JP7636713B2 - Glass plate manufacturing apparatus and method - Google Patents

Description

The present invention relates to an improved glass sheet manufacturing apparatus and method.

As is well known, the most widely used methods for manufacturing glass sheets include downdraw methods such as the overflow downdraw method, the slot downdraw method, and the redraw method, and the float method. Examples of glass sheet manufacturing processes using these methods include the following:

First, a glass ribbon is continuously formed from molten glass. At this time, portions called ears, which are thicker at both ends of the glass ribbon in the width direction compared to the center portion, are formed. Next, the glass ribbon is cut in the width direction at predetermined lengths, and glass plates that will become the base of product glass plates are repeatedly cut out from the glass ribbon. Next, unnecessary portions (portions that do not become products), including the ears, are cut and separated from these glass plates. After that, the glass plates from which the unnecessary portions have been separated are subjected to various processes such as grinding, polishing, and cleaning to produce product glass plates.

Here, when a glass sheet is manufactured using the down-draw method, the glass ribbon after molding is in a vertical position (vertical position). Therefore, from the viewpoint of saving planar space, the glass sheet cut from the vertically oriented glass ribbon may be transported in the vertical position while cutting off the unnecessary parts from the glass sheet on the transport path. Patent Document 1 discloses a method for efficiently manufacturing glass sheets by dropping and discarding the cut-off unnecessary parts from a cutting chamber where the unnecessary parts are cut off into a disposal chamber provided on a floor below. When this method is used, glass powder is generated from the unnecessary parts that have fallen into the disposal chamber and floats in the disposal chamber. To prevent the glass powder from adhering to the glass sheet, the air pressure in the disposal chamber is kept lower than the air pressure in the cutting chamber.

JP 2020-176038 A

When using the above manufacturing method, there was a problem in that the difference in air pressure between the cutting chamber and the disposal chamber would generate an air current flowing from the cutting chamber to the disposal chamber, causing the glass plate to shake during transportation. If the glass plate shakes too much, it may collide with surrounding structures and be damaged.

The present invention was developed in consideration of the above circumstances, and aims to reduce the shaking of the glass plate caused by the airflow from the cutting chamber to the disposal chamber, thereby preventing the glass plate from being damaged.

The glass plate manufacturing device invented to solve the above problem includes a conveying mechanism that conveys a vertically oriented glass plate along a conveying path, a cutting chamber provided in the middle of the conveying path, a cutting mechanism that cuts and separates unnecessary parts from the glass plate along the conveying path, a holding member that can hold the unnecessary parts before and after cutting, a waste chamber provided below the cutting chamber and maintained at a lower air pressure than the cutting chamber, and a waste outlet for discharging the unnecessary parts after cutting that fall when the holding member is released into the waste chamber and discarding them, and is characterized in that a shielding member is provided to block the airflow from the conveying path toward the waste outlet. Since the waste chamber is maintained at a lower air pressure than the cutting chamber, an airflow is generated from the cutting chamber through the waste outlet to the waste chamber. This airflow may cause the glass plate conveyed along the conveying path to shake, colliding with surrounding structures and causing damage. According to the above configuration, the airflow from the conveying path toward the waste chamber can be blocked by the shielding member, thereby reducing the shaking of the glass plate and preventing damage.

In the above configuration, it is preferable that the shielding member is a windbreak member that is disposed between the transport path and the disposal outlet and extends in the vertical direction. With this configuration, the windbreak member can be disposed so as to follow the glass plate in a vertical position, and shaking of the glass plate can be effectively reduced.

In the above configuration, the waste outlet includes an upstream waste outlet located on the upstream side of the conveying path and a downstream waste outlet located on the downstream side of the conveying path, and it is preferable that the first windbreak member, which is the windbreak member, is arranged on the upstream side of the conveying path among the upstream waste outlets, the downstream side of the conveying path is blocked by a first blocking member among the upstream waste outlets, the second windbreak member, which is the windbreak member, is arranged on the downstream side of the conveying path among the downstream waste outlets, and the upstream side of the conveying path is blocked by a second blocking member among the downstream waste outlets. According to this configuration, by providing the upstream waste outlet and the downstream waste outlet, the unnecessary parts cut from the upstream side and the downstream side of the glass sheet can be discarded in parallel. In addition, by arranging the first windbreak member on the upstream side and the second windbreak member on the downstream side, it is possible to prevent the first windbreak member and the second windbreak member from obstructing the movement of the unnecessary parts onto the waste outlet. Furthermore, by blocking part of the waste port with the first and second blocking members, the airflow from the cutting chamber to the waste chamber can be blocked, and the shaking of the glass plate can be more reliably reduced.

In the above configuration, it is preferable that the shielding member is a shutter that opens and closes the waste opening. With this configuration, by closing the waste opening with the shutter, it is possible to block the air flow from the cutting chamber through the waste opening to the waste chamber, and it is possible to more reliably reduce the shaking of the glass plate.

In the above configuration, it is preferable that the disposal outlet has a slide-like guide member that is inclined so as to guide the unnecessary part to the disposal outlet. With this configuration, when the unnecessary part after cutting is dropped into the disposal outlet and discarded, the unnecessary part moves along the slide-like guide member, so that the unnecessary part can be reliably delivered to the disposal outlet.

In the above configuration, the thickness of the glass plate is preferably 0.35 mm or less. The thinner the glass plate, the greater the vibration caused by the air current and the greater the risk of breakage in the event of a collision. With this configuration, the effect of the invention, which reduces the vibration of the glass plate and prevents breakage, is significantly manifested.

The method for manufacturing a glass plate according to the present invention includes a conveying step of conveying a vertically oriented glass plate along a conveying path, a cutting step of cutting and separating an unnecessary portion from the glass plate in a cutting chamber provided midway along the conveying path, and a disposal step of dropping the unnecessary portion after cutting into a disposal outlet using a holding member capable of holding the unnecessary portion before and after cutting, and disposing of the unnecessary portion in a disposal chamber whose air pressure is kept lower than that of the cutting chamber, and is characterized in that the glass plate is conveyed along the conveying path in the conveying step in a state in which the airflow from the conveying path toward the disposal outlet is blocked by a blocking member. With this configuration, the shaking of the glass plate can be reduced by blocking the airflow from the cutting chamber toward the disposal chamber, and damage to the glass plate can be prevented.

According to the present invention, it is possible to reduce the shaking of the glass plate caused by the air flow from the cutting chamber to the disposal chamber, thereby preventing the glass plate from being damaged.

FIG. 1 is a cross-sectional view showing an apparatus and method for producing a glass sheet. FIG. 2 is a plan view showing the breaking mechanism and the disposal outlet when the cutting step is performed. FIG. 3 is a front view showing the breaking mechanism and the disposal outlet when the cutting step is performed. FIG. 4 is a plan view showing the breaking mechanism and the disposal port when the disposal step is performed. FIG. 5 is a front view showing the breaking mechanism and the disposal port when the disposal step is performed. FIG. 6 is a perspective view showing the disposal port.

One embodiment of the glass plate manufacturing apparatus according to the present invention will be described below with reference to the attached drawings. Note that, in the drawings referred to in the description of the embodiment, the X directions, the Y directions, and the Z directions are the same. Also, the X direction, the Y direction, and the Z direction are perpendicular to each other.

As shown in FIG. 1, the manufacturing device 1 includes a cutting chamber 2, a disposal chamber 3, and a transport mechanism 4 that transports the glass sheet G in a transport direction D along a transport path R (see FIG. 2 described below). The manufacturing device 1 is installed in a multi-story building, and the cutting chamber 2 is located on an upper floor of the disposal chamber 3. This manufacturing device 1 is configured to cut and separate unnecessary parts G2 that cannot be made into products from the glass sheet G in the cutting chamber 2, and to drop the unnecessary parts G2 after cutting into the disposal chamber 3 for disposal.

Here, the glass sheet G has an upstream unnecessary part G21 located on the upstream side in the conveying direction D, a downstream unnecessary part G22 located on the downstream side, and a product part G1 that will become a product different from these. In the following description, the upstream unnecessary part G21 and the downstream unnecessary part G22 will be distinguished from each other. However, for the description common to the upstream unnecessary part G21 and the downstream unnecessary part G22, they will not be distinguished from each other and will simply be referred to as the unnecessary part G2. The upstream unnecessary part G21 is the part that becomes the rear part of the glass sheet G during conveyance, and the downstream unnecessary part G22 is the part that becomes the front part of the glass sheet G during conveyance. The part that exists between these upstream unnecessary part G21 and downstream unnecessary part G22 is the product part G1. Each of the unnecessary parts G2 includes a part called an ear part that is thicker than other parts. However, this is not limited, and there are cases where the unnecessary part G2 does not include an ear part. In addition, it is preferable that the glass sheet G has a thickness of 0.35 mm or less. The thinner the glass sheet G, the greater the vibration of the glass sheet G caused by the airflow from the cutting chamber 2 through the waste outlet 7 to the waste chamber 3, and the greater the risk of breakage in the event of a collision, so the effect of the present invention in blocking the airflow becomes more pronounced.

The cutting chamber 2 is provided midway along the transport path R and has a ceiling wall 21, a floor wall 22, and a side wall 23. The floor wall 22 is formed with a waste port 7 for discharging the unnecessary part G2 after cutting into the waste chamber 3 for disposal. The cutting chamber 2 and the waste chamber 3 are spatially connected through the waste port 7.

The disposal chamber 3 has a ceiling wall 31, a floor wall 32, and a side wall 33. A box-shaped storage container 34 is disposed on the floor wall 32 for storing the unnecessary parts G2 that fall from the cutting chamber 2. This storage container 34 is disposed directly below the disposal port 7.

The air pressure inside the disposal chamber 3 is adjusted to be lower than that inside the cutting chamber 2. This prevents glass powder generated from the unwanted parts G2 that have fallen into the disposal chamber 3 from flowing into the cutting chamber 2. In addition, the difference in air pressure between the cutting chamber 2 and the disposal chamber 3 generates an air current that flows from the cutting chamber 2 through the disposal port 7 to the disposal chamber 3.

A scribing chamber R1 is provided upstream of the cutting chamber 2 in the conveying direction D, and an inspection chamber R2 is provided downstream of the cutting chamber 2 in the conveying direction D. The scribing chamber R1 and the inspection chamber R2 are provided midway along the conveying path R. The scribing chamber R1 and the cutting chamber 2, and the cutting chamber 2 and the inspection chamber R2 are separated by partition walls (not shown). Slit-shaped openings are provided in these partition walls to allow the glass sheet G being conveyed to pass through. The slit-shaped openings can be opened and closed by a shutter.

The transport mechanism 4 is equipped with multiple gripping members 41 that grip the upper edge of the glass sheet G (the upper edge of the product part G1). The multiple gripping members 41 are capable of moving along rails (not shown) that extend in the X direction. This makes it possible to transport the glass sheet G in the X direction (the direction along the surface of the glass sheet G) while it is suspended and supported by the multiple gripping members 41. As the glass sheet G is transported, it is carried in and out of the scribing chamber R1, the cutting chamber 2, and the inspection chamber R2.

The cutting mechanism 5 includes a scribing mechanism 51 and a breaking mechanism 52.

The scribing mechanism 51 is a mechanism for forming a scribe line S, which is the starting point for cutting, on the glass sheet G that is transported into the scribing chamber R1 by the transport mechanism 4. The scribing mechanism 51 is equipped with a scribing wheel 511 that forms the scribe line S by rolling on the front surface of the glass sheet G along the boundary L between the unnecessary portion G2 and the product portion G1, and an auxiliary bar 512 that supports the glass sheet G from the back side and assists the scribing wheel 511 in forming the scribe line S. After the scribe line S is formed, the glass sheet G is transported out of the scribing chamber R1 by the transport mechanism 4, and then transported downstream of the transport path R to be transported into the cutting chamber 2.

As shown in Figures 1 to 3, the bending and splitting mechanism 52 is a mechanism for bending and splitting the glass sheet G on which the scribe line S has been formed, and is arranged in the cutting chamber 2. The bending and splitting mechanism 52 is equipped with a pair of support bars 521, 521 that sandwich and support the vicinity of the scribe line S in the product part G1 of the glass sheet G from the front and back, and a bending and splitting bar 522 that applies bending stress by curving the peripheral part of the scribe line S so that the front side is convex as the unnecessary part G2 of the glass sheet is pressed from the front side to the back side. Note that, as will be described in detail later, the glass sheet G (glass sheet G consisting only of the product part G1) after being separated from the unnecessary part G2 is transported downstream of the transport path R while avoiding collision with the unnecessary part G2 after cutting, and is transported out of the cutting chamber 2 and transported into the inspection chamber R2.

The holding member 6 is provided alongside the bending mechanism 52. This holding member 6 is capable of holding the unnecessary portion G2 in a vertical position before and after cutting. As a result, the holding member 6 is configured to hold the unnecessary portion G2 of the glass sheet G brought into the cutting chamber 2 before bending the glass sheet G, and to hold the unnecessary portion G2 during and after bending. During bending, the holding member 6 moves along the arrow A to the disposal position Pd while rotating around the scribe line S in association with the bending bar 522 pushing in the unnecessary portion G2.

The holding member 6 is provided with a plurality of suction sections 61 capable of suction-holding the unnecessary parts G2 in order to hold the unnecessary parts G2. These suction sections 61 are arranged in a vertical line in multiple tiers. Each suction section 61 is connected to a negative pressure generating device (e.g., a vacuum pump) not shown, and is capable of suction-holding the unnecessary parts G2 of the glass plate G from the back side as the negative pressure generating device operates. Furthermore, as shown in Figures 4 and 5, when the unnecessary parts G2 are dropped and discarded into the disposal chamber 3 through the disposal port 7, the suction section 61 is capable of injecting an adsorption destruction gas Gs (e.g., air) as a vacuum destruction gas in a direction flowing from the back side to the front side of the unnecessary parts G2.

In this embodiment, in order to cut the upstream unnecessary part G21 and the downstream unnecessary part G22 in parallel, the manufacturing device 1 has two scribing mechanisms 51, two folding mechanisms 52, and two holding members 6. In addition, in order to discard the upstream unnecessary part G21 after cutting and the downstream unnecessary part G22 in parallel, the manufacturing device 1 has two waste outlets 7. Hereinafter, the waste outlet 7 located upstream on the conveying path R will be referred to as the upstream waste outlet 71, and the waste outlet 7 located downstream will be referred to as the downstream waste outlet 72.

2, the waste outlet 7 is arranged in a state separated from the conveying path R of the glass sheet G in a plan view (as viewed from the Z direction). As shown in FIGS. 2, 4, and 6, an upstream guide member 821 and an upstream guide member 811 for guiding the falling upstream unnecessary part G21 to the waste outlet 7, a first blocking member 91 for blocking a part of the upstream waste outlet 71, and a first windbreak member 101 as a shielding member for blocking the air flow toward the upstream waste outlet 71 are installed on the upstream waste outlet 71. Also, a downstream guide member 822 and a downstream guide member 812 for guiding the falling downstream unnecessary part G22 to the waste outlet 7, a second blocking member 92 for blocking a part of the downstream waste outlet 72, and a second windbreak member 102 as a shielding member for blocking the air flow toward the downstream waste outlet 72 are installed on the downstream waste outlet 72.

In the following description, the upstream waste outlet 71 and the downstream waste outlet 72 will be distinguished from each other. However, in the description common to the upstream waste outlet 71 and the downstream waste outlet 72, they will not be distinguished from each other and will simply be referred to as waste outlet 7. Similarly, in the description common to the upstream guide member 821 and the downstream guide member 822, the upstream guide member 811 and the downstream guide member 812, the first windbreak member 101 and the second windbreak member 102, and the first blocking member 91 and the second blocking member 92, they will not be distinguished from each other and will be referred to as guide member 82, guide member 81, windbreak member 10, and blocking member 9.

The guide member 82 is installed so as to extend in the vertical direction (Z direction), has an L-shaped cross section perpendicular to the vertical direction, and has its lower end fixed along the edge of the waste outlet 7. The upper end of the guide member 82 is located at approximately the same height as the upper end of the unnecessary part G2 before it falls. However, this is not limited, and the upper end of the guide member 82 may be lower or higher than the upper end of the unnecessary part G2 before it falls. Here, the upstream guide member 821 is fixed to the upstream side and the side farther from the transport path R of the rectangular upstream waste outlet 71. The downstream guide member 822 is fixed to the downstream side and the side farther from the transport path R of the rectangular downstream waste outlet 72.

The guide member 81 has a slide shape that is inclined so as to guide the unnecessary part G2 after cutting to the disposal port 7. The inclination angle is preferably 35° or more and 45° or less with respect to the vertical direction. In addition, although the guide member 81 has an inclined flat shape in this embodiment, it may have a curved shape. Here, the upstream guide member 811 is inclined so as to become lower toward the upstream side. Also, the downstream guide member 812 is inclined so as to become lower toward the downstream side. The guide member 82 and the guide member 81 allow the unnecessary part G2 to be dropped and discarded to be accurately placed in the disposal port.

The blocking member 9 is a flat member that blocks a portion of the waste outlet 7 and is fixed to the edge of the waste outlet 7. By blocking a portion of the waste outlet 7, the blocking member 9 limits and narrows the area in which airflow toward the waste outlet 7 occurs. It also increases the pressure loss at the waste outlet 7 and reduces the flow rate of airflow from the cutting chamber 2 through the waste outlet 7 to the waste chamber 3. The blocking member 9 may be configured integrally with the guide member 81. Here, the first blocking member 91 blocks the downstream side of the upstream waste outlet 71. In addition, the second blocking member 92 blocks the upstream side of the downstream waste outlet 72.

The windbreak member 10 is installed between the waste outlet 7 and the transport path so as to extend in the vertical direction. The windbreak member 10 has a rectangular cross-sectional shape perpendicular to the vertical direction, and its lower end is fixed to the edge of the waste outlet 7 (the side closer to the transport path R). The upper end of the windbreak member 10 may be lower than the upper end of the guide member 82. The windbreak member 10 may also be configured as one unit with the guide member 82. Here, the first windbreak member 101 is installed only on the upstream side of the upstream waste outlet 71 (the upstream side of the side closer to the transport path R), and the unnecessary part G21 can pass over the upstream waste outlet 71 on the downstream side. The second windbreak member 102 is installed only on the downstream side of the downstream waste outlet 72 (the downstream side of the side closer to the transport path R), and the unnecessary part G22 can pass over the downstream waste outlet 72 on the upstream side. The blocking member 9 and the windbreak member 10 can effectively block the airflow from the transport path R toward the waste outlet 7.

The following describes a method for manufacturing glass sheets using the manufacturing device 1.

When the cutting process is performed, the glass sheet G on which the scribe line S has been formed is carried into the cutting chamber 2 and reaches the state shown in Figures 2 and 3, and the suction part 61 of the holding member 6 starts suction and holding the unnecessary part G2. First, while supporting the vicinity of the scribe line S in the product part G1 with a pair of support bars 521, 521, the unnecessary part G2 is pushed to the back side by the folding bar 522. In response to this, the holding member 6 is moved to the disposal position Pd along the arrow A while rotating around the scribe line S. As a result, the periphery of the scribe line S is curved so that the front side (the surface side on which the scribe line S is formed) becomes convex, and the glass sheet G is eventually folded and cut. At this point, the unnecessary part G2 is separated from the glass sheet G. The cutting process is completed as described above, and the state shown in Figures 4 and 5 is reached. The unnecessary part G2 after cutting is still held by the holding member 6.

After the cutting process is completed, the disposal process is performed to dispose of the unnecessary part G2 after cutting in the disposal chamber 3. In the disposal process, the holding member 6 first releases the suction hold of the unnecessary part G2 by the suction part 61, and injects the suction destruction gas Gs in the direction from the suction part 61 toward the guide member 82. As a result, as shown by imaginary lines in Figures 4 and 5, the unnecessary part G2 is guided toward the guide member 82 while remaining in a vertical position, and is dropped toward the disposal outlet 7. The dropped unnecessary part is guided to the disposal outlet 7 by the guide member 82 and the guide member 81, and is discharged to the disposal chamber 3. The unnecessary part G2 discharged to the disposal chamber 3 is stored in the storage container 34 arranged in the disposal chamber 3. This completes the disposal process. After the unnecessary part G2 is separated from the glass sheet G, the unnecessary part G2 is moved to the disposal position Pd away from the transport path R, and then conveyed out of the break mechanism 52 to the downstream side of the transport path R. This prevents the unwanted part G2 from colliding with the glass plate G after separation.

The above-described glass sheet manufacturing apparatus and glass sheet manufacturing method are provided with a windbreak member 10 as a windbreak wall, thereby reducing the airflow from the transport path R toward the waste outlet 7 and preventing the glass sheet G from shaking. Furthermore, the provision of an induction member 82 and a guide member 81 allows the dropped and discarded unnecessary part G2 to be reliably placed in the waste outlet 7. Furthermore, the provision of a blocking member 9 allows the flow rate of the airflow from the cutting chamber 2 through the waste outlet 7 to the waste chamber 3 to be reduced, and shaking of the glass sheet G can be more reliably prevented. As a result, for example, when the glass sheet G is transported into and out of the cutting chamber 2, the glass sheet G is less likely to collide with the slit-shaped opening, preventing damage to the glass sheet G.

The present invention is not limited to the configuration of the above embodiment, nor is it limited to the above-mentioned effects. Various modifications of the present invention are possible without departing from the gist of the present invention.

In the above embodiment, a windbreak member is used as a shielding member to block the airflow from the cutting chamber through the waste outlet to the waste chamber, but this is not limited to the above. A shutter that opens and closes the waste outlet may be used as a shielding member instead of or in addition to the windbreak member. By opening the shutter only when the unnecessary parts after cutting pass through the waste outlet and closing the shutter at other times (for example, when the glass sheet G is being transported), the airflow from the cutting chamber through the waste outlet to the waste chamber can be more efficiently reduced. This effectively prevents the glass sheet G from shaking and breaking.

In the above embodiment, the holding member holds the unnecessary part by suction using the suction part, but this is not limited. A pair of claw parts that perform opening and closing operations may be provided, and the unnecessary part may be held by closing the pair of claw parts.

In the above embodiment, the manufacturing device includes two each of the scribing mechanism, the breaking mechanism, the holding member, the disposal port, the blocking member, and the windbreak member, and the upstream unnecessary portion and the downstream unnecessary portion are cut and disposed of in parallel, but this is not limited to the above. It may also include one each of the scribing mechanism, the breaking mechanism, the holding member, the disposal port, the blocking member, and the windbreak member, and the upstream unnecessary portion and the downstream unnecessary portion are cut and disposed of separately.

In the above embodiment, a portion of the waste outlet is blocked by a blocking member, but the blocking member may be omitted and the waste outlet may be made smaller. From the viewpoint of effectively utilizing existing equipment and reducing equipment costs, it is preferable to block a portion of the waste outlet with a blocking member.

In the above embodiment, the windbreak member is provided along the edge of the waste outlet, but it is sufficient that it is disposed between the transport path and the waste outlet. From the viewpoint of efficiently blocking the airflow, it is preferable to provide the windbreak member along the edge of the waste outlet as in the above embodiment, and to connect the windbreak member to the guide member provided along the edge of the waste outlet without any gaps. In addition, it is preferable that the length L1 of the windbreak member in the transport direction is longer than the length L2 of the opening of the waste outlet in the transport direction, and it is preferable that 1.2 x L2 ≦ L1 ≦ 2.0 x L2.

The present invention can be used effectively to reduce the shaking of glass sheets caused by airflow from the cutting chamber to the disposal chamber, and to prevent breakage of the glass sheets.

Reference Signs List 1 Manufacturing device 2 Cutting chamber 3 Disposal chamber 4 Conveying mechanism 5 Cutting mechanism 6 Holding member 7 Disposal outlet 71 Upstream disposal outlet 72 Downstream disposal outlet 81 Guide member 91 First closing member 92 Second closing member 10 Windbreak wall 101 First windbreak wall 102 Second windbreak wall G Glass sheet R Conveying path

Claims (6)

A glass sheet manufacturing apparatus comprising: a conveying mechanism that conveys a glass sheet in a vertical position along a conveying path; a cutting chamber provided in the middle of the conveying path; a cutting mechanism that cuts and separates an unnecessary portion from the glass sheet on the conveying path; a holding member capable of holding the unnecessary portion before and after cutting; a waste chamber provided below the cutting chamber and maintained at a lower air pressure than the cutting chamber; and a waste port for discharging the unnecessary portion after cutting, which falls when the holding of the holding member is released, into the waste chamber and discarding it,
a shielding member is provided to block an air flow from the transport path toward the waste outlet ,
The waste outlet is spaced from the transport path in a plan view,
The glass sheet manufacturing apparatus is characterized in that the shielding member is a windbreak member that is arranged between the transport path and the waste outlet in a plan view, extends in the vertical direction, and extends in a direction along the transport path . the waste outlet includes an upstream waste outlet located on the upstream side of the transport path and a downstream waste outlet located on the downstream side of the transport path,
a first windbreak member that is the windbreak member is disposed on the upstream side of the upstream waste outlet in the transport path, and a first blocking member is disposed on the downstream side of the upstream waste outlet in the transport path,
2. The glass sheet manufacturing apparatus according to claim 1, characterized in that a second windbreak member which is the windbreak member is arranged on the downstream side of the downstream waste outlet in the conveying path, and a second blocking member is arranged on the upstream side of the downstream waste outlet in the conveying path. 3. The apparatus for manufacturing a glass sheet according to claim 1 , wherein the shielding member is a shutter that opens and closes the waste opening. 4. The apparatus for manufacturing a glass sheet according to claim 1 , wherein the waste outlet has a slide-like guide member that is inclined so as to guide the unnecessary portion to the waste outlet. 5. The apparatus for manufacturing a glass sheet according to claim 1 , wherein the glass sheet has a thickness of 0.35 mm or less. A method for manufacturing a glass sheet, comprising: a conveying step of conveying a glass sheet in a vertical position along a conveying path; a cutting step of cutting and separating an unnecessary portion from the glass sheet in a cutting chamber provided in the middle of the conveying path; and a disposal step of dropping the unnecessary portion after cutting into a disposal port using a holding member capable of holding the unnecessary portion before and after cutting, and disposing of the unnecessary portion in a disposal chamber whose air pressure is kept lower than that of the cutting chamber,
In the transport step, the glass sheet is transported along the transport path while an airflow from the transport path toward the waste outlet is blocked by a blocking member ;
The waste outlet is spaced from the transport path in a plan view,
A method for manufacturing a glass sheet, characterized in that the shielding member is a windbreak member that is arranged between the transport path and the waste outlet in a planar view, extends in the vertical direction, and also extends in a direction along the transport path .

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