JPH0249193B2 - - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a laser processing device,
In particular, the present invention relates to a laser processing device that scans a laser beam to cut a strip-shaped workpiece such as cloth or leather.

<Prior art> Conventional laser processing equipment generally continuously supplies a roll of raw material from a fabric spreading device to a cutting conveyor placed horizontally on the downstream side, and applies laser light to the fabric spread on the cutting conveyor. The parts are cut into predetermined shapes while being irradiated with light, and the parts are separated and the remaining scraps are collected and processed in a scrap processing device located downstream.

Further, the laser light reaches the laser head from a laser oscillator placed on one side of the cutting conveyor via a light guiding means constituted by an optical system,
The fabric on the cutting conveyor will be irradiated with focused light. This laser head was attached to a frame that straddled the cutting conveyor, and laser light from this laser head was scanned vertically and horizontally while irradiating the fabric to obtain parts of a predetermined shape from the fabric. .

Furthermore, as described in Japanese Patent Application Laid-open No. 60-206591, a workpiece is wrapped around a cylinder that swings around an axis, and a light condensing device that travels along a straight line parallel to the workpiece outside the cylinder. There is a laser processing device that cuts a workpiece by irradiating a laser beam from the device.

<Problems to be Solved by the Invention> However, according to the above-mentioned general laser processing device, the laser head scans a horizontally arranged cutting conveyor to cut parts of a predetermined shape from the fabric, and continuously cuts parts of a predetermined shape from the fabric at the same level. Since the laser processing apparatus is caused to flow down onto a horizontal conveyor located at a certain location, the horizontal distance from the upstream end of the cutting conveyor to the downstream end of the horizontal conveyor becomes long, and a large floor space is required for the laser processing apparatus. Moreover, when the fabric is fed from the original roll to the cutting conveyor, the fabric does not spread out sufficiently on the cutting conveyor, leaving wrinkles inside, making it difficult to obtain the exact shape of the cut product parts. Ta.

Additionally, laser processing equipment that wraps the workpiece around the outer periphery of a cylinder and cuts it can reduce the floor space it occupies compared to processing equipment that has a horizontally arranged cutting conveyor. When processing workpieces that are difficult to fully develop and still have wrinkles or curved surfaces,
Machining accuracy was poor. Moreover, the size of the workpiece is restricted by the curvature of the cylinder.

The present invention has been made to solve the above-mentioned problems, and it aims to reduce the floor space occupied by a laser processing device, prevent wrinkles from forming on the workpieces on the conveyor, and achieve high processing precision. This paper proposes a laser processing device.

<Means for Solving the Problems> The present invention cuts the workpiece into a predetermined shape by two-dimensionally scanning the belt-shaped workpiece being transported on a conveyor while irradiating it with a laser beam. In laser processing equipment, the upstream conveyor located in the laser beam scanning range is arranged perpendicular to the downstream conveyor, or the upstream conveyor located in the laser beam scanning range is arranged at an acute angle to the downstream conveyor. It is characterized by being arranged as follows.

<Function> According to the present invention, the fabric, which is the workpiece fed downward from the raw fabric roll, hangs down due to its own weight, so that it is sufficiently unfolded and wrinkles are suppressed as much as possible. Since this fabric is further adsorbed to the upstream conveyor, wrinkles are unlikely to remain on the fabric adsorbed to the upstream conveyor, and the fabric can be accurately cut along a predetermined shape.

Furthermore, the upstream conveyor that scans the laser beam is arranged perpendicularly or at an acute angle to the downstream conveyor that transfers the processed fabric, reducing the floor space occupied by the laser processing equipment. be able to.

<Example> The present invention will be explained below based on FIGS. 1 to 3. In the figure, 1 is a vertically arranged upstream conveyor, and this upstream conveyor 1 has a raw material roll 2.
A dough 4 is supplied as a workpiece from the roller 3 via the roll 3. This roll 3 pulls out the fabric 4 from the raw fabric roll 2, and also pulls out the fabric 4.
I try to measure the dimensions of. Reference numeral 5 denotes a laser oscillator disposed adjacent to the upstream conveyor 1, and the laser beam 6 from the laser oscillator 5 reaches a bent mirror 8 via a light guiding means 7. in the direction indicated by the dashed line
Bent 90°. This laser beam 6 is irradiated onto a convex mirror 9 disposed opposite to a bent mirror 8, and the beam diameter is expanded. Next, the beam reaches a concave mirror 10 paired with the convex mirror 9, and the beam becomes an expanded parallel beam. The laser beam 6 expanded in this way is condensed by a condenser lens 11 and reaches a mirror swinging device 12 equipped with a swinging reflecting mirror (not shown), and the laser beam reflected by this reflecting mirror The light 6 is irradiated to the fabric 4 on the upstream conveyor 1 in a high-density energy state. Note that the distance from the reflecting mirror to the irradiation point on the upstream conveyor 1 changes depending on the position of the irradiation point, so in order to correct this change, the lens driving device 13 moves the condenser lens 11 in the optical axis direction. move it. The laser beam 6 irradiated in this manner is scanned vertically and horizontally on the cloth 4 by a mirror swinging device 12 so as to form a predetermined shape, and the cloth 4 is cut into product parts 4a. The cut-out product part 4a is adsorbed to the upstream conveyor 1 by an exhaust means (not shown) of the upstream conveyor 1, and the smoke generated when cutting the product part 4a is exhausted by this exhaust means. Ru.

In addition, in the optical system described above, a convex mirror 9, a concave mirror 10, and a condensing lens 11, which are beam expanding means, are used.
The spot diameter of the laser beam 6 irradiated onto the fabric 4 by the laser beam 6 expanded by the concave mirror 10 is
If the beam diameter is D, the focal length of the condensing lens 11 is F, and the spot diameter on the fabric 4 is d, then the relationship d=K・F/D (K is a constant) is established, and the spot diameter d is It can be seen that in order to reduce the beam diameter, the beam diameter D should be increased.

Note that 14 is a shielding plate that prevents the laser beam 6 from passing through the upstream conveyor 1, 15 is a cover that forms a cutting chamber, and 16 is a frame on which an optical system is placed.

Further, 17 is a downstream conveyor 17 extending horizontally from the downstream end of the upstream conveyor 1, and this downstream conveyor 17 is also equipped with an exhaust means similar to the upstream conveyor 1, and the downstream conveyor 17 is provided with an exhaust means as well as the upstream conveyor 1. The fabric 4 (product parts 4a and scraps 4b) is attracted to the downstream conveyor 17, and only the scraps 4b are accumulated in the scrap processing device 18 disposed at the downstream end, and the product parts 4a are manually picked up and separated. I'm starting to let them do it.

Incidentally, the mirror rocking device 12 of the laser processing device
is driven and controlled by a control means (not shown), and this drive control is performed according to a program according to the shape of the product part 4a.

With the above configuration, the fabric 4 of the raw fabric roll 2 is pulled out by the action of the roll 3 and is supplied to the upstream conveyor 1 through the gap formed between the cover 15 and the upstream conveyor 1 so as to be adsorbed thereto. . At this time,
The fabric 4 is stretched downward by its own weight and many wrinkles are removed. Then, this fabric 4 is attracted to the upstream conveyor 1 and is spread out on the upstream conveyor 1 in a state with even fewer wrinkles. On the other hand, in parallel with this, the laser beam 6 irradiated from the laser oscillator 5
passes through the light guiding means 7, the bent mirror 8, and then the convex mirror 9,
The beam reaches the concave mirror 10, the beam diameter D of the laser beam 6 is expanded, and the beam passes through the condenser lens 11. The transmitted light is focused so as to have a predetermined spot diameter d, and is irradiated onto the fabric 4 through the reflecting mirror of the mirror swinging device 12 as a spot diameter d. The irradiated laser beam 6 is scanned so as to draw a predetermined shape on the cloth 4 by a mirror swinging device 12 which is driven according to a command from a control means. The product parts 4a cut by the laser beam 6, together with the scraps 4b,
The product parts 4a are transferred from the upstream conveyor 1 to the downstream conveyor 17, where they are separated and taken out, and the scraps 4b are accumulated in a scrap processing device 18.

Note that FIG. 2 is a schematic side view of FIG. 1.

As described above, according to the present invention, since the fabric 4 is fed while falling under its own weight, the wrinkles in the fabric 4 are extended by its own weight, and when it is adsorbed on the upstream conveyor 1, there are very few wrinkles. It has become a state. Therefore, by cutting this wrinkle-free fabric 4 along a predetermined shape, a product part 4a having an accurate shape can be obtained.

Furthermore, since the upstream conveyor 1 is arranged vertically, it is possible to reduce the floor space occupied by the laser processing device.

In FIG. 3, the upstream conveyor 1 is arranged at an acute angle with respect to the downstream conveyor 17. Components having the same configuration as those of the invention shown in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted.

According to the invention having such an arrangement of the upstream conveyor 1 and the downstream conveyor 17, it is possible not only to sufficiently roll out the fabric 4 without wrinkles and obtain a product with high processing accuracy, but also to obtain a product with high processing accuracy. A new effect can be achieved in that the upper space of the vehicle can be saved.

<Effects of the Invention> According to the present invention, the wrinkles of the workpiece to be cut, such as cloth, can be smoothed out by the weight of the workpiece, and the workpiece can be processed without wrinkles. Products with good processing accuracy can be obtained.
Further, the present invention can reduce the floor area occupied by the processing device, and can effectively utilize the space above the processing device, so it has extremely high practical value.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a laser processing apparatus according to the first invention, and FIG. 2 is a schematic side view showing features of the same. FIG. 3 is a schematic side view showing the second invention. 1...Upstream conveyor, 4...Dough as a workpiece, 6...Laser light, 17...Downstream conveyor.

Claims (1)

[Scope of Claims] 1. A laser processing device that cuts a belt-shaped workpiece transported on a conveyor into a predetermined shape by irradiating a laser beam and scanning the workpiece two-dimensionally, comprising: A laser processing device characterized in that an upstream conveyor located in a laser beam scanning range is arranged perpendicularly to a downstream conveyor. 2. In a laser processing device that cuts a belt-shaped workpiece being transported on a conveyor into a predetermined shape by two-dimensionally scanning the workpiece while irradiating it with a laser beam, a range over which the laser beam scans the workpiece. A laser processing device characterized in that an upstream conveyor located at is arranged at an acute angle with respect to a downstream conveyor.