JPH0517167A - Transporting mechanism in glass molding device - Google Patents

Abstract

PURPOSE:To readily control positioning in such a way that the central shaft of optical glass material placed and supported on a transporting arm is always coincident with the shaft center of an upper and a lower molds and to smoothly carry out positioning stopping operation without causing impact. CONSTITUTION:A transporting arm driving part 13 for conveying an optical glass element to a preheating furnace 9, a heating furnace 10 and a main part 6 of molding is set on a device stand 14 of a glass molding device 3. The transporting arm driving part 13 is constituted so as to control movement in the transporting direction and a direction perpendicular to the direction and positioning. A transporting arm 1 is fixed to the transporting arm driving part 13.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conveying mechanism in a glass forming apparatus constructed so that an optical glass material can be placed and supported to be carried in and out of a heating furnace and a molding chamber.

[0002]

2. Description of the Related Art Generally, in a glass forming apparatus in which an optical glass material is heat-softened to a moldable viscosity, the heat-softened optical glass material is pressure-molded by upper and lower molds, and then annealed. Uses a transfer arm as a means for carrying the optical glass material into and out of the heating furnace and the molding chamber. This transfer arm
It is designed to be driven and operated via a drive device such as a cylinder.It is carried in and out of the heating furnace and the molding chamber with the optical glass material mounted and supported on the mounting part provided at the tip of the arm. Is configured.

An example of the transport mechanism having such a structure is the invention described in Japanese Patent Application Laid-Open No. 62-182122 previously proposed by the present applicant. This will be described below with reference to FIGS. 9 to 14.

FIG. 9 is a perspective view of a glass molding device 63 for molding an optical glass element 62 equipped with a transfer arm 61, and FIG.
0 is a vertical cross-sectional view of the glass forming device 63, FIG. 11 is a perspective view of the gob tray transfer mechanism portion, and FIG. 12 is a perspective view of the engagement contact portion.
13 is a sectional view of FIG. 12, and FIG. 14 is a side view of the taper pin.

The glass forming device 63 includes an upper and a lower forming die 6.
Molding body 66 equipped with 4, 65, mold release ring drive 67 for separating the molded glass lens from upper and lower molds 64, 65, and an optical glass element mounted on magazine 68. The preheating furnace 69, the main heating furnace 70, and a transfer arm driving unit 73 for transferring the molding 62 to the molding point 72 in the molding chamber 71, an apparatus base 74, and the like.

The transfer arm drive section 73 is provided for the transfer arm 61.
To move the transfer arm 61 forward and backward through three cylinders 73a, 73b, and 73c arranged in three stages at each position of the preheating furnace 69, the main heating furnace 70, and the molding point 72. The settings are configured so that stop control can be performed. Reference numeral 75 indicates each cylinder 73a, 73b, 7
3c is a stopper for using the operation amount regulation.

The optical glass element 62 is placed and supported on a magazine 68 via a gob plate 76, and the magazine 68 is mounted on the magazine 68.
The upper gob tray 76 is transferred and supported on a gob tray support portion 77 formed at the tip of the transfer arm 61 as shown in the figure.

The optical glass element 62 preheated in the preheating furnace 69 is transferred onto the transfer arm 61 by the gob plate transfer mechanism section shown in FIG.
It is set so as to be conveyed into the main heating furnace 70 via 1 and stop-controlled.

The gob plate support portion 77 of the transfer arm 61
As shown in FIGS. 12 and 13, an engagement contact portion 79 that engages with and abuts the engagement contact portion 78 disposed on the molding chamber 71 side is provided in the vicinity. The engagement contact portion 79 has a fitting hole 81 formed in the stopper plate 80 on the engagement contact portion 78 side.
And a stopper bolt 83 that contacts the contact surface 80a of the stopper plate 80. It is set up.

As shown in FIG. 14, the taper pin 82 has a pin body portion 82a which fits in the fitting hole 81, a taper portion 82b formed at the tip portion, and a screw portion 8 which is screwed at the rear portion.
2c, and the support portion 84 has a screw portion 8
It is fixed via a nut 85 screwed with 2c. The stopper bolt 83 is set so that its protruding length can be adjusted via the nut 86.

The engaging contact portion 78 on the molding chamber 71 side is composed of an L-shaped stopper plate 80 and a fitting hole 81 that fits into the taper pin 82. The stopper plate 80 is shown in the drawing. As shown, it is fixed to the inner surface of the upper plate 88 via the bolt 87 in a vertically suspended state. The positional relationship between the engaging and abutting portions 78 and 79 is determined by the optical glass element 62 mounted on the transfer arm 61.
When the central axis of the is aligned with the axis of the upper and lower molds 64 and 65, the taper pin 82 fits into the fitting hole 81, and
The stopper bolt 83 is set so that it is positioned by contacting the contact surface 80a of the stopper plate 80.

Of the gob trays 76 on the magazine 68 discharged from the supply chamber 89, when the gob tray 76 on which the optical glass element 62 to be molded is placed reaches the preheating furnace 69, the magazine 68 is opened. It stops and preheats the optical glass element 62 with the gob dish 76.

Next, the piston rod 91 of the push-up cylinder 90 is lifted to push up the gob tray 76 on the transfer arm 61, and then the first cylinder 73a is operated to operate as shown in FIG.
As shown by 1, the gob plate 76 is transferred onto the transfer arm 61.

Next, the second cylinder 73b is operated to advance the transfer arm 61 and stop it in the main heating furnace 70 to heat the optical glass element 62 to a temperature above the transition point. As a result, the optical glass element 62 is heated and softened to have a moldable viscosity.

Next, the third cylinder 73c is operated to transfer the transfer arm 61 into the molding chamber 71. Transport arm 6
1, the engaging contact portion 79 has the engaging contact portion 78 on the molding chamber 71 side.
It stops at the position where it engages with and abuts. In this state, the central axis of the optical element 62 placed on the transfer arm 61 and the axial centers of the upper and lower molding dies 64, 65 are aligned.

[0016]

However, the above-mentioned prior art has the following problems.

That is, in the conventional transporting mechanism, the central axis of the optical glass element 62 and the upper and lower molding dies 64, 6 are used.
As the transport positioning means for aligning the axis of 5 with the transport arm 61 and the forming chamber 71, engaging abutting portions 78 and 79 are provided, and the taper pin 82 is fitted into the fitting hole 81.
The stopper bolt 83 contacts the contact surface 80a of the stopper plate 80 and is positioned.

However, when the positioning operation is repeatedly performed by the above-described positioning method, there is a problem that the fitting accuracy and the abutting section are worn and the positioning accuracy is deteriorated.

Further, at the time of fitting and abutting, there arises a problem that powder generated due to abrasion or the like falls on the optical glass element and deteriorates the appearance quality of the molded product.

Further, when molding several kinds of optical glass elements, since the temperature conditions are different, the carrier arm 6 is used.
The amount of thermal deformation of No. 1 is different, and the position of the engaging contact member has to be adjusted every time the temperature condition is changed, which causes a problem that it takes time.

Further, the stopper bolt 83 is connected to the stopper plate 8
When the optical glass element 62 is brought into contact with the contact surface 80a of 0, the optical glass element 62 is displaced (tilted) due to the impact, and molding cannot be performed at an accurate molding position. Therefore, the transferability of the molded product is deteriorated. Give rise to.

Therefore, the present invention has been made to solve the above-mentioned problems, and the positioning control of the stop position of the transfer arm can be easily performed without using the engaging abutting member. An object of the present invention is to provide a conveying mechanism in a glass forming apparatus capable of smoothly performing a positioning stop operation.

[0023]

DISCLOSURE OF THE INVENTION The present invention relates to a conveying mechanism in a glass forming apparatus, which is constructed such that an optical glass material is placed and supported and can be carried in and out at a predetermined position in a heating furnace and a molding chamber. A drive table capable of moving and positioning in the carrying direction and a direction perpendicular to the carrying direction is provided, and a carrying arm for mounting and holding the optical glass material is fixedly mounted on the tip of the driving table.

[0024]

According to the present invention, the transport arm for mounting and holding the optical glass material is fixedly mounted on the drive table whose movement and positioning are controllable, so that the central axis of the optical glass material and the axial center of the upper and lower molding dies. You can always match.

[0025]

[Embodiment 1] FIG. 1 is a perspective view of a glass molding apparatus 3 for molding an optical glass element 2 (see FIG. 2) equipped with a transfer arm 1, and FIG. 2 facilitates understanding of each component of FIG. FIG. 3 is a vertical cross-sectional view of the glass forming apparatus 3 whose cross-section is formed to be

The glass molding apparatus 3 includes upper and lower molds 4 and 5.
A molding body 6 equipped with a mold, a mold release ring driving unit 7 for separating the molded glass lens from the upper and lower molds 4 and 5, and an optical glass element 2 mounted on a magazine 8 as a spare. A heating furnace 9, a main heating furnace 10, and a transfer arm drive unit 13 for transferring to a molding point 12 in the molding chamber 1,
It is composed of the device base 14 and the like.

Transport arm drive unit (drive table) 13
Is for moving the transfer arm 1 forward and backward, and is set by a controller (not shown) so as to stop and control the transfer arm 1 to each position of the preheating furnace 9, the main heating furnace 10 and the molding point 12. I am doing it. Transfer arm drive unit 13
Is composed of a conveyance direction drive unit 13a and a conveyance right-angle direction drive unit 13b movable in a direction perpendicular to the conveyance direction, which are motors 15a and 15b, ball screws 16a and 16b, guides 17a and 17b, and a table 1, respectively.
8a, 18b, a position detector (not shown), and the like. Then, these are driven by the motors 15a and 15b.

The optical glass element 2 is placed and supported on the magazine 8 via the gob tray 19, and the gob tray 19 on the magazine 8 is formed at the tip of the transfer arm 1 as shown in FIG. It is adapted to be transferred to and supported on the gob plate support portion 20 thus formed. 3 to 6 show a configuration in which the gob tray 19 on the magazine 8 is transferred onto the gob tray support portion 20 of the transport arm 1. That is, as shown in FIGS. 2 and 3, a cylinder 21 for pushing up the gob tray 19 is arranged at a lower position of the magazine 8, and as shown in FIG.
The push-up portion 23 at the tip of the piston rod 22 of the cylinder 21 is set so that the gob tray 19 can be temporarily pushed up from the magazine 8.

The transfer arm 1 is arranged on the upper side of the magazine 8 and is moved in the direction of the arrow 24 in FIG. 4 via the drive unit 13, and as shown in FIG. It is set so that the axis of the rod 22 can be operated to the position where the axis is coaxial with the axis of the gob tray support 20.

By moving the piston rod 22 downward in the state shown in FIG. 5, the gob tray 19 can be transferred onto the gob tray support portion 20 of the transfer arm 1 as shown in FIG. The settings are configured so that it can be done.

A magazine 8 with a plurality of gob plates 19 placed thereon
Are sequentially conveyed from inside the supply chamber 26, and the magazine 8 supporting the gob plate 19 on which the glass lens after the molding is completed is set to be housed in the housing chamber 27. is there. The gob trays 19 on the magazine 8 that are sequentially transported from the supply chamber 26 are first controlled to be stopped in the preheating furnace 9.

The optical glass element 2 preheated in the preheating furnace 9 is transferred onto the transfer arm 1 by the gob plate transfer mechanism shown in FIGS. 3 to 6, and is transferred via the transfer arm 1. It is set so that it is carried into the main heating furnace 10 and stopped and controlled.

The transport mechanism in the glass forming apparatus having the above-described structure is such that the gob tray 19 on which the optical glass element 2 to be molded is placed out of the gob trays 19 on the magazine 8 discharged from the supply chamber 26. When 19 reaches the inside of the preheating furnace 9, the magazine 8 is stopped and the optical glass element 2 is preheated together with the gob plate 19.

Next, the piston rod 22 of the push-up cylinder 21 is raised to push up the gob tray 19 on the transfer arm 1, and then the transfer direction drive section 13a is operated to operate the drive mechanism shown in FIGS.
The gob tray 19 is transferred onto the transfer arm 1 in the operation sequence shown in FIG.

Next, the conveying direction driving unit 13a is operated again to move the conveying arm 1 forward, and the conveying arm 1 is stopped in the main heating furnace 10 to stop the optical glass element 2 at a temperature above the transition point, for example, a temperature above 600 ° C. Heat to. As a result, the optical glass element 2 is heated and softened to have a moldable viscosity.

Next, the transport direction drive unit 1 is again carried out.
3a is operated to transfer the transfer arm 1 into the molding chamber 11. The transfer arm 1 is stopped by a control device (not shown) at a position which has been set and set in advance by the temperature condition at the time of molding before molding.

In this state, the central axis of the optical glass element 2 placed on the transfer arm 1 and the axial centers of the upper and lower molding dies 4 and 5 are surely aligned with each other. In the present embodiment, even if the transfer arm 1 expands due to thermal deformation in the main heating furnace 10, it is positioned in advance under the same temperature condition. Therefore, the central axis of the optical glass element 2 is placed in the upper and lower molds 4, 5. It can be molded in a state in which it coincides with the axis center of.

According to this embodiment, the center axis of the optical glass element 2 mounted and supported on the transfer arm 1 is always aligned with the axis of the upper and lower molds without using the engaging and abutting member. Positioning can be controlled easily, and when molding several types of optical glass elements, even if the temperature conditions are different, it is only necessary to set the stop position under each temperature condition in advance, so the adjustment work during setup is troublesome. The effect that it can be omitted is also obtained. Also, the same amount can be obtained by measuring the amount of expansion of the transfer arm 1 due to temperature change in advance and driving the transfer direction drive unit 13a and the transfer right-angle direction drive unit 13b during actual positioning to correct the position. The effect is obtained.

[0039]

[Embodiment 2] FIGS. 7 and 8 show this embodiment, FIG. 7 is a plan view of an essential part, and FIG. 8 is a sectional view of the essential part.

The present embodiment is different in that the heat-resistant displacement sensor 31 in the transport direction and the heat-resistant displacement sensor 32 in the transport right-angle direction are provided in the molding chamber 11 in the first embodiment, and the other components are the same. However, the description thereof is omitted.

In this embodiment, the optical glass element 2 mounted and supported on the transfer arm 1 is transferred to a position where the central axis of the optical glass element 2 coincides with the axis of the upper and lower molding dies and the position facing the end face 1a in the transfer direction of the transfer arm 1. The direction heat resistant displacement sensor 31 is installed at a position where the direction heat resistant displacement sensor 31 faces the end surface 1b in the direction perpendicular to the transfer.

The conveyance direction heat-resistant displacement sensor 31 and the conveyance right-angle direction heat-resistant displacement sensor 32 are fixed to fixtures 33 and 34 made of a material that is not affected by temperature, and these fixtures 33 and 34 are lower plates. It is fixed to 35. The conveyance direction heat resistant displacement sensor 31 detects the distance from the conveyance direction end face 1a of the conveyance arm 1, and the conveyance right angle direction heat resistance displacement sensor 32 detects the distance from the conveyance right direction end face 1b.

The carrying mechanism in the glass forming apparatus having the above-mentioned structure heats the gob tray 19 on which the optical glass element 2 is placed by the carrying arm 1 and carries it into the molding chamber, as in the first embodiment.

At this time, the transfer arm 1 includes the transfer direction heat-resistant displacement sensor 31 and the transfer right-angle direction heat-resistant displacement sensor 32.
By detecting the distance between the end surface 1a in the conveying direction and the end surface 1b in the conveying right direction, the motors a and b (not shown) are driven to stop the positioning at a fixed position. In this state, the central axis of the optical glass element 2 placed on the transfer arm 1 and the axial center of the upper and lower molding dies are surely aligned with each other.

In this embodiment, even if the transfer arm 1 is thermally deformed and expanded in the main heating furnace, the transfer-direction heat-resistant displacement sensor 31 and the transfer-perpendicular-direction heat-resistant displacement sensor 32 form the transfer-direction end face of the transfer arm 1. 1a and the conveying right-angle direction end face 1b are detected and the conveying direction drive unit and the conveying right-angle direction drive unit are positioned and stopped so as to keep a constant distance. Therefore, the central axis of the optical glass element 2 is moved up and down. It can be molded in a state where it matches the axis of the mold.

According to this embodiment, the center axis of the optical glass element 2 mounted and supported on the transfer arm 1 is always aligned with the axis of the upper and lower molds without using the engaging and abutting member. Positioning can be easily controlled, and since it is not necessary to positionally adjust the stop position before molding, it is possible to save the time and effort for adjustment when changing the conditions.

[0047]

As described above, according to the carrying mechanism in the glass forming apparatus of the present invention, the central axis of the optical glass material placed and supported on the carrying arm is used without using the engaging and abutting member. The positioning control can be easily performed so that the axis of the mold is always aligned with the axis of the upper and lower molds, and the positioning stop operation can be smoothly performed without impact.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment.

FIG. 2 is a vertical sectional view showing the first embodiment.

FIG. 3 is a process diagram showing Example 1.

FIG. 4 is a process drawing showing the first embodiment.

FIG. 5 is a process diagram showing Example 1.

FIG. 6 is a process diagram showing Example 1.

FIG. 7 is a plan view of an essential part showing a second embodiment.

FIG. 8 is a cross-sectional view of an essential part showing a second embodiment.

FIG. 9 is a perspective view showing a conventional example.

FIG. 10 is a vertical cross-sectional view showing a conventional example.

FIG. 11 is a perspective view showing a conventional example.

FIG. 12 is a perspective view showing a conventional example.

FIG. 13 is a cross-sectional view showing a conventional example.

FIG. 14 is a side view showing a conventional example.

[Explanation of symbols]

 1 Transfer Arm 2 Optical Glass Element 3 Molding Device 6 Molding Body 7 Mold Release Ring Drive 8 Magazine 9 Preheating Furnace 10 Main Heating Furnace 13 Transfer Arm Drive 14 Device Base 26 Supply Room 27 Storage Room

Claims (1)

Claim: What is claimed is: 1. A conveying mechanism in a glass forming apparatus, comprising an optical glass material placed and supported so that it can be carried in and out of a heating furnace and a predetermined position in a molding chamber. And a drive table capable of moving and positioning in a direction perpendicular to the transport direction, and a transport arm for mounting and holding the optical glass material at the tip of the drive table is fixed to the drive table. Conveying mechanism in molding equipment.