KR20060013745A - In-line system for cutting of glass - Google Patents

Abstract

The present invention relates to a glass in-line cutting system, and more particularly, in a cutting device for cutting glass (particularly, FPD (plate panel display)) to a certain size, by cutting the cutter in multiple rows to be cut. At the same time, when cutting, the double glass is cut at once while supplying cutting water, thereby shortening the working time, preventing the generation of step difference and breakage caused by the cutting of the double glass, and the occurrence of defects caused by static electricity. Position adjustment cutting cleaning The cleaning in-line alignment process is performed automatically in a single line, to a glass in-line cutting system to maximize the space utilization and workability of the installation of the device.

To this end, the present invention provides a glass cutting device comprising: a robot transporting device for loading a glass arranged in a cassette and transferring the glass onto a work plate, and adjusting a position of a glass-mounted work plate through an image input of a camera to an accurate position. A first conveying unit including a position adjusting device for adjusting; A second transfer part including a work plate having a plurality of through holes and glass cutting grooves communicated by vacuum suction by a separate back device, and a power generating device for supplying power so that the work plate is transported along a transport path; A rotary cutter for cutting the glass seated on the moving work plate, a fixed shaft in which a plurality of rotary cutters are inserted to maintain a predetermined gap, a motor coupled to one end of the fixed shaft to supply rotational power, and a motor. And a cutting portion including a bearing provided so that the fixed shaft end of the other side is rotatably supported; A cutting water spraying part including a cutting water spraying rod for spraying the cutting water supplied by forming a through hole at a predetermined angle in front of the rotary cutter of the cutting portion, and a cutting plate for enclosing the cutting water spraying rod and the rotating cutter portion of the cutting portion; ; A primary cleaning unit including a cleaning liquid spraying device 1 configured to spray the cleaning liquid onto the surface of the cut glass, and an air spraying unit for injecting air to dry the cleaning liquid on the glass surface; A third transporting unit including a robot transporting device for loading the cleaned / dried glass from the work plate, and a transporting roller transporting the cut glass supplied from the robot transporting device by the rotational power of the motor; A cleaning liquid spraying device 2 installed on the conveying roller of the third conveying part to spray the cleaning liquid to clean the surface of the glass, a brush washing device to rotate to remove foreign substances on the glass surface, and a cleaning liquid to spray the surface of the glass. A secondary cleaning and drying unit including a cleaning liquid spraying device 3 and an air drying device for injecting air to remove moisture from the glass surface; A carrying out portion for carrying out the glass to the alignment portion through the conveyor apparatus; And a glass housing / alignment unit configured to move up and down by a power transmission device so as to store / align the glass carried out on the conveyor.

Glass, Cutting Device

Description

In-line system for cutting of glass}

1A to 1F are cross-sectional views showing a conventional glass cutting state.

Figure 2 is a block diagram schematically showing the system configuration of the present invention

Figure 3 illustrates in more detail the system configuration of the present invention

       System alignment

Figure 4 is a cross-sectional view showing the configuration of the cutting unit in the present invention

Figure 5 a, b is a configuration of the cutting portion and the cutting water injection portion of the present invention and

       Perspective view showing operating condition

6 is a sequence block diagram illustrating the operation steps of the present invention in order.

<Description of Signs of Major Parts of Drawings>

100: cutting system 110: first transfer unit

111,161: Robot feeder 112: Position adjuster

120: second transfer unit 121: work plate

122: transfer path 123: power generating device

130: cutting portion 131: rotary cutter

132: fixed shaft 133: rotating shaft

134: motor 135: bearing

136: spacing area 140: cutting water injection unit

141: water jet rod 142: blocking plate

150: 1st washing machine 151,171,173: cleaning liquid injection device 1,2,3

160: third transfer unit 162: feed roller

170: secondary cleaning and drying unit 172: brush cleaning device

174: air drying apparatus 180: carrying out

181: conveyor apparatus 190: glass storage / alignment unit

191: power generating device 192: power transmission device

193: support plate C: cassette

G: disc glass G ': cut glass

The present invention relates to a glass in-line cutting system, and more particularly, in a cutting device for cutting glass (particularly, FPD (plate panel display)) to a certain size, by cutting the cutter in multiple rows to be cut. At the same time, when cutting, the double glass is cut at once while supplying cutting water, thereby shortening the working time, preventing the generation of step difference and breakage caused by the cutting of the double glass, and the occurrence of defects caused by static electricity. Position adjustment cutting cleaning The cleaning in-line alignment process is performed automatically in a single line, to a glass in-line cutting system to maximize the space utilization and workability of the installation of the device.

In general, a cutting device designed to cut glass (particularly, FPD (plate panel display)) to a certain size is mostly applied to a dry cutting structure and method using a diamond wheel, as shown in FIG. 1. do.

That is, drawing a line using a diamond wheel on one surface of the double glass; Flipping the glass and hitting the glass surface of the other side not drawn; Causing the lined glass to be cracked along the line by the striking; Drawing a line on the surface of the uncut glass; Flipping the glass over to hit the cut glass surface; The blown glass may be broken along the line.

As can be seen from the above, the conventional glass cutting method has to go through a very complicated step several times only in the cutting step, and the apparatus for this is also very complicated.

In addition, since it is a method to cut the line by hitting the line on the glass surface, there is a problem that the defect rate is high, such as the unbalance of the glass size due to the breakage of the glass due to the strike and the inconsistency of the crack formed in the double glass.

In addition, there is a problem that the static electricity failure rate is increased according to the generation of a corrector by friction between the glass surface and the diamond wheel.

The present invention created in consideration of the above problems, in the cutting device to cut the glass, in particular FPD (plate panel display) to a certain size, by cutting the cut at the same time by installing the cutter in multiple rows By cutting the double glass at a time while supplying the cutting water, the working time can be shortened, while preventing the generation of the step by the cutting of the double glass and the occurrence of breakage due to static electricity, and cutting the glass supply position adjustment. It is a technical challenge to provide a glass in-line cutting system designed to maximize the space utilization and workability of the installation of the apparatus by having the process of cleaning dry take-out alignment done automatically in one line.

In the present invention for achieving the above object, in the glass cutting device, the robot transfer device for loading the glass arranged in the cassette and transported onto the working plate, and adjusts the position of the glass-mounted working plate through the image input of the camera A first transfer unit including a position adjusting device for adjusting the position to an accurate position; A second transfer part including a work plate having a plurality of through holes and glass cutting grooves communicated by vacuum suction by a separate back device, and a power generating device for supplying power so that the work plate is transported along a transport path; A rotary cutter for cutting the glass seated on the moving work plate, a fixed shaft in which a plurality of rotary cutters are inserted to maintain a predetermined gap, a motor coupled to one end of the fixed shaft to supply rotational power, and a motor. And a cutting portion including a bearing provided so that the fixed shaft end of the other side is rotatably supported; A cutting water spraying part including a cutting water spraying rod for spraying the cutting water supplied by forming a through hole at a predetermined angle in front of the rotary cutter of the cutting portion, and a cutting plate for enclosing the cutting water spraying rod and the rotating cutter portion of the cutting portion; ; A primary cleaning unit including a cleaning liquid spraying device 1 configured to spray the cleaning liquid onto the surface of the cut glass, and an air spraying unit for injecting air to dry the cleaning liquid on the glass surface; A third transporting unit including a robot transporting device for loading the cleaned / dried glass from the work plate, and a transporting roller transporting the cut glass supplied from the robot transporting device by the rotational power of the motor; A cleaning liquid spraying device 2 installed on the conveying roller of the third conveying part to spray the cleaning liquid to clean the surface of the glass, a brush washing device to rotate to remove foreign substances on the glass surface, and a cleaning liquid to spray the surface of the glass. A secondary cleaning and drying unit including a cleaning liquid spraying device 3 and an air drying device for injecting air to remove moisture from the glass surface; A carrying out portion for carrying out the glass to the alignment portion through the conveyor apparatus; And a glass housing / alignment unit configured to move up and down by a power transmission device so as to store / align the glass carried out on the conveyor.

2 is a block diagram schematically showing a system configuration of the present invention, FIG. 3 is a system arrangement diagram more specifically showing a system configuration of the present invention, and FIG. Figure 5 is a cross-sectional view showing the configuration of the cutting portion, a, b of Figure 5 is a perspective view showing the configuration and operating state of the cutting portion and the cutting water injection portion of the present invention, Figure 6 shows the operation steps of the present invention in order As an ordered block diagram, double reference numeral 100 denotes a cutting system of the present invention.

2 and 3 of the present invention, in the glass cutting device, the robot transporting device 111 for loading the glass (G) aligned on the cassette (C) and transported onto the work plate 121 And a first transfer part 110 including a position adjusting device 112 for adjusting the work plate 121 on which the glass G is seated to the correct position through the glass image input of the camera. A plurality of through holes 121 'and glass cutting grooves 121 ", which are communicated to be sucked under vacuum by a separate back device, are formed in a row, and the work plates 121 are transported through the transfer path 122. A second transfer part 120 including a power generating device 123 for supplying power, a rotary cutter 131 for cutting the glass G seated on the moving work plate 121, and a plurality of rotary cutters The fixed shaft 132 is inserted 131 to maintain a predetermined interval, the rotation shaft 133 is coupled to one end of the fixed shaft 132 to supply the rotational power and the motor 134 A cutting part 130 including a bearing 135 provided so that the end of the fixed shaft 132 on the other side is rotatably supported; and a through hole at a predetermined angle in front of the rotation cutter 131 of the cutting part 130. Cutting water injection rod 141, the cutting water injection rod 141 and the cut to inject the cutting water is formed and supplied A cutting water spraying unit 140 including a blocking plate 142 installed to cover the rotary cutter 131 of the putting unit 130; and a cleaning solution is sprayed onto the surface of the cut glass G 'to be cleaned. A first cleaning unit 150 including a cleaning liquid spraying device 1 151, and an air spraying device 152 for injecting air to dry the cleaning liquid on the glass G 'surface; The robot transporting device 161 for loading G ') from the work plate 121 and the cut glass G' supplied from the robot transporting device 161 are linked while being driven by the rotational power of the motor 162. A third conveying unit (160) including a conveying roller (163) to be disposed on the conveying roller (163) of the third conveying unit (160); 2 (171), the brush cleaning device 172 which rotates and removes the foreign material on the surface of the glass G ', and the table of the glass G'. Second cleaning and drying unit 170 including a cleaning liquid spraying device 3 (173) for spraying the cleaning liquid to clean the surface, and an air drying apparatus (174) for spraying air to remove moisture on the surface of the glass (G '). Wow; A carrying-out unit 180 for carrying out the glass G 'to the aligned position through the conveyor device 181; The glass G 'carried out on the conveyor apparatus 181 is sequentially stacked and inserted between the power generator 191 and the cassette C on the support plate 193 which is lifted and operated by the power transmission apparatus 192. It is composed of a glass housing / alignment unit 190.

The position adjusting device 112 of the first conveying unit 110 is a glass, as shown in the "Applicant Position Correction Device for Transfer for Glass Processing (Patent Application No. 2004-11138)" The position correction tool which consists of the image detection part which consists of cameras 1, 2, 3, 4 which is installed on the conveyance path perpendicular | vertical of an inlet part and detects the square corner of glass, and the correction roller which linearly moves back and forth by a linear servo cylinder When the glass is conveyed to the processing unit through the conveying unit through the primary position correction unit 120, respectively, which is installed in the left and right, front and rear of the conveying part of the glass inlet part so as to correct the position on the Y axis by pushing both sides of the conveyed glass. Secondary position correction unit installed on the left and right sides of the processing unit to correct the position on the Y axis by pushing both sides, and the image input through each camera constituting the image detection unit Program and electrical circuit design to calculate the digital point signal from the arc and compare the preset point value to change the position of the glass by operating the cylinder of the position compensator corresponding to the position and moving the correction roller back and forth. It consists of an image processing unit consisting of.

In addition, the rotary cutter 131 of the cutting unit 130 is a diamond blade having a thickness of 30 ~ 150㎛, and a diameter of about 2 ~ 5 "bonded using a resin adhesive or a metal adhesive, the accompanying drawings Figure 4 and Figure As shown in FIG. 5, a spacing holder 136 is provided between the rotary cutters 131 to maintain each rotary cutter 131 at a predetermined interval.

Further, the cleaning liquid injectors 1, 2, 3 (151) 171 (173), the air spraying device 152, the brush cleaning device 172, and the air drying device 174 are respectively formed on the image of the glass G '. / Installed on the bottom (optionally installed as needed)

The power generator 191 of the glass housing / alignment unit 190 is a motor, the power transmission device 192 is a guide rod installed horizontally with a screw and a screw, and the operation of the power generator 191 is a sensor ( It is made by the detection, it is made to move up and down by the same height as the height of the step of the cassette (C).

Referring to the step-by-step progress state of the present invention configured as described above, as shown in Figure 6, first, when the cassette (C) is located in the retractable position, the robot transfer device 111 of the first transfer unit 110 is cassette (C) the primary transport step (S10) for loading the glass (G) to move to the work plate 121 of the second transfer unit 110; A position correcting step (S20) of correcting the correct position to the correct position after checking through the camera whether the transported glass G is correctly positioned at the position of the work plate 121; When the glass G is positioned at the correct position, the work plate 121 vacuum-adsorbs the glass G, and at the same time, the power generator 123 of the second transfer part operates to ride the work path 122 on the work plate. A second conveyance step (S30) of moving the 121; When the work plate 121 on which the glass G is seated starts to move, the motor 134 of the cutting unit 130 is operated to rotate a plurality of rotary cutters 131 fixed to the fixed shaft 136 to glass. Glass cutting step (S40) for cutting (G); Cutting water spraying rod 141 of the cutting water spraying unit 140 to prevent the generation of heat and static electricity due to friction between the rotating cutter 131 and the glass (G) in the process of cutting the glass (G) by rotating the rotary cutter (131). Cutting water injection step (S50) for injecting cutting water from the; When the glass G is cut and separated into a plurality of pieces, the cleaning liquid spraying device 1 151 of the primary washing unit 150 sprays the cleaning liquid to clean it, and the air spraying device 152 operates to operate the glass G '. The first washing / drying step (S60) for removing the moisture on the surface, and after the completion of the first cleaning, the robot transfer device 161 of the third transfer unit 160 loads the glass (G ') to be transferred in order A third feed step (S70) for moving on the feed roller 162 linked by the feed roller, and when the loading is completed, the power generator 123 reversely operates to return the work plate 121 to its original position; The cleaning liquid spraying device 2 171 of the second cleaning and drying unit 170 is operated on the surface of the glass G 'transported by the conveying roller 162 to spray the cleaning liquid, and the brush washing device 172 is operated. To clean the surface of the glass G ', the cleaning liquid spraying device 3 (173) operates to spray the cleaning liquid, and the air drying device 174 operates to remove water from the glass G' surface. Washing / drying step (S80); After the second cleaning / drying, the glass G 'withdrawn is taken out through the conveyor device 181 of the carrying out unit 180, and the glass G' taken out through the conveyor device 181 is moved to a power generator. 191 and the cassette C on the support plate 193 which are lifted and operated by the power transmission device 192 are sequentially inserted into the glass storage / alignment step S90.

In the first transfer step (S10) of the present invention proceeds as described above, when the cassette (C) arrives at the withdrawable position, the robot transfer device 111 of the first transfer unit 110 is the glass (G) in the cassette (C) It is loaded and moved to the working plate 121 of the second transfer unit 110.

In the above, the loading of the robot transporting device 111 may be applied to all known technologies such as suction or grip transport.

Next, in the position correction step (S20), after positioning through the camera whether the transported glass G is located at the correct position of the work plate 121, if the position correction is necessary, corrects to the correct position.

 Next, when the glass (G) is positioned at the correct position, in the second conveying step (S30), while the working plate 121 vacuum-adsorbs the glass (G), the power generator 123 of the second transfer unit In operation, the working plate 121 is moved by the transport path 122.

The vacuum adsorption of the glass (G) is made through a through hole 121 'of a back plate device (not shown) that is separately provided and the work plate 121 connected to the line.

Next, in the glass cutting step (S40), when the work plate 121 on which the glass G is seated starts to move, the motor 134 of the cutting unit 130 operates to fix the fixed shaft 136. The glass G is cut by rotating two rotary cutters 131.

The movement speed of the work plate 121, that is, the movement speed of the glass G is 1 to 100 mm / sec, and the rotation speed of the motor 134, that is, the rotation speed of the rotation cutter 131, is 3000 to 60000 rpm.

Next, in the cutting water spraying step (S50), in order to cut the glass G by rotating the rotary cutter 131, cutting to prevent the generation of heat and static electricity due to friction between the rotary cutter 131 and the glass (G). Cutting water is injected from the cutting water spraying rod 141 of the water spraying unit 140.

Next, in the first cleaning / drying step S60, when the glass G is cut and separated into a plurality of pieces, the cleaning liquid spraying device 1 151 of the primary washing unit 150 sprays the cleaning liquid to clean the air, The injector 152 operates to remove water from the surface of the glass G '.

Next, in the third transfer step (S70), after the completion of the first cleaning, the transfer roller that is interlocked by the motor by loading the glass (G ') to be transferred in order the robot transfer device 161 of the third transfer unit 160 in order Moving to 162, and when the loading is completed, the power generator 123 is reversed to return the working plate 121 to its original position.

Next, in the second cleaning / drying step (S80), the cleaning liquid spraying device 2 (171) of the second cleaning and drying unit 170 is operated on the surface of the glass G 'to be transported by the transport roller 162. The cleaning liquid is sprayed, the brush cleaning device 172 is operated to clean the glass G 'surface, the cleaning liquid spraying device 3 173 is operated to spray the cleaning liquid, and the air drying device 174 is operated. Remove moisture from the surface of the glass (G ').

Finally, in the glass storage / sorting step (S90), after the second cleaning / drying, the glass G 'withdrawn is taken out through the conveyor apparatus 181 of the carrying out unit 180, and then, on the conveyor apparatus 181, The glass G 'carried out is sequentially stacked and inserted into the cassette C on the support plate 193 which is lifted and operated by the power generator 191 and the power transmission device 192 to complete the work.

As described above, according to the present invention, the cutting of the doubled glass G is performed by one cutting operation of the cutting part 130, and the process of adjusting the supply position of the glass G cutting cleaning drying carry-out alignment is one line. Will be done automatically.

 In the present invention as described above, in a cutting device for cutting glass (particularly, FPD (plate panel display)) to a certain size, the cutting machine is installed in multiple rows so that cutting is performed and at the same time, cutting water is supplied. By cutting the double glass at a time, the working time can be shortened, while the step of the double glass can be prevented from occurring and the breakage and static electricity can be prevented while the glass feeding position is adjusted. By automatically made in this one line, the effect of maximizing the space utilization and workability according to the installation of the device is obtained.

Claims (9)

In the glass cutting device, the robot (G) 111 which loads the glass (G) arranged in the cassette (C) and transfers it onto the work plate (121), and the glass (G) is seated through the glass image input of the camera. A first transfer part 110 including a position adjusting device 112 for adjusting the work plate 121 to the correct position; A plurality of through holes 121 'and glass cutting grooves 121 ", which are communicated to be sucked under vacuum by a separate back device, are formed in a row, and the work plates 121 are transported through the transfer path 122. A second transfer part 120 including a power generating device 123 for supplying power, a rotary cutter 131 for cutting the glass G seated on the moving work plate 121, and a plurality of rotary cutters The fixed shaft 132 is inserted 131 to maintain a predetermined interval, the rotation shaft 133 is coupled to one end of the fixed shaft 132 to supply the rotational power and the motor 134 A cutting part 130 including a bearing 135 provided so that the end of the fixed shaft 132 on the other side is rotatably supported; and a through hole at a predetermined angle in front of the rotation cutter 131 of the cutting part 130. Cutting water injection rod 141, the cutting water injection rod 141 and the cut to inject the cutting water is formed and supplied A cutting water spraying unit 140 including a blocking plate 142 installed to cover the rotary cutter 131 of the putting unit 130; and a cleaning solution is sprayed onto the surface of the cut glass G 'to be cleaned. A first cleaning unit 150 including a cleaning liquid spraying device 1 151, and an air spraying device 152 for injecting air to dry the cleaning liquid on the glass G 'surface; The robot transfer device 161 for loading the G ') from the work plate 121 and the cut glass G' supplied from the robot transfer device 161 while being interlocked by the rotational power of the motor 162 are transferred. A third conveying unit 160 including a conveying roller 163, and a cleaning liquid spraying device 2 installed on the conveying roller 163 of the third conveying unit 160 to spray a cleaning liquid to clean the surface of the glass G '. 171, the brush cleaning device 172 to remove the foreign matter on the glass G 'surface while rotating, and the table of the glass G' Second cleaning and drying unit 170 including a cleaning liquid spraying device 3 (173) for spraying the cleaning liquid to clean the surface, and an air drying apparatus (174) for spraying air to remove moisture on the surface of the glass (G '). Wow; A carrying-out unit 180 for carrying out the glass G 'to the aligned position through the conveyor device 181; The glass G 'carried out on the conveyor apparatus 181 is sequentially stacked and inserted between the power generator 191 and the cassette C on the support plate 193 which is lifted and operated by the power transmission apparatus 192. Glass in-line cutting device, characterized in that consisting of the glass storage / sorting unit (190). The glass in-line cutting device according to claim 1, wherein the rotary cutter (131) of the cutting unit (130) is a diamond blade bonded using a resin adhesive. The inline cutting device of claim 1, wherein the rotation cutter 131 of the cutting unit 130 is a diamond blade bonded using a metal adhesive. The glass in-line cutting device according to claim 1, wherein the rotation cutter 131 of the cutting unit 130 has a thickness of 30 to 150 µm and a diameter of about 2 to 5 ". The glass in-line cutting according to claim 1, wherein a space maintaining slot 136 is provided between the rotary cutters 131 of the cutting unit 130 so that each rotary cutter 131 is maintained at a predetermined interval. Device. The method of claim 1, The power generator 191 of the glass storage / alignment unit 190 is a motor, the power transmission device 192 is a guide rod installed horizontally with a screw and a screw, and the operation of the power generator 191 detects a sensor. It is made by, characterized in that the glass in-line cutting device, characterized in that configured to move up and down by the same height of the step height of the cassette (C). When the cassette (C) is located in the retractable position, the robot transfer device 111 of the first transfer unit 110 loads the glass (G) in the cassette (C) to the work plate 121 of the second transfer unit (110). A first transfer step (S10) for moving to; A position correcting step (S20) of correcting the correct position to the correct position after the camera confirms whether the transported glass G is correctly positioned at the position of the work plate 121; When the glass G is positioned at the correct position, the work plate 121 vacuum-adsorbs the glass G, and at the same time, the power generator 123 of the second transfer part operates to ride the work path 122 on the work plate. A second conveyance step (S30) of moving the 121; When the work plate 121 on which the glass G is seated starts to move, the motor 134 of the cutting unit 130 operates to rotate the plurality of rotation cutters 131 fixed to the fixed shaft 136 to glass. Glass cutting step (S40) for cutting (G); Cutting water spraying rod 141 of the cutting water spraying unit 140 to prevent the generation of heat and static electricity due to friction between the rotating cutter 131 and the glass (G) in the process of cutting the glass (G) by rotating the rotary cutter (131). Cutting water injection step (S50) for injecting cutting water from the; When the glass G is cut and separated into a plurality of pieces, the cleaning liquid spraying device 1 151 of the primary washing unit 150 sprays the cleaning liquid to clean it, and the air spraying device 152 operates to operate the glass G '. The first washing / drying step (S60) for removing the moisture on the surface, and after the completion of the first cleaning, the robot transfer device 161 of the third transfer unit 160 loads the glass (G ') to be transferred in order A third feed step (S70) for moving on the feed roller 162 linked by the feed roller, and when the loading is completed, the power generator 123 reversely operates to return the work plate 121 to its original position; The cleaning liquid spraying device 2 171 of the second cleaning and drying unit 170 is operated on the surface of the glass G 'transported by the conveying roller 162 to spray the cleaning liquid, and the brush washing device 172 is operated. To clean the surface of the glass G ', the cleaning liquid spraying device 3 (173) operates to spray the cleaning liquid, and the air drying device 174 operates to remove water from the glass G' surface. Washing / drying step (S80); After the second cleaning / drying, the glass G 'withdrawn is taken out through the conveyor device 181 of the carrying out unit 180, and the glass G' taken out through the conveyor device 181 is moved to a power generator. 191 and the cassette (C) on the support plate (193) which is lifted and operated by the power transmission device (192) sequentially inserted into the glass receiving / sorting step (S90) characterized in that proceeds to the glass receiving / sorting step. 8. The glass in-line cutting method according to claim 7, wherein the moving speed of the glass G is 1 to 100 mm / sec. 8. The glass in-line cutting method according to claim 7, wherein the rotation speed of the rotary cutter 131 is 3000 to 60000 rpm.

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