Line drawing machine

Abstract

A line drawing machine at least comprises a heating device, a vacuum adsorption device and an extrusion device, the heating device is provided with a heat source, and the heat source heats sheet materials in one or more modes of direct contact, indirect contact, heat radiation and heat convection. The heat of the heat source is obtained through one or more of resistance heating, electromagnetic heating, fuel heating, heat pump heating and high-temperature gas or liquid heating; the extrusion device is a compression roller capable of rolling the sheet stock, or the extrusion device is of two planar structures and directly or indirectly extrudes the sheet stock through relative movement, so that the sheet stock becomes smoother under the action of pressure. According to the line drawing machine, uneven sheet materials can be heated through the heating device, the sheet materials are generally softened after being heated, the plasticity is enhanced, the sheet materials are extruded through the extrusion device, the sheet materials can become flat, the temperature of the sheet materials is reduced after the sheet materials are far away from the heating device, and the flat shape can be kept; and the requirements of ink-jet printing and image recognition of a visual device and a printing device can be met.

Description

Technical Field

[0001] The utility model belongs to the field of marking tools, and particularly relates to a line drawing machine. Background Art

[0002] For existing leather or textile products such as shoes, clothing, and luggage, the leather or fabric needs to be cut into various irregularly shaped pieces first and then sewn or glued together. Without markings, manual operation with position deviation will result in various shapes being spliced. Therefore, markings generally need to be made at the sewing or bending positions, that is, using a line drawing machine to make markings on the pieces by inkjet. For irregular shapes, photo recognition needs to be carried out first, and then inkjet printing starts. However, after the pieces are cut, they generally bend or warp at the edges, affecting photo recognition and subsequent line drawing markings.

[0003] The Chinese Utility Model Patent Publication No. CN213663976U discloses a line drawing pressing frame. When used on a line drawing machine, it can effectively press the pieces with warped edges and local deformation, which is beneficial to the rapid matching of the graphics after being photographed by a CCD vision camera with a template, improving the effectiveness of graphic matching, reducing the probability of matching errors and missed matches. However, this design also has many deficiencies. The silk thread will block the printing at some positions and cannot form perfect markings. Some pieces with large deformation and bending cannot be pressed flat, and the raised parts will affect the nozzle of the line drawing machine.

[0004] The Chinese Patent Publication No. "CN217407996U" with the patent name "A continuous material pressing device for an automatic line drawing machine" discloses an annular material pressing structure. This solution uses a more complex material pressing structure, which restricts the setting of other structures. Although it has made great progress compared with traditional machines, there is still room for further improvement in the efficiency if this continuous material pressing device is used in a line drawing machine. Content of the Utility Model

[0005] Aiming at the above-mentioned existing technologies, the purpose of the utility model is to provide a more reliable line drawing machine.

[0006] The technical solution of the utility model is realized as follows: A line drawing machine includes at least a heating device and an extrusion device.

[0007] The heating device is provided with a heat source, and the heat source heats the piece by one or more of the ways of direct contact, indirect contact, thermal radiation, and heat convection. The heat of the heat source is obtained by one or more of resistance heating, electromagnetic heating, fuel heating, heat pump heating, high-temperature gas or liquid heating.

[0008] The extrusion device is a pressure roller that can roll-press the piece, or the extrusion device is two planar structures that directly or indirectly extrude the piece through relative movement, making the piece flatter under the action of pressure.

[0009] The beneficial effects of such a design are as follows: The line drawing machine can heat the uneven sheet material through the heating device. After being heated, the sheet material generally becomes soft and its plasticity increases. By extruding the sheet material through the extrusion device, the sheet material can be made flat. After the sheet material moves away from the heating device, its temperature drops, and it can maintain a flat shape, which can meet the requirements of inkjet printing and image recognition of the vision device and the printing device. Compared with the prior art, the sheet material remains in a flatter state after being extruded by the extrusion device. For example, by using rolling, rapid heating can be achieved by increasing the heating temperature, which can greatly improve the working efficiency of the line drawing machine. Even when using a planar structure for extrusion, the flatness of the sheet material can be greatly improved, resulting in higher printing and recognition accuracy.

[0010] The line drawing machine further includes a feeding device, a vision device, and a printing device;

[0011] The feeding device is provided with a conveying structure capable of moving the sheet material a certain distance;

[0012] The vision device is provided with a camera capable of recognizing the image or contour of the moving or stationary sheet material;

[0013] The printing device is provided with an inkjet structure capable of printing various patterns or marking the process position lines according to the image or contour recognized by the vision device; Under the conveyance of the feeding device, the sheet material reaches the position of the vision device for image recognition and finally reaches the position of the printing device to complete the printing of the specified lines or patterns. The distance between the vision device and the printing device can be increased, so that the increase in the speed of the feeding device will not affect the printing of the marking, greatly improving the working efficiency of the printer, that is, more irregular sheet materials can be printed per unit time, and the sheet materials can be placed at any angle without the need to correct the placement position. The output of one printer is equivalent to that of three other devices under the condition of slightly higher power consumption, resulting in a significant reduction in the average production cost.

[0014] Furthermore, a heating rod is provided inside the pressure roller, so that the extrusion device and the heating device form a hot roller with a heating function. The feeding device is a conveyor belt structure directly or indirectly driven by a motor. Such a design makes the heating device and the extrusion device a simple structure design that is convenient for manufacturing. Using the hot roller to heat the sheet material can quickly convey the sheet material and improve the working efficiency of the printer.

[0015] Further, the conveyor belt structure includes a driving roller, an auxiliary roller, a supporting roller, and a conveyor belt. The driving roller and the auxiliary roller are symmetrically arranged on both sides of the conveyor belt and are close to each other to clamp the conveyor belt and drive the conveyor belt to move. The heating roller and the supporting roller are arranged on the upper and lower sides of the conveyor belt with a certain distance therebetween, so that when the sheet material and the conveyor belt move between the heating roller and the supporting roller, the heating roller can directly or indirectly extrude the sheet material. The conveyor belt needs to be driven by the driving roller. Therefore, the driving roller and the auxiliary roller must apply a certain pressure to the conveyor belt to generate frictional force to drive the conveyor belt to move. The supporting roller mainly cooperates with the heating roller to extrude the sheet material to produce a certain extrusion effect to plastically process the sheet material to make the sheet material flatter, providing suitable working conditions for the subsequent printing device and vision device to make the printing or marking position more accurate.

[0016] Further, the driving roller and the auxiliary roller are driven by a first transmission component, the heating roller and the supporting roller are driven by a second transmission component, the driving roller and the supporting roller are driven by a chain or a belt and a tensioning wheel is provided to ensure the synchronous rotation of the driving roller and the supporting roller. The feeding device is also provided with a speed sensor or a position sensor to detect the speed or displacement of the conveyor belt. In this way, the driving roller, the auxiliary roller, the supporting roller, and the heating roller can rotate synchronously. Since there is a certain time difference in the operation of the vision device and the printing device, that is, the printing device can receive the specific printing shape instruction only after the vision device recognizes the contour of the sheet material. Since the feeding speed of the feeding device may fluctuate, there will be a large error in printing the sheet material only relying on the time difference. Both the position sensor and the speed sensor obtain data information by detecting the position. During the displacement process, the sheet material is basically relatively stationary with respect to the conveyor belt. Therefore, when the displacement of the sheet material is equal to the distance between the image acquisition position of the vision device and the inkjet position of the printing device, it is the best position for inkjet. Of course, it takes a certain reaction time to acquire the image and start the inkjet. These times are finally converted into the displacement of the sheet material, and inkjet marking can be performed at an accurate position. Moreover, this process is continuous, and the sheet material can move at a high speed, acquire image information during the movement, and complete inkjet printing during the high-speed movement after obtaining the image information. Only when the feeding device is provided with an accurate position feedback structure can printing be achieved at an accurate position.

[0017] Further, the conveyor belt structure further includes a first support, a second support, a first bearing block, a second bearing block, a first adjusting spring, a second adjusting spring, a first adjusting screw, and a second adjusting screw. The first support and the second support are fixed to the frame. Both the first driving assembly and the second driving assembly are driven by gears. The driving roller is rotatably mounted on the first support. The first support is provided with a first track. The auxiliary roller is rotatably mounted on the first bearing block relative to the first bearing block. The first bearing block is slidably mounted on the first track relative to the first track. One end of the first adjusting spring abuts against the first bearing block and the other end abuts against the first adjusting screw. The first support is provided with a threaded hole so that the first adjusting screw can be installed in the threaded hole and the deformation amount of the first adjusting spring can be controlled by the installation depth of the first adjusting screw. The supporting roller is rotatably mounted on the second support. The second support is provided with a second track. The heating roller is rotatably mounted on the second bearing block relative to the second bearing block. The second bearing block is slidably mounted on the second track relative to the second track. One end of the second adjusting spring abuts against the second bearing block and the other end abuts against the second adjusting screw. The second support is provided with a threaded hole so that the second adjusting screw can be installed in the threaded hole and the deformation amount of the second adjusting spring can be controlled by the installation depth of the second adjusting screw. In this way, the pressure of the driving roller and the auxiliary roller on the conveyor belt can be conveniently controlled by the first adjusting spring, and the pressure of the heating roller and the supporting roller on the conveyor belt can be controlled by the second adjusting spring, so that the conveyor belt maintains a relatively stable tension between the driving roller and the supporting roller, thereby avoiding shrinkage or stretching of the conveyor belt during movement, affecting the judgment of the displacement size of the sheet material, and improving the accuracy of the printing or marking position.

[0018] Further, a suction cup is provided below the conveyor belt. The conveyor belt is made of a breathable material. The side of the suction cup in contact with the conveyor belt is provided with a plurality of suction holes. The suction cup is connected to a negative pressure fan through a pipeline to provide negative pressure for the suction cup so that the sheet material located on the conveyor belt will be adsorbed on the conveyor belt. The negative pressure fan can reduce the air pressure in the suction cup. The conveyor belt is located above the suction cup, and a large amount of gas will enter the suction cup from above the conveyor belt. In this way, the sheet material can be stably adsorbed on the conveyor belt by using atmospheric pressure. This can also ensure that the sheet material is flatter, facilitating the camera of the vision device to identify the shape of the sheet material and enabling the printing device to perform marking and printing more accurately at the specified position.

[0019] Further, the camera adopts a line scan camera and can quickly identify the planar contour of a moving object, so that the contour of a fast-moving object can be identified more accurately.

[0020] Further, a heating hood is provided behind the printing device and above the conveyor belt. A heating lamp or a heating rod is provided inside the heating hood, so as to accelerate the drying speed of the ink when the temperature is low, and there is no need to bake the ink when the temperature is high. Generally, the ink used in printers will disappear at high temperatures. Therefore, the temperature of the heating lamp or the heating rod needs to be strictly controlled, and the temperature inside the heating hood should be kept below 40 degrees as much as possible.

[0021] Further, the printing device is provided with an inkjet structure of multiple colors to spray patterns or lines of different colors. Since the traditional line-drawing machine prints when the sheet material is stationary, it is very difficult to achieve the printing of multiple-color marks. However, in the solution of this application, the printing nozzles are arranged linearly, and only one more row of nozzles needs to be added for printing in multiple colors, which can make the colors of the marked patterns diversified. Description of the Drawings

[0022] Figure 1 is an overall three-dimensional schematic diagram of a line-drawing machine according to Embodiment 1 of the present utility model;

[0023] Figure 2 is a three-dimensional schematic diagram of a line-drawing machine removing the housing according to Embodiment 1 of the present utility model;

[0024] Figure 3 is a side schematic diagram of a line-drawing machine removing the housing according to Embodiment 1 of the present utility model;

[0025] Figure 4 is a partial three-dimensional schematic diagram of a line-drawing machine removing the housing conveyor belt according to Embodiment 1 of the present utility model;

[0026] Figure 5 is Figure 4 an enlarged schematic diagram of part A in

[0027] Figure 6 is Figure 4 an enlarged schematic diagram of part B in

[0028] Figure 7 is a schematic diagram of the feeding device and the extrusion device of a line-drawing machine according to Embodiment 2 of the present utility model;

[0029] Figure 8 is a schematic diagram of the feeding device and the extrusion device of a line-drawing machine according to Embodiment 3 of the present utility model. Detailed Embodiments

[0030] As needed, detailed embodiments of the present utility model are disclosed herein. However, it should be understood that the disclosed embodiments are only illustrative of the present utility model, and the present utility model can be implemented in different and alternative forms. The drawings are not necessarily drawn to scale, and some features may be exaggerated or reduced to show details of specific components. Therefore, the specific structural and functional details disclosed herein should not be construed as limiting, but only as a representative basis for teaching those skilled in the art to adopt the present utility model differently. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0031] The feeding device, vision device, and printing device of the present utility model can all be set with reference to the prior art. For example, the technical solution used in Patent CN218500124U can not only draw lines but also print patterns. It is considered an infringement act for those of ordinary skill in the art to use the heating device and extrusion device of this application in devices such as line drawing machines or printers when changing the feeding device, vision device, and printing device. The line drawing machine of the present utility model is improved based on the traditional line drawing machine, replacing the traditional machine that can only draw lines individually, and is essentially the same as a printer, capable of directly printing patterns.

[0032] Such as Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 7 and Figure 8As shown in the figure, a line drawing machine includes at least a heating device 5 and an extrusion device 2. The heating device 5 is provided with a heat source, and the heat source heats the sheet material 24 by one or more of direct contact, indirect contact, thermal radiation, and thermal convection. The heat of the heat source is obtained by one or more of resistance heating, electromagnetic heating, fuel heating, heat pump heating, high-temperature gas or liquid heating. For example, if the heat source is a heating rod and the temperature is appropriate, below 150 degrees, it can directly contact the sheet material 24 to heat the sheet material 24. If the temperature of the heating rod is very high, then it cannot directly contact the sheet material and needs to indirectly contact the sheet material 24 through other structures to achieve heating. For example, the heating device 5 is arranged on the extrusion device 2 to directly achieve heating through the extrusion device 2, or the heating rod is arranged close to the sheet material position to utilize thermal radiation and thermal convection to achieve heating of the sheet material 24 without contacting the sheet material. There are many sources of heat. For resistance heating, only a resistance wire needs to be set. For electromagnetic heating, a corresponding coil needs to be set. It can heat the mandrel, and then transfer the heat to the extrusion device 2 or other ways to increase the heat transfer to the sheet material 24. Fuel heating requires setting a certain chamber to introduce air or oxygen and adding fuel to generate heat using chemical energy, and the heat can be transferred to the extrusion device 2 or other ways to transfer to the sheet material 24. Heat pump heating requires compressing air to achieve temperature increase. Of course, it can also directly use the liquid or gas heated by other structures to achieve heating of the sheet material.

[0033] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown in the figure, the extrusion device 2 is a pressure roller 8 that can roll the sheet material 24. A support roller 20 is provided below the pressure roller 8 to achieve rolling of the sheet material 24 on the conveyor belt 23. If a planar structure is provided below the conveyor belt 23 to achieve support, rolling can also be completed, but the conveying resistance of the conveyor belt 23 is relatively large. Or the extrusion device is two planar structures that directly or indirectly extrude the sheet material through relative movement, making the sheet material flatter under the action of pressure. The planar structure can move up and down through a hydraulic structure to extrude the sheet material 24.

[0034] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8As shown in the figure, the line drawing machine further includes a feeding device 1, a vision device 4, and a printing device 3; the feeding device 1 is provided with a conveying structure capable of moving the sheet material 24 a certain distance, that is, from one end of the feeding device 1 to the other end; the vision device 4 is provided with a camera capable of identifying the image or contour of the moving or stationary sheet material 24; the printing device 3 is provided with an inkjet structure capable of printing various patterns or marking process position lines according to the image or contour identified by the vision device 4; under the conveyance of the feeding device 1, the sheet material 24 reaches the position of the vision device 4 for image recognition, and finally reaches the position of the printing device 3 to complete the printing of the specified lines or patterns.

[0035] As Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 7 and Figure 8 As shown in the figure, a line drawing machine includes a heating device 5, an extrusion device 2, a feeding device 1, a vision device 4, and a printing device 3; the feeding device 1 is provided with a conveying structure capable of moving the sheet material 24 a certain distance, which can be a conveyor belt structure 6, or a rotating conveying disk structure 7, or the movement of the sheet material 24 can also be realized by using a robotic arm or a sliding track. However, the speed of the robotic arm and the sliding track is relatively difficult to increase compared with other structures. For high-speed printers, they are generally not used. However, if the speed of the linear movement structure is improved in the future, the robotic arm or the sliding track can also be used to move the sheet material 24.

[0036] The vision device 4 is provided with a camera capable of identifying the image or contour of a moving or stationary object. In the embodiment, the sheet material is always in a moving state, so it is generally identified by scanning; no matter where the sheet material 24 rotates to on the horizontal plane, it can be identified. In this way, the efficiency is higher when manually placing the sheet material 24, and there is no need to consider the placement angle of the sheet material 24. Of course, the sheet material 24 needs to have a certain flatness. If it is bent or deformed, it cannot be identified by a two-dimensional camera. The camera can also refer to the technical solution in CN218500124U.

[0037] The printing device 3 is provided with an inkjet structure capable of printing various patterns or marking process position lines according to the image or contour identified by the vision device 4. The nozzles of the printing device 3 can be arranged in a straight line. In this way, even if the sheet material 24 moves at a high speed, it must pass through the nozzles of the printing device 3 at any position. Just spray ink in time when passing through the nozzles. The printing device 3 is a prior art and can refer to the technical solution in CN218500124U. This device is a purchased product and is not drawn to scale in the figure.

[0038] The heating device 5 is provided with a heating rod 11 integrated with the extrusion device 2 to heat the sheet material 24 when the extrusion device 2 extrudes the sheet material 24, or is provided with a heating lamp or a heating rod 11 to perform non-direct-contact heating on the sheet material 24 at a certain position; the extrusion device 2 is a pressure roller 8 that can roll the sheet material 24, or the extrusion device 2 is a flat structure and realizes the extrusion of the sheet material 24 by moving relatively up and down, so that the sheet material 24 becomes flatter under the action of pressure; after being extruded by the extrusion device 2, the sheet material 24 moves away from the heating device 5, the temperature decreases and it maintains a flat state, and under the conveyance of the feeding device 1, it reaches the position of the vision device 4 for image recognition, and finally reaches the position of the printing device 3 to complete the printing of the specified lines or patterns.

[0039] The heating device 5 can also be heated by electromagnetic induction, or by a heat pump, or by fuel, or by other means such as oil, water or steam. Only the corresponding pipelines need to be set. Of course, the easiest way to control and with a simple structure is the electric heating method.

[0040] Embodiment 1:

[0041] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6 shown, the line drawing machine is provided with a frame 9 and a housing 10. The pressure roller 8 is directly or indirectly installed on the frame 9. The heating rod 11 is arranged inside the pressure roller 8, so that the extrusion device 2 and the heating device 5 form a hot roller 12 with a heating function. Since the hot roller 12 needs to rotate, the heating rod 11 is slidably connected to the power supply through a brush ring 13 and a brush. The feeding device 1 is a conveyor belt structure 6 directly or indirectly driven by a motor 15. There is a heating cover 14 behind the printing device 3 and above the conveyor belt 23. The heating cover 14 is provided with a heating lamp or a heating rod 11, which can bake the ink. The vision device 4 is provided with a vision frame 16, and the vision frame 16 is installed on the frame 9. The printing device 3 is provided with a printing table 17, and the printing table 17 is provided with a moving track to facilitate the maintenance of the printing device 3. The printing device 3 is fixed at a specified position during operation and does not need to move. Similarly, the vision device 4 is also fixed on the vision frame 16 during operation.

[0042] As Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 and Figure 6As shown, the conveyor belt structure 6 includes a driving roller 18, an auxiliary roller 19, a supporting roller 20, a front roller 21, a rear roller 22 and a conveyor belt 23. The front roller 21 is located at the forefront, and the rear roller 22 is located at the rearmost end. Between the front roller 21 and the hot roller 12 is a loading table, and between the printing device 3 and the rear roller 22 is a receiving table. The driving roller 18 and the auxiliary roller 19 are symmetrically arranged on both sides of the conveyor belt 23 and are close to each other to clamp the conveyor belt 23 and can drive the conveyor belt 23 to move. The driving roller 18 and the auxiliary roller 19 clamp the conveyor belt 23 one above the other. The hot roller 12 and the supporting roller 20 are arranged on the upper and lower sides of the conveyor belt 23 with a certain spacing, so that when the sheet material 24 and the conveyor belt 23 move between the hot roller 12 and the supporting roller 20, the hot roller 12 can directly or indirectly extrude the sheet material 24. The hot roller 12 is located above the supporting roller 20. The hot roller 12 indirectly extrudes the sheet material 24, and the heating speed is a little slower but the heating is more uniform. The hot roller 12 directly extrudes the sheet material 24, and the heating speed is fast, which can improve the working efficiency of the printer.

[0043] As Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, the driving roller 18 and the auxiliary roller 19 are driven by a first transmission component 25, the hot roller 12 and the supporting roller 20 are driven by a second transmission component 26, the driving roller 18 and the supporting roller 20 are driven by a chain or a belt and a tensioning wheel 27 is provided to ensure the synchronous rotation of the driving roller 18 and the supporting roller 20. The feeding device 1 is also provided with a speed sensor or a position sensor to detect the speed or displacement of the conveyor belt 23. The first transmission component 25 and the second transmission component 26 can adopt gear or pulley and sprocket transmission. The pulley and the sprocket need to be provided with a tensioning wheel to adjust the spacing. The gear can be not specially set. Even if there is a small radial movement, the transmission ratio remains unchanged. Since the thickness change of the sheet material 24 is not large, the use of gears can fully meet the transmission requirements, and the structure is simpler.

[0044] As Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6As shown, the conveyor belt structure 6 further includes a first bracket 31, a second bracket 37, a first bearing block 32, a second bearing block 38, a first adjusting spring 33, a second adjusting spring 39, a first adjusting screw 34 and a second adjusting screw 40. The first bracket 31, the second bracket 37, the first bearing block 32, the second bearing block 38, the first adjusting spring 33, the second adjusting spring 39, the first adjusting screw 34 and the second adjusting screw 40 are all provided with two groups symmetrically arranged on both sides of the conveyor belt 23 to limit the driving roller 18, the auxiliary roller 19, the supporting roller 20 and the heating roller 12. The first bracket 31 and the second bracket 37 are fixed to the frame 9. Both the first transmission assembly 25 and the second transmission assembly 26 are driven by gears. The driving roller 18 is rotatably mounted on the first bracket 31. The first bracket 31 is provided with a first track 35. The auxiliary roller 19 is rotatably mounted on the first bearing block 32 relative to the first bearing block 32. The first bearing block 32 is slidably mounted on the first track 35 relative to the first track 35. One end of the first adjusting spring 33 abuts against the first bearing block 32 and the other end abuts against the first adjusting screw 34. The first bracket 31 is provided with a threaded hole so that the first adjusting screw 34 can be installed in the threaded hole and the deformation amount of the first adjusting spring 33 can be controlled by the installation depth of the first adjusting screw 34. The supporting roller 20 is rotatably mounted on the second bracket 37. The second bracket 37 is provided with a second track 41. The heating roller 12 is rotatably mounted on the second bearing block 38 relative to the second bearing block 38. The second bearing block 38 is slidably mounted on the second track 41 relative to the second track 41. One end of the second adjusting spring 39 abuts against the second bearing block 38 and the other end abuts against the second adjusting screw 40. The second bracket 37 is provided with a threaded hole so that the second adjusting screw 40 can be installed in the threaded hole and the deformation amount of the second adjusting spring 39 can be controlled by the installation depth of the second adjusting screw 40. The first track 35 and the second track 41 can be linear slide rails or sliding tracks in the shape of dovetail grooves and can move along a straight line. A supporting spring 44 is provided at the lower end of the second bearing block 38. One end of the supporting spring 44 abuts against the second bearing block 38 and the other end abuts against the lower end of the second bracket 37. The supporting spring 44 and the second adjusting spring 39 act in opposite directions to keep a certain gap between the supporting roller 20 and the heating roller 12. The size of the gap can be adjusted by rotating the second adjusting screw 40. The first bracket 31 can adopt the same layout design as the second bracket 37 and also be provided with a supporting spring 44, but the driving roller 18 and the auxiliary roller 19 only need to clamp the conveyor belt 23 and there is no need to set a gap. The first bracket 31 is provided with two arranged at both ends of the driving roller 18 and the auxiliary roller 19. The second bracket 37 is provided with two arranged at both ends of the supporting roller 20 and the heating roller 12. The supporting roller 20, the heating roller 12, the driving roller 18 and the auxiliary roller 19 can be installed and positioned by adopting the same structure.

[0045] As Figure 2 , Figure 3 ,Figure 4 , Figure 5 and Figure 6 As shown in Figure 4 , Figure 5 , and Figure 6 , a suction cup 28 is provided below the conveyor belt 23. The conveyor belt 23 is made of a breathable material. A plurality of suction holes 29 are provided on the side of the suction cup 28 in contact with the conveyor belt 23. The suction cup 28 and the negative pressure fan 30 are connected by a pipeline to provide negative pressure for the suction cup 28 so that the sheet material 24 located on the conveyor belt 23 will be adsorbed on the conveyor belt 23. The suction cup 28 can be provided with a plurality of independent chambers connected to the pipeline to reduce the mutual influence of air pressures at different positions, so that the sheet material 24 can be adsorbed more stably on the conveyor belt 23.

[0046] As Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown in Figure 2 , Figure 3 , Figure 4 , Figure 5 , and Figure 6 , the camera uses a line scan camera to quickly identify the planar contour of a moving object. The printing device 3 is provided with inkjet structures of multiple colors to spray patterns or lines of different colors. Preferably, the printed colors are black, red, yellow, and blue. The camera is as far away from the printing device 3 as possible, so that the speed of the conveyor belt 23 can be increased, and the distance between the front roller 21 and the heating roller 12 can be appropriately lengthened, which is convenient for multiple people to work simultaneously to place the sheet material 24 on the conveyor belt 23 to improve the printing efficiency.

[0047] For materials such as general shoe materials, the thickness t = 0.5mm - 6mm. If the thickness of the sheet material 24 is about 4mm, the debugging method of the line drawing machine can be carried out according to the following steps: the speed of the conveyor belt 23 is controlled at 0.5m / s to 1m / s, the temperature of the heating roller 12 is 50 - 70 degrees Celsius, and the optimal is 60 degrees Celsius. The gap between the support roller 20 and the heating roller 12 is controlled by adjusting the second adjusting screw 40. In the embodiment, the conveyor belt 23 is located between the support roller 20 and the heating roller 12, and the remaining gap is 2mm. When encountering particularly thick or thin sheet materials, the gap width between the support roller 20 and the heating roller 12 needs to be appropriately adjusted. The friction force between the conveyor belt 23 and the driving roller 18 and the auxiliary roller 19 needs to be between 250 and 1000 N. If it is too small, it is easy to slip and the printing accuracy will decrease. If it is too large, it will not affect the use of the printer, but the working resistance will be greater and the working efficiency will decrease. Under the action of a large pressure, the service life of the conveyor belt 23 will also decrease. The pressure of the driving roller 18 and the auxiliary roller 19 clamping the conveyor belt 23 is controlled by adjusting the first adjusting screw 34, so that the friction force between the conveyor belt 23 and the driving roller 18 and the auxiliary roller 19 is close to 500 N. For the conveyor belt 23 with a friction coefficient of 0.25, both first adjusting screws 34 need to provide a pressure of 500 N, and a total of 1000 N of pressure is provided. There are two contact surfaces on the conveyor belt 23, and each contact surface has a pressure of 1000 N, so that there is a static friction force of 500 N between the conveyor belt 23 and the driving roller 18 and the auxiliary roller 19.

[0048] Example 2:

[0049] As Figure 7 shown, in this embodiment, the feeding device 1 is a conveying tray structure 7. Other structures of the non-feeding device 1 refer to the design of Embodiment 1. A frustum-shaped conical hot roller 12 is provided on the conveying tray. The conical hot roller 12 can rotate synchronously with the conveying tray. A vision device 4 and a printing device 3 are also provided above the conveying tray. A conveyor belt 42 and a guide bar 43 are further provided at the rear end of the conveying tray. The guide bar 43 can guide the sheet material 24 after printing or marking onto the conveyor belt 23. The conveying tray is a rigid structure, so the sheet material 24 has a stable position on the conveying tray and higher positioning accuracy. The conveying tray is provided with a plurality of suction holes 29, and a semi-circular suction cup 28 is provided below the air holes. The suction cup 28 is arranged below the vision device 4 and the printing device 3.

[0050] Example 3:

[0051] As Figure 8 shown, in this embodiment, the feeding device 1 is a conveying tray structure 7. Other structures of the non-feeding device 1 can refer to the design of Embodiment 1. However, the extrusion device 2 and the heating device 5 are integrated together and the bottom is set as a planar structure, that is, an extrusion block 36 driven by a hydraulic cylinder. And the extrusion device 2 and the heating device 5 rotate with the conveying tray. The extrusion blocks 36 are circumferentially distributed above the conveying tray. However, a vision device 4 and a printing device 3 are provided above the conveying tray to achieve the same function. Compared with the prior art, it can improve the printing accuracy and speed and also has obvious advantages.

Claims

1. A line drawing machine, characterized in that: It includes at least a heating device (5) and an extrusion device (2). The heating device (5) is provided with a heat source, and the heat source heats the sheet material (24) by one or more of direct contact, indirect contact, thermal radiation, and thermal convection. The heat of the heat source is obtained by one or more of resistance heating, electromagnetic heating, fuel heating, heat pump heating, high-temperature gas or liquid heating; the extrusion device (2) is a pressure roller (8) capable of rolling the sheet material, or the extrusion device (2) is two planar structures that directly or indirectly extrude the sheet material by relative movement, so that the sheet material becomes flatter under the action of pressure.

2. The line drawing machine according to claim 1, wherein: It further includes a feeding device (1), a vision device (4), and a printing device (3); the feeding device (1) is provided with a conveying structure capable of moving the sheet material (24) a certain distance; the vision device (4) is provided with a camera capable of identifying the image or contour of the moving or stationary sheet material (24); the printing device (3) is provided with an inkjet structure capable of printing various patterns or marking process position lines according to the image or contour identified by the vision device (4); Under the conveyance of the feeding device (1), the sheet material (24) reaches the position of the vision device (4) for image recognition, and finally reaches the position of the printing device (3) to complete the printing of the specified lines or patterns.

3. The line drawing machine according to claim 2, wherein: The pressure roller (8) is internally provided with a heating rod (11), so that the extrusion device (2) and the heating device (5) form a hot roller (12) with a heating function. The feeding device (1) is a conveyor belt structure (6) directly or indirectly driven by a motor (15).

4. The line drawing machine according to claim 3, wherein: The conveyor belt structure (6) includes a driving roller (18), an auxiliary roller (19), a supporting roller (20), and a conveyor belt (23). The driving roller (18) and the auxiliary roller (19) are symmetrically arranged on both sides of the conveyor belt (23) and are close to each other to clamp the conveyor belt (23) and drive the conveyor belt (23) to move. The hot roller (12) and the supporting roller (20) are arranged on the upper and lower sides of the conveyor belt (23) with a certain distance, so that when the sheet material (24) and the conveyor belt (23) move between the hot roller (12) and the supporting roller (20), the hot roller (12) can directly or indirectly extrude the sheet material (24).

5. The line drawing machine according to claim 4, characterized in that: The driving roller (18) and the auxiliary roller (19) are driven by a first transmission component (25). The hot roller (12) and the supporting roller (20) are driven by a second transmission component (26). The driving roller (18) and the supporting roller (20) are driven by a chain or a belt and are provided with a tensioning wheel (27) to ensure the synchronization of the rotation of the driving roller (18) and the supporting roller (20). The feeding device (1) is further provided with a speed sensor or a position sensor to detect the speed or displacement of the conveyor belt (23).

6. The line drawing machine according to claim 5, wherein: The conveyor belt structure (6) further includes a first bracket (31), a second bracket (37), a first bearing block (32), a second bearing block (38), a first adjusting spring (33), a second adjusting spring (39), a first adjusting screw (34) and a second adjusting screw (40). The first bracket (31) and the second bracket (37) are fixed to the frame (9). Both the first transmission assembly (25) and the second transmission assembly (26) are driven in a gear manner. The driving roller (18) is rotatably mounted on the first bracket (31). The first bracket (31) is provided with a first track (35). The auxiliary roller (19) is rotatably mounted on the first bearing block (32) relative to the first bearing block (32). The first bearing block (32) is slidably mounted on the first track (35) relative to the first track (35). One end of the first adjusting spring (33) abuts against the first bearing block (32) and the other end abuts against the first adjusting screw (34). The first bracket (31) is provided with a threaded hole so that the first adjusting screw (34) can be installed in the threaded hole and the deformation amount of the first adjusting spring (33) can be controlled by the installation depth of the first adjusting screw (34). The supporting roller (20) is rotatably mounted on the second bracket (37). The second bracket (37) is provided with a second track (41). The heating roller (12) is rotatably mounted on the second bearing block (38) relative to the second bearing block (38). The second bearing block (38) is slidably mounted on the second track (41) relative to the second track (41). One end of the second adjusting spring (39) abuts against the second bearing block (38) and the other end abuts against the second adjusting screw (40). The second bracket (37) is provided with a threaded hole so that the second adjusting screw (40) can be installed in the threaded hole and the deformation amount of the second adjusting spring (39) can be controlled by the installation depth of the second adjusting screw (40).

7. The line drawing machine according to any one of claims 4 to 6, characterized in that: A suction cup (28) is provided below the conveyor belt (23). The conveyor belt (23) is made of a breathable material. The side of the suction cup (28) in contact with the conveyor belt (23) is provided with a plurality of suction holes (29). The suction cup (28) and the negative pressure fan (30) are connected by a pipeline to provide negative pressure for the suction cup (28) so that the sheet material (24) located on the conveyor belt (23) is adsorbed on the conveyor belt (23).

8. The line drawing machine according to claim 7, characterized in that: The camera adopts a line scan camera and can quickly identify the planar contour of a moving object.

9. The line drawing machine according to claim 8, characterized in that: A heating cover (14) is provided behind the printing device (3) and above the conveyor belt (23). A heating lamp or a heating rod is provided in the heating cover (14).

10. The line drawing machine according to claim 9, characterized in that: The printing device (3) is provided with an inkjet structure of multiple colors and can spray patterns or lines of different colors.

Images