JPH0234277B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser hole drilling device for continuously forming holes at predetermined intervals in a long strip-shaped workpiece using a pulsed laser beam.

Conventionally, there have been devices of this type as shown in FIGS. 1 and 2.

Fig. 1 is a plan view of a conventional device, and Fig. 2 is a front cross-sectional view. A reflecting mirror, 3 a condensing lens for focusing the laser beam from the reflecting mirror 2, 4 a holding cylinder, 5 a processing gas inlet for supplying processing gas into the holding cylinder 4, 6 a nozzle, 7 a paper etc. A long strip-shaped workpiece (hereinafter referred to as the original fabric); 8 is a tension roller rotated by a feeding device (not shown) that continuously drives the original fabric 7; 9 is a light receiving device that guides the original fabric 7; stand, 1
0 is a slit provided in the light receiving table 9 at a right angle to the running direction of the original fabric 7, and is provided at a position where the condensing lens 3 condenses and irradiates the laser beam onto the original fabric 7. 1
1 is an exhaust port, which connects the slit 1 from inside the light receiving table 9.
The original fabric 7 is sucked through the

Next, the operation of the conventional device configured as described above will be explained. First, a pulsed laser beam outputted from a pulsed laser oscillator 1 passes through a reflecting mirror 2.
The light is reflected downward and guided to the condenser lens 3. The laser beam is focused by the condenser lens 3, and is focused exactly at the opening position of the original fabric 7, that is, near the top of the slit 10. on the other hand,
The original fabric 7 is running between tension rollers 8 on a light receiving table 9 in the direction of arrow A. The slit 10 is provided so that the focused laser beam and the burnt residue of the original fabric 7 after opening can easily pass through, and has a width of about 10 to 20 mm in a direction perpendicular to the running direction of the original fabric 7. It is provided. In addition, by suctioning the inside of the light receiving table 9 through the exhaust port 11, the slit 1
The original fabric 7 is attracted to the light-receiving table 9 through the tension roller 8 to ensure stable running in the opening of the original fabric 7 between the tension rollers 8. Further, in the upper part of the opening of the web 7, a processing gas inlet 5 is provided at the lower part of the condenser lens 3 in the holding tube 4 in order to protect the condenser lens 3 from the burnt residue of the web 7. is provided so that dry air is ejected from the nozzle 6 coaxially with the laser beam. Therefore, the pulsed laser beam focused by the condensing lens 3
This means that openings can be formed continuously.

By the way, the conventional laser hole-opening device is configured as described above, and since the original fabric 7 is moved in the direction of the arrow in FIGS. 1 and 2, when holes are made in the original fabric 7, The resulting cinders are scattered and the slit 1
The phenomenon of adhesion to the edge of 0 occurs. This phenomenon is particularly noticeable at the rear of the web 7 in the running direction, that is, on the downstream side. The adhesion of this burnt residue gradually grows and blocks the slit 10. For this reason, the suction operation of the web 7 cannot be performed properly, and burnt residue also grows on the upper part of the light receiving table 9 near the slit 10, staining the web 7, and lifting the web 7 causes the laser beam to become focused. The disadvantage was that the position changed and the hole quality deteriorated. Further, there was a drawback that the cinders adhering to the slit 10 grew and started to burn when irradiated with the laser beam. Therefore, in order to eliminate these defects, it is necessary to frequently clean the vicinity of the slit 10, resulting in a problem that workability is significantly reduced.

This invention was made in view of the above-mentioned drawbacks, and it is an object of the present invention to reduce the adhesion of burnt residue generated from the original fabric, to obtain a laser perforation device that is safe and has good workability, and to securely suction and hold the original fabric. The purpose of the present invention is to obtain a laser hole drilling device that can perform the following steps.

In order to achieve the above object, the present invention has two slits formed in a light receiving table, a first slit extending forward and backward in the running direction of the original fabric, and a first slit provided in a direction perpendicular to the running direction of the original fabric. A second plurality of slits are formed, and the original fabric is sucked and held over its entire width through the first and second slits.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is a plan view showing an embodiment of the laser hole punching device according to the present invention, and FIG. 4 is a three-dimensional perspective view of FIG. Moreover, it is a slit parallel to the running direction, and is provided on the light receiving table 9 near the position where the laser beam is focused and irradiated onto the original fabric 7 by the focusing lens 3 . Furthermore, slits 10a extend perpendicularly to the running direction of the web 7, and are provided at various locations in the non-laser apertures. This slit 10a is particularly useful for thin raw materials or materials that tend to shrink in the direction perpendicular to the running direction, and is provided so that the material can run stably without wrinkles or the like. . In FIGS. 3 and 4, the same reference numerals as in the conventional apparatus shown in FIGS. 1 and 2 indicate the same or corresponding parts.

Here, cigarette filter wrapping paper (chip paper) is used as the raw material 7, and the running speed of the raw material 7 is determined.
When the laser beam was used to drill 10 ⁵ holes per minute at a speed of 150 m/min and the opening size was 0.2 x 0.4 mm, it took about 15 minutes using the conventional equipment shown in Figures 1 and 2. After 10 hours of operation, 10 slits (approximately 10 mm wide) were completely clogged with cinders and became unoperable. Furthermore, even if the slit width was increased to about 20 mm, burnt residue still started to accumulate mainly on the downstream edge, making it impossible to operate for a long time.

However, in the embodiment apparatus shown in FIGS. 3 and 4, the shape of the slit 10b is oval parallel to the paper running direction, and the dimensions are 10 mm in width and 10 mm in width.
The length is approximately 15 mm on the upstream side of the laser irradiation position, that is, in front of the running direction of the original fabric, and 65 mm on the downstream side, that is, behind the running direction, and under the same hole-opening conditions as the conventional device.
When the hole was opened, the slit 10b was not clogged with burnt residue even after about 2 to 3 hours of continuous operation, and good operation results were obtained.

In the above embodiment, chip paper was used as the raw material 7, but it is also possible to use a workpiece that leaves residue (burnt residue) even after thermal decomposition, such as cloth, etc.
Similar effects can be obtained by performing laser hole drilling in composite materials and the like. Further, the shape and dimensions of the slits 10a and 10b provided in the light receiving table 9 may be varied and optimized depending on the material of the original fabric 7, hole opening conditions, etc.

As described above, in the device of the present invention, the configuration of the light receiving stand that holds the workpiece in the laser hole drilling apparatus is improved, and the slit formed in the light receiving stand is arranged so that the slit extends forward and backward in the traveling direction of the workpiece. It is composed of a first slit and a plurality of second slits provided in a direction perpendicular to the running direction, and the workpiece is sucked and held across its entire width through the first and second slits. Therefore, it is possible to reliably hold a long strip-shaped workpiece, and at the same time, it is possible to reduce the adhesion of burnt residue and improve workability.

[Brief explanation of drawings]

Fig. 1 is a plan view showing a conventional laser hole drilling device;
FIG. 2 is a front sectional view of the conventional laser hole drilling device shown in FIG. 1, FIG. 3 is a plan view showing the laser hole drilling device according to an embodiment of the present invention, and FIG. FIG. 2 is a three-dimensional perspective view of a laser drilling device. In the figure,
The same reference numerals indicate the same or equivalent parts. 1...Pulse laser oscillator, 2...Reflector, 3
... Condensing lens, 4 ... Holding cylinder, 5 ... Processing gas inlet, 6 ... Nozzle, 7 ... Long strip-shaped workpiece, 8 ... Tension roller, 9 ... Light receiving stand,
10...Slit, 10a...Second slit,
10b...first slit, 11...exhaust port, A
...This is the traveling direction of the workpiece.

Claims (1)

[Claims] 1. A pulsed laser oscillator that outputs a pulsed laser beam, a condensing lens that focuses the laser beam output from the pulsed laser oscillator, and a feed that continuously drives a long strip-shaped workpiece. The device includes a first slit extending forward and backward in the running direction of the workpiece from a position of condensing the laser beam on the workpiece of the condenser lens, and a first slit extending in a direction perpendicular to the running direction of the workpiece. a second plurality of slits provided therein, and a light receiving table that suctions and holds the workpiece over its entire width through the first and second slits. Device. 2. The laser according to claim 1, wherein the first slit has a length of 1:5 to 1:4 in the forward and backward directions of the laser beam condensed irradiation position of the workpiece. hole drilling device. 3 Place the first slit 15mm in front of the laser beam focused irradiation position of the workpiece and 65mm behind it in the traveling direction.
A laser hole drilling device according to claim 2, characterized in that the length is set to . 4. The laser aperture device according to claim 3, wherein the second plurality of slits are distributed over the entire surface of the light receiving table. 5. The laser hole drilling device according to claim 4, wherein the long strip-shaped workpiece is paper. 6. The laser hole drilling device according to claim 4, wherein the long strip-shaped workpiece is cloth.