JP2017109881A - Production device of sheet glass, production method of sheet glass and transport device of sheet glass - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a production method and a transport device of a sheet glass, which accurately adjust positional deviation of a cantilever roller arranged in a furnace in high temperature condition.SOLUTION: In the production device of the sheet glass G equipped with a slow cooling device for slowly cooling the sheet glass G while transporting it to a predetermined direction A by the transport device in a slow cooling furnace 7, the transport device includes a pair of cantilever rollers 10 each provided on both ends in a width direction of the sheet glass G, and a position adjusting mechanism 16 for adjusting a position of the cantilever roller 10. The cantilever roller 10 has a rotation axis 13 extending to inside and outside of the slow cooling furnace 7, and the rotation axis 13 has an inner space 13a with inner end of the slow cooling furnace 7 being a closed end 13b, the opposite end being an open end 13c. The position adjusting mechanism 16 has a mark 17 for indicating an axis center of a rotation axis 13 provided in the inner space 13a, and a scope 21 by which the mark 17 is observed through the inner space 13a from outside of the slow cooling surface 7.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a sheet glass manufacturing apparatus and a sheet glass manufacturing method, and more particularly to conveyance of a sheet glass in a manufacturing process.

  As well known in the art, glass plates for flat panel displays (FPD) such as liquid crystal displays, plasma displays, and organic EL displays, and glass plates used in various fields as represented by cover glasses for organic EL lighting. May require strict product quality against surface defects and waviness.

  As a method for producing such a high-quality plate glass, for example, an overflow down draw method is often used.

  In the overflow down draw method, molten glass overflows from the upper part of the molded body inside the molding furnace, and is continuously called plate glass (glass ribbon) from the overflowed molten glass at the lower part of the molded body. ) And a step of slowly cooling the formed glass sheet inside the slow cooling furnace. Inside the slow cooling furnace, the plate glass is conveyed downward by the conveying device.

  The conveying device is configured to convey each of both ends in the width direction of the long plate glass while being sandwiched between a pair of rollers. In general, a plurality of pairs of rollers are arranged at intervals in the vertical direction for each of both ends in the width direction of the plate glass. As each roller, for example, as disclosed in Patent Document 1, a so-called cantilever roller that is cantilevered on a rotating shaft is often used.

Japanese Patent Laid-Open No. 5-124826

  By the way, in the case of a conveyance device using a cantilever roller, the side that contacts the plate glass is the free end side of the cantilever roller. Therefore, the cantilever roller is likely to be displaced, and the contact state between the cantilever roller and the plate glass may become unstable.

  Therefore, it is desired to accurately adjust the positional deviation of the cantilever roller, but there are the following problems. That is, since the plate glass is still in a high temperature state inside the slow cooling furnace, the cantilever roller itself that contacts the plate glass and the ambient temperature are inevitably high. Therefore, inside the slow cooling furnace, the cantilever roller and its surroundings are very dazzling due to red light emission, and it is extremely difficult to observe the exact position of the cantilever roller not only with the naked eye but also with a camera or the like. Therefore, there is a problem that it is impossible to grasp how much the positional deviation has occurred in the cantilever roller, and the positional deviation cannot be adjusted accurately.

  This invention makes it a subject to adjust correctly the position shift of the cantilever roller arrange | positioned in the furnace of a high temperature state.

  The present invention invented to solve the above problems includes a molding apparatus for forming a sheet glass inside a forming furnace, and a slow cooling apparatus for gradually cooling the sheet glass while transporting the sheet glass in a predetermined direction by the transport apparatus inside the slow cooling furnace. In the sheet glass manufacturing apparatus, the conveying device includes cantilever rollers respectively provided at both ends in the width direction of the sheet glass, and a position adjusting mechanism for adjusting the position of the cantilever roller. A rotating shaft extending from the inside to the outside, the rotating shaft has an internal space extending in the axial direction, and the internal space has a closed end on the inner side of the slow cooling furnace and an open end on the outer side of the slow cooling furnace. In addition, the position adjustment mechanism includes a mark provided in the internal space and indicating the axis center of the rotation shaft, and an observation unit that allows the mark to be observed from the outside of the slow cooling furnace through the internal space.

  According to said structure, the mark which shows the axial center of a rotating shaft can be observed through the internal space of the rotating shaft of a cantilever roller from the outside of a slow cooling furnace. Since the internal space of the rotating shaft is not excessively dazzled by the heat inside the slow cooling furnace, the mark can be accurately observed. Therefore, the axis center of the rotation axis can be accurately grasped based on the observed mark. Therefore, even if the inside of the slow cooling furnace is at a high temperature, the positional deviation of the cantilever roller can be adjusted accurately.

  In the above configuration, the observation unit preferably includes a reference device for determining the displacement of the mark position.

  In this way, the positional deviation of the cantilever roller can be determined more reliably and easily.

  In the above configuration, the mark is preferably provided on the closed end side of the internal space (the free end side of the cantilever roller).

  In this way, the mark indicates the position of the axis center on the free end side of the rotating shaft, which is close to the roller portion of the cantilever roller, so that the positional deviation of the cantilever roller can be adjusted with higher accuracy. Can do.

  In the above configuration, the observation unit preferably includes a light source that illuminates the mark from the outside of the slow cooling furnace through the internal space.

  In this way, the mark provided in the internal space of the rotating shaft can be appropriately illuminated by the light source, so that the mark can be easily observed.

  In the above configuration, the position adjustment mechanism includes a movable stage that supports the position of the rotary shaft so that the position of the rotation shaft can be adjusted, and includes a base unit for installing a cantilever roller outside the slow cooling furnace. It may be attached to the base.

  If it does in this way, the rotating shaft of a cantilever roller will be attached to the same base part as an observation part via a movable stage. Therefore, the position reference of the rotation shaft of the cantilever roller and the position reference of the observation unit can be made common to the base part, so that the positional deviation of the cantilever roller can be easily adjusted.

  In the above configuration, it is preferable that the observation unit is detachably attached to the base unit.

  In this way, since the marks in the rotating shafts of a plurality of cantilever rollers can be observed with one observation unit, the number of observation units installed can be reduced.

  The present invention invented in order to solve the above problems includes a forming step of forming a sheet glass inside the forming furnace, and a slow cooling step of gradually cooling the sheet glass while being conveyed in a predetermined direction by a transfer device inside the slow cooling furnace. In the method for producing a sheet glass, the conveying device includes cantilever rollers respectively provided at both ends in the width direction of the sheet glass, the cantilever roller has a rotating shaft extending from the inside of the slow cooling furnace to the outside, The rotating shaft has an internal space extending in the axial direction. The internal space has a closed end on the inner side of the slow cooling furnace and an open end on the outer side of the slow cooling furnace, and adjusts the position of the cantilever roller in the slow cooling process. For this purpose, a mark indicating the axis center of the rotating shaft is provided in the internal space, and the mark is observed from the outside of the slow cooling furnace through the internal space.

  According to such a structure, the same effect as the corresponding structure already described can be enjoyed.

  The present invention devised to solve the above-mentioned problems is a sheet glass conveying device comprising a cantilever roller for supporting the width direction end of the sheet glass and a position adjusting mechanism for adjusting the position of the cantilever roller. The cantilever roller has a rotation shaft, the rotation shaft has an internal space extending in the axial direction, and the internal space has a closed end on the free end side of the cantilever roller and a holding end of the cantilever roller The position adjustment mechanism includes a mark that is provided in the internal space and indicates the axis center of the rotation axis, and an observation unit that allows the mark to be observed through the internal space.

  According to such a structure, the same effect as the corresponding structure already described can be enjoyed.

  As described above, according to the present invention, it is possible to accurately adjust the positional deviation of the cantilever roller disposed inside the furnace in a high temperature state.

It is a longitudinal cross-sectional view of the manufacturing apparatus of the plate glass which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view of the direction orthogonal to FIG. 1 of the manufacturing apparatus of the plate glass which concerns on one Embodiment of this invention. It is SS sectional drawing of FIG. It is a principal part enlarged view which expands and shows the periphery of the cantilever roller arrange | positioned at the slow cooling furnace of FIG. FIGS. 5A and 5B are diagrams showing an example of observation by the scope of FIG. 4, in which FIG. 4A shows a case where the cantilever roller is displaced and FIG. 4B shows a case where the cantilever roller is not displaced. It is a figure for demonstrating the state of the cantilever roller of FIG. 3 at the time of the shaping | molding start of plate glass, Comprising: (a) The state before pinching glass plate, (b) The state after pinching glass plate is shown, respectively. It is a longitudinal cross-sectional view which shows the modification of the manufacturing apparatus of the plate glass which concerns on one Embodiment of this invention.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1, the manufacturing apparatus of the plate glass which concerns on one Embodiment of this invention shape | molds the plate glass G from the molten glass Gm by what is called an overflow down draw method. Specifically, this manufacturing apparatus includes a forming apparatus 1 for forming the sheet glass G from the molten glass Gm, a slow cooling apparatus 2 for gradually cooling (annealing) the sheet glass G, and a cooling apparatus 3 for cooling the sheet glass G to near room temperature. And a conveying device 4 that conveys the plate glass G along a predetermined conveying direction A. Here, in this embodiment, the conveyance direction A is downward (preferably vertically downward).

  The molding apparatus 1 has a molded body 6 having a substantially wedge-shaped outer surface shape in the internal space 5a of the molding furnace 5, and the molten glass Gm is fed to the molded body 6 by supplying the molten glass Gm to the molded body 6. 6 overflows from the top 6a. The overflowing molten glass Gm is joined at the lower end along both side surfaces 6b having a cross-sectional wedge shape of the molded body 6, whereby the glass sheet G is formed from the molten glass Gm.

  The slow cooling device 2 mainly has a slow cooling furnace 7 and is provided below the molding device 1. The internal space 7a of the slow cooling furnace 7 has a predetermined temperature gradient along the conveyance direction A of the glass sheet G, and the temperature decreases as the glass sheet G passing through the internal space 7a moves downstream in the conveyance direction A. Slow cooling allows internal strain to be removed. The temperature gradient of the internal space 7a can be appropriately set by a temperature adjusting device such as a heating device provided on the inner surface of the slow cooling furnace 7, although not shown.

  The cooling device 3 mainly has a cooling furnace 8 and is provided below the slow cooling device 2. In the illustrated example, the internal space 8a of the cooling furnace 8 is wider than the internal space 7a of the slow cooling furnace 7 when viewed in the thickness direction of the glass sheet G, but is not limited thereto. That is, when viewed in the thickness direction of the plate glass G, the internal space 8a of the cooling furnace 8 and the internal space 7a of the slow cooling furnace 7 may be the same size. Note that the glass sheet G may be released to the atmosphere below the slow cooling furnace 7 and the cooling furnace 8 may be omitted.

  As shown in FIG. 2, the transport device 4 includes a plurality of cantilever rollers 9, 10, and 11. The plurality of cantilever rollers 9, 10, 11 are arranged in the internal space 5 a of the molding furnace 5, the internal space 7 a of the slow cooling furnace 7, and the internal space 8 a of the cooling furnace 8, respectively.

  The rotating shaft 12 of the cantilever roller 9 passes through the wall portion of the molding furnace 5 and is disposed over the inside and outside of the molding furnace 5. The rotating shaft 13 of the cantilever roller 10 passes through the wall portion of the slow cooling furnace 7 and is disposed over the inside and outside of the slow cooling furnace 7. The rotating shaft 14 of the cantilever roller 11 passes through the wall portion of the cooling furnace 8 and is disposed inside and outside the cooling furnace 8.

  Among these, the cantilever roller 10 arrange | positioned in the internal space 7a of the slow cooling furnace 7 makes a set of four pieces arrange | positioned on the both surfaces side of the plate glass G, and the width direction B, for example, as shown in FIG. It is arranged at a plurality of locations along the conveyance direction A of G. And the width direction edge part of the plate glass G is clamped with a pair of cantilever rollers 10 which oppose through the plate glass G among a set of cantilever rollers 10. FIG. Here, the pair of cantilever rollers 10 may include one that does not sandwich the end portion in the width direction of the glass sheet G during the slow cooling. That is, the facing distance between the pair of cantilever rollers 10 may be larger than the plate thickness of the end portion in the width direction of the sheet glass G so that the sheet glass G passes between the pair of cantilever rollers 10.

  Here, as shown in the drawing, the end portion in the width direction of the plate glass G has a plate thickness larger than that in the center portion in the width direction of the plate glass G to be the product portion due to shrinkage or the like.

  In addition, the cantilever roller 9 of the forming furnace 5 is a cooling roller that cools the end portion in the width direction of the plate glass G. The cantilever roller 9 of the slow cooling furnace 7 is that the cantilever roller 9 of the forming furnace 5 and the cantilever roller 11 of the cooling furnace 8 are arranged as a set of four disposed on both sides of the sheet glass G and both sides in the width direction B. 10 and in common.

  As shown in FIG. 4, the rotating shaft 13 of the cantilever roller 10 disposed in the internal space 7a of the slow cooling furnace 7 has a free end at the end of the slow cooling furnace 7 to which the cantilever roller 10 is fixed. The opposite end is the holding end supported by the bearing 15 in the external space 7 b of the slow cooling furnace 7. In FIG. 4, the peripheral configuration of one cantilever roller 10 is shown, but the peripheral structure of the other cantilever rollers 10 is the same.

  The rotating shaft 13 is a hollow shaft having an internal space 13a extending along the axial direction. The internal space 13a is defined by the inner peripheral surface of the rotating shaft 13 having a cylindrical surface, the inner space 7a side (free end side) of the slow cooling furnace 7 is a closed end 13b, and the outer space 7b side of the slow cooling furnace 7 is open. This is the end 13c. Thereby, the internal space 13 a of the rotating shaft 13 is shielded from the internal space 7 a of the slow cooling furnace 7.

  In addition, although the illustration is abbreviate | omitted in the external space 7b of the slow cooling furnace 7, the rotating shaft 13 is provided with rotational driving force from drive parts, such as a motor, via a gear etc. Moreover, although the illustration of the gap between the rotary shaft 13 and the furnace wall of the slow cooling furnace 7 is omitted, it is closed by, for example, a heat-resistant elastic member (heat-resistant cloth or the like).

  The conveying device 4 includes a position adjusting mechanism 16 that adjusts the position of the cantilever roller 10 of the slow cooling furnace 7 as a characteristic configuration.

  The position adjusting mechanism 16 includes a mark 17 indicating the center of the rotating shaft 13, an observation unit 18 that can observe the mark 17, and a movable stage 19 for adjusting the position of the rotating shaft 13.

  The mark 17 is disposed in the internal space 13 a of the rotation shaft 13. In this state, the mark 17 is provided with a center point 17a at a position corresponding to the axis center of the rotating shaft 13 (see FIG. 5). The configuration of the mark 17 is not limited to this as long as the center of the rotating shaft 13 can be detected. For example, the mark 17 may be formed by a groove dug in the inner wall of the rotating shaft 13, may be formed by a protruding member attached to the inner wall of the rotating shaft 13, or may be formed on the inner wall of the rotating shaft 13. You may comprise by drawing with a paint.

  The arrangement position of the mark 17 may be any position in the axial direction of the internal space 13a of the rotary shaft 13, but is preferably a portion located in the internal space 7a of the slow cooling furnace 7 in the internal space 13a. Most preferably, it is the closed end 13b or its vicinity.

  The observation unit 18 includes a light source 20 made of light, laser, or the like, a scope 21, and a half mirror 22 in the external space 7 b of the slow cooling furnace 7. The light source 20, the scope 21, and the half mirror 22 are incorporated in the observation unit 18 as one unit. As the light source 20, a laser with high directivity of light is suitable.

  The observation part 18 is attached to a base part 23 extending in the horizontal direction from the outer wall part of the slow cooling furnace 7. The observation part 18 may be provided in all the positions corresponding to each cantilever roller 10, and when it can be attached to and detached from the base part 23, the observation part 18 is provided in all positions corresponding to each cantilever roller 10. It may not be provided. That is, in the latter case, a plurality of cantilever rollers 10 can be set as observation targets by sequentially changing the attachment position of one observation unit 18.

  The half mirror 22 is disposed on the optical axes L 1 and L 2 of the light source 20 and the scope 21, and the light irradiated from the light source 20 is irradiated to the mark 17 disposed in the internal space 13 a of the rotating shaft 13 through the half mirror 22. Then, the light reflected by the mark 17 is again observed by the scope 21 through the half mirror 22. In this embodiment, the scope 21 is positioned with respect to the base portion 23 so that the optical axis L2 thereof is oriented horizontally.

  Similar to the observation unit 18, the movable stage 19 is attached to a base unit 23 provided in the slow cooling furnace 7. A bearing 15 that supports the rotation shaft 13 of the cantilever roller 10 is placed on the movable stage 19. In this embodiment, a movable stage 19 corresponding to a pair of cantilever rollers 10 facing each other with a plate glass G is attached to a common base portion 23.

  The movable stage 19 includes a first stage 24 that can move in the X and Y directions, a second stage 25 that can move in the Z direction, and a third stage 26 that can tilt in the R direction. Here, the X direction and the Y direction are horizontal, the Z direction is vertical, and the directions are orthogonal to each other.

  By the first stage 24 and the second stage 25, the position of the rotary shaft 13, that is, the cantilever roller 10 in the horizontal plane and the vertical plane can be adjusted.

  The third stage 26 includes a tilt base 26a, a fixed base 26b, and a connecting portion 26c. The tilt base 26a is attached to the fixed base 26b via the connecting portion 26c, and the tilt angle of the cantilever roller 10 with respect to the horizontal plane can be adjusted by tilting the tilt base 26a around the connecting portion 26c. Yes.

  The configuration of the movable stage 19 is not particularly limited, and may be configured by one or two stages among the first stage 24, the second stage 25, and the third stage 26. The movable stage 19 may include a stage that can rotate in a horizontal plane.

  Next, an example of the manufacturing method of the plate glass using the plate glass manufacturing apparatus of the said structure is demonstrated.

  First, molten glass Gm is supplied to the molded body 6 in the molding furnace 5 of the molding apparatus 1. As a result, as shown in FIG. 1, the molten glass Gm overflows from the top 6a of the molded body 6 and passes through both side surfaces 6b of the molded body 6 and joins at the lower end, so that the molten glass Gm forms a belt-like plate glass G. (Molding process).

  The sheet glass G molded by the molding apparatus 1 flows down as it is, and reaches the slow cooling furnace 7 of the slow cooling apparatus 2 located below the molding apparatus 1. And the glass sheet G is gradually cooled while progressing along the conveyance direction A in the internal space 7a of the slow cooling furnace 7, and the residual distortion is removed (slow cooling process).

  During the slow cooling process, as shown in FIG. 4, the position adjustment mechanism 16 adjusts the position of the cantilever roller 10 and corrects the positional deviation of the cantilever roller 10. The position adjustment of the cantilever roller 10 by the position adjustment mechanism 16 may be performed continuously during the slow cooling process, or may be performed intermittently (periodically or when trouble occurs).

  Specifically, the observation unit 18 observes the mark 17 provided in the internal space 13 a of the rotation shaft 13 of the cantilever roller 10. The observation by the observation unit 18 is performed by observing the mark 17 with the scope 21 through the internal space 13a of the rotary shaft 13 while illuminating the mark 17 with the light source 20 through the internal space 13a of the rotary shaft 13.

  As shown in FIGS. 5A and 5B, the scope 21 is provided with a reticle 27 as a reference device for determining the displacement of the mark position. The center 27a of the reticle 27 is preliminarily aligned with a reference position where the axis center of the rotating shaft 13 is to be located, for example, when the cantilever roller 10 is in a reference posture with no positional deviation. Therefore, as shown in FIG. 5A, if the center point 17a of the mark 17 indicating the axis center of the rotating shaft 13 is deviated from the reference position, the center 27a of the reticle 27 and the center point 17a of the mark 17 Does not match. In this case, as shown in FIG. 5B, the position of the cantilever roller 10 is adjusted by the movable stage 19 so that the center 27 a of the reticle 27 and the center point 17 a of the mark 17 coincide with each other. Thereby, the position shift of the cantilever roller 10 is corrected.

  Thus, when correcting the positional deviation of the cantilever roller 10, the internal space 13 a of the rotating shaft 13 is shielded from the internal space 7 a of the slow cooling furnace 7. Therefore, since the internal space 13a of the rotating shaft 13 is not excessively dazzled by the heat of the internal space 13a of the slow cooling furnace 7, the center point 17a of the mark 17 can be accurately observed with the naked eye by the scope 21. Therefore, even if the internal space 7a of the slow cooling furnace 7 is at a high temperature, the positional deviation of the cantilever roller 10 can be accurately adjusted based on the observed center point 17a of the mark 17.

  A scale or the like may be provided on at least one of the reticle 27 and the mark 17. According to such a configuration, the position of the cantilever roller 10 can be easily adjusted by measuring the shift amount and the adjustment amount in advance in association with the scale.

  The slowly cooled plate glass G flows down below the slow cooling furnace 7 and reaches into the cooling furnace 8 of the cooling device 3 located further below the slow cooling apparatus 2. And the plate glass G is cooled to room temperature vicinity, advancing along the conveyance direction A through the internal space 8a of the cooling furnace 8 (cooling process). And the cooled plate glass G is cut | disconnected by predetermined length outside the cooling furnace 8, or is wound up in roll shape.

  Here, when the forming of the glass sheet G is started, the facing interval between the pair of cantilever rollers 9, 10, and 11 is set in advance larger than that of the glass sheet G, and the glass sheet G is allowed to pass therebetween. And in the stage where shaping | molding of the plate glass G was stabilized, with respect to one cantilever roller 9,10,11 (fixed side) among a pair of cantilever rollers 9,10,11, the other cantilever roller 9, 10, 11 (moving side) is brought closer. Thus, the edge part of the width direction of the plate glass G is clamped.

  The details of the operation associated with this clamping will be described as follows by taking a pair of cantilever rollers 10 disposed in the slow cooling furnace 7 as an example. That is, as shown in FIG. 6A, the fixed-side cantilever roller 10x slightly pushes the width direction end of the glass sheet G toward the movable-side cantilever roller 10y side. Place. Accordingly, the end in the width direction of the glass sheet G that comes into contact with the fixed-side cantilever roller 10x is slightly bent toward the movable-side cantilever roller 10y. In this state, the rotating shaft 13y of the moving cantilever roller 10y is moved in the C direction so that the moving cantilever roller 10y approaches the fixed cantilever roller 10x side, and FIG. As shown, the end portions in the width direction of the glass sheet G are sandwiched between the cantilever rollers 10x and 10y. At this time, the fixed-side cantilever roller 10x is pushed by the moving-side cantilever roller 10y through the plate glass G. As a result, the fixed-side cantilever roller 10x slightly moves away from the moving-side cantilever roller 10y. This movement of the cantilever roller 10x is caused by a slight warp inevitably generated on the rotating shaft 13x, or a backlash of a machine such as the bearing 15 or the movable stage 19 that supports the rotating shaft 13x. Accordingly, the glass sheet G can be firmly held by the cantilever rollers 10x and 10y while absorbing the displacement due to the warp of the rotating shaft 13y or the backlash of the machine. Further, since the fixed-side cantilever roller 10x moves in a direction away from the moving-side cantilever roller 10y in the sandwiched state, the bending of the end portion in the width direction of the plate glass G that has occurred before the sandwiching is also eliminated. .

  In addition, the code | symbol M of FIG. 6 (a) and (b) shows the centerline of the plate | board thickness of the width direction center part of the plate glass G. FIG. The location of the center line M does not substantially move before and after the plate glass G is sandwiched between the cantilever rollers 10x and 10y.

  As mentioned above, although one Embodiment of this invention was described, naturally the manufacturing apparatus thru | or the manufacturing method of the plate glass mentioned above can take arbitrary forms within the scope of the present invention.

  For example, in the above-described embodiment, the case where the rotating shaft 13 of the cantilever roller 10 disposed in the slow cooling furnace 7 is horizontal in the reference posture is illustrated, but as illustrated in FIG. 6, the cantilever roller 10 is disposed in the slow cooling furnace 7. The rotating shaft 13 of the cantilever roller 10 may be inclined in the transport direction A with respect to the width direction B of the glass sheet G on the closed end 13b (free end) side in the reference posture. In this case, the scope 21 may also be arranged in an inclined state in the transport direction A, and the center 27a of the reticle 27 of the scope 21 may be aligned with the reference position of the rotary shaft 13, but the reticle 27 of the scope 21 If the tilt angle can be measured, the scope 21 may be placed in a state where it is horizontally oriented. As described above, when the rotating shaft 13 of the cantilever roller 10 is tilted, the sheet glass G that is not yet solidified during the slow cooling is pulled outward in the width direction B, and the contraction of the sheet glass G in the width direction B is suppressed. It is considered effective.

  In the above-described embodiment, the case where the positional deviation of the cantilever roller 10 can be detected based on the positional relationship between the mark 17 and the reticle 27 has been described. However, the positional deviation is detected using a reference device other than the reticle 27. It may be detectable. For example, when a laser pointer is used as the light source 20, the laser pointer can be used as a reference device. Specifically, if the irradiation point of the laser pointer is arranged in advance so as to coincide with the center of the mark 17 when the cantilever roller 10 is in a reference posture without positional deviation, the position between the irradiation point and the mark 17 is determined. The positional deviation of the cantilever roller 10 can be detected based on the deviation.

  In the above-described embodiment, the case where the scope 21 is used as the observation unit 18 has been described. However, a camera (image reading apparatus) may be used instead of the scope 21. When a camera is used, the camera may be provided with a zoom function in order to enlarge the mark 17. Alternatively, the mark 17 captured by the camera may be image-analyzed by a personal computer (image processing apparatus), and the position of the axis center of the rotation shaft 13 may be automatically detected. At this time, instead of detecting the center of the rotation axis 13 from the center point 17a of the mark 17, the entire mark 17 imaged by the camera is subjected to image analysis, and the rotation axis 13 is determined from the center of gravity of the mark 17 obtained by the image analysis. The center of the axis may be detected. Furthermore, the movable stage 19 may be automatically moved based on the detected position of the axis center of the rotating shaft 13. If it does in this way, position shift of cantilever roller 10 can be corrected automatically.

  In the above-described embodiment, the case where the position adjusting mechanism 16 is provided on the cantilever roller 10 of the slow cooling furnace 7 has been described. However, the position adjusting mechanism 16 is provided on the cantilever roller 9 of the molding furnace 5 or the cantilever roller of the cooling furnace 8. 11 may be provided.

  Further, in the above-described embodiment, the case where the glass sheet G is formed by the overflow downdraw method as the forming device 1 has been described. However, the forming device 1 may be another downdraw method such as a redraw method or a slot downdraw method, The glass sheet G may be formed by the float process. When the glass sheet G is formed by the float method, the position adjusting mechanism 16 is provided on a cantilever roller (so-called top roll) disposed above the tin bath.

DESCRIPTION OF SYMBOLS 1 Molding device 2 Slow cooling device 3 Cooling device 4 Conveying device 5 Molding furnace 6 Molded body 7 Slow cooling furnace 8 Cooling furnace 9, 10, 11 Cantilever rollers 12, 13, 14 Rotating shaft 14 Cooling furnace 15 Bearing 16 Position adjustment mechanism 17 Mark 18 Observation unit 19 Movable stage 20 Light source 21 Scope 22 Half mirror 23 Base unit

Claims (8)

In a sheet glass manufacturing apparatus comprising: a forming apparatus that forms sheet glass inside a forming furnace; and a slow cooling apparatus that gradually cools the sheet glass while transporting the plate glass in a predetermined direction by a transport apparatus inside the slow cooling furnace.
The transport device includes cantilever rollers respectively provided at both ends in the width direction of the plate glass, and a position adjusting mechanism for adjusting the position of the cantilever roller,
The cantilever roller has a rotating shaft extending from the inside of the slow cooling furnace to the outside,
The rotating shaft has an internal space extending in the axial direction;
In the internal space, the inner side of the slow cooling furnace is a closed end, and the outer side of the slow cooling furnace is an open end,
The position adjustment mechanism is
A mark provided in the internal space and indicating the center of the rotation axis;
An apparatus for producing plate glass, comprising: an observation unit that enables observation of the mark through the internal space.   The said observation part is provided with the reference | standard device for discriminating the displacement of the position of the said mark, The manufacturing apparatus of the plate glass of Claim 1 characterized by the above-mentioned.   The said mark is provided in the said closed end side of the said interior space, The manufacturing apparatus of the plate glass of Claim 1 or 2 characterized by the above-mentioned.   The said observation part is equipped with the light source which illuminates the said mark through the said internal space from the outside of the said slow cooling furnace, The manufacturing apparatus of the plate glass of any one of Claims 1-3 characterized by the above-mentioned. The position adjustment mechanism includes a movable stage that supports the position of the rotation shaft so as to be adjustable,
Comprising a base for installing the cantilever roller outside the slow cooling furnace,
The said movable stage and the said observation part are attached to the said base part, The manufacturing apparatus of the plate glass of any one of Claims 1-4 characterized by the above-mentioned.   The said observation part is attached to the said base part so that attachment or detachment is possible, The manufacturing apparatus of the plate glass of Claim 5 characterized by the above-mentioned. In a method for producing a sheet glass comprising a forming step of forming a sheet glass inside a forming furnace, and a slow cooling step of gradually cooling the sheet glass while transporting it in a predetermined direction by a transport device inside the slow cooling furnace,
The transport device includes cantilever rollers provided at both ends in the width direction of the plate glass,
The cantilever roller has a rotating shaft extending from the inside of the slow cooling furnace to the outside,
The rotating shaft has an internal space extending in the axial direction;
In the internal space, the inner side of the slow cooling furnace is a closed end, and the outer side of the slow cooling furnace is an open end,
In the slow cooling step, in order to adjust the position of the cantilever roller, a mark indicating the center of the rotating shaft is provided in the internal space, and the mark is observed from the outside of the slow cooling furnace through the internal space. The manufacturing method of the plate glass characterized by these. A sheet glass conveying device comprising a cantilever roller for supporting a width direction end of the sheet glass, and a position adjusting mechanism for adjusting the position of the cantilever roller,
The cantilever roller has a rotating shaft,
The rotating shaft has an internal space extending in the axial direction;
In the internal space, the free end side of the cantilever roller is a closed end, and the holding end side of the cantilever roller is an open end,
The position adjusting mechanism includes a mark provided in the internal space and indicating a center of the axis of the rotation shaft, and an observation unit that enables observation of the mark through the internal space. .

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