JPH033552B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is directed to the processing of a laser processing device that processes a workpiece, such as fabric or leather, by scanning a laser beam. This invention relates to a smoke evacuation device for removing smoke.

[Prior Art] Conventionally, there has been a device of this type as shown in FIG. 3 (Japanese Patent Application No. 10496/1982). In the figure, reference numeral 1 denotes a support stand, and this figure shows the case of a conveyor. A fabric 2, which is a workpiece, is supported on the conveyor 1. Reference numeral 3 denotes a laser beam emitting swing mirror for cutting or otherwise processing the fabric 2 by irradiating the fabric 2 with a laser beam while scanning the fabric 2 two-dimensionally. 4 is a fabric 2 that is installed in the laser processing device and is irradiated with laser light.
a cover 6 that covers the processing section of the processing chamber 5 and forms the processing chamber 5;
is an air blower installed in the processing chamber 5 to generate a ventilation flow (parallel flow A) on the conveyor 1 in the processing chamber 5. This blower device 6 includes an upstream side blower 7 for taking in air B from the outside of the processing chamber 5 and discharging this air to generate a ventilation flow, and an upstream side blower 7 for sucking in this ventilation flow and discharging it to the outside of the processing chamber 5. The downstream side blower 8 is connected to the downstream side blower 8 by a duct 9, and includes an exhaust fan 11 for discharging the exhaust air from the downstream side blower 8 to the outside via a duct 10.

Next, the operation will be explained. First, a ventilation flow (parallel flow A) as shown in FIG. 3 is generated on the conveyor 1 between the upstream side blower 7 and the downstream side blower 8. As shown in FIG. This ventilation flow A needs to be generated as close to the surface of the fabric 2 as possible in order to immediately remove smoke generated from the processed area.
By operating the blowers 7, 8 and the exhaust fan 11, air B outside the processing chamber 5 → upstream fan 7 → ventilation flow A → downstream fan 8 → duct 9 → exhaust fan 11
An air flow such as → duct 10 → exhaust C as shown by the arrow in FIG. 3 is formed. When the laser processing device is operated under this condition and the laser beam is irradiated from the mirror 3 to the fabric 2 on the conveyor 1 while scanning it two-dimensionally, smoke is generated from the processed part of the fabric 2. The smoke is immediately removed from the processing section by the ventilation flow A, and is carried along with the airflow indicated by the arrow in the figure and discharged to the outside of the processing chamber 5 as exhaust gas C.

[Problems to be Solved by the Invention] Since the conventional device is configured as described above, the fabric 2 on the conveyor 1 fluttering due to the airflow flowing along the surface, resulting in highly accurate processing. Not only is this not possible, but in the case of cutting, the fabric that has already been processed will be blown up by the ventilation flow.
There were drawbacks such as covering the part to be processed next, resulting in poor processing. Further, in the above-mentioned conventional system, the amount of ventilation air is large, and when an exhaust gas treatment device is installed, the exhaust gas treatment device has to be large-sized and its operation cost is high.

This invention was made to solve the above-mentioned problems, and it is a laser processing method that fixes the workpiece to a support stand so that it does not move during processing, and can quickly remove the smoke generated. The main objective is to obtain a smoke evacuation device for a laser processing device, and in addition to the above, it is also an object to obtain a smoke evacuation device for a laser processing device that can reduce the amount of exhaust air.

[Means for Solving the Problems] In order to achieve the above-mentioned object, the smoke evacuation device for a laser processing device according to the present invention irradiates a workpiece supported on a support stand with laser light. In a smoke removal device for a laser processing device that processes a workpiece by a blower device (preferably including a circulation device) that generates both a parallel flow and a downward perpendicular flow with respect to the plane of the workpiece. It is equipped with the following.

[Function] In this invention, the blower device generates both a parallel flow and a downward perpendicular flow to the plane of the workpiece on the support table, and the smoke generated from the processing section is transported by the parallel flow and the vertical flow. The workpiece is quickly removed and the workpiece is fixed on the support by the downward vertical flow. Furthermore, when part of the parallel flow and perpendicular flow is circulated across the workpiece, the total displacement is reduced.

[Example] Hereinafter, an example of the present invention will be described with reference to the drawings. In FIG. 1, reference numeral 12 is a mesh conveyor that supports the fabric 2 as a workpiece and has a structure that allows ventilation in the plane direction, and 13 is a suction hood with an open top (on the mesh conveyor side). The upper opening of the suction hood is installed close to the lower surface of the mesh conveyor 12, and is connected to the exhaust fan 11 through a duct 9a. Other symbols and symbols indicate the same or corresponding parts as those in FIG. 3.

Next, the operation will be explained. First, the blower device 6
The fabric 2 supported on the mesh conveyor 12 is operated by operating the upstream side blower 7 and the downstream side blower 8.
The ventilation flow A is generated in the upper part of the exhaust fan 1.
1 to suck a part of the external air B introduced by the upstream blower 7 from the suction hood 13,
A downward vertical flow D is generated on the surface of the fabric 2.
Next, the laser processing device is operated to irradiate the fabric 2 supported on the mesh conveyor 12 with laser light from the mirror 3 while scanning it two-dimensionally. At this time, smoke is generated from the processed portion of the fabric 2, but this smoke is immediately removed by the ventilation flow A and the vertical flow D. Further, the fabric 2, which is the workpiece, is pressed and fixed onto the mesh conveyor 12 by the vertical flow D due to the pressure loss (wind pressure) caused by the air volume of the vertical flow D and the friction of the fabric. Other operations are similar to those shown in FIG. 3 described above.

As described above, according to this embodiment, the smoke generated from the processing section is removed by the ventilation flow A and the vertical flow D, so that the workpiece is fixed on the support table by the vertical flow D, and Since smoke generated during processing can be quickly removed, processing accuracy is improved.

FIG. 2 shows another embodiment. Second
In the figure, reference numeral 14 denotes a top-open type circulation tank, and the top of the circulation tank is installed close to the mesh conveyor 12. Further, a suction port of an upstream blower 7 is connected to one side of the circulation tank 14, and a discharge port of a downstream blower 8 is connected to the other side facing each other. is circulated by an upstream blower 7 and a downstream blower 8.

Other symbols and symbols indicate the same or corresponding parts as in FIG. 3.

Next, the operation will be explained. First, the upstream side blower 7, the downstream side blower 8, and the exhaust fan 11 of the blower device 6.
is operated to generate a parallel flow A and a downward vertical flow D on the surface of the fabric 2, which is the workpiece supported on the mesh conveyor 12.
A part of the circulating air is discharged as exhaust gas C to the outside of the processing section 5 through the duct 10 by an exhaust fan 11 connected to the processing section 4 by a duct 9. This exhaust air volume is the introduction air volume of the introduced air B supplied from the slit 15 provided at the upper part of the cover 4, and is the air volume in the direction perpendicular to the surface of the fabric 2. Next, the laser processing device is operated to irradiate the cloth 2 on the mesh conveyor 12 with laser light while scanning it two-dimensionally from the mirror 3. At this time, smoke is generated from the processed portion of the dough 2, but this smoke is immediately removed from the processed portion by the parallel flow A and the perpendicular flow D.
sucked inside. The air in the circulation tank is removed by an exhaust fan 11.
It is discharged to the outside as exhaust gas C, but a part of it is circulated as parallel flow A by the upstream blower 7. Further, the amount of air discharged as exhaust gas C is the same as the amount of air newly sucked in as air B from the slit 15.

In addition, in the above-described embodiment, in order to generate the parallel flow A, the upstream side blower 7 and the downstream side blower 8 were used, but the same effect can be achieved even if only one of the blowers is used. In addition, in order to release the exhaust gas C to the outside, an exhaust fan 11 was installed at the rear of the circulation tank 14.
A blower is installed in the cover 4, and the slit 15 is closed to allow the introduced air B to flow into the processing chamber 5 using the blower.
A similar effect can be obtained by blowing the air into the inside. These modifications may be appropriately selected depending on the air permeability of the processed fabric, processing details (surface roughening processing, cutting processing), and the like.

Further, in the above embodiment, a mesh conveyor is used as the support, but the support can also be constructed with a structure that allows ventilation to the plane of the support, such as a honeycomb type or a fin type.

[Effects of the Invention] As described above, according to the present invention, since the smoke generated from the processing part is removed by the parallel flow A and the downward flow (vertical flow D), the generated smoke can be quickly removed. In addition to being able to be removed, the workpiece is fixed to the support table by the vertical flow D, improving machining accuracy.

In addition, in this invention, the parallel flow A can be used for circulation, so in this case, the total exhaust volume can be reduced, and when a gas treatment device is attached to the subsequent stage of this invention, the processing air volume can be reduced. It has extremely great effects, such as reducing the amount of electricity and making it more compact.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a smoke exhaust device for a laser processing device showing one embodiment of the present invention, FIG. 2 is a configuration diagram of a smoke exhaust device for a laser processing device showing another embodiment, and FIG. 3 is a configuration diagram of a smoke exhaust device for a laser processing device showing another embodiment. It is a block diagram of the smoke exhaust device for laser processing equipment. In the figure, 2 is the fabric, 3 is the mirror, 4 is the cover, 5 is the processing room, 6 is the blower, 7 is the upstream side blower, 8 is the downstream side blower, 9, 9a, 10 are the ducts, and 11 is the exhaust blower. , 12 is a mesh conveyor, 13 is a suction hood, and 14 is a circulation tank.

Claims (1)

[Claims] 1. In a smoke exhaust device of a laser processing device that processes a workpiece supported on a support table by irradiating the workpiece with laser light, 1. A smoke evacuation device for a laser processing device, characterized in that it is equipped with a blowing means for generating a parallel flow and a perpendicular flow in a direction that presses a workpiece against a support table. 2. The smoke evacuation device for a laser processing apparatus according to claim 1, wherein the blowing means includes a circulation means for circulating part of the parallel flow and the vertical flow.