JPS632582A - Closing device for opening part allowing movement of focus head - Google Patents

Abstract

PURPOSE:To miniaturize a laser beam machine by winding both end part of the closing belt linked with a focus head on a rotary shaft and tensing the closing belt by pulling out a connection wire from each rotary shaft with the tension of the connection wire. CONSTITUTION:The laser light L emitted from a laser oscillator 1 is radiated in the horizontal direction into a cover case 5 via plural reflection mirrors 3 and pipe 4. The laser light L then projects the body to be machined of the above of a work table 9 from a focus head 6 via a reflection mirror 8. The passing route of the laser light L is shielded from the air by the cover case 5 and closing belts 11, 12. With the focus head 6 being driven, the closing belt 11 is pulled out of the rotary shaft 13 of one part in accordance therewith and simultaneously the closing belt 12 is wound on the rotary shaft 14 of the other part, and the inside of the case becomes in a sealing state. In this way, even the machine having a bigger moving stroke of the focus head can be made in a small sized closing device.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a focus head for a laser processing machine, and more specifically, to a method for sealing the passage of a laser beam by closing an opening that allows movement of the focus head. The present invention relates to a closed m device configured to do so.

"Prior Art" In general, in laser processing machines, the passage path of the laser beam formed between the laser oscillator that oscillates and emits the laser beam and the focus head that irradiates the workpiece with the laser beam is sealed from the atmosphere. This prevents atmospheric dust and the like from entering the path of the laser beam. The focus head is housed in a covering case, and a part of the focus head protrudes outside through an opening formed in the covering case along the moving direction of the focus head to enable laser beam irradiation. , and the opening is closed by a closing device to seal the inside of the covering case.

Conventionally, as an opening closing device that allows movement of the focus head, one end of a closure belt that closes the opening is connected to both sides of the focus head, and the other end of each closure belt is wound. Wrap it around the take-up reel with the tension of a take-up spring, follow the operation of the focus head, pull out one closure belt from the take-up reel, wind the other closure belt with the tension of the take-up spring, A closing device that permanently closes the opening is known.

``Problems to be Solved by the Invention'' However, in such a configuration, not only the life of the take-up spring is short, but also the take-up spring is capable of winding up the closure belt by an amount corresponding to the movement stroke of the focus head. Therefore, the take-up spring is large and expensive, especially in the case of a focus head with a long travel distance.

"Means for Solving the Problems" In view of the above circumstances, the present invention has been developed by winding both ends of the closure belt connected to the focus head around the rotating shaft, and loosening the connecting wire by the required amount. In this state, both ends of the closing belt are wound around each of the rotating shafts from the opposite direction, and a tension means is provided to apply a predetermined tension to the connecting wire, and the tension causes each of the rotations. A connecting wire is pulled out from the shaft to tension the closure belt.

"Operation" According to such a configuration, when the focus head is moved in one direction, the closure belt on one side connected to the focus head follows it and is pulled out from the rotating shaft,
When the rotating shaft is thereby rotated, the connecting wire, which is wound around the rotating shaft from the direction opposite to that of the closure belt, is wound around the rotating shaft. When one end of the connecting wire is wound around the rotating shaft, the other end of the connecting wire is pulled out from the other rotating shaft, and when the other rotating shaft is rotated by pulling out the connecting wire, the connecting wire In this case, a closure belt is wound around the rotating shaft from the opposite direction.

In this way, the driving force for the rotating shaft on the winding side of the closure belt is supplied from the other rotating shaft on the pull-out side via the connecting wire. Therefore, even if the amount of wrapping of the closure belt to be wrapped around each rotating shaft becomes large, this can be dealt with by simply increasing the length of the connecting wire, so the entire device can be made more compact than before. can.

``Embodiment'' The present invention will be described below with reference to the illustrated embodiment. In FIG. 2, a laser oscillator 1 is fixed to the upper part of a portal frame 2, and the laser beam from the laser oscillator 1 is as follows.
The light is emitted horizontally into a covering case 5 disposed below the laser oscillator 1 via a plurality of reflecting mirrors 3 and a vibrator 4 that accommodates and supports each reflecting mirror 3.

As shown in FIG. 3, a focus lens 6 is housed in the covering case 5, and the focus lens 6 is disposed in the covering case 5 parallel to the radiation direction of the laser beam. It is movably supported by the guide rail 7 and reciprocated in its longitudinal direction by a screw shaft (not shown) disposed parallel to the guide rail 7 and a servo motor interlocked with the screw shaft. An opening 5a is formed in the bottom surface of the cover case 5 housing the focus head 6 along the direction of movement of the focus head 6, and the lower part 8 of the focus head 6 is passed from the opening 5a to the focus head 6.
A is made to protrude downward.

As shown in FIG. 2, the focus radar 6 includes a reflection @8 that reflects downward the laser beam emitted horizontally within the covering case 5, and a reflection @8 that condenses the laser beam. It is equipped with a condensing lens that does not allow laser light to emit light from the lower part 8a of the focus head 6! ! It is possible to irradiate aL onto a workpiece (not shown) on the processing table 9. The processing table 9 is movable along a guide rail 10 laid in a horizontal plane in a direction perpendicular to the direction of movement of the focus head 6.

As shown in FIGS. 1 and 2, the focusing rod 6, which projects downward from the opening 5a of the covering case 5, has a pair of closing belts 11. 12 are connected to each other, and the other end of each closure belt 11.12 is wound around a pair of rotating shafts 13.14 pivotally supported at both ends in the longitudinal direction within the covering case 5. As shown in FIG. 3, the closing bells 11 and 12 are slidably placed on sealing members 15 made of felt or the like provided on the upper surface of both sides in the longitudinal direction of the opening 5a, thereby closing the opening 5a. The inside of the covering case 5 is sealed with bells) 11 and 12.

Furthermore, as shown in FIG. 1, both ends of one connecting wire 1B are wound around the rotating shafts 13.
The direction in which the closure belts 11.12 are wound around the rotating shaft 13.14 is opposite to the direction in which the closure belts 11.12 are wound around the rotating shaft 13.14. A predetermined amount of slack is given to the connecting wire 1B in advance, and at the same time, a predetermined tension is applied to the connecting wire IB by a pair of tension means 17 provided at an intermediate position of the rotating shaft 13,14. .

In this embodiment, each tension means 17 includes a fixed roller 18
and a tension roller 19, the connecting wire 18 is wound around each roller 18, 19 in an S-shape, and the S-shaped portion gives a predetermined amount of slack to the connecting wire 1B. Pair of tension rollers 1
By pulling the wire 9 with a tension spring 20, a predetermined tension is applied to the connecting wire 16.

When both ends of the connecting wire 16 are pulled out from the rotating shafts 13.14 under the tension of the tension springs 20, each rotating shaft 13.14 is thereby rotated in the drawing direction. However, each axis of rotation 13.14
Since the closing belt 11.12 is wound in the opposite direction to the direction of the connecting wire 18, each rotating shaft 13.1
4 is rotated in the direction of withdrawal of the connecting wire 1B, each closure belt 11.12 is wound around each rotation shaft 13.14, and each closure belt 11.12 is wound around each rotation shaft 13.
．． 14 and the focus rod 6, the rotation of each rotating shaft 13, 14 is stopped, so that the connecting wire 16 is also tensioned with a constant tension.

According to the above configuration, the passage path of the laser beam includes the laser oscillator 1, the pipe 4, the covering case 5, and the closed bell).
11.12, it will be shielded from the atmosphere. When the focus rad 6 is moved, for example, to the right in FIG. Therefore, it is pulled out from the rotating shaft 13. Then, the rotating shaft 13 is connected to the closing belt 1
The connecting wire IB is wound around the rotating shaft 13 due to the rotation.

Next, when one end of the connecting wire 16 is wound around the rotating shaft 13, the other end of the connecting wire 1B is pulled out from the rotating shaft 14. When the rotating shaft 14 is rotated and the rotating shaft 14 is further rotated as the connecting wire IB is pulled out, this rotating shaft 14
The closure belt 12 will be wound up.

At this time, the diameters of the closing bells (11.12) wound around each rotating shaft 13.14 are usually different, so there is a difference in the amount of rotation between the rotating shafts 13.14, and therefore the connecting wire 16 fluctuates, but the fluctuation in slack is absorbed by the displacement of the tension roller 19.
At all times, the tension in the connecting wire 1G and the closing belt 11.12 is kept constant.

In this way, when the radar 6 is moved in one direction to the focus, the closing belt 11 is pulled out from one rotating shaft 13 and at the same time, the closing belt 12 is wound around the other rotating shaft 14. The interior of the case 1 is always kept sealed by the reclosing belts 11, 12.

The driving force of the rotary shaft 14 on the winding side is transmitted and supplied from the other rotary shaft 13 on the drawer side via the connecting wire 16, so that the movement stroke of the rad 6 to the focus is greatly reduced. Even if the amount of winding (closing bell) 11.12 to be wrapped around the rotating shaft 13.14 is increased, it can be dealt with by simply increasing the length of the connecting wire 1B. becomes.

In the above embodiment, the closing belt 11.12 and the connecting wire 16 are wound around each rotating shaft 13.14, but for example, the closing belt 11.12 and the connecting wire 16 are wound around the rotating shaft around which the closing bell 11.12 is wound. It is also possible to use another rotating shaft disposed in a direction orthogonal to the rotating shaft around which the wire 16 is wound, and to interlock both rotating shafts with a universal joint. Further, the tension means 17 is not limited to the configuration shown in the illustrated embodiment, and it is obvious that any suitable configuration can be adopted, and the connecting wire in the present invention may include a wide belt-like one. There is.

"Effects of the Invention" As described above, according to the present invention, it is possible to provide a small-sized closing device even for a laser processing machine in which the moving stroke of the focus head is long.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram showing one embodiment of the present invention, Fig. 2 is a front view showing the entire laser processing machine, and Fig. 3 is a -
■It is a sectional view along the line. 1...RefJ? [W 2... Gate-shaped frame 5... Covering case 5a... Opening 6...
Focus head 6a... Lower part 11, 12... Closing bell) 13.14... Rotating shaft 16... Connection wire 17... Tension means 18... Fixed roller 19... Tension roller 20...
Tension spring L...Laser beam Figure 2 Figure 3

Claims (1)

[Claims] A focus head that irradiates a workpiece with a laser beam;
A cover case that movably and hermetically stores the focus head, an opening formed in the cover case along the moving direction of the focus head, and a closing belt that closes the opening, The focus head is configured to project outward from the opening, and connect the closure belt to the focus head, and operate the closure belt in accordance with the operation of the focus head to constantly close the opening. In an opening closing device that allows movement of the focus head, both ends of the closure belt connected to the focus head are wound around the rotating shaft, and with the connecting wire loosened by the required amount, both ends are connected to each of the above positions. The closing belt is wound around the rotating shaft in a direction opposite to the winding direction of the closure belt, and is further provided with a tension means for applying a predetermined tension to the connecting wire, and the connecting wire is pulled out from each of the rotating shafts by the tension, thereby tightening the closing belt. An opening closing device for allowing movement of a focus head, characterized in that the opening is tensioned.