JP2015101522A - Cutting device for glass plate, cutting method for glass plate, and manufacturing method for glass plate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a front end edge part of a glass plate just having been cut from striking on pressing means.SOLUTION: In a cutting device 10, the reverse surface of a belt-like glass plate 12 below a cutting line 14 is thrust up by an upward movement of a cutting roller 16. When the cutting roller 16 is moved up to an elevated position, the belt-like glass plate 12 is cut along the cutting line 14. When the belt-like glass plate 12 is cut, a press roller 28 abuts on the top surface of the belt-like glass plate 12 to press the reverse surface of the belt-like glass plate 12 against a roller 22 of a roller conveyor 24. Consequently, the belt-like glass plate 12 is securely cut along the cutting line 14. Then, the press roller 28 moves to retract from the top surface of the belt-like glass plate 12 at the end of the thrusting-up action of the cutting roller 16. Consequently, a front end edge part 12A of the belt-like glass plate 12 is conveyed by rollers 22 without striking on a press roller 26.

Description

  The present invention relates to a glass plate cutting device, a glass plate cutting method, and a glass plate manufacturing method.

  In Patent Documents 1 and 2 and the like, while a strip glass plate (also referred to as a glass ribbon) having a cutting line (also referred to as a cutting line or a scribe line) processed on its upper surface is conveyed in a horizontal direction by a roller conveyor, A glass plate cutting device for cutting along the cutting line is disclosed.

  The cutting apparatus of Patent Document 1 includes a push-up roll (hereinafter referred to as a cutting roller) as a cutting means, and the cutting apparatus of Patent Document 2 includes a substantially triangular prism breaker roll (hereinafter referred to as a cutting machine) as the cutting means. It is called a roller for use.) These cutting rollers are moved up and rotated with respect to the lower surface of the belt-shaped glass plate to push the belt-shaped glass plate upward with respect to the transport surface. Thereby, a bending moment is generated in the cutting line, and the strip glass plate is cut along the cutting line.

  In the cutting devices of Patent Documents 1 and 2, press rolls (pressing means) are arranged on the upstream side and the downstream side in the conveyance direction of the belt-shaped glass plate with the cutting roller interposed therebetween. These presser rolls are brought into contact with the upper surface of the belt-shaped glass plate. Therefore, since the bending moment in the opposite direction can be applied to both sides of the cutting line by the cutting operation of the cutting roller and the pressing action of the pressing roll, the belt-like glass plate is reliably cut along the cutting line.

  The cutting apparatus and the cutting line processing apparatus are disposed adjacent to a glass plate manufacturing apparatus using a float method or the like. That is, a cutting line is processed by the cutter of the cutting line processing apparatus while transporting the strip-shaped glass sheet after the slow cooling continuously manufactured by the glass plate manufacturing apparatus in that state. The processing direction of the cutting line is a direction orthogonal to the transport direction of the strip glass plate. After processing the cutting line, the strip glass plate is cut by the cutting device. Thereby, the rectangular glass plate of a predetermined size can be obtained from a strip-shaped glass plate.

  In addition, as a glass plate manufactured by the said glass plate manufacturing apparatus, the glass panel of thickness several mm or more used for the object for construction, a vehicle, etc., and FPD (Flat Panel Display which requires high dimensional accuracy and shape accuracy are required. A glass plate having a thickness of 0.7 mm or less is used. It is also known that as the thickness of the produced band-shaped glass plate decreases, the production rate of the band-shaped glass plate increases and the conveyance speed of the band-shaped glass plate increases.

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

  By the way, in the conventional glass plate cutting device, there is a problem that the leading edge of the strip-shaped glass plate immediately after being cut collides with a presser roll arranged on the downstream side of the cutting roller. The frequency of occurrence of this problem increased as the thickness of the strip-shaped glass plate was reduced, and was particularly noticeable in strip-shaped glass plates having a thickness of 0.5 mm or less. That is, a strip glass plate having a thickness of 0.5 mm or less is easily bent and has a high conveyance speed.

  The collision problem may be achieved by separating the pressing roller on the downstream side with respect to the cutting roller in the downstream direction by a distance that can avoid the collision. However, since the band-shaped glass plate has a property of being easily bent as it becomes thinner, if the pressing roller on the downstream side is excessively separated from the cutting roller, most of the cutting operation of the cutting roller bends the band-shaped glass plate. Acts as a force. Therefore, an effective bending moment cannot be applied to the cutting line.

  In other words, in order to smoothly cut the strip-shaped glass plate having a thickness of 0.5 mm or less along the cutting line, it is necessary to dispose the pressing roller on the downstream side close to the cutting roller. In such a situation, the collision problem cannot be avoided.

  In addition, a glass strip with a thickness of 0.5 mm or less is easily bent due to its own weight, so that the leading edge collides with the roller during conveyance by the roller conveyor and may be caught under the roller. It was.

  The present invention has been made in view of such circumstances, and even if it is a cutting device for a glass plate in which a pressing means arranged on the downstream side of the cutting means is arranged close to the cutting means, immediately after being cut. It aims at providing the cutting device of the glass plate which can prevent that the front-end edge part of this glass plate collides with a press means, the cutting method of a glass plate, and the manufacturing method of a glass plate.

  In one aspect of the present invention, in order to achieve the above object, a roller conveyor that horizontally conveys a glass plate processed with a cutting line from an upstream side toward a downstream side, and the glass that is being conveyed by the roller conveyor By pushing up the lower surface of the plate upward, a cutting means for cutting the glass plate along the cutting line and a downstream side of the cutting means, abutting on the upper surface of the glass plate, A pressing unit that presses the lower surface against the roller conveyor; a driving unit that moves the pressing unit against the upper surface of the glass plate; and at the end of the pushing-up operation of the cutting unit, the pressing unit is moved to the upper surface of the glass plate. The original position where the driving means is controlled so as to be retracted from and the top edge of the glass plate contacts the upper surface of the glass plate after passing below the pressing means Providing a cutting apparatus for a glass plate, characterized in that it comprises a control means for controlling said drive means so as to return movement.

  In one aspect of the present invention, in order to achieve the above object, a glass plate processed with a cutting line is conveyed in a horizontal direction from an upstream side to a downstream side by a roller conveyor, and is being conveyed by the roller conveyor. A cutting step of cutting the glass plate along the cutting line by pushing up the lower surface of the glass plate by a cutting means, and a pressing means arranged on the downstream side of the cutting means. A pressing step of contacting the upper surface and pressing the lower surface of the glass plate against the roller conveyor; and at the end of the pushing-up operation of the cutting device, the pressing device is retreated from the upper surface of the glass plate, and A pressing means movement control step of moving the pressing means back to the original position in contact with the upper surface of the glass plate after the leading edge passes below the pressing means; Providing the providing method for cutting a glass sheet according to claim.

  According to an aspect of the present invention, the glass plate is conveyed by the roller conveyor in the conveying step, and the lower surface below the cutting line processed into 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 this cutting, the pressing means abuts on the upper surface of the glass plate and presses the lower surface of the glass plate against the roller conveyor in the pressing step, so that the glass plate is reliably cut along the cutting line. Thereafter, the operation of the pressing means is controlled by the control means in the pressing means movement control step as follows. That is, at the end of the pushing-up operation of the cutting means (including immediately before and after the end), the pressing means is retreated from the upper surface of the glass plate by the driving means controlled by the control means. The position where the pressing means retreats is preferably above the glass plate, but may be on the side of the glass plate. Thereby, even if it is a glass plate cutting device in which the pressing means arranged on the downstream side of the cutting means is arranged close to the cutting means, the front edge of the glass plate immediately after being cut collides with the pressing means. Can be prevented. Then, after the front edge of the glass plate passes below the pressing device, the pressing device is moved back to the original position in contact with the upper surface of the glass plate by the driving device controlled by the control device. Thereby, a glass plate can be cut | disconnected along the following cutting line.

  One aspect of the present invention is that the distance from the apex of the roller when the tip edge of the glass plate being conveyed by the roller conveyor contacts the roller of the roller conveyor is K, and the roller When the radius of the roller of the conveyor is R and the size of the gap between the rollers of the roller conveyor is G, it is preferable to set G to satisfy K <R.

  According to one aspect of the present invention, even when the leading edge of the glass plate is bent downward by its own weight during conveyance by the roller conveyor and the leading edge collides with the surface of the roller, the leading edge is It can prevent being caught downward.

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

  In the case of a cutting device in which a glass plate is continuously conveyed from a glass plate manufacturing apparatus using a manufacturing method such as a float method and a down draw method and cuts the glass plate, the glass plate is reduced as the thickness of the glass plate is reduced. It is easy to bend and the conveyance speed is also increased. Therefore, the cutting device of one embodiment 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 unit is in contact with an edge portion of the upper surface 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 aspect of the present invention, the cutting means is preferably a lifting member that 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 that rises relative to the lower surface of the glass plate, pushes up the glass plate, and cuts the glass plate along a cutting line. In this case, it is possible to perform cutting with high accuracy by driving the elevating member up by a servo motor.

  In one aspect of the present invention, it is preferable that the cutting means is a rotating roller, and a surface of the rotating roller is provided with a protrusion that pushes up a lower surface of the glass plate.

  According to one aspect of the present invention, the lower surface below the cutting line of the glass plate is pushed up by the protrusion of the rotating roller, and the glass plate is cut along the cutting line. In this case, the cutting can be performed with high accuracy by driving the rotating roller by a servo motor.

  One aspect of the present invention provides a method for producing a glass plate, comprising the method for cutting a glass plate of one aspect of the present invention in order to achieve the above object.

  As described above, according to the glass plate cutting device, the glass plate cutting method, and the glass plate manufacturing method of the present invention, the pressing means arranged on the downstream side of the cutting means is arranged close to the cutting means. Even if it is a cutting device of a glass plate, it can prevent that the front-end edge part of the glass plate just after cut | disconnecting collides with a press means.

Top view of the glass sheet cutting device of the embodiment Side view of the glass sheet cutting apparatus shown in FIG. (A)-(E) is explanatory drawing which showed the raising / lowering operation | movement of the roller for a cutting | disconnection of a cutting device, and a pressing roller in time series. Main part enlarged side view for explaining a suitable gap between rollers (A), (B) is the top view which showed the suitable contact position of the press roller with respect to a strip | belt-shaped glass plate (A)-(E) is explanatory drawing which showed the raising / lowering operation | movement of the rotation roller for a cutting | disconnection of a cutting device, and a presser roller in time series.

  Hereinafter, preferred embodiments of a glass plate cutting device, a glass plate cutting method, and a glass plate manufacturing method according to the present invention will be described with reference to the accompanying drawings.

  FIG. 1 is a top view of the glass sheet cutting device 10 of the embodiment, and FIG. 2 is a side view of the glass sheet cutting device 10 shown in FIG. In these drawings, the conveyance 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 a glass plate to be cut, a belt-like glass plate 12 having a preferable thickness of 0.5 mm or less is exemplified, but the thickness of the belt-like glass plate 12 is not limited thereto. However, it is easy to bend and the conveyance speed is increased in manufacturing, preferably 0.5 mm or less, and more preferably 0.3 mm or less when the strip-shaped glass plate 12 is cut. The cutting device 10 is particularly effective. Such a thin strip-shaped glass plate 12 is used as a glass plate for FPD, which requires high dimensional accuracy and shape accuracy.

[Configuration of Cutting Device 10]
As shown in FIG. 2, the cutting device 10 includes a cylindrical cutting roller (cutting means: lifting member) 16 that cuts the strip-shaped glass plate 12 having the cutting line 14 processed on the upper surface along the cutting line 14. . Further, a roller conveyor 20 including a plurality of cylindrical rollers 18 is provided on the upstream side of the cutting roller 16 in the conveying direction of the strip glass plate 12. The band-shaped glass plate 12 is conveyed by the roller conveyor 20 in the horizontal direction and in the conveyance direction indicated by the arrow A. Further, a roller conveyor 24 including a plurality of cylindrical rollers 22 is provided on the downstream side of the cutting roller 16 in the transport direction.

  In addition, although these rollers 18 and 22 are installed so that an upper surface level may become the same height, you may install so that height may become high toward a downstream. The diameter of the cutting roller 16 is larger than the diameter of the rollers 18 and 22, but the diameter of the cutting roller 16 may be smaller than the diameter of the rollers 18 and 22.

  Furthermore, in order to make it easy to cut the strip-shaped glass plate 12, a pressing roller 26 is disposed upstream of the cutting roller 16 in the conveying direction, and a pressing roller (pressing means) 28 is disposed downstream of the conveying direction. Is placed. The presser rollers 26 and 28 are rollers having the same shape, and are provided at symmetrical positions with respect to the cutting roller 16.

  The presser roller 26 is brought into contact with the upper surface of the belt-shaped glass plate 12, whereby the lower surface of the belt-shaped glass plate 12 is pressed against the rollers 18 of the roller conveyor 20. The presser roller 28 is brought into contact with the upper surface of the band-shaped glass plate 12 immediately before cutting, and the lower surface of the band-shaped glass plate 12 is pressed against the rollers 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, whereby the rectangular glass plate 30 is pressed against the rollers 22 of the roller conveyor 24.

  In FIG. 1, the roller conveyors 20 and 24 are omitted in order to clearly show the arrangement positions of the cutting rollers 16. Further, as shown in FIG. 1, the pressing rollers 26 and 28 are arranged in a direction orthogonal to the conveying direction of the band-shaped glass plate 12, and abut on the entire width of the band-shaped glass plate 12 and the entire width of the rectangular glass plate 30. Configured to be length. The materials of the pressing rollers 26 and 28 and the cutting roller 16 are not particularly limited, but materials that do not damage the band-shaped glass plate 12 and the rectangular glass plate 30 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 orthogonal to the transport direction.

  Further, when the rectangular glass plate 30 is cut off from the belt-like glass plate 12 as shown in FIG. 2, the peripheral speed of the roller 22 of the roller conveyor 24 is increased for a predetermined time with respect to the peripheral speed of the roller 18 of the roller conveyor 20. Controlled. Thereby, the several rectangular glass plate 30 cut | disconnected continuously is conveyed toward the plate-plate part (not shown) of the downstream of the roller conveyor 24 in the state where the predetermined space | interval was opened. Thereby, the damage by contact with the adjacent rectangular glass plate 30 is prevented.

<Up / Down Control of Cutting Roller 16 and Pressing Roller 28>
The cutting device 10 includes a servo motor 32 that moves the cutting roller 16 up and down, and a drive unit (drive means) 34 that moves the press roller 28 forward and backward with respect to the upper surface of the belt-like glass plate 12. In addition, the cutting apparatus 10 includes a servo motor 32 and a control unit (control means: Controller) 36 that controls the drive unit 34.

  The drive unit 34 includes an electromagnetic valve and a speed controller, and the control unit 36 controls the supply and stop of fluid (air) by the electromagnetic valve, thereby turning on / off the drive mechanism 40 that raises and lowers the presser roller 28. Be controlled. Further, by controlling the flow rate of the fluid by the speed controller by the control unit 36, the elevating speed of the drive mechanism 40 is controlled. Note that a servo motor may be used as the drive unit 34.

  The servo motor 32 and the drive unit 34 are driven according to an operation command (for example, a pulse train having a predetermined frequency) output from the control unit 36. The servo motor 32 is connected to the cutting roller 16 via a known drive mechanism 38 such as a ball screw device, and is rotated according to an operation command from the control unit 36, and the rotational motion is linearly moved by the drive mechanism 38. Is converted to As a result, the cutting roller 16 is moved up and down. The normal position of the cutting roller 16 is set to a position where the upper surface level of the cutting roller 16 is at the same height as the upper surface level of the roller 18, as indicated by a two-dot chain line in FIG. When the cutting roller 16 is raised from the normal position to the raised position shown by the solid line in FIG. 2, the lower surface of the band-shaped glass plate 12 is pushed upward. Further, 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.

  Similarly, the drive unit 34 is connected to the presser roller 28 via a known drive mechanism 40, and is driven in accordance with an operation command from the control unit 36, whereby the presser roller 28 is moved up and down. The normal position of the pressing roller 28 is set to a position in contact with the upper surface of the band-shaped glass plate 12 as shown by the solid line in FIG. The presser roller 28 is lifted from the normal position to the raised position indicated by the two-dot chain line in FIG. Further, the presser roller 28 is immediately lowered from the raised position and returned to the normal position in accordance with the operation command output from the control unit 36.

  The operation command for starting the ascent of the cutting roller 16 and the operation command for starting the ascent of the presser roller 28 output from the control unit 36 to the servo motor 32 clearly indicate the positional relationship between the cutting roller 16 and the cutting line 14. For example, the output is based on an output signal from a known measuring device 42 that measures the transport amount of the glass strip 12 while contacting the glass strip 12. In addition, the operation command to start raising the presser roller 28 is output at the end of the push-up operation of the cutting roller 16 (including immediately before and after the end). As a result, the band-shaped glass plate 12 is reliably cut along the cutting line 14 by the lifting operation that is the cutting operation of the cutting roller 16 and the pressing action of the pressing roller 28.

  Note that, as an operation control method for starting to raise the presser roller 28, the drive unit 34 may be time-controlled so as to start rising after a predetermined time with respect to the time when the cutting roller 16 starts to rise. Further, driving means such as an air cylinder may be used in place of the servomotor 32. However, if the servomotor 32 is used, the rising start operation can be finely controlled, so that the thin glass strip 12 is cut. It is suitable for.

[Operation of Cutting Device 10]
FIGS. 3A to 3E are explanatory diagrams showing the lifting and lowering operations of the cutting roller 16 and the pressing roller 28 in time series. 3 indicates the rotation direction of the roller 18, arrow C indicates the rotation direction of the presser roller 26, arrow D indicates the rotation direction of the cutting roller 16, and arrow E indicates the rotation direction of the roller 22. The arrow F indicates the direction of rotation of the presser roller 28. An arrow G indicates the moving direction of the cutting roller 16 ascending / descending, and an arrow H indicates the moving direction of the pressing roller 28 ascending / descending.

  As shown in FIG. 3A, when the belt-like glass plate 12 is conveyed by the roller conveyor 20 (conveying process) and the cutting line 14 approaches above the cutting roller 16, an operation signal from the control unit 36 is obtained. The servo motor 32 (see FIGS. 1 and 2) is driven based on the above, and the upward movement of the cutting roller 16 is started as indicated by an arrow G.

  Then, as shown in FIG. 3 (B), the lower surface below the cutting line 14 of the strip glass plate 12 is pushed up by the upward movement indicated by the arrow G of the cutting roller 16.

  And as shown in FIG.3 (C), when the cutting roller 16 is raised to a raise position, the strip | belt-shaped glass plate 12 is cut | disconnected along the cutting line 14 (cutting process).

  When the strip-shaped glass plate 12 shown in FIGS. 3A to 3C is cut, the presser roller 28 is located at a normal position and abuts the upper surface of the strip-shaped glass plate 12 to roll the lower surface of the strip-shaped glass plate 12. The roller 22 of the conveyor 24 is pressed (pressing process). Thereby, the strip-shaped glass plate 12 is cut | disconnected reliably along the cutting line 14 like FIG.3 (C).

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

  First, the presser roller 28 is moved by the drive unit 34 controlled by the control unit 36 at the end of the pushing-up operation of the cutting roller 16 shown in FIG. As shown in FIG. 3, the sheet is retracted from the upper surface of the band-shaped glass plate 12 and is raised to the raised position shown in FIG.

  As a result, as shown in FIG. 3D, the front end edge portion 12A of the belt-like glass plate 12 does not collide with the pressing roller 26 but falls toward the roller 22 by its own weight.

  Therefore, according to the cutting device 10 of the embodiment, even if the presser roller 28 is disposed close to the cutting roller 16, the leading edge 12 </ b> A of the strip-shaped glass plate 12 immediately after being cut collides with the presser roller 28. Can be prevented.

  Thereafter, the presser roller 28, as shown in FIG. 3 (E), is driven by the drive unit 34 controlled by the control unit 36 after the front end edge 12A of the belt-like glass plate 12 passes below the presser roller 28. The plate 12 is moved back to the normal position where it contacts the upper surface of the plate 12. Thereby, the strip-shaped glass plate 12 can be cut along the next cutting line 14.

  The position where the presser roller 28 is retracted is preferably above the band-shaped glass plate 12 as shown in FIG. 3 (D), but may be on the side of the band-shaped glass plate 12. Further, the cutting roller 16 is moved downward in the direction of the arrow G from the upper position shown in FIG. 3C and returned to the normal position shown in FIG.

<Setting the size of the gap between the rollers 18 (22)>
The band-shaped glass plate 12 having a thickness of 0.5 mm or less (more preferably 0.3 mm or less) has a leading edge 12 </ b> A that is easily bent due to its own weight, so that the leading edge 12 </ b> A is a roller during conveyance by the roller conveyor 20 (24). It may collide with the surface of 18 (22) and may be caught under roller 18 (22).

  The size of the gap between the rollers 18 (22) for preventing the above problems is set.

  FIG. 4 is an enlarged side view of a main part for explaining the size of a suitable gap between the rollers 18 (22).

  According to FIG. 4, the front edge 12A (30A) of the belt-like glass plate 12 (including the rectangular glass plate 30) being conveyed by the roller conveyor 20 (24) is the roller 18 (22) of the roller conveyor 20 (24). ), The height of the contact point from the apex P of the roller 18 (22) is K, the radius of the roller 18 (22) is R, and the size of the gap between the rollers 18 (22) (shortest) When the distance is G, it is preferable to set G to satisfy K <R.

  By setting G as described above, the leading edge 12A (30A) of the belt-shaped glass plate 12 (30) is bent downward by its own weight during the conveyance by the roller conveyor 20 (24), and the leading edge 12A (30A) Even when it collides with the surface of the roller 18 (22), the leading edge 12A (30A) can be prevented from being caught under the roller 18 (22).

  Note that G satisfying K <R is also applied 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. In FIG. 3, the cutting roller 16 is always in contact with the lower surface of the band-shaped glass plate 12, but is not in contact with the lower surface of the band-shaped glass plate 12 except during cutting, that is, below the band-shaped glass plate 12. It may be in the form of being evacuated. In this embodiment, G between the roller 18 and the roller 22 is set to a value that satisfies K <R. Note that G is set in the same manner in the form of FIG.

<About the thickness of the strip-shaped glass plate 12>
Further, 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, and more preferably 0.3 mm or less.

  In the case of a cutting device in which a strip glass plate is continuously transported from a glass plate manufacturing apparatus using a manufacturing method such as a float method and a downdraw method, and the strip glass plate is cut, as the thickness of the strip glass plate becomes thinner The band-shaped glass plate is easily bent and the conveyance speed is increased. Therefore, the cutting device 10 of the embodiment can be effectively applied to the strip-shaped glass plate 12 having a thickness of 0.5 mm or less. Note that the cutting device 10 of the embodiment can be effectively applied even to the strip-shaped glass plate 12 having a thickness of 0.3 mm or less.

<Other types of presser rollers>
5A and 5B are plan views showing suitable contact positions of the press roller with respect to the belt-shaped glass plate.

  FIG. 5 (A) shows a band-shaped glass plate 12 whose ears have been cut in advance, and FIG. 5 (B) shows a band-shaped glass plate 13 having ears 13A. The product glass plate 15 is the inner region of the two-dot chain line L shown in FIGS. 5A and 5B (the central surface that is the product surface of the upper surface of the glass plate). Further, the ear portion 13 </ b> A is a glass plate that is formed along the conveying direction at both edges of the belt-like glass plate 13 during the production of the belt-like glass plate 13, and is thicker than the product glass plate 15. It is a board.

  5A, the presser roller 28A is in contact with the glass plate 17 in the outer region of the product glass plate 15 excluding the product glass plate 15. In FIG. 5B, the presser roller 28B is in contact with the ear portion 13A. Touched.

  Thus, by contacting the press rollers 28A and 28B to the outside of the product glass plate 15, the quality region on the upper surface of the product glass plate 15 can be protected from the press rollers 28A and 28B. The same applies to the presser roller 26. The said quality area | region is an area | region where exact | strict quality is requested | required as a glass plate for FPD. By bringing the press rollers 28A and 28B into contact with the outside of the quality region, it is possible to prevent surface defects in the quality region due to the contact of the press rollers 28A and 28B.

<Other forms of cutting means>
6A to 6E show a cutting rotary roller (rotating roller) 44 as another cutting means. 6 (A) to 6 (E) show the lifting and lowering operations of the cutting rotary roller 44 and the pressing roller 28 in time series. Furthermore, the arrow J indicates the rotation direction of the cutting rotary roller 44, and the other arrows A, B, C, E, F, H indicate the directions indicated by arrows A, B, C, E, F, FIG. The direction is the same as indicated by H.

  On the surface (circumferential surface) of the cutting roller 44 for cutting, a first protrusion 46 that pushes the lower surface of the glass strip 12 upward on the upstream side in the rotation direction, and a first protrusion 46 on the downstream side in the rotation direction of the first protrusion 46. A second protrusion 48 disposed adjacent to the protrusion 46 is provided.

  As shown in FIG. 6A, when the belt-like glass plate 12 is conveyed by the roller conveyor 20 and the cutting line 14 approaches above the cutting rotary roller 44, the rotation of the cutting rotary roller 44 is changed to the arrow J. It starts like this.

  Then, as shown in FIG. 6B, the lower surface below the cutting line 14 of the strip-shaped glass plate 12 is pushed up by the first protrusion 46 by the rotation indicated by the arrow J of the cutting rotation roller 44.

  Then, as shown in FIG. 6C, the strip-shaped glass plate 12 is cut along the cutting line 14 at a position where the first protrusion 46 faces upward.

  When the strip glass plate 12 shown in FIGS. 6A to 6C is cut, the presser roller 28 is located at a normal position and abuts the top surface of the strip glass plate 12 to roll the bottom surface of the strip glass plate 12 on the roller. The roller 22 of the conveyor 24 is pressed. Thereby, the strip-shaped glass plate 12 is cut | disconnected reliably along the cutting line 14 like FIG.6 (C).

  Thereafter, the pressing roller 28 is controlled by the control unit 36 (see FIGS. 1 and 2) at the end of the push-up operation of the first protrusion 46 shown in FIG. 6C (including immediately before the end or immediately after the flow rate). The controlled drive unit 34 is retracted from the upper surface of the band-shaped glass plate 12 as indicated by an arrow H, and is moved up to the raised position shown in FIG.

  As a result, as shown in FIG. 6D, the leading edge portion 12A of the belt-like glass plate 12 does not collide with the press roller 26 and falls toward the roller 22 by its own weight.

  Therefore, according to the cutting device 10 of the embodiment, even if the presser roller 28 is disposed close to the cutting rotation roller 44, the leading edge 12 </ b> A of the band-shaped glass plate 12 immediately after being cut collides with the presser roller 28. Can be prevented.

  Thereafter, the presser roller 28 is driven by the drive unit 34 controlled by the control unit 36 after the front end edge 12A of the belt-like glass plate 12 passes below the presser roller 28, as shown in FIG. The plate 12 is moved back to the normal position where it contacts the upper surface of the plate 12. Thereby, the strip-shaped glass plate 12 can be cut along the next cutting line 14. Further, the cutting roller 16 is moved downward in the direction of arrow G from the upper position shown in FIG. 6C, and returns to the normal position shown in FIG.

  On the other hand, according to the cutting rotary roller 44, when the strip glass plate 12 is cut along the cutting line 14 as shown in FIG. 6C, the leading edge 12A of the strip glass plate 12 is changed to FIG. As shown in FIG. 4, the second protrusion 48 is contacted and passes through the cutting rotary roller 44 without falling on the roller surface of the cutting rotary roller 44. As a result, it is possible to prevent the leading edge portion 12A from being damaged due to the leading edge portion 12A falling on the roller surface. In this case, high-precision cutting can be performed by driving the cutting rotary roller 44 by a servo motor.

  The cutting rotation roller in the present invention is not limited to the form provided with the first protrusion 46 and the second protrusion 48, and may be a form provided with only the first protrusion 46, for example.

  DESCRIPTION OF SYMBOLS 10 ... Cutting device, 12 ... Band-shaped glass plate, 12A ... Tip edge part, 13 ... Band-shaped glass plate, 13A ... Ear part, 14 ... Cutting line, 15 ... Product glass plate, 16 ... Roller for cutting, 17 ... Glass plate, DESCRIPTION OF SYMBOLS 18 ... Roller, 20 ... Roller conveyor, 22 ... Roller, 24 ... Roller conveyor, 26 ... Pressing roller, 28 ... Pressing roller, 30 ... Rectangular glass plate, 32 ... Servo motor, 34 ... Drive part, 36 ... Control part, 38 ... Drive mechanism, 40 ... Drive mechanism, 42 ... Measurement device, 44 ... Rotating roller for cutting, 46 ... First projection, 48 ... Second projection

Claims (8)

A roller conveyor that transports a glass plate processed with a cutting line in a horizontal direction from the upstream side to the downstream side;
Cutting means for cutting the glass plate along the cutting line by pushing up the lower surface of the glass plate being conveyed by the roller conveyor;
A pressing unit disposed on the downstream side of the cutting unit, abutting on the upper surface of the glass plate and pressing the lower surface of the glass plate against the roller conveyor;
Driving means for retracting and moving the pressing means relative to the upper surface of the glass plate;
At the end of the pushing-up operation of the cutting means, after controlling the driving means so as to retract the pressing means from the upper surface of the glass plate, and after the front edge of the glass plate passes below the pressing means Control means for controlling the drive means to return to the original position contacting the upper surface of the glass plate;
An apparatus for cutting a glass plate, comprising: The height from the top of the roller of the contact point when the tip edge of the glass plate being conveyed by the roller conveyor contacts the roller of the roller conveyor is K,
The radius of the roller of the roller conveyor is R,
When the size of the gap between the rollers of the roller conveyor is G,
The glass sheet cutting device according to claim 1, wherein G is set to satisfy G <K.   The glass plate cutting device according to claim 1 or 2, wherein the glass plate has a thickness of 0.5 mm or less.   The said press means is a cutting device of the glass plate of Claim 1, 2, or 3 contact | abutted to the edge part of the upper surface of the said glass plate.   The said cutting | disconnection means is a raising / lowering member which moves up / down with respect to the lower surface of the said glass plate, The cutting device of the glass plate of any one of Claim 1 to 4. The cutting means is a rotating roller;
The glass plate cutting device according to any one of claims 1 to 4, wherein the surface of the rotating roller is provided with a protrusion that pushes the lower surface of the glass plate upward. A transporting step of transporting the glass plate in which the cutting line is processed from the upstream side to the downstream side by a roller conveyor in a horizontal direction;
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 upward by a cutting means;
A pressing step of pressing the pressing means disposed on the downstream side of the cutting means against the upper surface of the glass plate and pressing the lower surface of the glass plate against the roller conveyor;
At the end of the pushing-up operation of the cutting means, the pressing means is retreated from the upper surface of the glass plate, and the pressing means is moved to the bottom of the glass plate after the front edge of the glass plate passes below the pressing means. A pressing means movement control step for returning to the original position in contact with the upper surface;
A method for cutting a glass plate, comprising:   A method for producing a glass plate, comprising the method for cutting a glass plate according to claim 7.

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