JPH0364455B2 - - Google Patents

Description

Detailed Description of the Invention (Technical Field) The present invention relates to a conveying device for a press optical material and a press lens in a glass press lens molding device using a lower die push-up method. The present invention relates to a conveyance device that conveys a molded press lens from a press molding device.

(Prior art) The present applicant had previously proposed a conveying device for producing glass press lenses by press-working optical materials whose weight has been regulated in advance (Japanese Patent Application Laid-Open No. 1989-1999).
203732), there is a conveying device for press optical materials and press lenses disclosed in “Optical Element Molding Method and Apparatus”.

FIG. 9 and FIG. 10 are a perspective view and a cross-sectional view of essential parts of the conveying device for the optical material for press and the press lens.

In this apparatus, a heating furnace 1 for heating an optical material 17 until it reaches a predetermined viscosity is formed in a tunnel shape, and inside thereof there are two rail-shaped conveyors 2 for transporting the optical material 17 toward a press molding section.
is provided. Optical material 1 in heating furnace 1
The temperature near the opening on the transfer end side of 7 is set so as to heat the optical material to a temperature higher than the softening point of the optical material, thereby softening the optical material.

The optical material 17 softened as described above is placed on the mounting table 3, passes through the heating furnace 1, and is transferred toward the press molding section. Two holes 3a and 3b are formed in the center of the mounting table 3. Hole 3a,
3b, the hole 3a on the upper side is formed with a larger diameter,
Moreover, the diameter is set to be smaller than the outer diameter dimension of the optical material 17. An optical material stage 4 is fitted into the two-stage holes 3a and 3b from above.
This optical material stage 4 is configured to be freely movable up and down via a protruding rod 5 that is disposed so as to be movable up and down.
During this upward movement, the optical material stage 4 and the protruding rod 5 are fixedly connected.

On the side of the protruding rod 5, an upper mold guide member 6a,
An upper mold and a lower mold 8 are arranged to be slidable within the lower mold guide member 6b, and the upper and lower molds 7 and 8 constitute a press molding section.

A gap is provided between the upper die guide member 6a and the lower die guide member 6b, and the optical material holding members 9, 9 are movable in the gap in a direction perpendicular to the conveying direction of the conveyor 2. It is interposed.

The optical material holding members 9 , 9 clamp and fix the optical material 17 that has been moved upward via the protruding rod 5 at the upward movement position, and carry it between the upper mold 7 and the lower mold 8 . The optical material 17 carried in is placed in the upper and lower molds 7 and 8.
The material is press-formed and then held again via the holding members 9, 9, placed on the mounting table 3 of the conveyor 2, and transferred into the lehr 10 where it is annealed to room temperature.

The above is an overview of the conventional conveyance device.

However, with such conventional conveying devices, press lenses are simply placed on the flat plate of the mounting table after being molded and released, so they may be conveyed in an unstable state and fall, or they may not be precisely Since the processed lens surface is transported while being in contact with the flat plate of the mounting table, there is a problem in that the lens surface is scratched during transportation.

(Purpose) The purpose of the present invention is to eliminate the drawbacks of the conventional press optical material and press lens conveying device described above, eliminate the need to change the mounting table depending on the shape of the lens, and provide a compact and long-lasting device. To provide a low-cost press optical material and a press lens conveying device that can stably convey a press lens over a period of time.

(Summary) The present invention is capable of attaching and detaching the optical material for press and the press lens to the conveyance mounting table in the conveyance device, can be arbitrarily designed according to the shape of the lens, and is capable of handling the optical material for press before molding. The invention is characterized by a carrier having a stepped part for placing the optical material on which the molded press lens is placed, and a stepped part for press lens placing on which the pressed lens after molding is placed, and capable of stably transporting the optical material and the lens. .

(Example) The present invention will be explained below based on the illustrated example.

FIG. 1 is a side view in the conveying direction showing an embodiment of the present invention, in which a part of the conveying device for press optical materials and press lenses is cut out, and FIG. It is a sectional view along the AA line. As shown in FIG. 1, the conveying device 11 of this embodiment is a molding device 12 consisting of an upper mold 13 and a lower mold 14 of a press.
The optical material 17 for pressing is pushed through the heating furnace 15 from the left side by a drive device not shown in the figure.
(See Fig. 2) and conveys the molded press lens 18 to the right lehr 16, and a carrier 22 that is removably fitted into this magazine 19. It is configured.

As shown in FIGS. 1 and 2, the magazine 19 is composed of a horizontally long channel-shaped frame having both legs having a U-shaped cross section, and the lower end surfaces of the legs are the bottom surfaces of the heating furnace 15 and the slow cooling furnace 16. A plurality of them are successively moved in the longitudinal direction on a rail 20 laid on top by a drive device (not shown). For example, three through holes 21a (see FIG. 2) are provided on the top surface of each magazine 19 at equal intervals in the longitudinal direction.
are drilled, and all the through holes 21a of the continuous magazines 19 are arranged at equal intervals. A through hole 21b into which a drive pin (not shown) is inserted is formed in the center of one side wall of each magazine 19 facing each of the through holes 21a.

The carrier 22 has a donut-shaped planar shape as shown in FIG.
Near the lower part of the inner peripheral surface of the central through hole 23 through which the optical material 4 is inserted is an optical material mounting step having an inner diameter slightly (about 0.1 mm) larger than the outer diameter of the optical material 17 for press (see Fig. 2). A press lens mounting step 25 having an inner diameter approximately 1 mm larger than the outer diameter of the press lens 18 (see FIG. 1) is provided above the press lens 18 (see FIG. 1). The outer diameter of the lower part of the carrier 22 is such that it can be loosely fitted into the through hole 21a of the magazine 19, and the upper part has a flange 2 for preventing it from coming off from the through hole 21a.
6 is provided. And this Carrier 22
are optical material 17 for press and press lens 18
is placed thereon and transported by the magazine 19.

The reference numeral 27 in FIG. 2 indicates that the carrier 22 on the magazine 19 is connected to the upper die 13 and the lower die 1.
When the optical material 17 on the carrier 22 is pushed up toward the upper mold 13 by the lower mold 14, a fork-shaped holding plate (see Fig. 4) is used to hold down the carrier 22. ), and as shown in FIG.
direction, and presses the upper surface of the flange 26 of the carrier 22 with the fork. Further, a drive pin (not shown) is inserted into the through hole 21b of the magazine 19 from a direction perpendicular to the conveyance direction of the magazine 19, and the drive pin is intermittently moved in the conveyance direction by the distance between each through hole 21b. By doing so, the magazine 19 is configured to intermittently transport one carrier 22 to a predetermined position of the molding device 12.

Next, the transport device 11 and carrier 2 of this embodiment
The effect of 2 will be explained. A magazine drive device (not shown), which moves the magazine 19 by inserting a drive pin (not shown) into its through hole 21b and intermittently feeds the carriers 22 one by one to the molding device 12, is connected to the entrance of the heating furnace 15. Then, the magazines 19 are fed out toward the molding device 12 in a continuous manner without any gaps as shown by the arrow a in FIG. Then, the optical material 17 placed on the optical material mounting step 24 of the carrier 22 of the magazine 19 is transferred to the heating furnace 1.
The molding material is conveyed while being heated within the molding device 12, and reaches a predetermined molding temperature when it reaches the press shaft of the upper mold 13 and lower mold 14 of the molding device 12. Then, it temporarily stops at this position. Next, the presser plate 27 plunges toward the upper surface of the carrier 22 and presses the flange 26 of the carrier 22. Then, the lower die 14 passes through the through hole 23 of the carrier 22 and pushes up the optical material for press 17 placed on the step 24 of the carrier 22 toward the upper die 13, and the upper die 13 and the lower die are pushed up. This is pressed by the mold 14 to form a press lens 18. This press-molded press lens 18 is held in a pressed state for a predetermined period of time, and after waiting for the press lens 18 to solidify, the lower mold 14 is lowered. At this time, since the lower mold 14 is about 10° C. higher than the upper mold 13, the press lens 18 descends with respect to the lower mold 14 and the upper mold 13
The mold is preferably released from the mold. The lower die 14 is the carrier 2
When passing through the through hole 23 of No. 2, the press lens 18 placed on the lower mold 14 has a protruding portion (not shown) that protrudes from the peripheral surface during press molding, which is used for placing the press lens of the carrier 22. By coming into contact with the step 25, the press lens 18 is released from the lower mold 14 and is preferably placed on the step 25 of the carrier 22 in a stable state. When the lower mold 14 is completely lowered, the magazine drive device (not shown) is activated to move the magazine 19 until the next carrier 22 reaches the press shaft of the molding device 12. At this time, the press lens 18 is placed on the carrier 22, fed into the lehr 16, and is annealed while being conveyed within the lehr 16. The annealed press lens 18 can be easily taken out from the carrier 22 at the exit of the annealing furnace 16. The magazine 19 loaded with the carrier 22 sent out from the lehr 16 is automatically or manually returned to the entrance of the heating furnace 15 and used again in the same manner as described above.

As explained above, according to the present invention, an optical system for press lenses that completely eliminates all of the above-mentioned drawbacks of conventional conveying devices of this type by simply providing a carrier with an extremely simple structure. It is possible to provide a conveyance device for materials and press lenses. Particularly, a unique effect of the conveying device for press optical materials and press lenses of this embodiment is that since the conveyance means is not a conveyor type but a pin drive type, the magazine 19 can be moved regularly and intermittently. , the position of the press lower die through hole 21a of the magazine 19 stably matches the press shaft position. FIG. 5 is a schematic plan view of a conveying device for an optical material for press and a press lens showing another embodiment of the present invention, and FIG. 6 is an enlarged sectional view taken along line BB in FIG. be. The conveyance device 31 of this embodiment also uses a carrier 22A that is basically configured in exactly the same way as the carrier 22 used in the conveyance device 11 of FIG. 1 above. Therefore, the same carrier 22A (7th
(see figure) will be used as is in this embodiment, and its explanation will be omitted. However, since the carrier 22A in this embodiment is transferred from the carrier mounting table into the molding apparatus, the flange 26 is formed on the outer periphery of the upper end, and the lower cylindrical portion is formed slightly longer, as shown in FIG. ing.

As shown in FIGS. 5 and 6, this conveying device 31 includes a heating furnace 3 disposed in parallel on a base 50.
2 and an annealing furnace 33, conveying caterpillars 35a and 35b which are intermittently driven by a drive gear 34 with the carriers 22A placed at equal intervals inside the heating furnace 32 and an annealing furnace 33, and the heating furnace 32.
A molding device 36 consisting of an upper mold 37 and a lower mold 38 is located between the outlet of the cooling furnace 33 and the entrance of the lehr 33.
A final heating heater section 37a and a slow cooling start heater section 3 are disposed between the forming device 36, the outlet of the heating furnace 32, and the inlet of the slow cooling furnace 33, respectively.
7b, and a press molding device 36 that passes from the outlet of the heating furnace 32 into the final heating heater section 37a.
Its main parts are composed of a carrier carrying arm 38a that carries the carrier 22A to the press molding device 36, and a carrier carrying arm 38b that carries the carrier 22A from the press molding device 36 to the entrance of the slow cooling furnace 33 through the slow cooling start heater part 37b. ing.

As shown in FIG. 6, the press molding device 36 has an upper mold 37 fixed to its upper part, and a carrier arrangement table 39 made of a bottomed cylindrical body on which the carrier 22A is placed at the lower part of the upper mold 37. It is adjustably mounted with a mounting screw 41. This adjustable carrier arrangement table 39 has a through hole 2 of the carrier 22A arranged in a through hole 40 bored in its bottom wall.
The lower mold 38 is adjusted so that it can smoothly pass through the inside of the mold 3. In addition, in FIG. 6 of the lower part of this carrier arrangement table 39, both the heater parts 37a, 37 are shown.
Notch holes 42 are provided in the left and right side walls corresponding to b.
a, 42b are drilled, and these notch holes 4
The carrier conveying arms 38a, 38b move in and out of the carrier placement table 39 through the carrier arrangement base 39 through 2a, 42b.

The carrier conveying arms 38a and 38b are each driven by a drive device 43 equipped with a cylinder (not shown) that drives the arms horizontally and vertically.
a, 43b, and the distal end is connected to the flange 2 of the carrier 22A, as shown in FIG.
Two parallel holding plates 44a and 44b, each of which has a cutout at its center tip so as to sandwich the holding plate 6, are attached by mounting screws 45.

Next, the conveyance device 3 of this embodiment configured as described above will be described.
The effect of No. 1 will be explained.

First, as shown in FIG. 5, carrier mounting holes 51 (see FIG. 6), which are bored at equal intervals on the caterpillar 35a exposed outside the entrance of the heating furnace 32, are filled with holes 51 (see FIG. 6).
A carrier 22A is placed on which an optical material for press 52 (see FIG. 6) is placed on its optical material placement step 24. Next, the optical material 52 for pressing is placed on the carrier 22A, and is intermittently moved by the arrow c.
The heating furnace 3 is heated by the caterpillar 35a moving in the direction
2, from 20℃ to 60℃ from the specified forming temperature during pressing.
It is heated so as to reach saturation at a temperature lower than 0.degree. C. and is transported, and reaches the outlet of the heating furnace 32. Heating furnace 3
The carrier 22A that has reached the exit of
The film is transported inside the final heater section 37a toward the carrier arrangement table 39 of the molding device 36 in a direction perpendicular to the traveling direction of the film. That is, the carrying arm 38a is first moved horizontally toward the carrier 22A on the caterpillar 35a by its driving device 43a, and the flange 26 of the carrier 22A is held between the holding plates 44a and 44b at its tip. Next, the carrier 22A is lifted by the drive device 43a, and then moved to the final heater section 37.
It is transported horizontally through the inside of a toward the carrier arrangement table 39 of the press forming apparatus 36.
At this time, the temperature of the optical material 52 on the carrier 22A is temporarily stopped for a short time (about 10 seconds to 100 seconds) at the center of the final heating heater section 37a.
The molding temperature is raised by 20°C to 60°C to reach the desired molding temperature. The carrier 22A carrying the optical material 52 for pressing that has reached a predetermined temperature is then transported onto the carrier placement table 39 of the molding device 36, and is placed on the carrier placement table 39 of the molding device 36.
9. After the carrier 22A has been placed on the placement table 39 in this manner, the carrying arm 38a moves backward horizontally and returns to the initial standby position. Carrier 22 placed on the placement table 39
The optical material 52 on A is attached to the lower mold 38 of the molding device 36.
As a result of this rise, press molding is carried out by the upper die 37 and the lower die 38 in exactly the same way as in the case of the molding apparatus 12 shown in FIGS. 1 and 2 above. Similarly, the press lens 53 which has been press-molded is preferably released from the upper mold 37 and the lower mold 38, and is placed on the press lens mounting step 25 on the carrier 22A, and placed on the arrangement table 39. left behind. Meanwhile, in synchronization with the completion of molding of the press lens 53, the transport arm 38b moves from the standby position shown in FIG. 22A, and convey the same carrier 22A through the slow cooling start heater part 37b onto the conveying end part (the right end part in FIG. 5) of the caterpillar 35b,
After being placed on the caterpillar 35b, it returns to the waiting position. The press lens 53 is gradually cooled while passing through the slow cooling start heater section 37b, and after being transferred onto the caterpillar 35b, it is transported inside the slow cooling furnace 33 by the intermittent movement of the caterpillar 35b. It is further cooled and taken out from the carrier 22A on the caterpillar 35b at the exit of the lehr 33.

As explained above, the conveying device 31 in this embodiment, as well as the conveying device 11 shown in FIG. I can do it.

The unique effect of this embodiment is that the optical material is heated to a predetermined molding temperature in a short time by the final heating heater part 37a immediately before molding, so that variations in molding temperature can be reduced, and furthermore, the optical material Since the time for the material to reach its maximum temperature is short, the life of the carrier can be extended.

(Effects) As described above, the conveying device for the optical material for press and the press lens according to the present invention does not require the use of expensive materials or coating on the mounting table for conveying the optical material for press. Costs can be further reduced. The device as a whole is highly versatile because it has a simple structure and uses a carrier that can be easily replaced to match the shape of the lens.
The carrier can easily release the press lens from the mold. The carrier can transport the optical material for press and the press lens in a stable state even after molding, so it has many remarkable effects such as preventing scratches on the lens surface.

[Brief explanation of drawings]

FIG. 1 is a side view of the main parts of a conveying device for a press optical material and a press lens, showing an embodiment of the present invention;
FIG. 2 is an enlarged cross-sectional view of the main part along the line A-A in FIG. 1, FIG. 3 is an enlarged cross-sectional view of the carrier used in the conveyance device shown in FIG. FIG. 1 is a perspective view of the pressing plate of the press device in the conveyance device, FIG. 5 is a plan view of the press optical material and press lens conveyance device showing another embodiment of the present invention, and FIG. 6 is the above-mentioned conveyance device. 5 is an enlarged sectional view taken along line BB in FIG. 5, FIG. 7 is an enlarged sectional view of a carrier used in the conveyance device shown in FIG. 5 above, and FIG. FIG. FIG. 9 is a perspective view of a main part showing an example of a conventional press gob and press lens conveying device, and FIG. 10 is a sectional view of a main part showing an operating mode of the press device in FIG. 1. 11, 31... Conveyance device, 12, 36... Press device (glass lens press device), 17, 52
...Optical material, 19...Magazine, 22, 22A
...Carrier, 24...Stepped section for placing optical material, 2
5... Stepped part for press lens placement, 35a, 35b
...Kiyatapira.

Claims (1)

[Scope of Claims] 1. A conveying device for optical materials and press lenses in a glass lens molding apparatus using a lower die push-up press method, which is detachably attached to a mounting table for conveying optical materials for press and press lenses, It has a through hole in the center through which the lower mold of the press is inserted, and on the inner surface of the through hole there is a stepped part for placing the optical material for pressing during heating, and a press lens for slow cooling. A conveying device for press optical materials and press lenses, characterized by comprising a carrier provided with a stepped section for placing press lenses.