TWM521625U - Apparatus for manufacturing glass plate - Google Patents

Description

Glass plate manufacturing device

The utility model relates to a device for manufacturing a glass plate.

Glass plates used in flat panel displays (FPDs) such as liquid crystal displays and plasma displays are chamfered. In the cut surface of the glass sheet cut into a specific size, it is easy to form minute irregularities and cracks which may cause cracks and defects of the glass sheet. Therefore, by chamfering the corner portion of the cut surface of the glass sheet, generation of minute irregularities and cracks is suppressed.

Previously, grinding wheels were used in the chamfering of glass sheets. The grinding wheel is a disc-shaped grindstone. The glass plate is chamfered by rotating the grinding wheel and pressing the groove formed on the side surface of the grinding wheel against the cut surface of the glass plate, thereby grinding the corner portion of the cut surface of the glass plate.

[Previous Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open Publication No. 2002-160147

In recent years, the development of glass sheets has become more and more demanding, and the processing precision of glass sheets has become strict. In particular, when the large glass plate is adsorbed and fixed to the metal platen and chamfered, the flatness of the metal platen, and the transition axis of the grinding wheel and the end face of the glass plate as the cut surface of the glass plate are The parallelism requires high precision.

Further, there is a problem in that damage occurs on the surface of the glass sheet due to the minute glass piece generated when the glass sheet is chamfered. Damage formed on the surface of the glass plate for FPD Will have a greater impact on the quality of FPD. In order to suppress the formation of damage on the surface of the glass sheet, a method of attaching a protective sheet to a metal platen is known. However, in the case of using a metal platen covered with a protective sheet, it is difficult to uniformly generate adsorption pressure on the entire surface of the large glass plate. Therefore, there is a possibility that one of the glass sheets is partially caught in the protective sheet, and the glass sheet is partially deformed, so that the positional relationship between the end faces of the glass sheets and the grinding wheel becomes uncertain or unstable. Further, the glass sheet does not have a completely uniform flatness and has local warpage. Therefore, there is a case where the positional relationship between the end face of the glass plate and the vertical direction of the grinding wheel becomes uncertain or unstable due to the inherent warpage of the glass plate. In particular, the larger the size of the glass plate, the smaller the thickness of the glass plate, the larger the amount of warpage of the end face of the glass plate becomes, and the positional relationship between the end face of the glass plate and the grinding wheel becomes more uncertain. Further, the smaller the thickness of the glass sheet, the lower the rigidity of the glass sheet, and the more difficult the processing of the end surface of the glass sheet is.

For example, in the method for processing an end surface of a glass sheet disclosed in Japanese Laid-Open Patent Publication No. 2002-160147, a grinding wheel in which a concave portion is formed on a side peripheral surface is used. In this method, the end surface of the glass plate is ground into a curved shape by pressing the surface of the concave portion of the grinding wheel against the end surface of the glass plate, thereby chamfering the corner portion of the end surface. In this method, it is difficult to appropriately adjust the positional relationship between the concave portion of the grinding wheel and the end surface of the glass plate in the vertical direction, and the surface on the side of the glass plate and the surface on the lower side of the glass plate cannot be uniformly ground. Thus, when the amount of grinding on the surface of the glass plate is different from the amount of grinding on the lower surface of the glass plate, the cross-sectional shape of the end face of the glass plate becomes asymmetrical, and the strength of the glass plate is lowered, or the glass powder is self-contained. After the processing, the end face of the glass plate is increased in dust.

An object of the present invention is to provide a manufacturing apparatus for a glass sheet which can accurately process an end surface of a glass sheet.

The manufacturing apparatus of the glass plate of the present invention includes a grinding portion, a floating plate, and a control portion. The grinding section is disposed opposite to the end surface of the glass plate and has a processing area. The processing region is grounded while being in contact with the end surface while moving relative to the glass sheet along the longitudinal direction of the end surface. The floating plate supports the end of the glass plate non-contactly. The end portion includes an end face that is ground by a grinding portion. The floating plate can be adjusted in a first direction orthogonal to the main surface of the glass sheet. The floating plate has a plate surface opposite to the main surface of the end portion, a plurality of fluid ejection holes formed on the surface of the plate, and a plurality of fluid suction holes formed on the surface of the plate. The fluid ejection orifice ejects fluid toward the main surface opposite the end surface of the plate, and an upward force acts on the glass plate. The fluid suction hole draws fluid from the space between the surface of the plate and the main surface of the end, and causes a downward force to act on the glass plate. The control unit adjusts the position of the grinding portion relative to the floating plate, the upward force, and the downward force to guide the end surface to the processing region.

This glass plate manufacturing apparatus processes the end surface of the glass plate which is formed by a down-draw method, etc., and is cut into the size of a product. It is easy to form minute irregularities and cracks which may cause cracks and defects of the glass sheet on the cut surface which is the cut surface of the cut glass sheet. The glass plate is chamfered by grinding the end faces of the glass plates to suppress the occurrence of minute irregularities and cracks. In the glass plate manufacturing apparatus, for example, a grinding unit is grounded along the end surface of the glass sheet while the grinding unit such as the grinding wheel is pressed against the end surface of the glass sheet, and the end surface of the glass sheet is ground. The grinding wheel has a disk shape and a member having a concave portion formed on a side surface of the disk shape. The grinding wheel can also have a plurality of recesses.

In the apparatus for manufacturing a glass sheet, when the end surface of the glass sheet is ground, the end portion of the glass sheet is supported by the floating plate in a non-contact manner. The floating plate ejects fluid and draws fluid. When the end of the glass sheet is positioned above the floating plate, the fluid imparts a vertical upward force to the end of the glass sheet, and the fluid imparts a downward downward force to the end of the glass sheet. Thereby, since the end of the glass plate is supported non-contactly above the floating plate, the position of the end face of the end portion of the glass plate is stabilized in the vertical direction.

Further, by adjusting the position of the floating plate in the vertical direction in advance, the end surface of the end portion of the glass plate supported by the floating plate in a non-contact manner and the position in the vertical direction of the grinding wheel can be adjusted. system. When the grinding section grinds the end surface of the glass sheet, it also grinds one part of the main surface of the glass sheet adjacent to the end surface of the glass sheet. In the apparatus for manufacturing a glass sheet, the vertical direction of the floating plate is adjusted such that the difference between the amount of grinding of the main surface on the side of the glass sheet and the amount of grinding of the main surface on the lower side of the glass sheet is as small as possible. position. Thereby, since the end portion of the glass plate is guided by the floating plate to a height position where the difference in the amount of grinding between the two main surfaces of the glass plate is small, for example, the cross-sectional shape in the vertical direction can be symmetrical, and the precision is excellent. Grinding the end face of the glass plate can suppress the decrease in the strength of the glass plate caused by the end face processing. Therefore, the apparatus for manufacturing a glass sheet can suppress the positional relationship between the grinding portion and the end surface of the glass sheet before chamfering the end surface of the glass sheet, thereby suppressing the decrease in strength (for example, bending strength) of the glass sheet, and precision. The end face of the glass plate is processed well.

Further, in the apparatus for producing a glass sheet, it is preferable that the floating plate is formed of a porous body. In this case, it is preferable that the fluid ejection hole is a pore of the porous body, and the fluid suction hole is formed at a plurality of positions in the longitudinal direction and the second direction. The second direction is a direction orthogonal to the longitudinal direction and the first direction.

Further, in the apparatus for manufacturing a glass sheet, it is preferable that the fluid discharge hole and the fluid suction hole are formed at a plurality of positions in the longitudinal direction and the second direction. The second direction is a direction orthogonal to the longitudinal direction and the first direction.

Moreover, in the apparatus for manufacturing a glass sheet, it is preferable that the floating plate supports the end portion so that the difference in the surface width between the first grinding width and the second grinding width is small. The first grinding width is included in the second surface of the region on the side of the glass plate and in the second direction of the region removed by the grinding of the end surface. The second grinding width is included in the main surface of the lower side of the glass sheet, and is the dimension in the second direction of the region removed by the grinding of the end surface by the grinding portion. The end surface of the glass sheet can be uniformly processed by adjusting the position of the end portion of the glass sheet such that the difference in surface width becomes as small as possible.

Further, in the apparatus for manufacturing a glass sheet, it is preferable that the grinding portion is formed with a plus The grinding wheel of the machining groove in the work area, and the floating plate guides the end surface to the processing region such that the center of the first direction of the glass plate coincides with the center of the first direction of the machining groove in the processing region.

Moreover, in the apparatus for manufacturing a glass plate, it is preferable that the glass plate has a thickness of 0.25 mm or less.

The glass plate manufacturing apparatus of the present invention can process the end surface of the glass plate with high precision.

1‧‧‧glass plate end face processing device

3‧‧‧ glass plate

3a‧‧‧End face of glass plate

3b‧‧‧The upper surface of the glass plate (the main surface of the glass plate)

3c‧‧‧The lower surface of the glass plate (the main surface of the glass plate)

3d‧‧‧Upper corner

3e‧‧‧ lower corner

3f‧‧‧End of glass plate

10‧‧‧Metal pressure plate (fixed part)

20‧‧‧ Grinding Mechanism (Developing Department)

21‧‧‧Resin wheel (grinding department)

21a‧‧‧Upper surface

21b‧‧‧ lower surface

21c‧‧‧ side circumference

21d‧‧‧ recess (machining groove)

21e‧‧‧Rotary axis

21f‧‧‧The middle face of the grinding wheel

21g‧‧‧ upper inner surface

21h‧‧‧Central inner surface

21i‧‧‧ lower inner surface

22‧‧‧Float board

22a‧‧‧ board surface

22b‧‧‧Fluid spout

22c‧‧‧ fluid suction hole

23‧‧‧ base

24‧‧‧Mobile agencies

25‧‧‧ grinding wheel position adjustment mechanism

120a‧‧‧ grinding mechanism

120b‧‧‧ grinding mechanism

121a‧‧‧ grinding wheel

121b‧‧‧ grinding wheel

122a‧‧‧Floating board

122b‧‧‧Float board

123a‧‧‧ inclined section

123b‧‧‧ inclined section

222‧‧‧ floating board

222a‧‧‧ board surface

322‧‧‧ floating board

322a‧‧‧ board surface

322b‧‧‧Fluid ejection hole

322c‧‧‧ fluid suction hole

D‧‧‧ face width difference

D1‧‧‧ interval

D2‧‧‧ interval

F1‧‧‧1st fluid (fluid)

F2‧‧‧Second fluid (fluid)

L‧‧‧ Non-contact end dimensions

W1‧‧‧1st grinding width

W2‧‧‧2nd grinding width

X‧‧‧axis

Y‧‧‧Axis

Z‧‧‧Axis

Fig. 1 is a schematic view showing a glass sheet end surface processing apparatus according to an embodiment.

Fig. 2 is an external view of a grinding mechanism for processing an end surface of a glass sheet in an embodiment.

Figure 3 is an external view of the grinding wheel.

Figure 4 is a cross-sectional view of the grinding wheel.

Fig. 5 is a view showing an end portion of a glass plate which is supported by a floating plate in a non-contact manner.

Figure 6 is an enlarged view of the vicinity of the floating plate shown in Figure 5.

Fig. 7 is a view of the floating plate viewed from the upper side toward the lower side in the vertical direction.

Fig. 8 is a view showing the appearance of a glass plate which is ground by a grinding wheel.

Fig. 9 is a plan view showing a glass plate which is ground by a grinding wheel.

Fig. 10 is a cross-sectional view showing a portion where the end portion of the glass sheet is ground.

Fig. 11 is a cross-sectional view showing a portion to be ground of a glass plate end portion as a comparative example.

Fig. 12 is a view showing a grinding mechanism in which only the upper corner portion of the glass sheet is chamfered in the modification A.

Fig. 13 is a view showing a grinding mechanism in which only the lower corner portion of the glass sheet is chamfered in the modification A.

Fig. 14 is a view showing a grinding mechanism of Modification B.

Fig. 15 is a view showing the floating plate viewed from the upper side toward the lower side in the vertical direction of the modification C.

(1) Composition of glass plate end face processing device

An embodiment of a manufacturing apparatus for a glass sheet of the present invention will be described with reference to the drawings. In the apparatus for manufacturing a glass sheet of the present embodiment, a glass sheet end surface processing apparatus for processing an end surface of a glass sheet is used. Fig. 1 is a schematic view of a glass sheet end surface processing apparatus 1. The glass plate end surface processing apparatus 1 grinds the end surface 3a of the glass plate 3 in the state which fixed the glass plate 3. The glass plate 3 processed by the glass plate end surface processing apparatus 1 is obtained by cutting a plate-shaped glass formed by molten glass by a floating method, a down-draw method, or the like into a specific size. The glass sheet end surface processing apparatus 1 is particularly suitable for processing the end surface 3a of the glass sheet 3 having a thickness of 0.25 mm or less. The glass sheet 3 processed by the glass sheet end surface processing apparatus 1 is subjected to end surface processing by polishing or the like, and is subjected to a cleaning step, an inspection step, and the like, and is shipped as a product.

As shown in FIG. 1, the glass sheet end surface processing apparatus 1 mainly includes a metal platen 10 and a grinding mechanism 20. The metal platen 10 adsorbs the surface of the glass plate 3 to fix the glass plate 3. The glass plate 3 is placed on the upper surface of the metal platen 10 by a belt conveyor or the like. A plurality of suction holes are formed in the upper surface of the metal platen 10, and the glass plate 3 is adsorbed and fixed to the upper surface of the metal platen 10 by the suction force of the suction holes. Further, a protective sheet is attached to the upper surface of the metal platen 10. When the glass sheet 3 is used for the FPD, the damage formed on the surface of the glass sheet 3 is a factor that lowers the quality of the glass sheet 3. The protective sheet prevents the surface of the glass plate 3 from coming into direct contact with the upper surface of the metal platen 10, thereby suppressing the formation of damage on the surface of the glass plate 3. Further, a portion of the glass plate 3 near the end surface 3a is not adsorbed and fixed to the upper surface of the metal platen 10. The metal platen 10 to which the glass plate 3 is fixed can be moved in the end surface direction by a glass guide (not shown). Therefore, the glass plate 3 fixed to the metal platen 10 can be moved in the end direction by the glass guide.

The grinding mechanism 20 is designed to face each of the pair of end faces 3a of the glass sheet 3 Set. The grinding mechanism 20 has a grinding wheel 21. The grinding mechanism 20 grinds the end surface 3a of the glass sheet 3 fixed by the metal platen 10. The grinding mechanism 20 is pressed against the grinding wheel 21 that is rotating toward the end surface 3a of the glass sheet 3. In this state, the grinding mechanism 20 grinds the end surface 3a by moving the glass sheet 3 along the end surface 3a. In Fig. 1, the direction in which the grinding wheel 21 rotates and the direction in which the glass sheet 3 moves are indicated by arrows. Next, the details of the configuration and operation of the grinding mechanism 20 will be described.

(2) Composition of the grinding mechanism

Fig. 2 is an external view of the grinding mechanism 20 for grinding one end surface 3a of the glass sheet 3. In Fig. 2, the moving direction of the glass sheet 3 which moves together with the metal platen 10 in a state of being fixed to the metal platen 10 is indicated by an arrow. The grinding mechanism 20 shown in Fig. 2 has the same configuration and operation as the grinding mechanism 20 that grinds the other end surface 3a of the glass sheet 3. In the following description, the "end direction" means the longitudinal direction of the end surface 3a of the glass sheet 3 and the direction in which the glass sheet 3 moves. The "width direction" means a direction which is along the direction of the surface of the glass sheet 3 and which is orthogonal to the end surface direction. The "vertical direction" means a direction orthogonal to the surface of the glass plate 3. In the drawing, the end face direction is represented by "y-axis", the width direction is represented by "x-axis", and the vertical direction is represented by "z-axis". A plane orthogonal to the vertical direction is referred to as a "horizontal plane". The surface of the glass plate 3 is parallel to the horizontal plane.

The grinding mechanism 20 mainly includes a grinding wheel 21, a floating plate 22, a base 23, a moving mechanism 24, a grinding wheel position adjusting mechanism 25, and a control unit (not shown).

(2-1) Grinding wheel

The grinding wheel 21 is a disc-shaped grindstone. FIG. 3 is an external view of the grinding wheel 21. The grinding wheel 21 has a disk-shaped upper surface 21a, a disk-shaped lower surface 21b, and a side peripheral surface 21c that connects the upper surface 21a and the lower surface 21b. As shown in FIG. 3, a recess 21d is formed in the side peripheral surface 21c of the grinding wheel 21. The recess 21d is a groove formed over the entire circumference of the side peripheral surface 21c. The grinding wheel 21 rotates around a rotation shaft 21e that connects the center of the upper surface 21a and the center of the lower surface 21b. As shown in FIG. 1, the direction of rotation of the grinding wheel 21 is in the direction of movement of the glass sheet 3. Otherwise, the direction causes the glass sheet 3 to move in the direction. Furthermore, the grinding wheel 21 may have a plurality of recesses 21d.

The grinding wheel 21 is formed of a metal bond grinding stone. The metal bond grindstone is a grindstone which is obtained by solidifying a powder of a powder or an alloy of a plurality of metals with an iron-based binder and sintering the abrasive grains on the surface of the sintered body. The abrasive grains are fine particles such as diamond, alumina, and tantalum carbide. A metal bond grindstone with a high retention of the shape of the grindstone. The metal bond grindstone is, for example, a diamond grinding wheel. When the grinding wheel 21 is a diamond grinding wheel, the particle size of the diamond abrasive grains is preferably #400~#1200. The grinding wheel 21 is rotationally driven by a drive motor (not shown).

4 is an enlarged cross-sectional view showing the vicinity of the concave portion 21d of the grinding wheel 21. Fig. 4 shows a part of a section obtained by cutting the grinding wheel 21 in a plane including the rotating shaft 21e. As shown in FIG. 4, the cross-sectional shape of the recessed portion 21d has a shape that is symmetrical with respect to the imaginary plane located between the upper surface 21a and the lower surface 21b, that is, the intermediate surface 21f. The surface of the recess 21d includes an upper inner surface 21g, a central inner surface 21h, and a lower inner surface 21i. The upper inner surface 21g is a surface adjacent to the side peripheral surface 21c located above the concave portion 21d. The lower inner surface 21i is a surface adjacent to the side peripheral surface 21c located below the concave portion 21d. The central inner surface 21h is a surface adjacent to the upper inner surface 21g and the lower inner surface 21i. The central inner surface 21h corresponds to the bottom surface of the groove of the recess 21d.

The concave portion 21d of the grinding wheel 21 is a processing region for processing the end surface 3a of the glass sheet 3. In Fig. 4, reference is made to a portion of the cross section of the glass sheet 3 before the grinding wheel 21 is ground. The glass plate 3 has an end surface 3a, a main surface upper surface 3b as an upper side, and a main surface lower surface 3c as a lower side. The end surface 3a of the glass plate 3 is connected to the surface of the upper surface 3b and the lower surface 3c. As described below, the corner portion between the upper surface 3b and the end surface 3a, that is, the upper corner portion 3d is chamfered by the upper surface 21g of the concave portion 21d of the grinding wheel 21, and the corner portion between the lower surface 3c and the end surface 3a, that is, the lower corner portion 3e The inner surface 21i below the recess 21d of the grinding wheel 21 is chamfered. Hereinafter, a portion including the upper corner portion 3d and the lower corner portion 3e and the vicinity of the end surface 3a is referred to as an end portion 3f of the glass sheet 3.

(2-2) floating board

The floating plates 22 are respectively disposed on both sides in the width direction of the metal platen 10. That is, the floating plate 22 is provided between the metal platen 10 and each of the grinding wheels 21. The floating plate 22 is a device for supporting the end portion 3f of the glass plate 3 in a non-contact manner and guiding the end portion 3f to the concave portion 21d of the grinding wheel 21. The position of the floating plate 22 in the vertical direction can be adjusted by a floating plate position adjusting mechanism (not shown). The position of the floating plate 22 in the vertical direction is adjusted in advance before the glass plate end face processing device 1 is used. Fig. 5 is a view showing the end portion 3f supported by the floating plate 22 in a non-contact manner. Fig. 5 corresponds to a view of the grinding mechanism 20 shown in Fig. 4 as viewed along the y-axis. As shown in FIG. 5, above the floating plate 22, the end portion 3f of the glass plate 3 is supported without being in contact with the floating plate 22. The dimension in the vertical direction of the gap between the end portion 3f and the floating plate 22 is, for example, 5 μm to 40 μm, preferably 10 μm to 30 μm, and more preferably 15 μm to 30 μm. Figure 6 is an enlarged view of the vicinity of the floating plate 22 shown in Figure 5.

The floating plate 22 has a plate surface 22a opposite to the lower surface 3c of the end portion 3f which is non-contactly supported, a plurality of fluid ejection holes 22b formed in the plate surface 22a, and a plurality of fluid suctions formed on the plate surface 22a. Hole 22c. The fluid ejection hole 22b ejects the first fluid F1 toward the lower surface 3c opposite to the plate surface 22a. The fluid suction hole 22c sucks the second fluid F2 from the space between the plate surface 22a and the lower surface 3c. Both the first fluid F1 and the second fluid F2 are pure water. Further, the first fluid F1 and the second fluid F2 may be other liquids or gases, respectively.

The fluid ejection hole 22b has a function of imparting a force upward in the vertical direction to the end portion 3f. The fluid suction hole 22c has a function of imparting a downward force to the end portion 3f in the vertical direction. The fluid ejection hole 22b and the fluid suction hole 22c apply a force in the vertical direction to the end portion 3f, and stabilize the position of the end surface 3a of the end portion 3f in the vertical direction and the shape of the end portion 3f. Further, the floating plate 22 can adjust the flow rate of the first fluid F1 ejected from the fluid ejection hole 22b and the second fluid F2 sucked from the fluid suction hole 22c, thereby adjusting the vertical direction of the end surface 3a of the end portion 3f. The location. The position of the end face 3a in the vertical direction can be adjusted to a maximum of 30 μm. The smaller the interval between the lower surface 3c of the end portion 3f and the plate surface 22a, the stronger the force supporting the end portion 3f.

Fig. 7 is a view of the floating plate 22 as viewed from above in the vertical direction. Figure 7 The floating plate 22 is formed of a porous body. The material of the porous body is a material having high durability against high temperature and high pressure liquids and gases such as ceramics, carbon, and aluminum. The fluid ejection hole 22b is a pore formed in the porous body of the plate surface 22a. The fluid suction hole 22c is formed in a hole of the plate surface 22a using a drill or the like, and is indicated by a white circle in FIG. The diameter of the fluid suction hole 22c is larger than the diameter of the pores of the porous body, and is 0.3 mm to 1.0 mm. The fluid ejection hole 22b is formed in the entirety of the plate surface 22a. The fluid suction holes 22c are formed at a plurality of positions in the width direction and the end surface direction. In other words, the fluid ejection hole 22b and the fluid suction hole 22c are disposed to have a width in both the width direction and the end surface direction.

In Fig. 7, a fluid suction hole 22c is formed at a lattice point position in the plate surface 22a. The interval d1 between the fluid suction holes 22c in the width direction and the interval d2 between the fluid suction holes 22c in the end direction are appropriately set depending on the thickness of the glass plate 3 or the like. For example, when the thickness of the glass plate 3 is 0.5 mm, the intervals d1 and d2 are set to 18 mm, and when the thickness of the glass plate 3 is 0.25 mm, the intervals d1 and d2 are set to 4 mm.

(2-3) Matrix

The base body 23 has a moving mechanism 24, a grinding wheel position adjusting mechanism 25, and a counterweight (not shown). The counterweight produces a mechanism that forces the grinding wheel 21 to move in a horizontal plane. The counterweight presses, for example, the surface of the concave portion 21d of the grinding wheel 21 against the end surface 3a of the glass plate 3, or the surface of the concave portion 21d of the grinding wheel 21 from the end surface 3a of the glass plate 3.

(2-4) Mobile agency

The moving mechanism 24 is fixed to the base 23 to move the base 23 in the end direction and the width direction. The moving mechanism 24 moves the grinding mechanism 20 in the end direction and the width direction to adjust the position in the horizontal plane of the grinding wheel 21. Further, in the present embodiment, the position of the moving mechanism 24 is fixed during the processing of the end surface 3a of the glass sheet 3.

(2-5) Grinding wheel position adjustment mechanism

The grinding wheel position adjusting mechanism 25 is fixed to the base 23 to move the grinding wheel 21 in the vertical direction. The grinding wheel position adjusting mechanism 25 adjusts the position of the grinding wheel 2 in the vertical direction.

(2-6) Control Department

The control unit mainly includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and a hard disk. The control unit is connected to a drive motor of the grinding mechanism 20, a weight, and the like. The control unit controls the components connected to the control unit based on the programs and data stored in the ROM, the RAM, or the hard disk. For example, the control unit controls the drive motor to adjust the rotational speed of the grinding wheel 21. The control unit controls the weight to adjust the position in the horizontal plane of the grinding wheel 21, thereby adjusting the force imparted to the end surface 3a of the glass plate 3 by the grinding wheel 21. The control unit controls the position of the floating plate 22 in the vertical direction, the flow rate of the first fluid F1 ejected from the fluid ejection hole 22b, and the flow rate of the second fluid F2 sucked by the fluid suction hole 22c.

(3) Action of the glass plate end face processing device

The step of chamfering the upper corner portion 3d and the lower corner portion 3e by grinding the end surface 3a of the glass sheet 3 with the glass sheet end surface processing apparatus 1 will be described. First, the glass plate 3 is suction-fixed by the metal platen 10. As shown in Fig. 5, the end portion 3f of the glass sheet 3 is not adsorbed and fixed by the metal platen 10. The other end portion of the glass sheet 3 not shown in Fig. 5 is also not adsorbed and fixed by the metal platen 10. The dimension in the width direction of the portion of the glass plate 3 in the width direction and not in contact with the upper surface of the metal platen 10, that is, the non-contact end portion size L is 15 mm to 40 mm. At this time, the position in the vertical direction of the plate surface 22a of the floating plate 22 is previously adjusted to be lower than the lower surface 3c of the glass plate 3. Further, the non-contact end portion size L is preferably determined based on the balance between the grinding resistance between the grinding wheel 21 and the glass sheet 3 and the rigidity of the glass sheet 3. For example, in the processing of the glass sheet 3 as a glass substrate for a display, the non-contact end portion size L may be determined according to the thickness of the glass sheet 3. The greater the thickness of the glass sheet 3, the higher the rigidity of the glass sheet 3. Specifically, when the thickness of the glass plate 3 is 0.5 mm, the non-contact end portion size L may be set to 30 mm to 40 mm, and when the thickness of the glass plate 3 is 0.4 mm, the non-contact end portion may be used. The size L is set to 25mm~35mm, and the thickness of the glass plate 3 is In the case of 0.3 mm, the non-contact end portion size L is set to 15 mm to 20 mm.

Next, the position of the grinding wheel 21 in the vertical direction is adjusted by the grinding wheel position adjusting mechanism 25, and the position of the floating plate 22 in the vertical direction is adjusted by the floating plate position adjusting mechanism. The position of the grinding wheel 21 and the floating plate 22 in the vertical direction is such that the center position of the glass plate 3 in the vertical direction (thickness direction) coincides with the center position of the concave portion 21d of the grinding wheel 21 in the vertical direction, thereby making the glass The amount of grinding of the upper surface 3b of the plate 3 is adjusted in such a manner that the amount of grinding of the lower surface 3c of the glass plate 3 becomes equal. For example, by adjusting the upward force and the downward force acting on the glass sheet 3 by the floating plate 22, the position in the vertical direction of the end surface 3a of the glass sheet 3 can be stably adjusted to a specific position. Further, the position adjustment mechanism 25 of the grinding wheel 21 can adjust the position of the machining point of the end surface 3a with respect to the vertical direction of the floating plate 22. After the adjustment, the positions of the grinding wheel 21 and the floating plate 22 in the vertical direction are fixed. Further, the position of the grinding wheel 21 and the floating plate 22 in the vertical direction can be adjusted by grinding the test glass plate 3 and measuring the amount of grinding of the upper surface 3b and the lower surface 3c.

Next, the metal platen 10 of the fixed glass plate 3 is moved by the glass guide to adjust the position of the end face of the glass plate 3. Thereby, the end surface 3a of the glass plate 3 fixed to the metal platen 10 relatively moves in the end direction with respect to the fixed grinding wheel 21. At this time, the end portion 3f of the glass plate 3 is supported by the floating plate 22 in a non-contact manner. When the grinding wheel 21 comes into contact with the end surface 3a, the end portion 3f of the glass sheet 3 is guided by the floating plate 22 to the concave portion 21d of the grinding wheel 21. In this manner, the position of the end surface 3a of the glass sheet 3 in the vertical direction is stably supported by the floating plate 22, and is held so as to guide the end surface 3a to the concave portion 21d of the grinding wheel 21 as the processing region. As described above, the position of the end surface 3a of the glass sheet 3 in the vertical direction is adjusted in advance so that the amount of grinding of the upper surface 3b of the glass sheet 3 is equal to the amount of grinding of the lower surface 3c of the glass sheet 3. Thus, by adjusting the position of the concave portion 21d of the grinding wheel 21 with respect to the floating plate 22 and the upward force or downward force acting on the glass plate 3 by the floating plate 22, the end surface 3a of the glass plate 3 is accurately It is guided to the concave portion 21d which is the processing region.

Next, the end of the grinding wheel 21 fixed to the position in the vertical direction by the floating plate 22 is used. Face 3a is ground. The end surface 3a of the glass plate 3 enters the concave portion 21d formed on the side peripheral surface 21c of the grinding wheel 21, and is in contact with the upper surface 21g, the central inner surface 21h, and the lower inner surface 21i which are the surfaces of the concave portion 21d. At this time, since the force of the grinding wheel 21 against the end surface 3a of the glass plate 3 is generated, the end surface 3a of the glass plate 3 receives a force from the surfaces 21g, 21h, 21i of the concave portion 21d of the grinding wheel 21. As a result, the end surface 3a of the glass plate 3 is ground by the concave portion 21d of the grinding wheel 21. FIG. 8 is an external view showing the glass plate 3 which is ground by the grinding wheel 21. FIG. 9 is a plan view showing the glass plate 3 which is ground by the grinding wheel 21. In Figs. 8 and 9, the direction in which the grinding wheel 21 rotates and the direction in which the glass sheet 3 moves are indicated by arrows.

In the case where the resin wheel 21 using a resin bonding material is used instead of the grinding wheel 21, the concave portion 21d may be formed not on the side peripheral surface 21c of the resin wheel 21 at the time of initial use. In this case, the concave portion 21d can also be formed by processing the end surface of the glass sheet 3 by the resin wheel 21. Specifically, the resin wheel 21 having no recess 21d is pressed against the end surface 3a of the glass plate 3 by excessive force, and the side peripheral surface 21c of the resin wheel 21 is intentionally worn, so that the side peripheral surface 21c is worn. A recess 21d is formed. At this time, the glass plate 3 previously processed by the end surface 3a can be used according to the desired shape of the recessed part 21d.

Fig. 10 is a cross-sectional view showing the end portion 3f of the glass sheet 3 at the portion where the end portion 3f of the glass sheet 3 is ground. In Fig. 10, a region in which a hatching is drawn by a broken line is a portion which is removed by grinding by the grinding wheel 21. The upper corner portion 3d of the glass plate 3 is in contact with the upper inner surface 21g of the concave portion 21d of the grinding wheel 21, and the lower corner portion 3e of the glass plate 3 is in contact with the lower inner surface 21i of the concave portion 21d of the grinding wheel 21. Thereby, the upper corner portion 3d and the lower corner portion 3e of the glass sheet 3 are chamfered by the force from the grinding wheel 21.

As shown in Fig. 10, a part of the upper surface 3b and the lower surface 3c of the glass sheet 3 is ground by the grinding wheel 21. Hereinafter, the dimension in the width direction of the portion where the upper surface 3b is ground at the height position is referred to as the first grinding width W1, and the dimension in the width direction of the portion where the lower surface 3c is ground at the height position is referred to as the second dimension. Grinding width W2. In other words, the first grinding width W1 is included in the upper surface 3b of the glass sheet 3, and is ground by the grinding wheel 21 on the end surface 3a. The dimension in the width direction of the removed region, and the second grinding width W2 are included in the width direction of the region of the lower surface 3c of the glass sheet 3 and which is removed by grinding of the end surface 3a by the grinding wheel 21. Moreover, the difference between the first grinding width W1 and the second grinding width W2 is referred to as a surface width difference D.

The floating plate 22 has an effect of adjusting the position of the end surface 3a of the glass sheet 3 in the vertical direction so that the surface width difference D is as small as possible, and guiding the end portion 3f of the glass sheet 3 to the grinding wheel 21. Concave portion 21d. Specifically, the floating plate 22 preferably guides the end portion 3f of the glass sheet 3 to the concave portion 21d of the grinding wheel 21 so that the surface width difference D is 50 μm or less, preferably 20 μm or less. Therefore, before the end surface 3a of the glass sheet 3 is ground by the grinding wheel 21, the position in the vertical direction of the intermediate surface 21f of the grinding wheel 21 and the end surface 3a of the glass sheet 3 which are supported by the floating plate 22 in a non-contact manner are The position of the grinding wheel 21 and the floating plate 22 in the vertical direction is adjusted in such a manner that the height positions in the center in the vertical direction are the same. Thereby, the glass plate end surface processing apparatus 1 can process the end surface 3a of the glass plate 3 accurately.

Further, the surface difference D of the end portion 3f of the glass plate 3 after the processing is more preferably 10 μm or less, and further preferably 5 μm or less. Further, the difference in surface width D of the end portion 3f of the processed glass sheet 3 can be determined according to the thickness of the glass sheet 3. For example, the surface width difference D is preferably 10% or less, more preferably 5% or less, still more preferably 3% or less, of the thickness of the glass plate 3.

(4) Features

In the glass sheet end surface processing apparatus 1 of the present embodiment, the end surface 3a of the glass sheet 3 which is formed of molten glass by a floating method or a down-draw method and cut into a product size is ground. On the end surface 3a which is the cut surface of the glass plate 3, it is easy to form minute irregularities and cracks which may cause cracks and defects of the glass sheet 3. The end surface 3a of the glass plate 3 is ground, and the glass plate 3 is chamfered, thereby suppressing generation of minute irregularities and cracks. In the glass plate end surface processing apparatus 1, the glass plate 3 is moved along the end surface 3a in a state where the grinding wheel 21 is pressed against the end surface 3a of the glass plate 3, and the end surface 3a is ground.

The glass plate end surface processing apparatus 1 is adjusted before the end surface 3a of the glass plate 3 is ground. The positional relationship between the grinding wheel 21 and the end surface 3a in the vertical direction. Specifically, the glass sheet end surface processing apparatus 1 is such that the position in the vertical direction of the intermediate surface 21f of the grinding wheel 21 is the height position of the center of the glass plate 3 supported by the floating plate 22 in the vertical direction. The position of the grinding wheel 21 and the floating plate 22 in the vertical direction is adjusted in advance. Thereby, the position of the intermediate surface 21f of the grinding wheel 21 in the vertical direction is a position of an imaginary plane located between the upper surface 3b and the lower surface 3c of the glass plate 3 supported by the floating plate 22, and the glass is set. The position of the end face 3a of the plate 3 in the vertical direction. As a result, the position of the end surface 3a of the glass plate 3 in the vertical direction is automatically set so that the difference between the first grinding width W1 and the second grinding width W2, that is, the surface width difference D is as small as possible. Thereby, as shown in FIG. 10, the cross-sectional shape of the glass plate 3 ground by the grinding wheel 21 is substantially symmetrical with respect to the imaginary plane located between the upper surface 3b of the glass plate 3 and the lower surface 3c.

Here, as a comparative example, the cross-sectional shape of the glass plate 3 which was ground in the case where the surface width difference D is relatively large is shown in FIG. As shown in Fig. 11, in the case where the surface width difference D is large, the cross-sectional shape of the glass sheet 3 ground by the grinding wheel 21 is substantially asymmetrical with respect to the intermediate surface of the upper surface 3b and the lower surface 3c of the glass sheet 3. . In this case, when the end surface 3a of the ground glass plate 3 is further polished, there is a possibility that one of the end faces 3a is not polished, and the end face 3a is not integrally polished. It is easy to produce fine particles of glass from the unground portion of the end face 3a. Therefore, if the end face 3a is not integrally ground, there is a problem that the quality of the glass sheet 3 as a product is lowered. Further, when the cross-sectional shape of the glass sheet 3 is substantially asymmetrical with respect to the intermediate surface, the processing amount of the upper surface 3b of the glass sheet 3 becomes larger than the design value, and as a result, the bending strength according to the design cannot be obtained, and the product is not provided as a product. The strength of the glass plate 3 is reduced.

Therefore, the glass plate end surface processing apparatus 1 adjusts the grinding wheel 21 by the grinding wheel position adjusting mechanism 25, the floating plate position adjusting mechanism (not shown), and the floating plate 22 before grinding the end surface 3a of the glass plate 3 by the grinding wheel 21. a positional relationship with the end surface 3a in the vertical direction, whereby the cross-sectional shape of the glass sheet 3 can be substantially symmetrical with respect to the intermediate surface Processing is performed with precision. Thereby, the quality of the glass sheet 3 as a product can be improved.

Further, the glass sheet end surface processing apparatus 1 can use the floating plate 22 so that the other members do not contact the upper surface 3b and the lower surface 3c of the end portion 3f of the glass sheet 3 to adjust the vertical direction of the end portion 3f of the glass sheet 3. position. Therefore, the glass sheet end surface processing apparatus 1 can hold the state of the upper surface 3b and the lower surface 3c of the end part 3f of the glass plate 3 processed by the grinding mechanism 20 favorably.

Further, the end portion 3f of the glass sheet 3 is supported by the first fluid F1 ejected from the fluid ejection hole 22b and the second fluid F2 sucked by the fluid suction hole 22c. The fluid ejection hole 22b and the fluid suction hole 22c are formed at a plurality of positions in the width direction and the end surface direction on the plate surface 22a of the floating plate 22. Therefore, the plurality of support points of the end portion 3f of the glass sheet 3 in the width direction are supported, and the warpage or application of the glass sheet 3 at the support point is supported as compared with the case where one support point in the width direction is supported. The stress to the glass sheet 3 is small. In other words, by supporting the end portion 3f of the glass sheet 3 in a non-contact manner by the floating plate 22, the unevenness formed on the upper surface 3b and the lower surface 3c of the end portion 3f is suppressed. As a result, an error in the position in the vertical direction of the end surface 3a of the end portion 3f due to the shape of the end portion 3f is suppressed.

Therefore, the glass plate end surface processing apparatus 1 can reduce the positional difference D in the vertical direction of the end surface 3a of the glass plate 3 by the floating plate 22, and can reduce the said surface width difference D. In particular, in the case of processing the end surface of the thin glass plate 3 having a thickness of 0.25 mm or less, since the glass plate 3 is easily bent, it is important to suppress warpage of the end portion 3f which is not fixed to the metal platen 10. Therefore, the glass sheet end surface processing apparatus 1 is particularly suitable for the end surface processing of the thin glass sheet 3.

(5) Variations

(5-1) Change A

In the glass plate end surface processing apparatus 1 of the embodiment, the glass plate 3 is moved in the end surface direction while the glass plate 3 is fixed to the metal platen 10, and the end surface 3a of the glass plate 3 is ground. Before the grinding wheel 21 comes into contact with the end surface 3a, the end portion 3f of the glass sheet 3 is guided by the floating plate 22 to the concave portion 21d of the grinding wheel 21. End face 3a of glass plate 3 and surface as recess 21d The upper inner surface 21g, the central inner surface 21h, and the lower inner surface 21i are in contact. Thereby, the upper corner portion 3d and the lower corner portion 3e of the glass sheet 3 are simultaneously chamfered.

However, the upper corner portion 3d and the lower corner portion 3e of the glass sheet 3 may not be chamfered at the same time. For example, it is also possible to first chamfer only the upper corner portion 3d of the glass sheet 3, and secondly only chamfer the lower corner portion 3e of the glass sheet 3. Fig. 12 shows a grinding mechanism 120a for chamfering only the upper corner portion 3d of the glass sheet 3. Fig. 13 shows a grinding mechanism 120b which only chamfers the lower corner portion 3e of the glass sheet 3. 12 and 13 are views as viewed in the y-axis direction. The grinding mechanism 120a has a grinding wheel 121a and a floating plate 122a, and the grinding mechanism 120b has a grinding wheel 121b and a floating plate 122b.

In Fig. 12, above the floating plate 122a, the glass plate 3 is not supported in contact with the floating plate 122a. Since the end surface 3a of the glass plate 3 is supported by the floating plate 122a, the positional accuracy of the end surface 3a of the glass plate 3 in the vertical direction is high. The grinding wheel 121a is disposed above the glass plate 3, and only the upper corner portion 3d of the glass plate 3 is ground. The grinding wheel 121a has an inclined portion 123a that is in contact with the upper corner portion 3d. The amount of grinding in the thickness direction of the glass plate 3 is preferably 10% to 20% of the thickness of the glass plate 3. When the end surface 3a of the glass plate 3 has the end surface 3a cut by mechanical scribing by the cutter wheel, it is also possible to remove the scribe by grinding 10% to 20% of the thickness of the glass plate 3. The crack of the line.

In Fig. 13, above the floating plate 122b, the glass plate 3 is supported without being in contact with the floating plate 122b. Since the end surface 3a of the glass plate 3 is supported by the floating plate 122b, the positional accuracy of the end surface 3a of the glass plate 3 in the vertical direction is high. The grinding wheel 121b is disposed below the glass plate 3, and only the lower corner portion 3e of the glass plate 3 is ground. The grinding wheel 121b has an inclined portion 123b that is in contact with the lower corner portion 3e.

(5-2) Change B

In the glass sheet end surface processing apparatus 1 of the embodiment, the glass sheet 3 is supported without being in contact with the floating plate 22 above the floating plate 22. However, it is also possible to support the glass sheet 3 not in contact with the floating plate 22 below the floating plate 22. Fig. 14 shows a grinding mechanism 220 of the present modification. Fig. 14 is a view as seen in the y-axis direction. In FIG. 14, a floating plate disposed below the glass plate 3 is shown. 222. The lower surface of the floating plate 222, that is, the plate surface 222a faces the upper surface 3b of the end portion 3f of the glass plate 3.

(5-3) Change C

The glass sheet end surface processing apparatus 1 of the embodiment has a floating plate 22 formed of a porous body, and an upward force acts on the fluid discharge hole 22b of the glass plate 3 as a pore of the porous body. However, the fluid ejection hole 22b may be a hole formed in the plate surface 22a using a drill or the like, similarly to the fluid suction hole 22c.

Fig. 15 is a view showing the floating plate 322 of the present modification viewed from the upper side toward the lower side in the vertical direction. A plurality of fluid ejection holes 322b and a plurality of fluid suction holes 322c are formed on the plate surface 322a of the floating plate 322. In Fig. 15, the fluid ejection holes 322b are indicated by black circles, and the fluid suction holes 322c are indicated by white circles. In Fig. 15, the fluid ejection hole 322b and the fluid suction hole 322c are formed at the lattice point position on the plate surface 322a. The diameter of the fluid ejection hole 322b is larger than the diameter of the pore of the porous body. The fluid ejection holes 322b are formed at a plurality of positions in the width direction and the end surface direction. In other words, the fluid ejection hole 322b is disposed to have a width in both the width direction and the end surface direction. The fluid suction hole 322c is the same as the fluid suction hole 22c of the embodiment. The fluid ejection hole 322b and the fluid suction hole 322c are alternately arranged in the width direction.

(5-4) Variation D

In the glass plate end surface processing apparatus 1 of the embodiment, the glass plate 3 is moved in the end surface direction while the glass plate 3 is fixed to the metal platen 10, and the end surface 3a of the glass plate 3 is ground. However, when the end surface 3a of the glass plate 3 is ground, the glass plate 3 may not be fixed. For example, instead of the metal platen 10, a device for blowing air to the lower surface 3c of the glass plate 3 to float the glass plate 3 may be used, except that the entire glass plate 3 is in contact with the guiding member of the glass plate 3, The glass plate 3 is conveyed in the end direction without being in contact with any object.

(5-5) Change E

The glass sheet end surface processing apparatus 1 of the embodiment is attached to the grinding mechanism having the grinding wheel 21. When the 20 is fixed, the metal platen 10 to which the glass plate 3 is fixed is moved in the end direction by the glass guide, and the end surface 3a of the glass plate 3 is ground. However, the end surface 3a of the glass plate 3 may be ground by relatively moving the grinding wheel 21 and the end surface 3a in the end surface direction by using another method. For example, the metal platen 10 to which the glass plate 3 is fixed may be fixed, and the position of the end surface of the grinding mechanism 20 having the grinding wheel 21 may be changed by the moving mechanism 24. In this case, the grinding wheel 21 that is rotating can also move relative to the end surface 3a in the end surface direction while being in contact with the end surface 3a of the glass sheet 3. Therefore, the grinding wheel 21 can grind the end surface 3a of the glass plate 3. Further, both the metal platen 10 and the grinding mechanism 20 can be moved relative to each other in the end surface direction to grind the end surface 3a of the glass plate 3.

(5-6) Variation F

The glass sheet end surface processing apparatus 1 of the embodiment has a grinding wheel 21 that is right-formed by a metal bond. However, the grinding wheel 21 can also be formed from an elastic grindstone. The elastic grindstone is a grindstone formed by combining abrasive grains of hard particles with a flexible and elastic bonding material. The abrasive grains are fine particles such as diamond, alumina, and tantalum carbide. The bonding material is a soft resin such as polyvinyl alcohol or polyurethane. The elastic grindstone has a configuration in which a plurality of abrasive grains are held inside the sponge structure including the bonding material.

(5-7) Change G

The glass sheet end surface processing apparatus 1 of the embodiment may further include a polishing mechanism that polishes the end surface 3a of the glass sheet 3 that has been ground by the grinding wheel 21. The grinding mechanism grinds the end surface 3a using a grinding wheel formed of an elastic grindstone. The abrasive grains of the grinding wheel are preferably cerium carbide, and the particle size of the cerium carbide abrasive grains is preferably #400~#1200. The binder to which the abrasive grains of the grinding wheel are bonded is preferably a flexible and elastic polyurethane-based resin binder. The polishing mechanism can also adjust the positional relationship between the grinding wheel and the end surface 3a in the vertical direction before the end surface 3a is polished.

The glass plate end face processing apparatus 1 is formed by the end face 3a of the glass plate 3 by using the grinding wheel 21. Before the row grinding, the positional relationship between the grinding wheel 21 and the end surface 3a in the vertical direction is adjusted, and the end surface 3a of the glass sheet 3 can be uniformly ground. Thereby, the grinding mechanism can uniformly grind the ground end face 3a. As a result, the end surface 3a of the glass sheet 3 processed by the glass sheet end surface processing apparatus 1 has almost no unpolished portion, so that it is difficult to produce fine particles of glass from the processed glass sheet 3. Therefore, the glass sheet end surface processing apparatus 1 can improve the quality of the glass sheet 3 as a product.

Further, it has been confirmed that the end surface 3a of the glass sheet 3 subjected to the grinding and polishing by the glass sheet end surface processing apparatus 1 has Ra (surface roughness) of less than 0.1 μm as a whole. Moreover, when it is confirmed that the positional relationship between the grinding wheel and the end surface 3a in the vertical direction is adjusted before the end surface 3a is polished, the end face of the glass plate 3 subjected to the grinding and grinding by the glass plate end surface processing apparatus 1 is confirmed. 3a has Ra of less than 0.08 μm in its entirety.

1‧‧‧glass plate end face processing device

3‧‧‧ glass plate

3a‧‧‧End face of glass plate

10‧‧‧Metal pressure plate (fixed part)

21‧‧‧Resin wheel (grinding department)

22‧‧‧Float board

22a‧‧‧ board surface

23‧‧‧ base

24‧‧‧Mobile agencies

25‧‧‧ grinding wheel position adjustment mechanism

X‧‧‧axis

Y‧‧‧Axis

Z‧‧‧Axis

Claims (10)

A manufacturing apparatus for a glass sheet, comprising: a grinding portion disposed to face an end surface of the glass sheet and having a processing region, wherein the processing region is in contact with the end surface by one surface, and along the end surface The end surface is ground in a longitudinal direction with respect to the glass plate; the floating plate supports the end portion of the glass plate in a non-contact manner, and is positionally adjustable in a first direction orthogonal to a main surface of the glass plate. The end portion includes the end surface that is ground by the grinding portion, and the control portion. The floating plate has a plate surface that faces the main surface of the end portion, and a plurality of fluid ejection holes formed in the plurality of fluid ejection holes. The surface of the plate is ejected with fluid toward the main surface of the end portion opposite to the surface of the plate, so that an upward force acts on the glass plate; and a plurality of fluid suction holes are formed on the surface of the plate. a space between the surface of the plate and the main surface of the end portion sucks the fluid to cause a downward force to act on the glass plate; and the above control The portion adjusts the position of the grinding portion relative to the floating plate, the upward force, and the downward force to guide the end surface to the processing region. The apparatus for manufacturing a glass sheet according to claim 1, wherein the floating plate is formed of a porous body, and the fluid ejection hole is a pore of the porous body, and The fluid suction hole is formed at a plurality of positions in the longitudinal direction and the second direction orthogonal to the longitudinal direction and the first direction. The apparatus for manufacturing a glass sheet according to claim 1, wherein the fluid ejection hole and the fluid suction hole are formed in the longitudinal direction and at a plurality of positions in a second direction orthogonal to the longitudinal direction and the first direction. . The apparatus for manufacturing a glass sheet according to any one of claims 1 to 3, wherein the floating plate has a first grinding width and a second grinding width such that a difference between the first grinding width and the second grinding width is a surface width The first grinding width is included in the main surface of the glass plate side and is the second portion of the region removed by the grinding portion by the grinding portion. The second grinding width is included in the main surface on the lower side of the glass sheet, and is a dimension in the second direction of a region removed by grinding of the end surface by the grinding portion. The apparatus for manufacturing a glass sheet according to any one of claims 1 to 3, wherein the grinding unit is formed with a grinding wheel having a processing groove of the processing region, and the floating plate is configured to cause the first direction of the glass sheet The center is guided to the processing region so as to match the center of the first direction of the processing groove in the processing region. The apparatus for manufacturing a glass sheet according to claim 4, wherein the grinding unit is formed with a grinding wheel having a processing groove of the processing region, and the floating plate has a center of the first direction of the glass sheet and the processing groove The end surface of the first direction is guided to the processing region so that the center of the first direction coincides with the processing region. The apparatus for manufacturing a glass sheet according to any one of claims 1 to 3, wherein the glass sheet has a thickness of 0.25 mm or less. The apparatus for manufacturing a glass sheet according to claim 4, wherein the glass sheet has a thickness of 0.25 mm or less. The apparatus for manufacturing a glass sheet according to claim 5, wherein the glass sheet has a thickness of 0.25 mm or less. The apparatus for manufacturing a glass sheet according to claim 6, wherein the glass sheet has a thickness of 0.25 mm or less.