Multi-station recurrent digital printer

Abstract

The invention discloses a multi-station recurrent digital printer, and relates to the technical field of digital printing, the multi-station recurrent digital printer comprises a rack, the outer wall of the top of the rack is provided with a printing machine body, the outer wall of the top of the rack is rotatably connected with a wheel disc frame through a bearing frame, and the outer wall of the wheel disc frame is provided with a plurality of paper winding rollers through a plurality of clamping jaw assemblies; wherein a driving device is fixedly installed on the outer wall of one bearing frame, an output shaft of the driving device is fixedly connected with the axis of the wheel disc frame, every two sets of clamping jaw assemblies correspond to each other and are distributed on the outer walls of the two sides of the wheel disc frame at equal intervals in a circumferential array mode, multiple sets of tensioning assemblies are further installed on the outer wall of the wheel disc frame, and the multiple sets of tensioning assemblies correspond to the multiple paper winding rollers. According to the multi-station paper winding roller, a plurality of paper winding rollers can be installed in advance through the multi-station layout, and when the current paper winding roller is used up, shutdown is not needed, and the standby paper winding roller filled with full roll paper can be rapidly switched to only by driving the wheel disc frame to rotate through the driving device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of digital printing, in particular to a multi-station round digital printer. BACKGROUND

[0002] With the deep integration of digital printing technology and computer technology, digital printers are increasingly widely used in packaging, advertising, textile, electronics and other industries. In the digital printing production of roll paper workpieces such as packaging paper, label paper, and advertising roll materials, the continuity of the roll paper supply of the feeding mechanism directly determines the production efficiency of the equipment. However, the existing digital printer feeding mechanism generally has design defects: only one roll paper roll can be installed on the rack, and the roll paper roll serves as the only supply source. When the roll paper on the roll is exhausted, the machine must be stopped for manual disassembly and replacement. The operator needs to remove the empty roll paper roll and install a new full roll paper roll, and then readjust the traction path and tension of the roll paper. The entire replacement process takes a long time and depends on the operator's proficiency. This single-roll paper feeding design causes the equipment to frequently stop during batch production, severely disrupting the continuous production process and directly causing a significant reduction in production efficiency. Therefore, a multi-station round digital printer is proposed to solve the above problems. SUMMARY

[0003] To solve the above technical problems, a multi-station round digital printer is provided, which solves the problems raised in the background art.

[0004] To achieve the above purposes, the following technical solutions can be used: The present application provides a multi-station round digital printer, comprising a rack, a printer body mounted on the top outer wall of the rack, a wheel disc frame rotatably connected to the top outer wall of the rack through a bearing frame, a plurality of roll paper rolls mounted on the outer wall of the wheel disc frame through a plurality of jaw assembly groups, wherein the outer wall of one of the bearing frames is fixedly mounted with a driving device, the output shaft of the driving device is fixedly connected with the shaft of the wheel disc frame, every two groups of the jaw assembly groups correspond to each other and are arranged in an equidistant circumferential array on the two outer walls of the wheel disc frame, and a plurality of tensioning assemblies are mounted on the outer wall of the wheel disc frame, and the plurality of tensioning assemblies correspond to the plurality of roll paper rolls. An air suction assembly and an auxiliary traction assembly are installed above the rack, and the air suction assembly and the auxiliary traction assembly are located between the wheel disc frame and the printer body.

[0005] Further, the jaw assembly comprises a mounting plate, two rotating members, two jaws, and a reduction motor, the mounting plate is fixedly connected to the outer wall of the wheel disc frame, the two rotating members are symmetrically rotatably connected to the outer wall of the mounting plate and mesh with each other, and the jaws are rotatably connected to the end portions of the rotating members.

[0006] Further, the middle section outer wall of the two clamping jaws is rotationally connected with a connecting rod, one end of the connecting rod away from the clamping jaw is rotationally connected with the outer wall of the mounting plate, and the output shaft of the speed reducer motor is fixedly connected with the outer wall of the mounting plate.

[0007] Further, the tensioning assembly comprises two main arms and two auxiliary arms, the two main arms are rotationally connected with the outer walls on both sides of the wheel disc frame, the two auxiliary arms are rotationally connected with the outer walls of the two main arms, the end portions of the two main arms are rotationally connected with main tensioning rollers, the end portions of the two auxiliary arms are rotationally connected with auxiliary tensioning rollers, and the auxiliary tensioning rollers are located above the main tensioning rollers.

[0008] Further, the tensioning assembly further comprises two stretch springs I and two stretch springs II, one end of the outer wall of the main arm away from the main tensioning roller is fixedly connected with a traction block I, one end of the stretch spring I is hung on the outer wall of the traction block I, and the other end of the stretch spring I is hung on the outer wall of the wheel disc frame, one end of the outer wall of the auxiliary arm away from the auxiliary tensioning roller is fixedly connected with a traction block II, one end of the stretch spring II is hung on the outer wall of the traction block II, and the other end of the stretch spring II is hung on the outer wall of the main arm.

[0009] Further, the air suction assembly comprises a stand, two electric push rods, an air suction cover and a vacuum pump, the stand is fixedly connected with the top outer wall of the rack, the two electric push rods are rotationally connected with the inner walls on both sides of the stand through shafts, and the air suction cover is fixedly installed on the output ends of the two electric push rods.

[0010] Further, the vacuum pump is fixedly installed on the top outer wall of the rack, the suction end of the vacuum pump is connected with the inner cavity of the air suction cover through a connecting pipe, and one side outer wall of the stand is further fixedly installed with a motor I, and the output shaft of the motor I penetrates through the stand and is fixedly connected with one end of the shaft.

[0011] Further, the auxiliary traction assembly comprises two groups of direct drive modules, a U-shaped frame, a movable roller and a fixed roller, the U-shaped frame is fixedly installed on the outer walls of the two groups of direct drive modules, the two groups of direct drive modules are fixedly installed on the top outer wall of the rack, the fixed roller is rotationally connected with the inner walls on both sides of the U-shaped frame, and the movable roller is rotationally connected with two sliding blocks at both ends.

[0012] Further, the inner walls on both sides of the U-shaped frame are installed with extrusion springs, the top end of the extrusion spring is fixedly connected with the inner wall of the U-shaped frame, and the other end of the extrusion spring is fixedly connected with the top outer wall of the sliding block, the movable roller is located directly above the fixed roller, one side outer wall of the U-shaped frame is fixedly installed with a motor II, and the output shaft of the motor II penetrates through the U-shaped frame and is fixedly connected with one end of the fixed roller.

[0013] From the above, the multi-station round digital printer in the present application has the following features and advantages: The device can preinstall multiple paper rolls through multi-station layout. When the current paper roll is exhausted, it does not need to stop, but only needs to drive the wheel disc frame to rotate through the driving device, so that it can quickly switch to the standby paper roll with full paper. At the same time, with the automatic connection of the air suction assembly and the auxiliary traction assembly, the new paper roll can be quickly adsorbed, towed and fed, and the whole process does not need manual intervention for disassembly or tension adjustment. This design completely solves the problem of downtime caused by paper roll replacement in traditional equipment, significantly reduces idle time, ensures continuous paper supply, and greatly improves overall production efficiency in batch production scenarios.

[0014] The device only needs to preinstall and fix multiple paper rolls through the clamp jaw assembly in the early preparation stage, and the subsequent paper roll replacement and feeding are automatically controlled by the system. From multi-station switching, paper adsorption, to traction docking of the printer body, all are accurately executed through the preset program without manual intervention for disassembly or parameter adjustment. This not only simplifies the operation process and reduces labor intensity, but also avoids problems such as paper deviation and uneven tension caused by human operation differences, improving the stability and consistency of equipment operation.

[0015] The device ensures paper conveying and printing quality through multiple designs. On the one hand, the tensioning assembly can automatically form stable tension during paper preinstallation and can be self-adaptively adjusted through elastic structure to avoid paper relaxation or excessive stretching. On the other hand, the air suction assembly realizes accurate paper grabbing through negative pressure adsorption, and the auxiliary traction assembly ensures smooth paper clamping and traction through elastic roller body cooperation. The whole feeding process keeps the paper flat and stable in tension, and it can accurately enter the feeding end when docking the printer body. This design effectively avoids paper wrinkling and deviation during conveying, ensuring stable printing quality. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is the overall schematic diagram of the present application; Figure 2 is Figure 1 the enlarged schematic diagram of structure A in the present application; Figure 3 is the structural schematic diagram of the wheel disc frame and multiple paper rolls in the present application; Figure 4 is Figure 3 the enlarged schematic diagram of structure B in the present application; Figure 5 is the structural schematic diagram of the tensioning assembly in the present application; Figure 6 is the structural schematic diagram above the rack in the present application; Figure 7is the structural schematic view of the air suction assembly and the auxiliary traction assembly in the application; Figure 8 is the structural schematic view of the auxiliary traction assembly in the application.

[0017] In the application, the reference signs are as follows: 1, rack; 2, printing machine body; 3, bearing frame; 4, wheel disc frame; 5, paper roll; 9, direct drive module; 10, driving device; Clamping jaw assembly: 41, mounting plate; 42, rotating part; 43, clamping jaw; 44, connecting rod; 45, speed reduction motor; Tensioning assembly: 61, main arm; 611, main tensioning roller; 612, traction block one; 613, tension spring one; 62, auxiliary arm; 621, auxiliary tensioning roller; 622, traction block two; 623, tension spring two; Air suction assembly: 71, stand; 72, electric push rod; 73, air suction cover; 74, motor one; 75, vacuum pump; Auxiliary traction assembly: 81, U-shaped frame; 82, movable roller; 83, fixed roller; 84, sliding block; 85, extrusion spring; 86, motor two. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the application will be described clearly and completely below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0019] Referring to Figures 1-8 As shown in the drawings, the multi-station wheel digital printer provided in the embodiments of the application will be described in detail as follows: Referring to Figure 1As shown, a multi-station round digital printer includes a rack 1 as a device base support, the top outer wall of which is fixedly installed with a printer body 2 by bolts, the print head of the printer body 2 faces the rotating path of a subsequent wheel disc rack 4, ensuring that the paper roll on the wheel disc rack 4 can be accurately docked with the printing station, which is not described in detail as prior art, the top outer wall of the rack 1 is also fixedly installed with a plurality of bearing racks 3 by bolts, the inner ring of the bearing rack 3 is interference-fitted with the shaft of the wheel disc rack 4, realizing the stable rotation of the wheel disc rack 4 around the bearing rack 3; the outer wall of one of the bearing racks 3 is fixedly installed with a driving device 10 by a support, the output shaft of the driving device 10 is fixedly connected with the shaft of the wheel disc rack 4 through a shaft coupling, the driving device 10 can drive the wheel disc rack 4 to rotate in the circumferential direction when it is started, the driving device 10 is an integrated combination structure of a reducer and a motor, the motor specifically adopts a stepping motor, and the transmission structure inside the reducer is a worm and gear transmission: the output shaft of the stepping motor is fixedly connected with the worm input end of the reducer through a shaft coupling, and the worm wheel output end of the reducer is fixedly connected with the shaft of the wheel disc rack 4 through a shaft coupling, which is not described in detail as prior art; On the one hand, the worm and gear transmission has a natural self-locking characteristic, when the stepping motor stops running, the worm wheel cannot rotate reversely under the restriction of the worm, thereby locking the position of the wheel disc rack 4, avoiding the wheel disc rack 4 from being deviated due to its own gravity or paper tension, and ensuring that each station is accurately aligned with the air suction assembly, the auxiliary traction assembly and the feeding end of the printer body 2; on the other hand, the stepping motor can accurately control the rotation angle (such as the angular interval corresponding to each station each time) according to the pulse signal sent by the PLC controller, and cooperate with the speed reduction ratio of the worm and gear transmission, further improving the rotation accuracy of the wheel disc rack 4, realizing accurate positioning when switching between multiple stations, avoiding the misalignment of paper conveying or printing deviation caused by station deviation, when the driving device 10 is started, the stepping motor drives the worm to rotate, the worm drives the worm wheel to rotate, and finally drives the wheel disc rack 4 to rotate stably and accurately in the circumferential direction.

[0020] Further, please refer to Figure 4As shown, the two side walls of the wheel disc frame 4 are welded or bolted with multiple sets of mounting plates 41 of the clamping jaw assembly at equal intervals in the circumferential direction, and each two sets of clamping jaw assemblies are oppositely arranged to correspond to clamping two ends of a paper roll 5. In the clamping jaw assembly, two rotating members 42 are symmetrically connected to the outer wall of the mounting plate 41 through a pin shaft, and the gear parts of the two rotating members 42 are meshed with each other. The clamping jaw 43 is connected to the end of the rotating member 42 away from the mounting plate 41 through a pin shaft. The middle segment of the outer wall of the two clamping jaws 43 is connected to the connecting rod 44 through a shaft pin. The end of the connecting rod 44 away from the clamping jaw 43 is rotatably connected to the outer wall of the mounting plate 41, forming a linkage opening and closing structure. The output shaft of the speed reducer motor 45 is fixedly connected to the shaft of one of the rotating members 42 through a flat key. When the speed reducer motor 45 operates, it can drive the rotating member 42 to rotate, and through the gear meshing and linkage with the connecting rod 44, the synchronous opening and closing of the two clamping jaws 43 are realized, thereby clamping or loosening the paper roll 5. It should be noted that the speed reducer motor 45 is internally provided with a self-locking transmission structure, which can realize self-locking function while driving the rotating member 42 to rotate, so as to ensure that the two clamping jaws 43 can stably clamp the shaft of the paper roll 5. This is a prior art and will not be described in more detail. Further, it should be noted that a bearing structure should be provided between the paper wound on the paper roll 5 and the shaft to enable the paper to rotate around the shaft on the paper roll 5, avoiding the situation that the shaft of the paper roll 5 cannot be rotated after being clamped by the clamping jaw assembly, affecting the normal unwinding of the paper. This is a prior art and will not be described in more detail.

[0021] Further, please refer to Figure 5 As shown, the two side walls of the wheel disc frame 4 are welded or bolted with multiple sets of mounting plates 41 of the clamping jaw assembly at equal intervals in the circumferential direction, and each two sets of clamping jaw assemblies are oppositely arranged to correspond to clamping two ends of a paper roll 5. In the clamping jaw assembly, two rotating members 42 are symmetrically connected to the outer wall of the mounting plate 41 through a pin shaft, and the gear parts of the two rotating members 42 are meshed with each other. The clamping jaw 43 is connected to the end of the rotating member 42 away from the mounting plate 41 through a pin shaft. The middle segment of the outer wall of the two clamping jaws 43 is connected to the connecting rod 44 through a shaft pin. The end of the connecting rod 44 away from the clamping jaw 43 is rotatably connected to the outer wall of the mounting plate 41, forming a linkage opening and closing structure. The output shaft of the speed reducer motor 45 is fixedly connected to the shaft of one of the rotating members 42 through a flat key. When the speed reducer motor 45 operates, it can drive the rotating member 42 to rotate, and through the gear meshing and linkage with the connecting rod 44, the synchronous opening and closing of the two clamping jaws 43 are realized, thereby clamping or loosening the paper roll 5. It should be noted that the speed reducer motor 45 is internally provided with a self-locking transmission structure, which can realize self-locking function while driving the rotating member 42 to rotate, so as to ensure that the two clamping jaws 43 can stably clamp the shaft of the paper roll 5. This is a prior art and will not be described in more detail. Further, it should be noted that a bearing structure should be provided between the paper wound on the paper roll 5 and the shaft to enable the paper to rotate around the shaft on the paper roll 5, avoiding the situation that the shaft of the paper roll 5 cannot be rotated after being clamped by the clamping jaw assembly, affecting the normal unwinding of the paper. This is a prior art and will not be described in more detail.

[0022] Further, please refer to Figure 6 With 7As shown, the stand 71 of the air suction assembly is fixed on the top outer wall of the frame 1 between the wheel disc frame 4 and the printing machine body 2 by bolts, and the inner walls of the two sides of the stand 71 are rotatably connected to the cylinder bodies of the two electric push rods 72 by pin shafts, and the rod ends of the two electric push rods 72 are fixedly connected to the two outer walls of the air suction cover 73 by bolts; the vacuum pump 75 is fixed on the top outer wall of the frame 1 by a support, and its suction end is communicated with the inner cavity of the air suction cover 73 through a flexible connecting pipe, so that a negative pressure is formed in the air suction cover 73 when the vacuum pump 75 is started; one side outer wall of the stand 71 is fixed with a motor one 74 by bolts, and the output shaft of the motor one 74 is fixedly connected to the pin shafts of the electric push rods 72 through a coupling after penetrating through the side wall of the stand 71, so that the electric push rods 72 can be driven to rotate around the pin shafts when the motor one 74 is operated, thereby adjusting the angle and height of the air suction cover 73 to adapt to the paper roll suction requirements at different positions. Further, referring to Figure 8 As shown, the two groups of direct drive modules 9 of the auxiliary traction assembly are fixed on the top outer wall of the frame 1 between the air suction assembly and the printing machine body 2 by bolts; the two outer walls of the U-shaped frame 81 are fixed on the moving ends of the two groups of direct drive modules 9 by bolts, so that the U-shaped frame 81 can be driven to move in the horizontal direction when the direct drive modules 9 are operated; the two ends of the fixed roller 83 are rotatably connected to the two inner walls of the U-shaped frame 81 by bearings, and the two ends of the movable roller 82 are rotatably connected with the sliding blocks 84, and the two sliding blocks 84 are respectively slidably embedded in the sliding grooves in the two inner walls of the U-shaped frame 81; the top of the two inner walls of the U-shaped frame 81 is welded with a spring seat, the top end of the compression spring 85 is fixed on the spring seat, and the bottom end is fixed on the top outer wall of the sliding block 84, so that the movable roller 82 is always in close contact with the fixed roller 83 through the elastic force of the compression spring 85; one side outer wall of the U-shaped frame 81 is fixed with a motor two 86 by bolts, and the output shaft of the motor two 86 is fixedly connected to one end of the fixed roller 83 through a flat key after penetrating through the side wall of the U-shaped frame 81, so that the fixed roller 83 can be driven to rotate when the motor two 86 is operated, and the traction and conveying of the paper roll are realized by cooperating with the movable roller 82.

[0023] It should be noted that each of the above driving components is connected with a PLC controller in the external control system; the PLC controller is electrically connected with the driving device 10, the speed reducer motor 45, the electric push rod 72, the vacuum pump 75, the motor one 74, the direct drive module 9, the motor two 86 and the printing machine body 2 through wires to realize power supply and signal transmission of each component, and the operator can input control instructions through the man-machine interface or can real-time view the running state of each component, which will not be described in detail.

[0024] The implementation principle of the multi-station round digital printer is as follows: first, an operator carries multiple paper roll 5 (which is pre-wrapped with the paper to be printed) to the wheel rack 4, sends a "claw 43 loosening" instruction through the man-machine interface, and after the PLC controller receives the instruction, controls the synchronous action of multiple sets of claw assemblies on the outer walls of the wheel rack 4: the speed reducer motor 45 is operated to drive the rotating part 42 connected thereto to rotate, since the two rotating parts 42 are interlocked and form a linkage structure through the connecting rod 44, when one rotating part 42 rotates, it will drive the other rotating part 42 to rotate in the opposite direction, and finally make the two claws 43 open synchronously; The operator places the two ends of a single paper roll 5 between the two sets of claws 43 arranged on the two sides of the wheel rack 4, confirms the position, and then sends a "claw 43 clamping" instruction through the man-machine interface, the speed reducer motor 45 is reversed to drive the rotating part 42 and the claw 43 to reset and close, until the claw 43 tightly fits the outer wall of the end of the paper roll 5, realizing the rapid fixation of the paper roll 5, repeating the above operation, the multiple paper rolls 5 are fixed on the circumferential stations of the wheel rack 4 one by one, and the pre-installation of the paper roll 5 is completed; For each fixed paper roll 5, the operator manually pulls the free end of the paper on the paper roll 5 out and drags it to the tensioning assembly at the corresponding station according to the preset path: first, the paper is wound around the lower side of the main tensioning roller 611, and then pulled upwards to the upper side of the auxiliary tensioning roller 621, so that the paper is in the form of "lower winding and upper wrapping" and is attached to the outer wall of the main tensioning roller 611 and the auxiliary tensioning roller 621; During the pulling process, a section of paper (length satisfying the subsequent adsorption requirement) extending out of the side of the auxiliary tensioning roller 621 away from the main tensioning roller 611 is reserved as the "pulling end" for the subsequent suction assembly to adsorb; At this time, the tensioning assembly automatically enters the working state: the main arm 61 is driven by the tension of the first tension spring 613 to slightly offset the main tension roller 611 towards the wheel disc frame 4, and the secondary arm 62 is driven by the tension of the second tension spring 623 to slightly offset the secondary tension roller 621 away from the main tension roller 611, both of which cooperate to form a continuous tension on the paper roll; if the paper roll is slightly relaxed or stretched, the first tension spring 613 and the second tension spring 623 will automatically adjust the angle of the main arm 61 and the secondary arm 62 through elastic deformation, and then adjust the relative position of the main tension roller 611 and the secondary tension roller 621, to ensure that the paper roll is always in a stable tension state, avoiding wrinkles or excessive stretching of the paper roll, completing the pretreatment of the paper roll. It should be noted that the core function of the first tension spring 613 and the second tension spring 623 is to provide a tensioning pre-tightening force, and the size of the pre-tightening force is directly determined by the spring force coefficient (stiffness coefficient) - the smaller the spring force coefficient, the smaller the tension generated by the spring under the same deformation, and the weaker the tension on the paper roll; on the contrary, the tension is stronger, so different spring force coefficients can be selected according to the material, thickness, tensile strength and other characteristics of the paper roll. The above springs are connected by hanging, so they can be replaced: Adapt to thin / low tensile strength paper roll (such as thin label paper, thermal paper): select the first tension spring 613 and the second tension spring 623 with smaller spring force coefficient, for example, for thin paper that is easy to break, the spring force coefficient can be controlled in a lower range to ensure that the tension generated by the spring under natural deformation (when the paper roll is normally conveyed) can only offset the relaxation tendency of the paper roll, and will not cause the paper roll to stretch or break due to excessive tension; even if the paper roll is slightly stretched due to fluctuation in conveying speed, the spring will generate a smaller counterforce due to the small spring force coefficient, avoiding excessive pulling; Adapt to thick / high tensile strength paper roll (such as packaging paper, advertising roll material): select the first tension spring 613 and the second tension spring 623 with larger spring force coefficient, such paper roll has high strength and high tensile resistance, and requires more tension to avoid relaxation and wrinkles during conveying, and the spring with larger spring force coefficient can provide sufficient tension under normal deformation to ensure that the paper roll is always in a stable tension state, and the high tensile strength of the paper roll will not cause excessive stretching; When the device completes the preliminary installation and pretreatment, or the paper roll of the current working paper roll 5 is exhausted, the system automatically triggers the feeding process to realize multi-station precise switching of the wheel disc frame 4 through the driving device 10: If it is the first start of the device, the PLC controller triggers the first paper roll 5 by default; if it is a switch after the paper roll is exhausted, the PLC controller detects the paper conveying speed at the feeding end of the printing machine body 2 (the speed drops below the preset threshold) or the tension change of the tensioning assembly (the tension drops suddenly), judges that the current paper roll 5 is exhausted, automatically generates a "station switching" instruction, and prompts the operator through the man-machine interface (non-essential intervention). This is not described in detail in the prior art; The PLC controller sends a station switching signal to the driving device 10, and the stepping motor of the driving device 10 starts after receiving the pulse command, and drives the worm of the speed reducer to rotate at a preset speed; due to the worm and gear transmission structure inside the speed reducer, the worm drives the worm gear to rotate synchronously when the worm rotates, and then drives the wheel frame 4 connected to the output end of the worm gear to rotate slowly around the shaft of the bearing frame 3; The stepping motor accurately controls the number of rotations by receiving the pulse signal of the PLC controller. For example, when the wheel frame 4 is evenly distributed with 3 stations, the stepping motor needs to drive the wheel frame 4 to rotate 120° (360° / 3), so that the next paper roll 5 to be fed can be rotated to the "feeding station" opposite the air suction assembly; when the wheel frame 4 reaches the specified position, the PLC controller stops sending pulse signals, and the stepping motor stops running. At this time, the self-locking function of the worm and gear transmission is effective - the worm cannot be driven in reverse, and the wheel frame 4 is firmly locked in the current position, ensuring that the station does not shift during subsequent adsorption and traction, and completing multi-station switching; After the wheel frame 4 is switched to the position, the air suction assembly starts, and the reserved traction end of the paper roll is stably grabbed and conveyed to the vicinity of the auxiliary traction assembly through precise adjustment and negative pressure adsorption: The PLC controller sends a start command to motor one 74, and the motor one 74 runs, its output shaft drives the rotating shaft of the electric push rod 72 to rotate around the inner wall of the vertical frame 71, and then adjusts the inclination angle of the electric push rod 72 as a whole. At the same time, the PLC controller sends a telescopic command to the electric push rod 72, and the piston rod of the electric push rod 72 telescopes along the cylinder body, driving the fixed air suction cover 73 to move up and down. Through the coordinated action of motor one 74 and electric push rod 72, the adsorption end face of the air suction cover 73 gradually approaches the reserved traction end of the paper roll, and finally makes the adsorption end face of the air suction cover 73 parallel to the traction end of the paper roll, and the distance is controlled within the adsorbable range (to ensure that the negative pressure can effectively act on the surface of the paper roll), avoiding the collision between the air suction cover 73 and the paper roll, which may cause the paper roll to shift, or the distance being too large, which may cause the adsorption to fail; When the air suction cover 73 is adjusted to the position, the PLC controller starts the vacuum pump 75, which quickly extracts the air in the inner cavity of the air suction cover 73 through the flexible connecting pipe, so that the adsorption end face of the air suction cover 73 forms a negative pressure area. Under the action of the external atmospheric pressure, the reserved traction end of the paper roll is firmly adsorbed on the adsorption end face of the air suction cover 73, realizing the stable grabbing of the paper roll; Subsequently, the PLC controller controls the motor 74 and the electric push rod 72 to act again: the motor 74 drives the electric push rod 72 to rotate reversely, and the piston rod of the electric push rod 72 synchronously shrinks, and the two cooperate to drive the air suction cover 73 to move towards the auxiliary traction assembly until the traction end of the paper roll approaches the gap between the movable roller 82 and the fixed roller 83 of the auxiliary traction assembly. At this time, the PLC controller suspends the action of the motor 74 and the electric push rod 72, and keeps the position of the air suction cover 73 stable, to prepare for the subsequent handover of the paper roll to the auxiliary traction assembly. It is worth noting that when the air suction cover 73 pulls the traction end of the paper roll close to the movable roller 82 and the fixed roller 83, the position of the air suction cover 73 on the paper roll should move close to the end of the paper roll, to ensure that the traction end of the paper roll is not too long, so that the traction end of the paper roll does not collapse and thus cannot enter between the movable roller 82 and the fixed roller 83; After the air suction assembly delivers the traction end of the paper roll to the designated position, the auxiliary traction assembly starts to realize the clamping and preliminary traction of the paper roll through the cooperation of the roller body and the friction force: At this time, the traction end of the paper roll is located in front of the movable roller 82 and the fixed roller 83. The PLC controller sends a start instruction to the motor 86, and the motor 86 operates, and its output shaft drives the fixed roller 83 to rotate around its own axis (the rotation direction is consistent with the traction direction of the paper roll). At the same time, the movable roller 82 moves downward along the sliding groove of the U-shaped frame 81 under the elastic force of the compression spring 85, so that the outer wall of the movable roller 82 tightly fits the outer wall of the fixed roller 83, forming an "elastic clamping" state.

[0025] When the fixed roller 83 rotates, friction is generated between its outer wall and the outer wall of the movable roller 82, driving the movable roller 82 to rotate reversely with the fixed roller 83. When the traction end of the paper roll contacts the rotating fixed roller 83 and movable roller 82, it is gradually wound into the gap between the two rollers under the action of friction. Since the movable roller 82 is always pressed downward by the compression spring 85, the two rollers form a stable clamping force on the paper roll, ensuring that the paper roll does not slip or fall off during traction. It should be noted that the outer walls of the movable roller 82 and the fixed roller 83 are provided with rubber layers to increase the friction; The PLC controller controls the rotation of the fixed roller 83 and the movable roller 82 to the traction end of the paper roll passing through the gap between the two rollers and exposing a small section (the length meets the subsequent requirement of abutting the feed end of the printing machine body 2) by presetting the rotation time (or rotation number) of the motor 86. Then the PLC controller stops the operation of the motor 86. At this time, the movable roller 82 and the fixed roller 83 still maintain the clamping state of the paper roll to prevent the paper roll from returning, completing the connection and clamping of the paper roll; After the auxiliary traction assembly completes the clamping of the paper roll, the paper roll is abutted to the printing machine body 2 through the movement of the direct drive module 9, realizing automatic feeding and then starting continuous printing: The PLC controller turns off the vacuum pump 75, and the negative pressure in the inner cavity of the suction hood 73 disappears, and the paper roll is separated from the suction hood 73; at the same time, the PLC controller starts the two groups of direct drive modules 9, and the moving end of the direct drive module 9 drives the U-shaped frame 81 to horizontally advance towards the printing machine body 2. Since the movable roller 82 and the fixed roller 83 are still clamping the paper roll, when the U-shaped frame 81 advances, it synchronously drives the exposed end of the paper roll to move towards the feeding end of the printing machine body 2.

[0026] When the end of the paper roll reaches between the two groups of traction rollers at the feeding end of the printing machine body 2, the PLC controller controls the direct drive module 9 to stop advancing, and the butt joint of the paper roll and the printing machine body 2 is completed; at this time, the control system of the printing machine body 2 detects the paper roll signal and automatically starts the two groups of traction rollers at the feeding end, the traction rollers rotate and pull the end of the paper roll into the inside of the printing machine body 2, realizing automatic feeding of the paper roll; After the paper roll enters the printing machine body 2, the printing machine body 2 starts the printing operation according to the preset parameters; at the same time, the PLC controller controls the direct drive module 9 to drive the U-shaped frame 81 to reset to the initial position. It should be noted that when the direct drive module 9 drives the U-shaped frame 81 to reset, the external PLC controller automatically controls the motor two 86 to reverse rotation according to the moving speed of the direct drive module 9 driving the U-shaped frame 81, that is, the motor two 86 drives the fixed roller 83 to turn along the reset moving path of the U-shaped frame 81, thereby avoiding the U-shaped frame 81 from moving back due to friction when resetting, and the motor one 74 and the electric push rod 72 of the suction assembly drive the suction hood 73 to reset, preparing for the next feeding; When the paper roll of the current paper roll roller 5 is about to be exhausted, the PLC controller repeats the above-mentioned process of “multi-station switching-suction adsorption-assisted traction-automatic feeding”: the driving device 10 drives the wheel disc frame 4 to rotate, switches the next paper roll roller 5 to be fed to the working station, and the suction assembly and the auxiliary traction assembly cooperate to complete the paper roll handover, and the printing machine body 2 continuously receives the paper roll for printing, realizing continuous printing cycle without manual intervention.

[0027] It should be noted that in this paper, relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between the entities or operations. Moreover, the terms “include”, “contain” or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or equipment. Without more limitations, the element defined by the statement “including a…” does not exclude the presence of other identical elements in the process, method, article or equipment including the element.

[0028] While embodiments of the application have been shown and described, it is to be understood that the embodiments described are merely exemplary of the principles and application of the present application. Numerous modifications and adaptions can be effected without departing from the spirit and scope of the present application, which is not limited to the exact construction and arrangement described. It is intended, therefore, to cover all modifications and adaptions that fall within the scope of the claims and their equivalents.

Claims

1. A multi-station rotary digital printer comprising a frame (1), characterized in that: The top outer wall of the frame (1) is provided with a printing body (2), the top outer wall of the frame (1) is rotatably connected with a wheel disc frame (4) through a bearing frame (3), the outer wall of the wheel disc frame (4) is provided with a plurality of paper roll (5) through a plurality of groups of jaw assemblies, the outer wall of one of the bearing frame (3) is fixedly provided with a driving device (10), the output shaft of the driving device (10) is fixedly connected with the shaft of the wheel disc frame (4), every two groups of the jaw assemblies are correspondingly arranged at the outer walls of the two sides of the wheel disc frame (4) at equal intervals, the outer wall of the wheel disc frame (4) is further provided with a plurality of groups of tensioning assemblies, and the plurality of groups of the tensioning assemblies correspond to the plurality of paper roll (5). The upper portion of the frame (1) is provided with an air suction assembly and an auxiliary traction assembly, and the air suction assembly and the auxiliary traction assembly are located between the wheel disc frame (4) and the printing body (2).

2. A multi-station rotary digital printer according to claim 1, wherein: The jaw assembly comprises a mounting plate (41), two rotating members (42), two jaws (43) and a speed reducer motor (45), the mounting plate (41) is fixedly connected with the outer wall of the wheel disc frame (4), the two rotating members (42) are symmetrically rotatably connected with the outer wall of the mounting plate (41) and are engaged with each other, and the jaw (43) is rotatably connected with the end of the rotating member (42).

3. A multi-station rotary digital printer according to claim 2, wherein: The outer wall of the middle section of the two jaws (43) is rotatably connected with a connecting rod (44), one end of the connecting rod (44) away from the jaw (43) is rotatably connected with the outer wall of the mounting plate (41), and the speed reducer motor (45) is fixedly installed on the outer wall of the mounting plate (41), and the output shaft thereof is fixedly connected with the outer wall of the shaft of one of the rotating members (42).

4. A multi-station rotary digital printer according to claim 1, wherein: The tensioning assembly comprises two main arms (61) and two auxiliary arms (62), the two main arms (61) are rotatably connected with the outer walls of the two sides of the wheel disc frame (4), the two auxiliary arms (62) are rotatably connected with the outer walls of the two main arms (61), the ends of the two main arms (61) are rotatably connected with main tensioning rollers (611), the ends of the two auxiliary arms (62) are rotatably connected with auxiliary tensioning rollers (621), and the auxiliary tensioning rollers (621) are located above the main tensioning rollers (611).

5. A multi-station rotary digital printer according to claim 4, wherein: The tensioning assembly further comprises two tensioning springs I (613) and two tensioning springs II (623), one end of the outer wall of the main arm (61) away from the main tensioning roller (611) is fixedly connected with a traction block I (612), one end of the tensioning spring I (613) is hung on the outer wall of the traction block I (612), the other end of the tensioning spring I (613) is hung on the outer wall of the wheel disc frame (4), one end of the outer wall of the auxiliary arm (62) away from the auxiliary tensioning roller (621) is fixedly connected with a traction block II (622), one end of the tensioning spring II (623) is hung on the outer wall of the traction block II (622), and the other end of the tensioning spring II (623) is hung on the outer wall of the main arm (61).

6. A multi-station rotary digital printer according to claim 1, wherein: The air suction assembly includes a stand (71), two electric push rods (72), an air suction cover (73) and a vacuum pump (75), the stand (71) is fixedly connected to the top outer wall of the rack (1), the two electric push rods (72) are rotatably connected to the inner walls on the two sides of the stand (71) through shafts, and the air suction cover (73) is fixedly installed on the output ends of the two electric push rods (72).

7. A multi-station rotary digital printer according to claim 6, wherein: The vacuum pump (75) is fixedly installed on the top outer wall of the rack (1), the suction end of the vacuum pump (75) is connected with the inner cavity of the air suction cover (73) through a connecting pipe, and a first motor (74) is further fixedly installed on one side outer wall of the stand (71); the output shaft of the first motor (74) penetrates through the stand (71) and is fixedly connected to one end of the shaft.

8. A multi-station rotary digital printer according to claim 1, wherein: The auxiliary traction assembly includes two groups of direct drive modules (9), a U-shaped frame (81), movable rollers (82) and fixed rollers (83), the U-shaped frame (81) is fixedly installed on the outer walls of the two groups of direct drive modules (9), the two groups of direct drive modules (9) are fixedly installed on the top outer wall of the rack (1), the fixed rollers (83) are rotatably connected to the inner walls on the two sides of the U-shaped frame (81), and the movable rollers (82) are rotatably connected with sliding blocks (84) at two ends; the sliding blocks (84) are slidably connected to the inner walls on the two sides of the U-shaped frame (81).

9. A multi-station carousel digital printer according to claim 8, wherein: The inner walls on the two sides of the U-shaped frame (81) are provided with extrusion springs (85), the top end of the extrusion spring (85) is fixedly connected to the inner wall of the U-shaped frame (81), the other end of the extrusion spring (85) is fixedly connected to the top outer wall of the sliding block (84), the movable roller (82) is located directly above the fixed roller (83), one side outer wall of the U-shaped frame (81) is fixedly installed with a second motor (86), and the output shaft of the second motor (86) penetrates through the U-shaped frame (81) and is fixedly connected to one end of the fixed roller (83).

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