindles 12 rotate, relative rotation between the plate 19 and the tip 18 of the clamping body 15 may occur. In addition, since the plate 19 and the body 15 are inherently not in close contact and are separated by a predetermined distance, relative rotation between the plate 19 and the tip 18 of the clamping body 15 may also occur. In addition, the tip 18 or plate 19 of the clamping body 15 may be damaged. In addition, in the blocking lens, the blank lens 10 may be damaged or not accurately and firmly fixed during the polishing process, such as an axis that is actually processed from an axis to be originally processed.

In addition, in consideration of productivity, the body 15 is manufactured by adopting a forging method using an expensive manufacturing machine, so that the production cost is bound to increase. In addition, since the plate 19 is formed with a hole corresponding to the tip 18 so that the plate 19 rotates as the second spindle 12 and the clamping body 15 move, the hole also has a hexagonal shape. do. Therefore, the plate 19 is manufactured by the electric discharge machining method which requires an expensive metal mold | die. In summary, the production cost is too high to manufacture the clamping device according to the prior art.

Accordingly, it is an object of the present invention to provide a clamping device which can accurately and firmly fix a blank lens without damage in a polishing process.

Another object of the present invention is to provide a clamping device for a spectacle lens processing machine that can be manufactured at a low price.

1 and 2 are views showing the operating state of the clamping device of the spectacle lens processing machine according to the prior art.

3 and 4 are views showing an operating state of the clamping device of the spectacle lens processing machine according to the present invention.

In order to achieve the object of the present invention, the clamping device according to an embodiment of the present invention, the first fixing member and the blank lens of the first lens including a first spindle that is fixed only one side of the blank lens to be processed, the rotational movement only And a second fixing member for fixing the other surface, wherein the second fixing member has a second spindle and one end fastened to the second spindle, the second spindle being positioned on the same axis as the first spindle, and having a plurality of slots formed on the surface thereof. And a clamping body. Therefore, during clamping for the processing of the blank lens, the other surface of the blank lens is brought into contact / fixing with the other end of the clamping body.

The clamping body can be embodied in a cylindrical shape, and the slot can be formed over the entire or part of the cylindrical surface. In addition, the clamping device for the spectacle lens processing machine according to an embodiment of the present invention may further include a plate connected to the other end of the clamping body through a fixing means such as a screw. In addition to this, the clamping device may further comprise a bellows, which is connected to a second spindle, one end of which is connected to a part of the clamping body or one end of the clamping body, the other end of which is connected to another part or plate of the clamping body. do. And since the bellows is disposed to cover the upper portion of the slot of the clamping body, one or more bellows may be installed to correspond to the number of slots formed.

Hereinafter, an example of a clamping device for processing a spectacle lens according to the present invention will be described in detail with reference to FIGS. 3 and 4.

The clamping device contacts the convex surface 43 of the blank lens 30 to fix the block surface 43 and the concave surface 44 of the blank lens 30 to contact the concave surface 44. And a second fixing member for fixing. As described with reference to FIGS. 1 and 2, the first fixing member may include a first spindle 31, a clamping block 33 and a clamping block, which are fixedly connected to the first spindle 31, which may not rotate left and right, and which are rotatable. 33) a blocking pad 34 attached to the top surface and in contact with the convex surface 33 of the blank lens 30. Since the blocking pad 34 is in contact with the convex surface 43 of the blank lens 30, it is preferable that the blocking pad 34 is made of a round tape made of adhesive tape to the soft rubber component to prevent damage of the blank lens 30. The second fixing member includes a clamping body 35 having one end fixedly connected to the second spindle 32 by a second screw 32 and a fixing screw 38a capable of horizontal movement and rotation. The clamping body 35 has a plurality of slots 36 formed on its surface in whole or in part, and has a hole inside thereof as in the clamping body 15 of FIGS. The protrusion is inserted and fixed. More preferably, the clamping body 35 may be formed in a cylindrical shape. In addition, the clamping body 35 may be laterally moved along the axis A or may be flexibly moved up or down the axis A according to the direction, size and shape of the slot. Particularly with regard to the material constituting the clamping body 35, the clamping body is machined in a simple lathe operation, while adjusting the length and width of the slot 36 properly so that the clamping body 35 does not twist in the direction of the axis A. do. In other words, once the top of the cylindrical coupler along the circumference, once the top and bottom and once again in the form of the left and right around the axis of the fluidity is not twisted by the rigidity of the metal inside the coupler.

Therefore, the clamping body 35 has elasticity by itself by the slot 36 provided therein. In addition, while the conventional clamping device generates a lot of manufacturing costs, the clamping device of the present invention can be manufactured by a simple lathe work, there is an advantage that can reduce the manufacturing cost.

That is, as shown in FIG. 3, the convex surface 33 of the blank lens 30 is fixed by the blocking pad 34 of the first fixing member. And, in a state where the concave surface 34 of the blank lens 30 is not fixed by the second fixing member including the second spindle 32, the slot 36 is substantially perpendicular to the second spindle 32. In the in state and the interval between the upper slot 36 and the lower slot 36 are all equally spaced.

In order to fix the concave surface 44 of the blank lens 30 here, the second spindle 32 is moved along the axis A to the left. Then, the lower part of the clamping body 35 reaches the concave surface 34 of the blank lens 30 before the upper part, so that the interval of the slot 36 of the lower part becomes narrow, and the upper part of the slot 36 The spacing is widened such that the clamping body 35 comes into contact with the concave surface 34 of the blank lens 30. That is, the slot 36 of the clamping body 35 varies in accordance with the curvature state of the concave surface 44 of the blank lens 30 with which the clamping body 35 is in contact, and accordingly the clamping body 35 is shafted. Along with (A) it is in close contact with the blank lens 30 in the vertical direction around the axis (A). Since the blank body 35 comes into contact with the concave surface 44 of the lens 30, the blank body or at least the surface of the blank body which contacts the concave surface 44 may be caused by the movement of the clamping body 35. It is made of a material capable of generating a friction force between the blank lens 30 and the clamping body 35 while preventing damage to the surface of the lens 30.

That is, in the clamping device of the prior art, in order to fix the concave surface 24 of the blank lens 10, the clamping body 15 and the tip 18 having the second spindle 12, the hexagonal tip 18, and the tip 18 are fixed. Both the plate 19 and the bellows 17 connecting the clamping body 15 and the plate 19 in which corresponding holes were formed were required. However, in the present invention, since the clamping body 35 itself is formed by the slot 36 to have elasticity, the concave surface 44 of the blank lens 30 is formed only by the clamping body 35 having the slot 36. Can be fixed Therefore, it is not necessary to manufacture the clamping body 15 having the hexagonal tip 18 and the plate 19 in which the holes corresponding to the tip 18 are formed, thereby simplifying the manufacturing process of the clamping device. In addition, during the rotation for the machining of the lens 30, the axis to be processed due to manufacturing tolerances of the tip 18 and the clamping body 15 as shown in Figs. The possibility of misalignment does not occur fundamentally.

Meanwhile, the second fixing member further includes a plate 39 connected to the other end of the clamping body 35 by a fixing screw 38b, and the blank lens 30 is disposed on a predetermined portion of the surface of the plate 39. It may further comprise a ring 40 protruding toward the concave surface 44 of the.

As described above, even without the plate 39, the concave surface 44 of the blank lens 30 can be fixed. However, the material has a slight elasticity and can generate frictional force with the blank lens 30, for example, cork or the like. When the plate 39 is mounted, the plate 39 is slightly inclined in the vertical state with the second spindle 32 according to the contraction and relaxation of the slot 36 of the clamping body 35, and the front of the plate 39. Contact is made along the concave surface 44 of this lens 30. Here, the plate 39 is connected to the clamping body 35 directly through the screw 38b without being disposed at a predetermined distance from the clamping body 35, unlike in the prior art, so that the lens 30 is more firmly connected. Will be clamped. At this time, since the clamping body 35 does not directly contact the concave surface 44 of the blank lens 30, the clamping body 35 may be made of a material which can be elastically itself by the slot 36.

In addition, when the ring 40 is made of a semi-elastic material, such as the ring (20 of FIGS. 1 and 2) used in the clamping device according to the prior art, the blank lens 30 can be more firmly fixed. However, in the present invention, since the clamping operation of the blank lens 30 is realized by the clamping body 35 having its own elasticity as described above, unlike the conventional ring 20, it does not have to be composed of a semi-elastic body. Therefore, there is an advantage that the manufacturing cost of the clamping device can be lowered.

The second fixing member may further include a bellows 37, one end of which is connected to the plate 39 and the other end of which is connected to the second spindle 32. The bellows 37 also contracts and relaxes as the clamping body 35 and plate 39 move in close contact with the concave surface 44 of the blank lens 30. This bellows 37 is such that the plastic or glass pieces generated during the processing of the blank lens 30 enters the slot 36 of the clamping body 35 so that the clamping body 35 elastically contracts and relaxes according to the curvature of the lens. This is to prevent you from doing so. Accordingly, one or more bellows 37 may be installed to cover the portion where the slot 36 is formed.

3 and 4 show that the bellows 37 is connected to the plate 39 and the second spindle 32, but the bellows 37 of the clamping block 35 covers the upper portion of the slot 36 formed therein. Obviously, it may be connected to both sides.

According to the above description, in the clamping apparatus according to the related art, in addition to the clamping body 15, the plate 19 and the bellows 17 are required to clamp the other surface of the blank lens 35. Since the clamping body 35 directly clamps the other side of the blank lens 35, unlike the clamping device according to the prior art, the blank lens 30 may not be considered at all because the clamping body 35 does not have to consider the occurrence of tolerances between the clamping body, the plate, and the bellows. It can be fixed more firmly and accurately. In addition, since the plate 39 and the clamping body 35 are not spaced apart, the clamping body 35 and the plate 39 are directly fastened through the screws 38b, so that the combination thereof is more firm, even when polishing. The blank lens 30 can be fixed accurately and firmly.

In order to manufacture a clamping device according to the prior art, a clamping body 15 having a hexagonal tip 18, a plate 19 having a hole corresponding to the tip 18, and a clamping body 15 and a plate ( It is essential to manufacture the bellows (17) connecting the 19). In particular, the manufacturing costs of the clamping body 15 and the plate 19 were high and the manufacturing was not easy. However, in order to manufacture the clamping device according to the invention with minimal components for the clamping operation, only the manufacture of the clamping body 35 with the slot 36 is required, thus producing the clamping device according to the invention. Is relatively easy and can lower production costs.

In the clamping device of the present invention, holes are not formed in the plate 39 added to reinforce the clamping operation, and the manufacture of the plate 39 is also easy.

Claims (5)

A first fixing member comprising a first spindle for fixing one surface of the blank lens to be processed, wherein only the first spindle can rotate; A second fixing member for fixing the other surface of the blank lens, The second fixing member includes a second spindle positioned on the same axis as the first spindle and a clamping body having one end fastened to the second spindle and having a plurality of slots formed on a surface thereof. When clamping for processing the blank lens, the other surface of the blank lens is in contact with the other end of the clamping body, the clamping device for a spectacle lens processing machine. The clamping device of claim 1, wherein the clamping body is cylindrical and the slot is partially formed in the cylindrical surface. The clamping device for spectacle lens processing machine according to claim 1, further comprising a plate connected to the other end of the clamping body by fixing means. 4. The apparatus of claim 3, further comprising one or more bellows disposed to cover a slot top of the clamping body, wherein one end of the one or more bellows ends is connected to the second spindle connected to one end of the clamping body and the other end is Clamping device for spectacle lens processing machine, characterized in that connected to the plate. 5. The clamping device as claimed in claim 4, further comprising at least one ring attached to said plate and protruding toward said first spindle and formed of a semi-elastic material.