CN216761172U

CN216761172U - Printing stock positioner and screen printing machine that screen printing machine was used

Info

Publication number: CN216761172U
Application number: CN202220327918.7U
Authority: CN
Inventors: 张永胜
Original assignee: Shijiazhuang Shenghui Machinery Technology Co ltd
Current assignee: Shijiazhuang Shenghui Machinery Technology Co ltd
Priority date: 2022-02-17
Filing date: 2022-02-17
Publication date: 2022-06-17
Anticipated expiration: 2032-02-17

Abstract

The application discloses stock positioner and screen printing machine that screen printing machine was used belongs to screen printing machine's technical field, and this stock positioner is including setting up first actuating mechanism on screen printing machine's printing platform or printing platform bracket, setting up in the preforming fixture of printing platform upper surface and setting up the second actuating mechanism on screen printing machine's printing platform or printing platform bracket. The press sheet clamping mechanism comprises an upper press sheet and a lower press sheet, the upper press sheet and the lower press sheet are connected with the power output end of the first driving mechanism, the second driving mechanism is used for enabling the upper press sheet of the press sheet clamping mechanism to open and close, the action of clamping a printing stock is completed, the press sheet clamping mechanism enables the printing stock to move along the upper surface of the printing platform under the driving action of the first driving mechanism, and the printing stock on the printing platform of the screen printing machine is positioned more accurately when the printing stock is bent.

Description

Printing stock positioner and screen printing machine that screen printing machine was used

Technical Field

The application relates to the technical field of screen printing machines, in particular to a printing stock positioning device for a screen printing machine and a screen printing machine.

Background

At present, some of the existing screen printing materials, namely printing stocks, are bent, when the printing stocks are bent downwards and placed on an inclined printing platform of a screen printing machine, two edges of the printing stocks bear the weight of the printing stocks, at the moment, the printing platform blows upwards to prevent the printing stocks from suspending, and under the condition, the friction force borne by the printing stocks is greater than the gliding gravity, so that the gravity positioning cannot be realized.

In addition, some printing plants can upgrade semi-automatic screen printing machine into full-automatic screen printing machine, and current transformation scheme has outside screen printing machine prepositioning earlier, snatchs the stock to the printing platform by the manipulator promptly, just no longer fixes a position afterwards, and this kind of mode has realized automation, nevertheless because the stock is being absorb, the manipulator operation, place the easy emergence displacement of in-process to cause and place the inaccurate problem of holding a print position location on the printing platform.

Therefore, a printing material positioning device for a screen printing machine and a screen printing machine are required to improve the above problems.

SUMMERY OF THE UTILITY MODEL

In order to enable the printed material to be accurately positioned on a printing platform of a screen printing machine when the printed material is bent, the application provides the printed material positioning device for the screen printing machine and the screen printing machine.

In a first aspect, the present application provides a printed material positioning device for a screen printing machine, which adopts the following technical scheme:

a substrate positioning apparatus for a screen printing machine, comprising:

the first driving mechanism is arranged on a printing platform or a printing platform bracket of the screen printing machine;

the pressing piece clamping mechanism is arranged on the upper surface of the printing platform and comprises an upper pressing piece and a lower pressing piece, the upper pressing piece and the lower pressing piece are connected with a power output end of the first driving mechanism, and the pressing piece clamping mechanism enables the printing stock to move along the upper surface of the printing platform under the driving action of the first driving mechanism; and

and the second driving mechanism is arranged on a printing platform or a printing platform bracket of the screen printing machine and is used for opening and closing the upper pressing sheet of the pressing sheet clamping mechanism to finish the action of clamping the printing stock.

Through adopting above-mentioned technical scheme, preforming fixture makes the last preforming open and shut under second actuating mechanism's effect, the action of centre gripping stock is accomplished, order about preforming fixture by first actuating mechanism again and drive the stock and move along screen printing machine's printing platform surface, do not destroy original printing platform structure, it is clear to make the printing image, printing ink thickness is even, and to crooked stock, go up the preforming and open and shut the back with the lower preforming, the edge of lower preforming bearing stock, the crooked limit of stock falls down on the lower preforming, the stock is pushed down by last preforming again, make crooked stock also can be flattened, and then the stock location on screen printing machine's printing platform is more accurate when making the stock crooked.

Optionally, the substrate positioning device for the screen printing machine further includes:

the positioning piece is arranged on a printing platform of the screen printing machine and used for positioning a printing stock;

the positioning piece comprises at least two front positioning pieces and a side positioning piece; the front positioning piece and the side positioning pieces are telescopic positioning pins; the positioning pin and the tablet clamping mechanism are embedded; the front positioning piece is provided with a rotating bearing; the printing platform of the screen printing machine is also provided with a first sensor for detecting whether the printing stock reaches the designated position.

By adopting the technical scheme, the two front positioning pieces and the side positioning piece are used for limiting the printing stock to move continuously after moving to the preset position, the situation that the moving exceeds the positioning point is avoided, the first sensor can also detect whether the printing stock reaches the specified position, the printing stock can be positioned more accurately, and the situation that the printing stock is printed wrongly when the positioning is inaccurate and the printing stock is absent is avoided.

Optionally, an included angle exists between the moving track of the tablet clamping mechanism and a connecting line between the two front positioning pieces, and the included angle is 3-5 °, 5-15 °, 15-25 °, 25-35 ° or 35-45 °.

Through adopting above-mentioned technical scheme, with preforming fixture's orientation change, the line that makes between preforming fixture's the removal orbit and the two preceding setting elements has the contained angle, when preforming fixture centre gripping stock and when the surperficial slope removal of following printing platform under first actuating mechanism's effect, the stock at first can touch two preceding setting elements, then the stock can continue to move to the direction that is close to side setting element, finally realize three point location, can realize contacting two preceding setting elements earlier through the blowing position more near preceding setting element, can realize contacting two preceding setting elements earlier through inclination.

Optionally, the printing stock positioning device is provided with a plurality of groups, and moves to different directions to complete the positioning of the printing stock.

By adopting the technical scheme, the arrangement of the multi-group printing stock positioning devices and the movement to different directions can complete the positioning of the printing stocks, so that the positioning of the printing stocks in different directions can be faster and more accurate.

Optionally, the printing platform is obliquely arranged during feeding, and the printing stock positioning device is provided with a group; and the moving track of the printing stock positioning device is parallel to the connecting line of the two front positioning points.

Through adopting above-mentioned technical scheme, because be the slope setting during the printing platform material loading, rely on the action of gravity of stock to carry out the location of the preceding side of stock this moment, rely on a set of stock positioner again in addition to accomplish the location of stock, save screen printing machine's improvement cost.

the pressure adjusting mechanism is used for applying acting force to the upper pressing plate and/or the lower pressing plate; the force application component of the pressure adjusting mechanism is an air cylinder or a spring.

By adopting the technical scheme, because the bending degree of the printing stock is different, the pressure required to be applied to the tabletting and clamping mechanism is different, and when the thickness of the printing stock changes, the pressure adjusting mechanism can be used for adjusting the pressure of the printing stock. And the upper pressing sheet of the pressure regulating mechanism is easy to generate fatigue deformation after being repeatedly jacked up and put down, and after the upper pressing sheet generates fatigue deformation, the pressing sheet clamping mechanism can be regulated to generate proper pressure on the printing stock through regulating the pressure regulating mechanism. The printing stock positioning device has the advantages that the printing stocks with different thicknesses and weights can obtain proper friction force, so that the printing stocks can be driven quickly, the thin printing stocks are not bent at the positioning points due to overlarge friction force, and the same printing stock positioning device can drive a thick printing stock to be positioned quickly and can realize accurate positioning of the thin printing stocks.

one end of the first air pipe is communicated with an air port arranged on the printing platform, the printing platform is hollow, the air port comprises a front air port and a lower air port, the first air pipe is fixed on the lower air port, and the other end of the first air pipe is communicated with a positive pressure air source and a negative pressure air source of the screen printing machine and is used for enabling a printing stock to be suspended or fixed on the printing platform; in addition, an independent adsorption area and a second air pipe are arranged on the printing platform, the independent adsorption area is arranged in a blocking area of the tablet clamping mechanism, and the independent adsorption area is communicated with the second air pipe.

By adopting the technical scheme, the negative pressure air pipe can generate micro adsorption force on the printing stock under the action of the negative pressure air, so that the printing stock is very stable to move, the position of the printing stock is ensured to be fixed when the tabletting clamping mechanism is separated from the printing stock and the large negative pressure air draft is used for fixing the printing stock, and the positioning precision is improved. And the second air pipe can generate tiny negative pressure air which does not influence the clamping and positioning of the press sheet clamping mechanism on the printing stock in the positioning process of the printing stock, and the negative pressure air enables the position of the printing stock to be unchanged in the process of fixedly converting the printing platform from positive pressure air to negative pressure air, so that the positioning precision of the printing stock is further improved.

The screen printing machine comprises a screen printing machine main body, a lifting storage platform arranged on one side of the screen printing machine main body, a second sensor arranged on the lifting storage platform and used for controlling the height of a printing stock, a feeding mechanical arm arranged on the feeding side of the screen printing machine main body and a single printing stock separating mechanism arranged beside the lifting storage platform or on the feeding mechanical arm, wherein the feeding mechanical arm is provided with a sucker used for adsorbing the printing stock, the feeding mechanical arm reciprocates between the lifting storage platform and a printing platform on the screen printing machine main body, and the feeding mechanical arm is driven by a servo motor; the screen printing machine main body is also provided with a discharging manipulator;

the printing platform or the printing platform bracket of the screen printing machine main body is provided with a first driving mechanism;

and the second driving mechanism is arranged on a printing platform or a printing platform bracket of the screen printing machine and is used for opening and closing the upper laminating sheet of the pressing sheet clamping mechanism to finish the action of clamping the printing stock.

By adopting the technical scheme, the screen printing machine provided with the printing stock positioning device can ensure that the positioning position of the printing stock on the printing platform of the screen printing machine is more accurate when the printing stock is bent. Moreover, the screen printing of the inclined table provided with the printing stock positioning device can realize the moving positioning of the printing stock when the printing stock is bent, and the problem that the bent printing stock cannot slide downwards due to the inclined gravity is solved.

Optionally, the sheet-fed printing stock separating mechanism includes a paper separating member provided on the screen printing machine main body near the lifting storage table and two rows of blowing pipes communicated with the positive pressure air source.

By adopting the technical scheme, the blowpipe can blow away the printing stocks, then the sucking disc of the feeding manipulator sucks the topmost printing stock and lifts the topmost printing stock upwards, and in the process of lifting the printing stock, the paper separating piece separates the lower printing stock.

Optionally, the screen printing machine main part or the other first blast gate that is used for controlling material loading manipulator wind regime that is equipped with of lift storage platform, be equipped with the second blast gate that is used for controlling printing platform induced drafts in the screen printing machine main part.

Through adopting above-mentioned technical scheme, first blast gate can be used for changing the wind regime of material loading manipulator, makes the stock can break away from with material loading manipulator fast. The setting of second blast gate is used for changing induced draft or blowing of printing platform, makes the stock suspension and fixed, also can realize that the stock breaks away from with printing platform fast, and two blast gates settings have greatly shortened the stock exchange time to printing speed has been improved.

Optionally, be equipped with the telescopic pin that is used for jack-up stock on the screen printing platform of screen printing machine main part, the telescopic pin sets up in printing platform discharge manipulator one side, be equipped with the clamping jaw on the discharge manipulator, the quantity of clamping jaw is two, have the third sensor that is used for detecting whether the stock on the printing platform is taken away in the screen printing machine main part, the power supply of discharge manipulator is servo motor or step motor.

By adopting the technical scheme, the third sensor is used for detecting whether the printing stock on the printing platform is taken away or not, and transmitting a detection signal to the control system of the screen printing machine, the control system can be rapidly stopped when the control system sends a control signal to enable the screen printing machine to be in fault when the screen printing machine is in unmanned operation, and the second sensor of the printing platform also has the same rapid stopping effect.

Optionally, the printing platform or the printing head of the screen printer main body is hinged with the frame; the printing platform is obliquely arranged relative to a horizontal plane when the printing stock is fed; the screen printing machine is characterized in that a motor speed reducer is arranged on the frame of the screen printing machine main body, a crank connecting rod is arranged on the speed reducer and connected with a printing platform or a printing head of the screen printing machine main body, and the printing platform and the printing head are buckled under the driving action of the motor speed reducer.

The beneficial technical effect of this application lies in: after the stock fell on the printing platform, made last preforming of preforming fixture open and shut through using second actuating mechanism, accomplished the action of centre gripping stock, then preforming fixture makes the stock move along the printing platform upper surface under the drive action of first actuating mechanism, and then accomplishes the more accurate location of stock.

Drawings

Fig. 1 is a schematic view of the overall configuration of an object positioning device for a screen printing machine disclosed in embodiment 1 of the present application.

Fig. 2 is intended to show a mounting structure of the second drive mechanism in embodiment 1 of the present application.

Fig. 3 is a view for showing a state where the upper press sheet is lifted by the second driving mechanism in embodiment 1 of the present application.

Fig. 4 is a schematic structural view of another second drive mechanism disclosed in embodiment 1 of the present application.

Fig. 5 is intended to show the connection structure of the first air duct and the printing platform of the screen printing machine in embodiment 1 of the present application.

Fig. 6 is a schematic view of an object positioning device for a screen printing machine disclosed in embodiment 2 of the present application.

Fig. 7 is intended to show a connecting structure of the front retainer and the rotary bearing in embodiment 2 of the present application.

Fig. 8 is a schematic structural view of the object positioning device for the screen printing machine disclosed in embodiment 3 of the present application.

Fig. 9 is a schematic view of the overall structure of a screen printing machine with an object positioning device mounted thereon, which is disclosed in embodiment 4 of the present application.

Fig. 10 is intended to show a connecting structure of a reduction gear and a crank link in embodiment 4 of the present application.

Description of reference numerals:

1. a positioning member; 11. a front positioning member; 12. a side positioning member; 13. a rotating bearing; 2. a first drive mechanism; 3. a tablet clamping mechanism; 4. a second drive mechanism; 300. a notch; 31. pressing the mixture into tablets; 32. pressing the mixture downwards; 33. an independent adsorption zone; 34. a second air duct; 41. jacking a cylinder; 42. carrying out plate picking; 5. a pressure adjusting mechanism; 6. a first air duct; 7. a first sensor; 81. a screen printer main body; 811. a first air valve; 812. a second air valve; 82. lifting the material storage table; 83. a second sensor; 84. a feeding manipulator; 841. a suction cup; 85. a sheet-fed printing material separating mechanism; 851. a paper separating piece; 852. a blowpipe; 86. a discharging manipulator; 861. a clamping jaw; 87. a retractable pin; 88. a third sensor; 89. a speed reducer; 891. a crank connecting rod.

Detailed Description

The present application is described in further detail below with reference to figures 1-10.

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

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "plurality" or "a plurality" means two or more unless specifically defined otherwise.

It should be noted that, in the existing screen printing machine, as in the technology improved by the applicant, a negative pressure pull gauge is used to accurately position the printing stock, but because the negative pressure pull gauge is complex in structure and high in manufacturing cost, and the pull gauge needs to return to the negative pressure pull gauge in time when the printing stock is printed by processing a groove on a printing platform, and the printing stock can be printed by bearing the negative pressure pull gauge, the problem of low speed is caused.

The utility model provides a during stock positioner of screen printing machine for screen printing machine reforms transform original semi-automatic screen printing machine, need not do big change to the machine, stock positioner draws the rule structure with the negative pressure comparatively speaking, because the thickness of negative pressure draw the rule is big, need adopt the mounting means of inlaying to install screen printing machine's printing platform, still need process the recess that is used for installing the negative pressure on the printing platform, and printing platform's roughness requires highly, require that the upper surface of negative pressure draw the rule and printing platform upper surface error can not be greater than 0.05 millimeter, and the orbital requirement of removal of negative pressure draw the rule is also higher, otherwise can appear the unclear problem of the image of the regional printing that the negative pressure drawn the rule belongs to. Therefore, the printing stock positioner that the screen printing machine that this application embodiment discloses enables the printing stock location more accurate, and the maintenance cost is not high, is fit for current screen printing machine's transformation and popularization, has higher practicality.

Example 1

The embodiment 1 of the application discloses a printing stock positioning device for a screen printing machine, please refer to fig. 1 and 2, and the printing stock positioning device comprises a first driving mechanism 2 arranged on a printing platform or a printing platform bracket of a screen printing machine, a pressing sheet clamping mechanism 3 arranged on the upper surface of the printing platform, and a second driving mechanism 4 arranged on the printing platform or the printing platform bracket of the screen printing machine. Wherein, preforming fixture 3 includes preforming 31 and lower preforming 32, goes up preforming 31 and lower preforming 32 and is connected with the power take off end of first actuating mechanism 2, and second actuating mechanism 4 is used for making the last preforming 31 of preforming fixture 3 open and shut, accomplishes the action of centre gripping stock, and preforming fixture 3 makes the stock remove along the printing platform upper surface under the driving action of first actuating mechanism 2, makes the stock accomplish accurate location.

Specifically, the first driving mechanism 2 may be an air cylinder or an electric push rod, in the embodiment of the present application, the air cylinder is adopted as the first driving mechanism 2, and the air cylinder may be fixedly mounted on the printing platform or the printing platform bracket by using a bolt connection manner, in addition, in order to realize automatic control of the first driving mechanism 2, the first driving mechanism 2 is electrically connected to a control system of the screen printing machine, and in general, the control system of the screen printing machine is a PLC controller.

Referring to fig. 3, the pressing sheet clamping mechanism 3 includes an upper pressing sheet 31 and a lower pressing sheet 32, the upper pressing sheet 31 and the lower pressing sheet 32 can be made of metal sheets by bending, the upper pressing sheet 31 and the lower pressing sheet 32 are overlapped and are connected with the power output end of the first driving mechanism 2, i.e., the telescopic end of the cylinder, and the connection mode can be bolt connection. When the printing stock is clamped between the lower pressing sheet 32 and the upper pressing sheet 31, the control system sends a control signal to the first driving mechanism 2, so that the pressing sheet clamping mechanism 3 enables the printing stock to move along the upper surface of the printing platform under the driving action of the first driving mechanism 2.

Referring to fig. 2 and 3, the second driving mechanism 4 may be an air cylinder or an electric push rod, in this embodiment, the second driving mechanism 4 is an air cylinder, and the air cylinder may be fixedly mounted on a printing platform or a printing platform bracket of the screen printing machine by means of a bolt connection, specifically, in this embodiment, the second driving mechanism 4 is fixedly mounted on a bottom surface of the printing platform near the tablet clamping mechanism 3, correspondingly, circular holes for passing the telescopic end of the second driving mechanism 4 are formed on the upper and lower surfaces of the printing platform, the telescopic end of the second driving mechanism 4 passes through the upper surface of the printing platform and abuts against the lower surface of the upper tablet 31, of course, in order that the telescopic end of the second driving mechanism 4 does not drive the lower tablet 32 in the process of lifting up the upper tablet 31, a through hole for passing the telescopic end of the second driving mechanism 4 is also formed on the lower tablet 32, the through hole may be a kidney-shaped hole.

Referring to fig. 4, in some other embodiments of the present application, the second driving mechanism 4 includes a jacking cylinder 41 installed on a side surface of the printing platform or the printing platform bracket, and a lifting plate 42 installed on a telescopic end of the jacking cylinder 41, wherein the jacking cylinder 41 can be fixedly installed on the side surface of the printing platform or the printing sheet head bracket by using a bolt connection manner and electrically connected to a control system of the screen printing machine, the lifting plate 42 can be made of a long strip plate, one end of the lifting plate 42 can be fixedly installed on the telescopic end of the jacking cylinder 41 by using a bolt connection manner, and the other end of the lifting plate 42 is inserted between the lower pressing sheet 32 and the upper pressing sheet 31 of the pressing sheet clamping mechanism 3. After the jacking cylinder 41 receives a control signal sent by a control system of the screen printing machine, the telescopic end of the jacking cylinder 41 jacks, the lifting plate 42 is driven to ascend, the upper pressing sheet 31 is lifted by the lifting plate 42, then the first driving mechanism 2 drives the pressing sheet clamping mechanism 3 to move towards the direction close to the printing stock along the surface of the printing platform until the clamping action of the printing stock is completed, and finally the first driving mechanism 2 drives the pressing sheet clamping mechanism 3 and the printing stock to move and position along the surface of the printing platform.

Further, referring to fig. 1, in order to position the printing object on the printing platform more accurately, the printing object positioning device for the screen printing machine disclosed in the embodiment of the present application further includes a positioning member 1 disposed on the printing platform of the screen printing machine, and the positioning member 1 is used for supporting the printing object to complete the more accurate positioning of the printing object. The positioning member 1 comprises at least two front positioning members 11 and one side positioning member 12, and the front positioning members 11 and the side positioning member 12 are telescopic positioning pins. The front positioning piece 11 and the side positioning piece 12 are both embedded in the tablet clamping mechanism 3, that is, notches 300 for the top end of the positioning piece 1 to pass through are respectively arranged on the lower pressing piece 32 and the upper pressing piece 31 of the tablet clamping mechanism 3.

Referring to fig. 1, in the embodiment of the present application, the number of the object positioning devices composed of the first driving mechanism 2, the pressing piece clamping mechanism 3 and the second driving mechanism 4 is three, and the three groups are respectively two groups of object positioning devices mounted on the front side of the printing platform and one group of object positioning devices mounted on one side surface. When the printing stock is placed on the printing platform, the first driving mechanism 2 drives the pressing piece clamping mechanism 3 to extend out towards the direction close to the center of the printing platform, the second driving mechanism 4 needs to open the upper pressing piece 31 of the pressing piece clamping mechanism 3, after the printing stock is placed on the lower pressing piece 32, the second driving mechanism 4 puts down the upper pressing piece 31 of the pressing piece clamping mechanism 3, the two groups of pressing piece clamping mechanisms 3 in the printing stock positioning device on the front side of the printing platform drive the printing stock to perform front side positioning, and then the one group of pressing piece clamping mechanisms 3 in the printing stock positioning device on the side of the printing platform drives the printing stock to perform side positioning.

Further, referring to fig. 1, in order to avoid the printing stock positioning failure, a first sensor 7 is further disposed on the printing platform of the screen printing machine, and the first sensor 7 is electrically connected to a control system of the screen printing machine. Because the needle-type photoelectric switch has a small volume and can detect most of the printing materials, in this embodiment, the first sensor 7 is the needle-type photoelectric switch and is fixedly mounted on the printing platform at a position close to the positioning member 1 in a bolt connection manner.

When the printed material is positioned, the first sensor 7 can be shielded by the printed material, the first sensor 7 sends a detection signal that the printed material reaches the positioning point to the PLC, the PLC controls an air source below the printing platform to generate negative pressure air and fix the printed material on the printing platform, and then the screen printing machine sets up printing operation. On the contrary, the first sensor 7 does not send a detection signal that the printing stock reaches the designated position to the PLC controller, and the PLC controller sends a control signal and stops the screen printing machine, and simultaneously sends an alarm signal such as a voice alarm signal or a character display alarm signal of 'positioning inaccuracy'. Therefore, the first sensor 7 is provided to detect the printing material, and the printing material can be prevented from being out of position and being positioned at a wrong printing position. Of course, in order to make the detection result more accurate, the number of the first sensors 7 may be set to be plural, and generally, the number of the first sensors 7 may be three.

When the printed materials are bent and have different bending degrees, the press sheet clamping mechanism 3 is required to be used for flattening the printed materials with different bending degrees, and the pressure between the upper press sheet 31 and the lower press sheet 32 is required to be adjusted according to the printed materials with different bending degrees, so that the printed materials with different bending degrees can be flattened.

Referring to fig. 3, the pressure adjusting mechanism 5 includes a mounting plate bolted to the telescopic end of the first driving mechanism 2, a connecting plate bolted to the mounting plate, and a force applying member mounted on the connecting plate, wherein the force applying member is a spring, and the end of the force applying member abuts against the upper pressing plate 31 by adjusting the deformation amount of the spring, so that the upper pressing plate 31 approaches the lower pressing plate 32 and applies pressure to the printing material.

In other embodiments of the present application, the force applying component of the pressure adjusting mechanism 5 is an air cylinder, a telescopic end of the air cylinder contacts with a lower surface of the lower pressing piece 32, the telescopic end of the air cylinder pushes up the lower pressing piece 32 by adjusting air pressure, and the lower pressing piece 32 approaches the upper pressing piece 31 and applies pressure to the printing material.

Of course, the pressure adjusting mechanism 5 may also adopt an air cylinder, the air cylinder may be installed on the first driving mechanism 2 in a bolt connection manner, and the telescopic ends of the two air cylinders respectively apply acting forces to the upper pressing sheet 31 and the lower pressing sheet 32 from two sides to increase the pressure applied to the printing material.

It should be understood that, because the upper pressing sheet 31 of the pressing sheet clamping mechanism 3 can be repeatedly lifted and lowered in the process of printing the printing stock by the screen printing machine, generally, the actions of clamping and releasing the printing stock by the pressing sheet clamping mechanism 3 can be repeated for thousands of times every shift, and when the upper pressing sheet 31 deforms due to fatigue, a worker can use the pressure adjusting mechanism 5 to adjust the pressing sheet clamping mechanism 3, namely, the height distance between the upper pressing sheet 31 and the lower pressing sheet 32, which is inversely related to the pressure applied to the printing stock, so as to realize better pressure application to the printing stock and complete the action of clamping the printing stock.

Further, referring to fig. 5, in order to make the printing material shift when being blown up and suspended or positioned and fixed before printing, the printing material is positioned and fixed more accurately before printing. In other embodiments of example 1, the object positioning device further includes a first air duct 6, one end of the first air duct 6 is communicated with an air opening formed in the upper surface of the printing platform, the other end of the first air duct 6 is communicated with a positive pressure air source and a negative pressure air source of the screen printing machine through an exhaust hose, the object is suspended on the printing platform by positive pressure wind energy generated by the first air duct 6, and the object is adsorbed on the printing platform by negative pressure wind energy generated by the first air duct 6.

In addition, referring to fig. 2, an independent adsorption area 33 and a second air duct 34 are further arranged on the printing platform, the independent adsorption area 33 is communicated with the second air duct 34, the independent adsorption area 33 is shielded by the lower pressing sheet 32, at this time, the lower pressing sheet 32 can be made of a breathable material, the breathable material can be made of a powder metallurgy stainless steel wire mesh, correspondingly, the upper pressing sheet 31 is connected to a groove member, the groove of the groove member is communicated with negative pressure air, so that when the pressing sheet clamping mechanism 3 clamps a printing stock, the printing stock can be subjected to adsorption force generated by the negative pressure air besides pressure between the upper pressing sheet 31 and the lower pressing sheet 32, and further the positioning process of the printing stock is more stable. The second air pipe 34 is communicated with a negative pressure air source of the screen printing machine, and can generate small negative pressure air which can not influence the positioning of the printing stock by the printing stock positioning device in the printing stock positioning process, and the negative pressure air can ensure that the position of the printing stock in the printing platform is unchanged from the positive pressure air knife negative pressure air in the fixed conversion process.

When printing platform negative pressure wind source closes and the malleation wind switch-on back, the stock is blown upwards to first tuber pipe 6, make the stock suspension, the less frictional force of preforming fixture 3 of being convenient for drives the stock and carries out faster and accurate location, the location accuracy that does not deform when less frictional force stock contact locating pin is higher, close and the negative pressure wind source starts the back when malleation wind source, negative pressure wind passes through the wind gap and produces suction to the stock, make the stock fixed on printing platform, when screen printing machine printing stock, the stock is adsorbed in wind gap department, avoid the stock to take place to remove before being printed.

Example 2

Referring to fig. 6, the difference between the embodiment 2 and the embodiment 1 is that two sets of object positioning devices are arranged at intervals on the front side of the printing platform of the screen printing machine, and the two sets of object positioning devices can also be connected into a long strip. An included angle exists between the track of the two tabletting clamping mechanisms 3 arranged on the front side of the printing platform of the screen printing machine and the connecting line between the two front positioning pieces 11 along the surface movement of the printing platform, and the included angle is 3-5 degrees, 5-15 degrees, 15-25 degrees, 25-35 degrees or 35-45 degrees. In this embodiment, the included angle is set to 15 to 25 °. The arrangement is such that the locus of the movement of the first driving mechanism 2 driving the sheeting clamping mechanism 3 to clamp the printing stock is oblique relative to the connecting line between the two front positioning pieces 11, so that the printing stock moves towards the front positioning pieces 11 and the side positioning pieces 12 simultaneously.

Referring to fig. 7, after the printing stock is loaded and placed on the printing platform of the screen printing machine, the printing stock is closer to the front positioning piece 11, so the printing stock can contact two front positioning pieces 11 first, in other embodiments of the present application, the front positioning piece 11 is further provided with a rotating bearing 13, the printing stock contacts the front positioning piece 11 first, because the front positioning piece 11 is provided with the rotating bearing 13, of course, in order to install the rotating bearing 13, the lower surface of the printing platform of the screen printing machine is further provided with a linear bearing, a telescopic connecting rod for installing the rotating bearing 13 is arranged on the linear bearing in a penetrating manner, one end of the telescopic connecting rod is connected with a telescopic cylinder, and is used for pushing the telescopic connecting rod to move up and down, so as to drive the front positioning piece 11 to move up and down.

When the printing stock moves on the front positioning piece 11, the front positioning piece 11 is driven to rotate, the printing stock is driven by the pressing piece clamping mechanism 3 to continuously move towards the side positioning piece 12 and contact the side positioning piece 12, so far, three-point positioning is realized on the printing stock by the two front positioning pieces 11 and the side positioning piece 12, and the positioning speed of the printing stock is faster and more accurate. In the positioning process of stock, thereby it makes stock float to make the frictional force between stock and the printing platform reduce to blow because of screen printing machine's printing platform, and preceding setting element 11 is rotatory this moment, the friction of stock and the side of preceding setting element 11 becomes rolling friction by sliding friction, the frictional force that makes the stock receive when removing is littleer, the resistance diminishes when the stock removes, then required drive power just diminishes when the stock removes, in addition, because the stock is cliied by preforming fixture 3, the stock just is difficult for taking place crooked, even very thin stock also is difficult for taking place the deformation when the contact setting element like this, thereby higher positioning accuracy has been guaranteed, can realize thinner stock (for example thickness is 0.05mm film) accurate positioning.

Example 3

Referring to fig. 8, it is different from the above embodiment in that the number of the printing stock positioning devices is a group, and the group is installed on one side of the printing platform of the screen printing machine near the side positioning piece 12, when the printing stock is loaded on the printing platform of the screen printing machine, the printing platform is in an inclined state, because the printing platform is in the inclined state, some printing stocks with small bending degree or no bending degree can position the front side of the printing stock under the action of gravity, after the positioning of one side is completed, the first driving mechanism 2 installed in the printing stock positioning device on one side of the printing platform near the side positioning piece 12 drives the pressing sheet clamping mechanism 3 to move along the surface of the printing platform, at this time, the moving track of the printing stock positioning device is parallel to the connecting line of the two front positioning points, the pressing sheet clamping mechanism 3 drives the printing stock to position to the side positioning piece 12, and completing three-point positioning.

Example 4

Referring to fig. 9, embodiment 4 of the present application discloses a screen printing machine, which includes a screen printing machine main body 81, an elevating stocker 82 installed at one side of the screen printing machine main body 81, a second sensor 83 provided on the elevating stocker 82 for controlling the height of the printing material, a feeding robot 84 provided at an upper feeding side of the screen printing machine main body 81, a sheet-fed printing material separating mechanism 85 provided at a side of the elevating stocker 82 or on the feeding robot 84, a discharging robot 86 installed at a discharging side of the screen printing machine main body 81, and the printing material positioning device for the screen printing machine disclosed in the above embodiments.

Specifically, the screen printer main body 81 is composed of a frame, a control system installed on the frame, a power source and an air source installed at the bottom of the frame, a guide rail installed on the frame, a printing platform bracket, and a printing platform installed on the printing platform bracket, wherein air-permeable round holes are uniformly distributed on the upper surface of the printing platform. The lifting storage platform 82 can be controlled to lift by adopting a motor speed reducer or an air cylinder, the lifting storage platform 82 is used as a feeding machine of the screen printing machine main body 81, an opposite-jet type photoelectric switch is installed above the lifting storage platform 82, when printing materials are stacked on the lifting storage platform 82, in an initial state, the stacked printing materials can block the opposite-jet type photoelectric switch, the opposite-jet type photoelectric switch enables a circuit of the lifting storage platform 82 to be closed, the lifting storage platform 82 stops lifting, on the contrary, when the height of the remaining printing materials is reduced because the feeding manipulator 84 is continuously taken away, the opposite-jet type photoelectric switch is not blocked by the printing materials any more, the circuit of the lifting storage platform 82 is enabled to be switched on, or the PLC obtains a signal, the PLC sends a control signal, and the lifting motor at the bottom of the lifting storage platform is controlled to lift the lifting storage platform 82. Of course, in other possible embodiments, the opposite photoelectric switch can be replaced by a micro switch or an ultrasonic switch. The micro-gap switch sets up the top at lift storage platform 82, when the stock that piles up constantly takes away and reduces because of material loading manipulator 84, the micro-gap switch-on, the PLC controller obtains the turn-on signal, the elevating motor of PLC controller control lift storage platform 82 risees, when the micro-gap switch is pushed down to lift storage platform 82 after rising, the micro-gap switch disconnection, the PLC controller obtains the turn-off signal, PLC controller control lift storage platform 82 stops rising, ultrasonic wave switch theory of operation is the same with photoelectric switch's theory of operation, just so realize the stock height stability that piles up on lift storage platform 82, make material loading manipulator 84 steadily get the material.

The feeding manipulator 84 is also provided with a suction cup 841 for absorbing printing stocks, the feeding manipulator 84 reciprocates between the lifting storage platform 82 and a printing platform on the screen printer main body 81, and the feeding manipulator 84 is driven by a servo motor; correspondingly, the screen printer main body 81 is also provided with a discharging manipulator 86; the screen printer main body 81 is also provided with a printing stock positioning device, namely a first driving mechanism 2 is fixedly arranged on a printing platform or a printing platform bracket of the screen printer main body 81 in a bolt connection mode; the pressing piece clamping mechanism 3 is arranged on the upper surface of the printing platform, the pressing piece clamping mechanism 3 comprises an upper pressing piece 31 and a lower pressing piece 32, the upper pressing piece 31 and the lower pressing piece 32 are connected with the power output end of the first driving mechanism 2, and the pressing piece clamping mechanism 3 enables the printing stock to move along the upper surface of the printing platform under the driving action of the first driving mechanism 2; the printing platform or the printing platform bracket of the screen printer main body 81 is also provided with a second driving mechanism 4, and the second driving mechanism 4 is used for opening and closing the upper pressing sheet 31 of the pressing sheet clamping mechanism 3 to finish the action of clamping the printing stock.

The sheet separating mechanism 85 includes a paper separating member 851 provided on the screen printer main body 81 on the side close to the elevation storage table 82 and two rows of air blowing pipes 852 communicating with a positive pressure air source. The paper separating piece can be a paper separating piece or a hairbrush, and the two rows of air blowing pipes 852 are arranged at positions, which are higher than the printing stock, beside the lifting storage platform 82 in an up-and-down distribution mode. The stack of printing materials is blown away by the lower row of air blowing pipes 852, the uppermost printing material is sucked by the suction cups 841 of the feeding manipulator 84, then the printing materials are lifted upwards, the printing materials pass through the paper passing part 851 in the process of being lifted, the printing materials attached to the lower part are pulled off, the upper row of air blowing pipes 852 blow air to the lower surface of the lifted printing materials, and the single printing materials are separated from the storage table.

In another possible embodiment of the present application in embodiment 4, two independent air cylinders may be installed on the feeding manipulator 84, each of which is attached with a row of suction nozzles, and the two independent air cylinders move up and down in different directions, i.e. the printing material bends up and down to drop off the printing material attached below, thereby completing the operation of separating the single printing material from the lifting and lowering stocker 82.

In order to separate the single printing stocks, the suction cups 841 of the feeding manipulator 84 can be used for sucking the printing stocks, then the printing stocks on the upper side are knocked to make the printing stocks on the lower side fall off, and the equipment for completing the knocking action can be a vibrating motor or an air cylinder, thereby completing the operation of separating the single printing stocks.

Referring to fig. 9 and 10, since the suction cups 841 of the feeding manipulator 84 suck the printing material to move to a predetermined position on the printing platform of the main body 81 of the screen printing machine, typically a position where the distance between the printing material and the positioning member 1 is 2 to 5mm, and at this time, it is required to quickly discharge the printing material onto the printing platform, a first air valve 811 for controlling the air source of the feeding manipulator 84 is further installed on the main body 81 of the screen printing machine, and the first air valve 811 is respectively communicated with the positive air source and the negative air source of the main body 81 of the screen printing machine by two air chambers, but in other embodiments of the present application, the first air valve 811 may also be installed beside the lifting storage table 82, and when the printing material is moved to a predetermined position on the printing platform, the air source connected with the first air valve 811 is quickly switched from the negative air source to the positive air source, so that the sucking force on the printing material is quickly converted into blowing force, so that the printing stock is released to the printing platform quickly. It should be noted that when the printed material is released above the printing platform, the first air valve 811 is instantly connected to the positive pressure air source, and the negative pressure air source is connected in other time, the first air valve 811 may also only control the on-off of the negative pressure air source, and then the electromagnetic valve is installed to supply another path of compressed air to the feeding manipulator 84, and the compressed air is blown at the moment when the negative pressure air source is cut off to release the printed material. In addition, a single solenoid valve can be used for controlling, when the printing stock is released, a large amount of compressed air is blown in instantly to achieve a state of releasing vacuum, and then the feeding manipulator 84 is enabled to release the printing stock. Similarly, in order to enable the printing stock to be quickly converted from being adsorbed on the printing platform of the screen printer main body 81 to be separated from the printing platform, a second air valve 812 used for controlling the air suction of the printing platform is further installed on the screen printer main body 81, and the second air valve 812 can be quickly controlled to switch the negative pressure air source for supplying air to the printing platform into the positive pressure air source.

The discharging manipulator 86 is composed of a guide rail arranged on the rack beside the screen printer body 81 and a discharging hand connected on the guide rail in a sliding manner, a clamping jaw 861 is arranged on the discharging manipulator 86, the clamping jaw 861 can be fixedly connected with the discharging hand in a bolt connection manner, the number of the clamping jaws 861 is two, the clamping jaws 861 can be pneumatic fingers, compressed air is provided by an air compressor, and the electromagnetic valve is used for controlling the clamping jaws 861 to complete the action of grabbing the printing stock. And, for making the stock break away from with the printing platform of screen printing machine main part 81 fast, avoid the stock to adsorb on printing platform after accomplishing the printing operation, still be provided with telescopic pin 87 on screen printing machine main part 81's printing platform, telescopic pin 87 can adopt the cylinder drive, after the stock printing is accomplished, when PLC controller control printing platform and print head were opened, cylinder drive telescopic pin 87 jack-up stock, after the print head was opened, unloading manipulator 86 slides along the guide rail, and press from both sides the stock and take out the stock after the printing was accomplished, in the in-process that the stock was taken out, for detecting the stock and whether taken away, still install the third sensor 88 that is used for detecting the stock on the printing platform and whether taken away on screen printing machine main part 81, third sensor 88 can be photoelectric switch, ultrasonic switch or proximity switch. When the third sensor 88 detects that the printing stock is not taken away, the PLC outputs a control signal to control the screen printing machine to stop working after receiving the signal, so that the function of automatic fault shutdown under unmanned control is realized.

Furthermore, the power source of the unloading manipulator 86 can adopt a servo motor or a stepping motor, because the starting of the servo motor or the stepping motor is fast to stop, and the running position is accurate, thereby ensuring the accurate and high-speed running of the whole screen printing machine.

Referring to fig. 10, in some embodiments of example 4, a printing platform or a printing head of a screen printer main body 81 is hinged to a frame, the printing platform is disposed in an inclined manner with respect to a horizontal plane during feeding of printing materials, a speed reducer 89 is further bolted to a position below the printing platform on the frame of the screen printer main body 81, a motor is connected to the speed reducer 89, a crank link 891 is fixedly mounted to a power output end of the speed reducer 89, one end of the crank link 891, which is far away from the speed reducer 89, is connected to the printing platform or the printing head of the screen printer main body 81, and the printing platform and the printing head can be engaged under the driving action of the speed reducer 89.

When the motor is electrified and started, the speed reducer 89 is driven to move, because the speed reducer 89 has the advantage of quick start and stop, the motion form is uniform acceleration motion when the crank connecting rod 891 is driven by the motor and the speed reducer 89 to operate, the motion form is uniform deceleration motion when the speed reducer stops, the crank connecting rod 891 is in rigid mechanical connection, the motion close to zero clearance (only the play of a rotating bearing) is very stable, the limit position of the top end of the crank connecting rod 891 is accurately positioned, almost no error exists when the relative position of a printing head on the screen printer main body 81 and a printing platform is positioned, no shake exists, the printing platform is buckled with the printing head, then the printing operation of a printing stock is started, after the printing is finished, the printing platform falls or the printing head rises, a telescopic cylinder on the printing platform stretches out to jack up the finished product printed by the printing stock for the unloading manipulator 86 to grab, and the finished product is clamped on a subsequent conveyor belt, the conveyor belt conveys the printed product into a dryer, or the finished product is clamped on a subsequent receiving platform by a discharging manipulator 86, the manipulator at the feeding side and the manipulator at the taking side on the receiving platform are controlled by servo motors, and an operator collects the printed product on the drying rack.

The above are preferred embodiments of the present application, and the scope of protection of the present application is not limited thereto, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A substrate positioning device for a screen printing machine, comprising:

the first driving mechanism (2) is arranged on a printing platform or a printing platform bracket of the screen printing machine;

the pressing piece clamping mechanism (3) is arranged on the upper surface of the printing platform, the pressing piece clamping mechanism (3) comprises an upper pressing piece (31) and a lower pressing piece (32), the upper pressing piece (31) and the lower pressing piece (32) are connected with the power output end of the first driving mechanism (2), and the pressing piece clamping mechanism (3) enables a printing stock to move along the upper surface of the printing platform under the driving action of the first driving mechanism (2); and

and the second driving mechanism (4) is arranged on a printing platform or a printing platform bracket of the screen printing machine and is used for opening and closing the upper pressing sheet (31) of the pressing sheet clamping mechanism (3) to finish the action of clamping the printing stock.

2. The object positioning device for screen printing machines according to claim 1, further comprising:

the positioning piece (1) is arranged on a printing platform of the screen printing machine and used for positioning a printing stock;

the positioning element (1) comprises at least two front positioning elements (11) and one side positioning element (12); the front positioning piece (11) and the side positioning piece (12) are telescopic positioning pins; the positioning pin and the tablet pressing clamping mechanism (3) are embedded; a rotary bearing (13) is arranged on the front positioning piece (11); the printing platform of the screen printing machine is also provided with a first sensor (7) for detecting whether the printing stock reaches the designated position.

3. The object positioning device for a screen printing machine according to claim 2, wherein: an included angle exists between the moving track of the tablet clamping mechanism (3) and the connecting line between the two front positioning pieces (11), and the included angle is 3-5 degrees, 5-15 degrees, 15-25 degrees, 25-35 degrees or 35-45 degrees.

4. The object positioning device for a screen printing machine according to claim 1 or 2, characterized in that: the printing stock positioning device is provided with a plurality of groups and moves towards different directions to complete the positioning of the printing stock.

5. The object positioning device for a screen printing machine according to claim 2, wherein: the printing platform is obliquely arranged during feeding, and the printing stock positioning devices are provided with a group; and the moving track of the printing stock positioning device is parallel to the connecting line of the two front positioning points.

6. The object positioning device for screen printing machines according to claim 1, further comprising:

a pressure adjusting mechanism (5) for applying a force to the upper pressing plate (31) and/or the lower pressing plate (32); and the force application component of the pressure adjusting mechanism (5) is an air cylinder or a spring.

7. The object positioning device for a screen printing machine according to claim 1, further comprising:

one end of the first air pipe (6) is communicated with an air port arranged on the printing platform, and the other end of the first air pipe is communicated with a positive pressure air source and a negative pressure air source of the screen printing machine, so that the printing stock is suspended or fixed on the printing platform; in addition, an independent adsorption area (33) and a second air pipe (34) are arranged on the printing platform, the independent adsorption area (33) is arranged in a blocking area of the tablet pressing and clamping mechanism (3), and the independent adsorption area (33) is communicated with the second air pipe (34).

8. A screen printing machine is characterized by comprising a screen printing machine main body (81), a lifting storage table (82) arranged on one side of the screen printing machine main body (81), a second sensor (83) arranged on the lifting storage table (82) and used for controlling the height of a printed material, a feeding manipulator (84) arranged on the feeding side of the screen printing machine main body (81), and a printed material sheet separating mechanism (85) arranged beside the lifting storage table (82) or on the feeding manipulator (84), wherein a suction cup (841) used for adsorbing the printed material is arranged on the feeding manipulator (84), the feeding manipulator (84) reciprocates between the lifting storage table (82) and a printing platform on the screen printing machine main body (81), and the feeding manipulator (84) is driven by a motor; the screen printing machine main body (81) is also provided with a discharging manipulator (86);

the printing platform or the printing platform bracket of the screen printer main body (81) is provided with a first driving mechanism (2);

and the second driving mechanism (4) is arranged on a printing platform or a printing platform bracket of the screen printing machine and is used for opening and closing the upper laminating sheet of the pressing sheet clamping mechanism (3) to finish the action of clamping the printing stock.

9. The screen printing machine according to claim 8, wherein: the sheet-fed printing stock separating mechanism (85) comprises a paper separating piece (851) arranged on one side of the screen printing machine main body (81) close to the lifting storage table (82) and two rows of air blowing pipes (852) communicated with a positive pressure air source.

10. The screen printing machine according to claim 8, wherein: the screen printing machine is characterized in that a first air valve (811) used for controlling an air source of a feeding manipulator (84) is arranged beside the screen printing machine main body (81) or the lifting storage table (82), and a second air valve (812) used for controlling air suction of the printing platform is arranged on the screen printing machine main body (81).

11. The screen printing machine according to claim 8, wherein: the screen printing machine is characterized in that a telescopic pin (87) used for jacking printing stocks is arranged on a screen printing platform of the screen printing machine body (81), the telescopic pin (87) is arranged on one side of an unloading manipulator (86) of the printing platform, clamping jaws (861) are arranged on the unloading manipulator (86), the number of the clamping jaws (861) is two, a third sensor (88) used for detecting whether the printing stocks on the printing platform are taken away or not is arranged on the screen printing machine body (81), and a power source of the unloading manipulator (86) is a servo motor or a stepping motor.

12. The screen printing machine according to claim 8, wherein: the printing platform or printing head of the screen printer main body (81) is hinged with the frame; the printing platform is obliquely arranged relative to a horizontal plane when the printing stock is fed; be equipped with speed reducer (89) in the frame of screen printing machine main part (81), be equipped with crank connecting rod (891) on speed reducer (89), crank connecting rod (891) are connected with the printing platform or the print head of screen printing machine main part (81), make printing platform and print head lock under speed reducer (89) drive action.