CN211662803U - Screen printing device - Google Patents

Abstract

The utility model discloses a screen printing device, comprising a swing arm, a printing fixing frame, a scraping mechanism and a wiping mechanism. The printing fixing frame is slidably assembled on the swing arm and can move along the length direction of the swing arm. The scraping mechanism is connected with the wiping mechanism. The feeding mechanism is installed on the printing fixture and can be lifted and lowered. The wiping mechanism is used to evenly spread the paint on the printing plate. The scraping mechanism includes a scraper fixed seat, a rubber scraper, and a rotating part. The scraper fixed seat is perpendicular to the swing arm and Set horizontally, the rubber scraper is installed on the scraper fixing seat, the scraper fixing seat can rotate along its length direction with a fixed axis and the rotation can expand the vertical projection area of the rubber scraper, the rotating part is assembled on the scraper fixing seat and can limit the scraping. The maximum rotation angle of the plate holder. The beneficial effect of the utility model is that the actual contact area between the squeegee and the printing plate can be adjusted, and a better printing effect can be achieved in coordination with the descending depth of the squeegee.

Description

A screen printing device

technical field

The utility model relates to a printing device, in particular to a screen printing device.

Background technique

Screen printing is currently widely used in various types of printed matter. Screen printing is composed of five elements, printing plate, squeegee, paint, and printing table. The printing plate is printed on the basic principle that the hollow pattern can pass through the paint, and the non-graphic part cannot pass through the paint. When printing, pour paint on one end of the screen printing plate, apply a certain pressure to the ink part on the screen printing plate with a scraper, and move at a constant speed towards the other end of the screen printing plate, the paint is removed by the scraper during the movement. Part of the mesh is extruded onto the print. In the existing screen printing machine, the printing device usually uses a combination of a squeegee and a wiping plate. The squeegee first scrapes the uniform paint on the printing plate to the hollow pattern when the printing device moves forward, and when the scraping ends, the paint is scraped. Lateral accumulation, then the scraper is raised, the wiping board is pressed down, and then the printing device moves in the reverse direction, and the wiping board evenly wipes the paint on the printing board to complete a cycle. This printing device has the following defects: for different types of printed materials, such as textiles, rubber products, plastic products, the coatings used are not the same, especially different coatings have different viscosity, density, fineness, etc. The actual contact area and contact strength of the squeegee and the printing plate also have different requirements, and the pattern on the printing plate is determined by the hole size and shape of the hollow pattern. For different hole sizes, the contact area between the squeegee and the printing plate also has an impact.

Utility model content

The technical problem to be solved by the utility model is to provide a screen printing device, which can adjust the actual contact area between the squeegee and the printing plate, and can achieve a better printing effect in coordination with the descending depth of the squeegee.

The utility model is realized by the following technical solutions.

A screen printing device includes a swing arm, a printing fixing frame, a scraping mechanism, and a material wiping mechanism, the printing fixing frame is slidably assembled on the swing arm and can move along the length direction of the swing arm, and the scraper Both the mechanism and the wiping mechanism are installed on the printing fixing frame and can be raised and lowered. The wiping mechanism is used to evenly spread the paint on the printing plate. The scraper fixing seat is perpendicular to the swing arm and is arranged horizontally, the rubber scraper is mounted on the scraper fixing seat, and the scraper fixing seat can be rotated along its longitudinal axis and the rotation can The vertical projection area of the rubber scraper is enlarged, and the rotating part is assembled on the scraper fixing seat and can limit the maximum rotation angle of the scraper fixing seat.

Further, both sides of the printing fixing frame are provided with scraper lifting cylinders, the piston rods of the scraper lifting cylinders are vertically arranged, and there are two rotating parts, which are respectively fixed on the two pistons. The two ends of the scraper fixing seat are respectively hinged to the two rotating parts.

Further, the rotating part includes a fixed panel, a bearing, and a stopper, the bearing is installed on the fixed panel, and the fixed panel is fixed on the piston rod and is perpendicular to the length of the scraper fixing seat Direction, both ends of the scraper fixing seat are provided with rotating shafts, the rotating shafts are mounted on the bearings of the fixed panel, and the rotating shaft is partially located on the outer end face of the fixed panel and this part is sleeved and fixed with A positioning ring, the positioning ring has a positioning piece, the stopper is fixed on the outer end surface of the fixing panel, and the positioning piece rotates with the scraper fixing seat and can be in contact with the stopper.

Further, the rotating part also includes an initial position piece, the initial position piece is fixed on the fixed panel, when the initial position piece is in contact with the positioning piece, the vertical projected area of the rubber scraper is the smallest, and The top of the rubber scraper is inclined toward the scraping direction.

Further, the rotating shaft is equipped with an elastic reset member, two ends of the elastic reset member are respectively connected to the rotating shaft and the fixed panel, and the elastic reset member has the function of driving the rotating shaft to make the positioning member close to the initial position. Rotate in the direction of the position piece.

Further, the elastic reset member is set as a flat scroll spring, the inner end of the flat scroll spring is fixed on the rotating shaft, and is located between the fixed panel and the scraper fixing seat, and the flat scroll spring is The outer end of the coil spring is fixed on the fixing panel.

Further, the fixing panel is provided with an adjustment groove, the stopper has a rod located in the adjustment groove and slidingly matched with it, the rod has a thread and a locking nut is provided for fixing the stopper in the adjustment groove. The position of the adjustment slot, when the stopper is in contact with the positioning piece, is the maximum rotation angle of the scraper fixing seat, and the maximum rotation angle varies with the different positions of the stopper in the adjustment slot. Change.

Further, the bottom end surface of the scraper fixing seat is fixedly connected with a scraper holding seat, the scraper holding seat has a holding groove with an open bottom, and the upper part of the rubber scraper is located in the holding groove And it is clamped and fixed by the scraper fixing seat.

Further, the scraper fixing seat has a rectangular body structure, the top of the scraper clamping seat is flat and is close to the bottom end surface of the scraper fixing seat, and the scraper fixing seat is provided with at least two fixed The left arm and the right arm of the fixing piece are fixedly connected with the two side end faces of the scraper fixing seat, and the bottoms of the left arm and the right arm of the fixing piece are both connected with the bottom of the scraper holding seat The two side end faces are in close contact.

Further, the top of the scraper clamping seat is located on the left arm and the right arm of the fixing member, both of which are provided with a wrapping structure, and the wrapping structure is close to the two sides of the scraper fixing seat. The lower parts of the left arm and the right arm each have a concave surface that spans the wrapping structure.

The beneficial effects of the present utility model:

Using the rubber scraper as the execution part of the scraper realizes the reversible bending and deformation of the scraper. By setting the rotating parts, the scraper holder and the rubber scraper can be rotated, and the scraper lifting cylinder can be used for different printed matters. It requires different contact areas and contact strengths between the rubber squeegee and the printing plate, and can be applied to coatings with arbitrary characteristics and hollow patterns of arbitrary shapes, which improves the types of prints that can be processed, and has strong adaptability compared to the prior art, and The printing effect is better.

Description of drawings

1 is a schematic front view of a screen printing device;

Figure 2 is a front view of the internal structure of the swing arm;

Figure 3 is a schematic structural diagram of a swing arm and a printing fixture;

Figure 4 is a schematic front view of the scraping mechanism and the wiping mechanism;

Fig. 5 is the partial enlarged schematic diagram of Fig. 4;

6 is a side sectional view of the fixed panel and the rotating shaft;

Figure 7 is a side cross-sectional view of the stop;

FIG. 8 is a schematic structural diagram of a scraper fixing seat and a scraper holding seat.

Detailed ways

The utility model will be described in further detail below according to the accompanying drawings and embodiments.

1-8, a screen printing device includes a swing arm 1, a printing fixture 2, a scraping mechanism 3, and a wiping mechanism 4, the printing fixture 2 is slidably assembled on the swing arm 1 and can be Moving along the length direction of the swing arm 1, the scraping mechanism 3 and the scraping mechanism 4 are both installed on the printing fixing frame 2 and can be lifted and lowered, and are located in the scraping mechanism 3 and the scraping mechanism 4. The printing plate 900 is arranged below the printing plate 900, and the printing plate 900 has a hollow pattern. The screen printing device prints the paint located on the printing plate 900 through the hollow pattern through the scraping mechanism 3 and the wiping mechanism 4. On the printed matter attached to the bottom surface of the printing bar . The specific operation is to spread the paint evenly on the surface of the printing plate 900. First, the scraping mechanism 3 descends to contact with the printing plate 900, the printing fixing frame 2 moves forward, the scraping mechanism 3 scrapes the paint, and the paint is about to pass through the hollow pattern. Printed on the printed matter, when the printing is completed, the paint is pushed by the scraping mechanism 3 to the key point of its stroke and is in a piled state. At this time, the scraping mechanism 3 is raised and the wiping mechanism 4 is lowered, and the printing fixing frame 2 moves in the reverse direction. The smearing mechanism 4 evenly wipes the accumulated paint on the surface of the printing plate 900 along with the movement. After the paint is completed, the smearing mechanism 4 is lifted up to complete a cycle. Typically, a single print requires two to three cycles to complete the screen printing process. In terms of function, the wiping mechanism 4 is used to evenly spread the paint on the printing plate 900 , and the scraping mechanism 3 is used to scrape the paint and print the paint on the printed matter through the hollow pattern of the printing plate 900 .

The printing fixture 2 is a component that drives the scraping mechanism 3 and the wiping mechanism 4 to reciprocate. The middle of the printing fixture 2 is provided with two sets of rollers 21, each of which has two The printing fixtures 2 are arranged side by side in the longitudinal direction, the rollers 21 are parallel to the printing fixtures 2, and are mounted on the printing fixtures 2 through a fixed shaft. The front and rear ends of the swing arm 1 are respectively provided with The transmission wheel 11 and the assembled transmission chain 12, one of the transmission wheel 11 is connected to an external power source, the bottom surface of the swing arm 1 is provided with two sliding grooves 10, and the two rollers 21 of the same group are respectively located in one of the sliding grooves 10. slot 10, the transmission chain 12 is located between the two chute 10, one side of the roller 21 is driven by the transmission chain 12 and the other side slides with the swing arm 1, driven by a power source, Then, the reciprocating bidirectional movement of the printing fixing frame 2 can be realized.

The wiping mechanism 4 includes two wiping lifting cylinders 41, a wiping fixing seat 42, and a wiping plate 43. The two wiping lifting cylinders 41 are arranged on both sides of the printing fixing frame 2, and the wiping is fixed. Both ends of the seat 42 are fixed on the piston rod of the wiping lift cylinder 41 , and the wiping plate 43 is fixedly installed on the wiping fixing seat 42 .

The scraping mechanism 3 includes a scraper fixing seat 31 , a rubber scraper 32 , a rotating part 33 , a scraper holding seat 34 , and two scraper lifting cylinders 35 . The rubber squeegee 32 is used to scrape the paint, and the contact state of the rubber squeegee 32 and the printing plate 900 is different according to the difference of the paint and the hole size of the hollow pattern of the printing plate 900 , and the rubber squeegee 32 may be different. With slight contact with the printing plate 900, it is also possible that the rubber squeegee 32 is in close contact with the printing plate 900 and the rubber squeegee 32 is deformed accordingly. Therefore, for the rubber scraper 32, its material needs to have good elastic properties to cope with deformation and deformation reversible properties. Due to long-term repeated use, it also needs good wear resistance and anti-aging properties. To sum up the above performance requirements , The rubber scraper 32 is made of cis-butadiene rubber. The cis-butadiene rubber is obtained by solution polymerization of butadiene. The cis-butadiene rubber has particularly excellent cold resistance, wear resistance and good aging resistance. Most of butadiene rubber is used in the production of tires, and a small part is used in the manufacture of cold-resistant products, cushioning materials, tapes, rubber shoes, etc. The disadvantage of cis-butadiene rubber is that the tear resistance is poor, and the anti-wet sliding performance is not good. .

The scraper holder 31 is used as the main body connecting part of the scraper mechanism 3 , and the scraper holder 34 is used as a part for installing the rubber scraper 32 and connecting the scraper holder 31 . The plate fixing seat 31 is perpendicular to the swing arm 1, and the scraper fixing seat 31 is arranged horizontally. The seat 34 has a clamping groove 341 with an open bottom, and the upper part of the rubber scraper 32 is located in the clamping groove 341 and is clamped and fixed by the scraper fixing seat 31 . For the connection of the scraper holder 31 and the scraper holder 34 , the scraper holder 31 has a rectangular structure, and the top of the scraper holder 34 is flat and is fixedly connected to the scraper holder The bottom end face of 31 can be connected by setting screws. The scraper fixing base 31 is provided with two fixing pieces 311 , the fixing piece 311 is composed of a left arm 3111 , a right arm 3112 and a middle part 3113 , the middle part 3113 is arranged horizontally and is perpendicular to the length of the scraper fixing base 31 The top of the left arm 3111 and the right arm 3112 are respectively fixed at both ends, and the left arm 3111 and the right arm 3112 of the fixing member 311 are connected to the scraper. The two side end faces of the board fixing seat 31 are fixedly connected by setting screws 3114 . The number of the fixing pieces 311 is mainly set in consideration of the actual length of the scraper fixing seat 31 , and usually not less than two. The bottoms of the left arm 3111 and the right arm 3112 of the fixing member 311 are in close contact with the two side end surfaces of the scraper holder 34 . Since the clamping groove 341 of the scraper clamping base 34 is installed by clamping the rubber scraper 32 , the clamping groove 341 can be tightly contacted with the rubber scraper 32 through the close contact of the fixing member 311 The clamping force of the scraper 32 is always achieved by the synergistic effect of the fixing member 311 , so as to avoid the loosening of the clamping groove 341 after long-term use, thereby causing the sliding dislocation of the rubber scraper 32 .

In addition, a wrapping structure 342 is provided on the left arm 3111 and the right arm 3112 of the fixing member 311 at the top of the scraper holding seat 34. The wrapping structure 342 is in the shape of an angle steel, and is clamped by the scraper. The top of the holder 34 extends to both sides and is bent vertically upward, the wrapping structure 342 is close to the two sides of the scraper fixing seat 31 , and the lower parts of the left arm 3111 and the right arm 3112 of the fixing member 311 both have across the concave surface of the wrapping structure 342 . By arranging the wrapping structure 342, the jitter of the scraper holding seat 34 in the direction perpendicular to the length of the scraper mounting seat 31, that is, the scraping direction, can be reduced in a manner of being close to the two sides of the scraper fixing seat 31, thereby improving the holding of the scraper. The structural stability of the seat 34 and the cooperation of the fixing member 311 can enhance the stability and installation firmness of the rubber scraper 32 .

Both sides of the printing fixing frame 2 are provided with the scraping lifting cylinder 35, the piston rod of the scraping lifting cylinder 35 is vertically arranged, and there are two rotating parts 33, which are respectively fixed and installed in the two positions. The piston rod, the two ends of the scraper fixing seat 31 are hinged to the two rotating parts 33 respectively. The rotating part 33 is a part that controls the inclination of the rubber scraper 32. The scraper fixing seat 31 can be rotated along its longitudinal axis and the rotation can expand the vertical projection area of the rubber scraper 32. The part 33 limits the maximum rotation angle of the blade holder 31 .

The properties of the printed paints used in different prints are different, especially in terms of viscosity and density. Therefore, the contact strength and contact area between the rubber squeegee 32 and the printing plate 900 required by the printing operation of different paints are different. The size of the holes in the hollow pattern of the plate 900 also has requirements on the contact area of the rubber scraper 32 . The stroke of the scraper lift cylinder 35 determines the pressing depth of the rubber scraper 32, and the rotating part 33 determines the inclination of the rubber scraper 32 after it is rotated when it is pressed down. The combination of these two motions determines the rubber scraper 32. The contact strength and contact area of the board 32 and the printed board 900 .

For the rotating part 33 , the rotating part 33 includes a fixed panel 331 , a bearing 332 , a stopper 333 , and an initial position piece 334 . The fixed panel 331 is fixedly installed on the piston rod and is perpendicular to the scraper fixing seat 31 The middle of the fixing panel 331 is connected with the piston rod setting screw 3311, and the upper part of the fixing panel 331 is provided with a positioning groove 3312, and a fastening screw 3313 is set in the positioning groove 3312 The fixing panel 331 is fixedly connected with the piston rod, the positioning groove 3312 is in the shape of a laterally extending arc, which is convenient for fine-tuning the direction of the fixing panel 331 during installation and fixing, and the outer end of the fastening screw 3313 is provided with a rotating handle 3314 To facilitate the operation of tightening the tightening screws 3313, both ends of the scraper fixing base 31 are provided with rotating shafts 310, the bearing 332 is installed on the fixing panel 331, and the rotating shaft 310 is installed on the fixing panel 331 the bearing 332, and the rotating shaft 310 is partially located on the outer end face of the fixing panel 331, and a positioning ring 335 is sleeved and fixed on this part. Fixed on the rotating shaft 310 , the positioning ring 335 has a positioning member 3351 , the stopper 333 is fixed on the outer end surface of the fixed panel 331 , and the positioning member 3351 rotates with the scraper fixing seat 31 to be able to connect with each other. The stopper 333 is in contact, and the initial position member 334 is fixed on the fixing panel 331. When the initial position member 334 is in contact with the positioning member 3351, the vertical projected area of the rubber scraper 32 is the smallest. And the top of the rubber scraper 32 is inclined toward the scraping direction. The positioning member 3351 has a stroke defined by the initial position member 334 and the stopper 333 , that is, determines the maximum rotation angle of the blade holder 31 and the rubber blade 32 .

The rotating shaft 310 is equipped with an elastic restoring member 3101, two ends of the elastic restoring member 3101 are respectively connected to the rotating shaft 310 and the fixing panel 331, and the elastic restoring member 3101 has the function of driving the rotating shaft 310 to the positioning member. 3351 rotates in the direction close to the initial position member 334 . The setting of the elastic reset member 3101 is to make the squeegee holder 31 and the rubber squeegee 32 always have a tendency to turn to the initial position. reset.

In this embodiment, the elastic restoring member 3101 is set as a flat scroll spring, and the inner end of the flat scroll spring is fixed on the rotating shaft 310 and is located between the fixing panel 331 and the scraper fixing seat 31 In between, the outer end of the flat scroll spring is fixed on the fixing panel 331 .

For different paint rubber scrapers 32, the required maximum rotation angles are different, so the fixing panel 331 is provided with an adjustment groove 336, and the stopper 333 has a rod 3331 located in the adjustment groove 336 and slidingly matched with it, so The rod 3331 has a thread and is provided with a lock nut 3332 for fixing the position of the stopper 333 in the adjustment groove 336 . When the stopper 333 is in contact with the positioning piece 3351 , the scraper is fixed. The maximum rotation angle of the seat 31 varies with the different positions of the stopper 333 in the adjustment groove 336 .

The above-mentioned embodiments are only intended to illustrate the technical concept and characteristics of the present invention, and the purpose thereof is to enable those skilled in the art to understand the content of the present invention and implement it, and cannot limit the protection scope of the present invention. All equivalent changes or modifications made according to the spirit of the present invention shall be covered within the protection scope of the present invention.

Claims (10)

1. A screen printing device comprises a swing arm, a printing fixing frame, a scraping mechanism and a smearing mechanism, the printing fixing frame is slidably assembled on the swing arm and can move along the length direction of the swing arm, the scraping mechanism and the smearing mechanism are both arranged on the printing fixing frame and can be lifted, the smearing mechanism is used for evenly smearing the coating on the printing plate, it is characterized in that the scraping mechanism comprises a scraper fixing seat, a rubber scraper and a rotating part, the scraper fixing seat is vertical to the swing arm and is horizontally arranged, the rubber scraper is arranged on the scraper fixing seat, the scraper fixing seat can be fixed in axis and rotate along the length direction of the scraper fixing seat, the vertical projection area of the rubber scraper can be enlarged through the rotation, the rotating component is assembled on the scraper fixing seat and can limit the maximum rotating angle of the scraper fixing seat.

2. The screen printing device according to claim 1, wherein two sides of the printing fixing frame are provided with scraping lifting cylinders, piston rods of the scraping lifting cylinders are vertically arranged, two rotating parts are arranged and fixedly installed on the two piston rods respectively, and two ends of the scraper fixing seat are hinged to the two rotating parts respectively.

3. The screen printing device according to claim 2, wherein the rotating member includes a fixing panel, a bearing, and a stop member, the bearing is installed on the fixing panel, the fixing panel is fixedly installed on the piston rod and perpendicular to the length direction of the scraper fixing seat, both ends of the scraper fixing seat are provided with rotating shafts, the rotating shafts are installed on the bearing of the fixing panel, the rotating shaft is partially located on the outer end face of the fixing panel and is fixedly sleeved with a positioning ring, the positioning ring has a positioning member, the stop member is fixed on the outer end face of the fixing panel, and the positioning member can contact with the stop member along with the rotation of the scraper fixing seat.

4. The screen printing apparatus according to claim 3, wherein the rotating member further includes a home member fixed to the fixed panel, a vertical projection area of the squeegee is smallest when the home member is in contact with the positioning member, and a top of the squeegee is inclined in a direction of scraping.

5. The screen printing device according to claim 4, wherein the rotating shaft is provided with an elastic reset member, two ends of the elastic reset member are respectively connected with the rotating shaft and the fixed panel, and the elastic reset member drives the rotating shaft to rotate in a direction that the positioning member approaches the initial member.

6. The screen printing device according to claim 5, wherein the elastic return member is provided as a flat spiral spring, an inner end of the flat spiral spring is fixed to the rotary shaft and is located between the fixed panel and the squeegee fixing base, and an outer end of the flat spiral spring is fixed to the fixed panel.

7. The screen printing apparatus according to claim 3, wherein the fixing panel is provided with an adjustment groove, the stopper has a rod member which is located in the adjustment groove and slidably engaged therewith, the rod member has a screw thread and is provided with a lock nut for fixing a position of the stopper in the adjustment groove, and the stopper is a maximum rotation angle of the squeegee fixing base when contacting the positioning member, the maximum rotation angle being changed depending on positions of the stopper in the adjustment groove.

8. The screen printing device according to claim 1, wherein a squeegee holding base is fixedly connected to a bottom end face of the squeegee holding base, the squeegee holding base having a holding groove with an open bottom, and an upper portion of the rubber squeegee is located in the holding groove and held by the squeegee holding base.

9. The screen printing device according to claim 8, wherein the squeegee holder has a rectangular structure, the top of the squeegee holder is flat and closely attached to the bottom end surface of the squeegee holder, the squeegee holder is provided with at least two fixing members, the left arm and the right arm of each fixing member are fixedly connected to the two side end surfaces of the squeegee holder, and the bottoms of the left arm and the right arm of each fixing member are closely contacted to the two side end surfaces of the squeegee holder.

10. The screen printing device according to claim 9, wherein the left arm and the right arm of the fixing member on the top of the scraper holding seat are provided with wrapping structures, the wrapping structures are tightly attached to two side surfaces of the scraper fixing seat, and the lower parts of the left arm and the right arm of the fixing member are provided with concave surfaces crossing over the wrapping structures.

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