CN117734312A - Folding fan type digital printing unit for web printing - Google Patents

Abstract

The invention relates to the technical field of package printing, in particular to a folding fan type digital printing unit for web printing, which comprises a frame, an ink collecting box, a folding fan type jet printing trolley set, a trolley driving mechanism and a lifting mechanism, wherein a plurality of printing guide rollers, a paper feeding guide roller and a paper discharging guide roller are rotatably connected to the inner side of the frame; the folding fan type spray printing trolley set comprises a plurality of groups of spray printing trolleys which are arranged in a fan shape, and a spray head is arranged at the bottom of each group of spray printing trolleys; the ink collecting box is connected to the top of the lifting mechanism, the initial position of the folding fan type jet printing trolley set is located right above the ink collecting box, and the spray heads of the jet printing trolley sets extend into the ink collecting box. The folding fan type digital printing unit provided by the invention is convenient to operate, simple in structure, convenient for cleaning and maintaining the spray head, and capable of avoiding blocking of the spray nozzle of the spray head.

Description

Folding fan type digital printing unit for web printing

Technical Field

The invention relates to the technical field of package printing, in particular to a folding fan type digital printing unit for web printing.

Background

Digital printing is the digitization of the printing technique, which generally refers to the digitization of part or all of the entire process. The digital ink jet printing equipment is a non-contact printing mode, the ink is selectively sprayed onto a printing stock at a certain speed through the nozzle of a printing spray head, and finally, the ink forms a stable image on the printing stock through the interaction of the ink and the printing stock. In order for the print to have a sufficiently high print density and resolution, and a certain degree of security, the ink is required to have a sufficiently fast drying speed. Therefore, when the printing nozzle does not work, if the printing nozzle is not covered in time, the ink remained on the surface of the nozzle is easy to dry, the nozzle of the printing nozzle is blocked, and inconvenience is brought to maintenance equipment and production work.

Disclosure of Invention

The present invention aims to solve the above problems and provide a folding fan type digital printing unit for web printing.

In order to achieve the above purpose, the invention adopts the following technical scheme: a folding fan type digital printing unit for web printing comprises a frame, an ink collecting box, a folding fan type jet printing trolley set, a trolley driving mechanism and a lifting mechanism, wherein a plurality of printing guide rollers, a paper feeding guide roller and a paper discharging guide roller are rotatably connected to the inner side of the frame, and paper to be printed is wound on the printing guide rollers; the folding fan type jet printing trolley set is connected between the frame and the folding fan type jet printing trolley set and used for driving the folding fan type jet printing trolley set to slide left and right along the guide rail; the folding fan type jet printing trolley set comprises a plurality of groups of jet printing trolleys which are arranged in a fan shape, and a spray head is arranged at the bottom of each group of jet printing trolleys; the lifting mechanism is arranged on the outer side of the frame, the ink collecting box is connected to the top of the lifting mechanism, the initial position of the folding fan type jet printing trolley set is positioned right above the ink collecting box, and the spray heads of the jet printing trolley sets extend into the ink collecting box; the trolley driving mechanism drives the jet printing trolley to move along the guide rail, enter the region where the paper roll to be printed is located, and jet print the paper roll; after the jet printing is finished, the trolley driving mechanism drives the jet printing trolley to move along the guide rail, so that the folding fan type jet printing trolley returns to the initial position.

Based on the technical scheme, the invention can also be improved as follows:

further, the frame includes two wallboards, and two wallboards are a left and right vertical setting, a plurality of printing guide rollers, paper feed guide roller and paper output guide roller rotationally connect between two wallboards, and every wallboard is equipped with one and supplies the through guide hole that spouts the seal dolly and pass through, and the through guide hole of two wallboards aligns along left and right directions, and the lower border of through guide hole is middle high, both sides low convex.

Further, the frame is still including locating the printing platform between two wallboards, and this printing platform is including a plurality of horizontal poles of connecting between two wallboards, and this a plurality of horizontal poles are convex arrangement and equidistant interval each other along the fore-and-aft direction, and the transversal section of every horizontal pole is square, and printing platform surface centre that a plurality of horizontal poles constitute is high, both sides are low.

Further, the plurality of printing guide rollers are arranged in an arc shape along the front-back direction and are equidistantly spaced from each other, the arc shape formed by the arrangement of the plurality of printing guide rollers is high in the middle and low in the two sides, the plurality of printing guide rollers and the plurality of cross bars are staggered, one printing guide roller is arranged between two adjacent cross bars, and the printing guide rollers protrude upwards from the surfaces of the cross bars.

Further, the frame is still including locating the backup pad at two wallboard tops, and the backup pad is the integrative welded box board structure that forms of a plurality of crossbeams, and the backup pad sets up along the level, and the backup pad runs through the guide hole that runs through two wallboards from right left, and the backup pad passes through the screw and is connected fixedly with two wallboards, and the upper surface butt of backup pad is two wallboard's of the upper edge of the guide hole that runs through, and the bottom of backup pad is equipped with along its length direction the guide rail.

Further, two ends of the supporting plate are fixedly connected with two side plates through screws, the trolley driving mechanism is arranged between the two side plates and is a plurality of magnetic coupling type rodless cylinders arranged between the two side plates, and sliding magnets of the magnetic coupling type rodless cylinders are fixedly arranged on the tops of the folding fan type jet printing trolley set.

Further, the frame is still including setting up in the support frame in one of them wallboard outside, and the support frame is stretched out to the wallboard outside and is located the support frame directly over, and elevating system sets up between support frame and receipts ink horn, and elevating system is including installing four screw lifts on the support frame, two commutators and lift speed reducer, the lift connecting rod of connection between screw lift, the speed reducing connecting rod of connection between lift speed reducer and commutator and the elevator motor of being fixed with lift speed reducer installation, and four screw lifts correspond to be connected with receipts ink horn bottom.

Further, the top of the plurality of groups of jet printing trolley is correspondingly connected and fixed with the sliding magnets of the plurality of magnetic coupling type rodless cylinders, each group of jet printing trolley further comprises two sliding side plates, a box body clamped between the two sliding side plates and a control circuit board arranged on one side of the box body, the spray head is arranged at the bottom of the box body, and the top of the sliding side plate is slidably arranged on the guide rail and correspondingly connected and fixed with the sliding magnets of the magnetic coupling type rodless cylinders.

Further, the bottom surface of the box body is a spray printing surface, the spray printing surfaces are provided with the spray nozzles, the spray printing surfaces of the spray printing trolleys are arranged into arc surfaces, and the arc surfaces are high in the middle and low in the two sides.

The beneficial effects of the invention are as follows: the folding fan type digital printing unit provided by the invention is convenient for moving the folding fan type jet printing trolley to a proper position of a region where a paper roll to be printed is located to jet print the paper roll by arranging the trolley driving mechanism connected between the frame and the ink receiving box and the lifting mechanism connected between the frame and the ink receiving box, and after the jet printing is finished, the folding fan type jet printing trolley automatically returns to an initial position, and the lifting mechanism drives the ink receiving box to lift, so that the spray head stretches into a groove of the ink receiving box to receive waste ink on the spray head through the ink receiving box, and the waste ink is collected and concentrated for treatment. Therefore, the folding fan type digital printing unit provided by the invention is convenient to operate, simple in structure, convenient for cleaning and maintaining the spray head, and capable of avoiding blocking of the spray nozzle of the spray head.

Drawings

The invention will be further described with reference to the drawings and examples.

FIG. 1 is a schematic diagram of a folding fan digital printer unit for web printing according to a preferred embodiment of the present invention;

FIG. 2 is a front view of the folding fan digital printer unit of FIG. 1;

FIG. 3 is a left side view of the folding fan digital printer unit of FIG. 1;

FIG. 4 is a top view of the folding fan digital printer unit of FIG. 1;

FIG. 5 is a schematic view of the folding fan type jet printing carriage set and carriage driving mechanism of FIG. 1;

in the figure: 12. a wallboard; 14. a cross bar; 120. a through guide hole; 15. a support plate; 151. a side plate; 152. a guide rail; 16. a support frame; 21. a printing guide roller; 22. a paper feed guide roller; 23. a paper outlet guide roller; 30. collecting the ink box; 40. a magnetically coupled rodless cylinder; 42. a sliding magnet; 50. folding fan type jet printing trolley set; 51. a drag chain; 52. spray printing trolley; 520. spraying a printing surface; 521. sliding the side plates; 522. a case; 523. a spray head; 524. a control circuit board; 525. an overhaul window; 526. an observation window; 60. a lifting mechanism; 61. a screw elevator; 62. a commutator; 63. lifting a connecting rod; 64. a coupling; 65. a lifting speed reducer; 66. a lifting motor; 67. a deceleration link; 70. and (3) a paper roll.

Detailed Description

The invention will now be described in further detail with reference to the drawings and examples, which are simplified schematic illustrations of the basic structure of the invention, which are presented only by way of illustration, and thus show only the structures that are relevant to the invention.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first", "a second", etc. may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.

In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication 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 in a specific case.

As shown in fig. 1 to 5, a folding fan type digital printing unit for web printing according to a preferred embodiment of the present invention includes a frame, an ink receiving box 30, a folding fan type jet printing dolly set 50, a dolly driving mechanism connected between the frame and the ink receiving box 30, and a lifting mechanism 60 connected between the frame and the ink receiving box 30.

The frame comprises two wallboards 12, a printing table arranged between the two wallboards 12, a supporting plate 15 arranged at the top of the two wallboards 12 and a supporting frame 16 arranged at the outer side of one wallboard 12.

The two wallboards 12 are vertically arranged left and right, each wallboard 12 is provided with a through guide hole 120, the through guide holes 120 of the two wallboards 12 are aligned along the left and right directions, and the lower edge of the through guide hole 120 is in the shape of a circular arc with high middle and low two sides.

The supporting plate 15 is a box plate structure formed by integrally welding a plurality of cross beams, the supporting plate 15 is horizontally arranged, the supporting plate 15 penetrates through the penetrating guide holes 120 of the two wall plates 12 from right to left, the supporting plate 15 is fixedly connected with the two wall plates 12 through screws, and the upper surface of the supporting plate 15 is abutted against the upper edges of the penetrating guide holes 120 of the two wall plates 12; a portion of the support plate 15 extends outside the wall plate 12 and is located directly above the support frame 16, and a guide rail 152 is provided at the bottom of the support plate 15 along the length direction thereof. Two ends of the supporting plate 15 are fixedly connected with two side plates 151 through screws, the trolley driving mechanism is arranged between the two side plates 151, the top of the folding fan type jet printing trolley set 50 is slidably arranged on the guide rail 152 and connected with the trolley driving mechanism, and the folding fan type jet printing trolley set 50 is driven to move left and right along the guide rail 152 through the trolley driving mechanism. In this embodiment, the trolley driving mechanism is a plurality of magnetically coupled rodless cylinders 40 installed between two side plates 151, and the sliding magnet 42 of the magnetically coupled rodless cylinders 40 is fixed to the top of the folding fan type jet printing trolley set 50.

Preferably, a drag chain 51 is connected between the left side plate 151 and the folding fan type jet printing trolley set 50, the drag chain 51 moves along with the jet printing trolley set 50, and circuits and pipelines are arranged inside the drag chain 51 and used for protecting the circuits and the pipelines inside.

The printing table is used for leveling the paper roll 70 and ensuring the jet printing precision; the printing table comprises a plurality of cross bars 14 connected between two wallboards 12, the cross bars 14 are arranged in a circular arc shape along the front-back direction and are equidistantly spaced from each other, the cross section of each cross bar 14 is square, and the middle of the surface of the printing table formed by the cross bars 14 is high and the two sides are low.

The paper roll 70 is wound on the printing guide rollers 21, the paper feeding guide roller 22 and the paper discharging guide roller 23, the printing guide rollers 21 support the paper roll 70 upwards, and the paper feeding guide roller 22 and the paper discharging guide roller 23 press the paper roll 70 downwards. The plurality of printing guide rollers 21 provide tension to the paper roll 70, and together with the printing table, ensure flatness of the paper roll 70; the paper feed guide rollers 22 are guide rollers for winding the paper roll 70 from one set to another, and function to plan a paper path. The paper feeding guide roller 22 is rotatably connected to the bottoms of the front sides of the two wallboards 12, and the paper discharging guide roller 23 is rotatably connected to the bottoms of the rear sides of the two wallboards 12; the printing guide rollers 21 are positioned above the paper feeding guide roller 22 and the paper discharging guide roller 23, and two ends of each printing guide roller 21 are rotatably connected to the middle position of the wall plate 12; the plurality of printing guide rollers 21 are arranged in a circular arc shape along the front-back direction and are equidistantly spaced from each other, the arc shape formed by arranging the plurality of printing guide rollers 21 is high in the middle and low on two sides, the plurality of printing guide rollers 21 and the plurality of cross bars 14 are staggered, one printing guide roller 21 is arranged between two adjacent cross bars 14, and the printing guide rollers 21 protrude upwards from the surfaces of the cross bars 14.

The folding fan type jet printing trolley set 50 comprises a plurality of groups of jet printing trolleys 52, and each group of jet printing trolleys 52 can independently move or four groups of jet printing trolleys 52 can simultaneously move under the action of a trolley driving mechanism. The top of the plurality of groups of jet printing trolleys 52 is correspondingly connected and fixed with the sliding magnets 42 of the plurality of magnetic coupling type rodless cylinders 40, and the plurality of groups of jet printing trolleys 52 are arranged along the front-back direction. In this embodiment, the number of the spray printing trolleys 52 is four, the four spray printing trolleys 52 are arranged in a fan shape, and the four spray printing trolleys 52 spray-print four colors respectively.

Each set of jet printing carriages 52 is used for jet printing various patterns on the paper roll, and comprises two sliding side plates 521, a box 522 arranged between the two sliding side plates 521 in a clamping manner, a plurality of spray heads 523 arranged at the bottom of the box 522, and a control circuit board 524 arranged at one side of the box 522.

The top of the sliding side plate 521 is slidably mounted on the guide rail 152 and is correspondingly connected and fixed with the sliding magnet 42 of the magnetic coupling type rodless cylinder 40; the sliding side plate 521 is provided with an inspection window 525 and an observation window 526, and an acrylic decorative plate is mounted on the window of the inspection window 525, and when the installation or maintenance is required, the acrylic decorative plate can be opened for maintenance. The state of the nozzle 523 inside the jet printing carriage 52 is conveniently observed by providing the observation window 526.

The bottom surface of the box 522 is a spray printing surface 520, the spray printing surface 520 is perpendicular to the surface of the paper to be printed, the spray printing surface 520 is provided with a plurality of spray heads 523, and the spray heads 523 adopt epson S3200 spray heads for digital spray printing; in order to adapt to the paper rolls 70 wound on the plurality of printing guide rollers 21 and protruding upwards in an arc shape, the printing surfaces 520 of the plurality of groups of printing trolleys 52 are arranged into arc surfaces, the arc surfaces are high in the middle and low on two sides, the arc surfaces are based on a circle with a radius of 2 meters, and the radian between the printing surfaces 520 of two adjacent printing trolleys 52 is 6 degrees.

The control circuit board 524 controls the lifting motor 66 and the magnetically coupled rodless cylinder 40 to control the motion of the whole jet printing process. An optical eye for sensing the position below the nozzle 523 may also be provided on the printing surface 520, and the optical eye transmits the sensed position signal to the control circuit board 524.

When the ink collecting box 30 is used for cleaning the spray heads 523 of the folding fan type jet printing trolley set 50, waste ink on the spray heads 523 of the jet printing trolley 52 is received, and the waste ink is collected and concentrated for treatment. The ink collecting box 30 is provided with a groove for receiving waste ink on the nozzle 523 of the jet printing trolley 52, and the groove of the ink collecting box 30 is also provided with a liquid inlet for inflow of cleaning liquid.

The lifting mechanism 60 is disposed between the support frame 16 and the ink-receiving box 30, and provides support and power for lifting and lowering the ink-receiving box 30. The elevating mechanism 60 includes four screw lifters 61, two commutators 62 and elevating speed reducers 65 mounted on the support frame 16, elevating links 63 connected between the screw lifters 61, speed reducing links 67 connected between the elevating speed reducers 65 and the commutators 62, and elevating motors 66 mounted and fixed to the elevating speed reducers 65. The four spiral lifters 61 are correspondingly connected with the bottom of the ink receiving box 30, two lifting connecting rods 63 are arranged, and the lifting connecting rods 63 are connected with the spiral lifters 61 positioned on two sides of the supporting frame 16 through couplings 64; the two speed reducing connecting rods 67 are symmetrically arranged on two sides of the lifting speed reducer 65, the speed reducing connecting rods 67 are respectively connected with the reverser 62 and the lifting speed reducer 65 through the couplings 64, the two reversers 62 are symmetrically arranged on two sides of the lifting speed reducer 65, the reverser 62 is also oppositely arranged with the spiral lifter 61, and the reverser 62 is connected with the spiral lifter 61 through the couplings 64. The reverser 62 is used for enabling the spiral lifter 61 to be connected with the lifting speed reducer 65, so that one lifting motor 66 synchronously controls four spiral lifters 61, and the structure is simple and the control is convenient.

In use of the invention, the paper roll 70 enters the print receiving roll 21 and the print station after entering from the paper feed roll 22. The initial position of the folding fan type jet printing trolley set 50 is located right above the ink collecting box 30, in normal operation, the trolley driving mechanism drives the jet printing trolley 52 to move from right to left, the jet printing trolley enters a proper position of an area where a paper roll to be printed is located, after the photo eyes sense position marks, position signals are transmitted to the control circuit board 524, and jet printing is started after the jet printing trolley 52 receives the jet printing signals. In the spray printing process, each group of spray printing trolleys 52 can automatically track positions through a vision system, so that the spray printing positions of the four groups of spray printing trolleys 52 are ensured to be accurate. After the jet printing is finished, the trolley driving mechanism drives the jet printing trolley 52 to move from left to right, the folding fan type jet printing trolley set 50 returns to the initial position, the lifting mechanism 60 drives the ink collecting box 30 to ascend, the spray heads 523 are subjected to moisturizing, cleaning and maintenance, the spray heads 523 extend into grooves of the ink collecting box 30, cleaning liquid flows into the grooves through the liquid inlet holes to soak and clean the spray heads 523, so that the surface of the spray heads 523 cannot be irradiated by visible light in the idle process, dust particles cannot be stained, nozzle blockage of the spray heads 523 is avoided, and printing quality and service life are improved. When the head 523 does not require maintenance for moisturizing, the lift mechanism 60 drives the ink tank 30 to descend to the lowest point.

The folding fan type digital printing unit provided by the invention is convenient for moving the folding fan type jet printing trolley set 50 to a proper position of a region where a paper roll 70 to be printed is located to jet print the paper roll 70 by arranging the trolley driving mechanism connected between the frame and the ink receiving box 30 and the lifting mechanism 60 connected between the frame and the ink receiving box 30, and after the jet printing is finished, the folding fan type jet printing trolley set 50 automatically returns to the initial position, the lifting mechanism 60 drives the ink receiving box 30 to lift, so that the spray head 523 extends into a groove of the ink receiving box 30 to receive waste ink on the spray head 523 through the ink receiving box 30, and the waste ink is collected and concentrated. Therefore, the folding fan type digital printing unit provided by the invention is convenient to operate, simple in structure, convenient to clean and maintain the spray heads 523 and capable of avoiding nozzle blockage of the spray heads 523.

The above description of the embodiments of the present invention, which is not related to the present invention, belongs to the technology known in the art, and may be implemented with reference to the technology known in the art.

The above-described preferred embodiments according to the present invention are intended to suggest that, from the above description, various changes and modifications can be made by the person skilled in the art without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.

Claims (9)

1. A folding fan type digital printing unit for web printing, includes frame, its characterized in that: the device also comprises an ink collecting box, a folding fan type jet printing trolley set, a trolley driving mechanism and a lifting mechanism, wherein a plurality of printing guide rollers, a paper feeding guide roller and a paper discharging guide roller are rotatably connected to the inner side of the frame, and paper to be printed is wound on the printing guide rollers; the folding fan type jet printing trolley set is connected between the frame and the folding fan type jet printing trolley set and used for driving the folding fan type jet printing trolley set to slide left and right along the guide rail; the folding fan type jet printing trolley set comprises a plurality of groups of jet printing trolleys which are arranged in a fan shape, and a spray head is arranged at the bottom of each group of jet printing trolleys; the lifting mechanism is arranged on the outer side of the frame, the ink collecting box is connected to the top of the lifting mechanism, the initial position of the folding fan type jet printing trolley set is positioned right above the ink collecting box, and the spray heads of the jet printing trolley sets extend into the ink collecting box; the trolley driving mechanism drives the jet printing trolley to move along the guide rail, enter the region where the paper roll to be printed is located, and jet print the paper roll; after the jet printing is finished, the trolley driving mechanism drives the jet printing trolley to move along the guide rail, so that the folding fan type jet printing trolley returns to the initial position.

2. The folding fan type digital printing unit for web printing as recited in claim 1, wherein: the frame includes two wallboards, and a left-right vertical setting of two wallboards, a plurality of printing deflector rolls, paper feed deflector rolls and paper delivery deflector rolls rotationally connect between two wallboards, and every wallboard is equipped with one and supplies the perforation guide hole that spouts the seal dolly and pass through, and the perforation guide hole of two wallboards aligns along controlling the direction, and the lower border of perforation guide hole is middle high, both sides arc low.

3. The folding fan type digital printing unit for web printing as recited in claim 2, wherein: the frame is still including locating the printing platform between two wallboards, and this printing platform includes a plurality of horizontal poles of connecting between two wallboards, and this a plurality of horizontal poles are convex arrangement and equidistant interval each other along the fore-and-aft direction, and the transversal cross-section of every horizontal pole is square, and printing platform surface centre that a plurality of horizontal poles constitute is high, both sides are low.

4. A folding fan type digital printing unit for web printing as claimed in claim 3, wherein: the printing guide rollers are arranged in an arc shape along the front-back direction and are equidistantly spaced from each other, the arc shape formed by arranging the printing guide rollers is high in the middle and low on two sides, the printing guide rollers and the cross bars are staggered, one printing guide roller is arranged between two adjacent cross bars, and the printing guide rollers protrude upwards from the surfaces of the cross bars.

5. The folding fan type digital printing unit for web printing as recited in claim 4 wherein: the frame is still including locating the backup pad at two wallboard tops, and the backup pad is the integrative welded box board structure that forms of a plurality of crossbeams, and the backup pad sets up along the level, and the backup pad runs through the guide hole that runs through two wallboards from right left, and the backup pad passes through the screw to be connected fixedly with two wallboards, and the upper surface butt of backup pad is two wallboard's of the upper edge that runs through the guide hole, and the bottom of backup pad is equipped with along its length direction the guide rail.

6. The folding fan type digital printing unit for web printing as recited in claim 5, wherein: two ends of the supporting plate are fixedly connected with two side plates through screws, the trolley driving mechanism is arranged between the two side plates and is a plurality of magnetic coupling type rodless cylinders arranged between the two side plates, and sliding magnets of the magnetic coupling type rodless cylinders are fixedly arranged on the tops of the folding fan type jet printing trolley set.

7. The folding fan type digital printing unit for web printing as recited in claim 6, wherein: the frame is still including setting up in the support frame in one of them wallboard outside, and the part of backup pad stretches out the wallboard outside and is located the support frame directly over, and elevating system sets up between support frame and receipts ink horn, and elevating system is including installing four screw lifts on the support frame, two commutators and lift speed reducer, the lift connecting rod of connecting between screw lift, the speed reducing connecting rod of connecting between lift speed reducer and commutator and the elevator motor of being fixed with lift speed reducer installation, and four screw lifts correspond to be connected with receipts ink horn bottom.

8. The folding fan type digital printing unit for web printing as recited in claim 7, wherein: the top of the plurality of groups of jet printing trolleys is correspondingly connected and fixed with the sliding magnets of the plurality of magnetic coupling type rodless cylinders, each group of jet printing trolleys further comprises two sliding side plates, a box body clamped between the two sliding side plates and a control circuit board arranged on one side of the box body, the shower nozzle is installed in the bottom of the box, and sliding side plate top slidable mounting is in the guide rail and correspond and be connected fixedly with the sliding magnet of magnetic coupling formula rodless cylinder.

9. The folding fan type digital printing unit for web printing as recited in claim 8, wherein: the bottom surface of the box body is a spray printing surface, the spray printing surfaces are provided with a plurality of spray heads, the spray printing surfaces of the spray printing trolleys are arranged into arc surfaces, and the arc surfaces are high in the middle and low in the two sides.