Method for manufacturing glass sheet

Abstract

When a breaking rod (5) is used to break a glass ribbon (2) moving downward in a longitudinal posture along a score line (3) extending in the width direction of the glass ribbon (2), thereby cutting a glass plate (2y) from the glass ribbon (2), the breaking rod (5) is brought into contact with a portion of the glass ribbon (2) above the score line (3), thereby breaking the glass ribbon (2) along the score line (3).

Description

Technical Field

[0001] The present invention relates to a method for producing a glass sheet, and a manufacturing apparatus thereof, for cutting out a glass sheet from a glass ribbon by breaking the glass ribbon moving downward in a vertical posture along a score line extending in the width direction thereof. Background Art

[0002] As is well known, in the field of glass sheet production, a glass sheet is cut out from a glass ribbon that is continuously formed by a down-draw method or the like and moves downward in a vertical posture. Specific examples of such a method and apparatus for producing a glass sheet include the method and apparatus disclosed in Patent Document 1.

[0003] In the method disclosed in the document, after a scoring line extending in the width direction of a glass ribbon moving downward in a longitudinal posture is formed by a scoring mechanism, a breaking rod (a fulcrum rod in the document) is brought into contact with the scoring line forming region of the glass ribbon. Then, the scoring line forming region is bent using the breaking rod as a fulcrum, thereby breaking the glass ribbon along the scoring line, thereby cutting a glass sheet from the glass ribbon.

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2018-90446 Summary of the invention

[0007] Problems to be solved by the invention

[0008] According to the method disclosed in Patent Document 1, the breaking rod is brought into contact with a portion of the glass ribbon at the same height as the score line. In such a case, cracks may develop up and down from the score line as a starting point during breaking, causing the glass to break or be damaged. Therefore, the quality of the cut glass sheet may be reduced and the product yield may be deteriorated.

[0009] From the above viewpoints, an object of the present invention is to reduce the probability of occurrence of cracks, damages, etc. when a glass ribbon is broken using a breaking rod, thereby improving the quality of cut glass sheets and improving the product yield.

[0010] Solutions to Solve Problems

[0011] A first aspect of the present invention made to solve the above-mentioned problems is a method for manufacturing a glass sheet, which uses a breaking rod to break a glass ribbon moving downward in a longitudinal posture along a score line extending in the width direction of the glass ribbon, thereby cutting a glass sheet from the glass ribbon. The method for manufacturing the glass sheet is characterized in that the breaking rod is brought into contact with a portion of the glass ribbon above the score line to break the glass ribbon along the score line.

[0012] According to this method, when the glass ribbon is broken along the scribed line, since the breaking rod contacts the part above the scribed line, the contact position of the breaking rod and the formation position of the scribed line are separated in the vertical direction. Therefore, the probability of the crack developing up and down with the scribed line as the starting point is reduced, and the glass is not easily broken or damaged. As a result, the quality of the cut glass sheet is improved and the product yield is improved. Here, it is assumed that if the breaking rod is brought into contact with the glass ribbon at the same height as the scribed line, the reaction (repeated shaking) of the broken glass sheet becomes larger, the glass sheet contacts the breaking rod again and is broken, or the cut surface contacts the breaking rod after breaking, resulting in cracks or the position where the breaking rod contacts is offset. However, according to this method, such undesirable situations can be effectively avoided.

[0013] In this method, the breaking rod may be brought into contact with a portion of the glass ribbon that is separated upward from the scored line by a distance of 5 mm or more and less than 70 mm.

[0014] In this way, the probability of cracks developing up and down from the scored line as the starting point can be reliably reduced, and the tensile stress from the breaking rod to the glass ribbon can be appropriately applied to the scored line. In detail, when the lower limit of the above range is less than 5 mm, the probability of cracks developing up and down from the scored line as the starting point cannot be sufficiently reduced, and as a result, the glass may be broken or damaged. In addition, when the upper limit of the above range is more than 70 mm, it is difficult for the breaking rod to apply an appropriate force to the scored line of the glass ribbon, which may cause cutting errors. However, if it is within the above numerical range in the method here, such an undesirable situation is not easy to occur.

[0015] Unlike the configuration in this method, the breaking bar may be brought into contact with a portion of the glass ribbon that is separated from the scored line by 5 mm or more upward and reaches the lower end of an effective region.

[0016] Thus, the effect brought about by setting the lower limit of the above range to 5 mm is as described above. In addition, by setting the upper limit of the above range to the lower end of the effective area, it is possible to avoid the undesirable situation such as damage in the effective area of ​​the glass ribbon (the area that becomes the product glass plate) due to contact with the breaking rod, which can help improve the quality of the product glass plate.

[0017] In the above method, the breaking rod may be brought into contact with the glass ribbon by contact in a state where the scored line formation region of the glass ribbon is bent in the vertical direction.

[0018] In this way, since breaking is completed at the time when the breaking bar is brought into contact with the glass ribbon, there is little deviation or change in the time required for breaking, and the production cycle time is also shortened.

[0019] In this method, the breaking bar may be brought into contact with the glass ribbon by contact at the same time as when an operation of bending the scored line formation region of the glass ribbon in the longitudinal direction is completed.

[0020] In this way, the action of bending the glass ribbon and the action of making the breaking rod touch the glass ribbon are performed at appropriate times, and the breaking operation can be performed smoothly. Here, the above-mentioned "the same period as the period when the bending action is completed" means not only the same period as the period when the bending action is completed, but also includes the period within 1 second before and after the period when the bending action is completed. It should be noted that, according to the understanding of the present inventors, since it is preferred to make the breaking rod touch the glass ribbon before the period when the bending action is about to be completed, it is preferred to make the breaking rod touch the glass ribbon before the period when the bending action is completed and within 1 second of the period.

[0021] A second aspect of the present invention, which is made to solve the above-mentioned problems, is a glass sheet manufacturing device comprising: a breaking rod for breaking the glass ribbon along a score line extending in the width direction of the glass ribbon when a glass sheet is cut out from a glass ribbon moving downward in a longitudinal posture; and a moving mechanism for moving the breaking rod toward the glass ribbon, wherein the glass sheet manufacturing device is characterized in that the moving mechanism is configured to move the breaking rod toward a portion of the glass ribbon above the score line and contact the portion.

[0022] According to the manufacturing device, when the glass ribbon is broken, the moving mechanism makes the breaking rod contact the portion of the glass ribbon above the score line. Therefore, the manufacturing device also reduces the probability of cracks growing up and down from the score line as a starting point, and is less likely to cause glass breakage and damage, etc.

[0023] Effects of the Invention

[0024] According to the present invention, the probability of occurrence of cracks, damages, etc. when a glass ribbon is broken using a breaking rod is reduced, and the quality of cut glass sheets and the product yield are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a side view which shows the schematic structure of the manufacturing apparatus of the glass plate which concerns on embodiment of this invention.

[0026] Figure 2 1 is a front view showing a schematic structure of a glass plate manufacturing apparatus according to an embodiment of the present invention (according to Figure 1 The main view observed by the arrow X).

[0027] Figure 3 is in accordance with Figure 2 A cross-sectional top view obtained by cutting along the YY line.

[0028] Figure 4 It is a plan view showing a main part of a breaking rod which is a component of the manufacturing apparatus of the glass sheet according to the embodiment of the present invention.

[0029] Figure 5 This is a schematic side view showing an implementation state of the method for producing a glass plate according to the embodiment of the present invention.

[0030] Figure 6 This is a schematic side view showing an implementation state of the method for producing a glass plate according to the embodiment of the present invention.

[0031] Figure 7 This is a schematic side view showing an implementation state of the method for producing a glass plate according to the embodiment of the present invention.

[0032] Figure 8 This is a schematic side view showing an implementation state of the method for producing a glass plate according to the embodiment of the present invention. DETAILED DESCRIPTION

[0033] Hereinafter, a method and an apparatus for manufacturing a glass plate according to an embodiment of the present invention will be described with reference to the drawings.

[0034] Figure 1 1 is a side view illustrating a glass plate manufacturing apparatus according to an embodiment of the present invention. Figure 2 is in accordance with Figure 1 The manufacturing device 1 is a front view obtained by observing the manufacturing device in the direction of the arrow X. As shown in these figures, the manufacturing device 1 includes: a scoring mechanism S, which forms a scoring line 3 extending in the width direction of the glass ribbon 2 moving downward (in the direction of the arrow Z) in a longitudinal posture; a supporting mechanism 4, which supports the predetermined cut-out portion 2x of the glass ribbon 2 that exists below the scoring line 3; and a breaking rod 5 that abuts against the glass ribbon 2. The manufacturing device 1 also includes a moving mechanism 6 that moves the breaking rod 5 in the horizontal direction toward the glass ribbon 2 and moves it back to the retreat position. Here, the moving mechanism 6 is configured to break the glass ribbon 2 as in Figure 1 As shown by the solid line in the middle, the breaking rod 5 is moved to the upper side of the scoring line 3 and abuts against the surrounding portion of the scoring line formation area 2s (hereinafter referred to as the scoring line formation area 2s) while being bent in the longitudinal direction. The moving mechanism 6 is composed of a cylinder in the present embodiment, but may also be a feeding device such as a working cylinder or a ball screw mechanism.

[0035] The scoring mechanism S comprises a cutter wheel 7, one side of which is provided on the surface 2a of the glass ribbon 2 moving in the arrow Z direction along the width direction (in Figure 1 The glass ribbon 2 is provided with a plurality of support rods 8, each of which is provided with a plurality of support rods 8 and a plurality of support rods 8. The support rods 8 are ...

[0036] The breaking rod 5 contacts the back surface 2b of the glass ribbon 2 above the score line 3 by touching, and has a contact side end 5a whose longitudinal cross-sectional side surface contacts the back surface 2b of the glass ribbon 2 and is convex (e.g., semicircular or curved). Here, the portion above the score line 3 to which the breaking rod 5 contacts refers to a portion of the unbent glass ribbon 2 separated from the score line 3 by a predetermined distance L1 to the upper side. The predetermined distance L1 is 5 mm or more and less than 70 mm. In addition, if the glass ribbon 2 has an effective area (the area of ​​the product glass sheet), the predetermined distance L1 may be set to 5 mm or more and less than the distance from the score line 3 to the lower end of the effective area. The predetermined distance L1 in this case is set to 5 mm or more and less than 20 mm in consideration of the effective area of ​​the glass ribbon 2 in this embodiment. Both ends of the breaking rod 5 in the width direction are located on the inner side of the width direction than both ends of the glass ribbon 2 in the width direction.

[0037] Figure 3 is in accordance with Figure 2 A cross-sectional top view obtained by cutting along the YY line of the glass ribbon 2. As shown in the figure, the glass ribbon 2 is in a state where the shape along the width direction (WW direction) is a curved shape convex to one side (surface 2a side), and its two ends in the width direction are gripped by a pair of claws 11ax of the clamp 11a described later. For the abutting side end 5a of the breaking rod 5, the shape along the width direction is a curved shape convex to the same side as the glass ribbon 2. In this embodiment, the shape of the breaking rod 5 itself along the width direction is also a curved shape convex to the same side as the glass ribbon 2. Moreover, the breaking rod 5 is divided into two breaking rod components 5x and 5y, and the two components 5x and 5y are connected at the central position in the width direction of the breaking rod 5. Moreover, the two components 5x and 5y are symmetrical in shape. Therefore, the two components 5x and 5y have abutting side ends 5xa and 5ya, respectively, and the two abutting side ends 5xa and 5ya are connected to form the abutting side end 5a of the breaking rod 5 described above.

[0038] Figure 4: is an enlarged top view of the main part of the connection part of the two breaking rod members 5x and 5y. As shown in the figure, in the connection part of the two breaking rod members 5x and 5y, the respective ends 5xb and 5yb on the glass ribbon 2 side are in contact, and the breaking rod 5 is symmetrical in the width direction with the ends 5xb and 5yb as the center. In addition, the gap SP between the opposing end surfaces 5xc and 5yc of the two breaking rod members 5x and 5y gradually expands toward the side opposite to the glass ribbon 2 side. And, the two breaking rod members 5x and 5y are connected in a manner that the angle formed by the two 5x and 5y can be adjusted. The angle adjustment mechanism MC for adjusting the angle has: a plate PL, which is attached to the two members 5x and 5y across the two members 5x and 5y and has a long hole HL; and bolts Bx and By, which are inserted into the long hole HL of the plate PL and screwed into the two members 5x and 5y. According to the angle adjustment mechanism MC, after the bolts Bx and By are loosened and the angle of the two members 5x and 5y is changed with the contact portion of the two ends 5xb and 5yb thereof as a fulcrum, the bolts Bx and By are tightened to adjust the angle of the two members 5x and 5y. The angle of the two members 5x and 5y is adjusted every time the curvature of the curved shape of the glass ribbon 2 changes.

[0039] Refer again Figure 1 as well as Figure 2 The components of the manufacturing device 1 are described. A suction nozzle 9 for sucking glass powder generated by breaking is arranged at the back side of the score line 3 of the glass ribbon 2. The suction nozzle 9 has an opening 9a facing the surface 2a of the glass ribbon 2, and sucks the glass powder through the opening 9a by the operation of a negative pressure generating device (not shown) such as a negative pressure pump.

[0040] The support mechanism 4 includes an arm 10 extending along the longitudinal direction of the glass ribbon 2 and a chuck group 11 composed of a plurality of (five in this embodiment) chucks 11a mounted on the arm 10 at intervals. The arm 10 and the chuck group 11 are respectively arranged on one side and the other side in the width direction of the glass ribbon 2. The plurality of chucks 11a each include a pair of claws 11ax for gripping the planned cut-out portion 2x of the glass ribbon 2 in the thickness direction.

[0041] The support mechanism 4 is configured to change its posture from the state in which the predetermined cutting portion 2x is supported to the state in which the predetermined cutting portion 2x is supported. Figure 1 The basic posture shown by the dotted line changes to the inclined posture shown by the solid line in the figure. The posture of the support mechanism 4 is changed by the position of the broken rod 5 (in Figure 1The support mechanism 4 is realized by the rotational movement of the support mechanism 4 centered around the position shown by the solid line in the middle. Moreover, the change of the posture of the support mechanism 4 is performed while moving downward at the same speed as the glass ribbon 2. Moreover, the support mechanism 4 bends the peripheral portion of the scoring line forming area 2s of the glass ribbon 2 in a manner that becomes convex on the longitudinal upper surface 2a side through the above-mentioned rotational movement. This rotational movement of the support mechanism 4 is performed simultaneously with the movement of the moving mechanism 6 to move the breaking rod 5 toward the glass ribbon 2. Moreover, the moving mechanism 6 makes the breaking rod 5 touch the glass ribbon 2 at the same time as the time when the rotational movement of the support mechanism 4 is completed. Specifically, the moving mechanism 6 is configured to make the breaking rod 5 touch the glass ribbon 2 within 1 second before and after the time when the rotational movement of the support mechanism 4 is completed and the action of bending the glass ribbon 2 is completed. In this embodiment, the moving mechanism 6 is configured to make the breaking rod 5 touch the glass ribbon 2 before the time when the rotational movement of the support mechanism 4 is about to be completed, in other words, before the time and within 1 second of the time. During the period when the support mechanism 4 supports the predetermined cut-out portion 2x, Figure 3 As shown, the glass ribbon 2 is curved so that the surface 2a side becomes convex in the width direction.

[0042] In this embodiment, the arm 10 and the chuck group 11 disposed on one side in the width direction of the glass ribbon 2 and the arm 10 and the chuck group 11 disposed on the other side in the width direction of the glass ribbon 2 are configured to rotate integrally. However, the arms 10 and the chuck groups 11 on both sides may rotate independently.

[0043] Among the components of the manufacturing device 1, the breaking rod 5 and the supporting rod 8 are mounted on a first housing (not shown) arranged on the back side 2b of the glass ribbon 2, and the cutter wheel 7 and the suction nozzle 9 are mounted on a second housing (not shown) arranged on the surface 2a of the glass ribbon 2. The first housing and the second housing can move in the up-down direction, respectively. Thus, the breaking rod 5 and the supporting rod 8 are configured to move up-down integrally with the first housing while maintaining their relative positional relationship in the up-down direction. In addition, the cutter wheel 7 and the suction nozzle 9 are configured to move up-down integrally with the second housing while maintaining their relative positional relationship in the up-down direction.

[0044] Each of the first shell and the second shell can follow the glass ribbon 2 and move downward at the same speed as the downward movement speed of the glass ribbon 2. Therefore, the breaking rod 5, the supporting rod 8, the cutter wheel 7 and the suction nozzle 9 are each configured to move downward at the same speed as the moving speed of the glass ribbon 2 as the first shell and the second shell follow the downward movement of the glass ribbon 2, and to perform their own functions. Similarly, the supporting mechanism 4 is also configured to move downward at the same speed as the moving speed of the glass ribbon 2, and to perform their own functions. Therefore, when the above-mentioned components of the manufacturing device 1 perform their own functions, the relative speed along the vertical direction relative to the glass ribbon 2 is zero.

[0045] Among the above-mentioned components, the breaking rod 5, the supporting rod 8, the cutter wheel 7 and the suction nozzle 9 are configured as shown in Figure 1 As shown by the arrows in the figure, the components move along the thickness direction of the glass ribbon 2 between the working position for performing their functions and the retreat position for separating from the glass ribbon 2. The movement of the above components along the thickness direction is carried out while moving downward at the same speed as the glass ribbon 2. It should be noted that the breaking rod 5, the cutter wheel 7, the support rod 8 and the suction nozzle 9 are Figure 1 The position indicated by the solid line is the operating position, and the position indicated by the dashed line in the figure is the retreat position.

[0046] A restraining roller 12 is disposed above the scoring mechanism S on the surface 2a side of the glass ribbon 2, and serves as a fulcrum when the glass ribbon 2 is bent by the rotation of the supporting mechanism 4. When the glass ribbon 2 is broken, tension is applied to the glass ribbon 2 (the peripheral portion of the scoring line forming region 2s) between the supporting mechanism 4 and the restraining roller 12. Therefore, when the breaking rod 5 contacts the glass ribbon 2, tension is applied to the contacted portion of the glass ribbon 2.

[0047] Next, refer to Figures 5 to 8 A method for producing a glass plate using the above-described production apparatus 1 will be described.

[0048] In the manufacturing method of the glass sheet of the present embodiment, the glass ribbon 2 to be broken is formed by, for example, a down-draw method (such as overflow down-draw method). The glass ribbon 2 is formed to a thickness of, for example, 1000 μm or less (preferably 700 μm or less and 100 μm or more) and has flexibility to bend under the action of external force.

[0049] The method for manufacturing a glass sheet according to the present embodiment roughly includes a scoring step of forming the score lines 3 on the glass ribbon 2 and a breaking step of breaking the glass ribbon 2 along the score lines 3 formed in the scoring step to cut out a glass sheet.

[0050] In the scribing process, Figure 5As shown, first, the cutter wheel 7 and the support rod 8 are moved from the retreat position to the operating position while the plurality of chucks 11a of the support mechanism 4 support the cut-out portion 2x. Next, the cutter wheel 7 moved to the operating position is moved along the width direction on the surface 2a of the glass ribbon 2 to form the scored line 3.

[0051] After the scoring process is completed as described above, the cutter wheel 7 and the support rod 8 are moved from the working position to the retreat position. In this case, the multiple clamps 11a of the support mechanism 4 continue to support the predetermined cut portion 2x after the scoring process is completed. Here, at the time point when the scoring process is completed, the cutter wheel 7 and the support rod 8 are in a state of being located at the same height position as the scoring line 3. As a preparation for executing the breaking process from this state, both the first shell and the second shell are moved upward relative to the glass ribbon 2. Thus, as Figure 6 As shown, the breaking rod 5 is held at a height position separated from the score line 3 by a predetermined distance L1 upward, and the suction nozzle 9 is held at the same height position as the score line 3 .

[0052] In the breaking process, Figure 7 As shown in FIG. 1 , the support mechanism 4 is rotated in the direction indicated by the arrow C while the breaking rod 5 and the suction nozzle 9 are kept in the retracted position. As a result, the posture of the support mechanism 4 changes from the basic posture to the inclined posture, and the peripheral portion of the scored line forming area 2s of the glass ribbon 2 begins to bend in a manner that the surface 2a side becomes convex. At this time, the portion of the glass ribbon 2 that is higher than the scored line forming area 2s is supported by the limiting roller 12, so that tension is applied to the peripheral portion of the scored line forming area 2s. In the middle of the rotation of the support mechanism 4, the moving mechanism 6 moves the breaking rod 5 toward the glass ribbon 2 in the horizontal direction. Similarly, the suction nozzle 9 also moves toward the glass ribbon 2. And, at the time point when the angle α of the support mechanism 4 relative to the plumb line reaches the preset inclination angle, that is, before the rotation of the support mechanism 4 is about to be completed, the contact side end 5a of the breaking rod 5 is brought into contact with the back surface 2b of the glass ribbon 2 by the moving mechanism 6. In this case, the portion where the abutting end portion 5a of the breaking rod 5 contacts the back surface 2b of the glass ribbon 2 is separated upward from the score line 3 by a predetermined distance L1 (strictly speaking, Figure 6 The contact side end 5a of the breaking rod 5 when it touches the glass ribbon 2 is formed in a side view. Figure 1 The shape shown by the solid line in the middle, and when viewed from above, it becomes Figure 3 In this case, the center portion in the width direction of the contact side end portion 5a of the breaking rod 5 contacts the back surface 2b of the glass ribbon 2 before other portions (the peripheries of both end portions in the width direction, etc.).

[0053] By this action, the glass ribbon 2 is broken along the score line 3, and the predetermined portion 2x is cut out as a glass plate 2y. Figure 8 As shown, the cut end face 2z at the lower end of the glass ribbon 2 and the cut end face 2yz at the upper end of the glass plate 2y do not contact each other, and the breaking rod 5 does not contact the glass ribbon 2 (2z) and the glass plate 2y (2yz). It should be noted that the glass powder generated by the breaking is sucked by the suction nozzle 9.

[0054] According to the present embodiment in which the breaking is performed as described above, the following effects are obtained.

[0055] In the present embodiment, when the glass ribbon 2 is broken along the score line 3, the breaking rod 5 contacts the portion above the score line 3, so the contact position of the breaking rod 5 is separated from the formation position of the score line 3 in the vertical direction. Therefore, the phenomenon that the crack develops up and down with the score line 3 as the starting point disappears, and it is not easy to cause the glass to break or be damaged. As a result, the quality of the cut glass plate 2y is improved and the product yield is improved. Here, it is assumed that if the breaking rod 5 is made to contact at the same height position as the score line 3, the reaction (repeated shaking) of the broken glass plate 2y becomes larger, and it contacts the breaking rod 5 again, causing damage to the glass plate 2y, or its cut surface 2z contacts the breaking rod 5, causing rupture, etc. However, in the present embodiment, such undesirable conditions are effectively avoided.

[0056] In the present embodiment, the breaking rod 5 is brought into contact with a portion of the glass ribbon 2 that is separated from the score line 3 by a predetermined distance L1 upward. Here, when the predetermined distance L1 is set to be greater than 5 mm and less than 70 mm, the probability of a crack developing upward and downward from the score line 3 as a starting point can be reliably reduced, and the contact force of the breaking rod 5 to the glass ribbon 2 can be appropriately applied to the score line 3. In detail, when the lower limit value of the predetermined distance L1 is less than 5 mm, it is difficult to sufficiently reduce the probability of a crack developing upward and downward from the score line 3 as a starting point, which may cause the glass to break or be damaged. In addition, when the upper limit value of the predetermined distance L1 is greater than 70 mm, it is difficult to appropriately apply the contact force of the breaking rod 5 to the glass ribbon 2 to the score line 3, which may cause a cutting error. However, in the structure here, such an undesirable situation is not easy to occur.

[0057] In addition, unlike the above-mentioned case, when the above-mentioned predetermined distance L1 is set to be greater than 5 mm and is the distance from the scribed line 2 to the lower end of the effective area of ​​the glass ribbon 2, it is possible to avoid undesirable situations such as damage to the effective area of ​​the glass ribbon 2 (the area that becomes the product glass plate) due to contact with the breaking rod 5, which can help improve the quality of the product glass plate.

[0058] In this embodiment, the breaking rod 5 is brought into contact with the glass ribbon 2 while the peripheral portion of the area 2s where the scribe line 3 of the glass ribbon 2 is formed is bent in the longitudinal direction, so that the breaking is completed at the time of contact. As a result, the deviation or variation of the time required for breaking is reduced, and the production interval time is also shortened.

[0059] In the present embodiment, the breaking rod 5 is brought into contact with the glass ribbon 2 at the same time as (immediately before) the completion of the action of bending the glass ribbon 2 in the longitudinal direction. Therefore, the action of bending the glass ribbon 2 and the action of bringing the breaking rod 5 into contact with the glass ribbon 2 are performed at appropriate timings, and the breaking operation can be performed smoothly.

[0060] As mentioned above, although the manufacturing method of the glass plate which concerns on embodiment of this invention was demonstrated, this invention is not limited to this, Various changes are possible in the range which does not deviate from the summary.

[0061] In the above embodiment, the breaking rod 5 is brought into contact with the glass ribbon 2 while the glass ribbon 2 is bent in the longitudinal direction. However, the breaking rod 5 may be brought into contact with the glass ribbon 2 and then the glass ribbon 2 is bent in the longitudinal direction to be broken. In such a case, the breaking rod 5 is not brought into contact with the glass ribbon 2.

[0062] In the above embodiment, the support mechanism 4 supports the portion 2x to be cut out of the glass ribbon 2 by the pair of claws 11ax of the chuck 11a. However, the portion 2x to be cut out may be supported by a suction pad that sucks the surface or back surface of the portion 2x.

[0063] In the above-mentioned embodiment, the glass ribbon 2 is broken by bending the peripheral portion of the score line forming region 2s, but it can be broken in the same manner even when only the score line forming region 2s is bent. In other words, it can be broken in the same manner as long as at least the score line forming region 2s is bent.

[0064] Description of Reference Numerals

[0065] 1Glass plate manufacturing device

[0066] 2 Glass belt

[0067] 2a Surface of glass ribbon

[0068] 2b The back of the glass strip

[0069] 2s Scribe line formation area (Scribe line formation area)

[0070] 2x Cut out the predetermined part

[0071] 2y Glass Plate

[0072] 3 Score lines

[0073] 4 Support mechanism

[0074] 5-fold break rod

[0075] 6 Mobile mechanism

[0076] L1 Distance from the score line to the upper side

[0077] S scoring mechanism.

Claims

1. A method for producing a glass sheet, comprising: breaking a glass ribbon moving downward in a vertical posture along a score line extending in a width direction of the glass ribbon using a breaking bar, thereby cutting a glass sheet from the glass ribbon; The method for manufacturing the glass plate is characterized in that: A breaking step is provided in which the breaking rod is brought into contact with a portion of the glass ribbon above the score line from a surface where the score line is not formed, thereby breaking the glass ribbon along the score line. In the breaking step, the support mechanism that supports the planned cutout portion below the score line is rotated to bend the peripheral portion of the score line formation region so that the surface side where the score line is formed in the longitudinal direction becomes convex.

2. The method for manufacturing a glass plate according to claim 1, wherein: The breaking bar is brought into contact with a portion of the glass ribbon that is separated upward from the scored line by a distance of 5 mm or more and less than 70 mm.

3. The method for manufacturing a glass plate according to claim 1, wherein: The breaking bar is brought into contact with a portion of the glass ribbon that is separated from the scored line by 5 mm or more upward and reaches a region that becomes a product glass sheet, that is, a lower end of an effective region.

4. The method for producing a glass plate according to any one of claims 1 to 3, wherein: The breaking bar is brought into contact with the glass ribbon by contact in a state where the scored line formation region of the glass ribbon is bent in the longitudinal direction.

5. The method for manufacturing a glass plate according to claim 4, characterized in that: The breaking bar is brought into contact with the glass ribbon by contact at the same time as the time at which the operation of bending the scored line formation region of the glass ribbon in the longitudinal direction is completed.

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