JPS6120679A - Laser drilling device - Google Patents

Abstract

PURPOSE:To provide the titled device reducing the adhesion of the burn residues as well as securing the material to be worked by dividing the attracting slit of detecting stand into the slit at right angles with the travelling direction of the material to be worked and the slit in the travelling direction and by making the irradiating beam at the specified position of the slit in travelling direction. CONSTITUTION:The attracting slit 10 of the detecting stand 9 beneath the travelling material 7 to be worked is divided into the slit 10a which is at right angles with the travelling direction A of the material 7 to be worked and the slit 10b in the travelling direction A and the irradiating position of the irradiating pulse laser beam of a condensing lens holding cylinder 4 is made 1:4-1:5 travelling direction against the length of the slit 10b in the travelling direction. The material 7 to be worked is held securely with the slit 10a in right angled direction and the burn residues at the pulse laser beam irradiating drilling part are sufficiently attracted and removed with the slit 10b in the travelling direction to reduce the residues.

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.

Figure 1 is a plan view of the conventional device, and Figure 2 is a front cross-sectional view. (3) is a condenser lens that focuses the laser beam from the reflecting mirror (2), (4) is a holding cylinder, and (5) is a holding cylinder for introducing processing gas into the holding cylinder (4). Supply processing gas inlet, (6) is nozzle, (7)
is a long strip-shaped workpiece such as paper (hereinafter referred to as the original fabric),
(8) is a tension roller (9
) is the light receiving stand that guides the original fabric (7), and 4 is the light receiving stand (9)
This is a slit provided perpendicularly to the running direction of the original fabric (7), and is provided at a position opposite to the condenser lens (3).

The α force is transmitted through the exhaust port, and from inside the light receiving stand (9) through the slit (
The original fabric (7) is sucked through II.

Next, the operation of the conventional device configured as described above will be explained. First, a pulsed laser beam output from a pulsed laser oscillator (1) is reflected downward by a reflecting mirror (2) and guided to a condenser lens (3).

The laser beam is focused in the condenser lens (3).

The focus is exactly at the opening position of the original fabric (7), that is, near the top of the sulin Ql. On the other hand, raw fabric (7)
is running between the tension rollers (8) and above the light receiving stand (9) in the direction of the arrow. In addition, Surin Ql 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 10~10 mm in the direction perpendicular to the running direction of the original fabric (7). The original fabric (7) is sucked onto the light receiving stand (9) through the slit α0 by suctioning the inside of the light receiving stand (9) through the exhaust port aυ. , ensuring stable running of the web (7) in the opening between the tension rollers (8). Furthermore, in order to protect the condenser lens (3) from the burnt residue of the web (7), the condenser lens ( 3) is provided with a processing gas inlet (5) at the bottom thereof, and dry air is ejected from a nozzle (6) coaxially with the laser beam.

Therefore, apertures can be continuously formed in the original fabric (7) by the pulsed laser beam focused by the condenser lens (3).

By the way, the conventional laser aperture device is configured as described above, and since the original fabric (7) is moved in the direction of the arrows in Figs. 1 and 2, holes are formed in the original fabric (7). A phenomenon occurs in which the burnt residue generated when the material is installed spreads out and adheres to the end of the Surin + 11. This phenomenon is particularly noticeable in the front of the web (7) in the running direction, that is, on the downstream side. be. The adhesion of this burnt residue gradually grows and the slit Ql
It will block the

As a result, the suction operation of the web (7) is not performed properly, and burnt residue also grows on the 5th part of the light receiving table (9) near the slit OI, contaminating the web (7) and There was a drawback that by lifting the hole (7), the focal position of the laser beam was changed and the quality of the hole opening was deteriorated.

The cinders attached to slit 0 are still growing.

This had the disadvantage that it would burst into flames when irradiated with a laser beam. Therefore, in order to eliminate these drawbacks, it is necessary to frequently clean the vicinity of the tlG, resulting in a problem that the work efficiency is significantly reduced.

This invention was made in view of the above-mentioned drawbacks, and reduces the adhesion of burnt residue generated from the original fabric.

It is an object of the present invention to obtain a laser hole punching device which is safe and has good workability, and which can reliably suction and hold an original fabric.

In order to achieve the above object, the present invention has two slits formed in the light receiving table: a first slit extending forward and backward in the running direction of the fabric, and a first slit provided in a direction perpendicular to the running direction of the fabric. a second plurality of slits;
This is characterized in that the entire width of the original fabric is held by suction through the second slit.

An embodiment of the present invention will be described below with reference to the drawings. Third
The figure is a plan view showing one embodiment of the laser hole drilling device according to the present invention, FIG. 4 is a three-dimensional perspective view of FIG. 3, and FIG.
1ob) is the original fabric (a gas slit extending forward and backward in the running direction of the force and parallel to the running direction, and a condensing lens (3)
It is provided on the light receiving stand (9) near the opposing position. Moreover, (10a) is a slit in a direction perpendicular to the running direction of the original fabric (7), and is provided at various locations in the non-laser aperture portion. This is it! ] "i1-(1oa)" is particularly useful for thin raw materials or materials that tend to shrink in the direction perpendicular to the running direction, and allows for stable running without causing wrinkles in the material. 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) was used as the original fabric (7), and the running speed of the original fabric (7) was set to 150.
m/min, and the aperture size by the laser beam is 0.
When holes of 2 x 0.4 m were drilled with a laser at a rate of 10 holes per minute, the conventional equipment shown in Figs. Approximately 1
0m width) was completely blocked by cinders and became unoperable. Furthermore, even if the slit width is increased to about 20 mm, the burnt residue will start to accumulate mainly at the downstream edge.
I was unable to drive for long periods of time.

However, in the embodiment shown in FIGS. 3 and 4, the shape of 2 slits (10b) is oval parallel to the paper running direction, and one dimension is 10+m in width.

The length is approximately 15W1. m, 6 on the downstream side, i.e. in the front in the direction of travel.
5. When holes were opened under the same hole-opening conditions as the conventional device, no sludge remained even after approximately 2 to 3 hours of continuous operation.
Good operating results were obtained in the section (10b) without clogging with burnt debris.

In addition, in the above example, chip paper was used for the raw fabric (7), but even if it is thermally decomposed, there will be no residue (burnt residue).
Workpieces that leave residue 1For example, cloth.

Similar effects can be obtained by performing laser hole drilling in composite materials and the like. Furthermore, the shape and two dimensions of the slits (10a) and (10b) provided in the light receiving stand (9) may be optimized depending on the material of the original fabric t7i, hole opening conditions, etc.

As described above, in the device of this invention, the structure 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 extends forward and backward in the traveling direction of the workpiece. The first slit is composed of a first slit and a second plurality of slits provided in a direction perpendicular to the running direction. The workpiece is spread across the entire width through the second slit.
Since the workpiece is held by suction, the long strip-shaped workpiece can be held securely, and 2. It has the effect of reducing the adhesion of burnt residue and improving workability.

[Brief explanation of drawings]

FIG. 1 is a plan view showing a conventional laser hole drilling device. FIG. 2 is a front cross-sectional view of the conventional laser hole drilling device shown in FIG. 1, FIG. 3 is a plan view showing a laser hole drilling device according to an embodiment of the present invention, and FIG. FIG. 3 is a three-dimensional perspective view of the illustrated laser aperture device. In the drawings, the same reference numerals indicate the same or corresponding parts. (1)...Pulse laser oscillator, (2)...Opening mirror. (3)...Condensing lens, (4)・4・Holding cylinder,
(5)...Curved processing gas inlet, (6)...Curved nozzle, (
7)・River...Long strip-shaped workpiece, (8)...
・Tensimi/Roller, (91 songs...Receiver stand. α ■・4・Slits, (10a)・・4 sets of 2 slits. (10b)・・・・1st slin), (+1)・・
...This is an exhaust port.

Claims (6)

[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, a feeding device that continuously drives a long strip-shaped workpiece, and the above-mentioned condenser. A first slit extending forward and backward in the running direction of the workpiece from a position facing the optical lens, and a second plurality of slits provided in a direction perpendicular to the running direction of the workpiece, A laser hole drilling apparatus comprising a light receiving table that suctions and holds the workpiece over its entire width through the first and second slits. (2) The laser hole drilling device according to claim (1), wherein the first slit has a length of 5:1 to 4:1 in the front and back of the workpiece in the traveling direction. . (3) Place the first slit 6 in front of the workpiece in the running direction.
The laser hole drilling device according to claim (2), characterized in that it has a length of 5 mm and a length of 15 mm at the rear. (4) The second plurality of slits are provided in a distributed manner over the entire surface of the light receiving stand.
3) The laser hole drilling device described in section 3). (5) A laser hole punching apparatus 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.