A rotating window for a laser leveling tool
By using the coaxial design of the window protective cover and the rotating limit plate of the laser line marker's rotating window, combined with the elastic structure and the limit slot, the problems of complex assembly and high cost in the existing technology are solved, achieving the effect of simplified assembly and reduced cost.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SNDWAY TECH (GUANGDONG) CO LTD
- Filing Date
- 2025-08-29
- Publication Date
- 2026-06-23
Smart Images
Figure CN224398671U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of measuring instrument technology, and in particular relates to a rotating window for a laser line marker. Background Technology
[0002] A laser line marker is an engineering measurement device that emits a visible beam of light from a laser diode, which is then guided by a prism light-guiding system to form a fan-shaped laser surface. Its laser wavelengths cover two types: 635nm red light and 532nm green light, the latter offering superior visibility in strong light conditions. It is primarily used in building construction, equipment installation, and interior decoration to achieve precise wall vertical alignment, pipeline rack positioning, and other operational needs.
[0003] Currently, commercially available 360-degree laser line marking instruments typically use glass-enclosed windows. This creates opaque or very weakly transparent bonding areas at the glass joints. When the laser beam penetrates the glass and projects onto the work surface, the bonding area obstructs the light, creating a break in the laser line and resulting in a blind spot, affecting work efficiency and project quality. Furthermore, because glass is fragile, the design requires thick ribs at the four corners of the window frame to ensure sufficient strength, further increasing the break point area and creating an even larger blind spot. Therefore, to address the issue of protecting the glass while preventing laser line break points, a laser line marking instrument with a rotatable window has been introduced. A rotatable window means the window housing can rotate freely relative to the outer shell. When workers find that the break point on the laser reference surface coincides with the area requiring marking, they can rotate the window housing to change the break point, ensuring proper marking during work.
[0004] However, the existing rotating window of the laser marking instrument requires the use of hardware structures for coordination. For example, the existing utility model patent "A Rotating Window Cover and Laser Marking Instrument" (patent number: CN222761636U) uses the cooperation of a ball bearing 28 and a groove for rotational limiting. The structure of the ball bearing 28 includes a mounting base, a spring, and a ball bearing, which shows that its structure is relatively complex. This will also lead to complicated assembly during production, thereby affecting production efficiency and increasing costs. Utility Model Content
[0005] (a) Technical problems to be solved
[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a rotating window for a laser line marker, thereby solving the technical problem that the hardware structure of the existing rotating window for laser line markers is relatively complex, which leads to complicated assembly during production, affects production efficiency, and results in high costs.
[0007] (II) Technical Solution
[0008] To achieve the above objectives, the main technical solutions adopted by this utility model include:
[0009] This utility model embodiment provides a rotating window for a laser marking instrument, including a mounting frame, a window protective cover and a rotating limiting plate located on both sides of the mounting frame and coaxially arranged with the mounting frame. The rotating limiting plate abuts against the housing of the laser marking instrument. The mounting frame is fixed to the housing of the laser marking instrument. The window protective cover is fixed to the rotating limiting plate through a connector passing through the mounting frame and can rotate coaxially with the rotating limiting plate relative to the laser marking instrument and the mounting frame. The rotating limiting plate has multiple elastic structures circumferentially arranged on its edge. A limiting protrusion is provided on the end face of the rotating limiting plate near the window protective cover at each elastic structure, allowing the limiting protrusion to elastically displace in a direction parallel to the axis of the laser marking instrument. The mounting frame has multiple limiting slots circumferentially arranged, allowing the limiting protrusion to engage with the limiting slot. Any limiting protrusion can engage with the next limiting slot through the rotation of the rotating limiting plate, so that the rotation angle can be determined by the cooperation between the rotating limiting plate and the mounting frame when rotating the window protective cover.
[0010] Furthermore, the end face edge of the rotating limiting plate away from the window protective cover is provided with multiple arc-shaped grooves, and an arc-shaped through hole is opened on the inner side of the arc-shaped groove on the rotating limiting plate, forming an elastic structure.
[0011] Furthermore, the end face of the window protective cover near the rotating limiting plate is provided with multiple rotating fixing blocks. The multiple rotating fixing blocks are connecting parts. The multiple rotating fixing blocks pass through the mounting fixing frame and the end face of the multiple rotating fixing blocks abuts against the end face of the rotating limiting plate near the window protective cover.
[0012] The rotating limiting plate has multiple screw through holes, and correspondingly, the end face of the rotating fixing block has multiple screw blind holes. The rotating limiting plate and the rotating fixing block are fixed together by screws passing through the corresponding screw through holes and screw blind holes.
[0013] Furthermore, a circular through hole is provided in the middle of the mounting frame, and the outer walls of multiple rotating fixing blocks abut against the inner wall of the circular through hole.
[0014] Furthermore, multiple limiting slots are evenly distributed on the edge of the circular through hole, and correspondingly, multiple arc-shaped grooves are evenly distributed on the rotating limiting plate.
[0015] Furthermore, limit guide posts are provided on the end faces of at least two rotating fixed blocks, and limit guide holes that cooperate with the limit guide posts are provided on the rotating limit plate. The limit guide posts pass through the corresponding limit guide holes to limit the window cover and the rotating limit plate.
[0016] Furthermore, it also includes a glass cover, which is a trapezoidal structure formed by trapezoidal glass panels. The glass cover is located inside the window protective cover, and the end face formed by the small side of each glass panel and the end face formed by the large side of each glass panel respectively abut against the inner wall of the end face of the window protective cover away from the rotation limiting plate and the end face of the rotation limiting plate close to the window protective cover, so that the glass cover can rotate synchronously with the window protective cover and the rotation limiting plate.
[0017] Furthermore, the end faces formed by the small edges of the four glass panes of the glass cover are provided with a first buffer rubber pad, and the end faces formed by the large edges of the four glass panes of the glass cover are provided with a second buffer rubber pad.
[0018] Furthermore, the limiting card protrusion is located in the middle of the corresponding arc-shaped groove.
[0019] Furthermore, the limiting slot is arc-shaped, and the bottom diameter of the limiting protrusion is larger than the opening diameter of the limiting slot. When the limiting slot and the corresponding limiting protrusion are engaged, the bottom of the limiting protrusion is located outside the limiting slot.
[0020] (III) Beneficial Effects
[0021] The beneficial effects of this utility model are:
[0022] This utility model discloses a rotating window for a laser marking instrument. A rotating limiting plate is coaxially mounted on the window protective cover and the mounting frame, positioning the window protective cover and the rotating limiting plate on opposite sides of the mounting frame. The window protective cover is fixed to the rotating limiting plate via a connector passing through the mounting frame and can rotate coaxially with the rotating limiting plate relative to the laser marking instrument and the mounting frame. Multiple elastic structures are circumferentially arranged along the edge of the rotating limiting plate. A limiting protrusion is provided on the end face of the rotating limiting plate near the window protective cover at each elastic structure, allowing the limiting protrusion to elastically displace in a direction parallel to the axis of the laser marking instrument. Multiple limiting slots are circumferentially arranged on the mounting frame, each corresponding to a limiting protrusion. The limiting protrusion can engage with the limiting slot, and any limiting protrusion can engage with the next limiting slot through the rotation of the rotating limiting plate. This allows the rotation angle to be determined by the interaction between the rotating limiting plate and the mounting frame when rotating the window protective cover. Compared to existing technologies, this technology eliminates the need for metal parts and avoids complex assembly during use. The window cover can be rotated to change the break point area, thereby improving assembly efficiency and reducing costs. Attached Figure Description
[0023] Figure 1 A schematic diagram of the rotating window of a laser line marker;
[0024] Figure 2 A schematic diagram of the rotating window of a laser line marker from another perspective;
[0025] Figure 3 An exploded view of the rotating window of a laser marking instrument;
[0026] Figure 4 This is a schematic diagram of the window protective cover.
[0027] Figure 5 A schematic diagram of the structure for installing the fixed frame.
[0028] [Explanation of Labels in the Attached Image]
[0029] 1: Window protective cover; 11: Rotating fixing block; 111: Blind screw hole; 112: Limiting guide post;
[0030] 2: Rotary limiting plate; 21: Arc-shaped groove; 22: Arc-shaped through hole; 23: Limiting bracket protrusion; 24: Screw through hole; 25: Limiting guide hole;
[0031] 3: Mounting frame; 31: Limiting slot; 32: Circular through hole;
[0032] 4: Glass cover;
[0033] 51: First buffer rubber pad; 52: Second buffer rubber pad. Detailed Implementation
[0034] To better explain and facilitate understanding of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and specific embodiments.
[0035] like Figure 1-5 As shown, this utility model provides a rotating window for a laser line marker, such as... Figure 1-3 As shown, the device includes a window protective cover 1, a glass cover 4, a rotating limiting plate 2, and a mounting frame 3, all coaxially arranged. The glass cover 4 is located inside the window protective cover 1. The window protective cover 1 and the rotating limiting plate 2 are located on opposite sides of the mounting frame 3. The rotating limiting plate 2 abuts against the housing of the laser line marker. The mounting frame 3 is fixed to the housing of the laser line marker. The window protective cover 1 is fixed to the rotating limiting plate 2 via a connector passing through the mounting frame 3, and can rotate coaxially with the rotating limiting plate 2 relative to the laser line marker and the mounting frame 3. The glass cover 4 is a trapezoidal structure formed by four trapezoidal glass panels. The end faces formed by the smaller edges and the larger edges of the four glass panels abut against the inner wall of the end face of the window protective cover 1 away from the rotating limiting plate 2 and the end face of the rotating limiting plate 2 near the window protective cover 1, respectively, allowing the glass cover 4 to rotate synchronously with the window protective cover 1 and the rotating limiting plate 2.
[0036] Preferably, the end faces formed by the small edges of the four glass panes of the glass cover 4 are provided with first buffer rubber pads 51, and the end faces formed by the large edges of the four glass panes of the glass cover 4 are provided with second buffer rubber pads 52. The first buffer rubber pads 51 and the second buffer rubber pads 52 respectively isolate the glass from direct contact with the window protective cover 1 and the rotating limiting plate 2. When under pressure, the first buffer rubber pads 51 and the second buffer rubber pads 52 deform, thereby converting the concentrated point pressure or line pressure into a more evenly distributed surface pressure, significantly reducing the local stress of the glass cover 4 and greatly reducing the risk of glass damage due to mechanical stress. Moreover, after being compressed, the first buffer rubber pads 51 and the second buffer rubber pads 52 can respectively fill the tiny gaps between the end faces of the glass cover 4 and the window protective cover 1 and the rotating limiting plate 2, which can play a certain role in dust prevention and moisture prevention. In addition, the friction of the first buffer rubber pads 51 and the second buffer rubber pads 52 is greater than that of the direct contact between the glass cover 4 and the window protective cover 1 and the rotating limiting plate 2, which can increase the stability of the glass cover 4 in the installation position and prevent it from gradually loosening or shifting due to slight vibration.
[0037] like Figure 2 , Figure 3 As shown, the rotating limiting plate 2 is disc-shaped, and multiple elastic structures are arranged around its edge. On the end face of the rotating limiting plate 2 near the window protective cover 1, and at each elastic structure, a limiting protrusion 23 is provided. The elastic structure allows the limiting protrusion 23 to make elastic displacement in a direction parallel to the axis of the laser marking instrument after being squeezed by external force.
[0038] In this embodiment, the end face edge of the rotating limiting plate 2 away from the window protective cover 1 is provided with a plurality of arc-shaped grooves 21. An arc-shaped through hole 22 is provided on the rotating limiting plate 2 inside the arc-shaped groove 21. The arc-shaped through hole 22 is vertical and penetrates the plate surface of the rotating limiting plate 2. The arc-shaped groove 21 forms an elastic structure. The elastic displacement space of the elastic structure is the gap formed between the bottom of the arc-shaped groove 21 and the housing of the laser line marker.
[0039] Preferably, multiple arc-shaped grooves 21 are evenly distributed circumferentially on the rotating limiting plate 2, dividing the circumference of the rotating limiting plate 2 into several specific angular positions. This ensures that the window protective cover 1 can only work stably at specific, pre-designed angles, thus achieving the indexing function. Moreover, since the arc-shaped grooves 21 are evenly distributed circumferentially, each arc-shaped groove 21 has an equal chance of bearing the impact of the mounting frame 3 during operation. This avoids stress concentration and excessive local wear, extending the service life of the rotating limiting plate 2.
[0040] The limiting protrusion 23 is located in the middle of the corresponding arc-shaped groove 21. The symmetrical design means that the operating torque is symmetrical, that is, the force and feel required to rotate clockwise and counterclockwise to the next gear are the same, resulting in a more balanced and comfortable operating experience. Moreover, the symmetrical design makes the wear rate on both sides the same, extending the service life of the rotating limiting plate 2.
[0041] Accordingly, such as Figure 3 , Figure 5 As shown, a circular through hole 32 is provided in the middle of the mounting frame 3, and multiple limiting slots 31 are provided around the mounting frame 3.
[0042] Preferably, multiple limiting slots 31 are evenly distributed circumferentially around the edge of the circular through hole 32.
[0043] Multiple limiting slots 31 correspond one-to-one with multiple limiting protrusions 23. The limiting protrusions 23 can be engaged into the limiting slots 31, and any limiting protrusion 23 can be engaged into the next limiting slot 31 by rotating the limiting plate 2. This allows the rotation angle to be determined by the interaction between the rotating limiting plate 2 and the mounting frame 3 when rotating the window cover 1. The design of the limiting slots 31 and limiting protrusions 23 allows the limiting protrusions 23 to slide into and out of each limiting slot 31 in sequence when rotating the window cover 1. When sliding out of the limiting slot 31, a certain resistance needs to be overcome, and when sliding into the next limiting slot 31, a noticeable jolt or "click" sound is produced.
[0044] This tactile and auditory feedback allows the operator to perceive whether the angle has been switched to the correct position without visual confirmation (blind operation), greatly improving the user experience and human-computer interaction of the product. Moreover, when the limit card protrusion 23 is engaged with the limit card slot 31, the window protective cover 1 and the rotating limit plate 2 are in a stable mechanical state, which can resist slight vibration or external force interference and prevent them from rotating or shifting on their own.
[0045] Preferably, the limiting groove 31 is arc-shaped, and the bottom diameter of the limiting protrusion 23 is larger than the opening diameter of the limiting groove 31. When the limiting groove 31 is engaged with the corresponding limiting protrusion 23, the bottom of the limiting protrusion 23 is located outside the limiting groove 31, which can effectively prevent the window protective cover 1 from shaking due to the rotating limiting plate 2 not being securely fastened.
[0046] like Figure 3 , Figure 4As shown, a plurality of rotating fixing blocks 11 are provided on the end face of the window protective cover 1 near the rotating limiting plate 2. In this embodiment, the plurality of rotating fixing blocks 11 are the connecting members. The outer edges of the plurality of rotating fixing blocks 11 are all arcs and are all in the same circular trajectory. When the window protective cover 1 is fixed to the rotating limiting plate 2, the plurality of rotating fixing blocks 11 pass through the mounting fixing frame 3 and the outer wall of the plurality of rotating fixing blocks 11 abuts against the inner wall of the circular through hole 32, thereby limiting the window protective cover 1. At the same time, the end face of the plurality of rotating fixing blocks 11 abuts against the end face of the rotating limiting plate 2 near the window protective cover 1.
[0047] like Figure 2-4 As shown, the rotating limiting plate 2 has multiple screw through holes 24, and correspondingly, the rotating fixing block 11 has multiple screw blind holes 111 on its end face. The rotating limiting plate 2 and the rotating fixing block 11 are fixed together by screws passing through the corresponding screw through holes 24 and screw blind holes 111.
[0048] like Figure 4 As shown, at least two rotating fixing blocks 11 are provided with limiting guide posts 112 on their end faces. The rotating limiting plate 2 is provided with limiting guide holes 25 that cooperate with the limiting guide posts 112. The limiting guide posts 112 pass through the corresponding limiting guide holes 25 to limit the window protective cover 1 and the rotating limiting plate 2. This allows the operator to automatically and accurately position the window protective cover 1 and the rotating limiting plate 2 without relying on visual fine adjustments or using complex tooling fixtures when assembling the window protective cover 1 and the rotating limiting plate 2. The operator only needs to fit the limiting guide holes 25 on the rotating limiting plate 2 onto the limiting guide posts 112 of the rotating fixing block 11. This significantly shortens the assembly time and improves assembly efficiency and consistency.
[0049] Furthermore, the engagement between the limiting guide post 112 and the limiting guide hole 25 not only provides limiting but also pre-installation support. Like a "pin," it ensures a stable relative relationship between the window cover 1 and the rotating limiting plate 2 before final tightening (screwing). It temporarily supports the rotating limiting plate 2, preventing displacement during tightening and freeing up the operator's hands. After assembly, it also shares some of the lateral force from the rotating limiting plate 2, improving the rigidity and stability of the overall structure.
[0050] Working principle: When the laser line emitted by the laser marker needs to be rotated to form a break in the laser line, the window of the laser marker is rotated. Since the window guard 1 is fixed to the rotation limiting plate 2, and the mounting frame 3 is fixed to the laser marker, the window guard 1, along with the rotation limiting plate 2, rotates relative to the laser marker and also relative to the mounting frame 3. The rotation is achieved by moving the limiting protrusion 23 on the rotation limiting plate 2 from one limiting slot 31 on the mounting frame 3 to the next limiting slot 31. In this process, firstly, before rotating the window protective cover 1, the limiting protrusion 23 is in the initial position. At this time, the elastic structure is in a natural state without deformation, that is, the arc groove 21 is not deformed. When rotating the window protective cover 1, the limiting protrusion 23 rotates out of the limiting slot 31. The limiting protrusion 23 will be squeezed upward by the mounting frame 3 and move towards the elastic displacement space, that is, move towards the gap formed between the bottom of the arc groove 21 and the housing of the laser marker. At this time, the elastic structure deforms, that is, the limiting protrusion 23 moves with the arc groove 21 towards the gap formed between the bottom of the arc groove 21 and the housing of the laser marker. When the limiting protrusion 23 enters the next limiting slot 31, the squeezing force on the limiting protrusion 23 disappears, and the limiting protrusion 23 returns to the initial position. Thus, the window protective cover 1 completes one rotation.
[0051] In the description of this utility model, it should be understood that the terms "first" and "second" 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. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0052] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; 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; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.
[0053] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0054] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0055] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.
Claims
1. A rotating window for a laser line marker, characterized in that, The device includes a mounting frame (3) and a window protective cover (1) and a rotating limiting plate (2) located on both sides of the mounting frame (3) and coaxially arranged with the mounting frame (3). The rotating limiting plate (2) abuts against the housing of the laser marking instrument. The mounting frame (3) is fixed to the housing of the laser marking instrument. The window protective cover (1) is fixed to the rotating limiting plate (2) through a connector passing through the mounting frame (3) and can rotate coaxially with the rotating limiting plate (2) relative to the laser marking instrument and the mounting frame (3). The rotating limiting plate (2) has multiple elastic structures arranged around its edge. The rotating limiting plate (2) is provided with a limiting protrusion (23) on the end face of the window protective cover (1) and at each of the elastic structures, so that the limiting protrusion (23) can make elastic displacement in a direction parallel to the axis of the laser marking instrument. The mounting frame (3) is provided with multiple limiting slots (31) in the circumferential direction. The limiting protrusion (23) can be inserted into the limiting slot (31), and any limiting protrusion (23) can be inserted into the next limiting slot (31) by rotating the rotating limiting plate (2). When rotating the window cover (1), the rotation angle can be determined by the cooperation between the rotating limiting plate (2) and the mounting frame (3).
2. The rotating window of the laser marking instrument according to claim 1, characterized in that, The rotating limiting plate (2) has multiple arc-shaped grooves (21) on the edge of its end face away from the window protective cover (1). An arc-shaped through hole (22) is opened on the rotating limiting plate (2) inside the arc-shaped groove (21). The arc-shaped groove (21) forms an elastic structure.
3. The rotating window of the laser marking instrument according to claim 1, characterized in that, The window protective cover (1) is provided with a plurality of rotating fixing blocks (11) on the end face near the rotating limiting plate (2). The plurality of rotating fixing blocks (11) are the connecting parts. The plurality of rotating fixing blocks (11) pass through the mounting fixing frame (3) and the end face of the plurality of rotating fixing blocks (11) abuts against the end face of the rotating limiting plate (2) near the window protective cover (1). The rotating limiting plate (2) has multiple screw through holes (24), and correspondingly, the rotating fixing block (11) has multiple screw blind holes (111) on its end face. The rotating limiting plate (2) and the rotating fixing block (11) are fixed together by screws passing through the corresponding screw through holes (24) and screw blind holes (111).
4. The rotating window of the laser marking instrument according to claim 3, characterized in that, The mounting frame (3) has a circular through hole (32) in the middle, and the outer walls of the multiple rotating fixing blocks (11) abut against the inner wall of the circular through hole (32).
5. The rotating window of the laser marking instrument according to claim 4, characterized in that, Multiple limiting slots (31) are evenly distributed on the edge of the circular through hole (32), and correspondingly, multiple arc-shaped grooves (21) are evenly distributed on the rotating limiting plate (2).
6. The rotating window of the laser marking instrument according to claim 4, characterized in that, At least two of the rotating fixing blocks (11) are provided with limiting guide posts (112) on their end faces. The rotating limiting plate (2) is provided with limiting guide holes (25) that cooperate with the limiting guide posts (112). The limiting guide posts (112) pass through the corresponding limiting guide holes (25) to limit the window cover (1) and the rotating limiting plate (2).
7. The rotating window of the laser marking instrument according to claim 1, characterized in that, It also includes a glass cover (4), which is a trapezoidal structure formed by four trapezoidal glass pieces. The glass cover (4) is located inside the window protective cover (1), and the end face formed by the small side of the four glass pieces and the end face formed by the large side of the four glass pieces respectively abut against the inner wall of the end face of the window protective cover (1) away from the rotating limiting plate (2) and the end face of the rotating limiting plate (2) close to the window protective cover (1), so that the glass cover (4) can rotate synchronously with the window protective cover (1) and the rotating limiting plate (2).
8. The rotating window of the laser marking instrument according to claim 7, characterized in that, The end face formed by the four small edges of the glass cover (4) is provided with a first buffer rubber pad (51), and the end face formed by the four large edges of the glass cover (4) is provided with a second buffer rubber pad (52).
9. The rotating window of the laser marking instrument according to claim 2, characterized in that, The limiting protrusion (23) is located in the middle of the corresponding arc-shaped groove (21).
10. The rotating window of the laser marking instrument according to claim 1, characterized in that, The limiting slot (31) is arc-shaped, and the bottom diameter of the limiting protrusion (23) is larger than the opening diameter of the limiting slot (31). When the limiting slot (31) and the corresponding limiting protrusion (23) are engaged, the bottom of the limiting protrusion (23) is located outside the limiting slot (31).