A surface roughening device for laser plate making of metal plates

Abstract

This utility model discloses a surface roughening treatment device for metal plate laser plate making, relating to the field of laser plate making technology. It includes a metal plate placement box, with positioning and adjustment mechanisms on both the front and rear sides of the top of the box. A cooling mechanism is provided inside the box, and a laser driving mechanism is located above it. Through-hole adjustment slots are provided on both the front and rear sides of the top of the box. This utility model adapts to gravure printing rollers of different diameters through the vertical adjustment of the lifting frame, and the telescopic box is driven horizontally by a first electric push rod to accommodate rollers of different lengths. A servo motor drives an active rotating rod to rotate the roller, achieving all-around roughening. This allows for stable clamping and driving of gravure printing rollers of various sizes, solving the problem of poor compatibility with large roller printing plates. Simultaneously, rotational processing improves the uniformity of roughening.

Description

Technical Field

[0001] This utility model relates to the field of laser plate making technology, specifically to a surface roughening treatment device for laser plate making of metal plates. Background Technology

[0002] In the printing industry, surface roughening of metal printing plates such as gravure rollers and CTP (Continuous Printing to Photonics) plates is a crucial pretreatment step to improve ink adhesion, dot reproduction accuracy, and plate lifespan. Traditional roughening processes mainly rely on techniques such as sandblasting, chemical etching, or anodizing, which have inherent drawbacks such as significant environmental pollution, poor process controllability, difficulty in ensuring uniformity, and limited ability to depict fine structures. With the deep application of laser technology in plate making, laser-directed plate making has become the mainstream direction for high-end printing plate manufacturing due to its advantages such as non-contact operation, high precision, digital control, and environmental friendliness. In the laser plate making process, laser surface roughening is a pre-process or accompanying step in plate making, and its quality directly affects the stability of the dot structure and printability of the subsequent laser engraving / ablation. The following problems exist with existing technologies:

[0003] Because general-purpose laser processing equipment is not designed for the roughening needs of metal printing plates, its optical path system, scanning galvanometer, cooling module, etc. are difficult to adapt to the high-speed and uniform roughening requirements of large-area metal plates, especially large roller metal printing plates such as gravure printing rollers, resulting in low roughening efficiency and poor applicability. Utility Model Content

[0004] This invention provides a surface roughening treatment device for laser plate making of metal plates to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0006] A surface roughening device for laser-made metal plates includes a metal plate placement box. Positioning and adjusting mechanisms are provided on both the front and rear sides of the top of the metal plate placement box. A cooling mechanism is provided inside the metal plate placement box. A laser driving mechanism is located above the metal plate placement box. A through-type adjusting groove is provided on both the front and rear sides of the top of the metal plate placement box. Lifting grooves penetrating the top of each adjusting groove are provided on both the left and right sides of the inner wall of the adjusting groove. Two connecting holes penetrating into the inner cavity of the lifting grooves are respectively provided on the front and rear sides of the metal plate placement box. The inner ring of the connecting hole is provided with a bolt. Both of the positioning and adjusting mechanisms include a lifting frame. Positioning side plates are fixedly installed on the left and right sides of the two lifting frames. The positioning side plates on both sides of the two lifting frames are slidably connected to the two lifting slots opened in the two adjusting slots. A number of threaded holes are evenly opened on the side of the positioning side plate near the connecting hole. The bolt is threadedly connected to one of the several threaded holes. A telescopic box is slidably installed on the inner ring of the lifting frame. A vertical plate is fixedly installed on the top of the lifting frame. A first electric push rod is fixedly installed on the side of the vertical plate near the threaded hole.

[0007] A further improvement of this utility model is that: each of the two telescopic boxes has a gravure printing roller shaft slot that passes through its top on its opposite surface; a driven rotating rod is movably installed on the opposite inner wall of the two gravure printing roller shaft slots; a servo motor is fixedly installed in the inner cavity of the telescopic box; the output shaft of the servo motor passes through the inner cavity of the gravure printing roller shaft slot and is fixedly installed with an active rotating rod; the active rotating rod and the clamping rubber pad are distributed left and right.

[0008] A further improvement of this utility model is that clamping rubber pads are fixedly bonded to the opposite surfaces of the two telescopic boxes.

[0009] A further improvement of this utility model is that: a pull-out groove penetrating its inner cavity is provided on the left side of the metal printing plate placement box, and a debris collection drawer is slidably installed in the inner cavity of the metal printing plate placement box, with the left end of the debris collection drawer engaging with the inner side of the pull-out groove.

[0010] A further improvement of the present invention is that the cooling mechanism includes two S-shaped cooling pipes, one on the left and one on the right. The front input end and the rear output end of the two S-shaped cooling pipes respectively pass through the front and rear ends of the metal printing plate placement box and are fixedly connected to a U-shaped central pipe. A coolant input pipe is fixedly connected to the front side of the front U-shaped central pipe, and a coolant output pipe is fixedly connected to the rear side of the rear U-shaped central pipe. A rotating drum is movably installed on the outer wall of the two S-shaped cooling pipes that are parallel and close to each other.

[0011] A further improvement of this utility model is that: an electric slide rail is fixedly installed on the left side of the metal printing plate placement box, and a slide rail is fixedly installed on the right side of the metal printing plate placement box; the laser driving mechanism includes a portal frame; a slider is fixedly installed at the bottom of each of the two vertical sections of the portal frame; the slider on the left side is connected to the electric slide rail for transmission, and the slider on the right side is slidably connected to the slide rail; a second electric push rod is fixedly installed at the top of the horizontal section of the portal frame; the output end of the second electric push rod extends through to the bottom of the horizontal section of the portal frame and is fixedly installed with a lifting box; a limiting slide rod is fixedly installed at the top of the lifting box, and the limiting slide rod is slidably connected to the horizontal section of the portal frame.

[0012] A further improvement of this utility model is that: a reciprocating slide groove is provided at the bottom of the lifting box, a servo motor II is fixedly installed on the left side of the inner wall of the reciprocating slide groove, a reciprocating lead screw is fixedly installed on the output shaft of the servo motor II, a slider is connected to the outer wall of the reciprocating lead screw, and a laser beam emitter is fixedly installed at the bottom of the slider.

[0013] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0014] 1. This utility model provides a surface roughening treatment device for metal plate laser plate making. The vertical adjustment of the lifting frame adapts to gravure printing rollers of different diameters, and the telescopic box is driven to extend and retract horizontally by the first electric push rod, which is compatible with rollers of different lengths. The servo motor drives the active rotating rod to rotate the roller, realizing all-round roughening. Thus, it can stably clamp and drive gravure printing rollers of various sizes, solving the problem of poor compatibility of large roller printing plates. At the same time, the uniformity of roughening is improved by rotation processing.

[0015] 2. This utility model provides a surface roughening treatment device for metal plate laser printing. The device achieves dynamic cooling by having coolant flow through an S-shaped cooling pipe and a rotating drum, directly contacting the bottom of the printing plate. The cooling system prevents thermal deformation of the printing plate, ensures the accuracy of laser roughening, and can accommodate two different types of metal printing plates: gravure printing rollers and CTP printing plates, thus improving applicability. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This is a schematic diagram of the positioning and adjustment mechanism of the present invention.

[0018] Figure 3 This is a schematic diagram of the telescopic box structure of this utility model;

[0019] Figure 4 This is a schematic diagram of the cooling mechanism of the present invention.

[0020] Figure 5 This is a schematic diagram of the laser driving mechanism of the present invention.

[0021] Figure 6 This is a bottom view of the lifting box structure of this utility model.

[0022] In the diagram: 1. Metal printing plate placement box; 11. Adjustment slot; 111. Lifting slot; 112. Docking hole; 113. Bolt; 12. Pull-out slot; 13. Debris collection drawer; 14. Electric slide rail; 2. Positioning adjustment mechanism; 21. Lifting frame; 22. Positioning side plate; 23. Threaded hole; 24. Telescopic box; 241. Gravure printing plate roller shaft slot; 242. Servo motor one; 243. Active rotating rod; 244. Driven rotating rod; 245. Clamping rubber pad; 25 1. Vertical plate; 26. First electric push rod; 3. Cooling mechanism; 31. S-shaped cooling pipe; 32. U-shaped central pipe; 33. Coolant inlet pipe; 34. Coolant outlet pipe; 35. Rotary drum; 4. Laser drive mechanism; 41. Portal frame; 42. Slider one; 43. Second electric push rod; 44. Lifting box; 441. Reciprocating slide rail; 442. Servo motor two; 443. Reciprocating lead screw; 444. Slider; 445. Laser beam emitter; 45. Limiting slide rod. Detailed Implementation

[0023] To make the technical means, creative features, objectives and effects of this utility model easier to understand

[0024] Understood. The present invention will now be further described in conjunction with specific implementation methods.

[0025] like Figure 1 , Figure 2 , Figure 3As shown, this utility model provides a surface roughening treatment device for metal plate laser plate making, including a metal plate placement box 1. Positioning adjustment mechanisms 2 are provided on both the front and rear sides of the top of the metal plate placement box 1. A cooling mechanism 3 is provided inside the metal plate placement box 1. A laser driving mechanism 4 is provided above the metal plate placement box 1. Adjustment grooves 11 extending through the front and rear are provided on both the front and rear sides of the top of the metal plate placement box 1. Lifting grooves 111 extending through the top are provided on both the left and right sides of the inner wall of the adjustment grooves 11. Two connecting holes 112 extending into the inner cavity of the lifting grooves 111 are respectively provided on the front and rear sides of the metal plate placement box 1. Bolts 113 are provided on the inner ring of the connecting holes 112. Each of the two positioning adjustment mechanisms 2 includes a lifting frame 21. Positioning side plates 22 are fixedly installed on both the left and right sides of the two lifting frames 21. The positioning side plates 22 on both sides of the two lifting frames 21 respectively connect with the two lifting grooves opened in the two adjustment grooves 11. 111 is slidably connected, and the positioning side plate 22 is evenly provided with a number of threaded holes 23 on the side near the docking hole 112. The bolt 113 is threadedly connected to one of the threaded holes 23. The inner ring of the lifting frame 21 is slidably installed with a telescopic box 24. The top of the lifting frame 21 is fixedly installed with a vertical plate 25. The side of the vertical plate 25 near the threaded hole 23 is fixedly installed with a first electric push rod 26. The opposite surfaces of the two telescopic boxes 24 are provided with gravure printing roller shaft slots 241 that pass through their tops. The inner walls of the two gravure printing roller shaft slots 241 are movably installed with driven rotating rods 244. The inner cavity of the telescopic box 24 is fixedly installed with a servo motor 242. The output shaft of the servo motor 242 passes through the inner cavity of the gravure printing roller shaft slot 241 and is fixedly installed with an active rotating rod 243. The active rotating rod 243 and the clamping rubber pad 245 are distributed on the left and right. The opposite surfaces of the two telescopic boxes 24 are fixedly bonded with clamping rubber pads 245.

[0026] When surface roughening of the gravure printing roller is required, the two end shafts of the gravure printing roller can be inserted into the two gravure printing roller shaft slots 241 and placed on the active rotating rod 243 and the driven rotating rod 244. The contact between the arc surfaces maintains the stability of the placement. At the same time, the active rotating rod 243 can be rotated by starting the servo motor 242, thereby driving the gravure printing roller to rotate, which facilitates the laser to perform all-round surface roughening treatment. At the same time, when the length of the gravure printing roller is different, the drive plate on the top of the telescopic box 24 can be moved towards the inner cavity of the metal printing plate placement box 1 by starting the first electric push rod 26, and the telescopic box 24 can be moved towards the inner cavity of the metal printing plate placement box 1. The drive plate at the top of the shrink box 24 maintains stability of movement through the sliding connection between the slide rod and the upright plate 25, thus ultimately adapting to gravure printing rollers of different lengths. When the gravure printing rollers are of different thicknesses, the heights of the shafts at both ends are also different. In this case, the lifting frame 21 in the inner cavity of the two adjusting grooves 11 is adjusted up and down by sliding the positioning side plate 22 to the lifting groove 111, and one of the several threaded holes 23 corresponding to the height is aligned with the docking hole 112. The height of the entire lifting frame 21 is fixed by passing the bolt 113 through the docking hole 112 and threading it. This makes it easy to adapt to gravure printing rollers of different thicknesses.

[0027] like Figure 4 As shown, a pull-out groove 12 penetrating the inner cavity is provided on the left side of the metal printing plate placement box 1. A debris collection drawer 13 is slidably installed in the inner cavity of the metal printing plate placement box 1. The left end of the debris collection drawer 13 is engaged with the inner side of the pull-out groove 12. The cooling mechanism 3 includes two S-shaped cooling pipes 31 on the left and right. The front input end and the rear output end of the two S-shaped cooling pipes 31 pass through the front and rear ends of the metal printing plate placement box 1 respectively and are fixedly connected to a U-shaped central pipe 32. A coolant input pipe 33 is fixedly connected to the front side of the front U-shaped central pipe 32, and a coolant output pipe 34 is fixedly connected to the rear side of the rear U-shaped central pipe 32. A rotating drum 35 is movably installed on the outer wall of the two S-shaped cooling pipes 31 that are parallel and close to each other.

[0028] When placing the gravure printing roller, it can be stabilized on the rotating drum 35 between the opposite faces of the two S-shaped cooling pipes 31. The movable connection between the rotating drum 35 and the S-shaped cooling pipes 31 ensures that the rotation of the gravure printing roller is not hindered. Simultaneously, coolant can enter the inner cavity of the U-shaped central pipe 32 from the coolant inlet pipe 33, and then enter the inner cavity of the S-shaped cooling pipes 31. The metal heat-conducting materials of the S-shaped cooling pipes 31 and the rotating drum 35 effectively cool the gravure printing roller during surface roughening treatment. The coolant passes through the S-shaped cooling pipes... After tube 31, the coolant can be discharged from the coolant output tube 34 and recycled. The flat printing CTP plate base can be placed directly on the two S-shaped cooling tubes 31, and with the relative movement of the two telescopic boxes 24, it is finally clamped and positioned by the clamping rubber pad 245. The debris generated during the laser surface roughening process can fall through the gap between the two S-shaped cooling tubes 31 and finally fall into the inner cavity of the debris collection drawer 13. The debris collection drawer 13 can be pulled out through the pull slot 12 periodically to clean the debris.

[0029] like Figure 5 , Figure 6 As shown, an electric slide rail 14 is fixedly installed on the left side of the metal printing plate placement box 1, and a slide rail is fixedly installed on the right side of the metal printing plate placement box 1. The laser drive mechanism 4 includes a gantry frame 41. Slider 42 is fixedly installed at the bottom of the two vertical positions of the gantry frame 41. The left slider 42 is connected to the electric slide rail 14 for transmission, and the right slider 42 is slidably connected to the slide rail. A second electric push rod 43 is fixedly installed at the top of the horizontal position of the gantry frame 41. The output end of the second electric push rod 43 extends through to the horizontal position of the gantry frame 41. A lifting box 44 is fixedly installed at the bottom, and a limit slide rod 45 is fixedly installed at the top of the lifting box 44. The limit slide rod 45 is slidably connected to the horizontal position of the gantry frame 41. A reciprocating slide groove 441 is opened at the bottom of the lifting box 44. A servo motor 442 is fixedly installed on the left side of the inner wall of the reciprocating slide groove 441. A reciprocating screw 443 is fixedly installed on the output shaft of the servo motor 442. A slider 444 is connected to the outer wall of the reciprocating screw 443. A laser beam emitter 445 is fixedly installed at the bottom of the slider 444.

[0030] During surface roughening, the overall gantry frame 41 can be moved back and forth by the electric slide rail 14 to adjust its position. At the same time, the overall lifting box 44 can be driven by the second electric push rod 43 to descend stably by the sliding connection between the limit slide rod 45 and the gantry frame 41, so that the laser beam emitted by the laser beam emitter 445 contacts the surface of the gravure printing roller or the CTP plate base. When processing the gravure printing roller, the slider 444 can be controlled by the rotation speed of the second servo motor 442 to rotate the reciprocating screw 443, so that it stops at the center of the top of the gravure printing roller, and thus the surface roughening is carried out as the gravure printing roller slowly rotates. For the CTP plate base, the reciprocating screw 443 can be driven by the second servo motor 442 to rotate, thereby driving the slider 444 and the laser beam emitter 445 to move left and right. With the back and forth movement of the overall gantry frame 41, the surface roughening of the CTP plate base can be completed.

[0031] The working principle of this metal plate laser plate making surface roughening treatment device will be explained in detail below.

[0032] like Figure 1-6As shown, when surface roughening of the gravure printing roller is required, the two ends of the gravure printing roller can be inserted into the two gravure printing roller shaft slots 241 and placed on the active rotating rod 243 and the driven rotating rod 244. The contact between the arc surfaces maintains the stability of the placement. At the same time, the active rotating rod 243 can be rotated by starting the servo motor 242, thereby driving the gravure printing roller to rotate, which facilitates the laser to perform all-round surface roughening treatment. At the same time, when the length of the gravure printing roller is different, the drive plate at the top of the telescopic box 24 can be moved towards the inner cavity of the metal printing plate placement box 1 by starting the first electric push rod 26. The drive plate at the top of the telescopic box 24 maintains the stability of the movement by means of the sliding connection between the slide rod and the upright plate 25. Ultimately, it can adapt to gravure printing rollers of different lengths. When the thickness of the gravure printing roller is different, the height of the shaft at both ends is also different. At this time, it is only necessary to adjust the height of the lifting frame 21 in the inner cavity of the two adjusting grooves 11 by sliding the positioning side plate 22 to the lifting groove 111, and align one of the several threaded holes 23 at the corresponding height with the docking hole 112. The height of the entire lifting frame 21 is fixed by threading the bolt 113 through the docking hole 112. This makes it easy to adapt to gravure printing rollers of different thicknesses. When the gravure printing roller is placed, it can be placed on the rotating drum 35 between the opposite faces of the two S-shaped cooling pipes 31 to maintain stability. The movable connection between the rotating drum 35 and the S-shaped cooling pipes 31 does not hinder the rotation of the gravure printing roller. Coolant can enter the inner cavity of the U-shaped concentrator 32 from the coolant inlet pipe 33, and then enter the inner cavity of the S-shaped cooling pipe 31. The metal heat-conducting material of the S-shaped cooling pipe 31 and the rotating drum 35 can be used to cool the gravure printing roller during surface roughening treatment. After passing through the S-shaped cooling pipe 31, the coolant can be discharged from the coolant outlet pipe 34 for recycling. The CTP printing plate base can be placed directly on the two S-shaped cooling pipes 31, and with the relative movement of the two telescopic boxes 24, it is finally clamped and positioned by the clamping rubber pad 245. The debris generated during laser surface roughening treatment can fall through the gap between the two S-shaped cooling pipes 31 and finally fall into the inner cavity of the debris collection drawer 13. The debris collection drawer 13 can be periodically emptied through the pull-out groove 1. 2. Once pulled out, debris can be cleaned. During processing, the overall gantry frame 41 can be moved back and forth via the electric slide rail 14 to adjust its position. Simultaneously, the overall lifting box 44 can be driven by activating the second electric push rod 43, which uses the limit slide rod 45 to slide and connect with the gantry frame 41 to descend stably. This allows the laser beam emitted by the laser beam emitter 445 to contact the surface of the gravure printing roller or the CTP plate base. When processing the gravure printing roller, the slider 444 can be controlled by the rotation speed of the second servo motor 442 to rotate the reciprocating screw 443, keeping it at the center of the top of the gravure printing roller. As the gravure printing roller slowly rotates, surface roughening is performed. For the CTP plate base, the reciprocating screw 443 can be rotated by continuously activating the second servo motor 442.This drives the slider 444 and the laser beam emitter 445 to move left and right, and in conjunction with the forward and backward movement of the overall gantry frame 41, completes the all-around roughening treatment of the CTP plate base surface.

[0033] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A metal plate laser engraving surface roughening processing device, comprising a metal printing plate placing box (1), characterized in that: The metal printing plate placement box (1) is provided with positioning adjustment mechanisms (2) on both the front and rear sides of the top. The metal printing plate placement box (1) is provided with a cooling mechanism (3) in its inner cavity. The metal printing plate placement box (1) is provided with a laser driving mechanism (4) on its top. The metal printing plate placement box (1) is provided with a front-to-back through adjustment groove (11) on both the front and rear sides of the top. The adjustment groove (11) is provided with a lifting groove (111) on both the left and right sides of its inner wall, which is connected to its top. The metal printing plate placement box (1) is provided with two docking holes (112) on the front and rear sides, which are connected to the inner cavity of the lifting groove (111). The inner ring of the docking hole (112) is provided with a bolt (113). The two positioning adjustment mechanisms (2) are both enclosed. The device includes a lifting frame (21), and positioning side plates (22) are fixedly installed on both the left and right sides of the two lifting frames (21). The positioning side plates (22) on both sides of the two lifting frames (21) are slidably connected to the two lifting slots (111) opened in the two adjustment slots (11). The positioning side plates (22) are evenly provided with a number of threaded holes (23) on the side near the docking hole (112). The bolt (113) is threadedly connected to one of the number of threaded holes (23). The inner ring of the lifting frame (21) is slidably installed with a telescopic box (24). The top of the lifting frame (21) is fixedly installed with a vertical plate (25). The side of the vertical plate (25) near the threaded hole (23) is fixedly installed with a first electric push rod (26).

2. The metal plate laser plate making surface roughening processing apparatus according to claim 1, characterized in that: The two telescopic boxes (24) are provided with gravure printing roller shaft slots (241) that pass through their tops on their opposite sides. Driven rotating rods (244) are movably installed on the opposite sides of the inner walls of the two gravure printing roller shaft slots (241). A servo motor (242) is fixedly installed in the inner cavity of the telescopic box (24). The output shaft of the servo motor (242) passes through the inner cavity of the gravure printing roller shaft slot (241) and is fixedly installed with an active rotating rod (243). The active rotating rod (243) and the clamping rubber pad (245) are distributed on the left and right.

3. The surface roughening treatment device for metal plate laser plate making according to claim 2, characterized in that: Clamping rubber pads (245) are fixedly bonded to the opposite surfaces of the two telescopic boxes (24).

4. The metal plate laser plate making surface roughening processing apparatus according to claim 1, characterized in that: The metal printing plate placement box (1) has a pull-out groove (12) that runs through its inner cavity on the left side. A debris collection drawer (13) is slidably installed in the inner cavity of the metal printing plate placement box (1). The left end of the debris collection drawer (13) is engaged with the inner side of the pull-out groove (12).

5. The metal plate laser plate making surface roughening processing apparatus according to claim 1, characterized in that: The cooling mechanism (3) includes two S-shaped cooling pipes (31) on the left and right. The front input end and the rear output end of the two S-shaped cooling pipes (31) respectively pass through the front and rear ends of the metal printing plate placement box (1) and are fixedly connected to a U-shaped central pipe (32). The front side of the front U-shaped central pipe (32) is fixedly connected to a coolant input pipe (33), and the rear side of the rear U-shaped central pipe (32) is fixedly connected to a coolant output pipe (34). A rotating drum (35) is movably installed on the outer wall of the two S-shaped cooling pipes (31) that are parallel and close to each other.

6. The metal plate laser plate making surface roughening processing apparatus according to claim 1, characterized in that: An electric slide rail (14) is fixedly installed on the left side of the metal printing plate placement box (1), and a slide rail is fixedly installed on the right side of the metal printing plate placement box (1). The laser driving mechanism (4) includes a gantry frame (41). A slider (42) is fixedly installed at the bottom of the two vertical positions of the gantry frame (41). The slider (42) on the left side is connected to the electric slide rail (14) in a transmission connection, and the slider (42) on the right side is slidably connected to the slide rail. A second electric push rod (43) is fixedly installed at the top of the horizontal position of the gantry frame (41). The output end of the second electric push rod (43) extends through to the bottom of the horizontal position of the gantry frame (41) and is fixedly installed with a lifting box (44). A limit slide rod (45) is fixedly installed at the top of the lifting box (44), and the limit slide rod (45) is slidably connected to the horizontal position of the gantry frame (41).

7. A metal plate laser plate surface roughening processing apparatus according to claim 6, characterized in that: The bottom of the lifting box (44) is provided with a reciprocating slide groove (441). A servo motor (442) is fixedly installed on the left side of the inner wall of the reciprocating slide groove (441). A reciprocating screw (443) is fixedly installed on the output shaft of the servo motor (442). A slider (444) is connected to the outer wall of the reciprocating screw (443). A laser beam emitter (445) is fixedly installed at the bottom of the slider (444).

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