JPH0569301A - Method and device for cutting corner of plate glass - Google Patents

Abstract

PURPOSE:To eliminate over grinding of corner parts of a plate glass even in the case where the carrying speed of the plate glass is speeded up, and prevent the generation of crack of the plate glass. CONSTITUTION:A grinding wheel carrying base 38 is provided with a grinding means 12 for grinding corner parts of a substrate 22 for liquid crystal with a grinding wheel 24, and the grinding wheel carrying base 38 is moved in parallel with the carrying direction by a grinding wheel carrying means 14. A detecting means 16 detects the carried substrate 22 for liquid crystal to output the detecting signal. A control unit 18 controls the grinding wheel carrying means 14 on the basis of the output detecting signal so that the grinding means 12 is moved at the same speed with the carrying speed of the substrate 22 for liquid crystal. Consequently, when the substrate 22 for liquid crystal is positioned at a position for grinding a corner part, the grinding wheel 24 of the grinding means 12 is moved at the same speed with the carrying speed of the substrate 22 for liquid crystal. Under this condition, the grinding wheel 24 is moved in the grinding direction to grind the corner part of the substrate 22 for liquid crystal.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a liquid crystal substrate, a furniture mirror,
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet glass corner cutting method and apparatus for grinding a corner portion of a sheet glass such as architectural glass.

[0002]

2. Description of the Related Art Types of liquid crystal substrates are identified by the shape of a corner cut formed in a corner portion of the liquid crystal substrate. Then, the corner cutting of the liquid crystal substrate is performed by cutting the corner portion of the liquid crystal substrate being transported with a disc-shaped grindstone disposed on the side of the transport line. Two methods are generally known for this corner cutting method.

In the first method, when the liquid crystal substrate being conveyed is conveyed to a predetermined position, the disc-shaped grindstones provided on both sides of the conveying line are moved in a direction orthogonal to the traveling direction of the liquid crystal substrate. Moving. As a result, the corner portion of the liquid crystal substrate is cut. In the second method, a positioning member is connected to a disk-shaped grindstone movably provided on both sides of the transfer line, and the liquid crystal substrate that has been transferred is brought into contact with the positioning member. As a result, the disk-shaped grindstone moves together with the liquid crystal substrate. In this state, the disk-shaped grindstone is moved diagonally to cut the corner portion of the liquid crystal substrate.

[0004]

However, in the first method, when the transport speed of the liquid crystal substrate is increased, the moving speed of the discoid grindstone is increased. That is, since the grinding feed rate is increased, heavy grinding occurs, which causes chipping of the glass, chipping, and cracking. Therefore, for example, when cutting the front corner of the liquid crystal substrate, there is a problem that heavy grinding is performed and the concave corner is cut.

On the other hand, in the second method, the liquid crystal substrate that has been conveyed is brought into contact with the positioning member to move the disk-shaped grindstone together with the liquid crystal substrate. Therefore, if the liquid crystal substrate is conveyed at a high speed, it will come into contact with the positioning member. There is a problem that cracks occur at the contact area. The present invention has been made in view of such circumstances, and it is possible to linearly cut the corner portion of the liquid crystal substrate even when the transport speed of the liquid crystal substrate is increased. An object of the present invention is to provide a sheet glass corner cutting method and apparatus capable of preventing the generation thereof.

[0006]

In order to achieve the above-mentioned object, the present invention is directed to a corner portion of a plate glass by moving a disk-shaped grindstone provided on a side of a transfer line for transferring the plate glass while rotating. In the plate glass corner cutting device for grinding
Having the disk-shaped grindstone, moving the grindstone in the direction of grinding the corner portion of the plate glass, a grinding means for grinding the corner portion of the plate glass, and the grinding means,
A grindstone carrier that moves in parallel with the conveying direction of the plate glass together with the grinding means, a grindstone conveyor that moves the grindstone carrier independently of the plate glass in parallel with the conveying direction of the plate glass, and the plate glass being conveyed. A detection unit that detects a transport speed and outputs a detection signal, and a control unit that controls the grindstone transport unit so that the grindstone transport base moves at the same speed as the plate glass based on the output detection signal, And a grindstone member of the grinding means cuts a corner portion of the plate glass when the grinding means and the plate glass move at the same speed.

[0007]

According to the present invention, the grindstone carrier is provided with the grinding means for grinding the corner portion of the plate glass with the disk-shaped grindstone, and the grindstone carrier is moved by the grindstone carrier means in parallel with the conveying direction of the plate glass. Further, the detection means detects the glass sheet being conveyed and outputs a detection signal. Then, the control unit controls the grindstone transfer means based on the output detection signal so that the grindstone transfer base moves at the same speed as the plate glass transfer speed.

Therefore, when the plate glass reaches the position for cutting the corner portion, the grindstone of the grinding means moves at the same speed as the plate glass conveying speed. In this state, the grindstone moves in the grinding direction to cut the corner portion of the plate glass.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A preferred embodiment of a method and apparatus for corner cutting of sheet glass according to the present invention will be described below with reference to the accompanying drawings. 1 is a plan view of a sheet glass corner cutting device 10 according to the present invention, FIG. 2 is a view taken along the line AA of FIG. 1, and FIG. Sheet glass corner cutting device 10
Is mainly a grinding means 12, a whetstone conveying means 14, a detection means 16
And the control unit 18, and the grinding devices 12A, 12B, 12C and 12D of the grinding means 12 are the conveying line 2
Two are provided on each side of 0. Transport line 2
0 is the upper and lower conveyor belts 20A, 20 for the liquid crystal substrate 22.
It is carried by being sandwiched by A, 20B, and 20B (see FIG. 2).

Grinding devices 12A, 12B, 12C, 12D
Are configured of substantially the same member, the grinding device 12A will be described, and the other grinding devices 12B, 12C, 12 will be described.
For D, only the differences will be described. The grinding device 12A has a disk-shaped grindstone 24 shown in FIG. 2, and the grindstone 24 is coaxially fixed to a drive shaft of a spindle motor 26. The spindle motor 26 is attached to the end portion of the cut moving table 30 shown in FIG. The cut moving table 30 is movably provided on the rotary table 32 via the guide portions 30A and 30A and the rail portions 32A and 32A.

A piston rod 34A of an air cylinder 34 is attached to the cut moving table 30, and a cylinder portion 34B of the air cylinder 34 is attached to the rotating table 32. Therefore, when the air cylinder 34 expands and contracts, the grindstone 24 moves in the arrow direction (that is, the direction intersecting the transfer line 20 in a state of being inclined with respect to the transfer line 20) via the cut moving table 30 and the like.

A rotating means (not shown) is provided between the rotating table 32 and the adjustment moving table 36. This rotating means uses a servomotor or a stepping motor as a drive system, and when the drive system operates, the rotating table 32 rotates in the clockwise direction or the counterclockwise direction around the center thereof. As a result, the direction in which the grindstone 24 moves can be changed by the expansion and contraction of the air cylinder 34.

The adjustment movable table 36 includes guide portions 36A and 36A.
, And a rail portion 38A, 38A, and is provided movably on a grindstone carrier 38 of a grindstone carrier means 14 described later. The rail portions 38A and 38A are arranged parallel to the transport line 20. Servo motor 40 is provided on grindstone carrier 38.
Is attached to the drive shaft 40 of the servomotor 40.
A ball screw (not shown) is formed on A. A ball screw of a drive shaft 40A is screwed to the adjustment moving base 36. Therefore, when the servo motor 40 is driven, the adjustment moving table 36 moves along the transfer line 20,
The grindstone 24 can be positioned at a predetermined position along the transfer line 20.

Although the grinding device 12A of the grinding means 12 has been described above, the grinding motors 12B and 12C are not provided with the servo motor 40 and the adjustment moving table 36. A block 37 is fixed to the grindstone carrier 38 as a substitute for the adjustment moving base 36 in the grinding devices 12B and 12C, and the rotating means (not shown) is provided between the block 37 and the rotating base 32. Is provided.

The grindstone carrier 38 of the grindstone carrier means 14 is movably provided on the main body 42 via guide parts 38B, 38B ... And rail parts 42A, 42A. Rail part 4
2A and 42A are arranged parallel to the transport line 20. A servo motor 44 is provided at one end of the main body 42, and a pulley 46 is coaxially fixed to the drive shaft of the servo motor 44.

A pulley 48 is rotatably supported on the other end of the main body 42, and a pulley 46 and a pulley 48 are stretched with a tamping belt 50. The taming belt 50 has a whetstone carrier. 38 is attached. Therefore, when the servomotor 44 is driven, the grindstone 24 moves in parallel along the transfer line 20 via the grindstone transfer table 38 and the like. The constituent members of the grindstone transfer means 14 are arranged on both sides of the transfer line 20 as shown in FIG.

As shown in FIG. 1, the detecting means 16 is provided at a substantially central portion of the transfer line 20. The detection means 16 includes a detection moving base 52 shown in FIG. Detection mobile table 52
Are guide parts 52A, 52A ... and rail parts 54A, 54
It is movably provided on the fixed base 54 via A, and the fixed base 54 is fixed to the transfer line 20. Fixed stand 5
A displacement sensor 56 is attached to the position 4.

On the other hand, a protruding piece 56A is fixed to the detection moving base 52. The protruding piece 56A is a displacement sensor 56 when the detection moving base 52 moves along the rail portions 54A, 54A.
It is positioned so as to abut A. Projecting piece 56A
A predetermined pressure is applied in advance by a compression spring fixed to the stopper 58, an air cylinder 58A, or the like to determine the initial position of the protruding piece. When the protruding piece 56A comes into contact with the displacement sensor 56 and a predetermined pressure is applied to the displacement sensor 56, the displacement sensor 56 outputs a signal.

A block 60 is fixed to the left end of the detection moving base 52, and the height of the block 60 is set to be lower than that of the liquid crystal substrate 22 conveyed on the conveyance line 20. A positioning member 64 is rotatably supported on the block 60 around a pin 62. When the positioning member 64 is held in the state shown in FIG. 4, the positioning member 64 abuts on the liquid crystal substrate 22 conveyed on the conveyance line 20, and the detection moving base 52 is moved.
Moves at the same speed as the liquid crystal substrate 22, presses the displacement sensor 56 by the protruding piece 56A attached thereto, and outputs a signal.

A lever 66 is fixed to the pin 62, a piston rod portion 68A of an air cylinder 68 is brought into contact with the lever 66, and the cylinder portion 6 is attached to the detection moving base 52.
8B is attached. Therefore, the air cylinder 68
When is expanded and contracted, the positioning member 64 is rotated. When the positioning member 64 rotates and falls down, the contact between the liquid crystal substrate 22 and the positioning member 64 is released, and the liquid crystal substrate 22 is transported on the transport line 20. Further, the displacement sensor 56 includes a compression spring 58A in which the protruding piece 56A is fixed to the stopper 58.
The output of the displacement sensor 56 disappears and the initial state is reached.

The control section 18 has a CPU 70 and a positioning unit 72. The CPU 70 receives the detection signal output from the displacement sensor 56 via the amplifier 74, and outputs the transfer speed of the grindstone transfer table 38 based on the detection signal so as to synchronize with the liquid crystal substrate 22 being transferred. The positioning unit 72 moves the grindstone carrier 38 to the servomotor 44 of the grindstone carrier 14 via the servo amplifier 76 based on the speed signal output from the CPU 70 at the same speed as the carrier speed of the liquid crystal substrate 22. Signal (sync signal)
Is output. Thereby, the grindstones 24, 24, 24, 24
Moves in synchronization with the transport speed of the liquid crystal substrate 22.

Further, as shown in FIG. 1, a positioning means 82 is provided in the conveying line 80 on the upstream side of the sheet glass corner cutting device 10. The positioning means 82 has a belt 84 rotatably provided below the transport line 80, and the belt 84 is arranged parallel to the transport line 80. Further, the positioning means 82 has a pressing means 86 provided on the upper side of the transport line 80. Therefore,
The liquid crystal substrate 22 conveyed to the conveying line 80 is pressed against the belt 84 by the pressing means 86 and positioned on the reference side shown in FIG. Incidentally, reference numeral 90 in FIG. 1 denotes a servo motor for driving the carrying line 20 and the carrying line 80.

The operation of the sheet glass corner cutting device configured as described above will be described with reference to FIGS. First, the grinding devices 12A, 12B, 12C and 12D of the grinding means 12 are set on the basis of the corner cut angle, length and width of the liquid crystal substrate 22 to be processed. That is,
The liquid crystal substrate 22 for processing the moving direction of the grindstone 24 by operating the rotating means of each of the grinding devices 12A, 12B, 12C and 12D to rotate the rotating table 32 in the clockwise direction or the counterclockwise direction. Match the corner cut angle of. Then, the servomotor 40 is driven to move the grindstone 24 through the adjustment moving table 36 and the like so as to match the length of the liquid crystal substrate 22.

Further, by operating a grindstone conveying means (not shown), the upper main body 42 (see FIG. 3) in FIG.
By moving in a direction orthogonal to 0, the grindstone 24 is adapted to the width dimension of the liquid crystal substrate 22. Next, the grinding device 12
The air cylinders 34, 34 of A and 12D are contracted, and the air cylinders 3 of the grinding devices 12B, 12C are also contracted.
Extend 4,34. Therefore, each grindstone 24, 2
4, 24 and 24 are arranged at the positions shown in FIG.

Next, the servo motors 90, 90 and the like are driven to operate the transfer line 20, the transfer line 80 and the like to transfer the liquid crystal substrates 22, 22 ... Then, the liquid crystal substrate 22
Is conveyed to the conveyance line 80, the liquid crystal substrate 22 is pressed against the belt 84 by the pressing means 86 and positioned on the reference side shown in FIG. The positioned liquid crystal substrate 22 is transported to the transport line 20 (see the position of the liquid crystal substrate 22 in FIG. 5A).

In this state, the liquid crystal substrate 22 is moved to the transfer line 2
0 upper and lower conveyor belts 20A, 20A, 20B, 20B
It is conveyed by being sandwiched by (see FIG. 2). When it comes into contact with the positioning member 64 of the detection means 16, the detection movable base 52
Moves along the rail portions 54A and 54A. Next, the protruding piece 56A of the detection moving base 52 contacts the displacement sensor 56 and a predetermined pressure is applied to the displacement sensor 56 (see FIG. 5B). As a result, the displacement sensor 56 outputs a signal. When the signal is output, the air cylinder 68 of the detection means 16 extends to rotate and position the positioning member 64. Therefore, the contact between the liquid crystal substrate 22 and the positioning member 64 is released, and the liquid crystal substrate 22 is transported on the transport line 20.

On the other hand, the output signal is input to the CPU 70 via the amplifier 74. Based on this detection signal, the CPU 70 conveys the liquid crystal substrate 22 at the conveying speed and the grindstone conveying table 38.
The positioning unit 72 that outputs the transfer speed of the grindstone transfer table 38 outputs a signal to the servo motor 44 of the grindstone transfer means 14 via the servo amplifier 76, based on the speed signal output from the CPU 70, so that they are synchronized with each other. ..

As a result, the servomotors 44, 44 are driven to move the grindstone carriages 38, 38 in synchronism with the carriage speed of the liquid crystal substrate 22, so that the grinding machines 12A, 12B,
The grindstones 24, 24, 24, 24 of 12C and 12D move in synchronization with the transport speed of the liquid crystal substrate 22 (FIG. 5).
(See (B)). Next, the air cylinders 34, 34 of the grinding devices 12A, 12D are extended and the grinding device 1
The air cylinders 34, 34 of 2B, 12C are contracted. Therefore, the respective grindstones 24, 24, 24, 24 move in the arrow directions shown in FIG. As a result, the liquid crystal substrate 22 is corner-cut in a predetermined shape.

In the above embodiment, the rotating means of the grinding means 12,
Although the servo motor 40 and the grindstone transfer means (not shown) are manually operated to correspond to the corner cut angle, length dimension and width dimension of the liquid crystal substrate 22, the corner cut angle of the liquid crystal substrate 22 is not limited to this. The length dimension and the width dimension are input to the CPU 70 as data for each product type, and when the product type of the liquid crystal substrate 22 to be processed is changed, the rotating means of the grinding means 12, the servo motor 40, and a grindstone conveying means (not shown) are used. The angle of the corner cut of the liquid crystal substrate 22
It may correspond to the length dimension and the width dimension.

In the above embodiment, the air cylinder 34 was operated to move the grindstone 24 in the corner cutting direction, but the present invention is not limited to this, and a servo motor, a stepping motor or the like may be used. Further, in practice, depending on the specifications of the liquid crystal substrate, a part of the grindstones 24 is often specified such as three or two of the four. In the above-mentioned embodiment, the adjustment movable table 36 is positioned by the servo motor 40, but the present invention is not limited to this, and other driving system such as a stepping motor may be used.

Although the corner cutting of the liquid crystal substrate 22 has been described in the above embodiment, the present invention is not limited to this, and the invention can be applied to other plate glass such as a furniture mirror.

[0032]

As described above, according to the corner cutting method and apparatus for plate glass of the present invention, when the plate glass is conveyed to the position for grinding the corner portion, the grindstone of the grinding means has an independent drive system. Then, it is driven and moves at the same speed as the sheet glass conveyance speed. Then, in this state, the grindstone moves in the grinding direction to cut the corner portion of the plate glass.

Therefore, even when the conveying speed of the plate glass is increased, it is possible to cut without cutting the heavy grinding of the corner portion of the plate glass, and further it is possible to prevent the plate glass from cracking.

[Brief description of drawings]

FIG. 1 is a plan view of a sheet glass corner cutting device according to the present invention.

FIG. 2 is a view on arrow AA of FIG.

FIG. 3 is an enlarged view of a main part of a sheet glass corner cutting device according to the present invention.

FIG. 4 is a perspective view of the detecting means 16 of the sheet glass corner cutting device according to the present invention.

5 (A) and 5 (B) are explanatory views showing an operating state of the corner cutting device for plate glass according to the present invention.

FIG. 6 is an explanatory view showing an operating state of a sheet glass corner cutting device according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Plate glass corner cutting device 12 ... Grinding means 14 ... Grinding wheel conveying means 16 ... Detecting means 18 ... Control section 20 ... Conveying line 22 ... Liquid crystal substrate (plate glass) 24 ... Grinding stone 38 ... Grinding stone carrier

Claims (2)

[Claims] 1. A method for cutting corners of a plate glass, wherein a disk-shaped grindstone disposed on a side of a transfer line for transferring the plate glass is moved in a rotating state to grind a corner portion of the plate glass. However, the grindstone carrier is moved in the plate glass transport direction independently of the plate glass to eliminate the difference in transport speed between the grindstone carrier and the plate glass. A method of cutting a corner of a plate glass, the method comprising moving the plate glass to a corner direction and grinding the corner portion of the plate glass. 2. A plate glass corner cutting apparatus for grinding a corner portion of a plate glass by moving a disk-shaped grindstone provided on a side of a conveying line for conveying the plate glass in a rotating state. Having the grinding means for moving the grindstone in the direction of grinding the corner portion of the plate glass and grinding the corner portion of the plate glass, and the grinding means, and moving in parallel with the conveying direction of the plate glass together with the grinding means. A grindstone carrier, a grindstone carrier that moves the grindstone carrier independently of the plate glass parallel to the direction of transport of the plate glass, and a detection unit that detects the carrier speed of the plate glass being conveyed and outputs a detection signal. And a control unit that controls the grindstone conveying means so that the grindstone conveying base moves at the same speed as the plate glass on the basis of the output detection signal. A plate glass corner cutting device, wherein a grindstone member of the grinding means cuts a corner portion of the plate glass when the plate glass and the plate glass move at the same speed.