JP2013158790A - Laser beam machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a laser beam machine favorably preventing leakage of laser beams to the outside regardless of a long workpiece.SOLUTION: A laser beam machine includes: a table (2) made movable in one direction; a laser beam machining part (LK) having a laser beam head (LH) performing laser beam machining on a workpiece (W) placed on it; a partition (3) having an opening (M2) that the table (2) goes in and out in one direction and surrounding the laser beam machining part (LK); and a laser beam intercept part (LS) intercepting the laser beam directing toward the outside through the opening (M2) when performing laser beam machining on the workpiece (W). The laser beam intercept part (LS) has: a shading member holding tool (7a) laid over the opening (M2) and having a plurality of vertically formed through-holes (7a1); and a plurality of bar-shaped shading members (7b) inserted into the plurality of respective through-holes (7a1) so as to be restricted in downward movement from a predetermined position and to be vertically movable. The shading members (7b) can close the opening (M2) by lying one upon another at least in one direction.

Description

  The present invention relates to a laser beam machine, and more particularly, to a laser beam machine including a laser beam blocking structure that satisfactorily prevents leakage of laser beam to the outside.

Patent Document 1 describes an example of a laser processing machine provided with a laser light blocking structure that prevents laser light from leaking outside during laser processing.
A laser processing machine described in Patent Document 1 includes a column that is provided with a laser processing head and is provided so as to straddle the table from above the table, and a blocking plate that closes an opening through which a workpiece between the column and the machine enters and exits. A block plate unit comprising a plurality of plates suspended around an upper plate support rod as an axis, and configured to allow a workpiece to pass under the plate at the opening. Yes.

  According to this configuration, in the case where the workpiece has a shape having a convex part with a large height, only the plate corresponding to the convex part is pushed up by the convex part in the opening so that the convex part It is said that since the part other than the workpiece in the opening is closed by another plate that does not correspond, leakage of the laser light to the outside can be surely prevented.

Japanese Utility Model Publication No. 4-113183

Here, consider a case where a long workpiece W having a predetermined height H1, such as a steel pipe or a section steel, is processed by a laser processing machine having a laser light blocking structure as described in Patent Document 1.
FIG. 10 is a perspective view showing the vicinity of the opening 100k in the laser processing machine 100, and shows a state in which laser processing is performed on a workpiece W that is a long steel pipe.

The laser processing machine 100 is divided by a surrounding partition (not shown) surrounding a processing area, and an opening 100k is provided on the side of the work loading side and the unloading side. The opening 100k shown in FIG. 10 is an opening on the carry-out side.
In a state in which the workpiece W is not carried in, the opening 100k is blocked by a plurality of plates 101 suspended freely around the rotation axis CL101 in a natural state in the vertical direction. .
And when processing the long workpiece | work W, when the length is longer than the feed direction length of a processing area, the state which the workpiece | work W penetrated the opening part 100k from the inner side of the processing area, and the part protruded outside ( Laser processing is performed in the state shown in FIG.

In this state, the plate 101a (five pieces in FIG. 10) located at a position corresponding to the workpiece W among the plurality of plates 101 is rotated around the rotation axis CL101 by the workpiece W and lifted.
Accordingly, a gap S is always generated during laser processing between the plate 101a and the plate 101 that is not pushed by the workpiece W and is suspended in the vertical direction. There is a high possibility of leakage.
The gap S becomes wider as the workpiece height H1 increases, because the rotation angle of the plate 101a increases.
For this reason, it is desired for a laser processing machine to have a blocking structure that does not leak laser light to the outside even when the workpiece is long.

  Therefore, the problem to be solved by the present invention is to provide a laser beam machine that can prevent leakage of laser light to the outside even when the workpiece is long.

In order to solve the above problems, the present invention has the following configuration.
1) A table (2) capable of reciprocating in one direction;
A laser processing unit (LK) having a laser head (LH) for performing laser processing on the workpiece (W) placed on the table (2);
A partition (3) having an opening (M2) in which the table (2) enters and exits in the one direction and surrounds the laser processing part (LK);
During laser processing of the workpiece (W) by the laser head (LH), a laser beam blocking unit (LS) that blocks laser beams going to the outside through the opening (M2),
A laser processing machine equipped with
The laser light blocking unit (LS) is
A light-shielding member holder (7a) having a plurality of through-holes (7a1) that is passed above the opening (M2) and formed in the vertical direction, and each of the plurality of through-holes (7a1) from a predetermined position. A plurality of rod-shaped light-shielding members (7b) inserted so as to be movable in the vertical direction with the downward movement restricted, and
The plurality of light shielding members (7b) is a laser processing machine (51) characterized in that it overlaps each other in at least the one direction so as to be capable of closing the opening (M2).
2) When the light-shielding member holder (7a) has a drive unit (6) that moves up and down, and the table (2) is at the position of the opening (M2),
At the position where the light shielding member holder (7a) is lowered, the opening (M2) is closed in at least the one direction by the plurality of light shielding members (7b),
A predetermined gap (M3) is formed between the lower end of all the plurality of light shielding members (7b) and the table (2) at a position where the light shielding member holder (7a) is raised. The laser beam machine (51) according to 1).
3) The workpiece (W) is placed on the table (2) at the position of the opening (M2), and the light-shielding member holder (7a) is lowered by the drive unit (6). When
The light shielding member (7b1) at a position corresponding to the workpiece (W) among the plurality of light shielding members (7b) is in contact with the upper surface (Wa) of the workpiece (W), and the opening (M2). The laser beam machine (51) according to 2), which closes a range immediately above the workpiece (W).
4) Any one of 1) to 3), wherein the plurality of light shielding members (7b) are arranged in a predetermined arrangement pattern including a plurality of rows in a direction intersecting the one direction. A laser beam machine (51).
5) A drive unit (5) for moving the laser head (LH) within a predetermined range (AR) inside the partition (3),
The arrangement pattern and the predetermined range (AR) are a laser beam emitted from the laser head (LH) at an arbitrary position within the predetermined range (AR) hits one of the plurality of light shielding members (7b). The laser beam machine (51) according to 4), which is set as described above.
6) The plurality of light shielding members (7b) are formed of a resin material having a property of absorbing light having a wavelength of laser light emitted from the laser head (LH). 1) to 5) A laser processing machine (51) according to any one of the above.

  According to the present invention, the effect that leakage of laser light to the outside can be satisfactorily prevented even when the workpiece is long is obtained.

It is a front view for demonstrating the Example of the laser beam machine of this invention. It is an external appearance perspective view for demonstrating the Example of the laser beam machine of this invention. It is a front view for demonstrating the principal part in the Example of the laser beam machine of this invention. It is SS sectional drawing in FIG. It is a schematic diagram for demonstrating the arrangement pattern of the light shielding member in the Example of the laser beam machine of this invention. It is another front view for demonstrating the principal part in the Example of the laser beam machine of this invention. It is a typical top view for demonstrating the positional relationship of the light-shielding part and head movement area | region in the Example of the laser beam machine of this invention. It is a schematic diagram for demonstrating the modification 1 in the Example of the laser beam machine of this invention. It is a schematic diagram for demonstrating the modification 2 in the Example of the laser beam machine of this invention. It is a perspective view for demonstrating the conventional laser beam machine.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to FIGS.
First, a schematic configuration of a laser beam machine 51 that is an embodiment of the laser beam machine according to the present invention will be described with reference to FIGS.
FIG. 1 is a front view of a laser beam machine 51, and FIG. 2 is a perspective view of its main part. 1 and 2 also show the workpiece W.
In the following description, the up / down / left / right and front / back directions are defined by directions indicated by arrows in FIG.

  The laser beam machine 51 includes a rail base 1 installed in a straight line on the floor FL, a table 2 that can be reciprocated on the rail base 1 by a driving device (not shown), and a longitudinal center portion of the rail base 1. Are provided with a laser processing part LK and an enclosure partition 3 surrounding the laser processing part LK. In FIG. 1, for convenience, the partition 3 is shown only by the outline, and the internal laser processing part LK and the workpiece W are shown by solid lines.

  The workpiece W is carried in from the right side of the laser processing machine 51, is subjected to laser processing in the laser processing unit LK, and is then carried out to the left side.

  The laser processing unit LK drives the head unit 4 including a laser head LH that emits laser light, and the head unit 4 in a range of a distance L1 and a distance L2 with two axes in the left-right direction and the front-rear direction, respectively. And a drive unit 5 that is positioned at an arbitrary position in a rectangular head movement area AR (see FIG. 7) in plan view. The partition 3 is formed surrounding the head movement area AR.

  An operation panel 8 is disposed in the vicinity of the partition 3. The operation panel 8 includes an operation unit SA for operating the laser beam machine 51, and includes a drive unit that moves the table and a control unit SG that controls the operation of the drive unit 5. The position of the control unit SG is not limited to this example.

As shown in FIG. 2, the partition 3 is provided as a frame-like partition provided so as to surround the laser processing portion LK and close the left and right sides.
The front side can be opened and closed by a plurality of slide doors 3a. Each sliding door 3a is provided with a viewing window 3a1 formed of a resin that can be visually recognized inside and substantially impermeable to laser light.
The rear side is a wall portion 3b without a window in which the drive unit 5 is disposed.
The height of the slide door 3a and the wall 3b is set to a height sufficiently exceeding the height of the person.
On the left side and the right side, doors 3L and 3R having hinges 3c1 on the wall 3b side and opening and closing in the direction of the arrow DR1 are provided.
In the partition 3, the door 3R is a door on the carry-in side of the work W, and the door 3L is a door on the carry-out side.

Since the doors 3L and 3R are formed symmetrically and have substantially the same structure, the door 3L will be described in detail below as a representative.
The door 3L has a viewing window 3La1 formed of the same material as the viewing window 3a1. The height position of the upper end of the door 3L is substantially aligned with the height of the slide door 3a and the wall 3b. The height position of the lower end is a gap M2 (vertical distance H2) that is a predetermined opening between the upper surface 2a of the table 2 (indicated by a two-dot chain line in FIG. 2) that moves on the rail base 1. It is set to be obtained.

Further, a laser light blocking unit LS is provided on the side of the partition 3 where the workpiece W enters and exits. Here, a laser light blocking part LS is provided in the door 3L.
The laser beam blocking unit LS includes an air cylinder 6 provided on each of the front and rear end portions on the inner surface of the door 3L, and a light blocking unit 7 that moves up and down by the operation of the air cylinder 6. The operation of the air cylinder 6 is controlled by the control unit SG.
When the table 2 is positioned directly below the door 3L, the gap M2 can be blocked by the lowered light shielding portion 7.

Next, the laser light blocking unit LS will be described in detail with reference to FIGS.
FIG. 3 is a view of the laser light blocking portion LS as viewed from the left side in FIG. 2 and shows a state in which the rod 6a of the air cylinder 6 is contracted. 4 is a cross-sectional view taken along the line SS in FIG.

The light shielding part 7 has a plurality of through holes 7a1, and includes a bar holder 7a supported at both ends in a horizontal posture by a pair of rods 6a, and a light shielding bar 7b which is a light shielding member inserted into each through hole 7a1. Have. Specifically, the bar holder is disposed so as to cross along the gap M2 (in the front-rear direction) above the gap M2, which is a predetermined opening.
The plurality of through-holes 7a1 are formed in the vertical direction (vertical direction) in the horizontally supported bar holder 7a under the conditions exemplified later.

The light-shielding bar 7b has a round bar shape and is made of a metal such as iron or aluminum, or a resin material having a high optical density (OD value) with respect to the wavelength of laser light emitted from the laser head LH. The cross-sectional shape of the light shielding bar 7b is not limited to a circular shape.
When the material of the light-shielding bar 7b is resin, it is preferable that the material has visible light permeability and can visually recognize the internal processing state or the like through the light-shielding portion 7 from the outside. An example of the material is polycarbonate resin. The OD value is desirably 6 or more.

A flange 7bf that is radially expanded so as not to pass through the through hole 7a1 is formed at the upper end of the light shielding bar 7b.
The light blocking bar 7b is inserted into the through hole 7a1 so as to be smoothly moved up and down without play. Specifically, the light shielding bar 7b is inserted so as to drop in the through hole 7a1 to a position where the flange 7bf abuts on the upper surface 7a2 of the bar holder 7a by at least its own weight. That is, the movement of the light shielding bar 7b below the predetermined position is restricted.

  When viewed from a direction orthogonal to the extending direction of the bar holder 7a, the plurality of light shielding bars 7b are arranged in two rows of the near side and the far side, as will be described later. The light shielding bar 7b is disposed so as to overlap each other without a gap.

  The light-shielding portion 7 moves up and down as the rod 6a expands and contracts in the vertical direction by the operation of the air cylinder 6. A moving distance (moving stroke) associated with the expansion and contraction is set as a distance H3. If the distance between the lower end surface 7bs of the light shielding bar 7b and the upper surface 2a of the table 2 at the lower limit position of the movement stroke is a distance H3a, the distance H3a is a small value of 0 (zero) to 5 mm. The gap M3 is substantially closed by the plurality of light shielding bars 7b. That is, the gap M3, which is an opening, can be closed by the light shielding bar 7b.

As an example of the conditions for forming the through hole 7a1, the light shielding bar 7b is disposed as shown in FIG. 4, for example. The arrangement pattern of FIG. 4 is partially enlarged in FIG.
That is, the light shielding bar 7b is a round bar having a diameter Da, and a plurality of light shielding bars 7b are arranged at a predetermined pitch P1 on a center line CL7a parallel to the extending direction of the bar holder 7a (left and right direction in FIG. 6). A row and a B row arranged at a pitch P1 at a distance of half the pitch P1 in the direction of the center line CL7b with respect to the A row on the center line CL7b parallel to the center line CL7a by a distance Da. Two rows.
Here, if P1 <3 × Da, the laser light LT incident at least in parallel with the light shielding portion 7 in the extending direction of the table 2 (vertical direction in FIG. 6) is shielded from either the B row or the A row. It is absorbed by hitting the bar 7b and cannot pass through the light-shielding portion 7, so that a blocking effect is exhibited.

The laser beam machine 51 according to the embodiment performs an operation called repositioning when machining a long workpiece W. In the repositioning, when there are a plurality of processing parts of the workpiece W spaced apart in the longitudinal direction, the laser beam irradiation is stopped once the laser processing of one processing part is finished, and the table 2 is moved together with the workpiece W to move to the next position. This is a position changing operation in the longitudinal direction of the workpiece W, in which the processing part is positioned in the head movement area AR, and laser processing is performed again by emitting laser light at that position.
Therefore, when the length of the workpiece W is longer than the length of the partition 3 in the longitudinal direction (left-right direction), laser processing and repositioning are repeatedly performed with a part of the partition 3 protruding from the partition 3. There is a case.

When the laser processing of the predetermined part is completed, the control unit SG stops the irradiation of the laser beam and contracts the rod 6a of the air cylinder 6 to move the light shielding unit 7 in the up-and-down range before executing the next repositioning operation. Lift it to the top position.
When the rod 6a is contracted, the bar holder 7a is raised, and accordingly, the light shielding bar 7b in a state where the flange 7bf is in contact with the upper surface 7a2 of the bar holder 7a is also raised. A gap M3 is formed between the front end surface 7bs of 7b and the upper surface 2a of the table 2 when the table 2 is positioned directly below the light shielding bar 7b, so that the distance in the vertical direction is the sum of the distance H3 and the distance H3a. . This state is shown in FIG.
The vertical distance H3 of the gap M3 is equal to or smaller than the vertical distance H2 of the gap M2 related to the lower end of the door 3L and exceeds the maximum height of the workpiece W that can be machined by the laser beam machine 51 in terms of specifications. Is set to

The movement accompanying repositioning of the workpiece W is performed in a state where the light shielding portion 7 is lifted to the uppermost position.
Here, repositioning that is set so that the workpiece W passes through the position where the door 3L is closed and protrudes outward and the subsequent laser processing will be described with reference mainly to FIG. FIG. 6 is a view corresponding to FIG. 3 and shows a state in which the rod 6a is extended.

When the workpiece W is set so that a part of the workpiece W protrudes from the partition 3, the rod is operated by operating the air cylinder 6 before starting laser processing (before emitting laser light) according to an instruction from the control unit SG. 6a is extended to the longest position.
Thereby, the light-shielding part 7 is lowered, and the position corresponding to the work W in the light-shielding bar 7b, that is, the light-shielding bar 7b1 that comes into contact with the upper surface Wa of the work W when the light-shielding part 7 is lowered comes into contact. Stop in position.
Here, since the light-shielding bar 7b1 can move smoothly in the through hole 7a1 in the vertical direction with respect to the bar holder 7a without any backlash, the bar holder 7a continues to descend.
Then, the light shielding bar 7b2 that is not in a position corresponding to the workpiece W, that is, not in contact with the upper surface Wa of the workpiece W, is lowered to the lowest position together with the bar holder 7a.
After the lowering of the light shielding unit 7 is completed and the gap M3 is closed by the light shielding bar 7b2, the control unit SG instructs the oscillation of the laser light.

As a result, the gap M3 existing in the state where the light shielding part 7 is lifted to the uppermost position is at least the work W and the light shielding bar 7b (light shielding bar 7b1 and light shielding) when viewed from the left side of the laser processing machine 51. Bar 7b2) is substantially blocked and maintained.
Therefore, in the laser processing performed after the bar holder 7a is lowered to the lowest position, it is possible to effectively prevent the laser light LT from leaking from the inside of the partition 3 to the outside.
Further, the light shielding bar 7b1 does not rotate but moves up and down in the vertical plane together with the light shielding bar 7b2, and the light shielding bar 7b1 contacts the upper surface Wa of the workpiece W. For this reason, the gap M3 is satisfactorily closed regardless of the height H1 of the workpiece W, and leakage of the laser light to the outside is prevented.

When the laser processing is completed and the next repositioning operation is executed, the control unit SG stops the emission of the laser light, operates the air cylinder 6 again, and shortens the rod 6a to the shortest.
As a result, the light-shielding portion 7 moves up and stands by at the uppermost position shown in FIG. 3, during which the next positioning of the workpiece W is executed.

  As described above, the control unit SG performs laser processing by emitting laser light from the head unit 4 only when the bar holder 7a is at the lowermost position. When the bar holder 7a is not at the lowermost position, the laser beam is emitted. Control is performed so as not to emit light.

  By the way, the light-shielding part 7 having two rows of A and B rows by the light-shielding bar 7b shown in FIG. 4 is incident in parallel to the extending direction of the table 2 (vertical direction in FIG. 6) as described above. Although the passage of the laser beam LT is prevented, a part of the laser light LT may pass depending on the incident angle and position thereof.

In FIG. 5 referred to above, a tangent LN1 between one light shielding bar 7b3 in the A row and one side (left side in FIG. 5) of the light shielding bar 7b4 adjacent to the B light shielding bar 7b3, and the light shielding bar 7b3. A tangent line LN2 between the light shielding bar 7b5 in the A row adjacent to one side of the light shielding bar 7b6 and the light shielding bar 7b6 in the B row adjacent to the other side is set.
The angle formed between the tangent line LN1 and the parallel line LNh parallel to the center line CL7a is defined as an angle θ1, and the angle formed between the tangent line LN2 and the parallel line LNh is defined as an angle θ2.
At this time, the laser light LT2 incident on the light shielding unit 7 at an angle θ3 between the angle θ1 and the angle θ2 passes through the gap between the light shielding bars 7b of the B row and the A row and leaks to the outside depending on the incident position. .
The amount of the laser beam LT2 is a small amount because the incident angle and the incident position are limited within a narrow range, based on the total amount of the laser beam to be prevented from leaking.
If the leakage light due to the laser beam LT2 is not ignored due to the use conditions of the laser processing machine 51, the position of the head moving area AR may be limited as described below in order to further enhance the blocking effect.

FIG. 7 is a schematic plan view for explaining the positional relationship between the light shielding unit 7 and the head moving area AR.
Boundary lines LN1a and LN1b corresponding to the tangent line LN1 shown in FIG. If the angle at which the laser beam LT7 emitted from an arbitrary position in the head moving area AR is incident on the light shielding portion 7 is set to an angle θ7 as shown in FIG. 5, if the angle θ7 is larger than the angle θ1, the light shielding portion 7 It always comes into contact with the light shielding bars 7b of the B row and the A row.
Therefore, if the head movement area AR is set in a range (stipple range) AR7 farther from the light shielding portion 7 than the intersection P7 of both lines in the range between the boundary line LN1a and the boundary line LN1b, the head portion Even if the laser beam LH of No. 4 executes laser processing at any position in the head movement area AR, all the laser light LT7 from the laser head LH hits the light shielding bar 7b of the light shielding part 7, and therefore, the laser light LT7 is leaked outside. It can prevent more reliably.

  Further, part of the laser light emitted from the laser head LH of the head unit 4 is reflected on the inner surface of the partition 3, the workpiece W, the table 2, etc., and diffused laser light is generated. The intensity of the diffused laser light is extremely small compared to the direct light. However, if the leakage of the diffused laser light cannot be ignored, the leakage can be reduced by using the light-shielding portion 7 as modified examples 1 and 2 below. Furthermore, it can prevent reliably.

<Modification 1>
FIG. 8 is a schematic plan view for explaining a first modification of the light shielding portion 7. FIG. 8 corresponds to FIG. 5, and more specifically, is an example in which the C column is added to the A column and the B column shown in FIG.
First, consider the case where there is no column C in FIG. 8 (corresponding to FIG. 5).
Similarly to the case described with reference to FIG. 5, the tangent line LN1, the line symmetric tangent line LN11 corresponding thereto, the tangent line LN2, and the line symmetric tangent line LN22 corresponding thereto are set.
Further, an intersection point P8 between the tangent line LN1 and the tangent line LN2 and an intersection point P88 between the tangent line LN11 and the tangent line LN22 are set.

  In this case, a part of the laser light passing through the region AR8 (stipple) between the tangent LN1 and the tangent LN2 and the laser light passing through the region AR88 (stipple) between the tangent LN11 and the tangent LN22 are A It passes between the light shielding bars 7b in the rows and B rows and leaks to the outside. For example, laser light LT8 that passes through at least the intersection point P8 in the laser light that passes through the area AR8 and laser light LT88 that passes through at least the intersection point P88 out of the laser light that passes through the area AR88 leaks to the outside.

Therefore, the light shielding bar 7c is installed so as to divide the area AR8 and also divide the area AR88.
In this example, a light shielding bar 7c having a diameter 1.25 times the light shielding bar 7b of the A row and the B row is arranged on the center line CL7c parallel to the center line CL7b and 1.25 times the distance Da. A plurality of C rows are provided at the same pitch P1 and in synchronized positions.
According to the first modification, since the light shielding bar 7c divides the region AR8 and the region AR88, the C row, the B row, or the A row can be obtained regardless of the angle at which the laser light is incident on the light shielding portion 7. It cannot hit the light shielding bars 7c, 7b and pass through the light shielding portion 7. Therefore, leakage of laser light to the outside can be surely prevented.

<Modification 2>
FIG. 9 is an example in which the light shielding bars 7b in the A and B rows are light shielding bars 77 that are flat rectangular bars instead of round bars in the first modification shown in FIG.
The light shielding bars 77 in the A row are arranged in parallel at a predetermined pitch P77 so that a gap M77 is formed between the adjacent light shielding bars 77 with the longitudinal direction of the light shielding bars 77 being along the center line CL77 of the A row. .
The light shielding bars 77 in the B row close the gap M77 in the A row, and are arranged in parallel at a pitch P77 in the same posture as the A row at a position shifted from the A row by a half pitch in the direction of the center line CL77.
The light shielding bars 78 in the C row are arranged in parallel at a pitch P77 at positions facing the light shielding bars 77 in the B row. The installation position and diameter of the light shielding bar 78 are set as follows.

In FIG. 9, one corner K1 on the B row side of the one light shielding bar 77a in the A row (left side in FIG. 9) and the light shielding bar in the light shielding bar 77b of the B row facing the light shielding bar 77a on one side. A tangent line LN77a connecting the corner K2 close to 77a is set.
Further, of the corners of the light shielding bar 77c of the A row adjacent to the light shielding bar 77a on one side, the corner K3 close to the light shielding bar 77a on the side opposite to the B row is opposed to the light shielding bar 77a on the other side. A tangent line LN77b that connects a corner K4 close to the light shielding bar 77a on the side opposite to the A row among the corners of the light shielding bar 77d of the B row to be set is set.
Similarly, the tangent lines LN77a and LN77b and the tangent lines LN77c and LN77d that are axially symmetric with respect to the center line CL9 of the light shielding bar 77d are set.

In this case, a part of the laser light passing through the area AR9 (stipple) between the tangent LN77a and the tangent LN77b and the laser light passing through the area AR99 (stipple) between the tangent LN77c and the tangent LN77d are A It passes between the light shielding bars 77 in the row and row B and leaks to the outside. Of the laser light passing through the area AR9, at least the laser light passing through the intersection P9 of both tangents, and among the laser light passing through the area AR99, the laser light passing through at least the intersection P99 of both tangents leaks to the outside.
Therefore, a light shielding bar 78 that divides the area AR9 and also divides the area AR99 is provided. That is, the diameter and the arrangement position are set so as to include the shape of the region where the region AR9 and the region AR99 intersect.

  According to the second modification, no matter what angle the laser beam is incident on the light shielding portion 7, it strikes the light shielding bar 78 in the C row or the light shielding bar 77 in the B row or the A row, and thus passes through the light shielding portion 7. I can't. Therefore, leakage of laser light to the outside can be surely prevented.

  The embodiment of the present invention is not limited to the above-described configuration, and may be another modified example without departing from the gist of the present invention.

The light shielding bar 7b and the light shielding bar 77 are not limited to round bars and strips having a rectangular cross section.
The drive source for raising and lowering the light shielding unit 7 is not limited to the air cylinder 6 and various drive devices can be applied.
The rows of the light shielding portions 7 are not limited to two rows and three rows, and may be four or more rows. The arrangement pattern is not limited, and may be set as appropriate according to the shape and size of the light shielding bars 7b and 77.

DESCRIPTION OF SYMBOLS 1 Rail base 2 Table, 2a Upper surface 3 Partition, 3a Sliding door, 3a1, 3La1 Viewing window 3b Wall part, 3c1 Hinge 3L, 3R Door 4 Head part 5 Drive part 6 Air cylinder, 6a Rod 7 Light-shielding part, 7a Bar holder, 7a1 Through hole, 7a2 Upper surface 7b, 7b1, 7b2, 77, 77a to 77d, 78 Shading bar 7bf Flange, 7bs Tip surface 8 Operation panel 51 Laser processing machine AR, AR8, AR88, AR9, AR99 Head movement area CL7a, CL7b, CL77 , CL9 Center line Da Diameter FL Floor K1-K4 Corners L1, L2, H1, H2, H3, H3a Distance LH Laser head, LK Laser processing parts LN1, LN2, LN1a, LN1b, LN11, LN22,
LN77a to LN77d Tangential line, LNh Parallel line LS Laser beam blocking unit LT, LT2, LT7, LT8, LT88 Laser beam M2, M3, M77 Gap P1, P77 Pitch, P2, P3, P8, P88, P9, P99 Intersection SA Operating unit SG Control part W Workpiece, Wa Upper surface θ1-θ3, θ7 Angle

Claims (6)

A table capable of reciprocating in one direction;
A laser processing unit having a laser head for performing laser processing on the workpiece placed on the table;
A partition having an opening through which the table enters and exits in the one direction and encloses the laser processing unit;
A laser light blocking unit that blocks laser light that is directed to the outside through the opening during laser processing of the workpiece by the laser head;
A laser processing machine equipped with
The laser beam blocking unit is
The light-shielding member holder having a plurality of through-holes formed above and below the opening and formed in the vertical direction, and the plurality of through-holes are controlled to move downward from a predetermined position and move in the vertical direction. A plurality of bar-shaped light-shielding members inserted in a possible manner,
The laser processing machine, wherein the plurality of light shielding members are arranged so as to overlap each other in at least the one direction so as to close the opening. When the light-shielding member holder has a drive unit that moves up and down, and the table is at the position of the opening,
The opening is closed in at least the one direction by the plurality of light shielding members at a position where the light shielding member holder is lowered,
The laser processing machine according to claim 1, wherein a predetermined gap is formed between the lower end of all the plurality of light shielding members and the table at a position where the light shielding member holder is raised. When the workpiece is placed on the table and is at the position of the opening, and the light-shielding member holder is at a position lowered by the drive unit,
3. The light shielding member at a position corresponding to the work among the plurality of light shielding members contacts the upper surface of the work and closes a range immediately above the work in the opening. The laser processing machine described.   The laser processing according to any one of claims 1 to 3, wherein the plurality of light shielding members are arranged in a predetermined arrangement pattern including a plurality of rows in a direction intersecting with the one direction. Machine. A drive unit for moving the laser head within a predetermined range inside the partition;
The arrangement pattern and the predetermined range are set such that a laser beam emitted from the laser head at an arbitrary position within the predetermined range hits one of the plurality of light shielding members. 4. The laser beam machine according to 4.   The said some light shielding member is formed with the resin material which has the property to absorb the light of the wavelength of the laser beam radiate | emitted from the said laser head, The any one of Claims 1-5 characterized by the above-mentioned. Laser processing machine.

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