JP2001062577A - Laser processing equipment - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To enable horizontal perforations to be formed correctly even at different paper feed speeds. SOLUTION: A carbon dioxide laser 10 performs pulse laser oscillation, and an output beam 12 of the carbon dioxide laser 10 is a beam expander 14,
The light enters the polygon mirror 22 rotating at a constant speed via the mirrors 16 and 18 and the lens 20, and is reflected there. The polygon mirror 22 scans the reflected beam within a certain plane by rotating. The beam reflected by the polygon mirror 22 is condensed and corrected by the lens 24 so that it is focused on the continuous paper 26, and then enters the continuous paper 26. Mirror 18, lens 20, polygon mirror 2
2 and the condenser correction lens 24 are fixed to a base 28. The servo motor 3 is provided on the lower surface of one end of the base 28.
0 is installed, and the motor 30 is moved from the mirror 16 to the mirror 1
The base 28 is rotated around the laser beam incident on the base 8. The motor drive circuit 36 drives the motor 30 according to the paper feed speed signal of the continuous paper 26, and automatically adjusts the angle between the base 28 and the paper feed direction of the continuous paper 26 to an angle suitable for forming horizontal perforations.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a laser processing apparatus, and more specifically, to a relatively moving sheet.
The present invention relates to a laser processing apparatus for processing in a lateral direction by a laser beam.

[0002]

2. Description of the Related Art A laser processing apparatus for forming a vertical perforation, a vertical slit, a half slit and the like on a continuous sheet by a laser pulse beam is well known (for example, Japanese Patent Application Laid-Open No. Hei 9-38789).

A laser processing apparatus for forming perforations (width perforations) in the width direction of continuous paper is disclosed in Japanese Patent Application Laid-Open No. 59-780.
No. 67 is described.

[0004]

When forming a perforation (horizontal perforation) in the paper width direction of continuous paper, generally, the paper is intermittently moved and the paper is stopped. It is necessary to scan a laser beam in the width direction of the paper to form desired perforations and slits. However, with this, the processing speed cannot be increased, and the productivity is poor.

On the other hand, in order to form a horizontal perforation while feeding a sheet, as described in the left column of page 3 of JP-A-59-78067, "the beam irradiation angle is controlled by the traveling speed of the sheet. It is necessary to make it match freely. But,
Manually adjusting the positions of the polygon mirror 2 and the condenser lens 3 so that the beam irradiation angle becomes an angle corresponding to the paper feeding speed is not only troublesome, but also, for example, from the start of the paper feeding until the stable speed is reached. Then, a correct horizontal perforation cannot be formed. Similarly, a correct horizontal perforation cannot be formed even from the stable speed until the sheet is stopped.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a laser processing apparatus that enables horizontal processing while continuously moving a sheet.

Another object of the present invention is to provide a laser processing apparatus capable of correctly performing horizontal processing by following a change in the paper feed speed.

[0008]

SUMMARY OF THE INVENTION A laser processing apparatus according to the present invention is a laser processing apparatus for processing continuously moving paper in a direction perpendicular to a feeding direction thereof. A laser beam scanning means for scanning a laser beam output from a laser beam within a certain plane to irradiate a sheet, and changing a scanning surface of the laser beam scanning means to an angle corresponding to a feed speed of the sheet with respect to the sheet. Scanning angle changing means.

By providing the scanning angle changing means,
Regardless of the paper feed speed, the laser beam can be correctly moved in the width direction of the paper, and the paper can be processed along the width direction of the paper. In addition, by changing the angle of the laser beam scanning surface with respect to the sheet according to the sheet feed speed, it is possible to correctly follow the change in the sheet feed speed, thereby improving both productivity and operability.

The scanning angle changing means is, for example, a support member for supporting the laser beam scanning means, and rotationally drives the support material in accordance with a feed speed of the paper, whereby a scanning surface of the laser beam scanning means is scanned. Is adjusted to an angle corresponding to the paper feed speed with respect to the paper. This makes it possible to appropriately change the inclination of the scanning surface of the laser beam with respect to the sheet feeding speed with a simple configuration.

[0011] The laser beam scanning means preferably comprises a polygon mirror.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a perspective view of one embodiment of the present invention. The carbon dioxide laser 10 oscillates pulsed laser, and its output beam 12 is a beam expander 14,
The light enters the polygon mirror 22 rotating at a constant speed via the mirrors 16 and 18 and the lens 20, and is reflected there. As is well known, the polygon mirror 22 can scan the reflected beam within a certain plane by rotating. The beam reflected by the polygon mirror 22 is condensed and corrected by the lens 24 so that it is focused on the continuous paper 26, and then enters the continuous paper 26.

The continuous paper 26 is continuously transported in a direction indicated by reference numeral 26A, which is a direction substantially orthogonal to the beam scanning direction by the polygon mirror 22. The angle between the beam scanning direction by the polygon mirror 22 and the feeding direction of the paper 26 is
It is automatically adjusted according to the feed speed of the paper 26. The details will be described later.

In this embodiment, the mirror 18, the lens 20,
The polygon mirror 22 and the condensing correction lens 24 are fixed to a base 28. For easy understanding, a member for fixing the condenser correction lens 24 to the base 28 is not shown.

A servo motor 30 is provided on the lower surface of one end of the base 28. The servo motor 30 allows the base 28 to rotate about the laser beam incident on the mirror 18 from the mirror 16. At the other end of the base 28,
The polygon mirror 22 is rotatably supported by support columns 32. A motor for rotating the polygon mirror 22 is incorporated in the support column 32.

A slit 34 is formed at the center of the other end of the base 28 so that the laser beam reflected by the polygon mirror 22 can be incident on the condenser correction lens 24.

The motor drive circuit 36 drives the servomotor 30 in accordance with the sheet feed speed signal of the continuous sheet 26,
The angle between the base 28 and the paper feed direction of the continuous paper 26 is
Automatically adjusts to an angle suitable for horizontal perforation formation.

FIG. 2 shows the relationship between the paper feed speed and the scanning direction of the processing beam. Assuming that the paper feed speed is v (m / s), the processing width of the horizontal perforation is L (m), and the scanning time of the laser beam for processing one horizontal perforation is T (s), the processing laser By the time one horizontal perforation process is started and finished, the sheet 26 advances by v · T. Therefore, the processing beam needs to scan the paper 26 at an angle θ given by θ = arctan (vT / L). Since T and L are known, the drive circuit 36 calculates the angle θ from the input paper feed speed signal v, and drives the servomotor 30 so that the angle θ is obtained, thereby rotating the base 28. Instead of T and L, the scanning speed of the processing beam, that is, the rotation speed of the polygon mirror 22 may be used.

As described above, by changing the angle of the scanning surface of the polygon mirror 22 with respect to the sheet 26 in accordance with the speed at which the sheet 26 is fed, the laser beam irradiated on the sheet 26 is moved in the feeding direction of the sheet 26. Perforations and the like can be formed in the sheet 26 in a direction perpendicular to the right direction.

In this embodiment, the scanning angle θ of the processing laser with respect to the paper 26 is automatically adjusted according to the feed speed of the paper 26.
Is automatically adjusted, so that a correct horizontal perforation can be formed while continuously feeding the sheet 26 and even if the feed speed of the sheet 26 changes. Therefore, a correct horizontal perforation can be formed even from the start of feeding of the sheet 26 to the time when the paper 26 reaches the stable speed and the time from the stable speed to the stop.

In the above embodiment, the laser 10 is fixed, but the laser 10 may be fixed on the base 28. However, since this type of carbon dioxide laser is heavy and needs to supply large power, it is better not to move it. In practical use, as shown in FIG.
Preferably, a laser beam is directed above.

[0023]

As can be easily understood from the above description, according to the present invention, a sheet can be processed along the sheet width direction regardless of the sheet feed speed. Moreover,
Even if the paper feed speed fluctuates, it can follow up correctly, and both productivity and operability are improved.

[Brief description of the drawings]

FIG. 1 is a perspective view of one embodiment of the present invention.

FIG. 2 is an explanatory diagram of a laser scanning angle θ.

[Explanation of symbols]

 10: Carbon dioxide laser 12: Output laser beam 14: Beam expander 16, 18: Mirror 20: Lens 22: Polygon mirror 24: Condensing correction lens 26: Continuous paper 26A: Feeding direction of paper 26 28: Base 30: Servo motor 32: support column 34: slit 36: drive circuit

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B65H 35/04 B65H 35/04 G02B 26/10 102 G02B 26/10 102

Claims (3)

[Claims] 1. A laser processing apparatus for processing continuously moving paper in a direction orthogonal to a feed direction thereof, wherein the laser processing apparatus scans a laser light source and a laser beam output from the laser light source in a predetermined plane. A laser beam scanning unit for irradiating the sheet, and a scanning angle changing unit for changing a scanning surface of the laser beam scanning unit to an angle corresponding to a feed speed of the sheet with respect to the sheet. Laser processing equipment. 2. A scanning angle changing unit, comprising: a support member for supporting the laser beam scanning unit; and a rotation member for driving the support member in accordance with a feed speed of the sheet.
2. The laser processing apparatus according to claim 1, further comprising a driving unit configured to adjust a scanning surface of the laser beam scanning unit to an angle corresponding to a feeding speed of the sheet with respect to the sheet. 3. The laser processing apparatus according to claim 1, wherein said laser beam scanning means is a polygon mirror.