Convenient-to-mount laser head of laser cutting engraving machine

Abstract

The utility model provides a laser cutting engraving machine laser head convenient to install. The laser cutting engraving machine laser head convenient to install comprises a reflector support, a detachable connecting structure, a fixing plate, a cutting head body, a reflector assembly, a focus lens assembly and a cutting nozzle assembly. The reflector support is obliquely arranged on the fixing plate, one side of the cutting head body is an inclined face, and the inclined face is connected with the reflector support through a detachable connecting structure. The reflector assembly is arranged on the inner side of the cutting head body and connected with the detachable connecting structure, the top of the focus lens assembly is connected with the cutting head body, and the bottom of the focus lens assembly is connected with the cutting nozzle assembly. According to the laser cutting and engraving machine laser head convenient to install, the problems that due to design limitation of a reflector of a laser head in the related technology, the reflector can be detached and cleaned only through a special tool, and the detaching process is tedious and consumes time are solved.

Description

Technical Field

[0001] This utility model belongs to the field of laser cutting technology, and in particular relates to a laser head for a laser cutting and engraving machine that is easy to install. Background Technology

[0002] The laser head of a laser cutting and engraving machine is a crucial component, primarily used to focus and emit a laser beam to cut and engrave materials. The laser head typically consists of lenses, nozzles, and sensors, and its function is to precisely guide the laser beam onto the surface of the material being processed. This technology can be applied to various materials such as metals, wood, and plastics, offering advantages such as high precision, high efficiency, and non-contact processing. During use, the maintenance and cleaning of the laser head are essential to ensure the quality of cutting and engraving.

[0003] In laser cutting and engraving machines, cleaning the reflector is crucial for ensuring laser beam transmission efficiency and processing quality. Due to limitations in the design of the laser head's reflector in related technologies, special tools are often required to disassemble and clean it, leading to a cumbersome and time-consuming disassembly process. Furthermore, during disassembly and reassembly, the reflector's position may shift, causing the laser beam to misalign with the target, thus affecting cutting or engraving precision. This, in turn, can result in a decline in the quality of the final product, such as uneven cut edges or blurry engraved patterns. Summary of the Invention

[0004] In view of this, the present invention aims to at least partially solve one of the related technical problems.

[0005] To achieve the above objectives, the technical solution of this utility model is implemented as follows:

[0006] A laser head for an easy-to-install laser cutting and engraving machine includes a reflector bracket, a detachable connection structure, a fixing plate, a cutting head body, a reflector assembly, a focusing lens assembly, and a cutting nozzle assembly;

[0007] The reflector bracket is inclinedly mounted on the fixed plate, and one side of the cutting head body is a slope, which is connected to the reflector bracket through the detachable connection structure.

[0008] The reflector assembly is disposed inside the cutting head body, the reflector assembly is connected to the detachable connection structure, the top of the focusing lens assembly is connected to the cutting head body, and the bottom of the focusing lens assembly is connected to the cutting nozzle assembly;

[0009] The detachable connection structure includes a supporting steel ball, two tensioning mechanisms, two adjusting mechanisms, and two locking bolts. The two tensioning mechanisms and the two adjusting mechanisms are symmetrically arranged on the reflector bracket. The tensioning end of each tensioning mechanism is connected to the reflector assembly. Each adjusting mechanism is used to adjust the reflector assembly. The reflector assembly cooperates with the reflector bracket through the supporting steel ball. The cutting head body is connected to the reflector bracket through the two locking bolts.

[0010] Furthermore, the reflector mount of the reflector assembly is a circular plate, the tensioning ends of the two tensioning mechanisms are located on one side of the reflector mount, the supporting steel ball is located on the other side of the reflector mount, and the adjustment ends of the two adjustment mechanisms are symmetrically located in the middle of the reflector mount, with the adjustment ends of the two adjustment mechanisms forming a 90° angle with the position of the supporting steel ball.

[0011] Furthermore, the tensioning mechanism includes a fixed sleeve and an elastic element. The fixed sleeve is disposed on the reflector bracket, and the elastic element is disposed inside the fixed sleeve. One end of the elastic element is connected to the fixed sleeve, and the other end of the elastic element is connected to the reflector base.

[0012] Furthermore, the adjustment mechanism includes an adjustment screw and a locking nut. The adjustment screw is threadedly engaged with the reflector bracket. The inner end of the adjustment screw abuts against the reflector seat, and the outer end of the adjustment screw engages with the locking nut.

[0013] Furthermore, the detachable connection structure also includes two first positioning pins, which are symmetrically arranged on the inclined surface. Both first positioning pins are used to position the cutting head body and the reflector bracket.

[0014] Furthermore, it also includes a protective structure, wherein a light inlet is provided on the side of the cutting head body away from the inclined plane, and the protective structure is disposed on the light inlet.

[0015] Furthermore, the protective structure includes a protective mirror and a protective mirror mounting base, the protective mirror mounting base being disposed at the light inlet position, and the protective mirror and the protective mirror mounting base being detachably connected.

[0016] Furthermore, the focusing lens assembly includes a focusing lens mounting base and a focusing lens holder. The top of the focusing lens holder is connected to the cutting head body via a threaded structure. The focusing lens mounting base is used to position the focusing lens holder. The focusing lens mounting base is positioned above the focusing lens holder. The upper part of the focusing lens mounting base has a protruding structure. The lower part of the housing of the cutting head body has a threaded structure that can cooperate with the protrusion. The focusing lens holder is a cylindrical structure, and the outer wall of the focusing lens holder has a screwing structure.

[0017] Furthermore, the cutting nozzle assembly includes a cutting nozzle mounting base and a cutting nozzle. The cutting nozzle mounting base is connected to the mounting plate via an installation structure. The upper part of the cutting nozzle mounting base mates with the focusing lens mount, and the lower part of the cutting nozzle mounting base is threadedly connected to the cutting nozzle.

[0018] Furthermore, the cutting nozzle assembly also includes a cutting nozzle outer sleeve, a micro switch, a second positioning pin, and two spring positioning pins. The cutting nozzle outer sleeve is clearance-fitted with the bottom of the cutting nozzle. The micro switch and the two spring positioning pins are all disposed on the lower end face of the cutting nozzle fixing seat. The cutting nozzle outer sleeve is connected to the cutting nozzle fixing seat through the second positioning pin. The cutting nozzle outer sleeve can trigger the micro switch.

[0019] Compared with existing technologies, the laser head for laser cutting and engraving machines described in this utility model, which is easy to install, has the following advantages:

[0020] 1. The detachable connection structure makes the installation and maintenance of the laser head of the laser cutting and engraving machine simpler and more efficient. Through the combination of components such as support steel balls, tensioning mechanism, adjustment mechanism, and locking bolts, a stable connection and quick disassembly of the laser head are achieved. The support steel balls provide smooth support, allowing the reflector to be easily adjusted. The elastic element in the tensioning mechanism ensures the stability of the connection while allowing a degree of fine-tuning to adapt to different working needs. The adjustment mechanism, through the adjusting screw and locking nut, allows users to precisely control the position of the reflector assembly, ensuring correct laser beam alignment and thus improving processing accuracy. The use of the first locating pin ensures precise positioning between the cutting head body and the reflector bracket, reducing errors caused by improper installation and improving the reliability of the entire structure.

[0021] 2. The protective lens and mounting bracket in the protective structure effectively protect the light inlet, preventing dust, smoke, or other impurities from entering critical optical components. This keeps the laser head clean and reduces the impact of contamination on laser cutting and engraving quality. Since the protective lens and mounting bracket are detachable, users can easily clean and replace them. This simplifies daily maintenance, reduces equipment downtime, and improves production efficiency. By preventing the intrusion of external particles, the protective structure ensures stable laser beam transmission, maintaining high-precision cutting and engraving results. The use of a protective lens reduces wear on optical components within the laser head, thereby extending the lifespan of these critical components and reducing overall equipment maintenance costs.

[0022] 3. The focusing lens mount can be quickly removed from the machine, significantly simplifying the cleaning and maintenance process, reducing equipment downtime, and improving overall work efficiency. Users do not need to spend extra time on disassembly and reinstallation, allowing for more flexible daily maintenance. Because the focusing lens bracket is fixed in place by the lower focusing lens mount, the focusing lens position remains stable. After each replacement or cleaning, users do not need to readjust the focusing lens position, ensuring consistent processing accuracy and quality. The robust fixing method of the focusing lens mount reduces potential vibration and displacement of the lens during operation, ensuring the laser beam is always precisely focused on the target area. This improves processing stability and consistency, adapting to the complex processing needs of various materials. Attached Figure Description

[0023] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of the utility model. The illustrative embodiments of the utility model and their descriptions are used to explain the utility model and do not constitute an undue limitation of the utility model. In the drawings:

[0024] Figure 1 This is a schematic diagram of a laser head for a laser cutting and engraving machine that is easy to install, as described in an embodiment of this utility model.

[0025] Figure 2 This is a schematic diagram of the protective mirror structure according to an embodiment of the present utility model;

[0026] Figure 3 This is a schematic diagram of the combined structure of the reflector bracket and the detachable connection structure according to an embodiment of the present utility model;

[0027] Figure 4 This is a schematic diagram of the detachable connection structure described in an embodiment of the present utility model;

[0028] Figure 5 This is a schematic diagram of the focusing lens assembly structure according to an embodiment of the present utility model;

[0029] Figure 6 This is a schematic diagram of the installation structure described in an embodiment of the present utility model;

[0030] Figure 7 This is a schematic diagram of the cutting nozzle outer sleeve structure according to an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached figures:

[0032] 1. Cutting head body; 2. Detachable connection structure; 200. Reflector bracket; 210. Locking bolt; 220. Tensioning mechanism; 221. Elastic element; 222. Pin; 230. Adjustment mechanism; 231. Adjustment screw; 240. Supporting steel ball; 250. First positioning pin; 260. Reflector mount; 3. Fixing plate; 310. Connecting bolt; 320. Pin hole; 4. Protective lens mounting base; 5. Focusing lens mounting base; 6. Focusing lens mount; 7. Cutting nozzle fixing base; 8. Cutting nozzle; 16. Protective lens; 19. Micro switch; 21. Spring positioning pin; 22. Cutting nozzle outer sleeve; 25. Second positioning pin. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0034] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0035] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0036] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0037] An easy-to-install laser head for laser cutting and engraving machines, such as Figure 1As shown, the device includes a reflector bracket 200, a detachable connecting structure 2, a fixing plate 3, a cutting head body 1, a reflector assembly, a focusing lens assembly, and a cutting nozzle assembly. The reflector bracket 200 is inclinedly mounted on the fixing plate 3. One side of the cutting head body 1 is a slope, which is connected to the reflector bracket 200 via the detachable connecting structure 2. The reflector assembly is located inside the cutting head body 1 and is connected to the detachable connecting structure 2. The top of the focusing lens assembly is connected to the cutting head body 1, and the bottom of the focusing lens assembly is connected to the cutting nozzle assembly.

[0038] The detachable connection structure 2 includes a supporting steel ball 240, two tensioning mechanisms 220, two adjusting mechanisms 230, and two locking bolts 210. The two tensioning mechanisms 220 and the two adjusting mechanisms 230 are symmetrically arranged on the reflector bracket 200. The tensioning end of each tensioning mechanism 220 is connected to the reflector assembly. Each adjusting mechanism 230 is used to adjust the reflector assembly. The reflector assembly is connected to the reflector bracket 200 via the supporting steel ball 240. The cutting head body 1 is connected to the reflector bracket 200 via the two locking bolts 210. The detachable connection structure 2 also includes two first positioning pins 250, symmetrically arranged on the inclined surface. Both first positioning pins 250 are used to position the cutting head body 1 against the reflector bracket 200. The detachable connection structure 2 makes the installation and maintenance of the laser head of the laser cutting and engraving machine simpler and more efficient. The combination of components such as the supporting steel ball 240, tensioning mechanism 220, adjusting mechanism 230, and locking bolt 210 enables stable connection and quick disassembly of the laser head. The supporting steel ball 240 provides smooth support, allowing the reflector to be easily adjusted in position. The elastic element 221 in the tensioning mechanism 220 ensures the stability of the connection while allowing for a degree of fine-tuning to adapt to different working requirements. The adjusting mechanism 230, through the adjusting screw 231 and locking nut, allows the user to precisely control the position of the reflector assembly, ensuring correct alignment of the laser beam and thus improving processing accuracy. The use of the first positioning pin 250 ensures precise positioning between the cutting head body 1 and the reflector bracket 200, reducing errors caused by improper installation and improving the reliability of the entire structure.

[0039] The reflector mount 260 of the reflector assembly is a circular plate. The tensioning ends of the two tensioning mechanisms 220 are located on one side of the reflector mount 260, and the supporting steel ball 240 is located on the other side of the reflector mount 260. The adjustment ends of the two adjustment mechanisms 230 are symmetrically located in the middle of the reflector mount 260, and the adjustment ends of the two adjustment mechanisms 230 form a 90° angle with the position of the supporting steel ball 240.

[0040] The tensioning mechanism 220 includes a fixed sleeve and an elastic element 221. The fixed sleeve is mounted on the reflector bracket 200, and the elastic element 221 is located inside the fixed sleeve. One end of the elastic element 221 is connected to the fixed sleeve, and the other end is connected to the reflector mount 260. The elastic element is an elastic belt or a tension spring.

[0041] The adjustment mechanism 230 includes an adjustment screw 231 and a locking nut. The adjustment screw 231 is threaded into the rearview mirror bracket 200. The inner end of the adjustment screw 231 abuts against the rearview mirror mount 260, and the outer end of the adjustment screw 231 engages with the locking nut. One adjustment mechanism 230 is used to achieve X-axis adjustment of the rearview mirror mount 260, and the other adjustment mechanism 230 is used to achieve Y-axis adjustment of the rearview mirror mount 260.

[0042] The system also includes a protective structure. A light inlet is located on the side of the cutting head body 1 away from the inclined plane, and the protective structure is mounted on this inlet. The protective structure includes a protective mirror 16 and a protective mirror mounting base 4. The protective mirror mounting base 4 is located at the light inlet, and the protective mirror 16 is detachably connected to it. The protective mirror 16 is mounted inside the protective mirror mounting base 4 via a pressure ring. The protective mirror 16 and the protective mirror mounting base 4 effectively protect the light inlet, preventing dust, smoke, or other impurities from entering the critical optical components. This keeps the laser head clean and reduces the impact of contamination on laser cutting and engraving quality. Because the protective mirror 16 and the protective mirror mounting base 4 are detachably connected, users can easily clean and replace them. This simplifies daily maintenance, reduces equipment downtime, and improves production efficiency. By preventing the intrusion of external particles, the protective structure ensures stable laser beam transmission, maintaining high-precision cutting and engraving results. The use of the protective mirror 16 reduces wear on the optical components inside the laser head, thereby extending the lifespan of these critical components and reducing the overall maintenance cost of the equipment.

[0043] The focusing lens assembly includes a focusing lens mount 5 and a focusing lens holder 6. The top of the focusing lens holder 6 is connected to the cutting head body 1 via a threaded structure. The focusing lens mount 5 is used to position the focusing lens holder 6 and is positioned above the focusing lens holder 6. The upper part of the focusing lens mount 5 has a protruding structure, and the lower part of the housing of the cutting head body 1 has a threaded structure that mates with the protrusion. The focusing lens holder 6 is a cylindrical structure with internal space for mounting focusing lenses with focal lengths of 1.5 and 2.0 inches. The outer wall of the focusing lens holder 6 has a screwing structure. The focusing lens mount 5 can be quickly removed from the machine, significantly simplifying the cleaning and maintenance process, reducing equipment downtime, and improving overall work efficiency. Users do not need to spend extra time on disassembly and reinstallation, allowing for more flexible daily maintenance. Because the focusing lens holder is fixed by the lower focusing lens holder, the position of the focusing lens remains stable. After each replacement or cleaning, the user does not need to readjust the position of the focusing lens, ensuring consistent processing accuracy and quality. The robust fixing method of the focusing lens mount 5 reduces the vibration and displacement that the lens may experience during operation, ensuring that the laser beam is always precisely focused on the target area. This improves the stability and consistency of processing, adapting to the complex processing requirements of various materials.

[0044] The cutting nozzle assembly includes a cutting nozzle holder 7 and a cutting nozzle 8. The cutting nozzle holder 7 is connected to the mounting plate 3 via a mounting structure. The upper part of the cutting nozzle holder 7 mates with the focusing lens mount 6, and the lower part of the cutting nozzle holder 7 is threadedly connected to the cutting nozzle. The cutting nozzle assembly also includes a cutting nozzle sleeve 22, a micro switch 19, a second positioning pin 25, and two spring positioning pins 21. The cutting nozzle sleeve 22 has a clearance fit with the bottom of the cutting nozzle 8. The micro switch 19 and the two spring positioning pins 21 are all located on the lower end face of the cutting nozzle holder 7. The cutting nozzle sleeve 22 is connected to the cutting nozzle holder 7 via the second positioning pin 25, and the cutting nozzle sleeve 22 can trigger the micro switch 19. In this example, the mounting structure includes a connecting bolt 310 and a third positioning pin. The mounting plate 3 has a pin hole 320 that mates with the third positioning pin. The cutting nozzle holder 7 is connected to the mounting plate 3 via the connecting bolt 310 and the third positioning pin.

[0045] In the cutting head system, a cutting nozzle sleeve 22 is installed on the cutting nozzle. The sleeve consists of two parts, left and right, which are fixed to the cutting nozzle 8 after being assembled with screws. A second positioning pin 25 prevents the cutting nozzle sleeve 22 from rotating. When the laser head contacts the surface of the material to be processed, the cutting nozzle sleeve 22 moves upward, triggering the micro switch 19 to achieve automatic focusing. Simultaneously, the spring positioning pin 21 prevents the cutting nozzle sleeve 22 from accidentally triggering the micro switch 19 due to bouncing during high-speed cutting head operation, and also reduces potential abnormal noises during cutting head operation. These components work together to improve the accuracy and stability of the equipment. The micro switch 19 is used to control the height of the cutting platform.

[0046] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A laser head for a laser cutting and engraving machine that is easy to install, characterized in that: Includes a reflector bracket (200), a detachable connection structure (2), a fixing plate (3), a cutting head body (1), a reflector assembly, a focusing lens assembly, and a cutting nozzle assembly; The reflector bracket (200) is inclinedly mounted on the fixing plate (3). One side of the cutting head body (1) is a slope, and the slope is connected to the reflector bracket (200) through the detachable connection structure (2). The reflector assembly is disposed inside the cutting head body (1). The reflector assembly is connected to the detachable connection structure (2). The top of the focusing lens assembly is connected to the cutting head body (1), and the bottom of the focusing lens assembly is connected to the cutting nozzle assembly. The detachable connection structure (2) includes a supporting steel ball (240), two tensioning mechanisms (220), two adjusting mechanisms (230), and two locking bolts (210). The two tensioning mechanisms (220) and the two adjusting mechanisms (230) are symmetrically arranged on the reflector bracket (200). The tensioning end of each tensioning mechanism (220) is connected to the reflector assembly. Each adjusting mechanism (230) is used to adjust the reflector assembly. The reflector assembly cooperates with the reflector bracket (200) through the supporting steel ball (240). The cutting head body (1) is connected to the reflector bracket (200) through the two locking bolts (210).

2. The laser head for an easy-to-install laser cutting and engraving machine according to claim 1, characterized in that: The reflector mount (260) of the reflector assembly is a circular plate. The tensioning ends of the two tensioning mechanisms (220) are located on one side of the reflector mount (260), and the supporting steel ball (240) is located on the other side of the reflector mount (260). The adjustment ends of the two adjustment mechanisms (230) are symmetrically located in the middle of the reflector mount (260), and the adjustment ends of the two adjustment mechanisms (230) form a 90° angle with the position of the supporting steel ball (240).

3. The laser head for an easy-to-install laser cutting and engraving machine according to claim 2, characterized in that: The tensioning mechanism (220) includes a fixed sleeve and an elastic element (221). The fixed sleeve is disposed on the reflector bracket (200), and the elastic element (221) is disposed inside the fixed sleeve. One end of the elastic element (221) is connected to the fixed sleeve, and the other end of the elastic element (221) is connected to the reflector mount (260).

4. The laser head for an easy-to-install laser cutting and engraving machine according to claim 2, characterized in that: The adjustment mechanism (230) includes an adjustment screw (231) and a locking nut. The adjustment screw (231) is threadedly engaged with the reflector bracket (200). The inner end of the adjustment screw (231) abuts against the reflector seat (260), and the outer end of the adjustment screw (231) engages with the locking nut.

5. A laser head for an easy-to-install laser cutting and engraving machine according to claim 3, characterized in that: The detachable connection structure (2) also includes two first positioning pins (250), which are symmetrically arranged on the inclined surface. Both first positioning pins (250) are used to position the cutting head body (1) and the reflector bracket (200).

6. A laser head for an easy-to-install laser cutting and engraving machine according to any one of claims 1-5, characterized in that: It also includes a protective structure, wherein the cutting head body (1) has a light inlet on the side away from the inclined plane, and the protective structure is disposed on the light inlet.

7. A laser head for an easy-to-install laser cutting and engraving machine according to claim 6, characterized in that: The protective structure includes a protective mirror (16) and a protective mirror mounting base (4). The protective mirror mounting base (4) is located at the light inlet. The protective mirror (16) and the protective mirror mounting base (4) are detachably connected.

8. A laser head for an easy-to-install laser cutting and engraving machine according to claim 6, characterized in that: The focusing lens assembly includes a focusing lens mounting base (5) and a focusing lens seat (6). The top of the focusing lens seat (6) is connected to the cutting head body (1) via a threaded structure. The focusing lens mounting base (5) is used to position the focusing lens seat (6). The focusing lens mounting base (5) is located above the focusing lens seat (6). The upper part of the focusing lens mounting base (5) is provided with a protruding structure. The lower part of the shell of the cutting head body (1) is provided with a threaded structure that can cooperate with the protrusion. The focusing lens seat (6) is a cylindrical structure. The outer wall of the focusing lens seat (6) is provided with a screwing structure.

9. A laser head for an easy-to-install laser cutting and engraving machine according to claim 8, characterized in that: The cutting nozzle assembly includes a cutting nozzle holder (7) and a cutting nozzle (8). The cutting nozzle holder (7) is connected to the fixing plate (3) through an installation structure. The upper part of the cutting nozzle holder (7) cooperates with the focusing lens mount (6), and the lower part of the cutting nozzle holder (7) is threadedly connected to the cutting nozzle.

10. A laser head for an easy-to-install laser cutting and engraving machine according to claim 9, characterized in that: The cutting nozzle assembly also includes a cutting nozzle sleeve (22), a micro switch (19), a second positioning pin (25), and two spring positioning pins (21). The cutting nozzle sleeve (22) is in clearance fit with the bottom of the cutting nozzle (8). The micro switch (19) and the two spring positioning pins (21) are all located on the lower end face of the cutting nozzle fixing seat (7). The cutting nozzle sleeve (22) is connected to the cutting nozzle fixing seat (7) through the second positioning pin (25). The cutting nozzle sleeve (22) can trigger the micro switch (19).

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