JPH0435028Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a hand-held laser processing device.

(Prior art) Laser processing equipment must accurately position the workpiece at the focal point of the condensing lens of the laser beam, so most laser processing equipment is dedicated to a specific workpiece. It was hot. but,
Recently, simple hand-held laser processing devices have come into use in place of the above-mentioned dedicated devices.

Here, since the laser beam has a high energy density, it is important to protect it from a safety standpoint, and in particular, care must be taken to prevent the eyes from being irradiated directly or indirectly.

(Problem that the invention aims to solve) However, with hand-held laser processing equipment, when setting the processing position of the workpiece, it is necessary to position the workpiece based on the point where the laser beam is focused, and Protection was difficult.

The purpose of this invention is to provide a laser processing device that not only allows easy visual confirmation of the position of the workpiece but also improves safety and workability by shielding the laser light from the outside during irradiation. It is about providing.

[Structure of the idea]

(Means for Solving the Problems) The present invention provides a laser beam irradiation part and a condensing lens within a main body, and is held at the focal position of the condensing lens by a holding mechanism attached to the main body. In a laser processing device that processes a workpiece by irradiating it with laser light, the main body is provided with a light-shielding cover that can be opened and closed to block the irradiated laser light from the outside when closed;
A light-shielding cover driving mechanism is provided that closes the light-shielding cover when the workpiece is held by the holding mechanism.

(Function) In the present invention, when the workpiece is held in the holding mechanism, the light-shielding cover is closed, and even if the workpiece is subsequently irradiated with laser light, the laser beam is not irradiated to the outside. , creating a sufficient protection mechanism for workers etc.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings.

In the figure, 11 is a main body, and an optical fiber 12 for guiding laser light is inserted into one end of the main body. On the input side (not shown) of the optical fiber 12, there is a condenser that receives the laser beam from the laser oscillator. The light is introduced into the main body 11 and irradiated from the irradiation part 12a at the fiber outlet fixed to the intermediate part within the main body 11.

A condensing lens 13 is provided at the other end of the main body 11 together with a cover glass 14, and condenses the laser beam irradiated from the irradiation section 12a at the exit of the fiber.

A holding mechanism 16 is attached to the main body 11 in a predetermined positional relationship in order to hold the workpiece 17 at the focal position of the condensing lens 13. That is, this holding mechanism 16 holds the receiving member 1
8 and a holding member 19, and the receiving member 18 is integrally held by a bracket 20 provided at the lower part of the main body 11. This receiving member 18 is bent into a dogleg shape as shown in the figure, and its tip end is attached to the receiving portion 18 of the workpiece 17.
It becomes a.

The pressing member 19 has a dogleg shape as shown in the figure,
The middle part is connected to the bracket 20 by a support shaft 23.
is rotatably connected to. The workpiece 17 is held under pressure by the holding part 19a at the tip thereof together with the receiving part 18a.

Reference numeral 25 denotes an operation lever, which is formed in a dogleg shape, and whose middle part is rotatably connected to the main body 11 by a support shaft 27, and whose lower end is rotatably connected to the illustrated upper end of the presser member 19 via a pin 28. Connect movably. The operation lever 25 is operated by a compression spring 26 provided between the outer surface of the main body 11 and a rotation force in the clockwise direction in the figure about the support shaft 27, that is, the distal end presser portion 19a of the presser member 19 is applied to the receiving member. 1
8 receives an acting force in the direction of separating it from the tip receiving portion 18a.

An air passage 30 is formed in the presser member 19, and one end thereof opens to the presser portion 19a.
A compression switch (not shown) is provided in the air passage 30, and when the workpiece 17 is placed on the holding portion 19a, a pressure change occurring in the air passage 30 is detected and an output signal is generated.

Reference numeral 32 denotes a light-shielding cover, which is provided so as to be openable and closable with respect to the main body 11, and when closed, shields the laser beam irradiated toward the workpiece 17 from the outside. Reference numeral 33 denotes a light-shielding cover drive mechanism, which has an air cylinder 35 operated by compressed air from an air pipe 34 as a drive source. An actuating rod 36 of this air cylinder 35 is rotatably connected to an intermediate portion of an arm 37. Further, one end of the arm 37 is rotatably supported by the bracket 20 via the support shaft 23, and the other end is connected to the light shielding cover 32 via a pin 38. And air cylinder 3
5, the light-shielding cover 32 is driven into the closed state shown by the solid line in FIG. 2 and the open state shown by the two-dot chain line.

Note that this drive mechanism 33 is
is held by the holding mechanism 16, a pressure change occurs in the air passage 30 within the holding member 19, and the pressure switch operates when this is detected. Further, the laser beam is irradiated when a sensor (not shown) detects that the arm 37 has reached a predetermined position, that is, a position where the light shielding cover 32 is in a closed state.

In the above configuration, in order to perform laser welding, for example, two workpieces 17 are set between the receiving part 18a of the receiving member 18 and the holding part 19a of the holding member 19, and the operating lever 25 is connected to the compression spring 26. When the presser member 19 is rotated counterclockwise in the figure against the resistance, the presser member 19 rotates clockwise in the figure around the support shaft 23, and the presser member 1
9a presses the workpiece 17 and fixes it at a predetermined processing position. This operation turns on the pressure switch communicating with the air passage 30 of the holding member 19, as shown in FIG. 3, and starts a timer (not shown). After the set time of this timer has elapsed, the air cylinder 35 is operated and the light shielding cover 32 is closed for a predetermined operating time. When the closing operation of the light-shielding cover 32 is completed, the position of the arm 37 at that time is detected by a sensor, and a laser trigger signal is output to a laser oscillator (not shown). This signal causes the laser oscillator to operate, and irradiates the laser beam transmitted through the optical fiber 12 from the irradiation section 12a. This laser light is focused by a condenser lens 13 and applied to the workpiece 17 to weld it. At this time, the light shielding cover 32 is closed, and the laser light applied to the workpiece 17 is shielded from the outside. Therefore, workers and the like are not exposed to laser light, and a sufficient protective function is achieved.

After processing, when the operating lever 25 is released, the presser member 19 returns to its original position due to the repulsive force of the compression spring 26, the workpiece 17 is removed, the pressure switch is also turned off, and the air cylinder 35 is turned off after a predetermined return time. The recovery works. Therefore, the light-shielding cover 32 becomes open as shown by the two-dot chain line in FIG. 2, and the next workpiece 17 can be positioned with respect to the holding mechanism 16.

In the above description, laser welding is exemplified as laser processing, but various processing such as drilling, trimming, and heat treatment using laser light is possible by adjusting the laser output and focal length. Further, by considering the shape of the holding mechanism 16 for the workpiece 17 in accordance with the workpiece, it is possible to irradiate the workpiece 17 of various shapes with laser light from an optimal direction. In addition, the workpiece 17
What detects the state of holding in the holding mechanism 16 is as follows:
It is not limited to pressure switches, but proximity switches, charging switches, limit switches, etc. may be selected according to the workpiece.

[Effect of idea]

As described above, according to the present invention, the workpiece can be easily held at the focus position of the laser beam by the holding mechanism, and the laser light irradiated onto the workpiece is shielded from the outside by the light-shielding cover. , workers etc. can be reliably protected from laser light.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the laser processing apparatus according to the present invention, FIG. 2 is a side view of FIG. 1, and FIG.
The figure is a time chart explaining the operation of the present invention. DESCRIPTION OF SYMBOLS 11... Main body, 12a... Laser beam irradiation part, 13... Condensing lens, 16... Holding mechanism,
17...Workpiece, 32...Shading cover, 33...
...shading cover drive mechanism.

Claims (1)

[Claims for Utility Model Registration] A laser beam irradiation part and a condensing lens are provided in a main body, and a laser beam is applied to a workpiece held at the focal position of the condensing lens by a holding mechanism attached to the main body. A laser processing device that performs processing by irradiating light, comprising: a light-shielding cover that is openable and closable on the main body and blocks the irradiated laser light from the outside when closed; and a workpiece held in the holding mechanism. A laser processing apparatus comprising: a light-shielding cover driving mechanism that closes the light-shielding cover when the light-shielding cover is held.