CN108773155B

CN108773155B - Reel-to-reel screen printing machine

Info

Publication number: CN108773155B
Application number: CN201810609061.6A
Authority: CN
Inventors: 姜浩
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-06-13
Filing date: 2018-06-13
Publication date: 2020-03-17
Anticipated expiration: 2038-06-13
Also published as: CN108773155A

Abstract

The invention provides a roll-to-roll screen printing machine, which belongs to the field of screen printing equipment and comprises a machine frame, a printing mechanism, a printing screen mechanism, a printing platform, a first deviation-correcting guide rail, a second deviation-correcting guide rail, a first slide block mechanism connected with the first deviation-correcting guide rail in a sliding manner, a second slide block mechanism connected with the second deviation-correcting guide rail in a sliding manner, a first tracking electric eye arranged at one end of the first slide block mechanism, a second tracking electric eye arranged at one end of the second slide block mechanism, a third tracking electric eye arranged in front of the machine frame and a control mechanism. According to the roll-to-roll screen printing machine, the long material edge of the thin material printing stock can be accurately found by tracking and positioning the front direction and the back direction and the first path direction through the electric eyes, the phenomenon that the material edge curls cannot occur, the positioning is accurate, the front position and the back position and the long material edge position are aligned once during each printing, the printing stock can accurately correspond to the printing screen mechanism, and the printing accuracy is guaranteed.

Description

Reel-to-reel screen printing machine

Technical Field

The invention belongs to the technical field of screen printing equipment, and particularly relates to a roll-to-roll screen printing machine.

Background

A roll-to-roll screen printing machine is an important printing device for printing rolled printing stocks, and because the rolled printing stocks can have certain position deflection in the traction printing process, a deviation correcting mechanism for guiding the unfolded printing stocks is arranged on the printing machine. The existing deviation correcting mechanism generally guides materials at the long material edge of a printing stock by arranging limiting mechanisms for deviation correction at two sides of a channel through which the printing stock passes, however, the guiding and deviation correcting mode is only suitable for the printing stock with larger hardness or larger thickness, and under the condition of printing thin printing stocks (such as plastic film printing stocks made of PET, BOPP and the like with the thickness of less than 0.05 mm), the thin printing stock has small hardness, and the long material edge is easy to curl after contacting with the limiting mechanisms, so that the long material edge cannot be positioned.

Disclosure of Invention

The invention aims to provide a roll-to-roll screen printing machine, which aims to solve the technical problem that a thin material printing stock is difficult to position in the printing process in the prior art.

In order to achieve the purpose, the invention adopts the technical scheme that: there is provided a roll-to-roll screen printing machine comprising: a frame, a printing mechanism arranged on the frame, a printing screen mechanism connected with the frame, a printing platform arranged below the printing screen mechanism, a first deviation-rectifying guide rail arranged at the front side of the printing screen mechanism and fixedly connected with the frame, a second deviation-rectifying guide rail arranged at the rear side of the printing screen mechanism and fixedly connected with the frame, a first slide block mechanism slidably connected with the first deviation-rectifying guide rail along a first path vertical to the front-back direction, a second slide block mechanism slidably connected with the second deviation-rectifying guide rail along a direction parallel to the first path, a first tracking electric eye arranged at one end of the first slide block mechanism and used for sensing the edge of a printing material, a second tracking electric eye arranged at one end of the second slide block mechanism and used for sensing the edge of the printing material, a third tracking electric eye arranged in front of the frame and used for sensing a positioning mark on the printing stock and a control mechanism, the front end of the printing screen mechanism is fixedly connected with the first sliding block mechanism, the rear end of the printing screen mechanism is fixedly connected with the second sliding block mechanism, and the control mechanism is electrically connected with the printing mechanism, the first sliding block mechanism, the second sliding block mechanism, the first tracking electric eye, the second tracking electric eye and the third tracking electric eye respectively.

Furthermore, a first groove is formed in the printing platform, and the first tracking electric eye comprises a first signal transmitting end arranged at one end of the first sliding block mechanism and a first signal receiving end arranged in the first groove; the printing platform is provided with a second groove, and the second tracking electric eye comprises a second signal transmitting end arranged at one end of the second sliding block mechanism and a second signal receiving end arranged in the second groove; the third tracking electric eye comprises a third signal end arranged in front of the frame.

Further, first track electric eye is including locating the first camera of first slider mechanism one end, the second tracks electric eye is including locating the second camera of second slider mechanism one end, the third tracks electric eye is including locating the third camera in frame the place ahead, perhaps, the third tracks electric eye is including locating the color mark sensor in frame the place ahead.

Further, the first sliding block mechanism comprises a first sliding block connected with the first deviation-rectifying guide rail in a sliding manner and a first lead screw driving unit respectively connected with the first deviation-rectifying guide rail and the first sliding block; the second sliding block mechanism comprises a second sliding block in sliding connection with the second deviation rectifying guide rail and a second lead screw driving unit respectively connected with the second deviation rectifying guide rail and the second sliding block; the first lead screw driving unit and the second lead screw driving unit are respectively electrically connected with the control mechanism.

Further, the roll-to-roll screen printing machine further comprises a negative pressure traction roller arranged in front of the third tracking electric eye, a plurality of adsorption air holes formed in the side wall of the negative pressure traction roller, a traction negative pressure air pump communicated with the inner cavity of the negative pressure traction roller and a drying mechanism arranged in front of the negative pressure traction roller, wherein the drying mechanism and the traction negative pressure air pump are respectively electrically connected with the control mechanism.

Further, a negative pressure material storing mechanism is arranged between the negative pressure traction roller and the drying mechanism; negative pressure storage mechanism is including locating negative pressure tractive cylinder front side below and the open-ended storage hopper that makes progress, locate storage hopper bottom and with the aerofoil that storage hopper bottom surface interval set up, locate aerofoil on the aerofoil, with the aerofoil with the negative-pressure air fan of space intercommunication between the storage hopper bottom surface and locating on the aerofoil and be used for the fourth of sensing stock flagging height to trace the electric eye, negative-pressure air fan with the fourth trace the electric eye respectively with the control mechanism electricity is connected.

Furthermore, the negative pressure storage mechanism also comprises a width adjusting structure which is arranged at the opening of the storage hopper and is used for contacting with the side edge of the printing stock; the width adjusting structure comprises a guide rod, an adjusting handle and an adjusting plate, wherein the guide rod is arranged in the storage hopper and is rotationally connected with the side wall of the storage hopper, the adjusting handle is arranged at the outer end of the guide rod, and the adjusting plate is sleeved on the periphery of the guide rod and is in threaded fit with the guide rod.

Further, the width of the storage hopper in the front-back direction gradually increases from top to bottom; the fourth tracking electric eye is an ultrasonic electric eye.

Further, the drying mechanism comprises a dryer body, a hot air drying assembly arranged inside the dryer body and a cold air drying assembly arranged on the front side of the hot air assembly; the cold air drying assembly comprises an air duct and an air knife which is arranged below the air duct and communicated with the inner cavity of the air duct; the air knife comprises two oppositely arranged bent plates, an air knife inner cavity is formed between the two bent plates, and the width of an air outlet of the air knife inner cavity is smaller than that of an air inlet; alternatively, the cool air drying assembly includes a cool air fan.

Further, the roll-to-roll screen printing machine further comprises a feeding mechanism arranged on the rear side of the printing platform; the feed mechanism includes the feed frame, locates raw materials roller in the feed frame, locate the material platform that connects of raw materials roller front side, locate connect a plurality of support material rollers of material platform front side, locate at least one unsteady storage roller of support material roller below, locate the storage roller position sensor in the unsteady storage roller outside, locate hold in the palm the feed in the material roller outside electric eye of rectifying a deviation, with feed rectify a deviation controller and the static elimination unit that the electric eye electricity is connected, the controller of rectifying a deviation with the feed is rectified an electric eye and is connected.

The roll-to-roll screen printing machine provided by the invention has the beneficial effects that: compared with the prior art, the relative positions of the first tracking electric eye and the second tracking electric eye and the printing screen mechanism are unchanged, the long material edge of the thin material printing stock can be accurately found by simultaneously tracking and positioning the first tracking electric eye and the printing screen mechanism in the front-back direction and the first path direction without a material clamping mode, the phenomenon of material edge curling cannot occur due to positioning, the positioning is accurate, the front-back position and the long material edge position are aligned once during each printing, the printing stock can accurately correspond to the printing screen mechanism, and the printing accuracy is ensured.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.

Fig. 1 is a schematic overall configuration diagram of a roll-to-roll screen printing machine according to an embodiment of the present invention;

fig. 2 is a left side view of an assembly structure of the frame, the printing screen mechanism, the printing platform, the first tracking electric eye, the second tracking electric eye and the third tracking electric eye in fig. 1;

FIG. 3 is a schematic view of a portion of the structure of FIG. 1;

FIG. 4 is a schematic top view of the structure of FIG. 1;

fig. 5 is a left side view of an assembled structure of the frame, the printing screen mechanism, the printing platform, the first tracking electric eye and the second tracking electric eye in fig. 2;

FIG. 6 is a left side view of the negative pressure pulling roll employed in the embodiment of the present invention;

FIG. 7 is a left structural section view of a negative pressure storage mechanism adopted in the embodiment of the invention;

FIG. 8 is a schematic top view of a negative pressure storing mechanism used in the embodiment of the invention;

FIG. 9 is a schematic structural view of an air drying assembly used in an embodiment of the present invention;

FIG. 10 is a side sectional view of a feeding mechanism according to an embodiment of the present invention;

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

fig. 12 is an assembly structural diagram of a feed correction roller, a feed adjustment screw, a nut seat and a feed adjustment motor according to an embodiment of the present invention.

Wherein, in the figures, the respective reference numerals:

1-a frame; 2-printing screen mechanism; 3-a printing platform; 4-a first deviation-rectifying guide rail; 5-a second deviation-rectifying guide rail; 6-a first slider mechanism; 601-a first slider; 602-a first lead screw drive unit; 7-a second slider mechanism; 701-a second slide block; 702-a second lead screw drive unit; 8-printing stock; 9-first tracking electric eye; 901-a first signal transmitting end; 902-a signal receiving end; 10-a second tracking electric eye; 11-third tracking electric eye; 12-a first trench; 13-negative pressure pulling roller; 14-adsorption air holes; 15-drawing a negative pressure air pump; 16-a drying mechanism; 1601-dryer body; 1602-air duct; 1603-bending plate; 0604-air knife inner cavity; 17-a storage hopper; 18-a wind plate; 19-wind holes; 20-negative pressure fan; 21-fourth tracking electric eye; 22-a guide bar; 23-adjusting the handle; 24-an adjusting plate; 25-a feed rack; 26-a stock roll; 27-a receiving table; 28-a material supporting roller; 29-floating stock roll; 30-feeding deviation rectifying electric eye; 31-a static elimination unit; 32-feed adjusting lead screw; 33-nut seats; 34-feed regulating motor

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

It will be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings that is solely for the purpose of facilitating the description and simplifying the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and is therefore not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" 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" or "second" 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 specifically defined otherwise.

Referring to fig. 1 to 5 together, a roll-to-roll screen printing machine according to the present invention will now be described. The roll-to-roll screen printing machine comprises a machine frame 1, a printing mechanism arranged on the machine frame 1, a printing screen mechanism 2 connected with the machine frame 1, a printing platform 3 arranged below the printing screen mechanism 2, a first deviation-correcting guide rail 4 arranged on the front side of the printing screen mechanism 2 and fixedly connected with the machine frame 1, a second deviation-correcting guide rail 5 arranged on the rear side of the printing screen mechanism 2 and fixedly connected with the machine frame 1, a first slide block mechanism 6 slidably connected with the first deviation-correcting guide rail 4 along a first path vertical to the front-back direction, a second slide block mechanism 7 slidably connected with the second deviation-correcting guide rail 5 along a direction parallel to the first path, a first tracking electric eye 9 arranged at one end of the first slide block mechanism 6 and used for sensing the material edge of a printing stock 8, a second tracking electric eye 10 arranged at one end of the second slide block mechanism 7 and used for sensing the material edge of the printing stock 8, a third tracking electric eye 11 arranged in front of the machine frame 1 and used for sensing a positioning mark, the front end of the printing screen mechanism 2 is fixedly connected with a first sliding block mechanism 6, the rear end of the printing screen mechanism 2 is fixedly connected with a second sliding block mechanism 7, and the control mechanism is electrically connected with the printing mechanism, the first sliding block mechanism 6, the second sliding block mechanism 7, the first tracking electric eye 9, the second tracking electric eye 10 and the third tracking electric eye 11 respectively.

Wherein, the front-back direction and the first path are both parallel to the table-board of the printing platform 3.

When the device works, the unfolded printing stock 8 enters a printing position from the rear of the printing platform 3, after the previous pattern printing is finished, the printing stock 8 is provided with not only designated printing patterns, but also positioning marks (such as patterns of lines, dots, bar codes and the like) which can be identified by the third tracking electric eye 11, the printing stock 8 moves forwards, the printed areas gradually move forwards out of the printing area of the printing platform 3, and meanwhile, the first sliding block mechanism 6 and the second sliding block mechanism 7 drive the printing screen mechanism 2, the first tracking electric eye 9 and the second tracking electric eye 10 to move outwards for a certain distance; when the third tracking electric eye 11 recognizes a positioning mark, the third tracking electric eye 11 sends a command to the control mechanism, the control mechanism controls the printing stock 8 to stop moving in the front-back direction, then the first slide block mechanism 6 and the second slide block mechanism 7 drive the printing screen mechanism 2, the first tracking electric eye 9 and the second tracking electric eye 10 to move inwards, the first tracking electric eye 9 and the second tracking electric eye 10 recognize the edge of the printing stock 8 while moving, when the first tracking electric eye 9 recognizes the edge of the printing stock 8, the control mechanism sends a command to the control mechanism, the control mechanism controls the first slide block mechanism 6 to stop moving inwards, when the second tracking electric eye 10 recognizes the edge of the printing stock 8, the control mechanism controls the second slide block mechanism 7 to stop moving inwards, and at the moment, the printing stock 8 is accurately positioned in the front-back direction and the first path direction, the position of the printed material 8 to be printed is just under the printing area of the printing screen mechanism 2, the position error is not more than 0.2mm, the control mechanism controls the printing platform 3 provided with the air holes to suck air so as to adsorb and fix the printed material 8, and the printing mechanism prints through the printing screen mechanism 2 and can complete printing again. The above process is repeated to achieve spaced printing on the substrate 8.

The first sliding block mechanism 6 and the second sliding block mechanism 7 are relatively independent transverse moving mechanisms, if the long material edge of the printed material 8 has a certain inclination relative to the edge of the printing platform (the inclination degree is small under the normal condition), the minimum distance between the first tracking electric eye 9 and the edge of the printing platform 3 after the long material edge is tracked by the second tracking electric eye 10 is different, the distance between the first sliding block mechanism 6 and the second sliding block mechanism 7 which move inwards is different, and because the front end and the rear end of the printing screen mechanism 2 are fixedly connected with the first sliding block mechanism 6 and the second sliding block mechanism 7 respectively, the printing screen mechanism 2 can generate elastic distortion deformation to a certain degree, so that the inclination degree of the printing area of the printing screen mechanism 2 is consistent with the inclination degree of the printed material 8, and the positioning accuracy is further ensured.

Compared with the prior art, the relative positions of the first tracking electric eye 9 and the second tracking electric eye 10 and the printing screen mechanism 2 are unchanged, the electric eyes are used for tracking and positioning in the front-back direction and the first path direction simultaneously, a three-point tracking mode is adopted, the long material edge of the thin material printing stock 8 can be accurately found, the phenomenon of material edge curling cannot occur due to the fact that the material is not clamped, the positioning is accurate, the front-back position and the long material edge position are aligned once during each printing, the printing stock 8 can accurately correspond to the printing screen mechanism 2, and the printing accuracy is guaranteed.

Further, as a specific embodiment of the roll-to-roll screen printing machine provided by the present invention, the printing mechanism includes a printing head disposed above the printing screen mechanism 2, the printing head includes a doctor blade and a leveling blade, the printing head can be lifted, and after the positioning of the printing screen mechanism 2 and the printing material 8 is completed, the printing head is lowered to start printing.

Further, referring to fig. 1 to fig. 5, as an embodiment of the roll-to-roll screen printing machine provided by the present invention, in order to effectively identify the edge of the printing material 8, the printing platform 3 is provided with a first groove 12, the first tracking electric eye 9, the second tracking electric eye 10 and the third tracking electric eye 11 are all photoelectric switches, the first tracking electric eye 9 includes a first signal transmitting end 901 disposed at one end of the first slider mechanism 6 and a first signal receiving end 902 disposed in the first groove 12; a second groove is formed in the printing platform 3, and the second tracking electric eye 10 comprises a second signal transmitting end arranged at one end of the second sliding block mechanism 7 and a second signal receiving end arranged in the second groove; the third tracking electric eye 11 includes a third signal terminal disposed in front of the frame 1. The moving distance of the first tracking electric eye 9 and the second tracking electric eye 10 is very small in the working process, so that the respective signal receiving ends can effectively receive signals, the respective signal receiving ends can receive the signals when the material edge of the printing stock 8 starts to be tracked, the material edge can block a part of or all the signals when the material edge is tracked, the signals cannot be completely received by the receiving ends, the signal state of the first tracking electric eye 9 or the second tracking electric eye 10 is changed, the signals are sent to the control mechanism, the control mechanism can further judge that the material edge is tracked, and the first sliding block mechanism 6 or the second sliding block mechanism 7 is controlled to stop moving.

Further, as a specific embodiment of the roll-to-roll screen printing machine provided by the present invention, the following may also be used: the first tracking electric eye 9 and the second tracking electric eye 10 are photoelectric switches, and the first tracking electric eye 9 comprises a first signal transmitting end 901 arranged at one end of the first slider mechanism 6 and a first signal receiving end 902 arranged in the first groove 12; a second groove is formed in the printing platform 3, and the second tracking electric eye 10 comprises a second signal transmitting end arranged at one end of the second sliding block mechanism 7 and a second signal receiving end arranged in the second groove; the third tracking electric eye 11 includes a third camera (i.e., a CCD electric eye) disposed in front of the frame 1, or the third tracking electric eye 11 includes a color mark sensor disposed in front of the frame 1.

The camera can directly shoot the positioning identification, and when the positioning identification moves to the designated position in the camera, the front-back direction correct alignment is judged.

Color-coded sensors refer to the detection of various labels. The wavelength is automatically adapted, and small differences in gray values can be detected, regardless of the mixed color of the label and the background. The color scale sensor is used for detecting spots on a specific color scale or an object, and color scale detection is realized by comparing with a non-color scale area instead of directly measuring the color, even if the color with slight difference of background color can be detected, and the processing speed is high.

Further, as an embodiment of the roll-to-roll screen printing machine provided by the present invention, the first tracking electric eye 9 includes a first camera provided at one end of the first slider mechanism 3, the second tracking electric eye 10 includes a second camera provided at one end of the second slider mechanism 7, and the third tracking electric eye 11 includes a third camera provided in front of the frame 1. The camera tracks the material edge image, and determines that the tracking is successful after the material edge reaches the appointed shooting area of the camera, and the control mechanism can control the first sliding block mechanism 6 or the second sliding block mechanism 7 to stop moving.

Further, referring to fig. 1 to 5, as an embodiment of the roll-to-roll screen printing machine provided by the present invention, the first slider mechanism 6 includes a first slider 601 slidably connected to the first deviation-correcting guide rail 4 and a first lead screw driving unit 602 respectively connected to the first deviation-correcting guide rail 4 and the first slider 601; the second slide block mechanism 7 comprises a second slide block 701 connected with the second deviation-rectifying guide rail 5 in a sliding manner and a second lead screw driving unit 702 respectively connected with the second deviation-rectifying guide rail 5 and the second slide block 701; the first lead screw drive unit 602 and the second lead screw drive unit 702 are electrically connected to the control mechanism, respectively. The movement of the sliding block is controlled through the lead screw mechanism, the structure is simple, the control accuracy and the movement continuity are very good, and the accurate positioning is convenient.

Specifically, the first lead screw driving unit 602 and the second lead screw driving unit 702 respectively include a motor and a lead screw, and the motor may be a stepping motor or a servo motor.

Further, referring to fig. 3, as a specific embodiment of the roll-to-roll screen printing machine provided by the present invention, in order to adjust the position of the third tracking electric eye 11, the front side of the third tracking electric eye 11 is connected to the mounting plate, the front side of the mounting plate is provided with a U-shaped clip which is opened downward, a lateral bracket is arranged below the U-shaped clip, the upper portion of the lateral bracket is located in the opening of the U-shaped clip, and the U-shaped clip is fixed on the lateral bracket through a jackscrew; guide rods penetrate through the U-shaped clamp in the front and back direction, the guide rods are in sliding fit with the U-shaped clamp, the rear end of each guide rod is fixedly connected with the mounting plate, screw rods penetrate through the U-shaped clamp in the front and back direction, the screw rods are in threaded fit with the U-shaped clamp, and the rear end of each screw rod is in rotating fit with the mounting plate. The position of the third tracking electric eye 11 can be adjusted in the front-rear direction by screwing the screw rod; by loosening the jackscrew, the position of the third tracking eye 11 can be adjusted in a direction parallel to the first path by moving the clevis on the transverse support in a direction parallel to the first path.

Further, referring to fig. 1 and fig. 6, as an embodiment of the roll-to-roll screen printing machine provided by the present invention, the roll-to-roll screen printing machine further includes a negative pressure pulling roller 13 disposed in front of the third tracking electric eye 11, a plurality of air suction holes 14 disposed on a side wall of the negative pressure pulling roller 13, a pulling negative pressure air pump 15 communicated with an inner cavity of the negative pressure pulling roller 13, and a drying mechanism 16 disposed in front of the negative pressure pulling roller 13, wherein the drying mechanism 16 and the pulling negative pressure air pump 15 are respectively electrically connected to the control mechanism. The thin material printing stock is easy to be adsorbed on a contact surface with equipment due to static electricity generated in the moving process, the thin material printing stock needs to be pulled through a pulling structure to ensure that the printing stock can smoothly enter drying equipment after printing, the traditional pulling structure generally pulls the printing stock through two rollers which are oppositely arranged, the printing stock is easy to scratch and rub the printing face which is not dried in the pulling process, and the pulling mode easily causes the deformation of the printing stock 8 in the pulling process and even pulls the printing stock 8. And this embodiment sets up the negative pressure tractive cylinder 13 that can breathe in the place ahead of printing platform 3, the adsorption affinity through the negative pressure production adsorbs the back of stock 8, and then play the effect of tractive stock 8, adsorb wind hole 14 and evenly set up around negative pressure tractive cylinder 13, the width of the negative pressure adsorption plane of negative pressure tractive cylinder 13 is not less than the width of stock 8, the adsorption area is big, can not damage the material at the in-process of pulling, can guarantee the precision of overprinting many times, and can effectively overcome electrostatic adsorption and to pulling the influence of material, it is more smooth and easy to walk the material.

Specifically, as a specific embodiment of the roll-to-roll screen printing machine provided by the present invention, the negative pressure pulling roller 13 and the pulling negative pressure air pump 15 are connected by a hose, and the hose is provided with a windless reversing suction valve.

Further, referring to fig. 1, fig. 7 and fig. 8, as an embodiment of the roll-to-roll screen printing machine provided by the present invention, a negative pressure storing mechanism is further disposed between the negative pressure pulling roller 13 and the drying mechanism 16; the negative pressure storage mechanism comprises a storage hopper 17, an air plate 18, an air hole 19, a negative pressure fan 20 and a fourth tracking electric eye 21, wherein the storage hopper 17 is arranged below the front side of the negative pressure traction roller 13 and is provided with an upward opening, the air plate 18 is arranged at the bottom of the storage hopper 17 and is arranged at an interval with the bottom surface of the storage hopper 17, the air hole 19 is arranged on the air plate 18, the negative pressure fan 20 is communicated with the space between the air plate 18 and the bottom surface of the storage hopper 17, the fourth tracking electric eye 21 is arranged on the air plate 18 and is used for sensing the drooping height of the. Negative pressure storage mechanism can adsorb flagging stock 8 downwards through negative-pressure air blower 20, the theory of operation of screen printing decides that the pulling action of stock 8 is intermittent type formula, and the drying-machine rolling is generally the continuous receipts material, negative pressure storage mechanism locates between negative pressure tractive cylinder 13 and the drying mechanism 16, mainly used plays the cushioning effect before getting into drying mechanism 16, realize intermittent type to continuous conversion, can also play the tractive effect to stock 8 on negative pressure tractive cylinder 13 simultaneously, prevent that stock 8 from pleating at negative pressure tractive cylinder 13. The fourth tracking electric eye 21 can track the sagging height of the printing stock 8 and sends a distance signal to the control mechanism in real time, when the distance between the bottom of the printing stock 8 and the air plate 18 is too low, the control mechanism judges that the material stored in the negative pressure material storage mechanism is too much, and sends a command to the drying mechanism 16 to accelerate the drying and feeding speed; when the distance between the bottom of the printing stock 8 and the air plate 18 is too high, the control mechanism judges that the material storage in the negative pressure material storage mechanism is too little, and sends a command to the drying mechanism 16 to slow down the drying feeding speed; by repeating the above processes, the drying speed can be gradually close to the printing speed in the printing process, and the debugging effect is achieved. Meanwhile, the storage hopper 17 generates suction to provide certain tension to the printing stock 8, so that the interference of electrostatic adsorption and air flow to printing materials is overcome, and the material is smoothly discharged in the printing process.

Further, referring to fig. 7 and 8, as a specific embodiment of the roll-to-roll screen printing machine provided by the present invention, the negative pressure storage mechanism further includes a width adjusting structure disposed at an opening of the storage hopper 17 and used for contacting with a side edge of the printing stock 8; the width adjusting structure comprises a guide rod 22 arranged in the storage hopper 17 and rotatably connected with the side wall of the storage hopper 17, an adjusting handle 23 arranged at the outer end of the guide rod 22 and an adjusting plate 24 sleeved on the periphery of the guide rod 22 and in threaded fit with the guide rod 22. The guide rod 22 can be a screw rod, the adjusting handle 23 is screwed, the adjusting plate 24 can move axially along the guide rod 22, the purpose of adjusting the opening feeding width of the storage hopper 17 is achieved, the guide effect is achieved on the printing stock 8, and the printing stock is prevented from being deflected in an overlarge position in the negative pressure storage mechanism.

Further, as a specific embodiment of the roll-to-roll screen printing machine provided by the present invention, in order to enhance the adsorption force, the width of the storage hopper 17 in the front-rear direction is gradually increased from top to bottom. The fourth tracking electric eye 21 is an ultrasonic electric eye which solves the problem that the prior photoelectric switch cannot reliably detect the transparent material and can accurately sense the droop height of the printing stock.

Further, referring to fig. 1 and fig. 9, as an embodiment of the roll-to-roll screen printing machine provided by the present invention, the drying mechanism 16 includes a dryer body 1601, a hot air drying component disposed inside the dryer body 1601, and a cold air drying component disposed in front of the hot air drying component; the cold air drying assembly comprises an air duct 1602 and an air knife which is arranged below the air duct 1602 and communicated with an inner cavity of the air duct 1602; the air knife comprises two oppositely arranged bending plates 1603, an air knife inner cavity 1604 is formed between the two bending plates 1603, and the width of an air outlet of the air knife inner cavity 1604 is smaller than that of an air inlet. It should be noted that the air knife inner chamber 1604 is provided with an air outlet only at a position facing the printing material 8, and is provided with an air inlet at a position adjacent to the air duct 1602, and the rest positions are closed. The air knife mode is adopted for drying, the air quantity is large, the air is uniform, and the drying is fast. Or, the cold air drying component comprises a cold air fan; alternatively, the cool air drying component can also be a natural air drying channel. The whole drying process is that the printing stock 8 is firstly dried by hot air under the traction of the winding unit, and then is dried by natural air or blown cold air in the cold air drying assembly, so that the drying effect is good, and the efficiency is high.

Further, as a specific embodiment of the roll-to-roll screen printing machine provided by the present invention, a tension control assembly for controlling the tension of the printing material 8 is disposed on the winding unit of the drying mechanism 16, the tension control assembly is electrically connected to the control mechanism, the tension control assembly can sense the tension of the printing material 8 and feed back the tension data to the control mechanism, and the control mechanism can control the winding speed according to the tension data, so as to prevent the printing material 8 from being deformed due to too much tension or the printing material 8 from being too little tension affecting the drying effect of the printing material 8.

Specifically, the tension control assembly may be a pressure sensor disposed on a winding roller of the winding unit, and when the tension of the printing material 8 is too large, the pressure value sensed by the pressure sensor increases, and when the tension of the printing material 8 is too small, the pressure value sensed by the pressure sensor decreases.

Specifically, as a specific embodiment of the roll-to-roll screen printing machine provided by the present invention, the drying mechanism further includes a drying deviation rectifying structure disposed below the front side of the dryer body 1601, the drying deviation rectifying structure includes a drying deviation rectifying roller disposed below the front side of the dryer body, a deviation rectifying turntable disposed below the drying deviation rectifying roller and having two sides rotatably connected to two ends of the drying deviation rectifying roller, a drying deviation rectifying motor for driving the deviation rectifying turntable to swing, an arc-shaped limiting groove disposed on the deviation rectifying turntable, a limiting guide rod penetrating through the arc-shaped limiting groove and fixedly connected to the dryer body, and two drying deviation rectifying tracking electric eyes disposed on two side surfaces of the drying deviation rectifying roller, wherein a swing center of the deviation rectifying turntable is located behind the drying deviation rectifying roller. The stoving structure of rectifying is generally used for the tensioning stock 8 that has already passed through the stoving, for example, if left stoving is rectified and is tracked the left side that the electric eye sensing was close to the stoving roller of rectifying to the material limit of one side of stock 8 too, then the stoving motor drive of rectifying swings right, and the tension that the stock 8 left and right sides received is different, finally can get back to the intermediate position of stoving roller of rectifying.

Further, referring to fig. 1, 10 to 12, as an embodiment of the roll-to-roll screen printing machine provided by the present invention, the roll-to-roll screen printing machine further includes a feeding mechanism disposed at the rear side of the printing platform; the feeding mechanism comprises a feeding rack 25, a material roller 26 arranged on the feeding rack 25, a material receiving platform 27 arranged on the front side of the material roller 26, a plurality of material supporting rollers 28 arranged on the front side of the material receiving platform 27, at least one floating material storage roller 29 arranged below the material supporting rollers 28, a material storage roller position sensor arranged on the outer side of the floating material storage roller 29, a feeding deviation rectifying electric eye 30 arranged on the outer side of the material supporting rollers 28, a deviation rectifying controller electrically connected with the feeding deviation rectifying electric eye 30 and an electrostatic eliminating unit 31 arranged on the front side of the feeding deviation rectifying electric eye on the feeding rack 25, wherein the deviation rectifying controller is electrically connected with the feeding deviation rectifying electric eye 30. The magazine roller position sensor may sense the flying height of the floating magazine roller 29.

Specifically, the feeding mechanism further comprises a feeding adjusting screw 32 rotatably connected with the feeding frame 25, a nut seat 33 sleeved on the feeding adjusting screw 32 and rotatably connected with the center shaft of the raw material roller 26, and a feeding adjusting motor 34 connected with the feeding adjusting screw 32, wherein the feeding adjusting motor 34 is electrically connected with the deviation correction controller. The feeding deviation-rectifying electric eye 30 senses a signal of the position of the printing stock 8 in real time and feeds the signal back to the deviation-rectifying controller, and the feeding adjusting motor 34 is used for controlling the adjusting screw rod 32 to rotate according to a command of the deviation-rectifying controller so as to drive the nut seat 33 to transversely move, and finally, the raw material roller 26 synchronously and transversely moves, so that the feeding deviation-rectifying effect is achieved, the structure is simple, and the use is convenient.

By providing the static electricity eliminating unit 31, the feeding mechanism can remove static electricity of the material while automatically discharging the printing material under the control of the control mechanism, thereby achieving the effect of eliminating static electricity of the material before printing. Meanwhile, the feeding deviation-correcting electric eye 30 can sense whether the position of the printing stock 8 is deviated or not, and further can control the left and right movement of the raw material roller 26 by controlling the rotation direction of the feeding adjusting motor 34, so that the purpose of feeding deviation correction is achieved. The floating storage roller 29 plays a role in temporarily storing the printing stock 8, the feeding speed and the printing speed of the feeding mechanism can be balanced, the floating storage roller 29 can move up and down under the control of the control mechanism, and meanwhile, air is blown outwards, so that a certain distance is kept between the upper surface of the printing stock 8 and the outer surface of the floating storage roller 29 all the time, and printing ink is prevented from being scratched. Specifically, the floating stock roller 29 is lowered when the printing speed is slightly slow, and the stock amount of the stock mechanism can be slightly increased within a certain time to reduce the stock speed; on the contrary, when the printing speed is slightly fast, the floating storage roller 29 rises, the storage amount of the feeding mechanism can be slightly reduced within a certain time, so that the feeding speed is increased, and finally the feeding speed can be adapted to the printing speed through the lifting adjustment for several times.

Further, referring to fig. 10, as an embodiment of the roll-to-roll screen printing machine provided by the present invention, a plurality of transition feeding rollers are further disposed at the front side of the feeding mechanism, and the printing material 8 is staggered between the plurality of transition feeding rollers to ensure the tension of the printing material 8.

Specifically, to reduce the difficulty of installation and reduce the cost of use, the control mechanism may be a Programmable Logic Controller (PLC).

The overall working process is as follows:

the feeding mechanism discharges the printing stock 8 under the control of the control mechanism, the printing stock 8 can be temporarily stored in the feeding mechanism under the action of the floating stock roller 29, after the previous pattern is printed, the printing stock 8 moves forwards, when the third tracking electric eye 11 identifies the positioning mark, the third tracking electric eye 11 sends a command to the control mechanism, the control mechanism controls the printing stock 8 to stop moving in the front-back direction, then, the first slider mechanism 6 and the second slider mechanism 7 drive the printing screen mechanism 2, the first tracking electric eye 9 and the second tracking electric eye 10 to move inwards, the first tracking electric eye 9 and the second tracking electric eye 10 identify the edge of the printing stock 8 while moving, when the first tracking electric eye 9 identifies the edge of the printing stock 8, the command is sent to the control mechanism, the control mechanism controls the first slider mechanism 6 to stop moving inwards, when the second tracking electric eye 10 identifies the edge of the printing stock 8, the command is sent to the control mechanism, the control mechanism controls the second sliding block mechanism 7 to stop moving inwards, the position to be printed of the printed material 8 is just under the printing area of the printing screen mechanism 2, the printing platform 3 sucks air to fix the printed material 8, and the printing mechanism and the printing screen mechanism 2 start printing, so that continuous printing is realized in a circulating mode. After printing is finished, the printing stock 8 is pulled by the negative pressure pulling roller 13 and sent to the storage hopper 17, the fourth tracking electric eye 21 in the storage hopper 17 senses the droop height of the printing stock 8 and feeds back the droop height information of the material to the control mechanism, and the control mechanism informs the drying mechanism 16 to wind the printing stock in a state close to a constant speed through operation.

The arrangement of the storage hopper 17 realizes the operation state of constant-speed winding of the intermittent printing and feeding oven of the printing machine; the thin material printing stock is easy to generate electrostatic adsorption in the moving process and is also easy to be influenced by air flow, the floating material storage roller 29 in the feeding mechanism overcomes the influence of the static electricity and the air flow on the material in the operation of the printing stock 8, the feeding deviation rectifying electric eye 30 realizes automatic deviation rectifying and discharging and real-time material position correction, the influence on material feeding due to uneven material, static electricity, friction and the like is reduced, and the stable operation of the printing stock 8 is ensured; the material pulling of the printing screen mechanism 2 is carried out by pushing, the material pulling is carried out by pulling, and the material inspecting is carried out by positioning and printing, so that the relative position of the printing screen mechanism 2 and the material edge of a printing stock 8 is accurate, the third tracking electric eye 11 tracks, the marking is found and positioned every time the material is pulled, so that the material pulling step distance is accurate, and the first tracking electric eye 9, the second tracking electric eye 10 and the third tracking electric eye 11 realize three-point positioning to ensure the printing precision; drying mechanism 16 is dry can adopt the air knife drying, and is even high-efficient, and drying mechanism 16 adopts snail formula to walk the material mode, can store tens meters stock 8 in the drying-machine body 1601, practices thrift the space, also can adopt UV drying microwave, medium wave drying according to printing technology, and the controllable stock 8 tension of tension control subassembly reaches even rolling and the neat effect of rolling.

Generally, a printing machine can only print a single color, when multicolor printing is required, each printing machine corresponds to different printing colors by repeatedly arranging the roll-to-roll screen printing machines, and meanwhile, only the rear end of the first color printing machine comprises a feeding mechanism. The printing machine with the repeated arrangement forms a multicolor printing system, has one color and one correction, reasonable spatial layout, accurate printing positioning, ensured overprinting precision, no scraping of printed patterns and good printing quality.

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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. Reel-to-reel screen printing machine, its characterized in that: comprises a frame, a printing mechanism arranged on the frame, a printing screen mechanism connected with the frame, a printing platform arranged below the printing screen mechanism, a first deviation-rectifying guide rail arranged at the front side of the printing screen mechanism and fixedly connected with the frame, a second deviation-rectifying guide rail arranged at the rear side of the printing screen mechanism and fixedly connected with the frame, a first slide block mechanism in sliding connection with the first deviation-rectifying guide rail along a first path vertical to the front-back direction, a second slide block mechanism in sliding connection with the second deviation-rectifying guide rail along a direction parallel to the first path, a first tracking electric eye arranged at one end of the first slide block mechanism and used for sensing the edge of a printing material, a second tracking electric eye arranged at one end of the second slide block mechanism and used for sensing the edge of the printing material, a third tracking electric eye arranged in front of the frame and used for sensing a positioning mark on the printing stock and a control mechanism, the front end of the printing screen mechanism is fixedly connected with the first sliding block mechanism, the rear end of the printing screen mechanism is fixedly connected with the second sliding block mechanism, and the control mechanism is electrically connected with the printing mechanism, the first sliding block mechanism, the second sliding block mechanism, the first tracking electric eye, the second tracking electric eye and the third tracking electric eye respectively;

the roll-to-roll screen printing machine further comprises a negative-pressure traction roller arranged in front of the third tracking electric eye, a plurality of adsorption air holes arranged on the side wall of the negative-pressure traction roller, a traction negative-pressure air pump communicated with the inner cavity of the negative-pressure traction roller and a drying mechanism arranged in front of the negative-pressure traction roller, wherein the drying mechanism and the traction negative-pressure air pump are respectively and electrically connected with the control mechanism;

a negative-pressure material storing mechanism is also arranged between the negative-pressure traction roller and the drying mechanism; negative pressure storage mechanism is including locating negative pressure tractive cylinder front side below and the open-ended storage hopper that makes progress, locate storage hopper bottom and with the aerofoil that storage hopper bottom surface interval set up, locate aerofoil on the aerofoil, with the aerofoil with the negative-pressure air fan of space intercommunication between the storage hopper bottom surface and locating on the aerofoil and be used for the fourth of sensing stock flagging height to trace the electric eye, negative-pressure air fan with the fourth trace the electric eye respectively with the control mechanism electricity is connected.

2. The roll-to-roll screen printing machine according to claim 1, wherein: the printing platform is provided with a first groove, and the first tracking electric eye comprises a first signal transmitting end arranged at one end of the first sliding block mechanism and a first signal receiving end arranged in the first groove; the printing platform is provided with a second groove, and the second tracking electric eye comprises a second signal transmitting end arranged at one end of the second sliding block mechanism and a second signal receiving end arranged in the second groove; the third tracking electric eye comprises a third signal end arranged in front of the frame.

3. The roll-to-roll screen printing machine according to claim 1, wherein: first track the electric eye including locating the first camera of first slider mechanism one end, the electric eye is tracked including locating to the second camera of second slider mechanism one end, the electric eye is tracked including locating to the third camera in frame the place ahead, perhaps, the electric eye is tracked including locating to the third color mark sensor in frame the place ahead.

4. The roll-to-roll screen printing machine according to claim 1, wherein: the first sliding block mechanism comprises a first sliding block in sliding connection with the first deviation-rectifying guide rail and a first lead screw driving unit respectively connected with the first deviation-rectifying guide rail and the first sliding block; the second sliding block mechanism comprises a second sliding block in sliding connection with the second deviation rectifying guide rail and a second lead screw driving unit respectively connected with the second deviation rectifying guide rail and the second sliding block; the first lead screw driving unit and the second lead screw driving unit are respectively electrically connected with the control mechanism.

5. The roll-to-roll screen printing machine according to claim 1, wherein: the negative pressure storage mechanism also comprises a width adjusting structure which is arranged at the opening of the storage hopper and is used for contacting with the side edge of a printing stock; the width adjusting structure comprises a guide rod, an adjusting handle and an adjusting plate, wherein the guide rod is arranged in the storage hopper and is rotationally connected with the side wall of the storage hopper, the adjusting handle is arranged at the outer end of the guide rod, and the adjusting plate is sleeved on the periphery of the guide rod and is in threaded fit with the guide rod.

6. The roll-to-roll screen printing machine according to claim 1, wherein: the width of the storage hopper in the front-back direction is gradually increased from top to bottom; the fourth tracking electric eye is an ultrasonic electric eye.

7. The roll-to-roll screen printing machine according to claim 1, wherein: the drying mechanism comprises a dryer body, a hot air drying assembly arranged in the dryer body and a cold air drying assembly arranged on the front side of the hot air assembly; the cold air drying assembly comprises an air duct and an air knife which is arranged below the air duct and communicated with the inner cavity of the air duct; the air knife comprises two oppositely arranged bent plates, an air knife inner cavity is formed between the two bent plates, and the width of an air outlet of the air knife inner cavity is smaller than that of an air inlet; alternatively, the cool air drying assembly includes a cool air fan.

8. The roll-to-roll screen printing machine according to claim 1, wherein: the roll-to-roll screen printing machine further comprises a feeding mechanism arranged on the rear side of the printing platform; the feed mechanism includes the feed frame, locates raw materials roller in the feed frame, locate the material platform that connects of raw materials roller front side, locate connect a plurality of support material rollers of material platform front side, locate at least one unsteady storage roller of support material roller below, locate the storage roller position sensor in the unsteady storage roller outside, locate support the feed in the material roller outside electric eye of rectifying a deviation, with feed rectify a deviation controller and the static elimination unit that the electric eye is connected, the controller of rectifying a deviation is connected with the feed electricity of rectifying a deviation.