EP2280104B1 - Device and program for loop length routine setting in a flatbed knitting machine - Google Patents

Device and program for loop length routine setting in a flatbed knitting machine Download PDF

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Publication number
EP2280104B1
EP2280104B1 EP09738725.2A EP09738725A EP2280104B1 EP 2280104 B1 EP2280104 B1 EP 2280104B1 EP 09738725 A EP09738725 A EP 09738725A EP 2280104 B1 EP2280104 B1 EP 2280104B1
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Prior art keywords
stitch
knitting
area
routine
loop
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EP09738725.2A
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German (de)
English (en)
French (fr)
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EP2280104A1 (en
EP2280104A4 (en
Inventor
Yoshiyuki Komura
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Shima Seiki Mfg Ltd
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Shima Seiki Mfg Ltd
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    • 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
    • D04B15/32—Cam systems or assemblies for operating knitting instruments
    • D04B15/36—Cam systems or assemblies for operating knitting instruments for flat-bed knitting machines
    • 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
    • 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
    • D04B7/04—Flat-bed knitting machines with independently-movable needles with two sets of needles
    • D04B7/045—Flat-bed knitting machines with independently-movable needles with two sets of needles with stitch-length regulation

Definitions

  • the present invention relates to setting of a loop length routine that is executed before knitting of a knitted fabric in a flatbed knitting machine, as known from EP 1 605 084 and according to the preambles of claims 1 and 4.
  • a knitting cam system in a flatbed knitting machine is provided with stitch cams that can be adjusted by way of a motor or the like.
  • the cams control the pull-down extent by which needles, having yarn hooked thereon, are pulled down.
  • the cams are used for adjusting stitch size, since the latter is determined by the pull-down extent.
  • Stitch size can be expressed by the length of yarn per pitch (hereafter, loop length).
  • the loop length is designated by, for instance, knitting data. Knitting thus a knitted fabric according to a designated loop length allows improving the quality of the knitted fabric, in particular the texture of the knitted fabric, and allows preventing fluctuation in the size of the knitted fabric and fluctuation in the amount of yarn that is required.
  • Patent Document 1 Japanese Patent No. 2952391
  • Patent Document 2 Japanese Patent No. 3554088
  • Patent Document 3 Japanese Patent No. 3603031
  • digital stitch control stitch control
  • stitch cams To implement digital stitch control, stitch cams must be adjusted, prior to the actual knitting of the knitted fabric, so that the knitted fabric may be knitted at the designated loop length. This adjustment is called a loop length routine, the execution whereof requires cumbersome setting.
  • the inventors arrived at the present invention as a result of studies on automation of loop routine setting.
  • a method and a device for controlling length of yarn of weft knitting machine is known, in order to control the yarn length as appropriate in a tubular knitted fabric including a drop loop, regardless of the presence of crossover.
  • a hung stitch is formed by hanging yarn over knitting needles that are adjacent to the knitting needles performing the knitting which are on the front needle bed for the front knitted fabric or on the back needle bed for the back knitted fabric which are under a condition of retaining no knitting stitch loop, and the hung stitch is shook off, and a knitting stitch loop formed on the knitting needles which have performed knitting is taken as a drop loop, and wherein a length of yarn used for knitting the drop loop is controlled to be a predetermined constant yarn length in such a manner that the length of yarn is separated for a front knitted fabric and a back knitted fabric, and further separated based on whether knitting needles for knit knitting that are adjacent to each other having a hung stitch therebetween belong to
  • Document EP 0 723 042 A1 discloses yarn length control system for a flat knitting machine, in which where in a plurality of knitting locks work on a single needle bed to knit the consumption of each yarn is measured and compared with the standard yarn length, and the stitch cam adjustment values of the respective knitting locks are corrected.
  • the stitch cam adjustment data is stored for the respective combinations of stitch cams and yarns. Correction is not limited to the stitch cam which knitted the yarn of which consumption was measured. Correction by the same value is also given to the stitch cam adjustment values of other stitch cams relative to the yarn. As a result, for any combination of a stitch cam and a yarn which appears suddenly in the latter half of knitting, the stitch cam adjustment values have been corrected on the basis of the measurement of consumed yarn lengths of other stitch cams, generating no knitting gaps.
  • a representative yarn is selected from multiple yarns to be used.
  • a loop length routine is done for the representative yarn, and the stitch cams are adjusted.
  • actual stitch cam values are determined by adding said adjustment values to the values of stitch cams obtained from the knitting data, and the standard garment is knitted.
  • a subsequent garment is knitted, and the yarn length consumed is compared with the yarn length consumed by the standard garment to update stitch cam adjustment values.
  • An object of the present invention is to facilitate loop routine setting, in order to execute stitch control. This and other objects are solved by a device for loop routine setting having the features as set forth in claim 1. Preferred embodiments of the device are stated in the subclaims.
  • the present invention is a device for loop routine setting according to claim 1.
  • the present invention is a program for loop routine setting according to claim 4.
  • the features relating to the device for loop routine setting apply also to the setting program. Conversely, the features relating to the setting program apply also to the setting device.
  • the carriage comprises a plurality of cam systems.
  • loop routine setting there is set a loop length routine scheme and a stitch target size in a loop length routine, in combination units of carriers and cam systems.
  • a single loop length routine is executed for both the first area and the second area, with the first carrier, the first stitch target size and the first knitting structure, and also in use of only one from among the first and the second cam systems; and the adjustment data, acquired in the loop length routine, is utilized for both the first cam system in the first area and the second cam system in the second area.
  • control schemes there are preferably set, as control schemes, at least a first scheme in which a yarn consumption amount is compared with a yarn amount calculated on the basis of a stitch size in the knitting data, and a result thereof is fed back to a stitch cam, and a second scheme in which the yarn consumption amount is compared with a yarn consumption amount in a sample knitted fabric, and a result thereof is fed back to the stitch cam;
  • the first scheme is preferentially allocated to an area of large knitting width and of plain or ribbed knitting structure
  • the second scheme is preferentially allocated to an area of narrow knitting width and of jacquard knitting structure.
  • the user is freed thereby from stitch control scheme setting and loop routine setting. Accordingly, it becomes easier for the user to knit a stable, uniform knitted fabric through feedback of the yarn consumption amount to the stitch cams.
  • the loop length routine scheme and the stitch target size in a loop length routine are set in combination units of carriers and cam systems, whereupon the loop length routine is executed for each combination of yarn and cam system.
  • stitch cams can be adjusted accurately before knitting of the actual knitted fabric.
  • first area of knitting with a first carrier, a first cam system, a first stitch target size and a first knitting structure, and a second area of knitting with the first carrier, a second cam system, the first stitch target size and the first knitting structure.
  • a single loop length routine for both the first area and the second area, with the first carrier, the first stitch target size and the first knitting structure, and only one from among the first and the second cam systems; and the adjustment data, acquired in the loop length routine, is used for both the first cam system in the first area and the second cam system in the second area.
  • the number of loop length routines can be reduced that way. In this case, moreover, the carriers and stitch target sizes are the same, and the stitch cams can be adjusted accurately even with fewer loop length routines.
  • control schemes there are set, as control schemes, at least a first scheme in which a yarn consumption amount is compared with a yarn amount calculated on the basis of stitch size in the knitting data, and is fed back to a stitch cam, and a second scheme in which the yarn consumption amount is compared with a yarn consumption amount in a sample knitted fabric, and is fed back to the stitch cam.
  • the first scheme is preferentially allocated to an area of large knitting width and of plain or ribbed knitting structure.
  • the second scheme is preferentially allocated to an area of narrow knitting width and of jacquard knitting structure.
  • the first scheme that involves knitting at a designated stitch size in areas where stitches can be knitted easily according to the target stitch size
  • the second scheme that involves knitting with the same yarn consumption amount as that of a sample, in areas where knitting according to the target size is difficult, so that stitch cams can be controlled according to schemes correspond to the areas.
  • the reference numeral 2 denotes a design system and 4 a flatbed knitting machine.
  • the design system 2 and the flatbed knitting machine 4 are connected by way of an LAN 6.
  • a storage medium such as a CD-ROM or the like may also be used to connect the design system 2 and the flatbed knitting machine 4.
  • the design system 2 comprises a bus 8, and input/output units such as a color monitor 9, a keyboard 10, a color printer 11, a mouse 12 or the like.
  • Other than the mouse 12 there may also be provided a manual input unit such as a trackball, a joystick or a stylus.
  • the reference numeral 15 denotes a 3D graphic system that simulates three-dimensionally the state of knitted fabric that is knitted in accordance with knitting data. For instance, yarn layout is simulated in three dimensions on the basis of the knitting data.
  • the reference numeral 16 denotes a file memory in which there are stored various files and knitting data, as well as setting programs of, for instance, a loop length routine. In the explanation below, the design system 2 operates in accordance with a program stored in the file memory 16, but the design system 2 is not limited thereto.
  • the reference numeral 17 denotes an image memory in which there are stored, for instance, images that correspond to simulation data and knitting data.
  • the reference numeral 20 denotes a knit design unit that designs a knitted fabric and/or a garment in accordance with inputs from the keyboard 10, the mouse 12 or the like. In the present description, the knitted fabric includes also a garment.
  • the reference numeral 21 denotes a data conversion that converts design data obtained from the knit design unit 20 to knitting data that can be executed in the flatbed knitting machine 4.
  • the knitting data includes data on what operation is to be performed by the needles of a needle bed, and from what carrier yarn is to be supplied, during the travel of a carriage over needle beds 41 of the flatbed knitting machine 4. In the knitting data there is designated, for each area, a target loop length for the stitches or a loop number corresponding to a target loop length. The type of each stitch is also learned from the knitting data.
  • a knitting data analyzer 22 analyzes the knitting data according to a knitting data analysis instruction 51, and acquires, for instance, the knitting width stitch target size, the number of the cam system that is used, and the stitch type, for each area.
  • a stitch control system settings 23 decides which feedback control scheme to use for the carriage stitch cam, on the basis of the results of the analysis of knitting data. This scheme is carried out for area units, specifically for combinations units of cam systems and carriers in the area.
  • a loop routine setting 24 performs setting relating to loop length routine, and decides which loop length routine scheme to perform, to what stitch target size and what knitting width, using a combination of which cam system and which carrier.
  • An LAN interface 30 sends knitting data, together with, for instance, control data and setting data for a loop length routine, to a controller 46 of the flatbed knitting machine 4.
  • a disc drive 31 outputs these data to a disc, thereby allowing the data to be read by a disc drive, not shown, of the controller 46.
  • the flatbed knitting machine 4 comprises at least a pair of front and rear needle beds 41.
  • a carriage 42 moves back and forth along the top of the needle beds 41.
  • the carriage 42 comprises, for instance, two cam systems S1, S2.
  • the cam systems S1, S2 knit a knitted fabric by operating the needles of the needle beds 41.
  • the number of cam systems ranges from one to, for instance, four.
  • the cam systems S1, S2 comprise respective stitch cams that can be adjusted by way of a motor.
  • the stitch cams pull the needles down towards the needle bed, after the yarn is hooked by the needles.
  • Stitch size i.e. the yarn length per stitch, can be controlled by adjusting the extent of needle pull-down by the stitch cams.
  • the carriage 42 carries the plurality of carriers 43 along, and supplies yarn from the carriers 43 to the needles.
  • the yarn is supplied from cones 45 by way of an encoder 44.
  • the length of yarn paid out is measured by the encoder 44.
  • the type of the encoder 44 is arbitrary. Also, there may be added a device for pulling back the yarn paid out from the encoder 44.
  • the reference numeral 46 denotes the above controller that works out the yarn consumption amount on the basis of signals from the encoder 44, and that controls the carriage 42 to cause thereby the needle beds 41 to move back and forth and to carry the designated carriers 43 along.
  • the stitch cams of the cam systems S1, S2 are adjusted, to bring the stitch size closer to a target value, on the basis of the yarn consumption amount from the encoder 44.
  • Fig. 2 and Fig. 3 illustrate stitch cam setting and a stitch control data setting program 50.
  • Knitting data is analyzed by the knitting data analyzer 22, according to a knitting data analysis instruction 51, to elucidate as a result the knitting structure and the knitting width of each area.
  • a stitch control scheme is allocated according to a stitch control scheme allocation instruction 52.
  • a "control" scheme is used in knitting areas of large knitting width, for rib structures and plain structures. In this scheme there is compared a yarn consumption amount and a target loop size in the knitting data, for one to a plurality of course units. To avoid confusion with other control schemes, this scheme is also referred to hereafter as "course unit control" scheme.
  • a “sampling/comparison” scheme is used when the knitting width is medium. No feedback control of the stitch cams is carried out when the knitting width is small. In jacquard structures, stitch cams are not controlled when the knitting width is small, but are controlled in accordance with a “sampling/comparison” scheme when the knitting width is medium to large.
  • the above rules are stored in a rule table 26, but may be stored in a database or the like, instead of a table.
  • a large knitting width denotes, for instance, 25 cm or more
  • a medium knitting width denotes 12.5 to 25 cm
  • a small knitting width denotes a width smaller than 12.5 cm.
  • the yarn consumption amount calculated on the basis of the stitch size designated by the knitting data i.e. the loop length per stitch
  • the yarn consumption amount calculated on the basis of the loop length per stitch is a kind of theoretical value relating to the yarn consumption amount.
  • Examples of feedback units include, for instance, three kinds of units, namely feedback for each course, feedback for each back-and-forth travel of the carriage, i.e. for every two courses, or feedback in which the yarn consumption amount is integrated over three or more courses. The above types are selected depending on the size of the knitting width.
  • the "sampling/comparison" scheme feedback control is performed on the stitch cams in such a manner so as to achieve a yarn consumption amount identical to that of a knitted fabric sample.
  • the frequency of feedback control for instance it terms of yarn consumption amount, ranges for instance from 1 to 30 m. If there is knitted at least a sample of an area that utilizes a sampling/comparison scheme in a sample that has a satisfactory texture, then the shape of the sample may be different from that of the knitted fabric that is actually knitted.
  • the above applies also to the case of a control scheme in course units. In case of complex structures such as jacquard or the like, it is difficult to accurately specify the yarn consumption amount on the basis of knitting data.
  • stitch cams are controlled in such a way so as achieve a yarn consumption amount identical to that of a sample that is taken as a reference.
  • feedback control of the stitch cams is no longer carried out in case of narrow knitting width or in cases were multiple-color jacquard is used.
  • the initial adjustment of the stitch cams is performed in the loop length routine, even if no feedback control is carried out.
  • a narrow area is merged into a large area.
  • the "course unit control" scheme and the “sampling/comparison” scheme are used for a combination of a carrier C1 and a cam system S 1.
  • the area of the "sampling/comparison” scheme is narrower than the area of the "course unit control” scheme
  • the entire area of the combination of the carrier C1 and the cam system S1 is processed in accordance with the "course unit control" scheme.
  • a narrow-area control scheme is matched with a large-area control scheme.
  • the user can edit stitch control setting data, via the keyboard 10, the mouse 12 or the like. For instance, a small area merged according to the merge instruction 53 may be more important to the user than a large area nearby. In this case, the user can unify the control scheme to, for instance, the "sampling/comparison" scheme, which is appropriate for small areas.
  • Fig. 4 illustrates loop routine setting
  • Fig. 5 illustrates a loop routine setting program 60.
  • the loop length routine a loop target size is designated for each combination of carrier and cam system, and there is decided which loop length routine is executed. There is also decided the knitting width of the knitted fabric that is knitted in accordance with the loop length routine.
  • the loop routine settings 24 acquires a stitch control scheme from the stitch control system settings 23. The stitch control scheme designates the scheme according to which the stitches are controlled in each combination of carrier and cam system.
  • This instruction is a knitting structure/loop length acquisition instruction 62.
  • the conditions of the loop length routine for each area are temporarily set in a loop length routine temporary setting instruction 63.
  • a loop length routine scheme is decided for each area.
  • a loop length routine 1 (scheme 1) is used for plain knitting.
  • the length resulting from adding the loop length for each stitch is taken as the target consumed yarn length in the loop length routine.
  • a loop length routine 2 (scheme 2) is used as the loop length routine scheme for rib structures.
  • the result of adding the prolongation length to the loop length of each stitch is taken as the target value of consumed yarn length in the loop length routine.
  • the result of adding loop target sizes is used also in a scheme 3 suitable for jacquard and the like.
  • the loop target size includes prolongation portions.
  • the adjustment values of the stitch cams are not shared, even if the cam system and the carrier are the same, but are further adjusted in accordance with the difference between target loop lengths.
  • the cam system and the carrier are the same in the loop length routine 3 (scheme 3)
  • the adjustment values of the stitch cams are shared, even if the target loop lengths are dissimilar.
  • a loop target size (consumed yarn length) is designated for each area in a loop length routine.
  • the knitting width of the area is set as the knitting width in the loop length routine.
  • the merge instruction 64 there are merged routines for which the same carrier and cam system are used and for which the routine scheme is the same. For instance, a loop size is designated for a main area, and a loop length routine is executed, in a case where the loop length target sizes are dissimilar from among routines for which the combination of carrier and cam system is the same but the loop length routine schemes are different.
  • the loop length routine is set by designating a loop length for an area that is knitted initially. For other areas, the stitch cams are adjusted in such a manner so as to add an adjustment value according to a difference in loop length.
  • the merge instruction 65 there are merged next routines for which the same carrier but a different system is used, and for which the routine scheme is the same and the loop target size is the same, to reduce the number of loop length routines.
  • User editing is performed in the user edit instruction 66. This concludes the setting of the loop length routine. If the knitting width is different in the merge instructions 64, 65 depending on the area, there is used, for instance, the larger knitting width, or alternatively, the knitting width corresponding to the area that is knitted first.
  • Fig. 6 and Fig. 7 illustrate examples of stitch control scheme setting and of loop routine setting.
  • the reference numeral 71 denotes a hem knit portion comprising a rib structure
  • 72 denotes a main body
  • 73, 74 denote two shoulder portions, left and right.
  • the knitting width of the hem knit portion 71 is large enough, and hence the stitch control scheme is a "course unit control” scheme.
  • the structure is ribbed, and hence the loop length routine scheme is 2.
  • the stitch control scheme is a "course unit control” scheme
  • the loop length routine scheme is 1.
  • the stitch control scheme is a "sampling/comparison” scheme or, alternatively, the stitch control is turned off.
  • the loop length routine may be omitted even if, for instance, the loop length routine 3 is executed.
  • the loop length routine 3 there is executed the loop length routine 3.
  • the stitch control scheme, the loop length routine scheme and so forth can be automatically set on the basis of knitting data, as described above.
  • the reference numeral 81 denotes a hem knit portion.
  • Areas 82 to 85 which make up a main body, use two types of yarn. Therefore, the carriers C1, C2 and cam systems S1, S2 are selectively assigned to the areas.
  • Area 82 and area 85 have the same carrier but a different cam system.
  • the knitting structure is plain in both cases, and the corresponding loop length routine is scheme 1.
  • the target loop size is the same.
  • Area 83 and area 84 have the same carrier but a different cam system.
  • the knitting structure is plain in both cases, and the corresponding loop length routine is scheme 1.
  • the target loop size is the same.
  • the loop length routines can be merged provided that, for instance, the knitting structure is the same (same type of loop length routine) and the target loop size is shared, for areas having the same carrier but a different cam system.
  • the result of the loop length routine for area 82 is copied to the cam system S2 upon start of knitting in area 85.
  • the execution result of the loop length routine for area 83 is copied to the cam system S1 upon start of knitting in area 84.
  • correction values of stitch cams at a time halfway during knitting of the actual knitted fabric may be copied for the areas in which loop length routines are merged.
  • the reference numerals 86, 87 denote the area of both shoulders. The process for the area is the same as that of the two shoulder portions 73, 74, in Fig. 6 .
  • the loop length routine result can be copied to another stitch cam, and the number of loop length routines can be reduced also in case that stitch target sizes are different or the knitting structures are different.
  • the adjustment value of the stitch cam may be corrected in proportion and then copied.
  • the adjustment value of the stitch cam may be corrected in proportion and then copied.
  • the present embodiment elicits the following effects.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
EP09738725.2A 2008-05-02 2009-04-21 Device and program for loop length routine setting in a flatbed knitting machine Active EP2280104B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008120368 2008-05-02
PCT/JP2009/057889 WO2009133788A1 (ja) 2008-05-02 2009-04-21 横編機でのループ長ルーチンの設定装置と設定プログラム

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EP2280104A1 EP2280104A1 (en) 2011-02-02
EP2280104A4 EP2280104A4 (en) 2012-12-19
EP2280104B1 true EP2280104B1 (en) 2016-05-25

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JP (1) JP5414668B2 (zh)
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WO (1) WO2009133788A1 (zh)

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JP6108882B2 (ja) 2013-03-05 2017-04-05 株式会社島精機製作所 横編機と横編機での編成方法
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GB2559567B (en) 2017-02-08 2022-06-22 Unmade Ltd A method of knitting a fabric using a knitting machine and a knitting machine
CN110607603B (zh) * 2019-07-15 2021-02-02 东莞市纮萦服饰有限公司 一种横机密度的自适应调整方法
CN111078964B (zh) * 2019-12-09 2023-03-31 广东溢达纺织有限公司 刻度盘调机度数显示方法、装置、计算机设备和存储介质
CN114775154B (zh) * 2022-04-12 2022-10-18 浙江恒强科技股份有限公司 一种全成型织物区域拉力动态控制系统及方法

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CN102016147B (zh) 2012-07-18
JP5414668B2 (ja) 2014-02-12
JPWO2009133788A1 (ja) 2011-09-01
WO2009133788A1 (ja) 2009-11-05
EP2280104A1 (en) 2011-02-02
EP2280104A4 (en) 2012-12-19
CN102016147A (zh) 2011-04-13

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