An on-line sizing and printing device for digital printing machines

Abstract

The present invention belongs to the technical field of sizing printing, and discloses an on-line sizing printing device for a digital printing machine capable of filling gaps with sizing slurry, including a printing frame. A filter press roller is arranged inside the printing frame, and a sizing cylinder is rotatably sleeved inside the filter press roller. The front end of the sizing cylinder penetrates through the filter press roller and is fixedly sleeved inside the printing frame. A slurry spraying groove is formed below the sizing cylinder surface near the incoming material side. Two piston assemblies are hermetically sleeved inside the sizing cylinder, one in the front and the other in the back. Through the filter press roller, the present invention can ensure that the internal sizing cylinder and the slurry spraying groove can directly spray the solid-liquid slurry onto the printing fabric. Furthermore, through the slurry spraying groove, it can ensure that the color fixing slurry inside the sizing cylinder can be sprayed onto the fabric along the expected direction without being affected by the continuous rotation of the filter press roller. At the same time, it is convenient for the subsequent slurry to be roller-pressed by the continuously rotating filter press roller to make it evenly applied.

Description

Technical Field

[0001] The present invention belongs to the technical field of sizing printing, and specifically relates to an on-line sizing printing device for a digital printing machine. Background Art

[0002] Before digital printing, it is necessary to coat a sizing liquid on the fabric. The purpose is to coat the auxiliaries required for color fixation on the fabric. During the subsequent digital printing process, the sizing on the fabric surface can react with the ink ejected from the digital printing nozzle and fix the color to form the pattern of digital printing. Therefore, it is necessary to use a sizing device to spray the fabric before printing. Although the sizing devices in the prior art can also meet the requirements, since the sizing coverage of the sizing equipment used in different processes is fixed, in order to ensure full and comprehensive coating of the sizing liquid on the fabric, it is necessary to replace a sufficiently long sizing device, which not only increases the use cost of the equipment, but also increases the labor intensity of the operator. More importantly, the length of the sizing application roller replaced each time is usually difficult to exactly match the width of the fabric, and it often exceeds the width size of the fabric. In this way, the sizing roller that extends beyond the fabric will continuously eject the sizing liquid during operation, but this part of the sizing roller surface does not contact the fabric, so it will cause great waste of the sizing liquid.

[0003] Therefore, it is necessary to develop a new type of sizing device for a digital printing machine that is convenient for adjusting the sizing range. Summary of the Invention

[0004] The purpose of the present invention is to provide an on-line sizing printing device for a digital printing machine to solve the problems raised in the above background art.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An on-line sizing printing device for a digital printing machine, including a printing frame. A filter press roller is arranged inside the printing frame. A sizing cylinder is rotatably sleeved inside the filter press roller. The front end of the sizing cylinder penetrates through the filter press roller and is fixedly sleeved inside the printing frame. A slurry spraying groove is opened below the sizing cylinder surface near the incoming material side. Two piston assemblies are hermetically sleeved inside the sizing cylinder. The outer surface of each piston assembly is hermetically fitted with the inside of the slurry spraying groove. A lead screw is threadedly sleeved inside the piston assembly. The front end of the lead screw penetrates through the piston assembly, the sizing cylinder and the filter press roller and extends to the front of the printing frame and is fixedly connected to a slurry inlet pipe. A regulation turntable is fixedly sleeved on the outside of the lead screw between the printing frame and the slurry inlet pipe. A slurry replenishing hole is opened on the front surface of the lead screw. One end of the slurry replenishing hole communicates with the slurry inlet pipe, and the other end of the slurry replenishing hole extends to the middle of the lead screw and between the opposite surfaces of the two piston assemblies and communicates with the inside of the sizing cylinder.

[0006] Preferably, each of the piston assemblies includes a sealing sleeve that is sealingly sleeved inside the sizing cylinder and the slurry spraying tank. Inside each of the sealing sleeves, a partition plate is fixedly sleeved. Inside each of the partition plates, a rotary sealing sleeve is fixedly sleeved. The rotary sealing sleeve is threadedly sleeved outside the lead screw. The two rotary sealing sleeves move towards or away from each other under the action of the lead screw.

[0007] Preferably, inside the printing frame, a dust removal roller is provided on the side close to the incoming material direction outside the filter press roller. The outer surface of the dust removal roller is in close contact with the filter press roller. A dust unloading groove is formed on the outer surface of the dust removal roller. A positioning rod is movably sleeved inside the dust unloading groove. Both ends of the positioning rod are movably connected to the printing frame.

[0008] Preferably, inside the printing frame, a rotating rod is provided on the side close to the incoming material outside the dust removal roller. A vibrating bar is provided outside the rotating rod. A transmission rod is fixedly sleeved inside the rotating rod. The front end of the transmission rod is movably connected to the printing frame. The rear end of the transmission rod penetrates through the rotating rod and extends to the rear of the printing frame and is fixedly connected to a transmission mechanism.

[0009] Preferably, the transmission mechanism includes a first belt pulley and a second belt pulley provided on the back of the printing frame. The outer diameter of the first belt pulley is larger than the outer diameter of the second belt pulley. A transmission belt is connected between the first belt pulley and the second belt pulley. The second belt pulley is fixedly connected to the transmission rod. A driving shaft is fixedly sleeved inside the first belt pulley. One end of the driving shaft extends into the printing frame and is fixedly connected to the filter press roller. The other end of the driving shaft is fixedly connected to the output shaft of the driving motor.

[0010] Preferably, two left and right side guide rollers are provided inside the printing frame on the outside of the filter press roller, the dust removal roller and the rotating rod. Limiting grooves are formed on both the left and right sides of the printing frame on the front and rear sides of the guide rollers. An activity frame is movably sleeved inside each of the guide rollers. Both ends of the activity frame penetrate through the guide rollers and extend to the front and rear sides of the printing frame and are fixedly connected to a tension buffer assembly.

[0011] Preferably, the tops of the front and rear tension buffer assemblies connected to both ends of the same activity frame are fixedly connected to an activity frame. A limiting and fixing frame fixedly connected to the inside of the printing frame is provided at the bottom of the activity frame. A lead screw is threadedly sleeved inside the limiting and fixing frame. Both ends of the lead screw penetrate through the limiting and fixing frame. The upper end of the lead screw penetrates through the activity frame and is fixedly connected to a knob. The lead screw is rotationally clamped inside the activity frame.

[0012] Preferably, the tension buffer assembly includes a lower connecting frame connected to either the front or the rear end of the movable frame and an upper connecting frame connected to either the front or the rear end of the movable frame. A limiting slide rod is movably sleeved inside the lower connecting frame. Both ends of the limiting slide rod penetrate through the lower connecting frame. The top of the limiting slide rod is fixedly connected to the upper connecting frame. A tension buffer spring is arranged outside the limiting slide rod and located between the lower connecting frame and the upper connecting frame.

[0013] Preferably, the bottoms of the dust removal roller and the filter pressing roller are on the same horizontal plane. The top of the guiding roller is higher than the bottoms of the dust removal roller or the filter pressing roller. The top of the rotating rod is located between the top of the guiding roller and the top of the filter pressing roller or the dust removal roller.

[0014] Preferably, the outer surfaces of the filter pressing roller, the dust removal roller, the rotating rod and the guiding roller are connected by a printing fabric. The printing fabric passes through the top of one of the guiding rollers, the top of the rotating rod, the bottom of the dust removal roller and the bottom of the filter pressing roller in sequence and is output from the top of the other guiding roller.

[0015] The beneficial effects of the present invention are as follows:

[0016] 1. First, through the slurry inlet pipe and the lead screw, the solid-liquid slurry can be continuously injected into the inside of the sizing cylinder, and it is ensured that the slurry always enters between the opposite surfaces of the two piston assemblies. By rotating and adjusting the turntable, the two piston assemblies can be driven by the lead screw. The movement of the two piston assemblies is restricted by the sizing cylinder and the slurry spraying groove. Therefore, the continuous rotation of the lead screw can drive the two piston assemblies to move towards or away from each other, so that the distance between the opposite surfaces of the two piston assemblies inside the filter pressing roller can be changed, making the width of the slurry sprayed at the slurry spraying groove match the width of the fabric.

[0017] 2. Through the filter pressing roller, it can be ensured that the sizing cylinder and the slurry spraying groove inside can directly spray the solid-liquid slurry onto the printing fabric. Then, through the slurry spraying groove, it can be ensured that the fixing slurry inside the sizing cylinder can be sprayed onto the fabric along the expected direction and is not affected by the continuous rotation of the filter pressing roller. At the same time, it is convenient for the subsequent slurry to be roller-pressed by the continuously rotating filter pressing roller to make it evenly coated.

[0018] 3. Through the transmission mechanism, the vibrating bar can rotate continuously and quickly following the rotating rod to shake off the dust on the fabric surface so that it no longer adheres to the fabric surface. The rotation of the filter pressing roller can be ensured to continuously drive the dust removal roller to rotate through the restriction of the positioning rod. At the same time, it is ensured that the rotation direction of the dust removal roller is opposite to the movement direction of the fabric, so that the dust removal grooves on the surface of the dust removal roller can better scrape off the dust on the fabric surface and quickly disperse it to both sides to leave the fabric, avoiding affecting the subsequent slurry coating.

[0019] 4. The present invention ensures that the heights of the tops of the two guiding rollers are always above the bottom of the filter press roller or the dust removal roller through the tension buffer assembly, which can ensure that the filter press roller, the dust removal roller or the vibrating bar can all stably contact the fabric. Rotating the knob can make the screw rod move relative to the limit fixing frame under the restriction of the movable frame on the screw rod, that is, the distance between the movable frame and the limit fixing frame can be changed. Thus, the height of the guiding roller can be changed through the tension buffer assembly and the movable frame, and then the length of the fabric transmitted between the two guiding rollers can be changed, so as to achieve the effect of regulating the fabric tension. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the main body of the present invention;

[0021] Figure 2 is a side view of the present invention;

[0022] Figure 3 is a rear view of the present invention;

[0023] Figure 4 is a top view of the present invention;

[0024] Figure 5 is a front sectional view of the present invention;

[0025] Figure 6 is a side sectional view of the screw rod in the present invention;

[0026] Figure 7 is a partial structural diagram of the tension buffer assembly of the present invention;

[0027] Figure 8 is a transmission schematic diagram of the printed fabric of the present invention.

[0028] In the figure: 1, printing frame; 2, filter press roller; 3, sizing cylinder; 4, spraying tank; 5, piston assembly; 51, sealing sleeve; 52, partition plate; 53, rotating sealing sleeve; 6, screw rod; 7, regulating turntable; 8, slurry replenishing hole; 9, slurry inlet pipe; 10, dust removal roller; 11, dust discharge tank; 12, positioning rod; 13, rotating rod; 14, vibrating bar; 15, transmission rod; 16, transmission mechanism; 161, first belt pulley; 162, second belt pulley; 163, transmission belt; 164, driving shaft; 17, guiding roller; 18, limiting groove; 19, movable frame; 20, tension buffer assembly; 201, lower connecting frame; 202, upper connecting frame; 203, limiting slide bar; 204, tension buffer spring; 21, movable frame; 22, limit fixing frame; 23, screw rod; 24, knob. DETAILED DESCRIPTION OF THE INVENTION

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0030] As Figures 1 to 8 shown, an on-line sizing printing device for a digital printing machine is provided in an embodiment of the present invention, which includes a printing frame 1. A filter press roller 2 is arranged inside the printing frame 1. A sizing cylinder 3 is rotatably sleeved inside the filter press roller 2. The front end of the sizing cylinder 3 penetrates through the filter press roller 2 and is fixedly sleeved inside the printing frame 1. A slurry spraying groove 4 is formed below the sizing cylinder 3 near the incoming material side on the surface. Two piston assemblies 5 are hermetically sleeved inside the sizing cylinder 3. The outer surface of each piston assembly 5 is hermetically attached to the inside of the slurry spraying groove 4. A lead screw 6 is threadedly sleeved inside the piston assembly 5. The front end of the lead screw 6 penetrates through the piston assembly 5, the sizing cylinder 3 and the filter press roller 2 and extends to the front of the printing frame 1 and is fixedly connected to a slurry inlet pipe 9. A regulating turntable 7 is fixedly sleeved on the outside of the lead screw 6 between the printing frame 1 and the slurry inlet pipe 9. A slurry replenishing hole 8 is formed on the front surface of the lead screw 6. One end of the slurry replenishing hole 8 communicates with the slurry inlet pipe 9, and the other end of the slurry replenishing hole 8 extends to the middle of the lead screw 6 and between the opposite surfaces of the two piston assemblies 5 and communicates with the inside of the sizing cylinder 3;

[0031] Rotating the regulating turntable 7 can drive the two piston assemblies 5 to move through the lead screw 6, and the movement of the two piston assemblies 5 moves towards or away from each other under the limitation of the sizing cylinder 3 and the slurry spraying groove 4;

[0032] Since the movement of the two piston assemblies 5 towards or away from each other can change the width of the slurry sprayed at the slurry spraying groove 4 inside the sizing cylinder 3 to adapt it to the width dimension of the fabric, and the solid-liquid slurry can be continuously injected into the inside of the sizing cylinder 3 through the slurry inlet pipe 9 and the lead screw 6, and it is ensured that the slurry always enters between the opposite surfaces of the two piston assemblies 5;

[0033] Through the filter press roller 2, it can be ensured that the internal sizing cylinder 3 and the slurry spraying groove 4 can directly spray the solid-liquid slurry onto the printing fabric. Furthermore, through the slurry spraying groove 4, it can be ensured that the solid-color slurry inside the sizing cylinder 3 can be sprayed onto the fabric along the expected direction and is not affected by the continuous rotation of the filter press roller 2. At the same time, it is convenient for the subsequent slurry to be roll-pressed by the continuously rotating filter press roller 2 to make it evenly smeared.

[0034] As Figure 6As shown in the figure, each piston assembly 5 includes a sealing sleeve 51 that is hermetically sleeved inside the sizing cylinder 3 and the slurry spraying tank 4. Inside each sealing sleeve 51, a partition plate 52 is fixedly sleeved. Inside each partition plate 52, a rotary sealing sleeve 53 is fixedly sleeved. The rotary sealing sleeve 53 is threadedly sleeved outside the lead screw 6. The two rotary sealing sleeves 53 move towards or away from each other under the action of the lead screw 6.

[0035] Through the sealing sleeve 51, the sealing effect between the piston assembly 5 and the sizing cylinder 3 and the slurry spraying tank 4 can be ensured. Through the rotary sealing sleeve 53, the sealing effect between the piston assembly 5 and the lead screw 6 can be ensured.

[0036] As Figure 5 shown in the figure, inside the printing frame 1, a dust removal roller 10 is provided on the outside of the filter press roller 2 near the incoming material direction. The outer surface of the dust removal roller 10 is in close contact with the filter press roller 2. A dust discharge groove 11 is formed on the outer surface of the dust removal roller 10. A positioning rod 12 is movably sleeved inside the dust discharge groove 11. Both ends of the positioning rod 12 are movably connected to the printing frame 1.

[0037] Through the restriction of the positioning rod 12, it is ensured that the filter press roller 2 can continuously drive the dust removal roller 10 to rotate, and at the same time, it is ensured that the rotation direction of the dust removal roller 10 is opposite to the movement direction of the fabric, so as to ensure that the dust discharge groove 11 on the surface of the dust removal roller 10 can better scrape the dust on the fabric surface and quickly disperse it to both sides to leave the fabric, avoiding affecting the subsequent sizing.

[0038] As Figure 5 shown in the figure, inside the printing frame 1, a rotating rod 13 is provided on the outside of the dust removal roller 10 near the incoming material side. A vibrating bar 14 is provided outside the rotating rod 13. A transmission rod 15 is fixedly sleeved inside the rotating rod 13. The front end of the transmission rod 15 is movably connected to the printing frame 1. The rear end of the transmission rod 15 passes through the rotating rod 13 and extends to the rear of the printing frame 1 and is fixedly connected to a transmission mechanism 16.

[0039] Through the transmission mechanism 16, the vibrating bar 14 can be made to rotate continuously and quickly following the rotating rod 13 to shake off the dust on the fabric surface so that it no longer adheres to the fabric surface, so as to be scraped off by the dust discharge groove 11 later.

[0040] As Figure 3As shown in the figure, the transmission mechanism 16 includes a first pulley 161 and a second pulley 162 disposed on the back of the printing frame 1. The outer diameter dimension of the first pulley 161 is larger than that of the second pulley 162. A transmission belt 163 is connected between the first pulley 161 and the second pulley 162. The second pulley 162 is fixedly connected to the transmission rod 15. A driving shaft 164 is fixedly sleeved inside the first pulley 161. One end of the driving shaft 164 extends into the printing frame 1 and is fixedly connected to the filter press roller 2, and the other end of the driving shaft 164 is fixedly connected to the output shaft of the driving motor.

[0041] Through the transmission mechanism 16, the filter press roller 2 and the rotating rod 13 can be driven simultaneously. Moreover, with the cooperation of the first pulley 161 and the second pulley 162, the filter press roller 2 is kept rotating slowly, while the rotating rod 13 rotates at a faster speed, ensuring the effect of roller pressing and smearing, and improving the dust removal efficiency at the same time.

[0042] As Figure 5 and Figure 6 shown in the figure, two left and right side guide rollers 17 are arranged inside the printing frame 1 outside the filter press roller 2, the dust removal roller 10 and the rotating rod 13. Limiting grooves 18 are formed on both the left and right sides of the printing frame 1 on the front and rear sides of the guide rollers 17. An activity frame 19 is movably sleeved inside each guide roller 17. Both ends of the activity frame 19 penetrate through the guide roller 17 and extend to the front and rear sides of the printing frame 1 and are fixedly connected with a tension buffer assembly 20.

[0043] Through the tension buffer assembly 20, it is ensured that the height of the tops of the two guide rollers 17 is always above the bottom of the filter press roller 2 or the dust removal roller 10, which can ensure that the filter press roller 2, the dust removal roller 10 or the vibrating bar 14 can all be in stable contact with the fabric.

[0044] As Figure 1 shown in the figure, the tops of the front and rear two tension buffer assemblies 20 connected to both ends of the same activity frame 19 are fixedly connected with an activity frame 21. A limiting and fixing frame 22 fixedly connected to the inside of the printing frame 1 is arranged at the bottom of the activity frame 21. A lead screw 23 is threadedly sleeved inside the limiting and fixing frame 22. Both ends of the lead screw 23 penetrate through the limiting and fixing frame 22. The upper end of the lead screw 23 penetrates through the activity frame 21 and is fixedly connected with a knob 24. The lead screw 23 is rotationally clamped inside the activity frame 21.

[0045] Rotating the knob 24 can make the lead screw 23 move relative to the limiting and fixing frame 22 under the restriction of the activity frame 21 on the lead screw 23, that is, the distance between the activity frame 21 and the limiting and fixing frame 22 can be changed. Thus, the height of the guide roller 17 can be changed through the tension buffer assembly 20 and the activity frame 19, and the length of the fabric transmitted between the two guide rollers 17 can be changed, so as to achieve the effect of regulating the fabric tension.

[0046] As Figure 7As shown in the figure, the tension buffer assembly 20 includes a lower connecting frame 201 connected to either the front or rear end of the movable frame 19, and an upper connecting frame 202 connected to either the front or rear end of the movable frame 21. A limiting slide bar 203 is movably sleeved inside the lower connecting frame 201. Both ends of the limiting slide bar 203 penetrate through the lower connecting frame 201. The top of the limiting slide bar 203 is fixedly connected to the upper connecting frame 202. A tension buffer spring 204 is arranged outside the limiting slide bar 203 and is located between the lower connecting frame 201 and the upper connecting frame 202.

[0047] Due to the setting of the tension buffer assembly 20, it can not only ensure that the movable frame 21 can drive the guide roller 17 to move up and down through the tension buffer assembly 20 and the movable frame 19, but also ensure that the elastic force of the tension buffer spring 204 can always provide a good tension buffer effect for the fabric, ensuring that the fabric is always stably transported during the sizing process.

[0048] As Figure 8 shown in the figure, the bottoms of the dust removal roller 10 and the filter pressing roller 2 are on the same horizontal plane. The top of the guide roller 17 is higher than the bottoms of the dust removal roller 10 or the filter pressing roller 2. The top of the rotating rod 13 is located between the top of the guide roller 17 and the top of the filter pressing roller 2 or the dust removal roller 10.

[0049] As Figure 8 shown in the figure, the outer surfaces of the filter pressing roller 2, the dust removal roller 10, the rotating rod 13, and the guide roller 17 are connected by a printed fabric. The printed fabric passes over the top of one of the guide rollers 17, the top of the rotating rod 13, the bottom of the dust removal roller 10, and the bottom of the filter pressing roller 2 in sequence, and is output from the top of the other guide roller 17.

[0050] Working principle and usage process:

[0051] Bypass the corresponding conveying rollers with the printed fabric in sequence, and start the winding and unwinding equipment to continuously convey the fabric. At the same time, start the sizing device. First, the sizing liquid injected into the inside of the sizing cylinder 3 through the feed pipe 9 and the slurry replenishing hole 8 is sprayed onto the fabric through the spraying groove 4 and the spraying holes on the surface of the filter pressing roller 2. At the same time, the drive shaft 164 drives the filter pressing roller 2 to rotate continuously, so as to roll and smear the fabric with the sprayed sizing liquid to make the sizing liquid uniform. The rotation of the drive shaft 164 can drive the second pulley 162 to rotate continuously through the first pulley 161 and the transmission belt 163. The rotation of the second pulley 162 can drive the rotating rod 13 and the vibrating bar 14 to rotate continuously through the transmission rod 15. Due to the continuous rotation of the vibrating bar 14, the fabric can be continuously struck so that most of the dust on its surface is shaken off. The remaining small amount of dust particles that are not shaken off in time can be scraped off by the dust discharging groove 11 when the filter pressing roller 2 drives the dust removal roller 10 to rotate and gradually spread to the front and rear sides, and finally leave the fabric.

[0052] The rotation control turntable 7 can drive the movement of two piston assemblies 5 through the lead screw 6. The movement of the two piston assemblies 5 is restricted by the sizing cylinder 3 and the slurry spraying tank 4. Thus, the continuous rotation of the lead screw 6 can drive the two piston assemblies 5 to move towards or away from each other, so as to change the distance between the facing surfaces of the two piston assemblies 5 inside the filter press roller 2, making the width of the slurry sprayed at the slurry spraying tank 4 adapt to the width dimension of the fabric.

[0053] It should be noted that in this text, relational 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 these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or also includes elements inherent to such process, method, article or device.

[0054] Although embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An on-line sizing and printing device for a digital printing machine, comprising a printing frame (1), characterized in that: Inside the printing rack (1), a filter press roller (2) is provided. Inside the filter press roller (2), a sizing cylinder (3) is rotatably sleeved. The front end of the sizing cylinder (3) penetrates through the filter press roller (2) and is fixedly sleeved inside the printing rack (1). Below the sizing cylinder (3) near the incoming material side, a slurry spraying groove (4) is formed on the surface. Inside the sizing cylinder (3), two piston assemblies (5) are hermetically sleeved, and the outer surface of each piston assembly (5) is hermetically fitted with the inside of the slurry spraying groove (4). A first lead screw (6) is threadedly sleeved inside the piston assembly (5). The front end of the first lead screw (6) penetrates through the piston assembly (5), the sizing cylinder (3), and the filter press roller (2) and extends to the front of the printing rack (1) and is fixedly connected to a slurry inlet pipe (9). An adjusting turntable (7) is fixedly sleeved on the outer part of the first lead screw (6) between the printing rack (1) and the slurry inlet pipe (9). A slurry replenishing hole (8) is formed on the front surface of the first lead screw (6). One end of the slurry replenishing hole (8) communicates with the slurry inlet pipe (9), and the other end of the slurry replenishing hole (8) extends to the middle of the first lead screw (6) and between the opposite surfaces of the two piston assemblies (5) and communicates with the inside of the sizing cylinder (3). Inside the printing rack (1), a rotating rod (13) is provided on the outer side of the dust removing roller (10) near the incoming material side. A vibrating bar (14) is arranged on the outer part of the rotating rod (13). A transmission rod (15) is fixedly sleeved inside the rotating rod (13). The front end of the transmission rod (15) is movably connected to the printing rack (1). The rear end of the transmission rod (15) penetrates through the rotating rod (13) and extends to the rear of the printing rack (1) and is fixedly connected to a transmission mechanism (16). Inside the printing rack (1), two guide rollers (17) are provided on the left and right sides outside the filter press roller (2), the dust removing roller (10), and the rotating rod (13). On the left and right sides of the printing rack (1), limiting grooves (18) are formed on the front and rear sides of the guide rollers (17). Inside each guide roller (17), a movable frame one (19) is movably sleeved. The two ends of the movable frame one (19) penetrate through the guide roller (17) and extend to the front and rear sides of the printing rack (1) and are fixedly connected to a tension buffer assembly (20). On the top of the front and rear two tension buffer assemblies (20) connected to the two ends of the same movable frame one (19), a movable frame two (21) is fixedly connected. At the bottom of the movable frame two (21), a limiting and fixing frame (22) fixedly connected to the inside of the printing rack (1) is provided. A second lead screw (23) is threadedly sleeved inside the limiting and fixing frame (22). The two ends of the second lead screw (23) penetrate through the limiting and fixing frame (22). The upper end of the second lead screw (23) penetrates through the movable frame two (21) and is fixedly connected to a knob (24). The second lead screw (23) is rotationally clamped inside the movable frame two (21). The tension buffer assembly (20) includes a lower connecting frame (201) connected to either the front or rear end of the movable frame one (19), and an upper connecting frame (202) connected to either the front or rear end of the movable frame two (21). A limiting slide bar (203) is movably sleeved inside the lower connecting frame (201). Both ends of the limiting slide bar (203) penetrate through the lower connecting frame (201), and the top of the limiting slide bar (203) is fixedly connected to the upper connecting frame (202). A tension buffer spring (204) is disposed outside the limiting slide bar (203) between the lower connecting frame (201) and the upper connecting frame (202).

2. An on-line sizing printing device for a digital printing machine according to claim 1, characterized in that: Each piston assembly (5) includes a sealing sleeve (51) hermetically sleeved inside the sizing cylinder (3) and the slurry spraying tank (4). A partition plate (52) is fixedly sleeved inside each sealing sleeve (51). A rotating sealing sleeve (53) is fixedly sleeved inside each partition plate (52). The rotating sealing sleeve (53) is threadedly sleeved outside the first lead screw (6). The two rotating sealing sleeves (53) move towards or away from each other under the action of the first lead screw (6).

3. An on-line sizing and printing device for a digital printing machine according to claim 1, characterized in that: Inside the printing frame (1), a dust removal roller (10) is disposed on the outside of the filter press roller (2) near the incoming material direction. The outer surface of the dust removal roller (10) is in close contact with the filter press roller (2). A dust unloading groove (11) is formed on the outer surface of the dust removal roller (10). A positioning rod (12) is movably sleeved inside the dust unloading groove (11). Both ends of the positioning rod (12) are movably connected to the printing frame (1).

4. An on-line sizing printing device for a digital printing machine according to claim 1, characterized in that: The transmission mechanism (16) includes a first pulley (161) and a second pulley (162) disposed on the back of the printing frame (1). The outer diameter of the first pulley (161) is larger than that of the second pulley (162). A transmission belt (163) is connected between the first pulley (161) and the second pulley (162). The second pulley (162) is fixedly connected to the transmission rod (15). A driving shaft (164) is fixedly sleeved inside the first pulley (161). One end of the driving shaft (164) extends into the printing frame (1) and is fixedly connected to the filter press roller (2), and the other end of the driving shaft (164) is fixedly connected to the output shaft of the driving motor.

5. An on-line sizing and printing device for a digital printing machine according to claim 1, characterized in that: The bottoms of the dust removal roller (10) and the filter press roller (2) are at the same horizontal plane. The top of the guide roller (17) is higher than the bottoms of the dust removal roller (10) or the filter press roller (2). The top of the rotating rod (13) is located between the top of the guide roller (17) and the top of the filter press roller (2) or the dust removal roller (10).

6. The on-line sizing and printing device of a digital printing machine according to claim 1, characterized in that: The outer surfaces of the filter press roller (2), the dust removal roller (10), the rotating rod (13), and the guide roller (17) are connected by printing fabric. The printing fabric sequentially passes over the top of one of the guide rollers (17), the top of the rotating rod (13), the bottom of the dust removal roller (10), and the bottom of the filter press roller (2), and is output from the top of the other guide roller (17).

Images