Laser marking apparatus

Abstract

The present invention relates to a laser marking apparatus, and provides a laser marking apparatus comprising: a laser head unit including a laser head for irradiating a laser beam toward an object to be marked so as to imprint a mark on a surface of the object to be marked; and a spatter cover coupled to the lower end of the laser head unit in a direction toward the object to be marked and formed to surround the outer circumference of a point to which the laser beam is irradiated and block the corresponding point from the outside while the laser beam is irradiated to the object to be marked.

Description

Laser marking device

[0001] The present invention relates to a laser marking device. More specifically, the present invention relates to a laser marking device that prevents a laser beam from being diffusely reflected externally during a laser marking process, while simultaneously preventing spatter from flying externally from the processing surface of a marking target, thereby ensuring the safety of the operator and preventing pollution of the surrounding environment.

[0002] Lasers are being used not only for grooving, drilling, and cutting objects, but also as marking devices. Unlike conventional methods like drilling and etching, laser marking allows for precise marking while minimizing physical and chemical damage to the object.

[0003] Laser marking is widely used, especially in fields such as product production history management and traceability management, and can be applied to various materials such as metals, non-metals, ceramics, plastics, organic materials, and semiconductors.

[0004] Recently, laser marking techniques are also being applied to marking vehicle identification numbers on automobiles.

[0005] The vehicle identification number contains information that can identify a vehicle and is used to prevent vehicle theft and track vehicle defects. It is usually located on the vehicle's dash panel, cross member, or upper part of the firewall.

[0006] These vehicle identification numbers are made by engraving marks such as letters or numbers on a flat surface of a metal material, and a laser marking technique is applied in the process of engraving the marks.

[0007] The laser marking technique used to produce vehicle identification numbers typically involves irradiating a laser beam onto the machined surface of a metal plate, locally melting the surface and engraving the area. This process involves discontinuously irradiating the laser beam so that the locally melted area forms a dot. Multiple adjacent dots are then continuously formed to form a single mark.

[0008] This laser marking process locally melts the surface of the object being marked using a laser beam. Consequently, numerous spatters, or melt fragments, are formed on the surface during the marking process. This formation of spatters on the surface reduces the clarity of the mark and can lead to errors in mark recognition using imaging devices such as cameras.

[0009] Therefore, in order to prevent spatters from forming on the processing surface during the laser marking process, a method of spraying gas on the processing surface to scatter spatters is generally applied.

[0010] In this way, when spatter is scattered to the surroundings by the gas injection pressure, there is a problem that the surrounding work environment becomes polluted and the environment within the workplace deteriorates.

[0011] Furthermore, during the laser marking process, when a laser beam is irradiated onto a work surface, it diffusely reflects off the work surface and spreads in all directions. This reflected light can cause eye damage if it strikes the operator's eyes. Therefore, to ensure worker safety, laser marking work is performed within a separate shielded house.

[0012] Installing a separate shielding house for laser marking work like this not only incurs additional installation costs, but also causes various problems such as reduced efficiency of the work space.

[0013] The present invention was invented to solve the problems of the prior art, and the purpose of the present invention is to provide a laser marking device that can prevent a laser beam from being diffusely reflected to the outside during a laser marking process and at the same time prevent spatter from being scattered to the outside from the processing surface of a marking target, thereby ensuring the safety of a worker without installing a separate shielding house, improving the efficiency of a work space, and preventing pollution of the surrounding environment.

[0014] Another object of the present invention is to provide a laser marking device capable of cleaning the spatter cover through a separate cover cleaning unit, thereby extending the life of the spatter cover and more stably maintaining the spatter blocking function and the laser beam reflection blocking function.

[0015]

[0016] The present invention provides a laser marking device comprising: a laser head unit including a laser head that irradiates a laser beam toward a marking target so as to engrave a mark on the surface of the marking target; and a spatter cover that is coupled to a lower end of the laser head unit in a direction toward the marking target and is formed to surround the outer perimeter of a point where the laser beam is irradiated while the laser beam is irradiated to the marking target and block the point from the outside.

[0017] At this time, the spatter cover may be formed in a hollow column shape with the lower surface adjacent to the marking target being open.

[0018] In addition, a laser case is provided that surrounds the outer space of the laser head unit so that the laser head unit can move in the inner space, and the spatter cover is coupled to the lower part of the laser head unit so that it can move together with the laser head unit.

[0019] Additionally, the lower portion of the laser case may be equipped with a blocking curtain that surrounds the outer space of the spatter cover and extends downward to contact the processing surface of the marking target.

[0020] Additionally, a separate suction device capable of sucking the internal space of the blocking curtain may be connected to one side of the blocking curtain.

[0021] Additionally, a plurality of cutouts may be formed at the lower end of the spatter cover adjacent to the surface of the marking target.

[0022] In addition, the above-mentioned cut portion may be formed in a partially cut shape along the axial direction of the spatter cover and may be formed in multiple numbers spaced apart along the circumferential direction.

[0023] Additionally, the laser marking device may further include a cover cleaning unit capable of removing spatter and foreign substances attached to the inner surface of the spatter cover.

[0024] In addition, the cover cleaning unit may include a brush that is formed to be insertable into the inside of the spatter cover so that the outer surface thereof contacts the inner surface of the spatter cover; and a rotation driving unit that rotates the brush so that the outer surface of the brush scrapes the inner surface of the spatter cover.

[0025] Additionally, the cover cleaning unit may further include an air suction unit that operates to suck air from the inner surface of the spatter cover while the spatter cover is inserted into the brush.

[0026] In addition, the laser head unit further includes a nozzle module that receives gas from a separate gas supply unit and sprays gas so that gas can be sprayed along the direction of travel of the laser beam during the process of irradiating the laser beam to the marking target, and at least one of the gas supply unit and the air suction unit can be controlled to operate by a separate control unit while the brush is rotated by the rotation driving unit while the spatter cover is inserted into the brush.

[0027] According to the present invention, by mounting a spatter cover on a laser head unit, it is possible to block the laser beam from being diffused and reflected externally during a laser marking operation, and at the same time, to block spatter from being scattered externally from the processing surface of a marking target, thereby ensuring the safety of workers without installing a separate shielding house, improving the efficiency of the work space, and preventing pollution of the surrounding environment.

[0028] In addition, by allowing the spatter cover to be cleaned through a separate cover cleaning unit, the service life of the spatter cover can be extended, and the weight of the spatter cover can be prevented from increasing, thereby maintaining a more stable operating state.

[0029] FIG. 1 is a conceptual diagram conceptually illustrating the configuration of a laser marking device according to one embodiment of the present invention.

[0030] FIG. 2 is a perspective view schematically illustrating the shape of a spatter cover of a laser marking device according to one embodiment of the present invention.

[0031] FIG. 3 is a drawing illustrating a structure for blocking the scattering of spatters using a laser marking device according to one embodiment of the present invention.

[0032] FIG. 4 is a schematic drawing showing a structure in which a blocking curtain is mounted on a laser marking device according to one embodiment of the present invention.

[0033] FIG. 5 is a perspective view schematically illustrating the shape of a blocking curtain of a laser marking device according to one embodiment of the present invention.

[0034] FIG. 6 is a conceptual diagram conceptually illustrating the configuration of a cover cleaning unit of a laser marking device according to one embodiment of the present invention.

[0035] FIG. 7 is a drawing illustrating a process of cleaning a spatter cover through a cover cleaning unit of a laser marking device according to one embodiment of the present invention.

[0036] FIG. 8 is a functional block diagram illustrating a control-related configuration of a laser marking device according to one embodiment of the present invention, functionally classified.

[0037]

[0038] Hereinafter, specific embodiments for implementing the present invention will be described in detail with reference to the drawings.

[0039] First, when assigning reference numbers to components in each drawing, it should be noted that identical components are assigned identical numbers whenever possible, even if they appear on different drawings. Furthermore, when describing the present invention, if a detailed description of a related known configuration or function is deemed likely to obscure the gist of the present invention, such detailed description will be omitted.

[0040] Additionally, when it is said that a component is 'connected', 'supported', 'connected', 'supplied', 'transmitted' or 'in contact with' another component, it should be understood that it may be directly connected, supported, connected, supplied, transmitted or in contact with that other component, but there may also be other components present in between.

[0041] The terminology used herein is intended solely to describe specific embodiments and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly dictates otherwise.

[0042] Additionally, please note that the terms "upper side," "lower side," and "side" in this specification are based on the illustrations in the drawings and may be expressed differently if the orientation of the subject changes. For the same reason, some components in the attached drawings are exaggerated, omitted, or schematically depicted, and the sizes of each component do not fully reflect the actual size.

[0043] Additionally, terms that include ordinal numbers, such as "first," "second," etc., may be used to describe various components, but these components are not limited by such terms. These terms are used solely to distinguish one component from another.

[0044] The term "comprising" as used in the specification means specifying a particular characteristic, region, integer, step, operation, element and / or component, but does not exclude the presence or addition of other particular characteristics, regions, integers, steps, operations, elements, components and / or groups.

[0045]

[0046] FIG. 1 is a conceptual diagram conceptually illustrating the configuration of a laser marking device according to one embodiment of the present invention, FIG. 2 is a perspective view schematically illustrating the shape of a spatter cover of a laser marking device according to one embodiment of the present invention, FIG. 3 is a diagram illustrating a structure for blocking the scattering of spatters through a laser marking device according to one embodiment of the present invention, FIG. 4 is a diagram schematically illustrating a structure in which a blocking curtain is mounted in a laser marking device according to one embodiment of the present invention, and FIG. 5 is a perspective view schematically illustrating the shape of a blocking curtain of a laser marking device according to one embodiment of the present invention.

[0047] A laser marking device according to one embodiment of the present invention is a device for imprinting a mark on a marking target (MP), and is configured to include a laser head unit (10) that irradiates a laser beam (LB), and a spatter cover (20) that can block diffuse reflection of the laser beam and scattering of spatter.

[0048] The laser head unit (10) includes a laser head (100) that irradiates a laser beam toward a marking target (MP) to imprint a mark on the surface of the marking target (MP). A nozzle module (200) capable of injecting gas toward the irradiation location of the laser beam may be coupled to the end of the laser head (100).

[0049] The laser head (100) moves in three directions by a transport unit (not shown) and moves the irradiation position of the laser beam to imprint a mark on the marking target (MP). A separate gas supply unit (40) is connected to the nozzle module (200) so that gas is supplied, and gas is sprayed from the nozzle module (200) by the gas supplied from the gas supply unit (40).

[0050] This laser head unit (10) is provided with a laser case (300) that surrounds the external space of the laser head (100) so that the laser head (100) can move in the internal space via the transfer unit. The transfer unit is provided in the internal space of the laser case (300) so that the laser head (100) can move in three-axis directions. The laser head (100) can be configured to be coupled to a separate transfer table (110) and move horizontally together with the transfer table (110) and move vertically on the transfer table (110).

[0051] In addition, the laser case (300) is mounted on a separate robot arm (not shown) and can be moved to a specific workspace by the robot arm. That is, the laser head unit (10) is moved to a specific workspace by the robot arm, and then moved in the X-axis, Y-axis, and Z-axis directions by the transport unit in the workspace to perform marking work on the processing surface of the marking target (MP).

[0052] The laser head (100) is a device that irradiates a laser beam toward a marking object (MP) to engrave a mark on the marking object (MP). It receives a laser beam generated from a separate laser generator (not shown), focuses it at an accurate irradiation location, and irradiates the laser beam. Various specifications can be applied to this laser head (100) depending on the usage conditions, such as the power of the laser beam, the focus position, and the diameter of the beam.

[0053] The nozzle module (200) is coupled to one side of the laser head (100) so that the laser beam passes through it and is formed to inject gas supplied from the gas supply unit (40). The gas injected through the nozzle module (200) is injected toward the irradiation location of the laser beam along the direction of travel of the laser beam, and by removing spatter (SP) through this gas injection, spatter (SP) is prevented from being attached to the processing surface of the marking target (MP). In this way, by preventing spatter (SP) from being attached to the processing surface of the marking target (MP), the clarity of the mark engraved on the marking target (MP) is improved.

[0054] As illustrated in Fig. 3, when a laser beam (LB) is irradiated onto the processing surface of a marking target (MP), a dot (DT) having a concave shape is formed on the processing surface due to local melting of the material. These dots (DT) are formed adjacent to each other continuously to form a single mark. At this time, spatter (SP) is generated in the dot (DT) area due to the melting of the material, and the spatter (SP) can be removed by spraying gas onto the corresponding dot (DT) area by the nozzle module (200). The gas flow sprayed through the nozzle module (200) is illustrated by a dotted line in the enlarged view of Fig. 3.

[0055] In this way, during the laser marking process, spatter (SP) is removed from the processing surface by gas injection and may scatter to the surroundings. In one embodiment of the present invention, a spatter cover (20) is provided to prevent spatter (SP) from scattering to the surroundings and to prevent the laser beam from being diffused and reflected to the outside.

[0056] The spatter cover (20) is coupled to the lower end of the laser head unit (10) in the direction toward the marking target (MP), and is formed to surround the outer perimeter of the point where the laser beam (LB) is irradiated while the laser beam (LB) is irradiated to the marking target (MP), thereby blocking the point from the outside.

[0057] More specifically, the spatter cover (20) may be formed in a hollow cylindrical shape with an open bottom surface adjacent to the marking target (MP), and may be coupled to the bottom of the transfer table (110) of the laser head unit (10) so as to move horizontally together with the laser head unit (10). Although not shown, a plurality of cut portions (not shown) may be formed at the bottom of the spatter cover (20). The cut portions may be formed in a partially cut shape along the axial direction of the spatter cover (20), and a plurality of cut portions may be formed spaced apart from each other along the circumferential direction. By forming the cut portions at the bottom of the spatter cover (20) in this way, even if the spatter cover (20) comes into contact with the processing surface of the marking target (MP), the impact may be cushioned by the elastic deformation of the cut portions, thereby preventing damage.

[0058] A head movement hole (310, 21) may be formed on the lower surface of the laser case (300) and the upper surface of the spatter cover (20) so that the laser head (100) can move up and down between the laser case (300) and the spatter cover (20).

[0059] For example, when the laser head unit (10) is not irradiating the laser beam (LB), the laser head unit (10) can move upward so as to be positioned in the internal space of the laser case (300) as shown in FIG. 1, and when the laser head unit (10) is irradiating the laser beam (LB) for marking work, the laser head unit (10) moves downward as shown in FIG. 3 and passes through the head movement hole (310, 21) so that its end can be positioned in the internal space of the spatter cover (20). The vertical movement of the laser head unit (10) is performed on the transfer table (110). That is, when the laser head unit (10) moves upward and downward, the transfer table (110) does not move upward and downward, and therefore, the spatter cover (20) is also maintained in a state of not moving upward and downward.

[0060] By mounting the spatter cover (20) in this way, spatter (SP) scattered from the dot (DT) area where the laser beam (LB) is irradiated to the surroundings is blocked from scattering by the spatter cover (20) and accumulates inside the spatter cover (20), as shown in the enlarged view of Fig. 3. Accordingly, contamination of the surrounding environment due to spatter scattering is prevented, and a clean and safe working environment can be maintained.

[0061] Meanwhile, the head movement hole (21) formed on the upper surface of the spatter cover (20) can be formed to come into contact with the outer surface of the laser head unit (10) when the laser head unit (10) moves downward, as shown in FIG. 3. In this way, by forming the head movement hole (21) of the spatter cover (20) to come into contact with the outer surface of the laser head unit (10), external scattering of spatter (SP) through the head movement hole (21) can be more completely blocked.

[0062] This spatter cover (20) can perform the function of blocking spatter (SP) from scattering around and simultaneously blocking laser beams from being diffused and reflected to the outside. For this purpose, the spatter cover (20) can be formed of an opaque material.

[0063] Meanwhile, a portion of the spatter (SP) may fly out of the spatter cover (20) through the gap between the processing surface of the marking target (MP) and the spatter cover (20), and as shown in FIG. 4, in one embodiment of the present invention, a separate blocking curtain (60) may be installed to block the spatter (SP) flying out of the spatter cover (20).

[0064] The blocking curtain (60) is attached to the lower outer surface according to the lower shape of the laser case (300), and is arranged in a form extending downward from the laser case (300), and its lower end can be formed to be in close contact with the processing surface of the marking target (MP). In addition, the blocking curtain (60) is formed in a form that surrounds the external space of the spatter cover (20), and the space blocked by the blocking curtain (60) can be maintained in a sealed state. The blocking curtain (60) can be formed to extend downward longer than the distance between the laser case (300) and the marking target (MP) so that it can be in close contact with the processing surface of the marking target (MP).

[0065] In addition, as illustrated in FIG. 5, the blocking curtain (60) may have a plurality of cut portions (62) formed at the lower end adjacent to the processing surface of the marking target (MP). The cut portions (62) are formed in a partially cut form along the axial direction of the blocking curtain (60), and a plurality of cut portions may be formed spaced apart along the circumferential direction.

[0066] In this way, by forming a plurality of cut portions (62) at the lower end of the blocking curtain (60), the lower end of the blocking curtain (60) can be smoothly brought into close contact with the processing surface of the marking target (MP). That is, in the process in which the blocking curtain (60) moves downward together with the laser case (300) and the lower end of the blocking curtain (60) comes into contact with the processing surface of the marking target (MP), the cut portions (62) of the blocking curtain (60) are elastically deformed, so that the mutual contact impact is buffered, and the lower end of the blocking curtain (60) can be brought into stable close contact with the processing surface of the marking target (MP).

[0067] In this way, by making the lower part of the blocking curtain (60) in close contact with the processing surface of the marking target (MP), spatter (SP) flying outward through the space between the blocking curtain (60) and the marking target (MP) can be more completely blocked.

[0068] According to the structure of the blocking curtain (60), the internal space of the blocking curtain (60) forms a sealed structure. A separate suction device (61) capable of sucking the internal space blocked by the blocking curtain (60) may be connected to one side of the blocking curtain (60). Through the operation of the suction device (61), spatter (SP) or foreign substances existing in the internal space of the blocking curtain (60) are sucked into the suction device (61). Accordingly, spatter (SP) flying to the outside of the spatter cover (20) is removed so that it does not exist on the processing surface of the marking target (MP), and in addition, spatter (SP) can be more completely prevented from flying into the surrounding working environment.

[0069]

[0070] FIG. 6 is a conceptual diagram conceptually illustrating the configuration of a cover cleaning unit of a laser marking device according to one embodiment of the present invention, FIG. 7 is a diagram illustrating a process of cleaning a spatter cover through a cover cleaning unit of a laser marking device according to one embodiment of the present invention, and FIG. 8 is a functional block diagram functionally classifying and illustrating a control-related configuration of a laser marking device according to one embodiment of the present invention.

[0071] A laser marking device according to one embodiment of the present invention may further include a cover cleaning unit (30) capable of removing spatter (SP) and foreign substances attached to the inner surface of a spatter cover (20) as shown in FIGS. 6 and 7.

[0072] The cover cleaning unit (30) may include a brush (400) that is formed to be insertable into the interior of the spatter cover (20) so that the outer surface thereof contacts the inner surface thereof, and a rotation driving unit (500) that rotates the brush (400) so that the outer surface thereof scrapes the inner surface thereof of the spatter cover (20).

[0073] In addition, the cover cleaning unit (30) may further include an air suction unit (600) that operates to suck air from the inner surface of the spatter cover (20) while the spatter cover (20) is inserted into the brush (400).

[0074] Looking more specifically, the brush (400) can be formed in a circular body shape, and a rotational shaft (410) mounted at the center can be rotatably coupled to a separate base body (401). The rotational driving unit (500) can rotate the brush (400) by rotating the rotational shaft (410), and can be configured with an electric motor, etc.

[0075] A separate air path (not shown) may be formed inside the body of the rotating shaft (410) and the brush (400), and the air suction unit (600) may be connected to the air path of the rotating shaft (410) through a connecting hose or the like to suction air. The vacuum pressure formed by the air suction unit (600) is transmitted to the inner surface of the spatter cover (20) through the internal air path of the rotating shaft (410) and the brush (400), and accordingly, air is sucked from the inner surface of the spatter cover (20), and in this process, spatter (SP) and foreign substances are sucked together.

[0076] Depending on the field to which the present invention is applied, instead of forming an air path inside the body of the rotating shaft (410) and the brush (400), a connecting hose may be formed that connects the air suction part (600) and the internal space of the cover cleaning unit (30) through the base body (401). Through this, air is sucked in from the inner surface of the spatter cover (20), and in this process, spatter (SP) and foreign substances may be sucked in together.

[0077] This cover cleaning unit (30) can be located in a separate work space, and as shown in (a) and (b) of FIG. 7, after the laser case (300) is moved into the cover cleaning unit (30) space by the robot arm, the spatter cover (20) can move downward so as to be inserted into the brush (400). When the spatter cover (20) is inserted into the brush (400) in this way, as shown in (b) of FIG. 7, the brush (400) can rotate to remove spatter (SP) and foreign substances accumulated on the inner surface of the spatter cover (20). In this process, by sucking air from the inner surface of the spatter cover (20) through the air suction unit (600), the removal of spatter (SP) and foreign substances can be performed more smoothly.

[0078] In order to facilitate air suction by the air suction unit (600) and to more completely prevent spatter (SP) from flying outward, a separate blocking case (420) is arranged on the outside of the brush (400). The blocking case (420) is formed in a hollow cylindrical shape to surround the external space of the brush (400) and can be coupled to the base body (401). As illustrated in FIG. 7, by arranging the blocking case (420) on the outside of the brush (400), air suction is made smoother and more stable, so that spatter (SP) attached to the spatter cover (20) can be more completely suctioned and removed, and in particular, spatter (SP) can be prevented from flying outward during the cleaning process.

[0079] Meanwhile, before the spatter cover (20) is inserted into the brush (400), it is preferable that the laser head (100) be controlled by the control unit (50) to move upward from the inner space of the spatter cover (20) to the inner space of the laser case (300) as shown in (a) and (b) of FIG. 7, so that the inner surface of the spatter cover (20) can be perfectly scraped by the brush (400) without interference with the laser head (100).

[0080] In addition, during the rotation process of the brush (400), air can be sucked from the inner surface of the spatter cover (20) through the air suction unit (600), and in addition, the operation can be controlled by the control unit (50) so that gas is sprayed through the gas supply unit (40) and nozzle module (200) of the laser head unit (10). The gas sprayed through the nozzle module (200) can be sprayed along the upper surface of the brush (400) toward the inner surface of the spatter cover (20), and through this gas spraying, spatters (SP) and foreign substances accumulated on the inner surface of the spatter cover (20) can be more easily removed.

[0081] The cleaning operation of the spatter cover (20) through the cover cleaning unit (30) can be controlled to be performed at regular intervals, thereby extending the service life of the spatter cover (20) and preventing the spatter cover (20) from malfunctioning or being damaged due to an increase in weight caused by spatter attachment.

[0082]

[0083] The above description is merely an illustrative illustration of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims

1. A laser head unit including a laser head that irradiates a laser beam toward a marking target to engrave a mark on the surface of the marking target; and A spatter cover coupled to the lower end of the laser head unit in the direction toward the marking target, and formed to surround the outer perimeter of the point where the laser beam is irradiated while the laser beam is irradiated to the marking target and block the point from the outside. A laser marking device including:

2. In paragraph 1, The above spatter cover is a laser marking device formed in a hollow column shape with an open lower surface adjacent to the marking target.

3. In paragraph 1, A laser case is provided that surrounds the outer space of the laser head unit so that the laser head unit can move in the inner space, The above spatter cover is a laser marking device that is coupled to the lower part of the laser head unit and moves together with the laser head unit.

4. In paragraph 2, A laser marking device having a blocking curtain mounted on the lower part of the laser case, the blocking curtain extending downward to cover the outer space of the spatter cover and contact the processing surface of the marking target.

5. In paragraph 4, A laser marking device having a separate suction device connected to one side of the above-mentioned blocking curtain, which can suck up the internal space of the above-mentioned blocking curtain.

6. In paragraph 4, A laser marking device in which a plurality of cutouts are formed on the lower part of the spatter cover adjacent to the surface of the marking target.

7. In paragraph 6, A laser marking device in which the above-mentioned cut portion is formed in a partially cut shape along the axial direction of the above-mentioned sputter cover and is formed in multiple numbers spaced apart along the circumferential direction.

8. In paragraph 1, The above laser marking device A laser marking device further comprising a cover cleaning unit capable of removing spatter and foreign substances attached to the inner surface of the spatter cover.

9. In paragraph 8, The above cover cleaning unit A brush formed so as to be insertable into the interior of the spatter cover so that the outer surface thereof contacts the inner surface of the spatter cover; and A rotating driving unit that rotates the brush so that the outer surface of the brush scrapes the inner surface of the spatter cover. A laser marking device including:

10. In paragraph 9, The above cover cleaning unit An air suction unit that operates to suck air from the inner surface of the spatter cover while the spatter cover is inserted into the brush. A laser marking device further comprising:

11. In paragraph 10, The above laser head unit In the process of irradiating the laser beam onto the marking target, the nozzle module further includes a nozzle module that supplies gas from a separate gas supply unit and sprays gas so that the gas can be sprayed along the direction of travel of the laser beam. A laser marking device in which at least one of the gas supply unit and the air suction unit is controlled by a separate control unit to operate while the brush is rotated by the rotation driving unit while the spatter cover is inserted into the brush.

Images