EP2985372B1 - A process for regulating the size of knitted articles under production in circular knitting machines for knitwear or hosiery - Google Patents

A process for regulating the size of knitted articles under production in circular knitting machines for knitwear or hosiery Download PDF

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Publication number
EP2985372B1
EP2985372B1 EP15179905.3A EP15179905A EP2985372B1 EP 2985372 B1 EP2985372 B1 EP 2985372B1 EP 15179905 A EP15179905 A EP 15179905A EP 2985372 B1 EP2985372 B1 EP 2985372B1
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EP
European Patent Office
Prior art keywords
yarn
knitted
knitting machine
consumption
zone
Prior art date
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Application number
EP15179905.3A
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German (de)
English (en)
French (fr)
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EP2985372A1 (en
Inventor
Tiberio Lonati
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Santoni SpA
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Santoni SpA
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Priority to PL15179905T priority Critical patent/PL2985372T3/pl
Publication of EP2985372A1 publication Critical patent/EP2985372A1/en
Application granted granted Critical
Publication of EP2985372B1 publication Critical patent/EP2985372B1/en
Priority to HRP20191819TT priority patent/HRP20191819T1/hr
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Classifications

    • 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
    • D04B1/22—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 specially adapted for knitting goods of particular configuration
    • D04B1/24—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 specially adapted for knitting goods of particular configuration wearing apparel
    • 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
    • D04B35/10—Indicating, warning, or safety devices, e.g. stop motions
    • D04B35/12—Indicating, warning, or safety devices, e.g. stop motions responsive to thread consumption
    • 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
    • D04B1/22—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 specially adapted for knitting goods of particular configuration
    • D04B1/24—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 specially adapted for knitting goods of particular configuration wearing apparel
    • D04B1/246—Upper torso garments, e.g. sweaters, shirts, leotards
    • 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
    • D04B1/22—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 specially adapted for knitting goods of particular configuration
    • D04B1/24—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 specially adapted for knitting goods of particular configuration wearing apparel
    • D04B1/26—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 specially adapted for knitting goods of particular configuration wearing apparel stockings
    • 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
    • D04B15/38—Devices for supplying, feeding, or guiding threads to needles
    • D04B15/48—Thread-feeding devices
    • D04B15/488—Thread-feeding devices in co-operation with stitch-length-regulating mechanism
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B9/00—Circular knitting machines with independently-movable needles
    • D04B9/02—Circular knitting machines with independently-movable needles with one set of needles
    • D04B9/025—Circular knitting machines with independently-movable needles with one set of needles with stitch-length regulation
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B9/00—Circular knitting machines with independently-movable needles
    • D04B9/42—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration
    • D04B9/44—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration elongated tubular articles of small diameter, e.g. coverings for cables
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B9/00—Circular knitting machines with independently-movable needles
    • D04B9/42—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration
    • D04B9/46—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration stockings, or portions thereof

Definitions

  • the present invention relates to a process for regulating the size of knitted articles under production on circular knitting machines for knitwear or hosiery.
  • the invention further relates to a process for regulating and balancing the stitches of the knitted fabric produced by circular knitting machines for knitwear or hosiery (i.e. for regulating and balancing the size of the stitches of the textile or the knitted article produced at the various yarn feeding positions, or drop points, of the machine).
  • the invention further relates to a circular knitting machine for knitwear or hosiery configured to actuate the method.
  • Modern circular knitting machines for knitwear or hosiery exhibit a high level of automation and operate together with specific knitting programs, enabling automatic production of numerous types of knitted articles, among which hosiers products, knitwear production of the seamless type, etc.
  • the manufacturing of these products is influenced by numerous factors, such as the configuration of the knitting machine, the type of components mounted on the knitting machine, the type of yarn used, the state of wear of the various components, the environmental conditions, and more besides. It is therefore important to control the quality of the fabric of the knitwear products, by detecting the appropriate parameters, avoiding the formation of defects in the articles themselves which might lead to loss in quality and production rejects.
  • Sensors are included for measuring the position of the movable support members along the vertical path of movement, detecting the rotational speed of the needle cylinder, and measuring a feeding characteristic of the yarn such as yarn feed tension or quantity.
  • a controller is operatively connected to the drive motors and sensors for comparing each of the sensed values with a predetermined knitting machine operating standard and actuating the drive motors for adjusting the stitch cams as needed.
  • some known solutions exhibit a certain degree of imprecision in the detecting of some operating parameters of the machine, for example in the detecting of the quantities of yarn consumed, which are often estimated on the basis of the number of rotations of a rotating organ, such as a reel or a rotating wheel, on which the yarn is wound once or more (in one or two winding spires) in a yarn feeder, with consequent possible imprecisions due to slippage between the yarn and the rotating organ or spool.
  • a rotating organ such as a reel or a rotating wheel
  • These rotary spool yarn feeders are suitable only for working some limited types of yarn, such as for example elastic yarn (such as spandex or elastane ) or non-clad yarn ( bare spandex or bare elastane ).
  • the rotary spool devices are suitable for feeding these types of yarn, but do not enable reliable detection of the yarn consumed by the various yarn feeding positions of the machine precisely because they are subject to slippage during the step of speed change due to the various knitting operations internally of a same manufactured product.
  • the rotary spool devices are not suitable for feeding non-elastic yarns, such as natural fibres, artificial fibres and non-textured synthetic yarns, precisely because of the slippage due to the very rapid acceleration phases necessary for maintaining the programmed tension of the yarn feed.
  • a further drawback of the known solutions is that they often include a contextual regulating of various reciprocally-connected parameters, with a system that is complex and at times not sufficiently reliable in the results thereof.
  • a further drawback of the known solutions is that they enable regulating the stitches of the textile produced only partially automatically, as supervision and intervention on the part of the specialised operators are frequently necessary in order for delicate regulating operations of the operating parameters.
  • a further drawback of the known solutions is that they require periodical performing of preliminary operations of regulation of the machine, by the carrying out of special specific regulating and balancing operations in which a sample knitted article is realised having a uniform stitch structure, and do not enable an effective control and regulation of the functioning of the machine during the production of the articles, and therefore do not enable efficient detection of the variations in production due to the environmental conditions or other parameters.
  • the known technical solutions are often complex and expensive, as they require the mounting on the machine of numerous additional components for enabling the carrying out of the control and regulation procedures. It is also important to stress that the known solutions do not enable efficient management of the production on a plurality of knitting machines present in a production centre, and that therefore each machine has to be set manually by the operators and regulated in a substantially autonomous way. Further, with the known solutions it is generally not possible to automatically guarantee, and with sufficient precision, the uniformity of the stitches of the knitted articles realised during production.
  • the aim of the invention is to obviate one or more of the above-cited drawbacks.
  • An aim of the invention is to provide a process which enables producing knitted articles of high quality and substantially without imperfections, and/or which enables reducing production waste.
  • a further aim of the invention is to make available a process offering a control and regulation which are effective and efficient during the production of knitted articles.
  • a further aim of the invention is to provide a process which enables regulating the fabric of knitted articles as automatically as possible, reducing operator interventions to a minimum.
  • a further aim of the invention is to provide a process which enables obtaining highly dimensionally uniform production among the various articles produced, at different moments in time or under different operation conditions on a same machine and/or on a plurality of machines.
  • a further aim of the invention is to provide a process which enables guaranteeing a precise and reliable control and regulation of the sizes of the knitted articles produced on one or even a plurality of knitting machines at a same time.
  • a further aim of the invention is to provide a process which enables realising productions of knitted articles on a plurality of circular knitting machines, also having different technical characteristics, simply, rapidly and as automatically as possible.
  • a further aim of the invention is to make available a process which is user friendly, thus facilitating the work of the operators who are controlling knitting production, especially in a case in which there is a plurality of machines carrying out the production.
  • a further aim of the invention is to make available a process which enables reducing the number of persons required for controlling production, especially in plants where numerous knitting machines are present, thus enabling a reduced number of operators to control even a large number of knitting machines.
  • a further aim of the invention is to provide a process and a knitting machine that are configured to perform the process and which are simple, sturdy and relatively economical to realise.
  • a further aim of the invention is to disclose a process that guarantees high safety standards during functioning.
  • the invention further relates to a process wherein the steps of producing a portion of knitwear, detecting a plurality of yarn consumption data, comparing each yarn consumption datum, determining a correct value of the position of each stitch cam and individually displacing each stitch cam are cyclically carried out a plurality of times, preferably consecutively, up to when the result of the comparison is less than the predetermined tolerance threshold for all the functioning passive fixed-drum yarn feeders.
  • the invention further relates to a process comprising a step of emitting an alarm signal and/or halting the knitting machine in a case in which it is not possible to obtain a balancing of the fabric produced or an achieving of a correct size of the knitted article with a predetermined number of operating cycles.
  • the invention further relates to a process further comprising a step of memorising the corrective values corresponding to each knitted zone, and using the memorised corrective values to automatically displace the stitch cams before producing each corresponding knitted zone of a following corresponding knitted article on the same knitting machine or on a further knitting machine.
  • the invention further relates to a process in which the knitting machine further comprises a needle plate, operatively cooperating with the needle cylinder, for production of knitted material and/or of the knitted article, and relative additional stitch cams operatively active on the additional needles of the needle plate, the process further comprising the step of displacing the position of the additional stitch cams, similarly and contextually to what is carried out on the stitch cams of the needle cylinder, for maintaining the relation between the stitches produced by the cylinder and the stitches produced by the plate.
  • 1 denotes in its entirety a circular knitting machine for knitwear or hosiery, which comprises at least a bearing structure 2, a needle cylinder 3 rotatably mounted in the bearing structure 2 and a plurality of needles 4 supported by the needle cylinder 3 and mobile parallel to a rotation axis of the needle cylinder 3 for producing a knitted textile and/or a knitted article 6.
  • the term "circular knitting machine for knitwear or hosiery” is used for a circular knitting machine suitable for production of knitwear articles, seamless articles and/or hosiery, having a plurality of yarn feeding positions and relative stitch cams, or stitch triangles, which can be regulated automatically and individually, i.e. each cam independently of another in each predetermined knitted zone of a knitted product or article, and can be regulated also contextually, i.e. all the cams at the same time and in the same way.
  • These knitting machines can be, for example, of a single jersey or double jersey type (i.e. with a needle plate or a double cylinder).
  • circular knitting machine for knitwear or hosiery are those circular knitting machines dedicated to the production of textiles in metrage, i.e. for continuous production of textile.
  • Continuous or metrage machines do not allow for automatic independent regulating of the stitch cams, which are regulated manually at initial set-up of the machine for production, and are then regulatable only contextually and not independently of one another.
  • Continuous knitting machines are also provided with yarn feeders of the active (or positive) type, which all supply the same quantity of yarn at each yarn feeding position of the machine. These yarn feeders are generally activated to move directly by the rotation of the cylinder of the knitting machine with special movement means and supply all the yarn at the same speed, correlated to the rotation velocity of the cylinder.
  • the circular knitting machine 1 further comprises a plurality of stitch cams 7 operatively active on the needles 4, and in particular on relative heels 4a of the needles 4, and selectively mobile such as to vary the movement of the needles 4 and thus the size of the stitches 5a produced by the needles 4.
  • the cams 7 are regulatable in height in a known way, in the direction indicated by the arrow 14 in figure 4 .
  • the circular knitting machine 1 comprises a first plurality of fixed-drum passive (or negative or stationary) yarn feeders 8, each of which is operatively active to feed a yarn 9, unwinding from the fixed drum, to the needles 4, at a respective feed 10 position and at least a respective stitch cam 7.
  • Each yarn feeder 8 receives the yarn 9 from a respective reel 13 and supplies it to the needles 4 at a yarn feeding position 10.
  • the passive yarn feeder 8 and the fixed drum can be for example of the type illustrated in patent documents EP0707102 and EP1335054 in the name of LGL, the content of which at least in relation to the structure of the yarn feeder 8, the braking device for maintaining the tension of the yarn 9, and the measuring modes of the quantity of yarn used is incorporated for reference in the present text.
  • the expression "passive” is taken to mean that the yarn feeder operates in a way which is known as defile in the sector, i.e. in which the yarn unwinds from the yarn feeder following the request for yarn on the part of the knitting machine.
  • the expression “fixed drum” is taken to mean that the drum on which the yarn is wound is immobile during the unwinding of the yarn for supplying the knitting machine (while the drum itself can be activated in rotation to take the yarn from a respective reel).
  • the fixed-drum passive device enables carrying out the process of the invention optimally and without the slippage that happens with an innumerable number of types of yarns, for example natural yarns, artificial yarns, textured and parallel synthetic yarns and clad elastic yarns, while it is not suitable for feeding non-clad elastic yarns ( bare spandex, bare elastane ).
  • the circular knitting machine 1 can further comprise a second plurality of passive yarn feeders with a rotary spool (not illustrated as of known type) or other types, suitable in particular for feeding a clad or elastomer elastic yarn, which can be fed to the knitting machine together with the yarn 9 for realising a knitted article having both yarn 9 and elastomer or bare yarn.
  • the circular knitting machine 1 further comprises a control device 11 of the functioning of the knitting means 1 and electric and electronic means 12 connected to the control device 11 and operatively active such as to command the functioning of a plurality of parts of the knitting machine 1 and for detecting a plurality of operating parameters of the functioning of the knitting machine 1.
  • the knitting machine 1 can further comprise a needle plate (not illustrated in the figures as of known type), operatively cooperating with the needle cylinder 3, for the production of the knitted textile and/or the knitted article 6, and relative additional stitch cams operatively active on the additional needles of the needle plate.
  • a needle plate not illustrated in the figures as of known type
  • other yarn feed 8 types also suitable for the aim could be used.
  • passive yarn feeders could be used, of the rotary reel or other type in the first plurality of yarn feeders for carrying out a process of the invention, attaining only some of the aims of the invention and in a limited measure and very much less reliable.
  • the above-cited components, and the further conventional components of the knitting machine 1 are not described in greater detail in the present text as they are of known type.
  • a process for regulating the size of knitted articles under production on a circular knitting machine 1 for knitwear or hosiery comprises at least steps of defining (step A in figure 7 ) a knitted article to be produced on the knitting machine 1, subdividing (B) the article 6 to be produced, thus defining a plurality of knitted zones 6a, 6b each corresponding to a respective portion of knitted material, and activating (C) a production program of the knitted article 6 and thus of the knitted zones on the control device 11 of the knitting machine 1.
  • Figure 6 illustrates, for example, two knitted zones 6a, 6b, but it is possible to define any number of knitted zones such as to enable a progressively more-accurate control of the size of the knitted article in its various parts.
  • each knitted zone 6a, 6b can be associated to a respective desired measurement, expressed in a determined measurement unit, for example centimetres or inches.
  • a measurement can be made of the knitted articles produced, concerning each knitted zone or the knitted article.
  • the effective value of this measurement can be associated to the yarn consumption value detected for realising the corresponding knitted zone or knitted article, also such as to define a relation of correspondence between the measurement and the consumption of yarn.
  • the process for maintaining the size of the present invention also enables maintaining the measurement of the knitted article 6 and/or each knitted zone 6a, 6b substantially uniform to the set value.
  • the process further comprises the step of producing (D) the knitted zones of the knitted article 6 in sequence, maintaining substantially constant, by means of a braking device and/or a yarn tension regulation device (not illustrated as of known type), a yarn tension fed to the needles 4.
  • the braking and/or yarn tension regulating device is suitable for enabling automatic maintaining of the grammage of the programmed yarn tension during production.
  • the process further comprises the step of detecting (E) a plurality of yarn consumption data 9 per knitted zone 6a, 6b, detecting, among respective start knitting zones 6a, 6b and end knitting zones 6a, 6b, a total quantity of yarn 9 used for realising each knitted zone 6a, 6b at each yarn feeding position 10 of the machine and the relative fixed-drum passive yarn feeder 8 or for the totality of the fixed-drum passive yarn feeder 8 in function in production.
  • the process further comprises the step of comparing (F) the plurality of yarn consumption data 9 per knitted zone 6a, 6b with a respective plurality of yarn consumption reference values 9 per knitted zone 6a, 6b, such as to obtain a respective plurality of comparable results.
  • the process further comprises the step of determining (G) by means of a first algorithm a plurality of corrective values of the position of the stitch cams 7 on the basis of the respective plurality of comparable results, if those comparable results exceed respective predetermined tolerance thresholds or are out of respective predetermined tolerance intervals.
  • the first algorithm can for example comprise a calculation of a percentage displacement value, or another appropriate calculating formula.
  • the corrective values can be calculated by means of a definition of single unitary displacements of the cams 7 such as to enable a progressive reduction of the differences between the plurality of yarn consumption data 9 per knitted zone 6a, 6b and a respective plurality of yarn consumption reference values 9 per knitted zone 6a, 6b, by means of a cyclical repetition of the comparisons and corrections up to a progressive reaching of an objective condition in which all the comparable results fall within the predetermined tolerance intervals.
  • the corrective values can be calculated by defining a plurality of unit displacements of the cams 7 in order to reach the objective condition in a single comparing cycle or a small number of cycles.
  • the process further comprises the step of automatically displacing (H) the stitch cams 7 according to the plurality of corrective values, such as to reduce the difference between the plurality of yarn consumption data 9 per knitted zone 6a, 6b and the plurality of yarn consumption reference values 9 per knitted zone 6a, 6b, with the consequent maintaining of also the assigned measurement in each zone, in centimetres or inches.
  • the step of automatically displacing (H) the yarn regulating cams 7 can be carried out before producing a following zone of the same knitted article 6, such as to regulate the stitches produced in the successive zones on the basis of what is detected in the immediately preceding zone.
  • the step of automatically displacing (H) the stitch cams 7 can be done before producing each corresponding knitted zone 6a, 6b of a successive corresponding knitted article, such as to precisely regulate the production of each zone of a successive knitted article on the basis of what is detected in the corresponding zone of a preceding knitted article 6.
  • the displacement of the cams 7 is done before each knitted zone 6a, 6b on the basis of the corrective values detected with reference to the same or corresponding zone in a preceding knitted zone 6a, 6b of the same knitted article 6.
  • the process can further comprise a step of memorising (I) the corrective values corresponding to each knitted zone 6a, 6b, and comprises the use of the memorised corrective values for automatically displacing the stitch cams 7 before producing each corresponding knitted zone 6a, 6b of a successive corresponding knitted article.
  • the step of automatically displacing (H) the stitch cams 7 can be done immediately before producing a successive corresponding knitted article, such as to perform an overall correction starting from the following knitted article, for example on the basis of a mean of the corrections detected in the different zones of the preceding article.
  • the overall yarn consumption data 9 are compared with respective overall yarn consumption reference values per knitted zone 6a, 6b such as to obtain a respective plurality of comparable results and define a common corrective value for each knitted zone 6a, 6b.
  • the step of displacing the stitch cams 7 is performed by contemporaneously displacing all the stitch cams 7 active in production according to a same common corrective value and/or simultaneously.
  • the process can further comprise a preliminary regulating and balancing step (L) of the production of the circular knitting machine 1, illustrated in detail in figure 10 .
  • this preliminary regulating and balancing step of the production of the circular knitting machine 1 can also be carried out on a circular knitting machine 1 of the above-described type independently of the process for regulating the size of knitted articles under production as described herein above, thus in itself defining a process for regulating and balancing the fabric produced by a circular knitting machine for knitwear or hosiery.
  • the preliminary regulating and balancing step can be carried out before the production of the knitted articles, in order to balance the position of the stitch cams 7 in order to avoid defects or insufficient uniformity on the knitted products manufactured, and is carried out before the process steps for regulating the size of knitted articles under production as described as above. In this way the process for regulating the size of knitted articles can also enable maintaining the balance of the previously-obtained fabric.
  • the preliminary regulating and balancing step comprises the steps of defining (M) a sample portion of balancing knitted fabric 5 to be produced on the knitting machine 1, the portion of balancing knitted fabric 5 having a substantially uniform structure suitable for determining a same consumption of yarn 9 at each device of the first plurality of fixed-drum passive yarn feeders 8 functioning for the production.
  • FIG. 5 A detail of the portion of balancing knitted fabric 5 is illustrated for example in figure 5 , with horizontally-placed numerals from 1 to 5 indicating the various rows or columns (or sequences of vertical stitches, each produced by a respective needle) and vertically-placed numerals from 1 to 5 indicating the successive stitch rows of the textile (each produced by a yarn feed 10 at a determined rotation of the cylinder 3).
  • the preliminary regulating and balancing step further comprises the steps of producing (N) the portion of balancing knitted fabric 5 by means of a predetermined number of complete rotations of the needle cylinder 3, maintaining substantially constant a tension of the yarn 9 fed to the needles 4 by use of a braking and/or regulating device 9 and detecting, among respective start balancing knitted portion 5 signals and end balancing knitted portion signals, a plurality of yarn consumption 9 data used for realising the balancing knitted portion 5, detecting (O) a respective yarn consumption datum 10 at each yarn feeding position 10 of the machine and the relative fixed drum passive yarn feeder 8.
  • the preliminary regulating and balancing step further comprises the steps of comparing (P) each yarn consumption datum 9 relative to a respective yarn feeder 8, or a mean of each yarn consumption datum 9 on a single complete revolution of the needle cylinder 3, with a single common yarn consumption reference value, in order to obtain a respective comparable result, and determining (Q), by means of a second algorithm, a corrective value of the position of each stitch cam 7 on the basis of the respective comparison result of the corresponding yarn feeder 8 if the comparison result exceeds a predetermined tolerance threshold or is out of a predetermined tolerance range.
  • the second algorithm can comprise for example a calculation of a percentage displacement value, or another suitable calculation formula, for example the corrective value can correspond to a single step (minimum displacement value of the stitch cams 7) with a performing of various successive regulating cycles up to reaching the desired balance in a single cycle (and therefore up to when the comparable results are within the threshold of tolerance).
  • the corrective value can correspond to a plurality of steps for reaching the desired balancing in a single cycle or in a smaller number of cycles.
  • an alarm signal can be set off, or there can be an automatic shut-down of the knitting machine 1.
  • the preliminary regulating and balancing step further includes the step of individually displacing (R) each stitch cam 7 according to the relative corrective value, such as to reduce the difference between the respective yarn consumption datum of the corresponding yarn feeder 8 and the yarn consumption reference value 9.
  • the corrective value of the position of each stitch cam 7 or each corrective value of the position of each stitch cam 7 can correspond to a determined number of minimum unit displacements of the stitch cam 7 proportional to the respective value of the comparative result, or can correspond, for each comparative result, to a minimum unit displacement of the stitch cam 7.
  • step of individually displacing each stitch cam 7 can be cyclically performed a plurality of times up to when the or each comparison result is below the predetermined tolerance threshold for all the fixed drum yarn feeder 8 in function.
  • step of displacing (R) the cams 7 can be cyclically carried out by displacing the stitch cam 7 progressively with successive minimum unit displacements, or can be performed by carrying out a first displacement and then carrying out a cycle comprising the steps from the production of the knitted portion to the displacement of the cams (from step N to step R).
  • a stop step (S) of the preliminary step of regulating and balancing is performed and the steps of producing the knitted articles can proceed.
  • the process of the invention can further comprise the step of emitting (T) an alarm or shut-down signal in a case in which within a predetermined number of cycles it is not possible to bring the or each comparative result below the predetermined tolerance threshold for all the fixed-drum yarn feeders 8 functioning.
  • the process can further comprise the step of determining, on the knitting machine 1 or a second knitting machine 1', the yarn consumption reference value, the yarn consumption reference value per knitted zone 6a, 6b or the plurality of yarn consumption reference values per knitted zone 6a, 6b by means of a processing of the plurality of yarn 9 consumption data or yarn 9 consumption data per knitted zone using a third algorithm.
  • the third algorithm can comprise, for example, performing a mean, or a maximum value, or a minimum value, of the yarn consumption data or yarn consumption data per zone, or by selecting the consumption data relative to a portion 5 of balancing knitted fabric or an approved balancing knitted article 6.
  • the process can further comprise the step of receiving, on the knitting machine 1, the yarn consumption reference value, the yarn consumption reference value per knitted zone 6a, 6b or the plurality of yarn consumption reference values per knitted zone 6a, 6b, from a second knitting machine 1' on which the value has been detected or calculated.
  • the process can further comprise the step of transmitting the yarn consumption reference value, the yarn consumption reference value per knitted zone 6a, 6b or the plurality of yarn consumption reference values per knitted zone 6a, 6b calculated or detected, from the textile machine 1 to at least a second knitted machine 1' or to a plurality of knitting machines 1', 1".
  • the steps of receiving or transmitting the reference value can be automatically carried out by means of a net 15 that can be cables and/or wireless and which can be local or connected to the internet, or by transferring a memorising device connected in successive moments to the various knitting machine 1, 1', 1" for transferring the values in question.
  • the process can further comprise the step of automatically modifying the size of the knitted article 6 to enable production of a corresponding knitted article 6 having a different size on a second circular knitting machine 1' different from the above-mentioned circular knitting machine.
  • the process can further comprise the step of automatically modifying the size of the knitted article 6 such as to enable the production of a corresponding knitted article 6 having the same size on a second circular knitting machine 1' different from the above-cited circular knitting machine.
  • the step of automatically modifying the size can be carried out by modifying the yarn consumption reference value 9 per knitted zone 6a, 6b or the plurality of yarn consumption reference values per knitted zone 6a, 6b, detected or determined on the knitting machine according to a fourth algorithm also operating on a plurality of operating parameters of the knitting machine 1 and the second knitting machine 1' set in reciprocal relation.
  • the operating parameters can comprise at least one or more from among the following parameters: number of needles 4 in the cylinder 3, gauge of the cylinder needles, cylinder diameter, cylinder rotation velocity, number of feeds 10 or drop positions of the yarn 9 or number of yarn feeders, types of yarn used, etc.
  • the fourth algorithm can comprise a conversion of the yarn consumption reference values per knitted zone 6a, 6b in order to adapt to the second knitting machine 1', by applying a conversion formula which adapts the values proportionally to the difference, or to the percentage relation (or another) between the diameters of the two knitting machines, or between the number of needles of the two knitting machines, etc.
  • the process can further comprise the steps of displacing the positions of the additional stitch cams, operatively active on the additional needles 4 of the needle plate, similarly and contextually to what is carried out on the stitch cams of the needle cylinder 3.
  • the invention further relates to a process for producing knitted articles on at least a circular knitting machine for knitwear or hosiery, comprising a process for regulating a size of knitted articles according to what is described above, which is continuously performed during the production of the knitted articles or periodically, at regular intervals, predetermined or established by a user during the production of the articles.
  • the process for regulating the size can further be carried out when at least an operating condition selected from among the following obtains: during a transitory heating period of the knitting machine after start of production; after at least a maintenance intervention on the knitting machine; after a replacing of at least one component of the knitting machine; on a variation, above a predetermined threshold, of at least an environmental condition influencing the functioning of the knitting machine, for example environmental temperature or moisture.
  • the invention further relates to a software program for circular knitting machines for knitwear or hosiery configured such as to perform one or more steps of a process according to what is described above.
  • the above-mentioned process steps can be realised by more than one software program, for example some steps can be carried out by a first operating software installed on the control device 11 of the knitting machine, and other steps can be carried out by a second program or design software program installed on an external processor 16 operatively connectable to the knitting machine 1 via the internet 15 or a portable memorising device.
  • the invention further relates to a knitting machine 1 of the above-described type, which control device 11 is configured to perform at least some steps of the process of the above-described type and/or has the first software program cited above installed.
  • the invention as it is conceived is susceptible to numerous modifications and variants, all falling within the scope of the inventive concept, and the cited components can be replaced with other technically-equivalent elements.
  • the invention attains important advantages. Primarily the invention enables some of the drawbacks in the prior art to be obviated.
  • the invention further enables production of high-quality knitted articles that are substantially free of drawbacks, as well as reducing production waste.
  • the invention further enables effectively and efficiently controlling and regulating the production of the knitted articles automatically, reducing the interventions of the operators to a minimum.
  • the invention further enables realising productions of high dimensional uniformity, both in different temporal moments and in various operating conditions on a same machine, and also with respect to productions realised on a plurality of machines.
  • the invention further enables precisely and reliably controlling and regulating the sizes of the knitted articles produced on one or even on a plurality of knitting machines contemporaneously.
  • the invention further enables reducing the number of personnel required for controlling production, especially in plants in which numerous knitting machines are present.
  • the invention is also simple, sturdy and economical to realise, and guarantees high standards of repeatability and safety.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Machines (AREA)
  • Outer Garments And Coats (AREA)
  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
EP15179905.3A 2011-06-08 2012-05-29 A process for regulating the size of knitted articles under production in circular knitting machines for knitwear or hosiery Active EP2985372B1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PL15179905T PL2985372T3 (pl) 2011-06-08 2012-05-29 Proces regulowania rozmiaru dzianin w czasie produkcji w okrągłych maszynach dziewiarskich do wyrobów dziewiarskich lub wyrobów pończoszniczych
HRP20191819TT HRP20191819T1 (hr) 2011-06-08 2019-10-07 Postupak reguliranja veličine pletenih artikala koji se proizvode pomoću kružnih strojeva za pletenje za pletenu odjeću ili čarape

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT001030A ITMI20111030A1 (it) 2011-06-08 2011-06-08 Procedimento per regolare la taglia di articoli tessili in produzione su macchine tessili circolari per maglieria o calzetteria
EP12169736.1A EP2532776B1 (en) 2011-06-08 2012-05-29 A process for of adjusting the size of knitted articles under production in circular knitting machines for knitwear or hoisery

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
EP12169736.1A Division EP2532776B1 (en) 2011-06-08 2012-05-29 A process for of adjusting the size of knitted articles under production in circular knitting machines for knitwear or hoisery

Publications (2)

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EP2985372A1 EP2985372A1 (en) 2016-02-17
EP2985372B1 true EP2985372B1 (en) 2019-07-10

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EP12169736.1A Active EP2532776B1 (en) 2011-06-08 2012-05-29 A process for of adjusting the size of knitted articles under production in circular knitting machines for knitwear or hoisery
EP15179905.3A Active EP2985372B1 (en) 2011-06-08 2012-05-29 A process for regulating the size of knitted articles under production in circular knitting machines for knitwear or hosiery

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EP (2) EP2532776B1 (zh)
KR (1) KR101520525B1 (zh)
CN (1) CN102817167B (zh)
ES (2) ES2749162T3 (zh)
HR (2) HRP20151179T1 (zh)
IT (1) ITMI20111030A1 (zh)
PL (2) PL2532776T3 (zh)
TW (1) TWI498465B (zh)

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KR101506860B1 (ko) * 2014-04-04 2015-03-31 주식회사 동성정밀 가변형 선침드럼 및 그 가변형 선침드럼이 적용된 장갑편직기
CN105019121B (zh) * 2014-04-24 2018-10-26 山德霓股份公司 制造具有可变紧缩的针织纺织物品的方法和圆型纬编针织机以及针织纺织物品
CN110306287B (zh) * 2019-06-21 2021-03-16 西安工程大学 基于激光及机器视觉的袜机织针联合检测装置及方法
KR102071933B1 (ko) * 2019-09-17 2020-01-31 이지수 바디의 너비를 조정하여 안정적으로 직물을 생산하는 편직기
CN110923918B (zh) * 2019-11-21 2021-10-01 福建泉州凹凸精密机械有限公司 一种针织圆机起底编织工艺

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Also Published As

Publication number Publication date
ES2749162T3 (es) 2020-03-19
HRP20151179T1 (hr) 2016-01-01
TW201303101A (zh) 2013-01-16
HRP20191819T1 (hr) 2019-12-27
PL2532776T3 (pl) 2016-04-29
EP2985372A1 (en) 2016-02-17
KR20120136310A (ko) 2012-12-18
PL2985372T3 (pl) 2020-03-31
KR101520525B1 (ko) 2015-05-14
CN102817167B (zh) 2015-09-16
ES2552660T3 (es) 2015-12-01
EP2532776A1 (en) 2012-12-12
CN102817167A (zh) 2012-12-12
EP2532776B1 (en) 2015-08-19
ITMI20111030A1 (it) 2012-12-09
TWI498465B (zh) 2015-09-01

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