JP5387915B2 - Cutter traveling control method and sheet glass cutting method - Google Patents

Description

  The present invention relates to a cutter traveling control method for cutting a sheet glass and a sheet glass cutting method.

  2. Description of the Related Art Conventionally, there has been known a method of making a cut line on a surface of a sheet glass conveyed in a certain direction in a non-stop manner (see FIGS. 13 and 14). As shown in these drawings, a wheel cutter or the like along a guide frame 112 disposed in a posture inclined at an angle θ downstream of the conveyance direction with respect to a direction orthogonal to the conveyance direction of the plate glass 132 (conveyance speed: v). The cutter 114 is caused to travel at a traveling speed: w = v / cos θ. As a result, a cut line substantially perpendicular to the transport direction can be made on the surface of the plate glass 132 (see, for example, Patent Document 1).

JP-A-8-231239

  However, because the guide frame 112 may have a wavy shape instead of an ideal straight line as designed due to various causes (see FIG. 8), when the cutter 114 travels along the guide frame 112, it is caused by the waviness. Thus, there is a problem that a cut line containing a swell component enters the surface of the plate glass 132 (see FIG. 7B).

  The present invention has been made in view of such circumstances, and even if the guide frame is not an ideal straight line and has a wavy shape, it is not affected by the waviness, or is hardly affected, It is an object of the present invention to provide a cutter traveling control method capable of making a cut line substantially perpendicular to the conveying direction on the surface of a plate glass.

  That is, in order to achieve the above object, the invention according to claim 1 is a plate glass that travels along a guide frame and is conveyed in a certain direction (a state of a continuous plate-like object before being cut in a lateral direction). In a glass cutting machine comprising: a cutter for making a cutting line in a glass ribbon; and a control device for controlling the traveling speed of the cutter based on a cutter traveling speed control pattern in which an elapsed time and a cutter speed are associated with each other. In the cutter traveling control method, when the apparent traveling speed of the cutter after time t is slower than the cutter speed corresponding to the elapsed time t in the cutter speed control pattern, the undulation of the cutting line is absorbed. The step of positively correcting the cutter speed corresponding to the elapsed time t in the cutter speed control pattern, and the apparent traveling speed of the cutter after the time t, If the cutter speed is faster than the cutter speed corresponding to the elapsed time t in the cutter speed control pattern, the cutter speed corresponding to the elapsed time t in the cutter speed control pattern is negatively corrected so as to absorb the waviness of the cutting line. And a step of controlling the travel of the cutter.

  The invention according to claim 2 provides the cutter traveling control method according to claim 1, wherein the thickness of the plate glass is 0.1 to 5 mm.

  The invention according to claim 3 provides the cutter traveling control method according to claim 1, wherein the thickness of the plate glass is 0.1 to 0.7 mm.

  According to a fourth aspect of the present invention, there is provided the cutter travel control method according to the first, second or third aspect, wherein the conveyance speed is 0.1 to 0.5 m / s.

  According to a fifth aspect of the present invention, there is provided the cutter travel control method according to the first, second, third, or fourth aspect, wherein the width of the plate glass is 1500 mm to 6000 mm.

  According to a sixth aspect of the present invention, there is provided the cutter traveling control method according to the first, second, third, fourth or fifth aspect, wherein the traveling speed of the cutter is 0.2 to 2 m / s.

  A seventh aspect of the present invention provides a cutter travel control method according to the first, second, third, fourth, fifth or sixth aspect of the present invention, wherein the cutter is caused to travel by a linear servo motor.

  Invention of Claim 8 provides the cutting method of the plate glass which cut | disconnects plate glass in the position of the said cut line in the traveling control method of the cutter of any one of Claims 1-7.

  According to a ninth aspect of the present invention, the plate glass is a mother glass substrate for a flat panel display, and the portion cut by the cutting line is the position of the end portion of the mother glass substrate. Provide a method.

  According to a tenth aspect of the present invention, a second cutting process in a direction substantially orthogonal to the first cutting based on the cut line is performed, and the plate glass is formed on a rectangular mother glass substrate. A method for cutting flat glass is provided.

  Invention of Claim 11 provides the cutting method of the plate glass of Claim 8, 9 or 10 which chamfers about the end surface of the 1st cutting | disconnection and 2nd cutting | disconnection of plate glass.

  The invention according to claim 12 provides the method for cutting a plate glass according to claim 11, wherein the size of the mother glass substrate is determined by chamfering.

  In the present invention, even if the guide frame that guides the cutter travel is not an ideal straight line but has a wavy shape, or even when the cutter travel is not an ideal straight line, the nonlinearity of the travel is reduced. This makes it possible to cancel, and makes it possible to make a cut line substantially perpendicular to the conveying direction on the surface of the plate glass.

  Then, a first cutting process is performed at the position of the cutting line, and a second cutting process is performed in a direction orthogonal to the first cutting direction (the direction of transporting the glass ribbon). The outer shape is dimensioned, and finally a good rectangular plate glass is processed and formed by a short cutting process.

  According to the first aspect of the present invention, the cutter traveling speed control pattern has a cutter speed corresponding to the elapsed time t in the cutter speed control pattern so as to absorb the undulation of the cutting line that may occur in the prior art. Positive correction or negative correction is performed. For this reason, even if the guide frame is not an ideal straight line but has a wavy shape, by using the corrected cutter traveling speed control pattern, the plate glass is not affected or hardly affected by the waviness. It is possible to make a cut line substantially perpendicular to the conveying direction on the surface of the sheet.

  As described above, according to the present invention, even if the guide frame has a wavy shape instead of an ideal straight line, it is not affected by the waviness or hardly received in the conveying direction on the surface of the plate glass. Accordingly, it is possible to provide a cutter traveling control method capable of making a substantially vertical cutting line.

System configuration diagram of a glass opener 10 using the cutter speed control pattern P ₂ by the correction method according to an embodiment of the present invention. Explanatory drawing of the manufacturing process of a general glass plate. Illustration of an example of a cutter speed control pattern P _{2 (Teihayaiki)} after correction. Explanatory drawing of the command position on the ideal straight line which divided n between the start point and the end points. Explanatory view showing an example of a cutter speed control pattern P _1. (A) conveying speed V _L of the glass sheet 30 is an explanatory view of what is controlled to be a constant speed, the conveyance speed V _L of (b) the glass sheet 30, it may vary due to disturbances such as a temperature change Explanatory drawing of that. (A) Explanatory drawing of the example of the cut line C when the guide frame 12 is an ideal straight line, (b) Explanatory drawing of the example of the cut line C when the guide frame 12 is wavy. An explanatory view of an example of wave of guide frame 12. FIG. Illustration of the principles of correcting the cutter speed control pattern P _1. Flow chart for explaining correction processing of the cutter speed control pattern P _1. Illustration of a correction process of the cutter speed control pattern P _1. The typical top view of the mother glass substrate cut out from the glass ribbon by the present invention. Explanatory drawing of the conventional glass cutter. Explanatory drawing of the conventional glass cutter.

  Hereinafter, a preferred embodiment of a cutter traveling speed control pattern correction method according to the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a system configuration diagram of the glass cutting machine 10, and FIG. 2 is an explanatory diagram of a general sheet glass cutting process. The present invention can be applied to plate glass for building materials and vehicles. The present invention is suitable for manufacturing a glass substrate for electronic devices that requires high dimensional accuracy and shape accuracy. In particular, it is preferable to apply in the production of a mother glass substrate for a flat panel display.

  The flat panel display can be applied to the production of a liquid crystal display (LCD), an organic electroluminescence device (organic EL device), a plasma display (PD), or a glass substrate for solar cells.

In particular, in the process of forming thin film transistors (TFTs) and color filters (CFs), manufacturing of FPD glass substrates where the outer shape and dimensions of the substrate itself, squareness at the four corners of the rectangle, finishing of the end faces, etc. are important technical elements. It is particularly preferable to apply to. The glass ribbon 12 is a schematic plan view showing the relationship between the tangential CL _W and vertical cut of along the flow direction of the glass substrate cut line CL _H of crossing.

  The present invention can dramatically improve the dimensional accuracy and the like of a glass substrate that requires high mechanical dimensional accuracy.

[Outline of Glass Cutting Machine 10]
As shown in FIG. 2, generally, a process of making a cutting line (also called a cutting line or a cutting line) on the surface of a glass ribbon manufactured to a predetermined thickness, and a bending moment is applied to the glass ribbon containing the cutting line. , A process of forming a glass plate by breaking along the cutting line, a chamfering process for chamfering the glass plate after split folding, a cleaning process for cleaning and drying the glass plate after chamfering, after cleaning Through an inspection process for inspecting the outer shape and the like of the glass plate, a glass plate as a final product that can be shipped is manufactured.

The glass cutting machine 10 of this embodiment is an apparatus for making a cut line on the surface of a plate glass manufactured to a predetermined thickness, and is installed in a cutting section 32 on a conveyance line as shown in FIG. The plate glass 30 (for example, thickness: 0.1-5 mm, or 0.1-0.7 mm, width: 1500-6000 mm) manufactured by predetermined thickness is conveyed on a conveyance line by the well-known conveyance means (for example, , Transport speed: 0.1 to 0.5 m / s), passing through the cutting section 32. The glass cutter 10 is configured so that the traveling speed V _{M of the} cutter 14 (for example, traveling speed: 0.2 to 2 m / s) according to the cutter traveling speed control pattern P ₂ (see FIG. 3) corrected by the correction method of the present embodiment. By controlling this, a cut line that is non-stop and substantially perpendicular to the conveying direction is made on the surface of the plate glass 30 that passes through the cutting section 32.

[Configuration of Glass Cutting Machine 10]
As shown in FIG. 1, the glass cutter 10 includes a guide frame 12, a cutter 14, a servo motor 16, a control device 18, a speed detector 20, and the like.

The guide frame 12 is a guide member for guiding the travel of the cutter 14 and is disposed in a posture inclined at an angle θ downstream in the transport direction with respect to a direction orthogonal to the transport direction of the plate glass 32 (transport speed: V _L ). Has been.

  The cutter 14 is a member that travels along the guide frame 12 and makes a cut line on the surface of the plate glass 32 that passes through the cutting section 32. For example, the cutter 14 is a cutter wheel that travels along the guide frame 12.

  The servo motor 16 is a known servo motor whose rotation is controlled in accordance with a position command input from the control device 18, for example, a pulse train of a predetermined frequency. The servo motor 16 is connected to the cutter 14 via a known drive mechanism (not shown), rotates in accordance with a position command from the control device 18, and the rotational motion is converted into a linear motion via the known drive mechanism. Convert and run the cutter 14.

  The servo motor 16 is preferably a linear servo motor. If the servo motor 16 is a linear servo motor, the cutter 14 can respond to a position command from the control device 18 at a high speed and can run with high accuracy.

The control device 18 includes calculation / control means such as an MPU and CPU, storage means such as RAM and ROM (none of which are shown), and the like. The control device 18 functions as a control means for controlling the cutter 14 by the calculation / control means executing a predetermined program read into the storage means. That is, the control device 18 determines that the cutter traveling speed control pattern P ₁ (see FIG. 5) or the book is so that the cutter 14 is positioned at the command position (see FIG. 4) on the ideal straight line obtained by dividing the start point and the end point by n. A position command is supplied to the servomotor 16 based on the cutter travel speed control pattern P ₂ (see FIG. 3) corrected by the correction method of the embodiment. The servo motor 16 that has received the position command from the control device 18 is rotationally controlled in accordance with the position command. As a result, the cutter 14 moves at the guide frame 12 at a speed according to the cutter travel speed control pattern P ₁ (see FIG. 5) or the cutter travel speed control pattern P ₂ (see FIG. 3) corrected by the correction method of the present embodiment. A cutting line that is substantially perpendicular to the conveying direction is made on the surface of the plate glass 30 that passes along the cutting section 32 and passes through the cutting section 32. In addition, when the plate glass 30 is a mother glass plate for a flat panel display, it is preferable that the site | part of the cutting | disconnection by a cut line is a position of the edge part of a mother glass substrate.

The conveyance speed _VL of the plate glass 30 is controlled to be a constant speed (see FIG. 6A), but may vary due to a disturbance such as a temperature change (see FIG. 6B). When the conveyance speed _VL of the plate glass 30 fluctuates, there is a problem that a cut line C including a swell component enters the surface of the plate glass 30 due to the fluctuation (see FIG. 7B).

In the present embodiment, even if the conveyance speed _VL of the plate glass 30 varies, in order to make a cut line that is substantially perpendicular to the conveyance direction on the surface of the plate glass 30 without being affected by or hardly affected by the variation. The speed detector 20 for detecting the conveyance speed _VL of the plate glass 30 is provided (see FIG. 1).

The control device 18 reads the conveyance speed V _L of the plate glass 30 passing through the cutting section 32 from the speed detector 20 at a predetermined timing. When there is a change in the read transport speed V _L , the control device 18 calculates a correction speed for absorbing the change every time, and the cutter 14 is operated by the cutter travel speed control pattern P ₁ (FIG. 5 is added to or subtracted from the calculated correction speed, the servo motor 16 is controlled so as to travel on the glass plate 30 while the speed is adjusted in real time.

Thereby, even if the conveyance speed _VL of the plate glass 30 passing through the cutting section 32 fluctuates, the surface of the plate glass 30 is substantially perpendicular to the conveyance direction without being affected or hardly affected by the variation. It becomes possible to make a cutting line.

[Cutter travel speed control pattern P ₁ ]
The cutter travel speed control pattern P ₁ (refer to FIG. 5, hereinafter also referred to as an operation pattern, a movement amount (command position) pattern) is formed on the surface of the plate glass 30 on the premise that the conveyance speed V _L of the plate glass 30 is constant. to enter a substantially vertical tangential to the conveying direction, the elapsed time t and _(hereinafter referred to as cutter velocity V _M) running speed V _M of the cutter 14 as that associated with (or elapsed time t and n divided ideal And a command position on a straight line (see FIG. 4).

Therefore, if the running at a speed V _M cutter 14 in accordance with the cutter speed control pattern P _{1 (see} FIG. 4), as long as the conveying speed V _L of the glass sheet 30 is constant with respect to the transporting direction on the surface of the glass sheet 30 Thus, a substantially vertical cutting line C should be entered (see FIG. 7A).

  However, as shown in FIG. 8, the guide frame 12 is not an ideal straight line due to various factors, but has a wavy shape. Therefore, when the cutter 14 travels along the guide frame 12, There is a problem that a cut line C containing a swell component enters the surface (see FIG. 7B). In FIGS. 7B and 8, the waviness is exaggerated for the sake of explanation.

In the present embodiment, the cutter travel speed control pattern P ₁ (in order to make a cut line substantially perpendicular to the conveying direction on the surface of the plate glass 30 without being influenced by the undulation of the guide frame 12 or hardly. (See FIG. 5) is corrected by the following method.

[Principle of correcting the cutter speed control pattern P _1]
As shown in FIG. 9, if the guide frame 12 is not an ideal straight line but has a wavy shape on the downstream side, the cutter 14 should reach the point A on the ideal straight line after the elapse of time t _A , As a result, a cutting line C containing a swell component enters the surface of the plate glass 30 (see FIG. 7B).

This is due to the undulation of the guide frame 12 (the undulation downstream of the ideal straight line), and the apparent traveling speed of the cutter 14 after the time t _{A has} elapsed is the time t in the cutter traveling speed control pattern P _1. This is because that is slower than the cutter velocity V _M corresponding to the _a.

Therefore the traveling speed of the apparent cutter 14 absorbs waviness due to fluctuations, so as to reach the time t _A after the lapse cutter 14 point A '', passed in the cutter speed control pattern P ₁ the cutter speed _{V M} corresponding to the time _{t a} plus correction (see FIG. 3).

Similarly, as shown in FIG. 9, if the guide frame 12 is not an ideal straight line but has a shape wavy upstream, the cutter 14 should reach the point C on the ideal straight line after the elapse of time t _C. A point C ′ on the actual travel line is reached, and as a result, a cut line C including a swell component enters the surface of the plate glass 30 (see FIG. 7B).

This is because the apparent traveling speed of the cutter 14 after the elapse of time t _C is the time t in the cutter traveling speed control pattern P ₁ due to the undulation of the guide frame 12 (swelling upstream of the ideal straight line). because that is faster than the cutter velocity V _M corresponding to the _C.

Therefore the traveling speed of the apparent cutter 14 absorbs waviness due to fluctuations, so as to reach the time t _C cutter 14 point after the elapse C '', passed in the cutter speed control pattern P ₁ the cutter speed _{V M} corresponding to the time _{t C} minus correction (see FIG. 3).

By using the so time t _A, the cutter speed V _M plus or minus corrected cutter speed control pattern P ₂ corresponding to t _{C (see} FIG. 3) or more, the cutter 14 based on the guide frame 12 which undulates Therefore, it is possible to make a cut line substantially perpendicular to the conveying direction on the surface of the plate glass 30 without being affected by or hardly affected by the undulation of the guide frame 12.

[Correction process of cutter speed control pattern P _1]
Figure 10 is a flowchart illustrating a specific process for correcting the cutter speed control pattern P _1. The following processing is realized by the control device 18 executing a predetermined program read into the storage means.

  First, the undulation C1 (actual glass cutting line, with regularity) of the guide frame 12 shown in FIG. 11 is measured (step S1). As a measuring method, in addition to a method of directly measuring the undulation C1 of the guide frame 12, a method of measuring indirectly may be considered.

  As an indirect measurement method, for example, position detection sensors are arranged on both sides of the conveyance line, and the position detection sensors are used to pass through the cutting edge of the glass plate that is split along the cutting line inserted by the glass cutting machine 10. A method is conceivable in which the amount of variation in position is measured and calculated based on the measurement result.

  Alternatively, the image pickup device is moved with respect to the cut edge of the glass plate that is split along the cut line that is previously inserted by the glass cutting machine 10 (or the image pickup device is split along the cut line that is inserted by the glass cutting machine 10. A method of imaging the entire cutting edge (by moving the cutting edge of the glass plate) and calculating the swell C1 of the guide frame 12 based on the captured image is also conceivable. In this case, for example, an image including a reference straight line (such as a piano wire stretched on a straight line) is taken together with the cutting edge, and the distance from the reference straight line to the cutting edge is calculated by predetermined image processing to be measured more accurately. Is possible.

  Next, a corrected cutting line C2 (see FIG. 11) obtained by inverting the undulation C1 measured in step S1 is calculated (step S2).

  Next, a curve C3 (see FIG. 11) in which the corrected cutting line C2 calculated in step S2 is shifted downstream by COSθ is calculated (step S3).

Then, the point A- calculates the operation pattern through the point A 'the point A than the frame design value from difference of''is plotted to pass advance point on the cutter speed control pattern P ₁ A''' (FIG. 11, see FIG. Thereby, a movement amount (command position) pattern is calculated (step S4).

By executing the process of step S4 not only for the point A but also for the points B and C, it is possible to generate a corrected cutter speed control pattern P ₂ (see FIG. 3).

Controller 18 on the basis of the corrected cutter speed control pattern P _2, and supplies the position command to the servo motor 16 (step S5). The servo motor 16 that has received the position command from the control device 18 is rotationally controlled in accordance with the position command. Thus, the cutter 14 is substantially perpendicular to corrected cutter travels at the speed control pattern speed in accordance with P ₂ travels along a guide frame 12, the conveying direction on the surface of the glass sheet 30 passing through the cutting section 32 Insert a cutting line.

As described above, by using the corrected cutter traveling speed control pattern P ₂ (see FIG. 3), the non-linearity of the cutter 14 based on the wavy guide frame 12 is offset. A cut line that is substantially perpendicular to the conveying direction can be made on the surface of the plate glass 30 without being influenced or almost unaffected.

  The plate glass 30 with the cut line is broken along the cut line by the action of the bending moment, the cleaved glass plate is chamfered, and the chamfered glass plate is washed and dried. The glass plate after the cleaning is inspected for its outer shape and the like, and a glass plate as a final product that can be shipped is manufactured.

  As described above, it is possible to make a cut line substantially perpendicular to the conveying direction on the surface of the plate glass 30 with little or no influence of the undulation of the guide frame 12, so that the chamfering that is the next step is performed. It is possible to reduce the chamfering burden in the process. And the glass substrate excellent in an external dimension and an external shape can be manufactured by cut | disconnecting the plate glass 30 in the position of these cutting lines.

Incidentally, the glass sheet 30 when it is the mother glass plate for a flat panel display, as shown in FIG. 12, the first cut based on tangential CL _W of crossing, vertical switching of extending in a direction substantially perpendicular performing a second cutting process to put the cut line CL _H, preferably formed of sheet glass 30 in a rectangular shape of the mother glass substrate. In this case, it is preferable to chamfer the end surfaces of the first cut and the second cut. The size of the mother glass substrate can be determined by the above chamfering process.

As described above, according to the present embodiment, even when the guide frame 12 that guides the travel of the cutter 14 has a wavy shape instead of an ideal straight line, or when the travel of the cutter 14 does not become an ideal straight line. Even if it exists, it becomes possible to cancel the non-linearity of the traveling, and it becomes possible to make a cut line substantially perpendicular to the conveying direction on the surface of the plate glass 30. Then, the first cutting process is performed at the position of the cutting line (for example, the horizontal cutting line CL _W shown in FIG. 12), and further, the direction perpendicular to the first cutting direction (the conveying direction of the glass ribbon. For example, FIG. 12). The second cutting process is performed at the vertical cutting line CL _H ) shown in FIG. 2 to chamfer the end and dimension the outer shape, and finally form a good rectangular plate glass by a short cutting process. It becomes possible.

In addition, according to the present embodiment, the cutter traveling speed control pattern P ₁ has a cutter speed corresponding to the elapsed time t in the cutter speed control pattern P ₁ so as to absorb the undulation of the cutting line that may occur in the prior art. Positive correction or negative correction is performed. Thus, if not the guide frame 12 is ideally a straight line, even which was a shape wavy, by using the corrected cutter speed control pattern P _2, non-linearity of the cutter 14 based on the guide frame 12 which undulates Therefore, it becomes possible to make a cut line substantially perpendicular to the conveying direction on the surface of the glass sheet 30 without being influenced by the undulation or with little influence.

  Next, a modified example will be described.

  In the said embodiment, although the object which puts a cut line demonstrated the example which is plate glass, this invention is not limited to this. For example, the present invention can be similarly applied to cutting processing of a plate-shaped article such as a wooden plate, a metal plate, and a resin plate.

  The above embodiment is merely an example in all respects. The present invention is not construed as being limited to these descriptions. The present invention can be implemented in various other forms without departing from the spirit or main features thereof.

  DESCRIPTION OF SYMBOLS 10 ... Glass cutting machine, 12 ... Guide frame, 14 ... Cutter, 16 ... Servo motor, 18 ... Control apparatus, 20 ... Speed detector, 30 ... Sheet glass, 32 ... Cutting section

Claims (12)

A control device that controls the traveling speed of the cutter based on a cutter that travels along the guide frame and cuts the sheet glass that is conveyed in a certain direction, and a cutter traveling speed control pattern that associates the elapsed time with the cutter speed. And a traveling control method for a cutter used in a glass cutting machine comprising:
When the apparent traveling speed of the cutter after time t is slower than the cutter speed corresponding to the elapsed time t in the cutter speed control pattern, the cutter speed control pattern is absorbed so as to absorb the undulation of the cutting line. A step of positively correcting the cutter speed corresponding to the intermediate elapsed time t;
When the apparent traveling speed of the cutter after time t is faster than the cutter speed corresponding to the elapsed time t in the cutter speed control pattern, the cutter speed control pattern is absorbed so as to absorb the swell of the cutting line. A step of negatively correcting the cutter speed corresponding to the intermediate elapsed time t;
A cutter travel control method comprising:   2. The cutter travel control method according to claim 1, wherein the thickness of the plate glass is 0.1 to 5 mm.   2. The cutter travel control method according to claim 1, wherein the thickness of the plate glass is 0.1 to 0.7 mm.   4. The cutter travel control method according to claim 1, wherein the conveyance speed is 0.1 to 0.5 m / s.   The cutter travel control method according to claim 1, 2, 3, or 4, wherein the width of the plate glass is 1500 mm to 6000 mm.   6. The cutter traveling control method according to claim 1, wherein the cutter traveling speed is 0.2 to 2 m / s.   The cutter travel control method according to claim 1, wherein the cutter is caused to travel by a linear servo motor.   The cutting method of the plate glass which cut | disconnects plate glass in the position of the said cut line in the traveling control method of the cutter of any one of Claims 1-7.   The plate glass cutting method according to claim 8, wherein the plate glass is a mother glass substrate for a flat panel display, and a portion to be cut by the cutting line is a position of an end portion of the mother glass substrate.   The cutting method of the plate glass of Claim 9 which performs the 2nd cutting process in the direction substantially orthogonal with respect to the 1st cutting | disconnection based on the said cut line, and forms plate glass in a rectangular-shaped mother glass substrate.   The cutting method of the plate glass of Claim 8, 9 or 10 which chamfers about the end surface of the 1st cutting | disconnection and 2nd cutting | disconnection of plate glass.   The plate glass cutting method according to claim 11, wherein the size of the mother glass substrate is determined by chamfering.

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