A digital preparation method for high three-dimensional embroidery

Abstract

The present invention relates to a digital preparation method for high three-dimensional embroidery, comprising the following steps: designing a pattern reference line; designing a stitch unit, the stitch unit including a plurality of stitches forming a broken line; adjusting the upper thread tension and the bobbin thread tension of an embroidery machine so that the twisting point of the upper thread and the bobbin thread is formed on the reverse side of the embroidery cloth; embroidering a plurality of the stitch units on the embroidery cloth to obtain an embroidery, and the stitch units are arranged in sequence on the pattern reference line. The present invention can simplify the three-dimensional embroidery process, bring more exquisite three-dimensional effects to the embroidery field, and has the characteristics of low cost, high efficiency and easy promotion.

Description

Technical Field

[0001] The present invention relates to the technical field of digital embroidery, and particularly to a digital preparation method for high three-dimensional embroidery products. Background Art

[0002] In recent years, digital flat embroidery technology has been popularized in the embroidery field, bringing people a rich variety of embroidery works. Although people have begun to try some three-dimensional digital embroidery methods, they are often too complex and difficult to achieve delicate effects, limiting their application and promotion.

[0003] For hand-embroidered Miao embroidery crinkle stitch, first, 8 strands of embroidery thread are braided into a braid belt, and then the braid belt is fixed on the embroidery cloth in a spiral wave shape. Through the stacking and extrusion effect of the embroidery thread, crinkle stitch forms its unique high three-dimensionality. Inspired by the crinkle stitch technique of hand-embroidered Miao embroidery, using a digital embroidery machine to directly stack embroidery threads to simulate the delicate braiding mechanism and three-dimensionality of crinkle stitch is a new direction for exploring digital three-dimensional embroidery methods. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a digital preparation method for high three-dimensional embroidery products, which can simplify the process, and achieve high three-dimensional digital embroidery at low cost and high efficiency.

[0005] The technical solution adopted by the present invention to solve its technical problems is: to provide a digital preparation method for high three-dimensional embroidery products, including:

[0006] Designing a pattern reference line;

[0007] Designing a stitch unit, the stitch unit including a plurality of stitches forming a broken line;

[0008] Adjusting the upper thread tension and the bobbin thread tension of the embroidery machine so that the twisting point of the upper thread and the bobbin thread is formed on the reverse side of the embroidery cloth;

[0009] Embroidery a plurality of the stitch units on the embroidery cloth, the stitch units being arranged in sequence on the pattern reference line, and forming a high three-dimensional embroidery product on the reverse side of the embroidery cloth.

[0010] Further, when designing the stitch unit, by setting a stitch gap, the embroidery thread within the stitch unit is squeezed, and the stitch gap is the vertical distance from any needle drop point within the stitch unit to the adjacent stitch.

[0011] Further, the stitch gap is smaller than the fineness of the embroidery thread.

[0012] Further, between the step of designing the stitch unit and the step of embroidering a plurality of the stitch units on the embroidery cloth, there is also a step of adjusting the length and the outer contour width of the stitch unit so that the embroidery thread within the stitch unit is squeezed.

[0013] Further, the included angle formed by the stitch lines as a broken line is less than 90°.

[0014] Further, the bobbin thread tension is not less than twice the face thread tension.

[0015] Further, both the starting point and the ending point of the stitch unit fall on the pattern reference line, and the starting point of each stitch unit is the ending point of the previous stitch unit.

[0016] Further, the stitch unit includes at least a pair of needle landing points with a stitch gap not greater than the fineness of the embroidery thread, and the stitch gap is the vertical distance between two adjacent needle landing points on the contour line of the stitch unit.

[0017] Further, before the step of embroidering a plurality of stitch units on the embroidery cloth, a step of selecting the number of stitch layers is further included.

[0018] Further, the stitch unit is in a net-like form with a rectangular outer contour.

[0019] Further, the starting needle landing point and the ending needle landing point of the stitch unit are respectively located at the centers of two opposite contour lines of the stitch unit.

[0020] Further, the starting needle landing point and the ending needle landing point of the stitch line are evenly distributed on two opposite contour lines of the stitch unit.

[0021] Further, the stitch unit includes four "×"-shaped sub-stitch units arranged in a clockwise manner, and the starting point of each sub-stitch unit is the ending point of the previous sub-stitch unit.

[0022] Further, the stitch in the sub-stitch unit overlaps with at least one other stitch in the same sub-stitch unit.

[0023] Beneficial Effects

[0024] Due to the adoption of the above technical solutions, compared with the prior art, the present invention has the following advantages and positive effects:

[0025] (1) By adjusting the bobbin thread tension and the face thread tension, the loose face thread is pulled to the back side of the embroidery cloth by the taut bobbin thread, and the knot formed by the intertwining of the face thread and the bobbin thread is formed on the back side of the embroidery cloth. Thus, there is only one face thread under the trace of the stitch on the front side of the embroidery cloth, while under the trace of the stitch on the back side of the embroidery cloth is the bobbin thread and two face threads intertwined with the bobbin thread, causing the embroidery threads to be squeezed and stacked on the back side of the embroidery cloth, forming a three-dimensional effect;

[0026] (2) Every time the embroidery machine drops the needle, the needle and presser foot will exert pressure on the embroidery cloth and embroidery thread toward the back of the embroidery cloth. Each time the needle drops the needle, the embroidery cloth will be slightly bulged toward the back. The push of the needle and presser foot on the embroidery thread offsets part of the force of the bottom line being pulled to the front of the embroidery cloth. Therefore, it is easier to obtain a high three-dimensional effect by using the back of the embroidery cloth as the front of the embroidery product.

[0027] (3) The present invention designs the stitch unit to include a fold line shape. With the fold line direction, the upper thread will be pulled more to the back of the embroidery cloth. When the tension of the lower thread is constant, the smaller the fold line angle is, the greater the pulling force on the upper thread is, and the more it is pulled to the back of the embroidery cloth. When the tension difference between the upper thread and the lower thread is extremely large and the fold line angle is close to 0°, the amount of lower thread used is extremely reduced, and the stitch track on the back of the embroidery cloth is almost filled by two upper threads;

[0028] (4) The present invention reduces the stitch gap so that the stitch gap is close to or smaller than the fineness of the embroidery thread, thereby causing the embroidery thread to be squeezed in the horizontal space and bulge in the vertical space, and then stacking the stitch layers to cause accumulation in the vertical space, thereby achieving a high three-dimensional effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 is a flow chart of a first embodiment of the present invention;

[0030] Figure 2 is a schematic diagram of a sample reference line according to a first embodiment of the present invention;

[0031] Figure 3 is a schematic diagram of a mesh trace unit according to a first embodiment of the present invention;

[0032] Figure 4 This is a sample physical diagram of the first embodiment of the present invention;

[0033] Figure 5 is a comparison diagram of relevant parameters of sample embroidery in the first embodiment of the present invention;

[0034] Figure 6 This is a real picture of the Miao embroidery hand-embroidery product in the second embodiment of the present invention;

[0035] Figure 7 is a schematic diagram of a pattern reference line according to a second embodiment of the present invention;

[0036] Figure 8 2 is a schematic diagram of a stitch unit for simulating braid embroidery in a second embodiment of the present invention;

[0037] Figure 9 This is a real picture of a digitally embroidered textile in the second embodiment of the present invention. DETAILED DESCRIPTION

[0038] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and not to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of this application.

[0039] The first embodiment of the present invention relates to a digital preparation method for high three-dimensional embroidery, as Figure 1 shown, which includes the following steps:

[0040] (1) Design a pattern reference line, which can be obtained by plate-making with computer embroidery software, manually, or other conventional methods in the industry to obtain the pattern reference line;

[0041] (2) Design a stitch unit containing a broken line shape, and the stitch unit includes multiple stitches that form the broken line;

[0042] (3) Adjust the stitch gap so that it is close to or less than the fineness of the embroidery thread;

[0043] (4) Select the number of stitch layers;

[0044] (5) Adjust the upper thread tension and the bobbin thread tension of the embroidery machine so that the twisting point of the upper thread and the bobbin thread is formed on the back side of the embroidery cloth;

[0045] (6) Perform embroidery operations;

[0046] (7) Use the three-dimensional effect on the back side of the embroidery cloth as the front side of the embroidered product.

[0047] Among them, a stitch is the embroidery thread between two needle dropping points where the needle drops in sequence. The stitch unit is composed of multiple stitches, and there is an overlap between the stitches. The included angle of the broken line is preferably less than 90°; the number of stitches included in the stitch unit is not limited.

[0048] As Figure 2 shown, the pattern reference line is the basis for the arrangement of the stitch units. The starting point and the ending point of the stitch unit both fall on the pattern reference line. The starting point of the needle drop of the first stitch unit coincides with the starting point of the pattern reference line, and the starting point of the needle drop of each subsequent stitch unit is the ending point of the needle drop of the previous stitch unit. Accordingly, the stitch units are arranged in sequence on the pattern reference line.

[0049] Set the vertical distance from any needle dropping point in the stitch unit to its adjacent stitch as the stitch gap. By adjusting the stitch gap, the embroidery thread can be squeezed. Taking an embroidery thread of 40 metric counts as an example, its actual width is about 0.5 mm. Adjusting the straight-line distance between at least one pair of adjacent needle dropping points in the stitch unit to be close to or less than 0.5 mm can cause the embroidery thread to be squeezed because its fineness is greater than the stitch gap. As Figure 3 shown, adjusting the straight-line distance between needle dropping point 1 and point 11 to be close to or less than the fineness of the embroidery thread can cause the embroidery thread to be squeezed.

[0050] The stitch gap can also be measured by the length of the stitch unit or the width of the outer contour. As Figure 3 shown, the outermost needle entry points of the stitch unit form the outer contour of the stitch unit. The length of the stitch unit is set as the straight-line distance between the starting needle entry point and the ending needle entry point of the stitch unit. The straight line where the starting needle entry point and the ending needle entry point of the stitch unit are located is used as the projection direction, and the perpendicular line of this straight line is used as the projection baseline. The width of the outer contour of the stitch unit is set as the length of the projection of the outer contour of the stitch unit on the projection baseline. For the same stitch unit, the smaller the length and the width of the outer contour of the stitch unit, the smaller the stitch gap, which causes the embroidery thread to be squeezed.

[0051] The case where the upper thread tension is small and the bobbin thread tension is large means that compared with the embroidery tension for keeping the front and back sides of the embroidery cloth flat, the upper thread tension is smaller than the normal situation, and the bobbin thread tension is larger than the normal situation. More preferably, the bobbin thread tension can be set to be not less than 2 times the upper thread tension.

[0052] The causes of the three-dimensional effect of the present invention are as follows:

[0053] 1. There are two upper threads under the same stitch trajectory on the back side of the embroidery cloth: In ordinary embroidery operations, the upper thread tension and the bobbin thread tension are adjusted to a balanced state, so that the knot formed by the intertwining of the upper thread and the bobbin thread is formed in the thickness of the embroidery cloth and cannot be directly observed on the front and back sides of the embroidery cloth. By adjusting the bobbin thread tension and the upper thread tension, the loose upper thread is pulled by the tight bobbin thread to the back side of the embroidery cloth, and the knot formed by the intertwining of the upper thread and the bobbin thread is formed on the back side of the embroidery cloth, so that there is only one upper thread under the stitch trajectory on the front side of the embroidery cloth, and under the stitch trajectory on the back side of the embroidery cloth are the bobbin thread and two upper threads intertwined with the bobbin thread. Secondly, when the stitch unit contains a zigzag shape, in coordination with the zigzag direction, the upper thread will be more pulled to the back side of the embroidery cloth. The smaller the zigzag angle, the greater the resultant pulling force on the upper thread when the bobbin thread tension is constant, and the upper thread is more pulled to the back side of the embroidery cloth. When the difference between the upper thread tension and the bobbin thread tension is extremely large and the zigzag angle is close to 0°, the amount of the bobbin thread is extremely reduced, and almost two upper threads fill the stitch trajectory on the back side of the embroidery cloth.

[0054] 2. Embroidery thread extrusion and stacking: Narrowing the stitch gap makes the stitch gap close to or smaller than the fineness of the embroidery thread, which causes the embroidery thread to be squeezed in the horizontal space and bulge in the vertical space, and then stacking the stitch layers to cause stacking in the vertical space, thereby achieving a high three-dimensional effect.

[0055] 3. The sewing needle and presser foot push the embroidery fabric to bulge towards the back side of the fabric during embroidery operation, and drive more embroidery threads to the back side of the fabric: Each time the embroidery machine drops a needle, the sewing needle and presser foot apply pressure to the embroidery fabric and thread in the direction towards the back side of the fabric, and each needle drop will cause a slight bulge of the fabric towards the back side. The pushing of the sewing needle and presser foot on the thread cancels out part of the force that pulls the bobbin thread to the front side of the fabric. Even if the surface thread tension is adjusted to be more than twice the bobbin thread tension, it is difficult to form a three-dimensional effect on the surface of the embroidery fabric. Therefore, the method described in the present invention is more suitable for forming a high three-dimensional effect on the back side of the embroidery fabric.

[0056] According to the above process flow, 7 embroidery specimens were made using a Japanese JANOME MC550E digital embroidery machine and the thickness of the specimens was measured. The specific steps are as follows:

[0057] (1) Design the specimen reference line through computer embroidery software: In this embodiment, the specimen uses a square pattern with a side length of 4.8 cm, and the square is filled with a square frame reference line. The reference line design drawing is as Figure 2 shown.

[0058] (2) Design a stitch unit containing a broken line shape: The stitch unit is designed in a mesh form, as Figure 3 . The distance between the starting point 1 and the ending point 24 of the needle drop of the stitch unit is the length of the stitch unit. Perpendicular auxiliary lines c and d are drawn respectively from the starting point 1 and the ending point 24 of the needle drop as the starting and ending points of the connection line. Five needle drop points are equally spaced at both ends of the auxiliary lines c and d respectively with the starting point 1 and the ending point 24 of the needle drop as the centers. The straight-line distance between the two outermost needle drop points on the auxiliary line is the outer contour width of the stitch unit. The stitch unit is stitched out in sequence according to the needle drop points 1, 2, 3,..., 24.

[0059] (3) Adjust the stitch gap to be close to or less than the fineness of the embroidery thread: Both the surface thread and the bobbin thread use 40wt. SUPERIORKING TUT embroidery thread, the embroidery needle uses a SCHMETZ brand No. 16 needle, keep the number of stitch layers at 2 layers, the surface thread and bobbin thread tensions are 2g and 20g, and specimens 1#, 2#, and 3# with the outer contour width and length of the stitch unit being 4mm, 2mm, 6mm, 3mm, and 8mm, 4mm respectively are set. The physical specimens are as Figure 4 .

[0060] (4) Select the number of stitch layers: Keep the outer contour width and length of the stitch unit at 6mm and 3mm, the surface thread and bobbin thread tensions at 2g and 20g, and specimens 4#, 2#, and 5# with the number of stitch layers set to 1, 2, and 3 layers respectively. The physical specimens are as Figure 4 .

[0061] (5) Adjust the upper thread tension and the bobbin thread tension of the embroidery machine: Keep the outer contour width and length of the stitch unit at 6 mm and 3 mm respectively, the number of stitch layers at 2 layers, and set three specimens 2#, 6#, and 7# with three pairs of upper thread tensions and bobbin thread tensions of 2 g and 20 g, 5 g and 20 g, and 8 g and 20 g respectively. The physical specimens are as shown in Figure 4 .

[0062] Measure the thickness of 7 embroidery specimens. The measurement standard is based on GB / T 3820-1997 "Determination of the Thickness of Textiles and Textile Products". Using a YG(B)141D thickness gauge, with a presser foot area of 50 mm2, a pressing pressure of 50 kPa, and a pressing time of 10 s, the arithmetic mean of the thicknesses of the 7 embroidery specimens obtained from 5 experiments is as shown in Figure 5 Tables 1, 2, and 3 in

[0063] As can be seen from Table 1, comparing specimens 3#, 2#, and 1#, the thickness of the specimens increases in sequence, indicating that the stitch gap is smaller, so the extrusion between the embroidery threads increases and the three-dimensional effect is better. As can be seen from Table 2, comparing specimens 4#, 2#, and 5#, the thickness of the specimens increases in sequence, indicating that stacking the number of stitch layers can achieve a better three-dimensional effect. As can be seen from Table 3, comparing specimens 7#, 6#, and 1#, the thickness of the specimens increases in sequence, indicating that a smaller ratio of upper thread to bobbin thread tension will cause more upper thread to be pulled to the back of the embroidery fabric, and the three-dimensional effect becomes better.

[0064] From the above experimental results, it can be seen that by designing the stitch unit shape with a zigzag shape, reducing the stitch gap, increasing the number of stitch layers, and reducing the ratio of upper thread to bobbin thread tension of the embroidery machine, the three-dimensional effect of embroidery can be effectively increased.

[0065] The second embodiment of the present invention relates to a digital preparation method for high three-dimensional embroidery products, which is used to simulate the production process of digital embroidered products with a three-dimensional effect similar to hand-embroidered Miao embroidery. The physical object of the hand-embroidered Miao embroidery to be simulated is as shown in Figure 6 , and this hand embroidery includes two embroidery methods with a three-dimensional effect: braid embroidery and ruffled embroidery. Braid embroidery is similar to ruffled embroidery. Both first need to braid 8 embroidery threads into a braid. Braid embroidery is to lay the braid flat and coil it on the embroidery fabric, and its three-dimensional effect is mainly affected by the thickness of the braid; while ruffled embroidery is to fix the braid on the embroidery fabric in a wave-like coiling manner, and its three-dimensional effect is mainly affected by the thickness of the braid and the wave-like coiling method of the braid.

[0066] This embodiment uses a Japanese JANOME MC550E digital embroidery machine for production, and the specific steps are as follows.

[0067] (1) Design the pattern reference line through computer embroidery software: Refer to the physical object of hand-embroidered Miao embroidery and draw the digital embroidery reference line as shown in Figure 7 . In the figure, the solid line is the reference line for ruffled embroidery, and the dashed line is the reference line for braid embroidery.

[0068] (2) Design the stitch unit with a zigzag shape: To simulate the undulating feeling of crepe embroidery, the stitch unit for simulating crepe embroidery is the same as the mesh stitch unit in the first embodiment, such as Figure 3 . To simulate the three-dimensional sense of flatness of the braid in braid embroidery, the stitch unit is designed as a mesh form composed of 4 "×", and the needle dropping sequence of the stitch unit is as Figure 8 . Walk out the stitch unit in sequence according to the needle dropping points 1, 2, 3,..., 28. The straight-line distance between the starting needle dropping point 1 and the ending needle dropping point 28 of the stitch unit is the length of the stitch unit, and the straight-line distance between the needle dropping point 2 and the needle dropping point 13 is the outer contour width of the stitch unit.

[0069] (3) Adjust the stitch gap to be close to or less than the fineness of the embroidery thread: Select the FUJIX KING STAR embroidery thread of 120D / 2, which is close to the fineness of hand embroidery thread, as the top thread and the bobbin thread, and prepare 4 colors similar to the hand embroidery colors. The embroidery needle uses the No. 9 needle of the SCHMETZ brand. Measure that the braid width of the crepe embroidery in Miao embroidery is about 2.8 mm, and the length of one wave is 1 mm. The braid used in the braid embroidery of Miao embroidery is the same as that of the crepe embroidery, and the braid width is also 2.8 mm, such as Figure 6 . Adjust the outer contour width of the stitch unit for simulating crepe embroidery to be equal to the braid width of hand-embroidered crepe embroidery, and the length of the stitch unit to be equal to the length of one wave of hand-embroidered crepe embroidery, that is, set the outer contour width and length of the stitch unit for simulating crepe embroidery to be 2.8 mm and 1 mm respectively. Similarly, adjust the outer contour width and length of the stitch unit for simulating braid embroidery to be 1.5 mm and 2.5 mm respectively.

[0070] (4) Select the number of stitch layers: 2 layers.

[0071] (5) Adjust the top thread tension and the bobbin thread tension of the embroidery machine: The top thread tension and the bobbin thread tension are 3.4 g and 13 g respectively.

[0072] (6) Embroidery operation: Taking the reverse side of the embroidery cloth as the front of the embroidered product, obtain the digital embroidery physical map as Figure 9 shown.

[0073] At the embroidery machine speed of 400 stitches per minute, it only takes 36 minutes to complete this embroidered product. Without complex skill training, such digital three-dimensional embroidery imitating the crepe embroidery and braid embroidery of Miao embroidery can be mass-produced repeatedly.

[0074] By matching 5 digital embroidery parameters including the stitch unit, the stitch gap, the number of stitch layers, the fineness of the embroidery thread, and the top thread and bobbin thread tensions, the present invention can achieve a three-dimensional embroidery effect with a thickness of 2 - 3 mm. And by specially designing the stitch unit, it can imitate the hand embroidery techniques such as crepe embroidery and braid embroidery of Miao embroidery. By setting the process parameters of high three-dimensional digital embroidery and through the automated operation of the digital embroidery machine, compared with hand embroidery, it saves time and effort, and without years of skill training, an embroidered product with good simulation degree and three-dimensional sense can be produced.

[0075] The above are only the preferred specific embodiments of the present invention, but the design concept of the present invention is not limited thereto. Any non-substantive modification of the present invention using this concept shall fall within the scope of infringement of the protection scope of the present invention.

Claims

1. A digital preparation method for high three-dimensional embroidery, characterized in that, Including the following steps: Design a pattern reference line; Design a stitch unit, the stitch unit including a plurality of stitches forming a broken line; Adjust the upper thread tension and the bobbin thread tension of the embroidery machine so that the twisting point of the upper thread and the bobbin thread is formed on the reverse side of the embroidery cloth; Embroider a plurality of the stitch units on the embroidery cloth, the stitch units being arranged in sequence on the pattern reference line, and forming an embroidery with high three-dimensionality on the reverse side of the embroidery cloth.

2. The preparation method according to claim 1, characterized in that, When designing the stitch unit, by setting a stitch gap, the embroidery thread in the stitch unit is squeezed, and the stitch gap is the vertical distance from any needle drop point in the stitch unit to the adjacent stitch of the any needle drop point.

3. The preparation method according to claim 2, characterized in that, The stitch gap is smaller than the fineness of the embroidery thread.

4. The preparation method according to claim 1, wherein, Between the step of designing the stitch unit and the step of embroidering a plurality of the stitch units on the embroidery cloth, there is also a step of adjusting the length and the outer contour width of the stitch unit so that the embroidery thread in the stitch unit is squeezed.

5. The preparation method according to claim 1, wherein, The angle formed by the stitches of the broken line is less than 90°; 6. The preparation method according to claim 1, characterized in that, The bobbin thread tension is not less than 2 times the upper thread tension.

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