JP2518498Y2 - Lens press machine for lens bonding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a lens press device of a lens bonding machine for making a thin and uniform adhesive between lenses when bonding a plurality of divided lenses. Regarding

[Conventional technology]

In a spectacle lens, in particular, a progressive multifocal spectacle lens made of plastic, generally, the second surface is formed thicker than the first surface which gives a progressive diopter and stocked, and each time according to the user's order A manufacturing method is employed in which each second surface is cut and polished into a predetermined shape to give a dioptric power and astigmatism, various coatings are applied, and then the second surface is rubbed and framed.

Therefore, it takes about one week after the specifications required by the user are determined until the progressive multifocal spectacle lens is completed.
Moreover, it was expensive because of the yield during the manufacturing process.

However, recently, a plastic progressive multifocal spectacle lens is divided into a front lens that gives progressive power and a back lens that gives diopter and astigmatism, molded, and then stocked after various coatings. By selecting a predetermined front lens and back lens according to the specifications to be adhered to each other with a photo-curing adhesive, and then scoring and framing, a short time of about 1 hour and low cost The method of manufacturing progressive multifocal spectacle lenses has begun to be adopted.

The spectacle lens bonding machine used for bonding the front lens and the back lens described above is provided with a lens press device for applying pressure to the lens in order to thinly and uniformly spread the adhesive between the two lenses. There is. FIG. 4 shows an example of a conventional lens press device of this type.

In FIG. 4, an air cylinder 2 is attached to the lower surface of the cylinder mounting plate 1, and a bracket 3 is provided on the upper surface of the cylinder mounting plate 1. A mounting base 5 is concentrically fixed to the piston 4 of the air cylinder 2, and a lower press rubber holder 6 is mounted on the mounting base 5. The lower press rubber holder 6 is bonded with a lower press rubber 7 which is made of a flexible rubber and formed into a substantially columnar shape.

On the other hand, an upper press rubber holder 8 is attached to the upper portion of the bracket 3, and an upper press rubber 9 formed of a flexible rubber in a substantially hemispherical shape is adhered to the lower surface of the upper press rubber holder 8. Then, the back lens 11 and the front lens 12 combined by applying the uncured adhesive 10 in the middle are placed on the lower press rubber 7, and the lower press rubber holder 6 is lifted by the air cylinder 2 to move the upper press rubber. Lens 11,12 between 9 and lower press rubber 7
Is sandwiched and pressure is applied to thinly and evenly spread the adhesive 10.

[Problems to be solved by the device]

However, according to the conventional lens pressing device described above, the two lenses 11 and 12 are laterally displaced due to the imbalance of the pressure following the deformation of the rubbers 7 and 9 caused by the application of the pressure, and the combination of the lenses is performed. There was a problem that the state would change. In order to correct this lateral displacement, apply force to the lateral direction of the lens with your finger and use the two lenses 11,1
There was also a problem that when one of the two was moved relative to each other, bubbles were introduced from the displaced part and the adhesive strength was reduced.

The present invention has been made in view of the above points, and when pressure is applied to a plurality of lenses to spread the adhesive, it is possible to prevent lateral displacement between the lenses and improve workability of mounting. It is an object of the present invention to provide a lens press device for a lens bonding machine that can perform the above.

[Means for solving the problem]

The lens pressing device for a lens bonding machine according to the present invention is the lens pressing device for a lens bonding machine, wherein a plurality of lenses combined through an adhesive are sandwiched between a pair of elastic members and pressed. A pair of support means for respectively supporting any one of the members and for approaching and separating each elastic member in a state of facing each other;
An annular member is provided between the elastic members so as to be movable relative to the supporting means and holds the outer circumferences of the plurality of lenses in a radial direction immovably. .

〔Example〕

An embodiment of a lens pressing device of an eyeglass lens bonding machine of the present invention will be described below with reference to the drawings.

1 to 3 show an embodiment of the present invention. FIG. 3 is a perspective view showing an example of an eyeglass lens bonding machine equipped with the lens pressing device of the present invention. An air cleaning unit 22 is fixed to the upper surface of the main body rack 21, and dust and dust are removed by the air cleaning unit 22 to blow clean air downward. Flexible tube from the top of the main unit rack 21
An air gun 24 is hung down via 23, and the air gun 24 is used to remove dust and the like adhering to the lens to be adhered. An adhesive table 25, a lens press device 26, a light irradiation device 27, a control device 28, an adhesive discharge part 29 and the like are provided in the middle of the main body rack 21.

FIG. 1 is a partial cross-sectional view showing the structure of the lens pressing device 26 according to this embodiment. In FIG. 1, parts corresponding to those of the conventional example shown in FIG.
The description will be omitted as appropriate. Piston lift air inlet 2a
Further, the air cylinder 2 having the piston lowering air intake port 2b is attached to the cylinder mounting plate 1 with screws 31, and the cylinder mounting plate 1 is fixed to the lower end surface of the lower portion 3a of the bracket 3 with screws 32. An annular mount 5 is fixed to the piston 4 of the air cylinder 2 with a screw 33, and a lower press rubber holder 6 as a lower support means is fixed to the mount 5 with a set screw 34. A lower press rubber 7 which is a lower elastic member is concentrically adhered onto the lower press rubber holder 6, and a cylindrical slide guide 35 is screwed to the outer periphery of the lower press rubber holder 6. And the mount 5, the lower press rubber holder 6,
The lower press rubber 7 and the slide guide 35 are attached to the piston 4
And go up and down together.

A plurality of stepped holes 35a are concentrically formed on the peripheral wall of the slide guide 35 at equal intervals, and stepped pins 36 are slidably inserted in the stepped holes 35a, respectively. Further, the stepped pin 36 is biased upward by a coil spring 37 as a spring member mounted in the stepped hole 35a. The stepped pin 36 is prevented from coming off the stepped hole 35a by the stepped portion, and when a downward force is applied to the stepped pin 36, the coil spring is
The 37 is compressed and moves downward, returning to its original state when the load is removed.

On the outer periphery of the slide guide 35, a substantially cylindrical annular member
The inner periphery of 38 is fitted so as to be slidable in the axial direction (vertical direction in the drawing), and the rib 38a is provided on the inner periphery of the intermediate portion of the annular member 38 in the axial direction.
Is provided so as to project. The upper end of the stepped pin 36 is in contact with the rib 38a. Further, a circular concave portion 38b for fitting and positioning the bonding table 25 is formed on the upper surface of the annular member 38. Therefore, when a load is applied from above, the annular member 38 compresses the coil spring 37 via the stepped pin 36 and can move downward. Further, the annular member 38 moves in conjunction with the operation of the piston 4 when no load is applied.

On the other hand, an upper press rubber holder 8 as an upper support member is fixed to the upper portion 3b of the bracket 3 with a set screw 39, and an upper press rubber 9 as an upper elastic member is attached to the lower surface of the upper press rubber holder 8. It is glued concentrically.

FIG. 2 is a plan view showing the bonding table 25. On the outer periphery of the bonding table 25, the progressive power of the front lens 12 and the back lens 11
An angle scale 25a for setting the astigmatic power of is engraved.
Further, four holding claws 25b are concentrically provided on the surface of the bonding table 25 so as to project at equal intervals in the circumferential direction.
The inner diameter of the lens holds the outer diameter of the lenses 11 and 12, and the inner stepped portion holds the lower surface of the outer circumference of the lenses 11 and 12.

Next, the operation of this embodiment will be described. Holding claw 25 for bonding table 25
The front lens 12 is fitted to b with the convex surface facing downward, and an appropriate amount of adhesive is discharged onto the upper surface of the lens 12 by the adhesive discharge section 29. The back lens 11 is placed thereon, and the progressive dioptric power axis and the astigmatic dioptric power axis are adjusted to an arbitrary angle using the angle scale 25a of the bonding table 25 and combined. Then, the bonding table 25 on which the lenses 11 and 12 thus combined are placed is fitted and placed in the recess 38b on the annular member 38 of the lens pressing device 26 as it is.

Next, when air is supplied to the air inlet 2a for raising the piston at an arbitrary pressure and the air inlet 2b for lowering the piston is opened, the piston 4 of the air cylinder 2 starts to rise and is fixed to the piston 4. The table 5, the lower press rubber holder 6, the lower press rubber 7, and the slide guide 35 are integrally lifted. As a result, the coil spring 37 supported by the lower press rubber holder 6 and the stepped pin 36 are pressed to raise the annular member 38 integrally. Therefore, the lenses 11 and 12 ascend together with the bonding table 25 placed on the annular member 38.

When the lenses 11 and 12 rise by an arbitrary amount, the back lens 11 comes into contact with the upper press rubber 9, so that the rise of the back lens 11, the front lens 12, the bonding table 25, and the annular member 38 is suppressed. Then, the lower press rubber 7, the lower press rubber holder 6, the slide guide 35, and the mounting base 5 further move up while compressing the coil spring 37. Next, the front lens 12 contacts the lower press rubber 7, and the lower press rubber 7 deforms together with the upper press rubber 9. Then, when the amount of deformation corresponding to the force obtained by multiplying the air supply air pressure by the cross-sectional area of the air cylinder 2 is reached, the deformation of the rubbers 7 and 9 stops, and the prescribed pressure is applied to both surfaces of the lenses 11 and 12 to bond them. The agent 10 is spread thinly and uniformly. At this time, the outer edges of the lenses 11 and 12 are held by the holding claws 25b.
The lenses 11 and 12 are not laterally displaced because they are regulated.

Next, air is supplied to the piston lowering air suction port 2b, and the piston rising air suction port 2a is opened, so that the piston 4 descends and the space between the upper press rubber 9 and the lower press rubber 7 is opened. The bonding table 25 can be taken out. Then, the lenses 11 and 12 together with the bonding table 25 are used as the light irradiation device 2
The adhesive 10 is mounted on 7, and the process moves to the step of curing the adhesive 10 by irradiating with light.

According to the present embodiment, the lenses 11 and 12 are placed on the bonding table 25, and pressure is applied while the outer peripheries of the lenses 11 and 12 are positioned and held by the holding claws 25b, so that the lateral displacement between the lenses 11 and 12 is prevented. Therefore, the yield can be improved.

Further, since the bonding table 25 is positioned in the direction of the normal line of the shaft by the concave portion 38b of the annular member, it is possible to prevent the pressure from deviating to each surface of the lenses 11 and 12.

Furthermore, as a part to hold the lens outer diameter, adhesive 10
Since it has a structure that the adhesive base 25 that is used when curing the and when adjusting the progressive power axis and the astigmatic power axis to an arbitrary angle can be used as it is, there is no need to remove the lenses 11 and 12 from the adhesive base 25. Time can be shortened. Moreover, since the number of times the lenses 11 and 12 are touched by the hands is reduced, the probability of damaging or contaminating the lenses 11 and 12 is reduced.

[Effect of device]

As described above, according to the lens pressing device of the lens bonding machine of the present invention, the outer circumference is always held when pressure is applied to the lens in order to spread the adhesive thinly and uniformly when mounting a plurality of lenses. By doing so, it is possible to prevent the lateral displacement of the plurality of lenses and improve the yield.

[Brief description of drawings]

FIG. 1 is a partial sectional front view showing the construction of an embodiment of a lens pressing device for a lens bonding machine of the present invention, FIG. 2 is a plan view showing the construction of the same bonding base, and FIG. 3 is a lens according to this embodiment. FIG. 4 is a perspective view showing a configuration of an example of a lens bonding machine provided with a pressing device, and FIG. 4 is a partial sectional front view showing a configuration of an example of a conventional lens pressing device. 2 ... Air cylinder, 3 ... Bracket, 6 ... Lower press rubber holder (lower support means), 7 ... Lower press rubber (lower elastic member), 8 ... Upper press rubber holder (upper support means), 9 ...... Upper press rubber (upper elastic member), 10 …… Adhesive, 11,12 …… Lens, 26 …… Lens press device, 37 …… Coil spring (spring member), 38 …… Annular member.

Claims (1)

(57) [Scope of utility model registration request] 1. A lens pressing device of a lens bonding machine, which sandwiches and presses a plurality of lenses combined with an adhesive agent between a pair of elastic members, wherein any one of the pair of elastic members is provided. A pair of support means for supporting each one and for approaching and separating each elastic member in a state of facing each other, and provided between the elastic members so as to be movable relative to each supporting means. And a ring member that holds the outer peripheries of the plurality of lenses immovably in the radial direction, the lens pressing device of the lens bonding machine.