JP6674138B2 - Glass plate manufacturing apparatus and glass plate manufacturing method - Google Patents

Description

  The present invention relates to a glass sheet manufacturing apparatus and a manufacturing method for manufacturing a glass sheet from molten glass, and more particularly, to a glass sheet manufacturing apparatus and a manufacturing method capable of controlling a flow rate of molten glass.

  As is well known, as a method for manufacturing a glass plate, a method using a down draw method represented by an overflow down draw method, a slot down draw method, a redraw method, and a method using a float method are widely adopted. Has been reached. Among these methods, the following can be mentioned as an example of the manufacturing process of the glass sheet using the overflow down draw method.

  First, a glass ribbon serving as a base of a glass plate is formed by a forming apparatus. In this step, the molten glass was caused to flow into the overflow groove provided at the top of the molded body formed in a wedge shape, and the molten glass overflowing to both sides from the overflow groove was caused to flow down along the side surface of the molded body. Thereafter, a plate-shaped glass ribbon is formed by fusing and integrating at the lower end of the formed body. Thereafter, the glass ribbon flowing down from the molded body is drawn down while being sandwiched from both front and back sides by a pair of rollers arranged in a plurality of upper and lower stages (see Patent Document 1). By adjusting the drawing speed at this time, the thickness of the manufactured glass plate is adjusted. Note that an ear portion having a greater thickness than other portions is formed at the width direction end of the glass ribbon.

  Next, a glass plate with ears is cut out of the glass ribbon by the first cutting device. In this step, a scribe line is formed as a starting point of cutting along the width direction of the glass ribbon by running a scribe wheel on the surface of the glass ribbon being lowered from the forming apparatus. Thereafter, the periphery of the scribe line is bent while supporting a portion to be cut out (a portion located below the scribe line in the glass ribbon), and the glass ribbon is cut by applying a bending stress (see Patent Document 2). reference). By repeatedly performing this step, a portion to be cut out is continuously cut out from the glass ribbon as a glass plate with ears.

  Next, a product size glass plate is cut out from the glass plate with ears by cutting the glass plate with ears by the second cutting device and removing the ineffective portion including the ears. In this step, a scribe line is formed as a starting point of cutting along a boundary between the ineffective portion to be removed and the portion to be cut out by running the scribe wheel on the surface of the glass plate with the ears. Thereafter, by bending the peripheral portion of the scribe line and applying a bending stress, the glass plate with ears is cut to remove an ineffective portion (see Patent Document 3). By repeatedly executing these steps, a portion to be cut out is cut out from each glass plate with ears as a product size glass plate. Thereafter, the cut product-size glass plate undergoes a polishing process, a washing process, and the like, whereby a glass plate to be a product is manufactured.

JP 2014-122124 A JP 2014-005170 A JP 2014-024720 A

  By the way, it is naturally required that a glass plate to be a product is formed to have a desired length, width, and thickness. In order to form these dimensions as desired, it is extremely important to appropriately control the flow rate of the molten glass. There are various methods of measuring and controlling the flow rate of the molten glass.For example, a part is extracted as a sample from a number of glass plates with ears cut out from a glass ribbon, and based on the measurement result of the weight of the extracted sample. There is a method of measuring and managing the flow rate of molten glass.

  However, under such a mode of management, the weight is measured only for a part of a large number of glass plates with ears, and the accuracy of the management is inevitably reduced. There was a problem. It should be noted that such a problem does not occur only when a glass sheet is manufactured using the overflow down draw method, but can also occur when a glass sheet is manufactured using another method. is there.

  SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to make it possible to control the flow rate of molten glass with high accuracy when manufacturing a glass plate from molten glass.

  The present invention was devised in order to solve the above-described problems.A molding apparatus for molding a glass ribbon having ears formed at a width direction end from inflowing molten glass, and cutting the glass ribbon in a width direction. And a first cutting device that continuously cuts the glass plate with the ears from the glass ribbon, and conveys the glass plate with the ears cut by the first cutting device along the conveyance path. And a weight measuring unit for measuring the weight of the ear-attached glass plate.

  According to such a configuration, the weight of all the glass plates with ears continuously cut out from the glass ribbon by the first cutting device can be measured by the weight measuring unit of the first transport device. This makes it possible to control the flow rate of the molten glass based on the measurement result of the weight with high accuracy.

  In the above configuration, by cutting and removing the ears from the glass plate with ears, a second cutting device that cuts out a product size glass plate from the glass plate with ears is provided, and the transport path is from the first cutting device. Preferably, the path is a path leading to the second transport device.

  With this configuration, the weight of the glass plate with ears cut out of the glass ribbon by the first cutting device is measured during the transfer of the transfer path from the first cutting device to the second cutting device. The measurement of the weight of the glass plate with the ears is performed in the production line. For this reason, in order to measure the weight of the glass plate with the ears, it is not necessary to perform a complicated operation such as carrying the glass plate with the ears out of the production line, and it is possible to efficiently manage the flow rate of the molten glass. it can.

  In the above configuration, the weight measuring unit is connected to the support unit supporting the glass plate with the ears, and the weight of the glass plate with the ears is determined based on a load applied in accordance with the support by the support unit. It is preferable to have a detection unit for detecting.

  With this configuration, the weight of the glass plate with the ears is detected by the detection unit based on the load applied in accordance with the support by the support unit, and the weight of the support unit connected to the detection unit influences the weight. In addition, it is possible to reliably eliminate the possibility that the measurement result of the weight of the glass plate with the ears may be out of order. Thereby, the weight of the glass plate with ears can be accurately measured.

  In the above configuration, the supporting portion is a chuck that suspends and supports the glass plate with ears by gripping the upper side of the glass plate with ears in the vertical position, and the detecting unit is positioned relative to the chuck. It is preferable that the load cell has a fixed positional relationship.

  According to this configuration, it is possible to place the glass plate with the ears in a suspended and supported state where the weight can be easily measured by the chuck that grips the upper side of the glass plate with the ears in the vertical posture. Further, the weight of the glass plate with ears can be detected by a load cell capable of performing precise measurement. From these things, it becomes possible to measure the weight of the glass plate with the ears more accurately. Further, since the relative positional relationship between the chuck and the load cell is fixed, the possibility that the measurement result of the weight may be deviated due to a change in the positional relationship between the chuck and the load cell can be appropriately removed. .

  In the above-described configuration, a plurality of chucks are provided along the upper side of the glass plate with ears, and a plurality of load cells corresponding to each of the plurality of chucks are provided. The detection values detected by each load cell are totaled. By this, it is configured to measure the weight of the glass plate with the ears, and the relative positional relationship between the chuck and the load cell among a plurality of sets including the chuck and the corresponding load cell as one set. Are preferably the same.

  With this configuration, since the upper side of the glass plate with ears in the vertical position is gripped by the plurality of chucks, the glass plate with ears can be stably suspended and supported. Thereby, during the conveyance of the ear-attached glass plate by the first transport device, the posture of the ear-attached glass plate is less likely to be disturbed, and the weight of the ear-attached glass plate in a stable posture is measured. be able to. As a result, the weight of the ear-attached glass plate can be measured more accurately. (A) It is configured to have a plurality of load cells corresponding to each of the plurality of chucks, and to measure the weight of the glass plate with ears by totalizing detection values detected by each load cell. And (B) Since the relative positional relationship between the chuck and the load cell is the same between a plurality of sets each including a chuck and a load cell corresponding to the chuck, more accurate weight measurement can be performed. It is possible to do. That is, if a plurality of chucks are connected to a single load cell, the relative positions of the plurality of chucks with respect to the load cell may have to be different. In such a case, the influence of the weight of each chuck on the load cell is different from each other, which is disadvantageous in performing accurate weight measurement. However, in the present configuration, as described in (B) above, since the relative positional relationship between the chuck and the load cell is the same among a plurality of sets, the influence of the weight of each chuck on the corresponding load cell. Can be made uniform in size. Then, as described in (A) above, the weights are measured by totalizing the detection values detected by each load cell, so that accurate weight measurement can be performed.

  In the above configuration, the transport path includes a transport trajectory for transporting the suspended and supported eared glass plate along the thickness direction, and measures the weight during the transport of the eared glass plate along the transport trajectory. It is preferable that it is comprised as follows.

  When transporting the glass plate with ears in the suspended and supported state in the thickness direction, the air resistance is greater than when transporting in the direction parallel to the front and back, and the glass plate with ears during transportation is Posture is easily disturbed. Therefore, when transporting in the thickness direction, the glass plate with ears can be transported only at a relatively low speed. However, measuring the weight during transport at a low speed is advantageous for accurate measurement. Therefore, if the weight is measured during the conveyance of the glass plate with the ears along the conveyance path, that is, during the conveyance of the glass plate with the ears along the thickness direction, accurate measurement results can be easily obtained.

  In the above configuration, the chuck and the load cell are connected to a cylinder mechanism having a piston rod operable in parallel with the transport trajectory, and transport the glass plate with ears suspended and supported by the chuck with the operation of the piston rod. It is preferable that it is configured to be conveyed along a track.

  With this configuration, it is possible to transport the glass plate with the ears suspended and supported by the chuck along the transport path by an extremely simple mechanism.

  In the above configuration, it is preferable that the configuration is such that the flow rate of the molten glass is calculated based on the weight of the glass plate with ears measured by the weight measuring unit.

  According to the glass plate manufacturing apparatus according to the present invention, since it is possible to measure the weight of all the glass plates with ears cut out of the glass ribbon, the molten glass can be accurately measured based on these weights. The flow rate can be calculated. As a result, the flow rate of the molten glass can be managed with high accuracy.

  In the above configuration, the transport path of the product size glass plate from the second cutting device to the downstream process includes a second transport device that transports the product size glass plate, wherein the second transport device has a weight of the product size glass plate. It is preferable to have a weight measuring unit for measuring the weight. Here, the “downstream process” means any process that takes place until the product-size glass sheet carried out of the second cutting device becomes a product.

  Here, if the flow rate of the molten glass is not properly controlled, the dimensions of the product-size glass plate cut out from the ear-equipped glass plate by the second cutting device are in a state where they are not formed as desired. There is a possibility that a glass plate having an outside dimension may be shipped as a product. However, in the transport path of the product size glass plate from the second cutting device to the downstream process, a second transport device for transporting the product size glass plate is provided, and the second transport device measures the weight of the product size glass plate. If a weight measuring unit is provided, the weight of the product size glass plate can be measured during transportation. Then, based on the measurement result of the weight, it is possible to inspect whether or not the product size glass plate is formed in a desired size. In addition, in this configuration, since the weight of the product size glass plate can be measured in the production line, the weight is measured for all the product size glass plates cut out from the glass plate with ears. Becomes possible. As a result, it is possible to reliably prevent a situation in which a glass plate having a nonstandard size is shipped as a product.

  In addition, the present invention was devised to solve the above-mentioned problems. The present invention is directed to a forming step of forming a glass ribbon having ears formed at end portions in a width direction from flowing molten glass, and cutting the glass ribbon in a width direction. That is, a first cutting step of continuously cutting out the glass plate with the ears from the glass ribbon, and a manufacturing method of a glass plate including the glass plate with the ears cut out with the execution of the first cutting step. The method is characterized in that the method includes a first transporting step of transporting the glass sheet along the transporting path, and during the execution of the first transporting step, performing a weight measuring step of measuring the weight of the glass plate with ears.

  According to such a method, it is possible to obtain the same operations and effects as described in the description of the above-described apparatus for manufacturing a glass sheet.

  ADVANTAGE OF THE INVENTION According to this invention, when manufacturing a glass plate from molten glass, it becomes possible to control the flow rate of molten glass with high accuracy.

It is a partial section front view showing the manufacturing device and the manufacturing method of the glass sheet concerning the embodiment of the present invention. It is a side view which shows the manufacturing apparatus and manufacturing method of the glass plate which concern on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the manufacturing apparatus and manufacturing method of the glass plate which concern on embodiment of this invention.

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

  As shown in FIG. 1, a glass sheet manufacturing apparatus 1 includes a forming apparatus 2 that executes a forming step of forming a glass ribbon G from a molten glass MG by an overflow down draw method, and an ear part from a glass ribbon G by split cutting. First cutting device 3 for executing a first cutting step for continuously cutting the attached glass sheet Gx, and second cutting for executing a second cutting step for cutting a product size glass sheet from the ear-attached glass sheet Gx by split cutting. An apparatus (not shown), a first transporting apparatus 4 for executing a first transporting step of transporting the glass plate Gx with ears in a transporting path T from the first cutting apparatus 3 to the second cutting apparatus, and a second cutting apparatus And a second transport device (not shown) for executing a second transport step of transporting the product size glass plate in a transport path from to the downstream process.

  The forming device 2 is arranged in a plurality of upper and lower stages (only two upper and lower stages are shown in FIG. 1) capable of sandwiching the glass ribbon G flowing down from the molded body 2a from both the front and back sides. Roller pair 2b. In addition, the glass ribbon G formed by the forming device 2 has an effective portion Ga which is located at the center in the width direction (a direction perpendicular to the paper surface in FIG. 1) and becomes a product later, and a width direction with respect to the effective portion Ga. And a pair of non-effective portions Gb to be removed, which are located outside. Further, in the non-effective portion Gb, a portion located at an end in the width direction of the glass ribbon G is formed with an ear portion Gm having a larger thickness than other portions.

  The molded body 2a has an overflow groove 2aa formed at the top for flowing the molten glass MG, and a pair of side surfaces 2ab, 2ab for flowing the molten glass MG overflowing to both sides from the overflow groove 2aa. And a lower end 2ac for fusing and integrating the molten glass MG flowing down along the side surfaces 2ab. The molded body 2a can continuously form a plate-shaped glass ribbon G from the molten glass MG fused and integrated at the lower end 2ac.

  The roller pair 2b arranged in a plurality of upper and lower stages includes a cooling roller pair 2ba, an annealing roller pair 2bb, and a support roller pair (not shown) in order from the upper side. Each of these various roller pairs can sandwich the non-effective portion Gb at one end side and the other end side in the width direction of the glass ribbon G. The cooling roller pair 2ba is a roller pair for suppressing the shrinkage of the glass ribbon G in the width direction by sandwiching the ineffective portion Gb of the glass ribbon G immediately below the molded body 2a. The annealer roller pair 2bb is a roller pair for guiding the glass ribbon G that is gradually cooled to a temperature below the strain point in a lehr (not shown). In addition, the annealer roller pair 2bb may grip the non-effective portion Gb of the glass ribbon G, or may restrict swinging along the thickness direction of the glass ribbon G without gripping. . The support roller pair supports the glass ribbon G whose temperature has decreased to around room temperature in a cooling chamber (not shown) disposed below the lehr, and determines a drawing speed at which the glass ribbon G is drawn downward. Roller pair.

  The first cutting device 3 is configured to cut out the glass plate Gx with ears from the glass ribbon G by cutting the glass ribbon G into predetermined lengths below the forming device 2. .

  The first cutting device 3 travels on the surface Gc of the glass ribbon G that has descended from the forming device 2 to form a scribe line S serving as a starting point of the splitting along the width direction of the glass ribbon G. The scribing wheel (not shown), the scribe line forming portion Gs on which the scribe line S is formed, abutment from the back surface Gd side, the fold bar 3a serving as a fulcrum of the cleave cutting, and the ear portion to be cut out A plurality of chucks 3b performing an operation for bending the scribe line forming portion Gs while supporting the attached glass plate Gx are provided.

  The scribe wheel is configured to form a scribe line S over its entire width while descending and following the descending glass ribbon G. The folding bar 3a is formed so as to be long along the width direction of the glass ribbon G, and is configured to contact the entire width of the glass ribbon G while following the descending glass ribbon G.

  The plurality of chucks 3b are arranged apart from each other along the longitudinal direction of the glass ribbon G. Each of the plurality of chucks 3b is capable of holding and releasing the ear Gm formed on the glass plate Gx with the ear, and holding the glass Gx with the ear together with the grip of the ear Gm. It is possible to support. Note that the plurality of chucks 3b are configured to be able to grip both side ends of the glass plate Gx with ears. That is, the plurality of chucks 3b are provided for gripping the ear Gm formed at one end in the width direction and for gripping the ear Gm formed at the other end in the width direction. The plurality of chucks 3b are all held by the same arm (not shown). Then, by the operation of the arm, the plurality of chucks 3b follow the descending glass ribbon G and rotate the supported ear-equipped glass plate Gx about the scribe line forming part Gs as shown by the arrow R, as shown by the arrow R. Perform an operation for causing the Thus, the scribe line forming portion Gs is bent to apply a bending stress, and the glass ribbon G is cut off in the width direction to cut out the glass plate Gx with ears.

  The plurality of chucks 3b transport the cut-out glass plate Gx with ears along the transport path T along with the movement of the arm, and then transfer the glass plate Gx with ears to the chuck 4aa provided in the first transport device 4. It is possible to deliver. After the delivery, each of the plurality of chucks 3b moves the arm to release the grip of the ear Gm on the glass plate Gx with the ear and to cut out the next glass plate Gx with the ear from the glass ribbon G. Accordingly, it is configured to return to the position before starting the cutout.

  As shown in FIGS. 2 and 3, after the first transport device 4 receives and suspends and supports the glass plate Gx with ears, the first transport device 4 receives the ears along the transport trajectory Ta, which is a part of the transport path T. It is configured to transport the attached glass plate Gx in the thickness direction. In addition, the first transport device 4 executes a weight measuring step of measuring the weight of the eared glass plate Gx by the weight measuring unit 4a during the transportation of the eared glass plate Gx along the transport path Ta. It is configured.

  The first transporting device 4 holds the upper side portion Gu of the glass plate Gx with the ear in the vertical position, and thereby the chuck 4aa as a support unit for suspending and supporting the glass plate Gx with the ear, and the hanging by the chuck 4aa. A load cell 4ab is provided as a detection unit that detects the weight of the glass plate Gx with ears based on the load applied during support. Both the chuck 4aa and the load cell 4ab constitute the weight measuring section 4a.

  The chuck 4aa and the load cell 4ab are connected in a state where the relative positional relationship is fixed, and the chuck 4aa is cantilevered by only the load cell 4ab. The load cell 4ab suspends the glass plate Gx with the ear by the chuck 4aa such that the weight of the chuck 4aa is excluded from the value detected by itself and the value is detected based only on the weight of the glass plate Gx with the ear. Before the support, the detection value is reset to zero so that the detection value becomes zero. A plurality of chucks 4aa are arranged along the upper side Gu of the glass plate Gx with ears. The plurality of chucks 4aa are arranged at equal intervals, and are arranged symmetrically with respect to the center of the upper side Gu in the longitudinal direction (the direction perpendicular to the paper surface in FIG. 2). Further, each of the plurality of chucks 4aa is connected to the corresponding load cell 4ab. The weight of the ear-attached glass plate Gx is measured by totalizing the detection values detected by the plurality of load cells 4ab. Note that the relative positional relationship between the chuck 4aa and the load cell 4ab is the same among a plurality of sets each including the chuck 4aa and the corresponding load cell 4ab.

  Each load cell 4ab is fixed to a plate 6 in a vertical posture via a bracket 5 formed in an L shape in plan view. The plate 6 is fixed to an LM block 7 that supports the plate 6 from below. The LM block 7 can move along an LM guide 9 installed on a base 8 which is in a horizontal posture (horizontal posture). The LM guide 9 extends parallel to the transport path Ta. Thus, the plate 6 is guided by the LM guide 9 via the LM block 7, so that the plate 6 can perform the forward operation and the backward operation in parallel with the transport trajectory Ta. Note that the plurality of load cells 4ab and the plurality of plates 6 fixed respectively are configured to perform a forward operation and a backward operation in synchronization with each other. The power source for operating the plate 6 is a cylinder mechanism 10 including a piston rod 10a connected to the plate 6. The cylinder mechanism 10 includes the piston rod 10a and a fixedly installed cylinder 10b. The piston rod 10a can perform an advance operation and a retreat operation in parallel with the transport path Ta with a change in the internal pressure of the cylinder 10b. Thus, the plate 6 performs a forward operation with the advance operation of the piston rod 10a, and the plate 6 performs a backward operation with the retreat operation of the piston rod 10a.

  Summarizing the above, the first transport device 4 performs the following operation when transporting the ear-attached glass plate Gx along the transport path Ta.

  First, before receiving the glass plate with ears Gx from the plurality of chucks 3b provided in the first cutting device 3, the plate 6 performs an advance operation in accordance with the advance operation of the piston rod 10a, so that the transport path Ta is moved to the end. Each chuck 4aa is made to wait at the transport start position P1, which is the upstream position. Next, when the eared glass plate Gx is transported to the transport start position P1, each chuck 4aa grips the upper side Gu of the eared glass plate Gx and suspends and supports the eared glass plate Gx. I do. Next, the plate 6 performs a retreating operation in accordance with the retreating operation of the piston rod 10a, and conveys the glass plate Gx with ears suspended and supported by each chuck 4aa in the thickness direction along the conveying path Ta. The detection values detected by the load cells 4ab during the transport along the transport trajectory Ta are totaled, and the weight of the eared glass plate Gx is measured. Finally, when the eared glass plate Gx is transported to the transport end position P2 which is the most downstream position of the transport trajectory Ta, the retreating operation of the piston rod 10a and the retreating operation of the plate 6 are stopped, and the lug is stopped. The conveyance of the attached glass plate Gx stops. In addition, the glass plate with ears Gx conveyed to the conveyance end position P2 is delivered to a conveyance device different from the first conveyance device 4, and is conveyed in the longitudinal direction of the upper side Gu by the conveyance device.

  The measured weight of the glass plate with ears Gx is used for managing the flow rate of the molten glass MG as described below, for example. That is, the total length of the glass ribbon G formed per unit time is determined from the drawing speed by the pair of support rollers provided in the forming apparatus 2. When the total length of the glass ribbon G is divided by the length of the glass plate Gx with ears per sheet (the predetermined length described above), the number of glass plates Gx with ears cut out from the glass ribbon G per unit time Is determined. The product of the number of the glass plates with ears Gx and the measured weight of the glass plate with ears Gx is calculated as the flow rate (weight) of the molten glass MG per unit time. From this calculated value, it is determined whether or not the flow rate of the molten glass MG is appropriate. The calculation of the flow rate of the molten glass MG is performed for each of the glass plates Gx with ears whose weight has been measured.

  The glass plate with ears Gx delivered to a transport device different from the first transport device 4 is transported to the second cutting device in a state of being suspended and supported by the upper edge portion Gu being gripped by the transport device. Is done. The second cutting device is configured to form a scribe line along a boundary between the effective portion Ga and the non-effective portion Gb of the ear-attached glass plate Gx held in the vertical position, and then curve the periphery of the scribe line. Have been. As a result, bending stress is applied to the periphery of the scribe line in the glass plate Gx with ears, and the glass plate Gx with ears is cut off to remove the ineffective part Gb including the ear Gm, thereby reducing the product size. It is possible to cut out a glass plate.

  The cut-out product size glass plate is conveyed while being suspended and supported by gripping the upper side Gu by the second conveying device, and the weight is measured by the weight measuring unit provided in the second conveying device. You. The second transport device is different from the point that the transport target is changed from the glass plate with ears Gx to the product size glass plate, and that the transport path is different from the glass plate with ears Gx, except for two points. Since the configuration is the same as that of the first transport device 4 described above, the description of the configuration of the second transport device that overlaps with the first transport device 4 is omitted.

  The measured weight of the product size glass plate is used, for example, as follows. That is, whether or not the measured weight of the product size glass plate is within the allowable range is inspected based on the weight of the product size glass plate formed according to the standard. Thereby, it is determined whether or not the product size glass plate is formed according to the standard.

  Hereinafter, main operations and effects of the above-described glass sheet manufacturing apparatus 1 and a method of manufacturing a glass sheet using the same will be described.

  According to the glass sheet manufacturing apparatus 1 and the glass sheet manufacturing method using the glass sheet manufacturing apparatus 1 described above, all the ear-attached glass sheets Gx continuously cut from the glass ribbon G by the first cutting apparatus 3 are used. The weight can be measured by the weight measuring unit 4a of the first transport device 4. This makes it possible to manage the flow rate of the molten glass MG based on the measurement result of the weight with high accuracy in real time.

  Here, the glass sheet manufacturing apparatus and the glass sheet manufacturing method according to the present invention are not limited to the configurations described in the above embodiments. For example, in the above embodiment, a chuck is used as a support for supporting the glass plate with ears, but a suction pad, a robot arm, or the like may be used as the support instead of the chuck. Further, in the above embodiment, the first transport device and the second transport device are configured to measure the weight of the suspended and supported glass plate with ears and the product size glass plate. The configuration may be such that the weight of these glass plates with ears and the product size glass plate in the (horizontal posture) is measured while the glass plate is supported. Further, in the above embodiment, the second transport device has the same configuration as the first transport device, but the second transport device may have a different configuration from the first transport device. For example, a configuration may be adopted in which the weight is measured while the suspended product glass plate is transported not in the thickness direction but in the longitudinal direction of the upper side. In addition, in the above embodiment, the glass ribbon is formed by the overflow down-draw method, but is not limited thereto. In addition to the overflow down draw method, the glass ribbon may be formed by a slot down draw method, a redraw method, a float method, or the like.

REFERENCE SIGNS LIST 1 Glass plate manufacturing device 2 Molding device 3 First cutting device 4 First transport device 4a Weight measuring unit 4aa Chuck 4ab Load cell 10 Cylinder mechanism 10a Piston rod G Glass ribbon Gm Ear portion Gu Upper edge portion Gx Glass plate with ear portion MG Melting Glass T Transport path Ta Transport path

Claims (10)

A forming apparatus for forming a glass ribbon having ears formed at the width direction ends from the inflowing molten glass, and by cutting the glass ribbon in the width direction, a glass plate with ears is continuously formed from the glass ribbon. A glass plate manufacturing apparatus having a first cutting device for cutting out,
A first transport device that transports the ear-equipped glass plate cut out by the first cutting device along a first transport path,
The apparatus for manufacturing a glass sheet, wherein the first transporting apparatus has a first weight measuring unit for measuring the weight of the glass sheet with ears. By cutting and removing the ears from the eared glass plate, comprising a second cutting device to cut out a product size glass plate from the eared glass plate,
The said 1st conveyance path is a path | route from the said 1st cutting device to the said 2nd cutting device , The manufacturing apparatus of the glass plate of Claim 1 characterized by the above-mentioned. The second transport path of the product size glass plate from the second cutting device to the downstream process, a second transport device for transporting the product size glass plate,
The apparatus for manufacturing a glass sheet according to claim 2, wherein the second transport device has a second weight measuring unit for measuring the weight of the product-size glass sheet. The first weight measuring unit,
A support portion for supporting the glass plate with the ears,
It is coupled with the support portion, one of the claims 1-3, characterized in that it comprises a detection unit based on a load applied along with the support by the support section for detecting the weight of the ear portion with the glass plate apparatus for manufacturing a glass sheet according to any. The supporting portion is a chuck that suspends and supports the ear-equipped glass plate by gripping an upper side of the ear-equipped glass plate in a vertical position,
The apparatus according to claim 4 , wherein the detection unit is a load cell having a fixed relative positional relationship with the chuck. A plurality of the chucks are provided along an upper side of the ear-equipped glass plate, and a plurality of the load cells corresponding to each of the plurality of the chucks,
It is configured to measure the weight of the glass plate with ears by summing the detection values detected by each load cell, and a plurality of sets of the chuck and the load cell corresponding to the chuck are paired. The apparatus for manufacturing a glass sheet according to claim 5 , wherein the relative positional relationship between the chuck and the load cell is the same. The first transport path includes a transport trajectory for transporting the suspended and supported eared glass sheet along the thickness direction, and measures the weight during transport of the eared glass sheet along the transport trajectory. The apparatus for manufacturing a glass sheet according to claim 5, wherein the apparatus is configured to perform the following. The chuck and the load cell are connected to a cylinder mechanism having a piston rod operable in parallel with the transfer track,
The glass plate according to claim 7 , wherein the chuck is configured to convey the glass plate with the ears suspended and supported by the chuck along the conveyance path in accordance with the operation of the piston rod. Manufacturing equipment. Based on the weight of the ears glass plate with the first weighing unit is determined, according to any one of claims 1 to 8, characterized in that it is configured to calculate the flow rate of the molten glass Glass plate manufacturing equipment. A forming step of forming a glass ribbon having ears formed at the width direction ends from the flowing molten glass, and by cutting the glass ribbon in the width direction, a glass plate with ears is continuously formed from the glass ribbon. A method of manufacturing a glass plate including a first cutting step of cutting out,
Including a first transporting step of transporting the edged glass plate cut out along with the execution of the first cutting step along a transport path,
A method for manufacturing a glass sheet, comprising performing a weight measuring step of measuring the weight of the glass sheet with the ears during the execution of the first transporting step.

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