JP6975008B2 - Projection detection device, cutting device - Google Patents

Description

The present invention relates to a protrusion detection device and a cutting device that can be used in a cutting device in which a cutting torch and a work material move relative to each other along a machined surface and can detect a protrusion formed in the work material. ..

Conventionally, as a cutting device for cutting a work material, for example, a cutting device provided with a cutting torch such as a laser torch is widely used.

Conventionally, when processing a work material by a cutting device equipped with a cutting torch, if there is a large protrusion (for example, a step) on the machined surface of the work material, the cutting torch and the work material may come into contact with each other. Therefore, it is desirable that the machined surface is formed as horizontally as possible.

Then, in such a cutting device, when the work material is machined, the machined surface of the work material is detected by a height sensor, and the initial that lowers the cutting torch at high speed based on the detected height of the machined surface. Various techniques relating to a cutting device for suppressing the cutting torch from coming into contact with the work material and being damaged by setting the height are disclosed (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2014-188558

However, when the work material is cut by the cutting device, as the formation of the cut groove progresses, for example, a thin end material located near the edge of the work material may protrude from the machined surface to generate a protrusion. In some cases, a part of the work material (for example, an edge portion) is partially lifted from the surface plate due to the warp generated in the work material, and a protrusion is generated.
If a large protrusion is formed on the machined surface of the work material in this way, the cutting torch may come into contact with the work material and be damaged.

Further, as shown in FIG. 6A, for example, when the cutting device 200 is a laser cutting device that irradiates a laser beam to form a cut groove in the work material W, a cutting torch is required. A light-shielding member 120 is provided on the mobile trolley 110, and the laser torch 111 arranged on the cutting torch mobile trolley 110 divides a space forming a cut groove and a space where a person works (outside), and a laser irradiated from the laser torch 111. Measures have been taken to prevent the beam from leaking to the outside.
In such a light-shielding member 120, it is common to provide a flexible light-shielding skirt portion 121 having flexibility at the lower portion so that a gap does not occur between the light-shielding member 120 and the machined surface WS.

However, for example, as shown in FIG. 6B, when the cut groove C is formed in the workpiece W, when the end material rises from the processed surface WS and a step (protruding portion) WT is generated, the light-shielding skirt portion There is a risk that the 121 will be partially rolled up and the laser beam will leak from the gap WB created between the light-shielding skirt portion 121 and the machined surface WS.

The present invention has been made in consideration of such circumstances, and is used in a cutting device in which a cutting torch and a work material move relative to each other along a machined surface, and is partially on the machined surface of the work material. It is an object of the present invention to provide a protrusion detecting device and a cutting device capable of detecting a formed protrusion.

In order to solve the above problems, the present invention proposes the following means.
The invention according to claim 1 is used in a cutting device in which a work material and a cutting torch move relative to each other along a work surface of the work material to form a cut groove in the work material, and the machined surface is formed. a projecting portion detection apparatus for detecting a projection projecting from, provided with a projecting portion detection sensor for detecting said protruding portions formed on the workpiece, the protruding portion detection sensor is a predetermined distance in the height direction The detection beam is projected and received by the detection beams of a plurality of optical axes arranged at intervals, and the detection beam is projected and received in a direction intersecting the relative movement direction in which the torch and the work material move relative to each other. to a beam sensor, the beam the height direction height of the protruding portions which the beam sensor detects when the reference detection beam of the optical axis to be located on either of the sensors is equal to or greater than the set amount It is characterized in that it is configured to output a protrusion detection signal when it has a height.

According to the projecting portion detecting device according to the present invention, a projecting portion detecting sensor for detecting a projecting portion formed on a work material is provided, and a plurality of projecting portion detecting sensors are arranged at predetermined intervals in the height direction. It is a beam sensor that emits and receives light by the detection beam of the optical axis of the book, and emits and receives the detection beam in the direction intersecting the relative movement direction in which the torch and the work piece move relative to each other. If the height of the protrusions beam sensor detects when the reference detection beam of the optical axis to be located either in the height direction has a set amount or more of the height, the output projections detection signal Therefore, even a protrusion partially formed at any position in the direction intersecting the relative movement direction can be detected within the range of the relative movement. As a result, the protrusions formed on the work material can be efficiently detected over a wide range.
Further, when a protrusion having a height equal to or higher than a set amount is formed with reference to the detection beam of the optical axis located in any of the height directions of the beam sensor, the protrusion is formed on the cutting device. It is possible to suppress the occurrence of problems caused by.
As a result, the laser beam is emitted from the gap generated by the contact between the protruding portion and the member constituting a part of the cutting torch or the cutting device, or the light-shielding member provided in the laser cutting device or the like contacting the protruding portion and rolling up. It is possible to suppress leakage to the outside.

Here, the height of the protruding portion may be based on the machined surface, or may be used as a reference when determining the height of a configuration that can be substituted with the machined surface such as the upper surface of the surface plate.

Further, the fact that the height of the protruding portion is equal to or more than the set amount includes both the case where the determination is made by ON-OF and the case where the set amount of the height of the protruding portion is quantified and compared. ..

Further, the cutting torch means a torch that forms a cut groove in the work material, and includes a laser torch, a plasma torch, a gas torch, and the like.

The invention according to claim 2 includes a surface plate on which a work material is arranged and a cutting torch that forms a cut groove in the work material, and the cutting torch and the work material are placed on a machined surface. It is a cutting device that moves relative to each other along the workpiece to form a cut groove in the work material, and is characterized by including the protrusion detecting device according to claim 1.

According to the cutting device according to the present invention, the protrusion detection device detects a protrusion exceeding a set amount and outputs a protrusion detection signal, so that problems caused by the protrusion can be efficiently suppressed. Can be done.
As a result, for example, from the contact between the member constituting a part of the cutting device such as a cutting torch and the protruding portion, or from the gap generated due to the light-shielding member provided in the laser cutting device or the like being rolled up by the protruding portion. It is possible to suppress the leakage of the laser beam to the outside.

The invention according to claim 3 is the cutting apparatus according to claim 2 , wherein the cutting torch is a laser torch that irradiates a laser beam to form a cut groove, and the laser torch makes a cut groove in the work material. It is characterized in that it is provided with a light-shielding member that suppresses the irradiated laser beam from leaking to the outside from between the irradiated laser beam and the material to be processed.
The invention according to claim 4 is the cutting device according to claim 3, wherein the cutting torch moving carriage equipped with the cutting torch and the cutting torch moving carriage attached to the cutting torch moving carriage have a light-shielding cover portion and a light-shielding skirt portion. The light-shielding member is provided with a light-shielding member, and the protrusion detection device provided with a control unit that outputs the protrusion detection signal, stops the cutting device, and outputs an alarm.

According to the cutting device according to the third aspect of the present invention, it is possible to prevent the laser beam from leaking to the outside through the gap generated by the light-shielding member provided in the laser cutting device or the like coming into contact with the protruding portion and being rolled up. can.
As a result, safety and hygiene can be ensured in the cutting work of the work material by the laser cutting device.

It is a perspective view explaining an example of the schematic structure of the laser cutting apparatus which concerns on one Embodiment of this invention. It is a top view explaining the schematic structure of the laser cutting apparatus which concerns on one Embodiment of this invention. It is a figure explaining the schematic structure of the laser cutting apparatus which concerns on one Embodiment of this invention, (A) is the schematic view which saw the laser cutting apparatus from the front, (B) explains the details of the protrusion detection apparatus. It is a conceptual diagram to be used. It is a partial cross-sectional view seen from the side explaining the schematic structure of the laser cutting apparatus which concerns on one Embodiment of this invention. It is a schematic block diagram explaining an example of the protrusion detection apparatus which concerns on one Embodiment of this invention. It is a figure explaining the outline of the rift formation by the conventional laser cutting apparatus, (A) is the figure which shows the state which the step was formed by forming the rift, (B) is the figure which shows the state which the step was formed by the step, and (B) is the light-shielding skirt portion by the step. It is a conceptual diagram which shows the state which the gap is formed between the and a work material.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
FIG. 1 is a perspective view illustrating an example of a schematic configuration of a laser cutting device according to a first embodiment of the present invention, FIG. 2 is a plan view illustrating a schematic configuration of a laser cutting device, and FIG. 3 is a laser. It is a figure explaining the schematic structure of the cutting device, FIG. 3A is a schematic view which viewed the laser cutting device from the front, and FIG. 3B is a conceptual diagram explaining the details of the protrusion detection device. .. Further, FIG. 4 is a partial cross-sectional view seen from the side for explaining the schematic configuration of the laser cutting device.

In FIGS. 1 to 5, reference numeral 100 is a laser cutting device (cutting device), reference numeral 20 is a cutting torch moving carriage, reference numeral 21 is a laser torch (cutting torch), reference numeral 50 is a protrusion detection device, and reference numeral 51 is a reference numeral 51. The beam sensor (projection detection sensor), reference numeral W indicates a work material, reference numeral WS indicates a processed surface, and reference numeral WT indicates a protrusion.

As shown in FIGS. 1 to 4, the laser cutting device (cutting device) 100 includes, for example, a surface plate 10, a cutting torch moving carriage 20, a laser torch (cutting torch) 21, and a light-shielding cover (light-shielding member) 40. A protrusion detection device 50 and a control unit 60 are provided, and the laser torch 21 is configured to move along the machined surface WS to form a groove in the work piece W.

The surface plate 10 is formed in a rectangular shape, for example, and is horizontally arranged on the floor surface so that the work material W can be placed on the surface plate 10.

The cutting torch moving trolley 20 is, for example, a laser torch 21, a traveling trolley 22 that moves in the traveling direction (X-axis direction) with respect to the platen 10, and a traveling trolley 22 that is mounted on the traveling trolley 22 and has a traverse direction (on the traveling trolley 22). It is equipped with a traversing carriage 23 that is movable in the Y-axis direction and is equipped with a laser torch 21.
The cutting torch moving carriage 20 is capable of moving the laser torch 21 in the X-axis direction and the Y-axis direction.

The laser torch (cutting torch) 21 has, for example, a structure in which the tip side of a cylindrical portion is formed in a substantially conical shape and a nozzle hole (not shown) is opened at the tip, and an assist gas is injected and a fiber laser oscillator (not shown) is injected. The laser beam generated in (shown in the figure) is irradiated from the nozzle hole to form a groove in the work piece W.
Further, the laser torch 21 is configured to be movable in the height direction (Z-axis direction) and can be rotated along the X-axis direction and the Y-axis direction, for example.

A fiber laser oscillator (not shown) includes, for example, an LD (laser diode) and an amplification fiber, and a laser beam oscillated by the LD (laser diode) is amplified by the amplification fiber and can be used for cutting. It is configured to generate (eg, 1000 nm wavelength band).
The laser beam generated by the fiber laser oscillator is transmitted to the laser torch (cutting torch) 21 via a transmission fiber (not shown).

The light-shielding member 40 includes, for example, a light-shielding cover portion 41 formed by processing a metal plate and configured to cover the laser torch 21, a light-shielding skirt portion 42 arranged below the light-shielding cover portion 41, and a traveling carriage 22. A light-shielding skirt portion 43 arranged on the rear side in the traveling direction is provided, and the laser torch 21 is configured to irradiate a laser beam to partition a space forming a groove in the workpiece W from the outside.

As shown in FIG. 4, the light-shielding cover portion 41 is formed from above the laser torch 21 toward the front side (front side in the traveling direction) and is outside when viewed along the Y-axis direction (side view). A first wall portion 41A that bulges toward the direction and a second wall portion 41B arranged on both sides of the first wall portion in the Y-axis direction are provided, and the front side and both sides of the cutting torch moving carriage 20 and the laser torch 21 are provided. It is designed to cover the part.

Further, the light-shielding cover portion 41 is connected to the upper part of the cutting torch moving carriage 20 via a hinge structure, for example, and is configured to cover the front side of the laser torch 21 in the traveling direction.
The hinge structure is composed of, for example, a rotating shaft 41C arranged along the Y-axis direction, and the light-shielding cover portion 41 can be rotated around the rotating shaft 41C to open and close the light-shielding cover portion 41. It is said that.

The light-shielding skirt portion 42 is composed of, for example, a plurality of flexible flame-retardant sheets formed to a predetermined width.
Further, the light-shielding skirt portion 42 is attached to the lower portion of the light-shielding cover portion 41 on the front side so as to hang down along the Y-axis direction.

The light-shielding skirt portion 43 is composed of, for example, a plurality of flexible flame-retardant sheets formed to a predetermined width.
Further, the light-shielding skirt portion 43 is attached to the lower portion of the traveling carriage 22 on the rear side in the traveling direction so as to hang down along the Y-axis direction, and is rearward in the traveling direction from the space on the laser torch 21 side formed below the traveling carriage 22. It is designed to block the space leading to the side.

Hereinafter, an example of a schematic configuration of the protrusion detection device will be described with reference to FIGS. 1 to 4 and 5. FIG. 5 is a schematic configuration diagram illustrating an example of the protrusion detection device.

The protrusion detection device 50 includes a protrusion detection sensor that detects the protrusion WT formed on the workpiece, and when the height of the protrusion WT detected by the protrusion detection sensor is based on the machined surface WS. When the amount is equal to or greater than the set amount, the protrusion detection signal is output.

In this embodiment, the protrusion detection sensor is configured by, for example, a beam sensor 51.
The beam sensor (projection detection sensor) 51 is, for example, a first beam sensor 511 arranged on the front side in the traveling direction of the cutting torch moving carriage 20, and a second beam sensor 511 arranged on the rear side in the traveling direction of the cutting torch moving carriage 20. It is equipped with a beam sensor 512.

The first beam sensor 511 includes a light projecting unit 511A that projects the detection beam L and a light receiving unit 511B that receives the detection beam L.
Further, the first beam sensor 511 is attached to the left and right second wall portions 41B of the light shielding cover 41, and the light emitting portion 511A and the light receiving portion 511B are arranged so as to face each other along the light shielding skirt portion 42.

Further, the first beam sensor 511 is configured to receive and receive light by, for example, a plurality of optical axes arranged at predetermined intervals in the height direction. The number of optical axes of the first beam sensor 511 can be arbitrarily set.

The light projecting section 511A and the light receiving section 511B can be adjusted in the vertical direction by a height adjusting member (not shown), and the height of the detectable protruding portion WT can be set by adjusting the height. It is said that.

The second beam sensor 512 includes a light projecting unit 512A that projects the detection beam L and a light receiving unit 512B that receives the detection beam L.
Further, the second beam sensor 512 is attached to the inner surface of the leg portion of the traveling carriage 22 that supports the cutting torch moving carriage 20 on both sides in the Y-axis direction, and the light emitting portion 512A and the light receiving portion 512B are the light shielding skirt portion 43. They are arranged so as to face each other along the.

Further, the second beam sensor 512 is adapted to emit and receive light by, for example, a plurality of optical axes arranged at predetermined intervals in the height direction. The number of optical axes of the second beam sensor 512 can be arbitrarily set including whether or not the number is the same as that of the first beam sensor 511.

The light projecting unit 512A and the light receiving unit 512B can be adjusted in the vertical direction by a height adjusting member (not shown), and the height of the detectable protrusion WT can be set by adjusting the height. It is said that.

The pitch P of the optical axis of the first beam sensor 511 and the second beam sensor 512 can be arbitrarily set within a range in which the protrusion WT can be detected. At that time, it is preferable to set the pitch P of the optical axis in consideration of the state of the machined surface WS of the work material W, the amount of deformation generated in the end material of the work material W by forming the cut groove, and the like. Is.
Specifically, as shown in FIG. 5, the pitch P of the optical axes of the first beam sensor 511 and the second beam sensor 512 is set to be smaller than the plate thickness t of the work material W in the protrusion WT. It is preferable in that it is possible to detect the protrusion WT at an arbitrary height even when a space is created below.

Further, the heights of the first beam sensor 511 and the second beam sensor 512 can be arbitrarily set.
For example, as shown in FIG. 5, in the initial setting stage where the protrusion WT is not detected, the detection beam LA (L) of the optical axis located below is shielded by the surface plate 10 and the work material W. Then, in the initial setting stage, the protrusion WT may be detected by shading the optical axis LB (L) located above the machined surface WS.

In such a case, if the detection beam LB (L) of any of the optical axes located above the machined surface WS is shielded from light, it may be determined that there is a protrusion WT, or the light-shielded detection beam LB may be determined. It may be determined that there is a protruding portion WT depending on the number of (L), and the determination method can be arbitrarily set.

Further, the heights of the first beam sensor 511 and the second beam sensor 512 are set so that, for example, the optical axis located at the lowermost position is located above the machined surface WS, and the optical axis located at the lowermost position is detected. It may be determined that there is a protrusion WT when the beam is shielded by the protrusion.
Further, it may be determined that there is a protrusion WT when the detection beam of any of the optical axes located above the machined surface WS is shielded, and there is a protrusion WT depending on the number of shaded detection beams. May be determined.

The control unit (projection detection device) 60 moves, for example, the cutting torch moving carriage 20 in the X-axis direction and the Y-axis direction based on the set NC data, injects an assist gas from the laser torch 21, and emits a laser beam. It is configured to form a cut groove in the workpiece W by irradiation.
Further, the control unit 60 includes a protrusion determination unit (not shown).

The protrusion determination unit receives the optical axis signal output by the beam sensor 51, and outputs a protrusion detection signal when it is determined that there is a protrusion WT.
In this embodiment, the control unit 60 is configured to stop the cutting device 100 and output an alarm when the protrusion detection signal is output.

According to the protrusion detection device 50 according to the embodiment, the protrusion WT having a height of the set amount H or more is detected from the machined surface WS formed on the workpiece W by the beam sensor 51, and the protrusion detection signal is obtained. Is output, it is possible to suppress the occurrence of a problem caused by the protrusion WT in the cutting device.

As a result, it is possible to prevent the laser beam from leaking to the outside from the gap formed by the light-shielding skirts 42, 43 of the light-shielding member 40 provided in the laser cutting device 100 coming into contact with the projecting portion WT and being rolled up.
As a result, it is possible to ensure the safety and health of the workplace around the laser cutting device 100.

Further, according to the laser cutting device 100 according to the embodiment, the protruding portion detection sensor is a beam sensor 51 that emits and receives the detection beam L in a direction orthogonal to (crossing) the moving direction of the cutting torch moving carriage 20. Therefore, by moving the cutting torch moving carriage 20 in the X-axis direction, even a protruding portion WT partially formed at any position in the Y-axis direction within the moving range can be detected.
As a result, the protruding portion WT formed on the workpiece W can be efficiently detected over a wide range.

The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the invention.

For example, in the above embodiment, the case where the laser torch is applied to the laser cutting device 100 that irradiates the laser beam in the 1000 nm wavelength band generated by the fiber laser oscillator has been described, but the case is not limited to the fiber laser oscillator, and for example, CO _2. It may be applied to a laser cutting device provided with a laser oscillator or a YAG laser oscillator.
Further, instead of the laser cutting device, it may be applied to a plasma cutting device or a gas cutting device.

Further, in the above embodiment, the beam sensor (projection portion detection sensor) 51 irradiates the detection beam L along the light-shielding skirt portions 42, 43 arranged in the direction orthogonal to the traveling direction (X-axis direction). Although the case where the sensor is arranged in the above is described, the detection beam L may be arranged so as to emit and receive the detection beam L in an arbitrary direction in which the beam sensor (projection detection sensor) 51 intersects the traveling direction (X-axis direction).

Further, in the above embodiment, the beam sensor (protruding portion detection sensor) 51 irradiates the detection beam L along the direction intersecting the transverse direction (Y-axis direction) instead of the traveling direction (X-axis direction). Alternatively, the detection beam L may be irradiated along both the direction intersecting the traveling direction (X-axis direction) and the direction intersecting the transverse direction (Y-axis direction).

Further, in the above embodiment, the case where the beam sensor (projection detection sensor) 51 is attached to the traveling carriage 22 via the height adjusting member has been described, but whether or not the height adjusting member is provided is arbitrary. Can be set.

Further, in the above embodiment, the case where the projecting portion detecting device 50 detects the projecting portion WT generated by the lifting of the end material when forming the cut groove in the workpiece W has been described, but the projecting portion detecting is described. The form of the protrusion WT detected by the device 50 can be arbitrarily set. For example, various protrusions formed on the machined surface WS of the workpiece W (protrusions formed before machining). Etc.) may be applied to detect.
Further, it may be applied to detect a protruding portion formed by the edge portion of the workpiece W separated from the surface plate 10 due to the warp generated in the workpiece W.

Further, in the above embodiment, the case where the protrusion detection device 50 determines the height of the protrusion WT with reference to the machined surface WS has been described. For example, the upper surface of the surface plate 10 is a substitute characteristic of the machined surface WS. It may be determined as a reference when detecting the protruding portion WT. In this way, by detecting the protruding portion WT with the upper surface of the surface plate 10 as a substitute characteristic of the machined surface WS, the edge portion of the workpiece W is lifted from the surface plate 10 due to the warp, and the protruding portion or the like. It is suitable for detecting.

Further, in the above embodiment, for example, the case where the cutting device includes the light-shielding member 40 has been described, but whether or not the cutting device 40 is provided and the configuration of the light-shielding member 40 can be arbitrarily set. The configuration may not include a light-shielding skirt portion.

Further, in the above embodiment, the protrusion detecting device 50 includes beam sensors 511 and 512 along the light-shielding skirt portion 42 on the front side in the traveling direction of the traveling carriage 22 and the light-shielding skirt portion 43 on the rear side, respectively. However, for example, the beam sensor 51 may be arranged only on either the front side or the rear side of the traveling vehicle 22 in the traveling direction.
Further, instead of the traveling carriage 22, the protrusion detecting device 50 may be arranged in another portion of the cutting torch moving carriage 20.

Further, in the above embodiment, the case where the protrusion detecting device 50 is provided for the purpose of suppressing the laser beam from leaking from the light shielding member 40 has been described. For example, the laser torch (cutting torch) 21 and the cutting torch moving carriage 20 have been described. The protrusion detection device 50 may be provided for other purposes such as suppressing the member constituting the member from coming into contact with the protrusion WT.

Further, in the above embodiment, the case where the laser torch 21 arranged on the cutting torch moving carriage 20 is applied to the laser cutting device 100 that moves in the traveling direction and the transverse direction with respect to the surface plate 10 has been described. Instead of the dolly 20, the surface plate 10 may be moved.
Further, it may be applied to a cutting device in which the cutting torch moving carriage 20 moves in only one direction (for example, a traveling direction).

Further, in the above embodiment, for example, the case where the beam sensor 51 is used as the protrusion detection sensor has been described, but instead of the beam sensor 51, a plurality of displacement detection sensors (for example, laser displacement) arranged at arbitrary positions have been described. A protruding portion may be detected by a sensor or the like), and the height of the detected protruding portion WT may be compared with a threshold value (set amount) to determine whether or not the protruding portion is equal to or larger than the set amount.

Further, in the above embodiment, the case where the laser cutting device 100 is stopped and the alarm is output by the protrusion detection signal output by the protrusion detection device 50 has been described. However, how is the protrusion detection signal used? Can be set arbitrarily.

According to the protrusion detection device and the cutting device according to the present invention, it is possible to detect a protrusion partially formed on the machined surface of the work material, so that it can be industrially used.

W Work material WS Machined surface WT Protruding part 10 Surface plate 20 Cutting torch Moving cart 21 Laser torch (cutting torch)
40 Light-shielding member 50 Projection detection device 51 Beam sensor (projection detection sensor)
100 Laser cutting device (cutting device)

Claims (4)

The work material and the cutting torch are used in a cutting device that moves relative to each other along the work surface of the work material to form a cut groove in the work material, and a protrusion that detects a protrusion protruding from the work surface is detected. It is a part detection device
Includes a projecting portion detection sensor for detecting the height of the formed workpiece the projecting portion,
The protrusion detection sensor is configured to emit and receive light by detecting beams of a plurality of optical axes arranged at predetermined intervals in the height direction, and the cutting torch and the work material move relative to each other. A beam sensor that emits and receives the detected beam in a direction intersecting the direction.
If having the height the beam sensor height is set amount or more of the height of the protrusions was detected when relative to the detection beam of the optical axis that is positioned in either direction of the beam sensor , A protrusion detection device characterized in that it is configured to output a protrusion detection signal. The surface plate on which the work material is placed and
And said cutting torch for forming a kerf said the workpiece,
Equipped with
A cutting apparatus and the cutting torch and the workpiece to form a kerf in the workpiece by relative movement along the working surface,
A cutting device comprising the protrusion detecting device according to claim 1. The cutting device according to claim 2.
The cutting torch is a laser torch that irradiates a laser beam to form a groove.
Cutting the torch is in forming kerfs the the workpiece, characterized in that the laser beam is irradiated and a suppressing shielding member from leaking to the outside from between the workpiece Device. A cutting torch moving trolley equipped with the cutting torch,
The light-shielding member attached to the cutting torch moving carriage and having a light-shielding cover portion and a light-shielding skirt portion,
The protrusion detection device provided with a control unit that outputs the protrusion detection signal, stops the cutting device, and outputs an alarm.
The cutting device according to claim 3, further comprising.

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