TWI896735B - Glass plate manufacturing method and manufacturing device - Google Patents

Abstract

The glass sheet manufacturing method includes: a first processing step of processing the end surface ES of the glass sheet G using a first processing device 2A; and a second processing step of processing the end surface ES of the glass sheet G using a second processing device 2B after the first processing step. A position adjustment mechanism 8B of the second processing device 2B adjusts the cutting position of the second processing tool 5B of the second processing device 2B in the second processing step in a manner that mimics the position of the first processing tool 5A of the first processing device 2A in the first processing step.

Description

Glass plate manufacturing method and manufacturing device

The present invention relates to a method and apparatus for manufacturing a glass sheet.

Glass sheets are used as substrates or cover glasses in displays such as liquid crystal displays (LCDs). To manufacture these glass sheets, one or more sheets are cut from a large original glass sheet (molded original sheet). This allows the production of glass sheets of the desired size.

On the other hand, the end surfaces of glass sheets cut from original glass sheets may have tiny scratches (defects). When scratches occur on the end surfaces of glass sheets, cracks may develop from these scratches. To prevent these problems, the end surfaces of glass sheets are subjected to grinding (rough processing) or polishing (fine processing), for example.

The device used for this type of processing, for example, is disclosed in Patent Document 1, which includes: a supporting member (arm member) that supports the processing tool; and a pressing mechanism (servo mechanism) that enables the supporting member to generate a force for the processing tool to press the end surface of the glass plate.

In the processing device, one end of a support member rotatably supports a processing tool. The other end of the support member is connected to a pressing mechanism. The middle section of the support member is supported by a support shaft member. The support member changes its posture by rotating about the support shaft member.

The pressing mechanism includes a connecting rod connected to the other end of the support member and a servo motor that drives the connecting rod. The pressing mechanism uses the servo motor to drive the connecting rod, thereby controlling the posture (rotation angle) of the support member so that the pressure applied by the processing tool to the end surface of the glass sheet remains constant. [Prior Art] [Patent]

Patent Document 1: Japanese Patent Publication No. 2017-30089

[The problem that the invention aims to solve]

In the processing apparatus, the pressing force generated by the processing tool is maintained constant by using the support member and the pressing mechanism, so that the end surface of the glass plate can be processed with a desired processing amount.

However, the pressing force applied to the processing tool by the pressing mechanism strictly varies depending on the position of the processing tool. For example, in the pressing mechanism described in Patent Document 1, even if the servo motor torque is constant, the pressing force applied to the processing tool will vary depending on the posture (rotation angle) of the supporting member. Therefore, if, for example, the dimensions of the glass sheet deviate during cutting or the glass sheet shifts position while being processed by the processing tool, it becomes difficult to precisely control the pressing force applied by the pressing mechanism to the processing tool. In such cases, the pressing force fluctuates, and the processing volume may be excessive or insufficient.

The present invention was developed in light of the aforementioned situation and addresses the technical challenge of processing the end faces of glass sheets to a desired processing volume. [Solution]

The present invention is used to solve the above-mentioned problem and is a method for manufacturing a glass plate, comprising the following steps: a first processing step of processing the end surface of the glass plate using a first processing device, and a second processing step of processing the end surface of the glass plate using a second processing device. The characteristics of the manufacturing method are as follows. The first processing device includes: a first processing tool for processing the end surface of the glass plate; and a first pressing mechanism for applying a pressing force to the first processing tool to press the end surface of the glass plate. The second processing device includes: a second processing tool for processing the end surface of the glass plate; a second pressing mechanism for applying a pressing force to the second processing tool to press the end surface of the glass plate; and a position adjustment mechanism for changing the cutting position of the second processing tool relative to the end surface of the glass plate by moving the second pressing mechanism. The position adjustment mechanism adjusts the cutting position of the second processing tool in the second processing step in a manner that mimics the position of the first processing tool in the first processing step.

According to the above configuration, by adjusting the penetration position of the second working tool (the position of the second pressing mechanism) using the position adjustment mechanism according to the penetration position of the first working tool in the first working step, the second pressing mechanism can be moved to an optimal position according to the shape or position of the end face of the glass sheet. This ensures that the pressing force applied by the second pressing mechanism to the second working tool remains constant, allowing the desired processing volume to be achieved on the end face of the glass sheet.

In this method, the second pressing mechanism may include: a supporting member that supports the second processing tool and changes its posture by rotating around a predetermined axis; a connecting rod mechanism connected to the supporting member; and a servo motor that drives the connecting rod mechanism.

In the second pressing mechanism comprising a support member and a connecting rod mechanism, the pressing force applied to the second processing tool can be easily varied according to the position (rotation angle) of the support member. By applying this second pressing mechanism, the present invention can achieve a more pronounced effect in processing the end face of a glass sheet with a desired processing volume.

In this method, the position adjustment mechanism can adjust the cutting position of the second processing tool in such a manner that the posture of the supporting member is constant.

According to the above configuration, by adjusting the cutting position of the second processing tool using the position adjustment mechanism, the posture of the support member can be kept substantially constant, thereby applying the optimal pressing force to the second processing tool for processing the end surface of the glass sheet. For example, if the original fluctuation in the posture (rotation angle) of the support member is approximately ±2°, the present invention can reduce this fluctuation to approximately ±0.7°.

In this method, the first processing tool and the second processing tool can be moved relative to the glass plate along a predetermined conveying direction during the first processing step and the second processing step, thereby enabling the entire end face of the glass plate to be processed with high precision.

The present invention is used to solve the above-mentioned problem, and is a glass plate manufacturing device comprising the following devices: a first processing device for processing the end surface of the glass plate, a second processing device for processing the end surface of the glass plate processed by the first processing device, and a control device. The manufacturing device is characterized as follows. The first processing device comprises: a first processing tool for processing the end surface of the glass plate; and a first pressing mechanism for applying a pressing force to the first processing tool to press the end surface of the glass plate. The second processing device comprises: a second processing tool for processing the end surface of the glass plate; a second pressing mechanism for applying a pressing force to the second processing tool to press the end surface of the glass plate; and a position adjustment mechanism for changing the cutting position of the second processing tool relative to the end surface of the glass plate by moving the second pressing mechanism. The control device operates the position adjustment mechanism to adjust the cutting position of the second processing tool in the second processing device in a manner that imitates the position of the first processing tool in the first processing device.

According to the above configuration, by adjusting the penetration position of the second working tool (the position of the second pressing mechanism) using the control device and position adjustment mechanism according to the penetration position of the first working tool in the first working device, the second pressing mechanism can be moved to an optimal position according to the shape or position of the end surface of the glass sheet. This allows the pressing force applied by the second pressing mechanism to the second working tool to be constant, allowing the desired processing volume to be achieved on the end surface of the glass sheet. [Effects of the Invention]

According to the present invention, the end surface of a glass plate can be processed with a desired processing amount.

1 to 5 show an embodiment of a method for manufacturing a glass plate according to the present invention.

Figures 1 to 3 illustrate a glass sheet manufacturing apparatus used in this method. Manufacturing apparatus 1 includes a first processing apparatus 2A, a second processing apparatus 2B, a moving apparatus 3 for moving the first and second processing apparatuses 2A and 2B, and a control device 4 for controlling the processing apparatuses 2A and 2B and the moving apparatus 3. As shown in Figure 1 , manufacturing apparatus 1 processes the end surface ES of a glass sheet G by moving the processing apparatuses 2A and 2B in a predetermined conveying direction X via the moving apparatus 3.

As shown in Figures 1 and 2, the first processing device 2A includes: a first processing tool 5A, a first driving device 6A that drives the first processing tool 5A, a first pressing mechanism 7A that applies a force to 5A to press the glass plate G, and a first position adjustment mechanism 8A that adjusts the position of the first processing tool 5A by moving the first pressing mechanism 7A.

The second processing device 2B includes: a second processing tool 5B, a second driving device 6B that drives the second processing tool 5B, a second pressing mechanism 7B that applies a force to the second processing tool 5B to press the glass plate G, and a second position adjustment mechanism 8B that adjusts the position of the second processing tool 5B by moving the second pressing mechanism 7B.

Each processing tool 5A, 5B includes, for example, a rotatable grinding wheel (grinding wheel or grinding wheel). The processing tool 5A/5B is connected to the drive device 6A/6B and is rotatably supported by a part of the pressing mechanism 7A/7B.

Drive device 6A/6B includes an electric motor that rotates processing tool 5A/5B. This electric motor can be a synchronous motor, an induction motor, a servo motor, or the like. Drive device 6A/6B is supported by a portion of pressing mechanism 7A/7B.

As shown in FIG. 1 and FIG. 2 , the pressing mechanism 7A/7B includes an arm member 9 as a supporting member that rotatably supports the processing tool 5A/5B, a driving portion 10 that drives the arm member 9, and a base 11 that supports the arm member 9 and the driving portion 10.

The arm member 9 is, for example, a long plate member, but the shape is not limited thereto. One end of the arm member 9 supports the processing tool 5A or 5B and the drive device 6A or 6B. The other end of the arm member 9 is connected to the drive unit 10.

The middle section of the arm member 9 is supported by a support shaft member 12. The arm member 9 is configured to rotate (or swing) about the support shaft member 12. This rotational movement of the arm member 9 allows adjustment of the position (hereinafter referred to as the "cutting position") of the processing tools 5A and 5B in a direction Y perpendicular to the conveying direction X (hereinafter referred to as the "cutting direction") orthogonal to the conveying direction X. In other words, the rotational movement of the arm member 9 allows adjustment of the force (pressing pressure) with which the processing tools 5A and 5B press against the glass sheet G.

The driving unit 10 includes a connecting rod mechanism 13 connected to the arm member 9 and an electric motor 14 that drives the connecting rod mechanism 13.

Each link mechanism 13 includes a first link member 15 and a second link member 16. One end of the first link member 15 is fixed to the shaft (rotating shaft) 14a of the electric motor 14, and the other end is rotatably connected to the second link member 16 via a first joint 17. One end of the second link member 16 is connected to the first link member 15, and the other end is rotatably connected to the end of the arm member 9 via a second joint 18.

The pressing mechanisms 7A and 7B cause the rotational force of the shaft 14a of the electric motor 14 to act as a torque on the arm member 9 via the link mechanism 13. The arm member 9 generates a pressing force on the glass sheet G by the processing tools 5A and 5B using the torque.

The electric motor 14 includes, for example, a servo motor. The electric motor 14 drives the link mechanism 13 to maintain a constant pressure from the processing tools 5A and 5B on the glass sheet G. Specifically, the electric motor 14 adjusts the driving force of the link mechanism 13 on the arm member 9 based on torque through feedback control.

The pressing mechanisms 7A and 7B are communicably connected to the control device 4. The pressing mechanisms 7A and 7B can transmit information related to the torque of the electric motor 14 or the rotation angle of the shaft 14a to the control device 4.

As shown in FIG. 2 , the base 11 includes a first supporting portion 11 a supporting the arm member 9 via a supporting shaft member 12 , and a second supporting portion 11 b supporting the first supporting portion 11 a .

The first supporting portion 11a is plate-shaped or block-shaped, but this shape is not limited to this. In addition to supporting the shaft member 12, the first supporting portion 11a also supports the electric motor 14 of the pressing mechanisms 7A and 7B. While the second supporting portion 11b is illustrated as a vertically extending strip-shaped member, this shape is not limited to this. The upper portion of the second supporting portion 11b is connected to the lower portion of the first supporting portion 11a, while the lower portion is supported by the position adjustment mechanism 8A or 8B.

The position adjustment mechanism 8A/8B includes a drive unit 19 that moves the base 11 of the pressing mechanism 7A/7B. The drive unit 19 comprises, for example, a linear actuator such as a ball screw mechanism driven by a servo motor or a linear servo motor. The position adjustment mechanism 8A/8B can linearly move the second support portion 11b of the base 11 along the cutting direction Y via the drive unit 19. In other words, the position adjustment mechanism 8A/8B adjusts the cutting position of the processing tool 5A/5B by moving the pressing mechanism 7A/7B.

The moving device 3 is disposed below each processing device 2A, 2B. The moving device 3 includes various types of transport devices, such as a rail transport device. The moving device 3 includes a guide portion 20 that guides the position adjustment mechanisms 8A, 8B. The moving device 3 moves each processing device 2A, 2B along the longitudinal direction of the end surface ES of the glass sheet G by moving the position adjustment mechanisms 8A, 8B in the conveying direction X. Furthermore, the glass sheet G is secured to a suction platen SP.

The moving device 3 is not limited to the above-described structure, and any device can be used as long as it can move the processing tools 5A, 5B and the glass sheet G relative to each other in the conveying direction X. For example, the moving device 3 can also be a device that transports the glass sheet G in the conveying direction X while the processing devices 2A, 2B are fixed without moving in the conveying direction X.

The control device 4 includes a computer (e.g., a personal computer, a control panel) equipped with various hardware components such as a central processing unit (CPU), a read-only memory (ROM), a random access memory (RAM), a hard disk drive (HDD), a monitor, and an input/output interface.

As shown in FIG3 , the control device 4 includes a calculation processing unit 21 that performs various calculations, a memory unit 22 that stores data or various programs required for processing the glass sheet G, a drive device control unit 23 that controls the drive devices 6A and 6B, a pressing mechanism control unit 24 that controls the pressing mechanisms 7A and 7B, a position adjustment mechanism control unit 25 that controls the position adjustment mechanisms 8A and 8B, and a moving device control unit 26 that controls the moving device 3. These components are interconnected by a bus.

The arithmetic processing unit 21 executes arithmetic processing required for controlling the drive devices 6A, 6B, the pressing mechanisms 7A, 7B, the position adjustment mechanisms 8A, 8B, and the moving device 3 based on various data and various programs stored in the memory unit 22.

The memory unit 22 stores data related to the dimensions of the glass sheet G, the type and rotational speed of the processing tools 5A and 5B, data related to the conveying speed, and data acquired from the pressing mechanisms 7A and 7B. Additionally, the memory unit 22 stores various programs for controlling the drive devices 6A and 6B, the pressing mechanisms 7A and 7B, the position adjustment mechanisms 8A and 8B, and the moving device 3.

The drive control unit 23 cooperates with the calculation processing unit 21 to send control signals to the drive units 6A and 6B. In this way, the drive control unit 23 performs control such as starting/stopping the electric motors in the drive units 6A and 6B and changing the rotation speed.

The pressing mechanism control unit 24 cooperates with the calculation processing unit 21 to send the signals required for the feedback control of the pressing mechanisms 7A and 7B to the pressing mechanisms 7A and 7B, thereby controlling the pressing force applied by the pressing mechanisms 7A and 7B to the processing tools 5A and 5B.

The pressing mechanism control unit 24 inputs data related to the rotation angle of the shaft 14a of the electric motor 14, received from the pressing mechanisms 7A and 7B, into the processing unit 21. Based on this rotation angle data, the processing unit 21 calculates the penetration position of each processing tool 5A and 5B. Based on the penetration position of the first processing tool 5A, the processing unit 21 calculates a correction value for adjusting the penetration position of the second processing tool 5B.

The position adjustment mechanism control unit 25 cooperates with the calculation processing unit 21 to send control signals to the position adjustment mechanisms 8A and 8B. In this way, the position adjustment mechanism control unit 25 controls the cutting position of each processing device 2A and 2B (processing tools 5A and 5B).

The moving device control unit 26 cooperates with the calculation processing unit 21 to send a control signal to the moving device 3. In this way, the moving device control unit 26 controls the moving speed of each processing device 2A, 2B in the conveying direction X.

A method for manufacturing a glass sheet G using the manufacturing apparatus 1 will be described below.

This method includes an end surface processing step in which the end surface ES of a glass sheet G, for example, cut from a large original glass sheet, is processed using processing devices 2A and 2B. The end surface processing step includes a first processing step in which the end surface ES of the glass sheet G is processed using the first processing device 2A, and a second processing step in which the end surface ES of the glass sheet G is processed using the second processing device 2B after the first processing step. While this embodiment illustrates an example in which the first processing step is a grinding step and the second processing step is a lapping step, the method is not limited to this. Specifically, both the first processing step and the second processing step may be grinding steps, or both may be lapping steps.

The first and second processing steps are performed by moving the first processing apparatus 2A and the second processing apparatus 2B simultaneously in a separate state along the conveying direction X. In this case, the first processing apparatus 2A first grinds the end surface ES of the glass sheet G, and then the second processing apparatus 2B grinds the end surface ES of the glass sheet G. Ideally, the movement speed of the first processing apparatus 2A in the conveying direction X is equal to the movement speed of the second processing apparatus 2B in the conveying direction X.

As shown in FIG. 4 , a reference position RP (reference position) indicated by a dotted line is set for the cutting position of the machining tools 5A and 5B.

In the first processing step and the second processing step, the control device 4 controls the pressing mechanisms 7A and 7B so that the processing tools 5A and 5B process the end surface ES of the glass plate G with a certain pressing pressure.

Furthermore, the control device 4 controls the second position adjustment mechanism 8B to adjust the cutting position of the second processing tool 5B according to the cutting position of the first processing tool 5A that previously processed the end surface ES of the glass sheet G (position adjustment step).

4 and 5 , the position adjustment step of the second processing tool 5B performed by the control device 4 will be described.

As shown in Figures 4-5 , when a protrusion P is present on the end surface ES of the glass sheet G, the first working tool 5A's penetration position changes as it passes over the protrusion P. This change in penetration position of the first working tool 5A causes the arm member 9 of the first pressing mechanism 7A to rotate and change its posture. The link mechanism 13 rotates the first link member 15 and the second link member 16 in response to the change in the posture of the arm member 9. This in turn causes the shaft 14a of the electric motor 14 connected to the link mechanism 13 to rotate.

The electric motor (servo motor) 14 of the first pressing mechanism 7A detects the rotational angle and torque of the shaft 14a while controlling the torque to maintain a constant pressure on the first working tool 5A (feedback control). Furthermore, the first pressing mechanism 7A transmits information regarding the angle of the shaft 14a detected by the electric motor 14, i.e., information (signal) regarding the cutting position of the first working tool 5A, to the pressing mechanism control unit 24 of the control device 4. The pressing mechanism control unit 24 then inputs the angle information of the shaft 14a into the calculation processing unit 21.

As shown in Figure 5, as the cutting position of the first processing tool 5A changes, a difference D occurs between the cutting position of the first processing tool 5A and the cutting position (reference position RP) of the second processing tool 5B. The processing unit 21 of the control device 4 calculates the cutting position of the first processing tool 5A based on the angle information about the shaft 14a of the electric motor 14 received from the first processing device 2A (first pressing mechanism 7A). The processing unit 21 calculates the cutting position of the second processing tool 5B based on the angle information about the shaft 14a of the electric motor 14 received from the second processing device 2B (second pressing mechanism 7B).

The calculation processing unit 21 calculates the difference D between the calculated cutting positions of the first processing tool 5A and the second processing tool 5B. The calculation processing unit 21 sets this difference D as a correction value for adjusting the cutting position of the second processing tool 5B. The control device 4 transmits a control signal related to the correction value D calculated by the calculation processing unit 21 to the second position adjustment mechanism 8B via the position adjustment mechanism control unit 25.

Based on a control signal related to the correction value D received from the control device 4, the second position adjustment mechanism 8B moves the base 11 of the second pressing mechanism 7B in the cutting direction Y. This changes the cutting position of the second processing tool 5B. The second processing device 2B uses the changed cutting position of the second processing tool 5B as the reference position RP and performs grinding of the protrusion P using the second processing tool 5B. By performing this position adjustment along the entire length of the end surface ES of the glass sheet G, the second processing tool 5B moves in a manner similar to that of the first processing tool 5A, grinding the entire end surface ES of the glass sheet G with a constant pressing force.

According to the method and apparatus 1 for manufacturing a glass sheet G of the present embodiment described above, by adjusting the penetration position of the second working tool 5B (the position of the second pressing mechanism 7B) using the second position adjustment mechanism 8B according to the penetration position of the first working tool 5A in the first processing step, the second pressing mechanism 7B can be moved to an optimal position according to the shape or position of the end surface ES of the glass sheet G. Furthermore, by adjusting the penetration position of the second working tool 5B using the second position adjustment mechanism 8B, the arm member 9 of the second pressing mechanism 7B can be positioned to maintain a constant pressure on the second working tool 5B. This allows the pressing force applied to the second working tool 5B by the second pressing mechanism 7B to be constant, allowing the end surface ES of the glass sheet G to be processed to a desired processing volume.

As a result, even if the end surface ES of the glass sheet G is not straight in its longitudinal direction and deviates partially from the predetermined cutting line, the end surface ES of the glass sheet G can be processed with the desired processing depth. Alternatively, even if the glass sheet G is positionally misaligned during the first and second processing steps, the end surface ES of the glass sheet G can be processed with the desired processing depth. Therefore, positioning of the glass sheet G during end surface processing can be simplified.

Furthermore, the present invention is not limited to the structure of the above-mentioned embodiment, nor is it limited to the above-mentioned effects, but can be modified in various ways without departing from the scope of the present invention.

While the above embodiment illustrates an example in which the end surface ES of the glass sheet G is processed using the first processing device 2A and the second processing device 2B, the number of processing devices that process the glass sheet G is not limited thereto. While the above embodiment illustrates an example in which the glass sheet G is processed starting with the first processing device 2A, the present invention is not limited thereto and may be applied using any of the plurality of processing devices as the first processing device and any subsequent processing devices as the second processing device.

1: Manufacturing device 2A: First processing device (processing device) 2B: Second processing device (processing device) 3: Moving device 4: Control device 5A: First processing tool (processing tool) 5B: Second processing tool (processing tool) 6A: First drive device (drive device) 6B: Second drive device (drive device) 7A: First pressing mechanism (pressing mechanism) 7B: Second pressing mechanism (pressing mechanism) 8A: First position adjustment mechanism (position adjustment mechanism) 8B: Second position adjustment mechanism (position adjustment mechanism) 9: Arm member (support member) 10: Drive unit 11: Base 11a: First support unit 1 1b: Second support unit 12: Support shaft 13: Link mechanism 14: Electric motor (servo motor) 14a: Shaft 15: First link member 16: Second link member 17: First joint 18: Second joint 19: Drive unit 20: Guide unit 21: Arithmetic processing unit 22: Memory unit 23: Drive device control unit 24: Pressing mechanism control unit 25: Position adjustment mechanism control unit 26: Moving device control unit ES: Glass sheet end surface D: Difference G: Glass sheet P: Protrusion RP: Reference position SP: Suction platen X: Transport direction Y: Cutting direction II-II: Arrow view line

Figure 1 is a plan view of a glass sheet manufacturing apparatus. Figure 2 is a side view of the manufacturing apparatus viewed along the line II-II in Figure 1. Figure 3 is a functional block diagram of a control device. Figure 4 is a plan view illustrating a step in the glass sheet manufacturing method. Figure 5 is a plan view illustrating a step in the glass sheet manufacturing method.

1: Manufacturing equipment

2A: First processing device (processing device)

2B: Second processing device (processing device)

3: Mobile devices

4: Control device

5A: First processing tool (processing tool)

5B: Second processing tool (processing tool)

6A: First drive device (drive device)

6B: Second drive unit (drive unit)

7A: First pressing mechanism (pressing mechanism)

7B: Second pressing mechanism (pressing mechanism)

8A: First position adjustment mechanism (position adjustment mechanism)

8B: Second position adjustment mechanism (position adjustment mechanism)

9: Arm member (support member)

10: Drive unit

11:Abutment

12: Support shaft component

13: Connecting rod mechanism

14: Electric motor (servo motor)

14a: Shaft

15: First connecting rod component

16: Second connecting rod component

17: First connector

18: Second connector

20: Guidance Department

ES: End face of glass sheet

G: Glass Plate

SP: Adsorption platen

X: Transport direction

Y: Cutting direction

II-II: Arrow view line

Claims (5)

A method for manufacturing a glass plate includes: a first processing step of processing an end surface of the glass plate using a first processing device; and a second processing step of processing the end surface of the glass plate using a second processing device after the first processing step. The method for manufacturing a glass plate is characterized in that the first processing device includes: a first processing tool for processing the end surface of the glass plate; and a first pressing mechanism for applying a pressing force to the first processing tool to press the end surface of the glass plate, and the second processing device includes: a second processing tool for processing the end surface of the glass plate; a second pressing mechanism for applying a pressing force to the second processing tool to press the end surface of the glass plate; and a position adjustment mechanism for changing the position of the second processing tool relative to the glass plate by moving the second pressing mechanism. The glass sheet manufacturing method includes a position adjustment step, wherein the position adjustment mechanism adjusts the cutting position of the second processing tool in the second processing step by a control device in a manner that mimics the position of the first processing tool in the first processing step. In the position adjustment step, when the first processing tool moves from a reference position set by the first processing tool of the first processing device, the control device obtains position information of the first processing tool after the movement and calculates a correction value relative to the position of the second processing tool based on the position information of the first processing tool and the reference position information of the second processing tool of the second processing device. In the position adjustment step, the control device adjusts the cutting position of the second processing tool based on the correction value. The glass sheet manufacturing method of claim 1, wherein the second pressing mechanism includes: a supporting member that supports the second processing tool and changes its posture by rotating about a predetermined axis; a connecting rod mechanism connected to the supporting member; and a servo motor that drives the connecting rod mechanism. The glass sheet manufacturing method according to claim 2, wherein the control device controls the position adjustment mechanism to adjust the cutting position of the second working tool so that the rotation angle of the support member varies within a range of ±0.7°, thereby maintaining the pressing force of the second working tool constant. The method for manufacturing a glass sheet according to any one of claims 1 to 3, wherein in the first processing step and the second processing step, the first processing tool and the second processing tool are moved relative to the glass sheet along a predetermined conveying direction. A glass sheet manufacturing apparatus comprises: a first processing apparatus for processing an end surface of a glass sheet; a second processing apparatus for processing the end surface of the glass sheet processed by the first processing apparatus; and a control apparatus. The glass sheet manufacturing apparatus is characterized in that the first processing apparatus comprises: a first processing tool for processing the end surface of the glass sheet; and a first pressing mechanism for applying a pressing force to the first processing tool to press the end surface of the glass sheet; and the second processing apparatus comprises: a second processing tool for processing the end surface of the glass sheet; a second pressing mechanism for applying a pressing force to the second processing tool to press the end surface of the glass sheet; and a position adjustment mechanism for changing the position of the second processing tool by moving the second pressing mechanism. The control device is configured to adjust the cutting position of the second processing tool in the second processing device relative to the cutting position of the end surface of the glass sheet by operating the position adjustment mechanism in a manner that mimics the position of the first processing tool in the first processing device. When the first processing tool moves from a reference position set for the first processing tool in the first processing device, the control device obtains position information of the first processing tool after the movement and calculates a correction value relative to the position of the second processing tool based on the position information of the first processing tool and the reference position information set for the second processing tool in the second processing device. The control device adjusts the cutting position of the second processing tool based on the correction value.