KR20150061601A - Cutting device of glass sheet, cutting method of glass sheet and producing method of glass sheet - Google Patents

Abstract

According to the present invention, an outline part on a front end portion of a glass plate is prevented from colliding with a pressing means immediately after the glass plate is cut. A cutting apparatus (10) of the present invention pushes up a lower side under a cutting line (14) of the glass plate (12) in the shape of a strip by upward movement of a cutting roller (16). The glass plate (12) in the shape of a strip is cut along the cutting line (14) when the cutting roller (16) moves up to an elevation location. When the glass plate (12) in the shape of a strip is cut, a pressing roller (28) comes in contact with an upper side of the glass plate (12) in the shape of strip and pushes a lower side of the glass plate (12) to a roller (22) of a roller conveyer (24). Therefore, the glass plate (12) is exactly cut along the cutting line (14). Afterward, the pressing roller (28) moves away from an upper side of the glass plate (12) when pushing-up operation of the cutting roller (16) is finished. Accordingly, the outline part (12A) on the front end portion of the glass plate does not collide with the pushing roller (26) and is returned by the roller.

Description

TECHNICAL FIELD [0001] The present invention relates to a glass sheet cutting apparatus, a glass sheet cutting method, and a glass sheet manufacturing method,

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

Patent Documents 1 and 2 disclose a method in which a strip-shaped glass plate (also referred to as a glass ribbon) in which a cutting line (also referred to as a line or scribe line) is formed on the upper surface thereof is transported in a horizontal direction by a roller conveyor, A glass plate cutting apparatus for cutting a glass plate.

In the cutting apparatus of Patent Document 1, a push-up roll (hereinafter referred to as a cutting roller) is provided as a cutting means, and a cutting device of Patent Document 2 is provided with a roughly triangular- Quot;). These cutting rollers are raised or rotated with respect to the lower surface of the band-shaped glass plate, and the band-shaped glass plate is pushed upward against the conveying surface. Thereby, a bending moment is generated at the cut line, and the band-shaped glass plate is cut along the cut line.

Further, in the cutting apparatuses of Patent Documents 1 and 2, a press roll (pressurizing means) is disposed on the upstream side and the downstream side in the conveying direction of the band-shaped glass sheet with the cutting roller interposed therebetween. These pressing rolls are in contact with the upper surface of the strip-shaped glass plate. Therefore, the bending moment in the opposite direction can be applied to both sides of the cut line by the cutting operation of the cutting roller and the pressing action of the press roll, so that the band-shaped glass plate is reliably cut along the cut line.

The cutting apparatus and the cutting line processing apparatus are disposed adjacent to a glass plate manufacturing apparatus by a float method or the like. In other words, the cutting line is processed by the cutter of the cutting line processing apparatus while the band-shaped glass plate which is continuously produced by the glass plate producing apparatus is conveyed in this state. The machining direction of the cut line is a direction orthogonal to the conveying direction of the band-shaped glass plate. After the cutting line is processed, the band-shaped glass plate is cut by the above-mentioned cutting apparatus. Thereby, a rectangular glass plate having a predetermined size can be obtained from the band-shaped glass plate.

As the glass plate manufactured by the above-described glass plate manufacturing apparatus, a glass plate having a thickness of several millimeters or more for use in a building, an automobile or the like and a glass plate having a thickness of 0.7 mm or less used for FPD (Flat Panel Display) Is known. It is also known that as the thickness of the band-shaped glass sheet to be produced becomes thinner, the production speed of the band-shaped glass sheet becomes faster and the conveying speed of the belt-shaped glass sheet becomes faster.

Japanese Patent Publication No. 48-22811 Japanese Patent No. 2596054

However, in the conventional apparatus for cutting a glass sheet, there is a problem that the front edge of the strip-shaped glass sheet immediately after cutting collides with the pressing roll disposed on the downstream side of the cutting roller. This problem becomes more frequent as the thickness of the band-shaped glass plate becomes thinner, and the band-shaped glass plate having a thickness of 0.5 mm or less remarkably occurs. That is, the band-shaped glass sheet having a thickness of 0.5 mm or less is easy to bend and the conveying speed is also fast.

The problem of the collision may be that the downstream press roll is separated from the cutting roller in the downstream direction by a distance that avoids the collision. However, since the strip-shaped glass plate has a property of being warped as it becomes thinner, when the downstream-side pushing roll is excessively spaced from the cutting roller, most of the cutting operation of the cutting roller acts as a force for bending the strip- do. Therefore, an effective bending moment can not be applied to the cutting line.

That is, in order to smoothly cut the strip-shaped glass sheet having a thickness of 0.5 mm or less along the cutting line, it is necessary to arrange the downstream-side pressing rolls close to the cutting roller. In this case, Lt; / RTI >

Further, since the leading edge portion of the strip-shaped glass sheet having a thickness of 0.5 mm or less is liable to be bent by its own weight, the leading edge portion may collide with the roller during conveyance by the roller conveyor,

SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a glass sheet cutting apparatus in which a pressing means disposed on the downstream side of a cutting means is disposed close to a cutting means, A method of cutting a glass plate, and a method of manufacturing a glass plate.

According to one aspect of the present invention, in order to achieve the above-described object, there is provided a conveyor apparatus comprising: a roller conveyor for horizontally conveying a glass plate on which a cutting line has been machined from an upstream side to a downstream side; A pressing means for pressing the lower surface of the glass plate against the upper surface of the glass plate and pressing the lower surface of the glass plate against the roller conveyor; A driving means for retracting the pressing means against the upper surface of the glass plate and a control means for controlling the driving means so as to retract the pressing means from the upper surface of the glass plate at the end of the raising operation of the cutting means, Further, after the leading edge portion of the glass plate passes under the pressing means, To return back to the original position in contact with the upper surface of the plate provides an apparatus for cutting a glass sheet, it characterized in that it comprises control means for controlling said drive means.

In order to achieve the above-mentioned object, one aspect of the present invention provides a method for manufacturing a glass plate, comprising the steps of: transporting a glass plate with a cutting line processed by a roller conveyor in a horizontal direction from an upstream side to a downstream side; A cutting step of cutting the glass plate along the cutting line by pushing the lower face of the glass plate upward by the cutting means and a pressing step of pressing the pressing means disposed on the downstream side of the cutting means against the upper face of the glass plate, The pressing means is retracted from the upper surface of the glass plate at the end of the pushing up operation of the cutting means and the leading edge of the glass plate is moved downward After returning to the original position where the pressing means is in contact with the upper surface of the glass plate Which provides a method of cutting a glass sheet, it characterized in that it comprises a pressing means movement controlling step.

According to one aspect of the present invention, the glass plate is conveyed by the roller conveyor in the conveying step, and the lower surface of the cutting line processed on the glass plate in the cutting step is pushed up by the cutting means, and the glass plate is cut along the cutting line. At the time of cutting, the pressing means contacts the upper surface of the glass plate in the pressing step and presses the lower surface of the glass plate onto the roller conveyor, so that the glass plate is reliably cut along the cutting line. Then, in the pressurizing means movement control step, the pressurizing means is controlled by the control means as follows. That is, the pressing means is retracted from the upper surface of the glass plate by the driving means controlled by the control means at the end of the lifting operation of the cutting means (including immediately before and after the end of the lifting operation). The position at which the pressurizing means is retracted and moved is preferably above the glass plate, but may be located on the side of the glass plate. This makes it possible to prevent the leading edge portion of the glass sheet immediately after being cut from colliding with the pressing means even when the pressing means disposed on the downstream side of the cutting means is disposed close to the cutting means. The pressing means is moved back to the original position where the top edge portion of the glass plate contacts the upper surface of the glass plate by the driving means controlled by the control means after passing through the lower portion of the pressing means. Thereby, the glass plate can be cut along the next cutting line.

In one aspect of the present invention, K is the height of the contact point when the leading edge portion of the glass sheet being conveyed by the roller conveyor contacts the roller of the roller conveyor, and K is the height from the vertex of the roller, Is set to R, and the size of the gap between the rollers of the roller conveyor is G, it is preferable that G is set to satisfy K < R.

According to one aspect of the present invention, even when the leading edge portion of the glass sheet is bent downward by its own weight during conveyance by the roller conveyor, and the leading edge portion collides against the surface of the roller, the leading edge portion is prevented from being curled downward .

In one embodiment of the present invention, the thickness of the glass plate is preferably 0.5 mm or less.

In one embodiment of the present invention, the thickness of the glass plate is preferably 0.05 mm or more.

In the case of a cutting apparatus in which a glass plate is continuously fed from a glass plate producing apparatus using a manufacturing method such as a float method or a down-draw method and the glass plate is cut, the glass plate is liable to be bent as the thickness of the glass plate becomes thin, It accelerates. Therefore, one type of cutting apparatus of the present invention can be effectively applied to a glass plate having a thickness of 0.5 mm or less.

In one aspect of the present invention, it is preferable that the pressing means is in contact with the upper edge of the glass plate.

According to one aspect of the present invention, since the pressing means does not contact the product surface of the glass plate, the product surface can be protected from the pressing means.

In one embodiment of the present invention, it is preferable that the cutting means is an elevating member which moves up and down with respect to the lower surface of the glass plate.

According to one aspect of the present invention, the cutting means is an elevating member, which is raised relative to the lower surface of the glass plate, and pushes up the glass plate to cut the glass plate along the cutting line. In this case, it is possible to perform cutting with high accuracy by raising and lowering the elevating member by the servo motor.

According to an aspect of the present invention, it is preferable that the cutting means is a rotating roller, and the surface of the rotating roller is provided with a projection for pushing the lower surface of the glass plate upward.

According to one aspect of the present invention, the lower surface of the cutting line below the glass sheet is pushed up by the projections of the rotating roller, and the glass sheet is cut along the cutting line. In this case, it is possible to perform cutting with high precision by driving the rotating roller by the servo motor.

One aspect of the present invention provides a method of manufacturing a glass plate, which comprises a method of cutting a glass plate according to an aspect of the present invention to achieve the above object.

As described above, according to the glass sheet cutting apparatus, the glass sheet cutting method, and the glass sheet manufacturing method of the present invention, even when the glass sheet cutting apparatus in which the pressing means disposed on the downstream side of the cutting means is disposed close to the cutting means, It is possible to prevent the leading edge of the glass sheet immediately after being cut from colliding with the pressing means.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a top view of a cutting apparatus for a glass plate according to an embodiment. Fig.
2 is a side view of the cutting device of the glass plate shown in Fig.
3 (A) to 3 (E) are explanatory diagrams showing the ascending and descending operations of the cutting roller and the pressure roller of the cutting apparatus in a time-wise manner.
4 is an enlarged side view of a main part for explaining an appropriate clearance between the rollers;
5 (A) and 5 (B) are plan views showing suitable contact positions of the pressure roller against the belt-shaped glass plate.
6 (A) to 6 (E) are explanatory diagrams showing the ascending and descending operations of the cutting rotary roller and the pressurizing roller of the cutting apparatus in a time-wise manner.

Best Mode for Carrying Out the Invention Hereinafter, preferred embodiments of a glass sheet cutting apparatus, a glass sheet cutting method, and a glass sheet manufacturing method according to the present invention will be described with reference to the accompanying drawings.

Fig. 1 is a top view of a cutting apparatus 10 of a glass sheet according to the embodiment, and Fig. 2 is a side view of the cutting apparatus 10 of the glass sheet shown in Fig. In these drawings, the conveying direction of the strip-shaped glass plate (glass plate) 12 to be cut is indicated by an arrow A.

[Glass plate to be cut]

As the glass plate to be cut, a preferable example of the band-shaped glass plate 12 having a thickness of 0.5 mm or less is exemplified, but the thickness of the band-shaped glass plate 12 is not limited thereto. However, in the case of cutting a strip-shaped glass plate 12 which is easy to bend and which has a high conveying speed in the manufacturing process, preferably 0.5 mm or less in thickness and more preferably 0.3 mm or less in thickness, 10) is particularly effective. The strip-shaped glass plate 12 having such a small thickness is used as a glass plate for FPD which requires high dimensional accuracy and shape accuracy. The lower limit of the thickness of the glass plate is not particularly limited, but its thickness is preferably 0.05 mm or more.

[Configuration of Cutting Apparatus 10]

As shown in Fig. 2, the cutting apparatus 10 is provided with a cylindrical cutting roller (cutting means: elevating member) for cutting a strip-shaped glass plate 12 having a cutting line 14 formed on its upper surface along a cutting line 14, ) 16 are provided. On the upstream side of the strip-shaped glass plate 12 of the cutting roller 16 in the conveying direction, a roller conveyor 20 including a plurality of cylindrical rollers 18 is provided. The strip-shaped glass plate 12 is conveyed in the horizontal direction by the roller conveyor 20 and in the conveying direction indicated by the arrow A as well. A roller conveyor 24 including a plurality of cylindrical rollers 22 is provided on the downstream side of the cutting roller 16 in the conveying direction.

The rollers 18 and 22 are provided so that the upper surface level is the same height, but they may be provided so as to be higher toward the downstream side. Although the diameter of the cutting roller 16 is larger than the diameter of the rollers 18 and 22, the diameter of the cutting roller 16 may be smaller than the diameter of the rollers 18 and 22.

A pressing roller 26 is disposed on the upstream side of the cutting roller 16 in the carrying direction and a pressing roller 26 is provided on the downstream side in the carrying direction to easily cut the strip- 28 are disposed. The pressure rollers 26 and 28 are rollers of the same shape and are disposed at symmetrical positions with respect to the cutting roller 16. [

The pressing roller 26 is brought into contact with the upper surface of the strip-shaped glass plate 12 so that the lower surface of the strip-shaped glass plate 12 is pressed against the roller 18 of the roller conveyor 20. The pressing roller 28 is brought into contact with the upper surface of the strip-shaped glass plate 12 immediately before cutting and the lower surface of the strip-shaped glass plate 12 is pressed against the roller 22 of the roller conveyor 24. The pressing roller 28 is also brought into contact with the upper surface of the rectangular glass plate 30 immediately after cutting so that the rectangular glass plate 30 is pressed against the roller 22 of the roller conveyor 24. [

In Fig. 1, the roller conveyors 20 and 24 are omitted in order to clearly illustrate the disposing position of the cutting roller 16. As shown in Fig. 1, the pressure rollers 26 and 28 are arranged in a direction orthogonal to the conveying direction of the strip-shaped glass plate 12, and the width of the strip-shaped glass plate 12 and the width of the rectangular- And is made up of a length in contact with the whole area. The materials of the pressure rollers 26, 28 and the cutting roller 16 are not particularly limited, but materials of a band-like glass plate 12 and a rectangular glass plate 30 that do not cause scratches are used. The processing direction of the cutting line 14 processed on the upper surface of the strip-shaped glass plate 12 is a direction perpendicular to the carrying direction.

2, the peripheral speed of the roller 22 of the roller conveyor 24 is set at a speed around the roller 18 of the roller conveyor 20 when the rectangular glass plate 30 is separated from the belt- Is increased by a predetermined time. As a result, the plurality of continuously separated rectangular glass plates 30 are conveyed toward the downstream-side plate collecting section (not shown) of the roller conveyor 24 in a state in which a predetermined gap is opened. Thus, breakage due to contact with the adjacent rectangular glass plate 30 is prevented.

<Regarding Up and Down Control of Cutting Roller 16 and Pressure Roller 28>

The cutting device 10 is provided with a driving unit (driving means) (not shown) for moving the servomotor 32 and the pressing roller 28 for moving the cutting roller 16 up and down with respect to the upper surface of the belt- 34 are provided. The cutting apparatus 10 is also provided with a controller (controller) 36 for controlling the servo motor 32 and the drive unit 34.

The drive unit 34 includes an electromagnetic valve and a speed controller and controls the supply and stop of the fluid (air) by the electromagnetic valve by the control unit 36 so that the drive mechanism 40 Is controlled to be ON / OFF. Further, the flow rate of the fluid by the speed controller is controlled by the control unit 36, so that the lifting speed of the driving mechanism 40 is controlled. A servo motor may be used as the driving unit 34. [

The servo motor 32 and the driving unit 34 are driven in accordance with an operation command (for example, a pulse train of a predetermined frequency) output from the control unit 36. [ The servo motor 32 is connected to the cutting roller 16 through a known drive mechanism 38 such as a ball screw device and is rotated according to an operation command from the control unit 36, (38). Thereby, the cutting roller 16 is moved up and down. The normal position of the cutting roller 16 is set to a position where the top surface level of the cutting roller 16 is at the same level as the top surface level of the roller 18, as shown by the two-dot chain line in Fig. The cutting roller 16 is raised from the normal position to the raised position shown by the solid line in Fig. 2, whereby the lower surface of the band-shaped glass plate 12 is pushed upward. The cutting roller 16 is immediately moved down from the raised position and returned to the normal position in accordance with the operation command output from the control unit 36. [

The driving unit 34 is likewise connected to the pressure roller 28 through a known driving mechanism 40 and is driven in accordance with an operation command from the control unit 36. As a result, do. The normal position of the pressure roller 28 is set at a position in contact with the upper surface of the band-shaped glass plate 12 as shown by the solid line in Fig. The pressure roller 28 is raised from the normal position to the raised position shown by the two-dot chain line in Fig. 2, thereby being retreated upward relative to the upper surface of the band-shaped glass plate 12. Further, the pressure roller 28 is immediately moved down from the raised position and returned to the normal position in accordance with the operation command output from the control unit 36. [

An operation command for starting the rising of the cutting roller 16 outputted from the control unit 36 to the servo motor 32 and an operation command for starting the rising of the pressing roller 28 are transmitted to the cutting roller 16 and the cutting line 14, Shaped glass plate 12 while being in contact with the belt-shaped glass plate 12, for example, based on an output signal from a known measuring device 42 for measuring the conveying amount of the belt-shaped glass plate 12. [ In addition, the operation command for starting the elevation of the pressure roller 28 is output at the end of the push-up operation of the cutting roller 16 (including immediately before and after the end of the pushing-down operation). Thus, the belt-shaped glass plate 12 is reliably cut along the cutting line 14 by the upward movement of the cutting roller 16 and the pressing action of the pressure roller 28. [

In addition, as the operation control method of the start of the pressure roller 28, the drive unit 34 may be time-controlled so as to start to rise after a predetermined time delay at the start of the rising of the cutting roller 16. [ It is also possible to use a drive means such as an air cylinder instead of the servo motor 32. The use of the servo motor 32 can control the start-up operation in detail, Lt; / RTI &gt;

[Operation of Cutting Apparatus 10]

3 (A) to 3 (E) are explanatory diagrams showing the ascending and descending operations of the cutting roller 16 and the ascending and descending operations of the pressing roller 28 in a time-wise manner. 3 shows the rotating direction of the roller 18, the arrow C shows the rotating direction of the pressing roller 26, the arrow D shows the rotating direction of the cutting roller 16, and the arrow E The direction of rotation of the roller 22, and the arrow F represents the direction of rotation of the pressure roller 28. [ The arrow G indicates the direction of movement of the cutting roller 16, and the arrow H indicates the direction of movement of the pressing roller 28.

As shown in Fig. 3A, when the strip-shaped glass plate 12 is conveyed (conveyed) by the roller conveyor 20 and the cutting line 14 approaches the upper side of the cutting roller 16 The servomotor 32 (see Figs. 1 and 2) is driven based on the operation signal from the control unit 36, and the upward movement of the cutting roller 16 is started as indicated by the arrow G.

3 (B), the lower side of the cutting line 14 of the band-shaped glass plate 12 is pushed up by the upward movement of the cutting roller 16 as indicated by an arrow G Goes.

As shown in Fig. 3 (C), when the cutting roller 16 is raised to the raised position, the strip-shaped glass plate 12 is cut along the cutting line 14 (cutting step).

3 (A) to 3 (C), the pressure roller 28 is positioned at a normal position and contacts the upper surface of the strip-shaped glass plate 12, The lower surface of the roller 12 is pressed against the roller 22 of the roller conveyor 24 (pressing step). As a result, the strip-shaped glass plate 12 is reliably cut along the cutting line 14 as shown in Fig. 3 (C).

Thereafter, the operation of the pressure roller 28 is controlled as follows by the control unit 36 (pressing means movement control step).

First, the pressurizing roller 28 is controlled by the control unit 36 at the end (including immediately before and immediately after the end of the push-up operation of the cutting roller 16 shown in Fig. 3C) Is moved backward from the upper surface of the band-shaped glass plate 12 as shown by the arrow H by the driving unit 34 to the raised position shown in FIG. 3 (D).

3 (D), the leading edge 12A of the strip-shaped glass plate 12 does not collide with the pressure roller 26 but falls down toward the roller 22 by its own weight.

Thus, according to the cutting apparatus 10 of the embodiment, even when the pressure roller 28 is disposed close to the cutting roller 16, the leading edge portion 12A of the band-shaped glass sheet 12 immediately after cutting is pressed It is possible to prevent the roller 28 from colliding with the roller 28.

The pressing roller 28 is rotated by the driving unit 34 controlled by the control unit 36 after the leading edge 12A of the band-shaped glass plate 12 passes under the pressure roller 28, As shown in FIG. 3 (E), to the original normal position in contact with the upper surface of the strip-shaped glass plate 12. As a result, the strip-shaped glass plate 12 can be cut along the next cutting line 14.

3 (D), the pressure roller 28 is preferably located above the belt-shaped glass plate 12, but may be located on the side of the belt-shaped glass plate 12. Further, the cutting roller 16 is moved downward in the direction of arrow G from the upper position shown in Fig. 3 (C), and returns to the normal position shown in Fig. 3 (E).

<Regarding the size setting of the gap between the rollers 18 and 22>

The strip-shaped glass plate 12 having a thickness of 0.5 mm or less (more preferably 0.3 mm or less) is easily deformed by its own weight at the leading edge portion 12A. Therefore, during conveyance by the roller conveyors 20 and 24, The rim portion 12A may collide with the surfaces of the rollers 18 and 22 and may be curled downwardly of the rollers 18 and 22. [

The size of the gap between the rollers 18 and 22 for preventing the above problem is set.

Fig. 4 is an enlarged side view of a main portion for explaining the size of a suitable gap between the rollers 18 and 22. Fig.

4 shows that the leading edge portions 12A and 30A of the strip-shaped glass sheet 12 (including the rectangular glass sheet 30) being conveyed by the roller conveyors 20 and 24 are conveyed to the roller conveyor 20, The height of the contact point when the rollers 18 and 22 contact the rollers 18 and 22 of the rollers 18 and 22 from the vertex P of the rollers 18 and 22 is K and the radius of the rollers 18 and 22 is R And the size (shortest distance) of the gap between the rollers 18 and 22 is G, it is preferable to set G to satisfy K < R.

By setting G as described above, the leading edge portions 12A and 30A of the strip-shaped glass plates 12 and 30 are bent downward by their own weight during conveyance by the roller conveyors 20 and 24, It is possible to prevent the leading edge portions 12A and 30A from being curled downwardly of the rollers 18 and 22 even when the rollers 18 and 22 collide against the surfaces of the rollers 18 and 22. [

The G satisfying K < R is also adapted to the gap between the roller 18 and the cutting roller 16 and the gap between the cutting roller 16 and the roller 22 in Fig. 3, the cutting roller 16 is always in contact with the lower surface of the strip-shaped glass plate 12. However, the cutting roller 16 is not in contact with the lower surface of the strip-shaped glass plate 12 except at the time of cutting, Or may be retracted below the glass plate 12. In this configuration, G between the roller 18 and the roller 22 is set to a value that satisfies K < R. Also in the form of FIG. 6 to be described later, G is similarly set.

<Regarding Thickness of the Band-Like Glass Plate 12>

As described above, the thickness of the glass plate to be cut by the cutting apparatus 10 of the embodiment is preferably 0.5 mm or less, more preferably 0.3 mm or less. The thickness is preferably 0.05 mm or more.

In the case of a cutting apparatus in which a strip-shaped glass plate is continuously fed from a glass plate producing apparatus using a production method such as a float method or a down-draw method, and as the thickness of the strip-shaped glass plate becomes thinner, And the conveying speed is also increased. Therefore, the cutting apparatus 10 of the embodiment can be effectively applied to the strip-shaped glass plate 12 having a thickness of 0.5 mm or less. Further, the cutting apparatus 10 of the embodiment can be effectively applied even if it is a band-shaped glass plate 12 having a thickness of 0.3 mm or less.

&Lt; Other Embodiments of Pressure Roller >

5 (A) and 5 (B) are plan views showing suitable contact positions of the pressure roller against the belt-shaped glass plate.

Fig. 5A shows a strip-shaped glass plate 12 having a pre-cut ear portion, and Fig. 5B shows a strip-shaped glass plate 13 having an ear portion 13A. 5A and 5B is the product glass plate 15, which is the inner area of the dashed double-dotted line L (the center face serving as the product face of the upper face of the glass plate). The ear portion 13A is a glass plate formed along the conveying direction on both edge portions of the band-shaped glass plate 13 at the time of manufacturing the band-shaped glass plate 13, and is a glass plate thicker than the product glass plate 15. [

5 (A), the pressing roller 28A is in contact with the glass plate 17 in the outer region of the product glass plate 15 except for the product glass plate 15, and in FIG. 5 (B) Is brought into contact with the ear portion 13A.

By contacting the pressure rollers 28A and 28B on the outside of the product glass plate 15 in this manner, the quality area of the upper surface of the product glass plate 15 can be protected from the pressure rollers 28A and 28B. The same applies to the pressure roller 26. [ The quality region is a region requiring strict quality as a glass plate for an FPD. By bringing the pressure rollers 28A and 28B into contact with the outside of the quality area, it is possible to prevent surface defects in the quality area caused by the contact of the pressure rollers 28A and 28B.

<Other Modes of Cutting Means>

6 (A) to 6 (E), cutting rotating rollers (rotating rollers) 44 as other cutting means are shown. 6 (A) to 6 (E), the lifting operation of the cutting rotary roller 44 and the pressure roller 28 is shown in a time-series manner. The direction indicated by the other arrows A, B, C, E, F and H indicates the direction of rotation of the cutting rotary roller 44 as indicated by the arrows A, B, C, E, F, H &lt; / RTI &gt;

A first projection 46 for pushing up the lower surface of the strip-shaped glass plate 12 upward and a second projection 46 for pushing the lower surface of the band-shaped glass plate 12 upward in the rotational direction are provided on the surface (circumferential surface) And a second projection 48 disposed adjacent to the first projection 46 is provided.

As shown in Fig. 6 (A), when the strip-shaped glass plate 12 is conveyed by the roller conveyor 20 and the cutting line 14 approaches the upper side of the cutting rotary roller 44, The rotation of the rotating roller 44 for use is started as indicated by the arrow J.

6 (B), the lower surface of the cutting line 14 of the strip-shaped glass plate 12 is rotated by the rotation of the cutting rotary roller 44 by the arrow J, (46).

6 (C), the strip-shaped glass plate 12 is cut along the cutting line 14 at the position where the first projection 46 faces upward.

6 (A) to 6 (C), the pressure roller 28 is positioned at the normal position and contacts the upper surface of the strip-shaped glass plate 12, (12) is pressed against the roller (22) of the roller conveyor (24). As a result, the strip-shaped glass plate 12 is reliably cut along the cutting line 14 as shown in Fig. 6 (C).

Thereafter, the pressure roller 28 rotates the control unit 36 (Fig. 1 (A)) at the end of the pushing-up operation (including just before the end or immediately after the flow) of the first projection 46 shown in Fig. 6 (See FIG. 6 (D)) by the driving unit 34 controlled by the driving unit 34 (see FIG.

6D, the leading edge portion 12A of the strip-shaped glass plate 12 does not collide with the pressure roller 26 but falls down toward the roller 22 by its own weight.

Therefore, according to the cutting apparatus 10 of the embodiment, even if the pressing roller 28 is disposed close to the cutting rotary roller 44, the leading edge portion 12A of the band-shaped glass sheet 12 immediately after cutting It is possible to prevent the pressure roller 28 from colliding with the pressure roller 28.

The pressing roller 28 is rotated by the driving unit 34 controlled by the control unit 36 after the leading edge 12A of the band-shaped glass plate 12 passes under the pressure roller 28, As shown in FIG. 6 (E), to the original normal position where it contacts the upper surface of the strip-shaped glass plate 12. As a result, the strip-shaped glass plate 12 can be cut along the next cutting line 14.

6 (C), when the strip-shaped glass sheet 12 is cut along the cutting line 14, the leading edge portion 12A (12A) of the strip-shaped glass sheet 12 As shown in Fig. 6 (D), comes into contact with the second projection 48 and passes through the cutting rotary roller 44 without falling on the surface of the roller of the cutting rotary roller 44. [ Thus, breakage of the leading edge portion 12A caused by falling of the leading edge rim 12A onto the roller surface can be prevented. In this case, it is possible to perform cutting with high precision by driving the cutting rotary roller 44 by the servo motor.

The cutting rotary roller according to the present invention is not limited to the one provided with the first protrusions 46 and the second protrusions 48 but may be provided with only the first protrusions 46, for example.

Although the present invention has been described in detail with reference to specific embodiments, it is apparent to those skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the present invention.

This application is based on Japanese Patent Application 2013-244754 filed on November 27, 2013, the contents of which are incorporated herein by reference.

10 ... Cutting device
12 ... Band-shaped glass plate
12A ... The front edge portion
13 ... Band-shaped glass plate
13A ... Ear
14 ... Cutting line
15 ... Product glass plate
16 ... Cutting roller
17 ... Glass plate
18 ... roller
20 ... Roller conveyor
22 ... roller
24 ... Roller conveyor
26 ... Pressure roller
28 ... Pressure roller
30 ... Rectangular glass plate
32 ... Servo Motor
34 ... The driving unit
36 ... The control unit
38 ... Drive mechanism
40 ... Drive mechanism
42 ... Measuring device
44 ... Rotation roller for cutting
46 ... The first projection
48 ... The second projection

Claims (9)

A roller conveyor for horizontally conveying the glass sheet having the cut line processed from the upstream side to the downstream side,
Cutting means for cutting the glass plate along the cutting line by pushing the lower surface of the glass plate being conveyed by the roller conveyor upward,
A pressing means disposed on the downstream side of the cutting means and contacting the upper surface of the glass plate to press the lower surface of the glass plate against the roller conveyor,
Driving means for retracting the pressing means against the upper surface of the glass plate,
The control means controls the driving means to retract the pressing means from the upper surface of the glass plate at the end of the pushing-up operation of the cutting means, and after the leading edge portion of the glass plate passes under the pressing means, The control means controls the driving means so as to return to the original position in contact with the upper surface of the driving means
And a cutting device for cutting the glass plate. 2. The image forming apparatus according to claim 1, wherein a height of the contact point when the leading edge of the glass sheet being conveyed by the roller conveyor contacts the roller of the roller conveyor,
The radius of the roller of the roller conveyor is R,
And the size of the gap between the rollers of the roller conveyor is G,
A glass plate cutting device set to G satisfying K < R. The glass sheet cutting apparatus according to claim 1 or 2, wherein the glass sheet has a thickness of 0.5 mm or less. The glass sheet cutting apparatus according to any one of claims 1 to 3, wherein the glass sheet has a thickness of 0.05 mm or more. The apparatus according to any one of claims 1 to 4, wherein the pressing means is in contact with the rim of the upper surface of the glass plate. The glass sheet cutting apparatus according to any one of claims 1 to 5, wherein the cutting means is an elevation member that moves up and down with respect to the lower surface of the glass sheet. 6. The image forming apparatus according to any one of claims 1 to 5, wherein the cutting means is a rotating roller,
And a projection for pushing the lower surface of the glass plate upwards is provided on the surface of the rotation roller. A conveying step of conveying the glass plate on which the cutting line has been formed by a roller conveyor in the horizontal direction from the upstream side toward the downstream side;
A cutting step of cutting the glass plate along the cutting line by pushing up the lower surface of the glass plate being conveyed by the roller conveyor by the cutting means,
A pressing step of pressing the lower surface of the glass plate against the roller conveyor by bringing the pressing means disposed on the downstream side of the cutting means into contact with the upper surface of the glass plate,
The pressing means is retracted from the upper surface of the glass plate at the end of the pushing up operation of the cutting means and after the leading edge portion of the glass plate passes under the pressing means, A pressing means for returning to the original position of contact,
And cutting the glass plate. A method of manufacturing a glass plate, comprising the method of cutting a glass plate according to claim 8.

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