A fully automatic lithographic printing press

Abstract

The application discloses a full-automatic lithographic printing machine, which clamps printing cylinder paper rolls between printing paper cylinder clamping assemblies, can clamp printing cylinder paper rolls with different diameters through the printing paper cylinder clamping assemblies, can clamp printing cylinder paper rolls with different lengths through starting horizontal sliding groove assemblies, realizes automatic adaptation to printing cylinder paper rolls with different sizes, automatically guides printing paper onto a workbench through a guide-in roller assembly, then moves a movable gantry below a first gantry end support to the lower side of the first gantry end support, clamps one end of the printing paper through starting a printing paper clamping and cutting assembly, clamps and tightens the other end of the printing paper through a printing paper tensioning mechanism at the bottom of the first gantry end support, adjusts a printing head through starting a gantry adjusting sliding groove assembly and a horizontal adjusting assembly, performs printing through the printing head, and realizes the function of guiding out the printing paper through starting the printing paper tensioning mechanism again after the printing is completed.

Description

Technical Field

[0001] This invention relates to a printing press, and more particularly to a fully automatic offset printing press, belonging to the field of printing press technology. Background Technology

[0002] A printing press disclosed in the prior art with application number CN201711201247.X includes a device for fluid coating of a printing substrate by means of a roller and a removal device for removing fluid from the roller portion;

[0003] The removal device has at least one section that can be adjusted according to different specifications of the substrate. The section can be a roller pressing section or a suction section. This technical solution can achieve adjustment settings for different specifications, but it cannot adaptably adjust and clamp the provided printing paper roller. In addition, it cannot conveniently and automatically feed the printing paper and then press and cut it. Furthermore, it cannot tension the printing paper or export the printing paper. Therefore, a fully automatic offset printing machine is designed to solve the above problems. Summary of the Invention

[0004] The main objective of this invention is to provide a fully automatic offset printing machine.

[0005] The objective of this invention can be achieved by adopting the following technical solution:

[0006] A fully automatic offset printing machine includes a worktable, gantry adjustment slide assemblies installed on both sides of the worktable, and a movable gantry frame that moves along the gantry adjustment slide assembly.

[0007] The movable gantry is equipped with a horizontal adjustment component, and the output end of the horizontal adjustment component is equipped with a printing head driven by the horizontal adjustment component.

[0008] One end of the worktable has a through slot, and a printing paper pressing and cutting component is provided at the top of the worktable and at the top and bottom of the through slot.

[0009] The bottom end of the workbench is equipped with a horizontal slide rail assembly via an L-shaped bracket. The horizontal slide rail assembly is equipped with a printing paper roll clamping assembly for clamping the printing paper roll.

[0010] A first gantry end frame is installed at the top of the other end of the workbench, and a paper tightening mechanism is installed on the inner top of the first gantry end frame.

[0011] An infeed roller assembly for guiding the printing paper is located between the worktable and the printing roll.

[0012] Preferably, the gantry adjusting slide rail assembly includes a side slide rail, a movable gantry adjusting screw, an end adjusting motor and a synchronous transmission assembly of I-beam wheels, and a gantry moving slider;

[0013] Side sliding grooves are installed on both sides of the workbench. A movable gantry adjustment screw is installed through the side sliding groove. A gantry moving slider is sleeved on the outside of the movable gantry adjustment screw and engaged with it. A movable gantry is installed on the top of the gantry moving slider.

[0014] The outer end of the adjusting screw of the movable gantry is equipped with a synchronous transmission assembly of I-shaped wheels, and the synchronous transmission assembly of I-shaped wheels and the adjusting screw of the movable gantry are driven by the end adjusting motor.

[0015] Preferably, the horizontal slide rail assembly includes an end horizontal slide rail, a horizontal adjustment motor, and an inner lateral adjustment screw;

[0016] The outer end of the L-shaped bracket is equipped with an end horizontal slide groove, and a horizontal adjustment motor is installed at the outer end of the end horizontal slide groove. The output end of the horizontal adjustment motor passes through the end horizontal slide groove and is equipped with an inner lateral adjustment screw. A printing paper tube clamping assembly is engaged on the outside of the inner lateral adjustment screw.

[0017] Preferably, the synchronous transmission assembly for the I-beam pulley includes a driven I-beam pulley, a transmission belt, a driving I-beam pulley, and an L-shaped motor frame;

[0018] One set of movable gantry adjusting screws is equipped with driven torpedo wheels at the end, and another set of movable gantry adjusting screws is equipped with driving torpedo wheels at the end. An L-shaped motor frame is installed at the bottom end of the gantry moving slider. An end adjusting motor is installed inside the L-shaped motor frame. The output end of the end adjusting motor is fixed to the end of the driving torpedo wheel. A transmission belt is sleeved on the outside of the driving and driven torpedo wheels.

[0019] Preferably, the horizontal adjustment assembly includes an end motor and an internal screw;

[0020] An internal screw is installed inside the movable gantry along its axial direction, and an end motor is installed at the outer end of the movable gantry. The output end of the end motor passes through the internal screw installed in the movable gantry.

[0021] Preferably, the printing paper holding and cutting assembly includes a second gantry end frame, a third electric lifting rod, a cutting blade, a second electric lifting rod, a printing paper holding strip, and a bottom gantry frame;

[0022] A second gantry end frame is installed at the top of the workbench and above the through-strip opening. A third electric lifting rod is installed at the top center of the second gantry end frame, and a printing paper holding strip is installed at the output end of the third electric lifting rod.

[0023] A bottom gantry is installed at the end of the workbench and below the through-strip opening. A second electric lifting rod is installed in the top center of the bottom gantry, and a cutting blade is installed at the output end of the second electric lifting rod.

[0024] Preferably, the printing paper tube clamping assembly includes a clamping disc, a clamping motor, an inner clamping screw, an adjusting clamping plate, a driven bevel gear, a driving bevel gear, and a sliding frame;

[0025] The outer side of the inner lateral adjusting screw is engaged with a sliding frame, and a clamping plate is installed on the outer top of the sliding frame. A clamping motor is fixed in the outer middle of the clamping plate, and the output end of the clamping motor is installed with a drive bevel gear through the clamping plate.

[0026] The driven bevel gear meshes with the outer side of the driving bevel gear. An inner clamping screw is installed at the middle of the outer end of the driven bevel gear, and an adjusting clamping plate meshes with the outer side of the inner clamping screw. The adjusting clamping plate clamps the printing roll paper.

[0027] Preferably, the printing paper tensioning mechanism includes a first electric lifting rod, a lifting groove bar, and a tensioning roller assembly;

[0028] A first electric lifting rod is installed in the middle of the inner top of the first gantry end frame. A lifting groove is installed at the output end of the first electric lifting rod, and tensioning roller assemblies are installed at both ends of the inner top of the lifting groove.

[0029] Preferably, the tensioning roller assembly includes a U-shaped inner slide groove, an inner sliding section, an inner limit spring, an outer sliding cylinder, a multi-shaped sliding frame, a tensioning roller, and a tensioning motor;

[0030] Both ends of the inner top of the lifting groove are equipped with U-shaped inner sliding grooves. Several sliding frames are slidably arranged inside the U-shaped inner sliding grooves, and an inner sliding assembly is installed on the top of the several sliding frames. An outer sliding cylinder is installed on the inner top of the U-shaped inner sliding groove, and an inner limit spring is provided between the outer sliding cylinder and the inner sliding assembly.

[0031] Several types of sliding frames are equipped with a pressure tensioning wheel on the inner side, and a tensioning motor that drives the pressure tensioning wheel to move is provided on the outer side of the several types of sliding frames.

[0032] Preferably, the paper guide roller assembly includes a paper guide motor, a drive gear, a driven gear, an upper paper guide roller, and a lower paper guide roller;

[0033] The upper printing paper guide roller and the lower printing paper guide roller are provided on the top inner side of the L-shaped bracket, and the driving gear and the driven gear are respectively installed through the L-shaped bracket at the outer ends of the upper printing paper guide roller and the lower printing paper guide roller.

[0034] A printing paper feeding motor that drives the active gear is installed on the outside of the L-shaped bracket;

[0035] The mobile gantry is equipped with a controller on its side and support legs at the four corners of the bottom of the workbench.

[0036] Beneficial technical effects of the present invention:

[0037] This invention provides a fully automatic offset printing machine that clamps printing rolls between printing roll clamping components. The printing roll clamping components can clamp printing rolls of different diameters, and the horizontal slide chute component can clamp printing rolls of different lengths, achieving automatic adaptation to printing rolls of different sizes. The printing paper is automatically fed onto the worktable by the inlet roller component, and then moved to the bottom of the first gantry end frame by the printing paper pressing and cutting component. The printing paper is pressed at one end by the printing paper pressing and cutting component, and the other end of the printing paper is pressed and tightened by the printing paper tightening mechanism at the bottom of the first gantry end frame. The printing head is adjusted by activating the gantry adjusting slide chute component and the horizontal adjusting component, and printing is performed by the printing head. After printing is completed, the printing paper tightening mechanism is activated again to unload the printing paper. Attached Figure Description

[0038] Figure 1 This is a first-view perspective three-dimensional structural diagram of a preferred embodiment of a fully automatic offset printing machine according to the present invention.

[0039] Figure 2 This is a second-view perspective three-dimensional structural diagram of the overall device of a preferred embodiment of a fully automatic offset printing machine according to the present invention.

[0040] Figure 3 This is a third-view perspective three-dimensional structural diagram of a preferred embodiment of a fully automatic offset printing machine according to the present invention.

[0041] Figure 4 This is a fourth-view perspective three-dimensional structural diagram of a preferred embodiment of a fully automatic offset printing machine according to the present invention.

[0042] Figure 5 This is an enlarged view of point a in the present invention.

[0043] Figure 6 This is a three-dimensional structural diagram of the paper clamping mechanism according to a preferred embodiment of a fully automatic offset printing machine of the present invention.

[0044] Figure 7 For the present invention Figure 3 Enlarged view of the structure at point b in the image.

[0045] Figure 8 This is a fourth-view perspective three-dimensional structural diagram of a preferred embodiment of a fully automatic offset printing machine according to the present invention.

[0046] Figure 9 This is a schematic diagram of the clamping disk assembly structure of a preferred embodiment of a fully automatic offset printing machine according to the present invention.

[0047] Figure 10 This is a three-dimensional structural diagram of the paper clamping mechanism according to a preferred embodiment of a fully automatic offset printing machine of the present invention.

[0048] Figure 11 For the present invention Figure 10 Enlarged view of the structure at point c.

[0049] Figure 12 This is a schematic diagram of a tension roller assembly structure according to a preferred embodiment of a fully automatic offset printing machine of the present invention.

[0050] In the diagram: 1. Workbench, 2. Moving gantry frame, 3. Tensioning motor, 4. Gantry frame moving slider, 5. Side slide groove, 6. Inclined guide plate, 7. Transmission belt, 8. Driven pulley, 9. Printing roll paper, 10. Controller, 11. L-shaped bracket, 12. Support leg, 13. End horizontal slide groove, 14. Horizontal adjustment motor, 15. Sliding frame, 16. Clamping plate, 17. L-shaped motor frame, 18. First gantry end frame, 19. Moving gantry frame adjusting screw, 20. Pressure tensioning wheel, 21. Driven pulley, 22. End adjustment motor, 23. Printing head, 24. Second gantry end frame, 25. Adjustment... 26. Clamping plate, 27. Lifting groove, 28. First electric lifting rod, 29. Printing paper guide motor, 30. Driven gear, 31. Upper printing paper guide roller, 32. Lower printing paper guide roller, 33. Bottom gantry, 34. Second electric lifting rod, 35. Cutting knife, 36. Third electric lifting rod, 37. Clamping motor, 38. Sliding frame, 39. Inner clamping screw, 40. Driven bevel gear, 41. Driven bevel gear, 42. U-shaped inner slide groove, 43. Outer sliding cylinder, 44. Inner sliding conduit, 45. Inner limit spring, 46. Through slot, 47. Printing paper pressing strip. Implementation

[0051] To enable those skilled in the art to understand the technical solution of the present invention more clearly, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0052] like Figures 1-12 As shown, this embodiment provides a fully automatic offset printing machine, including a worktable 1, gantry adjustment slide assemblies installed on both sides of the worktable 1, and a movable gantry frame 2 that moves along the gantry adjustment slide assembly is provided on the gantry adjustment slide assembly.

[0053] The movable gantry 2 is equipped with a horizontal adjustment component, and the output end of the horizontal adjustment component is equipped with a printing head 23 driven by the horizontal adjustment component;

[0054] One end of the workbench 1 is provided with a through slot 46, and a printing paper pressing and cutting assembly is provided at the top of the workbench 1 and at the top and bottom of the through slot 46.

[0055] A horizontal slide rail assembly is installed at the bottom end of the workbench 1 via an L-shaped bracket 11. A printing paper roll clamping assembly for clamping the printing paper roll 9 is provided on the horizontal slide rail assembly.

[0056] A first gantry end frame 18 is installed at the top of the other end of the workbench 1, and a printing paper tightening mechanism is installed on the inner top of the first gantry end frame 18.

[0057] An inlet roller assembly for guiding the printing paper is provided between the worktable 1 and the printing roll 9.

[0058] Overall working principle: The printing paper roll 9 is clamped between the printing paper roll clamping components. The printing paper roll clamping components can clamp printing paper rolls 9 of different diameters. By activating the horizontal slide chute component, printing paper rolls 9 of different lengths can be clamped, realizing automatic adaptation to printing paper rolls 9 of different sizes. The printing paper is automatically fed onto the worktable 1 through the inlet roller component. Then, the printing paper pressing and cutting component moves the gantry frame 2 to the bottom of the first gantry end frame 18. The printing paper pressing and cutting component is activated to press one end of the printing paper. The printing paper tightening mechanism at the bottom of the first gantry end frame 18 presses and tightens the other end of the printing paper. The printing head 23 is adjusted by activating the gantry adjusting slide chute component and the horizontal adjusting component. Printing is performed through the printing head 23. After printing is completed, the printing paper tightening mechanism is activated again to achieve the function of exporting the printing paper.

[0059] In this embodiment, the gantry adjustment slide rail assembly includes a side slide rail 5, a movable gantry frame adjustment screw 19, an end adjustment motor 22, a synchronous transmission assembly for I-beam wheels, and a gantry frame moving slider 4;

[0060] Side slide grooves 5 are installed on both sides of the workbench 1. A movable gantry adjustment screw 19 is installed through the side slide groove 5. A gantry movable slider 4 is sleeved and engaged on the outside of the movable gantry adjustment screw 19. A movable gantry 2 is installed on the top of the gantry movable slider 4.

[0061] The outer end of the movable gantry adjusting screw 19 is equipped with an I-shaped wheel synchronous transmission assembly, and the I-shaped wheel synchronous transmission assembly and the movable gantry adjusting screw 19 are driven by the end adjusting motor 22.

[0062] Local working principle: By adjusting the motor 22 at the starting end, the synchronous transmission assembly of the I-shaped wheel and the adjusting screw 19 of the moving gantry are driven, which in turn drives the two sets of adjusting screws 19 of the moving gantry to rotate. The moving slider 4 of the gantry is adjusted by adjusting the adjusting screws 19 of the moving gantry, which in turn adjusts the moving slider 4 of the gantry to move on the side slide groove 5, thereby realizing the adjustment and sliding of the moving gantry 2.

[0063] In this embodiment, the horizontal slide rail assembly includes an end horizontal slide rail 13, a horizontal adjustment motor 14, and an inner lateral adjustment screw;

[0064] The outer end of the L-shaped bracket 11 is equipped with an end horizontal slide groove 13, and a horizontal adjustment motor 14 is installed at the outer end of the end horizontal slide groove 13. The output end of the horizontal adjustment motor 14 passes through the end horizontal slide groove 13 and is equipped with an inner lateral adjustment screw. A printing paper tube clamping assembly is engaged on the outside of the inner lateral adjustment screw.

[0065] Local working principle: The horizontal adjustment motor 14 is started to drive the inner horizontal adjustment screw to move, and the inner horizontal adjustment screw drives the printing paper tube clamping assembly to clamp the printing paper roll 9.

[0066] In this embodiment, the I-beam synchronous transmission assembly includes a driven I-beam 8, a transmission belt 7, a driving I-beam 21, and an L-shaped motor frame 17;

[0067] A driven wheel 8 is installed at the end of one set of movable gantry adjusting screws 19, and a driving wheel 21 is installed at the end of another set of movable gantry adjusting screws 19. An L-shaped motor frame 17 is installed at the bottom end of the gantry moving slider 4. An end adjusting motor 22 is installed inside the L-shaped motor frame 17. The output end of the end adjusting motor 22 is fixed to the end of the driving wheel 21. A transmission belt 7 is sleeved on the outside of the driving wheel 21 and the driven wheel 8.

[0068] Partial working principle: The starting end adjusts the motor 22 to drive the active I-shaped wheel 21 to rotate, which in turn adjusts the transmission belt 7 to move, which in turn adjusts the driven I-shaped wheel 8 to move, and the driven I-shaped wheel 8 and the active I-shaped wheel 21 adjust the movement of the moving gantry adjusting screw 19 to achieve the function of driving the gantry moving slider 4 to move.

[0069] In this embodiment, the horizontal adjustment assembly includes an end motor and an inner screw;

[0070] An internal screw is provided inside the movable gantry frame 2 along the axial direction of the movable gantry frame 2, and an end motor is installed at the outer end of the movable gantry frame 2. The output end of the end motor passes through the internal screw installed in the movable gantry frame 2.

[0071] Local working principle: The motor at the starting end drives the internal screw to move, and the movement of the printing head 23 is adjusted by the internal screw.

[0072] In this embodiment, the printing paper pressing and cutting assembly includes a second gantry end frame 24, a third electric lifting rod 36, a cutting blade 35, a second electric lifting rod 34, a printing paper pressing strip 47, and a bottom gantry frame 33.

[0073] A second gantry end frame 24 is installed at the top of the workbench 1 and above the through slot 46. A third electric lifting rod 36 is installed at the top center of the second gantry end frame 24, and a printing paper holding strip 47 is installed at the output end of the third electric lifting rod 36.

[0074] A bottom gantry 33 is installed at the end of the workbench 1 and below the through slot 46. A second electric lifting rod 34 is installed in the top center of the bottom gantry 33. A cutting blade 35 is installed at the output end of the second electric lifting rod 34.

[0075] Local working principle: By activating the second electric lifting rod 34, the movement of the cutting blade 35 is adjusted. The cutting blade 35 can penetrate the through-slit 46 to cut the printing paper. By activating the third electric lifting rod 36, the printing paper holding plate 47 is driven to hold the printing paper and cooperate with the cutting blade 35 to perform better cutting function.

[0076] In this embodiment, the printing paper tube clamping assembly includes a clamping disk 16, a clamping motor 37, an inner clamping screw 39, an adjusting clamping plate 25, a driven bevel gear 40, a driving bevel gear 41, and a sliding frame 15;

[0077] A sliding frame 15 is engaged on the outer side of the inner transverse adjusting screw. A clamping plate 16 is installed on the outer top of the sliding frame 15. A clamping motor 37 is fixed in the outer middle of the clamping plate 16, and an active bevel gear 41 is installed through the clamping plate 16 at the output end of the clamping motor 37.

[0078] The driven bevel gear 40 meshes with the outer side of the driving bevel gear 41. An inner clamping screw 39 is installed at the middle of the outer end of the driven bevel gear 40, and an adjusting clamping piece 25 meshes with the outer side of the inner clamping screw 39. The adjusting clamping piece 25 clamps the printing roll paper 9.

[0079] Partial working principle: The clamping motor 37 is started to drive the active bevel gear 41 to move, which in turn drives the driven bevel gear 40 to move. The driven bevel gear 40 drives the inner clamping screw 39 to rotate, which in turn drives the adjusting clamping plate 25 to clamp the printing roll paper 9.

[0080] In this embodiment, the printing paper tensioning mechanism includes a first electric lifting rod 27, a lifting groove 26, and a tensioning roller assembly;

[0081] A first electric lifting rod 27 is installed in the middle of the inner top of the first gantry end frame 18. A lifting groove 26 is installed at the output end of the first electric lifting rod 27, and tensioning roller assemblies are installed at both ends of the inner top of the lifting groove 26.

[0082] Partial working principle: The first electric lifting rod 27 is activated to drive the first gantry end frame 18 to descend so that its tensioning roller assembly contacts the printing paper. Then, the tensioning roller assembly is activated to pull the printing paper to achieve the tensioning function. The first electric lifting rod 27 is activated again so that the bottom edge of its lifting groove 26 contacts the printing paper to achieve the pressing function of the printing paper.

[0083] In this embodiment, the tensioning roller assembly includes a U-shaped inner groove 42, an inner sliding conduit 44, an inner limiting spring 45, an outer sliding cylinder 43, a multi-shaped sliding frame 38, a tensioning roller 20, and a tensioning motor 34.

[0084] Both ends of the inner top of the lifting groove 26 are equipped with U-shaped inner sliding grooves 42. Several sliding frames 38 are slidably arranged inside the U-shaped inner sliding groove 42, and an inner sliding assembly 44 is installed on the top of the several sliding frames 38. An outer sliding cylinder 43 is installed on the inner top of the U-shaped inner sliding groove 42, and an inner limit spring 45 is provided between the outer sliding cylinder 43 and the inner sliding assembly 44.

[0085] The sliding frame 38 has a tensioning wheel 20 on its inner side and a tensioning motor 3 on its outer side to drive the tensioning wheel 20.

[0086] In this embodiment, the infeed roller assembly includes a printing paper infeed motor 28, a drive gear 29, a driven gear 30, an upper printing paper infeed roller 31, and a lower printing paper infeed roller 32.

[0087] The upper printing paper guide roller 31 and the lower printing paper guide roller 32 are provided on the top inner side of the L-shaped bracket 11, and the driving gear 29 and the driven gear 30 are respectively installed through the L-shaped bracket 11 at the outer ends of the upper printing paper guide roller 31 and the lower printing paper guide roller 32.

[0088] A printing paper feeding motor 28 that drives the active gear 29 is provided on the outside of the L-shaped bracket 11.

[0089] Local working principle: The printing paper feeding motor 28 is started to drive the active gear 29 to adjust the movement of the upper printing paper feeding roller 31. The active gear 29 adjusts the driven gear 30 to drive the movement of the lower printing paper feeding roller 32, thereby realizing the function of feeding printing paper.

[0090] In this embodiment, a controller 10 is provided on the side of the movable gantry frame 2, and support legs 12 are installed at the four corners of the bottom of the workbench 1.

[0091] The above are merely further embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope disclosed in the present invention, based on the technical solution and concept of the present invention, shall fall within the scope of protection of the present invention.

Claims

1. A fully automatic lithographic printing machine, characterized in that: The utility model provides a printing paper cutting device, which comprises a workbench (1), a movable gantry (2) is arranged on the both sides of the workbench (1) and is movably arranged on the movable gantry (2), a horizontal adjusting assembly is arranged in the movable gantry (2), the output end of the horizontal adjusting assembly is provided with a printing head (23) driven by the horizontal adjusting assembly, a through slot (46) is formed in one end of the workbench (1), a printing paper pressing and cutting assembly is arranged on the top end of the workbench (1) and is located at the top and bottom of the through slot (46), a horizontal sliding groove assembly is arranged on the bottom end of the workbench (1) through an L-shaped support (11), a printing paper cylinder clamping assembly is arranged on the horizontal sliding groove assembly and is used for clamping a printing cylinder roll paper (9), a first gantry end frame (18) is arranged on the other end of the workbench (1), a printing paper tensioning mechanism is arranged on the inner top of the first gantry end frame (18), and a guide roller assembly is arranged between the workbench (1) and the printing cylinder roll paper (9) and is used for guiding the printing paper. The printing paper pressing and cutting assembly comprises a second gantry end frame (24), a third electric lifting rod (36), a cutting knife (35), a second electric lifting rod (34), a printing paper pressing strip (47) and a bottom gantry (33), the second gantry end frame (24) is arranged on the top end of the workbench (1) and is located above the through slot (46), the third electric lifting rod (36) is arranged on the top middle part of the second gantry end frame (24), and the output end of the third electric lifting rod (36) is provided with the printing paper pressing strip (47), the bottom gantry (33) is arranged on the end of the workbench (1) and is located below the through slot (46), the second electric lifting rod (34) is arranged on the inner top middle part of the bottom gantry (33), and the output end of the second electric lifting rod (34) is provided with the cutting knife (35). The printing paper tensioning mechanism comprises a first electric lifting rod (27), a lifting groove strip (26) and a tensioning roller assembly, the first electric lifting rod (27) is arranged on the inner top middle part of the first gantry end frame (18), the output end of the first electric lifting rod (27) is provided with the lifting groove strip (26), and the tensioning roller assembly is arranged on the inner top of the lifting groove strip (26). The tensioning roller assembly comprises a U-shaped inner sliding groove (42), an inner sliding guide (44), an inner limiting spring (45), an outer sliding cylinder (43), a several-shaped sliding frame (38), a pressing tensioning wheel (20) and a tensioning motor (3). The inner top of the lifting groove strip (26) is provided with the U-shaped inner sliding groove (42), the several-shaped sliding frame (38) is slidably arranged in the U-shaped inner sliding groove (42), the inner top of the U-shaped inner sliding groove (42) is provided with the outer sliding cylinder (43), the inner limiting spring (45) is arranged between the outer sliding cylinder (43) and the inner sliding guide (44), the inner side of the several-shaped sliding frame (38) is provided with the pressing tensioning wheel (20), and the outer side of the several-shaped sliding frame (38) is provided with the tensioning motor (3) used for driving the pressing tensioning wheel (20) to move.

2. A fully automatic lithographic printing machine according to claim 1, characterized in that: The side sliding groove (5), the moving gantry adjusting screw (19), the end adjusting motor (22), the H-shaped wheel synchronous transmission assembly and the gantry moving slider (4) are arranged on the workbench (1).

3. A fully automatic lithographic printing machine according to claim 2, characterized in that: The end horizontal sliding groove (13), the horizontal adjusting motor (14) and the inner transverse adjusting screw are arranged on the L-shaped support (11).

4. A fully automatic lithographic printing machine according to claim 3, characterized in that: The driven H-shaped wheel (8), the transmission belt (7), the driving H-shaped wheel (21) and the L-shaped motor support (17) are arranged on the gantry moving slider (4).

5. A fully automatic lithographic printing machine according to claim 4, characterized in that: The end motor and the inner screw are arranged on the moving gantry (2).

6. The fully automatic lithographic printing machine according to claim 1, characterized in that: The clamping disc (16), the clamping motor (37), the inner clamping screw (39), the adjusting clamping piece (25), the driven bevel gear (40), the driving bevel gear (41) and the sliding support (15) are arranged on the inner transverse adjusting screw.

7. The fully automatic lithographic printing machine according to claim 1, characterized in that: The paper guide roller assembly comprises a printing paper guide motor (28), a driving gear (29), a driven gear (30), an upper printing paper guide roller (31) and a lower printing paper guide roller (32); the upper printing paper guide roller (31) and the lower printing paper guide roller (32) are arranged at the top of the inner side of the L-shaped support (11), and the driving gear (29) and the driven gear (30) are respectively arranged at the outer ends of the upper printing paper guide roller (31) and the lower printing paper guide roller (32) and penetrate through the L-shaped support (11); the printing paper guide motor (28) for driving the driving gear (29) is arranged at the outer side of the L-shaped support (11); the controller (10) is arranged at the side of the movable gantry (2), and the supporting legs (12) are arranged at the bottom of the workbench (1).

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