Method of manufacturing glass sheet and manufacturing apparatus

Abstract

A method for manufacturing a glass sheet includes a first processing step of processing an end surface (ES) of a glass sheet (G) by a first processing device (2A), and a second processing step of processing the end surface (ES) of the glass sheet (G) by a second processing device (2B) after the first processing step. A position adjusting mechanism (8B) of the second processing device (2B) adjusts a cutting-in position of a second tool (5B) of the second processing device (2B) in the second processing step in imitation of a position of a first tool (5A) of the first processing device (2A) in the first processing step.

Description

Technical Field

[0001] This invention relates to a method and apparatus for manufacturing glass plates. Background Technology

[0002] Glass sheets are used as substrates and cover glass in displays such as liquid crystal displays. The manufacturing process involves cutting one or more glass sheets from a large raw glass sheet (forming sheet). This allows glass sheets of the desired size to be obtained.

[0003] On the other hand, sometimes there are minor damages (defects) on the end faces of the glass sheets cut from the original glass sheet. When damage exists on the end faces of the glass sheet, cracking or other problems can occur due to this damage. To prevent this defect, for example, grinding (roughing) or lapping (finishing) is performed on the end faces of the glass sheet.

[0004] As an apparatus for such processing, for example, Patent Document 1 discloses a processing apparatus having a support member (arm member) for supporting the processing tool and a pressing mechanism (servo mechanism) for generating a force on the end face of the glass plate by the processing tool.

[0005] In this processing apparatus, one end of the support member supports the tool and allows it to rotate. The other end of the support member is connected to a pressing mechanism. The middle portion of the support member is supported by a support shaft member. The support member changes its orientation by rotating about the support shaft member (axis).

[0006] The pressing mechanism includes a linkage mechanism connected to the other end of the support member and a servo motor that drives the linkage mechanism. By using the servo motor to drive the linkage mechanism, the pressing mechanism controls the posture (rotation angle) of the support member in a constant manner with the pressing force of the tool on the end face of the glass plate.

[0007] Existing technical documents

[0008] Patent documents

[0009] Patent Document 1: Japanese Patent Application Publication No. 2017-30089 Summary of the Invention

[0010] The problem that the invention aims to solve

[0011] In the aforementioned processing apparatus, by utilizing a support member and a pressing mechanism to maintain a constant pressing force on the processing tool, the end face of the glass plate can be processed with the desired processing amount.

[0012] However, the pressing force applied to the tool by the pressing mechanism varies strictly according to the position of the tool. For example, in the pressing mechanism described in Patent Document 1, even if the torque of the servo motor is kept constant, the pressing force applied to the tool varies depending on the posture (rotation angle) of the support member. Therefore, for example, if the dimensions of the glass plate deviate during cutting, or if the glass plate shifts position during processing by the tool, it is difficult to control the pressing force of the tool applied by the pressing mechanism with high precision. In such cases, the variation in pressing force may result in excessive or insufficient processing.

[0013] The present invention was made in view of the above circumstances, and the technical problem is to process the end face of the glass plate with a desired processing amount.

[0014] Solution for solving the problem

[0015] This invention provides a method for manufacturing a glass plate to solve the aforementioned problems, comprising: a first processing step of processing an end face of a glass plate using a first processing device; and a second processing step of processing the end face of the glass plate using a second processing device after the first processing step. The method is characterized in that the first processing device includes: a first processing tool for processing the end face of the glass plate; and a first pressing mechanism that applies a pressing force to the first processing tool to press the end face of the glass plate. The second processing device includes: a second processing tool for processing the end face of the glass plate; a second pressing mechanism that applies a pressing force to the second processing tool to press the end face of the glass plate; and a position adjustment mechanism that changes the cutting position of the second processing tool relative to the end face 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.

[0016] According to this structure, corresponding to the cutting position of the first processing tool in the first processing step, the cutting position of the second processing tool (the position of the second pressing mechanism) is adjusted by the position adjustment mechanism, thereby enabling the second pressing mechanism to move to a preferred position in accordance with the shape and position of the end face of the glass plate. Thus, the pressing force exerted by the second pressing mechanism on the second processing tool can be set to a constant, allowing the end face of the glass plate to be processed with the desired processing amount.

[0017] In this method, the second pressing mechanism may also include: a support member that supports the second tool and whose posture can be changed by rotating about a predetermined axis; a linkage mechanism connected to the support member; and a servo motor that drives the linkage mechanism.

[0018] In the second pressing mechanism, which includes a support member and a linkage mechanism, the pressing force applied to the second processing tool can be easily varied according to the posture (rotation angle) of the support member. If the present invention is applied to such a second pressing mechanism, the effect of processing the end face of the glass plate with the desired processing amount becomes even more significant.

[0019] In this method, the position adjustment mechanism may also adjust the cutting position of the second tool in a manner that keeps the posture of the support member constant.

[0020] According to this structure, by adjusting the cutting position of the second processing tool by the position adjustment mechanism, the posture of the support member becomes approximately constant, thus enabling the second processing tool to be applied with the pressure most suitable for processing the end face of the glass plate. For example, where the variation in the posture (rotation angle) of the support member is conventionally within ±2°, according to the present invention, the variation in the posture (rotation angle) of the support member can be set to ±0.7°.

[0021] In this method, the first and second processing tools can be moved relative to the glass plate along a predetermined feed direction during the first and second processing steps. This allows for the high-precision processing of the entire end face of the glass plate.

[0022] The present invention provides a glass plate manufacturing apparatus for solving the aforementioned problems, comprising: a first processing apparatus for processing an end face of a glass plate; a second processing apparatus for processing the end face of the glass plate already processed by the first processing apparatus; and a control device. The glass plate manufacturing apparatus is characterized in that the first processing apparatus includes: a first processing tool for processing the end face of the glass plate; and a first pressing mechanism for applying a pressing force to the first processing tool to press the end face of the glass plate; the second processing apparatus includes: a second processing tool for processing the end face of the glass plate; a second pressing mechanism for applying a pressing force to the second processing tool to press the end face of the glass plate; and a position adjustment mechanism for changing the cutting position of the second processing tool relative to the end face of the glass plate by moving the second pressing mechanism; and the control device for adjusting the cutting position of the second processing tool in the second processing apparatus in a manner mimicking the position of the first processing tool in the first processing apparatus by actuating the position adjustment mechanism.

[0023] According to this structure, corresponding to the cutting position of the first processing tool in the first processing device, the cutting position of the second processing tool (the position of the second pressing mechanism) is adjusted by a control device and a position adjustment mechanism, thereby enabling the second pressing mechanism to move to a preferred position in accordance with the shape and position of the end face of the glass plate. Thus, the pressing force applied by the second pressing mechanism to the second processing tool can be set to a constant, allowing the end face of the glass plate to be processed with the desired processing amount.

[0024] Invention Effects

[0025] According to the present invention, the end face of the glass plate can be processed with a desired processing amount. Attached Figure Description

[0026] Figure 1 This is a top view showing the glass manufacturing apparatus.

[0027] Figure 2 yes Figure 1 A side view of the manufacturing apparatus from the perspective of line II-II.

[0028] Figure 3 This is a functional block diagram of the control device.

[0029] Figure 4 This is a top view showing one step in the manufacturing process of a glass plate.

[0030] Figure 5 This is a top view showing one step in the manufacturing process of a glass plate. Detailed Implementation

[0031] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figures 1 to 5 An embodiment of the method for manufacturing the glass plate of the present invention is shown.

[0032] Figures 1 to 3 A glass plate manufacturing apparatus used in this method is shown. The manufacturing apparatus 1 includes a first processing device 2A, a second processing device 2B, a moving device 3 for moving the first processing device 2A and the second processing device 2B, and a control device 4 for controlling each processing device 2A, 2B and the moving device 3. Figure 1 As shown, the manufacturing apparatus 1 processes the end face ES of the glass plate G while the moving device 3 moves along the specified feed direction X.

[0033] like Figure 1 as well as Figure 2As shown, the first processing device 2A includes a first processing tool 5A, a first driving device 6A for driving the first processing tool 5A, a first pressing mechanism 7A for applying a force to the first processing tool 5A to press the glass plate G, and a first position adjusting mechanism 8A for adjusting the position of the first processing tool 5A by moving the first pressing mechanism 7A.

[0034] The second processing apparatus 2B includes a second processing tool 5B, a second driving device 6B for driving the second processing tool 5B, a second pressing mechanism 7B for applying a pressing force to the glass plate G to the second processing tool 5B, and a second position adjusting mechanism 8B for adjusting the position of the second processing tool 5B by moving the second pressing mechanism 7B.

[0035] Each tool 5A, 5B is, for example, a rotatable grinding stone (grinding stone or abrasive stone). Each tool 5A, 5B is connected to each drive device 6A, 6B and is rotatably supported on a part of each pressing mechanism 7A, 7B.

[0036] Each drive unit 6A and 6B is composed of an electric motor that drives the rotation of each tool 5A and 5B. Synchronous motors, asynchronous motors, servo motors, etc., are used as electric motors. Each drive unit 6A and 6B is supported on a portion of each pressing mechanism 7A and 7B.

[0037] like Figure 1 as well as Figure 2 As shown, each pressing mechanism 7A, 7B includes an arm member 9 that serves as a support member supporting each tool 5A, 5B so as to be rotatable, a drive part 10 that drives the arm member 9, and a base 11 that supports the arm member 9 and the drive part 10.

[0038] The arm member 9 is, for example, composed of a long strip-shaped plate member, but the shape of the arm member 9 is not limited to this embodiment. One end of the arm member 9 supports the tools 5A and 5B and the drive devices 6A and 6B. The other end of the arm member 9 is connected to the drive unit 10.

[0039] The middle portion of the arm member 9 is supported by the support shaft member 12. The arm member 9 is configured to rotate (oscillate) about the support shaft member 12 as a center (axis). The arm member 9 can adjust the position (hereinafter referred to as the "cut-in position") of the processing tools 5A and 5B in the direction orthogonal to the feed direction X (hereinafter referred to as the "cut-in direction") by its rotation. In other words, the arm member 9 can adjust the force (pressing force) of the processing tools 5A and 5B pressing the glass plate G by its rotation.

[0040] The drive unit 10 includes a linkage mechanism 13 connected to the arm member 9 and an electric motor 14 that drives the linkage mechanism 13.

[0041] Each linkage mechanism 13 includes a first linkage member 15 and a second linkage member 16. One end of the first linkage member 15 is fixed to the shaft (rotation shaft) 14a of the electric motor 14, and the other end of the first linkage member 15 is rotatably connected to the second linkage member 16 via a first connector 17. One end of the second linkage member 16 is connected to the first linkage member 15, and the other end of the second linkage member 16 is rotatably connected to the end of the arm member 9 via a second connector 18.

[0042] The pressing mechanisms 7A and 7B, through the linkage mechanism 13, cause the rotational force of the shaft 14a of the electric motor 14 to act as torque on the arm member 9. The arm member 9 uses this torque to cause the tools 5A and 5B to generate pressing force on the glass plate G.

[0043] The electric motor 14 is, for example, a servo motor. The electric motor 14 drives the linkage mechanism 13 in a manner that maintains a constant pressing pressure of each tool 5A, 5B on the glass plate G. That is, the electric motor 14 adjusts the driving force of the linkage mechanism 13 on the arm member 9 based on torque through its feedback control.

[0044] Pressing mechanisms 7A and 7B are connected to the control device 4 in a communicative manner. Pressing mechanisms 7A and 7B can send information about the torque of the electric motor 14 and the rotation angle of the shaft 14a to the control device 4.

[0045] like Figure 2 As shown, the base 11 has a first support portion 11a that supports the arm member 9 via the support shaft member 12 and a second support portion 11b that supports the first support portion 11a.

[0046] The first support portion 11a is configured as a plate or a block, but its shape is not limited to this embodiment. In addition to the support shaft member 12, the first support portion 11a also supports the electric motors 14 of the pressing mechanisms 7A and 7B. The second support portion 11b is exemplified as a long strip extending in the vertical direction, but its shape is not limited to this embodiment. The upper part of the second support portion 11b is connected to the lower part of the first support portion 11a. The lower part of the second support portion 11b is supported by the adjustment mechanisms 8A and 8B.

[0047] The position adjustment mechanisms 8A and 8B include a drive unit 19 that moves the base 11 of the pressing mechanisms 7A and 7B. The drive unit 19 is, for example, a linear actuator such as a ball screw mechanism driven by a servo motor or a linear servo motor. The position adjustment mechanisms 8A and 8B can use the drive unit 19 to move the second support portion 11b of the base 11 linearly along the cutting direction Y. That is, the position adjustment mechanisms 8A and 8B adjust the cutting position of the tools 5A and 5B by moving the pressing mechanisms 7A and 7B.

[0048] The moving device 3 is positioned below each of the processing devices 2A and 2B. The moving device 3 is composed of various transport devices, such as a guide rail transport device. The moving device 3 includes guide sections 20 that guide the position adjustment mechanisms 8A and 8B. By moving the position adjustment mechanisms 8A and 8B along the feed direction X, the moving device 3 causes each of the processing devices 2A and 2B to move along the length direction of the end face ES of the glass plate G. It should be noted that the glass plate G is fixed to the adsorption platform SP.

[0049] The moving device 3 is not limited to the structure described above, and can be used to move the processing tools 5A and 5B relative to the glass plate G along the feed direction X. The moving device 3 can also transport the glass plate G along the feed direction X in a fixed state, for example, without moving the processing devices 2A and 2B along the feed direction X.

[0050] Control device 4 may include, for example, a computer (e.g., PC, console) that has various hardware installed, such as CPU, ROM, RAM, HDD, monitor, input / output interfaces, etc.

[0051] like Figure 3 As shown, the control device 4 includes: an arithmetic processing unit 21 that performs various calculations; a storage unit 22 that stores data and various programs required for processing the glass plate 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 busbar.

[0052] The arithmetic processing unit 21 performs arithmetic processing required 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 based on various data and programs stored in the storage unit 22.

[0053] The storage unit 22 stores data such as the dimensions of the glass plate G, the types of tools 5A and 5B, rotation speed, feed speed, and data obtained from the pressing mechanisms 7A and 7B. Furthermore, the storage unit 22 stores various programs used to control the drive devices 6A and 6B, the pressing mechanisms 7A and 7B, the position adjustment mechanisms 8A and 8B, and the moving device 3.

[0054] The drive unit control unit 23 cooperates with the arithmetic processing unit 21 and sends control signals to the drive units 6A and 6B. As a result, the drive unit control unit 23 performs controls such as starting, stopping, and changing the rotation speed of the electric motors of the drive units 6A and 6B.

[0055] The pressing mechanism control unit 24 cooperates with the arithmetic processing unit 21 and sends the signals required for feedback control of the pressing mechanisms 7A and 7B to the pressing mechanisms 7A and 7B. Thus, the pressing mechanism control unit 24 controls the pressing force applied by the pressing mechanisms 7A and 7B to the tools 5A and 5B.

[0056] 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 to the calculation processing unit 21. The calculation processing unit 21 can calculate the cutting position of each processing tool 5A and 5B based on the rotation angle data. The calculation processing unit 21 can calculate a correction value for adjusting the cutting position of the second processing tool 5B based on the cutting position of the first processing tool 5A.

[0057] The position adjustment mechanism control unit 25 cooperates with the arithmetic processing unit 21 and sends control signals to the position adjustment mechanisms 8A and 8B. As a result, the position adjustment mechanism control unit 25 controls the cutting position of each processing device 2A and 2B (adding tools 5A and 5B).

[0058] The mobile device control unit 26 cooperates with the arithmetic processing unit 21 and sends control signals to the mobile device 3. As a result, the mobile device control unit 26 controls the moving speed of each processing device 2A and 2B in the feed direction X.

[0059] The method for manufacturing glass plate G using the manufacturing apparatus 1 described above will be explained below.

[0060] This method includes end-face processing steps for processing, for example, the end face ES of a glass plate G cut from a large glass substrate using processing devices 2A and 2B. The end-face processing steps include: a first processing step, in which the end face ES of the glass plate G is processed using the first processing device 2A; and a second processing step, in which the end face ES of the glass plate G is processed using the second processing device 2B after the first processing step. In this embodiment, an example is shown where the first processing step is a grinding process and the second processing step is a polishing process, but the method is not limited to this structure. Specifically, both the first and second processing steps can be grinding processes, or both can be polishing processes.

[0061] The first and second processing steps are performed by simultaneously moving the first processing device 2A and the second processing device 2B in a separated state along the feed direction X. In this case, the first processing device 2A first grinds the end face ES of the glass plate G, and then the second processing device 2B grinds the end face ES of the glass plate G. It is desirable that the moving speed of the first processing device 2A in the feed direction X is equal to the moving speed of the second processing device 2B in the feed direction X.

[0062] like Figure 4As shown, on tools 5A and 5B, a reference position RP (reference position) is set with a single-dash line indicating the cutting position.

[0063] In the first and second processing steps, the control device 4 controls the pressing mechanisms 7A and 7B in such a way that each tool 5A and 5B processes the end face ES of the glass plate G with a constant pressing pressure.

[0064] In addition, 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 on the end face ES of the glass plate G that has been processed previously (position adjustment process).

[0065] The following is for reference Figure 4 as well as Figure 5 The position adjustment process of the second tool 5B performed by the control device 4 will be described.

[0066] like Figure 4 as well as Figure 5 As shown, when a protrusion P exists on the end face ES of the glass plate G, the cutting position of the first processing tool 5A changes as it passes through the protrusion P. Based on this change in the cutting position of the first processing tool 5A, the arm member 9 of the first pressing mechanism 7A rotates and changes its posture. The linkage mechanism 13 causes the first link member 15 and the second link member 16 to rotate according to the change in posture of the arm member 9. Consequently, the shaft 14a of the electric motor 14 connected to the linkage mechanism 13 rotates.

[0067] The electric motor (servo motor) 14 of the first pressing mechanism 7A maintains constant torque (feedback control) by detecting the rotation angle and torque of the shaft 14a while keeping the pressing force of the first processing tool 5A constant. Furthermore, the first pressing mechanism 7A sends information (signals) about the angle of the shaft 14a detected by the electric motor 14, i.e., information related to the cutting position of the first processing tool 5A, to the pressing mechanism control unit 24 of the control device 4. The pressing mechanism control unit 24 inputs the angle information of the shaft 14a to the arithmetic processing unit 21.

[0068] like Figure 5 As shown, when the cutting position of the first machining tool 5A changes, a difference D is generated between the cutting position of the first machining tool 5A and the cutting position (reference position RP) of the second machining tool 5B. The arithmetic processing unit 21 of the control device 4 calculates the cutting position of the first machining tool 5A based on the angle information of the shaft portion 14a of the electric motor 14 received from the first processing device 2A (first pressing mechanism 7A). The arithmetic processing unit 21 calculates the cutting position of the second machining tool 5B based on the angle information of the shaft portion 14a of the electric motor 14 received from the second processing device 2B (second pressing mechanism 7B).

[0069] The arithmetic processing unit 21 calculates the difference D between the cutting position of the first processing tool 5A and the cutting position of the second processing tool 5B. The arithmetic 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 sends the control signal of the correction value D calculated by the arithmetic processing unit 21 to the second position adjustment mechanism 8B through the position adjustment mechanism control unit 25.

[0070] The second position adjustment mechanism 8B moves the base 11 of the second pressing mechanism 7B along the cutting direction Y based on a control signal of the correction value D received from the control device 4. 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 a reference position RP and performs grinding processing on the protrusion P by the second processing tool 5B. By performing the aforementioned position adjustment over the entire length of the end face ES of the glass plate G, the second processing tool 5B moves in a manner similar to the first processing tool 5A while grinding the entire end face ES of the glass plate G with a constant pressing pressure.

[0071] According to the glass plate G manufacturing method and manufacturing apparatus 1 of this embodiment described above, the second position adjustment mechanism 8B adjusts the cutting position of the second processing tool 5B (the position of the second pressing mechanism 7B) in accordance with the cutting position of the first processing tool 5A in the first processing step. This allows the second pressing mechanism 7B to be moved to a preferred position in accordance with the shape and position of the end face ES of the glass plate G. Furthermore, by adjusting the cutting position of the second processing tool 5B using the second position adjustment mechanism 8B, the arm member 9 in the second pressing mechanism 7B can be positioned to maintain a constant pressing force of the second processing tool 5B. Therefore, the pressing force applied by the second pressing mechanism 7B to the second processing tool 5B can be kept constant, and the end face ES of the glass plate G can be processed with the desired processing amount.

[0072] As a result, for example, even if the end face ES of the glass plate G is not straight along its length but is partially offset from the predetermined cutting line, the end face ES of the glass plate G can still be processed with the desired processing amount. Alternatively, even if the glass plate G experiences a positional shift during the first and second processing steps, the end face ES of the glass plate G can still be processed with the desired processing amount. Therefore, the positioning of the glass plate G can be simplified during end face processing.

[0073] It should be noted that the present invention is not limited to the structure of the above-described embodiments, nor is it limited to the effects described above. Various modifications can be made to the present invention without departing from its spirit.

[0074] In the above embodiments, an example is shown of processing the end face ES of a glass plate G using a first processing device 2A and a second processing device 2B. However, the number of processing devices used to process the glass plate G is not limited to this embodiment. In the above embodiments, it is shown that the first processing device 2A processes the glass plate G first, but it is not limited to this. Alternatively, any processing device among a plurality of processing devices can be used as the first processing device, and any subsequent processing device can be used as the second processing device, and the present invention can be applied.

[0075] Explanation of reference numerals in the attached figures

[0076] 1 Manufacturing apparatus

[0077] 2A First Processing Unit

[0078] 2B Second Processing Unit

[0079] 4. Control device

[0080] 5A First Addition Tool

[0081] 5B Second Addition Tool

[0082] 7A First pressing mechanism

[0083] 7B Second pressing mechanism

[0084] 8B Second Position Adjustment Mechanism

[0085] 9. Arm components (support components)

[0086] 13. Linkage Mechanism

[0087] 14. Electric motor (servo motor)

[0088] ES glass plate end face

[0089] G glass plate

[0090] X is the feed direction.

Claims

1. A method for manufacturing a glass plate, comprising: The first processing step involves processing the end face of the glass plate using a first processing device; and the second processing step involves processing the end face of the glass plate using a second processing device after the first processing step. The method for manufacturing the glass plate is characterized in that, The first processing apparatus includes: a first processing tool for processing the end face of the glass plate; and a first pressing mechanism for applying a pressing force to the first processing tool to press the end face of the glass plate. The second processing apparatus includes: a second processing tool for processing the end face of the glass plate; a second pressing mechanism for applying a pressing force to the second processing tool to press against the end face of the glass plate; and a position adjusting mechanism for changing the cutting position of the second processing tool relative to the end face of the glass plate by moving the second pressing mechanism. The method for manufacturing the glass plate includes a position adjustment step that uses a control device to control the position adjustment mechanism to adjust 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. In the position adjustment process, when the first machining tool moves from a reference position set for the first machining tool on the first processing device, the control device acquires the position information of the moved first machining tool, and calculates a correction value for the position of the second machining tool based on the position information of the first machining tool and the reference position information set for the second machining tool on the second processing device. In the position adjustment process, the control device adjusts the cutting position of the second tooling tool based on the correction value.

2. The method for manufacturing a glass plate according to claim 1, wherein, The second pressing mechanism comprises: a support member that supports the second tool and whose posture can be changed by rotating about a predetermined axis; a linkage mechanism connected to the support member; and a servo motor that drives the linkage mechanism.

3. The method for manufacturing a glass plate according to claim 2, wherein, The control device controls the position adjustment mechanism to adjust the cutting position of the second processing tool in such a way that the rotation angle of the support member varies within a range of ±0.7°, thereby maintaining the pressing force of the second processing tool at a constant level.

4. The method for manufacturing a glass plate 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 plate along a predetermined feed direction.

5. A glass plate manufacturing apparatus, comprising: a first processing unit for processing an end face of a glass plate; a second processing unit for processing the end face of the glass plate processed by the first processing unit; and a control unit. The glass plate manufacturing apparatus is characterized in that, The first processing apparatus includes: a first processing tool for processing the end face of the glass plate; and a first pressing mechanism for applying a pressing force to the first processing tool to press the end face of the glass plate. The second processing apparatus includes: a second processing tool for processing the end face of the glass plate; a second pressing mechanism for applying a pressing force to the second processing tool to press against the end face of the glass plate; and a position adjusting mechanism for changing the cutting position of the second processing tool relative to the end face of the glass plate by moving the second pressing mechanism. The control device is configured to adjust the cutting position of the second tool in the second processing device by actuating the position adjustment mechanism, thereby mimicking the position of the first tool in the first processing device. When the first machining tool moves from a reference position set for the first machining tool on the first processing device, the control device acquires the position information of the first machining tool after the movement, and calculates a correction value for the position of the second machining tool based on the position information of the first machining tool and the reference position information set for the second machining tool on the second processing device. The control device adjusts the cutting position of the second tool based on the correction value.

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