JPH11255527A - Production apparatus of flat glass and method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an apparatus for producing a flat glass, capable of suppressing a momentary bent and tilting of a turn table supporting a lower mold by the load at the pressing time to the minimum, and further to provide a method therefor. SOLUTION: This production apparatus of a flat glass has a freely rotatably supported turn table 4, plural lower molds 6 arranged along circumference direction of the turn table 4 and receiving a molten glass, at least one upper mold 7 and 9 arranged on a moving passage of the lower molds 6 at the position facing to the lower molds 6, and realizing the press of the molten glass with the lower molds by moving the upper mold 7 to the lower molds 6, at least one table-supporting means 20 installed in the lower part of the turn table 4 at the neighbor of the pressing position of the molten glass and pressing the turn table upward against the pressing force of the upper mold.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet glass manufacturing apparatus and a method for forming a sheet glass by pressing a molten glass, and more particularly to an advanced glass sheet for a magnetic recording medium used for a hard disk or the like. The present invention relates to a sheet glass manufacturing apparatus and method suitable for manufacturing pressed glass requiring flatness.

[0002]

2. Description of the Related Art In recent years, the areal recording density of magnetic recording media used in hard disk drives has been increasing at a remarkable rate. Since 1990, its recording density has increased at an annual rate of about 60%,
At present, recording media for hard disks having a recording density of 2 Gbits per square inch or more have already appeared. Hard disk drives are mounted on magnetic recording media that rotate at high speed.
Magnetic head (slider) supported by actuator
Is read and written by scanning in the radial direction of the medium. The magnetic head flies with a slight gap from the information recording surface of the magnetic recording medium due to the airflow generated by the high-speed rotation of the magnetic recording medium. At present, the flying height of the magnetic head relative to the recording surface is only about 40 nm to 50 nm, and the demand for minimizing the flying height is becoming more severe in conjunction with the demand for higher density.

[0003] Ensuring a stable flying height of a magnetic head is important for stable reading and writing of information. In order to secure a stable flying height of the magnetic head and to minimize the flying height, the surface of the magnetic recording medium must be flattened with extremely high precision, and especially the substrate used for the magnetic recording medium must be flattened. Is an extremely important elemental technology.

On the other hand, in recent years, a glass substrate has been attracting attention as an alternative to an aluminum substrate used for a magnetic recording medium, and its research and development have been active. The glass substrate is generally superior to the aluminum substrate in terms of strength, cost, and flatness. A glass substrate is formed by pressing molten glass (this is called glass cob) using an upper mold and a lower mold, cooling, polishing, and performing a necessary surface treatment (for example, chemical strengthening by an ion exchange method). And molded.

Heretofore, in order to improve the mass productivity, a manufacturing apparatus which presses molten glass is provided with a turntable which enables continuous pressing of molten glass. A plurality of lower molds are provided along the circumferential direction of the turntable, and the molten glass is sequentially supplied to the installation position of the upper mold. The upper mold and the air cylinder that drives it press the molten glass on the lower mold. Also,
If necessary, the manufacturing apparatus is provided with one or a plurality of upper molds for correcting warpage and an air cylinder for driving the same, and these presses correct the warpage of the glass after the above-mentioned forming press. The disk-shaped glass molded product which is molded by these presses and whose warpage is corrected is carried out of the above-mentioned manufacturing apparatus, passed through a natural cooling process, and delivered to the next process, that is, a polishing and surface treatment process.

[0006]

However, in the press using the upper die, there is a case where the turntable supporting the lower die is slightly instantaneously warped or tilted.
In particular, at the time of the first press for forming the glass cob into a disk shape, a load of as much as 2 tons acts on the turntable. Since the load point is provided in the vicinity of the peripheral edge farthest from the axis of the turntable, it is difficult to avoid this problem even if the support structure of the turntable is strengthened. Momentary warpage or tilting of the turntable results in slight tilting and misalignment of the lower press surface that is kept horizontal.

It is clear that the inclination and displacement of the press surface of the lower die affect the flatness of the glass molded product. Due to the inclination and displacement of the pressed surface, the pressure applied to the molten glass during pressing is not uniformly distributed, and as a result, the so-called "uneven thickness" in which the thickness of the glass molded product becomes uneven. With the improvement in recording density, it is expected that the requirements for the flatness of the magnetic recording medium will be more severe,
It is necessary to minimize the instantaneous warpage and tilt generated on the turntable during pressing.

Accordingly, it is an object of the present invention to provide an apparatus and a method for manufacturing a glass sheet which minimizes instantaneous warpage and inclination generated on a turntable at the time of pressing.

[0009]

According to the present invention, there is provided an apparatus for manufacturing sheet glass, comprising: a turntable rotatably supported; and a turntable supported in a circumferential direction of the turntable. A plurality of lower dies arranged along the lower die to receive the molten glass, and the lower glass is arranged to face the lower die on the movement path of the lower die, and the molten glass moves toward the lower die and the lower die. At least one upper die for realizing the press, and installed below the turntable in the vicinity of the molten glass press position, and presses the turntable upward against the pressing force of the upper die during the press. And at least one table support means. The table support means minimizes the warpage and inclination of the turntable during pressing and maintains the levelness of the lower press surface.

According to a second aspect of the present invention, the table supporting means is separated from the turntable when the turntable rotates.

According to a third aspect of the present invention, the table support means presses a peripheral portion on a lower surface of the turntable.

According to a fourth aspect of the present invention, the turntable is driven to rotate intermittently, and the table support means is driven in synchronization with the intermittent drive.

According to a fifth aspect of the present invention, the table support means is vertically movably supported, and has a pressing surface against the turntable and a first downward inclined surface having a predetermined angle with respect to a horizontal plane. A load receiving member, a driving member of the load receiving member, which is supported to be movable in a substantially horizontal direction, has a second upwardly inclined surface that is in surface contact with the first inclined surface and is inclined in the moving direction; A power source for driving the driving member.

According to the present invention, the molten glass is received by a plurality of lower dies arranged along the circumferential direction of the turntable, and is disposed to face the lower die on the moving path of the lower die. The upper mold supported as described above is moved toward the lower mold, and a method for producing a sheet glass in which the molten glass is pressed with the lower mold. Then, the turntable is pressed upward to release the pressing force from the turntable when the turntable is rotated.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. In this embodiment, an example in which the present invention is applied to a manufacturing apparatus for forming a glass substrate serving as a substrate of a magnetic recording medium used in a hard disk device will be described. However, the present invention is applicable to information recording media other than magnetic recording media, for example, optical recording media, glass substrates used for optical information recording media, filters for cameras, mask blanks, etc. Can be widely applied to the manufacturing apparatus.

FIGS. 1 and 2 are a side view and a plan view, respectively, showing the appearance of an apparatus for manufacturing the glass substrate to which the present invention is applied. The manufacturing apparatus 1 is provided with each apparatus for supplying and pressing molten glass, correcting its warpage, and carrying it out. The disc-shaped glass molded product formed by the present manufacturing apparatus 1 is carried out by the carry-out device 2 and transferred to a natural cooling conveyance path (not shown). After cooling here, it is transferred to a polishing step which is the next step.

In these figures, the manufacturing apparatus 1 includes a turntable 4 which is driven to rotate by a driving device 3. The driving device 3 is fixed to the device frame 5 horizontally installed with high precision, and the horizontal of the table installation surface 3a is maintained. The turntable 4 has a table mounting surface 3a.
As a result, the turntable 4 is rotationally driven while maintaining a high level of accuracy. In one embodiment, the turntable 4 is a metal disk having a diameter of 950 mm and a thickness of 50 mm. Near the periphery of the upper surface of the turntable 4, 16 lower dies 6a to 6p are installed. The lower dies 6 are arranged at equal intervals on the same circumference on the upper surface of the turntable 4. It should be noted that some lower molds are omitted in FIG. 1 to clearly show other components. Each lower die 6 is firmly fixed by inserting its lower half into a mounting hole opened in the turntable 4, and its pressing surface is kept horizontal. Lower mold 6
Basically, it is composed of a cylindrical body having a press surface on the upper surface, and a body that covers the periphery and is movable relative to the cylindrical body. Since it is the same as the target-lower type, description of its detailed configuration is omitted here. The lower die 6 rotates the turntable 4 for 1/16 step (turning the turntable in one step)
(1/16 turn)).

The manufacturing apparatus 1 is provided with various devices for supplying, pressing, correcting warpage, and discharging the molten glass on the moving path of the lower die 6. The supply of the molten glass is achieved by cutting the tubular molten glass from a melting furnace (not shown) by a cutting device (not shown) and dropping it on the press surface of the lower mold 6. The melting furnace and the cutting device are installed at a broken line position A in FIG. 2 by a support structure (not shown) that is raised upward from the device frame 5, and the lower mold (the lower mold 6 a in FIG. Into molten glass,
That is, glass bumps are supplied.

Pressing of the molten glass is achieved by an upper die 7 for pressing. The upper die for press 7 has a support structure 1
The air cylinder 8 is supported by the drive shaft of the air cylinder 8 and is movable in a direction in which the lower cylinder 6 comes into contact with and separates from the lower mold 6. Pressing of the molten glass on the lower die 6 is performed by the lowering operation of the upper die 7 for pressing. The upper die 7 for press
It is installed at the position B in FIG. 2 and presses the molten glass on the lower mold (the lower mold 6c in the figure) that comes directly under the glass, and
Form into a disk about 3mm thick. The warp correction of the disc-shaped glass is achieved by a plurality of warp correcting upper dies 9 arranged continuously downstream of the press upper die 7. In the present embodiment, since the pressing of the molten glass by the press upper die 7 is performed in a short time of about 2 seconds, the contact time between the upper die and the glass molded product is short, and the front and back sides of the pressed glass molded product are reduced. The heat exchange between the mold and each mold becomes uneven. Therefore, it is necessary to correct the warpage by one or more warp correcting upper dies after pressing. Each of the warp correcting upper molds 9 is basically composed of a cylindrical body and a body mold movable relative thereto, similarly to the press upper mold 7 described above.
It is suspended by an air cylinder 10. In this embodiment, three warp correcting upper molds 9 and an air cylinder 10 are provided, and these are located at positions C and C in FIG.
At D and E, it is supported by the support structure 11. The manufacturing apparatus 1 has heating devices 12 and 13 for heating the upper mold and the lower mold, whereby the temperature of each of the lower molds 6 and the upper molds 7 and 9 is at least the glass transition of the molten glass. It is kept above the point (about 500 ° C).

Next, the table support device 20 provided in the manufacturing apparatus 1 will be described. Table bearing device 20
Supports the turntable 4 from below under the load given by the press upper die 7 and the warp correction upper die 9. Since the load applied to the turntable 4 by the upper die press reaches as much as 2 tons, the turntable 4 at the load point is
Instantaneous warpage or tilt may occur. The table support device 20 supports the turntable 4 at the time of pressing,
It functions to minimize the instantaneous warpage and inclination.

3 and 4 are a side sectional view and a partially cutaway plan view of the table support device 20, respectively. FIG. 5 shows a side view as viewed from the arrow V in FIG. In these figures, the table bearing device 20 basically includes a vertical slide member 22, a horizontal slide member 23, and an air cylinder 24 as a drive source in a housing 21 having a substantially L-shaped appearance. I have. The vertical slide member 22 has a main body having a rectangular cross section, which is guided in a vertical wall of the housing 21 and is movable in the vertical direction. The upper end of the vertical slide member 22 is drawn upward from the upper opening 21 a of the housing 21, and the upper end surface 22 a is a contact surface with the turntable 4. The upper end face 22a
It is polished horizontally with high precision, and is preferably nitrocarburized for the purpose of improving wear resistance. A lower portion 22b of the vertical slide member 22 is formed wider than the main body, and a lower end surface thereof has an inclined surface 22c having an arbitrary angle with respect to a horizontal plane.
It has been. The inclined surface 22c is inclined along the movement direction of the horizontal slide member 23 described later, and is in surface contact with the inclined surface 23a on the horizontal slide member 23 side having the same inclination angle. The relative position between the two inclined surfaces 22c and 23a changes due to the movement of the horizontal slide member 23 described later,
The vertical slide member 22 is moved up and down. The movement amount of the vertical slide member 22, that is, the stroke is determined by the movement amount of the horizontal slide member 23 and the inclination angles of the inclined surfaces 22c and 23a. In one embodiment, when the movement amount of the horizontal slide member 23 is 25 mm and the inclination angle of the inclined surface with respect to the horizontal plane is 6 degrees, 2.63 mm is obtained as the stroke of the vertical slide member 22. In addition, as shown in FIG. 3, a contact member 4a can be appropriately provided at the lower surface position of the turntable 4 where the upper end surface 22a of the vertical slide member 22 contacts. In the embodiment, the abutting member 4a is a ring-shaped member having an appropriate width and provided on the lower surface peripheral portion of the turntable 4. The contact member 4a is preferably subjected to soft nitriding in consideration of friction caused by contact with the vertical slide member 22. However, if the smoothness of the contact surface of the vertical slide member 22 is guaranteed and the problem of friction is not serious, it is not always necessary to provide the contact member 4a.

The horizontal slide member 23 is a rectangular block member disposed below the vertical slide member 22 in the housing 21. The inclined surface 23a formed on the upper surface of the horizontal slide member 23 is formed to have the same inclination angle as the inclined surface 22c, and the two inclined surfaces 22c and 23a are always in surface contact regardless of their relative positions. . As is clear from the above description, the horizontal movement of the horizontal slide member 23, that is, the movement in the direction of the arrow AB in FIG. 3, causes the vertical movement of the vertical slide member 22, that is, the direction of the arrow CD, by these inclined surfaces. Is translated into a move. On the other hand, the horizontal slide member 23 functions to receive a load applied to the vertical slide member 22 below the vertical slide member 22. Regardless of the position of the vertical slide member 22, ie, whether it is slid upward in the direction of arrow C or downward in the direction of arrow D, the horizontal slide member 23 is always reinforced by the housing 21. Base 2
The vertical slide member 22 is supported on 1b. The preferred range of the inclination angles of the inclined surfaces 22c and 23a is 5 to 7 degrees with respect to the horizontal plane. If the inclination angle is in this range, the vertical slide member 22 and the load applied thereto are resisted,
Since the horizontal slide member 23 can be moved and the horizontal component force due to the load applied to the vertical slide member is extremely small, a stable load-bearing structure can be realized.

The air cylinder 24 is a driving device for driving the horizontal slide member 23 at an arbitrary stroke. Basically, the air cylinder 24 drives the horizontal cylinder member 23 integrated with the piston 26 by moving the piston 26 back and forth by air pressure from an air supply source 25 (see FIG. 4). Piston 26
Is slidable relative to a cylinder body 27 installed in the housing 21, and one end thereof is connected to the horizontal slide member 23 in the housing 21. The other end of the piston 26 extends out of the housing 21. Inside the air chamber 27a of the cylinder body 27, a flange member 28 inscribed in the inner wall is provided.
Is arranged. The flange member 28 includes the piston 26
And slides in the air chamber 27a integrally therewith. Therefore, the air chamber 2 of the flange member 28
The moving distance in 7a determines the stroke of the piston 26 and thus the horizontal slide member 23. The fine adjustment of the stroke of the piston 26 is performed by an adjustment screw 3 described later.
2 can be performed.

As shown in FIG. 4, the air pressure from the air supply source 25 is supplied to the air chamber 27a through two air supply passages 25a and 25b. One air supply path 2
5a is communicated from the rear wall of the air chamber 27a into the chamber,
This is a supply path for pressing the flange member 28 behind the air chamber 27a forward, that is, for moving the piston 26 forward. The other air supply passage 25b is provided with an air chamber 27.
The supply path communicates from the front wall of the air chamber 27a into the chamber and presses the flange member 28 in front of the air chamber 27a rearward, that is, moves the piston 26 rearward. FIG.
, The flange member 28 is located behind the air chamber 27a (that is, the piston 26 is retracted), the vertical slide member 22 is in the lowered position, and the upper end surface 22a is Are separated from each other with a slight gap (standby state). In the embodiment, the distance between the turntable 4 and the upper end surface 22a of the vertical slide member 22 is about 1.5 to 2 mm. By guiding air from the air supply source 25 into the air chamber 27a through the air supply passage 25a from this state, the flange member 28 is pushed forward (that is, the piston 26 is pushed forward).
As a result, the vertical slide member 22 becomes the horizontal slide member 2.
3 lifts upward and supports the lower surface of the turntable 4 from below. On the other hand, by supplying air from the air supply passage 25b into the air chamber 27a, the flange member 28 is pushed rearward, and the piston 26 retreats. As a result, the vertical slide member 22 which has lost the pressing force of the horizontal slide member 23 basically falls downward by its own weight and returns to the standby position separated from the turntable 4.

However, in this embodiment, the vertical slide member 22 is always pulled downward by a pair of coil springs 29, as clearly shown in FIG. Configured to be achieved. That is, the coil attachment member 3 attached to the upper end of the vertical slide member 22
A pair of coil springs 29, 29 for applying a pulling force, are attached between 0 and an attachment pin 31 attached to the side surface of the housing 21 at a position lower than 0. The vertical slide member 22 is constantly urged downward by the tensile force of the coil spring 29, and is pulled downward when the pressing force of the horizontal slide member 23 is lost. Further, the pair of coil springs 29, 29 also functions to stably raise the vertical slide member 22. In FIG. 5, the same coil springs 29, 29 apply a uniform load to both sides of the vertical slide member 22 in the width direction. The load by the coil spring 29 causes the inclined surface 22c of the vertical slide member 22 to be always in close contact with the inclined surface 23a of the horizontal slide member 23. Even when the vertical slide member 22 is lifted, the above-mentioned inclined surface is brought into close contact with the load of the coil spring 29, and
Stabilization.

In FIG. 3, an adjusting screw 32 is provided at the rear end of the piston 26. The stroke width of the piston 26 can be changed by adjusting the screwing amount of the adjusting screw 32 into the piston 26. Specifically, a male screw 26a is provided at the end of the piston 26.
Are adjusted, and the adjusting screw 32 is configured as a female screw.
Is screwed here. By adjusting the amount of screwing of the adjusting screw 32 into the end surface 21c on the housing 21 side, the adjusting screw 32 can abut on the side surface 21c before the flange member 28 abuts on the front wall of the air chamber 27a. . As a result, the stroke of the piston 26 is substantially shortened, and the amount of elevation of the vertical slide member 22 can be limited. The amount of elevation of the vertical slide member 22 is adjusted so that the upper end surface 22a is located above the position of the lower surface of the turntable 4 (the lower surface of the contact member 4a in FIG. 3) as a base point, and is located in a range of 0 to 5/1000 mm. Is preferred. By setting the position of the upper end surface 22a above the base position, the levelness of the turntable 4 can be maintained against the load applied to the turntable 4 during pressing.

FIG. 6 shows a table support device 2 having the above-described configuration with respect to the arrangement of the press upper die and the warp correcting upper die.
0 shows an array. In the figure, position B is the arrangement of the upper die 7 for pressing, and positions C, D, and E are the arrangement of three upper dies 9 for correcting warpage. As is apparent from this figure, in the present embodiment, the four table support devices 20 are provided, but their positions need not necessarily be located immediately below each upper die. Also, the number does not need to correspond to the number of upper dies. Generally, the first press in which a glass cob is pressed into a disk shape is subjected to the largest load, and a high levelness of the upper and lower dies is required. Therefore, at least the table bearing device 20 may be installed near the position A of the upper die for press.

Next, the operation timing of the table support device will be described. In the manufacturing apparatus 1, the molten glass supplied onto the lower mold 6 is sequentially conveyed to a pressing step, a three-step warpage correcting step, and an unloading step by the unloading device 2 by rotating the turntable 4, where the molten glass is processed. Receive. In each step, the molten glass needs to be stopped for processing, so that the turntable 4 is intermittently rotated. In the present embodiment, 16 lower dies 6a to 6p are provided on the turntable 4, so that the turntable 4 is controlled to make one rotation in 16 steps. The table support device 20 is operated in synchronization with the intermittent rotation of the turntable 4. That is, during the rotation of the turntable, the vertical slide member 22 of the table support device 20 is retracted and separated from the turntable so as not to cause a resistance to the rotation. Also, when the turntable is stopped, that is, at the time of pressing by the upper die, the vertical slide member 22 is raised to support the turntable.

FIG. 7 is a flowchart showing the operation timing of the table support device 20. Turntable 4
By the rotation of one step, the molten glass that has undergone the processing in the previous step is supplied to the processing position in the next step (701). That is, the molten glass bumps go to a pressing step (position B in FIG. 2), the pressed glass goes to a first warp correction step (position C in FIG. 2), and the glass after the first warp correction is a second warp. The glass after the second warp correction is supplied to a correction step (position D in the same figure) and a third warp correction step (position E in the same figure). When the rotation of the turntable 4 for one step is completed, the stop of the turntable 4 is controlled (70).
2). When the stop of the turntable 4 is detected, the air supply source 25 of the table support device 20 is activated, and the vertical slide member 22 is raised to support the turntable 4 (703). In this state, the press upper die 7 and the three warp correcting upper dies 9 are lowered, and press and warp correction are performed on the glass on the lower die 6 at each process position (704). When the above-described glass pressing process is completed, the table support device 20 retreats the vertical slide member 22 and returns to the standby position (705). When the table support device 20 is released from the turntable 4, the turntable 4 is again driven to rotate one step, and the molten glass on each lower mold is supplied to the next process (706). Thereafter, the above steps are sequentially repeated. In one embodiment, the stop time of the turntable, that is, the time required from step 702 to step 706 is about 2.5 seconds. As is apparent from the above process, during the glass pressing, the table support device 20 supports the turntable 4 from below, thereby avoiding the problem of the deformation and inclination of the turntable 4 due to the load given by the upper die.

In the above steps 702 to 703, the control for detecting the stop of the turntable 4 and activating the table support device 20 can be realized by an arbitrary control device. A rotary encoder that reads the rotation angle of the output shaft of the drive device 3 of the turntable 4 is provided, and the start of the table support device 20 can be controlled from the output pulse. In the above steps 704 to 705, the control of detecting the completion of the press and releasing the table support device 20 can also be realized by an arbitrary control device. The positions of the upper dies 7 and 9 may be detected by a position sensor, and the table support device 20 may be released based on the detection signal, or may be detected by a pressure sensor or the like provided in the table support device 20. Is also good. Further, the table support device 20 is driven by a timer, and after a predetermined time elapses after the activation, the table support device 20 is driven.
May be released. The above steps 705 to 70
In 6, the control for detecting the release of the table support device 20 and rotating the turntable can also be realized by the same control device as described above.

The embodiment of the present invention has been described in detail with reference to the drawings. However, it is obvious that the scope of the present invention is not limited to the matters described in the above embodiment, and is determined based on the description in the claims.
In the present invention, the table support means may be configured to press the turntable upward at the time of pressing and to be separated from the turntable at the time of rotation of the turntable. Not limited. For example, the present invention can also be realized by adopting a configuration in which a cam surface is formed on the lower surface of the turntable at a position corresponding to the lower die, and a roller provided at the press position is brought into contact with the cam surface. In the above-described embodiment, the manufacturing apparatus for performing the warp correction three times after pressing the molten glass has been described. However, the number of warp corrections is not limited to this, and the manufacturing apparatus does not include such a warp correction process. The present invention can also be applied to

[0032]

As described above, according to the present invention, instantaneous warpage and inclination during pressing of the turntable supporting the lower mold can be minimized. As a result, the positional accuracy between the upper mold and the lower mold, that is, the parallelism of both press faces and the mutual axis are accurately maintained, and the thickness deviation of the glass molded product is minimized.

Further, the table support means according to the present invention comprises:
When the turntable is rotated, the turntable is separated from the table, so that there is little rotational load or wear due to friction.

[Brief description of the drawings]

FIG. 1 is a side view of the appearance of an apparatus showing a glass substrate manufacturing apparatus to which the present invention is applied.

FIG. 2 is a plan view of FIG.

FIG. 3 is a side sectional view of a table support device according to an embodiment of the present invention.

FIG. 4 is a plan view showing a part of the table support device in a cutaway manner.

FIG. 5 is a side view as viewed from an arrow V in FIG. 3; Is shown.

FIG. 6 is a plan view showing the arrangement of the table support device with respect to the arrangement of the upper die for pressing and the upper die for correcting warpage.

FIG. 7 is a flowchart showing the operation timing of the table support device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Manufacturing device 2 Unloading device 3 Drive device 4 Turntable 5 Device frame 6 Lower die 7 Upper die for press 9 Upper die for warp correction 8, 10 Air cylinder 11 Support structure 12, 13 Heating device 20 Table support device 21 Housing Reference Signs List 22 vertical slide member 23 horizontal slide member 24 air cylinder 25 air supply source 26 piston 27 cylinder body 28 flange member

Claims (6)

[Claims] 1. A sheet glass manufacturing apparatus, comprising: a turntable rotatably supported; a plurality of lower dies arranged along a circumferential direction of the turntable for receiving molten glass; At least one upper mold that is arranged to face the lower mold on the movement path, moves toward the lower mold and implements the pressing of the molten glass with the lower mold, and a press position of the molten glass. An apparatus for manufacturing sheet glass, comprising: at least one table supporting means installed near the turntable below the turntable and pressing the turntable upward against the pressing force of the upper die during the pressing. 2. The sheet glass manufacturing apparatus according to claim 1, wherein said table support means is separated from said turntable when said turntable rotates. 3. The apparatus for manufacturing a sheet glass according to claim 1, wherein said table support means presses a peripheral portion on a lower surface of said turntable. 4. The turntable is intermittently driven to rotate, and the table support is driven in synchronization with the intermittent drive.
The sheet glass manufacturing apparatus according to the above. 5. The table support means is vertically movably supported, and has a pressing surface against the turntable, and a downward first surface having a predetermined angle with respect to a horizontal plane.
A load receiving member having an inclined surface, and a load receiving member supported movably in a substantially horizontal direction, having a second upwardly inclined surface in surface contact with the first inclined surface and inclined in the moving direction. The plate glass manufacturing apparatus according to claim 1, further comprising: a driving member for driving the driving member; and a power source for driving the driving member. 6. An upper mold supported by a plurality of lower molds arranged along the circumferential direction of the turntable to receive the molten glass and supported on the moving path of the lower mold so as to face the lower mold. In the method of manufacturing a sheet glass for moving toward the lower mold and pressing the molten glass with the lower mold, the turntable is moved upward against the pressing force of the upper mold during the pressing. A method for manufacturing a sheet glass, wherein the pressing force is released from the turntable when the turntable is rotated.