A slitting method and slitting device

Abstract

The application provides a cutting bed aligning method and an aligning device, wherein the cutting bed aligning method comprises the following steps: step 1: dividing the outer contour line of a preset cutting piece into sewing lines and non-sewing lines, and giving an identification to each sewing line; the sewing lines that need to be sewn together have the same identification; step 2: after the laying of the fabric is completed, obtaining the pattern information of the fabric, and transmitting the pattern information of the fabric to a layout software; step 3: aligning the cutting piece data in step 1 on the fabric data in step S2 through the layout software; during the alignment, the two sewing lines with the same identification automatically keep the horizontal coordinate or the vertical coordinate of the corresponding points unchanged. The identification of the sewing lines can ensure the aligning standard of the cutting pieces that are sewn together.

Description

Technical Field

[0001] This invention relates to the field of garment manufacturing technology, and more specifically to a method and apparatus for aligning stripes on a cutting bed. Background Technology

[0002] All types of clothing have strict requirements for "matching stripes and checks," and different products have different requirements. For example, for trousers, firstly, the horizontal stripes must be aligned, and then the front and back seams, trouser seams, placket, side pocket patches, and pocket flaps must all be aligned; if there are vertical stripes, the left and right sides of the trousers must also be symmetrical. For jackets, the front, back, left, and right panels must all be symmetrical, and the horizontal stripes must be aligned with the sleeves, collar, placket, and body. As for skirts, as long as the front and back panels are symmetrical and the side seams are aligned, it is acceptable.

[0003] To achieve the goal of matching patterns and stripes, three main aspects should be considered: First, the quality of the fabric must be strictly controlled, as it is the source of all quality issues. Whether it is knitted or woven fabric, there is always some degree of weft skew. If the skew is severe, it will be impossible to achieve "pattern and stripe matching". If weft skew is found in the greige fabric before cutting, it can be corrected by shaping. Second, close cooperation is needed in the three processes of laying out the fabric, laying it out, and cutting to complete the "pattern and stripe matching" process. Third, the daily management of sewing workers should be strengthened to ensure "pattern and stripe matching" during sewing.

[0004] The existing technology, as disclosed in patent CN109763312B, uses an image scanning device to capture images of the fabric. By positioning the fabric image and simultaneously setting identical positioning symbols in garment CAD software for pattern making and layout, automatic layout is achieved through alignment using these positioning marks. The output signal is transmitted to an automatic cutting bed for automatic cutting, significantly improving cutting accuracy. However, it does not detect whether the cut pieces align after sewing, which may lead to issues such as misalignment after layout and cutting. Figure 2 As shown, this is a case where the stripes are misaligned and the colors of the stripes are reversed.

[0005] If the pattern matching is not considered during sewing when cutting the fabric pieces, the resulting garments will be difficult to match the pattern matching and will be unsuitable for garment factories with strict requirements for garment quality.

[0006] Therefore, how to lay out the striped fabric pieces and ensure the alignment accuracy of the stripes when they are sewn together is a problem that needs to be solved. Summary of the Invention

[0007] The purpose of this invention is to provide a stripe alignment method and device for cutting beds, which can ensure the alignment accuracy when striped fabrics are sewn together.

[0008] To achieve the above objectives, the present invention provides a method for cutting strips on a cutting bed, comprising:

[0009] Step 1: Divide the outer contour of the pre-made pattern into sewn lines and non-sewn lines, and assign a label to each sewn line. Sewn lines that need to be sewn together have the same label.

[0010] Step 2: After the fabric is laid out, obtain the pattern information of the fabric and transfer the pattern information of the fabric to the layout software;

[0011] Step 3: Arrange the cut piece data from Step 1 onto the fabric data from Step S2 using layout software; during layout, two seam lines with the same seam line markings will automatically keep the corresponding horizontal or vertical coordinates unchanged.

[0012] In an optional embodiment, step 3, before typesetting, further includes:

[0013] Pre-layout in layout software; during pre-layout, the bottom is the fabric pattern, select any piece of fabric, select feature points on the piece of fabric, and then lay out the piece of fabric on the fabric pattern.

[0014] Project the layout of the cut pieces onto the corresponding positions on the fabric on the cutting table, and observe whether the positions of the feature points on the fabric are consistent with those in the pre-layout.

[0015] If they match, continue with the layout of other cut pieces in the layout software;

[0016] If there is a discrepancy, the projection equipment should be checked or the fabric data should be corrected to ensure that the actual projection and layout are consistent.

[0017] In an optional embodiment, there are two feature points, which are located on the stripe outline and on the outer contour of the fabric piece.

[0018] In an optional embodiment, the fabric data correction includes:

[0019] In the layout software, the shape of the cut piece is scaled until the feature points on the projected cut piece are in the same position on the fabric as in the pre-layout.

[0020] Then, the shape of the cut piece is restored, and the scaling ratio of the fabric in the layout software is determined according to the scaling ratio of the cut piece, so as to correct the fabric data.

[0021] In the optional scheme, the center point of the pre-laid pattern piece coincides with the center point of the fabric, and when scaling the shape of the pattern piece, the scaling is performed with the center point as the base point.

[0022] In the optional scheme, during layout, the cut pieces are sorted from most to least number of sewing lines, and the coordinates of the intersection points of each sewing line and the fabric are determined.

[0023] When the fabric is laid out to a piece that matches the sewing line markings at the confirmed coordinates, the movement of that piece is restricted by preset rules.

[0024] In an optional embodiment, the method further includes: manually removing movement restrictions during pattern layout as needed.

[0025] In the optional solution, when laying out the pattern, for cut pieces of the same shape and size, if it is necessary to continue laying out the pattern longitudinally, the intersection of the outer contour of the cut piece and the stripe of the fabric is used as the base point to copy the pattern of the cut piece to the new position.

[0026] The present invention also provides a cutting bed strip-aligning device, comprising:

[0027] The sewing thread marking module is used to divide the outer contour lines of the preset pattern into sewing threads and non-sewing threads, and to assign a mark to each sewing thread. Sewing threads that need to be sewn together have the same mark.

[0028] The acquisition module is used to acquire the pattern information of the fabric after the fabric is laid out, and then transmit the pattern information of the fabric to the typesetting software.

[0029] The layout module uses layout software to arrange the cut piece data obtained by the sewing thread identification module on the fabric data obtained by the acquisition module; during layout, two sewing threads with the same sewing thread identification automatically keep the corresponding point's horizontal coordinate unchanged or vertical coordinate unchanged.

[0030] The beneficial effects of this invention are as follows:

[0031] This invention ensures the alignment of sewn-together fabric pieces by marking the stitch lines, and avoids issues such as… Figure 2 As shown, the color is reversed. This means that even when considering the matching of stripes during sewing, the material layout speed remains high, and the matching accuracy is also high, even for stripes with varying shades. Attached Figure Description

[0032] The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0033] Figure 1 This is a flowchart of the steps of the strip-aligning method on the cutting bed in one embodiment of the present invention.

[0034] Figure 2 This is a diagram illustrating how stripes are not aligned front and back and the colors of the stripes are reversed when sewing striped fabric.

[0035] Figure 3 This is a schematic diagram of two cut pieces being sewn together in one embodiment of the present invention.

[0036] Figure 4 and Figure 5This is a schematic diagram of selecting a feature point in one embodiment of the present invention.

[0037] Figure 6 and Figure 7 This is a schematic diagram of selecting two feature points in one embodiment of the present invention.

[0038] Figure 8 This is a schematic diagram of the fabric piece scaling based on the stripe containing the red line as the base point in one embodiment of the present invention.

[0039] Figure 9 This is a schematic diagram showing the fabric divided into three zones in one embodiment of the present invention.

[0040] Figure 10 This is a schematic diagram of material discharge using the base point translation method in one embodiment of the present invention. Detailed Implementation

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description and drawings. However, it should be noted that the concept of the technical solution of the present invention can be implemented in many different forms and is not limited to the specific embodiments described herein. The accompanying drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0042] It should be understood that when an element or layer is referred to as "on," "adjacent to," "connected to," or "coupled to" other elements or layers, it may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and / or portions, these elements, components, areas, layers, and / or portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this invention, the first element, component, area, layer, or portion discussed below may be referred to as the second element, component, area, layer, or portion.

[0043] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein for convenience of description to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, then the element or feature described as “below” or “under” the other element or feature will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or otherwise) and the spatial descriptive terms used herein will be interpreted accordingly.

[0044] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. When used herein, the singular forms “a,” “an,” and “the” are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising” and / or “including,” when used in this specification, identify the presence of the stated features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups. When used herein, the term “and / or” includes any and all combinations of the associated listed items.

[0045] Example 1

[0046] Reference Figures 1 to 10 This embodiment provides a method for cutting strips on a cutting bed, including:

[0047] Step 1: Divide the outer contour of the pre-made pattern into sewn lines and non-sewn lines, and assign a label to each sewn line. Sewn lines that need to be sewn together have the same label.

[0048] Step 2: After the fabric is laid out, obtain the pattern information of the fabric and transfer the pattern information of the fabric to the layout software;

[0049] Step 3: Arrange the cut piece data from Step 1 onto the fabric data from Step S2 using layout software; during layout, two seam lines with the same seam line markings will automatically keep the corresponding horizontal or vertical coordinates unchanged.

[0050] Specifically, in step 1, a single fabric piece has multiple outer contour lines. Some of these contour lines need to be sewn together with other fabric pieces, while others do not. The contour lines that need to be sewn together are called sewing lines, and the contour lines that do not need to be sewn together are called non-sewing lines. In other words, sewing lines refer to the contour lines that sew two fabric pieces together. (Refer to...) Figure 3 The red lines are sewing lines. A specific method for marking sewing lines is as follows: Label the pieces needed for a garment, such as piece 1, piece 2, piece 3, etc. Assuming piece 1 and piece 2 need to be sewn together, there are two sewing lines. These two sewing lines are labeled 1.2-1 and 1.2-2. The numbers in 1.2-1, from left to right, represent piece 1, piece 2, and the first sewing line, respectively.

[0051] In step 2, after the fabric is laid out on the cutting table, the fabric pattern information is obtained through a camera or scanning device and then transmitted to the typesetting software.

[0052] Step 3 includes:

[0053] D1. Pre-layout: Pre-layout is performed in the layout software; during pre-layout, the bottom is the fabric pattern, select any piece of fabric, select feature points on the piece of fabric, and then lay out the piece of fabric on the fabric pattern (only one piece of fabric needs to be laid out). The pattern of the piece of fabric only has the outer outline and no internal stripes.

[0054] D2. Pre-projection: Project the layout of the cut pieces onto the corresponding positions of the fabric on the cutting table, and observe whether the positions of the feature points on the projected cut pieces are consistent with those in the pre-layout (to check whether the fabric data obtained in step 2 and the projection device are working properly). If they are consistent, continue to lay out other cut pieces in the layout software. If they are inconsistent, check the projection device or correct the fabric data to make the actual projection and layout consistent.

[0055] Feature point selection: can be as follows Figure 4 The selected point is on the striped outline. If, after projection, the point is not on the outline, an offset occurs; however, if... Figure 5 As shown, since only one point is selected, without other determining factors (such as different stripe colors, which can indicate the direction of offset, or different stripe widths, etc.), it is difficult to determine whether the offset originates from the left edge or the right edge. Therefore, the optimal approach is as follows: Figure 6 As shown (the dotted lines represent the fabric pattern in the layout software, and the solid lines represent the cut piece outline and feature points), the feature points need to be on both the stripe outline and the outer contour of the cut piece. If projected as shown... Figure 7 (The dashed lines represent the actual fabric pattern on the cutting table, and the solid lines represent the projected outline and feature points of the cut piece.) As shown, feature points may shift. This shift can be used to determine the difference between the actual fabric pattern and the pattern obtained by the software; this is an example. Figure 6 There are two stripes between the two points in the middle. Figure 7 The distance between the two points is less than two stripes, indicating that the actual stripe width of the fabric pattern is larger than the data received by the layout software. The fabric data in the layout software is scaled proportionally in width.

[0056] The fabric data in the layout software is obtained after scanning. Unlike ordinary fabrics, for striped fabrics, if the fabric image data is stretched or compressed in a certain direction due to scanning or photography equipment (such as equipment failure, photography angle deviation, equipment error, etc.), it will cause deviations when the cut pieces are projected onto the actual fabric for cutting. This will lead to failure in matching the stripes when sewing the cut pieces, which is not suitable for high-quality garment factories. Therefore, it is necessary to pre-layout and pre-projection to check whether the data collected by the equipment is qualified. If it is not qualified, the projection equipment can be checked and calibrated. If the unqualified result is due to the equipment's own error and it is difficult to correct it from the equipment itself, data correction can be used directly to accommodate all reasons for unqualified results.

[0057] Fabric data correction: In the layout software, the shape of the cut pieces is scaled. In this embodiment, refer to... Figure 7 The pattern piece is stretched horizontally by a certain proportion (the vertical coordinates of each point remain unchanged, while the horizontal coordinates are scaled) until the feature points on the pattern piece projection are positioned on the fabric in the same way as in the pre-layout. Then, the pattern piece shape is restored, and the fabric scaling ratio in the layout software is determined based on the pattern piece scaling ratio to correct the fabric data. The center point of the pattern piece in the pre-layout and pre-projection coincides with the center point of the fabric; the aforementioned scaling is performed using the center point as the base point. For example, stripes: the scaling base point is on a line equidistant from the two feature points; see [link to relevant documentation]. Figure 8 The red line. Assuming that when the shape of the cut piece is scaled, the horizontal coordinate of the cut piece is multiplied by (100+a)%, so that the feature point is located on the stripe outline, then when the fabric data is corrected, the horizontal coordinate of each point of the fabric pattern is multiplied by 100 / (100+a).

[0058] During formal layout, the fabric pieces are sorted from most to least numerous stitches, and the coordinates of the intersections of each stitch with the fabric are determined. When a piece is laid out that matches a stitch mark with the confirmed coordinates, its movement is restricted by preset rules. Initially, selecting the piece with the highest number of stitches allows for the identification of numerous stitch intersections in the early stages of layout, such as prioritizing the back piece of the garment. Later, when a pattern of a piece with a stitch mark matching the confirmed coordinates appears, its movement is restricted; that is, two lines with the same stitch mark automatically maintain the same horizontal or vertical coordinate at their corresponding points. Preferably, it moves along the stripe lines that need alignment (vertical movement) based on the confirmed stitch marks. For simple fabric patterns, the vertical coordinate can remain unchanged, meaning the piece can move horizontally, for example... Figure 6 To obtain uniform stripes, move laterally from one of the feature points as a base point, ensuring the base point eventually falls on the outer edge of another stripe. Ideally, move along the direction of the stripe's extension, as this makes it easier to ensure the correct stripe alignment.

[0059] If the material is discharged as follows Figure 9The fabric is divided into three zones, each with the same layout method. Once one zone is laid out, the other two zones can be automatically generated. During automatic generation, the aforementioned movement restrictions on the cut pieces are lifted; that is, it is not necessary to ensure that the horizontal or vertical coordinates of all stitches with the same markings in the three zones remain unchanged. Furthermore, the movement restrictions on the cut pieces can be lifted through the control panel. After lifting, the stitches on the previously laid-out cut pieces will no longer affect the subsequent layout process, which will be handled as a completely new layout process, using the same method as described above.

[0060] When laying out pattern pieces of a certain shape, if after arranging several sets along the horizontal axis there is no space left, but the required quantity is not yet met, and vertical rearrangement is needed, this may cause changes in both the horizontal and vertical coordinates along the seam line. Therefore, the movement restrictions during pattern piece layout can be manually lifted as needed. When rearranging vertically, it is important to ensure that the fabric patterns covering the pattern pieces are consistent; ideally, refer to [reference needed]. Figure 10 The base point translation method can be used: select the intersection of the outer contour and the stripe, and then use this intersection as the base point to copy the pattern of the cut piece.

[0061] This embodiment uses the sewing thread as the reference for stripe alignment, resulting in more accurate results and ensuring stripe alignment. Two sewing threads with the same markings automatically maintain the same horizontal or vertical coordinates for their corresponding points, ensuring that even if the stripe widths are the same but the colors are different, the colors will not be reversed during layout. Through pre-layout, pre-projection, and fabric data correction, the influence of the fabric on the results can be reduced. During the formal layout, the selection of the first cut piece, the coordination of zone layout and the removal of movement restrictions ensures stripe alignment while maximizing layout speed and providing a certain degree of layout freedom.

[0062] Example 2

[0063] This embodiment provides a strip-aligning device for a cutting bed, including:

[0064] The sewing thread marking module is used to divide the outer contour lines of the preset pattern into sewing threads and non-sewing threads, and to assign a mark to each sewing thread. Sewing threads that need to be sewn together have the same mark.

[0065] The acquisition module is used to acquire the pattern information of the fabric after the fabric is laid out, and then transmit the pattern information of the fabric to the typesetting software.

[0066] The layout module uses layout software to arrange the cut piece data obtained by the sewing thread identification module on the fabric data obtained by the acquisition module; during layout, two sewing threads with the same sewing thread identification automatically keep the corresponding point's horizontal coordinate unchanged or vertical coordinate unchanged.

[0067] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A method for cutting strips on a cutting table, characterized in that, include: Step 1: Divide the outer contour of the pattern piece into sewn lines and non-sewn lines, and assign a label to each sewn line. Sewn lines that need to be sewn together should have the same label to obtain pattern data. Step 2: After the fabric is laid out, obtain the pattern information of the fabric and transmit the pattern information of the fabric to the typesetting software to obtain the fabric data. The fabric is a striped fabric. Step 3: Arrange the cut piece data from Step 1 onto the fabric data from Step S2 using layout software; during layout, two seam lines with the same seam line markings will automatically keep the corresponding horizontal or vertical coordinates unchanged. In step 3, before typesetting, the method further includes: Pre-layout in layout software; during pre-layout, the bottom is the fabric pattern, select any piece of fabric, select feature points on the piece of fabric, and then lay out the piece of fabric on the fabric pattern. Project the layout of the cut pieces onto the corresponding positions on the fabric on the cutting table, and observe whether the positions of the feature points on the fabric are consistent with those in the pre-layout. If they match, continue with the layout of other cut pieces in the layout software; If there is a discrepancy, the projection equipment should be checked or the fabric data should be corrected to ensure that the actual projection and layout are consistent. The fabric data correction includes: In the layout software, the shape of the cut piece is scaled until the feature points on the projected cut piece are in the same position on the fabric as in the pre-layout. Then the shape of the cut piece is restored, and the scaling ratio of the fabric in the layout software is determined according to the scaling ratio of the cut piece, and the fabric data is corrected. There are two feature points, which are located on the stripe outline and on the outer contour of the fabric piece; The center point of the pre-laid pattern piece coincides with the center point of the fabric. When scaling the shape of the pattern piece, the center point is used as the base point for scaling. When laying out the pattern, arrange the pattern pieces from most to least number of seams and determine the coordinates of the intersection points of each seam with the fabric. When the fabric is laid out to a piece that matches the sewing line markings of the confirmed coordinates, the movement of the piece is restricted by a preset rule, that is, two lines with the same sewing line markings automatically keep the corresponding point's horizontal or vertical coordinates unchanged.

2. The cutting bed strip-aligning method as described in claim 1, characterized in that, The method also includes: manually removing movement restrictions during pattern layout as needed.

3. The cutting bed strip-aligning method as described in claim 1, characterized in that, When laying out patterns, for cut pieces of the same shape and size, if it is necessary to continue laying out patterns longitudinally, use the intersection of the outer contour of the cut piece and the stripe of the fabric as the base point and copy the pattern of the cut piece to the new position.

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