# US 5,011,282 A · Laser beam path alignment apparatus for laser processing machines

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- Number: US 5,011,282 A
- Document ID: US5011282A
- Status: Granted
- Kind: A
- Application number: 07/438,842
- Filed: 1989-11-16
- Granted: 1991-04-30
- Earliest claimed: 1989-11-16
- Assignees: Amada Company, Limited
- Inventors: Stanley L. Ream; C. S. Lee; G. C. Lim; Kenneth Fukae
- Web page: https://patentgrep.com/patent/US5011282A

## CPC

- G05B 19/4015: {going to a reference at the beginning of machine cycle, e.g. for calibration}
- B23K 26/042: Automatically aligning the laser beam
- B23K 26/043: {along the beam path, i.e. alignment of laser beam axis relative to laser beam apparatus}
- G01B 11/26: for measuring angles or tapers; for testing the alignment of axes
- G05B 2219/41091: Alignment, zeroing, nulling, set parallel to axis
- G05B 2219/45165: Laser machining
- G05B: CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS (systems for controlling or regulating non-electric variables G05D; systems for regulating electric or magnetic variables G05F; control devices or systems insofar as characterised by mechanical features only G05G)
- B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- G01B: MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS

## Abstract

To automatically align a laser beam path with respect to an axis along which a movable carriage of a laser processing machine moves, the apparatus of this invention comprises means for detecting laser beam position at least when the carriage is positioned at a first and a second position, means for displaying the detected laser beam positions, and means for adjusting the mirror tilt angle. In the apparatus, the laser beam path is aligned with respect to the axis by actuating the mirror tilt angle adjusting means so that the second laser beam position on the display means is moved to coinside with the first laser beam position. The apparatus of this invention may comprise, instead of the display means, means for calculating an inclination angle of the laser beam with respect to the axis, based on the distance between the first and the second position, and distance between the first and the second laser beam position.

## Claims

### Claim 1

A laser beam path alignment apparatus for a laser processing machine that is provided with a laser generator, a laser processing head for performing laser processing, a means for moving the laser processing head in a predetermined axis direction, and a mirror for guiding a laser beam from the laser generator to the laser processing head, comprising:
means for detecting a laser beam position through which the laser beam passes, the laser beam position being defined in a plane perpendicular to the predetermined axis direction;
means for storing a first laser beam position which is detected by the laser beam position detecting means in the case where the moving means is positioned at a first position in the predetermined axis direction;
means for displaying the first laser beam position and a second beam position, the second laser beam position being detected by the laser beam position detecting means in the case where the moving means is positioned at a second position in the predetermined axis direction; and
means for rotating the mirror about an axis lying in the surface of the mirror, whereby the second laser beam position is changed to coincide with the first laser beam position.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the moving means is either one of X-axis carriage, Y-axis carriage or Z-axis column.

### Claim 3 (depends on 1)

The apparatus of claim 1, wherein the display means is a monitor CRT for graphically displaying the first and the second laser beam position.

### Claim 4 (depends on 1)

The apparatus of claim 1, wherein the display means is a display device for digitally displaying the first and the second laser beam position.

### Claim 5

A laser beam path alignment apparatus for a laser processing machine that is provided with a laser generator, a laser processing head for performing laser processing, means for moving the laser processing head in a predetermined axis direction, and a mirror for guiding a laser beam from the laser generator to the laser processing head, comprising:
means for detecting a laser beam position through which the laser beam passes, the laser beam position being defined in a plane perpendicular to the predetermined axis direction;
means for storing a first laser beam position and a second laser beam position, the first laser beam position being detected by the laser beam position detecting means in the case where the moving means is positioned at a first position in the predetermined axis direction and the second laser beam position being detected by the laser beam position detecting means in the case where the moving means is positioned at a second position in the predetermined axis direction;
means for calculating the distance between the first position and the second position of the moving means; and
means for calculating an inclination angle of the laser beam with respect to the predetermined axis direction, based on the distance between the first and the second position of the moving means and the first and the second laser beam position.

### Claim 6 (depends on 5)

The apparatus of claim 5, further comprising means for rotating the mirror about an axis lying in the surface of the mirror, in accordance with the inclination angle of the laser beam with respect to the predetermined axis direction, to align the laser beam path.