JP5472235B2 - Glass plate cutting method and glass plate cutting machine - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a glass plate cutting method and a glass plate cutting machine for cutting glass plates for window glass of automobiles, glass plates for buildings such as buildings and general houses, and crystallized glass plates as glass plates for kitchens.

  For example, as shown in Patent Document 1, a glass plate cutting machine that cuts a glass plate in order to cut the glass plate moves a cutter wheel as a cutting blade with respect to the glass plate by a moving device and uses an air cylinder device. The cutter wheel is pressed against the glass plate.

JP 2002-274875 A

  Generally, a crystallized glass plate is used as a glass plate for kitchen (IH glass). However, this crystallized glass is hard in material, and even if a straight portion is cut (cut line) by a normal glass cutting method. Nu (progress of cracks) is difficult to enter sufficiently and cleanly. In particular, the window glass for automobiles and the glass plate for kitchens (IH glass) are provided with a corner portion having an arc shape. When cutting and producing a glass plate having such a rounded corner, the new fissures do not enter the cut line portion of the rounded corner at the corner sufficiently and cleanly, and the progress is not sufficiently performed. . As the glass thickness increases to 5 mm and 6 mm, and the diameter of the radius decreases, it is difficult to sufficiently insert new glass. As a countermeasure, the conventional cutting machine increases the pressing force that presses the cutter against the glass plate when cutting from the straight part to the corner part when cutting the rounded part of the corner. Cut it down extremely. Nevertheless, when the corner is cut deep enough so that a clean new does not enter and it is folded, the cross section becomes a jagged surface and it is difficult to obtain a good clean surface.

  The present invention has been made in view of the above-mentioned points, and the object of the present invention is to cut deeply and cleanly in a crystallized glass plate or the like, not only in a straight part but also in a rounded corner shape. It is providing the glass plate cutting method and glass plate cutting machine which can form a line | wire in a glass plate.

  In the glass plate cutting method of the present invention, the cutting blade is moved along a preset cutting line to be formed with respect to the glass plate, and the elastic pressing force of the cutting blade against the glass plate is alternately changed in strength during this movement. The cutting blade is elastically pressed against the glass plate while switching to, and a cut line is formed on the glass plate.

  According to the method for cutting a glass plate of the present invention, in order to alternately switch the elastic pressing force of the cutting blade against the glass plate alternately, a cutting line with deeper and more advanced new (breaking) is formed on the glass plate. be able to.

  In a preferred example of the glass plate cutting method of the present invention, the strength of the elastic pressing force of the cutting blade against the glass plate is alternately switched at certain time intervals during the movement of the cutting blade.

  In a preferred example of the glass plate cutting method of the present invention, the cutting blade is elastically pressed against the glass plate by air pressure.

  In a preferred example of the glass plate cutting method of the present invention, the strength of the elastic pressing force of the cutting blade with respect to the glass plate is alternately switched every 30 ms to 70 ms.

  The glass plate cutting method of the present invention is a movement that moves the cutting blade along the rounded portions such as the corner portion and the tip portion while alternately switching the strength of the elastic pressing force of the cutting blade with respect to the glass plate at regular time intervals. The speed is lower than the moving speed at which the cutting blade is moved along the straight line portion. Moreover, in the example of the glass plate cutting method of this invention, the moving speed moved along rounded parts, such as a corner part and a pointed part, may be speed-adjusted according to the curvature of the said rounded part.

  The glass plate cutting machine of the present invention comprises a cutting blade for forming a cutting line on a glass plate, a moving means for moving the cutting blade along a cutting line to be formed in advance with respect to the glass plate, and the cutting device. Control for controlling the elastic pressing device to alternately switch the strength of the elastic pressing force of the cutting blade against the glass plate in the movement of the cutting blade by the moving means and the elastic pressing device that elastically presses the blade against the glass plate Device.

  According to the glass plate cutting machine of the present invention, it is equipped with a control device that controls the elastic pressing device so as to alternately switch the strength of the elastic pressing force of the cutting blade against the glass plate, particularly when the cutting blade is moved by the moving means. Therefore, it is possible to form a cut line in which a new (break) is advanced deeply and cleanly on the glass plate.

  In a preferred example of the glass sheet cutting machine according to the present invention, the control device switches the elastic pressing device so as to alternately switch the strength of the elastic pressing force of the cutting blade against the glass plate during the movement of the cutting blade. It comes to control.

  In a preferred example of the glass plate cutting machine of the present invention, the elastic pressing device is configured to elastically press the cutting blade against the glass plate by air pressure.

  In a preferred example of the glass sheet cutting machine of the present invention, the control device controls the elastic pressing device so as to alternately switch the strength of the elastic pressing force of the cutting blade against the glass plate at intervals of 30 ms to 70 ms. It has become.

  In the example of the glass plate cutting machine of the present invention, the control device sets the time interval for alternately switching the strength of the elastic pressing force of the cutting blade against the glass plate in the rounded portion such as the corner portion and the tip portion, and the cutting edge in the straight portion. The elastic pressing device may be controlled to be shorter than the time interval for alternately switching the strength of the elastic pressing force with respect to the glass plate.

  In the example of the glass plate cutting machine of the present invention, the control device controls the elastic pressing device so as to alternately switch the strength of the elastic pressing force of the cutting blade against the glass plate at regular time intervals, and The moving speed for moving the cutting edge by the moving means at the corner portion and the rounded portion at the tip is lower than the moving speed for moving the cutting edge by the moving means at the linear portion. In the example of the glass sheet cutting machine of the present invention, the moving speed for moving the rounded portion of the cutting line to be formed with the cutting blade set in advance by the moving means is adjusted according to the curvature of the rounded portion. Also good.

  According to the present invention, a glass plate having a small radius at the tip or corner as in the shape of an automotive window glass, or a crystallized glass such as kitchen glass (IH glass), and a rounded corner. A glass plate cutting method and a glass plate cutting machine capable of forming a cut line in which a sufficiently deep and clean new insertion has progressed in a pointed portion or a corner rounded shape as well as a linear shape portion in a glass plate or the like provided with a glass plate or the like.

FIG. 1 is an explanatory plan view of an example of an embodiment of the present invention. FIG. 2 is an explanatory front view of the example shown in FIG. FIG. 3 is a conceptual explanatory diagram of the example shown in FIG. FIG. 4 is a partially enlarged explanatory view of the example shown in FIG. FIGS. 5A and 5B are explanatory diagrams mainly relating to the cutter wheel in the example shown in FIG.

  Next, an example of an embodiment of the present invention will be described in more detail based on an example shown in the figure. The present invention is not limited to these examples.

  1 to 4, the glass plate cutting machine 1 of this example includes a cutting blade that forms a cutting line 3 on a glass plate 2, a cutter wheel 4 as a cutter chip that rolls on the glass plate 2 in this example, Moving means 5 for moving the cutter wheel 4 along the cutting line 3a shown in FIGS. 5A and 5B to be formed in advance with respect to the glass plate 2, and the cutter wheel 4 to the glass plate 2. The elastic pressing device 6 that elastically presses the elastic pressing device 6 and the elastic pressing device 6 are controlled so as to alternately switch the strength of the elastic pressing force of the cutter wheel 4 against the glass plate 2 when the cutter wheel 4 is moved by the moving means 5. The control apparatus 7 and the support stand 8 which supports the glass plate 2 in which the cut line 3 should be formed are comprised.

  The support base 8 includes a support base body 11 installed on the base 10 and a scratch-proof sheet 12 attached to the upper surface of the support base body 11, and the glass plate 2 is the scratch-proof sheet 12. The glass plate 2 is supported by being placed on.

  The moving means 5 includes an XY direction moving device 21 that moves the cutter wheel 4 with respect to the glass plate 2 placed on the support base 8 in the XY plane coordinates, and the cutter wheel 4 with respect to the glass plate 2 R. And a rotation device (angle control device) 22 that rotates in the direction.

  The X-Y direction moving device 21 moves the cutter wheel 4 in the X direction with respect to the glass plate 2, and moves the cutter wheel 4 in the Y direction perpendicular to the X direction with respect to the glass plate 2. And a Y-direction moving device 26 to be operated.

  The X-direction moving device 25 is fitted to the guide rails 33 and 34 that are arranged in parallel along the X direction on both sides of the support base body 11 and to the guide rails 33 and 34 so as to be movable in the X direction. X-direction movable bodies 37 and 38 having slide blocks 35 and 36, respectively, and a movable frame arranged above the support base 8 and extending in the Y-direction and erected on the X-direction movable bodies 37 and 38. 39, an X-axis servomotor 41 fixed to the X-direction movable body 37 via a stay 40, and the like, and is rotatably supported by the X-direction movable body 37 and is connected to the X-axis servomotor 41 by a pulley, a belt, etc. The pinion 43 connected via the X direction, and extends in the Y direction, is rotatably supported by the X direction movable bodies 37 and 38, and is connected to the X axis servo motor 41 at one end in the Y direction. A rotating pin 44, a pinion 46 that is rotatably supported by the X-direction movable body 38 and is connected to the other end of the rotating shaft 44 via a pulley, a belt 45, and the like, and pinions 43 and 46, respectively. The rack teeth 48 and 49 extending in the X direction are provided at both edges 31 and 32 of the support base body 11 and fixed to the lower surface 47 of the support base body 11. The cutter wheel 4 is attached to the movable frame 39 via the Y-direction moving device 26 and the like. The cutter head having the cutter wheel 4, the elastic pressing device 6, the rotating device 22, and the like is installed so as to move on the movable frame 39 in the Y direction.

  The X-direction moving device 25 rotates the pinion 43 via the pulley, the belt, etc. 42 by the operation of the X-axis servo motor 41, and rotates the pinion 46 via the rotary shaft 44, the pulley, the belt 45, etc. And 46, the X direction movable bodies 37 and 38 and the movable frame 39 are moved in the X direction along the rack teeth 48 and 49, and thus the cutter wheel 4 is moved in the X direction. In the movement of the movable frame 39 in the X direction, the X direction movable bodies 37 and 38 are guided in the X direction by the guide rails 33 and 34. The pinions 43 and 46 are connected to each other by the line shaft 44, and are rotated in mechanical synchronization with each other by the operation of the X-axis servo motor 41. Such an X-direction moving device 25 moves the cutter wheel 4 back and forth in the X direction.

  The Y-direction moving device 26 includes a pair of guide rails 51 and 52 that are fixed to the movable frame 39 and extend in the Y direction, and a slide block 53 that is fitted to the guide rail 51 so as to be movable in the Y direction. A Y-direction movable body 55 having 54, a Y-axis servo motor 56 fixed to the Y-direction movable body, a pinion 57 attached to the Y-axis servo motor 56, and the movable frame 39 via the guide rail 51. Rack teeth 58 extending in the Y direction. A cutter head is attached to the Y-direction movable body 55 shown in a substantially L shape in FIG. 4. The cutter head includes the elastic pressing device 6, the rotating device (angle control device) 22, and the cutter wheel 4 as described above. Have.

  The Y-direction moving device 26 rotates the pinion 57 by the operation of the Y-axis servo motor 56, and this rotation moves the Y-direction movable body 55 in the Y direction along the rack teeth 58, so that the cutter wheel 4 is moved. It is designed to move in the Y direction. The Y-direction movable body 55 is guided in the Y direction by the guide rails 51 and 52 when the pinion 57 is rotated. The Y-direction moving device 26 moves the cutter wheel 4 back and forth in the Y direction.

  The rotation device (angle control device) 22 includes an angle control motor 61 fixed to the Y-direction movable body 55, a rotation gear 62 attached to the angle control motor 61 and rotated by the operation of the angle control motor 61. The rotation gear 63 meshes with the gear 62, the rotation gear 63 is fixed, and the ball spline mechanism 64 on the inner peripheral surface 66a and the rod 65 extending in the Z direction perpendicular to the X and Y directions are used. And a rotating cylinder 66 connected to the cutter wheel 4.

  In this example, the rotating cylinder 66 has a cylindrical main body 67 that is integrally formed with a flange at the lower end and that defines an insertion hole in which the ball spline mechanism 64 and the rod 65 are arranged on the inner peripheral surface 66a. An annular annular plate 68 having an annular upper surface fixed to the flange portion of the cylindrical main body 67 and a rotating gear 63 fixed to the annular lower surface, and a flange attached to the outer peripheral surface 67b of the cylindrical main body 67. A bush 69 is provided. Such a rotating cylinder 66 is rotatably supported via a bearing 71 by a support 70 fixed to the Y-direction movable body 55. The cylindrical main body 67 is supported by the support body 70 so as not to drop off from the support body 70.

  The ball spline mechanism 64 transmits the rotation in the R direction of the rotating cylinder 66 about the axis O of the rod 65 to the rod 65 and moves the rod 65 up and down in the Z direction so that the rod 65 can be raised and lowered. Movement is allowed.

  The rotation device (angle control device) 22 rotates the cylindrical main body 67 in the R direction via the rotation gears 62 and 63 by the operation of the angle control motor 61, and this rotation is performed via the ball spline mechanism 64, the rod 65, and the like. Is transmitted to the cutter wheel 4, and the angle of the cutter wheel 4 is controlled in the R direction. The cutting edge of the cutter wheel 4 is oriented in the cutting line forming direction by being angle-controlled by a rotating device (angle control device) 22.

  The elastic pressing device 6 has an electro-pneumatic regulator 81 and a valve device 82 for lowering the cutter wheel 4, and has a higher air pressure than an air pressure for lowering the cutter wheel 4 by the electro-pneumatic regulator 81 and the valve device 82. The electro-pneumatic regulator 83 and the valve device 84 for lowering the wheel 4, the electro-pneumatic regulator 85 and the valve device 86 for raising the cutter wheel 4, and the valve devices 82, 84 and 86 are connected. The air cylinder device 87 fixed to the Y-direction movable body 55 and the upper end of the piston rod 88 of the air cylinder device 87 are rotatably attached to the outer end of the piston rod 88 via a holding body 89, and the cutter block 90 is attached to the lower end. The cutter wheel 4 can be freely mounted via And it includes a rod 65 that is.

  The electro-pneumatic regulators 81 and 83 and the normal regulator 85 connected to the control device 7 respectively apply predetermined air pressures based on signals from the control device 7 to the valve devices 82, 84 and 86. The electro-pneumatic regulators 81 and 83 and the ordinary regulator 85 are connected to the air cylinder device 87 via NO-type three-port valve devices 82, 84 and 86, respectively. Of course, the electro-pneumatic regulators 81 and 83 and the regulator 85 are respectively connected to a compressor (not shown). The electro-pneumatic regulators 81 and 83 are manually operated based on a signal from the control device 7. Thus, the air pressure from the compressor is adjusted to a predetermined air pressure and applied to each of the valve devices 82, 84 and 86. The electro-pneumatic regulator 81 applies a weak pressure to the valve device 82, and the electro-pneumatic regulator 83 applies a stronger pressure to the valve device 84 than the air pressure applied to the valve device 82. doing. The regulator 85 applies air pressure necessary for raising the cutter wheel 4 to the air cylinder device 87 via the holding body 89, the rod 65, and the cutter block 90.

  In this example, the valve device 84 is connected to the air chamber 97 when OFF (not energized), and the valve device 82 is connected to the air chamber 97 via the valve device 84 when ON (energized). The valve device 86 is OFF and connected to the air chamber 98. The valve devices 82, 84, and 86 operate by receiving a signal voltage from the control device 7, thereby applying air pressure to the air chamber 97 and / or the air chamber 98 and / or releasing the application. ing.

  The holding body 89 is rotatably held by the holding body main body 101 via the bearing 102 attached to the holding body main body 101, the holding body main body 101 to which the external tip of the piston rod 88 is fixed, and the bearing 102. And a rotating body 103 to which the upper end of the rod 65 is attached. The rotating body 103, the rod 65, and the cutter block 90 have a hole 104 for supplying cutter oil to the abutting portion between the cutter hole 4 and the glass plate 2 when the cutter wheel 4 forms a cut line with respect to the glass plate 2. Is formed.

  The operation of elastically pressing the cutter wheel 4 against the glass plate 2 with the weak elastic pressing force of the elastic pressing force of the cutter wheel 4 against the glass plate 2 by the elastic pressing device 6 is as follows. The valve device 82 applies air pressure from the electro-pneumatic regulator 81 to the valve device 84 in the OFF state via the valve device 82, and electricity is supplied through the valve device 84 in the OFF state (non-energized state). -The low pressure of the air pressure regulator 81 is applied to the air chamber 97 of the air cylinder device 87, and the cutter wheel 4 is pressed against the glass plate 2 through the holding body 89, the rod 65, etc. with this low pressure. On the other hand, the strong pressure of the electro-pneumatic regulator 83 is applied to the valve device 84 in the OFF state, but is closed by the valve device 84. Further, the air pressure from the regulator 85 for raising the cutter wheel 4 is applied to the valve device 86 in the OFF state, but is closed by the valve device 86 and communicates with the air chamber 98 of the air cylinder device 87. Absent. In this way, the cutter wheel 4 presses the glass plate 2 with a low pressure. In the initial stage, the operation of lowering the cutter wheel 4 to contact the glass plate 2 by the elastic pressing device 6 is the same as described above. Further, the weak elastic pressing force is a pressing force corresponding to the pressing force when cutting a straight line portion (making a cutting line).

  The operation of elastically pressing the cutter wheel 4 against the glass plate 2 with the strong elastic pressing force of the strength of the elastic pressing force against the glass plate 2 of the cutter wheel 4 by the elastic pressing device 6 is as follows. While the valve device 82 remains in the ON state, the valve device 84 changes to the ON state, and the weak pressure from the valve device 82 is closed by the valve device 84. Instead, the strong pressure from the electro-pneumatic regulator 83 is applied to the valve device 84. The cutter wheel 4 is pressed against the glass plate 2 with a strong elastic pressing force by being provided to the air chamber 97 of the air cylinder device 87 through 84. Also at this time, of course, the valve device 86 is in the OFF state, the air pressure is stopped from the regulator 85, and it does not communicate with the air chamber 98 of the air cylinder device 87. In addition, the said strong elastic pressing force is a pressing force corresponded to the pressing force at the time of cutting | disconnecting a small round part conventionally.

  The switching of the strength of the elastic pressing force during cutting is performed by switching the valve device 84 on and off. Of course, ON / OFF switching of the valve device 84 is performed by a signal voltage from the control device 7 at a constant time interval (30 ms to 70 ms). The valve device 84 is returned to the OFF state, and the high pressure circuit leading from the electro-pneumatic regulator 83 to the air cylinder device 87 is closed in the valve device 84, and instead, the air chamber 97 of the air cylinder device 87 is passed through the valve device 84. And through the valve device 82, the valve device 82 is turned off, and the air chamber 97 of the air cylinder device 87 is discharged into the atmosphere. At the same time, the weak pressure from the electro-pneumatic regulator 81 is closed by the valve device 82. At the same time, with the valve device 86 as an ON device, air pressure for raising the cylinder from the regulator 85 is opened in the valve device 86 and applied to the air chamber 98 of the air cylinder device 87. Then, with the air pressure from the regulator 85, the cutter wheel 4 rises through the holding body 89 and the rod 65 and leaves the glass plate 2.

  The control device 7 is variously set with respect to the cutting line 3a, the switching of the strength of the elastic pressing force by the elastic pressing device 6 and the movement of the cutter wheel 4 by the moving means 5 by operating the operation panel 111. On the basis of this, the elastic pressing device 6 and the moving means 5 are embodied by a computer 112 that gives electrical signals relating to control. The control device 7 may be configured to CNC control the elastic pressing device 6 and the moving means 5. Such a control device 7 is configured to control the operations described above and below.

  Hereinafter, the operation | movement regarding formation of the cut line 3 with respect to the glass plate 2 by the glass plate cutting machine 1 of this example is demonstrated in detail. First, by placing the glass plate 2 on which the cut line 3 is to be formed on the scratch-proof sheet 12, the support plate 8 supports the glass plate 2. Next, the X-Y direction moving device 21 moves the cutter wheel 4 to the upper side of the preset cut line formation start position with respect to the glass plate 2 supported by the support base 8, and moves the XY plane coordinates. The cutter wheel 4 is oriented in the cut line forming direction by the rotating device (angle control device) 22, and the cutter wheel 4 is moved by the elastic pressing device 6 to above the cut line forming start position and oriented in the cut line forming direction. Further, by applying the air pressure from the electro-pneumatic regulator 81 to the air chamber 97, a weak elastic pressing force (for straight line cutting) directed downward toward the glass plate 2 is applied, and thus the cutter wheel 4 is moved to Z. The glass plate 2 is lowered in the direction, brought into contact with the upper surface 2a of the glass plate 2, and the glass plate 2 is elastically pressed with the elastic pressing force. In this example, the cut line formation start position is the straight line portion 15 of the cut lines 3a to be formed in advance set for the glass plate 2.

  The cutter wheel 4 that elastically presses the glass plate 2 at the cut line formation start position is moved in the XY plane coordinates by the XY direction moving device 21 as shown in FIG. Is moved along. The cutter wheel 4 thus moved rolls on the glass plate 2. In the movement of the cutter wheel 4, the valve device 84 repeats “ON” and “OFF” at regular time intervals, and the weak pressure of the electro-pneumatic regulator 81 and the strong pressure of the electro-pneumatic regulator 83 are elastic. The air pressure is applied alternately to the air chambers 97 of the air cylinder device 87 serving as the pressing device 6, and the cutter wheel 4 is pressed while being alternately switched as the strength of the elastic pressing force. The constant time interval for switching the strength of the elastic pressing force by the elastic pressing device 6 may be set in the range of 30 ms to 70 ms, for example, 50 ms. As described above, the cutter wheel 4 is pulsatingly pressed against the glass plate 2 by the moving means 5 and the elastic pressing device 6 to deepen and clean new (breaks) in the glass plate 2 along the straight line portion 15. The cut line 3 is formed while proceeding.

  When the cutting line 3 is formed on the glass plate 2 along the rounded portion 16 of the cutting line 3a by the cutter wheel 4, as shown in FIG. The cutter 22 is moved along the rounded portion 16 while moving and rotating the XY plane coordinates by the moving device 22 and the strength of the elastic pressing force is intermittently increased at certain time intervals by the elastic pressing device 6. The cutter wheel 4 is elastically pressed while switching alternately. Here, the moving speed when the cutter wheel 4 is moved along the rounded portion 16 of the corner portion 17 of the glass plate 2 by the XY direction moving device 21 is linearly moved by the XY direction moving device 21. The moving speed along the portion 15 is lower than the moving speed. For this reason, in the radius portion, switching of the strength of the pressing force is dense with respect to the moving distance of the cutter wheel 4, and the strong pressing force is reduced. A cutting line is inserted with the percentage increased. For this reason, the new insertion in the rounded portion can be inserted deeper and more beautifully. In this way, when the glass plate 2 on which the cut line 3 is formed is folded along the cut line 3, the folded surface becomes a clean surface free from cracks.

  According to the glass plate cutting machine 1 of the present example, the cutter wheel 4 that forms the cut line 3 on the glass plate 2, and the cut line 3 a that is to be formed in advance with respect to the glass plate 2. Moving means 5 for moving, elastic pressing device 6 for elastically pressing the cutter wheel 4 against the glass plate 2, and elastic pressing force of the cutter wheel 4 against the glass plate 2 in the movement of the cutter wheel 4 by the moving means 5 And the control device 7 for controlling the elastic pressing device 6 so as to alternately switch the strength and the strength of the cutting line 3 that has advanced deeply, uniformly and cleanly into the glass plate 2. Can be formed.

DESCRIPTION OF SYMBOLS 1 Glass plate cutting machine 2 Glass plate 3, 3a Cut line 4 Cutter wheel 5 Moving means 6 Elastic pressing device 7 Control device

Claims (8)

The cutting edge is moved along the cut line to be formed which is set in advance for the glass plate, elastically pressed during this movement, the Switching Operation edge by Erareru pneumatically switched alternately strength to the glass plate And the glass plate cutting method which forms a cutting line in a glass plate. The glass plate cutting method according to claim 1, wherein the air pressure is alternately switched at regular intervals. The glass plate cutting method according to claim 1 or 2, wherein the air pressure is alternately switched at intervals of 30 ms to 70 ms. A cutting blade for forming a cutting line on the glass plate, a moving means for moving the cutting blade along a cutting line to be formed in advance with respect to the glass plate, and the cutting blade with respect to the glass plate by air pressure An elastic pressing device that elastically presses, and a control device that controls the elastic pressing device so as to elastically press the cutting blade against the glass plate by air pressure that is alternately switched in strength when moving the cutting blade by the moving means; The moving means is a glass plate cutting machine configured such that the moving speed of the cutting blade that moves the round portion is lower than the moving speed of the cutting blade that moves the linear portion. The control device controls the elastic pressing device so that the time interval for alternately switching the strength of the air pressure in the round portion is shorter than the time interval for alternately switching the strength of the air pressure in the straight portion. The glass plate cutting machine described in 1. A cutting blade for forming a cutting line on the glass plate, a moving means for moving the cutting blade along a cutting line to be formed in advance with respect to the glass plate, and the cutting blade with respect to the glass plate by air pressure An elastic pressing device that elastically presses, and a control device that controls the elastic pressing device so as to elastically press the cutting blade against the glass plate by air pressure that is alternately switched in strength when moving the cutting blade by the moving means; And the control device controls the elastic pressing device so that the time interval for alternately switching the strength of air pressure in the rounded portion is shorter than the time interval for alternately switching the strength of air pressure in the straight portion. Glass plate cutting machine. The glass plate cutting according to any one of claims 4 to 6, wherein the control device controls the elastic pressing device so as to cause the air pressure intensity to be alternately switched at regular time intervals. Machine. The glass according to any one of claims 4 to 7, wherein the control device controls the elastic pressing device so that the air pressure is alternately switched at intervals of 30 ms to 70 ms. Board cutting machine.

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