Screen printing machine

Abstract

The screen printing machine comprises a main machine frame, an input device, a printing roller and an output device are sequentially arranged on the main machine frame, a scraper device and a screen frame device are arranged at the position, on the upper side of the printing roller, of the main machine frame, the printing roller comprises a center shaft, a paper receiving roller, a sealing plate and a ventilation plate, and a paper receiving notch and a plurality of rows of adsorption holes are formed in the paper receiving roller. A paper receiving notch is formed in the center shaft, a paper receiving assembly is arranged in the paper receiving notch and comprises a paper clip shaft and a paper clip pressing piece, a paper clip lower plate and a paper blocking strip are arranged on the paper receiving notch, a clip opening cam is arranged on the center shaft, an indexing groove is formed in the clip opening cam, and the end of the paper clip shaft is in transmission connection with a clip opening swing arm of the clip opening cam. The center shaft is provided with a suction cup supporting plate on one side of the ventilation plate, and the suction cup supporting plate is provided with a vacuum suction cup and a suction cup base. The device has the advantages of simple structure, reasonable design, high printing efficiency, high yield and the like.

Description

Technical Field

[0001] The invention relates to a printing machine, in particular to a screen printing machine. Background Art

[0002] Traditional screen printing machines use the input of the main motor to convert the output through multiple sets of mechanical structures to provide drive for various mechanisms, such as the intermittent rotation of the printing roller, the reciprocating translation of the screen frame device, the up and down periodic movement of the scraper device, the horizontal left and right movement of the air gauge device, etc. Therefore, each movement is maintained by a relatively fixed functional relationship by the mechanical structure. This driving method is not only complex in structure but also slow and inefficient. In addition, when printing, the paper is clamped by the paper teeth on the roller to rotate and cooperate with the moving screen frame for printing. The roller clamps the paper and prints a certain distance before releasing the paper, allowing it to stretch naturally and pass to the paper feed table. When printing thick or hard paper, when the teeth release the paper, the paper rebounds due to its own tension, which is not only easy to hit the screen frame and damage the printed image, but also easy to deviate under the action of the paper's own weight, affecting printing and yield. Summary of the invention

[0003] The purpose of the present invention is to solve the deficiencies of the prior art and to provide a screen printing machine with simple structure, reasonable design, high printing efficiency and high yield.

[0004] The technical solution adopted by the present invention to solve its technical problems is: a screen printing machine, including a main frame, on which an input device, a printing roller, and an output device are arranged in sequence; the main frame is provided with a scraper device and a screen frame device for printing in cooperation with the scraper device on the upper side of the printing roller; the printing roller includes a central axis and a paper receiving roller sleeved on the central axis; the central axis is provided with a sealing plate and a ventilation plate at both ends of the paper receiving roller, respectively; the paper receiving roller is provided with a paper receiving assembly, and the surface of the paper receiving roller is evenly provided with a plurality of rows of adsorption holes along its axial direction; the paper receiving roller is provided with a paper receiving slot, and the paper receiving assembly is arranged in the paper receiving slot; the paper receiving assembly includes a paper clamp shaft, and the paper clamp shaft is arranged on the paper receiving roller. The inner cavity is rotatably connected with the sealing plate, a plurality of paper clip pressure pieces are rotatably provided on the paper clip shaft at the paper receiving slot, and a paper clip lower plate is provided on the side of the paper receiving slot facing the input device, and the paper clip pressure piece can abut against the paper clip lower plate after rotation, and paper stop strips are provided on both sides of the paper clip lower plate corresponding to the paper clip pressure piece, and the central shaft is sleeved with a clamping cam on one side of the sealing plate, and the clamping cam is provided with a dividing groove along its circumference, the end of the paper clip shaft passes through the sealing plate and is provided with a clamping swing arm transmission-connected to the clamping cam, and a dividing bearing embedded in the dividing groove is riveted on the clamping swing arm; the central shaft is provided with a suction cup support plate on one side of the ventilation plate, and the suction cup support plate is provided with a vacuum suction cup and a suction cup seat connected with the adsorption hole. By adopting the above structure, by arranging the paper receiving assembly in the printing roller, the surface of the printing roller is kept flat and the structure is more compact. The clamping cam controls the closing of the paper clamp pressure piece to clamp the paper with the lower plate of the paper clamp and transport it to the surface of the printing roller. When printing, the paper is adsorbed on the surface of the printing roller by the vacuum suction cup. When the printing roller rotates to a certain angle, the paper clamp pressure piece releases the paper. Under the adsorption of the vacuum suction cup, the paper can still be firmly attached to the surface of the printing roller after the paper clamp pressure piece releases the paper, avoiding the paper from rebounding or shifting due to its own tension or weight, thereby improving the printing quality and yield rate. After printing, the vacuum suction cup changes from adsorption to blowing, and the paper is separated from the printing roller, ensuring the separation efficiency of the paper and the printing roller, thereby improving the overall printing efficiency.

[0005] Preferably, a plurality of intermediate shaft seats sleeved on the outside of the paper clamp shaft are fixedly provided in the paper receiving slot, the top of the intermediate shaft seat coincides with the outer ring of the paper receiving roller, the paper clamp shaft is provided with three paper clamp seats between two adjacent intermediate shaft seats, the paper clamp pressing piece is rotatably provided on the paper clamp seat, the middle position of the paper clamp pressing piece is riveted to the paper clamp seat through a hinge pin, and a buffer spring is provided between the rear end of the paper clamp pressing piece and the paper clamp seat. With the above structure, the top of the intermediate shaft seat coincides with the outer ring of the paper receiving roller, making the surface of the paper receiving roller smoother, and the setting of the intermediate shaft seat can also ensure the overall smooth rotation of the paper clamp shaft, and by providing a buffer spring between the paper clamp pressing piece and the paper clamp seat, the paper clamp pressing piece can clamp the paper more smoothly, thus avoiding the paper clamp pressing piece from damaging the paper.

[0006] Preferably, the indexing groove includes a first opening clamping portion located at the upper part thereof, biased toward the output device side, and a closing clamping portion, a second opening clamping portion, and a transition portion arranged counterclockwise along the indexing groove to form a closed loop with the first opening clamping portion. The first opening clamping portion and the second opening clamping portion are arc grooves recessed toward the axis center of the opening clamping cam, the closing clamping portion is an arc groove with the axis center of the opening clamping cam as the center, the transition portion is an arc groove connecting the bottom of the second opening clamping portion and the top of the first opening clamping portion, the main frame is provided with an opening clamping adjustment motor and an adjustment shaft transmission-connected to the opening clamping adjustment motor, the adjustment shaft is provided with an adjustment cam, and an adjustment connecting arm is provided between the opening clamping cam and the adjustment cam. With the above structure, when the opening and clamping swing arm is located in the first opening and clamping part, the paper clamp pressure piece quickly opens and closes to clamp the paper; when the opening and clamping swing arm is located in the closing and clamping part, the paper clamp pressure piece firmly clamps the paper, making it convenient for the vacuum suction cup to accurately adsorb the paper on the surface of the paper receiving roller; when the opening and clamping swing arm is located in the second opening and clamping part, the paper has been firmly adsorbed on the surface of the paper receiving roller, and the paper clamp pressure piece opens to facilitate the subsequent separation of the paper from the paper receiving roller; when the opening and clamping swing arm is located in the transition part, the paper clamp pressure piece slowly closes to avoid affecting the separation of the paper from the paper receiving roller; the cam is controlled by the opening and clamping adjustment motor to control the opening and closing time of the paper clamp pressure piece.

[0007] Preferably, the end face of the paper receiving roller is provided with a plurality of adsorption cavities along its axial direction, each of the adsorption cavities is connected with two groups of adsorption holes, and vents are provided at the corresponding adsorption cavities on the ventilation plate, and a suction cup cavity matching with several adjacent vents is provided on the upper side of the corresponding paper receiving roller on the suction cup seat, and a blowing port matching with the vent is provided on one side of the suction cup cavity along the rotation direction of the paper receiving roller, and an adjustment fixed shaft is provided on the main frame, and an adjustment strip is provided between the adjustment fixed shaft and the suction cup support plate. With the above structure, as the printing roller rotates, the vacuum suction cup always adsorbs the part of the paper to be printed on the roller surface and cooperates with the screen frame through the suction cup cavity and multiple groups of adsorption cavities to prevent the paper from deflecting or rebounding during printing, and separates the paper from the paper receiving roller through the blowing port after printing, and the adjustment strip and the adjustment fixed shaft can facilitate the relative angle and position between the vacuum suction cup and the ventilation plate.

[0008] Preferably, the main frame is provided with a driving device for driving the printing roller and the screen frame device at the lower side of the printing roller, the driving device comprises a first driving cavity and a second driving cavity respectively arranged on both sides of the main frame, transparent panels are provided on the outer sides of the first driving cavity and the second driving cavity, a driving transmission shaft is provided for rotation between the first driving cavity and the second driving cavity, the two ends of the driving transmission shaft and the central shaft extend to the inner cavities of the first driving cavity and the second driving cavity respectively, the main frame is provided with a first servo motor on the first driving cavity, the first servo motor is provided with a first input gear on the inner side of the first driving cavity, the driving transmission shaft is provided with a first driven gear and a first driving gear in the first driving cavity, the first driven gear is meshed with the first input gear, and the central shaft is provided with a A first output gear meshed with the first driving gear, the first output gear is connected to the screen frame device in a transmission manner, the main frame is provided with a second servo motor on the second driving cavity, the second servo motor is provided with a second input gear on the inner side of the second driving cavity, the driving transmission shaft is sleeved with a second driving gear and a second transmission gear in the second driving cavity, the second transmission gear is provided with a second driven gear meshed with the second input gear, the central shaft is sleeved with a second output gear and a second supporting gear respectively meshed with the second driving gear and the second transmission gear in the second driving cavity, the second output gear drives the central shaft to rotate, the second supporting gear is connected to the screen frame device in a transmission manner, the first output gear and the second supporting gear can rotate relative to the central shaft, and the second transmission gear can rotate relative to the driving transmission shaft. With the above structure, by setting the first drive cavity, the second drive cavity and the transparent panel, it is convenient to observe and maintain the driving device. The screen frame device and the printing roller are driven by the first servo motor and the second servo motor respectively. Before printing, the position of the screen frame device can be adjusted by driving the first servo motor to achieve precise alignment, and the screen frame device and the printing roller can also be made to work synchronously by adjusting the rotation speed of the first servo motor and the second servo motor, thereby improving the printing efficiency and printing accuracy. In addition, the gears that drive the screen frame device and the printing roller are installed at both ends of the central shaft and the driving transmission shaft, thereby simplifying the structure and improving the transmission stability.

[0009] Preferably, the net frame device comprises a net frame slidably arranged on a main frame, rack rails are arranged on both sides of the main frame, a plurality of rack sliders are slidably arranged on the rack rails, and net frame racks are also arranged on both sides of the net frame in transmission connection with a driving device, and the net frame racks on both sides of the net frame are respectively located on the upper sides of the first driving cavity and the second driving cavity and are in transmission connection with the first output gear and the second supporting gear. With the above structure, the transmission stability of the net frame device is improved by meshing the first output gear and the second supporting gear with the net frame racks on both sides of the net frame device.

[0010] Preferably, the input device comprises an input bridge plate arranged on the main frame, the main frame is provided with a large gauge bridge plate on the side of the input bridge plate close to the printing roller, an input conveyor belt is arranged between the input bridge plate and the large gauge bridge plate, the main frame is provided with a swing shaft on the upper side of the large gauge bridge plate, and the swing shaft is provided with a plurality of upper paper pressing sheets in parallel on the side facing the printing roller. The above structure improves the efficiency and stability of paper input.

[0011] Preferably, the main frame is provided with an air gauge device on the side of the input device close to the printing roller, and the air gauge device is divided into two groups. The two groups of air gauge devices are symmetrically arranged on both sides of the large gauge bridge plate, and the air gauge device includes a gauge slide rail, a gauge guide rail, and a gauge adjustment rod. The main frame is provided with a gauge adjustment motor for driving the gauge adjustment rod to rotate. The gauge slide rail, the gauge guide rail, and the gauge adjustment rod are provided with two side panels, and a front panel, a rear panel, a gauge motor, and a reducer are provided between the two side panels. The output end of the reducer passes through the front panel and a gauge swing arm is provided at the end. A gauge bridge plate is provided on the top of the front panel and the rear panel, and a movable groove is provided on the gauge bridge plate along the swinging direction of the gauge swing arm. A gas nozzle slider is provided in the movable groove for sliding, and a gas nozzle connecting arm is provided at the bottom of the gas nozzle slider. A rotating shaft is provided on the connecting arm, and a gauge bearing is riveted on the rotating shaft at the position corresponding to the gauge swing arm. The top of the gauge swing arm is provided with a swing arm notch which is sleeved on the outside of the gauge bearing. An air cavity is provided on the air nozzle slider, and a connecting hole which communicates with the air cavity is provided on the side wall of the air nozzle slider. A gauge plate is embedded on the upper side of the air cavity of the air nozzle slider, and air holes are evenly provided on the gauge plate. A number of air nozzle rails for sliding the air nozzle slider are provided between the two side plates. An upper pressure plate is provided on the side plate at the position corresponding to the movable groove on the upper side of the gauge bridge plate, and an inclined guide plate is provided on the upper pressure plate on the side of the paper entry direction. A number of steel ball holes are evenly opened on the upper pressure plate at the gauge plate corresponding to the air nozzle slider, and glass beads are provided in the steel ball holes. A steel ball seat is provided on the upper side of the upper pressure plate of the side plate, and a limiting groove is provided on the steel ball seat at the position corresponding to the glass beads. By adopting the above structure, the air nozzle slider is driven to slide by the drawing gauge motor, which is convenient for control and has a fast positioning speed. An air cavity is set on the air nozzle slider, and the drawing gauge plate is embedded in the upper end of the air cavity to reduce the volume of the entire device. By setting an upper pressure plate, the drawing gauge plate can better adsorb the paper, and the guide plate can allow the paper to be better fed between the upper pressure plate and the drawing gauge plate to avoid damage to the paper. A plurality of glass beads are set to press the paper to prevent the edge of the paper from curling up and affecting the adsorption effect of the drawing gauge plate.

[0012] Preferably, the scraper device includes a scraper fixing seat, wherein scraper swing arm seats are provided on the scraper fixing seat, and one end of the scraper swing arm seat is rotatably connected to the main frame, and a scraper adjusting cylinder is provided between the middle section of the scraper swing arm seat and the main frame, and a scraper adjusting cylinder is provided. By adopting the above structure, the scraper adjustment cylinder is set to control the upper scraper to flip on the main frame, and the horizontal adjustment nut and horizontal adjustment rod are set on the scraper fixing seat to adjust the front and rear position of the upper scraper. The scraper guide rail and scraper screw can conveniently adjust the up and down position of the upper scraper.

[0013] Preferably, the output device comprises a rear air suction plate hingedly connected to the main frame, an output regulating cylinder is arranged between the rear air suction plate and the main frame, an output conveyor belt is arranged on the rear air suction plate, an output bridge plate is arranged on the side of the rear air suction plate close to the printing roller of the main frame, a plurality of rear rubber strips are arranged side by side on the output bridge plate facing the printing roller, a paper feed wheel shaft is arranged on the upper side of the rear air suction plate close to the printing roller of the main frame, and a rear conveying wheel is arranged on the paper feed wheel shaft through the rotation of the rear conveying wheel frame. The above structure improves the efficiency of paper output.

[0014] The invention has the advantages of simple structure, reasonable design, high printing efficiency, high yield rate, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic diagram of the output terminal structure of an embodiment of the present invention; Figure 2 is a schematic diagram of the input terminal structure of an embodiment of the present invention; Figure 3 is a cross-sectional view of an embodiment of the present invention; Figure 4 It is a schematic structural diagram of the driving device of the present invention; Figure 5 It is a structural schematic diagram of the scraper device of the present invention; Figure 6 It is a structural schematic diagram of the printing roller of the present invention; Figure 7 is a cross-sectional view of the printing roller of the present invention; Figure 8 It is a structural schematic diagram of the paper splicing assembly of the present invention; Fig. 9 is a side view of the printing roller of the present invention; Fig.10 It is a side view of the clamping cam of the present invention; Fig.11 It is a structural schematic diagram of the ventilation plate and the suction cup seat of the present invention; Fig.12 This is a schematic diagram of the installation structure of the air drawing gauge device of the present invention. Fig.13 It is a schematic diagram of the output end structure of the air drawing gauge device of the present invention; Fig.14 It is a schematic diagram of the input end structure of the air drawing gauge device of the present invention; Fig.15 It is a structural schematic diagram of the drawing gauge motor and the air nozzle slider of the present invention; Fig.16 It is a structural schematic diagram of the pull gauge swing arm of the present invention; Fig.17 It is a cross-sectional view of the air nozzle slider of the present invention.

[0016] In the figure: 1, main frame; 2, input device; 21, input bridge plate; 22, pull gauge large bridge plate; 23, input conveyor belt; 24, swing shaft; 25, upper paper sheet; 3, printing roller; 31, central axis; 32, paper receiving roller; 321, adsorption hole; 322, paper receiving slot; 323, adsorption chamber; 33, sealing plate; 34, ventilation plate; 341, ventilation port; 35, paper receiving assembly; 351, paper clamp shaft; 352, paper clamp pressure sheet; 353, paper clamp lower plate; 354, paper stop strip; 355, intermediate shaft seat; 356, paper clamp seat; 357, hinge pin; 358, buffer spring; 36, clamp opening cam; 361, indexing groove; 362, first clamp opening part; 363, clamp closing part; 364, second clamp opening part; 365, Transition part; 366, clamping adjustment motor; 367, adjustment shaft; 368, adjustment cam; 369, adjustment connecting arm; 37, clamping swing arm; 371, indexing bearing; 38, suction cup support plate; 381, vacuum suction cup; 382, ​​suction cup seat; 383, suction cup cavity; 384, air blowing port; 385, adjustment fixed shaft; 386, adjustment strip; 4, output device; 41, rear suction plate; 42, output adjustment cylinder; 43, output conveyor belt; 44, output bridge plate; 45, rear rubber strip; 46, paper feed wheel shaft; 47, rear feed wheel frame; 48, rear conveyor wheel; 5, scraper device; 51, scraper fixing seat; 511, horizontal adjustment nut; 512, horizontal adjustment rod; 52, scraper swing arm seat; 521, scraper adjustment cylinder; 53. Scraper guide rail; 54. Scraper screw rod; 55. Scraper square shaft; 56. Angle adjustment seat; 57. Upper scraper; 571. Scraper rubber; 58. Rubber stop plate; 581. Rubber stop cylinder; 59. Rubber stop groove; 591. Rubber stop shaft; 592. Rubber stop motor; 593. Rubber stop swing arm; 6. Net frame device; 61. Net frame; 62. Rack slide rail; 63. Rack slider; 64. Net frame rack; 7. Driving device; 71. First driving chamber; 711. First servo motor; 712. First input gear; 713. First driven gear; 714. First driving gear; 715. First output gear; 72. Second driving chamber; 721. Second servo motor; 722. Second input gear; 723. Second driving gear; 7 24. Second transmission gear; 725. Second driven gear; 726. Second output gear; 727. Second supporting gear; 73. Transparent panel; 74. Driving transmission shaft; 8. Air gauge device; 81. Gauge slide rail; 82. Gauge guide rail; 83. Gauge adjustment rod; 84. Gauge adjustment motor; 85. Side plate; 851. Air nozzle slide rail; 852. Upper pressure plate; 853. Guide plate; 854. Steel ball hole; 855. Glass bead; 856. Steel ball seat; 857. Limiting groove; 86. Front panel; 87. Rear panel; 88. Gauge motor; 881. Reducer; 882. Gauge swing arm; 883. Swing arm notch; 89. Gauge bridge plate; 891. Movable groove; 892. Air nozzle slider; 893. Air nozzle connecting arm;894, rotating shaft; 895, drawing gauge bearing; 896, air cavity; 897, connecting hole; 898, drawing gauge plate; 899, air hole. ; DETAILED DESCRIPTION

[0017] The technical solution of the present invention is further described in detail below through specific embodiments in conjunction with the accompanying drawings. Example

[0018] like Figure 1 to Figure 2 The screen printing machine shown in the figure comprises a main frame 1, on which an input device 2, a printing roller 3, and an output device 4 are arranged in sequence, the printing roller 3 comprises a central axis 31, and a paper receiving roller 32 sleeved on the central axis 31, the main frame 1 is provided with a scraper device 5 and a screen frame device 6 for printing in cooperation with the scraper device 5 on the upper side of the printing roller 3; the input device 2 comprises an input bridge plate 21 arranged on the main frame 1, the main frame 1 is provided with a large gauge bridge plate 22 on the side of the input bridge plate 21 close to the printing roller 3, an input conveyor belt 23 is arranged between the input bridge plate 21 and the large gauge bridge plate 22, the main frame 1 is provided with a swing shaft 24 on the upper side of the large gauge bridge plate 22, and the swing shaft 24 faces the printing roller 3. A plurality of upper paper pressing sheets 25 are arranged side by side on one side of the roller 3, thereby improving the efficiency and stability of paper input; the output device 4 comprises a rear suction plate 41 hingedly arranged with the main frame 1, an output regulating cylinder 42 is also arranged between the rear suction plate 41 and the main frame 1, an output conveyor belt 43 is arranged on the rear suction plate 41, an output bridge plate 44 is arranged on the main frame 1 on the side of the rear suction plate 41 close to the printing roller 3, a plurality of rear rubber strips 45 are arranged side by side on the output bridge plate 44 facing the printing roller 3, a paper feed wheel shaft 46 is arranged on the upper side of the rear suction plate 41 close to the printing roller 3 of the main frame 1, a rear conveying wheel 48 is arranged on the paper feed wheel shaft 46 through the rotation of the rear conveying wheel frame 47, thereby improving the efficiency of paper output.

[0019] like Figure 3As shown, the main frame 1 is provided with a driving device 7 for driving the printing roller 3 and the screen frame device 6 to work at the lower side of the printing roller 3, and the driving device 7 includes a first driving cavity 71 and a second driving cavity 72 respectively arranged on both sides of the main frame 1, and a transparent panel 73 is provided on the outer side of the first driving cavity 71 and the second driving cavity 72. The main frame 1 is provided with a driving transmission shaft 74 rotating between the first driving cavity 71 and the second driving cavity 72, and the two ends of the driving transmission shaft 74 and the central axis 31 extend to the inner cavity of the first driving cavity 71 and the second driving cavity 72 respectively. The main frame 1 is provided with a first servo motor 711 on the first driving cavity 71, and the first servo motor 711 is provided at the first driving cavity 71. A first input gear 712 is provided inside the driving cavity 71, and a first driven gear 713 and a first driving gear 714 are sleeved on the driving transmission shaft 74 in the first driving cavity 71, and the first driven gear 713 is meshed with the first input gear 712. The central shaft 31 is sleeved with a first output gear 715 meshed with the first driving gear 714 in the first driving cavity 71, and the first output gear 715 is connected to the screen frame device 6 in a transmission manner. The main frame 1 is provided with a second servo motor 721 on the second driving cavity 72, and the second servo motor 721 is provided with a second input gear 722 inside the second driving cavity 72. The driving transmission shaft 74 is sleeved in the second driving cavity 72 A second driving gear 723 and a second transmission gear 724 are provided. The second transmission gear 724 is provided with a second driven gear 725 meshing with the second input gear 722. The central shaft 31 is sleeved with a second output gear 726 and a second supporting gear 727 in the second driving cavity 72, which are respectively meshed with the second driving gear 723 and the second transmission gear 724. The second output gear 726 drives the central shaft 31 to rotate. The second supporting gear 727 is connected to the screen frame device 6 in a transmission manner. The first output gear 715 and the second supporting gear 727 can rotate relative to the central shaft 31, and the second transmission gear 724 can rotate relative to the driving transmission shaft 74. A first driving cavity 71, a second driving cavity 72 and a transparent panel 73 are arranged to facilitate observation and maintenance of the driving device 7. The screen frame device 6 and the printing roller 3 are driven by a first servo motor 711 and a second servo motor 721 respectively. Before printing, the position of the screen frame device 6 can be adjusted by driving the first servo motor 711 to achieve precise alignment, or the screen frame device 6 and the printing roller can be made to work synchronously by adjusting the rotation speed of the first servo motor 711 and the second servo motor 721, thereby improving printing efficiency and printing accuracy. In addition, the gears driving the screen frame device 6 and the printing roller 3 are installed at both ends of the central shaft 31 and the driving transmission shaft 74, thereby simplifying the structure and improving the transmission stability.

[0020] like Figure 4As shown, the net frame device 6 includes a net frame 61 slidably arranged on the main frame 1, rack slide rails 62 are arranged on both sides of the main frame 1, and the net frame 61 is slidably provided with a plurality of rack sliders 63 on the rack slide rails 62. Net frame racks 64 transmission-connected to the driving device 7 are also arranged on both sides of the net frame 61. The net frame racks 64 on both sides of the net frame 61 are respectively located on the upper sides of the first driving cavity 71 and the second driving cavity 72 and are transmission-connected to the first output gear 715 and the second supporting gear 727. The first output gear 715 and the second supporting gear 727 are meshed with the net frame racks 64 on both sides of the net frame device 6, thereby improving the transmission stability of the net frame device 6.

[0021] like Figure 5 As shown, the scraper device 5 includes a scraper fixing seat 51, scraper swing arm seats 52 are arranged on both sides of the scraper fixing seat 51, one end of the scraper swing arm seat 52 is rotatably connected to the main frame 1, a scraper adjustment cylinder 521 is arranged between the middle section of the scraper swing arm seat 52 and the main frame 1, horizontal adjustment nuts 511 fixedly connected to the scraper swing arm seat 52 are arranged on both sides of the scraper fixing seat 51, a horizontal adjustment rod 512 screwed to the horizontal adjustment nut 511 is arranged on the scraper fixing seat 51, a scraper square shaft 55 is arranged on the lower side of the scraper fixing seat 51 through a scraper guide rail 53 and a scraper screw 54, angle adjustment seats 56 are arranged at both ends of the scraper square shaft 55, upper scrapers 57 are arranged on the lower sides of the two angle adjustment seats 56, and the upper scrapers 57 A scraper rubber 571 is provided at the lower end, and a rubber blocking plate 58 is provided on the lower side of the scraper fixing seat 51 on the side of the upper scraper 57 facing the input device 2 through a rubber blocking cylinder 581, and a rubber blocking shaft 591 and a rubber blocking motor 592 for driving the rubber blocking shaft 591 to rotate are provided on the side of the scraper fixing seat 51 facing the output device 4, and rubber blocking swing arms 593 are provided at both ends of the rubber blocking shaft 591, and a rubber blocking groove 59 is hingedly provided between the two rubber blocking swing arms 593, and the upper scraper 57 is controlled to flip on the main frame 1 by setting a scraper adjusting cylinder 521, and a horizontal adjusting nut 511 and a horizontal adjusting rod 512 are provided on the scraper fixing seat 51 to adjust the front and rear position of the upper scraper 57, and the scraper guide rail 53 and the scraper screw 54 can conveniently adjust the up and down position of the upper scraper 57.

[0022] like Figures 6 to 11As shown, the central axis 31 is respectively provided with a sealing plate 33 and a ventilation plate 34 at both ends of the paper receiving roller 32, the paper receiving roller 32 is provided with a paper receiving assembly 35, the surface of the paper receiving roller 32 is evenly provided with a plurality of rows of adsorption holes 321 along its axial direction, the end face of the paper receiving roller 32 is provided with a plurality of adsorption cavities 323 along its axial direction, and each of the adsorption cavities 323 is connected with two groups of adsorption holes 321; the paper receiving roller 32 is provided with a paper receiving slot 322, the paper receiving assembly 35 is arranged in the paper receiving slot 322, and by arranging the paper receiving assembly 35 in the printing roller 3, the surface of the printing roller 3 is kept flat and the structure is more compact.

[0023] The paper receiving assembly 35 includes a paper clamp shaft 351, which is arranged in the inner cavity of the paper receiving roller 32 and is rotatably connected to the sealing plate 33. A plurality of paper clamp pressure pieces 352 are rotatably provided on the paper clamp shaft 351 at the paper receiving slot 322. The paper receiving slot 322 is provided with a paper clamp lower plate 353 on the side facing the input device 2. The paper clamp pressure piece 352 can abut against the paper clamp lower plate 353 after rotation. The paper clamp lower plate 353 is provided with paper stop strips 354 on both sides corresponding to the paper clamp pressure piece 352. The central shaft 31 is sleeved with a clamp opening cam 36 on one side of the sealing plate 33. The clamp opening cam 36 is provided with a dividing groove 361 along its circumference. The end of the paper clamp shaft 351 penetrates The sealing plate 33 is provided with an opening and clamping swing arm 37 which is transmission-connected to the opening and clamping cam 36 at the end thereof, and a dividing bearing 371 which is embedded in the dividing groove 361 is riveted on the opening and clamping swing arm 37; the central shaft 31 is provided with a suction cup support plate 38 on one side of the ventilation plate 34, and a vacuum suction cup 381 and a suction cup seat 382 which is connected to the adsorption hole 321 are provided on the suction cup support plate 38, and the opening and clamping cam 36 controls the closing of the paper clamp pressing piece 352 to clamp the paper with the paper clamp lower plate 353 and transport it to the surface of the printing roller 3, and the paper is adsorbed on the surface of the printing roller 3 by the vacuum suction cup 381 during printing, and when the printing roller 3 rotates to a certain angle, the paper clamp pressing piece 352 releases the paper, and the vacuum suction cup 3 Under the adsorption of 81, when the paper clamp pressure piece 352 releases the paper, the paper can still be firmly attached to the surface of the printing roller 3, avoiding the paper from rebounding or shifting due to its own tension or weight, thereby improving the printing quality and yield rate. After the printing is completed, the vacuum suction cup 381 changes from adsorption to blowing, and the paper is separated from the printing roller 3, ensuring the separation efficiency of the paper and the printing roller 3, thereby improving the overall printing efficiency; the paper receiving slot 322 is fixedly provided with a plurality of intermediate shaft seats 355 sleeved on the outside of the paper clamp shaft 351, the top of the intermediate shaft seat 355 coincides with the outer ring of the paper receiving roller 32, and the paper clamp shaft 351 is provided between two adjacent intermediate shaft seats 355 There are three paper clip seats 356, and the paper clip pressure piece 352 is rotatably set on the paper clip seat 356. The middle position of the paper clip pressure piece 352 is riveted to the paper clip seat 356 through a hinge pin 357. A buffer spring 358 is provided between the rear end of the paper clip pressure piece 352 and the paper clip seat 356. The top of the intermediate shaft seat 355 coincides with the outer ring of the paper receiving roller 32, so that the surface of the paper receiving roller 32 is smoother, and the setting of the intermediate shaft seat 355 can also ensure the overall smooth rotation of the paper clip shaft 351. By setting a buffer spring 358 between the paper clip pressure piece 352 and the paper clip seat 356, the paper clip pressure piece 352 clamps the paper more smoothly, avoiding damage to the paper by the paper clip pressure piece 352.

[0024] The indexing groove 361 includes a first opening clamping portion 362 located at the upper part thereof, which is biased toward the side of the output device 4, and a closing clamping portion 363, a second opening clamping portion 364, and a transition portion 365 which are arranged counterclockwise along the indexing groove 361 to form a closed loop with the first opening clamping portion 362. The first opening clamping portion 362 and the second opening clamping portion 364 are arc grooves recessed toward the axial center direction of the opening clamping cam 36, the closing clamping portion 363 is an arc groove with the axial center of the opening clamping cam 36 as the center, and the transition portion 365 is an arc groove connecting the bottom of the second opening clamping portion 364 and the top of the first opening clamping portion 362. The main frame 1 is provided with an opening clamping adjustment motor 366 and an adjustment shaft 367 which is transmission-connected to the opening clamping adjustment motor 366. The adjustment shaft 367 is provided with an adjustment cam 368. The opening clamping cam 36 and the adjustment cam 368 are connected to the adjustment cam 36. An adjusting connecting arm 369 is provided between the wheels 368. When the clamping swing arm 37 is located at the first clamping portion 362, the paper clamp pressure piece 352 is quickly opened and closed to clamp the paper. When the clamping swing arm 37 is located at the closing portion 363, the paper clamp pressure piece 352 firmly clamps the paper, which is convenient for the vacuum suction cup 381 to accurately adsorb the paper on the surface of the paper receiving roller 32. When the clamping swing arm 37 is located at the second clamping portion 364, the paper has been firmly adsorbed on the surface of the paper receiving roller 32, and the paper clamp pressure piece 352 is opened to facilitate the subsequent separation of the paper from the paper receiving roller 32. When the clamping swing arm 37 is located at the transition portion 365, the paper clamp pressure piece 352 is slowly closed to avoid affecting the separation of the paper from the paper receiving roller 32. The adjusting cam 368 is controlled by the clamping adjustment motor 366 to control the opening and closing time of the paper clamp pressure piece 352.

[0025] The ventilation plate 34 is provided with ventilation holes 341 at the corresponding adsorption chambers 323, the suction cup seat 382 is provided with suction cup chambers 383 matching the adjacent ventilation holes 341 at the upper side corresponding to the paper receiving roller 32, the suction cup seat 382 is provided with a blowing port 384 matching the ventilation holes 341 on one side of the suction cup chamber 383 along the rotation direction of the paper receiving roller 32, the main frame 1 is provided with an adjustment fixing shaft 385, and a fixing shaft 385 is provided between the adjustment fixing shaft 385 and the suction cup support plate 38. There is an adjustment bar 386. As the printing roller 3 rotates, the vacuum suction cup 381 cooperates with the multiple groups of adsorption chambers 323 through the suction cup cavity 383 to always adsorb the part of the paper to be printed on the roller surface and cooperate with the screen frame for printing, so as to prevent the paper from deflecting or rebounding when printing. After printing, the paper is separated from the paper receiving roller 32 through the blowing port 384, and the adjustment bar 386 and the adjustment fixed shaft 385 can facilitate the relative angle and position between the vacuum suction cup 381 and the ventilation plate 34.

[0026] like Figures 12 to 17As shown, the main frame 1 is provided with an air gauge device 8 on the side of the input device 2 close to the printing roller 3. The air gauge device 8 is divided into two groups. The two groups of air gauge devices 8 are symmetrically arranged on both sides of the large gauge bridge plate 22. The air gauge device 8 includes a gauge slide rail 81, a gauge guide rail 82, and a gauge adjustment rod 83. The main frame 1 is provided with a gauge adjustment motor 84 for driving the gauge adjustment rod 83 to rotate. The gauge slide rail 81, the gauge guide rail 82, and the gauge adjustment rod 83 are provided with two side panels 85. A front panel 86, a rear panel 87, a gauge motor 88, and a reducer 881 are provided between the two side panels 85. The output end of the reducer 881 passes through the front panel 86 and the end is provided with a There is a gauge swing arm 882, and a gauge bridge plate 89 is provided on the top of the front panel 86 and the rear panel 87. A movable groove 891 is provided on the gauge bridge plate 89 along the swing direction of the gauge swing arm 882. A gas nozzle slider 892 is slidably provided in the movable groove 891. A gas nozzle connecting arm 893 is provided at the bottom of the gas nozzle slider 892. A rotating shaft 894 is provided on the gas nozzle connecting arm 893. A gauge bearing 895 is riveted on the rotating shaft 894 at the position corresponding to the gauge swing arm 882. A swing arm notch 883 sleeved on the outside of the gauge bearing 895 is provided on the top of the gauge swing arm 882. An air cavity 896 is provided on the gas nozzle slider 892. A connecting rod 894 is provided on the side wall of the gas nozzle slider 892. The connecting hole 897 of the air cavity 896, the air nozzle slider 892 is embedded with a gauge plate 898 on the upper side of the air cavity 896, and the gauge plate 898 is evenly provided with air holes 899. A plurality of air nozzle slide rails 851 for sliding the air nozzle slider 892 are provided between the two side plates 85. The side plate 85 is provided with an upper pressure plate 852 at a position corresponding to the movable groove 891 on the upper side of the gauge bridge plate 89. The upper pressure plate 852 is provided with an inclined guide plate 853 on one side of the paper entry direction. A plurality of steel ball holes 854 are evenly opened on the upper pressure plate 852 corresponding to the gauge plate 898 of the air nozzle slider 892, and glass beads 855 are arranged in the steel ball holes 854. The side plate 85 is provided with a plurality of steel ball holes 854 on the upper pressure plate 85 2 A steel ball seat 856 is provided on the upper side, and a limit groove 857 is provided on the steel ball seat 856 corresponding to the glass bead 855. The air nozzle slider 892 is driven to slide by the drawing gauge motor 88, which is convenient for control and has a fast positioning speed. An air cavity 896 is provided on the air nozzle slider 892, and the drawing gauge plate 898 is embedded in the upper end of the air cavity 896 to reduce the volume of the entire device. The upper pressure plate 852 can better allow the drawing gauge plate 898 to absorb the paper, and the guide plate 853 can allow the paper to be better moved between the upper pressure plate 852 and the drawing gauge plate 898 to avoid damage to the paper. A plurality of glass beads 855 are provided to press the paper to prevent the edge of the paper from curling up and affecting the absorption effect of the drawing gauge plate 898.

[0027] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A screen printing machine, comprising a main frame (1), wherein an input device (2), a printing roller (3), and an output device (4) are sequentially arranged on the main frame (1), wherein a scraper device (5) and a screen frame device (6) for printing in cooperation with the scraper device (5) are arranged on the upper side of the printing roller (3), and wherein: The printing roller (3) comprises a central shaft (31), a paper receiving roller (32) sleeved on the central shaft (31), the central shaft (31) being provided with a sealing plate (33) and a ventilation plate (34) at both ends of the paper receiving roller (32), the paper receiving roller (32) being provided with a paper receiving assembly (35), and a surface of the paper receiving roller (32) being provided with a plurality of rows of adsorption holes (321) evenly along its axial direction; the paper receiving roller (32) being provided with a paper receiving assembly (35). The paper receiving slot (322) is provided with a paper receiving assembly (35) in the paper receiving slot (322). The paper receiving assembly (35) comprises a paper clamp shaft (351). The paper clamp shaft (351) is provided in the inner cavity of the paper receiving roller (32) and is rotatably connected to the sealing plate (33). A plurality of paper clamp pressing pieces (352) are rotatably provided on the paper clamp shaft (351) at the paper receiving slot (322). The paper receiving slot (322) is rotatably connected to the input device (2 ) is provided with a paper clamp lower plate (353) on one side, the paper clamp pressing plate (352) can abut against the paper clamp lower plate (353) after rotation, the paper clamp lower plate (353) is provided with paper stop strips (354) on both sides corresponding to the paper clamp pressing plate (352), the central shaft (31) is sleeved with a clamp opening cam (36) on one side of the sealing plate (33), the clamp opening cam (36) is provided with a graduation groove (361) along its circumference, and the end of the paper clamp shaft (351) An opening and clamping swing arm (37) is provided at the end thereof and is transmission-connected to the opening and clamping cam (36); a graduation bearing (371) embedded in the graduation groove (361) is riveted to the opening and clamping swing arm (37); a suction cup support plate (38) is provided on one side of the ventilation plate (34) of the central shaft (31); a vacuum suction cup (381) and a suction cup seat (382) connected to the adsorption hole (321) are provided on the suction cup support plate (38).

2. The screen printing machine according to claim 1, characterized in that: A plurality of intermediate shaft seats (355) sleeved on the outside of the paper clamp shaft (351) are fixedly provided in the paper receiving slot (322); the top of the intermediate shaft seat (355) coincides with the outer ring of the paper receiving roller (32); the paper clamp shaft (351) is provided with three paper clamp seats (356) between two adjacent intermediate shaft seats (355); the paper clamp pressing piece (352) is rotatably arranged on the paper clamp seat (356); the middle position of the paper clamp pressing piece (352) is riveted to the paper clamp seat (356) via a hinge pin (357); and a buffer spring (358) is provided between the rear end of the paper clamp pressing piece (352) and the paper clamp seat (356).

3. The screen printing machine according to claim 1, characterized in that: The indexing groove (361) comprises a first opening clamping portion (362) located at the upper part thereof, which is biased toward the output device (4), and a closing clamping portion (363) which is arranged counterclockwise along the indexing groove (361) and forms a closed loop with the first opening clamping portion (362), a second opening clamping portion (364), and a transition portion (365), wherein the first opening clamping portion (362) and the second opening clamping portion (364) are arc-shaped grooves which are recessed in the axial direction of the opening clamping cam (36), and the closing clamping portion (363) is formed by the opening clamping cam (36). The arc groove has an axis (36) as the center of the circle, the transition portion (365) is an arc groove connecting the bottom of the second opening clamping portion (364) and the top of the first opening clamping portion (362), the main frame (1) is provided with an opening clamping adjustment motor (366) and an adjustment shaft (367) connected to the opening clamping adjustment motor (366), the adjustment shaft (367) is provided with an adjustment cam (368), and an adjustment connecting arm (369) is provided between the opening clamping cam (36) and the adjustment cam (368).

4. The screen printing machine according to claim 1, characterized in that: The end surface of the paper receiving roller (32) is provided with a plurality of adsorption cavities (323) along its axial direction, each of the adsorption cavities (323) being connected to two groups of adsorption holes (321); a vent (341) is provided on the vent plate (34) at a position corresponding to the adsorption cavity (323); a suction cup cavity (383) matching with several adjacent vents (341) is provided on the suction cup seat (382) at a position corresponding to the upper side of the paper receiving roller (32); a blowing port (384) matching with the vent (341) is provided on one side of the suction cup cavity (383) along the rotation direction of the paper receiving roller (32); an adjustment fixing shaft (385) is provided on the main frame (1); and an adjustment strip (386) is provided between the adjustment fixing shaft (385) and the suction cup support plate (38).

5. The screen printing machine according to claim 1, characterized in that: The main frame (1) is provided with a driving device (7) for driving the printing roller (3) and the screen frame device (6) at the lower side of the printing roller (3), the driving device (7) comprising a first driving cavity (71) and a second driving cavity (72) respectively arranged on both sides of the main frame (1), the first driving cavity (71) and the second driving cavity (72) are both provided with a transparent panel (73) on the outside, the main frame (1) is rotatably provided with a driving transmission shaft (74) between the first driving cavity (71) and the second driving cavity (72), the two ends of the driving transmission shaft (74) and the central axis (31) respectively extending to The first drive chamber (71) and the second drive chamber (72) are provided with a first servo motor (711) on the first drive chamber (71); the first servo motor (711) is provided with a first input gear (712) inside the first drive chamber (71); the drive transmission shaft (74) is provided with a first driven gear (713) and a first driving gear (714) in the first drive chamber (71); the first driven gear (713) is meshed with the first input gear (712); the central shaft (31) is provided with a first driven gear (713) and a first driving gear (714) in the first drive chamber (71); The main frame (1) is provided with a second servo motor (721) on the second driving cavity (72); the second servo motor (721) is provided with a second input gear (722) inside the second driving cavity (72); the driving transmission shaft (74) is provided with a second driving gear (723) and a second transmission gear (724) in the second driving cavity (72); the second transmission gear (724) is provided with a second driven gear meshing with the second input gear (722) The central shaft (31) is provided with a second output gear (726) and a second support gear (727) in the second driving cavity (72), which are respectively meshed with the second driving gear (723) and the second transmission gear (724); the second output gear (726) drives the central shaft (31) to rotate; the second support gear (727) is in transmission connection with the net frame device (6); the first output gear (715) and the second support gear (727) can rotate relative to the central shaft (31); and the second transmission gear (724) can rotate relative to the driving transmission shaft (74).

6. The screen printing machine according to claim 5, characterized in that: The net frame device (6) comprises a net frame (61) slidably arranged on a main frame (1); rack rails (62) are arranged on both sides of the main frame (1); a plurality of rack sliders (63) are slidably arranged on the rack rails (62) of the net frame (61); net frame racks (64) transmission-connected to the driving device (7) are also arranged on both sides of the net frame (61); the net frame racks (64) on both sides of the net frame (61) are respectively located on the upper sides of the first driving cavity (71) and the second driving cavity (72) and transmission-connected to the first output gear (715) and the second supporting gear (727).

7. The screen printing machine according to claim 1, characterized in that: The input device (2) comprises an input bridge plate (21) arranged on a main frame (1); a large gauge bridge plate (22) is provided on the input bridge plate (21) near the printing roller (3) of the main frame (1); an input conveyor belt (23) is provided between the input bridge plate (21) and the large gauge bridge plate (22); a swing shaft (24) is provided on the upper side of the large gauge bridge plate (22) of the main frame (1); and a plurality of upper pressure sheets (25) are arranged side by side on the swing shaft (24) facing the printing roller (3).

8. The screen printing machine according to claim 7, characterized in that: The main frame (1) is provided with an air gauge device (8) on the side of the input device (2) close to the printing roller (3). The air gauge device (8) is divided into two groups. The two groups of air gauge devices (8) are symmetrically arranged on both sides of the large gauge bridge plate (22). The air gauge device (8) comprises a gauge slide rail (81), a gauge guide rail (82), and a gauge adjustment rod (83). The main frame (1) is provided with a gauge adjustment motor (84) for driving the gauge adjustment rod (83) to rotate. The gauge slide rail (81), the gauge guide rail (82), and the gauge adjustment rod (83) are provided with two side panels (85). A front panel is provided between the two side panels (85). (86), a rear panel (87), a gauge motor (88), and a reducer (881), wherein the output end of the reducer (881) passes through the front panel (86) and is provided with a gauge swing arm (882) at the end, a gauge bridge plate (89) is provided on the top of the front panel (86) and the rear panel (87), a movable groove (891) is provided on the gauge bridge plate (89) along the swing direction of the gauge swing arm (882), a gas nozzle slider (892) is slidably provided in the movable groove (891), a gas nozzle connecting arm (893) is provided at the bottom of the gas nozzle slider (892), a rotating shaft (894) is provided on the gas nozzle connecting arm (893), and the rotating shaft (894) is provided. A gauge bearing (895) is riveted at a position corresponding to the gauge swing arm (882) on the upper side of the side plate (84); a swing arm slot (883) sleeved on the outer side of the gauge bearing (895) is provided at the top of the gauge swing arm (882); an air cavity (896) is provided on the air nozzle slider (892); a connecting hole (897) connected to the air cavity (896) is provided on the side wall of the air nozzle slider (892); a gauge plate (898) is embedded on the upper side of the air cavity (896) of the air nozzle slider (892); air holes (899) are evenly provided on the gauge plate (898); and a plurality of air nozzles for the air nozzle slider (892) to slide are provided between the two side plates (85). A slide rail (851), the side plate (85) is provided with an upper pressure plate (852) on the upper side of the gauge bridge plate (89) corresponding to the movable groove (891), the upper pressure plate (852) is provided with an inclined guide plate (853) on one side of the paper entry direction, a plurality of steel ball holes (854) are evenly opened on the upper pressure plate (852) at the gauge plate (898) corresponding to the air nozzle slider (892), glass beads (855) are arranged in the steel ball holes (854), the side plate (85) is provided with a steel ball seat (856) on the upper side of the upper pressure plate (852), and a limit groove (857) is provided on the steel ball seat (856) at a position corresponding to the glass beads (855).

9. The screen printing machine according to claim 1, characterized in that: The scraper device (5) comprises a scraper fixing seat (51), scraper swing arm seats (52) are provided on both sides of the scraper fixing seat (51), one end of the scraper swing arm seat (52) is rotatably connected to the main frame (1), a scraper adjustment cylinder (521) is provided between the middle section of the scraper swing arm seat (52) and the main frame (1), horizontal adjustment nuts (511) fixedly connected to the scraper swing arm seat (52) are provided on both sides of the scraper fixing seat (51), a horizontal adjustment rod (512) screwed to the horizontal adjustment nut (511) is provided on the scraper fixing seat (51), a scraper square shaft (55) is provided on the lower side of the scraper fixing seat (51) through a scraper guide rail (53) and a scraper screw rod (54), and the Angle adjustment seats (56) are provided at both ends of the scraper square shaft (55), upper scrapers (57) are provided at the lower sides of the two angle adjustment seats (56), and scraper rubber (571) is provided at the lower ends of the upper scrapers (57). A rubber blocking plate (58) is provided at the lower side of the scraper fixing seat (51) on the side of the upper scraper (57) facing the input device (2) through a rubber blocking cylinder (581), and a rubber blocking rotating shaft (591) and a rubber blocking motor (592) for driving the rubber blocking rotating shaft (591) to rotate are provided on the side of the scraper fixing seat (51) facing the output device (4), and rubber blocking swing arms (593) are provided at both ends of the rubber blocking rotating shaft (591), and a rubber blocking groove (59) is hingedly provided between the two rubber blocking swing arms (593).

10. The screen printing machine according to claim 1, characterized in that: The output device (4) comprises a rear air suction plate (41) hingedly connected to the main frame (1), an output regulating cylinder (42) is further provided between the rear air suction plate (41) and the main frame (1), an output conveyor belt (43) is provided on the rear air suction plate (41), an output bridge plate (44) is provided on the main frame (1) at a side of the rear air suction plate (41) close to the printing roller (3), a plurality of rear rubber strips (45) are arranged side by side on the output bridge plate (44) facing the printing roller (3), a paper feed wheel shaft (46) is provided on the upper side of the rear air suction plate (41) close to the printing roller (3), and a rear conveying wheel (48) is rotatably provided on the paper feed wheel shaft (46) via a rear conveying wheel frame (47).

Images