TW201829326A - Method for producing sheet glass, and device for producing sheet glass - Google Patents

Abstract

This method for producing a sheet glass is provided with: a step in which a portion of a molten glass GM is dropped from a moulded body 4 as a glass lump GL at the time continuous production of the sheet glass GR is started; and a step in which the separation distance D1 of first rollers 10 in the width direction X of the moulded body 4 is set so as to be smaller than a separation distance D2 of second rollers 11 in the width direction X of the moulded body 4, so that the glass lump GL is held by the first rollers 10.

Description

Plate glass manufacturing method and plate glass manufacturing device

[0001] The present invention relates to a method and apparatus for producing sheet glass from molten glass.

[0002] As is well known, glass substrates for flat panel displays (FPDs) such as liquid crystal displays (LCDs), plasma display devices (PDPs), and organic EL displays (OLEDs) are representative of panel glass used in various fields. It is actually demanding strict product quality for surface defects, corrugations, etc. [0003] In order to satisfy such a demand, a down-draw method is generally used in the method of manufacturing a sheet glass. In terms of this pull-down method, it is known that the overflow down-draw method, the flow-down method, and the like. [0004] The overflow down-draw method is a method in which molten glass is poured into an overflow groove provided in an upper portion of a substantially wedge-shaped molded body, and molten glass overflowing from both sides of the overflow groove is formed along the molded body. The side walls of the both sides are flowed down, and the lower end portions of the molded body are integrated and integrated, and one sheet glass is continuously formed. In addition, the orifice down-draw method is such that a slit-shaped opening is formed in the bottom wall of the molded body to which the molten glass is supplied, and the molten glass flows down through the opening to continuously form one sheet glass. [0005] In particular, the overflow down-draw method is formed by forming the front and back surfaces of the formed sheet glass without being in contact with any portion of the molded body during the forming process, so that the flatness is excellent and there is no flaw such as scratches. Flame polished surface. [0006] For example, in the sheet glass manufacturing apparatus using the overflow down-draw method, as disclosed in Patent Document 1, there is a forming furnace having a molded body therein, and an annealing furnace installed below the forming furnace. a cooling portion and a cutting portion below the annealing furnace. The plate glass manufacturing apparatus is configured to: melt the glass from the top of the molded body while merging at the lower end portion thereof to form the sheet glass (glass ribbon), and remove the internal deformation of the sheet glass through the annealing furnace. After the cooling portion is cooled to room temperature, the cut portion is cut into a predetermined size. In the annealing furnace, a plurality of upper and lower rollers that are pulled by the sheet glass formed through the molded body are disposed. [Prior Art Document] [Patent Document] [0007] [Patent Document 1] Japanese Patent Laid-Open Publication No. 2012-197185

[Problems to be Solved by the Invention] In the preparation stage in the molding process under the forming furnace, the molten glass that has overflowed from the molded body is formed into a block shape at the lower end portion of the molded body (hereinafter referred to as "glass" Piece"). When the forming process is started, it is necessary to perform the preparatory work efficiently by stretching the glass block to sandwich the rolls in the annealing furnace. The present invention has been made in view of the above circumstances, and an object of the invention is to provide a sheet glass manufacturing method and a sheet glass manufacturing apparatus which can efficiently perform a preparation operation of a molding process. [Means for Solving the Problem] The present invention has been made to solve the above problems, and the molten glass is flowed down from a molded body to form a sheet glass, and is transmitted through a molded article disposed below the molded body. a set of first rollers separated in the width direction, and rollers of a plurality of upper and lower steps of the second roller disposed under the first roller and separated in the width direction of the molded body, thereby pulling In the method of continuously producing the sheet glass, the sheet glass is provided at the beginning of continuous production of the sheet glass, and has a procedure of dropping a part of the molten glass from the molded body into a glass block; The roller holds the glass block, and the separation distance in the width direction of the first roller is set to be smaller than the separation distance in the width direction of the second roller. [0011] At the start of the production of the sheet glass, that is, at the preparation stage of the molding process, the glass block produced at the lower end portion of the formed body is formed at the center in the width direction of the molded body. In the present method, the separation distance of the first roller in the width direction of the formed body is set to be smaller than the separation distance of the second roller so that the glass block can be surely held by the first roller. The glass block is cooled by being sandwiched by the first roller, and its width is widened and deformed into a plate shape. The portion which is deformed into a plate shape is sandwiched by the lower second roller to further expand its width, and the plate glass having a desired width can be formed. Through such a positional relationship between the first roller and the second roller, the preparation work of the molding process can be performed efficiently. [0012] In the above method for manufacturing a sheet glass, the first roller may have a shaft portion that supports the first roller, and may be configured to be movable in an axial direction of the shaft portion. Accordingly, the first roller is configured to be movable in the axial direction so that the position of the first roller can be adjusted in accordance with the position, size, and the like of the glass block. Therefore, the first roller can securely hold the glass block in an appropriate position. In the above-described method for producing a sheet glass, preferably, the first roller is moved to the end in the width direction of the molded body so as to be at the same position as the second roller after the glass block is sandwiched. The location of the department. Accordingly, the first roller guides the glass block to the second roller side, and the second roller can be used to hold the glass block earlier. Further, preferably, after the second roller sandwiches the end portion of the sheet glass, the first roller is separated from the sheet glass. Through the second roller, the first roller is separated from the plate glass in a state in which the plate glass of a predetermined width is continuously formed, so that the plate glass can be pulled through the second roller without sharply changing the temperature of the plate glass. . [0015] In the above method for manufacturing a sheet glass, the pressure at which the first roller sandwiches the glass block is preferably set to be larger than a pressure at which the second roller sandwiches the sheet glass. Accordingly, the glass block can be surely held by the first roller, and the width of the glass block is appropriately expanded so that a part of the glass block faces the second roller. [0016] In the above method for manufacturing a sheet glass, preferably, the second roller has a shaft portion that supports the second roller, and a length of the shaft portion of the first roller is set to be larger than that of the second roller. The length of the aforementioned shaft portion is long. By thus configuring the shaft portion of the first roller to be long, the range of movement of the first roller in the axial direction can be increased as much as possible. Therefore, the first roller can surely hold the glass block in accordance with the size, position, and the like of the glass block which varies depending on the size of the sheet glass, temperature conditions, and the like. [0017] In the method for producing a sheet glass, preferably, the width of the first roller is set to be larger than a width of the second roller. Accordingly, the first roller can securely hold the glass block. Furthermore, the first roller, which has the ability to cool the glass block, can be made to effectively expand the held glass block in the direction of the second roller. [0018] The present invention is directed to a sheet glass manufacturing apparatus, comprising: a molded body in which a part of molten glass is dropped into a glass block and the molten glass is formed into a sheet glass; a roller that pulls up and down the plurality of steps of the plate glass, and the roller includes a first roller disposed under the molded body and separated in the width direction of the molded body, and disposed on the first roller a set of second rollers which are separated from the first roller and which are separated in the width direction of the molded body, and have a separation in the width direction of the first roller in order to sandwich the glass block through the first roller The distance is set to be smaller than the separation distance in the width direction of the second roller described above. [0019] In the preparation stage of the molding process, the glass block produced at the lower end portion of the molded body is formed at the center in the width direction of the molded body. In the above-described sheet glass manufacturing apparatus, the separation distance of the first roller in the width direction of the molded body is set to be smaller than the separation distance of the second roller so that the glass block can be surely held by the first roller. The glass block held by the first roller is cooled by the first roller such that its width is gradually stretched and held by the second roller. According to this, the plate glass can be continuously formed while maintaining a predetermined width. By the positional relationship of the first roller and the second roller, the sheet glass manufacturing apparatus can efficiently perform the preparation work of the molding process. [Comparative to the effects of the prior art] [0020] According to the present invention, the preparation work of the molding process can be performed efficiently.

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1 to 9 show an embodiment of a method for producing a sheet glass and a sheet glass manufacturing apparatus according to the present invention. [0023] As shown in FIGS. 1 and 2, the sheet glass manufacturing apparatus 1 mainly includes a forming furnace 2 and an annealing furnace 3 located below the forming furnace 2. In the sheet glass manufacturing apparatus 1, the molten glass GM supplied from the melting furnace provided in the upstream side is formed into the sheet glass GR through the forming furnace 2, and the inside of the sheet glass GR is deformed by the annealing furnace 3. [0024] The forming furnace 2 includes a molded body 4 that performs an overflow down-draw method inside the furnace wall, and an edge roller 5 that is extracted from the molten glass GM that has overflowed from the molded body 4 as the sheet glass GR. [0025] The formed body 4 is configured to be elongated while having an overflow groove 6 formed along the longitudinal direction thereof at the top. Further, the molded body 4 includes a pair of vertical surface portions 7 and inclined surface portions 8 which constitute a side wall portion facing each other. It is formed to connect the inclined surface portion 8 at the lower end portion of the vertical surface portion 7. The pair of inclined surface portions 8 are gradually approached and intersected downward, and constitute the lower end portion 9 of the molded body 4. As shown in FIG. 1, the edge roller 5 is placed directly under the molded body 4, and is sandwiched between the end portions GRa and GRb of the width direction X of the sheet glass GR. A group. Further, as shown in Fig. 2, the edge roller 5 is configured as a pair of rollers, and is juxtaposed in the thickness direction Y of the sheet glass GR so as to sandwich the end portions GRa and GRb of the sheet glass GR in the width direction X. . In the following, the longitudinal direction of the molded body 4 is referred to as "width direction", and the common symbol X is used for the width direction of the molded body 4 and the width direction of the plate glass GR (FIG. 1, FIG. 4, FIG. Figure 7 and Figure 8 refer to). In the forming furnace 2, the molten glass GM flows into the overflow groove 6 of the molded body 4, and the molten glass GM overflowing from the overflow groove 6 to both sides flows down the vertical surface portion 7 and the inclined surface portion 8. One side of the lower end portion 9 is fused and integrated, and one sheet glass GR is continuously formed. Further, the molded body 4 is not limited to the above configuration, and may be configured to perform a flow hole down-draw method. [0028] As shown in FIG. 1 and FIG. 2, the annealing furnace 3 has rollers (annealing rolls) 10 to 13 which are formed in a plurality of stages (the fourth order of the drawing) in the vertical direction. Hereinafter, the plurality of steps 10 to 13 are referred to as the first roller 10 to the fourth roller 13 in order from the top. As shown in Fig. 2, each of the rollers 10 to 13 is configured as a pair of rollers that sandwich the sheet glass GR in the sheet thickness direction Y. In addition, each of the rollers 10 to 13 is sandwiched between the end portions GRa and GRb in the width direction X of the sheet glass GR, and is configured as a right and left group in a front view (see FIG. 1). [0029] Each of the rollers 10 to 13 is provided with a shaft portion 10a to 13a that supports the rollers 10 to 13 individually. Each of the rollers 10 to 13 is a cantilever roller supported at one end portion of each of the shaft portions 10a to 13a. The length L1 of the shaft portion 10a of the first roller 10 is set to be longer than the lengths L2 to L4 of the shaft portions 11a to 13a of the other rollers 11 to 13. The shaft portions 11a to 13a of the second roller 11, the third roller 12, and the fourth roller 13 are configured to have the same length L2 to L4. [0030] As shown in FIG. 3, a cooling device 14 is provided for each of the shaft portions 10a to 13a of each of the rollers 10 to 13. The cooling device 14 is provided with a cooling pipe 15 disposed inside the hollow shaft portions 10a to 13a. The cooling pipe 15 is a port portion 15a that has a cooling medium that discharges air or the like. The cooling medium discharged from the mouth portion 15a is circulated through the shaft portions 10a to 13a, thereby cooling the shaft portions 10a to 13a and the rollers 10 to 13. [0031] Each of the rollers 10 to 13 which are paired in the thickness direction Y of the plate glass GR is configured to be able to change the distance between the axes. Further, each of the rollers 10 to 13 is configured to be movable along the axial direction of the molded body 4 or the sheet glass GR along the axial direction thereof. Hereinafter, the direction from the end portions 4a and 4b of the molded body 4 toward the center portion 4c is referred to as "axial direction inward", and the direction from the central portion 4c toward the end portions 4a, 4b is referred to as "axial direction outward". [0032] The width W1 of the first roller 10 is configured to be larger than the widths W2 to W4 of the other rollers 11 to 13. The width W2 of the second roller 11, the width W3 of the third roller 12, and the width W4 of the fourth roller 13 are configured to be equal. [0033] The first roller 10 is mainly used for a glass block GL formed by sandwiching the molten glass GM overflowing from the molded body 4 in a molding preparation program of the sheet glass GR. When the second roller 11 to the fourth roller 13 are deformed by the first roller 10 and are formed into a plate shape, the second roller 11 to the fourth roller 13 are used to sandwich a part thereof while sandwiching a plate having a predetermined width. End portions GRa, GRb of the width direction X of the glass GR. [0034] Hereinafter, a method of forming the sheet glass GR by the sheet glass manufacturing apparatus 1 having the above configuration (a method of manufacturing a sheet glass) will be described. At the start of the production of the sheet glass GR, it is necessary to perform the operation of preparing the molten glass GM flowing from the molded body 4 by the respective rolls 5, 10 to 13 (preparation work of the molding process). In other words, the molten glass GM supplied from the melting furnace is injected into the overflow groove 6 of the molded body 4, and overflows from the overflow groove 6 and merges along the vertical surface portion 7 and the inclined surface portion 8 at the lower end portion 9. At this time, the left and right set of edge rollers 5 hold a part of the molten glass GM that is to be merged and dropped (downward) (see FIG. 4). Further, in the present invention, when the production of the sheet glass GR is started, the preparation of the forming process of the sheet glass GR is required. For example, after the operation of the sheet glass manufacturing apparatus 1 is once interrupted, the forming of the sheet glass GR is resumed. Case. As shown in FIG. 4, the molten glass GM is formed in the central portion 4c of the molded body 4 in the width direction X to form a glass block GL. This glass block GL is periodically dropped (down) from the formed body 4 a plurality of times. The first roller 10 stands by at the positions of the end portions 4a and 4b of the molded body 4 in the width direction X. In this standby position, the first roller 10 is located at the same position as the other rollers 11 to 13 in the width direction X. Therefore, the separation distance D1 of the first roller 10 is equal to the separation distances D2 to D4 of the other rollers 11 to 13. [0036] When the glass block GL is formed, as shown in FIG. 5, the first roller 10 moves from the standby position toward the position (initial clamping position) of the central portion 4c of the molded body 4 in the width direction X, and is clamped. This glass block GL (using the clamping procedure of the glass block GL under the first roller 10). In this case, as shown in Fig. 6, the first roller 10, which is a pair of rollers, passes through each other (indicated by a chain double-dashed line), thereby sandwiching the glass block GL in the middle of dropping (downward). [0037] Here, since the width of the glass block GL is smaller than the width of the sheet glass GR to be formed later, the first roller 10 is disposed at a position of the central portion 4c of the molded body 4, that is, disposed at a later position. The position of the central portion GRc of the formed sheet glass GR in the width direction X. In other words, the separation distance D1 in the axial direction (width direction X) of the first roller 10 which is the right and left in the front view is smaller than the separation distance D2 to D4 in the axial direction of the left and right groups of the other rollers 11 to 13 (Fig. 5 reference). [0038] The size of the glass block GL varies depending on the size of the sheet glass GR to be formed, temperature conditions, and the like. For this reason, the first roller 10 is adjusted by the movement of the separation distance D1 in the axial direction. The first roller 10, which is paired in the plate thickness direction Y of the plate glass GR, is pressed against the pressure of the glass block GL, and is set to be larger than the pressure of the other rollers 11 to 13 to sandwich the plate glass GR. [0039] The first roller 10 holds the glass block GL to be cooled to expand the width of the glass block GL. In response to the expansion of the glass block GL, the first roller 10 is moved outward in the axial direction from the position of the central portion 4c of the molded body 4 as shown in Fig. 7 . Accordingly, the width of the glass block GL is further expanded. According to this glass block GL, it is close to the second roller 11. [0040] The second roller 11 of the right and left groups is moved inward in the axial direction in order to sandwich a part of the glass block GL. According to this, each of the second rollers 11 is close to each other, and the separation distance D2 becomes small. At this time, the separation distance D2 of the second roller 11 is set to be substantially equal to or larger than the separation distance D1 of the first roller 10. Thereafter, the second roller 11 holds a part of the glass block GL which is expanded by the first roller 10. When the second roller 11 holds a part of the glass block GL, it returns to the original position (the separation distance D2 becomes larger again). By the action of the first roller 10 and the second roller 11, the glass block GL is widened in width and gradually deformed into a plate shape. As a result, the molten glass GM connected to the upstream side (upper side) of the glass block GL is formed into a plate shape while expanding its width. [0041] The glass block GL whose width is further expanded by the second roller 11 reaches the third roller 12. Accordingly, the third roller 12 holds a part of the glass block GL and guides it downward. Thereafter, the fourth roller 13 holds a part of the glass block GL and guides it downward (refer to FIG. 8). In this way, the plate-shaped molten glass GM connected to the glass block GL is further expanded in width by being sandwiched by the second roller 11 to the fourth roller 13, and as a result, the plate glass GR having the desired width is pressed by the second roller. 11 to the fourth roller 13 is pulled (refer to Fig. 1). When the molten glass GM is formed into the sheet glass GR of a predetermined width, the second roller 11 to the fourth roller 13 are sandwiched by the end portions GRa and GRb of the sheet glass GR in the width direction X. In the width direction X (axial direction), it is separated by a certain separation distance D2 to D4 (refer to FIG. 1). In this case, although the separation distances D2 to D4 are set to be equal, the present invention is not limited thereto, and may be set to be different depending on the state of the sheet glass GR. [0043] When the first roller 10 holds the sheet glass GR from the second roller 11 to the fourth roller 13, the clamping of the sheet glass GR is released. That is, as shown in Fig. 9, the pair of first rollers 10 are separated from the plate glass GR by the distance between the axes. Accordingly, the first roller 10 does not come into contact with the sheet glass GR, so the sheet glass GR is not cooled by the first roller 10. Thereafter, the first roller 10 can be moved outward in the axial direction to be further separated from the plate glass GR. In this case, the separation distance D1 of the first roller 10 of the left and right sets is variable larger than the separation distances D2 to D4 of the other rollers 11 to 13. [0044] According to the sheet glass manufacturing apparatus 1 and the sheet glass manufacturing method according to the present embodiment described above, the first roller 10 is formed at the start of the production of the sheet glass GR (during the preparation of the molding process). The lower side of the body 4 is disposed at a position of the central portion 4c of the molded body 4 in the width direction X (the position of the center portion GRc of the sheet glass GR in the width direction), thereby setting the separation distance D1 of the first roller 10 to The separation distance D2 is smaller than the second roller 11. According to this, it is possible to surely hold the glass block GL which is produced in the preparation stage of the forming process. [0045] The glass block GL is cooled by being sandwiched by the first roller 10, and has a widened width while being deformed into a plate shape. The portion which is deformed into a plate shape is sandwiched by the second roller 11 below, thereby further expanding the width of the molten glass GM, so that the sheet glass GR having a desired width can be formed. According to this, the plate glass manufacturing apparatus 1 and the sheet glass manufacturing method can efficiently perform the preparation work of the molding process. Further, the first roller 10 is configured to be movable in the axial direction so that the position of the first roller 10 can be adjusted in accordance with the position, size, and the like of the glass block GL. Therefore, the first roller 10 can surely hold the glass block GL at an appropriate position. Further, the first roller 10 is moved outward in the axial direction so as to be at the same position as the second roller 11 after the glass block GL is clamped. The first roller 10 is moved to the position of the end portions 4a, 4b of the molded body 4 in the width direction X so that the glass block GL can be guided to the side of the second roller 11, and the second roller 11 can be held earlier by the glass block GL. [0047] Further, after the second roller 11 holds the end portions GRa, GRb of the sheet glass GR, the first roller 10 is separated from contact with the sheet glass GR, so that the cooling effect of the first roller 10 can be prevented. Under the plate glass GR, the plate glass GR of uniform thickness is appropriately pulled through the second roller 11 to the fourth roller 13. Further, the pressure at which the first roller 10 holds the glass block GL is set to be larger than the pressure at which the second roller 11 holds the plate glass GR, so that the first roller 10 can surely hold the glass block having a larger thickness than the plate glass GR. GL. Further, the first roller 10 is passed through so that the width of the glass block GL can be appropriately expanded so that a part of the glass block GL faces the second roller 11. Further, by setting the length L1 of the shaft portion 10a of the first roller 10 to be longer than the lengths L2 to L4 of the respective shaft portions 11a to 13a of the second roller 11 to the fourth roller 13, it is possible to increase the number as much as possible. The range of movement of one roller 10 in the axial direction. Further, by shortening the lengths of the shaft portions 11a to 13a of the second roller 11 to the fourth roller 13, the center vibration of the second roller 11 to the fourth roller 13 is minimized, and the sheet glass GR can be appropriately pulled. [0049] The width W1 of the first roller 10 is set to be larger than the widths W2 to W4 of the other rollers 11 to 13, so that the first roller 10 can be surely held by the glass block GL, and the ability to cool the glass block can be improved. Further, the present invention is not limited to the constituents of the above-described embodiments, and is not limited to the above-described effects. The present invention can be variously modified without departing from the spirit and scope of the invention. In the above-described embodiment, the first roller 10 is moved outward in the axial direction after the glass block GL is sandwiched, but the invention is not limited thereto. The first roller 10 can also remain in this position while holding the glass block GL. [0052] In the above-described embodiment, the first roller 10 and the second roller 11 are moved in the axial direction to sandwich the glass block GL. However, the present invention is not limited thereto, and the third embodiment may be used. The roller 12 and the fourth roller 13 move in the axial direction to sandwich the glass block GL.

[0053]

1‧‧‧ Plate glass manufacturing equipment

4‧‧‧ Shaped body

10‧‧‧First Roller

10a‧‧‧The shaft of the first roller

11‧‧‧Second roller

11a‧‧‧Shaft of the second roller

GL‧‧‧ glass block

GM‧‧‧ molten glass

GR‧‧‧ plate glass

L1‧‧‧ Length of the shaft of the first roller

L2‧‧‧ Length of the shaft of the second roller

W1‧‧‧The width of the first roller

W2‧‧‧ width of the second roller

[ Fig. 1] Fig. 1, a front view of a tie glass manufacturing apparatus. Fig. 2 is a side view of a tie glass manufacturing apparatus. Fig. 3 is a cross-sectional view showing a roller and a shaft portion. Fig. 4 is a front elevational view showing a plate glass manufacturing apparatus shown in a procedure for a method of manufacturing a sheet glass. Fig. 5 is a front elevational view showing a plate glass manufacturing apparatus shown in a procedure of a method for manufacturing a sheet glass. Fig. 6 is a side view showing a plate glass manufacturing apparatus shown in a procedure of a method for manufacturing a sheet glass. Fig. 7 is a front elevational view showing a plate glass manufacturing apparatus shown in a procedure for a method of manufacturing a sheet glass. Fig. 8 is a front elevational view showing a plate glass manufacturing apparatus shown in a procedure for a method of manufacturing a sheet glass. Fig. 9 is a side view showing a plate glass manufacturing apparatus shown in a procedure of a method for manufacturing a sheet glass.

Claims (8)

A method for producing a sheet glass, which is formed by forming a sheet glass from a molded body by flowing molten glass, and passing the upper and lower plurality of rolls to pull the sheet glass, thereby continuously manufacturing the sheet glass, wherein the upper and lower plurality of rolls are disposed in the forming a set of first rollers that are separated from each other in the width direction of the molded body, and a second roller that is disposed below the first roller and that is separated in the width direction of the molded body At the beginning of the continuous production of the sheet glass, the method includes: dropping a part of the molten glass from the molded body into a glass block; and inserting the glass block by the first roller, the first roller The separation distance in the width direction is set to be smaller than the separation distance in the width direction of the second roller. The method of manufacturing a sheet glass according to claim 1, wherein the first roller is configured to have a shaft portion that supports the first roller and is movable in an axial direction of the shaft portion. The method for producing a sheet glass according to claim 2, wherein the first roller is moved to an end portion of the molded body in the width direction so as to be at the same position as the second roller after the glass block is sandwiched position. The method for producing a sheet glass according to claim 1 or 2, wherein, after the second roller is sandwiched between the end portions of the sheet glass, the first roller is separated from contact with the sheet glass. The method for producing a sheet glass according to any one of claims 1 to 4, wherein the pressure at which the first roller holds the glass block is set to be larger than a pressure at which the second roller sandwiches the sheet glass. The method of manufacturing a sheet glass according to claim 2 or 3, wherein the second roller has a shaft portion that supports the second roller, and a length of the shaft portion of the first roller is set to be larger than that of the second roller The length of the aforementioned shaft portion is long. The method for producing a sheet glass according to any one of claims 1 to 6, wherein the width of the first roller is set to be larger than a width of the second roller. A sheet glass manufacturing apparatus comprising: a molded body in which a part of the molten glass is suspended as a glass block, and the molten glass is formed into a sheet glass; and a roller disposed below the molded body and pulling the upper and lower steps of the sheet glass; The roller includes a first roller disposed below the molded body and separated in the width direction of the molded body, disposed below the first roller and separated in the width direction of the molded body The second set of the second rolls has a separation distance in the width direction of the first roll set to be larger than the width direction of the second roll in order to sandwich the glass block through the first roller. A structure with a small separation distance.