Dual-purpose printing equipment

Abstract

The invention discloses a dual-purpose printing device, which includes a magnetic table, a replaceable printing plate and a scraping device. The printing plate is either a round screen or a hollow gravure roller. When the printing plate is a hollow gravure roller, the gravure roller is a metal cylinder with no openings on the surface and a thickness of 0.5 to 1 mm. A scraper mechanism is installed on the outside of the gravure roller. A supporting roller bracket is fixedly installed inside the gravure roller along the axial direction of the gravure roller. The two axial ends of the supporting roller are fixedly installed on the supporting roller bracket through a connecting plate. The supporting roller is tangent to the inner wall of the gravure roller where the outer wall of the scraper and the gravure roller abut. The invention, on the basis of not changing the following components of the guide belt of the round screen printing machine on the production line, sets a gravure roller that can replace the round screen and a scraper assembly matched with the gravure roller at the installation station of the round screen. The transformation cost is low and the production line is optimized, so that the existing production line can flexibly switch the printing plate according to production needs.

Description

Technical Field

[0001] The invention relates to the field of textile machinery and equipment, in particular to a dual-purpose printing equipment. Background Art

[0002] At present, disperse dye printing generally adopts the following methods:

[0003] 1. Transfer printing: Disperse dyes are printed on transfer paper by digital inkjet printing or gravure roller printing, and then heat-transferred to fabric by transfer printing machine. The advantage of this method is that the sizing amount can be precisely controlled and it can be washed-free after high-temperature baking. The disadvantage is that the process is long and the cost is high.

[0004] 2. Gravure roller printing: The principle of gravure printing is to process a concave dot matrix on the surface of a steel roller according to the printing pattern by electro-engraving or etching, control the depth of the concave dot according to the amount of slurry applied, and then make the roller surface full of printing slurry, and then use a scraper to scrape off the slurry outside the concave dot, and then press the roller body against the fabric, and then the slurry in the concave dot of the roller body is transferred to the fabric. The advantage of this method is that the sizing amount can be accurately controlled, and it can be washed without water after high-temperature baking. The disadvantage is that the gravure roller is complicated to process and the roller manufacturing cost is high. It is suitable for mass production of chemical fiber fabrics.

[0005] 3. Rotary screen printing: The rotary screen is installed on the racks on both sides of the printing machine, and the color paste scraper / magnetic roller is installed on the scraper rack inside the rotary screen. The color paste enters the rotary screen through the pulp pipe via the pulp pump, and then the color paste scraper / magnetic roller prints the color paste on the fabric through the mesh on the rotary screen. The advantages of this method are low production cost of the rotary screen, fast response, and suitable for small batches and multiple varieties. The disadvantages are that the printing additives must be washed after baking, the process is long, and the amount of sizing is difficult to control. Generally, there is a waste of sizing material and water.

[0006] Among them, transfer printing and gravure roller printing can be used for disperse dye printing of chemical fiber fabrics due to their advantages of water-free printing. However, for printing companies, the cost of existing water-free printing equipment is relatively high, and adding another production line for disperse dye printing of small batches of chemical fiber fabrics will greatly increase the cost burden of the company. How to make the existing rotary screen printing equipment achieve the effect of gravure printing and realize water-free printing without adding another production line is a topic worthy of research in the field of printing equipment, and has broad market prospects. Summary of the invention

[0007] The object of the present invention is to provide a dual-purpose printing device.

[0008] The technical solution to achieve the purpose of the present invention is: a dual-purpose printing equipment, which includes a magnetic table, a replaceable printing plate and a scraping device, the printing plate can be installed above the magnetic table in a liftable manner, a printing guide is installed between the gap between the printing plate and the magnetic table, and the fabric to be printed is placed on the printing guide; the scraping device includes a magnetic roller and a pulp tube for supplying pulp to the printing plate, one end of the pulp tube is closed, and the other end of the pulp tube is connected to the pulp supply system, and the bottom of the pulp tube is provided with a plurality of pulp supply holes along its length direction, and the magnetic roller is installed in the printing plate and connected to the bottom of the printing plate. The inner wall of the bottom of the cylinder is in contact with the inner wall of the cylinder, and the magnetic roller is parallel to the roller axis of the printing plate; the printing plate is either a rotary screen or a hollow gravure roller. When the printing plate is a rotary screen, the pulp tube is inserted into the rotary screen, and the closed end of the pulp tube passes through the inner cavity of the rotary screen from one axial end of the rotary screen and then passes through the other axial end of the rotary screen and is fixed on a lifting mechanism that drives the rotary screen to lift and lower. The pulp feeding hole of the pulp tube is opposite to the inner wall of the bottom of the rotary screen, and a drainage plate is installed on the side wall of the pulp tube along the length direction of the pulp tube. The drainage extends downward from the side wall of the pulp tube to the side of the magnetic roller on the same side thereof, and the inclined section of the drainage plate is located on the path where the pulp falls from the pulp hole; When the printing plate is a hollow gravure roller, the gravure roller is a metal cylinder with no openings on the surface and a thickness of 0.5 to 1 mm. A scraper mechanism is installed on the outside of the gravure roller, and the scraper mechanism includes a knife shaft, a scraper seat and a scraper. The knife shaft is arranged parallel to the gravure roller, and both ends of the knife shaft are rotatably installed on a knife shaft lifting mechanism that drives the knife shaft to rise and fall. The scraper seat is fixedly installed on the knife shaft, and the scraper is fixedly installed on the scraper seat. The height of the knife shaft and the distance between the knife shaft and the gravure roller are such that the scraper can contact the outer wall of the gravure roller when rotating downward with the knife shaft. The gravure roller is provided with a supporting roller bracket fixedly installed inside along the axial direction of the gravure roller, and both ends of a supporting roller are fixedly installed on the supporting roller bracket through connecting plates, the supporting roller is tangent to the inner wall of the gravure roller where the outer walls of the scraper and the gravure roller abut each other, the two axial ends of the supporting roller bracket extend out of the gravure roller and are connected to the gravure roller through bearings, the two ends of the supporting roller are arranged in parallel on a lifting mechanism for driving the rotary screen to lift, the slurry pipe is installed on a frame above the junction of the blade of the scraper and the outer wall of the gravure roller, and a cavity for receiving the slurry is formed when the blade of the scraper contacts the outer wall of the gravure roller.

[0009] Furthermore, the knife shaft is mounted on a rotary screen lifting mechanism, and the rotary screen lifting mechanism includes first cylinders respectively mounted on frames at both ends of the printing plate, and a support frame for fixing the printing plate and the knife shaft is respectively mounted on the free end of the piston rod of each first cylinder. The structure in which the printing plate and the knife shaft are lifted together is relatively compact and has good synchronization.

[0010] The present invention, without changing the components below the guide belt of the rotary screen printing machine on the production line, sets a gravure roller that can replace the rotary screen and a scraper assembly matched with the gravure roller at the installation station of the rotary screen, so that the existing production line can flexibly switch the printing plate according to production needs. The gravure roller has the same external dimensions and installation method as the rotary screen. Compared with the traditional gravure roller, it has the advantages of easy engraving of the plate and low plate making cost. The gravure engraving assisted by the supporting roller can achieve the effect of imitating digital printing. The innovative dual-purpose printing equipment is particularly suitable for the production of small batches of multi-variety printed fabrics, and has a very broad application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the main structure of the printing machine described in Example 1 of the present invention;

[0012] Figure 2 for Figure 1 The partial cross-sectional and partial perspective structural diagram of the lifting mechanism is not included;

[0013] Figure 3 for Figure 1 A schematic diagram of the partial perspective structure of the pulp pipe, gravure roller and magnetic table from the left;

[0014] Figure 4 for Figure 1 A schematic diagram of the top view of the scraper mechanism described in the figure;

[0015] Figure 5 This is a schematic diagram of the main structure of the printing machine described in Example 2 of the present invention;

[0016] Figure 6 for Figure 5 The partial cross-sectional and partial perspective structural schematic diagram of the lifting mechanism is not included.

[0017] The rotating arrow represents the movement direction of the gravure roller, and the horizontal arrow represents the movement direction of the guide belt. DETAILED DESCRIPTION

[0018] The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0019] Example 1

[0020] like Figures 1 to 4As shown, a dual-purpose printing equipment includes a gravure roller 1, a magnetic table 2 and a scraper device 3. The gravure roller 1 is opposite to the magnetic table 2 and is installed above the magnetic table 2 through a round screen lifting mechanism. A printing guide 4 is installed in the gap between the gravure roller 1 and the magnetic table 2, and a fabric 20 to be printed is placed on the printing guide 4. The scraper device 3 includes a magnetic roller 31, a pulp pipe 32 for supplying pulp to the gravure roller 1, and a scraper mechanism 33. The magnetic roller 31 is installed in the gravure roller 1 and fits with the bottom inner wall of the gravure roller 1. The magnetic roller 31 is parallel to the roller axis of the gravure roller 1. One end of the pulp pipe 32 is closed, and the other end of the pulp pipe 32 is connected to the pulp supply system (not shown). A pulp supply hole 321 is opened at the bottom of the pulp pipe 32.

[0021] The gravure roller 1 described in this embodiment is a metal cylinder with no openings on the surface and a thickness of 0.5 to 1 mm. The scraper mechanism 33 is installed on the outside of the gravure roller 1. The scraper mechanism 33 includes a knife shaft 331, a scraper seat 332 and a scraper 333. The knife shaft 331 is arranged parallel to the gravure roller 1. A supporting roller bracket 34 is fixedly installed inside the gravure roller 1 along the axial direction of the gravure roller. Both ends of a supporting roller 35 are fixedly installed on the supporting roller bracket 34 through a connecting plate 36. The supporting roller 35 is tangent to the inner wall of the gravure roller 1 where the scraper 333 and the outer wall 11 of the gravure roller 1 are abutted. The two shaft ends of the supporting roller bracket 34 extend out of the gravure roller 1 and are connected to the gravure roller 1 through bearings 37. The round screen lifting The mechanism includes a first cylinder 5 installed on a frame 10 on both ends of the gravure roller 1, a support frame 6 is fixedly installed on the free end of the piston rod 51 of each of the first cylinders 5, the two ends of the supporting roller bracket 34 are mounted on the two support frames 6 in parallel, the two ends of the knife shaft 331 are rotatably mounted on the support frames 6 in parallel, the scraper seat 332 is fixedly mounted on the knife shaft 331, and the scraper 333 is fixedly mounted on the scraper seat 332. The height of the knife shaft 331 and the distance between the knife shaft 331 and the gravure roller 1 are limited to the scraper 333 can contact the outer wall of the gravure roller 1 when the scraper 333 rotates downward with the knife shaft 331, and a cavity for receiving the slurry is formed when the blade of the scraper 333 contacts the outer wall of the gravure roller 1.

[0022] During operation, the pulp pipe supplies pulp to the junction between the blade of the scraper and the outer wall of the gravure roller, and then the gravure roller is rotated. The scraper contacts the rotating gravure roller to scrape off the pulp outside the concave points, and then the lifting cylinder is started to drive the gravure roller fixed on the support frame through the supporting roller and the scraper seat on the knife shaft to descend until the gravure roller is pressed tightly against the fabric. At this time, the pulp in the concave points of the roller body is transferred to the fabric; since the wall thickness of the gravure roller is very thin, it is still necessary to rely on the magnetic rod inside the gravure roller to press the gravure roller downward, and the supporting roller contacts the rotating gravure roller to support the pressure of the scraper on the gravure roller.

[0023] Example 2

[0024] like Figure 5 and Figure 6As shown, a dual-purpose printing device includes a rotary screen 1', a magnetic table 2' and a scraper device 3'. The rotary screen 1' is installed on its workstation to replace the gravure roller of Example 1. The scraper device 3' includes a magnetic roller 31' and a pulp pipe 32'. The magnetic roller 31' It is installed in the cylinder screen 1' and fits with the bottom inner wall of the cylinder screen 1', the magnetic roller 31' is parallel to the roller axis of the cylinder screen 1', the end of the pulp pipe 32' is a closed end, and a plurality of pulp feeding holes 321' are opened at the bottom of the pulp pipe 32' along the length direction of the pulp pipe, and the end of the pulp pipe 32' passes through the inner cavity of the cylinder screen 1' from one axial end of the cylinder screen 1' and then passes through the other axial end of the cylinder screen 1' and is fixed on the liftable support frame 6', the pulp feeding hole 321' of the pulp pipe 32' is opposite to the bottom inner wall of the cylinder screen 1', and a drainage plate 322' is installed on the side wall of the pulp pipe 32' along the length direction of the pulp pipe, and the drainage plate 322' extends downward from the side wall of the pulp pipe to the side of the magnetic roller 31 on the same side thereof, and the inclined section of the drainage plate 322' is located on the path where the pulp falls from the pulp hole 321'.

[0025] During operation, the color paste flows from the paste feeding holes on the paste feeding pipe to the bottom of the round screen, and then the magnetic roller attracted to the magnetic table prints the color paste onto the fabric through the mesh holes.

[0026] The gravure roller 1 in Example 1 and the rotary screen 1' in Example 2 are both the printing plates described in the present invention.

[0027] The dual-purpose printing equipment realized by the present invention can flexibly replace the printing plate according to production needs without changing the magnetic table on the production line. The new gravure roller also improves the printing accuracy of the original rotary screen printing. Compared with adding a gravure printing equipment production line in the factory, the dual-purpose printing equipment greatly reduces the investment cost of the enterprise, and is particularly suitable for the production of small batches of multi-variety printed fabrics.

[0028] The innovative gravure screen wall thickness of the present invention is within 1 mm. By adding a supporting roller in the screen during plate making, the normal engraving operation of the engraving equipment can be guaranteed. The material of the gravure roller is the commonly used metal for gravure rollers on the market, which will not be elaborated here; the lifting device for driving the printing plate to rise and fall is not limited to the lifting cylinder, but can also be other conventional lifting devices in the mechanical field such as screw lifting; the gravure roller and the knife shaft can be lifted and lowered independently, but the lifting structure fixed together on the support frame is more compact and has good synchronization; the device structure for driving the knife shaft to rotate is a prior art, for example, it can be the angle adjustment mechanism for the scraper device of the gravure printing machine recorded in Patent No. 201520561584.X, which will not be elaborated here.

[0029] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent process changes made using the contents of the present invention specification, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A dual-purpose printing device, characterized in that: It includes a magnetic platform, a replaceable printing plate and a scraping device. The printing plate can be lifted and installed above the magnetic platform. A printing guide is installed between the printing plate and the magnetic platform, and the fabric to be printed is placed on the printing guide. The scraping device includes a magnetic roller and a pulp tube for supplying pulp to the printing plate. One end of the pulp tube is closed, and the other end of the pulp tube is connected to the pulp supply system. The bottom of the pulp tube is provided with a plurality of pulp supply holes along its length. The magnetic roller is installed in the printing plate and fits the bottom inner wall of the printing plate. The magnetic roller is parallel to the roller axis of the printing plate. The printing plate is either a round screen or a hollow gravure roller. When the printing plate is a round screen, the pulp tube is inserted into the round screen. In the net, the closed end of the pulp tube passes through the inner cavity of the round net from one axial end of the round net and out of the other axial end of the round net, and is fixed on the round net lifting mechanism that drives the round net to rise and fall. The pulp feeding hole of the pulp tube is opposite to the inner wall of the bottom of the round net. The side wall of the pulp tube is installed with a drainage plate along the length direction of the pulp tube. The drainage plate extends downward from the side wall of the pulp tube to the side of the magnetic roller on the same side. The inclined section of the drainage plate is located on the path where the pulp falls from the pulp feeding hole; when the printing plate is a hollow gravure roller, the gravure roller is a metal cylinder with no openings on the surface and a thickness of 0.5 to 1 mm. A scraper mechanism is installed on the outside of the gravure roller. The scraper mechanism includes a knife shaft, a scraper seat and a scraper. The knife shaft and the gravure roller are connected to the gravure roller. The rollers are arranged in parallel, the knife shaft is installed on the round screen lifting mechanism, the scraper seat is fixedly installed on the knife shaft, and the scraper is fixedly installed on the scraper seat. The height of the knife shaft and the distance between the knife shaft and the gravure roller are limited to the scraper can contact the outer wall of the gravure roller when the scraper rotates downward with the knife shaft. A supporting roller bracket is fixedly installed inside the gravure roller along the axial direction of the gravure roller, and both ends of a supporting roller are fixedly installed on the supporting roller bracket through a connecting plate. The supporting roller is tangent to the inner wall of the gravure roller where the outer walls of the scraper and the gravure roller are in contact. The two shaft ends of the supporting roller bracket extend out of the gravure roller and are connected to the gravure roller through bearings. The two ends of the supporting roller are set up in parallel on the round screen lifting mechanism, and the pulp pipe is installed on the scraper On the frame above the junction of the blade of the knife and the outer wall of the gravure roller, a cavity for receiving the slurry is formed when the blade of the scraper contacts the outer wall of the gravure roller; the round screen lifting mechanism includes first cylinders respectively installed on the frames on both ends of the printing plate, and a support frame is respectively installed on the free end of the piston rod of each first cylinder; when the printing plate is a hollow gravure roller, the two ends of the supporting roller bracket are parallel to the support frame, and the two ends of the knife shaft are rotatably parallel to the support frame; when the printing plate is a round screen, the closed end of the slurry pipe passes through the inner cavity of the round screen from one axial end of the round screen to the other axial end of the round screen and is fixed on the support frame.

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