Short-distance double-sided printing device

Abstract

A short-distance double-sided printing device comprises an inclined printing part and a vertical printing part, a first material roller is arranged on one side of the inclined printing part and one side of the vertical printing part, and a second material roller is arranged on the other side of the inclined printing part and the other side of the vertical printing part. And the oblique printing part comprises an oblique printing platform which is obliquely arranged and an oblique printer which is matched with the oblique printing platform. The oblique printing part and the vertical printing part are arranged in a matched mode, the distance between the two printing platforms can be reduced to the maximum degree no matter whether the printing platforms are oblique or vertical, meanwhile, due to oblique and vertical matching and small-angle contact of a steering roller part, the printing efficiency is greatly improved, and the printing efficiency is improved. The influence on the extension effect of the printed substrate is reduced as much as possible, and the printing effect is guaranteed.

Description

Technical Field

[0001] The present application relates to a short-distance double-sided printing device. Background Art

[0002] Double-sided printing refers to flipping the printing on both sides of a printing substrate, so that the printing on both sides of the printing substrate forms a symmetrical setting, which can be used for structures such as light boxes and has a better display effect. Currently, printing mostly uses two horizontal support platforms, and then uses guide rollers to turn between the two horizontal support platforms to finally complete the printing operation between the two sides. However, in this way, the distance stretched by the printing substrate between the two platforms is too long, which affects the printing accuracy of the printing substrate. In order to avoid the above problems as much as possible, there are some structures that use two inclined platforms, and then turn directly between the two inclined platforms, but this oblique printing method will affect the extension effect of the printed substrate during inkjet printing, which ultimately affects the presentation effect and accuracy after printing. Utility Model Content

[0003] In order to solve the above problems, the present application discloses a short-distance double-sided printing device, including an oblique printing part and a vertical printing part, wherein a first material roller is arranged on one side of the oblique printing part and the vertical printing part, and a second material roller is arranged on the other side; the oblique printing part includes an oblique printing platform arranged obliquely and an oblique printer arranged in cooperation with the oblique printing platform, and the vertical printing part includes a vertically arranged vertical printing platform and a vertical printer arranged in cooperation with the vertical printing platform; a steering roller that cooperates with the oblique printing platform and the vertical printing platform is arranged between the oblique printing platform and the vertical printing platform; a first support roller is arranged on the other side of the oblique printing platform relative to the steering roller; and a second support roller is arranged on the other side of the vertical printing platform relative to the steering roller.

[0004] Preferably, the steering roller is provided with a first import position for exporting the printed substrate from the oblique printing platform and a second import position for importing it to the vertical printing platform, or the steering roller is provided with a first import position for importing the printed substrate to the oblique printing platform and a second import position for exporting it from the vertical printing platform; the angle formed by the first import position and the second import position is α, 0°<α<90°. The present application adopts the coordinated setting of the oblique printing part and the vertical printing part, whether it is the oblique first or the vertical first, the distance between the two printing platforms can be reduced to the greatest extent. At the same time, due to the coordination of the oblique and vertical, and the contact of the steering roller part at a small angle, the influence on the extension effect of the printed substrate is reduced as much as possible, and the printing effect is guaranteed.

[0005] Preferably, 45°≤α≤60°.

[0006] Preferably, the contact position of the first support roller with the printing substrate adjacent to the oblique printing platform and the first introduction position are arranged on the same side relative to the plane where the oblique printing platform is located, and the angle formed by the section where the contact position is located and the oblique printing platform is the same as the angle formed by the section where the first introduction position is located and the oblique printing platform. The extension direction thereof is arranged away from the oblique printing platform.

[0007] Preferably, the contact position of the second support roller with the printing substrate adjacent to the vertical printing platform is arranged on the same side as the second introduction position relative to the plane where the vertical printing platform is located, and the angle formed by the section where the contact position is located and the vertical printing platform is the same as the angle formed by the section where the second introduction position is located and the vertical printing platform. The extension direction thereof is arranged away from the vertical printing platform.

[0008] Preferably, a first cloth guide roller is arranged between the side of the first support roller away from the oblique printing platform and the first material roller, the first cloth guide roller is provided with a first cloth guide abutment portion arranged to contact the printing substrate, and the upper part of the first support roller is provided with a first support abutment portion arranged to contact the printing substrate.

[0009] Preferably, the center angle of the first cloth guide roller corresponding to the first cloth guide abutment portion is A, A≤90°, and the center angle of the first support roller corresponding to the first support abutment portion is B, B≤90°; A≤B. The present application controls the position of the first support roller by the first cloth guide roller, that is, limits its position of entering the oblique printing platform. The first support roller adopts a relatively large contact angle to prevent the printed substrate from slipping and wrinkling, thereby providing a basis for turning from the turning roller at a small angle.

[0010] Preferably, a second cloth guide roller is arranged between the second support roller on the side away from the vertical printing platform and the second material roller, the second cloth guide roller is provided with a second cloth guide abutment portion arranged to contact the printing substrate, and the second support roller is provided with a second support abutment portion arranged to contact the printing substrate.

[0011] Preferably, the center angle of the second supporting roller corresponding to the second supporting abutment portion is D, D≤180°, and the center angle of the second cloth guiding roller corresponding to the second cloth guiding abutment portion is C, C≤90°; C≤D;

[0012] The second cloth guide roller is a cloth clamping roller that can abut against or move away from the second support roller; the steering roller and the second support roller are active rollers; the first support roller and the first cloth guide roller are aluminum rollers, and the weight of the aluminum rollers used is 1 / 3 of the corresponding steel rollers. The second cloth guide roller of the present application adopts the form of a cloth clamping roller, which is convenient for loading and targeted tension adjustment for different printing substrates, thereby providing a structural basis for improving printing accuracy.

[0013] The first support roller and steering roller of the present application are arranged in cooperation with the oblique printing platform, and the small-angle design of the second support roller and the second cloth guide roller is arranged in cooperation with the vertical printing platform, so that the feeding of the printing substrate can be relatively accurately controlled, providing a basis for the printing accuracy of the oblique printing platform and the vertical printing platform using the oblique printer and the vertical printer, making the present application suitable for the operating environment of the printing substrate and ink with high ductility and low smudging.

[0014] This application can bring the following beneficial effects:

[0015] 1. The present application adopts a coordinated arrangement of an oblique printing section and a vertical printing section. Regardless of whether it is the oblique printing section first or the vertical printing section first, the distance between the two printing platforms can be reduced to the greatest extent. At the same time, due to the coordination of the oblique and vertical printing sections, and the contact of the steering roller section at a small angle, the influence on the extension effect of the printed substrate can be reduced as much as possible, thereby ensuring the printing effect.

[0016] 2. The present application controls the position of the first cloth guide roller to enter the first support roller, that is, to limit its entry to the position of the oblique printing platform. The first support roller adopts a relatively large contact angle to prevent the printed substrate from slipping and wrinkling, thereby providing a basis for a small angle turn from the steering roller.

[0017] 3. The first support roller and steering roller of the present application are arranged in cooperation with the oblique printing platform, and the small angle design of the second support roller and the second cloth guide roller are arranged in cooperation with the vertical printing platform, so that the feeding of the printing substrate can be relatively accurately controlled, providing a basis for the printing accuracy of the oblique printing platform and the vertical printing platform using the oblique printer and the vertical printer, making the present application suitable for the operating environment of the printing substrate and ink with high ductility and low smudging. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 A schematic diagram of this application.

[0020] Figure 2 This is a schematic diagram of some printed patterns in the examples of this application. DETAILED DESCRIPTION

[0021] In order to clearly illustrate the technical features of the present solution, the present application is described in detail below through specific implementation methods and in conjunction with the accompanying drawings.

[0022] The present application discloses a short-distance double-sided printing device, and the printing method is actually a method for using the device.

[0023] like Figure 1 A short-distance double-sided printing device is shown, comprising an oblique printing section 1 and a vertical printing section 2, wherein a first material roller 3 is provided on one side of the oblique printing section 1 and the vertical printing section 2, and a second material roller 4 is provided on the other side; the oblique printing section 1 comprises an oblique printing platform 5 arranged obliquely and an oblique printer 6 arranged in cooperation with the oblique printing platform 5, and the vertical printing section 2 comprises a vertically arranged vertical printing platform 7 and a vertical printer 8 arranged in cooperation with the vertical printing platform 7; a steering roller 9 is provided between the oblique printing platform 5 and the vertical printing platform 7 to cooperate with the oblique printing platform 5 and the vertical printing platform 7.

[0024] For the steering roller 9 part, the steering roller 9 is provided with a first import position 11 for exporting the printing substrate 10 from the oblique printing platform 5 and a second import position 12 for importing it to the vertical printing platform 7, or the steering roller 9 is provided with a first import position 11 for importing the printing substrate 10 to the oblique printing platform 5 and a second import position 12 for exporting it from the vertical printing platform 7; the angle formed by the first import position 11 and the second import position 12 is α, 0°<α<90°.

[0025] A more preferred angle α is: 45°≤α≤60°. α is set to a small acute angle structure, which can minimize the contact area between the steering roller 9 of the present application and the printing substrate 10, and cooperate with the vertical setting of the vertical printing platform 7 to achieve smooth flipping of the printing substrate 10 between the oblique printing platform and the vertical printing platform.

[0026] For the auxiliary support roller part, a first support roller 13 is arranged on the other side of the oblique printing platform 5 relative to the steering roller 9; the contact position of the first support roller 13 and the printing substrate 10 adjacent to the oblique printing platform and the first introduction position are arranged on the same side relative to the plane where the oblique printing platform is located, and the angle formed by the section where the contact position is located and the oblique printing platform is the same as the angle formed by the section where the first introduction position is located and the oblique printing platform.

[0027] A second supporting roller 20 is arranged on the other side of the vertical printing platform 7 relative to the steering roller 9; the contact position between the second supporting roller and the printing substrate adjacent to the vertical printing platform is arranged on the same side as the second introduction position relative to the plane where the vertical printing platform is located, and the angle formed by the section where the contact position is located and the vertical printing platform is the same as the angle formed by the section where the second introduction position is located and the vertical printing platform.

[0028] A first cloth guide roller 14 is arranged between the first support roller 13 and the first material roller 3 on the side away from the oblique printing platform 5, and a first cloth guide abutment portion 15 arranged in contact with the printing substrate 10 is arranged on the first cloth guide roller 14, and a first support abutment portion 16 arranged in contact with the printing substrate 10 is arranged on the upper part of the first support roller 13.

[0029] For the material feeding and discharging part, the center angle of the first cloth guide roller 14 corresponding to the first cloth guide abutment part 15 is A, A≤90°, and the center angle of the first support roller 13 corresponding to the first support abutment part 16 is B, B≤90°; A≤B. The definition of angles A and B in this application is actually the positional relationship between the first cloth guide roller 14 and the first support roller 13. The first support roller 13 adopts a relatively large angle contact state to play a role in flattening and supporting the cloth, so that it can enter the inclined printing platform in a better state.

[0030] A second cloth guide roller 17 is arranged between the second support roller 20 on the side away from the vertical printing platform 7 and the second material roller 4, the second cloth guide roller 17 is provided with a second cloth guide abutment portion 18 arranged to contact the printing substrate 10, and the second support roller 20 is provided with a second support abutment portion 19 arranged to contact the printing substrate 10.

[0031] The center angle of the second supporting roller 20 corresponding to the second supporting abutment portion 19 is D, D≤180°, and the center angle of the second cloth guiding roller 17 corresponding to the second cloth guiding abutment portion 18 is C, C≤90°; C≤D;

[0032] The second cloth guide roller 17 is a cloth clamping roller that can abut against or move away from the second support roller 20, and the steering roller 9 and the second support roller 20 are active rollers; the first support roller 13 and the first cloth guide roller 14 are aluminum rollers, and the weight of the aluminum rollers used is 1 / 3 of the corresponding steel rollers. The C and D angles defined in this application are actually the upper and lower left and right positional relationships of the second cloth guide roller 17 and the second support roller 20. Both are in a state of small angle contact, and can cooperate with the vertical printing platform 7. Since the printed substrate 10 is in a vertical state, the printed substrate 10 can be flattened and tensioned more conveniently.

[0033] In specific use, the direction of feeding and receiving materials is not limited: the following steps are included:

[0034] Select one of the first material roller 3 or the second material roller 4 as the feeding roller and the other as the receiving roller;

[0035] Then, the first material roller 3 or the second material roller 4 as the feeding roller is introduced into the adjacent first printing section or the second printing section, and enters into another printing section through the turning roller 9, and finally the material is collected from the part as the receiving roller;

[0036] The angle between the plane where the printing substrate 10 on the oblique printing platform 5 is located and the plane where the printing substrate 10 on the vertical printing platform 7 is located is β, 90<β<180°.

[0037] Embodiment 1:

[0038] S101. With the first material roller 3 as the feeding roller and the second material roller 4 as the receiving roller, a 1m wide PVC coil is set on the first material roller 3;

[0039] S102. Then the PVC coil is introduced from the first material roller 3 as a feeding roller to the bottom of the first cloth guide roller 14, then turned over to the top of the first support roller 13, and then enters the oblique printing platform, and enters the vertical printing platform after being turned over by the steering roller 9, and then enters the side of the second support roller 20, and then passes through the second support roller 20 and the second cloth guide roller under the guidance and clamping of the second cloth guide roller 17 to enter the second material roller 4 as a receiving roller;

[0040] The steering roller 9 and the second supporting roller 20 are active rollers; the first supporting roller 13 and the first cloth guide roller 14 are aluminum rollers, and the weight of the aluminum rollers used is 1 / 3 of the corresponding steel rollers;

[0041] A is 45°, B is 60°;

[0042] C is 25°, D is 165°;

[0043] α is 45°, β is 135°;

[0044] S103. Set the print pattern (such as Figure 2 As shown): the front and back sides are both set to be evenly distributed and overlapped circles, the outer diameter of the circle is 10 mm, a right cross mark is set in the middle, the spacing between adjacent circles is 10 mm, the line width is 0.2 mm, the front side of the PVC coil is printed by the first printer, the back side of the PVC coil is printed by the second printer, and then the final product is obtained by winding it through the second material roller 4, and a 1m long PVC coil is taken for light transmission observation, and the number of marked circles with right crosses with obvious deviations is recorded. If there is any doubt about whether there is a deviation, measurement is performed. If the offset distance of the right cross exceeds 1mm, it is determined to be a deviation.

[0045] S104. Verify whether the color blocks overlap or not. There is no deviation in the marked circle with a right cross. The maximum deviation is measured to be 0.2 mm.

[0046] Embodiment 2:

[0047] S201. Using the second material roller 4 as the feeding roller and the first material roller 3 as the receiving roller, the 1m wide PVC coil is set on the second material roller 4;

[0048] S202. The PVC coil is then introduced from the second material roller 4 as a feeding roller to between the second cloth guide roller 17 and the second support roller 20, and then enters the vertical printing platform, and enters the oblique printing platform after being turned over by the steering roller 9, and then enters above the first support roller 13, and then enters the first material roller 3 as a receiving roller under the guidance of the first cloth guide roller 14;

[0049] The steering roller 9 and the second supporting roller 20 are active rollers; the first supporting roller 13 and the first cloth guide roller 14 are aluminum rollers, and the weight of the aluminum rollers used is 1 / 3 of the corresponding steel rollers;

[0050] A is 45°, B is 60°;

[0051] C is 25°, D is 165°;

[0052] α is 45°, β is 135°;

[0053] S203. Set the print pattern (such as Figure 2 As shown): the front and back sides are both set to be evenly distributed and overlapped circles, the outer diameter of the circle is 10 mm, a right cross mark is set in the middle, the spacing between adjacent circles is 10 mm, the line width is 0.2 mm, the back side of the PVC coil is printed by the second printer, the front side of the PVC coil is printed by the first printer, and then the final product is obtained by winding it through the first material roller 3, and a 1m long PVC coil is taken for light transmission observation, and the number of marked circles with right crosses with obvious deviations is recorded. If there is any doubt about whether there is a deviation, measurement is performed. If the offset distance of the right cross exceeds 1mm, it is determined to be a deviation.

[0054] S204. Verify whether the color blocks overlap or not. There is no deviation in the marked circle with a right cross. The maximum deviation is measured to be 0.3 mm.

[0055] Embodiment 3:

[0056] S301. Using the first material roller 3 as the feeding roller and the second material roller 4 as the receiving roller, the 1m wide PVC coil is set on the first material roller 3;

[0057] S302. Then the PVC coil is introduced from the first material roller 3 as a feeding roller to the bottom of the first cloth guide roller 14, then turned over to the top of the first support roller 13, and then enters the oblique printing platform, and enters the vertical printing platform after being turned over by the steering roller 9, and then enters the side of the second support roller 20, and then passes through the second support roller 20 and the second cloth guide roller under the guidance and clamping of the second cloth guide roller 17 and enters the second material roller 4 as a receiving roller;

[0058] The steering roller 9 and the second supporting roller 20 are active rollers; the first supporting roller 13 and the first cloth guide roller 14 are aluminum rollers, and the weight of the aluminum rollers used is 1 / 3 of the corresponding steel rollers;

[0059] A is 45°, B is 60°;

[0060] C is 25°, D is 165°;

[0061] α is 60°, β is 135°;

[0062] S303. Set the print pattern (such as Figure 2 As shown): the front and back sides are both set to be evenly distributed and overlapped circles, the outer diameter of the circle is 10 mm, a right cross mark is set in the middle, the spacing between adjacent circles is 10 mm, the line width is 0.2 mm, the front side of the PVC coil is printed by the first printer, the back side of the PVC coil is printed by the second printer, and then the final product is obtained by winding it through the second material roller 4, and a 1m long PVC coil is taken for light transmission observation, and the number of marked circles with right crosses with obvious deviations is recorded. If there is any doubt about whether there is a deviation, measurement is performed. If the offset distance of the right cross exceeds 1mm, it is determined to be a deviation.

[0063] S304. Verify whether the color blocks overlap or not. There is no deviation in the marked circle with a right cross. The maximum deviation is measured to be 0.3 mm.

[0064] Embodiment 4:

[0065] S401. Using the first material roller 3 as the feeding roller and the second material roller 4 as the receiving roller, the 1m wide PVC coil is set on the first material roller 3;

[0066] S402. Then the PVC coil is introduced from the first material roller 3 as a feeding roller to the bottom of the first cloth guide roller 14, then turned over to the top of the first support roller 13, and then enters the oblique printing platform, and enters the vertical printing platform after being turned over by the steering roller 9, and then enters the side of the second support roller 20, and then passes through the second support roller 20 and the second cloth guide roller under the guidance and clamping of the second cloth guide roller 17 and enters the second material roller 4 as a receiving roller;

[0067] The steering roller 9 and the second supporting roller 20 are active rollers; the first supporting roller 13 and the first cloth guide roller 14 are aluminum rollers, and the weight of the aluminum rollers used is 1 / 3 of the corresponding steel rollers;

[0068] A is 45°, B is 60°;

[0069] C is 25°, D is 165°;

[0070] α is 75°, β is 135°;

[0071] S403. Set the print pattern (such as Figure 2 As shown): the front and back sides are both set to be evenly distributed and overlapped circles, the outer diameter of the circle is 10 mm, a right cross mark is set in the middle, the spacing between adjacent circles is 10 mm, the line width is 0.2 mm, the front side of the PVC coil is printed by the first printer, the back side of the PVC coil is printed by the second printer, and then the final product is obtained by winding it through the second material roller 4, and a 1m long PVC coil is taken for light transmission observation, and the number of marked circles with right crosses with obvious deviations is recorded. If there is any doubt about whether there is a deviation, measurement is performed. If the offset distance of the right cross exceeds 1mm, it is determined to be a deviation.

[0072] S404. Verify whether the color blocks overlap or not. There is no deviation in the marked circle with a right cross. The maximum deviation is measured to be 0.8 mm.

[0073] Embodiment 5:

[0074] S501. Using the first material roller 3 as the feeding roller and the second material roller 4 as the receiving roller, the 1m wide PVC coil is set on the first material roller 3;

[0075] S502. Then the PVC coil is introduced from the first material roller 3 as a feeding roller to the bottom of the first cloth guide roller 14, then turned over to the top of the first support roller 13, and then enters the oblique printing platform, and enters the vertical printing platform after being turned over by the steering roller 9, and then enters the side of the second support roller 20, and then passes through the second support roller 20 and the second cloth guide roller under the guidance and clamping of the second cloth guide roller 17 and enters the second material roller 4 as a receiving roller;

[0076] The steering roller 9 and the second supporting roller 20 are active rollers; the first supporting roller 13 and the first cloth guide roller 14 are aluminum rollers, and the weight of the aluminum rollers used is 1 / 3 of the corresponding steel rollers;

[0077] A is 70°, B is 60°;

[0078] C is 25°, D is 165°;

[0079] α is 45°, β is 135°;

[0080] S503. Set the print pattern (such as Figure 2 As shown): the front and back sides are both set to be evenly distributed and overlapped circles, the outer diameter of the circle is 10 mm, a right cross mark is set in the middle, the spacing between adjacent circles is 10 mm, the line width is 0.2 mm, the front side of the PVC coil is printed by the first printer, the back side of the PVC coil is printed by the second printer, and then the final product is obtained by winding it through the second material roller 4, and a 1m long PVC coil is taken for light transmission observation, and the number of marked circles with right crosses with obvious deviations is recorded. If there is any doubt about whether there is a deviation, measurement is performed. If the offset distance of the right cross exceeds 1mm, it is determined to be a deviation.

[0081] S504. Verify whether the color blocks overlap or not, and there are deviations in 12 marked circles with right crosses.

[0082] Embodiment 6:

[0083] S601. Using the first material roller 3 as the feeding roller and the second material roller 4 as the receiving roller, the 1m wide PVC coil is set on the first material roller 3;

[0084] S602. Then the PVC coil is introduced from the first material roller 3 as a feeding roller to the bottom of the first cloth guide roller 14, then turned over to the top of the first support roller 13, and then enters the oblique printing platform, and enters the vertical printing platform after being turned over by the steering roller 9, and then enters the side of the second support roller 20, and then passes through the second support roller 20 and the second cloth guide roller under the guidance and clamping of the second cloth guide roller 17 and enters the second material roller 4 as a receiving roller;

[0085] The steering roller 9 and the second supporting roller 20 are active rollers; the first supporting roller 13 and the first cloth guide roller 14 are aluminum rollers, and the weight of the aluminum rollers used is 1 / 3 of the corresponding steel rollers;

[0086] A is 45°, B is 60°;

[0087] C is 120°, D is 110°;

[0088] α is 45°, β is 135°;

[0089] S603. Set the print pattern (such as Figure 2As shown): the front and back sides are both set to be evenly distributed and overlapped circles, the outer diameter of the circle is 10 mm, a right cross mark is set in the middle, the spacing between adjacent circles is 10 mm, the line width is 0.2 mm, the front side of the PVC coil is printed by the first printer, the back side of the PVC coil is printed by the second printer, and then the final product is obtained by winding it through the second material roller 4, and a 1m long PVC coil is taken for light transmission observation, and the number of marked circles with right crosses with obvious deviations is recorded. If there is any doubt about whether there is a deviation, measurement is performed. If the offset distance of the right cross exceeds 1mm, it is determined to be a deviation.

[0090] S604. Verify whether the color blocks overlap or not. There are 50 marked circles with right crosses that have deviations.

[0091] Embodiment 7:

[0092] Based on Example 1, the first support roller 13 and the first cloth guide roller 14 are set as steel rollers, and the weight is 3 times that of the aluminum roller used in Example 1.

[0093] The final determination showed that 75 marked circles with right crosses had deviations.

[0094] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A short-distance double-sided printing device, characterized in that: It includes an oblique printing part and a vertical printing part, wherein a first material roller is arranged on one side of the oblique printing part and the vertical printing part, and a second material roller is arranged on the other side; the oblique printing part includes an oblique printing platform arranged obliquely and an oblique printer arranged in cooperation with the oblique printing platform, and the vertical printing part includes a vertical printing platform arranged vertically and a vertical printer arranged in cooperation with the vertical printing platform; a steering roller cooperating with the oblique printing platform and the vertical printing platform is arranged between the oblique printing platform and the vertical printing platform; a first supporting roller is arranged on the other side of the oblique printing platform relative to the steering roller; and a second supporting roller is arranged on the other side of the vertical printing platform relative to the steering roller.

2. A short-distance double-sided printing device as claimed in claim 1, characterized in that: The steering roller is provided with a first import position for exporting the printed substrate from the oblique printing platform and a second import position for importing it to the vertical printing platform, or the steering roller is provided with a first import position for importing the printed substrate to the oblique printing platform and a second import position for exporting it from the vertical printing platform; the angle formed by the first import position and the second import position is α, 0°<α<90°.

3. A short-distance double-sided printing device as claimed in claim 2, characterized in that: 45°≤α≤60°。 4. A short-distance double-sided printing device as claimed in claim 2, characterized in that: The contact position of the first support roller with the printing substrate adjacent to the oblique printing platform and the first introduction position are arranged on the same side relative to the plane where the oblique printing platform is located, and the angle formed by the cross-section at the contact position and the oblique printing platform is the same as the angle formed by the cross-section at the first introduction position and the oblique printing platform.

5. A short-distance double-sided printing device as claimed in claim 4, characterized in that: The contact position between the second support roller and the printing substrate adjacent to the vertical printing platform is arranged on the same side as the second introduction position relative to the plane where the vertical printing platform is located, and the angle formed by the cross-section at the contact position and the vertical printing platform is the same as the angle formed by the cross-section at the second introduction position and the vertical printing platform.

6. A short-distance double-sided printing device as claimed in claim 5, characterized in that: A first cloth guide roller is arranged between the side of the first support roller away from the oblique printing platform and the first material roller, the first cloth guide roller is provided with a first cloth guide abutment portion arranged to contact the printing substrate, and the upper part of the first support roller is provided with a first support abutment portion arranged to contact the printing substrate.

7. A short-distance double-sided printing device as claimed in claim 6, characterized in that: The center angle of the first cloth guiding roller corresponding to the first cloth guiding abutment portion is A, A≤90°, and the center angle of the first supporting roller corresponding to the first supporting abutment portion is B, B≤90°; A≤B.

8. A short-distance double-sided printing device as claimed in claim 5, characterized in that: A second cloth guide roller is arranged between the second material roller and the side of the second support roller away from the vertical printing platform, the second cloth guide roller is provided with a second cloth guide abutment portion arranged to contact the printing substrate, and the second support roller is provided with a second support abutment portion arranged to contact the printing substrate.

9. A short-distance double-sided printing device as claimed in claim 8, characterized in that: The center angle of the second supporting roller corresponding to the second supporting abutment portion is D, D≤180°, and the center angle of the second cloth guiding roller corresponding to the second cloth guiding abutment portion is C, C≤90°; C≤D; The second cloth guide roller is a cloth clamping roller that can abut against or move away from the second support roller; The steering roller and the second supporting roller are active rollers; The first supporting roller and the first cloth guide roller are aluminum rollers, and the weight of the aluminum rollers used is 1 / 3 of that of steel rollers of corresponding shapes.

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