Printing device and method

Abstract

The invention discloses a printing device and belongs to the technical field of intelligent printing, the printing device comprises a rotary screen printing mechanism located at the front end and a digital printing mechanism arranged at the rear end of the rotary screen printing mechanism, the rotary screen printing mechanism is used for presenting dark background patterns on cloth, and the digital printing mechanism is used for presenting multi-color patterns on the cloth. The digital printing mechanism comprises a printing main machine and a spray head part; a rotary conveying mechanism is arranged between the rotary screen printing mechanism and the digital printing mechanism, cloth direct injection conveying mechanisms are arranged at the front end and the rear end of the digital printing mechanism, and a printing alignment mechanism is arranged at the front end of the digital printing mechanism.

Description

Technical Field

[0001] The present invention relates to the field of intelligent printing technology, and in particular to a printing device and method. Background Art

[0002] The current mainstream forms of printing and dyeing include: rotary screen printing, gravure printing and digital direct printing. The digital direct printing process refers to the process of digitally processing various graphics and inputting them into the computer, processing them through the computer color separation printing system, and then directly printing the special dyes on the starched semi-finished textiles or other media through the printing system by special software, and then processing them to obtain the required printed products. Compared with traditional printing, the digital direct printing process prints clear patterns and rich color levels, which can meet the needs of personalized production; it saves the steps of tracing, film making, screen making and engraving, greatly shortens the process flow, improves the printing production efficiency, and saves production costs, which is in line with the environmental protection and energy-saving concept advocated by the country.

[0003] Existing digital printing usually uses electrostatic nozzles to spray different pigments. When processing large background dark patterns, the nozzles are required to perform a large amount of inkjet operations. In this case, the workload of the nozzle group of a specific color is extremely large, and a large amount of ink is prone to seepage on the fabric, which can easily cause the color of the finished fabric to be not fine enough. Summary of the invention

[0004] The object of the present invention is to provide a printing device and method, by arranging rotary screen printing at the front end and arranging digital printing at the rear end, the dark background color is processed by rotary screen printing, and the complex and gorgeous multi-color is processed by digital printing, thereby improving the vividness and accuracy of the color of the finished fabric.

[0005] In order to achieve the above object, the technical solution of the present invention is as follows: A printing device, comprising a rotary screen printing mechanism at the front end and a digital printing mechanism arranged at the rear end of the rotary screen printing mechanism, wherein the rotary screen printing mechanism is used to present a dark background pattern on a cloth, and the digital printing mechanism is used to present a multi-color pattern on a cloth, and the digital printing mechanism comprises a printing host and a nozzle component; A rotary conveying mechanism is arranged between the rotary screen printing mechanism and the digital printing mechanism, a cloth direct injection conveying mechanism is arranged at the front end and the rear end of the digital printing mechanism, and a printing alignment mechanism is arranged at the front end of the digital printing mechanism; The printing alignment mechanism includes a camera, which is used to shoot a designated basic pattern on the fabric after rotary screen printing. The printing host receives the pattern captured by the camera, and after processing, compares it with the pattern to be processed by the digital printing mechanism. When the two patterns are not aligned, the processor controls the fabric direct injection conveying mechanism to perform corresponding fine-tuning operations on the fabric at the digital printing mechanism.

[0006] Furthermore, a smooth platen is arranged below the nozzle component, the cloth to be printed is arranged between the nozzle component and the platen, and the cloth direct injection conveying mechanism is arranged at the front and rear ends of the platen, and the cloth to be printed is conveyed in a flat state between the two.

[0007] Furthermore, the camera is arranged at the front end of the nozzle component, and the distance between the center point of the camera and the nozzle component is consistent with the distance between single pattern cycles of the rotary screen printing.

[0008] Furthermore, the rotary conveying mechanism includes an adjustable roller shaft that can move up and down freely, and both ends of the adjustable roller shaft are connected to the straight rod through bearings and sliders.

[0009] A printing method, comprising: Performing color separation processing on the original printing pattern with a circular structure, selecting a background pattern, generating a monochrome first pattern, making a rotary screen according to the first pattern, and mixing a corresponding pigment according to the color of the first pattern, and placing the pigment inside the rotary screen of the rotary screen printing mechanism; After removing the first pattern portion from the original pattern, a second pattern is generated, and the printing host performs YMCK color separation processing on the second pattern to produce a YMCK pattern group, and the YMCK pattern group is respectively configured to the nozzle for corresponding direct printing operation; Selecting a region with features in the first pattern to generate a basic pattern, wherein the basic pattern with distinguishing features only appears once on a straight line in a single pattern cycle, and includes at least two basic feature points located on the straight line, and measuring the actual distance between the two basic feature points; The center point of the camera is arranged at the front end of the nozzle component, and the distance between the two is consistent with the distance between a single cloth cycle of the rotary screen printing. The center point of the camera is arranged just above the midpoint of the basic feature point; When the basic pattern part of the fabric is conveyed to the center point of the camera, the camera shoots the basic pattern area of ​​the fabric to generate a shooting pattern. The printing host obtains the shooting pattern and compares it with the basic pattern in a center-aligned manner, and calculates the deviation value between the shooting pattern and the basic pattern based on the actual distance value. The printing host fine-tunes the fabric conveying through the fabric direct-injection conveying mechanism according to the deviation value, thus realizing the alignment printing operation of the front rotary screen printing and the rear digital printing.

[0010] Furthermore, during the comparison operation, the basic pattern and the photographed pattern may be subjected to edge finding processing, and a corresponding pattern including only the edge lines of the image may be obtained.

[0011] Furthermore, in the operation of generating the first pattern and the second pattern, the contours that overlap each other to a certain extent are retained, and the color within the contour is subjected to a reduction process in the first pattern, wherein the reduction process is performed in a gradual manner from the inside to the edge.

[0012] Furthermore, when the deviation value is less than or equal to the preset minimum deviation value, the original digital printing operation can continue to be maintained. When the deviation value is greater than the preset minimum deviation value, the processor controls the fabric direct injection conveying mechanism and, in the interval between the reciprocating operations of the nozzle, fine-tunes the fabric forward or backward and aligns the photographed pattern with the basic pattern.

[0013] Furthermore, when the deviation value is greater than the preset maximum deviation value, the printing host controls the fabric direct-jet conveying mechanism, and adjusts the fabric forward or backward during the intervals between the reciprocating operations of the nozzle, and adjusts the fabric according to the deviation value.

[0014] Furthermore, when the deviation value is less than or equal to the set maximum deviation value, the printing host divides the deviation value by the number of times the nozzle reciprocates in a single pattern cycle to obtain a single adjustment value. The printing host controls the fabric direct injection conveying mechanism to fine-tune the fabric forward or backward with the single adjustment value in each gap between the reciprocating operations of the nozzle.

[0015] Compared with the existing technology, this solution has the following advantages: The scheme is a printing device, which first performs color printing on a dark background pattern (this color may also appear in a fine pattern) through a rotary screen, so that the fabric can obtain a dark or high-level background pattern, thereby improving the color saturation and vividness of the fabric; then the remaining colors are combined through a digital direct printing method, so that the two patterns are integrated, and the digital direct printing method presents exquisite and rich colors, and finally the finished fabric shows a color pattern with strong contrast and bright colors. This type of fabric can be widely used in curtains, wall coverings, home fabrics and high-end ready-made clothes, etc., and has excellent visual beauty; This solution uses a rotary screen to print dark background patterns, which can greatly ease the working intensity of the direct-injection nozzle and reduce the blurring or ink seepage on the fabric caused by a large amount of ink jetting. Therefore, the fineness of the finished fabric can be improved, and the working efficiency of the nozzle can be greatly improved. The service life of the nozzle can be increased, and its replacement and maintenance costs can be reduced; The present scheme is a printing method that can solve the problem of uniform linear fabric conveying of traditional rotary screen printing and step-by-step direct-injection printing, which is prone to front-to-back deviation during fabric conveying, thereby causing deviation in the color printing of the two, greatly affecting the consistency of the fabric pattern. The present scheme photographs the fabric in the same fabric cycle, compares it with the standard basic pattern, and then calculates the specific value of the deviation. The corresponding fine-tuning operation can be performed according to the deviation value, thereby greatly improving the consistency of fabric printing and reducing the occurrence of fabric loss. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of a preferred embodiment.

[0017] Figure 2 It is a schematic diagram of the structure of the rotary screen printing mechanism.

[0018] Figure 3 It is a schematic diagram of the rotary conveying mechanism structure.

[0019] Figure 4 This is a schematic diagram of the digital printing mechanism structure.

[0020] Figure 5 Schematic diagram of the original printing pattern.

[0021] Figure 6 This is a schematic diagram of the first pattern.

[0022] Figure 7 This is a schematic diagram of the second pattern.

[0023] Figure 8 A schematic diagram of the basic pattern.

[0024] Fig. 9 This is a schematic diagram of the superposition and comparison of the photographed pattern and the basic pattern. DETAILED DESCRIPTION

[0025] refer to Figures 1 to 4 A printing device comprises a rotary screen printing mechanism 1 at the front end and a digital printing mechanism 2 arranged at the rear end of the rotary screen printing mechanism, wherein the rotary screen printing mechanism 1 is used to present a dark background pattern on a cloth, and the digital printing mechanism 2 is used to present a multi-color pattern on the cloth; The rotary screen printing mechanism 1 includes at least one hollow thin-walled rotary screen roller 10, under which a guide belt 11 and a support roller 12 are arranged. The cloth to be printed is transported at a uniform speed between the rotary screen roller 10 and the guide belt. A downward scraper is arranged inside the rotary screen roller 10. The printing pigment inside the rotary screen roller 10 passes through the thin-walled printing holes of the rotary screen roller 10 under the extrusion of the scraper and is printed on the surface of the cloth, forming a continuous cycle of printing operation. The support roller 12 is used for balanced support to make the printed surface of the cloth smoother.

[0026] A first oven 3 and a rotary conveying mechanism 4 are arranged between the rotary screen printing mechanism 1 and the digital printing mechanism 2. The first oven 3 is used to perform basic drying operations on the fabric printed by the rotary screen printing mechanism 1 so that the printing pigment is firmly attached to the fabric.

[0027] In order to ensure the accuracy and smoothness of the printing operation, since the rotary screen printing mechanism 2 uses a uniform and linear working mode to print and transport the fabric, too fast, too slow or intermittent transport will often produce uneven colors on the fabric; and the digital printing mechanism 2 usually transports in a step-by-step manner. Generally speaking, the nozzle moves horizontally once or moves back and forth once, and the fabric is transported forward by the length of the nozzle width range, thereby realizing continuous and coherent direct printing operation; in order to balance the uniform speed transport and step-by-step transport, and coordinate the transport of the two, each other There is no interference with each other. A rotary conveying mechanism 4 is arranged at the rear end of the first oven 3, which includes an adjusting roller 41 that can move up and down freely. The two ends of the adjusting roller 41 are connected to the straight rod 43 through bearings and sliders 42. Therefore, the slider 42 can move freely up and down on the straight rod 43 in a very low damping manner. The adjusting roller 41 is arranged inside the V-shaped transmission cloth, so under the action of its gravity, the cloth is always in a V-shaped rotary conveying state. The V-shaped rotary conveying structure is used to accommodate the cloth and coordinate the uniform speed conveying and step-by-step conveying of the cloth.

[0028] The digital printing mechanism 2 includes a printing host and a nozzle component 21, the nozzle component 21 is connected to an ink pipeline, and the nozzle component is connected to a transverse reciprocating drive component. Under the control of the printing host, the printing operation of the pattern is implemented by analyzing the image to be printed, controlling the nozzle component and the transverse reciprocating drive component; a smooth table 22 is arranged under the nozzle component, and the fabric to be printed is arranged between the nozzle component 21 and the table 22.

[0029] In the digital printing mechanism 2, especially the front and rear ends of the nozzle component 21, there are arranged direct-injection fabric conveying mechanisms 23. The direct-injection fabric conveying mechanisms 23 convey the fabric in a clamping roller manner, and include a pair of rollers in a clamping state up and down. The fabric is conveyed between the two rollers, and it is ensured that the fabric is conveyed in a straight manner and with reasonable tension between the two rollers. The rollers of the direct-injection fabric conveying mechanism 23 are connected to high-precision servo motors and precise angle sensors, which can accurately control the rotation, rotation angle and rotation speed of the rollers, and enable the direct-injection fabric conveying mechanisms 23 at the front and rear ends to perform synchronous rotation operations.

[0030] Under the control of the printing host, the fabric direct-injection conveying mechanism 23 conveys the fabric forward in steps. The stepping amplitude is generally consistent with the printing width of the nozzle component 21. Normally, when the nozzle component 21 moves from one side to the other side (completing an inkjet printing operation), the fabric direct-injection conveying mechanism 23 conveys the fabric forward by one printing unit, and the digital printing operation is performed reciprocally in this way.

[0031] A printing alignment mechanism 5 is arranged at the front end of the digital printing mechanism 2. The printing alignment mechanism 5 includes a camera, which is connected to the printing host. Specifically, the camera is arranged at the front end of the nozzle component, and the distance between the center point of the camera and the nozzle component is consistent with the distance between the single pattern cycles of the rotary screen printing (a single pattern cycle of the rotary screen printing can be understood as a rotation of the rotary screen, which can make the front and back patterns just connected to achieve a continuous and uninterrupted pattern). Therefore, the pattern corresponding to the center point of the camera is the pattern of the current nozzle component 21 implementing the inkjet operation, thereby realizing the synchronization of the camera photo sampling and the current inkjet printing.

[0032] The fabric is subjected to inkjet printing at the digital printing mechanism 2, and is matched with the background color printing of the rotary screen printing mechanism 1 to realize complete pattern printing, so that the fabric presents a complete and clear design pattern. After the fabric completes subsequent processes, such as drying and shaping, the entire printing operation is completed.

[0033] The scheme is a printing method combining rotary screen printing and digital printing, which is used to decompose the original printing image to make it suitable for the printing combined with rotary screen printing and digital printing, including: For the original printed pattern with a circular structure (reference Figure 5 ) to perform color separation, select a background pattern, and generate a monochrome first pattern (reference Figure 6 ), making a rotary screen according to the first pattern, and mixing a corresponding pigment according to the color of the first pattern, and placing the pigment inside the rotary screen of the rotary screen printing mechanism; After removing the first pattern part from the original pattern, the second pattern is generated (reference Figure 7 ), the second pattern is subjected to YMCK color separation processing to produce a YMCK pattern group, and the YMCK pattern groups are respectively configured to the nozzles for corresponding direct injection operations.

[0034] In order to better integrate the first pattern with the digital printing pattern and reduce the blank gaps at the junction of the two, when generating the first pattern, a certain coverage area that can overlap the edge of the second pattern is reserved for its outer contour, and the color of the coverage area in the first pattern is subtracted. Specifically, the coverage area can be based on the edge, sample 1-2 pixel intervals inward, and expand 2-3 pixel intervals outward. When subtracting the coverage area, according to the YMCK printing principle, the coverage area is processed from the inside to the outside, and the printing points are implemented in a gradual manner from a large-diameter dense structure to a small-diameter sparse structure.

[0035] Due to the difference in fabric conveying (uniform speed conveying and step-by-step conveying), it is easy for the fabric to be difficult to align after passing through rotary screen printing and reaching the digital printing. At the same time, due to the long-term printing operation, the slight conveying deviation at the beginning will cause the error to be continuously magnified, resulting in a printing deviation between the two and defects in the finished fabric.

[0036] This solution uses a camera to capture the designated basic pattern on the fabric after rotary screen printing. The printing host receives the pattern captured by the camera, and after processing, compares it with the pattern to be processed by the digital printing mechanism. When the two patterns are not aligned, the processor controls the fabric direct injection conveying mechanism to perform corresponding fine-tuning operations on the fabric at the digital printing mechanism 2.

[0037] Specifically, a method for aligning a rotary screen printing and a digital printing combined printing comprises: Select the region with features in the first pattern to generate the base pattern (refer to Figure 8 ), the basic pattern with distinguishing features appears only once on a straight line in a single pattern cycle, and includes at least two basic feature points A and B located on the straight line, and the actual distance value H of the two basic feature points is measured; The center point of the camera is arranged at the front end of the nozzle component, and the distance between the two is consistent with the distance between a single cloth cycle of the rotary screen printing. The center point of the camera is arranged just above the midpoint of the basic feature points A and B. The camera field of view can completely cover the two points A and B, and ensure that distortion or distortion is reduced during shooting. If necessary, soft light is arranged around the camera to improve the lighting conditions; When the basic pattern part of the fabric is conveyed to the center point of the camera, the camera captures the basic pattern area of ​​the fabric. The capturing operation should be in the state of stopping the intermittent conveying of the fabric, and a captured pattern is generated. The processor of the printing host obtains the captured pattern and compares it with the basic pattern in a center-aligned manner (refer to Fig. 9), during the comparison operation, the basic pattern and the photographed pattern can be processed for edge finding, and the corresponding pattern including only the edge lines of the image can be obtained. Through such operation, the feature points can be made clearer and more recognizable, and the accuracy of the deviation value distance measurement technology can be improved. Fig. 9 The blue dot in the middle is the position of point A in the photographed pattern, so the position relationship of the blue dot in the H straight line and the actual distance value H are used as the basis to calculate the deviation value H1 between the photographed pattern and the basic pattern.

[0038] When the deviation value H1 is less than or equal to the preset minimum deviation value, which is usually 0.2 mm, the deviation has little effect on the pattern, and the original digital printing operation can be maintained; When the deviation value H1 is greater than the preset maximum deviation value, usually, the maximum deviation value can be 4.0 mm, that is, the pattern of the digital printing nozzle in the rotary screen printing is in a serious misalignment state, and the pattern cannot be corrected by gradual fine-tuning. Then, the printing host controls the cloth direct-jet conveying mechanism 23, and adjusts the cloth forward or backward during the interval of the nozzle reciprocating work, and adjusts it with the deviation value H1 to ensure that the next direct-jet printing is aligned with the rotary screen printing. It should be noted that due to the direct and large-scale adjustment, part of the pattern will be in a serious misalignment state, and the section of cloth will be in a defective state. Of course, this state rarely occurs, usually at the beginning of digital printing. When the deviation value H1 is less than or equal to the set maximum deviation value, that is, the digital printing nozzle is in a slightly misaligned state in the pattern of rotary screen printing. The printing host divides the deviation value H1 by the number of times the nozzle reciprocates N in a single pattern cycle to obtain a single adjustment value. The printing host controls the fabric direct injection conveying mechanism to perform forward or backward fine-tuning processing on the fabric with a single adjustment value at each gap between the nozzle reciprocating operations, and at the end of the single fabric cycle, the photographed pattern is aligned with the basic pattern.

[0039] At this point, through the alignment method of combined rotary screen printing and digital printing in this scheme, whether it is the initial stage or midway of digital printing, the basic pattern can be photographed and compared by the camera to ensure the precise alignment of the two, thereby achieving fine pattern restoration. By aligning the operation in each printing cycle, the operation is more controllable and convenient.

[0040] In summary, the printing device of the present scheme can firstly color and print the dark background pattern (the color may also appear in the fine pattern) through the rotary screen, so that the fabric can obtain the pattern of the dark or high-level background, and improve the color saturation and vividness of the fabric; then the remaining colors are combined through the digital direct printing method, so that the patterns of the two are integrated, and the digital direct printing method presents exquisite and rich colors, and finally the finished fabric shows the color pattern with strong contrast and bright colors. Such fabrics can be widely used in curtains, wall cloths, home fabrics and high-end ready-made clothes, etc., and have excellent visual beauty; This solution uses a rotary screen to print dark background patterns, which can greatly ease the working intensity of the direct-injection nozzle and reduce the blurring or ink seepage on the fabric caused by a large amount of ink jetting. Therefore, the fineness of the finished fabric can be improved, and the working efficiency of the nozzle can be greatly improved. The service life of the nozzle can be increased, and its replacement and maintenance costs can be reduced; The present invention provides an alignment method for combined rotary screen printing and digital printing, which can solve the problem of uniform linear fabric conveying of traditional rotary screen printing and step-by-step direct-injection printing, which is prone to front-back deviation during fabric conveying, and then deviation in the color printing of the two, greatly affecting the consistency of fabric patterns. The present invention photographs the fabric in the same fabric cycle, compares the standard basic pattern, and then the specific value of the technical deviation. The corresponding fine-tuning operation can be performed according to the deviation value, which greatly improves the consistency of fabric printing and reduces the occurrence of fabric loss.

Claims

1. A printing device, characterized in that: It includes a rotary screen printing mechanism at the front end and a digital printing mechanism arranged at the rear end of the rotary screen printing mechanism, wherein the rotary screen printing mechanism is used to present a dark background pattern on the fabric, and the digital printing mechanism is used to present a multi-color pattern on the fabric, and the digital printing mechanism includes a printing host and a nozzle component; A rotary conveying mechanism is arranged between the rotary screen printing mechanism and the digital printing mechanism, a cloth direct injection conveying mechanism is arranged at the front end and the rear end of the digital printing mechanism, and a printing alignment mechanism is arranged at the front end of the digital printing mechanism; The printing alignment mechanism includes a camera, which is used to shoot a designated basic pattern on the fabric after rotary screen printing. The printing host receives the pattern captured by the camera, and after processing, compares it with the pattern to be processed by the digital printing mechanism. When the two patterns are not aligned, the processor controls the fabric direct injection conveying mechanism to perform corresponding fine-tuning operations on the fabric at the digital printing mechanism.

2. A printing device according to claim 1, characterized in that: A smooth platen is arranged below the nozzle component, the cloth to be printed is arranged between the nozzle component and the platen, and the cloth direct injection conveying mechanism is arranged at the front and rear ends of the platen, and the cloth to be printed is conveyed in a flat state between the two.

3. A printing device according to claim 1, characterized in that: The camera is arranged at the front end of the nozzle component, and the distance between the center point of the camera and the nozzle component is consistent with the distance between single pattern cycles of the rotary screen printing.

4. A printing device according to claim 1, characterized in that: The rotary conveying mechanism comprises an adjustable roller shaft which can move up and down freely, and the two ends of the adjustable roller shaft are connected with the straight rod through bearings and sliding blocks.

5. A printing method, characterized in that: include: Performing color separation processing on the original printing pattern with a circular structure, selecting a background pattern, generating a monochrome first pattern, making a rotary screen according to the first pattern, and mixing a corresponding pigment according to the color of the first pattern, and placing the pigment inside the rotary screen of the rotary screen printing mechanism; After removing the first pattern portion from the original pattern, a second pattern is generated, and the printing host performs YMCK color separation processing on the second pattern to produce a YMCK pattern group, and the YMCK pattern group is respectively configured to the nozzle for corresponding direct printing operation; Selecting a region with features in the first pattern to generate a basic pattern, wherein the basic pattern with distinguishing features only appears once on a straight line in a single pattern cycle, and includes at least two basic feature points located on the straight line, and measuring the actual distance between the two basic feature points; The center point of the camera is arranged at the front end of the nozzle component, and the distance between the two is consistent with the distance between a single cloth cycle of the rotary screen printing. The center point of the camera is arranged just above the midpoint of the basic feature point; When the basic pattern part of the fabric is conveyed to the center point of the camera, the camera shoots the basic pattern area of ​​the fabric to generate a shooting pattern. The printing host obtains the shooting pattern and compares it with the basic pattern in a center-aligned manner, and calculates the deviation value between the shooting pattern and the basic pattern based on the actual distance value. The printing host fine-tunes the fabric conveying through the fabric direct-injection conveying mechanism according to the deviation value, thus realizing the alignment printing operation of the front rotary screen printing and the rear digital printing.

6. A printing method according to claim 5, characterized in that: During the comparison operation, the basic pattern and the photographed pattern are subjected to edge finding processing, and a corresponding pattern including only the edge lines of the image is obtained.

7. A printing method according to claim 5, characterized in that: In the operation of generating the first pattern and the second pattern, the contours that overlap each other to a certain extent are retained, and the color within the contour is reduced in the first pattern, and the reduction is implemented in a gradual manner of increasing the reduction from the inside to the edge.

8. A printing method according to claim 5, characterized in that: When the deviation value is less than or equal to the preset minimum deviation value, the original digital printing operation can continue. When the deviation value is greater than the preset minimum deviation value, the processor controls the fabric direct injection conveying mechanism and, during the interval between the reciprocating operations of the nozzle, fine-tunes the fabric forward or backward and aligns the photographed pattern with the basic pattern.

9. A printing method according to claim 5, characterized in that: When the deviation value is greater than the preset maximum deviation value, the printing host controls the fabric direct injection conveying mechanism, and adjusts the fabric forward or backward during the intervals between the reciprocating operations of the nozzle, and adjusts the fabric according to the deviation value.

10. A printing method according to claim 5, characterized in that: When the deviation value is less than or equal to the set maximum deviation value, the printing host divides the deviation value by the number of times the nozzle reciprocates in a single pattern cycle to obtain a single adjustment value. The printing host controls the fabric direct injection conveying mechanism to fine-tune the fabric forward or backward with the single adjustment value at each gap between the nozzle reciprocating operations.

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