JPH0216196B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a laser aperture device for continuously forming apertures at predetermined intervals in a long strip-shaped workpiece (hereinafter referred to as an original fabric) using a pulsed laser beam. In particular, the present invention relates to a laser hole punching device with an improved structure of a surface plate that holds an original fabric.

A conventional device of this type is shown in FIG. In the figure, reference numeral 1 denotes a plurality of laser processing heads that converge a pulsed laser beam and are installed in a direction perpendicular to the running direction A of the original fabric 2 at intervals that do not interfere with each other, and are movable according to the processing position and focal position. It is arranged. 3 is the original fabric 2 at the bottom of the original fabric 2.
This is a surface plate provided to hold the In addition,
As the pulse laser, an efficient CO ₂ laser (output wavelength 10.6 μm) is mainly used. Also, 3a
is a slit provided in a surface plate 3 at a position opposite to the laser processing head 1, and the original fabric 2 is held by suction through this slit 3a. The position of opening holes in the original fabric 2 by the laser is set by moving the original fabric 2 or the laser processing head 1 in a direction perpendicular to the running direction A of the original fabric 2. Therefore, the surface plate 3 is provided with slits 3a so that the laser beam and the residue (burnt residue) caused by the laser aperture can penetrate all the laser irradiation positions that change as the laser processing head 1 moves. It is being This slit 3a is normally provided in a direction perpendicular to the traveling direction A of the web 2, and the lower part of the surface plate 3 is made to have a negative pressure, and the web 2 is sucked onto the surface plate 3 through this slit 3a. 2 to ensure stable running.
In addition, this slit 3a is useful when the web 2 is thin or when the web 2 is made of a material that easily shrinks in the direction perpendicular to the running direction A of the web 2 because it allows the material to run stably without wrinkles or the like. It is.

In the conventional apparatus configured in this way, a pulsed laser is irradiated from the laser processing head 1 while the original fabric 2 is traveling in the direction of arrow A by a feeding device (not shown) to continuously open holes at predetermined intervals. was forming.

Incidentally, the surface plate 3 of the conventional laser hole drilling device is constructed as described above, and the burnt residue caused by the laser drilling adheres to and grows on both edges of the slit 3a, so that the burnt residue blocks the slit 3a. As a result, the laser beam hit the cinders that blocked the slit 3a, creating a risk of fire. In addition, the burnt residue also grows in the upper part of the slit 3a and enters between the surface plate 3 and the web 2, contaminating the product and
There was a drawback that the quality of opening holes in the original fabric 2 was affected because the laser focus position was changed by lifting the laser beam. Even if various improvements are made to the surface plate 3 to solve these problems, if there is a change in the material of the web 2, the width of the web 2, the perforation position, the perforation conditions, etc., the new It is necessary to design and manufacture the surface plate 3 to correspond to the conditions and replace it, especially for the raw material 2.
This work is not easy when the number of rows of holes is large and the width of the original fabric 2 is wide.

This invention was made in order to eliminate the drawbacks of the above-mentioned conventional products, and consists of a plurality of crosspieces arranged in a direction perpendicular to the running direction of the raw material on the surface plate, and a special plate part that is detachable from the crosspieces. It is an object of the present invention to provide a laser drilling device which has a two-stage structure, allows easy cleaning of burnt residue generated during laser drilling work, and allows the surface plate to be easily and inexpensively changed in response to changes in drilling conditions. purpose.

An embodiment of the present invention will be described below with reference to FIG. In the figure, a plurality of crosspieces 4 are provided in a direction perpendicular to the running direction A of the web 2, and serve as members of strength of the entire surface plate and are fixed semi-permanently.
5 is the shape most suitable for the opening conditions on the crosspiece 4;
It is a light receiving plate that is structured, lightweight, and can be easily attached to and detached from the crosspiece 4. Further, 5a is located at a position opposite to the laser processing head 1 in the running direction A of the original fabric 2.
The slit 5b extending toward the slit 5b is a slit provided in a direction perpendicular to the slit 5a.
The original fabric 2 is held by suction by a and 5b. Therefore, the surface plate 6 is composed of the crosspiece 4 and the light receiving plate 5.

Here, cigarette filter wrapping paper (chip paper) with a width of about 500 mm is used as the raw material 2, and it is run at a traveling speed of 150 m/min. A CO ₂ pulse laser is used as the laser, and 40 laser processing heads are applied to the raw material 2. Arranged at a pitch of approximately 40 mm in the running direction, the
When 3.5× ¹⁰⁶ holes were formed and a hole drilling experiment was conducted using a surface plate 6 like the example shown in Fig. 2, it was found that when changing hole conditions such as changing the hole position, Since the light-receiving plate 5 is easily attachable and detachable, the surface plate 6 can be modified or repaired with little time and cost, the light-receiving plate 5 can be cleaned easily, and various modifications can be made to the light-receiving plate 5, which is a good result. was gotten.

In the above embodiment, chip paper is used as the material for the original fabric 2, but it is also possible to use a workpiece that leaves residue (burnt residue) even after thermal decomposition, such as cloth, composite material, etc. Further, as the laser, a gas laser other than the CO ₂ laser, a YAG laser, or the like may be used.

As described above, according to the present invention, in a laser hole drilling apparatus for continuously forming holes at predetermined intervals in a long strip-shaped workpiece, the surface plate supporting the workpiece is replaced with the light receiving plate. In particular, the part of the light receiving plate in contact with the workpiece is removable from the crosspiece, making it easy to modify the surface plate under hole-opening conditions and prevent burnt scum. This has the excellent effect of being a simple and inexpensive countermeasure.

[Brief explanation of drawings]

Figure 1 is a three-dimensional diagram showing a conventional laser hole drilling device.
FIG. 2 is a three-dimensional view showing a laser aperture device according to an embodiment of the present invention. In the figure, 1... laser processing head, 2... workpiece, 3, 6... surface plate, 4... beam, 5... light receiving plate, 3a, 5a, 5b... slit. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. Run a long belt-shaped workpiece while holding it on a surface plate, and move the workpiece to the opposite side of the surface plate through the workpiece at a predetermined distance from each other in a direction perpendicular to the running direction of the workpiece. In the laser hole drilling device, a plurality of laser processing heads are disposed in the laser processing head, and a hole is formed in the workpiece by a focused pulsed laser beam from the laser processing head, and the surface plate is aligned in the traveling direction of the workpiece. A plurality of crosspieces arranged in a direction perpendicular to the
A laser hole drilling device comprising: a light receiving plate that holds the workpiece, has a slit at a position facing the plurality of laser processing heads, and is detachable from the beam.