JP6738557B2 - Sheet glass manufacturing method and manufacturing apparatus thereof - Google Patents

Description

TECHNICAL FIELD The present invention relates to an improvement in a plate glass manufacturing technique including a step of cutting a plate glass along a scribe line.

As is well known, a glass substrate for a flat panel display (FPD) such as a liquid crystal display, a plasma display, an organic EL display, or a cover glass for organic EL lighting is represented by a flat glass used in various fields. The manufacturing process often includes a step of cutting a small area glass plate from a large area glass plate or a step of trimming an edge portion along a side of the glass plate. In such a process, it is customary to form a scribe line on the plate glass and then cut the plate glass along the scribe line.

As a specific example of the method for cleaving plate glass, for example, the method disclosed in Patent Document 1 can be cited. In the method disclosed in the same document, after forming a scribe line on the surface of the plate glass, a plate-shaped fold bar is brought into contact with the surface of the plate glass in the vicinity of the scribe line, and in that state, the plate glass is placed on the back surface side. Push into. By the pushing operation of the split bar, bending stress is applied in the vicinity of the scribe line, and the plate glass is split along the scribe line.

International Publication No. 2014/017577

However, as disclosed in Patent Document 1, when a plate-shaped split bar is pushed in to exert a bending stress, the plate glass may be bent before it is cut. In this case, the surface of the sheet glass is likely to change to a curved surface or the angle of the sheet glass with respect to the split bar is likely to change due to the bending of the sheet glass. Therefore, the contact state between the split bar and the plate glass tends to be unstable. Then, if the split bar is forced in while maintaining such an unstable contact state, sliding occurs between the split bar and the plate glass, and bending stress does not sufficiently act on the plate glass. You may not be able to cut accurately along the line. Such a problem becomes remarkable as the plate glass to be cleaved becomes thin and the bending thereof becomes large.

An object of the present invention is to reliably cut a plate glass along a scribe line by bending stress even when the plate glass is bent.

The present invention devised to solve the above problem includes a cleaving step in which a scribe line is formed on the surface side of the boundary portion between the first region and the second region of the plate glass, and the plate glass is cleaved along the scribe line. In the method for manufacturing a sheet glass, in a cleaving step, while rolling the rolling element along the surface of the second area in a state where the back surface side of the first area is supported by the back surface supporting member, the rolling element rolls the second area to the back surface. It is characterized in that the plate glass is cut along the scribe line by pushing it to the side. According to such a configuration, since the rolling element pushes the sheet glass while rolling along the surface of the second region of the sheet glass, even if the sheet glass bends, the rolling element follows the angle and shape change of the sheet glass. .. Therefore, the contact state between the rolling elements and the plate glass is stable, and undue slippage between the rolling elements and the plate glass is unlikely to occur. Therefore, even when the plate glass is bent, the bending stress sufficiently acts in the vicinity of the scribe line located between the rolling element and the back surface supporting member, and the plate glass can be reliably cut along the scribe line. ..

In the above structure, the plate glass may be suspended and supported in the cleaving process such that the scribe line is oriented in the vertical direction. By doing this, when handling the sheet glass in a vertical posture that is suspended and supported in the upstream process of the cleaving process, the sheet glass can be smoothly conveyed to the cleaving process in the same posture without a large posture change. can do. Further, the sheet glass can be smoothly conveyed to the downstream process while being suspended and supported after being cut. Further, since the suspended and supported flat glass has a vertical posture, the floor area occupied by the flat glass is small, which leads to space saving.

In the above-mentioned structure, it is preferable that the rolling element is in contact with the surface of the second region at positions other than both ends of the glass plate facing each other in the longitudinal direction of the scribe line. By doing so, the rolling element does not directly contact the edge of the glass sheet that is easily damaged, so that it is possible to prevent the glass sheet from being damaged from the edge of the glass sheet as a starting point at a position unrelated to the scribe line.

In the above structure, it is preferable that the scribe line is formed at a position excluding both ends of the glass plate facing each other in the longitudinal direction of the scribe line. In this way, since the scribe line does not extend to the edge of the plate glass that is easily damaged, it is possible to prevent the plate glass from being damaged from the edge of the plate glass as an origin at improper timing such as before cutting. ..

In the above structure, the scribe line is formed at a position excluding both ends of the glass plate facing each other in the longitudinal direction of the scribe line, and the rolling element is within the formation range of the scribe line excluding both ends of the scribe line. It is preferable to contact the surface of the second region only by itself. The inventor of the present application has confirmed that such a configuration makes it possible to more reliably cut the plate glass along the scribe line.

In the above configuration, the rolling element may be a cylindrical roller having a rotation axis along the longitudinal direction of the scribe line. With this configuration, one rolling element can push the long continuous region of the plate glass along the longitudinal direction of the scribe line. Therefore, bending stress can be efficiently applied to the scribe line.

In this case, it is preferable that the roller is divided into a plurality of pieces in the longitudinal direction of the scribe line. This makes it easy to adjust the position and number of rollers when the size of the plate glass to be cleaved is changed.

In the above structure, the plate glass preferably has a thickness of 0.3 mm or less. That is, with such a plate glass, the bending at the time of cleaving becomes large, so that the effect of the present invention is sufficiently exerted.

The present invention, which was devised to solve the above-mentioned problems, was provided with a cleaving device for cleaving a plate glass having a scribe line formed on the surface side of the boundary between the first region and the second region along the scribe line. In the sheet glass manufacturing apparatus, the cleaving device rolls along the front surface of the second area in order to cleave the sheet glass along the scribe line and the back surface supporting member that supports the back surface side of the first area. And a rolling element that pushes the region to the back surface side. With such a configuration, it is possible to enjoy the same effects as those of the corresponding configuration described above.

As described above, according to the present invention, even when the plate glass is bent, the plate glass can be reliably cut along the scribe line by the bending stress.

It is a perspective view which shows the cleaving device contained in the manufacturing apparatus of the sheet glass which concerns on one Embodiment of this invention. It is the front view which expanded the principal part of the cleaving apparatus shown in FIG. It is sectional drawing of the cleaving apparatus shown in FIG. It is a figure which shows the cleaving process contained in the manufacturing method of the sheet glass which concerns on one Embodiment of this invention, (a) is the state of the early stage of a cleaving process, (b) is the state of the middle stage of a cleaving process, (c) is The state of the final stage of the cleaving process is shown.

An embodiment according to the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, in the cleaving apparatus 1 included in the sheet glass manufacturing apparatus according to the embodiment of the present invention, the scribe line S is formed on the surface Gx side of the boundary portion between the first region Ga and the second region Gb. The plate glass G thus cut is cut along the scribe line S by bending stress. In this embodiment, two scribe lines S are formed on the plate glass G, and the plate glass G is arranged in a vertical posture (preferably a vertical posture) so that each scribe line S faces the vertical direction. In addition, in this embodiment, the center portion in the width direction is the first region Ga that is a necessary portion of the plate glass G, and both end portions in the width direction are the second regions Gb that are unnecessary portions of the plate glass G. For example, when the plate glass G is formed by the overflow downdraw method, the first region Ga is a product part having a relatively thin wall and the second region Gb is a non-product part including a part having a relatively thick wall. .. Of course, both the first region Ga and the second region Gb may be required parts.

The cleaving device 1 includes a first supporting device 2 for suspending and supporting the plate glass G, a back surface supporting member 3 for supporting the back surface Gy side of the first region Ga of the plate glass G, and a front surface Gx of the second region Gb of the plate glass G. And a rolling element 4 that pushes the front surface Gx of the second region Gb of the plate glass G toward the back surface Gy while rolling along. The front surface Gx and the back surface Gy of the plate glass G are main surfaces facing each other in the thickness direction of the plate glass 2. That is, the front surface Gx and the back surface Gy are terms for distinguishing the two main surfaces, and do not mean the surfaces (upper surface and lower surface) facing in the vertical direction.

The first support device 2 includes a rail member 21, a moving body 22 that slides along the rail member 21, and one or a plurality of upper support members 23 attached to the moving body 22.

In this embodiment, a plurality (two in the illustrated example) of upper support members 23 are attached to one moving body 22, and as the moving body 22 moves, the plurality of upper support members 23 are integrally formed on the rail member 21. It is designed to move along. Since the rail member 21 is provided along the width direction of the plate glass G, the plate glass G is conveyed in the width direction along the front and back surfaces. The rail member 21 may be provided in a direction perpendicular to the front and back surfaces of the plate glass G, and the plate glass G may be conveyed in a direction perpendicular to the front and back surfaces.

In this embodiment, the upper support member 23 is configured to sandwich and hold the upper part of the plate glass G from both front and back sides in the first region Ga of the plate glass G. Here, since the upper end edge Gu of the plate glass G is easily damaged, the upper support member 23 is preferably configured to contact the plate glass G at a position avoiding the upper end edge Gu of the plate glass G. In addition, the plurality of upper support members 23 may be attached to independent moving bodies 22 so that they can approach and separate from each other. By doing so, it is possible to apply tension to the plate glass G in the width direction, and it is easy to adjust the supporting position of the plate glass G even when the size of the plate glass G is changed. is there. Further, the upper support member 23 may be configured to hold only one surface of the upper portion of the plate glass G in the first region Ga of the plate glass G by negative pressure adsorption and holding. Further, the upper support member 23 does not have to be attached to the moving body 22, and may have a form in which the upper end Gu is gripped during the folding operation described later.

The back surface supporting member 3 is arranged in parallel with the scribe line S at a distance from the scribe line S in the width direction of the plate glass G at both ends in the width direction of the back surface Gy of the first region Ga of the plate glass G. The distance D1 in the width direction between the back surface support member 3 and the scribe line S is, for example, 10 to 30 mm (preferably 10 to 20 mm) (see FIG. 2 ). In this embodiment, the back surface support member 3 is a plate-shaped body (a surface plate) having a flat support surface for supporting the back surface Gy of the first region Ga of the plate glass G. The back surface support member 3 may be a round bar body having a support surface formed of a curved surface.

The rolling elements 4 are arranged at intervals in the width direction of the plate glass G from the scribe line S in each second region Gb of the plate glass G. The distance D2 in the width direction between the rolling element 4 and the scribe line S at the position where the rolling element 4 first contacts the plate glass G is, for example, 70 to 130 mm (see FIG. 2 ). In this embodiment, the rolling element 4 is composed of a cylindrical roller having a rotation axis 4a parallel to the scribe line S. The rolling element 4 preferably has a diameter of 10 to 30 mm. The rolling element 4 is divided into a plurality of pieces (preferably three or more pieces) in the vertical direction. Each of the divided rolling elements 4 is rotatable about its own rotation shaft 4a. The rotating shafts 4a of the rolling elements 4 may be the same shafts that are continuous with each other, but in this embodiment, they are independent shafts that are positioned on the same straight line. Each rolling element 4 is a free roller, and is driven to rotate along the surface Gx of the second region Gb of the plate glass G by the frictional force generated by the contact with the surface Gx of the second region Gb of the plate glass G. ing. The rolling element 4 may be driven and rotated. Further, the rolling element 4 may not be divided in the vertical direction and may be composed of one roller. Furthermore, the rolling element 4 is not limited to a roller as long as it can roll along the surface Gx of the second region Gb of the plate glass G, and may be, for example, a spherical body (ball).

The surface of the rolling element 4 is formed of a material that is unlikely to scratch the surface Gx of the second region Gb of the plate glass G and that does not easily slip with the surface Gx of the second region Gb of the plate glass G. Is preferred. The surface of the rolling element 4 is formed of an elastic body such as rubber, silicon, or resin. Specifically, the surface of the rolling element 3 is preferably, for example, natural rubber having a hardness of 40° to 70°.

As shown in FIG. 2, the scribe line S is at a position other than the upper end portion (including the upper end edge Gu) and the lower end portion (including the lower end edge Gd) of the plate glass G facing each other in the vertical direction (longitudinal direction of the scribe line S). Thus, it is formed on the surface Gx of the second region Gb of the plate glass G. That is, the upper end Su and the lower end Sd of the scribe line S are separated from the upper end edge Gu and the lower end edge Gd of the plate glass G. The vertical distance between the upper end Su of the scribe line S and the upper edge Gu of the plate glass G, and the vertical distance D3 between the lower end Sd of the scribe line S and the lower edge Gd of the plate glass G are, for example, 10 to 30 mm. Is.

In addition, the rolling elements 4 contact the surface Gx of the second region Gb of the plate glass G at positions other than the upper end and the lower end of the plate glass G. That is, the contact portion between the rolling element 4 and the surface Gx of the second region Gb is separated from the upper edge Gu and the lower edge Gd of the plate glass G. In this embodiment, the vertical distance between the contact portion of the rolling element 4 at the highest position and the upper edge Gu of the plate glass G, and the contact portion of the rolling element 4 at the lowest position and the lower end of the sheet glass G are set. The vertical distance D4 from the edge Gd is, for example, 10 to 50 mm.

The sizes of D1, D2, D3, and D4 are not limited to the numerical ranges exemplified above, and can be appropriately adjusted according to the size and thickness of the plate glass G.

Further, in this embodiment, the rolling element 4 includes the second region of the glass sheet G only within the formation range of the scribe line S excluding the upper end (including the upper end Su) and the lower end (including the lower end Sd) of the scribe line S. It contacts the surface Gx of Gb. In other words, the vertical dimension L1 of the sheet glass G>the vertical dimension L2 of the scribe line>the vertical dimension L3 of the contact portion between the rolling element 4 and the surface Gx of the second region Gb is established, and the lateral relationship is established. When viewed from the direction, of the three regions having these dimensional relationships, both ends of a region having a larger vertical dimension do not overlap with both ends of a region having a smaller vertical dimension. Here, in this embodiment, since the rolling element 4 is divided into a plurality of pieces in the vertical direction, the vertical dimension L3 is the vertical dimension L31 of the contact portion between each rolling element 4 and the surface Gx of the second region Gb. , L32, L33 (L3=L31+L32+L33). The vertical dimensions L31, L32, L33 may be the same or different. In the latter case, for example, the relationship of L32>L31=L33 or the relationship of L32<L31=L33 may be satisfied.

In this embodiment, the back surface support member 3 protrudes vertically from the upper end portion and the lower end portion of the plate glass G so as to support the entire region of the back surface Gy of the first region Ga of the plate glass G in the vertical direction. That is, the vertical dimension L4 of the back surface support member 3 is longer than the vertical dimension L1 of the plate glass G. When the back surface support member 3 supports the entire area of the back surface Gy in the vertical direction of the first area Ga of the plate glass G, L4 may be equal to L1. Further, L4 may be smaller than L1, and the back surface support member 3 may be in contact with the back surface Gy of the first region Ga of the plate glass G at positions other than the upper end portion and the lower end portion of the plate glass G.

As shown in FIG. 3, in this embodiment, in order to prevent the second region Gb of the plate glass G from dropping near the first region Ga of the plate glass G after cutting, the back surface Gy side of the second region Gb is It is supported by the second supporting device 5. The second support device 5 includes a robot arm 51 and a vacuum cup (sucker) 52 attached to the tip of the robot arm 51. The robot arm 51 adjusts the position of the vacuum cup 52 so as to retreat to the back surface Gy side of the plate glass G so as not to impede the pushing operation of the rolling element 4 into the second region Gb of the plate glass G. The robot arm 51 also adjusts the angle of the vacuum cup 52 as needed. The vacuum cup 52 is made of an elastic body such as rubber that can be deformed in accordance with the bending deformation of the plate glass G, and holds the back surface Gy of the second region Gb of the plate glass G by negative pressure suction. Note that the second supporting device 5 may be configured to, for example, sandwich and support the plate glass G from both front and back sides as long as it does not hinder the pushing operation of the rolling element 4 accompanied by rolling. The second support device 5 may be omitted.

Next, a method for manufacturing plate glass using the plate glass manufacturing apparatus configured as described above will be described.

First, in the process upstream of the position shown in FIG. 1, the surface of the glass sheet G is pressed by a wheel cutter or irradiated with laser while the upper portion of the glass sheet G is supported by the upper support member 23 of the first supporting device 2. A scribe line S is formed on Gx. The scribe line S is formed linearly along the vertical direction of the plate glass G, excluding the upper end and the lower end of the plate glass G. Here, the thickness of the plate glass G is, for example, 0.7 mm or less, preferably 0.2 mm to 0.5 mm, and more preferably 0.2 mm to 0.3 mm.

Next, with the upper portion of the plate glass G on which the scribe line S is formed being supported by the upper support member 23 of the first supporting device 2, the moving body 22 is moved along the rail member 21 to convey the plate glass G. Then, it is stopped at the position shown in FIG. When the plate glass G stops, as shown in FIG. 3, the back surface support member 3 approaches and contacts the back surface Gy side of the first area Ga of the plate glass G, and the rolling elements 4 move to the front surface Gx side of the second area Gb. Get close and touch. Further, in this embodiment, the back surface Gy side of the second region Gb is adsorbed by the vacuum cup 52 attached to the tip of the robot arm 51 of the second support device 5.

In this state, as shown in FIGS. 4A to 4C, the rolling element 4 pushes the front surface Gx of the second region Gb of the plate glass G toward the back surface Gy.

Specifically, first, as shown in FIG. 4A, the rolling element 4 contacts the surface Gx of the second region Gb of the plate glass G. At this time, the rolling element 4 and the surface Gx of the second region Gb of the plate glass G come into contact with each other at a point P1. For convenience of explanation, the state of the plate glass G in FIG. 4A is called an initial state.

Next, as shown in FIG. 4B, the rolling element 4 moves straight in the X direction (plate thickness direction) perpendicular to the surface Gx of the second region Gb of the plate glass G in the initial state. As a result, the second region Gb of the plate glass G bends starting from the back surface support member 3. In this process, the rolling element 4 moving in the X direction rolls along the surface Gx of the second region Gb due to the friction generated between the rolling element 4 and the plate glass G, and the relative position with respect to the plate glass G is widthwise outside (scribe line). It is moved in the Y direction away from S). Along with this, the contact position between the plate glass G and the rolling element 4 continuously changes, for example, between the points P1 and P2 from the point P1 to the point P2. Therefore, even if the plate glass G (second region Gb) is bent, the rolling elements 4 sequentially change the contact position with respect to the plate glass G while rolling, and follow the bending deformation of the plate glass G. Therefore, the contact state between the rolling elements 4 and the plate glass G is stable, and undue slippage between the rolling elements 4 and the plate glass G is unlikely to occur. Therefore, even if the plate glass G is bent, the bending stress sufficiently acts on the scribe line S formed near the back surface supporting member 3.

Then, as shown in FIG. 4(c), when the rolling element 4 is further moved in the X direction from the state of FIG. 4(b), the rolling element 4 moves relative to the plate glass G while the rolling element 4 rolls. The specific contact position further moves outward in the width direction (Y direction) and, for example, continuously changes between the points P2 and P3 from the point P2 to the point P3. By such an operation of the rolling element 4, the bending stress acting on the scribe line S is further increased, and the plate glass G can be reliably cut along the scribe line S.

Although the rolling element 4 moves straight in the X direction at a constant speed in this embodiment, it may move straight while changing the speed in the X direction.

Further, the rolling element 4 may be moved straight in an oblique direction forming an angle with the X direction, instead of being moved straight in the X direction perpendicular to the surface Gx of the plate glass G in the initial state. In this case, the rolling element 4 may be slanted so as to shift to the outer side in the width direction as it goes to the back surface Gy side of the plate glass G, or the width direction inner side as it goes to the back surface Gy side of the plate glass G. You may move diagonally so that it may transfer to. In the former case, the rolling element 4 rolls outward in the width direction along the surface Gx of the second region Gb due to the friction generated between the rolling element 4 and the plate glass G. In the latter case, the rolling element 4 rolls inward in the width direction along the surface Gx of the second region Gb due to the friction generated between the rolling element 4 and the plate glass G.

In this embodiment, when the rolling element 4 is pushed in as described above, the scribe line S and the rolling element 4 are separated from the upper end edge Gu and the lower end edge Gd of the plate glass G as shown in FIG. It is possible to prevent the improper cracking starting from the upper edge Gu and the lower edge Gd.

Further, in this embodiment, when the rolling element 4 is pushed in as described above, as shown in FIG. 2, the scribe line S is formed at a position separated from the upper end edge Gu and the lower end edge Gd of the plate glass G. The rolling elements 4 are located in the second region Gb of the plate glass G only within the formation range of the scribe line S excluding the upper end and the lower end of the scribe line S (the region below the upper end Su and above the lower end Sd). The front surface Gx is pushed to the back surface Gy side. By pushing the rolling element 4 in such a manner, the bending stress acting on the scribe line S becomes more appropriate, and accurate fracture along the scribe line S can be realized more reliably. In the case of cutting in such an aspect, after the central region of the scribe line S is first cleaved, the cleaved region progresses in the vertical direction, and the plate glass G is vertically moved along the scribe line S. It is considered that the entire direction is broken.

Here, as shown in FIG. 4C, after the plate glass G is cleaved, the second region Gb of the plate glass G does not drop and is maintained in a state of being sucked and supported by the vacuum cup 52 of the robot arm 51. .. The second region Gb separated from the first region Ga of the plate glass G is, for example, at a position where the first region Ga of the plate glass G is not affected, and the suction of the vacuum cup 52 is released to be dropped and collected.

When the plate glass G is cut as described above, the first region Ga of the plate glass G supported by the upper support member 23 is subjected to subsequent manufacturing-related processes (end face processing such as trimming, chamfering, cleaning, film formation, etc.). In order to perform the process (1), the moving body 22 is moved along the rail member 21 so that the moving body 22 is conveyed from the position shown in FIG.

Although the sheet glass manufacturing apparatus and the manufacturing method thereof according to the embodiment of the present invention have been described above, the embodiment of the present invention is not limited to this, and various modifications can be made without departing from the scope of the present invention. It is possible to apply.

In the above-described embodiment, the plate glass manufacturing apparatus (or manufacturing method) may further include a molding device (or a molding step) on the upstream side of the cleaving device 1 for molding plate glass from molten glass. The forming device forms the sheet glass G by an overflow down draw method, a float method, or the like. However, when the plate glass G is suspended and supported and is conveyed and cleaved in the vertical posture as in the above embodiment, the plate glass G is preferably formed by the overflow downdraw method. This is because in the case of the overflow down draw method, the plate glass G is formed in a vertical posture, and therefore, when the plate glass G is conveyed and cleaved, a large posture change of the plate glass G is not necessary. In this case, the manufacturing device (or manufacturing method) is a cutting device (or a cutting device) that cuts a long glass ribbon in a width direction at predetermined intervals (bending stress cutting, laser cutting, etc.) on the upstream side of the cutting device 1. Process) may be further provided.

In the above embodiment, the plate glass G may be in a horizontal position (preferably a horizontal position). In this case, it is preferable to push the upper surface of the plate glass G to the lower surface side (downward) by the rolling elements 4 while the lower surface of the plate glass G is supported by the back surface support member 3. With this configuration, even after the plate glass G is cut, even if the second region Gb of the plate glass G is dropped at that position, it is unlikely to come into contact with the first region Ga of the plate glass G. The second support device 5 that supports the second region Gb may be omitted. Further, the lower surface of the plate glass G may be pushed toward the upper surface side (upward) by the rolling elements 4 while the upper surface of the plate glass G is supported by the back surface support member 3. In addition, the posture of the glass sheet G may be an inclined posture inclined with respect to the vertical plane or the horizontal plane.

1 Cleaving device 2 1st support device 21 Rail member 22 Moving body 23 Upper support member 3 Back support member 4 Rolling body 4a Rotating shaft 5 2nd support device 51 Robot arm 52 Vacuum cup G Plate glass Ga 1st area Gb of plate glass Second area S scribe line

Claims (7)

The thickness and the first region in the following glass sheet 0.7mm to form a scribe line on the surface side of the boundary between the second region, the production method of the glass sheet including a cleaving step of cleaving the plate glass along the scribed line There
In the cleaving step, the rolling element is supported on the surface of the second region while the back face of the first region of the plate glass suspended and supported so that the scribe line is oriented in the vertical direction is supported by a back face supporting member. While rolling along, by pushing the second region to the back surface side by the rolling element, while splitting the plate glass along the scribe line ,
The rolling element is divided into a plurality in the direction along the scribe line, in the direction along the scribe line, the total length of the contact portion with the plate glass of each rolling element, each of the adjacent A method for producing a sheet glass, which is longer than a total length of non-contact portions between the rolling elements and the sheet glass. The method for producing a glass sheet according to claim 1, wherein the rolling element contacts the surface of the second region at positions other than both ends of the glass sheet facing each other in the longitudinal direction of the scribe line. The method for producing a sheet glass according to claim 1 or 2 , wherein the scribe line is formed at a position excluding both ends of the sheet glass that face each other in the longitudinal direction of the scribe line. The scribe line is formed at a position excluding both ends of the plate glass facing each other in the longitudinal direction of the scribe line, and the rolling element is only within the formation range of the scribe line excluding both ends of the scribe line. The method of manufacturing a sheet glass according to claim 2 , wherein the surface of the second region is in contact with the surface of the second region. The rolling elements, the manufacturing method of the glass sheet according to any one of claims 1 to 4, characterized in that a cylindrical roller having a rotational axis along the longitudinal direction of the scribe line. Method for producing a plate glass according to any one of claims 1 to 5, the thickness of the plate glass, characterized in that it is 0.3mm or less. Along the first region and the scribe line formed on the surface side of the boundary between the second region in the thickness 0.7mm or less of the glass sheet, the glass sheet an apparatus for producing a sheet glass having a cleaving device for cleaving,
The cleaving device includes an upper support member that suspends and supports the glass sheet so that the scribe line is oriented vertically, a back surface support member that supports a back surface side of the first region, and the glass plate along the scribe line. A rolling element that pushes the second region toward the back surface side while rolling along the surface of the second region,
The rolling element is divided into a plurality in the direction along the scribe line, in the direction along the scribe line, the total length of the contact portion of each rolling element with the plate glass, each of the adjacent A sheet glass manufacturing apparatus, which is longer than a total length of non-contact portions between the rolling elements and the sheet glass.

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