阅读说明：本技术 一种双面数码喷墨打印装置 (Double-sided digital ink-jet printing device ) 是由 单健 王家远 闫峂 脱占贺 单川 于 2021-07-30 设计创作，主要内容包括：本发明涉及一种双面数码喷墨打印装置,包括打印单元,打印单元包括支撑框架、喷头组、主动辊、支撑辊、测速辊和导向辊；支撑辊包括设置于支撑框架左侧的第一支撑辊、第二支撑辊和第三支撑辊,第一支撑辊的高度低于第三支撑辊的高度,第二支撑辊位于第一支撑辊和第三支撑辊之间、并且位于第一支撑辊和第三支撑辊连线的上方；支撑辊还包括设置于支撑框架右侧的第四支撑辊、第五支撑辊、第六支撑辊,第四支撑辊的高度高于第六支撑辊的高度,第五支撑辊位于第四支撑辊和第六支撑辊之间、并且位于第四支撑辊和第六支撑辊连线的上方。本发明具有可适应打印功能的迭代升级、升级速度快、升级周期短、升级成本低、打印质量高的有益效果。(The invention relates to a double-sided digital ink-jet printing device which comprises a printing unit, wherein the printing unit comprises a supporting frame, a nozzle group, a driving roller, a supporting roller, a speed measuring roller and a guide roller; the supporting rollers comprise a first supporting roller, a second supporting roller and a third supporting roller which are arranged on the left side of the supporting frame, the height of the first supporting roller is lower than that of the third supporting roller, and the second supporting roller is positioned between the first supporting roller and the third supporting roller and is positioned above a connecting line of the first supporting roller and the third supporting roller; the supporting rollers further comprise a fourth supporting roller, a fifth supporting roller and a sixth supporting roller which are arranged on the right side of the supporting frame, the height of the fourth supporting roller is higher than that of the sixth supporting roller, and the fifth supporting roller is located between the fourth supporting roller and the sixth supporting roller and is located above a connecting line of the fourth supporting roller and the sixth supporting roller. The invention has the advantages of being suitable for iterative upgrade of printing function, high upgrade speed, short upgrade period, low upgrade cost and high printing quality.)

1. A double-sided digital ink-jet printing device is characterized in that: the printing device comprises a printing unit, wherein the printing unit comprises a supporting frame (6), a nozzle group, a driving roller (4), a supporting roller, a speed measuring roller and a guide roller; the nozzle group is arranged above the printing area and used for jetting ink drops to the surface of a printing medium in the printing area, and the bottom surface of the nozzle group is parallel to the plane of the printing medium in the printing area; the printing area comprises a first printing area and a second printing area; the driving roller (4) is arranged on the supporting frame (6) and is used for driving the printing medium to move; the supporting rollers comprise a first supporting roller (11), a second supporting roller (12) and a third supporting roller (13) which are arranged on the left side of the supporting frame (6) and located in a first printing area, the height of the first supporting roller (11) is lower than that of the third supporting roller (13), and the second supporting roller (12) is located between the first supporting roller (11) and the third supporting roller (13) and located above a connecting line of the first supporting roller (11) and the third supporting roller (13); the supporting rollers further comprise a fourth supporting roller (14), a fifth supporting roller (15) and a sixth supporting roller (16) which are arranged on the right side of the supporting frame (6) and located in a second printing area, the height of the fourth supporting roller (14) is higher than that of the sixth supporting roller (16), and the fifth supporting roller (15) is located between the fourth supporting roller (14) and the sixth supporting roller (16) and located above the connecting line of the fourth supporting roller (14) and the sixth supporting roller (16); the speed measuring roller is arranged on the supporting frame (6) and used for guiding the printing medium and detecting the moving speed of the printing medium; the guide roller is arranged on the supporting frame (6) and used for guiding and conveying the printing medium.

2. A duplex digital ink jet printing apparatus according to claim 1, wherein: the nozzle group comprises a first nozzle group (81) arranged between the first supporting roller (11) and the second supporting roller (12) and a fifth nozzle group (85) arranged between the fourth supporting roller (14) and the fifth supporting roller (15).

3. A duplex digital ink jet printing apparatus according to claim 2, wherein: the spray head group comprises a second spray head group (82) arranged between the first supporting roller (11) and the second supporting roller (12) and in parallel arrangement with the first spray head group (81), and a sixth spray head group (86) arranged between the fourth supporting roller (14) and the fifth supporting roller (15) and in parallel arrangement with the fifth spray head group (85).

4. A duplex digital ink jet printing apparatus according to claim 3, wherein: the first nozzle group (81) and the sixth nozzle group (86) print the same ink, the second nozzle group (82) and the fifth nozzle group (85) print the same ink, and the first nozzle group (81) and the second nozzle group (82) print the same or different inks.

5. A duplex digital ink jet printing apparatus according to claim 3, wherein: the nozzle groups include a third nozzle group (83) and a fourth nozzle group (84) which are arranged between the second supporting roller (12) and the third supporting roller (13) and are arranged in parallel, and a seventh nozzle group (87) and an eighth nozzle group (88) which are arranged between the fifth supporting roller (15) and the sixth supporting roller (16) and are arranged in parallel.

6. A duplex digital ink jet printing apparatus according to claim 5, wherein: the ink printed by the first nozzle group (81) and the ink printed by the eighth nozzle group (88) are the same, the ink printed by the second nozzle group (82) and the ink printed by the seventh nozzle group (87) are the same, the ink printed by the third nozzle group (83) and the ink printed by the sixth nozzle group (86) are the same, the ink printed by the fourth nozzle group (84) and the ink printed by the fifth nozzle group (85) are the same, and the ink printed by the first nozzle group (81), the ink printed by the second nozzle group (82), the ink printed by the third nozzle group (83) and the ink printed by the fourth nozzle group (84) are different.

7. A duplex digital ink jet printing apparatus according to any one of claims 1-6, wherein: the group of nozzles above the first printing area and the group of nozzles above the second printing area respectively print different surfaces of the printing medium.

8. A duplex digital ink jet printing apparatus according to claim 7, wherein: the guide rollers comprise a first guide roller (301), a second guide roller (302), a third guide roller (303), a fourth guide roller (304) and a fifth guide roller (305), and the guide rollers are used for guiding the printing medium from the left side of the first supporting roller (11) to the right side of the third supporting roller (13) from the upper side so as to enable the printing medium to move from the right side to the left side.

9. A duplex digital ink jet printing apparatus according to any one of claims 5-8, wherein: the ink printed by the first nozzle group (81) is the same as that printed by the second nozzle group (82), the ink printed by the third nozzle group (83) is the same as that printed by the fourth nozzle group (84), the ink printed by the fifth nozzle group (85) is the same as that printed by the sixth nozzle group (86), the ink printed by the seventh nozzle group (87) is the same as that printed by the eighth nozzle group (88), and the ink printed by the first nozzle group (81), the second nozzle group (82), the third nozzle group (83) and the fourth nozzle group (84) are different from each other.

10. A duplex digital ink jet printing apparatus according to claim 9, wherein: the nozzle group above the first printing area and the nozzle group above the second printing area print the same surface of a printing medium, the number of the printing units is two, and the printing medium between one printing unit is output, turned over by a turning bar (7) and then conveyed to the other printing unit.

Technical Field

The invention relates to the technical field of ink-jet printing equipment, in particular to a double-sided digital ink-jet printing device.

Background

The digital printer can realize the printing on demand at regular time and quantity under the control of a computer and other equipment, meet the requirement of personalized printing and realize zero stock, has incomparable advantages of the traditional printing, and is increasingly widely applied to the printing field. In recent years, digital printers capable of duplex printing are increasingly used in the book printing and magazine printing industries.

For a high-yield and high-efficiency double-sided digital ink-jet printer, the volume is very large, the production period of the large-sized digital printer is very long, the time from part acquisition to finished product manufacturing needs several months, the price is high, the transportation cost is high, and the return on investment period for a printer user to purchase the printer needs three to five years. With the development of printing technology, the technology updating speed of the digital printer is faster and faster, and with the scale expansion of users, the service range is expanded continuously, and the functions of the printer need to be updated continuously, so the elimination rate of printing equipment is increased continuously, and a plurality of users of the printer can not adapt to the updating speed of the machine; firstly, changing machines requires a significant capital cost, secondly, large printers are not easily transported out of the factory and the subsequent disposal of waste products is very cumbersome. At present, printer users often require printer manufacturers to upgrade and modify the existing machines in order to save cost, but because subsequent upgrading problems are not considered when many printer manufacturers design printers, parts which are adapted to upgrade need to be redesigned, purchased and assembled, then the parts enter the factory buildings of the users to be modified and debugged on site, and the upgrading period is often as long as two months or three months, so that great loss is caused to the services of the users. There is therefore a need for a digital printer that can be updated and iterated quickly.

The existing double-sided digital ink-jet printer is often provided with an air suction platform in a printing area for adsorbing a printing medium to keep the printing medium flat, but the mode of the air suction platform has the following defects: the air suction platform with high flatness has higher cost; when the air suction platform is installed, the technical difficulty of leveling is high; the contact area between the air suction platform and the printing medium is large, and when the printing medium runs at high speed, static electricity can be generated to adsorb ink drops, so that the drop points of the ink drops are inaccurate, and the printing quality is influenced; when the surface of the printing medium is provided with the special coating, the friction between the printing medium and the air suction platform can damage the coating on the surface of the printing medium due to the large contact area; when double-sided printing is performed, the printed medium surface and the air suction platform rub at high speed to damage the printed patterns to a certain extent.

In summary, the prior art double-sided digital inkjet printer has the following problems:

1) the existing printer cannot meet the upgrading requirement of printing equipment, and has high upgrading cost and low speed;

2) the air suction platform is arranged in the printing area to support and adsorb the printing medium to keep the printing medium flat, but the air suction platform has the problems of high cost, difficult leveling, inaccurate drop point of ink droplets caused by static electricity generation, damage to the coating on the surface of the printing medium and damage to the patterns on the surface of the printed medium.

Disclosure of Invention

The invention aims to provide a double-sided digital ink-jet printing device to solve the defects in the prior art, and the technical problem to be solved by the invention is realized by the following technical scheme.

A double-sided digital ink-jet printing device comprises a printing unit, wherein the printing unit comprises a supporting frame, a nozzle group, a driving roller, a supporting roller, a speed measuring roller and a guide roller; the nozzle group is arranged above the printing area and used for jetting ink drops to the surface of a printing medium in the printing area, and the bottom surface of the nozzle group is parallel to the plane of the printing medium in the printing area; the printing area comprises a first printing area and a second printing area; the driving roller is arranged on the supporting frame and used for driving the printing medium to move; the supporting rollers comprise a first supporting roller, a second supporting roller and a third supporting roller which are arranged on the left side of the supporting frame and located in a first printing area, the height of the first supporting roller is lower than that of the third supporting roller, and the second supporting roller is located between the first supporting roller and the third supporting roller and located above a connecting line of the first supporting roller and the third supporting roller; the supporting rollers further comprise a fourth supporting roller, a fifth supporting roller and a sixth supporting roller which are arranged on the right side of the supporting frame and located in a second printing area, the height of the fourth supporting roller is higher than that of the sixth supporting roller, and the fifth supporting roller is located between the fourth supporting roller and the sixth supporting roller and located above a connecting line of the fourth supporting roller and the sixth supporting roller; the speed measuring roller is arranged on the supporting frame and used for guiding the printing medium and detecting the moving speed of the printing medium; the guide roller is mounted on the support frame and used for guiding and conveying the printing medium.

Preferably, the nozzle group comprises a first nozzle group arranged between the first supporting roller and the second supporting roller and a fifth nozzle group arranged between the fourth supporting roller and the fifth supporting roller.

Preferably, the nozzle group includes a second nozzle group disposed between the first support roller and the second support roller and arranged in parallel with the first nozzle group, and a sixth nozzle group disposed between the fourth support roller and the fifth support roller and arranged in parallel with the fifth nozzle group.

Preferably, the first head group and the sixth head group print the same ink, the second head group and the fifth head group print the same ink, and the first head group and the second head group print the same or different inks.

Preferably, the nozzle groups include a third nozzle group and a fourth nozzle group which are disposed between the second support roller and the third support roller and arranged in parallel, and a seventh nozzle group and an eighth nozzle group which are disposed between the fifth support roller and the sixth support roller and arranged in parallel.

Preferably, the first nozzle group and the eighth nozzle group print the same ink, the second nozzle group and the seventh nozzle group print the same ink, the third nozzle group and the sixth nozzle group print the same ink, the fourth nozzle group and the fifth nozzle group print the same ink, and the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group print different inks.

Preferably, the group of nozzles located above the first printing area and the group of nozzles located above the second printing area print different surfaces of the print medium, respectively.

Preferably, the guide rollers include a first guide roller, a second guide roller, a third guide roller, a fourth guide roller, and a fifth guide roller, and the guide rollers are configured to guide the printing medium from the left side of the first support roller from above to the right side of the third support roller so that the printing medium moves from right to left.

Preferably, the first nozzle group and the second nozzle group print the same ink, the third nozzle group and the fourth nozzle group print the same ink, the fifth nozzle group and the sixth nozzle group print the same ink, the seventh nozzle group and the eighth nozzle group print the same ink, and the first nozzle group, the second nozzle group, the third nozzle group and the fourth nozzle group print different inks.

Preferably, the nozzle group above the first printing area and the nozzle group above the second printing area print the same surface of the printing medium, the number of the printing units is two, and the printing medium between one printing unit is output, turned over by the turning bar and then conveyed to the other printing unit.

The invention has the following beneficial effects:

1) a supporting roller is adopted to replace an air suction platform in the printing area, so that the cost is lower; the adjustment of the flatness is converted into the adjustment of the parallelism, so that the adjustment is easier; the contact area between the supporting roller and the printing medium is reduced, and the roller rotates along with the movement of the printing medium, so that the relative motion between the roller and the printing medium is reduced, and the condition of damaging a coating or a pattern on the surface of the printing medium caused by friction is avoided; static electricity is not easy to generate, and the printing effect is better; the distance between the rollers is shorter, so that the shaking of the printing medium in the moving process can be reduced, and the printing quality is improved;

2) the four printing areas are arranged in the printing unit, the spray head groups with different numbers are arranged above each printing area, the types of ink printed by the spray head groups are changed, and the different roller winding modes of the printing medium are matched, so that the iterative upgrade of the printing function can be quickly realized on the basis of not damaging the original structure of the printer, the upgrade period is shortened, and the upgrade cost is saved.

In conclusion, the double-sided digital ink-jet printing device provided by the invention has the beneficial effects of being adaptable to iterative upgrade of printing functions, high in upgrade speed, short in upgrade period, low in upgrade cost and high in printing quality.

Drawings

FIG. 1 is a schematic structural diagram of one embodiment of the present invention;

FIG. 2 is a schematic structural diagram of another embodiment of the present invention;

FIG. 3 is a schematic view of the structure of the nozzle group according to the present invention;

FIG. 4 is a schematic perspective view of the present invention;

the reference numbers in the drawings are, in order: 11. a first support roll, 12, a second support roll, 13, a third support roll, 14, a fourth support roll, 15, a fifth support roll, 16, a sixth support roll, 21, a first speed measuring roll, 22, a second speed measuring roll, 301, a first guide roll, 302, a second guide roll, 303, a third guide roll, 304, a fourth guide roll, 305, a fifth guide roll, 306, a sixth guide roll, 307, a seventh guide roll, 308, an eighth guide roll, 309, a ninth guide roll, 310, a tenth guide roll, 311, an eleventh guide roll, 312, a twelfth guide roll, 313, a third guide roll, 314, a fourteenth guide roll, 315, a fifteenth guide roll, 316, a sixteenth guide roll, 317, a seventeenth guide roll, 4, a drive roll, 51, a first transport roll, 52, a second transport roll, 53, a third roll, 6, a support frame, 7, a turnover bar, 81, a first nozzle group, 82. a second nozzle group, 83, a third nozzle group, 84, a fourth nozzle group, 85, a fifth nozzle group, 86, a sixth nozzle group, 87, a seventh nozzle group, 88, and an eighth nozzle group.

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1 to 4, a double-sided digital inkjet printing apparatus is improved in that: the printing device comprises a printing unit, wherein the printing unit comprises a supporting frame 6, a nozzle group, a driving roller 4, a supporting roller, a speed measuring roller and a guide roller; the nozzle group is arranged above the printing area and used for jetting ink drops to the surface of a printing medium in the printing area, and the bottom surface of the nozzle group is parallel to the plane of the printing medium in the printing area; the printing area comprises a first printing area and a second printing area; the driving roller 4 is arranged on the supporting frame 6 and is used for driving the printing medium to move; the supporting rollers comprise a first supporting roller 11, a second supporting roller 12 and a third supporting roller 13 which are arranged at the left side of the supporting frame 6 and located in a first printing area, the height of the first supporting roller 11 is lower than that of the third supporting roller 13, and the second supporting roller 12 is located between the first supporting roller 11 and the third supporting roller 13 and located above the connecting line of the first supporting roller 11 and the third supporting roller 13; the supporting rollers further comprise a fourth supporting roller 14, a fifth supporting roller 15 and a sixth supporting roller 16 which are arranged at the right side of the supporting frame 6 and located in the second printing area, the height of the fourth supporting roller 14 is higher than that of the sixth supporting roller 16, and the fifth supporting roller 15 is located between the fourth supporting roller 14 and the sixth supporting roller 16 and located above the connecting line of the fourth supporting roller 14 and the sixth supporting roller 16; the speed measuring roller is arranged on the supporting frame 6 and used for guiding the printing medium and detecting the moving speed of the printing medium; the guide roller is mounted on the support frame 6 for guiding and conveying the printing medium.

Through setting up two printing areas at the printing unit, the printing medium in the printing area carries out bearing and conveying through the backing roll, for the mode that carries out the bearing of printing medium in the printing area through the platform that induced drafts among the prior art, has following beneficial effect: the cost is lower; the adjustment of the flatness is converted into the adjustment of the parallelism, so that the adjustment is easier; the contact area between the supporting roller and the printing medium is reduced, and the roller rotates along with the movement of the printing medium, so that the relative motion between the roller and the printing medium is reduced, and the condition of damaging a coating or a pattern on the surface of the printing medium caused by friction is avoided; static electricity is not easy to generate, and the printing effect is better;

the first printing area is divided into two printing areas by the second supporting roller 12, namely a first left printing area and a first right printing area respectively, and similarly, the second printing area is divided into a second left printing area and a second right printing area by the fifth supporting roller 15;

further, the tachometer roller comprises a first tachometer roller 21 and a second tachometer roller 22, the first tachometer roller 21 is arranged at the lower left of the first support roller 11, and at least one end of the first tachometer roller is provided with an encoder for detecting the moving speed of the printing medium close to the first printing area; the second tachometer roller 22 is disposed at the lower right of the sixth supporting roller 16 and at least one end thereof is provided with an encoder for detecting the moving speed of the printing medium near the second printing area.

Further, the guide rollers include a first guide roller 301, a second guide roller 302, a third guide roller 303, a fourth guide roller 304, and a fifth guide roller 305 for guiding the printing medium from the left side of the first support roller 11 from the upper side to the right side of the third support roller 13 so that the printing medium moves from the right side to the left side.

Further, the guide rollers include a sixth guide roller 306, a seventh guide roller 307, an eighth guide roller 308, a ninth guide roller 309, a tenth guide roller 310, an eleventh guide roller 311, a twelfth guide roller 312, a thirteenth guide roller 313, a fourteenth guide roller 314, a fifteenth guide roller 315, a sixteenth guide roller 316, and a seventeenth guide roller 317.

Further, a first conveying roller 51 and a second conveying roller 52 are provided on the left side of the first guide roller 11 for conveying the printing medium conveyed from the previous job area to the printing unit.

Further, a third conveying roller 53 is disposed at the right side of the driving roller 4, and is used for conveying the printing medium after printing from the printing unit to the next working area.

Further, the second support roller 12 is located on a central axis of a connecting line between the first support roller 11 and the third support roller 13.

Further, the fifth support roller 15 is located on a central axis of a connecting line between the fourth support roller 14 and the sixth support roller 16.

Further, the third supporting roller 13 and the fourth supporting roller 14 have the same height, the second supporting roller 12 and the fifth supporting roller 15 have the same height, and the first supporting roller 11 and the sixth supporting roller 16 have the same height.

Furthermore, the nozzle groups are formed by longitudinally and alternately splicing a plurality of nozzles, so that the width of the printing breadth is increased, namely the width of the printing breadth is the total length covered by the spray holes of the spliced nozzles, and the printing resolution ratio which can be realized by splicing the nozzles in each nozzle group is the same as the printing resolution ratio which can be realized by the nozzle itself.

Through the arrangement of the four printing areas, the arrangement of the spray head groups with different numbers above each printing area, the transformation of the ink types printed by the spray head groups and the matching of different roller winding modes of the printing medium, the iterative upgrade of the printing function can be quickly realized on the basis of not damaging the original structure of the printer.

The following two methods of winding the printing medium around the roller are taken as examples to describe specific implementation modes of the iterative upgrade of the printing function:

first, a winding method I of a printing medium:

the winding roller method is as shown in fig. 1, the printing medium is conveyed to the printing unit by a first conveying roller 51 and a second conveying roller 52, and the printing medium printed by the printing unit is conveyed to the next working area by a third conveying roller 53; in a winding mode in fig. 1, the printing medium is turned over at the seventh guide roller 307 and enters the second printing area through the eighth guide roller 308, the ninth guide roller 309 and the tenth guide roller 310, so that the groups of nozzles located in the first printing area and the second printing area respectively print different sides of the printing medium, and then the duplex printing can be completed; the distance between the rollers is set to be shorter, so that the jitter of the printing medium in the moving process can be reduced, and the printing quality is improved. The print medium is therefore wound upwards, on the one hand in order to make the print medium enter the first print zone from the right, and on the other hand in order to avoid the printing carriage arranged above the print zone, to avoid interference. Furthermore, connecting lines among the first speed measuring roller 21, the sixth guide roller 306 and the seventh guide roller 307 are in a V shape, and connecting lines among the twelfth guide roller 312, the eleventh guide roller 311 and the second speed measuring roller 22 are in a V shape; further, drying devices are respectively arranged between the first speed measuring roller 21 and the sixth guide roller 306, between the sixth guide roller 306 and the seventh guide roller 307, between the twelfth guide roller 312 and the eleventh guide roller 311, and between the eleventh guide roller 311 and the second speed measuring roller 22, and are used for drying the printed printing medium, and the V-shaped rollers are arranged, so that the number of the drying devices which can be arranged in the space is the largest, the drying area is the largest, and the drying effect is better; the structural arrangement of each roller ensures that the surface of the printing medium after printing is not directly contacted with the roller, but is contacted with the surface of the roller after drying, thereby avoiding the damage of the printed pattern and the influence on the printing quality.

Under the roller winding mode, the iterative upgrade of the printing functions of double-sided monochrome, double-sided monochrome double-speed, double-sided double-color and double-sided color can be respectively realized through different setting modes of the spray head groups above the printing area, the original machine structure does not need to be damaged, and the upgrade speed is high.

The following examples are provided to illustrate specific implementations of the above-described print function:

example 1:

referring to fig. 3, the nozzle group includes a first nozzle group 81 disposed between the first supporting roller 11 and the second supporting roller 12, and further includes a fifth nozzle group 85 disposed between the fourth supporting roller 14 and the fifth supporting roller 15.

Further, the first head group 81 and the fifth head group 85 print the same ink.

In this embodiment, the first head group 81 is disposed above the first left printing area, the fifth head group 85 is disposed above the second left printing area, and the ink printed by the first head group 81 and the fifth head group 85 is the same, i.e., the printing function of double-sided monochrome can be realized.

Example 2:

in example 1, the head groups include a second head group 82 disposed between the first support roller 11 and the second support roller 12 and arranged in parallel with the first head group 81, and a sixth head group 86 disposed between the fourth support roller 14 and the fifth support roller 15 and arranged in parallel with the fifth head group 85.

Further, the first head group 81 and the sixth head group 86 print the same ink, the second head group 82 and the fifth head group 85 print the same ink, and the first head group 81 and the second head group 82 print the same or different inks.

In this embodiment, the first head group 81 and the second head group 82 are arranged in parallel above the first left printing area, which is equivalent to increase the printing speed by one time, and similarly, the fifth head group 85 and the sixth head group 86 are arranged in parallel above the second left printing area, which is equivalent to increase the reverse printing speed by one time.

When the ink printed by the first nozzle group 81 and the ink printed by the second nozzle group 82 are the same, namely the ink printed by the four nozzle groups is the same, the printing function of double-sided monochrome and double-speed printing can be realized;

when the ink printed by the first nozzle group 81 and the ink printed by the second nozzle group 82 are different, the printing of two colors is realized on the front surface and the back surface, namely, the double-sided two-color printing function can be realized, and when the front surface and the back surface are printed, the direction of the printing medium entering the first printing area is from right to left, and the direction of the printing medium entering the second printing area is from left to right, so the arrangement sequence of the inks needs to be symmetrically arranged, and the color difference caused by the different ink drop covering sequences is avoided during the double-sided printing;

in summary, the printer provided by this embodiment can realize the printing function of double-sided monochrome and double-sided two-color.

Example 3:

in example 1, the head groups include a second head group 82 disposed between the first support roller 11 and the second support roller 12 and arranged in parallel with the first head group 81, and a sixth head group 86 disposed between the fourth support roller 14 and the fifth support roller 15 and arranged in parallel with the fifth head group 85.

Further, the nozzle groups include a third nozzle group 83 and a fourth nozzle group 84 disposed between the second supporting roller 12 and the third supporting roller 13 and arranged in parallel, and a seventh nozzle group 87 and an eighth nozzle group 88 disposed between the fifth supporting roller 15 and the sixth supporting roller 16 and arranged in parallel.

Further, the first head group 81 and the eighth head group 88 print the same ink, the second head group 82 prints the same ink as the seventh head group 87, the third head group 83 prints the same ink as the sixth head group 86, the fourth head group 84 prints the same ink as the fifth head group 85, and the first head group 81, the second head group 82, the third head group 83, and the fourth head group 84 print different inks.

In this embodiment, two groups of nozzle groups are arranged in parallel above the first left printing area, the first right printing area, the second left printing area and the second right printing area, and the first printing area and the second printing area can both realize printing of four colors, that is, can realize a double-sided color printing function; and when the front side and the back side are printed, the direction of the printing medium entering the first printing area is from right to left, and the direction of the printing medium entering the second printing area is from left to right, so that the arrangement sequence of the ink needs to be symmetrically arranged, and the color difference caused by different ink drop covering sequences during double-side printing is avoided.

Second, a winding roller mode II of the printing medium:

the winding roller mode is as shown in fig. 2, the printing medium is conveyed to the printing unit by the first conveying roller 51 and the second conveying roller 52, and the printing medium printed by the printing unit is conveyed to the next working area by the third conveying roller 53, the first printing area and the second printing area print the same surface of the printing medium, and a large arc surface is formed between the two printing areas, which does not affect the tension of the printing medium in the running process, and avoids the printing quality affected by the contact of the surface of the printing medium with the surface of the roller. The distance between the rollers is set to be shorter, so that the jitter of the printing medium in the moving process can be reduced, and the printing quality is improved. Furthermore, connecting lines among the seventeenth guide roller 317, the sixth guide roller 306 and the seventh guide roller 307 are in a V shape, and connecting lines among the twelfth guide roller 312, the eleventh guide roller 311 and the second speed measuring roller 22 are in a V shape; further, drying devices are respectively arranged between the seventeenth guide roller 317 and the sixth guide roller 306, between the sixth guide roller 306 and the seventh guide roller 307, between the twelfth guide roller 312 and the eleventh guide roller 311, and between the eleventh guide roller 311 and the second speed measuring roller 22, and are used for drying the printed printing medium, and the V-shaped rollers are arranged, so that the number of the drying devices which can be arranged in the space is the largest, the drying area is the largest, and the drying effect is better; the structural arrangement of each roller ensures that the surface of the printing medium after printing is not directly contacted with the roller, but is contacted with the surface of the roller after drying, thereby avoiding the damage of the printed pattern and the influence on the printing quality.

Further, a heating lamp is arranged above the printing medium between the third supporting roller 13 and the fourth supporting roller 14, the irradiation surface of the heating lamp faces the upper surface of the printing medium, so that the printed ink drops are dried quickly, and cooling devices are arranged around the heating lamp, so that the surface of the printing medium can be heated, and the heat generated by the heating lamp can be prevented from being dissipated to the printing environment to cause the rise of the ambient temperature and the rise of the ink temperature.

In the roll-around system, the printer can realize a high-precision printing function of double-sided color, and the following embodiment will explain the printer in detail.

Example 4:

as shown in fig. 3, the nozzle groups include a second nozzle group 82 disposed between the first support roller 11 and the second support roller 12 and arranged in parallel with the first nozzle group 81, and a sixth nozzle group 86 disposed between the fourth support roller 14 and the fifth support roller 15 and arranged in parallel with the fifth nozzle group 85.

Further, the nozzle groups include a third nozzle group 83 and a fourth nozzle group 84 disposed between the second supporting roller 12 and the third supporting roller 13 and arranged in parallel, and a seventh nozzle group 87 and an eighth nozzle group 88 disposed between the fifth supporting roller 15 and the sixth supporting roller 16 and arranged in parallel.

Further, the first head group 81 and the second head group 82 print the same ink, the third head group 83 and the fourth head group 84 print the same ink, the fifth head group 85 prints the same ink as the sixth head group 86, the seventh head group 87 prints the same ink as the eighth head group 88, and the first head group 81, the second head group 82, the third head group 83, and the fourth head group 84 print different inks.

Furthermore, the nozzle group above the first printing area and the nozzle group above the second printing area print the same surface of the printing medium, the number of the printing units is two, and the printing medium between one printing unit is output, turned over by the turning bar 7 and then conveyed to the other printing unit. In this embodiment, two groups of nozzle groups are arranged in parallel above the first left printing area, the first right printing area, the second left printing area and the second right printing area; in the four printing areas, the two nozzle groups in the same printing area print the same ink, and the two nozzle groups in the same printing area can realize higher resolution due to mutual splicing, for example, the printing resolution which can be realized after the nozzles in one nozzle group are spliced is 600dpi, and the resolution of 1200dpi can be realized through the splicing of the two nozzle groups; the ink that the shower nozzle group in the different printing regions was printed is different, can be in order to accomplish four kinds of colours and be colored printing function, through setting up two printing unit to carry out the turn-over through upset thick stick 7 between two printing unit with the medium of undertaking the printing, can realize two-sided printing, the ink mode of arranging in embodiment 2 and 3 is distinguished from, because of the direction that the printing medium of two printing unit gets into the printing region is left to right, consequently need not to organize the ink symmetry that prints with the shower nozzle group and arrange.

In conclusion, the present embodiment can realize a printing function of double-sided color with high precision.

It should be noted that the above detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise. Furthermore, it will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or otherwise described herein.

Furthermore, the terms "comprising" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements explicitly listed, but may include other steps or elements not explicitly listed or inherent to such process, method, article, or apparatus.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented in other different ways, such as by rotating it 90 degrees or at other orientations, and the spatially relative descriptors used herein interpreted accordingly.

In the foregoing detailed description, reference is made to the accompanying drawings, which form a part hereof. In the drawings, like numerals typically identify like components, unless context dictates otherwise. The illustrated embodiments described in the detailed description, drawings, and claims are not meant to be limiting. Other embodiments may be utilized, and other changes may be made, without departing from the spirit or scope of the subject matter presented here.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.