CN113524926A - Single-sheet double-side code spraying machine - Google Patents

Abstract

The invention provides a single-sheet double-sided code spraying machine, which comprises a water-based ink jet system arranged above a printing cylinder and a paper collecting part at one side, wherein the other side of the printing cylinder is respectively provided with a paper conveying part for conveying paper, a turning part for turning the paper and a phase adjusting mechanism for adjusting the phase of the paper, the paper conveying part and the turning part are respectively positioned at the upper end and the lower end of the phase adjusting mechanism, a single-sided paper holding mechanism and a double-sided paper holding mechanism are installed on the outer wall of the printing cylinder in a staggered manner, one end of the printing cylinder is provided with a single-sided cam and a double-sided cam, and when single-sided printing is required, the single-sided paper holding mechanism and the double-sided paper holding mechanism are matched with the single-sided cam for holding paper; when double-sided printing is needed, the double-sided paper gripping mechanism and the double-sided cam are matched to grip paper to realize double-sided switching of single paper. The single-paper double-sided ink-jet printer adopts a roller mode and is matched with an advanced turnover mechanism to realize double-sided printing, so that the printing precision and the printing quality are ensured, and the cost of equipment is greatly reduced.

Description

Single-sheet double-side code spraying machine

Technical Field

The invention belongs to the technical field of printing machines, and particularly relates to a single-paper double-sided inkjet printer.

Background

At present, the mature product of the single-sheet ink-jet digital printing machine is KM1 of Konika Mingta, double-sided printing is realized by using a set of nozzles, and after the front side of paper is printed, the paper is turned over and returns to a printing roller through a paper path to be printed on the back side. But the paper specification that it can use is single, can't use the paper of other specifications. The working principle of the existing roller ink-jet printer is as follows: the gear transmission is arranged between the rollers, the paper head is held by the grippers on the rollers to drive the paper to rotate, the rollers perform paper handover at the tangent point position of the rollers, the paper is transferred from one roller to another roller, the paper head is always opposite to the paper head in the process, and the paper is guaranteed to be static relative to the rollers. The ink jet system can perform ink jet printing according to pictures only by detecting the running speed of the roller. When the double-sided printing is needed, the paper is transferred to the turnover cylinder part, the paper holding position of the turnover cylinder is not the paper head but the paper tail, the paper is turned over, the normal paper is continuously transferred and handed over below the paper, and the paper is transferred to the printing cylinder again to carry out the reverse-sided printing. Therefore, the paper conveying path is a closed ring, and if the specification of the paper is changed, the paper cannot be accurately conveyed to the paper holding gripper row position of the next roller after the turnover roller grabs the tail of the paper. Therefore, the biggest defect of the current Konika Meineng KM1 is that the paper specification is single, only one specification of paper can be used in double-sided printing, and only the paper with the designed specification can be used. The user can not use paper of other specifications, so that the use flexibility of the user is limited, and the use cost of the user is increased.

Disclosure of Invention

In view of this, the present invention is directed to a single-sheet double-sided inkjet printer, so as to solve the problem that only one specification of paper can be used in a single-sheet digital printer during double-sided printing.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a single-sheet double-sided ink-jet printer comprises a water-based ink-jet system arranged above a printing roller and a paper collecting part arranged on one side of the printing roller, wherein a paper conveying part for conveying paper, a turning part for turning the paper and a phase adjusting mechanism for adjusting the phase of the paper are respectively arranged on the other side of the printing roller, the paper conveying part and the turning part are respectively positioned at the upper end and the lower end of the phase adjusting mechanism, a single-sided paper holding mechanism and a double-sided paper holding mechanism are installed on the outer wall of the printing roller in a staggered mode, a single-sided cam and a double-sided cam are arranged at one end of the printing roller, the double-sided cam is connected to an air cylinder, and the air cylinder is connected to a controller in a signal mode; when single-sided printing is needed, the single-sided paper gripping mechanism and the double-sided paper gripping mechanism are matched with the single-sided cam to grip paper; when double-sided printing is needed, only the double-sided paper gripping mechanism is matched with the double-sided cam to grip paper, and double-sided switching of single paper is achieved.

Furthermore, one side of the printing roller is respectively provided with a single-diameter paper conveying roller and an even-number-times turning roller, the even-number-times paper conveying roller is positioned above a driven paper conveying chain wheel of the phase adjusting mechanism, and a driving paper conveying chain wheel of the phase adjusting mechanism is positioned above the paper conveying roller of the turning part.

Furthermore, a paper tail adsorption device is arranged on the printing roller, an air suction seat used for adsorbing paper is arranged on the paper tail adsorption device, the upper surface of the air suction seat is tangent to the diameter of the roller, and the air suction seat and the roller can move relatively along the circumferential direction of the roller.

Furthermore, the turnover part comprises a breadth adjusting unit and an even-number-times turnover roller, a turnover roller and a paper conveying roller which are sequentially arranged on one side of the breadth adjusting unit in parallel, the breadth adjusting unit is used for adjusting the breadth of paper, a cam adjusting unit used for adjusting a paper head cam is installed on one side of the even-number-times turnover roller, and the breadth adjusting unit and the cam adjusting unit are respectively connected to the controller in a signal mode.

Furthermore, the cam adjusting unit comprises a driving gear and a cam locking structure for limiting the driving gear, wherein a cam adjusting motor and a paper head cam are fixedly connected to two sides of the driving gear respectively, and the cam adjusting motor and the cam locking structure are in signal connection with the controller respectively.

Furthermore, the breadth adjusting unit comprises a breadth adjusting even-number-times adjusting gear, a breadth adjusting gear, a paper conveying adjusting gear, a breadth locking structure and a breadth adjusting motor, the two ends of a bearing of the turnover roller are fixedly sleeved with the breadth adjusting gear and a turnover roller driving gear respectively, the turnover roller driving gear is fixedly connected to the breadth adjusting motor, the breadth locking structure is arranged on the outer side of the breadth adjusting gear, the two sides of the breadth adjusting gear are meshed with the breadth adjusting even-number-times adjusting gear and the paper conveying adjusting gear respectively, a bearing of the paper conveying roller is fixedly sleeved inside the paper conveying adjusting gear, a bearing of the even-number-times turnover roller is fixedly sleeved inside the breadth adjusting even-number-times adjusting gear, and the breadth locking structure and the breadth adjusting motor are respectively connected to the controller in a signal mode.

Furthermore, the phase adjusting mechanism comprises two chain tensioning units which are symmetrically arranged, a guide rail and a driving unit are arranged on the outer side of each chain tensioning unit, the guide rail is arranged on external equipment, so that a tensioning plate of each chain tensioning unit can move left and right along the guide rail under the driving of the adjusting unit, and the driving unit is in signal connection with the controller; the upper end and the lower end of each chain tensioning unit are respectively provided with a driven paper conveying chain wheel and a driving paper conveying chain wheel which form a transmission structure, and a paper gripping tooth row and a guide plate are arranged between the two chain tensioning units.

Compared with the prior art, the single-sheet double-sided code spraying machine has the following advantages:

(1) the single-paper double-sided ink-jet printer adopts a roller mode and is matched with an advanced turnover mechanism to realize double-sided printing, so that the printing precision and the printing quality are ensured, and the cost of equipment is greatly reduced; meanwhile, the use and maintenance cost of a user is reduced.

(2) Compared with a roll paper ink-jet printer, the single-paper double-sided ink-jet printer has the advantages that the flexibility of a user is improved, and the selectable paper specifications and varieties are more.

(3) According to the single-sheet double-sided ink-jet printer, the format adjusting mechanism ensures that the paper specification is not limited, the workload and time for subsequent procedure treatment are reduced, the production efficiency is improved, and the cost is reduced.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram of a single-sheet double-sided inkjet printer according to an embodiment of the present invention;

FIG. 2 is a side view of a sheet-fed duplex ink jet printer according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a single-sheet double-sided inkjet printer according to an embodiment of the present invention;

FIG. 4 is a schematic view of a print cylinder according to an embodiment of the present invention;

FIG. 5 is an enlarged view taken at A in FIG. 4;

FIG. 6 is an enlarged view at B in FIG. 4;

FIG. 7 is a schematic view of a drum according to an embodiment of the present invention;

FIG. 8 is a first schematic diagram of the flip portion according to the embodiment of the present invention;

FIG. 9 is an enlarged view at C of FIG. 8;

FIG. 10 is a second schematic view of the upturned portion of the present invention;

FIG. 11 is a schematic view of a tumbler according to an embodiment of the present invention;

fig. 12 is a schematic view of a web adjustment unit according to an embodiment of the present invention;

fig. 13 is a cross-sectional view of a web adjustment gear according to an embodiment of the present invention;

FIG. 14 is a first schematic view of a phase adjustment mechanism according to an embodiment of the present invention;

fig. 15 is a schematic diagram of a phase adjustment mechanism according to an embodiment of the invention.

Description of reference numerals:

1-a printing cylinder; 11-a roller; 111-gap; 112-gas distribution valve; 113-a suction seat; 1131, a suction hole; 114-an air inlet; 115-a fixed seat; 12-single-sided tooth row; 13-single sided tooth row cam roller; 131-a single cam roller; 14-double sided tooth row cam roller; 141-a first double-sided roller; 142-a second double-sided roller; 15-cylinder; 16-a double-sided cam; 17-a single cam; 18-double-sided tooth row; 19-adjusting the gear. 2-a flip part; 21-even times of turning over the roller; 211-paper tail cam; 212-a tail gripper; 213-tail tensioning bite block; 214-paper tail bite block cam; 215-a paper head gripper; 216-even times adjusting gear; 217-even multiple bearings; 218-a card liner; 219-No. two rolled sheets; 2110-paper head cam; 2111-even number of support plates; 22-a tumbler; 221-a support plate; 222-an end plate; 223-a bearing; 224-inverting the cylinder gripper bar; 2241-a first gear block; 2242-gear block II; 2243-gripper shaft; 2244-dental pad plate; 2245-grippers; 225-tumble drum drive gear; 226-tumble roller cam; 23-a paper transfer roller; 24-a cam adjustment unit; 241-cam adjustment motor; 242-a drive gear; 243-cam locking structure; 2431-cam lock cylinder; 2432-cam lock lever; 2433-briquetting; 25-a format adjustment unit; 251-format adjustment even-number times of adjusting gear; 252-intermediate gear; 2521-first idler gear; 2522-second idler gear; 2523-third idler gear; 2524-fourth idler gear; 253-swath adjustment gear; 2531-interface; 2532-a housing; 2533-first face gear; 2534-second face gear; 2535-plug-in unit; 2536-a stop block; 2537-breadth adjusting attachment; 254-paper transfer adjusting gear; 255-panel latching structure; 2551-panel locking lever; 2552-panel lock cylinder; 256-breadth adjusting idler gear; 257-a swath adjustment motor; 3-a phase adjustment mechanism; 31-a guide plate; 32-a chain tensioning unit; 321-tensioning chain; 322-a tension plate; 3221-a connector; 3222-a spacing hole; 323-driven wheel; 324-a drive wheel; 33-driven paper transfer sprocket; 34-gripper bar; 35-a guide rail; 36-an adjustment unit; 361-adjusting the motor; 362-a driving member; 37-driving paper transfer sprocket; 38-a scaffold; 39-locking limit unit; 391-a spacing rod; 392-a lockout cylinder; 393-a latching lever; 310-a limiting plate; 4-a paper conveying part; 41-even times paper conveying roller; 42-single diameter paper conveying roller; 5-aqueous inkjet systems; 6-a delivery section; 61-delivery cylinder; 62-paper receiving tension wheel; 63-paper receiving pile; 64-dry lamp group; 7-a paper feeding part; 71-a paper feed shaft; 72-pile of paper; 8-paper pressing wheel.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

A single-sheet double-sided ink-jet printer is shown in figures 1 to 15 and comprises a printing roller 1, an overturning part 2, a phase adjusting mechanism 3, a paper conveying part 4, a water-based ink-jet system 5 and a paper collecting part 6, wherein the water-based ink-jet system 5 is arranged above the printing roller 1, one side of the printing roller is respectively provided with the paper conveying part 4 for conveying paper, the overturning part 2 for overturning paper and the phase adjusting mechanism 3 for adjusting the phase of the paper, the paper conveying part 4 and the overturning part 2 are respectively positioned at the upper side and the lower side of the phase adjusting mechanism 3, and the other side of the printing roller 1 is provided with the paper collecting part 6.

The paper transfer section 4 includes an even-numbered multiple paper transfer cylinder 41 and a plurality of single-diameter paper transfer cylinders 42 arranged in parallel with each other, and the paper transfer cylinders are composed of three or more cylinders and are adjusted for confirmation according to the paper path length. The structures of the even-numbered times paper transfer roller 41 and the single-diameter paper transfer roller 42 are the prior art.

As shown in fig. 4 to 7, the printing cylinder 1 includes a cylinder 11, a single-sided sheet holding mechanism, and a double-sided sheet holding mechanism, the single-sided sheet holding mechanism includes a single-sided gripper bar 12 and a single-sided gripper bar cam roller 13 connected to the single-sided gripper bar, the double-sided sheet holding mechanism includes a double-sided gripper bar 18 and a double-sided gripper bar cam roller 14 connected to the double-sided gripper bar, the single-sided gripper bar 12 and the double-sided gripper bar 18 are staggered on the cylinder 11, a single-sided cam 17 and a double-sided cam 16 (which may be arranged in parallel or vertically) are arranged on one side of the cylinder 11, an air cylinder 15 is installed outside the double-sided cam 16, and the air cylinder 15 is in signal connection with a controller; when single-sided printing is needed, the single-sided gripper bar cam roller 13 and the double-sided gripper bar cam roller 14 are matched with the single-sided cam 17 to carry out sheet gripping; when duplex printing is required, only the duplex gripper cam roller 14 cooperates with the duplex cam 164 to change the action of the duplex gripper 18.

In order to effectively control the paper transfer and distinguish single-sided or double-sided, the roller 11 adopts an even-number diameter-multiplying roller at the position where the single-sided and double-sided switching and distinguishing are needed; the single-sided gripper bar 12 on the cylinder 11 is responsible for gripping the paper to be single-sided printed, and the double-sided gripper bar 18 is responsible for gripping the paper to be double-sided printed, and whether the paper is handed over or not is controlled by increasing or decreasing the cam at the handing-over position. The paper tail adsorption device is arranged on the roller 11, the air suction seat 113 used for adsorbing paper is arranged on the paper tail adsorption device, the upper surface of the air suction seat 113 is tangent to the diameter of the roller 11, and the air suction seat and the roller 11 can move relatively in the circumferential direction of the roller 11. Preferably, the air suction seat 113 is provided with a plurality of air suction holes 1131, the upper surface of the air suction seat 113 is tangential to the diameter of the roller 11, and the paper is sucked on the surface of the roller 11 through the air suction holes 1131.

The paper tail adsorption device further comprises an adjusting gear 19 and an air distribution valve 112, the roller 11 and the adjusting gear 9 are coaxially arranged, a plurality of air suction seats 113 are arranged between the adjusting gear 9 and the base of the roller 11, each air suction seat 113 is fixedly connected to the adjusting gear 19, a plurality of gap groups are arranged on the outer wall of the roller 11, a plurality of gaps 111 are axially and uniformly distributed in each gap group, one air suction seat 113 is arranged in each gap 111, and the air suction seats 113 can move in a reciprocating mode in the circumferential direction of the outer wall of the roller 11 in the gaps 111 under the driving of external force; the adjusting gear 19 is connected with the paper presetting mechanism, and the paper presetting mechanism automatically drives the adjusting gear 19 to rotate to a certain position according to the set size of the paper, so that the air suction holes 1131 of the air suction seat 113 are always aligned with the tail of the paper, and the tail is firmly adsorbed; an air distribution valve 112 is arranged in the roller 11, and the air distribution valve 112 connects an air suction seat 113 with an air inlet 114 through an air pipe and then is connected with an air source to reasonably divide the air suction into a plurality of parts. The suction force of the suction holes 1131 to the paper is kept uniform, the stability of the paper is guaranteed, meanwhile, the requirement of the structure on negative pressure is reduced, and an energy-saving effect can be achieved to a certain extent. In one embodiment, a plurality of fixing seats 115 parallel to each other are disposed between the adjusting gear 19 and the base, the fixing seats 115 are all fixedly connected with the adjusting gear 19 and do not contact with the base, and a plurality of suction seats 113 are uniformly distributed above each fixing seat 115. The fixed seat 115 connects the air suction seat 113 and the adjusting gear 19 together to play a role in connection and fixation.

The working principle of the printing roller paper tail air suction device is as follows: install the printing cylinder paper tail device of induced drafting of this scheme between two supporting mechanism, air inlet 114 and air supply tube coupling, adjusting gear 19 links to each other with outside paper preset mechanism, the user sets up the paper specification in advance through paper preset mechanism before the start, paper preset mechanism drives adjusting gear 19 and rotates to suitable position, adjusting gear 19 rotates thereby and drives fixing base 115 motion, and then drive air suction seat 113 motion, because cylinder 11 is motionless, consequently air suction seat 113 removes along the external diameter direction of cylinder 11 for clearance 111, when paper preset mechanism control adjusting gear 19 stopped moving, the relative position of air suction seat 113 and clearance 111 is static, guarantee that the paper tail of this batch of paper can be inhaled to the position of suction hole 1131.

The outer side of the adjusting gear 19 is sequentially provided with a single-sided cam 17 and a double-sided cam 16, the edge of the adjusting gear 19 is provided with a plurality of arc-shaped grooves, and the arc-shaped grooves are used for installing the single-sided tooth row cam rollers 13 and the double-sided tooth row cam rollers 14. In one embodiment, a limiting groove is arranged on one side of the single-sided cam 17 close to the double-sided cam 16 to limit the position of the double-sided cam 16; the thickness of spacing groove is the same with the thickness of two-sided cam 16, and cylinder 15 installs on external equipment, and when two-sided cam 16 was pressed into the spacing groove under the drive of cylinder 15, the outside of two-sided cam 16 flushed with the outside of single face cam 17 for each part of equipment is direct compacter, thereby practices thrift equipment space. The control of the action of the gripper bar is controlled by a cam, the cam high-point gripper bar is closed, and the cam low-point gripper bar is opened. Specifically, the outer wall of the cylinder 11 is further provided with a plurality of gripper bar placement positions, the gripper bar placement positions are used for installing a single-sided gripper bar 12 and a double-sided gripper bar 18, a gripper shaft of each group of gripper bars passes through an arc-shaped groove and then is connected to a cam roller, (the gripper shaft of the double-sided gripper bar 18 passes through an arc-shaped groove and then is connected to a double-sided gripper bar cam roller 14, the gripper shaft of the single-sided gripper bar 12 passes through an arc-shaped groove and then is connected to a single-sided gripper bar cam roller 13), the matching relationship between the cam and the gripper bar and the working principle are the prior art, and the detailed description is omitted, and reference may be made to "a method for manufacturing a gripper opening and closing device of a printing machine" or "a structure and adjustment of a gripper.

Only one single-sided cam roller 131 is arranged on the single-sided tooth row cam roller 13 and is only acted by the single-sided cam 17, and two cam rollers are arranged on the double-sided tooth row cam roller 14 side by side and are respectively a first double-sided roller 141 and a second double-sided roller 142, so that the double-sided tooth row cam roller 14 can be acted by the single-sided cam 17 or the double-sided cam 16.

The working principle of single-sided and double-sided switching of the printing roller is as follows: in an initial state, the single-sided cam 17, the double-sided cam 16 and the cylinder 15 are all fixedly arranged on an external supporting mechanism, the roller 11 is movably connected with the external supporting mechanism through a bearing, and the single-sided tooth row 1 and the double-sided tooth row 18 can be matched with the single-sided cam 17 when the roller 11 rotates; the cylinder 15 is connected to an external air source, and the double-sided cam 16 is separated from the in-plane cam 7 and does not prevent the roller 11 from driving the single-sided tooth row 1 and the double-sided tooth row 18 to move. When single-side printing is needed, the paper moving paths on the roller are the same, the single-side gripper bar 1 and the double-side gripper bar 18 act the same and are normally opened and closed under the action of the single-side cam 17, the single-side gripper bar 1 and the double-side gripper bar 18 are driven to rotate by the roller 11, the single-side gripper bar 1 and the first double-side roller 141 are in contact fit with the single-side cam 17, when the single-side gripper bar cam roller 13 rotates to the high point of the single-side cam 17, the single-side gripper bar cam roller 13 drives the single-side gripper bar 1 to be closed through the gripper shaft, and when the single-side gripper bar cam roller 13 rotates to the low point of the single-side cam 17, the single-side gripper bar cam roller 13 drives the single-side gripper bar 1 to be opened through the gripper shaft, and similarly, the first double-side roller 141 controls the opening and closing of the double-side gripper bar 18, so that paper is gripped and released; when the double-sided printing is required, the operator controls the movement of the air cylinder 15 through the controller, and since the air cylinder 15 is installed on the external support mechanism, therefore, when the cylinder 15 moves, the double-sided cam 16 is pushed out, so that the position of the double-sided cam 16 is matched with the second double-sided roller 142, specifically, as the cylinder 11 drives the single-sided tooth row 1 and the double-sided tooth row 18 to rotate, the single-sided tooth row 1 does not contact with the double-sided cam 16, the second double-sided roller 142 contacts with the double-sided cam 16, when the second double-sided roller 142 rotates to the high point of the double-sided cam 16, the second double-sided roller 142 drives the double-sided tooth row 18 to close through the gripper shaft, and when the second double-sided roller 142 rotates to the low point of the double-sided cam 16, the second double-sided roller 142 drives the double-sided tooth row 18 to open through the gripper shaft, thereby changing the action of the double-sided teeth row 18 and not delivering the sheet to the delivery section, but continuing to rotate and delivering it to the reverse cylinder section.

As shown in fig. 8 to 13, the reversing section 2 includes a web adjusting unit 25, and an even-numbered times reversing cylinder 21, a reversing cylinder 22, and a paper transfer cylinder 23, which are installed in parallel on one side thereof, respectively, the web adjusting unit 25 is used to adjust the web of the paper, and a cam adjusting unit 24 for adjusting the paper head cam 2110 is installed on one side of the even-numbered times reversing cylinder 21.

The even-number times turnover drum 21 comprises a tail cam 211, a tail gripper 212, a tail tensioning tooth pad 213, a tail pad cam 214, a paper head gripper 215, an even-number times adjusting gear 216, an even-number times bearing 217, a first paper rolling plate 218, a second paper rolling plate 219 and a paper head cam 2110, wherein the even-number times adjusting gear 216 and an even-number times supporting plate 22111 are sleeved outside the even-number times bearing 217, a plurality of first paper rolling plates 218 and second paper rolling plates 219 are arranged between the even-number times adjusting gear 216 and the even-number times supporting plate 22111 in a staggered mode, each first paper rolling plate 218 is fixedly connected to a tail gripper unit used for gripping a tail, and each second paper rolling plate 219 is fixedly connected to a paper head gripper unit used for gripping a paper head.

Preferably, the tail gripper unit comprises a tail cam 211, a tail gripper 212, a tail tensioning gripper pad 213 and a tail gripper pad cam 214, the outer side of an even multiple adjusting gear 216 is sequentially provided with the tail gripper pad cam 214 and the tail cam 211, a tail tensioning gripper pad 213 and a tail gripper shaft are arranged between the even multiple adjusting gear 216 and an even multiple supporting plate 22111, a plurality of tail grippers 212 are uniformly distributed on the tail gripper shaft, the positions of the tail grippers 212 are matched with the positions of the tail tensioning gripper pad 213, so that the tail grippers 212 can be matched with the tail tensioning gripper pad 213 under the driving of external force to complete the gripping and releasing of the paper, and the tail tensioning gripper pad 213 is fixedly connected with each one paper rolling plate 218; the roller arranged outside the paper tail gripping shaft is matched with the paper tail cam 211 to complete the control of the opening and closing of the paper tail gripping teeth 212, the roller arranged outside the paper tail tensioning tooth pad 213 is matched with the paper tail tooth pad cam 214 to complete the tensioning control of the paper tail tensioning tooth pad 213, the matching relation of the cam and the opening and closing of the gripping tooth row and the working principle are the prior art, and the details are not repeated herein, and reference can be made to the document "manufacturing method of the gripper opening and closing device of the printing machine" or "structure and adjustment of the gripping teeth of the offset printing machine". The structures of the paper head gripping unit and the paper tail gripping unit are completely the same, and the detailed description is omitted. For convenience of description of the operation principle, the head gripper unit is only denoted by the head gripper 215 and the head cam 2110 in the drawing. The even-number-times turnover cylinder 21 is a gripper tail turnover mechanism, and the even-number-times turnover cylinder 21 mainly plays a role in transferring paper, grabbing a paper head and a paper tail in the transferring process and leveling the paper.

The cam adjusting unit 24 includes a cam adjusting motor 241, a driving gear 242, and a cam locking structure 243, the cam adjusting motor 241 is fixedly connected to the driving gear 242, the driving gear 242 is coaxially disposed with the even-numbered double turnover roller 21, the driving gear 242 is fixedly connected to the paper head cam 2110 so as to drive the paper head cam 2110 to rotate, the cam locking structure 243 is mounted on the external supporting mechanism for limiting the driving gear 242, and the cam adjusting motor 241 and the cam locking structure 243 are respectively connected to the controller through signals.

In one or more embodiments, the cam lock structure 243 includes a cam lock cylinder 2431, a cam lock lever 2432, and a press block 2433, the cam lock cylinder 2431 is signally connected to the controller, the cam lock cylinder 2431 is fixedly connected to the cam lock lever 2432, the cam lock lever 2432 is connected to the press block 2433 through a connecting rod, and the press block 2433 is located on a side of the driving gear 242 adjacent to the paper head cam 2110. Preferably, the connecting rod is sleeved in the through hole of the external support mechanism, so that the cam locking lever 2432 and the paper head cam 2110 are respectively located at two sides of the external support mechanism, and the movement of the cam locking lever 2432 is not affected. In one or more embodiments, the cam adjusting motor 241 is located at one side of the even-numbered double turnover drum 21, the cam adjusting motor 241 is fixedly connected to a cam adjusting idler gear, and the cam adjusting idler gear is connected with the driving gear 242, so that the position of the cam adjusting motor 241 is not coaxial with the even-numbered double bearing 217, and therefore the connection of the even-numbered double bearing 217 and external equipment is not affected, and the design makes the whole structure of the scheme more compact. The working principle of the cam adjusting unit 24 is as follows: the method comprises the following steps that a worker presets paper according to the specification of the paper, the paper tail can be held accurately in the overturning process, preset data of the paper are stored in a controller, and the worker only needs to input parameters; the worker controls the cam adjusting motor 241 to work through the controller, the cam adjusting motor 241 (preferably a servo motor) rotates with the driving gear 242 through the cam adjusting intermediate gear, the driving gear 242 is fixedly connected with the paper head cam 2110, therefore, the paper head cam 2110 also rotates to a set position, after the controller judges that the cam adjusting motor 241 reaches a rotation angle (a signal can be sent to the controller through a sensor, and the signal can be set through time delay of the controller), the controller controls the cam locking cylinder 2431 to work, the cam locking cylinder 2431 acts to drive the cam locking lever 2432 to move outwards, the cam locking lever 2432 drives the pressing block 2433 to move outwards until the pressing block 2433 presses the driving gear 242, the driving gear 242 is fixed, and therefore stability of the cam adjusting unit 24 in a closed state is guaranteed.

The position of the paper head cam 2110 can ensure that the double turnover cylinder 1 holds the paper head and the paper tail of the paper, in the rotation process of the even-number-times bearing 217, the paper tail holding tooth 212 flattens the paper, when the double turnover cylinder is turned to the connection position, the turnover cylinder 22 holds the paper tail to turn over the paper, the turnover is completed, and the paper is continuously rotated and transmitted to the paper transmission cylinder 23. The first paper rolling plate 218 and the second paper rolling plate 219 are both arc-shaped plates, so that paper transfer is facilitated. The reverse roller 22 is a single-diameter reverse roller.

The turnover drum 22 comprises a supporting plate 221, an end plate 222, a turnover drum gripper bar 224 and a turnover drum cam 226, wherein a plurality of supporting plates 221 and a plurality of turnover drum cams 226 are fixedly sleeved outside a bearing 223, the turnover drum cam 226 is movably sleeved outside the bearing 223, the turnover drum cam 226 is respectively positioned at two ends of the supporting plates 221, the supporting plates 221 are all fixedly connected to the turnover drum gripper bar 224, and two ends of the bearing 223 are respectively connected to the cam adjusting unit 24 and the breadth adjusting unit 25.

Overturning cylinder gripper bar 224 includes a gear block 2241, No. two gear blocks 2242, gripper shaft 2243, gripper pad 2244, install an end plate 222 on the backup pad 221 of both sides respectively, install gripper pad 2244 and gripper shaft 2243 between two end plates 222, gripper shaft 2243's both sides are fixed respectively and are cup jointed No. one gear block 2241, a gear block 2241 meshes with the rack that overturning cylinder cam 226 one side set up, control the switching of gripper bar, a plurality of grippers 2245 of equipartition on gripper shaft 2243, gripper 2245 holds in the mouth with the cooperation of gripper pad 2244 and lives the paper, gripper 2245 contacts with gripper pad 2244 and is connected the state that forms gripper. The operating principle of the turnover cylinder gripper bar 224 is as follows: the turnover drum cam 226 is fixed on an external supporting mechanism, the bearing 223 rotates under the external force driving, thereby driving the supporting plate 221, the turnover drum gripper bar 224 rotates, the first gear block 214 rotates to be meshed with the rack on one side of the turnover drum cam 226, because the first gear block 2241 is fixedly connected with the gripper shaft 2243, the gripper shaft 2243 moves relative to the turnover drum cam 226 and drives the turnover of the gripper 2245, the structure can overturn for more than 200 degrees, can grip the paper tail on the turnover drum 21 with even number times, and overturn the paper, complete the paper turnover function, and continuously and rotatably transmit the paper to the paper conveying drum 23. A second gear block 2242 is fixedly connected to the outer side of the end plate 222 and is used for being meshed with the paper conveying roller 23; the paper transfer cylinder 23 is a general paper transfer cylinder and functions only as a paper transfer. In one or more embodiments, the turnover roller 22 is driven by an external device to rotate, and the turnover roller 22 is meshed with the paper conveying roller 23 through the second gear block 2242 to provide driving force for the paper conveying roller 23; one drive can drive two devices, and the error of using two drive control accuracies is avoided, so that the paper control accuracy is higher.

The breadth adjusting unit 25 comprises a breadth adjusting even-multiple adjusting gear 251, a medium gear 252, a breadth adjusting gear 253, a paper conveying adjusting gear 254, a breadth locking structure 255, a breadth adjusting medium gear 256 and a breadth adjusting motor 257, wherein two ends of a bearing 223 are respectively fixedly sleeved with the breadth adjusting gear 253 and a turnover roller driving gear 225, the turnover roller driving gear 225 is meshed with the breadth adjusting medium gear 256, the bearing 223 is fixedly sleeved inside the breadth adjusting medium gear 256, the breadth adjusting medium gear 256 is fixedly connected to an output shaft of the breadth adjusting motor 257, the breadth adjusting motor 257 is a servo motor, and a signal of the breadth adjusting motor 257 is connected to a controller; a breadth locking structure 255 is arranged on the outer side of the breadth adjusting gear 253, two sides of the breadth adjusting gear are respectively meshed with the breadth adjusting even-multiple adjusting gear 251 and the paper conveying adjusting gear 254, a bearing of the paper conveying roller 23 is fixedly sleeved inside the paper conveying adjusting gear 254, an even-multiple bearing 217 is fixedly sleeved inside the breadth adjusting even-multiple adjusting gear 251, and the breadth locking structure 255 and the breadth adjusting motor 257 are respectively connected to the controller through signals. Preferably, the web locking structure 255 comprises a web locking lever 2551 and a web locking cylinder 2552 fixedly connected to one end of the web locking lever, wherein the web locking cylinder 2552 is in signal connection with the controller.

In one or more embodiments, the breadth adjusting gear 253 comprises an interface 2531, a housing 2532, a first breadth gear 2533 and a second breadth gear 2534 which are sequentially connected from outside to inside, the first breadth gear 2533 and the second breadth gear 2534 are connected through a breadth adjusting connecting piece 2537, a limiting block 2536 and the interface 2531 are installed inside the housing 2532, an insertion block 2535 is installed inside the interface 2531, one end of the insertion block 2535 is matched with an insertion breadth locking lever 2551, so that the insertion block 2535 can move left and right along the interface 532 under the driving of the breadth locking lever 2551, preferably, a spring is arranged on the insertion block 2535 and is located on one side far away from the breadth locking lever 2551; a limiting block 2536 is arranged at the other end of the plug-in block 2535, the limiting block 2536 can move left and right in the shell 2532 under the action of external force, and a gap is formed between the limiting block 2536 and the breadth adjusting connecting piece 2537; the first format gear 2533 is engaged with the format adjustment even-multiple adjustment gear 251, and the second format gear 2534 is engaged with the paper feed adjustment gear 254. Preferably, the width adjustment even-number times adjusting gear 251, the first width gear 2533, the second width gear 2534, and the paper feed adjusting gear 254 are all helical gears. The outer side of the shell 2532 is provided with a graduated scale which can calibrate the rotation angle of the roller for the second time. Preferably, the width adjustment gear 253 is in transmission connection with the width adjustment even-multiple adjustment gear 251 through the intermediate gear 252.

The idler gear 252 includes a first idler gear 2521, a second idler gear 2522, a third idler gear 2523, and a fourth idler gear 2524, the first idler gear 2521 and the second idler gear 2522 are coaxially fixed, the third idler gear 2523 and the fourth idler gear 2524 are coaxially fixed, the first idler gear 2521 is engaged with the second web gear 2534, the second idler gear 2522 is engaged with the third idler gear 2523, the fourth idler gear 2524 is engaged with the even multiple adjustment gear 216, and the first idler gear 2521 is a helical gear. The working principle of the web adjustment unit 25 is as follows: initially, the breadth locking lever 2551 is inserted into the interface 2531 and contacts with the plug-in unit 535, a worker inputs data into the controller according to the actual breadth adjustment requirement, the controller controls the breadth adjusting motor 257 to rotate, the breadth adjusting motor 257 drives the turning roller 22 to rotate through the breadth adjusting gear 256, as the breadth adjusting gear 253 is respectively meshed with the paper transmission modulating gear 54 and the breadth adjusting even multiple adjusting gear 251, when the turning roller 22 rotates, the even multiple turning roller 21 and the paper transmission roller 23 rotate simultaneously, when the breadth adjusting motor 257 stops rotating (namely, the three rollers reach preset positions), the controller controls the breadth locking cylinder 2552 to act, the breadth locking cylinder 522 drives the breadth locking lever 2551 to tightly press the plug-in unit 535 to the inner side, the plug-in unit 535 moves to the inner side and drives the limit block 2536 to be close to the breadth adjusting connection unit 2537 until the breadth is tightly pressed to the adjusting connection unit 2537, the whole breadth adjusting gear 253 cannot move left and right, and because the breadth adjusting even-number multiple adjusting gear 251, the first breadth gear 2533, the second breadth gear 2534, the paper conveying adjusting gear 254 and the first medium gear 2521 are all helical gears, when the first breadth gear 2533 and the second breadth gear 2534 move towards the inner side of the roller, the breadth adjusting even-number multiple adjusting gear 251, the medium gear 252 and the paper conveying adjusting gear 254 are driven to move towards the inner side of the roller and are fixed, cannot move along the axial direction of the roller, and can only rotate in the circumferential direction under the driving of external force, so that the automation degree of the scheme is high, the operation is simple, and meanwhile, in the whole operation process, the position of paper is controlled, the movement cannot be generated, and the precision is influenced.

When the processing of the batch of paper is finished and the next batch of paper is printed, a worker opens the format locking cylinder 2552 through the controller, the format locking cylinder 2552 drives the format locking cylinder 551 to move outwards, the spring overcomes the elastic force to recover deformation due to the arrangement of the spring on the insertion block 2535, the insertion piece 535 drives the limiting block 2536 to move outwards in the shell 2532 and return to the initial position, and finally the format adjusting gear 253, the format adjusting even-multiple adjusting gear 251, the intermediate gear 252 and the paper conveying adjusting gear 254 can move left and right along the axial direction under the action of external force to enter the next format adjusting cycle. The controller referred to herein is a host controller of the printing press. The operating principle of the turning part 2 is as follows: the working personnel firstly preset the paper according to the paper specification (the position of the paper head cam 2110 is adjusted through the cam adjusting unit 24, the breadth of the paper is adjusted through the breadth adjusting unit 25), the condition that the paper tail in the double-turnover roller 1 can be accurately held by the grippers 2245 in the turnover process is guaranteed, the paper head grippers 215 and the paper tail grippers 212 respectively hold the paper head and the paper tail of the paper in the rotation process of the double-turnover roller 1, the paper tail grippers 212 flatten the paper in the rotation process of the even-multiple bearing 217, when the paper is transferred to the connection position of the double-turnover roller 1 and the turnover roller 22, the turnover roller 22 holds the paper tail to turn over the paper, the turnover is completed, and the paper is continuously rotated and transferred to the paper transfer roller 23.

As shown in fig. 14 and 15, the phase adjustment mechanism 3 includes two chain tensioning units 32 symmetrically arranged, a guide rail 35 and a driving unit 36 are disposed outside the chain tensioning units 32, the guide rail 35 is used for being mounted on an external device, so that the tensioning plate 322 of the chain tensioning unit 32 can reciprocate along the guide rail 35 under the driving of the adjustment unit 6, and the driving unit 36 is in signal connection with the controller; a driven paper conveying chain wheel 33 is arranged above each chain tensioning unit 32, a driving paper conveying chain wheel 37 is arranged below each chain tensioning unit 32, the driven paper conveying chain wheel, the driving paper conveying chain wheel and the driving paper conveying chain wheel form a transmission structure, and a paper gripping tooth row 34 and a guide plate 31 are arranged between the two chain tensioning units 32. Preferably, the two symmetrical driven paper conveying sprockets 33, the two driving paper conveying sprockets 37 and the two chain tensioning units 32 are all fixedly connected, so that the consistency of the phases at the two sides of the phase adjusting mechanism 3 is effectively ensured.

One side of the chain tensioning unit 32 is provided with a locking limiting unit 39 for limiting the position of the chain tensioning unit 32, and the locking limiting unit 39 is in signal connection with the controller. In one embodiment, the driving units 36 are respectively connected to the two chain tensioning units 32, a guide rail 35 is disposed on the outer side of one chain tensioning unit 32, and a locking limiting unit 39 is disposed on the outer side of the other chain tensioning unit 32, so that the guide rail 35 is prevented from blocking a limiting portion of the locking limiting unit 39, the production of the tensioning plate 322 is facilitated, a limiting structure of the tensioning plate 322 is not specially arranged, the guide rail 35 is avoided, and the process and production cost is saved. In another embodiment, the driving unit 36 is respectively connected to the two chain tensioning units 32, and a guide rail 35 and a locking limiting unit 39 are arranged outside any one of the chain tensioning units 32, so that the equipment space is saved, and the floor area is reduced. And the locking limiting unit 39 is used for limiting the chain tensioning unit 32.

A bracket 38 is respectively provided above and below the chain tension unit 32 to ensure the stability of the chain tension unit 32, the driven paper transfer sprocket 33 and the driving paper transfer sprocket 37. Two sides of the driven paper conveying sprocket 33 are respectively provided with a limiting plate 310 for limiting the adjusting position of the driven paper conveying sprocket 33 and ensuring that the phase adjusted by the phase adjusting mechanism 3 does not exceed the maximum set value. The stopper plate 310 is mounted on the bracket 38. In one embodiment, the guide plate 31 is installed between the two brackets 38 that are bilaterally symmetrical, so that the phase adjustment mechanism 3 can be conveniently and integrally installed when the printing machine is assembled, the guide plate 31 does not need to be installed on an external supporting device, the assembly difficulty is greatly reduced, and the working efficiency is improved. The chain tensioning unit 32 comprises a tensioning chain 321, a tensioning plate 322, a driven wheel 323 and a driving wheel 324, the tensioning chain 321 is sequentially sleeved outside the driven wheel 323, the driving paper conveying chain wheel 37, the driving wheel 324 and the driven paper conveying chain wheel 33 to form a transmission structure, the driving wheel 324 and the driven wheel 323 are fixedly connected through the tensioning plate 322, and the lower part of the tensioning plate 322 is connected with the adjusting unit 6. Preferably, the tension plate 322 is provided with a plurality of limiting holes 3222, each limiting hole 3222 is matched with one locking limiting unit 39 to limit the tension plate 322, and the bottom of the tension plate 322 is provided with a connecting member 3221.

The adjusting unit 6 comprises an adjusting motor 361, a driving part 362 and a connecting rod, wherein the connecting rod is respectively fixedly connected with two driving parts 362, each driving part 362 is matched with one connecting part 3221 to form a transmission structure, one end of the connecting rod is fixedly connected to the adjusting motor 361, the adjusting motor 361 is in signal connection with the controller, a worker controls the adjusting motor 361 to rotate through the controller, the adjusting motor 361 controls the driving part 362 and the rack 221 to move, the tensioning plate 322 is driven to move leftwards and rightwards, and the chain tensioning unit 32 is finally driven to move accurately, so that the phase of the driven paper conveying chain wheel 33 is changed. The adjustment motor 361 is preferably a servo motor. In one embodiment, the driving member 362 and one of the connecting members 3221 are engaged by a gear and a rack, i.e., the driving member 362 is a gear and the connecting member 3221 is a rack. In another embodiment, the driving member 362 and one of the connecting members 3221 are engaged by a lead screw and a nut, i.e., the driving member 362 is a lead screw and the connecting member 3221 is a nut. A bracket 38 is provided above and below the driven wheel 323, respectively.

The locking and limiting unit 39 comprises a limiting rod 391, a locking cylinder 392 and a locking lever 393, the locking cylinder 392 is connected to the limiting rod 391 through the locking lever 393, the limiting rod 391 is used for being inserted into the limiting hole 3222 to limit the tension plate 322, and the locking cylinder 392 is in signal connection with the controller. The lockout cylinder 392 is mounted on the external support device.

The working principle of the phase adjusting mechanism 3 is as follows: the driving paper conveying chain wheel 37 is fixedly connected with a host, the guide rail 35 and the locking cylinder 392 are fixedly arranged on the host or an external supporting device, a worker inputs the width parameter of paper into a controller, the controller controls the adjusting motor 361 to rotate to a set revolution number according to a set program, the adjusting motor 361 drives the tension plate 322 to accurately move to a set position, and the tension plate 322 moves so as to drive the driven paper conveying chain wheel 33 to rotate through the tension chain 321, so that the phase adjustment is completed; after the controller determines that the adjusting motor 361 stops working, the controller controls the locking cylinder 392 to work, and since the locking cylinder 392 is installed on the host or the external supporting device, the locking cylinder 392 drives the limiting rod 391 to be inserted into one side edge of the limiting hole 3222 through the locking lever 393 to lock and limit the tension plate 322. The phase adjusting mechanism 3 can be used for adjusting the breadth of the ink-jet digital printer, and the corresponding chain phase is changed by the adjusting motor 361 of the mechanism according to the difference value of the breadth adjustment, so that the relative position of the closed-loop paper path of the whole digital printer is unchanged, and the accuracy of paper transmission is ensured.

The controller presented in this scheme is the host controller of the user device.

The principle of the single-paper double-sided code spraying machine is as follows:

as shown in fig. 2 and 3, the printing cylinder 1 is located below the aqueous inkjet system 5, the printing cylinder 1, the single-diameter paper transfer cylinder 42, and the even-number-times paper transfer cylinder 41 are arranged in sequence, and the axes of the three are arranged in a collinear manner, and the even-number-times paper transfer cylinder 41 receives a new sheet of the stack 72 through the paper feed shaft 71 of the paper feed portion 7; the right side of the printing cylinder 1 is provided with a phase adjusting mechanism 3, the phase adjusting mechanism 3 is positioned below the paper conveying part 4, the turning end of the printing cylinder 1 is tangent to the even-number multiple turning cylinder 21, the paper conveying cylinder 23 is positioned below the driving paper conveying chain wheel 37, the left side of the printing cylinder 1 is close to the paper collecting cylinder 61 of the paper collecting part 6, the paper collecting cylinder 61 conveys printed paper to a paper collecting pile 63 through a paper collecting tension chain wheel 62, and drying lamp sets 64 are arranged at the position of the paper after the first printing of the printing cylinder 1, the position of the paper before the turning part 2 and the position of the paper collecting cylinder 61 and used for drying ink jet on the printed paper. The outer side of the printing cylinder 1 is also tangent to a paper pressing wheel 8, and the paper pressing wheel 8 is positioned between the paper conveying part 4 and the underwater ink jet system 5.

The working principle of the single-paper double-sided code spraying machine is as follows:

the sheet-fed ink-jet digital printing machine platform adopts a roller type, paper is transferred from one roller to the next roller through roller transfer and handover, in the handover process, when tooth rows of two adjacent rollers rotate to the central line of the two rollers, the roller holding the paper opens the paper holding tooth row, releases the paper, closes the paper holding tooth row on the other roller, holds the paper to continue rotating, and the paper is transferred from one roller to the other roller to complete handover and transfer; the number of the paper conveying rollers in the paper conveying part 4 is adjusted and confirmed by a worker according to the length of the paper, and the phase adjusting mechanism 3 is controlled by the controller to be automatically adjusted to a corresponding position according to the size and specification of the paper, so that the circulation of the whole closed paper path is ensured to be unchanged; when single-side printing is needed, a worker adjusts function related parameters, the paper conveying shaft 72 transmits paper from the paper stack 72 to the even-number times paper conveying roller 41, the paper is transmitted to the printing roller 1 through the single-diameter paper conveying roller 42, the paper is directly transmitted to the paper collecting part 6 after being printed through the water-based ink jet system 5, and the paper collecting part 6 is used for transmitting and collecting the printed paper and is not in a printing closed paper path; when double-sided printing is needed, a worker adjusts relevant functional parameters, the paper conveying shaft 72 transmits paper from the paper stack 72 to the even-number times paper conveying roller 41, the paper is transmitted to the printing roller 1 through the single-diameter paper conveying roller 42, the paper continuously rotates along with the printing roller 1 after being printed on a first page through the water-based ink jet system 5, the paper is transmitted to the even-number times turnover roller 21, the paper is turned over in the turnover part 2 and then transmitted to the even-number times paper conveying roller 41 again after passing through the phase adjusting mechanism 3, the paper is transmitted to the printing roller 1 through the single-diameter paper conveying roller 42, a second page is directly transmitted to the paper collecting part 6 after being printed on a second page through the water-based ink jet system 5, and the paper collecting part 6 is used for transmitting and collecting the printed paper, and the printed paper is not in a printing closed paper path. This scheme adopts the roller mode, and the advanced tilting mechanism of cooperation realizes two-sided printing, guarantees printing precision and printing quality. The defects of single paper type and inflexible use of the roll paper ink-jet digital printer are overcome.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (7)

1. Two-sided ink jet numbering machine of sheet-fed, including the water-based ink jet system that printing cylinder top set up and the collection part that one side set up, its characterized in that: the other side of the printing cylinder is respectively provided with a paper conveying part for conveying paper, an overturning part for overturning the paper and a phase adjusting mechanism for adjusting the phase of the paper, the paper conveying part and the overturning part are respectively positioned at the upper end and the lower end of the phase adjusting mechanism, the outer wall of the printing cylinder is provided with a single-sided paper gripping mechanism and a double-sided paper gripping mechanism in a staggered manner, one end of the printing cylinder is provided with a single-sided cam and a double-sided cam, the double-sided cam is connected to an air cylinder, and the air cylinder is connected to a controller through signals; when single-sided printing is needed, the single-sided paper gripping mechanism and the double-sided paper gripping mechanism are matched with the single-sided cam to grip paper; when double-sided printing is needed, only the double-sided paper gripping mechanism is matched with the double-sided cam to grip paper, and double-sided switching of single paper is achieved.

2. A sheet-fed two-sided inkjet printer according to claim 1, wherein: one side of the printing cylinder is respectively provided with a single-diameter paper conveying cylinder and an even-number-times turning cylinder, the even-number-times paper conveying cylinder is positioned above a driven paper conveying chain wheel of the phase adjusting mechanism, and a driving paper conveying chain wheel of the phase adjusting mechanism is positioned above the paper conveying cylinder of the turning part.

3. A sheet-fed two-sided inkjet printer according to claim 1, wherein: the printing cylinder is provided with a paper tail adsorption device, the paper tail adsorption device is provided with a suction seat for adsorbing paper, the upper surface of the suction seat is tangent to the diameter of the cylinder, and the suction seat and the cylinder can move relative to each other along the circumferential direction of the cylinder.

4. A sheet-fed two-sided inkjet printer according to claim 1, wherein: the turnover part comprises a breadth adjusting unit and an even-number-times turnover roller, a turnover roller and a paper conveying roller which are sequentially arranged on one side of the breadth adjusting unit in parallel, the breadth adjusting unit is used for adjusting the breadth of paper, a cam adjusting unit used for adjusting a paper head cam is installed on one side of the even-number-times turnover roller, and the breadth adjusting unit and the cam adjusting unit are respectively connected to the controller through signals.

5. The sheet-fed two-sided inkjet printer according to claim 4, characterized in that: the cam adjusting unit comprises a driving gear and a cam locking structure for limiting the driving gear, wherein the two sides of the driving gear are fixedly connected with a cam adjusting motor and a paper head cam respectively, and the cam adjusting motor and the cam locking structure are in signal connection with the controller respectively.

6. The sheet-fed two-sided inkjet printer according to claim 4, characterized in that: the breadth adjusting unit comprises a breadth adjusting even-number-time adjusting gear, a breadth adjusting gear, a paper conveying adjusting gear, a breadth locking structure and a breadth adjusting motor, the two ends of a bearing of the turnover roller are fixedly sleeved with the breadth adjusting gear and the turnover roller driving gear respectively, the turnover roller driving gear is fixedly connected to the breadth adjusting motor, the outside of the breadth adjusting gear is provided with the breadth locking structure, the two sides of the breadth adjusting gear are meshed with the breadth adjusting even-number-time adjusting gear and the paper conveying adjusting gear respectively, a bearing of the paper conveying roller is fixedly sleeved inside the paper conveying adjusting gear, a bearing of the even-number-time turnover roller is fixedly sleeved inside the breadth adjusting even-number-time adjusting gear, and the breadth locking structure and the breadth adjusting motor are connected to the controller through signals respectively.

7. A sheet-fed two-sided inkjet printer according to claim 1, wherein: the phase adjusting mechanism comprises two chain tensioning units which are symmetrically arranged, a guide rail and a driving unit are arranged on the outer side of each chain tensioning unit, the guide rail is arranged on external equipment, so that a tensioning plate of each chain tensioning unit can move left and right along the guide rail under the driving of the adjusting unit, and the driving unit is in signal connection with the controller; the upper end and the lower end of each chain tensioning unit are respectively provided with a driven paper conveying chain wheel and a driving paper conveying chain wheel which form a transmission structure, and a paper gripping tooth row and a guide plate are arranged between the two chain tensioning units.

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