JPH06170574A - Laser beam machine - Google Patents

Abstract

PURPOSE:To improve the reliability and safety for positioning a working head by providing stoppers mutually abutting with each other in the moving direction on a fixed part and a movable part respectively and moving one of the stoppers to shift the abutting position. CONSTITUTION:A cylinder 20 is driven to slide a second gib 19, a first gib 18 (movable stopper) is contacted with the second gib 19 to be slid in a direction orthogonally crossing the sliding direction of the second gib 19 and the surface 16a is positioned. A movable part 15 is lowered and approaching of a stopper 16 is detected by a sensor 21 to reduce the moving speed of the movable part 15 and the abutting surface 16a is abutting with 18a. Making the position as the irradiating position of the working head 12 and the machining is begun. The positioning of the working head 12 is also made by operating the first and second gibs after contacting the stoppers.

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 particularly to positioning of a processing head.

[0002]

2. Description of the Related Art FIG. 4 is a schematic view showing a structure of a conventional laser processing apparatus in which a machining head is moved by a chain drive. In the figure, 1 is a processing head mounted on a table 2, 3 is a guide part of the table 2, 4 is a chain engaged with the guide part 3, 5 is a sprocket for guiding the chain 4, and 6 is provided on the chain 4. The counter weight, 7 is a drive sprocket that transmits the power from the servo motor 8 to the chain 4, 9 is a PLG that is directly connected to the servo motor 8 to measure the rotation angle, and 10 is a command value from the command unit 11 from the PLG 9. It is a servo amplifier that controls the servo motor 8 by comparing it with data.

Next, the operation will be described. The command value from the command unit 11 is input to the servo amplifier 10 to control the servo motor 8. The drive sprocket 7 rotated by the servo motor 8 rotates the chain 4 so that the table 2 moves along the guide portion 3. A counter weight 6 is inserted in the direction in which the table 2 and the machining head 1 are balanced with each other to reduce the load on the servo motor 8 and prevent the machining head 1 from sliding down. Servo motor 8 is used for positioning and holding.
This is done by operating the disc brake directly connected to.

[0004]

Since the conventional apparatus is constructed as described above, the machining head slides down due to the slow reaction of the brake due to a sudden power failure while the machining head is positioned, and noise is generated. There has been a problem that the precision equipment attached to the tip of the processing head is damaged or out of order due to malfunction due to external disturbances or sensor failure.

The present invention has been made to solve the above problems, and an object of the present invention is to obtain a laser processing apparatus with improved reliability and safety in positioning a processing head.

[0006]

The positioning of the machining head in the laser machining apparatus according to the present invention is provided with a stopper that abuts against the fixed portion and the operating portion in the moving direction, and one of the stoppers is displaced in the abutting position. It is configured to be movable.

[0007]

In the laser processing apparatus according to the present invention, the movable stopper adjusts the irradiation position of the processing head, and the abutment of both stoppers prevents the processing head from slipping off.

[0008]

【Example】

Example 1. Embodiment 1 of the present invention will be described below with reference to the drawings. 1 is a perspective view showing the configuration of a laser processing apparatus according to a first embodiment of the present invention. In the figure, 12 is a machining head mounted on the laser unit 13, 14 is a motor for moving the laser unit 13, and these 12 to 13 form an operating part 15. Reference numeral 16 is a stopper attached to the moving part 15 and having a contact surface 16a. Reference numeral 17 denotes a fixed portion having a guide 17a and a guide 17b of the operating unit 15,
Reference numeral 18 denotes a first gib of a stopper having a contact surface 18a and having a tapered back surface 18b and slidable along a guide 17b. Reference numeral 19 denotes a tapered surface 19a that abuts the tapered back surface 18b of the first gib. The second gib that slides in the direction in which the tapered surface 19a slides by the driving force of the cylinder 20 constitutes a stopper that can be moved by these 19 to 20.
21 is adjacent to the contact surface 18a of the first gib and is a stopper 16
It is a sensor that senses the proximity of.

Next, the operation will be described. First, the cylinder 20 is driven to slide the second gib 19, and the first gib 18 is slid in contact with the first gib 18 in the direction perpendicular to the sliding direction of the second gib 19 to move the position of the contact surface 16a. decide. Next, the operating part 15 is lowered, but the sensor 21 detects that the stoppers are approaching each other, and the moving speed of the operating part 15 is reduced to bring the contact surfaces 16a and 18a into contact with each other. This position is the irradiation operation position of the processing head, and the laser processing is started.

It is also possible to first bring the stoppers into contact with each other and then operate the first and second gibs 18 and 19 to position the machining head.

Embodiment 2. Further, in the first embodiment, the structure in which the displaceable stopper is provided on the fixed portion side is shown, but this may be provided in the operating portion.

Embodiment 3. Further, in the first embodiment, the movement of the contact surface of the stopper for positioning the machining head is made to act by the combination of the taper gib, but as shown in FIG. 2, an eccentric cam 21 having an eccentric outer circumference as the contact surface 21a is used. Alternatively, the drive motor 22, the eccentric cam 21, and the gear 23 interposed between the drive motor 22 may be used to displace the contact surface with the stopper 16 depending on the stop position of the eccentric cam 21. In this case, for decelerating the moving part immediately before the machining head 12 is positioned, as shown in the figure, for example, a shock absorber 24 utilizing expansion and contraction of the spring 24a is provided, and the shock absorber is shocked immediately before the stopper 16 and the eccentric cam 21 come into contact with each other. The device 24 is adapted to come into contact with the moving part 15.

Embodiment 4. In the first and third embodiments, the machining head can be positioned steplessly, but if the machining head can be limited to several steps, the stopper portion is contacted as shown in FIG. A plurality of setting holes 25a are provided in advance on the side of the positioning stopper 25 having the surface 25b, and the stopper 26 is positioned and fixed by selectively inserting the pin 26 with the spring 27 set on the opposite surface. 28 is a moving means for displacing the stopper 25.

[0014]

As described above, according to the present invention, the positioning of the machining head is provided with the stoppers which come into contact with the fixed portion and the moving portion in the moving direction, and one of the stoppers is moved so that the abutting position is displaced. Since the configuration is made possible, there is an effect that the positioning of the processing head and the prevention of the slipping off are performed at the same time, and the laser processing apparatus which effectively enhances the reliability and safety is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing a configuration of a laser processing apparatus according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a configuration of a laser processing apparatus according to a third embodiment of the present invention.

FIG. 3 is a partial cross-sectional view showing a configuration of a laser processing apparatus according to a fourth embodiment of the present invention.

FIG. 4 is a schematic diagram showing a configuration of a conventional laser processing apparatus.

[Explanation of symbols]

 12 machining head 15 moving part 16 stopper 16a contact surface 17 fixed part 18 first gib (movable stopper) 18a contact surface (contact position) 19 second gib 21 eccentric cam 21a contact surface (outer peripheral surface)

Claims (3)

[Claims] 1. A laser processing apparatus for performing laser processing by moving a moving part having a processing head for irradiating a laser at a tip thereof along a guide of a fixed part in the laser orbit direction to position the processing head and perform laser processing. The fixed portion and the operating portion are provided with stoppers that come into contact with each other in the moving direction, and one of the stoppers is used as a movable stopper that displaces the contact position to position the machining head. Characteristic laser processing equipment. 2. The movable stopper has a first abutment which has an abutment surface and has a tapered rear surface and is slidably guided in the laser orbit direction, and a tapered surface slidably contacting the rear surface. 2. The laser processing according to claim 1, further comprising a second gib that freely slides in a direction perpendicular to the laser orbital direction, and the abutment surface is displaced by sliding the second gib. apparatus. 3. The movable stopper is composed of an eccentric cam which is freely rotatable with an eccentric outer periphery as an abutting surface, and the abutting surface is displaced by a stop position of the eccentric cam. The laser processing apparatus according to claim 1.