A laser marking machine

Abstract

The invention discloses a laser marking machine, comprising a paper feeding mechanism, a laser printing mechanism, a limiting mechanism, an automatic tool and a control system. The paper feeding mechanism comprises a paper feeder and a label paper roll for conveying printing paper along a conveying path. The paper feeder comprises an upper paper pressing roller, a lower paper pressing roller and a paper feeding stepping motor. The label paper roll is formed by winding a long strip of paper. The paper feeder is arranged at the downstream of the paper feeding mechanism and is used to provide label paper to the printing mechanism. The laser printing mechanism is arranged at the downstream of the conveying direction of the paper feeding mechanism and is used to print information on the label paper. The automatic tool is arranged at the downstream of the laser printing mechanism and cuts the long strip of label paper into a specified length. The limiting mechanism comprises a label paper baffle, a label paper roll wide band adjuster and a limiting plate and is used to position the label paper. The control system is used to control the operation of the laser marking machine. The laser marking machine of the invention can realize continuous printing of labels of a custom length.

Description

Technical Field

[0001] The present invention relates to the technical field related to laser printing, and in particular to a laser marking machine. Background Art

[0002] Laser marking machines use laser beams to mark permanent marks on the surfaces of various materials. The effect of marking is to expose the deep material through the evaporation of the surface material, thereby engraving exquisite patterns, trademarks and texts. Laser marking machines are mainly divided into CO2 laser marking machines, semiconductor laser marking machines, fiber laser marking machines and YAG laser marking machines. At present, laser marking machines are mainly used in some occasions that require more precision and higher accuracy, but these marking machines cannot perform fault detection in automated production and require personnel on duty. For this reason, we propose a laser marking machine to solve the above problems. Summary of the invention

[0003] In response to the problems existing in the above-mentioned prior art, the present invention provides a laser marking machine, including a base, a control system and a paper feeding mechanism. The paper feeding mechanism feeds the label paper into a laser printing mechanism, and the laser printing mechanism prints printed information on the label paper. The printed label paper is fed into an automatic tool for processing by the paper feeding mechanism, and the automatic tool mechanism cuts the label paper into a receiving tray. The control system completes a workflow.

[0004] In order to achieve the above-mentioned purpose, the paper feeding mechanism adopted by the present invention includes a label paper roll, a label paper tension adjustment roller and a paper feeder for conveying printing paper along a conveying path; the label paper tension adjustment roller is pressed on the upper surface of the label paper by its own gravity, and the two ends of the label paper tension adjustment roller are movably connected to the perforated bracket, and the perforated bracket is installed on the base; the label paper roll cylinder is located upstream of the label paper tension adjustment roller, and a label paper roll rotation damping regulator is installed at one end of the label paper roll cylinder, and a label paper roll width regulator is installed at the other end. The label paper roll cylinder is installed with an inclined brace on one side of the label paper roll rotation damping regulator, and the bottom of the inclined brace is fixedly connected to the left end of the base.

[0005] As a further optimization of the above solution, an upper pressing roller and a lower pressing roller are arranged on the right side of the label paper tension adjustment roller, and the upper pressing roller and the lower pressing roller are parallel in the same plane and in close contact through the label paper.

[0006] As a further optimization of the above scheme, the limiting mechanism includes a label paper roll baffle and a limiting plate, and a label paper baffle is installed at each of the left and right ends between the label paper roll rotation damping adjuster and the label paper roll width adjuster, and the label paper roll width adjuster can adjust the distance between the two label paper baffles according to the width of the label paper; the limiting plate is divided into two sections, one section is located between the label paper tension adjustment roller and the upper paper pressing roller, and the other section is located between the upper paper pressing roller and the automatic tool, and the limiting plates are respectively arranged on the left and right sides of the movement path of the label paper, and the width between the left and right sides of the limiting plates is adjusted according to the width of the label paper, and a plurality of oblong holes are provided on the limiting plate, and the oblong holes correspond to the positioning screw holes on the base. When the limiting plate is adjusted to the position, bolts are used to pass through the oblong holes and screw into the positioning screw holes to fix the limiting plate and the base.

[0007] As a further optimization of the above scheme, the paper feeder includes an upper paper pressing roller, a lower paper pressing roller and a paper feeding stepper motor. The paper feeder is arranged downstream of the label paper tension adjustment roller. The upper paper pressing roller is horizontally placed above the label paper, and the lower paper pressing roller is horizontally placed below the label paper. The upper paper pressing roller and the lower paper pressing roller are parallel in the same plane and are in close contact with the label paper. The paper feeding stepper motor is arranged at the outer end of the lower paper pressing roller. The power output end of the paper feeding stepper motor drives the lower paper pressing roller to rotate clockwise, and the upper paper pressing roller is driven by the lower paper pressing roller to rotate counterclockwise. The label paper between the upper paper pressing roller and the lower paper pressing roller moves from left to right under the action of friction and enters the downstream laser printing mechanism.

[0008] As a further optimization of the above scheme, the laser printing mechanism includes a laser marking head focus adjustment lifting platform, a laser marking head and a rotating handle. The laser marking head focus adjustment lifting platform is installed on one side of the middle part of the base. Two oblong holes in the vertical direction are opened in the middle of the laser marking head focus adjustment lifting platform. The laser marking head is movably connected to the laser marking head focus adjustment lifting platform through the two oblong holes. The rotating handle is installed at the top center of the laser marking head focus adjustment lifting platform. After the rotating handle is rotated, the height of the laser marking head can be adjusted as needed.

[0009] As a further optimization of the above scheme, the automatic tool mechanism includes a paper cutter cylinder, a paper cutter and a paper cutter base plate. The automatic tool is located downstream of the laser printing mechanism. The automatic tool is installed on the right end of the base. A paper cutter cylinder is provided on one side of the top of the automatic tool. A paper cutter is vertically installed below the paper cutter cylinder. The two ends of the paper cutter are not on the same horizontal plane. A paper cutter base plate is vertically installed below the paper cutter. A penetrating label paper outlet is opened in the middle of the paper cutter base plate, and response holes are opened at both ends of the outlet.

[0010] As a further optimization of the above scheme, the left and right ends of the upper paper pressing roller are fixed on both sides of the movable frame, a bracket is suspended above the movable frame, and the supporting brackets on both sides of the bracket are installed on both sides of the middle part of the base. A through hole is provided in the center of the top of the bracket, and a pull rod is vertically installed in the center of the top of the movable frame. The pull rod passes through the through hole in the center of the top of the bracket, and an upper paper pressing roller pressing / lifting handle is installed on the top of the pull rod. A circle of spring is sleeved around the pull rod, and one end of the spring is connected to the center of the top of the movable bracket, and the other end is connected around the through hole at the top of the bracket.

[0011] As a further optimization of the above solution, a vacuum cleaner exhaust port is provided on the upper right side of the paper feeder.

[0012] As a further optimization of the above scheme, the control system includes a computer and a perception system, and the computer makes the next operation according to the information collected by the perception system. The perception system includes a paper shortage detection sensor, a paper arching sensor, an anti-misprinting sensor and a paper discharge detection sensor. The transmitting end of the paper shortage detection sensor is arranged above the upper pressure roller and the upper paper pressure roller, and the receiving end of the paper shortage detection sensor is located below the upper pressure roller and the upper paper pressure roller; the transmitting end of the paper arching sensor is located at the left end of one side of the limit plate on the right side of the upper paper pressure roller, and the receiving end of the paper arching sensor is located at the right end of the other side of the limit plate on the right side of the upper paper pressure roller. The planes where the transmitting end and the receiving end of the paper arching sensor are located are parallel to the standard and higher than the plane where the label paper is located; the transmitting end of the anti-misprinting sensor is located above the laser marking head and the paper cutter, and the receiving end of the anti-misprinting sensor is located below the laser marking head and the paper cutter; the transmitting end of the paper discharge detection sensor is located above the right side of the paper cutter, and the receiving end of the paper discharge detection sensor is located below the right side of the paper cutter.

[0013] A laser marking machine of the present invention has the following beneficial effects:

[0014] 1. A laser marking machine of the present invention, the control system can control the paper feeding mechanism, the laser printing mechanism and the automatic tool to continuously and custom print out label paper as needed.

[0015] 2. In a laser marking machine of the present invention, the paper feeding mechanism can stably feed the label paper into each actuator with the assistance of the limiting mechanism.

[0016] 3. In the laser marking machine of the present invention, the laser printing mechanism can manually adjust the distance between the laser marking head and the label paper under the control of the rotating handle, so that the laser can be focused on the label paper surface to improve the printing quality.

[0017] 4. In the laser marking machine of the present invention, the automatic tool mechanism is controlled by the control system to accurately cut the printed label paper.

[0018] 5. In a laser marking machine of the present invention, the upper paper pressing roller pressing down / lifting handle can conveniently lift the upper paper pressing roller, so that the label paper can conveniently pass through the upper paper pressing roller during the preparation for inserting the label paper. The spring can reset the upper paper pressing roller and the lower paper pressing roller to tightly squeeze the label paper. The squeezed label paper can have better flatness, which can improve the printing quality and reduce the failure rate at the same time.

[0019] 6. In a laser marking machine of the present invention, the vacuum cleaner exhaust port can be externally connected to an exhaust mechanism to make the laser printing area a dust-free area, thereby improving the laser printing quality.

[0020] 7. In the laser marking machine of the present invention, the sensing system can accurately determine the state of the label paper during the printing process. If the label paper is abnormal during the printing process, the control system can immediately terminate the laser printing work, thereby ensuring the safety of the production process and preventing losses caused by human negligence. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front schematic diagram of the present invention;

[0022] Figure 2 It is a spatial stereoscopic schematic diagram of the present invention;

[0023] Figure 3 It is a side schematic diagram of the present invention;

[0024] Figure 4 A bottom view of the present invention;

[0025] Figure 5 It is a top view of the present invention.

[0026] In the figure: 1 base, 2 diagonal support, 3 label paper roll width adjuster, 4 label paper baffle, 5 label paper tension adjustment roller, 6 hole bracket, 7 paper feeding stepping motor, 8 laser marking head focal length adjustment lifting platform, 9 label paper roll, 10 rotating handle, 11 limit plate, 12 laser marking head, 13 vacuum cleaner exhaust port, 14 paper cutter cylinder, 15 paper shortage detection sensor, 16 receiving tray, 17 upper pressure roller, 18 lower pressure roller, 19 upper pressure roller pressing / lifting handle, 20 bracket, 21 movable frame, 22 upper pressure roller, 23 paper arching sensor, 24 paper output detection sensor, 25 lower pressure roller, 26 paper cutter base, 27 anti-misprinting sensor, 28 paper cutter, 29 pull rod, 30 spring, 31 label paper roll rotation damping regulator. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0028] See also Figure 1-5 The present invention provides a technical solution: a laser marking machine, which includes a base 1, a control system and a paper feeding mechanism. The paper feeding mechanism feeds the label paper into a laser printing mechanism, and the laser printing mechanism prints printing information on the label paper. After printing, the label paper is fed into an automatic tool for processing by the paper feeding mechanism, and the automatic tool cuts the label paper and drops it into a receiving tray 16. The control system can control the paper feeding mechanism, the laser printing mechanism and the automatic tool to continuously and custom print out label paper as needed.

[0029] See also Figure 1-2 The paper feeding mechanism includes a label paper roll 9, a label paper tension adjustment roller 5 and a paper feeder for conveying printing paper along a conveying path; the label paper tension adjustment roller 5 is pressed on the upper surface of the label paper by its own gravity, and the two ends of the label paper tension adjustment roller 5 are movably connected to the perforated bracket 6, and the perforated bracket 6 is installed on the base 1; the label paper roll 9 is located upstream of the label paper tension adjustment roller 5, and a label paper roll rotation damping regulator 31 is installed at one end of the label paper roll 9, and a label paper roll width regulator 3 is installed at the other end. The label paper roll 9 is installed with an oblique support 2 on one side of the label paper roll rotation damping regulator 31, and the bottom of the oblique support 2 is fixedly connected to the left end of the base 1. The paper feeding mechanism can stably feed the label paper into the laser printing mechanism and the automatic tool mechanism.

[0030] See also Figure 1-2 An upper pressing roller 17 and a lower pressing roller 18 are arranged parallel to the right side of the label paper tension adjustment roller 5. The upper pressing roller 17 and the lower pressing roller 18 are parallel in the same plane and in close contact with the label paper. After the label paper is pulled out from the label paper roll 9, it is fed flatly into the paper feeder.

[0031] See also Figure 2The limiting mechanism provided includes a label paper roll baffle 4 and a limiting plate 11. A label paper baffle 4 is installed at each of the left and right ends between the label paper roll rotation damping regulator 11 and the label paper roll width regulator 3. The label paper roll width regulator 3 can adjust the distance between the two label paper baffles 4 according to the width of the label paper; the limiting plate 11 is divided into two sections, one section is located between the label paper tension adjustment roller 5 and the upper paper pressing roller 22, and the other section is located between the upper paper pressing roller 22 and the automatic tool mechanism. The limiting plates 11 are respectively arranged on the left and right sides of the movement path of the label paper. The width between the left and right limiting plates 11 is adjusted according to the width of the label paper. A plurality of oblong holes are provided on the limiting plate 11, and the oblong holes correspond to the positioning screw holes on the base 1. When the limiting plate 11 is adjusted to a good position, a bolt is used to pass through the oblong hole and screw into the positioning screw hole to fix the limiting plate 11 and the base 1. The limiting mechanism can keep the label paper in the correct state throughout the entire processing flow, which not only ensures the printing success rate, but also reduces the failure rate.

[0032] See also Figure 1-2 The paper feeder includes an upper paper pressing roller 22, a lower paper pressing roller 25 and a paper feeding stepping motor 7. The paper feeder is arranged downstream of the label paper tension adjustment roller 5. The upper paper pressing roller 22 is horizontally arranged above the label paper, and the lower paper pressing roller 25 is horizontally arranged below the label paper. The upper paper pressing roller 22 and the lower paper pressing roller 25 are parallel in the same plane and are in close contact with the label paper. The paper feeding stepping motor 7 is arranged at the outer end of the lower paper pressing roller 25. The power output end of the paper feeding stepping motor 7 drives the lower paper pressing roller 25 to rotate clockwise, and the upper paper pressing roller 22 is driven by the lower paper pressing roller 25 to rotate counterclockwise. The label paper between the upper paper pressing roller 22 and the lower paper pressing roller 25 moves from left to right under the action of friction and enters the downstream laser printing mechanism. The paper feeder not only provides power for the movement of the label paper, but also controls the movement rhythm of the label paper, ensuring that the label paper can complete the laser printing and paper cutting actions before proceeding to the next step.

[0033] See also Figure 1 The laser printing mechanism includes a laser marking head focus adjustment lifting platform 8, a laser marking head 12 and a rotating handle 10. The laser marking head focus adjustment lifting platform 8 is installed on one side of the middle part of the base 1. Two oblong holes in the vertical direction are opened in the middle of the laser marking head focus adjustment lifting platform 8. The laser marking head 12 is movably connected to the laser marking head focus adjustment lifting platform 8 through the two oblong holes. The rotating handle 10 is installed in the top center of the laser marking head focus adjustment lifting platform 8. After the rotating handle 10 is rotated, the height of the laser marking head 12 can be adjusted as needed. Under the control of the rotating handle 10, the laser printing mechanism can manually adjust the distance between the laser marking head 12 and the label paper, so that the laser can be focused on the label paper surface to improve the printing quality.

[0034] See also Figure 3The automatic tool mechanism includes a paper cutter cylinder 14, a paper cutter 28 and a paper cutter base plate 26. The automatic tool is located downstream of the laser printing mechanism. The automatic tool mechanism is installed at the right end of the base 1. A paper cutter cylinder 14 is provided on one side of the top of the automatic tool mechanism. A paper cutter 28 is vertically installed below the paper cutter cylinder 14. The two ends of the paper cutter 28 are not on the same horizontal plane. A paper cutter base plate 26 is vertically installed below the paper cutter 28. A penetrating label paper outlet is provided in the middle of the paper cutter base plate 26. The stress relief holes provided at both ends of the label paper outlet can eliminate the processing stress at the outlet and increase the service life of the paper cutter base plate 26. After the label paper extends from the label paper outlet, the automatic tool mechanism is controlled by the control system to accurately cut the printed label paper and drop it into the receiving tray 16.

[0035] See also Figure 2-3 The left and right ends of the upper paper pressing roller 22 are fixed on both sides of the movable frame 21, and a bracket 20 is suspended above the movable frame 21. The supporting brackets on both sides of the bracket 20 are installed on both sides of the middle part of the base 1. A through hole is provided in the center of the top of the bracket 20, and a pull rod 29 is vertically installed in the center of the top of the movable frame 21. The pull rod 29 passes through the through hole in the center of the top of the bracket 20. An upper paper pressing roller pressing / lifting handle 19 is installed on the top of the pull rod 29. A circle of spring 30 is sleeved around the pull rod 29. One end of the spring 30 is connected to the center of the top of the movable bracket 21, and the other end is connected to the through hole around the top of the bracket 20. The upper paper pressing roller pressing / lifting handle 19 can easily lift the upper paper pressing roller 22. In the preparation work of putting in label paper, the label paper can be easily passed through the upper paper pressing roller 22. The spring 30 can reset the upper paper pressing roller 22 and the lower paper pressing roller 25 to tightly squeeze the label paper. The squeezed label paper can have better flatness, which can improve the printing quality and reduce the failure rate.

[0036] See also Figure 1-5 A vacuum cleaner exhaust port 13 is provided on the upper right side of the paper feeder. The vacuum cleaner exhaust port can be connected to an exhaust mechanism to form a dust-free area in the laser printing area, thereby improving the quality of laser printing.

[0037] The laser marking machine includes a control system including a computer and a perception system. The computer makes the next operation according to the information collected by the perception system. The perception system includes a paper shortage detection sensor 15, a paper arching sensor 23, an anti-misprinting sensor 27 and a paper output detection sensor 24. The transmitting end of the paper shortage detection sensor 15 is arranged above the upper pressure roller 17 and the upper paper pressure roller 22, and the receiving end of the paper shortage detection sensor 15 is located below the upper pressure roller 17 and the upper paper pressure roller 22; the transmitting end of the paper arching sensor 23 is located at the left end of one side of the limit plate 31 on the right side of the upper paper pressure roller 22, and the receiving end of the paper arching sensor 23 is located at the right end of the other side of the limit plate 31 on the right side of the upper paper pressure roller 22. The transmitting end and The plane where the receiving end is located is parallel to the standard and higher than the plane where the label paper is located; the transmitting end of the anti-misprinting sensor 27 is located above the laser marking head 12 and the paper cutter bottom plate 26, and the receiving end of the anti-misprinting sensor 27 is located below the laser marking head 12 and the paper cutter bottom plate 26; the transmitting end of the paper discharge detection sensor 24 is located above the right side of the paper cutter 28, and the receiving end of the paper discharge detection sensor 24 is located below the right side of the paper cutter 28. The computer improves the automation level of the laser marking machine. The sensing system can accurately judge the state of the label paper during the printing process. If the label paper is abnormal during the printing process, the control system can immediately terminate the laser printing work, thereby ensuring the safety of the production process and preventing losses caused by human negligence.

[0038] Working principle: before starting the laser marking machine, the staff needs to wind the label paper on the label paper roll 9. According to the width of the label paper, the label paper width adjuster 3 needs to be adjusted to make the distance between the label paper baffles 4 adapt to the width of the label paper so that the label paper cannot swing left and right. The staff pulls the lower end of the wound label paper out of the lower end of the label paper roll 9 and places it under the label paper tension adjustment roller 5. The label paper tension adjustment roller 5 is pressed on the surface of the label paper under the action of its own gravity. The staff continues to pass one end of the label paper through the contact point between the upper pressure roller 17 and the lower pressure roller 18. The staff lifts the upper pressure roller down / lifting handle 19 to lift the upper pressure roller 22, and then passes the label paper between the upper pressure roller 22 and the lower pressure roller 25. The gap is then drawn out of the label paper outlet of the paper cutter base 26, and finally the limit plate 11 is adjusted to prevent the label from shaking left and right. After the label paper is set correctly, the staff inputs the parameters into the computer, performs a test print first, rotates the rotating handle 10 according to the printing effect, and the laser marking head focal length adjustment lifting platform 8 is the same as the prior art, so it is not repeated here. The distance between the laser marking head 12 and the label paper is adjusted. After the adjustment is correct, the printing is officially started. Under the drive of the paper feeding stepper motor 7, the lower paper pressing roller 25 starts to rotate clockwise, and the upper paper pressing roller 22 rotates counterclockwise under the action of the friction force of the lower paper pressing roller 25. The label paper between the upper paper pressing roller 22 and the lower paper pressing roller 25 is driven by the friction force from the left to the right. The label paper roll 9 moves to the right, and the label paper on the label paper roll 9 is also subjected to the pulling force and starts to move from left to right. Under the action of the friction force generated by the label paper roll 9, the label paper roll 9 also rotates counterclockwise. The label paper roll rotation damping regulator 31 can make the label paper roll 9 rotate smoothly and stably, so that the label paper between the label paper roll 9 and the upper paper pressing roller 22 can be tightened, and the tightened label paper can be kept flat; according to the setting, the label paper stops moving every time it moves a certain distance, waiting for the printing work of the laser printing mechanism. The laser printing technology is the same as the prior art, so it will not be repeated. After printing is completed, the paper feeding stepping motor 7 drives the operation of the paper feeder again. After printing, the label paper continues to move and extends out from the outlet of the paper cutter base. The pre-set paper cutter cylinder 14 controls the paper cutter 28 to complete the cutting of the label paper, and the cut label paper falls into the receiving tray; if the labels are used up during the working process, the paper shortage detection sensor 15 detects the signal, and the laser marking machine stops working and waits for the staff to add label paper again; if the label paper between the upper paper pressing roller 22 and the paper cutter base 26 bulges and hinders the signal transmission of the paper arching sensor 23, the laser marking machine stops working and waits for the staff to flatten the label paper and then work again; if there is no label paper between the upper paper pressing roller 22 and the paper cutter base 26, the anti-misprinting sensor 27 detects the signal, and the laser marking head 12 stops working and waits for new label paper to arrive before restarting;If the paper output detection sensor 24 continuously detects a signal, the paper cutter cylinder 14 stops working. When label paper extends from the exit of the paper cutter base 26 and blocks the signal of the paper output detection sensor 24, the paper cutter cylinder 14 starts working. ;

[0039] It is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser marking machine, characterized in that: It includes: A base (1), a control system, a limit mechanism, label paper and a paper feeding mechanism, wherein the paper feeding mechanism feeds the label paper into a laser printing mechanism, the laser printing mechanism prints printed information on the label paper, the printed label paper is fed into an automatic tool mechanism by the paper feeding mechanism for processing, the automatic tool mechanism cuts the label paper and drops it into a receiving tray (16), and the control system completes a workflow; The paper feeding mechanism comprises a label paper roll (9), a label paper tension adjustment roller (5) and a paper feeder for conveying printing paper along a conveying path; the label paper tension adjustment roller (5) is pressed on the upper surface of the label paper by its own weight, and the two ends of the label paper tension adjustment roller (5) are movably connected to a perforated bracket (6), and the perforated bracket (6) is installed on a base (1); the label paper roll (9) is located upstream of the label paper tension adjustment roller (5), one end of the label paper roll (9) is installed with a label paper roll rotation damping regulator (31), and the other end is installed with a label paper roll width regulator (3), and the label paper roll (9) is installed with an inclined brace (2) on one side of the label paper roll rotation damping regulator (31), and the bottom of the inclined brace (2) is fixedly connected to the left end of the base (1); An upper pressing roller (17) and a lower pressing roller (18) are arranged in parallel on the right side of the label paper tension adjustment roller (5); the upper pressing roller (17) and the lower pressing roller (18) are parallel in the same plane and in close contact with each other through the label paper; The limiting mechanism comprises a label paper baffle (4) and a limiting plate (11). The label paper baffle (4) is installed at the left and right ends between the label paper roll rotation damping regulator (31) and the label paper roll width regulator (3). The label paper roll width regulator (3) can adjust the distance between the two label paper baffles (4) according to the width of the label paper. The limiting plate (11) is divided into two sections, one section is located between the label paper tension regulating roller (5) and the upper paper pressing roller (22), and the other section is located between the upper paper pressing roller (22) and the automatic tool mechanism. The limiting plates (11) are respectively arranged on the left and right sides of the movement path of the label paper. The width between the left and right sides of the limiting plates (11) is adjusted according to the width of the label paper. The limiting plates (11) are provided with a plurality of oblong holes, and the oblong holes correspond to the positioning screw holes on the base (1). When the limiting plates (11) are adjusted to a good position, bolts are used to pass through the oblong holes and screw into the positioning screw holes to fix the limiting plates (11) and the base (1).

2. A laser marking machine according to claim 1, wherein the paper feeder comprises an upper paper pressing roller (22), a lower paper pressing roller (25) and a paper feeding stepping motor (7), wherein the paper feeder is arranged downstream of the label paper tension adjustment roller (5), the upper paper pressing roller (22) is arranged horizontally above the label paper, and the lower paper pressing roller (25) is arranged horizontally below the label paper, the upper paper pressing roller (22) and the lower paper pressing roller (25) are parallel in the same plane and are in close contact with the label paper, the paper feeding stepping motor (7) is arranged at the outer end of the lower paper pressing roller (25), the power output end of the paper feeding stepping motor (7) drives the lower paper pressing roller (25) to rotate clockwise, and the upper paper pressing roller (22) is driven by the lower paper pressing roller (25) to rotate counterclockwise, and the label paper between the upper paper pressing roller (22) and the lower paper pressing roller (25) moves from left to right under the action of friction and enters the downstream laser printing mechanism.

3. A laser marking machine according to claim 1, characterized in that: The laser printing mechanism comprises a laser marking head focus adjustment lifting platform (8), a laser marking head (12) and a rotating handle (10). The laser marking head focus adjustment lifting platform (8) is mounted on one side of the middle of the base (1). Two oblong holes in the vertical direction are opened in the middle of the laser marking head focus adjustment lifting platform (8). The laser marking head (12) is movably connected to the laser marking head focus adjustment lifting platform (8) through the two oblong holes. The rotating handle (10) is mounted at the top center of the laser marking head focus adjustment lifting platform (8). After the rotating handle (10) is rotated, the height of the laser marking head (12) can be adjusted as needed.

4. A laser marking machine according to claim 1, characterized in that: The automatic tool mechanism comprises a paper cutter cylinder (14), a paper cutter (28) and a paper cutter bottom plate (26). The automatic tool is located downstream of the laser printing mechanism. The automatic tool mechanism is installed at the right end of the base (1). A paper cutter cylinder (14) is provided on one side of the top of the automatic tool mechanism. A paper cutter (28) is vertically installed below the paper cutter cylinder (14). The two ends of the paper cutter (28) are not on the same horizontal plane. A paper cutter bottom plate (26) is vertically installed below the paper cutter (28). A label paper outlet is provided in the middle of the paper cutter bottom plate (26). Discharge holes are provided at both ends of the outlet.

5. The laser marking machine according to claim 1, characterized in that: The left and right ends of the upper paper pressing roller (22) are fixed on both sides of the movable frame (21); a bracket (20) is suspended above the movable frame (21); the support brackets on both sides of the bracket (20) are installed on both sides of the middle part of the base (1); a through hole is provided in the center of the top of the bracket (20); a pull rod (29) is vertically installed in the center of the top of the movable frame (21); the pull rod (29) passes through the through hole in the center of the top of the bracket (20); an upper paper pressing roller pressing / lifting handle (19) is installed on the top of the pull rod (29); a circle of spring (30) is sleeved around the pull rod (29); one end of the spring (30) is connected to the center of the top of the movable frame (21), and the other end is connected to the through hole around the top of the bracket (20).

6. According to the laser marking machine as described in claim 1, a vacuum cleaner exhaust port (13) is provided above the right side of the paper feeder.

7. The laser marking machine according to claim 1, characterized in that: The control system comprises a computer and a sensing system, wherein the computer makes the next operation according to the information collected by the sensing system, and the sensing system comprises a paper shortage detection sensor (15), a paper arching sensor (23), an anti-misprinting sensor (27) and a paper discharge detection sensor (24). The transmitting end of the paper shortage detection sensor (15) is arranged above the upper pressure roller (17) and the upper paper pressure roller (22), and the receiving end of the paper shortage detection sensor (15) is arranged below the upper pressure roller (17) and the upper paper pressure roller (22); the transmitting end of the paper arching sensor (23) is arranged at the left end of one side of the limit plate (11) on the right side of the upper paper pressure roller (22); The receiving end of the arching sensor (23) is located at the right end of the other side of the limiting plate (11) on the right side of the upper paper pressing roller (22); the planes where the transmitting end and the receiving end of the paper arching sensor (23) are located are parallel to the plane where the label paper is located according to the standard; the transmitting end of the anti-misprinting sensor (27) is located above the laser marking head (12) and the paper cutter bottom plate (26); the receiving end of the anti-misprinting sensor (27) is located below the laser marking head (12) and the paper cutter bottom plate (26); the transmitting end of the paper discharge detection sensor (24) is located above the right side of the paper cutter (28), and the receiving end of the paper discharge detection sensor (24) is located below the right side of the paper cutter (28).

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