A feeding device for a double-sided digital printing machine

Abstract

The present invention discloses a feeding device for a double-sided digital printing machine, which relates to the technical field of feeding tools for printing machines. It includes a bottom plate and vertical plates arranged on both sides of the top surface of the bottom plate. A rotating shaft is provided at the upper part of the inner side surfaces of the two vertical plates. Side retaining ring plates are sleeved on both sides of the shaft body of the feeding roller, and a contact sleeve is fixedly connected to the middle of the inner side surface of the side retaining ring plate; threaded tubes are sleeved on the shaft bodies at both ends of the bidirectional lead screw, and a transmission component is arranged inside the transmission cavity; a clamping mechanism is arranged in the storage groove; through the cooperation of the feeding roller with the contact sleeve and the clamping mechanism, the present invention can stably support the fabric roll to be printed on the feeding roller, avoid the situation of unstable fabric unwinding when there is a large difference between the inner diameter of the inner support cylinder of the fabric roll and the diameter of the feeding roller, and improve the stability of the fabric roll during unwinding and feeding, solving the problem of unstable unwinding between the feeding device of the existing double-sided digital printing machine and the feeding roller due to looseness when unwinding and rotating a fabric roll with a large inner diameter.

Description

Technical Field

[0001] The present invention relates to the technical field of feeding appliances for printing machines, and particularly to a feeding device for a double-sided digital printing machine. Background Art

[0002] A double-sided digital printing machine is a device for printing using digital technology. Digital printing technology is a high-tech product integrating machinery, computer, and electronic information technology that has gradually formed with the continuous development of computer technology; during the printing process, the digital printing machine needs to use a feeding device to unwind the fabric roll to be printed.

[0003] However, when the existing feeding device for a double-sided digital printing machine is in use, due to the large difference in the inner diameters of some fabric rolls, in order to enable the stable unwinding operation of the fabric roll during the unwinding of the fabric, it is necessary to select a feeding roller matching the inner diameter of the fabric roll to support and unwind the fabric roll. As a result, when using different fabric rolls for printing operations, it is necessary to select a matching feeding roller for installation. When the difference between the inner diameter of the inner support cylinder of the fabric roll and the diameter of the feeding roller is large, it is extremely easy to have the problem of unstable fabric unwinding during the unwinding process; therefore, the above problems need to be improved. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies existing in the prior art, and to propose a feeding device for a double-sided digital printing machine.

[0005] To achieve the above purpose, the present invention adopts the following technical solution: A feeding device for a double-sided digital printing machine includes a bottom plate and vertical plates provided on both sides of the top surface of the bottom plate. The upper parts of the inner sides of the two vertical plates are both horizontally rotatably provided with rotating shafts through bearing seats. A feeding roller for supporting the fabric roll is horizontally installed between the two rotating shafts. Side retaining ring plates are movably sleeved on both sides of the shaft body of the feeding roller. A butting sleeve is horizontally fixedly connected to the middle of the inner side of the side retaining ring plate, and the butting sleeve is movably sleeved on the feeding roller; An unlockable motor is provided on the outer side surface of the vertical plate on one side of the bottom plate; The wall thickness of the butting sleeve gradually decreases from the outer end to the inner end direction. The edge of the inner end of the butting sleeve is arc-shaped, and the butting sleeve is a cylindrical structure in the shape of a truncated cone.

[0006] Annular grooves are formed on the outer walls at both ends of the feeding roller. Flange plates are fixedly sleeved on the inner ends of the rotating shafts, and the flange plates are fixedly connected to the ends of the feeding roller. A transverse movement cavity is horizontally formed inside the feeding roller. Through holes communicating with the transverse cavity are formed on both end faces of the feeding roller. Fixed plates are vertically installed in the through holes. A bidirectional lead screw is horizontally rotatably arranged inside the transverse movement cavity between the two fixed plates. Threaded tubes are movably sleeved on the shafts at both ends of the bidirectional lead screw. A transmission cavity is formed inside the vertical plate on one side of the bottom plate. A transmission component for driving the bidirectional lead screw is arranged inside the transmission cavity. Threaded sleeves are fixedly connected to the top and bottom of the threaded tube. A connecting column is in threaded connection with the threaded sleeve. Receiving grooves are formed at the top and bottom of the inner circumferential wall of the side retaining ring plate. A clamping mechanism for positioning and installing the side retaining ring plate is arranged in the receiving groove.

[0007] Preferably, the transmission component includes an upper transmission groove formed on the inner end face of the rotating shaft on one side of the bottom plate, a spline shaft horizontally rotatably arranged in the transmission groove, a movable ring plate vertically movably arranged inside the transmission cavity, a plurality of electric push rods horizontally arranged on the inner wall on one side of the transmission cavity, and a spline sleeve horizontally rotatably arranged inside the inner ring of the movable ring plate. The telescopic end of the electric push rod is fixedly connected to one side face of the movable ring plate. The driving shaft of the non-locking motor movably penetrates into the driving cavity and is coaxially fixedly connected with a spline block. The outer end of the spline shaft movably penetrates into the transmission cavity, and the outer end of the spline shaft is movably inserted into one end of the spline sleeve. Spline grooves are horizontally formed on both end faces of the bidirectional lead screw, and the inner end of the spline shaft is movably inserted into the spline groove at one end of the bidirectional lead screw.

[0008] Preferably, rectangular strip openings are horizontally formed at the upper and lower ends of the inner walls at both ends of the transverse movement cavity, and the outer ends of the connecting columns extend out from the rectangular strip openings.

[0009] Preferably, the clamping mechanism includes a positioning insertion rod vertically slidably arranged in the receiving groove, a plugging groove formed on the outer side of the connecting column, a return groove formed on the inner side of the connecting column, and a movable plate vertically movably arranged in the return groove. Circular grooves communicating with the inner ends of the receiving grooves are formed in the middle of the upper and lower ends of the inner circumferential wall of the side retaining ring plate. A limiting component for clamping the outer end of the connecting column is arranged in the circular groove. The inner end of the positioning insertion rod is movably inserted into the plugging groove. A pair of limiting insertion blocks are spaced apart and penetrated through the outer end of the plate body of the movable plate. A pair of stabilizing rods are horizontally arranged on the inner wall of the return groove. The top edge of the outer end of the limiting insertion block is arc-shaped. A limiting groove is formed on the rod body of the positioning insertion rod located in the plugging groove in cooperation with the limiting insertion block. Abutted rods are horizontally arranged at the upper and lower ends of the inner walls on both sides of the transverse movement cavity. A through opening for cooperating with the abutted rod is horizontally formed on the outer side face of the inner end of the connecting column. A U-shaped opening for cooperating with the abutted rod is penetrated through the inner end face of the positioning insertion rod.

[0010] Preferably, a return spring is movably sleeved on the stabilizing rod. A guiding groove is horizontally formed on the inner end surface of the limiting insertion block in cooperation with the stabilizing rod. The outer end of the stabilizing rod is movably inserted into the guiding groove. The outer end of the return spring abuts against the inner end surface of the limiting insertion block. Rectangular grooves are horizontally formed on the inner walls at the upper and lower ends of the return groove. Sliders are fixedly connected to the top and bottom of the movable plate, and the sliders are slidably clamped in the rectangular grooves.

[0011] Preferably, the limiting assembly includes a clamping plate horizontally movably arranged in the circular groove, suspension rods vertically fixedly connected to both sides of the inner wall of the circular groove, and a positioning sleeve horizontally fixedly connected to the inner side surface of the clamping plate. The positioning sleeve is movably sleeved on the outer end of the connecting column. The outer end surface of the connecting column abuts against the inner end surface of the clamping plate. The positioning insertion rod movably penetrates through the clamping plate. A pushing ring is fixedly sleeved on the rod body of the upper part of the positioning insertion rod. The inner side surface of the pushing ring abuts against the outer end surface of the clamping plate. Fixing grooves are formed on both sides of the inner end surface of the clamping plate. Anti-detachment plates are horizontally movably arranged in the fixing grooves. The outer ends of the suspension rods movably penetrate into the fixing grooves and are fixedly connected to the anti-detachment plates. A return spring is movably sleeved on the rod body of the suspension rod between the outer end surface of the anti-detachment plate and the inner wall of the fixing groove.

[0012] Preferably, a plurality of stabilizing balls are equidistantly and rotatably clamped on the circumferential sides at both ends of the inner circumferential wall of the side retaining ring plate. The exposed bead bodies of the stabilizing balls are movably abutted against the outer wall of the feeding roller.

[0013] Preferably, a first magnetic block is horizontally fixedly connected to the outer end surface of the positioning insertion rod. A second magnetic block with the opposite magnetic pole to the first magnetic block is horizontally arranged on the inner wall of the outer end of the storage groove. A handle rod is horizontally fixedly connected to the rod body of the outer side surface of the positioning insertion rod. A strip-shaped opening is vertically formed on the inner wall of the outer end of the storage cavity. The outer end of the handle rod extends out from the strip-shaped opening.

[0014] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the cooperation of the feeding roller, the abutting sleeve and the clamping mechanism, when feeding and unwinding the fabric roll to be printed, the fabric roll to be printed can be stably supported on the feeding roller, avoiding the situation of unstable fabric unwinding when the inner diameter of the inner support cylinder of the fabric roll is quite different from the diameter of the feeding roller. At the same time, the stability of the fabric roll during unwinding and feeding can be improved, solving the problem of unstable unwinding between the feeding device of the existing double-sided digital printing machine and the feeding roller when unwinding and rotating a fabric roll with a larger inner diameter. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0016] Figure 1Schematic diagram of the external structure of the present invention;

[0017] Figure 2 Schematic diagram of the abutting display structure of the abutting sleeve of the present invention;

[0018] Figure 3 Partial cross-sectional view of the front view structure of the present invention;

[0019] Figure 4 Overall cross-sectional view of the front view structure of the present invention;

[0020] Figure 5 Cross-sectional view of the connection structure between the spline sleeve and the spline shaft of the present invention;

[0021] Figure 6 Cross-sectional view of the structure between the side retaining ring plate and the abutting sleeve of the present invention;

[0022] Figure 7 Cross-sectional view of the connection structure between the side retaining ring plate and the connecting column of the present invention;

[0023] Figure 8 For the present invention Figure 7 Cross-sectional view of the structure at part A in;

[0024] Figure 9 Schematic diagram of one side of the positioning plug rod of the present invention;

[0025] Figure 10 Cross-sectional view of the clamping plate structure of the present invention.

[0026] Reference numerals in the figure: 1, bottom plate; 2, vertical plate; 3, rotating shaft; 4, feeding roller; 5, side retaining ring plate; 6, abutting sleeve; 7, lockless motor; 8, bidirectional lead screw; 9, spline shaft; 10, movable ring plate; 11, electric push rod; 12, spline sleeve; 13, spline block; 14, threaded tube; 15, connecting column; 16, abutting rod; 17, positioning plug rod; 18, first magnet; 19, second magnet; 20, clamping plate; 21, movable plate; 22, limiting plug; 23, stabilizing rod; 24, return spring; 25, suspension rod; 26, reset spring. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with 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.

[0028] Embodiment: Refer to Figures 1 - 10, A feeding device for a double-sided digital printing machine, comprising a bottom plate 1 and vertical plates 2 arranged on both sides of the top surface of the bottom plate 1. Universal wheels are installed at the four corners of the bottom surface of the bottom plate 1, facilitating the movement operation of this device. On the upper parts of the inner sides of the two vertical plates 2, rotating shafts 3 are horizontally arranged through bearing seats. A feeding roller 4 for supporting a fabric roll is horizontally installed between the two rotating shafts 3. Side retaining ring plates 5 are movably sleeved on both sides of the shaft body of the feeding roller 4. In the middle of the inner side of the side retaining ring plate 5, an abutting sleeve 6 is horizontally fixed. The abutting sleeve 6 is movably sleeved on the feeding roller 4; on the outer side of the vertical plate 2 on one side of the bottom plate 1, a lockless motor 7 is provided; the wall thickness of the abutting sleeve 6 gradually decreases from the outer end to the inner end direction. The edge of the inner end of the abutting sleeve 6 is arc-shaped, and the abutting sleeve 6 is a conical frustum-shaped cylindrical structure; annular grooves are opened on the outer walls at both ends of the feeding roller 4. Flange plates are fixedly sleeved at the inner ends of the rotating shafts 3, and the flange plates are fixedly connected to the ends of the feeding roller 4; a transverse movement cavity is horizontally opened inside the feeding roller 4. Through holes communicating with the transverse cavity are opened on both end faces of the feeding roller 4. Fixed plates are vertically installed in the through holes. A bidirectional lead screw 8 is horizontally rotated inside the transverse movement cavity between the two fixed plates. Threaded tubes 14 are movably sleeved on the shaft bodies at both ends of the bidirectional lead screw 8. A transmission cavity is opened inside the vertical plate 2 on one side of the bottom plate 1, and a transmission component for driving the bidirectional lead screw 8 is provided inside the transmission cavity; Threaded sleeves are fixedly connected to the top and bottom of the threaded tube 14. Connecting columns 15 are threadedly connected to the threaded sleeves. Rectangular strip openings are horizontally opened at the upper and lower ends of the inner walls at both ends of the transverse movement cavity. The outer ends of the connecting columns 15 extend out from the rectangular strip openings; Receiving grooves are opened at the top and bottom of the inner circumferential wall of the side retaining ring plate 5, and a clamping mechanism for positioning and installing the side retaining ring plate 5 is provided in the receiving grooves; Through the cooperation of the feeding roller 4 with the abutting sleeve 6 and the clamping mechanism, when feeding and unwinding a fabric roll to be printed, the fabric roll to be printed can be stably supported on the feeding roller 4, avoiding the situation of unstable fabric unwinding when the inner diameter of the inner support cylinder of the fabric roll is quite different from the diameter of the feeding roller 4. At the same time, the stability of the fabric roll during unwinding and feeding can be improved, solving the problem of unstable unwinding between the feeding device of the existing double-sided digital printing machine and the feeding roller 4 when unwinding and rotating a fabric roll with a larger inner diameter.

[0029] In the present invention, the transmission assembly includes an upper transmission groove formed at the inner end face of the rotating shaft 3 on one side of the bottom plate 1, a spline shaft 9 rotatably disposed horizontally in the transmission groove, a movable ring plate 10 movably disposed vertically inside the transmission cavity, a plurality of electric push rods 11 horizontally disposed on the inner wall of one side of the transmission cavity, and a spline sleeve 12 rotatably disposed horizontally in the inner ring of the movable ring plate 10. The telescopic end of the electric push rod 11 is fixedly connected to one side face of the movable ring plate 10. The driving shaft of the lockless motor 7 movably penetrates into the inside of the driving cavity and is coaxially fixedly connected with a spline block 13. The outer end of the spline shaft 9 movably penetrates into the inside of the transmission cavity, and the outer end of the spline shaft 9 is movably inserted into the inside of one end of the spline sleeve 12. Spline grooves are horizontally formed on both end faces of the bidirectional lead screw 8, and the inner end of the spline shaft 9 is movably inserted into the spline groove inside one end of the bidirectional lead screw 8, which is convenient for performing forward and reverse transmission operations on the bidirectional lead screw 8.

[0030] In the present invention, the clamping mechanism includes a positioning plug 17 slidably disposed vertically in the receiving groove, a plugging groove formed on the outer side of the inside of the connecting column 15, a return groove formed on the inner side of the inside of the connecting column 15, and a movable plate 21 movably disposed vertically in the return groove. Circular grooves communicating with the inner end of the receiving groove are formed in the middle of the upper and lower ends of the inner ring wall of the side retaining ring plate 5, and a limiting component for clamping the outer end of the connecting column 15 is provided in the circular groove; the inner end of the positioning plug 17 is movably inserted into the plugging groove, and a pair of limiting plugs 22 are spaced apart and penetrated through the outer end of the plate body of the movable plate 21. A pair of stabilizing rods 23 are horizontally disposed on the inner wall of the return groove. The top edge of the outer end of the limiting plug 22 is arc-shaped, and a limiting groove is formed on the rod body of the positioning plug 17 located in the plugging groove to cooperate with the limiting plug 22; Abutting rods 16 are horizontally disposed at the upper and lower ends of the inner walls on both sides of the transverse movement cavity. A through port cooperating with the abutting rod 16 is horizontally formed on the outer side surface of the inner end of the connecting column 15. A U-shaped opening cooperating with the abutting rod 16 is formed through the inner end surface of the positioning plug 17; A plurality of stabilizing balls are equidistantly and rotatably clamped on the peripheral sides of both ends of the inner ring wall of the side retaining ring plate 5, and the exposed bead bodies of the stabilizing balls are movably abutted against the outer wall of the feeding roller 4. The arrangement of the stabilizing balls can improve the stability and smoothness of the side retaining ring plate 5 during movement.

[0031] In the present invention, a return spring 24 is movably sleeved on the stabilizing rod 23. A guiding groove is horizontally formed on the inner end surface of the limiting plug 22 to cooperate with the stabilizing rod 23, and the outer end of the stabilizing rod 23 is movably inserted into the guiding groove. The outer end of the return spring 24 abuts against the inner end surface of the limiting plug 22; Rectangular grooves are horizontally formed on the inner walls of the upper and lower ends of the return groove. Sliders are fixedly connected to the top and bottom ends of the movable plate 21, and the sliders are slidably clamped in the rectangular grooves, which is convenient for further improving the stability of the movable plate 21 during movement.

[0032] In the present invention, the limiting component includes a clamping plate 20 horizontally movably arranged in a circular groove, a suspension rod 25 vertically fixed on both sides of the inner wall of the circular groove, and a positioning sleeve horizontally fixed on the inner side surface of the clamping plate 20. The positioning sleeve is movably sleeved on the outer end of the connecting column 15. The outer end surface of the connecting column 15 abuts against the inner end surface of the clamping plate 20. The positioning insertion rod 17 movably penetrates through the clamping plate 20. A pushing ring is fixedly sleeved on the rod body of the upper part of the positioning insertion rod 17. The inner side surface of the pushing ring abuts against the outer end surface of the clamping plate 20. Fixed grooves are formed on both sides of the inner end surface of the clamping plate 20. An anti-detachment plate is horizontally movably arranged in the fixed groove. The outer end of the suspension rod 25 movably penetrates into the fixed groove and is fixed to the anti-detachment plate. A return spring 26 is movably sleeved on the rod body of the suspension rod 25 between the outer end surface of the anti-detachment plate and the inner wall of the fixed groove, which is convenient for improving the connection stability and connection strength between the side baffle ring plate 5 and the connecting column 15.

[0033] In the present invention, a first magnetic block 18 is horizontally fixed on the outer end surface of the positioning insertion rod 17. A second magnetic block 19 with the opposite magnetic pole to the first magnetic block 18 is horizontally arranged on the inner wall of the outer end of the receiving groove. A handle rod is horizontally fixed on the rod body of the outer side surface of the positioning insertion rod 17. A strip-shaped opening is vertically formed on the inner wall of the outer end of the receiving cavity. The outer end of the handle rod extends out from the strip-shaped opening, which is convenient for pulling and pushing the positioning insertion rod 17.

[0034] Working principle: In this embodiment, the present invention also proposes a usage method of a feeding device of a double-sided digital printing machine, including the following steps:

[0035] Step 1, first, the lockless motor 7 and the electric push rod 11 are respectively electrically connected to an external control device through wires. Then, the feeding roller 4 is disassembled from between the two rotating shafts 3. Then, an external operating tool is inserted into the spline groove at one end of the bidirectional lead screw 8 to drive the bidirectional lead screw 8 to reverse, or the lockless motor 7 is started to drive the transmission component to reversely drive the bidirectional lead screw 8, so that the two threaded tubes 14 move synchronously outward in the transverse movement cavity, so that the threaded tubes 14 move to the end position of the transverse movement cavity.

[0036] Step 2, when the threaded tube 14 moves to the end position of the transverse movement cavity, at this time, the abutting rod 16 will insert into the insertion groove of the connecting column 15 through the through hole and pass through the U-shaped opening at the inner end of the positioning insertion rod 17 to abut against the movable plate 21. Then, the movable plate 21 is pressed tightly back into the return groove through the abutting rod 16, so that the limiting block 22 driven by the movable plate 21 moving back into the return groove exits outside the limiting groove on the positioning insertion rod 17. Then, by pulling the handle outwards, the inner end of the positioning insertion rod 17 can be driven to withdraw from the insertion groove, and the first magnetic block 18 on the outer end surface of the positioning insertion rod 17 is magnetically attracted to the second magnetic block 19 in the receiving groove, so that the positioning insertion rod 17 moving back into the receiving groove is stably magnetically attracted in the receiving groove; so as to cancel the connection between the side baffle ring plate 5 and the connecting column 15, and then the side baffle ring plate 5 can be slid off the feeding roller 4.

[0037] Step 3: Then, insert one end of the feed roller 4 with the lower side retaining ring plate 5 removed into the inner support cylinder in the middle of the fabric roll to be printed. Then, re - sleeve the removed side retaining ring plate 5 on one end of the feed roller 4. Then, push the positioning plug rod 17 out of the storage groove through the handle rod, and make the inner end of the positioning plug rod 17 abut against the insertion groove. Then, when the inner end of the positioning plug rod 17 is pushed out of the storage groove, the pushing ring will push the clamping plate 20, so that the clamping plate 20 abuts against the outer end face of the connecting column 15, and the positioning sleeve is movably sleeved on the outer end of the connecting column 15, playing a role in preventing lateral detachment between the connecting column 15 and the side retaining ring plate 5. Then, insert an external operating tool into the spline groove at one end of the bidirectional lead screw 8 again to drive the bidirectional lead screw 8 to rotate forward. Then, the two threaded tubes 14 are synchronously moved inward by the forward - rotating bidirectional lead screw 8, so that the inner end of the abutting rod 16 exits outside the through - hole. Then, under the action of the return spring 24, the limiting plug block 22 is pushed to be inserted into the limiting groove of the positioning plug rod 17, so as to limit and fix the positioning plug rod 17, so as to prevent the positioning plug rod 17 inserted into the insertion groove from slipping out.

[0038] Step 4: Then, use two lifting ropes of an external lifting device to hook into the annular grooves at both ends of the feed roller 4 respectively, and then lift the feed roller 4 sleeved with the fabric roll to be printed. Then, the staff first fixes one end of the feed roller 4 to the rotating shaft 3 on one side of the vertical plate 2 of the bottom plate 1, and makes the inner end of the spline shaft 9 abut against the spline groove at one end of the bidirectional lead screw 8. Then, fix the other end of the feed roller 4 to another rotating shaft 3.

[0039] Step 5: Then, control the electric push rod 11 to drive the movable ring plate 10 to retract, so that the movable ring plate 10 drives one end of the spline sleeve 12 to be sleeved on the spline block 13. Then, when the lockless motor 7 drives the spline block 13 to rotate, the spline shaft 9 connected to the other end of the spline sleeve 12 can be driven to rotate. The rotation of the spline shaft 9 drives the bidirectional lead screw 8 to rotate forward. The two threaded tubes 14 are synchronously moved inward by the forward - rotating bidirectional lead screw 8, and then drive the side retaining ring plate 5 connected to the connecting column 15 to move, so that the two relatively moving side retaining ring plates 5 push the abutting sleeve 6 inward, and then the inner end of the conical - frustum - shaped abutting sleeve 6 is gradually inserted into the inner support cylinder in the middle of the fabric roll to be printed, so as to stably support the fabric roll to be printed on the feed roller 4, avoiding the situation of unstable fabric unwinding when the inner diameter of the inner support cylinder of the fabric roll is quite different from the diameter of the feed roller 4. Then, lead one end of the fabric roll to be printed to the inlet of the double - sided digital printer. Then, control the electric push rod 11 to extend to drive the movable ring plate 10 to reset. Then, the reset of the movable ring plate 10 makes one end of the spline sleeve 12 disengage from the spline block 13, so that the feed roller 4 can rotate stably when the fabric is pulled.

[0040] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, making equivalent substitutions or changes, shall be covered by the protection scope of the present invention.

Claims

1. A feeding device for a double-sided digital printing machine, comprising a bottom plate (1) and vertical plates (2) arranged on both sides of the top surface of the bottom plate (1), characterized in that: On the upper parts of the inner sides of the two vertical plates (2), there are rotatably arranged transverse rotating shafts (3) through bearing seats. Horizontally installed between the two rotating shafts (3) is a feeding roller (4) for supporting the fabric roll. On both sides of the shaft body of the feeding roller (4), there are movably sleeved side retaining ring plates (5). In the middle of the inner side of the side retaining ring plate (5), there is a horizontally fixed contact sleeve (6). The contact sleeve (6) is movably sleeved on the feeding roller (4). On the outer side of the vertical plate (2) on one side of the bottom plate (1), there is a lockless motor (7). The wall thickness of the contact sleeve (6) gradually decreases from the outer end to the inner end direction. The edge of the inner end of the contact sleeve (6) is arc-shaped, and the contact sleeve (6) is a conical frustum-shaped cylindrical structure. On the outer walls at both ends of the feeding roller (4), there are annular grooves. At the inner ends of the rotating shafts (3), there are fixedly sleeved flange plates, and the flange plates are fixedly connected to the ends of the feeding roller (4). Horizontally opened inside the feeding roller (4) is a transverse movement cavity. Through openings communicating with the transverse cavity are opened on both end faces of the feeding roller (4). Inside the through openings, there are vertically installed fixed plates. Horizontally rotatably arranged inside the transverse movement cavity between the two fixed plates is a bidirectional lead screw (8). On the shaft bodies at both ends of the bidirectional lead screw (8), there are movably sleeved threaded tubes (14). Inside the vertical plate (2) on one side of the bottom plate (1), there is a transmission cavity. Inside the transmission cavity, there is a transmission component for driving the bidirectional lead screw (8). At the top and bottom of the threaded tube (14), there are fixedly connected threaded sleeves. The threaded sleeves are internally threaded with connecting columns (15). At the top and bottom of the inner circumferential wall of the side retaining ring plate (5), there are storage grooves. Inside the storage grooves, there is a clamping mechanism for positioning and installing the side retaining ring plate (5). The clamping mechanism includes a positioning insertion rod (17) vertically slidably arranged in the storage groove, a plugging groove opened on the outer side of the inside of the connecting column (15), a return groove opened on the inner side of the inside of the connecting column (15), and a movable plate (21) vertically movably arranged in the return groove. In the middle of the upper and lower ends of the inner circumferential wall of the side retaining ring plate (5), there are circular grooves communicating with the inner ends of the storage grooves. Inside the circular grooves, there is a limiting component for clamping the outer end of the connecting column (15). The inner end of the positioning insertion rod (17) is movably inserted into the plugging groove. And at the outer end of the plate body of the movable plate (21), there are spacedly arranged a pair of limiting insertion blocks (22) penetrating through. Horizontally arranged on the inner wall of the return groove are a pair of stabilizing rods (23). The top edge of the outer end of the limiting insertion block (22) is arc-shaped. On the rod body of the positioning insertion rod (17) located in the plugging groove, there are limiting grooves cooperating with the limiting insertion blocks (22). Horizontally arranged at the upper and lower ends of both inner walls of the transverse movement cavity are abutting rods (16). Horizontally opened on the outer side of the inner end of the connecting column (15) is a through opening cooperating with the abutting rod (16). Penetratingly opened on the inner end face of the positioning insertion rod (17) is a U-shaped opening cooperating with the abutting rod (16).

2. The feeding device of a double-sided digital printing machine according to claim 1, characterized in that: The transmission assembly includes an upper transmission groove formed at the inner end face of a rotating shaft (3) on one side of the bottom plate (1), a spline shaft (9) rotatably arranged horizontally in the transmission groove, a movable ring plate (10) vertically movably arranged inside the transmission cavity, a plurality of electric push rods (11) horizontally arranged on the inner wall of one side of the transmission cavity, and a spline sleeve (12) rotatably arranged horizontally in the inner ring of the movable ring plate (10). The telescopic end of the electric push rod (11) is fixedly connected to one side face of the movable ring plate (10). The driving shaft of the keyless motor (7) movably penetrates into the driving cavity and is coaxially fixedly connected with a spline block (13). The outer end of the spline shaft (9) movably penetrates into the transmission cavity, and the outer end of the spline shaft (9) is movably inserted into the inner part of one end of the spline sleeve (12). Both end faces of the bidirectional lead screw (8) are horizontally provided with spline grooves, and the inner end of the spline shaft (9) is movably inserted into the spline groove at one end of the bidirectional lead screw (8).

3. The feeding device of a double-sided digital printing machine according to claim 2, characterized in that: Rectangular strip openings are horizontally formed at the upper and lower ends of the inner walls at both ends of the transverse movement cavity, and the outer end of the connecting column (15) extends out from the rectangular strip openings.

4. The feeding device of a double-sided digital printing machine according to claim 1, wherein: A return spring (24) is movably sleeved on the stabilizing rod (23). A guiding groove is horizontally formed on the inner end face of the limiting insertion block (22) in cooperation with the stabilizing rod (23). The outer end of the stabilizing rod (23) is movably inserted into the guiding groove, and the outer end of the return spring (24) abuts against the inner end face of the limiting insertion block (22). Rectangular grooves are horizontally formed on the inner walls at the upper and lower ends of the return groove. Sliders are fixedly connected to the top and bottom of the movable plate (21), and the sliders are slidably clamped in the rectangular grooves.

5. The feeding device of a double-sided digital printing machine according to claim 4, characterized in that: The limiting assembly includes a clamping plate (20) horizontally movably arranged in the circular groove, suspension rods (25) vertically fixedly connected to both sides of the inner wall of the circular groove, and a positioning sleeve horizontally fixedly connected to the inner side face of the clamping plate (20). The positioning sleeve is movably sleeved on the outer end of the connecting column (15). The outer end face of the connecting column (15) abuts against the inner end face of the clamping plate (20). The positioning insertion rod (17) movably penetrates through the clamping plate (20). A pushing ring is fixedly sleeved on the rod body of the upper part of the positioning insertion rod (17), and the inner side face of the pushing ring abuts against the outer end face of the clamping plate (20). Fixed grooves are formed on both sides of the inner end face of the clamping plate (20). Anti - detachment plates are horizontally movably arranged in the fixed grooves. The outer ends of the suspension rods (25) movably penetrate into the fixed grooves and are fixedly connected to the anti - detachment plates. A return spring (26) is movably sleeved on the rod body of the suspension rod (25) between the outer end face of the anti - detachment plate and the inner wall of the fixed groove.

6. The feeding device of a double-sided digital printing machine according to claim 1, characterized in that: A number of stabilizing balls are equidistantly and rotatably clamped on the circumferential sides at both ends of the inner ring wall of the side baffle ring plate (5), and the exposed ball bodies of the stabilizing balls are movably abutted against the outer wall of the feeding roller (4).

7. The feeding device of a double-sided digital printing machine according to claim 5, characterized in that: A first magnetic block (18) is horizontally fixedly connected to the outer end face of the positioning insertion rod (17). A second magnetic block (19) with a magnetic pole opposite to that of the first magnetic block (18) is horizontally arranged on the inner wall of the outer end of the storage groove. A handle rod is horizontally fixedly connected to the rod body of the outer side face of the positioning insertion rod (17). A strip - shaped opening is vertically formed on the inner wall of the outer end of the storage groove, and the outer end of the handle rod extends out from the strip - shaped opening.

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