JP3673639B2 - Dust collector for laser processing machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a laser processing machine that processes a long strip-shaped workpiece with a laser beam, such as a laser aperture device that continuously opens a cigarette filter paper with a laser beam at a predetermined interval. The present invention relates to a dust collector for a laser beam machine that collects fine dust generated by the laser beam machine.
[0002]
[Prior art]
Conventionally, for example, there is a laser opening device shown in FIG. In the figure, a is a pulse laser oscillator, and a pulsed laser beam output from the pulse laser oscillator a is reflected downward by a reflecting mirror b and guided to a condenser lens c. The beam is focused. On the other hand, d is a long strip-like workpiece (hereinafter referred to as the original fabric) such as a cigarette filter paper, and this original fabric d passes through the focal position of the laser beam focused by the condenser lens c. The tension roller e travels in the direction of arrow T on the light receiving table f as a surface plate. Thus, openings are continuously formed in the original fabric d at a predetermined interval corresponding to the pulse interval of the laser beam and the traveling speed.
[0003]
The light receiving table f is hollow and has a slit g formed in a portion in contact with the original fabric d, and is exhausted from an exhaust port h. As a result, the original fabric d is sucked at the slit g to cause the original fabric d to travel stably at a fixed position, and the combustion residue of the original fabric d passes through the slit g. In addition, a nozzle j is formed at the lower end of the holding cylinder i holding the condenser lens c, and a processing gas introduction port k is formed in the holding cylinder i, and the processing gas is introduced from the processing gas introduction port k. Thus, dry air is ejected from the nozzle j, thereby protecting the condenser lens c from the combustion residue of the original fabric d.
[0004]
[Problems to be solved by the invention]
In such a laser aperture device, fine dust such as combustion debris is clouded when the aperture is formed in the raw fabric d, but a part of the dust is removed from the exhaust port h through the slit g. However, the combustion debris until the opening is penetrated, particularly, is scattered on the reflecting mirror b, the condenser lens c, the holding cylinder i, and the nozzle j side. On the other hand, in the above-mentioned conventional apparatus, the condensing lens c is protected by ejecting dry air from the nozzle j, but conversely, the combustion debris is further clouded by the ejected air, The surroundings and the original fabric itself may be soiled, or the optical system other than the condenser lens c may be adversely affected. Therefore, it is required to remove the combustion residue as described above.
[0005]
Further, as disclosed in Japanese Patent Laid-Open No. 5-138382, a laser beam scanned by a rotating polyhedral mirror is divided into a plurality of parts, and each of the divided laser beams is used for opening processing. An apparatus that enables processing has been proposed. However, when the processing speed is increased, the amount of combustion debris generated in the original fabric increases as described above. It is required to do.
[0006]
It is an object of the present invention to provide a dust collector capable of efficiently collecting combustion residue, that is, fine dust, of a workpiece generated by a laser processing machine that processes a long strip-shaped workpiece with a laser beam.
[0007]
[Means for Solving the Problems]
A dust collector for a laser beam machine according to a first aspect of the present invention is configured to cause a long strip-shaped workpiece to travel in the longitudinal direction of the workpiece on the surface plate, and the workpiece on the surface plate. A laser for irradiating a laser beam toward an opening formed in a surface covered with a laser and processing the workpiece by the laser beam and collecting dust generated in the vicinity of the surface plate A dust collector for a processing machine, wherein the duct is connected to the opening of the surface plate and is formed on the opposite side of the work surface of the surface plate, and the work plate side of the surface plate has the work surface. and a traveling direction while disposed in the air intake port of each side of the workpiece facing in a direction crossing and the other to be disposed the outlet of the workpiece, the air flow generated inside the duct The inlet is communicated with the downstream side of the duct with respect to the direction, and the upstream side of the duct The exhaust port is communicated, together with generating the air flow by sucking in the duct into the duct, the part of the air flow in the duct so as to generate a gas stream toward the intake port from the exhaust port It is characterized by.
[0012]
According to the laser processing machine for dust collector of Claim 1 as constructed above, the speck near the opening, can be collected dust through the duct by the air flow in the duct. Further, fine dust on the laser beam irradiation surface side can be collected through the air intake port by an air flow from the air exhaust port to the air intake port. Furthermore, it is possible to generate an air flow from the exhaust port to the intake port only by sucking the inside of the duct and generating an air flow in the duct, and the configuration is simplified.
[0015]
According to a second aspect of the present invention, there is provided a dust collector for a laser beam machine having the structure of the first aspect , wherein a part of an air flow inside the duct is provided inside the duct where the exhaust port communicates with the duct. A damper is provided on the exhaust port side to separate the damper.
[0016]
According to the dust collector for a laser beam machine of claim 2 configured as described above, in addition to the function and effect of claim 1 , a part of the airflow inside the duct can be reliably separated to the exhaust port side. it can. Further, the airflow from the exhaust port to the intake port and the airflow in the duct can be set by the shape and position of the damper, for example, so that the relationship between the two strengths is a predetermined relationship, The relationship can be kept stable. Therefore, for example, stable running of the workpiece is ensured.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 3 is a perspective view of a main part of a laser hole drill provided with a dust collector for a laser beam machine according to an embodiment of the present invention, and a cigarette filter paper (chip paper) as a long strip-shaped workpiece. A number of fine holes are formed in this chip paper. The fine holes formed in the chip paper are intended to reduce the taste by diluting the mainstream smoke of cigarettes with external air during smoking.
[0018]
When producing cigarettes, a long chip paper is cut to a length slightly longer than the outer circumference of the filter to form a piece of chip paper, and two cigarette windings (both sides) are attached to one filter chip. Two filter cigarettes are integrally manufactured by winding this filter chip portion with one chip paper piece together with a part of the cigarette winding. For this reason, two sets of aperture rows are formed in one chip paper corresponding to two cigarettes. In addition, the laser aperture machine in this embodiment enables two rows of apertures to be formed in a filter for one cigarette, and chip paper has a total of 4 rows of apertures of 2 rows x 2 groups. It comes to form.
[0019]
A laser beam L is continuously generated in the X direction from the laser source 1 and focused by the condenser lens 2. The converging laser beam L is incident on a polygon mirror (polyhedral mirror) 4 that is rotated 90 degrees in the Y direction by the mirror 3 and rotated by the air spindle motor 5. The laser beam L input to the polygon mirror 4 is deflected with the rotation of the polygon mirror 4 and directed toward the condenser lens 6.
[0020]
The condenser lens 6 is provided as an fθ lens, and the deflection angle of the laser beam L deflected by the polygon mirror 4 changes as the polygon mirror 4 rotates, but the laser beam transmitted through the condenser lens 6 is The emission position is always kept parallel to the optical axis of the condenser lens 6 only by moving in the Z direction on the surface of the condenser lens 6. That is, a laser beam that moves in parallel as indicated by the arrow (1) in the figure as the polygon mirror 4 rotates is input to the reflection mirror 7.
[0021]
The laser beam reflected by the reflecting mirror 7 is directed to the first two-divided pair mirror 8, and the first two-divided mirror 8 causes the laser beam from the reflecting mirror 7 to be negative in the Z axis according to its optical path. Reflected as laser beams L1 and L2 in the direction (downward in the figure) and reflected as laser beams L3 and L4 in the positive direction (upward in the figure). The laser beams L1 and L2 are directed to the second split mirror 9, and the laser beams L3 and L4 are directed to the third split mirror 10, respectively.
[0022]
The second split mirror 9 reflects the laser beam L1 from the first split mirror 8 in the negative direction of the Y axis (left direction in the figure) and enters the first laser irradiation unit 11 so that the laser beam The beam L2 is reflected in the positive direction of the Y axis (the right direction in the figure) and is incident on the second laser irradiation unit 12. The third split mirror 10 reflects the laser beam L3 from the first split mirror 8 in the positive direction of the Y axis and enters the third laser irradiating unit 13, and the laser beam L4 is input to the Y axis. It is reflected in the positive direction and enters the fourth laser irradiation unit 14.
[0023]
That is, the laser beam emitted from the condenser lens 6 and scanned in parallel as indicated by the arrow (1) is irradiated with the first laser as the laser beam L1 in the first quarter of the scanning range. The light is incident on the part 11 and is incident on the second laser irradiation part 12 like the laser beam L2 in the next quarter range. Further, in the next quarter range, the laser beam L3 is incident on the third laser irradiation unit 13, and in the last quarter range, the fourth laser irradiation unit is formed like the laser beam L4. 14 is incident.
[0024]
Each laser irradiation unit 11, 12, 13, and 14 includes two parallel reflectors 11a, 12a, 13a, and 14a and two condenser lenses 11b, 12b, 13b, and 14b. L2, L3, and L4 are reflected by the parallel reflectors 11a, 12a, 13a, and 14a, and condensed by the condenser lenses 11b, 12b, 13b, and 14b, and irradiated onto the chip paper 15.
[0025]
The chip paper 15 is drawn from a feeding-side bobbin (not shown) to a winding-side bobbin. This chip paper 15 is arranged so as to surround the above optical system in a “U” shape by a tension roller 16 indicated by a two-dot chain line, and is driven in the direction of arrow T in the figure by a driving device (not shown). The A dust collection unit 20 facing the chip paper 15 is provided corresponding to each of the laser irradiation units 11, 12, 13, and 14. In FIG. 3, the dust collecting unit 20 is omitted from the portion corresponding to the laser irradiation units 11, 12, and 13 by a two-dot chain line, but has the same configuration as the dust collection unit 20 corresponding to the laser irradiation unit 14. It has become.
[0026]
FIG. 1 is a cross-sectional view of the dust collection unit 20, and FIG. 2 is a front view of the dust collection unit 20. 1 is a cross-sectional view taken along the line PP in FIG. The dust collecting unit 20 forms a duct 22 having a rectangular parallelepiped cavity on the back surface of the surface plate 21 in which the chip paper 15 is slidably contacted, and the direction perpendicular to the longitudinal direction of the chip paper 15 of the duct 22 is an axis. A suction pipe 23 and a suction pipe 24 are attached. The surface plate 21 is formed with a plurality of openings 25 that are continuous with the traveling direction (longitudinal direction) of the chip paper 15 at the positions of the openings formed in the chip paper 15. Further, the position of the opening 25 is irradiated with a laser beam L for forming an opening in the chip paper 15. Although the openings 25 are formed in two rows, there is only one position where the laser beam L is irradiated, and this irradiation position is set according to the four laser irradiation sections 11, 12, 13, and 14, respectively. ing.
[0027]
On the surface plate 21, an intake side hood 26 and an exhaust side hood 27 are formed at positions on both sides of the chip paper 15, and a portion of the surface plate 21 covered with the intake side hood 26 and the exhaust side hood 27 is formed. Openings 21a and 21b are formed, and the insides of the intake side hood 26 and the exhaust side hood 27 are communicated with the duct 22 through the openings 21a and 21b. A rectangular intake port 26a having a running direction as a longitudinal direction is formed on the tip paper 15 side of the intake side hood 26. Similarly, a rectangular exhaust port having a running direction as a length is formed on the tip paper 15 side of the exhaust side hood 27. 27a is formed. Further, side walls 26b and 27b are formed below the intake port 26a and the exhaust port 27a so as to stand from the surface plate 21 and extend in the longitudinal direction of the chip paper 15. Further, in the duct 22 below the exhaust side hood 27, there is disposed a damper 28 that is suspended from the back surface of the surface plate 21 and diagonally faces both the suction pipe 24 and the opening 21b.
[0028]
As shown in FIG. 3, a suction pipe 31 is connected to the suction pipe 24, and the other end of the suction pipe 31 is open to the atmosphere. A suction pipe 32 is connected to the suction pipe 23, and the other end of the suction pipe 32 is connected to the dust collection tank 40 shown in FIG. 4B is a cross-sectional view taken along the line QQ in FIG. The dust collection tank 40 has a cylindrical sealed container 41 as a main body case, and a cylindrical filter 42 is disposed inside the sealed container 41. This filter 42 divides the inside of the sealed container 41 into two dust collection chambers 43 and suction chambers 44, and the dust collection chamber 43 includes four suction pipes 32 connected to the four dust collection portions 20, respectively. The suction connection pipe 45 communicates with the suction connection pipe 45. The suction chamber 44 is in communication with the suction tube 46. The suction pipe 46 is connected to a suction device (not shown), and the suction device is driven when the chip paper 15 is subjected to opening processing, so that the inside of the dust collection tank 40 is sucked.
[0029]
With the above configuration, as indicated by an arrow in FIG. 1, an air flow A is formed in the duct 22 by the air sucked from the suction pipe 24. Further, the air sucked from the suction pipe 24 is guided into the exhaust side hood 27 by the damper 28, and is exhausted above the tip paper 15 from the exhaust port 27 a of the exhaust side hood 27. On the other hand, the air above the tip paper 15 is sucked from the suction port 26 a of the suction side hood 26 by the suction force from the suction pipe 23. Thereby, an airflow B is formed above the chip paper 15.
[0030]
Therefore, when forming a hole in the chip paper 15, combustion debris and combustion gas that are scattered particularly on the irradiation side of the laser beam L are sucked into the suction pipe 23 by the airflow B through the intake side hood 26. In addition, the combustion residue and combustion gas that are scattered in the duct 22 are sucked into the suction pipe 23 by the air flow A. The combustion debris and combustion gas sucked by the suction pipe 23 are sucked into the dust collection tank 40, and the combustion debris sucked in the dust collection tank 40 are collected in the dust collection chamber 43.
[0031]
In this way, the combustion debris and the combustion gas that are scattered on the both sides of the chip paper 15 are sucked by the airflows A and B, so that the combustion debris and the like can be collected efficiently. In addition, since the airflow B does not directly hit the chip paper 15 by the side walls 26b and 27b provided upright on both sides of the chip paper 15, there is no hindrance to the stable running of the chip paper 15.
[0032]
Note that the pressures on the front and back sides of the chip paper 15 differ depending on the flow rates of the airflows A and B, but the flow rates of the airflows A and B are such that the chip paper 15 can travel while being sucked by the surface plate 21. As such, it is set in advance. This flow rate is set by the shape and size of the duct 22, the intake side hood 26, the exhaust side hood 27, the damper 28, the opening 25, and the angle of the damper 28.
[0033]
In the above embodiment, the intake side hood 26 ( and the intake port 26 a) and the exhaust side hood 27 (and the exhaust port 27 a) are connected to the duct 22, thereby forming the airflow B together with the airflow A by the same suction source as the duct 22. However, the air flow A is formed separately from the air flow A without connecting the intake side hood 26 (and the intake port 26a) and the exhaust side hood 27 (and the exhaust port 27a) to the duct 22. May be.
[0034]
Further, according to the embodiment, the dust collection efficiency is increased by the air flow A of the duct 22, but the dust collection effect can be obtained only by the air flow B formed on the top of the chip paper 15 without the duct 22 and the air flow A. It is done.
[0035]
In the above embodiment, chip paper has been described as an example of the workpiece, but it goes without saying that it can be applied to other long strip-like workpieces such as filter openings.
[0036]
【The invention's effect】
As described above, according to the dust collector for a laser beam machine according to claim 1 of the present invention , the airflow from the exhaust port to the intake port and the airflow in the duct with respect to the fine dust on the laser beam irradiation surface side With these two airflows, fine dust on both sides of the workpiece can be collected, so that fine dust such as combustion debris can be collected efficiently. Further, by simply sucking the inside of the duct and generating an air flow in the duct, an air flow from the exhaust port to the intake port can also be generated, and the configuration is simplified.
[0040]
According to the dust collector for a laser beam machine of claim 2 of the present invention, a part of the airflow inside the duct can be reliably separated to the exhaust port side. In addition, the airflow from the exhaust port to the intake port and the airflow in the duct can be set by the shape and position of the damper, for example, so that the relationship between the two strengths is a predetermined relationship. Since the relationship can be kept stable, stable running of the workpiece is ensured.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a dust collection unit according to an embodiment of the present invention.
FIG. 2 is a front view of the dust collecting unit.
FIG. 3 is a perspective view of a main part of a laser processing machine provided with the dust collection unit.
FIG. 4 is a bottom view and a cross-sectional view of a dust collection tank according to the embodiment.
FIG. 5 is a diagram showing an example of a conventional laser aperture device.
[Explanation of symbols]
15 Chip paper 20 Dust collector 21 Surface plate 22 Duct 26 Intake side hood 26a Intake port 27 Exhaust side hood 27a Exhaust port

Claims (2)

A long strip-shaped workpiece is run on the surface of the workpiece in the longitudinal direction of the workpiece, and a laser beam is directed toward an opening formed on the surface of the surface plate covered with the workpiece. A dust collector for a laser processing machine that is disposed in a laser processing machine that irradiates and processes the workpiece with the laser beam, and that collects fine dust generated near the surface plate,
A duct that communicates with the opening of the surface plate and is formed on the side opposite to the workpiece of the surface plate, and a direction that intersects the traveling direction of the workpiece on the workpiece side of the surface plate in face-to-face and a workpiece while disposed in the air intake port and the other to be disposed exhaust ports on either side of,
With reference to the direction of the airflow generated inside the duct, the intake port communicates with the downstream side of the duct, and the exhaust port communicates with the upstream side of the duct,
A laser processing machine characterized in that the inside of the duct is sucked to generate an air flow in the duct, and a part of the air flow in the duct is generated as an air flow from the exhaust port to the intake port. Dust collector. 2. The laser processing according to claim 1, further comprising: a damper that separates a part of the airflow inside the duct to the exhaust port side inside the duct that communicates with the exhaust port and the duct. Dust collector for machine.

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