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US20190390378A1 - Knitted fabric and method and device for producing the knitted fabric - Google Patents

Knitted fabric and method and device for producing the knitted fabric Download PDF

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Publication number
US20190390378A1
US20190390378A1 US16/481,680 US201816481680A US2019390378A1 US 20190390378 A1 US20190390378 A1 US 20190390378A1 US 201816481680 A US201816481680 A US 201816481680A US 2019390378 A1 US2019390378 A1 US 2019390378A1
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US
United States
Prior art keywords
roving
thread
roller pair
drawn
knitting machine
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US16/481,680
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English (en)
Inventor
Thomas Mutschler
Hermann Schmodde
Michael Lau
Johannes Barth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Terrot GmbH
Original Assignee
Terrot GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Publication of US20190390378A1 publication Critical patent/US20190390378A1/en
Abandoned legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B9/00—Circular knitting machines with independently-movable needles
    • D04B9/14—Circular knitting machines with independently-movable needles with provision for incorporating loose fibres, e.g. in high-pile fabrics
    • 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
    • D04B1/02—Pile fabrics or articles having similar surface features
    • D04B1/025—Pile fabrics or articles having similar surface features incorporating loose fibres, e.g. high-pile fabrics or artificial fur
    • 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
    • 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
    • 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
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2403/00—Details of fabric structure established in the fabric forming process
    • D10B2403/03—Shape features
    • D10B2403/033—Three dimensional fabric, e.g. forming or comprising cavities in or protrusions from the basic planar configuration, or deviations from the cylindrical shape as generally imposed by the fabric forming process

Definitions

  • the present invention relates to a method for producing a knitted fabric, whereby a sliver in form of a roving of fiber bundles that have not been strengthened is supplied to a roving drawing and strengthening unit, which comprises a stretching unit with at least two stretching roller pairs being successively arranged in thread transport direction and a spinning nozzle device being arranged downstream of the stretching unit in the thread transport direction and is drawn by the at least two stretching roller pairs, wherein at least one inlet roller pair and one outlet roller pair of the stretching unit are controllably driven according to the pattern of the knitted fabric to be formed on the knitting machine in such a way that the thread thickness of the drawn roving is varied throughout its length by changing the relative speed between the inlet roller pair and the outlet roller pair, the drawn roving exiting the stretching unit is supplied to the spinning nozzle device and is strengthened by it by means of applying pressurized air, and thereupon the drawn, strengthened roving is supplied to the knitting machine directly or by using a means for transport or clamping.
  • the present invention furthermore relates to a device for producing a knitted fabric which comprises at least one knitting machine, at least one roving drawing and strengthening unit being provided upstream of the knitting machine in thread transport direction, which comprises at least one stretching unit with at least two stretching roller pairs being successively arranged in thread transport direction, wherein at least one driven roller of an inlet roller pair and at least one driven roller of an outlet roller pair of the stretching unit are coupled with at least one drive, which is/are coupled with the pattern control for the knitting machine.
  • the present invention relates to a knitted fabric which is formed of a drawn, strengthened roving with a thread thickness varying along its length, wherein the thread thickness of the drawn, strengthened roving is formed depending on the pattern of the knitted fabric.
  • the document DE 10 2011 053 396 discloses a device and a method for producing a knitted fabric, whereby a knitting machine is directly coupled with a roving drawing and strengthening unit, which comprises a stretching unit for drawing a roving and a spinning nozzle device for temporarily strengthening the drawn roving, wherein the length of thread strengthening segment subsequent to the spinning nozzle device is defined by a clamping roller pair.
  • a roving drawing and strengthening unit which comprises a stretching unit for drawing a roving and a spinning nozzle device for temporarily strengthening the drawn roving, wherein the length of thread strengthening segment subsequent to the spinning nozzle device is defined by a clamping roller pair.
  • the drawn, strengthened roving can be led directly from the roving drawing and strengthening unit across a long segment appropriate for industrial applications to the knitting machine.
  • particularly soft and voluminous knitted fabrics can advantageously be produced.
  • threads with varying thread thickness are known from the prior art, however, the thread thickness of such so-called knop threads is merely changed with regard to the look of the knitted fabric being produced from the thread.
  • the knop thread can comprise thickenings, so called knops, at regular or irregular distances. Threads with knops varying in their length and their distance to each other are especially used for the production of knitted fabrics which are supposed to give the impression that they have been hand-knitted.
  • the device described in the document DE 1 910 034 A comprises a controllable drive device running with a variable rotation speed.
  • the drive unit is connected with a rear set of stretching devices in order to drive it completely independently from a frontal set of stretching devices allocated to this set, which is provided at a distance from the rear stretching devices.
  • the supply of a strand of a textile material to the stretching zone extending between the sets of stretching devices can thus be regulated completely independently of the speed with which the drawn roving is delivered by the frontal set of stretching devices.
  • a randomly changing signal is generated according to the method, which causes for the operating speed of the rear set of stretching devices to be controlled completely independently from the operating speed of the front set of stretching devices.
  • a combination of spinning device and knitting machine wherein a fiber compound or a thread of variable thickness can be produced out of a roving with the spinning device and can be supplied to the loop forming elements of the knitting machine.
  • at least two roller pairs of a stretching unit of the spinning device comprise their own driving units being controllable independently of each other, by which the relative speed between an inlet and an outlet roller pair of the stretching unit can be changed or friction spinning devices with at least one feed roll are provided on the machine, whose speed is controllable in relation to a pair of draw-off rollers.
  • knitted fabric with a pattern can be produced, which is generated by the formation of loops with a varying fiber compound or thread thickness, wherein the pattern is formed by variation of the fiber compound or thread thickness in course direction and/or in wale direction.
  • the object is on the one hand solved by a method of the of the above-mentioned type, whereby the thread supply speed of the drawn, strengthened roving to the knitting machine is set depending on the loop size to be knit by the knitting machine by controlling the rotation speed of at least one roller of the outlet roller pair of the stretching unit.
  • the material use when producing a knitted fabric can be optimized by processing the drawn, strengthened roving varying in its thickness.
  • the thread thickness of the drawn, strengthened roving exiting the roving drawing and strengthening unit is changed for this purpose with the roving drawing and strengthening unit coupled with the knitting machine according to a pattern knit by the knitting machine.
  • a sliver in form of a fiber bundle that has not been strengthened is supplied to a stretching unit of the roving drawing and strengthening unit, which is drawn by at least two stretching roller pairs of the stretching unit successively arranged in thread transport direction and strengthened by a spinning nozzle device provided subsequent to the stretching unit in thread transport direction.
  • a spinning nozzle device provided subsequent to the stretching unit in thread transport direction.
  • the strengthening segment can, for example, be closed by a clamping roller pair subsequent to the spinning nozzle device in thread transport direction, whereupon the drawn, strengthened roving varying in thickness can be easily transported over long distances directly from the roving drawing and strengthening unit to the knitting machine arranged subsequent to it in thread transport direction.
  • At least one inlet roller pair, that is the first stretching roller pair of the stretching unit in thread transport direction, and one outlet roller pair, that is the last stretching roller pair of the stretching unit in thread transport direction, are controllably driven according to the pattern of the knitted fabric to be formed on the knitting machine.
  • the control thereby happens in such a way that the thread thickness of the drawn roving generated by the stretching unit is varied throughout its length by changing the relative speed between the inlet roller pair and the outlet roller pair.
  • the thread thickness of the drawn roving can be varied throughout its length according to pattern by changing the relative speed between the inlet roller pair and the outlet roller pair.
  • the rotation speed of the controlled inlet roller pair is preferably changed that more or less sliver is supplied to the stretching unit depending on the set rotation speed.
  • the rotation speed of the outlet roller pair can for example be kept constant at the same time.
  • the rotation speed of the outlet roller pair can also be varied relative to an unchanging speed of the inlet roller pair depending on the pattern to be knit.
  • both the inlet and the outlet roller pair can be controllably driven in such a way that the thread thickness of the drawn roving exiting the stretching unit can be adjusted to the pattern to be knit over the relative speed between the inlet and the outlet roller pair.
  • the rotation speed of the controlled inlet roller pair can be changed according to pattern.
  • the thread thickness of the drawn, strengthened roving to be produced increases.
  • the thread thickness of the drawn, strengthened roving to be produced decreases with a reduction of the rotation speed of at least one driven roller of the inlet roller pair relative to the rotation speed of at least one driven roller of the outlet roller pair.
  • both rollers of a stretching roller pair can also be driven.
  • the sliver supplied to the stretching unit can furthermore also be drawn by more than two, for example three or four stretching roller pairs.
  • the spinning nozzles of the spinning nozzle device prefferably twist the drawn roving in thread transport direction and convey it automatically, wherein the spinning nozzle device preferably comprises at least two spinning nozzles which work pneumatically and apply compressed air to the drawn roving exiting the stretching unit with respectively opposite rotation directions.
  • the at least one clamping roller of a clamping roller pair provided downstream of the spinning nozzle device in thread transport direction is driven, wherein, depending on the embodiment of the method according to the invention, the rotation speed of the at least one clamping roller can herein also be changed, for example depending on the pattern to be knit.
  • the thread supply speed of the drawn, strengthened roving to the knitting machine is furthermore set depending on the loop size to be knit by the knitting machine by controlling the rotation speed of at least one driven roller of the outlet roller pair of the stretching unit.
  • the change of the thread supply speed is thus enabled by adjusting the rotation speed of the last stretching roller pair of the stretching unit in thread transport direction, wherein the rotation speed of the outlet roller pair is to be set higher for an increasing thread supply speed and its rotation speed is to be set lower for attaining a decreasing thread supply speed.
  • both the thread fineness or thread thickness, that is the mass of the thread per thread section, and the thread supply amount are thus adjusted to the respective loop size to be knit of the knit fabric to be formed.
  • both rollers of the outlet roller pair can also be driven according to pattern.
  • loops with different sizes can be knit on the knitting machine, wherein the loop size to be knit is facilitated by varying the sinking depth on the knitting machine.
  • By knitting loops with different sizes transparent and less transparent areas in a knitted fabric can be produced.
  • knitted fabrics can furthermore be produced, which comprise an almost constant surface weight and are characterized by a nearly homogenous transparency or opaqueness.
  • leggings or tights known from the prior art are, if they are not assembled out of different parts, consistently formed out of one knit fabric with consistent thread thickness. This leads to the leggings or the tights being transparent or translucent, for instance in the buttocks area due to an increased stretching. In order to prevent for underwear and/or skin to shine through, the leggings or the tights need to be bought correspondingly large, which in turn has the disadvantage of it slipping more easily and not being tight enough, for example in the calf area.
  • the diameter of the knit fabric is largely defined by the constructive conditions, such as cylinder diameter and number of needles. This can only be changed within certain limits by variating the loop size. Producers use this effect with leggings. With increasing loop size, the diameter of the knit fabric is also increasing. Thus, a certain shape can be given to a leggings leg. However, this shaping is only possible with a previously set thread thickness. In the prior art, the opaqueness is therefore higher with small loops and thus a small diameter of the knit fabric than with big loops and thus a big diameter of the knit fabric.
  • the stretching unit is therefore controlled in such a way that the larger the loop size to be knit by the knitting machine, the smaller the relative speed between the inlet roller pair and the outlet roller pair and the larger the rotation speed of the at least one driven roller of the outlet roller pair is set, and the smaller the loop size to be knit by the knitting machine, the larger the relative speed between the inlet roller pair and the outlet roller pair and the smaller the rotation speed of the at least one driven roller of the outlet roller pair is set.
  • knitted fabrics such as leggings or tights, an unsightly show-through of underwear and/or skin, for example in the buttocks area, can thereby be prevented due to an increased stretching in this area.
  • the loops in areas in which the produced knitted fabric is exposed to a higher stretching during wear are hereby on the one hand knitted larger and on the other hand the thread thickness is enlarged depending on the size of the loops. Accordingly, the thread thickness is adjusted depending on the size of the loops to be formed, wherein the thread thickness of the drawn, strengthened roving supplied to the knitting spot is increasing with increasing loop size and with decreasing loop size its thread thickness is decreasing.
  • the loop size and the thread thickness of the knitted fabric to be formed are thus set according to pattern.
  • the relative speed between the inlet roller pair and the outlet roller pair is therefore set inversely proportional to the loop size to be knit by the knitting machine and the rotation speed of the at least one driven roller of the outlet roller pair directly proportional to the loop size.
  • the drawn, strengthened roving is supplied to the knitting machine with constant thread tension.
  • the drawn, strengthened roving can also be supplied to the knitting machine with a thread tension that is not constant, but can for example be adjusted to the knitting pattern.
  • auxiliary thread supply speed to the stretching unit is controlled depending on the loop size of the knitted fabric to be formed on the knitting machine and/or depending on stretching characteristics of the auxiliary thread.
  • the auxiliary thread supply speed to the stretching unit can also be controlled depending on the pattern of the knitted fabric to be formed on the knitting machine.
  • the auxiliary thread is drawn by the last stretching roller pair of the stretching unit in thread transport direction, that is the outlet roller pair. Since the individual rollers of the stretching unit are possibly moving with a differing rotation speed, the auxiliary thread supplied to the last stretching unit roller pair of the stretching unit is only exposed to a single rotation speed so that the supply of the auxiliary thread can be suitably adjusted to this rotation speed and thus to the pattern of the knitted fabric to be formed on the knitting machine.
  • the auxiliary thread can, however, also be supplied to the roving on another spot, for example before supplying it to the stretching unit.
  • an inelastic thread a so-called core thread, or an elastic thread, a so-called elastane thread
  • the drawn, strengthened roving comprising the auxiliary thread to be supplied to the knitting machine can be provided with heightened stability.
  • auxiliary thread for example two or three auxiliary threads can also be supplied to the roving.
  • auxiliary threads are supplied to the stretching unit by separate auxiliary thread supply devices. They can, however, also be transported to the roving by means of a single auxiliary thread supply device.
  • a knitted fabric By inserting the at least one auxiliary thread into the roving and the thread thickness or thread count adjusted to the respective loop size to be knit, a knitted fabric can preferably be produced, with which an unsightly shimmer-through effect due to a large stretching, which is, as stated above, often the case with leggings or tights in the buttocks area, can be prevented.
  • a knitted fabric can be produced, which comprises a nearly constant transparency or opaqueness and a nice even overall appearance without unwanted shimmer-through effects, especially when being worn.
  • the at least one auxiliary thread such as at least one elastane thread
  • the at least one auxiliary thread can be inserted into the roving as a core thread, that is an auxiliary thread being encased by fibers of the roving.
  • This has advantages in the future product regarding clothing physiology for the person doing the wearing.
  • the elastane then does not lie on the skin, as is the case with a plating, but is covered by the fibred sheathing.
  • two or more drawn, strengthened rovings can, however, also be formed by a shared roving and strengthening unit and be subsequently supplied to one or several separate knitting system(s) of the knitting machine.
  • roving drawing and strengthening units it is also possible for several roving drawing and strengthening units to be combined to a module and to be jointly electronically controlled. Hereby, either all roving drawing and strengthening units or only individual roving drawing and strengthening units can be combined to a module.
  • a modular operation of the roving drawing and strengthening units has proven to be particularly advantageous with regard to small circular knitting machines.
  • one knitting system each of the knitting machine is supplied with drawn, strengthened roving by at least two of the roving drawing and strengthening units.
  • two, three, four or more than four strands of drawn, strengthened roving can be generated separately and be joined on the respective knitting system, that is the respective loop forming spot.
  • the object of the present invention is furthermore solved by a device of the above-mentioned type, whereby the knitting machine comprises a sinking depth adjustment device, which is coupled with the pattern control for the knitting machine and the at least one drive for the at least one driven roller of an outlet roller pair.
  • a drawn, strengthened roving with varying thread thickness can be formed by the device according to the invention, whose material use is ideally adjusted to the loop structure to be formed on the knitting machine.
  • the knitting machine is coupled with a roving drawing and strengthening unit, which comprises at least one stretching unit with at least two clamping roller pairs successively arranged in thread transport direction, a spinning nozzle device provided downstream in thread transport direction and preferably, but not necessarily, a clamping roller pair limiting the strengthening segment of the spinning nozzle device.
  • a roving drawing and strengthening unit which comprises at least one stretching unit with at least two clamping roller pairs successively arranged in thread transport direction, a spinning nozzle device provided downstream in thread transport direction and preferably, but not necessarily, a clamping roller pair limiting the strengthening segment of the spinning nozzle device.
  • the first clamping roller pair of the stretching unit in thread transport direction is supplied with a sliver in form of a fiber bundle that has not been strengthened, which is stretched by the individual stretching roller pairs and strengthened by means of the spinning nozzle device.
  • the drawn, strengthened roving can obtain additional stability by the successively arranged clamping roller pair.
  • At least one roller each of the respective stretching roller pair is driven by a drive, wherein both rollers can also be driven.
  • a change in thread thickness is particularly achieved by varying the rotation speed of the inlet roller pair relative to the outlet roller pair of the stretching unit.
  • the spinning nozzle device being successively arranged to the stretching unit in thread transport direction preferably comprises two self-conveying spinning nozzles, whereby the transport of the drawn roving takes place through an air current of the spinning nozzles directed towards the working direction.
  • both spinning nozzles are successively arranged in thread conveying direction, wherein they are working pneumatically and comprise a rotary current opposing one another.
  • the clamping roller pair being preferably arranged successively to the spinning nozzle device in thread transport direction, can also be coupled or couplable with a drive, by which at least one clamping roller of the clamping roller pair is driven.
  • a drive by which at least one clamping roller of the clamping roller pair is driven.
  • the knitting machine comprises a sinking depth adjustment device which is coupled to the pattern control for the knitting machine.
  • the loop size to be knit can advantageously be varied by means of the sinking depth adjustment device.
  • the coupling of the sinking depth adjustment device with the pattern control of the knitting machine facilitates the loop size to be changed depending on a pattern to be knit.
  • a loop-forming needle is more or less driven out by means of the sinking depth adjustment device.
  • knitted fabrics such as leggings or tights
  • knitted fabrics can thus be produced, which comprise a nearly identical level of transparency or opaqueness, even when being worn.
  • an unsightly show-through of skin and/or underwear due to an increased stretching of the knitted fabric for example in the buttocks area of a female or male wearer
  • the loops are hereby formed larger in the areas, in which the knitted fabrics are exposed to higher stretches, for example in the buttocks area of a female or male wearer, wherein the thread thickness of the knitted fabric is increased at the same time.
  • the thread thickness can, however, also be reduced with increasing loop size.
  • the adjustment of the thread thickness can also take place according to pattern.
  • the device comprises a measuring device for determining a thread tension of a drawn, strengthened roving exiting the roving drawing and strengthening unit.
  • the measuring device can furthermore also be used for determining a thread transport speed or another process parameter.
  • the spinning and/or knitting process is controlled by means of the data determined by the measuring device, wherein hereby one or several process parameters such as the rotation speed of one or several stretching roller pairs can be adjusted.
  • the device comprises at least one auxiliary thread supply device connected to the stretching unit and controllable by the pattern control for the knitting machine and/or depending on the stretching characteristics of an auxiliary thread suppliable to the stretching unit.
  • the auxiliary thread supply device comprises a discharge realized by the outlet roller pair of the stretching unit, that is the last roller pair in thread transport direction, whereby the auxiliary thread can be received by the last stretching roller pair and bound into the drawn thread.
  • the auxiliary thread By supplying the auxiliary thread only during the main drawing, the auxiliary thread only runs through one clamping spot of the stretching unit.
  • the speed of the auxiliary thread supply device can thereby be ideally adjusted to the rotation speed of the last stretching unit roller pair and/or the pattern control of the knitting machine.
  • the auxiliary thread supply device can also be controlled depending on the stretching characteristics of the auxiliary thread.
  • the auxiliary thread can be formed elastic or inelastic.
  • a core-sheath thread is preferably formed, in which the core is formed by the auxiliary thread.
  • more than one auxiliary thread for example two or three auxiliary threads can be supplied to the drawn, strengthened roving.
  • an unsightly shimmer-through effect of the produced knitted fabric such as a leggings or a tight, can advantageously be prevented when the knitted fabric is stretched. Furthermore, a shimmer-through effect can also be prevented by enlarging the loops in combination with the increase of the thread thickness in areas of high levels of stretching.
  • roving drawing and strengthening units can also be combined to a module and be coupled with regard to control.
  • Such an application is to be considered as advantageous, particularly with regard to the usage with large circular knitting machine.
  • all or only individual roving drawing and strengthening units can herein be coupled with regard to control.
  • the object of the present invention is furthermore solved by a knitted fabric of the above-mentioned type in which the thread thickness of the drawn, strengthened roving is formed depending on the respective loop size of the knitted fabric, wherein the thread thickness increases with increasing loop size and the thread thickness decreases with decreasing loop size.
  • the material usage can be ideally adjusted to the loop structure of the knitted fabric.
  • the thread thickness of the drawn, strengthened roving used for its production is furthermore formed depending on the respective loop size of the knitted fabric, wherein the thread thickness increases with increasing loop size and the thread thickness decreases with decreasing loop size.
  • the knitted fabric is a seamless, circularly knitted knitted fabric with changing diameter and yet constant opaqueness.
  • the knitted fabric can for example be a stocking, whose diameter increases from bottom to top in the calf area, whereby the loop size increases from bottom to top in this calf area and yet the opaqueness remains the same, since, according to the invention, both more as well as thicker thread is supplied to the knitting spot when knitting this calf area from bottom to top, that is with loops increasing in size. The same applies vice versa when knitting this calf area from top to bottom, where both less as well as thinner thread is supplied to the knitting spot with loops decreasing in size.
  • the knitted fabric according to the invention is thereby formed in such a way that it constantly comprises the same transparency or opaqueness in a stretched or worn state.
  • the thread thickness can, however, also decrease with increasing loop size so that apart from especially opaque, especially transparent areas can be produced.
  • the knitted fabric can be a knitted fabric comprising a pattern.
  • FIG. 1 schematically shows a section of a drawn roving with varying thread thickness formable as an intermediate product in an embodiment of the method according to the invention in a side view;
  • FIG. 2 schematically shows a possible embodiment of a device according to the invention in a cut side view
  • FIG. 3 schematically shows another possible embodiment of a device according to the invention in a cut side view.
  • FIG. 1 schematically shows a section of a drawn roving 4 b formable as an intermediate product of an embodiment of the method according to the invention in a side view, wherein the roving 4 b comprises a length l in the shown example.
  • the roving section of the roving 4 b shown in FIG. 1 comprises three areas 41 , 41 ′, 42 , which are characterized by different thread thicknesses d, d′.
  • the roving 4 b comprises a larger thread thickness d′ in the area 42 than in the areas 41 , 41 ′.
  • thread thickness d, d′ is adjusted to a pattern to be knit on the knitting machine, to which the roving 4 b is supplied in a temporarily strengthened form as a drawn, strengthened roving.
  • the thread thickness d, d′ and the length of the areas in which the roving 4 b comprises a larger or smaller diameter, are thereby formed according to pattern.
  • FIG. 1 The thread thickness d, d′ and the length of the areas in which the roving 4 b comprises a larger or smaller diameter, are thereby formed according to pattern.
  • the roving 4 b can hereby also comprise a constant thread thickness d, d′ over a long distance.
  • the thread thickness d, d′ can also vary at very short distances.
  • the areas 41 , 41 ′, 42 , in which the thread thickness d, d′ changes, can regularly recur or be formed irregularly according to pattern.
  • the drawn roving 4 b consists of individual fibers 40 , which encompass an auxiliary thread not visible here.
  • the auxiliary thread can be formed elastic or inelastic.
  • a drawn roving, which does not comprise an auxiliary thread or more than one auxiliary thread, can also be formed.
  • FIG. 2 schematically shows an embodiment of an embodiment of a device 1 according to the invention in a cut side view, wherein the same reference signs as in FIG. 1 describe the same component and it is being referred to the above description in this regard.
  • the device 1 shown in FIG. 2 comprises a knitting machine 2 as well as a roving drawing and strengthening unit 10 coupled with the knitting machine 2 .
  • the roving drawing and strengthening unit 10 comprises a stretching unit 5 , a spinning nozzle device 6 provided downstream of the stretching unit 5 in a thread transport direction A and, in the shown embodiment, a clamping roller pair 7 subsequent to the to the spinning nozzle device 6 in the thread transport direction A.
  • the stretching unit 5 comprises three stretching roller pairs 51 , 52 , 53 successively arranged in the thread transport direction A, provided at distances 561 , 562 to each other.
  • the device 1 can, however, also comprise only two stretching roller pairs 51 , 53 or more than three stretching roller pairs 51 , 52 , 53 .
  • the stretching roller pairs 51 , 52 , 53 are in turn formed by two rollers 511 , 512 , 521 , 522 , 531 , 532 , respectively.
  • a sliver 4 a in form a fiber bundle that has not been strengthened is supplied to the first stretching roller pair 51 of the stretching unit 5 in thread transport direction A, the inlet roller pair.
  • the sliver 4 a is provided by a roving supply unit 3 , which comprises a flyer bobbin 31 and is led to the inlet roller pair 51 .
  • the sliver 4 a is stretched by means of the stretching roller pairs 51 , 52 , 53 .
  • one roller 511 , 521 , 531 each of the respective stretching roller pair 51 , 52 , 53 is coupled with a drive 8 , 8 ′, 8 ′′, which drives the respective roller 511 , 521 , 531 .
  • the rollers 512 , 522 , 532 of the respective stretching roller pair 51 , 52 , 53 which are not driven, are pressed against the driven rollers 511 , 521 , 531 by means of a stretching unit pressure arm 54 using springs 541 in the exemplary shown device 1 according to the invention.
  • the rollers 512 , 522 , 532 are mounted in such a way that they can rotate in opposite direction to the rollers 511 , 521 , 531 .
  • the drives 8 , 8 ′, 8 ′′ are coupled with a pattern control 9 , wherein the rotation speed x 1 of the drive 8 of the roller 511 of the inlet roller pair 51 is particularly controlled relative to the rotation speed x 3 of the outlet roller pair 53 depending on a pattern to be knit by the knitting machine 2 by changing the rotation speed x 1 of the inlet roller pair 51 in the shown example, wherein the rotation speed x 2 of the stretching roller pair 52 follows that of the stretching roller pair 51 with a predefined or selectable transmission ratio and the rotation speed x 3 of the stretching roller pair 53 is kept constant.
  • the pattern control 9 is furthermore coupled with a schematically depicted sinking depth adjustment device 91 of the knitting machine 2 .
  • the process is advantageously controlled in such a way that the thread thickness d′ increases with increasing loop size and the thread thickness d also decreases with decreasing loops so that knitted fabrics such as leggings or tights can be produced, which comprise a nearly constant transparency or opaqueness even when being worn, whereby an unsightly show-through on spots which are potentially more stretched than others, can be prevented.
  • the process can, however, also be controlled in such a way that the thread thickness d, d′ decreases with increasing loop size and vice versa. Accordingly, particularly transparent areas in the knitted fabric can be formed.
  • the drawn roving 4 b exiting the stretching unit 5 subsequently enters a spinning nozzle device 6 .
  • a rotation of the drawn roving 4 b by means of air jets takes place.
  • the spinning nozzle device 6 thereby consists of two successively arranged spinning nozzles 61 , 62 which are air twirling nozzles.
  • the air currents generated by the two spinning nozzles 61 , 62 comprise opposing rotation directions B, C so that a false twist is formed.
  • a clamping roller pair 7 is provided subsequent to the spinning nozzle device 6 in the thread transport direction A, which comprises two clamping rollers 71 , 72 being rotatable in opposite directions to each other.
  • the drawn, strengthened roving 4 c exiting the spinning nozzle device 6 is led through the clamping rollers 71 , 72 pressed against each other, so that on the one hand a passage and on the other hand a clamping spot for the roving 4 c is formed.
  • the clamping spot limits the fiber strengthening segment after the spinning nozzle device 6 .
  • the drawn, strengthened roving 4 d exits the clamping roller pair, which is subsequently directly supplied to the knitting machine 2 .
  • an inelastic auxiliary thread 22 is supplied to the roving 4 b by means of an auxiliary thread supply device 220 , which serves for increasing the strength of the drawn, strengthened roving 4 d.
  • the inelastic auxiliary thread 22 is thereby drawn off a spool 24 by an auxiliary thread clamping roller pair 23 , in the shown embodiment supplied to the stretching unit 5 via a thread guiding tube 26 and integrated into the roving 4 b.
  • the inelastic auxiliary thread 22 is supplied to the last stretching roller pair of the stretching unit 5 in the thread transport direction A, that is the outlet roller pair 53 , whereby the thread supply speed v 4 of the auxiliary thread 22 thus only needs to be adjusted to the rotation speed x 3 of the outlet roller pair 53 .
  • the thread tension of the inelastic auxiliary thread 22 can be checked by means of a thread tension measuring device 43 provided between the auxiliary thread clamping roller pair 23 and the stretching unit 5 .
  • the device 1 , 1 ′ comprises the thread tension measuring device 43 for determining a thread tension of a roving 4 d exiting the auxiliary thread clamping roller pair 23 so that the roving 4 d can be supplied to the knitting machine 2 with constant thread tension.
  • an elastic auxiliary thread 25 for example an elastane thread, is furthermore supplied to the roving 4 d by means of an additional auxiliary thread supply device 210 .
  • This elastic auxiliary thread 25 is led over a thread tension measuring device 42 by means of a circumferential drive with the possibility of setting the exact auxiliary thread tension and then supplied to the stretching roller pair 53 .
  • the elastic auxiliary thread 25 along with the inelastic auxiliary thread 22 , is supplied to the stretching unit 5 via the thread guiding tube 26 with a thread supply speed v 5 .
  • the auxiliary thread supply device 220 , 210 is controlled by means of the pattern control and/or the stretching characteristics of the auxiliary thread 22 , 25 .
  • the auxiliary thread 23 , 25 can be inserted according to pattern.
  • it can be chosen whether an elastic auxiliary thread 25 or an inelastic auxiliary thread 22 is used.
  • it can also be decided whether only one auxiliary thread 22 or 25 or, if necessary, several auxiliary threads 22 , 25 are supplied to the roving 4 b. Insofar as several auxiliary threads 22 , 25 are inserted, they should, as shown in FIG.
  • auxiliary thread supply devices 220 , 210 with regard to potentially differing auxiliary thread tensions.
  • several auxiliary threads can also be supplied by means of a single auxiliary thread supply device.
  • knitted fabrics with loops of different sizes can easily be produced with the device 1 , 1 ′ according to the invention, whereby very transparent or opaque knitted fabrics can be provided with regard to the thread thickness d, d′ variable depending on the loop size.
  • the thread supply speed from the roving drawing and strengthening unit to the knitting machine is varied which is realized by changing the rotation speed of the last stretching roller pair in thread transport direction A, that is the outlet roller pair 53 .
  • a knitted fabric with differing technical characteristics can furthermore be produced by changing the thread thickness or thread count.
  • the thread thickness the fiber content in the finished thread is changed in the method according to the invention.
  • the auxiliary thread fineness is set.
  • conductive auxiliary threads can for example be sheathed with a different number of fibers which generates partially different characteristics in the respectively produced knitted fabric.
  • the present invention it is possible to influence the rub resistance of a knitted fabric by adjusting the loop size and the thread count.
  • the present invention can furthermore be used to influence the functional characteristics of a knitted fabric such as their moisture transport characteristics and/or heat retention properties.
  • the thermal conductivity and/or the thermal isolating characteristics of knitted fabric can furthermore also or alternatively be influenced by means of the present invention.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Knitting Of Fabric (AREA)
  • Knitting Machines (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US16/481,680 2017-01-27 2018-01-18 Knitted fabric and method and device for producing the knitted fabric Abandoned US20190390378A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102017101597.3 2017-01-27
DE102017101597.3A DE102017101597B4 (de) 2017-01-27 2017-01-27 Verfahren zum Herstellen einer Maschenware
PCT/IB2018/050298 WO2018138605A1 (de) 2017-01-27 2018-01-18 Maschenware sowie verfahren und vorrichtung zum herstellen dieser maschenware

Publications (1)

Publication Number Publication Date
US20190390378A1 true US20190390378A1 (en) 2019-12-26

Family

ID=61094557

Family Applications (1)

Application Number Title Priority Date Filing Date
US16/481,680 Abandoned US20190390378A1 (en) 2017-01-27 2018-01-18 Knitted fabric and method and device for producing the knitted fabric

Country Status (8)

Country Link
US (1) US20190390378A1 (de)
EP (1) EP3408436B1 (de)
JP (1) JP2020505526A (de)
KR (1) KR20190107134A (de)
CN (1) CN110249086A (de)
DE (1) DE102017101597B4 (de)
TW (1) TW201839197A (de)
WO (1) WO2018138605A1 (de)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DD51957A (de)
NL132929C (de) 1961-02-18 1900-01-01
LU50788A1 (de) 1965-04-08 1966-09-29
US3449899A (en) 1968-03-01 1969-06-17 Electro Matic Corp Variable count and slubbing apparatus and method
DE102006037714A1 (de) * 2006-08-07 2008-02-14 Wilhelm Stahlecker Gmbh Vorrichtung zum Herstellen einer Maschenware
DE102011053396B3 (de) 2011-09-08 2012-08-23 Terrot Gmbh Vorrichtung und Verfahren zur Herstellung von Maschenware
EP3031967B1 (de) 2014-12-11 2019-02-27 SIPRA Patententwicklungs- und Beteiligungsgesellschaft mbH Maschine und Verfahren zur Herstellung von Maschenware
DE102015110980A1 (de) 2015-07-07 2017-01-12 Rieter Ingolstadt Gmbh Streckwerk mit mehreren Faserbandführungen

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Publication number Publication date
WO2018138605A1 (de) 2018-08-02
EP3408436A1 (de) 2018-12-05
DE102017101597A1 (de) 2018-08-02
KR20190107134A (ko) 2019-09-18
EP3408436B1 (de) 2020-03-11
TW201839197A (zh) 2018-11-01
JP2020505526A (ja) 2020-02-20
DE102017101597B4 (de) 2019-09-26
CN110249086A (zh) 2019-09-17

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