WO2022158251A1 - インバースプレーティング用補正データの生成方法、及び生成システム - Google Patents

インバースプレーティング用補正データの生成方法、及び生成システム Download PDF

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Publication number
WO2022158251A1
WO2022158251A1 PCT/JP2021/048124 JP2021048124W WO2022158251A1 WO 2022158251 A1 WO2022158251 A1 WO 2022158251A1 JP 2021048124 W JP2021048124 W JP 2021048124W WO 2022158251 A1 WO2022158251 A1 WO 2022158251A1
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WIPO (PCT)
Prior art keywords
knitting
correction data
switching
yarn
plating
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Ceased
Application number
PCT/JP2021/048124
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English (en)
French (fr)
Japanese (ja)
Inventor
公一 寺井
一樹 保田
学 由井
佳史 登尾
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Shima Seiki Mfg Ltd
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Shima Seiki Mfg Ltd
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Publication date
Application filed by Shima Seiki Mfg Ltd filed Critical Shima Seiki Mfg Ltd
Priority to KR1020237028066A priority Critical patent/KR20230132830A/ko
Priority to CN202180091336.1A priority patent/CN116745477A/zh
Priority to JP2022577064A priority patent/JPWO2022158251A1/ja
Priority to EP21921352.7A priority patent/EP4283031A4/en
Publication of WO2022158251A1 publication Critical patent/WO2022158251A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/10—Patterned fabrics or articles
    • D04B1/12—Patterned fabrics or articles characterised by thread material
    • D04B1/126—Patterned fabrics or articles characterised by thread material with colour pattern, e.g. intarsia fabrics
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B15/00—Details of, or auxiliary devices incorporated in, weft knitting machines, restricted to machines of this kind
    • D04B15/66—Devices for determining or controlling patterns ; Programme-control arrangements
    • D04B15/68—Devices for determining or controlling patterns ; Programme-control arrangements characterised by the knitting instruments used
    • D04B15/70—Devices for determining or controlling patterns ; Programme-control arrangements characterised by the knitting instruments used in flat-bed knitting machines
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B35/00—Details of, or auxiliary devices incorporated in, knitting machines, not otherwise provided for
    • D04B35/02—Knitting tools or instruments not provided for in group D04B15/00 or D04B27/00
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B37/00—Auxiliary apparatus or devices for use with knitting machines
    • D04B37/02—Auxiliary apparatus or devices for use with knitting machines with weft knitting machines
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B7/00—Flat-bed knitting machines with independently-movable needles
    • D04B7/24—Flat-bed knitting machines with independently-movable needles for producing patterned fabrics
    • D04B7/26—Flat-bed knitting machines with independently-movable needles for producing patterned fabrics with colour patterns

Definitions

  • This invention relates to generation of correction data for inverse plating.
  • Plating means feeding two knitting yarns from a carrier to the needles of a weft knitting machine and knitting one yarn as the main yarn and the other as the plating yarn. Knitting including switching the allocation of the main yarn and the plating yarn is called inverse plating, and kickback of the carrier performed by intarsia is not included in inverse plating.
  • the correction data for inverse plating is, for example, data specifying the timing to start switching the allocation of the main yarn and the base yarn.
  • Patent Document 1 (EP3315642B, JP6562,890B) proposes performing inverse plating using a difference in tension applied to a pair of knitting yarns.
  • the yarn with the higher tension is positioned lower in the hook of the needle and becomes the main yarn, and the yarn with the lower tension is positioned upper in the hook of the needle and is the plating yarn. Therefore, if the tension is switched during knitting, the main yarn and the plating yarn can be switched.
  • Patent document 2 (JP2018-178, 292A) proposes switching between the main yarn and the coating yarn by a movable sinker.
  • a current problem in inverse plating is to accurately switch the main yarn and the plating yarn at a desired position, especially to reduce variations in the switching position.
  • the correction data for this purpose are affected by the combination of carriers, the knitting direction, the positional relationship between the carriers in the front and back directions, the knitting speed, the knitting direction, the needle beds to be used, etc., and are not data that can be easily determined. . Further, in order to determine the correction data, it is necessary to perform test knitting (trial knitting) many times with the flat knitting machine. Therefore, it is impractical to manually determine appropriate correction data.
  • Patent Document 3 EP2246,466B, WO2009/081,583
  • Patent Document 3 does not refer to inverse plating.
  • An object of the present invention is to enable easy generation of correction data for performing inverse plating with less bleeding. This makes inverse plating more practical.
  • correction data for inverse plating In the method of generating correction data for inverse plating of the present invention, a weft knitting machine is used, two knitting yarns are supplied from at least one carrier, one is knitted as a main yarn and the other as a plate yarn, and Correction data is generated for inverse plating in which a carriage is moved in one direction to knit a knitted fabric, and at the same time, the allocation of the main yarn and the plating yarn is switched without interrupting the knitting.
  • the present invention is characterized in that correction data for switching is obtained using a learned regression analysis apparatus in which the knitting condition at the time of switching is used as an explanatory variable and correction data for switching is used as an objective variable.
  • a system for generating correction data for inverse plating uses a flat knitting machine, feeds knitting yarns from a carrier, performs knitting using one as the main yarn and the other as the plating yarn, and performs knitting using the main yarn and the plating yarn. , and generate correction data for inverse plating.
  • the present invention is characterized by including a learned regression analysis device that uses the knitting conditions at the time of switching as explanatory variables and correction data for switching as objective variables, and generates correction data from the knitting conditions at the time of switching.
  • a learned regression analysis device is used to generate correction data from the knitting conditions at the time of switching between the main yarn and the plating yarn in inverse plating. Since the correction data is obtained by the regression analysis device, it is not necessary to manually obtain the correction data for all the knitting conditions. By using regression analysis, it is possible to obtain correction data of a level that can be actually used by fine adjustment by trial knitting.
  • a knitted fabric is trial-knitted with a flat knitting machine according to the switching correction data obtained from the regression analysis device, and the switching correction data is finely adjusted based on the trial knitting result. Since there are elements that are not taken into account in the regression analysis, such as the type of yarn used for knitting, the lot, etc., there is no guarantee that correct inverse plating can be performed from the beginning with correction data. Therefore, by performing trial knitting and fine adjustment of correction data, it is possible to perform inverse plating with less bleeding.
  • the camera captures an image of the knitted fabric that has been trial-knitted
  • the image recognition means recognizes the switching position of the knitting yarn
  • the correction data for switching is finely adjusted automatically or manually.
  • the correction data can be easily fine-tuned.
  • correction data can be finely adjusted almost automatically.
  • two self-propelled carriers are caused to travel synchronously with the carriages, and by switching the leading/trailing relationship between the self-propelled carriers along the direction of travel of the carriages, the main Toggles the assignment of threads and splints.
  • the knitting conditions at the time of switching are ⁇ A carrier to be corrected, ⁇ Knitting speed, ⁇ Needle bed used for knitting, ⁇ Knitting direction, - The type of whether the carrier to be corrected is switched from leading to trailing or from trailing to leading, and - Whether the carrier to be corrected is on the front side or the back side with respect to the other paired carrier. types, including
  • Two self-propelled carriers are caused to travel synchronously with the carriages, and the assignment of the main yarn and the base yarn is switched by switching the leading/trailing relationship between the self-propelled carriers along the traveling direction of the carriages. , it is possible to reduce bleeding of the main yarn and the base yarn.
  • the knitting conditions related to the correction data are the six types described above, and there are an extremely large number of combinations thereof. Appropriate correction data can be obtained by using a regression analysis device for a large number of combinations.
  • the regression analysis device is a support vector regression analysis device. Since the correction data for inverse plating does not linearly depend on the explanatory variables, it is preferable that it is suitable for analysis of nonlinear phenomena, and among them, a support vector regression analyzer is preferable. The inventors have successfully obtained suitable correction data using a support vector regression analyzer.
  • FIG. 4 is a diagram schematically showing a mechanism for fine adjustment of correction data in the embodiment;
  • Flowchart showing an algorithm for creating correction data for inverse plating in an embodiment A diagram schematically showing the switching position of the main yarn and the plating yarn in inverse plating.
  • a diagram schematically showing switching between the main yarn and the base yarn by switching the leading/trailing relationship of the carrier in inverse plating. 6 schematically shows an example in which the movement direction of the carrier is reversed in addition to the switching in FIG.
  • FIG. 8 is a diagram schematically showing an example in which reversal motion of the height of the yarn feeder is added to the switching in FIG.
  • FIG. 10 is a diagram showing another example of learning data and predicted values of objective variables of the support vector regression analyzer (SVR); Photograph of a knitted fabric subjected to inverse plating using the correction data obtained in FIGS. 9 and 10
  • FIG. 1 to 11 show a design system 2 (system for generating correction data for inverse plating) of the embodiment and a method for generating correction data.
  • the design system 2 is connected to one or more flat knitting machines 4, and is provided with a learned support vector regression analysis device (SVR) 8 program and data for regression analysis from a server 5, Implemented in design system 2.
  • the SVR 8 uses the switching condition for the main yarn and the plating yarn extracted from the knitting data as an explanatory variable, and the position (correction data) at which the switching operation is started as an objective variable.
  • SVR8 uses the switching condition for the main yarn and the plating yarn extracted from the knitting data as an explanatory variable, and the position (correction data) at which the switching operation is started as an objective variable.
  • correction data for inverse plating can be automatically generated.
  • An unlearned SVR may be installed in the design system 2, the SVR may learn within the design system 2, and data for regression analysis may be generated within the design system 2.
  • the regression analysis device may be one that uses a neural network, kNN (k nearest neighbor method), etc., in addition to SVR8.
  • Correction data for inverse plating which is an objective variable in regression analysis, is strongly nonlinear with respect to explanatory variables. For this reason, SVR, neural network, kNN, etc. are preferable to multiple regression analysis devices, and SVR is particularly preferable.
  • the memory 10 stores drive data (knitting data) for the weft knitting machine 4.
  • the knitting data includes a position for switching between the main yarn and the plating yarn in inverse plating, and also supplies the main yarn and the plating yarn. It contains data on conditions for switching between the main yarn and the base yarn, such as the number of a pair of carriers to be connected, their leading/trailing relationship, front/back relationship, knitting speed, knitting direction, needle beds to be used, and the like.
  • the image recognition device 11 recognizes, from the image of the camera 14 provided in the flat knitting machine 4, the position where the main yarn and the plating yarn are switched during trial knitting.
  • a general-purpose memory 12 stores correction data and the like for switching between the main yarn and the base yarn. Any type of flat knitting machine 4 may be used, and the design system 2 may be provided in the server 5 instead of being provided on the side of the flat knitting machine 4 as shown in FIG.
  • the flat knitting machine 4 includes, for example, a pair of front and rear needle beds 15, 15, and a carriage 16 for operating the needles on the needle beds 15, and supplies knitting yarn to the needles from self-propelled carriers 25, 26 or the like to perform inverse plating. I do.
  • the camera 14 is mounted, for example, on a carriage 16 or self-propelled carriers 25, 26 or the like.
  • the carrier may be carried by the carriage 16 instead of the self-propelled type.
  • the carrier also generally feeds knitting yarn from a yarn feeder below. Further, if one carrier is provided with a plurality of yarn feeders and provided with a mechanism for switching the relative heights of the yarn feeders, the number of the carrier may be one.
  • a controller 18 for the flat knitting machine 4 controls the carriage 16, self-propelled carriers 25, 26, etc. of the flat knitting machine 4 based on the knitting data.
  • the image recognition device 11 in the design system 2 recognizes the position where the main thread and the cover thread are switched, and outputs the error from the target position of the switching. Therefore, for example, the correction data is finely adjusted by this error.
  • the error is processed by an AI (machine learning device) such as SVR8 to finely adjust the correction data. In either case, trial knitting is repeated as necessary. By doing so, correction data can be generated almost automatically, fine adjustment can be made by trial knitting without human intervention, and appropriate correction data can be obtained.
  • the correction data can also be finely adjusted by the operator manually viewing the image from the camera 14 or visually checking the knitted fabric without going through the design system 2 .
  • FIG. 3 shows learning of SVR 8 (prediction model creation), porting to design system 2 (steps S1 to step S3), and generation of correction data (steps S4 to S9).
  • the following explanatory variables are related to correction data for inverse plating, that is, data for each knitting condition regarding the switching operation between the main yarn and the base yarn.
  • - Carrier number Numbers assigned to the carriers 25, 26, etc. in order from the front to the back of the flat knitting machine 4 indicate the positions of the carriers. 1 to 8 in the examples.
  • Front/rear Between a pair of carriers for switching between the main yarn and the splint yarn, the carrier to be corrected is located in the front or the back when viewed from the front of the flat knitting machine 4 .
  • Leading/trailing Between the above pair of carriers, there are two types of carriers to be corrected: leading or trailing.
  • ⁇ Needle bed Two types depending on whether the front or rear needle bed is used for knitting. When there are a total of four needle beds, front and back and top and bottom, there are four types of front and back and top and bottom needle beds.
  • - Knitting direction The knitting direction when switching between the main yarn and the plating yarn.
  • - Knitting speed The knitting speed (moving speed of the carriage) at which the main yarn and the plating yarn are switched.
  • the SVR in the server 5 generates, through learning, a prediction model that outputs appropriate correction data as objective variables for the input combination of explanatory variables and correction data (step S2).
  • the trained SVR 8 is generated, and the generated trained SVR (SVR program and regression analysis data) is implemented in the design system 2 placed in the knitting factory or the like via a communication line or the like (step S3).
  • the correction data are strongly nonlinear with respect to the explanatory variables. For this reason, SVR, neural network, kNN, etc. suitable for non-linear phenomena are preferable for the regression analysis device.
  • the design system 2 extracts explanatory variables related to knitting yarn switching in inverse plating from the knitting data (step S4).
  • An explanatory variable is input to the SVR 8 to obtain an objective variable (predicted value of correction data) (step S5). Since switching of knitting yarns in inverse plating is usually performed a plurality of times for knitting one knitted fabric, correction data is output for each knitting condition at the time of switching.
  • Input correction data according to the predicted value from the design system 2 to the flat knitting machine 4, and perform test knitting (trial knitting) (step S6).
  • the camera 14 mounted on a self-propelled carrier or carriage 16 takes an image of the knitted stitch, and the position where the main yarn and the plating yarn are exchanged is confirmed by the image from the camera (step S7). Then, if the switching position deviates from the target, the correction data is finely adjusted so as to correct the correction data by this error (step S8).
  • the knitted fabric is knitted again, and when appropriate correction data is obtained, the trial knitting is terminated and the correction data is output (step S9). Fine adjustment of correction data may be performed manually or automatically.
  • the knitted fabric may be checked manually without using the camera 14 .
  • Trial knitting after fine adjustment may be omitted.
  • Fig. 4 schematically shows switching between the main yarn and the plating yarn in inverse plating. Assuming that the line AA in the drawing is the target position for switching, the error is how much the actual switching position deviates from the line AA to the left or right. Simply, the correction data should be finely adjusted by this error. In more complicated processing, errors may be processed by AI (machine learning device).
  • AI machine learning device
  • 5 to 8 show examples of how to switch between the main yarn and the plating yarn in inverse plating.
  • the cam 28 of the carriage 16 operates the needles 23A to 23C, etc., and switches the main yarn and the plating yarn from the stitch formed by the needle 23C, for example.
  • a sinker 24 is arranged between the needles 23, the carriage 16 is in the right row in this example, and 25 and 26 are self-propelled carriers, which supply the knitting yarns 21 and 22 to the needles 23A to 23C, respectively.
  • the knitting yarn 21 is the main yarn up to the needle 23B, the plating yarn from the needle 23C, and the knitting yarn 22 is the plating yarn up to the needle 23B, and the main yarn from the needle 23C.
  • the carrier that supplies the main yarn leads, and the carrier that supplies the plating yarn follows.
  • the one with the smaller yarn feeding angle from the horizontal plane becomes the main yarn
  • the one with the larger yarn feeding angle becomes the plating yarn.
  • the yarn feed angles are indicated as ⁇ and ⁇ .
  • P1 and P2 are the positions of the free-running carriers 25 and 26 with respect to the carriage 16
  • L1 and L2 are the distances between the carriage 16 and the free-running carriers 25 and 26, respectively.
  • the carriers 25 and 26 are switched between leading and trailing, and the switching position is determined based on the needle 23C that performs the switching. For example, it is assumed that the carrier 25 and the carrier 26 intersect at the intersecting position CP with the needle 23C as a reference. Then, the preceding self-propelled carrier 25 is decelerated and the following self-propelled carrier 26 is accelerated so that the carriers 25 and 26 intersect at the crossing position CP. When the relative position with respect to the carriage 16 is switched, the carriers 25 and 26 are accelerated and decelerated so as to move at a constant speed. A deceleration start position and an acceleration start position for switching the positions of the free-running carriers 25 and 26 are used as correction data.
  • FIG. 6 the switching in FIG. 5 is improved, and the carriers 25 and 26 are reversed as indicated by the white arrows in the coordinate system with the carriage 16 as the reference.
  • P1' and P2' in FIG. 6 are reversed positions of the carriers 26 and 25.
  • FIG. 6 When the positions of the carriers 25 and 26 are exchanged, the knitting yarns 21 and 22 may become entangled, and if the position where the knitting yarns are entangled is ahead of the needle 23C in the carriage advancing direction, the knitting yarns are not properly switched. However, when the reversal operation is performed, the position where the knitting yarns 21 and 22 are entwined is limited to the rear of the needle 23C in the carriage advancing direction. As a result, the switching between the main yarn and the plating yarn can be controlled more accurately, and the knitted fabric can be prevented from appearing blurred due to variations in switching positions. Note that the distance for reversal operation may be added to the target of correction data.
  • Inverse plating can also be achieved by switching the heights P1 and P2 of the pair of carriers 31 and 32. Two examples are shown in FIGS.
  • the angles ⁇ and ⁇ formed by the direction of feeding the yarn to the needle from the horizontal plane determine the assignment of the main yarn and the plating yarn, and the yarn with the smaller angle becomes the main yarn. Therefore, the pair of carriers 31 and 32 are taken by the carriage 16 or made to run by themselves.
  • inverse plating can be performed.
  • the knitting yarn 21 from the carrier 31 is the first main yarn and the knitting yarn 22 from the carrier 32 is the plating yarn. Then, the yarn feeders of the carriers 31 and 32 are crossed in the height direction at the crossing position CP. H1 is the carriage reference height for supplying the main yarn, and H2 is the carriage reference height for supplying the coating yarn.
  • FIG. 8 the switching of FIG. 7 is improved so that the yarn feeder of the carrier 31 is raised to position P2'' and then reversed and lowered. Also, after the yarn feeder of the carrier 32 is lowered to the position P1'', it is reversed and raised.
  • a knitted fabric with less blurring can be knitted as compared with the knitted fabric of FIG.
  • any method of inverse plating may be used as long as it requires correction data according to the knitting conditions for switching between the main yarn and the plating yarn.
  • the feed angle to the needles may be switched by rotating the carrier about its vertical axis.
  • the magnitude of the tension applied to the knitting yarn may be switched.
  • the correction data in this case is, for example, the tension switching timing.
  • a movable sinker may be used to switch between the main yarn and the coating yarn.
  • the objective variable indicates at which position the switching operation of the carrier is to be started in terms of the pitch of the needle in front of the knitting direction with respect to the needle to be switched. The reason why the objective variable has a decimal point is to start the switching more precisely than the pitch of one needle.
  • the acceleration/deceleration pattern itself may be added to the objective variable in addition to the acceleration/deceleration start position for switching.
  • the knitting speed is 0.8 m/s
  • the 8th carrier is moved from the leading to the trailing.
  • the expected value of SVR8 is to start the switching operation 17.3 needles ahead of the target needle.
  • the expected value is to start the switching operation 15.9 needles ahead of the target needle.
  • the starting position of the switching operation differs between the paired carriers.
  • FIG. 11 shows a knitted fabric subjected to inverse plating with the correction data of FIGS. 9 and 10.
  • the knitting is circular knitting, "1" in the figure is the position where the correction data of FIG. 9 is processed, and "2" in the figure is the position where the correction data of FIG. 10 is processed.
  • the target position for switching is not the sinker loop but the needle loop.
  • the knitting is performed using the correction data as predicted by the SVR 8, but fine adjustment of the correction data enables more accurate control of the switching position between the main yarn and the cover yarn.
  • a knitted fabric with less bleeding is obtained. In this way, it is possible to replace jacquard and intarsia by inverse plating with relatively little preparation work.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Knitting Of Fabric (AREA)
PCT/JP2021/048124 2021-01-22 2021-12-24 インバースプレーティング用補正データの生成方法、及び生成システム Ceased WO2022158251A1 (ja)

Priority Applications (4)

Application Number Priority Date Filing Date Title
KR1020237028066A KR20230132830A (ko) 2021-01-22 2021-12-24 인버스 플레이팅용 보정 데이터의 생성방법 및 생성시스템
CN202180091336.1A CN116745477A (zh) 2021-01-22 2021-12-24 反转添纱用修正数据的生成方法及生成系统
JP2022577064A JPWO2022158251A1 (enrdf_load_stackoverflow) 2021-01-22 2021-12-24
EP21921352.7A EP4283031A4 (en) 2021-01-22 2021-12-24 MANUFACTURING PROCESS AND MANUFACTURING SYSTEM FOR CORRECTION DATA FOR INVERSE PLATING

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JP2021-008627 2021-01-22
JP2021008627 2021-01-22

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WO2022158251A1 true WO2022158251A1 (ja) 2022-07-28

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EP (1) EP4283031A4 (enrdf_load_stackoverflow)
JP (1) JPWO2022158251A1 (enrdf_load_stackoverflow)
KR (1) KR20230132830A (enrdf_load_stackoverflow)
CN (1) CN116745477A (enrdf_load_stackoverflow)
WO (1) WO2022158251A1 (enrdf_load_stackoverflow)

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EP4474558A1 (en) 2023-06-07 2024-12-11 Canmartex Catgrup, S.L. Method for adjusting an automatic knitting machine for plating knitting, and corresponding system

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Cited By (2)

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Publication number Priority date Publication date Assignee Title
EP4474558A1 (en) 2023-06-07 2024-12-11 Canmartex Catgrup, S.L. Method for adjusting an automatic knitting machine for plating knitting, and corresponding system
WO2024251776A1 (en) 2023-06-07 2024-12-12 Canmartex Catgrup, S.L. Method for adjusting an automatic knitting machine for plating knitting, and corresponding system

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EP4283031A1 (en) 2023-11-29
CN116745477A (zh) 2023-09-12
JPWO2022158251A1 (enrdf_load_stackoverflow) 2022-07-28
EP4283031A4 (en) 2024-07-10
KR20230132830A (ko) 2023-09-18

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