Printing ink screen printing device for display screen cover plate

Abstract

The utility model discloses an ink screen printing device for a display screen cover plate, which relates to the field of screen printing of cover plates and comprises a rack, a reciprocating translation mechanism is arranged at the top of the rack and comprises a translation plate and a driving structure, two bearing plates are arranged on the translation plate, a screen printing component is arranged on one side of the rack, and the screen printing component is arranged on the other side of the rack. The reciprocating translation mechanism is arranged on the rack, detection devices are arranged at the two ends of the reciprocating translation mechanism, the driving structure drives the translation plate to reciprocate, when screen printing is conducted on the cover plate on one bearing plate on the translation plate, the detection devices detect the cover plate on the other bearing plate, and a touch display screen is arranged on the front side of the rack. According to the utility model, screen printing and detection can be carried out synchronously, whether printing ink screen printing on a cover plate is qualified or not can be found in time, the printing ink viscosity and the position of a screen printing assembly can be adjusted in time, the output of unqualified products is reduced, material waste is avoided, the manufacturing cost is saved, the quality stability and yield of products are improved, and the working efficiency is greatly improved; the production progress is accelerated.

Description

Technical Field

[0001] The utility model relates to the technical field of cover plate screen printing, in particular to an ink screen printing device for a display screen cover plate. Background Technique

[0002] When processing a display screen cover plate, it is necessary to screen-print black ink in the non-display area and semi-transparent ink in the display area to meet the usage requirements of electronic devices. Most display screen cover plates are glass plates, and an ink screen printing machine is used to screen-print the ink onto the cover plate. Patent Application No. CN202122497993.6 discloses an automatic ink printing machine for an OLED cover plate, which includes a loading module, an unloading module, a screen printing bracket, and a cover plate support module for placing an OLED cover plate composed of multiple OLED chips arranged. The loading module and the unloading module are respectively arranged outside the left and right ends of the cover plate support module. The screen printing bracket makes a reciprocating motion in the up and down direction through a cylinder device. A screen printing stencil fixedly connected thereto and an ink-loading robotic arm movably connected thereto are provided on the screen printing bracket. The ink-loading robotic arm makes a reciprocating motion along the length direction of the screen printing stencil through a translation driving device; the loading module and the unloading module can improve the loading and unloading efficiency of the printing machine, and the cooperation of the ink-loading robotic arm, the screen printing stencil, and the cover plate support module enables the printing machine to perform the ink coating process on multiple OLED chips at the same time. During screen printing, since the screen printing ink needs to be stirred evenly in advance, and over time, the viscosity of the ink will change. Sometimes equipment failures, shutdowns, or rest times will affect the viscosity of the screen printing ink, which is likely to cause uneven thickness of the screen printing ink. Especially when screen-printing semi-transparent ink, the thickness will affect the transmittance of the ink, resulting in defective products. Generally, ordinary screen printing machines do not have the function of self-testing the ink thickness or the transmittance.

[0003] The patent application number CN202020638587.X discloses a glass cover plate screen printing ink detection device, which includes an area array camera, a rotating mechanism, a glass cover plate stage and a moving mechanism; the area array camera is used to detect the glass cover plate; and the area array camera is fixed on the moving mechanism; the glass cover plate stage is used to fix the glass cover plate, and the glass cover plate stage is installed on the rotating mechanism; the rotating mechanism is used to drive the glass cover plate stage to rotate, and the rotating mechanism includes a connecting part and a driving part. The moving mechanism is used to move the area array camera, and the moving mechanism is located above the glass cover plate stage. Through the cooperation of the rotating mechanism, the limiting mechanism and the moving mechanism in this detection device, the glass cover plate can be detected in all directions. However, this detection method is set separately from the screen printing equipment. After each screen printing is completed, the cover plate needs to be placed on the carrier again for detection. This detection method can only judge whether the screen printing of the glass cover plate is qualified, and cannot timely detect whether the thickness of the ink screen printing is qualified. If the screen printing ink is unqualified due to reasons such as high viscosity, it will cause the screen printing quality of a batch of cover plates to be unqualified, resulting in waste of materials, increased processing costs, and affecting the production progress of the cover plate.

[0004] Therefore, the present utility model discloses a display screen cover plate ink screen printing device to solve the above problems. Utility Model Content

[0005] Based on this, in order to solve the above technical problems, it is necessary to provide a display screen cover plate ink screen printing device. By driving the translation plate by a driving mechanism, when one cover plate on the translation plate is screen printed, the other cover plate is detected, so as to achieve simultaneous screen printing and detection, be able to timely detect whether the ink screen printing on the cover plate is qualified, timely adjust the ink viscosity and the position of the screen printing component, reduce the production quantity of unqualified products, avoid waste of materials, save manufacturing costs, improve the quality stability and yield rate of the cover plate, greatly improve the work efficiency, and speed up the production progress.

[0006] In order to solve the above technical problems, the present utility model adopts the following technical solutions:

[0007] A display screen cover plate ink screen printing device includes a frame. A reciprocating translation mechanism is provided at the top of the frame. The reciprocating translation mechanism includes a translation plate and a driving structure. Two carrier plates are provided on the translation plate. A screen printing component is provided on one side of the frame, and detection devices are provided at both ends of the reciprocating translation mechanism. The driving structure drives the translation plate to reciprocate. When the cover plate on one carrier plate on the translation plate is screen printed, the detection device detects the cover plate on the other carrier plate. A touch display screen is provided on the front side of the frame.

[0008] As a preferred embodiment of the screen cover ink screen printing device provided by the present utility model, the reciprocating translation mechanism further includes a support frame, a top plate is fixedly connected to the support frame, a strip groove is provided on the top plate along the translation direction of the translation plate, and the driving structure is arranged inside the support frame.

[0009] As a preferred embodiment of the screen cover ink screen printing device provided by the present utility model, the driving structure includes a sliding frame, guide rails, a driving lead screw and a motor. Two guide rails are provided and both ends are fixedly connected to the support frame. Sliders are provided at the bottom of the sliding frame. The sliders are slidably connected to the guide rails and the driving lead screw is threadedly connected to the sliders. One end of the driving lead screw is drivingly connected to the motor. A vertical block passing through the strip groove is provided on the sliding frame, and the vertical block is fixedly connected to the translation plate.

[0010] As a preferred embodiment of the screen cover ink screen printing device provided by the present utility model, a placement groove is provided on the bearing plate, through grooves are provided at the bottom of the placement groove and at the relative position of the translation plate, handles are provided on both sides of the bearing plate, and positioning members are provided on the translation plate.

[0011] As a preferred embodiment of the screen cover ink screen printing device provided by the present utility model, the detection device is a transmittance testing device.

[0012] As a preferred embodiment of the screen cover ink screen printing device provided by the present utility model, the transmittance testing device includes an L-shaped frame, a transmitter and a receiver. The transmitter is fixed on the L-shaped frame. The receiver is arranged directly below the transmitter, and the bearing plate on the translation plate is located between the receiver and the transmitter. Both the transmitter and the receiver are connected to the controller.

[0013] As a preferred embodiment of the screen cover ink screen printing device provided by the present utility model, a proximity sensor is installed on the L-shaped frame.

[0014] As a preferred embodiment of the screen cover ink screen printing device provided by the present utility model, an alarm is installed on the L-shaped frame.

[0015] As a preferred embodiment of the screen cover ink screen printing device provided by the present utility model, the screen printing assembly includes a vertical frame, a horizontal frame, a squeegee group and a screen printing stencil. The horizontal frame is installed on the vertical frame. A sliding frame driven by a screw is slidably connected to the horizontal frame. The squeegee group is installed vertically and movably on the sliding frame. The screen printing stencil is located below the squeegee group.

[0016] As a preferred embodiment of the screen cover ink screen printing device provided by the present utility model, brackets are fixedly connected to both ends of the cross frame. Two optical rods are slidably connected to the brackets. A cross bar is fixedly connected between the optical rods. A clamping member is fixedly connected to the lower end of the optical rod. The screen printing stencil is fixed between the two clamping members. A lifting cylinder is installed on the bracket, and the telescopic shaft of the lifting cylinder is fixedly connected to the cross bar.

[0017] Compared with the prior art, the present utility model has the following beneficial effects: The screen cover ink screen printing device provided by the present utility model drives the translation plate through the driving mechanism, so that when one cover plate is screen printed on the translation plate, the other cover plate is detected, achieving synchronous screen printing and detection, being able to timely discover whether the ink screen printing on the cover plate is qualified, timely adjust the ink viscosity and the position of the screen printing assembly, reduce the production quantity of unqualified products, avoid material waste, save manufacturing costs, improve the quality stability and yield rate of the product, greatly improve the work efficiency, and accelerate the production progress. Description of the Drawings

[0018] In order to more clearly illustrate the solutions in the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the following-described drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the screen cover ink screen printing device provided by the present utility model;

[0020] Figure 2 It is a three-dimensional schematic diagram of one perspective of the reciprocating translation mechanism of the screen cover ink screen printing device provided by the present utility model;

[0021] Figure 3 It is a three-dimensional schematic diagram of another perspective of the reciprocating translation mechanism of the screen cover ink screen printing device provided by the present utility model;

[0022] Figure 4 It is a three-dimensional schematic diagram of the driving structure in the reciprocating translation mechanism of the screen cover ink screen printing device provided by the present utility model;

[0023] Figure 5 It is a three-dimensional structural schematic diagram of the carrier plate of the screen cover ink screen printing device provided by the present utility model;

[0024] Figure 6 It is a three-dimensional schematic diagram of the screen printing assembly of the screen cover ink screen printing device provided by the present utility model.

[0025] The markings in the figures are explained as follows:

[0026] 1. Frame; 2. Reciprocating translation mechanism; 21. Translation plate; 22. Driving structure; 221. Sliding frame; 222. Guide rail; 223. Driving lead screw; 224. Motor; 225. Vertical block; 226. Slide block; 23. Support frame; 24. Top plate; 25. Strip groove; 26. Positioning part; 3. Carrier plate; 31. Placing groove; 32. Through groove; 33. Handle; 4. Silk screen printing assembly; 41. Vertical frame; 42. Horizontal frame; 43. Blade group; 44. Silk screen printing plate; 45. Slide frame; 46. Support; 47. Smooth rod; 48. Horizontal bar; 49. Clamping part; 410. Lifting cylinder; 5. Detection equipment; 51. L-shaped frame; 52. Transmitter; 53. Receiver; 54. Alarm; 55. Proximity sensor; 6. Touch display screen. Detailed implementation manner

[0027] In order to enable those skilled in the art of this technology to better understand the solution of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model, rather than all of the embodiments. Based on the embodiments in this utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of this utility model.

[0028] As described in the background art, during silk screen printing, since the silk screen printing ink needs to be stirred evenly in advance, and over time, the viscosity of the ink will change. Sometimes equipment failures, shutdowns, or rest times will affect the viscosity of the silk screen printing ink, which can easily lead to uneven thickness of the silk screen printing ink. Especially when printing semi-transparent ink, the thickness will affect the transmittance of the ink, resulting in defective products. Generally, silk screen printing machines neither have the function of testing the thickness of the ink nor the function of testing the transmittance. The existing detection method is separately set from the silk screen printing equipment. After each silk screen printing is completed, the cover plate needs to be placed on the carrier table again for detection. This detection method can only determine whether the silk screen printing of the glass cover plate is qualified, and cannot timely detect whether the thickness of the ink silk screen printing is qualified. If the silk screen printing ink is unqualified due to reasons such as high viscosity, it will cause the silk screen printing quality of a batch of cover plates to be unqualified, resulting in waste of materials, increased processing costs, and affecting the production progress of the cover plates.

[0029] To solve this technical problem, this utility model provides a display screen cover plate ink silk screen printing device, which is applied to the field of cover plate silk screen printing.

[0030] Specifically, please refer to Figures 1-6, the ink screen printing device for the display screen cover plate specifically includes a frame 1. A reciprocating translation mechanism 2 is provided on the top of the frame 1. The reciprocating translation mechanism 2 includes a translation plate 21 and a driving structure 22. Two bearing plates 3 are provided on the translation plate 21. A screen printing assembly 4 is provided on one side of the frame 1. Detection devices 5 are provided at both ends of the reciprocating translation mechanism 2. The driving structure 22 drives the translation plate 21 to reciprocate. When the cover plate on one bearing plate 3 on the translation plate 21 is screen printed, the detection device 5 detects the cover plate on the other bearing plate 3. A touch display screen 6 is provided on the front side of the frame 1.

[0031] The ink screen printing device for the display screen cover plate provided by the present utility model drives the translation plate 21 through a driving mechanism, so that when one of the cover plates on the translation plate 21 is screen printed, the other cover plate is detected, achieving synchronous screen printing and detection, being able to timely detect whether the ink screen printing on the cover plate is qualified, timely adjust the ink viscosity and the position of the screen printing assembly 4, reduce the production quantity of unqualified products, avoid material waste, save manufacturing costs, improve the quality stability and yield rate of products, greatly improve work efficiency, and accelerate the production progress.

[0032] In order to enable those skilled in the art to better understand the solution of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0033] It should be noted that, without conflict, the embodiments in the present utility model and the features and technical solutions in the embodiments can be combined with each other.

[0034] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0035] Embodiment 1

[0036] Please refer to Figures 1-5 , a kind of ink screen printing device for the display screen cover plate is provided, which includes a frame 1. A reciprocating translation mechanism 2 is provided on the top of the frame 1. The reciprocating translation mechanism 2 includes a translation plate 21 and a driving structure 22. Two bearing plates 3 are provided on the translation plate 21. The bearing plates 3 are used to place the cover plates to be screen printed. A screen printing assembly 4 is provided on one side of the frame 1. Detection devices 5 are provided at both ends of the reciprocating translation mechanism 2. The driving structure 22 drives the translation plate 21 to reciprocate. When the cover plate on one bearing plate 3 on the translation plate 21 is screen printed, the detection device 5 detects the cover plate on the other bearing plate 3. A touch display screen 6 is provided on the front side of the frame 1. The touch display screen 6 is used to control device components and display detection results. The detection device 5 can be a area array camera or a transmittance test device to detect the screen printed panel.

[0037] As shown Figure 6 in the figure, the screen printing assembly 4 includes a vertical frame 41, a horizontal frame 42, a squeegee group 43 and a screen printing stencil 44. The horizontal frame 42 is installed on the vertical frame 41 and can slide in the vertical direction of the vertical frame 41 to adjust the height. The height of the horizontal frame 42 can be adjusted by manual rotation. A carriage 45 driven by a screw is slidably connected to the horizontal frame 42. The screw is connected to the driving motor 224 to drive the carriage 45 to slide left and right. The squeegee group 43 is installed on the carriage 45 in a lifting manner. The screen printing stencil 44 is located below the squeegee group 43. The squeegee group 43 includes a rubber squeegee and a squeegee and is arranged in a lifting manner. This part is the existing conventional technology and will not be described separately here. At both ends of the horizontal frame 42, there are fixedly connected brackets 46. Two optical rods 47 are slidably connected to the brackets 46. A cross bar 48 is fixedly connected between the optical rods 47. The lower ends of the optical rods 47 are fixedly connected with clamping members 49. The screen printing stencil 44 is fixed between the two clamping members 49. A lifting cylinder 410 is installed on the bracket 46. The telescopic rod of the lifting cylinder 410 is fixedly connected with the cross bar 48, and the position of the screen printing stencil 44 in the vertical direction can be adjusted.

[0038] Embodiment 2

[0039] The display screen cover ink screen printing device provided in Embodiment 1 is further optimized. As Figures 2-5 shown in the figure, specifically, the reciprocating translation mechanism 2 further includes a support frame 23. The support frame 23 is fixed to the top of the machine frame 1. A top plate 24 is fixedly connected to the support frame 23. A strip groove 25 is provided on the top plate 24 along the translation direction of the translation plate 21. The driving structure 22 is arranged in the support frame 23. The driving structure 22 includes a sliding frame 221, guide rails 222, a driving lead screw 223 and a motor 224. There are two guide rails 222, and both ends are fixedly connected to the support frame 23. A slider 226 is provided at the bottom of the sliding frame 221. The slider 226 is slidably connected to the guide rail 222 and the driving lead screw 223 is threadedly connected to the slider 226. One end of the driving lead screw 223 is drivingly connected to the motor 224. A vertical block 225 passing through the strip groove 25 is provided on the sliding frame 221. The vertical block 225 is fixedly connected to the translation plate 21. The motor 224 drives the driving lead screw 223 to rotate. The driving lead screw 223 drives the slider 226 to slide along the guide rail 222. The translation plate 21 is driven to move left and right through the sliding frame 221, so that the two carrier plates 3 on the translation plate 21 are located below the screen printing stencil 44, achieving the purpose of screen printing the cover plate.

[0040] As Figure 2 、 5As shown in the figure, a placement groove 31 is provided on the carrier plate 3. The planar dimension of the placement groove 31 is the same as the dimension of the cover plate, and the depth of the placement groove 31 is less than the thickness of the cover plate. A through groove 32 is provided at the relative positions of the bottom of the placement groove 31 and the translation plate 21. The setting of the through groove 32 facilitates the detection of the transmittance of the cover plate. Handles 33 are provided on both sides of the carrier plate 3. A positioning member 26 is provided on the translation plate 21. The positioning member 26 is a right-angle block and is provided at the corner of the carrier plate 3 for positioning the position of the carrier plate 3. The setting of the handle 33 facilitates the removal of the carrier plate 3.

[0041] Embodiment 3

[0042] The display screen cover plate ink screen printing device provided in Embodiment 2 is further optimized as follows Figure 2 As shown in the figure, specifically, the detection device 5 is a transmittance test device. The transmittance test device includes an L-frame 51, a transmitter 52, and a receiver 53. The transmitter 52 is fixed on the L-frame 51, and the receiver 53 is arranged directly below the transmitter 52. The carrier plate 3 on the translation plate 21 is located between the receiver 53 and the transmitter 52. Both the transmitter 52 and the receiver 53 are connected to the controller. The transmitter 52 is a light source component, such as an infrared light source, a visible light source, an ultraviolet light source, etc., and is used to irradiate the screen printing ink layer of the cover plate. In order to ensure transmittance, the ink is a semi-transparent ink, and the cover plate is a glass plate. The receiver 53 is a detector, which is used to receive the light passing through the glass plate and the ink and convert it into an electrical signal, and transmit it to the controller. The controller performs signal analysis to determine whether the screen printing ink layer is qualified. And an alarm 54 is installed on the L-frame 51. The alarm 54 is an audible and visual alarm for reminding the staff of unqualified cover plates. At the same time, a proximity sensor 55 is installed inside the L-frame 51. After the proximity sensor 55 detects the translation plate 21, it sends the received signal to the controller, and the controller controls the start and stop of the motor 224.

[0043] The working principle of the display screen cover plate ink screen printing device provided by the present utility model: Place two cover plates on the carrier plate 3 respectively, position the carrier plate 3 on the translation plate 21, adjust the height position of the screen printing assembly 4, start the motor 224, the motor 224 drives the lead screw to rotate, and then drives the translation plate 21 on the sliding frame 221 to move left and right reciprocally. When one of the cover plates on the translation plate 21 is screen printed, the other cover plate is detected, achieving synchronous screen printing and detection. After the detection is completed, the carrier plate 3 is removed, and at the same time, a new carrier plate 3 containing cover plates is placed, and the other one is detected, and the newly placed cover plate is screen printed. By repeating such operations, single-person control operation can be realized, the qualification of the ink screen printing on the cover plate can be detected in time, the viscosity of the ink and the position of the screen printing assembly 4 can be adjusted in time, the production volume of unqualified products can be reduced, material waste can be avoided, the manufacturing cost can be saved, the quality stability and yield of the product are improved, the work efficiency is greatly improved, and the production progress is accelerated.

[0044] In the present utility model, unless otherwise clearly stipulated and defined, terms such as "installation", "connection", "linkage", "fixation", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral one; it may be a mechanical connection, an electrical connection, or communication with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0045] Obviously, the embodiments described above are only a part of the embodiments of the present utility model, rather than all of them. The drawings show the preferred embodiments of the present utility model, but do not limit the patent scope of the present utility model. The present utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosed content of the present utility model more thorough and comprehensive. Although the present utility model has been described in detail with reference to the foregoing embodiments, for those skilled in the art, they can still modify the technical solutions described in the foregoing specific embodiments, or perform equivalent replacements on some of the technical features. Any equivalent structures directly or indirectly using the content of the specification and drawings of the present utility model in other related technical fields are equally within the scope of the patent protection of the present utility model.

Claims

1. An ink screen printing device for a display screen cover plate, which comprises a frame, and is characterized in that, A reciprocating translation mechanism is provided at the top of the frame. The reciprocating translation mechanism includes a translation plate and a driving structure. Two bearing plates are provided on the translation plate. A screen printing assembly is provided on one side of the frame, and detection devices are provided at both ends of the reciprocating translation mechanism. The driving structure drives the translation plate to reciprocate. When the cover plate on one bearing plate on the translation plate is screen printed, the detection device detects the cover plate on the other bearing plate. A touch display screen is provided on the front side of the frame.

2. The screen cover ink silk printing device according to claim 1, characterized in that, The reciprocating translation mechanism further includes a support frame. A top plate is fixedly connected to the support frame. A strip groove is provided on the top plate along the translation direction of the translation plate. The driving structure is arranged inside the support frame.

3. The screen cover ink screen printing device according to claim 2, characterized in that The driving structure includes a sliding frame, guide rails, a driving lead screw, and a motor. Two guide rails are provided and are fixedly connected to the support frame at both ends. Sliders are provided at the bottom of the sliding frame. The sliders are slidably connected to the guide rails and the driving lead screw is threadedly connected to the sliders. One end of the driving lead screw is drivingly connected to the motor. A vertical block passing through the strip groove is provided on the sliding frame. The vertical block is fixedly connected to the translation plate.

4. The screen cover ink screen printing device according to claim 1, wherein, A placement groove is provided on the bearing plate. Through grooves are provided at the bottom of the placement groove and at the relative position of the translation plate. Handles are provided on both sides of the bearing plate. Positioning members are provided on the translation plate.

5. The screen cover ink silk printing device according to claim 1, characterized in that, The detection device is a transmittance testing device.

6. The screen cover ink screen printing device according to claim 5, characterized in that The transmittance testing device includes an L-shaped frame, a transmitter, and a receiver. The transmitter is fixed on the L-shaped frame. The receiver is arranged directly below the transmitter. And the bearing plate on the translation plate is located between the receiver and the transmitter. Both the transmitter and the receiver are connected to a controller.

7. The screen cover ink screen printing device according to claim 6, characterized in that, A proximity sensor is installed on the L-shaped frame.

8. The screen cover ink screen printing device according to claim 6, characterized in that, An alarm is installed on the L-shaped frame.

9. The screen cover ink screen printing device according to claim 1, characterized in that, The screen printing assembly includes a vertical frame, a horizontal frame, a squeegee group, and a screen printing stencil. The horizontal frame is installed on the vertical frame. A sliding frame driven by a screw is slidably connected to the horizontal frame. The squeegee group is installed vertically and slidably on the sliding frame. The screen printing stencil is located below the squeegee group.

10. The screen cover ink screen printing device according to claim 9, characterized in that, Supports are fixedly connected to both ends of the horizontal frame. Two optical rods are slidably connected to the supports. A cross bar is fixedly connected between the optical rods. Clamping members are fixedly connected to the lower ends of the optical rods. The screen printing stencil is fixed between the two clamping members. A lifting cylinder is installed on the support. The telescopic shaft of the lifting cylinder is fixedly connected to the cross bar.

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