JP2022003001A - Manufacturing method of glass sheet, and manufacturing apparatus therefor - Google Patents

Abstract

To improve quality of a cut-out glass sheet, and to improve a product yield, by reducing an occurrence probability of crack, breakage or the like, when splitting a glass ribbon by using a splitting bar.SOLUTION: When cutting out a glass sheet 2y from a glass ribbon 2 by splitting the glass ribbon 2 moving downward in a longitudinal posture, by using a splitting bar 5 along a scribe line 3 extending in a width direction of the glass ribbon 2, the splitting bar 5 is brought into contact with a part above the scribe line 3 on the glass ribbon 2, and the glass ribbon 2 is split along the scribe line 3.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for manufacturing a glass plate and a manufacturing apparatus thereof so as to cut out a glass plate from the glass ribbon by breaking a glass ribbon moving downward in a vertical posture along a scrib line extending in the width direction thereof. ..

As is well known, in the field of manufacturing glass plates, a glass plate is cut out from a glass ribbon that is continuously molded by a down draw method or the like and moves downward in a vertical posture. Specific examples of the method and apparatus for manufacturing the glass plate in this way include those disclosed in Patent Document 1.

In the method disclosed in the same document, a scribe line extending in the width direction is formed on a glass ribbon moving downward in a vertical posture by a scribe means, and then a folding bar (a fold bar ( In the same document, the fulcrum bar) is brought into contact. Next, the glass ribbon is folded along the scribe line by bending the formation region of the scribe line with the fold bar as a fulcrum, whereby the glass plate is cut out from the glass ribbon.

Japanese Unexamined Patent Publication No. 2018-90446

According to the method disclosed in Patent Document 1, the folding bar is brought into contact with a portion of the glass ribbon having the same height as the scribe line. In this case, cracks may develop up and down starting from the scribe line at the time of folding, resulting in cracking or damage to the glass. Therefore, the quality of the cut glass plate may be deteriorated and the product yield may be deteriorated.

From the above viewpoint, the present invention aims to improve the quality of the cut glass plate and the product yield by reducing the probability of cracking or damage when the glass ribbon is broken by using the folding bar. Is the subject.

The first aspect of the present invention, which was devised to solve the above problems, is to fold a glass ribbon that moves downward in a vertical position along a scrib line extending in the width direction of the glass ribbon using a folding bar. A method for manufacturing a glass plate by cutting a glass plate from the glass ribbon by breaking the glass ribbon. The folding bar is brought into contact with a portion of the glass ribbon above the scrib line, and the glass ribbon is cut into the scrib line. It is characterized by folding along.

According to this method, when the glass ribbon is folded along the scribe line, the folding bar contacts the portion above the scribe line, so that the contact position of the folding bar and the formation position of the scribe line are aligned. Separate vertically. Therefore, the probability that the crack will grow up and down starting from the scribe line is reduced, and the glass is less likely to be broken or damaged. As a result, the quality of the cut glass plate is improved and the product yield is improved. Here, if the folding bar is brought into contact with the scribe line on the glass ribbon at the same height position, the recoil (swinging) of the glass plate after folding becomes large, and the glass plate reappears to the folding bar. The glass plate may be damaged by contact, or the split cross section may come into contact with the split bar after folding, resulting in cracking or the like, or the position where the split bar hits may shift. However, according to this method, such a defect is effectively avoided.

In this method, the folding bar may be brought into contact with a portion of the glass ribbon that is 5 mm or more and less than 70 mm above the scribe line.

By doing so, the probability that the crack will grow up and down starting from the scribe line is surely reduced, and the tensile stress on the glass ribbon by the folding bar can be appropriately applied to the scribe line. More specifically, when the lower limit of the above range is less than 5 mm, the probability that the crack will grow up and down starting from the scribe line cannot be sufficiently reduced, and as a result, the glass is broken or damaged, etc. May be invited. Further, when the upper limit of the above range is 70 mm or more, it becomes difficult for the folding bar to apply an appropriate force to the scribe line of the glass ribbon, which may lead to a cutting error or the like. However, if it is within the above numerical range in the method here, such a problem is unlikely to occur.

Apart from the configuration in this method, the folding bar may be brought into contact with a portion of the glass ribbon that is 5 mm or more upward from the scribe line and is distant within the range up to the lower end of the effective region.

By doing so, the effect of 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, problems such as scratches on the effective area of the glass ribbon (area that becomes the product glass plate) due to contact with the folding bar can be avoided. , Can contribute to improving the quality of product glass plates.

In the above method, the folding bar may be brought into contact with the glass ribbon by abutting against the glass ribbon in a state where the formation region of the scribe line in the glass ribbon is curved in the vertical direction.

By doing so, since the folding is completed when the folding bar is abutted against the glass ribbon, the variation or variation in the time required for the folding is reduced, and the tact time is shortened.

In this method, the folding bar may be brought into contact with the glass ribbon by abutting at the same time as the time when the operation of bending the formation region of the scribe line in the glass ribbon in the vertical direction is completed. ..

By doing so, the operation of bending the glass ribbon and the operation of abutting the folding bar against the glass ribbon are performed at appropriate timings, and the folding work can be smoothly performed. Here, the above-mentioned "time equivalent to the time when the bending operation is completed" is not only the time when the bending operation is completed but also the time within 1 second before and after the time when the bending operation is completed. It also means to include. According to the knowledge of the present inventor, it is preferable to abut the folding bar against the glass ribbon immediately before the time when the operation of bending the glass ribbon is completed, so that it is before the time when the operation of bending the glass ribbon is completed. Moreover, it is preferable to abut the folding bar against the glass ribbon at a time when the difference from that time is within 1 second.

The second aspect of the present invention, which was devised to solve the above problems, is to break the glass ribbon along a scrib line extending in the width direction when cutting out a glass plate from a glass ribbon that moves downward in a vertical posture. A glass plate manufacturing apparatus including a folding bar used for the purpose and a moving means for moving the folding bar toward the glass ribbon, wherein the moving means moves the folding bar to the glass. It is characterized in that it is configured to be moved to a portion of the ribbon above the scrib line and brought into contact with the ribbon.

According to this manufacturing apparatus, when the glass ribbon is broken, the moving means brings the folding bar into contact with a portion of the glass ribbon above the scribe line. Therefore, even with this manufacturing apparatus, as in the case of the manufacturing method described above, the probability that cracks will grow up and down starting from the scribe line is reduced, and the glass is less likely to be broken or damaged.

According to the present invention, the probability of cracking or damage when breaking a glass ribbon using a folding bar is reduced, and the quality of the cut glass plate is improved and the product yield is improved.

It is a side view which shows the schematic structure of the glass plate manufacturing apparatus which concerns on embodiment of this invention. It is a front view (front view seen according to the arrow X of FIG. 1) which shows the schematic structure of the glass plate manufacturing apparatus which concerns on embodiment of this invention. It is a cross-sectional plan view cut according to the YY line of FIG. It is a top view which shows the main part of the folding bar which is a component of the glass plate manufacturing apparatus which concerns on embodiment of this invention. It is a schematic side view which shows the implementation state of the manufacturing method of the glass plate which concerns on embodiment of this invention. It is a schematic side view which shows the implementation state of the manufacturing method of the glass plate which concerns on embodiment of this invention. It is a schematic side view which shows the implementation state of the manufacturing method of the glass plate which concerns on embodiment of this invention. It is a schematic side view which shows the implementation state of the manufacturing method of the glass plate which concerns on embodiment of this invention.

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

FIG. 1 is a side view illustrating the glass plate manufacturing apparatus according to the embodiment of the present invention, and FIG. 2 is a front view of the manufacturing apparatus as viewed by an arrow X in FIG. As shown in each of these figures, the manufacturing apparatus 1 includes a scribing means S for forming a scribing line 3 extending in the width direction of the glass ribbon 2 moving downward (arrow Z direction) in a vertical posture, and a glass ribbon 2. The support means 4 for supporting the planned cutout portion 2x located below the scribe line 3 and the folding bar 5 in contact with the glass ribbon 2 are provided. Further, the manufacturing apparatus 1 includes a moving means 6 for moving the folding bar 5 in the horizontal direction toward the glass ribbon 2 and moving it backward to the retracted position. Here, when the glass ribbon 2 is broken, the moving means 6 vertically covers the peripheral portion of the scribe line 3 forming region 2s (hereinafter referred to as the scribe line forming region 2s), as shown by the solid line in FIG. In the curved state, the folding bar 5 is moved to the upper side of the scribe line 3 to bring it into contact with the scribe bar 5. The moving means 6 is composed of an air cylinder in this embodiment, but may be a feeding device such as a cylinder or a ball screw mechanism other than that.

The scribing means S includes a wheel cutter 7 forming a scribing line 3 while traveling along a width direction (in FIG. 1, a direction perpendicular to the paper surface) on the surface 2a of the glass ribbon 2 moving in the arrow Z direction, and glass. A support rod 8 that is long in the width direction is provided to support the portion of the ribbon 2 on which the wheel cutter 7 travels from the back surface 2b side. The wheel cutter 7 has a blade (edge) at a peripheral portion that rotates during traveling, and is formed in a disk shape. The support rod 8 has an abutting surface that abuts on a portion where the wheel cutter 7 travels, and protrudes from both ends in the width direction of the glass ribbon 2.

The folding bar 5 abuts on the portion of the back surface 2b of the glass ribbon 2 above the scribe line 3 by abutting, and the longitudinal side surface abutting on the back surface 2b of the glass ribbon 2 has a convex shape (for example, a semicircle). It has a contact side end 5a (shaped or curved). Here, the portion above the scribe line 3 with which the folding bar 5 abuts is a portion of the non-curved glass ribbon 2 separated from the scribe line 3 by a predetermined distance L1 upward. The predetermined distance L1 is 5 mm or more and less than 70 mm. Further, considering that the glass ribbon 2 has an effective region (region of the product glass plate), the predetermined distance L1 is 5 mm or more and less than the distance from the scribe line 3 to the lower end of the effective region. May be good. In this case, the predetermined distance L1 is 5 mm or more and less than 20 mm in consideration of the effective region of the glass ribbon 2 in this embodiment. Both ends of the folding bar 5 in the width direction are located inside the width direction of the glass ribbon 2 with respect to both ends in the width direction.

FIG. 3 is a cross-sectional plan view cut along the YY line of FIG. As shown in the figure, the glass ribbon 2 has a curved shape in which the shape along the width direction (WW direction) is convex on one side (surface 2a side), and both ends in the width direction are described later. It is gripped by a pair of claws 11ax of the chuck 11a. The contact side end portion 5a of the folding bar 5 has a curved shape in which the shape along the width direction is convex on the same side as the glass ribbon 2. In this embodiment, the folding bar 5 itself also has a curved shape in which the shape along the width direction is convex on the same side as the glass ribbon 2. Further, the folding bar 5 is divided into two folding bar members 5x and 5y, and both members 5x and 5y are connected at the center position in the width direction of the folding bar 5. Both members 5x and 5y have symmetrical shapes. Therefore, both members 5x and 5y each have a contact side end portions 5xa and 5ya, and the two abutment side end portions 5xa and 5ya are connected to each other, whereby the above-mentioned folding bar 5 is applied. The tangent end 5a is formed.

FIG. 4 is an enlarged plan view of a main part showing a connecting portion of two split bar members 5x and 5y. As shown in the figure, in the connecting portion of the two folding bar members 5x and 5y, the respective end portions 5xb and 5yb on the glass ribbon 2 side are in contact with each other, and the folding bar 5 has the end portions 5xb and 5yb. Is symmetrical in the width direction with respect to the center. Further, the gap SP between the facing end faces 5xc and 5yc of the two split bar members 5x and 5y gradually expands toward the side opposite to the glass ribbon 2 side. The two folding bar members 5x and 5y are connected so that the angle formed by the two members 5x and 5y can be adjusted. The angle adjustment mechanism MC for adjusting the angle is applied to both members 5x and 5y and has a long hole HL, and is inserted into the long hole HL of the plate PL and is inserted into both members 5x and 5y. It has bolts Bx and By that are screwed in. According to this angle adjusting mechanism MC, the bolts Bx and By are loosened, the angles of both members 5x and 5y are changed with the contact portions of both ends 5xb and 5yb as fulcrums, and then the bolts Bx and By are tightened. Then, the angles of both members 5x and 5y can be adjusted. The angles of both members 5x and 5y are adjusted each time the curvature of the curved shape of the glass ribbon 2 changes.

Again, with reference to FIGS. 1 and 2, the components of the manufacturing apparatus 1 will be described. A suction nozzle 9 for sucking glass powder generated by folding is arranged at a position on the back side of the scribe wire 3 of the glass ribbon 2. The suction nozzle 9 is provided with an opening 9a facing the surface 2a of the glass ribbon 2, and sucks glass powder through the opening 9a by the operation of a negative pressure generator (not shown) such as a negative pressure pump.

The support means 4 includes an arm 10 extending along the longitudinal direction of the glass ribbon 2 and a chuck group 11 including a plurality of (five in this embodiment) chucks 11a attached to the arm 10 at intervals from each other. I have. The arm 10 and the chuck group 11 are arranged on one side and the other side in the width direction of the glass ribbon 2, respectively. Each of the plurality of chucks 11a includes a pair of claws 11ax that grip the glass ribbon 2 to be cut out 2x in the thickness direction.

Further, the support means 4 is configured to change the posture from the basic posture shown by the chain line in FIG. 1 to the inclined posture shown by the solid line in FIG. 1 while supporting the planned cutout portion 2x. This change in the posture of the support means 4 is made by the rotational operation of the support means 4 centered on the vicinity of the position of the folding bar 5 (the position shown by the solid line in FIG. 1). Further, the posture of the support means 4 is changed while moving downward at the same speed as the glass ribbon 2. Then, the support means 4 bends the peripheral portion of the scribe line forming region 2s in the glass ribbon 2 so as to be convex on the surface 2a side in the vertical direction by the above rotation operation. Such a rotational operation of the support means 4 is performed at the same timing as the movement of the moving means 6 to move the folding bar 5 toward the glass ribbon 2. Then, the moving means 6 abuts the folding bar 5 against the glass ribbon 2 at the same time as the time when the rotational operation of the supporting means 4 is completed. Specifically, the moving means 6 thrusts the folding bar 5 into the glass ribbon 2 within 1 second before and after the time when the operation of bending the glass ribbon 2 is completed by completing the rotational operation of the supporting means 4. It is configured to hit. In this embodiment, the moving means 6 attaches the folding bar 5 to the glass ribbon 2 immediately before the time when the rotational operation of the supporting means 4 is completed, that is, before that time and within 1 second of that time. It is configured to hit. As shown in FIG. 3, the glass ribbon 2 is curved so that the surface 2a side is convex in the width direction while the support means 4 supports the planned cutout portion 2x.

In this embodiment, the arm 10 and the chuck group 11 arranged on one side in the width direction of the glass ribbon 2 and the arm 10 and the chuck group 11 arranged on the other side in the width direction of the glass ribbon 2 are arranged. It is configured to rotate as a unit. However, the arms 10 and the chuck group 11 on both sides may each rotate individually.

Of the components of the manufacturing apparatus 1, the folding bar 5 and the support rod 8 are mounted on a first housing (not shown) arranged on the back surface 2b side of the glass ribbon 2, and also have a wheel cutter 7 and suction. The nozzle 9 is mounted on a second housing (not shown) arranged on the surface 2a side of the glass ribbon 2. The first housing and the second housing can each move in the vertical direction. As a result, the split bar 5 and the support rod 8 are configured to move up and down together with the first housing while maintaining their relative positional relationship in the vertical direction. Further, the wheel cutter 7 and the suction nozzle 9 are configured to move up and down together with the second housing while maintaining their relative positional relationship in the vertical direction.

Each of the first housing and the second housing can move downward following the glass ribbon 2 at the same speed as the downward movement speed of the glass ribbon 2. As a result, each of the split bar 5, the support rod 8, the wheel cutter 7, and the suction nozzle 9 moves downward following the glass ribbon 2 of the first housing and the second housing. The glass ribbon 2 is configured to exert its own function while moving downward at the same speed as the moving speed of the glass ribbon 2. Similarly, the support means 4 is also configured to exhibit its own function while moving downward at the same speed as the moving speed of the glass ribbon 2. Therefore, each of the above-mentioned components of the manufacturing apparatus 1 is in a state where the relative speed along the vertical direction with respect to the glass ribbon 2 is zero when exhibiting its own function.

Of the above components, the folding bar 5, the support rod 8, the wheel cutter 7, and the suction nozzle 9 have operating positions for exerting their own functions, as shown by arrows in FIG. 1, respectively. It is configured to move along the thickness direction of the glass ribbon 2 between the retracted position for retracting away from the glass ribbon 2. The movement of each of these components along the thickness direction is performed while moving downward at the same speed as the glass ribbon 2. The folding bar 5, the wheel cutter 7, the support rod 8, and the suction nozzle 9 have an operating position at a position shown by a solid line in FIG. 1 and a retracted position at a position shown by a chain line in FIG.

At a position above the scribe means S on the surface 2a side of the glass ribbon 2, a regulating roller 12 that serves as a fulcrum when the glass ribbon 2 is bent by the rotational operation of the support means 4 is arranged. When the glass ribbon 2 is broken, tension is applied to the glass ribbon 2 (the peripheral portion of the scribe line forming region 2s) between the support means 4 and the regulation roller 12. Therefore, when the folding bar 5 abuts on the glass ribbon 2, tension is applied to the abutting portion of the glass ribbon 2.

Next, a method of manufacturing a glass plate using the above-mentioned manufacturing apparatus 1 will be described with reference to FIGS. 5 to 8.

In the method for manufacturing a glass plate according to the present embodiment, the glass ribbon 2 to be folded is formed by, for example, a down draw method (overflow down draw method or the like). 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 that can be curved by the action of an external force.

The method for manufacturing a glass plate according to the present embodiment is roughly divided into a scribe step of forming a scribe wire 3 on a glass ribbon 2 and a glass plate by folding the glass ribbon 2 along the scribe wire 3 formed in the scribe step. It is equipped with a folding process to cut out.

In the scribe step, as shown in FIG. 5, first, the wheel cutter 7 and the support rod 8 are moved from the retracted position to the operating position in a state where the plurality of chucks 11a of the supporting means 4 support the planned cutting portion 2x. Next, the wheel cutter 7 moved to the operating position is run along the width direction on the surface 2a of the glass ribbon 2 to form the scribe line 3.

After the scribe step is completed as described above, the wheel cutter 7 and the support rod 8 are moved from the operating position to the retracted position. In this case, the plurality of chucks 11a of the support means 4 continue to support the planned cutting portion 2x even after the completion of the scribe step. Here, when the scribe process is completed, the wheel cutter 7 and the support rod 8 are in the same height position as the scribe wire 3. In preparation for executing the folding step from this state, both the first housing and the second housing move relatively upward with respect to the glass ribbon 2. As a result, as shown in FIG. 6, the folding bar 5 is held at a height position upward by a predetermined distance L1 from the scribe line 3, and the suction nozzle 9 is at the same height as the scribe line 3. Retained in position.

In the folding step, as shown in FIG. 7, the support means 4 is rotated in the direction indicated by the arrow C while the folding bar 5 and the suction nozzle 9 are held in the retracted positions. As a result, the posture of the support means 4 begins to change from the basic posture to the inclined posture, and the peripheral portion of the scribe line forming region 2s of the glass ribbon 2 begins to bend so that the surface 2a side becomes convex. At this time, since the portion of the glass ribbon 2 above the scribe line forming region 2s is supported by the regulation roller 12, tension is applied to the peripheral portion of the scribe line forming region 2s. While the rotation operation of the support means 4 is being performed, the moving means 6 moves the folding bar 5 in the horizontal direction toward the glass ribbon 2. In the same manner, the suction nozzle 9 also moves toward the glass ribbon 2. Then, when the angle α of the support means 4 with respect to the vertical line reaches a preset inclination angle, that is, immediately before the rotational operation of the support means 4 is completed, the moving means 6 causes the end of the folding bar 5 on the contact side. 5a is abutted against the back surface 2b of the glass ribbon 2. In this case, the portion where the contact side end portion 5a of the folding bar 5 abuts on the back surface 2b of the glass ribbon 2 is separated from the scribe line 3 upward by a predetermined distance L1 (strictly speaking, a predetermined distance L1 shown in FIG. 6). It is a part of the glass. The mode when the contact side end portion 5a of the folding bar 5 is abutted against the glass ribbon 2 is the mode shown by the solid line in FIG. 1 in the side view and the mode shown in FIG. 3 in the plan view. .. In this case, the contact-side end portion 5a of the folding bar 5 has its central portion in the width direction abutted against the back surface 2b of the glass ribbon 2 prior to other portions (peripheries of both ends in the width direction, etc.).

By such an operation, the glass ribbon 2 is broken along the scribe line 3, and the planned cutout portion 2x is cut out as the glass plate 2y. Immediately after this folding is performed, as shown in FIG. 8, the split end surface 2z at the lower end of the glass ribbon 2 and the split end surface 2yz at the upper end of the glass plate 2y do not come into contact with each other, and the folding bar 5 Also does not come into contact with any of those 2 (2z) and 2y (2yz). The glass powder generated by this folding is sucked by the suction nozzle 9.

According to the present embodiment in which the folding is performed as described above, the following effects can be obtained.

In the present embodiment, when the glass ribbon 2 is folded along the scribe line 3, the fold bar 5 abuts on the portion above the scribe line 3, so that the contact position of the fold bar 5 and the scribe line 3 Is separated from the forming position in the vertical direction. Therefore, the phenomenon that the crack propagates up and down starting from the scribe line 3 disappears, and the glass is less likely to be broken or damaged. As a result, the quality of the cut out glass plate 2y can be improved and the product yield can be improved. Here, if the folding bar 5 is brought into contact with the scribing line 3 at the same height position, the recoil (swinging) of the glass plate 2y after the folding becomes large, and the folding bar 5 is contacted again. As a result, the glass plate 2y may be damaged, or the split cross section 2z may come into contact with the folding bar 5 to cause cracking or the like. However, in this embodiment, such a defect is effectively avoided.

In the present embodiment, the folding bar 5 is abutted against a portion of the glass ribbon 2 that is separated from the scribe line 3 by a predetermined distance L1 above. Here, when the predetermined distance L1 is 5 mm or more and less than 70 mm, the probability that the crack will grow up and down with the scribe line 3 as the starting point is surely reduced, and the folding bar 5 thrusts the glass ribbon 2 into the glass ribbon 2. The applying force can be appropriately applied to the scribe line 3. More specifically, if the lower limit of the predetermined distance L1 is less than 5 mm, it becomes difficult to sufficiently reduce the probability that the crack will grow up and down starting from the scribe line 3, which causes the glass to break or be damaged. There is a risk. Further, when the upper limit value of the predetermined distance L1 is 70 mm or more, it becomes difficult to appropriately apply the abutting force of the folding bar 5 to the glass ribbon 2 on the scribe line 3, which causes a cutting error or the like. There is a risk. However, with the configuration here, such a problem is unlikely to occur.

In addition to the above case, when the predetermined distance L1 is 5 mm or more and the distance from the scrib line 2 to the lower end of the effective region of the glass ribbon 2 is set, the effective region of the glass ribbon 2 (with the product glass plate). It is possible to avoid problems such as scratches caused by the abutting of the folding bar 5 on the area), which can contribute to the improvement of the quality of the product glass plate.

In the present embodiment, the folding bar 5 is abutted against the glass ribbon 2 in a state where the peripheral portion of the formation region 2s of the scribe line 3 in the glass ribbon 2 is curved in the vertical direction. Complete. As a result, the variation or variation in the time required for splitting is reduced, and the tact time is shortened.

In the present embodiment, the operation of bending the glass ribbon 2 in order to abut the folding bar 5 against the glass ribbon 2 at the same time (immediately before) as the time when the operation of bending the glass ribbon 2 in the vertical direction is completed. The operation of abutting the folding bar 5 against the glass ribbon 2 is performed at an appropriate timing, and the folding work can be smoothly performed.

Although the method for manufacturing a glass plate according to an embodiment of the present invention has been described above, the present invention is not limited to this, and various variations are possible without departing from the gist thereof.

In the above embodiment, the folding bar 5 is abutted against the glass ribbon 2 in a state where the glass ribbon 2 is curved in the vertical direction. However, after the folding bar 5 is brought into contact with the glass ribbon 2, the glass is used. The ribbon 2 may be curved in the vertical direction to perform folding. In this case, the operation of abutting the folding bar 5 against the glass ribbon 2 is not performed.

In the above embodiment, the support means 4 supports the planned cutout portion 2x of the glass ribbon 2 by the pair of claws 11ax of the chuck 11a, but instead of this, the surface of the scheduled cutout portion 2x or The configuration may be such that the planned cutout portion 2x is supported by a suction pad that sucks the back surface.

In the above embodiment, the folding is performed by bending the peripheral portion of the scribe line forming region 2s of the glass ribbon 2, but in other words, even when only the scribe line forming region 2s is curved. If at least the scribe line forming region 2s is curved, the folding can be performed in the same manner.

1 Glass plate manufacturing equipment 2 Glass ribbon 2a Glass ribbon front surface 2b Glass ribbon back surface 2s Scrivener line forming region (scribe line forming region)
2x Scheduled cutout 2y Glass plate 3 Scrivener line 4 Support means 5 Folding bar 6 Transportation means L1 Distance from scribe line to the upper side S Scrivener means

Claims (6)

It is a method of manufacturing a glass plate that cuts out a glass plate from the glass ribbon by folding the glass ribbon that moves downward in a vertical posture along a scrib line extending in the width direction of the glass ribbon using a folding bar. hand,
A method for manufacturing a glass plate, characterized in that the folding bar is brought into contact with a portion of the glass ribbon above the scribe line and the glass ribbon is folded along the scribe line. The method for manufacturing a glass plate according to claim 1, wherein the folding bar is brought into contact with a portion of the glass ribbon that is 5 mm or more and less than 70 mm above the scribe line. The method for manufacturing a glass plate according to claim 1, wherein the folding bar is brought into contact with a portion of the glass ribbon that is 5 mm or more upward from the scribe line and is distant from the lower end of the effective region. .. The invention according to any one of claims 1 to 3, wherein the folding bar is brought into contact with the glass ribbon by abutting in a state where the formation region of the scribe line in the glass ribbon is curved in the vertical direction. How to make a glass plate. 4. The fourth aspect of the present invention is characterized in that the folding bar is brought into contact with the glass ribbon by abutting at the same time as the time when the operation of bending the scribe line forming region in the glass ribbon in the vertical direction is completed. The method for manufacturing a glass plate according to the description. A folding bar used to fold the glass ribbon along a scrib line extending in the width direction when cutting out a glass plate from a glass ribbon moving downward in a vertical posture, and the folding bar toward the glass ribbon. It is a glass plate manufacturing device equipped with a means of transportation for moving the ribbon.
The moving means is a glass plate manufacturing apparatus characterized in that the folding bar is moved to a portion of the glass ribbon above the scribe line and brought into contact with the moving bar.

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