JPH03230887A - Laser processing machine table device - Google Patents

Abstract

PURPOSE:To prevent the damage of a work supporting part and the stain of a work by automatically retreating the work supporting part before and behind the laser beam emitting position when a laser beam approaches the work supporting part. CONSTITUTION:When a pinion 22 is moved on a fixed rack, the pinion 22 makes a half turn at a stroke where a work supporting device 4 ascends and descends. When this work mounting device approaches a machining head, the work supporting device 4 turns the moment it descends and is made in a state where it is reversed by 180 deg. at the lower limit of descent of the work supporting device 4. Namely, a free bearing 3 in contact with the work is reversed in accordance with the retreat of the work supporting device 4. Accordingly, the damage of the work supporting device 4 by the laser beam is prevented and the stain of the free bearing 3 on the work supporting device 4 by spatters can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a workpiece support device for a processing table of a laser processing machine, and a support device for loading and unloading the workpiece and positioning the workpiece to a reference position for processing on the table. Regarding.

[Prior art]

The table of a conventional cutting laser processing machine has a workpiece lift mechanism equipped with a free bearing for loading and unloading the workpiece and positioning the workpiece on the table, and a needle-shaped or plate-like workpiece for supporting the workpiece during laser processing. A support device is provided.

(Problems to be Solved by the Invention) During laser processing, when the laser beam passes directly above the workpiece support device, the workpiece support device is also cut by the laser beam.

Furthermore, if the workpiece support part is cut, the workpiece in that part will also be damaged.

In addition, when positioning the workpiece to the reference position for processing on the table, it is necessary to slide the workpiece on the table, but if the workpiece support device is needle-shaped or plate-shaped, it is difficult to position the workpiece while sliding it. Met. Therefore,
A work lift mechanism is required in which a free bearing is disposed at a portion of the mechanism that temporarily removes the work from the work supporting device and the part of the mechanism where the work comes into contact.

In addition, since the work slit mechanism in which the free bearing is disposed is placed between the work supporting devices, it is difficult to maintain close spacing in order to remove chips, making it difficult to slide the work.

[Means and operations for solving the problems] In order to solve the above-mentioned problems, the present invention provides means for retracting the workpiece support device when the laser beam passes directly above the workpiece support device, and By arranging free bearings on the support device, it is possible to slide the workpiece on the workpiece support device when loading and unloading the workpiece and positioning the workpiece to the reference position for processing on the table without a workpiece lift mechanism. When the support device is in the retracted position by the retracting means described above, the free bearing on the workpiece support device is retracted to a position where it will not be contaminated by spatter, etc., or the workpiece has a means to protect the free bearing from spatter with a cover, etc. The purpose is to provide a mounting device.

[First example] Embodiments of the invention will be described in detail with reference to the drawings.

FIG. 1 is a top view of the table section of a laser processing machine, in which either table 1 or column 15 moves in the direction of arrow X, and the processing head 11 moves in the direction of arrow Y. 1 has a large number of workpiece mounting devices arranged therein. When processing is performed using this laser processing machine, the workpiece 2 is supported on the table 1 by the workpiece mounting device, and the clamping device 3 is fixed to one end of the table 1.
1 fixes the work 2 on the table 1.

The workpiece mounting device will be described in detail with reference to FIG. 2 and subsequent drawings.

A workpiece support device 40 is provided with a large number of free bearings 3 at the part that contacts the workpiece 2. A shaft 5 is fixed to both ends of the workpiece support device 40, and the shaft 6 is inserted into a guide hole provided in the table.
Allows for free sliding. Further, a collar 7 is fixed to the shaft 5 at a position where the spring force of a spring 6 becomes a predetermined value, and the spring force of the spring 6 supports both ends of the workpiece support device 4 via the collar 7 and the shaft 5. . The total spring force of the springs 6 at this time is set to be a spring force that is equal to or greater than the maximum loaded workpiece weight.

Also, with the cam 9 parallel to the arrow X direction, the table 1
The cams 9 are positioned on both sides of the movement axis of the processing head 11 in the direction of arrow Y, and the cams 9 are fixed so as to be integrated with the movement of the column 15. A roller 8 is rotatably supported at one end of the shaft 5, and the roller 8 is arranged so as to synchronize with the cam 9. When the table l and the cam 9 move relative to each other in the direction of the arrow X, the cam 9 Rollers 8 move on top of the workpiece support device 4, which moves the workpiece support device 4 located in front and behind the processing head 11 downward, and retracts it to a position where it will not be damaged by cutting or the like by the laser beam emitted from the processing head 11. .

Further, when the roller 8 passes from the cam 9, the spring force of the spring 6 returns it to the direction in which it supports the workpiece.

On the other hand, FIGS. 4 and 5 show a protection device that prevents spatter caused by laser cutting from adhering to the free bearing 3 when the workpiece support device 4 is retracted downward.

The protective cover 16 is supported by a link plate 19 rotatably around a shaft 20 fixed to both ends of the workpiece support device 4.
One end of the pin 17 is inserted into the link plate 19, and the other end is inserted into the groove 21 of the cam plate 18. Since the cam plate 18 is fixed to the table 1, the pin 17 inserted into the link plate 19 moves according to the groove 21 of the cam plate 18 when the work supporting device 4 mentioned above moves downward, and the link plate 19 moves downward. It rotates around an axis 20. When the workpiece support device 4 reaches its lower limit, a cover 16 fixed to the link plate 19 covers the free bearing 3 on the workpiece support device 4 to prevent the free bearing 3 from being contaminated by spatter during laser processing. .

Furthermore, as shown in FIGS. 6 and 7, a mechanism is provided for raising and lowering the cam 9 using a lifting device 21 such as an air cylinder, and when moving the table or column other than when cutting, the cam 9 is raised to lift the workpiece. Preventing the support device 4 from falling is effective in extending the life of the spring 6.

[Second Embodiment] This embodiment is an example of a workpiece mounting device in which, when the workpiece support device is retracted, the free bearing on the workpiece support device is also retracted to a position where it is not contaminated by spatter. This will be explained with reference to FIGS. 9 and 10.

In a laser processing machine similar to that of the first embodiment, a binion 22 and a bin 24 are fixed to both ends of a workpiece support device provided with a large number of free hair rings 3, and the bin 24 is attached to a shaft 5.
By supporting the workpiece support device 4 at one end of the bin 24, the workpiece support device 4 can freely rotate about the bin 24. Also,
Similar to the first embodiment, a spring 6, a collar 7, and a roller 8 are provided on the shaft 5 and attached to the table. The cam 9 is also installed in the same position so that when the table 1 or the column 15 moves, the work supporting device 4 near the processing head 11 is lowered.

In addition, binions 2 provided at both ends of the workpiece support device 4
2 and in a state parallel to the shaft 5.
3 and fix one end of it to table 1. 10th
As shown in the figure, when the pinion 22 is moved on the fixed rack 23, the pinion 22 rotates by 1/2 rotation during the lifting and lowering stroke of the workpiece support device 4.

When this workpiece mounting device approaches the processing head 11, the workpiece support device 4 descends and rotates at the same time, and the workpiece support device is in an inverted state 1806 at its lower limit of descent. That is,
As the workpiece support device 4 is retracted, the free bearing 3 that was in contact with the workpiece is reversed. Therefore, the workpiece support device 4
It is possible to prevent damage caused by the laser beam, and to prevent the free bearing 3 on the workpiece support device 4 from being contaminated by spatter.

[Third Embodiment] This embodiment is an embodiment in which the cam 9 of the first embodiment is replaced with a guide plate and a device for raising and lowering the guide plate. This will be explained below with reference to FIGS. 11 and 12.

As in the first embodiment, both ends of the workpiece support device 4 are fixed to one end of the shaft 5, and the shaft 5 is inserted into the guide hole of the table 1.
Insert it so that it can slide freely. On the other hand, a roller 8 is rotatably supported at the other end of the shaft 5, and is mounted on a guide rail 30 provided parallel to the direction of the arrow X in FIG. Allow the roller 8 to slide.

Further, a guide plate 26 that can be raised and lowered is provided at a position where the movement axis of the processing head 11 in the direction of arrow Y in FIG. 1 intersects with the guide rail 30. This guide plate 26
can be raised and lowered by a lifting device 29 such as an air cylinder, and the guide plate 26 and the lifting device 29 move in unison with the column 15 like the guide rail 30.

In this workpiece placement device, when the tear-pull 1 or the column 15 is moved, the roller 8 on the guide rail 30 comes into contact with the guide plate 26, and the sensor 27
Or the sensor 28 detects the passage of the roller 8,
In response to this detection signal, the lifting device is lowered, and the work supporting device 4 including the rollers 8 is lowered. When the roller 8 or the guide plate 26 moves further, the passage of the roller 8 is again detected by the sensor 27 or the sensor 28, and this detection signal causes the lifting device to rise to the same height as the guide rail 30, and the work supporting device 4 returns to the direction supporting the workpiece.

Therefore, by lowering the workpiece support device 4 that is close to the processing head 11, damage caused by the laser beam can be prevented. In addition, it would be even more effective to combine the mechanism of the first embodiment for protecting the free bearing with a cover or the like, or the mechanism of the second embodiment for protecting the free bearing by inverting the workpiece support device.

〔Effect of the invention〕

As described in detail above, in this invention, when the laser beam approaches the workpiece support, the workpiece support before and after the laser beam emission position is automatically retracted, so that the workpiece is supported without damage to the workpiece support. This also eliminates contamination of the workpiece due to the rebound of damaged parts.

In addition, the table of a conventional laser processing machine requires two devices: a workpiece support device and a workpiece lift mechanism equipped with a free bearing, but by making the workpiece support part a free bearing, In addition to eliminating the need for a lift mechanism, the free bearings on the workpiece lift mechanism can be arranged closely, so that when positioning a large workpiece on the table, the workpiece slides smoothly and becomes easy to position.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is an overall plan view of a laser processing machine, FIG. 2 is an enlarged view of the vicinity of a workpiece mounting device that uses a cam to retract a workpiece support device, and FIG. Figure 2 is a side view, Figure 4 is an enlarged view of the protective cover device, and Figure 5 is an enlarged view of the protective cover device.
The figure is a side view of Fig. 4, Fig. 6 is an enlarged view of the vicinity of the workpiece mounting device equipped with a lifting device on the cam, Fig. 7 is a side view of Fig. 6, and Fig. 8 is a reversal of the workpiece support device. An enlarged view of the vicinity of the workpiece placement device, FIG. 9 is a diagram showing the mechanism for reversing the workpiece support device, FIG. 10 is a side view of FIG. 9, and FIG. 11 is a workpiece in which the workpiece support device is evacuated by a dowel plate. An enlarged view of the vicinity of the mounting device, FIG. 1211-, is a side view of FIG. 11. 1 is a table, 2 is a workpiece, 4 is a workpiece support device, 11
15 is a processing head, 15 is a column, and 16 is a protective cover.

Claims (2)

[Claims] (1) A mechanism for retracting a workpiece support at a position where a laser beam is emitted in a laser processing table;
A workpiece mounting device with a free bearing placed in the workpiece support part of the mechanism. (2) The workpiece mounting device according to claim 1, wherein the free bearing is retracted to a position where it will not be contaminated by spatter or the like, or a protective cover for the free bearing is provided in the position where the workpiece support part is retracted.