A rotary marking device for a laser engraving machine

Abstract

The utility model relates to a laser carving machine rotation marking technology field especially relates to a laser carving machine rotation marking device. Including support base plate, support frame, the upper end of support frame is provided with support base plate, the upper end surface fixed connection of support base plate has the cylinder, the output of cylinder installs rotating arm rod, and one end of rotating arm rod is provided with drive synchronous wheel, and the bottom of drive synchronous wheel installs and marks the jaw, and the surface of marking jaw is provided with processing piece, and the end of support frame and support base plate each other is provided with adjusting device, and adjusting device includes base, and the surface fixed connection of base with support base plate is with the help of auxiliary device, and the upper surface of base is provided with connecting groove, and the bottom end surface fixed connection of support frame has the connecting block, and the surface of connecting block and the inner wall of connecting groove are inserted jointed. The utility model provides a laser carving machine rotation marking device has the advantage that it is convenient to split installation limiting protection to rotation marking equipment.

Description

Technical Field

[0001] This utility model relates to the field of laser engraving machine rotary marking technology, and in particular to a laser engraving machine rotary marking device. Background Technology

[0002] Laser engraving machines are high-tech devices widely used for precision marking, engraving, and cutting, commonly used for surface processing of materials such as metal, plastic, and glass. They work by interacting a laser beam with the surface of an object, generating high temperatures that evaporate or ablate the surface material, thus etching patterns, text, or images. Due to its advantages such as high precision, non-contact processing, and the elimination of molds, laser engraving is widely used in industries such as electronics, automobiles, home appliances, medical equipment, jewelry, and tools. Rotary marking devices refer to devices where the workpiece can rotate under the action of the laser beam, usually through mechanical rotation or electric drive, allowing for multi-angle and omnidirectional laser marking. This type of device enables laser engraving machines to handle complex workpiece shapes more efficiently, improve marking accuracy and consistency, and thus broaden its application range.

[0003] Existing technologies, such as the utility model patent with publication number CN221560137U, disclose a multi-station laser marking structure. This patent includes a rotating device of a multi-station laser marking machine and a laser marking frame installed on the top of the rotating device. A placement tray is fixedly installed on the top of the rotating device. The surface of the placement tray has multiple placement slots for placing materials. Multiple clamping components for holding materials are installed at the bottom of the placement slots. An adjusting component for adjusting the clamping components is installed on one side of the clamping component. The cylindrical material to be laser-marked is placed into the inner wall of the placement slot. Pushing the cylindrical material causes the adjusting component to move the sliding plate. The connecting piece drives the clamping block to slide on the slide rod to accommodate and fix different cylindrical materials. The moving sliding plate drives the fixing block to move. The fixing block drives the elastic component to stretch and quickly reset, fixing the cylindrical material. The rotating device is started to laser mark the material on the placement tray, which can speed up the laser marking of batch materials.

[0004] During the operation of a laser engraving machine, the support frame and base are directly fixed with multiple bolts, which makes assembly and disassembly cumbersome, height adjustment difficult, and requires special tools. This leads to low efficiency in equipment replacement and maintenance, and the connection is prone to loosening under long-term vibration, affecting the marking accuracy and stability. Utility Model Content

[0005] The purpose of this utility model is to solve the shortcomings of existing laser engraving machine rotary marking equipment, which is subject to the following problems during operation: the support frame and the base are directly fixed by multiple bolts, which makes the assembly and disassembly cumbersome, the height adjustment difficult and requires special tools, resulting in low efficiency of equipment changeover and maintenance, and the connection is prone to loosening under long-term vibration, affecting the marking accuracy and stability.

[0006] To solve the above technical problems, this utility model provides a rotating marking device for a laser engraving machine, comprising: a supporting base plate and a supporting frame. The supporting base plate is provided at the upper end of the supporting frame. A cylinder is fixedly connected to the upper surface of the supporting base plate. A rotating arm is installed at the output end of the cylinder. A drive synchronous wheel is provided at one end of the rotating arm. A marking gripper is installed at the bottom end of the drive synchronous wheel. A workpiece is provided on the surface of the marking gripper. An adjustment device is provided at the end of the supporting frame and the supporting base plate that are close to each other. The adjustment device includes a base, and the base is connected to the supporting frame by means of an auxiliary device. The base plate is fixedly connected to the surface of the base. A connecting groove is formed on the upper surface of the base. A connecting block is fixedly connected to the bottom surface of the support frame. The surface of the connecting block is inserted into the inner wall of the connecting groove. Connecting frames are fixedly connected to both sides of the bottom end of the support frame. A rotating plate is rotatably connected to the inner wall of the connecting frame. A through hole is formed on the surface of the rotating plate. Connecting plates are fixedly connected to both sides of the base. The surface of the connecting plate is inserted into the inner wall of the through hole. A mounting shaft is threaded through one side surface of the rotating plate. The arc surface of the mounting shaft slides through the surface of the connecting plate.

[0007] The aforementioned components achieve the following effects: by incorporating an adjustment device, the support frame can be inserted and installed via the connecting block and the connecting slot on the base, and quick connection and fixation are achieved through the cooperation of the rotating plate, connecting plate, and mounting shaft. This structure facilitates the assembly and disassembly of the support frame and the initial adjustment of its height or angle, thereby adapting to different specifications of processed parts or different marking process requirements, improving the equipment's versatility and ease of adjustment.

[0008] Preferably, both ends of the inner wall of the connecting frame are fitted with coil springs, and the two ends of the coil springs are fixedly connected to the rotating plate and the connecting frame, respectively.

[0009] The effect achieved by the aforementioned components is as follows: by incorporating a coil spring, an automatic reset torque is provided to the rotating plate when the mounting shaft is released, causing the rotating plate to tend to disengage from the locking state of the connecting plate. This allows the operator to easily operate and reset the rotating plate with one hand, simplifying the adjustment process and improving the efficiency of disassembly, assembly, and adjustment.

[0010] Preferably, a docking plate is fixedly connected to one side of the bottom end of the support frame, a rotating block is rotatably connected to the lower surface of the docking plate, a side plate is fixedly connected to the side wall surface of the base, and a positioning hole is opened on the surface of the side plate, the cross-sectional dimensions of the positioning hole being adapted to the cross-sectional dimensions of the rotating block.

[0011] The aforementioned components achieve the following effect: by setting up an auxiliary positioning structure consisting of a docking plate, a rotating block, a side plate, and positioning holes, the rotating block can be rotated into the positioning holes of the side plate when the support frame is installed on the base. This provides the support frame with additional lateral positioning and support, enhancing the overall structural stability and vibration resistance after the support frame is connected to the base, and ensuring accuracy during the marking process.

[0012] Preferably, the base is a hard alloy base, and the cross-sectional dimensions of the base are adapted to the cross-sectional dimensions of the support frame.

[0013] The aforementioned components achieve the following effect: by using a hard alloy material for the base and ensuring its cross-sectional dimensions are compatible with the support frame, sufficient strength, rigidity, and wear resistance are guaranteed for the base. This provides a solid and reliable foundation for the entire adjustment device and the supporting structure above it, enabling it to withstand vibrations and loads during marking operations for extended periods, thus extending the device's service life.

[0014] Preferably, the auxiliary device is disposed on the surface of the supporting base plate. The auxiliary device includes an adjusting rail, the lower surface of which is fixedly connected to the surface of the supporting base plate, and the inner wall of which is slidably connected to the surface of the base. A fixing plate is fixedly connected to one side surface of the base. The fixing plate has an "L" shaped cross-section. A side hole is formed on the side wall surface of the fixing plate. The same connecting rod is fixedly connected to both ends of the inner wall of the side hole. A sliding plate is slidably connected to the arc surface of the connecting rod. A clamping plate is fixedly connected to one side of the sliding plate. The upper end of the clamping plate has a conical tooth shape. A rack is fixedly connected to one side surface of the adjusting rail. The tooth surface of the rack engages with the conical tooth surface of the clamping plate. A spring is sleeved on the arc surface of the connecting rod. The two ends of the spring are fixedly connected to the bottom end of the inner wall of the sliding plate and the side hole, respectively.

[0015] The aforementioned components achieve the following effect: by incorporating auxiliary devices, the base can slide linearly along the adjusting rail, thereby enabling horizontal position adjustment of the support frame and the entire marking mechanism. The locking plate, under spring action, remains engaged with the rack, providing multi-position locking functionality to prevent displacement due to vibration during operation. This structure allows for rapid and precise lateral adjustment of the marking station, and ensures stable locking after adjustment, enhancing the equipment's adaptability to marking different processing areas and improving operational convenience.

[0016] Preferably, the upper surface of the fixing plate is threaded with an extrusion shaft, the bottom end of the extrusion shaft is fixedly connected to an extrusion pad, and the lower surface of the extrusion pad abuts against the upper surface of the adjusting rail.

[0017] The aforementioned components achieve the following effect: by setting up the extrusion shaft and extrusion pad, when the extrusion shaft is rotated, the extrusion pad presses downward against the upper surface of the adjustment rail. This provides an additional, continuous, stepless frictional locking force for the base's position on the adjustment rail. Combined with the clamping plate-rack position locking, this forms a double locking mechanism, greatly enhancing the locking reliability of the base in any adjusted position and ensuring absolute positional stability during high-frequency marking operations.

[0018] Preferably, a plurality of scale grooves are provided on one side surface of the adjustment rail, and the length of the scale grooves is adapted to the length of the rack.

[0019] The aforementioned components achieve the following effect: by setting a scale groove on the side of the adjusting rail corresponding to the rack, a clear and intuitive position reference scale is provided for the operator. This allows for quantifiable adjustments to the lateral position of the base and marking mechanism, facilitating precise displacement control and consistency of marking positions between different products. It is particularly suitable for applications requiring repetitive positioning or batch processing, improving processing accuracy and efficiency.

[0020] Compared with related technologies, the laser engraving machine rotary marking device provided by this utility model has the following beneficial effects: This utility model provides a rotary marking device for a laser engraving machine. Through the operation of the adjustment device, it achieves rapid assembly and disassembly of the marking mechanism, convenient initial height adjustment, and enhanced connection stability. Utilizing the plug-in fit between the connecting block and the connecting groove, combined with a rotary locking mechanism consisting of a rotating plate, a connecting plate, and a mounting shaft, it enables rapid installation and disassembly between the support frame and the base, greatly improving maintenance and changeover efficiency. The coil spring provides automatic reset force to the rotating plate, making disassembly operations more effortless and convenient. Simultaneously, through the cooperation of the docking plate, the rotating block, and the side plate positioning holes, auxiliary lateral positioning and support are added beyond the core connection, effectively suppressing vibration and shaking during the marking process, significantly improving the rigidity of the entire actuator, and providing a fundamental guarantee for marking accuracy.

[0021] By operating the auxiliary device, the marking mechanism achieves stepless precision adjustment in the horizontal direction, reliable anti-slip locking, and accurate repeatable positioning. The base can slide along the adjustment rail fixed to the support plate, realizing smooth lateral movement of the marking station. The clamping plate automatically engages with the rack under the action of the spring, providing discrete gear locking and anti-accidental movement functions. Combined with the scale groove on the side of the adjustment rail, the adjustment distance can be quantified and repeated, facilitating batch processing. The rotating extrusion shaft drives the extrusion pad to forcefully press the adjustment rail, generating a huge frictional locking force. Together with the clamping plate-rack mechanism, it forms a double locking mechanism, ensuring that the marking mechanism will not experience any micron-level displacement under high-frequency dynamic workload, fundamentally solving the problems of easy loosening and poor precision retention in traditional methods. Attached Figure Description

[0022] Figure 1 A schematic diagram of the structure of a rotating marking device for a laser engraving machine provided by this utility model; Figure 2 for Figure 1 The diagram shows the structure of the regulating device. Figure 3 for Figure 1 The diagram shows the structure of the auxiliary device. Figure 4 for Figure 1 The enlarged structural diagram at point A is shown.

[0023] The following are the labeling elements in the diagram: 1. Support base plate; 2. Support frame; 3. Rotating arm; 4. Adjusting device; 401. Base; 402. Connecting groove; 403. Connecting block; 404. Connecting frame; 405. Rotating plate; 406. Coil spring; 407. Through hole; 408. Mounting shaft; 409. Connecting plate; 410. Side plate; 411. Positioning hole; 412. Butt plate; 413. Rotating block; 5. Auxiliary device; 501. Fixing plate; 502. Extrusion shaft; 503. Extrusion pad; 504. Side hole; 505. Connecting rod; 506. Slide plate; 507. Spring; 508. Adjusting rail; 509. Scale groove; 510. Rack; 511. Clamping plate; 6. Cylinder; 7. Drive synchronous pulley; 8. Marking gripper; 9. Processed part. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0026] Please see Figures 1 to 4 The present invention provides a rotating marking device for a laser engraving machine, comprising: a supporting base plate 1 and a supporting frame 2. The supporting base plate 1 is provided at the upper end of the supporting frame 2. A cylinder 6 is fixedly connected to the upper surface of the supporting base plate 1. A rotating arm 3 is installed at the output end of the cylinder 6. A drive synchronous wheel 7 is provided at one end of the rotating arm 3. A marking gripper 8 is installed at the bottom end of the drive synchronous wheel 7. A processing part 9 is provided on the surface of the marking gripper 8. An adjustment device 4 is provided at the end of the supporting frame 2 and the supporting base plate 1 that are close to each other. An auxiliary device 5 is provided on the surface of the supporting base plate 1.

[0027] In the embodiments of this utility model, please refer to Figure 2 and Figure 4 The adjusting device 4 includes a base 401, which is fixedly connected to the surface of the supporting base plate 1 by means of an auxiliary device 5. A connecting groove 402 is provided on the upper surface of the base 401. A connecting block 403 is fixedly connected to the bottom surface of the support frame 2. The surface of the connecting block 403 is inserted into the inner wall of the connecting groove 402. Connecting frames 404 are fixedly connected to both sides of the bottom end of the support frame 2. A rotating plate 405 is rotatably connected to the inner wall of the connecting frame 404. A through hole 407 is provided on the surface of the rotating plate 405. Connecting plates 409 are fixedly connected to both sides of the base 401. The surface of the connecting plate 409 is inserted into the inner wall of the through hole 407. A threaded hole is threaded through one side of the rotating plate 405. There is a mounting shaft 408, the arc surface of the mounting shaft 408 slides through the surface of the connecting plate 409, both ends of the inner wall of the connecting frame 404 are fitted with coil springs 406, the two ends of the coil springs 406 are fixedly connected to the rotating plate 405 and the connecting frame 404 respectively, a docking plate 412 is fixedly connected to one side of the bottom end of the support frame 2, a rotating block 413 is rotatably connected to the lower surface of the docking plate 412, a side plate 410 is fixedly connected to the side wall surface of the base 401, a positioning hole 411 is opened on the surface of the side plate 410, the cross-sectional dimensions of the positioning hole 411 are adapted to the cross-sectional dimensions of the rotating block 413, the base 401 is a hard alloy base, and the cross-sectional dimensions of the base 401 are adapted to the cross-sectional dimensions of the support frame 2; In the embodiments of this utility model, please refer to Figure 3The auxiliary device 5 includes an adjusting rail 508, the lower surface of which is fixedly connected to the surface of the supporting base plate 1. The inner wall of the adjusting rail 508 is slidably connected to the surface of the base 401. A fixing plate 501 is fixedly connected to one side surface of the base 401. The fixing plate 501 has an "L"-shaped cross-section. A side hole 504 is opened on the side wall surface of the fixing plate 501. The same connecting rod 505 is fixedly connected to both ends of the inner wall of the side hole 504. A sliding plate 506 is slidably connected to the arc surface of the connecting rod 505. A clamping plate 511 is fixedly connected to one side of the sliding plate 506. The upper end of the clamping plate 511 has a conical tooth cross-section. A rack 510 is fixedly connected to one side surface. The tooth surface of the rack 510 engages with the conical tooth surface of the clamping plate 511. A spring 507 is sleeved on the arc surface of the connecting rod 505. The two ends of the spring 507 are fixedly connected to the bottom of the inner wall of the slide plate 506 and the side hole 504, respectively. A pressing shaft 502 is threaded through the upper surface of the fixing plate 501. A pressing pad 503 is fixedly connected to the bottom of the pressing shaft 502. The lower surface of the pressing pad 503 abuts against the upper surface of the adjusting rail 508. Several scale grooves 509 are opened on one side surface of the adjusting rail 508. The length of the scale grooves 509 is adapted to the length of the rack 510. The working principle of the laser engraving machine rotary marking device provided by this utility model is as follows: The laser engraving machine rotary marking device realizes multi-dimensional rapid adjustment and firm locking of the marking mechanism through the adjustment device 4, and realizes horizontal precision displacement and fixation of the marking mechanism through the auxiliary device 5, thereby greatly enhancing the adaptability of the equipment to different workpieces and different marking positions, the ease of operation and the processing accuracy. Cylinder 6 acts as the drive source, its output end pushing or pulling the rotating arm 3. The drive synchronous wheel 7 at one end of the rotating arm 3 moves accordingly, driving the marking gripper 8 connected to it and the workpiece 9 it holds to rotate precisely. With the cooperation of the laser head of the external laser engraving machine, when the workpiece 9 is rotated to a preset angle, the laser beam etches and marks the surface of the workpiece. By controlling the stroke and speed of cylinder 6, the rotation angle and positioning of the workpiece can be controlled to achieve marking on the circumferential surface or at a specific angle. During this process, the position of the support frame 2 can be easily installed, disassembled, or initially adjusted with the help of the adjustment device 4. The connecting block 403 at the bottom of the support frame 2 is aligned with the connecting groove 402 on the base 401 and inserted to complete the initial positioning. Meanwhile, the rotating plates 405 on the connecting frames 404 on both sides of the support frame 2, with their through holes 407, will naturally fit onto the connecting plates 409 on both sides of the base 401. By manually rotating the mounting shaft 408 on the rotating plate 405, its threaded portion advances, the shaft passes through the connecting plate 409 and applies pressure, thereby fastening the rotating plate 405, the connecting plate 409, and the side wall of the base 401 sandwiched in the middle together, achieving a rigid connection between the support frame 2 and the base 401. When disassembly or adjustment is required, the mounting shaft 408 is loosened. At this time, the coil spring 406 comes into play. The torque stored in the coil spring 406 will drive the rotating plate 405 to automatically rotate an angle in the loosening direction, so that the rotating plate 405 and the connecting plate 409 are disengaged, making it easy for the operator to lift the support frame 2 together with the rotating plate 405, so that the connecting block 403 is disengaged from the connecting groove 402. By selecting connecting grooves 402 of different depths, the initial height of the support frame 2 can be coarsely adjusted during installation. During installation, once the support frame 2 is in place, the rotating block 413 under the docking plate 412 can be manually screwed into the positioning hole 411 of the side plate 410 of the base 401. This provides an additional lateral support point for the support frame 2, forming a multi-point fixation with the connecting groove 402, significantly enhancing the anti-shaking and anti-torsion capabilities of the entire vertical structure and ensuring the stability of the mechanism during marking. The entire base 401, along with the adjusting device 4 and the support frame 2 on it, is mounted on the adjusting rail 508 and can slide along the inner wall of the adjusting rail 508. By pushing the base 401 or the support frame 2, the entire marking head assembly can be moved smoothly in the horizontal direction to align with different marking areas on the workpiece. When it is in place, under the continuous thrust of the spring 507, the sliding plate 506 drives the clamping plate 511 to tightly engage its conical tooth surface into the tooth groove of the rack 510 on the side of the adjusting rail 508. This design enables multi-position positioning, preventing the base 401 from sliding under equipment vibration or accidental stress. After the clamping plate 511 completes the initial position locking, the compression shaft 502 is rotated, causing the compression pad 503 at its bottom to forcefully press down on the upper surface of the adjusting rail 508. The enormous downward pressure generated by the threads creates a large static friction force between the compression pad 503 and the adjusting rail 508. This friction force, combined with the clamping force of the clamping plate 511, forms a double locking mechanism, ensuring that the base 401 will not experience any slight displacement during high-speed, high-frequency marking operations, thus guaranteeing absolute accuracy in the marking position.

[0028] The circuits and controls involved in this utility model are all existing technologies and will not be described in detail here.

[0029] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A rotary marking device for a laser engraving machine, characterized in that, include: A support base plate (1) and a support frame (2) are provided. The support base plate (1) is provided on the upper end of the support frame (2). A cylinder (6) is fixedly connected to the upper surface of the support base plate (1). A rotating arm (3) is installed at the output end of the cylinder (6). A drive synchronous wheel (7) is provided at one end of the rotating arm (3). A marking gripper (8) is installed at the bottom end of the drive synchronous wheel (7). A workpiece (9) is provided on the surface of the marking gripper (8). An adjustment device (4) is provided at the end of the support frame (2) and the support base plate (1) that are close to each other. The adjustment device (4) includes a base (401). The base (401) is fixedly connected to the surface of the support base plate (1) by means of an auxiliary device (5). A connecting groove is provided on the upper surface of the base (401). (402), a connecting block (403) is fixedly connected to the bottom surface of the support frame (2), the surface of the connecting block (403) is inserted into the inner wall of the connecting groove (402), a connecting frame (404) is fixedly connected to both sides of the bottom end of the support frame (2), a rotating plate (405) is rotatably connected to the inner wall of the connecting frame (404), a through hole (407) is opened on the surface of the rotating plate (405), a connecting plate (409) is fixedly connected to both sides of the base (401), the surface of the connecting plate (409) is inserted into the inner wall of the through hole (407), a mounting shaft (408) is threaded through one side surface of the rotating plate (405), and the arc surface of the mounting shaft (408) slides through the surface of the connecting plate (409).

2. The laser engraving machine rotary marking device according to claim 1, characterized in that, Both ends of the inner wall of the connecting frame (404) are fitted with coil springs (406), and the two ends of the coil springs (406) are fixedly connected to the rotating plate (405) and the connecting frame (404) respectively.

3. The laser engraving machine rotary marking device according to claim 1, characterized in that, A docking plate (412) is fixedly connected to one side of the bottom end of the support frame (2). A rotating block (413) is rotatably connected to the lower surface of the docking plate (412). A side plate (410) is fixedly connected to the side wall surface of the base (401). A positioning hole (411) is provided on the surface of the side plate (410). The cross-sectional dimensions of the positioning hole (411) are adapted to the cross-sectional dimensions of the rotating block (413).

4. The laser engraving machine rotary marking device according to claim 1, characterized in that, The base (401) is a hard alloy base, and the cross-sectional dimensions of the base (401) are adapted to the cross-sectional dimensions of the support frame (2).

5. The laser engraving machine rotary marking device according to claim 1, characterized in that, The auxiliary device (5) is disposed on the surface of the supporting base plate (1). The auxiliary device (5) includes an adjusting rail (508). The lower surface of the adjusting rail (508) is fixedly connected to the surface of the supporting base plate (1). The inner wall of the adjusting rail (508) is slidably connected to the surface of the base (401). A fixing plate (501) is fixedly connected to one side surface of the base (401). The cross-section of the fixing plate (501) is "L" shaped. A side hole (504) is opened on the side wall surface of the fixing plate (501). The two ends of the inner wall of the side hole (504) are fixedly connected to the same connecting rod. The connecting rod (505) has a sliding plate (506) slidably connected to its arc surface. A clamping plate (511) is fixedly connected to one side of the sliding plate (506). The upper end of the clamping plate (511) has a conical tooth shape. A rack (510) is fixedly connected to one side surface of the adjusting rail (508). The tooth surface of the rack (510) engages with the conical tooth surface of the clamping plate (511). A spring (507) is sleeved on the arc surface of the connecting rod (505). The two ends of the spring (507) are fixedly connected to the sliding plate (506) and the bottom of the inner wall of the side hole (504), respectively.

6. The laser engraving machine rotary marking device according to claim 5, characterized in that, The upper surface of the fixed plate (501) is threaded with an extrusion shaft (502), and the bottom end of the extrusion shaft (502) is fixedly connected with an extrusion pad (503). The lower surface of the extrusion pad (503) abuts against the upper surface of the adjustment rail (508).

7. A laser engraving machine rotary marking device according to claim 5, characterized in that, The adjustment rail (508) has several scale grooves (509) on one side surface, and the length of the scale grooves (509) is adapted to the length of the rack (510).

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