JPS6120680A - Laser drilling device - Google Patents

Abstract

PURPOSE:To provide the titled device making safe with making the adhesion of burn residues difficult and stabilizing the drilling quality by pulse laser beam by providing an air blow nozzle which is for slant upward in the reverse direction to the travelling of the material to be worked at the lower part of the attracting slit of the surface plate which is under the travelling material to be worked. CONSTITUTION:The smoke caused when drilled with the pulse laser beam 7 of the travelling material 1 to be worked is discharged with the attraction from the slit 6 of a surface plate 5. The drilling burn resides are removed by the attraction and further blown away by the jet of the air blow nozzle 9 which is for slant upward in the reserse direction to the travelling material 1 to be worked of the lower part of a slit 6 for difficult adhesion of the burn residues and the combusion of the remaining burn residues is prevented and also the drilling quality is made better and stable.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a pulsed laser beam to continuously form holes at predetermined intervals in a long strip-shaped workpiece (hereinafter referred to as a raw material), such as cigarette filter wrapping paper. The present invention relates to a laser hole drilling device for providing holes.

A conventional device of this type is shown in FIG. In the figure, (1) is the original fabric, (2) is a drive device operated by a feeder (not shown) that continuously feeds the original fabric (1) in the direction of the arrow, and (3) is the raw material during laser processing. (4) is the exhaust port from the smoke exhaust box (3), (5) is the surface plate, (6) is the sulin installed on the surface plate (5), (71) is a laser head that is placed opposite the slit (6) and that focuses and outputs a pulsed laser beam.In such a laser hole-opening device, an efficient CO2 Hals laser is usually used as the laser. ,
This is focused by the lens in the laser head (7) and the focal point is 1.
At around 6, holes are made in the original fabric +1). In addition, since the original fabric (1) is long, it has poor tonality.

In order to keep the relative positional relationship between the web (1) and the laser head (7) constant while it is running, the driving device (2) applies a constant tension at normal pressure. It can be run on the board (5). In addition, a slit (6) is provided on the surface plate (5) at a position facing the laser head ()), and an exhaust port (4) communicating with the smoke exhaust box (3) at the bottom of the surface plate (5) is provided. By operating the exhaust.

The raw fabric (1) is placed on the surface plate (5) with negative pressure on the slit (6) side.
The shape of this slit (6) should be a long groove in the direction perpendicular to the running direction of the web (1), especially when the web (1) is running stably. It is known that this method is effective for thin materials and materials that tend to shrink in the direction perpendicular to the running direction. Furthermore, the slit (6) provided in the surface plate (5) is configured so that the laser beam that did not contribute to the opening and the debris (burnt residue) caused by thermal decomposition of the original fabric (1) can easily pass through. There is.

In the conventional apparatus configured in this way, the original fabric (1) is moved in the direction of the arrow by the drive device (2).

A pulsed laser is irradiated from a laser head (7), and holes are formed at continuous predetermined intervals. Further, during this hole-opening work, exhaust is performed through the exhaust port (4).

Since the conventional laser perforation device is configured as described above, the burnt residue generated when perforating the original fabric (1) is transferred to the slit (
6) and grows on both sides (especially the downstream side), the burnt residue will block the slit (6), causing the slit (
6) There was a problem in that the laser beam would hit the cinders that were blocked, posing a risk of fire.

In addition, the burnt residue also grows in the upper part of the slit (6) and enters between the surface plate (5) and the original fabric (1), contaminating the product, lifting the original fabric +1), and changing the position of the laser elongation point. There was a drawback that the quality of opening holes in the original fabric (1) was affected. In order to prevent these problems, it is necessary to frequently clean the vicinity of the slit (6), which has the drawback of poor workability.

This invention was made in order to eliminate the drawbacks of the above-mentioned conventional ones, and includes an air blow nozzle that blows compressed air through a slit near the opening position of the original fabric (1).
Safe and efficient way to prevent burnt debris from adhering to the slit.
Moreover, it is an object of the present invention to provide a laser hole punching device that can provide stable hole punching quality.

An embodiment of the present invention will be described below with reference to FIG.

In the figure, (8) is a compressed air introduction pipe, and (9) is a surface plate (
This is an air blow nozzle installed near the opening position of the slit (6) in 5), and compressed air is passed through the compressed air introduction pipe (8) from the air blow nozzle (9) to the laser opening position. It is injected in a direction opposite to the running direction A of the raw fabric (1). Therefore, it falls through the opening and slits (6
) is blown away by compressed air from the air blow nozzle (9) and discharged from the smoke box (3) via the exhaust port (4). In FIG. 2, the same or equivalent parts as those of the conventional device shown in FIG. 1 are not given the same reference numerals.

In the laser hole drilling apparatus configured in this manner.

Cut cigarette filter wrapping paper (chip paper) into raw material (1
), and as a result of applying air blow, it was necessary to clean the burnt residue every 15 minutes when there was no air blow, but when air blow was used, there was almost no need for cleaning. Table 1 shows the conditions for the results of this experiment.

Table 1 It should be noted that even if compressed air is blown from the air blow nozzle (9), the burnt residue gradually spreads through the slit (6).
), so it is necessary to clean it regularly, but if you increase the pressure several times the compressed air and inject it from the nozzle (9) during non-operation (during non-opening operation).

The accumulated cinders are instantly blown away and the slit (6) can be easily cleaned. Furthermore, during hole-opening operation, it is necessary to always supply air at an appropriate pressure so that the original fabric (1) is not lifted up by the pressure of compressed air from the nozzle (9).

Although chip paper was used as the perforated material in the above embodiments, it is also possible to use a workpiece that leaves no residue (burnt residue) even after thermal decomposition, such as cloth, composite materials, etc. is not a CO2 laser, but other gas lasers,
Alternatively, the same effect can be achieved even when a laser such as a YAG laser is used.

As described above, according to the present invention, since an air blow nozzle is provided that blows compressed air through the slit to the vicinity of the opening position of the workpiece, it is possible to prevent burnt debris from becoming trapped and to ensure safety. This has the effect of making it possible to perform laser hole drilling efficiently and with stable hole quality.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional (fi1) view of a conventional laser hole drilling device. FIG. 2 is a cross-sectional side view of a laser according to an embodiment of the present invention. (1)... Workpiece, (2)... Drive device, (3)
...Smoke exhaust box, (4)...Exhaust port, (5)...
・Surface plate, (6)... Surin), +71... Laser head, (8)... Compressed air introduction pipe, (9)... Air blow nozzle. In addition, in 1 figure, the same reference numerals indicate the same or equivalent parts.

Claims (3)

[Claims] (1) A laser head that focuses and outputs a pulsed laser beam, a feeding device that continuously drives a long strip-shaped workpiece in which an opening is formed by the laser beam from the laser head, and the laser head A surface plate is provided with a slit at a position opposite to the slit, and includes a surface plate that sucks and holds the workpiece through the slit, and an air blow nozzle that blows compressed air through the slit to the vicinity of the opening position of the workpiece. A laser hole drilling device characterized by: (2) The laser hole drilling apparatus according to claim (1), wherein the compressed air blown from the air blow nozzle is sucked into the workpiece and exhausted to the outside of the surface plate. (3) The laser hole drilling apparatus according to claim (2), wherein the compressed air from the air blow nozzle is blown in a direction opposite to the traveling direction of the workpiece.