CN211968794U

CN211968794U - Screen printing conveyor and use device's sheet-fed screen printing machine

Info

Publication number: CN211968794U
Application number: CN202020172390.1U
Authority: CN
Inventors: 张永胜
Original assignee: Shijiazhuang Shenghui Machinery Technology Co ltd
Current assignee: Shijiazhuang Shenghui Machinery Technology Co ltd
Priority date: 2019-08-28
Filing date: 2020-02-16
Publication date: 2020-11-20
Anticipated expiration: 2030-02-16
Also published as: CN111114104A

Abstract

A screen printing conveying device and a sheet-fed screen printing machine using the same are disclosed, the screen printing conveying device comprises a circulating belt 6 rotating along the surface of a printing platform 3, the circulating belt 6 is provided with an air suction hole 5 for absorbing a printing stock, one part of the circulating belt 6 is arranged along the printing platform 3 and a material receiving platform 7 in a parallel attaching manner, and the printing platform 3 is provided with a plurality of rows of air suction ports 23 corresponding to the positions of the air suction holes 5; the circulating belt 6 is provided with a limiting and correcting device; the circulating belt 6 is driven by a motor or a cylinder for controlling the stepping length of the circulating belt 6; the circulating belt 6 corresponds to three stations, namely a material receiving station 17, a printing station 4 and a discharging station 18 according to the longitudinal advancing direction of the printing stock. The utility model discloses a circulation area synchronous conveyor of printed matter/stock, and the stock gets into next stock after the printing station and can fix a position, has effectively avoided the work efficiency loss, has improved screen printing efficiency.

Description

Screen printing conveyor and use device's sheet-fed screen printing machine

Technical Field

The utility model belongs to the technical field of screen printing machine technique and specifically relates to a screen printing conveyor of unloading in step is gone up in circulatory zone is related to, still relates to the sheet-fed screen printing machine who has this conveyor. Wherein the synchronous feeding and discharging of the circulating belt means that:

the former printing stock/printed matter is still positioned at the printing station, and the latter printing stock can enter the material receiving station and be positioned; then the circulating belt rotates for a certain distance, the printed matter enters a discharging station, and then a printing stock enters a printing station.

Background

The screen printing machine is a mature product, and is used as one of the structural forms, namely a sheet-fed flat screen printing machine, and comprises a printing platform (used for bearing a printing stock), a printing head (a screen printing plate is arranged on the printing head, a scraping blade and a returning blade are arranged above the screen printing plate), and a printing station is arranged on the printing platform corresponding to the printing head.

At present, the most main structural forms of the sheet-fed flatbed screen printing machine include a fixed type and a turnover type. Fixed screen printing machine is the normal printing working process in, and printing platform is fixed, and the printing head goes up and down to realize opening and shutting, prints behind printing head and printing platform lock, and printing head and printing platform open to have certain clearance, and the stock is placed the position (printing station promptly) that corresponds with the printing head on the printing platform. When printing is started, the printing head and the ink scraping cutter head descend to contact with the silk screen plate, and the ink scraping cutter of the printing head presses to start printing. After printing is finished, the printing head is lifted, and the printing head and the printing platform are separated by a certain distance so as to take out the printed matter. The printing platform of a fixed screen printing machine and the screen printing plate of a printing head are generally in a horizontal state, and the positioning of a printed matter is generally completed by pulling the printed matter through a pull gauge, a push gauge and the like.

The fixation of the printing stock on the printing station is realized by generating negative pressure air suction through the air suction holes on the upper surface flat plate of the printing platform. The structure of the air suction channel connected with the air suction hole in the printing platform is disclosed in patent documents such as CN208515197U, and the like, and a plurality of air suction openings are arranged on the top plate of a box-shaped platform, so that an object to be printed is flatly adsorbed.

The turnover screen printing machine comprises an upper turnover type screen printing machine and a lower turnover screen printing machine. The printing head is kept fixed, and the printing platform swings up and down relative to the printing head in a downward turning mode; the printing platform is kept fixed, and the printing head can swing up and down around a shaft or move up and down linearly and is of an upturning type. One of the purposes of relative movement or relative oscillatory flipping between the print heads or stages, whether it be an up-or down-turning screen printer, is to move the print heads or stages away from the printing stage in order to exchange printed matter and to clean the screen of the print heads (wipe).

Convertible screen printing machine all needs to fix a position waiting to print article (stock) on printing station (printing platform), and positioner's structural style adopts the location dog mostly, and a small number adopts structures such as longitudinal positioning draw the rule, push away rule, CCD image location, or location manipulator. After the positioning is finished, the printing platform fixes the printed matter through negative pressure air suction, the printing platform is buckled with the printing head to start printing, and the printing platform blows air or does not suck air when the ink return is finished so as to be beneficial to taking out the printed matter; such machines require 5 actions to carry out the process of exchanging the printing material (printed matter), namely: 1) the lower flip print platform is lowered (or the print head is flipped up); 2) placing a mechanical arm into a printing stock, 3) positioning a printed matter, 4) leaving a printing area by the mechanical arm, and 5) turning over the printing platform to buckle. The printing head only has two actions of ink returning and ink scraping (which are useful actions in the printing process), the ink returning action is fast, the printing head is stopped to wait for exchanging printing stocks, so the printing speed is slow, and the plate is easy to dry when the quick-drying ink is used, and the plate needs to be repeatedly wiped (dry plate means that some quick-drying ink is dried and solidified at the edge of a silk screen plate in the printing process when the printing speed of a silk screen printer is slow, so the printing quality is influenced, so when the quick-drying ink is used, the plate needs to be frequently wiped, the plate needs to be wiped for many times per shift, namely, time and materials are wasted).

The printing platform of the turnover printing machine is driven by a motor, and in order to improve the production efficiency, the opening and closing speed is very high, so that the accident that an operator is injured by clamping can occur when the operator violates rules or the machine fails.

In order to match the transmission of printing stocks, a paper (material) feeding machine and a blanking mechanism can be arranged on the side of the printing platform of each single-sheet screen printing host machine. The feeder, which functions to automatically feed the printing material to the printing platform, is basically constructed with a storage table, a sheet separating mechanism, and a printing material transport mechanism, usually a robot, which transfers the printing material from the storage table of the feeder to the printing station. The blanking mechanism in the prior art is generally a mechanical arm with a clamp or a sucker, and the clamping, the sucking and the releasing of a printed matter can be completed through a mechanical or electro-pneumatic mechanism, so that printed pictures and texts cannot be printed in the edge area of the printed matter, and a blank of 5-10 mm is generally reserved on the edge of the printed matter (when the mechanical arm contacts the printed pattern without drying, the printed pattern is damaged), so that the generation of printing defective products is avoided. And a blanking output device (such as a conveying belt) or a drying device (such as a drying channel) is arranged at the position, corresponding to the blanking mechanism, on the other side of the printing platform and is used for receiving printed matters reaching the discharging station.

Chinese patent document CN201620104120.0 discloses an automatic oblique feeding screen printing machine, CN201821106409.1 discloses a high precision screen printing machine, CN201620104118.3 discloses an automatic oblique positioning screen printing machine, and CN201721582021.4 discloses an automatic positioning printing platform mechanism. In the solutions of these documents, the positioning of the printing material on the printing station is performed automatically by the weight of the printed product. The printing head is fixedly arranged on a frame, a printing platform is hinged with the frame or the printing head, a swinging connecting rod mechanism connected with the printing platform is arranged on the frame, the swinging connecting rod mechanism enables the printing platform to swing up and down relative to the printing head, and the table top of the printing platform is in an inclined state after the printing platform swings down. The printing platform and the printing head can swing up and down once every time of printing, so that one-time opening and closing is realized. The upper surface of the printing platform is provided with two groups of longitudinal and transverse positioning pins capable of automatically extending out and retracting, when the printing platform swings to be opened relative to the printing head, the printing platform inclines downwards, and a printing stock is placed on the printing platform, the printing stock slides along the upper surface of the inclined printing platform under the action of gravity, and when the printing stock touches the longitudinal and transverse positioning pins, the positioning of two edges of the printing stock is completed. And then, the air suction opening on the printing platform is used for sucking the printing stock to start printing.

Firstly, from the viewpoint of production efficiency, although the screen printing machine of the above patent technology realizes automatic positioning of the printing stock at the printing station, and reduces labor intensity, the feeding mechanical arm and the discharging mechanical arm (printed matter conveying device) for feeding and discharging at the printing station are respectively arranged on the frame, the mechanical arm needs to be kept at the same height as the printed matter or at a fixed position to clamp the printed matter, that is, only when the printing platform is lowered to the lowest position, the mechanical arm can enter the printing station between the printing platform and the printing head to put in or take out the printed matter, and only when the feeding mechanical arm reversely moves out of the range of the printing platform from between the printing platform and the printing head, the printing platform can be lifted, otherwise, the platform and the mechanical arm collide. Therefore, in the existing screen printing machine, the printing platform cannot lift when the feeding mechanical arm and the discharging mechanical arm work, namely the printing platform needs to stand for a certain time after swinging downwards to a designated position (the lowest position) so as to finish feeding and discharging actions and replacement of printed matters. Therefore, the opening and closing process of the printing platform and the printing head is only the exchange of the printed matters and the positioning of the printed matters, and is an ineffective working process of the printing machine, so that the waste of production time is caused, and the production efficiency is reduced. Thus, although the automatic positioning is realized by the prior sheet-fed flat-bed flat screen printing machine, the printing speed can not exceed 900 sheets/hour (the printing area is 50 multiplied by 70 cm).

Secondly, from the working procedure, the printed matter of the screen printing machine can automatically slide out when moving out of the printing station to the discharging station (printed matter discharging) or the printed matter can be clamped by the discharging mechanical arm and moved out of the printing station to the discharging station. When the material clamping mechanical arm is adopted (two clamps clamp a mode of printing on one side), the material clamping mechanical arm can clamp some special materials, if the clamp is used for clamping a thin aluminum plate, the self weight of the aluminum plate is large, the clamp and the aluminum plate can deform at the contact position, if the clamp is used for clamping the material coated with a special coating, the coating can be clamped, and the printing on the side from a printing graph can not be clamped. And when the manipulator clamp is used for clamping the printed matter, the printing platform and the printing head are opened firstly, then the clamp enters the printing area to clamp the printed matter, and then the printed matter is pulled out of the printing area, so that the operation steps are multiple, the required time is long, and the speed of exchanging the printed matter is low. To the printed matter of automatic roll-off during the slope, because inhale through the negative pressure and fix the absorption on printing platform with the printed matter, consequently, can automatic roll-off from the printing platform after the slope for the printed matter, at first will adsorb the air in the printing platform of printed matter and switch into the malleation by the negative pressure, blow up the printed matter, the printed matter can only be on the printing platform of slope automatic roll-off, so adopt the unloading mode of self roll-off, the roll-off speed is relatively slow, the time spent is longer, and because by the unstable or uneven printed matter of negative pressure to malleation conversion process air current, cause the frictional force between printed matter and the printing platform different, the printed matter landing process is often crooked, block in drying equipment, can not arrange neatly when arriving unloading output device, need manual work to arrange in order.

SUMMERY OF THE UTILITY MODEL

For solving the defect that exists among the above-mentioned prior art, the utility model aims at providing a sola screen printing's synchronous conveyor still provides the screen printing machine who adopts this synchronous conveyor, makes on the stock can carry printing platform sooner, and the printed matter shifts out the printing station simultaneously, has avoided the pause of print head in order to improve printing efficiency, has avoided the accident that presss from both sides and hinders the operative employee.

In order to solve the technical problem, the utility model discloses the technical scheme who adopts is: a screen printing conveyor, conveyor includes along the endless belt 6 of printing platform 3 surface rotation, and endless belt 6 is opened there is the hole 5 that induced drafts that adsorbs the stock, its characterized in that: a part of the circulating belt 6 is arranged along the printing platform 3 and the material receiving platform 7 in a parallel attaching mode, and a plurality of rows of printing station air suction openings 23 corresponding to the positions of the air suction holes 5 are formed in the printing platform 3; the circulating belt 6 is provided with a limiting and correcting device; the circulating belt 6 is driven by a motor or a cylinder for controlling the stepping length of the circulating belt 6; the circulating belt 6 corresponds to three stations, and is respectively a material receiving station 17, a printing station 4 and a discharging station 18 according to the longitudinal advancing direction of a printing stock; the conveying device is a synchronous conveying device, and means that one stepping distance of the circulating belt 6 completes the switching of the stations where the printing stocks are located and/or the switching of the printed matters and the stations where the printing stocks are located; the printing material is a shape-fixed and air-impermeable printing material. The printing stock can be paper, metal plate, PET film, various plastic plates, etc. The printing and conveying device utilizes the circulating belt for fixing the printing stock by sucking air under negative pressure to feed and discharge materials to the printing station, the circulating belt is provided with the material receiving station, the printing station and the material discharging station, the circulating belt is connected to the printing platform and rotates around the printing platform and the material receiving platform in a circulating mode, and feeding and discharging can be carried out simultaneously. The material receiving station and the printing station are positioned on the circulating belt, the circulating belt supports a printing stock/printed matter to directly complete printing on the circulating belt, the printing platform and the printing head can exchange the printing stock by utilizing a gap between the screen printing plate and the printing stock without swinging or moving away for a certain distance (when the printing head returns ink, the ink returning knife is lifted by the ink scraping knife and falls down, the position of the ink returning knife falls is high, at the moment, the screen printing plate is not bounced by the pressure of the ink scraping knife to leave the printed matter to generate the gap), the printing platform can not be opened and closed any more during printing, and the problem that operators are injured by clamping. After the ink scraping section finishes printing operation, the printing head returns ink, the circulating belt can rotate to realize one-step stepping to finish the exchange of printing stocks, the printing head does not need to wait and can scrape ink immediately for printing, and the next printing stock enters the material receiving station and finishes positioning at the material receiving station simultaneously when scraping ink. The whole operation process is free of idle time of opening and closing of the printing platform, positioning of the printing stock, jacking of the printing stock, clamping of the printing stock and returning of the feeding manipulator, printed matter is directly and synchronously exchanged, the printing stock is positioned and moved to the material receiving station, and the printing speed is greatly improved when the printing stock is printed with ink scraping. The anterior correspondence of circulatory system connects the material station for connect and get the stock that the paper feeder transmission comes, the rear portion corresponds the printing station in the circulatory system, and circulatory system rear end and pivot department correspond ejection of compact station, and the circulatory system utilizes the clearance of silk screen board and print platform to rotate, and the printed matter that will print and accomplish shifts out simultaneously takes the stock to the printing station, consequently the utility model discloses a print platform can needn't swing, and when printing, print head, print platform (connect the material platform can be split type design or integral type design with print platform) can also can be for the one-way tilt state for the horizontality. The circulating belt is driven by a stepping motor or a servo motor to rotate in a stepping mode, the stepping distance of each rotation is the distance or 1/2 distance of a printed material moving from the material receiving station to the printing station (namely the printed material arrives at the printing station from two stepping actions of the material receiving station, and the mode of the two steps arriving at the printing station from the integral circulating belt is still the stepping distance of the circulating belt (6) to complete the switching of the stations where the printed material is located, namely a station to be printed is added between the material receiving station and the printing station), the positioning pin of the material receiving station can move, the stepping distance can be adjusted and set from a control part of a touch screen, so that printed matters with different sizes can be stopped at the central position of the printing platform to be printed, and the problem of inconsistent ink thickness caused by positioning the printed material close to one side is solved (the positioning pin is, the positioning pins are arranged at the edge of the printing platform, and the printing cutter of the printer deflects to one side when printing a small printing stock, so that the pressures on two sides are unequal, and the ink thickness is inconsistent due to unequal pressures).

And a positioning device for limiting the printing stock is arranged at the material receiving station 17 and/or the printing station 4. The positioning device is arranged at the material receiving station or the printing station, printing can be completed without re-connection after the printing stock is positioned, and the positioning precision is improved.

The material receiving platform 7 is also provided with a material receiving station air suction opening 22 corresponding to the position of the air suction hole 5, and the material receiving station air suction opening 22 is connected to a material receiving station air suction system through a material receiving station air suction valve 60; the printing station air suction opening 23 of the printing platform is connected to the printing station air suction system through a printing station air suction valve 70. The two air suction systems can share one fan or two fans. The circulating belt moves along the surfaces of the printing platform and the material receiving platform, the circulating belt is provided with air suction holes 5 communicated with air suction ports arranged on the printing platform and the material receiving platform correspondingly, printing station air suction ports 23 arranged on the printing platform 3 are a plurality of rows of air suction holes, the air suction holes are arranged in parallel and correspondingly to the motion direction of the circulating belt 6, namely, an air port 5 arranged on the circulating belt is communicated with printing station air suction ports 23 arranged on the printing platform 3 in a one-to-one correspondence way in the circulating operation direction, the printing station air suction ports 23 on the printing platform are usually arranged in a long groove shape, so that the circulating belt can be stopped at any position to ensure that the circulating belt air suction holes 5 are communicated with the printing station air suction ports 23 on the printing platform 3, an air suction channel in the material receiving platform has the same principle with the printing platform and can be arranged at a lower density, and negative pressure, on the stock adsorbs the circulating band, because adopt the negative pressure to adsorb the stock, be different from the adhesive bonding adsorption mode of rubber coating and can not cause stained (glue can remain in the printed matter bottom surface, paper printed matter also can be glued by glue) this department and connect the induced draft difference of material station and printing station, the material that corresponds connects the material station air suction system is two way independent air suction systems with the printing station air suction system that corresponds the printing station, can be through the control of PLC and pneumatic valve, make connect material station and printing station to produce not the wind pressure of equidimension and different induced draft time. During printing, the printing station generates large negative pressure air draft to adsorb and fix the printed matter so that the printed matter cannot move. During printing, the paper feeder sends the printing stock to the receiving station, the printing stock is positioned at the receiving station, at the moment, the receiving station does not suck or blow air, the receiving station is positioned, and the receiving station air suction valve 60 is switched to suck the printing stock. The positioning of the material receiving station is also completed after the printing is completed, the circulating belt adsorbs printing materials to operate, the printing materials move to the printing station from the material receiving station, the material receiving station and the printing station are both small negative pressure air suction in the moving process, the printing materials are always in an adsorbed state, and the position cannot be changed in the conveying process. If the mode of positioning the printing stock at the printing station is adopted, the printing station blows air when the printed matter reaches the printing station, and thus the positioning can be completed under the condition of no resistance.

The circulating belt 6 is a rigid belt with the thickness of 0.1-0.5 mm or a flat belt with the thickness of 0.5-5 mm; the circulating belt is also provided with a plurality of clamping edge positioning blocks or positioning rotating shafts for limiting the moving track of the circulating belt. Where the upper half of the endless belt 6 is in tension. The rigid belt is made of stainless steel material, carbon steel, manganese steel, aluminum alloy and the like, preferably stainless steel, the self weight of the circulating belt is lighter due to the fact that the stainless steel is thin, the strength is higher, and the running and printing precision of the rigid belt made of the stainless steel material is higher than that of a flat belt. Two ends of the circulating belt 6 can be provided with a driving shaft and a driven shaft of the circulating belt, so that the circulating belt is driven to rotate circularly. The two circulating belt driving shafts 11 can both rotate actively, the two circulating belt driving shafts 11 are connected through a synchronous belt 22 (certainly, the two circulating belt driving shafts can be connected through a gear, a chain and the like), the diameter of the circulating belt driving shaft at the front end in the running direction is slightly larger than that of the circulating belt driving shaft at the rear end, the circulating belt is in a tensioning state in the running process, and particularly, rubber layers such as rubber, polyurethane or silica gel are coated on the surface of the circulating belt driving shaft to increase the friction force between the circulating belt and the circulating belt. Edge clamping positioning blocks can be further arranged on the upper surfaces of the printing platform and the material receiving platform and at the edge positions corresponding to the circulating belt 6, one or more pairs of edge clamping positioning blocks can be arranged along the rotating direction of the circulating belt 6, and the edge clamping positioning blocks tightly clamp the two sides of the circulating belt 6 so that the circulating belt cannot swing left and right; the two sides of the lower half circle of the circulating belt 6 in the rotating direction are provided with one or more groups of clamping wheels or positioning shafts with steps, or a limiting blocking sleeve is arranged on a driving shaft 11 to limit the moving track of the circulating belt, the lower half circle of clamping edge positioning wheels tightly clamp the two sides of the circulating belt 6, a group of clamping shafts are arranged above and below the circulating belt beside the clamping wheels to keep the thin circulating belt straight, and the mechanical precision of the circulating belt is very high.

The person skilled in the art considers that the stainless steel belt (i.e. endless belt) of the prior art does not meet the printing accuracy requirements for at least 3 reasons; 1) the running direction of the circulating belt can not meet the requirement of screen printing due to driving precision or inertial slip when the circulating belt runs at high speed; 2) the problems that the offset of a circulating belt is large, the overprinting is inaccurate, the air suction conduction of a printing platform is blocked, the printing cannot be realized, the straightness is not enough to be more than 2mm when a common stainless steel belt or a flat belt (the circulating belt needs to be unfolded for 3 meters) runs, the running straightness is not enough (the straightness of the edge of the circulating belt and the verticality of the edge and the circumference of the circulating belt influence the running straightness), the left-right offset can be generated when the stainless steel belt or the flat belt runs, the overprinting of a printed matter is required to be usually less than o.1mm (considering that a silk screen plate and the printed matter are inevitably deformed during printing, the circulating belt cannot be left-right offset), the silk screen printing can be realized only by using a scraper with larger pressure, the printing platform sucks air to fix the printed matter so as to prevent the silk screen from rebounding and sticking and moving the printed matter, the air suction opening of the printing platform is large, the printing platform 3 supports the circulating belt, so that the air suction opening 23 of the printing station can not be large in the same way, the left and right deflection of the circulating belt affects overprinting and air suction, the blocked suction force of air suction conduction is insufficient, the silk screen plate can not be separated from a printed matter, the overprinting precision can not meet the screen printing precision requirement due to insufficient circulating straightness, and the running precision of a common stainless steel belt or a common conveying belt can not meet the overprinting precision requirement; the stepping direction of the circulating belt is uncertain because the position of the circulating belt staying each time is uncertain (the manufacturing of the length of the circulating belt generates certain errors, even if the length of the circulating belt is 0,01mm is very large after thousands of running accumulations), the circulating belt stays at any position, the printing platform inhales and must be conducted, if the air suction holes cannot be effectively conducted, the air suction conduction is not enough, the silk screen plate cannot be separated from a printed matter, and silk screen printing cannot be realized, and 3) the position of the joint of the circulating belt is not flat and fine image printing cannot be realized.

The invention controls the circulating belt by a PLC or a singlechip touch screen driven by a servo motor or a stepping motor, ensures accurate stepping length, further ensures minimum inertia when the circulating belt is started at high speed and stopped at high speed, has larger diameter because the driving shaft is hollow, has small inertia when the driving area is increased, has the belt driving shaft surface coated with rubber or knurled to ensure that the circulating belt and the driving shaft do not skid, thereby ensuring accurate stepping position when the circulating belt runs at high speed, simultaneously has air suction and fixation when the circulating belt exchanges printing stock in the whole process, finally ensures accurate stepping of the printing stock, is provided with clamping wheels or clamping blocks at the lower sides of the circulating belt (6), is provided with clamping blocks from a working position to a printing position, clamps the two sides of the circulating belt to ensure accurate left and right directions when the circulating belt runs, and is provided with a circulating belt manufacturer for the grinding (the) to have high straightness (< 0.03mm) and flatness (< 0.02 mm) stainless steel belt or high-precision The leveling belt ensures that the circulating belt is completely leveled, the circulating belt has no joint and can print fine images at any position, and the air suction ports 23 of the printing station of the printing platform are designed into a plurality of intensive or long slotted holes and are arranged in parallel along the running direction of the circulating belt; the air suction holes 5 on the circulating belt can be communicated with the air suction ports 23 of the printing station of the printing platform (figure 20) by ensuring that the circulating belt stops at any position, and the comprehensive utilization of the method realizes that high overprinting precision can be completely achieved and fine patterns are clear when the circulating belt is directly printed. Breaks through the technical bias in the field, and provides a brand new solution for positioning the presswork of the flat-pressing full-automatic screen printing machine with a fixed shape and exchanging the presswork.

The circulating belt 6 is provided with positioning holes 20 with a stepping distance as an interval distance, and the positioning devices at the material receiving station 17 and/or the printing station 4 are sensors and/or positioning pins which correspond to the stop positions of the positioning holes and are used for longitudinally and transversely positioning the printing stock. The positioning pin or the sensor is positioned below the circulating belt (when the positioning pin or the sensor is positioned above the material receiving station circulating belt and is only used for positioning, the circulating belt does not need to be provided with a positioning hole), the positions of the positioning pin or the sensor correspond to the positions where the positioning holes stop, and the positioning pin or the sensor can be aligned with the positioning hole, penetrate through the positioning hole or penetrate through the positioning hole and are used for positioning a printing stock, or detecting the moving positions of the circulating belt and the printing stock, or detecting the existence of the printing stock. When the positioning pin or the sensor is used for positioning, the positioning pin or the sensor is divided into a longitudinal positioning pin (or a sensor) for longitudinal positioning and a transverse positioning pin (or a sensor) for transverse positioning. And in the printing time of the printing head, the printing stock is positioned at the positioning pin or the sensor of the material receiving station, after the printed matter of the printing station is printed, the circulating belt rotates, the next printing stock is transferred to the printing station, the positioning pin of the printing station is lifted out of the circulating belt or the sensor of the printing station to work, the printing stock is positioned, and then printing is carried out again.

The utility model also discloses a sheet-fed screen printing machine, include frame 1, storage platform, paper feeder, print platform 3 and connect material platform 7, install print head 2, its characterized in that in frame 1: the screen printing machine further comprises a screen printing conveying device, the conveying device comprises a circulating belt 6 rotating along the surfaces of the printing platform 3 and the material receiving platform 7, the circulating belt 6 is provided with a plurality of rows of air suction holes 5 for adsorbing printing stocks, one part of the circulating belt 6 is arranged along the printing platform 3 and the material receiving platform 7 in a parallel attaching mode, and the circulating belt 6 is provided with a limiting guide device; the circulating belt 6 is driven by a motor or an air cylinder which accurately controls the stepping length of the circulating belt 6, and a plurality of rows of printing station air suction openings 23 which are correspondingly communicated with the air suction holes 5 are formed in the printing platform 3; the circulating belt 6 corresponds to three stations, and is respectively a material receiving station 17, a printing station 4 and a discharging station 18 according to the longitudinal advancing direction of a printing stock; the conveying device is a synchronous conveying device, and means that one stepping distance of the circulating belt 6 completes the switching of the stations where the printing stocks are located and/or the switching of the printed matters and the stations where the printing stocks are located; the printing material is a shape-fixed and air-impermeable printing material. According to the storage table in the screen printing machine, the printing stock stored on the storage table is separated into single sheets by the paper feeder and conveyed to the synchronous conveying device, so that the problem of idling in the traditional screen printing machine is solved, and the conveying efficiency of the printing stock is improved.

The positioning of the printing stock can be carried out by adopting three modes, and the first mode is that a positioning device for limiting the printing stock is arranged at the material receiving station 17 and/or the printing station 4. The second is that the location that the stock connects the material station location can be realized to the material loading manipulator of paper feeder, and the storage platform of paper feeder has two orientation locating pin with great ease, and the stock is positioned on the storage platform and is placed, and the material loading manipulator is by servo motor, step motor drive stroke accurate control, and the material loading manipulator snatchs stock, the material loading manipulator of fixed position on the storage platform and puts the stock along linear rail and connect material station fixed position and realize connecing material station location stock promptly. The third mode is that a positioning table is arranged between the paper feeding machine and the circulating belt 6, the printing stock is positioned on the positioning table and then is grabbed by the same feeding manipulator, and the printing stock is positioned and placed at the designated position of the material receiving station to realize the positioning and the placement of the printing stock at the material receiving station. The material receiving station is provided with a plurality of lifting positioning pins in the longitudinal direction and the transverse direction (as mentioned above, the two modes are provided with holes 20, the positioning pins extend out of the holes and retract during operation, the circulating belt is provided with no holes, the positioning pins are pressed onto the circulating belt when positioned on the circulating belt and are lifted during circulating operation), the corresponding material feeding mechanical arm is provided with a friction block to drive the printing stock to move in the longitudinal direction and the transverse direction, the material feeding mechanical arm places the printing stock on the material receiving station, the friction block of the material feeding mechanical arm descends to contact the printing stock to move the printing stock, the direction of the material feeding mechanical arm firstly contacting the two positioning pins positions one side and then moves to the other side to position the other side, and. The three positioning modes are all to set up final positioning at the material receiving station, and the material to be printed after the positioning is induced draft by the endless belt and is fixed and need not switching once more and can print, and positioning accuracy is high.

The printing platform 3 is horizontally fixed on the frame 1, and the printing head 2 and the printing platform 3 are hinged and buckled or the printing head 2 and the printing platform 3 are connected in a hinged or relative up-down sliding structure. Or the printing platform 3 is obliquely fixed on the frame 1, the printing platform is arranged obliquely in a single direction when the printing platform 3 and the printing head 2 are buckled, and the printing head 2 and the printing platform 3 are connected in a hinged swinging structure or a structure capable of sliding up and down relatively. The utility model discloses a carry the printed matter around printing platform's endless belt, the average level setting when printing platform and print head lock, printing platform and print head can articulate the swing, also can slide from top to bottom relatively, and printing platform and print head can be fixed also can the relative oscillation in the working process of unloading and whole printing under last. The printing platform can be in a one-way inclined mode (the printing platform inclines towards one edge, the printing platform has two horizontal edges with different heights and two inclined oblique edges), and in the working process, the printing platform and the printing head can swing relatively, if the printing platform swings in one way, the inclined circulating belt can be adopted to combine with a positioning pin and a pull gauge mode to realize quick automatic positioning on the circulating belt. At the moment, the running direction of the ink scraping knife runs from high to low, and the running direction of the ink returning knife runs from low to high, so that the accumulation of ink on a printing plate can be reduced, the amount of ink stored at the edge of the screen printing plate is reduced, most of the ink in the screen printing plate moves, a printing area can be covered by using less ink, the number of times of machine halt and plate wiping is reduced, and the ink is particularly suitable for ink which is expensive, such as gold paste (because the ink stored in the screen printing plate is less) and ink with strong printing flowing property (because the ink is stored at the edge of the screen printing plate without patterns when the screen printing plate is an inclined machine is paused, so that the ink cannot drop from the screen printing plate).

The printing platform 3 is obliquely arranged on the frame, one oblique edge of the printing platform is hinged on the frame 1 or the printing head 2 through a swing hinge shaft 15 of a hinged swing structure, the printing platform 3 is driven by a swing driving mechanism 19, and the printing platform 3 is a bidirectional oblique printing platform when descending to a low position. When the printing platform and the printing head are buckled, the printing platform is in a one-way inclined state, the printing platform is hinged on the frame or the printing head through the swing link mechanism, when the printing platform swings downwards, the printing platform is in a two-way inclined state, a printing stock is positioned at a printing station, the circulating belt 6 is provided with positioning holes 20 taking a stepping distance as an interval distance, and a positioning device at the printing station 4 is a sensor and/or a positioning pin which corresponds to the stop position of the positioning holes and is used for longitudinally and transversely positioning the printing stock. The locating pin or sensor are located below the endless belt and are stretched out from the locating hole 20 when being positioned, the endless belt retracts when in operation, wherein the sensor or locating pin on one side can also be arranged near the endless belt, (the locating pin and the photoelectric switch structure on the inclined table are described in the prior patent of the utility model), the air valve of the printing station has the functions of blowing and air suction, the printing platform blows when the printing stock is positioned, the printed matter placed on the printing station can slide towards the lower corner, the longitudinal side edge and the transverse side edge (the bottom surface) are simultaneously positioned, the platform is positioned and air suction is completed to fix the printing stock, the complete automatic positioning can be realized, and other auxiliary mechanical positioning devices are not needed to drag the printed matter. The vertical and horizontal inclination behind the printing platform lower hem sets up to different angles, can make the printed matter form different translation rate in two directions, shortens the positioning time, and the position is more accurate simultaneously.

The longitudinal and transverse inclination angles of the bidirectional inclined printing platform 3 are set to be 6-20 degrees between one direction and the horizontal direction, and 3-10 degrees between the other direction and the horizontal direction. The printing machine is provided with an inclination angle of 6-20 degrees in one direction and 3-10 degrees in the other direction, so that the printing speed can be ensured, the quick positioning can be realized, and the corner clamping phenomenon can not occur. The corner clip means that when two edges of a printed matter are not parallel to a longitudinal or transverse positioning pin, the edges of the printed matter may incline when the printed matter approaches the positioning pin, one edge may only contact with one longitudinal positioning pin, and the other edge also only contacts with one transverse positioning pin, so that one corner of the printed matter can be clipped between two adjacent longitudinal positioning pins and transverse positioning pins, and the printed matter is askew on a printing station, which is commonly called a corner clip.

The synchronous conveying device further comprises a circulating belt roller, the circulating belt roller comprises a circulating belt driving roller, the circulating belt driving roller is hollow, a plurality of air blowing holes are formed in the outer surface of the circulating belt driving roller, and an air pipe is externally connected with the circulating belt driving roller. Through synthesizing servo motor or step motor drive endless belt PLC and touch-sensitive screen control in order to guarantee that the endless belt is step-by-step apart from accurate, further set up the endless belt drive shaft into hollow structure, inertia is minimum when guaranteeing high-speed start-up and high-speed stop, reduce drive inertia in the increase of drive roller diameter, endless belt roller surface rubber coating or annular knurl are not skidded with the drive shaft in order to guarantee the endless belt, thereby step-by-step position is accurate when guaranteeing the high-speed operation of endless belt, combine the fixed stock that induced drafts, above-mentioned structure finally makes the stock step-by-step accurate, at 6 both sides screens wheels of endless belt, the screens piece is guaranteed to move about the direction accurate.

The position of the discharging station close to the driving shaft is provided with a blowpipe, a blowhole of the blowpipe is correspondingly communicated with a circulating belt air suction hole 5 or is hollow in the circulating belt driving shaft, a plurality of blowholes which are penetrated through are arranged on the periphery of the outer surface of the driving shaft at different angles, the blowhole is correspondingly communicated with the circulating belt air suction hole 5 or is communicated with a ventilation groove, and a wind pipe blows air into the driving shaft, when the printed matter reaches the discharging station and needs to be separated from the circulating belt, the air blowing of the discharging station effectively solves the problem that the printed matter is separated from the circulating belt at a high speed, the air blowing is arranged to be beneficial to overcoming the problems that the thin printed matter can not be separated from the circulating belt at a high speed and the printed matter is electrostatically adsorbed on the circulating belt and the local vacuum adsorption and circulating belt of the printed matter, so that the printed matter is smoothly separated from the circulating belt to enter the next working procedure, the printed matter ejection of compact is rotated by the endless belt and is added the realization of blowing promptly, certainly also can snatch from ejection of compact station by the material taking manipulator.

The beneficial effects of the utility model reside in that:

the utility model realizes the synchronous conveying of the printed matter/printing stock in the circulating belt, and the next printing stock can be positioned after the printing stock enters the printing station, thereby effectively avoiding the work efficiency loss, greatly improving the screen printing efficiency by 900 sheets to 2000 sheets in one hour; the circulating belt PLC and the touch screen are driven by a servo motor or a stepping motor to control so as to ensure the accuracy of the stepping distance of the circulating belt, a driving shaft of the further circulating belt is of a hollow structure so as to ensure the minimum inertia when the circulating belt is started at a high speed and stopped at a high speed, the inertia is very small while the driving area is enlarged due to the fact that the hollow driving shaft of the driving shaft can be made larger, the surface of a belt driving shaft is coated with rubber or knurled so as to ensure that the circulating belt and the driving shaft do not slip, so that the stepping position accuracy of the circulating belt is ensured while the circulating belt runs at a high speed, meanwhile, the printing stock is fixed by air suction, the stepping accuracy of the printing stock is finally realized, the left and right running directions of clamping wheels and clamping blocks on the two sides of the circulating belt 6 are ensured to be accurate, the high straightness (< 0.03mm) and high flatness (< 0.02 mm) stainless steel belts or high-precision flat belts, the air suction holes 5 on the circulating belt can be communicated with the air suction ports 23 of the printing stations of the printing platform by ensuring the circulating belt to stop at any position, and the method is comprehensively utilized to realize high overprinting precision and fine pattern printing on the circulating belt directly.

Drawings

FIG. 1 is a schematic view of the screen printing machine of the present invention;

FIG. 2 is a top view of FIG. 1;

FIG. 3 is a schematic view of another configuration of the screen printing machine of the present invention, in which a positioning and feeding robot is employed;

FIG. 4 is a top view of FIG. 3;

FIG. 5 is a schematic structural view of a front-tilting printing conveyor;

FIG. 6 is a top view of FIG. 5;

FIG. 7 is a schematic view of a sloped endless belt configuration;

FIG. 8 is a side view of FIG. 7;

FIG. 9 is a schematic view of a rear inclined conveyor structure;

FIG. 10 is a top view of FIG. 9;

FIG. 11 is a schematic view of a screen printer of the horizontal printing conveyor;

FIG. 12 is a schematic view of a screen printing machine having a front-tilting printing conveyor;

FIG. 13 is a schematic view of a one-way inclined conveyor;

FIG. 14 is a schematic view of a bi-directional inclined conveyor;

FIG. 15 is a schematic view of a cylinder driven endless belt;

FIG. 16 is a top view of FIG. 14;

FIG. 17 is a schematic view of a positioning hole structure of the endless belt;

FIG. 18 is a schematic structural view of an air suction system of the receiving station and the printing station;

FIG. 19 is a top view of FIG. 18;

FIG. 20 is a schematic view of an air suction hole structure on a printing platform;

fig. 21 is a schematic diagram of the structure of an air suction hole on the material receiving platform.

Wherein, 1 is a frame, 2 is a printing head, 3 is a printing platform, 4 is a printing station, 5 is an air suction hole, 6 is a circulating belt, 7 is a material receiving platform, 11 is a circulating belt roller, 15 is a hinge shaft, 17 is a material receiving station, 18 is a material discharging station, 19 is a swing driving mechanism, 20 is a positioning hole, 22 is a material receiving station air suction port, 23 is a printing station air suction port, 24 is a material receiving station air suction system, 25 is a printing station air suction system, 26 is a drawing gauge, 27 is a drawing cylinder, 28 is a material loading manipulator, 29 is a paper feeder, 30 is a printing stock, 31 is a printing product, 32 is a positioning pin, 33 is a positioning table, 34 is a dryer, 35 is a circulating belt servo motor, 36 is a circulating belt speed reducer, 37 is a clamping edge guide wheel, 38 is a circulating belt guide block, 39 is a circulating belt guide roller, 40 is a material suction nozzle, 41 is an ink return knife, 42 is a scraping knife, 43 is a driving positioning block, 431 is a driving positioning block pushing cylinder, 432 is a driving positioning block lifting cylinder, 45 is a photoelectric switch, 46 is a material pressing wheel, 47 is a platform lifting cylinder, 48 is a crank link mechanism, 49 is a lifting motor, 50 is a lifting speed reducer, 52 is a pushing cylinder, 53 is a pushing upper pressure plate, 54 is a pushing pressure plate cylinder, 55 is a pushing lower pressure plate, 56 is a fixed pressure plate cylinder, 57 is a fixed upper pressure plate, 58 is a fixed lower pressure plate, and 59 is a stroke fine adjustment screw. 70 printing station air suction valves and 60 material receiving station air suction valves.

Detailed Description

The technical solution and the working principle of the present invention will be further described in detail with reference to the schematic drawings and the specific embodiments. The drawings of the present invention only show the parts related to the technical solutions of the claims of the present invention, but not all, the embodiments of the present invention are only described through the partially best embodiments, but not all the specific structures for realizing the objects of the present invention, and the embodiments can not be regarded as the scope of the claims of the present invention.

The definition of the related nouns in the utility model is as follows:

connect the material station: the printing stock is conveyed to the synchronous conveying device through the station, and the printing stock can be positioned at the receiving station, wherein the positioning can be as follows: positioning devices of the material receiving station, such as a pull gauge, a push gauge, a positioning pin and the like; positioning a printing stock by a positioning device on a paper feeding mechanical arm; after the positioning table in front of the circulating belt positions the printing stock, the manipulator grabs the printing stock to the designated position of the material receiving station, namely the manipulator positions the material and finishes the positioning of the printing stock at the material receiving station.

A printing station: the printing stock enters the position which is vertically corresponding to the screen printing plate (the position where the screen printing plate pattern is vertically projected and overlapped with the pattern to be printed by the printing stock), namely the printing stock enters the printing station.

A discharging station: the printing position is the position where the printed matter is sent out of the printing station, namely the position where the printed matter leaves the vertical coverage range of the silk screen plate, namely the discharging station.

A synchronous conveying device; the method is characterized in that the printing stocks (printed matters) at the material receiving station, the printing station and the discharging station are simultaneously conveyed.

Printing stock: before the printing ink is not obtained (whether the surface is covered by the ink or not), the printing material is used as a printing material.

Printing products: and obtaining at least part of the printing ink, and converting the printing material into a printed matter.

The first embodiment is as follows:

referring to fig. 1, the screen printing machine of the present invention is a single-sheet flatly-pressing type full-automatic screen printing machine, which adopts a circulating belt to synchronously feed and discharge materials. The printing synchronous conveying device in the embodiment comprises a paper feeding machine 29 and a machine frame 1, wherein a printing head 2, a printing platform 3 and a material receiving platform 7 are installed on the machine frame 1, and the printing platform 3 and the material receiving platform 7 can be of an integrated structure or a split structure. The printing platform 3 is horizontally fixed on the frame 1, the printing head 2 is arranged on the frame 1 in a hinged or up-and-down sliding mode, and the printing head 2 and the printing platform 3 are both horizontal when buckled.

The utility model discloses screen printing machine's paper feed machine 29 is including storing stock 30's lift storage platform, separation sola mechanism, automatic feeding structure etc. and automatic feeding structure can be material loading manipulator or by any one in conveyer belt, conveying roller and the pinch roller, can be the sucking disc that telescopic cylinder drove on the material loading manipulator, and separation sola mechanism can be preceding to inhale to fly to reach or the back is inhaled to fly to reach, and automatic paper feed machine has multiple mode with prior art in a word, and here does not detail.

The utility model mainly relates to a circulating belt 6, a printing platform 3, a material receiving platform 7 and a positioning mode thereof, wherein the printing platform 3 comprises a printing station 4, the material receiving platform 7 comprises a material receiving station 17, the circulating belt 6 is surrounded on the printing platform 3 and the material receiving platform 7, a discharging station 18 is arranged at the position of the other end of the printing platform 3 opposite to the printing station, the discharging station 18 can also be arranged on the printing platform 3 and is the rear section from the printing platform 3 to the section of the position of the rotating shaft of the circulating belt; the discharging station 18 is not a specific part, and is a part of a rotating shaft from the outside of the printing platform 3 to the advancing direction of the circulating belt 6, namely, a part of the printed matter which is sent out of the printing area can be called as the discharging station, certainly, the printed matter can be taken away by using a material taking manipulator, the discharging station exists as long as the function of sending the printed matter out is provided, and air is blown in the discharging station 18 of the circulating belt or a driving shaft at the discharging end of the circulating belt, so that the problem that the electrostatic adsorption or the thin printed matter is attached to the circulating belt and cannot be separated is.

The utility model discloses a 6 anterior segments of synchronous conveyor circulation area set up and connect the material station, connect the material station to be provided with positioner, and positioner is in 6 outsides in the circulation area. The positioning device is provided with a pull gauge 26 and a positioning pin which are positioned transversely and longitudinally. The material receiving station corresponds to an output end of an automatic feeding mechanism of a paper feeding machine, a printing stock is placed to the material receiving station by a feeding manipulator of the paper feeding machine (part of the printing stock of the material receiving station is arranged on a positioning device, and part of the printing stock is arranged on a circulating belt 6), the material receiving station positions the printing stock in a printing head ink scraping section, the printing stock is driven by a longitudinal drawing gauge (the longitudinal drawing gauge is a long strip or a plurality of short drawing gauges) to be positioned by two longitudinal positioning pins, then the printing stock is driven by a transverse drawing gauge to be positioned by transverse positioning pins to complete three-point positioning, and the circulating belt sucks air to position the printing stock to complete positioning of the printing stock at.

The utility model discloses a synchronous conveyor circulating belt 6 is installed in two pivots, and circulating belt 6 rotates around whole print platform 3 and connect material platform circulation 7, the utility model discloses a what 6 rear ends of circulating belt correspond is ejection of compact station 18. When the circulating belt 6 rotates around the receiving station and the printing station, the circulating belt rotates in a stepping mode, one printed material is transferred from the receiving station to the printing station when the circulating belt 6 rotates once, meanwhile, a printed product on the printing station is transferred to the discharging station 18 from the printing station or is transferred to the next process from the discharging station, and the distance of each rotation or stepping of the circulating belt 6 can be the distance of the front and back adjacent printed materials moving from the receiving station to the printing station, and can also be 1/2 stepping distance, namely the printed material arrives at the printing station from the receiving station in two steps. The endless belt 6 runs parallel to the surface of the printing platform 3, and the lower surface of the endless belt 6 runs against the surface of the printing platform 3. All be provided with air suction system in printing platform 3 and the material receiving platform 7 of sheet-fed concora crush formula screen printing machine, as shown in fig. 17, material receiving platform establishes material receiving platform air suction system 24, printing platform establishes printing platform air suction system 25, the aspiration channel is all being connected to two air suction system inlet scoops 22, 23, the hole for induced drafting 5 and inlet scoop 22 on the

circulatory belt

6, 23 correspond the switch-on, so that negative pressure wind in the passageway that induced drafts of printing platform and material receiving platform can see through hole for induced drafting 5 and hold the printed matter.

The utility model discloses connect the induced draft difference of material station and printing station, connect material station induced draft system 24 and printing station induced draft system 25 to be two way induced draft systems of independent difference separately, they all can realize different wind-force size and the different time of induced drafting under PLC's control. The material receiving station air suction system and the printing station air suction system are provided with switching air valves, and different air suction time and air pressure are controlled through the air valves. The paper feeder 29 puts the printing stock into the receiving station and completes positioning while the printing station prints, and the receiving station air suction system 24 does not suck or blow air during feeding so as to position the printing stock. The printing stock accomplishes the location at the material receiving station, through connecing material station air suction system 24 absorption fixed back, the circulation area operation, printing station and material receiving station all use the induced draft of little negative pressure when the circulation area operation, under the prerequisite of guaranteeing that the printing stock is adsorbed, the position keeps motionless, convey the printing station to, the circulation area can be very little with connecing material station, printing station frictional force like this. If the printing stock is positioned at the printing station and reaches the printing station, the air suction system 25 blows air to blow the printing stock away from the surface of the printing platform (circulating belt), so that the positioning of the printing stock at the printing station can be completed under the condition of no resistance, and the air valve is switched to suck air after the positioning is completed. When the printing station is used for printing, the printing station air suction system is switched to large negative pressure air suction, the printing station air suction system 25 generates strong air suction to fix the printing stock on the printing station, and the printing stock is ensured to be fixed at the printing position and can be ensured to be separated from the silk screen plate to obtain the printed matter of the printing ink. The distance between the air suction opening of the material receiving station air suction system 24 and the air suction opening of the printing station air suction system 25 is very small, the printing stock is always in an adsorption state in the moving process from the material receiving station to the printing station, and the position of the printing stock cannot be changed in the conveying process. Of course, the utility model discloses one set of wind regime of printing platform's induced-draft system also can share, connect material station (platform) this moment to also share an air valve with printing platform, switch the negative pressure simultaneously, can connect the bore and the quantity of the inlet scoop of the difference on material station and the printing station through setting for, perhaps through connecing material platform box side to set up the pressure release wind gap, and set up the air reduction board in the box, printing platform is to connecing multiple modes such as establishing the air valve between the material platform, come to reach and connect the material station to induced draft the very little purpose that does not influence drive locate function of wind-force when the location, can reach two sets of air valve control the same effect.

The material pressing ball or the material pressing wheel is arranged on the material receiving station section circulating belt 6 to press the printing stock, so that the effect equal to negative pressure fixing can be realized, and the material receiving station is not provided with an air suction system and a material receiving station air suction hole.

When printing is carried out, the printing platform sucks air under large negative pressure and fixes a printing stock so as to prevent the scraping of the doctor blade 42 and prevent a printed matter from being stuck on the silk screen plate when the viscosity of ink is too high; when the circulating belt 6 moves, an air valve of the whole air suction system switches negative pressure into small air pressure so as to reduce the friction force when the circulating belt 6 moves; while the doctor blade 42 prints, the paper feeder 29 places the printing material into the receiving station (at this time, the receiving station does not suck or blow air), the receiving station positions the printing material and sucks air for fixation, and after printing is completed, the printing head returns ink (the ink return blade covers the ink on the upper silk screen plate) while the circulating belt runs, so that the printed matter is sent out of the printing station and sent into the printing station.

The printing station air suction ports 23 of the air suction system on the printing platform 3 are arranged into a plurality of rows of long slotted holes (narrow slits) or a queue formed by densely arranged multiple holes with the same effect, the arrangement of the long slotted holes is parallel to the moving direction of the circulating belt 6, the circulating belt 6 is provided with a plurality of rows of air suction ports 5, the printing platform is provided with a plurality of rows of long slotted holes, and the number and the position of the long slotted holes correspond to those of the air suction ports; the circulating belt 6 is provided with a clamping edge guide wheel 37 or a positioning block, the positioning block can be fixed on a printing platform or a material receiving platform to clamp a half-ring on the circulating belt, can also be fixed on a machine frame to clamp a half-ring on the circulating belt, can also be provided with a blocking sleeve on a driving shaft at two ends, used for limiting the left-right swing of the circulating belt 6 and ensuring the circulating belt to run along a straight line, because the air port of the printing platform is a long slotted hole or a densely arranged hole, after the circulation belt is positioned left and right, the small holes on the circulation belt are always in the same position with the long slotted holes, as shown in figure 8, because the printing platform 3 is provided with the long slotted holes, therefore, the small holes on the circulating belt can be communicated with the 3 air ports of the printing platform no matter the stepping size of the circulating belt, the principle of the material receiving platform and the ventilation opening of the printing platform is the same, the density can be smaller, and the air ports on the surface of the material receiving platform or the printing platform can be processed into a grid form to be communicated with the air passage.

The utility model discloses a circulation area 6 is the confined annular, and circulation area 6 can be 0.1 ~ 0.5mm thick rigidity area or 0.5 ~ 5 mm's flat belt, is best in the tensioning state all the time above the circulation area 6. The rigid belt is generally made of stainless steel materials, so that the self weight of the circulating belt is lighter, the strength is higher, and the running and printing precision of the rigid belt made of the stainless steel materials is higher than that of a flat belt; the upper surface of the printing platform is provided with a guide block 38 or a clamping wheel for limiting the position of the circulating belt, a pair of circulating belt guide rollers 39 is arranged at the lower half circle of the circulating belt, a pair of clamping edge guide wheels 37 is arranged beside the guide rollers 39, and the guide rollers 39 are used for clamping the circulating belt up and down and enabling the thin steel belt to be stiffened so as to enable the guide wheels 37 to clamp the circulating belt more effectively and ensure that the circulating belt runs along a straight line; the circular belt is thicker or in a tensioning state, a pair of guide wheels 37 can be independently used, the stepping distance of the circular belt is driven by a servo motor or a stepping motor, a driving shaft can be double-driving at two ends or driving at one end, and one end of the driving shaft is driven by one end, the driving shaft is coated with rubber or knurled to increase friction force so as to ensure accurate non-slip step distance in operation, an air cylinder can be used for replacing two groups of clamping plates of the servo motor (shown in figure 9), one group of clamping plates is driven by an air cylinder to be called as a movable clamping plate, the other group of clamping plates is called as a fixed clamping plate, the air cylinder drives one group of clamping plates to clamp the circular belt to operate towards a discharging station, an air cylinder stroke adjusting limiting screw or limiting block is arranged at the tail end of the stroke, an air cylinder piston or clamping plate hits a limiting stop, the other group of fixed air cylinder presses the, the circulating belt driving motor is a stepping motor or a servo motor controlled by a touch screen and a PLC (programmable logic controller), the moving step distance of the running of the circulating belt can be set at will, and the step distance of the circulating belt driven by a cylinder to run is adjusted by changing the position of a stroke adjusting limit screw or a limit block. It should be noted that, when the requirement for printing quality is not high, the circulating belt 6 of the present invention can be replaced by a flat belt with holes or a wire mesh belt.

The material loading manipulator 28 or the material loading conveyer belt of the paper feeder 29 puts the printing stock into the material receiving station, and then the printing stock is conveyed to the printing platform by the circulating belt 6 and then enters the material discharging station, and the movement of the printing stock from the material receiving station 17, the printing station 4 and the material discharging station 18 is synchronously completed by supporting, adsorbing and fixing on the circulating belt 6. The printed matter arrives at the discharge station 18 and then falls directly onto a printed matter output device (such as a conveyor belt), and the printed matter is sent to a drying and drying machine 34 (such as a drying channel) by the printed matter output device for subsequent treatment. In the printing time of the printing head, after a material receiving station on the circulating belt 6 receives a printed material transmitted by a paper feeding machine, the printed material is automatically positioned by a positioning pin and a pull gauge at the material receiving station, the printed material is fixedly adsorbed through an air suction hole, after the printed material at the printing station is printed, the circulating belt rotates, the printed material rotates to the printing station in an adsorption state, then the printing is directly started, and after the printing is finished, the printed material is sent to a discharging station by the circulating belt. The printed matter is fixed on the circulating belt by air suction adsorption after reaching the material receiving station of the circulating belt and being automatically positioned until the printed matter is conveyed to the material discharging station after being printed. Because the presswork of the structure does not need to be positioned after reaching the printing station, and the positioning at the material receiving station is completed within the working time of the printing head, the positioning time of the printing station can be further saved, and the printing efficiency is greatly improved.

Example two:

the synchronous conveying device of the utility model is arranged in the circulating belt 6 and the printing head 2 in a one-way inclined way, and has four modes;

the first is shown in fig. 9, the material receiving station is low, the material discharging station is high, the circulating belt runs from low to high, and the longitudinal positioning of the material receiving station 17 is realized by using gravity. The longitudinal pull gauge is removed and the positioning columns are reserved, the transverse pull gauge positioning pins are the same as the first scheme, when the material loading manipulator places the printing stock on the material receiving station, the printing stock slides onto at least two longitudinal positioning pins due to gravity, the transverse pull gauge drives the printing stock to reach the transverse (lateral) positioning pins, three-point positioning is realized, the circulating belt adsorbs the printing stock,

the second type is shown in figure 12, the material receiving station is high, the material discharging station is low, the circulating belt runs from high to low, the material receiving station is longitudinally positioned by using gravity to remove a longitudinal drawing gauge and keep a positioning column, the circulating belt 6 is provided with positioning holes 20 taking a stepping distance as a spacing distance, the positioning holes 20 can be round holes or strip holes, the length direction of the strip positioning holes is along the rotating direction of the circulating belt, the material receiving platform 7 is provided with at least 2 telescopic cylinders, the telescopic cylinders extend out of the circulating belt 6 from the positioning holes 20 to position the longitudinal position of a printing stock, the transverse positioning device is higher than the circulating belt, the positioning pins descend to contact the circulating belt when in positioning, and the printing stock is driven by friction blocks or friction wheels to move towards; when the material loading manipulator puts the printing stock to connect the material station, because gravity printing stock landing is on two at least vertical locating pin, the printed stock arrival horizontal (side direction) is to the locating pin to rubbing block or friction wheel drive, realizes three-point location, and horizontal positioner rises behind the circulating band absorption printing stock location printing stock, accomplishes material loading and location printing stock, and vertical position also can be higher than the circulating band (setting promptly on the circulating band), and the locating pin descends the contact band circulating band when the location, and the locating pin rises behind the location completion and the absorption fixed printing stock.

In the third method, as shown in fig. 7 and fig. 8, the material receiving station and the material discharging station are the same in height, the driving shafts at the two ends of the circulating belt run obliquely, at least two positioning pins are arranged at the lower edge of the circulating belt of the material receiving station or the printing station to position one edge of the printing stock (the same as the second principle), when the material receiving station 17 is positioned, the longitudinal positioning pin of the circulating belt can be higher than the circulating belt, the positioning pin descends to contact the circulating belt during positioning, a friction block or a friction wheel drives the printing stock to move towards the positioning pin, when the printing station is positioned, the positioning holes 20 with the stepping distance as the interval are required to be arranged on the circulating belt 6, the printing platform 7 is provided with a telescopic cylinder or a photoelectric sensor corresponding to the positioning holes 20, the telescopic cylinder drives the positioning pin to extend out of and retract into the, completing the longitudinal position of the printing stock, and retracting the positioning pin; it should be noted that a photoelectric switch 45 for detecting the position 6 of the circulating belt is also arranged at the material receiving station, and when the circulating belt runs for multiple times to accumulate errors and the printing stock reaches an accurate position by changing the material loading position, the position of the positioning hole 20 is located on the positioning telescopic cylinder; the positioning device can be arranged only at the material receiving station or the printing station, or can be arranged at both the material receiving station and the printing station 4.

The method is as follows: the position of 1mm-3mm outside the material receiving station circulating belt is provided with two positioning pins to position one side of a printed matter (namely the positioned printed matter extends out of the circulating belt by 1-3mm, and the purpose is to facilitate the detection of a photoelectric switch of a printing station), the printing station is provided with a mode of positioning one photoelectric switch or positioning pins to position the other side, a needle selection type photoelectric switch is arranged outside the closed circulating belt, a square positioning pin is also arranged outside the closed circulating belt, the printed matter is arranged along the circulating belt 6, the circulating belt 6 is fixedly arranged in a one-way inclined way, a manipulator or a conveying belt of a feeder puts the printed matter on a material receiving station when a printing head scrapes the ink (prints), the printed matter falls on the two positioning pins to be positioned at one side and is fixed by air suction because the circulating belt 6 (material receiving station) is in the one-way inclined way (at the moment, the material receiving, The printing platform switches small suction negative pressure, the circulating belt 6 rotates to synchronously exchange printing stocks when the printing head returns ink, the photoelectric switch of the printing station detects that the circulating belt of the printing stocks stops running, the printing station absorbs large suction, the ink scraper starts printing, and meanwhile, the mechanical arm or the conveying belt of the feeder puts the next printing stock to the material receiving station for circulation.

Or two positioning pins can be arranged at the position of the material receiving station clinging to the outer side of the circulating belt, a positioning hole 20 with a stepping distance as a spacing distance is arranged on the circulating belt 6, a photoelectric switch or a positioning pin is arranged on the printing station, the positioning hole 20 is opposite to the photoelectric switch or the positioning pin, the material receiving station is provided with a photoelectric switch for detecting the position of the circulating belt, the stroke of the feeding manipulator can be increased or reduced according to the requirement under the control of a PLC (programmable logic controller), the manipulator or the conveying belt of the feeding machine puts the printing stock into the material receiving station when the printing head scrapes ink (prints), the printing stock falls on the two positioning pins to be positioned at one side and fixed by air suction because the circulating belt 6 (the material receiving station) is in one-way inclination (at the moment, the material receiving station does not suck air or blow air), the printing stock is switched to be, the printing station photoelectric switch detects that the printing stock circulating belt stops running, the printing station is adsorbed by large suction, the doctor blade starts printing, and meanwhile, a mechanical arm or a conveying belt of the feeding machine puts a next printing stock to the material receiving station to circulate.

The other steps are the same as those of the first embodiment.

Example three:

the utility model discloses a printing head one-way inclined hinge or up-and-down sliding setting is on the frame, the direction of operation of the ink scraping knife is from high position to low position, the direction of operation of the ink returning knife is from low position to high position, the circulating belt 6 (including the material receiving station, the printing station and the discharging station) one-way inclined hinge of the synchronous conveying device is on the frame, the inclination of the hinge shaft is set, the circulating belt 6 is buckled with the printing head by the crank connecting rod or the cylinder drive, one-way inclination when the circulating belt 6 is opened and closed with the printing head 2, two-way inclination when the circulating belt 6 descends, the circulating belt 6 is provided with the positioning holes 20 with the step distance as the interval distance, the positioning holes 20 can be one, two or three, the printing station is provided with the telescopic positioning pin corresponding to the positioning holes 20, the cylinder drive positioning pin stretches out the circulating belt and retracts into the printing platform, the material receiving station is provided with, the circulating belt 6 is driven by a cylinder to extend out of the circulating belt and retract into the material receiving platform through a positioning pin.

Because printed matters are mostly rectangular, two feeding modes exist; the method is characterized in that the printed matter is placed in the circulating belt in a forward direction, the method is placed in a transverse direction, reasonable positioning points of the printed matter are two long edges and one short edge, when one positioning hole is formed in the circulating belt 6, two positioning pins are arranged on the lower edge close to the circulating belt 6 and can be arranged at a material receiving station or a printing station, or the printed matter can be arranged at two stations and is placed along the circulating belt; when two positioning holes are arranged on the circulating belt 6, a positioning pin is arranged close to the lower edge of the circulating belt 6, and can be arranged at a material receiving station or a printing station, or both the two stations can be arranged so that a printed matter is placed transversely to the circulating belt; when three positioning holes are formed in the circulating belt 6, the printed matters on the circulating belt 6 can be placed along and transversely, two positioning pins on the long side are required to be arranged according to the placement of the printed matters, one positioning pin is required to be arranged on the short side, and two circulating belts can be arranged in the forward direction, one circulating belt can be arranged in the transverse direction, and one circulating belt can be arranged in the transverse direction; inclination also needs to be confirmed according to the printed matter placing mode, two positioning pins are arranged on the low side of the large inclination angle, one positioning pin is arranged on the low side of the small inclination angle, the positioning effect is best when the small inclination angle is 1/2 of the large inclination angle, and the hinge shaft and the opening and closing action which angle is large can be realized.

In summary, there are two implementation ways:

the first method is as follows: positioning one edge of the material receiving station and positioning three points again of the printing station; when a circulating belt 6 and a printing head are buckled and ink scraping (printing) by a manipulator or a conveying belt of a feeding machine, a printing stock is placed at a material receiving station, the circulating belt 6 (the material receiving station) is in one-way inclination (the material receiving station does not suck or blow air at the moment), the printing stock falls onto two positioning pins to be positioned at one side and is sucked to fix the printing stock, the printing stock scraping at the printing station is completed, a printing platform switches small suction negative pressure, the circulating belt 6 swings downwards and rotates to exchange the printing stock while ink is returned by the printing head, one step pitch of the circulating belt is completed, positioning pins of the printing platform extend out of the circulating belt, the printing platform blows air, the printing stock is positioned by the gravity because the printing platform is supported in a double-inclination way at the moment, the three points of the printing stock are positioned, the large negative pressure air suction is fixed after the positioning, the circulating belt 6 rises to be buckled with the printing, because the synchronous exchange printed matter has no mechanical arm return action, the high-speed printing and the high-precision positioning printing can be realized.

The second method comprises the following steps: the material receiving station is not positioned and a printing station is positioned in a three-point positioning mode; when a mechanical arm or a conveying belt of the feeder is buckled with a printing head for scraping ink (printing), a printing stock is placed on a material receiving station because the position is fixed when the printing stock is grabbed, the operation position of the mechanical arm or the conveying belt is controlled by a servo motor or a stepping motor to be accurate, the initial positioning effect can be achieved when the printing stock is transferred to the material receiving station, the material receiving station does not need to be provided with a positioning device for directly sucking and fixing the printing stock, when the ink scraping and printing of the printing station printing head are completed, a printing platform switches small suction negative pressure, the circulating belt 6 swings downwards and rotates to exchange the printing stock simultaneously when the ink of the printing head is returned, one step pitch of the circulating belt is completed, a positioning pin of the printing platform stretches out of the circulating belt, the printing platform blows air, the printing platform is doubly inclined, the printing stock is positioned by the gravity, the large, The ink scraping knife begins printing, and the next printing stock is placed to the material receiving station by the feeder manipulator or the conveyer belt in the circulating mode.

The other steps are the same as those of the first embodiment.

Example four:

referring to the attached drawings 3 and 4, a positioning table is arranged between a feeding machine and a circulating belt 6, a mechanical arm is used for grabbing a positioned printing stock to a material receiving station, the material receiving station and a printing station are not positioned, or a feeding mechanical arm with a positioning function is used for feeding the material receiving station, the positioning table is provided with a longitudinal positioning pull gauge, a positioning pin, a transverse positioning pull gauge and a positioning pin, the printing stock is placed on the positioning table by a first mechanical arm or a conveying belt of the feeding machine, the second mechanical arm takes out the positioned printing stock of the positioning table and places the positioned printing stock to the material receiving station when a printing head scrapes ink (prints), the circulating belt 6 directly sucks air to fix the printing stock, the printing head of the printing station finishes ink scraping, the printing platform switches small suction negative pressure, the printing head returns ink, the circulating belt 6 rotates to synchronously exchange the printing stock when the printing head finishes ink scraping, the printing stock reaches the printing station, namely, The second mechanical arm puts the next stock to connect the material station so circulation, because synchronous exchange printed matter does not have printing platform action of opening and shutting and manipulator return action, can realize high-speed printing.

The feeding manipulator with the positioning function is selected for feeding the material receiving station, the manipulator of the feeding machine is provided with a longitudinal and transverse positioning device, which is the prior art and is not detailed, the manipulator of the feeding machine places a printing stock on the material receiving station and positions the printing stock immediately, the circulating belt 6 sucks air to fix the printing stock, the printing station printing head scrapes ink at the moment, the printing platform switches to a small suction negative pressure, the circulating belt 6 rotates to synchronously exchange the printing stock while the printing head returns ink, the printing stock is synchronously exchanged when the printing head reaches the printing station, namely, the large suction is absorbed, the ink scraping knife starts to print, the manipulator of the feeding machine places the next printing stock on the material receiving station and positions immediately, and the circulation is realized because the synchronously exchanged printing product does not have the.

The above embodiments are merely examples of various design modes of the present invention, and the present invention can also be applied to other structures. Such as: the utility model discloses a circulating belt can also not be with the printing station one whole area of the same width, but set up many, and feeding conveyer belt 12 and circulating belt 6 can share a support pivot this moment, and this is applicable to the stock that has enough thickness and intensity too, and it can not influence the printing quality because of gapped between the circulating belt, need not open the locating hole again on the circulating belt this moment, locating pin sensor etc. set up in the clearance department between two root zone can; the utility model discloses a two segmentations can also be designed into to the circulatory belt 6 to reduce its theory of operation of circulating length still the same.

Claims

1. A screen printing conveyor, conveyor includes along printing platform (3) surface pivoted circulatory belt (6), and circulatory belt (6) are opened has suction hole (5) of adsorbing the stock, its characterized in that: a part of the circulating belt (6) is arranged along the printing platform (3) and the material receiving platform (7) in a parallel fit mode, and a printing station air suction opening (23) corresponding to the air suction hole (5) in position is formed in the printing platform (3); the circulating belt (6) is driven by a motor or an air cylinder for controlling the stepping length of the circulating belt (6); the circulating belt (6) corresponds to three stations and is respectively a material receiving station (17), a printing station (4) and a discharging station (18) according to the longitudinal advancing direction of a printing stock; the conveying device is a synchronous conveying device, and means that the switching of the working positions of the printing stocks and/or the switching of the printed matters and the working positions of the printing stocks are completed by one stepping distance of the circulating belt (6); the printing material is a shape-fixed and air-impermeable printing material.

2. A screen printing transfer apparatus according to claim 1, wherein: and a positioning device for limiting the printing stock is arranged at the material receiving station (17) and/or the printing station (4).

3. A screen printing transfer apparatus according to claim 1, wherein: the material receiving platform (7) is also provided with a material receiving station air suction opening (22) corresponding to the position of the air suction hole (5), and the material receiving station air suction opening (22) is connected to a material receiving station air suction system through a material receiving station air suction valve (60); a printing station air suction opening (23) of the printing platform is connected to a printing station air suction system through a printing station air suction valve (70).

4. A screen printing transfer apparatus according to claim 1, wherein: the circulating belt (6) is a rigid belt with the thickness of 0.1-0.5 mm or a flat belt with the thickness of 0.5-5 mm; the circulating belt (6) is provided with a limiting and correcting device; the circulating belt is also provided with a plurality of clamping edge positioning blocks or positioning rotating shafts for limiting the moving track of the circulating belt.

5. A screen printing transfer apparatus according to any one of claims 1 to 4, wherein: positioning holes (20) taking the stepping distance as the interval distance are arranged on the circulating belt (6), and positioning devices at the material receiving station (17) and/or the printing station (4) are sensors and/or positioning pins which correspond to the stop positions of the positioning holes and are used for longitudinally and transversely positioning the printing stock.

6. The utility model provides a sheet-fed screen printing machine, includes frame (1), storage platform, paper feeding machine, printing platform (3) and connects material platform (7), installs print head (2), its characterized in that on frame (1): the screen printing machine further comprises a screen printing conveying device, the conveying device comprises a circulating belt (6) rotating along the surfaces of the printing platform (3) and the material receiving platform (7), the circulating belt (6) is provided with an air suction hole (5) for adsorbing a printing stock, one part of the circulating belt (6) is arranged along the printing platform (3) and the material receiving platform (7) in a parallel attaching mode, and the circulating belt (6) is provided with a limiting and aligning device; the circulating belt (6) is driven by a motor or an air cylinder which accurately controls the stepping length of the circulating belt (6), and a printing station air suction opening (23) which is communicated with the air suction hole (5) correspondingly is formed in the printing platform (3); the circulating belt (6) corresponds to three stations and is respectively a material receiving station (17), a printing station (4) and a discharging station (18) according to the longitudinal advancing direction of a printing stock; the conveying device is a synchronous conveying device, and means that the switching of the working positions of the printing stocks and/or the switching of the printed matters and the working positions of the printing stocks are completed by one stepping distance of the circulating belt (6); the printing material is a shape-fixed and air-impermeable printing material.

7. The sheet-fed screen printing machine of claim 6, wherein: and a positioning device for limiting the printing stock is arranged at the material receiving station (17) and/or the printing station (4).

8. The sheet-fed screen printing machine of claim 6, wherein: the feeding manipulator of the paper feeder is a manipulator with a printing stock positioning function; and a positioning device for limiting the printing stock is further arranged at the material receiving station (17) and/or the printing station (4).

9. The sheet-fed screen printing machine of claim 6, wherein: and a positioning table is arranged between the paper feeding machine and the circulating belt, and the paper feeding machine is also provided with a manipulator for transferring the printing stock positioned by the positioning table to the receiving station.

10. The sheet-fed screen printing machine of claim 6, wherein: printing platform (3) level is fixed on frame (1), and printing head (2) and printing platform (3) lock time level set up, and the connected mode of printing head (2) and printing platform (3) is articulated swing structure or relative gliding structure from top to bottom.

11. The sheet-fed screen printing machine of claim 6, wherein: printing platform (3) slope is fixed on frame (1), and printing platform sets up for one-way slope when printing platform (3) and print head (2) lock, and the connected mode of print head (2) and printing platform (3) is articulated swing structure or relative gliding structure from top to bottom.

12. The sheet-fed screen printing machine of claim 6, wherein: the printing platform (3) is obliquely arranged on the rack, one oblique edge of the printing platform is hinged to the rack (1) or the printing head (2) through a swing hinge shaft (15) of a hinged swing structure, the printing platform (3) is driven by a swing driving mechanism (19), and the printing platform (3) is a bidirectional oblique printing platform when descending to a low position; the included angle between one direction of the bidirectional inclined printing platform and the horizontal direction is 6-20 degrees, and the included angle between the other direction of the bidirectional inclined printing platform and the horizontal direction is 3-10 degrees.

13. The sheet-fed screen printing machine of claim 6, wherein: printing station air suction openings (23) which are communicated with the air suction holes (5) correspondingly are formed in the printing platform (3) and are arranged in multiple rows; the printing station air suction opening (23) is positioned on the upper surface of the printing platform (3); the printing station air suction opening (23) is a plurality of rows of long slotted holes or a plurality of holes which are densely arranged; the printing station air suction openings (23) are arranged in multiple rows, and each row is provided with a plurality of long slotted holes or a plurality of holes which are densely arranged; the printing station air suction openings (23) are arranged in parallel along the running direction of the endless belt; and the printing station air suction opening (23) is correspondingly communicated with the air suction hole (5) of the circulating belt.

14. The sheet-fed screen printing machine of claim 6, wherein: the synchronous conveying device also comprises a circulating belt roller, the circulating belt roller comprises a circulating belt driving roller, the circulating belt driving roller is hollow, a plurality of air blowing holes are formed in the outer surface of the circulating belt driving roller, and an air pipe is externally connected with the circulating belt driving roller; and a blowing pipe is arranged beside the circulating belt driving roller, an air opening of the blowing pipe is correspondingly communicated with an air suction opening of the circulating belt, and the blowing pipe is externally connected with a ventilation pipe.