TW201730395A - Device and method for producing knitted fabric - Google Patents

Abstract

The present invention relates to a device and a method for producing knitted fabric with a knitting machine and a roving drawing and strengthening unit, which comprises a roving supply unit with at least one roving, an auxiliary thread supply unit with at least one auxiliary thread, a stretching unit coupled to the roving supply unit for supplying the roving and the auxiliary thread supply unit for supplying the auxiliary thread, a spinning nozzle provided downstream from the stretching unit in a roving conveying direction of the device forming a fiber strengthening segment by applying compressed air and an end thread gripping roller pair rotatable in opposite directions provided downstream from the spinning nozzle device in the roving conveying direction delimiting the fiber strengthening segment. In order to be able to reliably produce a soft knitted fabric using at least one auxiliary thread for forming the roving with a device respectively a method of the said type, at least one auxiliary thread gripping roller pair rotatable in opposite directions, comprising an adjustable rotational speed is provided between the auxiliary thread supply unit and the stretching unit according to the invention with the device according to type, between whose auxiliary thread gripping rollers the auxiliary thread is led, respectively the auxiliary thread is led between the auxiliary thread supply unit and the stretching unit through at least one auxiliary thread gripping roller pair rotatable in opposite directions, comprising an adjustable rotational speed according to the invention with the method according to type.

Description

Apparatus and method for manufacturing knitted fabric

The invention first relates to a device for manufacturing a knitted fabric by a knitting machine and a drawing and reinforcing unit, comprising: a roving supply unit having at least one roving; an auxiliary yarn supply unit having at least one auxiliary yarn; and an stretching unit a roving supply unit for supplying the roving and an auxiliary yarn supply unit for supplying the auxiliary yarn; a spinning nozzle disposed in the roving conveying direction of the apparatus downstream of the stretching unit, and forming a fiber-reinforced region by applying compressed air And a pair of end yarn gripping rollers that rotate in opposite directions, disposed in the roving transport direction downstream of the spinning nozzle device, and constricting the fiber reinforced section. The invention further relates to a method of manufacturing a knitted fabric, wherein at least one roving is supplied to the stretching unit by the auxiliary yarn supplying unit by the roving supply unit and the at least one auxiliary yarn, and the compressed air is spun by the fiber reinforced section The nozzle means is applied to the roving leaving the stretching unit and including the drawing of the auxiliary yarn, the roving being reinforced, wherein the fiber reinforced section is confined by the pair of end yarn gripping rollers that rotate in opposite directions, including The draw reinforced roving of the auxiliary yarn is guided through the end yarn grip roller pair in a clamped manner and fed to the knitting machine from the end yarn of the end yarn grip roller pair.

In order to be able to manufacture knitted fabrics, which are characterized by a particularly soft touch and richness, prior art techniques are known to have a variety of practices. In particular, it is proposed not to use custom yarns which are provided with a permanent reinforcement on the bobbin to produce a knitted fabric, but instead to form a yarn bundle which is only temporarily reinforced, which is supplied directly to the knitting needle of the knitting machine by means of a corresponding guiding tool. And there used to knit a knitted fabric.

Such temporarily strengthened yarn bundles are also referred to as pseudo-strands. False stocks are typically self-torting, whereby they release the twist by pulling the two ends of the fake strands.

The device and method for producing such a knitted fabric are especially recommended in document WO 2009/043187 A1. In this document, the fiber combination is drawn in the stretching unit to the desired fineness, and the area between the stretching unit and the knitting needle is reinforced by the pneumatically operated spinning nozzle, and the knitting needle is transported to the knitting machine. . Permanently reinforced false strands are formed by the spinning nozzles, which comprise fiber cores that are primarily free of twists and are mostly aligned parallel to one another and are surrounded by overlapping, interlocking entanglement of the fibers. Depending on the length of the transport zone between the spinning nozzle and the needle, the twisting of the entangled fibers can be more or less dissipated. The final reinforcement of the fiber combination occurs only by the knitting needles of the knitted kibwear produced. Because of this, the knitting needle of the knitting machine must be positioned as close as possible to the spinning nozzle, or if there is a long transport distance between the spinning nozzle and the knitting needle, a guiding tube must be provided to ensure that the spinning nozzle is moderate. The reinforced fiber combination provides safe and uninterrupted transport.

A similar practice for making soft knitted fabrics without the use of classical yarns is disclosed in document DE 10 2006 037714 A1. In this document, the drawn fiber combination is made in an extension unit and supplied to the knitting needle of the knitting machine by means of one or several vortex devices and at least one active transport element. The proposed vortex device is a spinning tube, each having a pneumatically operated vortex nozzle whereby a false vortex is imparted to the drawn fiber combination which is again dispersed at the knit point. A supply comprising a pair of rollers can be used as an active transport element.

The problem when fabricating knitted fabrics by such drawing and only temporarily reinforced rovings is that, in particular, there is a long transport distance between the vortex device and the spinning nozzle device and the knitting needle of the knitting machine, and the roving reinforcement can be Disperse, whereby the process is interrupted in an undesired manner.

Another practice for making soft knitted fabrics is disclosed in document WO 2009/059438 A1. This document suggests the use of a roving handling device comprising: a spreading device that spreads the roving into a single fiber; and a friction spinning device that is formed as a friction spinning reel to process a single fiber into a stable yarn of desired fineness Good to transport. On a friction spinning reel, the individual fibers of the roving are twisted into a truly stable yarn ready for transport, which is transported to the collection nozzle by withdrawal of the roller pair and further transported to the knitting needle and knitted therefrom Knitted fabric. By withdrawing the formed yarn on the extended friction spinning reel, the yarn is prevented from breaking due to the change in direction.

The document DE 10 2011 053 396 B3 further proposes a device and a method according to the type for increasing the reinforced roving supplied to the knitting machine, wherein the auxiliary yarn and the core yarn supply during the drawing in the stretching unit To roving, thereby forming a so-called core coating with high stability yarn. The auxiliary yarn applied to the supply reel is picked up by the pair of outlet rollers of the stretching unit and combined into a drawn roving. In the document DE 10 2011 053 396 B3, the auxiliary yarn is supplied to the stretching unit by means of a pipe so that the supply of the auxiliary yarn to the stretching unit is not pulled and thus is not damaged.

In order to produce a uniform knitted fabric, it is necessary not only to supply the draw-reinforced roving, but also to use an auxiliary yarn having a constant yarn tension. The yarn tension of the roving can be easily adjusted by the rotational speed of the stretching unit drum and the air pressure on the vortex nozzle or the spinning nozzle. In order to be able to supply the auxiliary yarn or core yarn to the stretching unit with a constant yarn tension, a yarn supply device in the form of a feeder is used in the prior art to assist the yarn supply. The feeder typically includes a winding spool of yarn from which the yarn from the supply spool can be wound. Thereby, the winding yarn is wound on a winding yarn reel transverse to the direction in which the real yarn is conveyed. The feeder is electrically operated by the control device, so that the corresponding feeder is adjusted by the control device, if necessary, the excess yarn can be wound, or the yarn supply stored in the feeder can be Unwrapping and supplying the knit points with the yarn material.

However, due to its mode of operation, the feeder has the disadvantage that the yarn it supplies is continuously under a specific, unconsidered tension. In contrast, the insertion of the auxiliary yarn into the drawn roving (for example as disclosed in document DE 10 2011 053 396 B3) is only reliable if the auxiliary yarn supplied to the stretching unit comprises only a small yarn tension. Work, which cannot be achieved by the feeder or permanently.

The object of the invention is thus to further develop a device and method of the type mentioned at the outset in such a way that at least one auxiliary yarn can be used to form the roving and the soft knitted fabric can be reliably produced.

According to the invention, the object is first solved by a device of the above type, wherein an auxiliary yarn grip roller pair, which rotates in the opposite direction, is provided between the auxiliary yarn supply unit and the stretching unit, which comprises an adjustable rotational speed And the auxiliary yarn is guided between the auxiliary yarn grip rollers.

The auxiliary yarn gripping roller guides the formation of the clamp and is used to assist at least one auxiliary yarn supplied by the yarn supply unit. By providing an auxiliary yarn gripping roller pair comprising an adjustable rotational speed between the auxiliary yarn supply unit and the stretching unit, the auxiliary yarn (which is particularly useful for increasing the stability and increase of the end yarn according to the invention The reliability of the process carried out on the device can be supplied to the stretching unit with different tensions and can be combined into a drawn roving. Due to the difference in rotational speed adjustability and rotational speed between the auxiliary yarn grip rollers, the yarn tension of the auxiliary yarn can be adjusted to a minimum compared to the yarn tension that can be adjusted by known feeders. . This has the advantage that the auxiliary yarn supplied to the stretching unit through the auxiliary yarn gripping roller pair is not tightly stretched, but is slightly skewed or fluttering. Surprisingly, due to the flutter of the auxiliary yarn, the fibers of the roving are particularly well accumulated to the spinning nozzle arrangement in which the stretching unit is arranged. The result is that the tension of the auxiliary yarn actually has an important impact on how many fibers of the roving are themselves wound around the auxiliary yarn. Correct In this case, by adjusting the rotational speed of the auxiliary yarn gripping drum of the auxiliary yarn gripping cylinder, and thus the tension of the auxiliary yarn supplied to the spinning nozzle device, the device according to the invention can be used Significantly affects the softness of the yarn and thus the soft touch of the knitted fabric produced. The more the auxiliary yarn is stretched as it is guided through the spinning nozzle device and thus during the actual attachment of the auxiliary yarn to the roving, the less roving the fibers can wrap around the auxiliary yarn, the resulting yarn and Therefore, the subsequently formed knitted fabric becomes harder. According to this, it is desirable to supply the auxiliary yarn having the yarn tension as small as possible to the roving stretched by the stretching unit.

With respect to the feeder, the auxiliary yarn grips the gripping point between the pair of rollers by the auxiliary yarn and does not wrap itself around them. The axis of rotation of the pair of auxiliary yarn grip rollers is aligned perpendicular to the direction of the auxiliary yarn transport. For this reason, only the auxiliary yarn is clamped, wherein the clamping force can be precisely adjusted by the speed of rotation of the auxiliary yarn gripping roller pair.

The advantage of transporting the auxiliary yarn via the auxiliary yarn gripping roller pair is that the auxiliary yarn can be supplied to the stretching unit with a constant yarn tension, which positively affects the stretch-reinforced roving formed by the auxiliary yarn. And the uniformity of the knitted fabric thus formed by the roving.

In accordance with the present invention, the pair of auxiliary yarn grip rollers includes two auxiliary yarn grip rollers that are pressed or compressible against each other, and their size, dimensions, shape and condition can be selected for the application. One or two auxiliary yarn grip rollers can be driven by the device according to the invention. If only one of the auxiliary yarn gripping rollers is driven, the rotation of the non-driven auxiliary yarn gripping drum is achieved by pressing it against the driven auxiliary yarn gripping roller to make. If the two auxiliary yarns are driven to grip the drum, they can move independently of each other or include a connected or connectable drive.

The auxiliary yarn grip rollers can be pressed against each other permanently. However, it is also possible that the auxiliary yarn grip rollers are not in permanent contact with each other, but can be brought to a position spaced apart from each other, so that it is easy to insert the auxiliary yarn between the auxiliary yarn grip rollers, and the simplification is simplified. Repair and maintenance work on the other auxiliary yarn grip roller pairs.

It has also become advantageous if the auxiliary yarn gripping cylinder(s) are arranged like a device according to the invention, it is possible to replace it/they or at least to replace its drum surface. Thereby, the auxiliary yarn gripping drum can be replaced by the same auxiliary yarn gripping drum or by an auxiliary yarn gripping drum comprising different dimensions and/or different features. Thus, the auxiliary yarn gripping drum can be ideally adjusted for the material used for the auxiliary yarn, for example, and/or the auxiliary yarn gripping drum can be quickly and easily replaced in the event of wear or damage.

In order to be able to supply the rovings gently over a longer distance, in the desired amount and at the desired tension, the device according to the invention may also comprise several successive arrangements in the direction of transport of the auxiliary yarns. The open auxiliary yarn grips the roller pair. The number, form and arrangement of individual pairs of auxiliary yarn gripping rollers can be selected for the application.

In the case of the device according to the invention, it is generally possible to apply the auxiliary yarn before the stretching unit, during the stretching process or directly after the completion of the stretching process (ie between the stretching unit and the spinning nozzle device) The line is supplied to the roving.

In the case where the stretching unit is formed by the pair of individual rollers, which are successively arranged in the conveying direction of the roving, preferably the speed of operation is gradually increased in the conveying direction, the auxiliary yarn can be supplied to the stretching unit. The roving between two successive pairs of rollers (preferably the second to last and the pair of outlet rollers). Preferably, the auxiliary yarn can thereby be ideally received by the pair of outlet rollers and transported along with the roving towards the spinning nozzle device. Furthermore, the rotational speed of the pair of auxiliary yarn grip rollers can ideally be maintained at the rotational speed of the pair of outlet rollers. It has proven to be particularly advantageous if the auxiliary yarn from behind the stretching unit grips the pair of rollers from the outlet of the stretching unit and the yarn is pulled out. By supplying the auxiliary yarn only during the main drawing, it only traverses through a clamping point on the stretching unit and can therefore be combined into a roving without pulling and without damage.

In the present invention, the auxiliary yarn is supplied by a supply reel in the auxiliary yarn supply unit, which is preferably a reel stand. The auxiliary yarn gripping roller pair to which the auxiliary yarn is supplied is preferably disposed close to the stretching unit; however, it may also be arranged at any other point between the stretching unit and the auxiliary yarn supplying unit.

The auxiliary yarn may be a non-elastic yarn or an elastic yarn, wherein the arrangement and/or number and/or size of the at least one auxiliary yarn grip roller pair may vary depending on the elasticity of the auxiliary yarn.

The roving to be drawn by the stretching unit is preferably placed on a so-called wing reel in the form of a non-reinforced fiber combination and pulled out of the reel by the stretching unit. After the roving is stretched in the stretching unit and the auxiliary yarn is supplied, the drawn roving is conveyed by setting the roving The spinning nozzle device, which is oriented downstream of the stretching unit, is reinforced into a drawn, reinforced roving and is connected to the auxiliary yarn. Preferably, the auxiliary yarn is preferably centrally bonded to the draw-reinforced roving; however, it can also be positioned in the peripheral region of the drawn roving.

Thereby, it is especially preferred to form the device according to the invention such that the spinning nozzle device comprises two successively arranged, pneumatically operated spinning nozzles having opposite directions of rotation in the direction of roving transport. The spinning nozzle device is thus preferably composed of two air vortex nozzles which produce an air flow comprising opposite directions of rotation. The spinning nozzles arranged in the transport direction in the second direction are preferably vortex nozzles which produce so-called dummy strands from the fibrous material comprising the supply of auxiliary yarns. The spinning nozzles (injection nozzles) arranged in front of the vortex nozzles unwind the fiber material due to the opposite direction of rotation, thereby causing the support of the edge fibers, which are wound around the fiber core and assisted by the rotation of the vortex nozzles. Around the yarn.

According to the present invention, the rotational strength and/or pressure of the air exiting the spinning nozzle can be individually adjusted, whereby the characteristics of the drawn reinforcing roving having the integrated auxiliary yarn can be ideally influenced, and the spinning speed of the spinning nozzle It can be adjusted to the knitting speed of the knitting machine disposed downstream of the drawing and strengthening unit.

In order to further enhance the strength of the draw-strength roving incorporating the auxiliary yarn, and to avoid dissociation of the draw-reinforced roving from the combined auxiliary yarn during transport to the knitting machine, the device according to the invention comprises in the opposite direction The rotating end yarn grips the roller pair, which is placed in the roving transport direction downstream of the spinning nozzle device, and is limited to fiber reinforcement Section. The end yarn gripping drum pair forms a clamp feedthrough for exiting the spinning nozzle device to include a draw reinforced roving of the auxiliary yarn. The end yarn gripping drum pair is then supplied to a knitting machine provided for drawing reinforcement rovings comprising auxiliary yarns.

The end yarn gripping drum pair forms a gripping point for the draw reinforced roving comprising the auxiliary yarn, which is limited to the fiber reinforced section of the spinning nozzle device. In the device according to the invention, the pair of end yarn gripping rollers can be arranged to have a relatively small distance from the spinning nozzle device, and the distance of the end yarn gripping roller to the knitting needles of the knitting machine can be included Larger distances and thus practically useful metrics.

By gripping the pair of rollers by the end yarns, the technical system of the drawing and roving reinforcement can be decoupled from the technical system of the yarn supply of the knitting machine, wherein the clamping jaws are gripped by the end yarns. The point blocks the upstream spinning nozzle device from forming false strands. This means that the end yarn gripping roller pair determines a rotational end produced by the spinning nozzle device and thus determines one end of the dummy strand; thereby exiting the end yarn gripping roller pair and including the auxiliary yarn The pull-strengthened end yarn maintains its strength and can avoid dissociation of the end yarn. Accordingly, the transport path of the end yarns can be achieved over a relatively long distance.

The arrangement of the end yarn grip roller pairs can occur for the application. However, it has proven to be particularly suitable if at least one of the two end yarn gripping rollers is driven, wherein the second end yarn gripping drum does not comprise a separate drive and is pressed against it by driving it The end yarn grips the drum and moves.

In a particularly preferred embodiment of the device according to the invention, the rotational speed of the at least one auxiliary yarn gripping drum is adjustable by means of the device controller, whereby the rotational speed of the stretching drum of the stretching unit is also adjustable . The shared device controller enables continuous, coordinated transport of the roving and auxiliary yarns through the device according to the invention, thus ensuring consistent product quality of the end yarns. Moreover, due to such shared device controllers, the programming and control of the device according to the present invention is reduced, wherein the cost of the device can be kept low.

In the device according to the invention, at least one of the two auxiliary yarn gripping drums is drivable, wherein the rotational speed of the at least one auxiliary yarn gripping drum can be controlled by the device controller according to operating conditions Adjustment and control. Thereby, the second auxiliary yarn gripping drum of the pair of auxiliary yarn gripping rollers is preferably driven by pressing it against the driven auxiliary yarn gripping drum; however, an alternative implementation of the invention is implemented For example, it can also be driven by the device controller, which also drives at least one other auxiliary yarn gripping drum and stretching drum.

In a further embodiment of the invention, at least one of the ends of the end yarn gripping drum pair can also be driven to be speed controlled by a device controller that is not the auxiliary yarn gripping roller pair and the stretching drum, whereby the basis can be further reduced The operation and cost of the apparatus of the present invention.

In a further preferred embodiment of the device according to the invention, the auxiliary yarn gripping drum comprises a first, contoured auxiliary yarn gripping drum and a second, rubberized auxiliary yarn gripping drum, whereby the auxiliary yarn Can be transported reliably without slipping from the auxiliary yarn gripping roller or blocking or stopping at the auxiliary The yarn helps the yarn to grip between the rollers.

It is particularly preferred if the auxiliary yarn oscillating means is arranged in the roving direction of the apparatus before the at least one auxiliary yarn grips the pair of rollers, whereby the time between the auxiliary yarn gripping cylinders is variable The yarn advances. Since the assembly of the device according to the invention, in particular the auxiliary yarn gripping drum, is exposed to high strain during the roving treatment due to the high manufacturing speed, the efficiency of the device can be increased by such an auxiliary yarn oscillating device. By means of the auxiliary yarn oscillating device, it is thereby ensured that the auxiliary yarn does not constantly contact the same contact surface on the auxiliary yarn gripping cylinder. It is thus possible to avoid shrinkage of the auxiliary yarn gripping drum used. Preferably, a defined oscillating path is provided for this purpose in order to ensure a safe guiding of the auxiliary yarn. Depending on the axial length of the auxiliary yarn gripping drum, the oscillation path should be specially selected and adjusted.

In order to ensure that the auxiliary yarn is supplied to the stretching unit and without increasing the set yarn tension of the auxiliary yarn gripping drum, in a suitable embodiment of the apparatus according to the invention, at least one optical yarn sensor is arranged in the auxiliary yarn The conveying direction is downstream of the auxiliary yarn gripping roller pair, whereby the auxiliary yarn can be optically recorded.

In a preferred embodiment of the invention, the auxiliary yarn supply unit includes a closure casing having an opening to allow the auxiliary yarn to exit. The cover particularly protects the auxiliary yarn, the reel carrying the auxiliary yarn, the element of the auxiliary yarn supply unit required to transport the auxiliary yarn from the wing fiber, which is passed through the roving in the stretching unit and the spinning nozzle Specially produced by processing in the device. The cover thus ensures a safe process. Can choose the shell for the application The construction form and material selection of the hood.

The object of the invention is further solved by a method of the above type, wherein the auxiliary yarn is guided to the auxiliary yarn supply unit and the stretching unit via an auxiliary yarn gripping roller pair that is variable in rotational speed and rotates in the opposite direction. between.

The method according to the invention makes it possible to integrate at least one auxiliary yarn into the roving in particular in order to be able to produce an end yarn, which on the one hand is used to form a knitted fabric having a very soft touch and on the other hand is extremely strong in itself. .

In the method according to the invention, the auxiliary yarn which increases the strength of the end yarn is guided between at least one pair of auxiliary yarn gripping drums whose rotational speed is variable, which is rotated in the opposite direction towards the stretching unit. In particular, by adjusting the rotational speed of the at least one auxiliary yarn gripping drum, the speed and tension of the auxiliary yarn transported to the roving can be controlled, whereby the characteristics of the end yarn and the process conditions can be affected. Furthermore, by the auxiliary yarn gripping the roller pair and transporting the auxiliary yarn from the auxiliary yarn supply unit to the stretching unit, the auxiliary yarn can be supplied to the stretching unit with a constant yarn tension as required, whereby A treated roving of constant quality is produced which in turn results in a consistently good knitting result on the knitting machine. By gripping the pair of rollers with the auxiliary yarns used, the auxiliary yarns supplied to the stretching unit can produce a relatively small yarn tension, which is not possible with the feeder at the scale according to the invention. Since the auxiliary yarn used grips the roller pair, it is also possible to prevent the auxiliary yarn from being torn by gravity or too high tension, for example.

The auxiliary yarn gripping roller pair thus forms an auxiliary yarn supply shaft for the stretching unit, by which the tension of the supplied auxiliary yarn and core yarn is adjusted. By adjusting the appropriate rotational speed setting of the auxiliary yarn gripping drum, the yarn tension of the auxiliary yarn is adjusted as small as possible, in particular because the auxiliary yarn does not stretch during supply to the stretching unit and is accumulated later. The roving fibers around the auxiliary yarn are not compressed during the "relaxing" of the auxiliary yarn.

In this way, it is possible for the auxiliary yarn to be guided over an extremely long transport path by gripping the roller pair by more than one auxiliary yarn, in order to be able to better adjust the tension of the auxiliary yarn and to prevent the auxiliary yarn from tearing during transport. crack.

According to the invention, the auxiliary yarn is removed from the auxiliary yarn supply unit by means of a reel, for example, and supplied to the roving drawn in the stretching unit. Here, the auxiliary yarn can be supplied to the roving before the stretching process, during the stretching process or directly after the completion of the stretching process. In particular, if the auxiliary yarn is supplied to the roving only towards the end of the stretching process, it can be ensured that the auxiliary yarn is supplied at a desired tension to the spinning process after the stretching process. In particular, by the tension of the auxiliary yarn across the spinning process, the quality and softness of the end yarn can be significantly affected, since this is the auxiliary yarn tension, how many roving fibers are entangled in the auxiliary yarn, and the roving fibers. How to maintain the decision on the auxiliary yarn. Therefore, the auxiliary yarn should include as little yarn tension as possible when traversing the spinning process in order to produce a soft end yarn.

In a particularly preferred embodiment of the method according to the invention, the two spinning nozzles of the spinning nozzle device for reinforcing the roving of the auxiliary yarn are Pneumatic work and application of compressed air in individual opposite directions of rotation to the drawn roving leaving the stretching unit. By adjusting the rotational strength and/or pressure of the compressed air exiting the spinning nozzle of the spinning nozzle device, the tension conditions of the drawn reinforced roving are at the spinning nozzle device and the end yarns successively arranged in the roving conveying direction. Grab the area between the pair of rollers to make adjustments. It is therefore possible to ideally adjust the quality and in particular the strength of the end-drawn yarns of the pull-out reinforcing yarns comprising the auxiliary yarns leaving the pair of gripping rollers, thereby ensuring a smooth process sequence and producing high-quality knitting on the knitting machine. cloth.

According to the invention, the jaws of the end yarns are arranged downstream of the strengthening process with the spinning nozzle arrangement, whereby the rovings comprising the end-strength yarns are clamped and guided through the end yarns which are rotated in opposite directions. The pair of rollers are grasped and the end yarn leaving the pair of end yarn gripping rollers is supplied to the knitting machine. By the end yarn gripping the drum and the tongs leaving the spinning nozzle device to include the roving of the auxiliary yarn, the formation of the false strands caused by the spinning nozzle device ends, whereby the subsequent twisting of the end yarn can be avoided. According to this, the end yarn can also be transported to the knitting needle of the knitting machine with a constant quality over a long distance.

In order to ensure that the end yarns are transported to the knitting needles of the knitting machine without any effort, it has proven to be particularly preferred if at least one of the two end yarn gripping drums is driven. Here, another non-driven end yarn gripping drum is preferably rotated by pressing it against the driven gripping drum. However, in an alternative embodiment, it is also possible to drive two end yarn gripping drums simultaneously, wherein they are driven or coupled independently of each other. Put together to drive.

It is particularly suitable to form the method according to the invention in such a way that the adjustment of the rotational speed of the auxiliary yarn gripping drum of the auxiliary yarn gripping cylinder is such that the yarn exiting the auxiliary yarn of the auxiliary yarn gripping roller pair The tension is less than 2 minutes Newtons (cN). If the auxiliary yarn is supplied to the spinning nozzle device and the auxiliary yarn thereby entangles the fibers of the roving, in this small tension, in particular, a plurality of fibers can entangle the auxiliary yarn, whereby the knitting machine can be fabricated. Soft end yarns and therefore a soft knit cloth.

In an alternative embodiment of the method according to the invention, it is of course also possible to carry out a yarn tension of more than 2 minutes Newton when the auxiliary yarn is pulled away from the auxiliary yarn gripping roller pair; however, this can no longer be produced here. Soft yarn, because the roving fibers are entangled with the auxiliary yarn much less than the yarn tension is less than 2 minutes Newton. Preferably, the auxiliary yarn is supplied to the stretching unit at a yarn tension of less than 2 minutes Newton, preferring a yarn tension of less than 1 minute Newton, and particularly preferably a yarn tension of less than 0.5 Newton.

In a particularly suitable version of the method according to the invention, the auxiliary yarn is supplied to the auxiliary yarn grip roller pair, which oscillates in the axial direction of the auxiliary yarn grip roller, and the grip roller is assisted by the auxiliary yarn and the auxiliary yarn. A constant contact occurs between the high strains, whereby the auxiliary yarn gripping drum can be prevented from contracting. It is particularly preferred if the auxiliary yarn can oscillate over the entire axial length of the auxiliary yarn gripping drum; however, only an auxiliary yarn of a firm path can be achieved on the auxiliary yarn gripping cylinder so far. line.

Furthermore, if the auxiliary yarn tension between the auxiliary yarn gripping roller pair and the stretching unit is optically recorded, it has proven to be advantageous for safely supplying the auxiliary yarn with as little tension as possible.

1‧‧‧ device

10‧‧‧Transport shaft

2‧‧‧Knitting machine

3‧‧‧Extraction and reinforcement unit

4‧‧‧roving supply unit

40a‧‧‧roving

40b‧‧‧ pulled roving

40c‧‧‧Stretched roving

40d‧‧‧End yarn

5‧‧‧Auxiliary yarn supply unit

50‧‧‧Auxiliary yarn

51‧‧‧Auxiliary yarn grip roller pair

51a‧‧‧First auxiliary yarn grip roller

51b‧‧‧Second auxiliary yarn gripping roller

52‧‧‧Supply reel

53, 53'‧‧‧Auxiliary yarn transport tube

54‧‧‧Compression device

55‧‧‧Steering device

56‧‧‧Auxiliary yarn guiding device

57‧‧‧Auxiliary yarn oscillating device

6‧‧‧Extension unit

60a‧‧‧ lower roller

60b‧‧‧Upper roller

601‧‧‧ entrance roller pair

602‧‧‧Intermediate roller pair

603‧‧‧Exit roller pair

61‧‧‧Extension unit pressure arm

7‧‧‧Fiber strengthening section

70‧‧‧Spinning nozzle device

70a‧‧‧First air torsion nozzle

70b‧‧‧second air torsion nozzle

71‧‧‧End yarn grip roller pair

71a‧‧‧Drive grip roller

71b‧‧‧Non-drive grip roller

8‧‧‧Shell cover

81‧‧‧ openings

9‧‧‧wing spindle reel

90‧‧‧ device controller

A‧‧‧ roving transport direction

B‧‧‧Auxiliary yarn transport direction

C, C’‧‧‧ Rotary movement

D‧‧‧ oscillation direction

The preferred embodiments of the present invention, including its structure, function and advantages, are explained in more detail below, in which: FIG. 1 is a side view schematically showing an embodiment of a device according to the invention; FIG. 2 is a side view A pair of auxiliary yarn grip rollers showing an embodiment of the apparatus according to the present invention; and a front view of Fig. 3 schematically showing the pair of auxiliary yarn grip rollers of Fig. 2.

Figure 1 shows in a side view an embodiment of a device 1 according to the invention. With the exception of the auxiliary yarn supply, the device shown corresponds to the device described in the document DE 10 2011 053 396 B3, the entire contents of which are hereby incorporated by reference.

The apparatus 1 comprises a drawing and strengthening unit 3 which processes the rovings 40a in forming the end yarns 40d. The drawing and reinforcing unit 3 is coupled to the knitting machine 2 to form a knitted fabric from the end yarn 40d on the knitting machine 2. Although described as the end "thread", attention should be paid to the end yarn 40d. Rather than a conventional yarn, but a drawn, temporarily reinforced roving comprising at least one auxiliary yarn 50, as described in more detail below.

The drawing and reinforcing unit 3 comprises a roving supply unit 4 (having at least one roving 40a) and an auxiliary yarn supply unit 5 (having at least one auxiliary yarn 50).

The roving supply unit 4 supplies the unreinforced roving 40a to the drawing and strengthening unit 3, which is disposed on the wing reel 9 covered by the roving supply unit 4. As shown in Fig. 1, the rovings 40a are preferably supplied to the drawing and reinforcing unit 3 in the roving conveying direction A via the transport shaft 10. In an alternative embodiment of the device 1 according to the invention, the rovings 40a can also be supplied to the drawing and strengthening unit 3 by means of several or no transport axles 10 located between the drawing and strengthening unit 3 and the roving supply unit 4. .

The drawing and reinforcing unit 3 further comprises an stretching unit 6 and a spinning nozzle device 70 disposed downstream of the stretching unit 6 in the roving conveying direction A. The stretching unit 6 illustrated in Fig. 1 includes an extension roller pair 601, 602, 603 which is successively arranged in the roving conveying direction A of the roving 40a, particularly the inlet roller pair 601, the intermediate roller pair 602, and the outlet roller pair 603. In other embodiments of the device 1 according to the invention, the stretching unit 6 may also comprise more than one intermediate roller pair 602 or no intermediate roller pair 602 at all.

For drawing and thus to homogenize the rovings 40a, the rovings 40a are guided between the stretching rolls 60a and 60b of the individual stretching drum pairs 601, 602, 603. The roving 40a is pumped by driving the stretching roller pair 601, 602, 603 by the speed of change in the roving conveying direction A. Pulled into the drawn roving 40b. The pair of stretching rollers 601, 602, 603 are driven at such speeds that the outlet roller pair 603 includes a higher speed than the intermediate roller pair 602, and the intermediate roller pair 602 in turn includes a higher speed than the inlet roller pair 601. Thus, pre-pull occurs between the inlet roller pair 601 and the intermediate roller pair 602, while subsequent major drawing of the roving 40a is achieved between the intermediate roller pair 602 and the outlet roller pair 603.

In order to produce the drawing of the rovings 40a, the rovings 40a must be transported in a clamped manner between the stretching rolls of the pair of stretching rolls 601, 602, 603. This preferably occurs by pressing the non-driven stretching drum (upper drum 60b) to the driven stretching drum (lower drum 60a), respectively. In order to press the upper roller 60b to the lower roller 60a, the upper roller 60b is coupled to the L-shaped extension unit pressure arm 61. Accordingly, the non-driven stretching roller 60b can be easily pressed together against the driven stretching roller 60a, or can be removed from the stretching roller 60a by swinging the stretching unit pressure arm 61. The extension unit pressure arm 61 can be moved mechanically, pneumatically or hydraulically.

In order to increase the strength of the drawn rovings 40b and to increase the reliability of the process performed on the apparatus 1, at least one auxiliary yarn 50 is supplied to the rovings 40a in accordance with the present invention. The auxiliary yarn 50 is provided by an auxiliary yarn supply unit 5, which typically includes several supply spools 52.

In the illustrated embodiment, the auxiliary yarn supply unit 5 includes a casing 8 that surrounds a supply spool 52 that stores at least one auxiliary yarn 50. The casing 8 of the auxiliary yarn supply unit 5 includes at least one opening 81 through which the auxiliary yarn 50 can be supplied to at least the auxiliary yarn conveying direction B of the auxiliary yarn 50 and downstream of the auxiliary yarn supplying unit 5 One The auxiliary yarn grips the roller pair 51. In an alternative embodiment of the device 1 according to the invention, the casing 8 may also comprise several openings 81 through which several auxiliary yarns 50 may be led out of the casing without entanglement.

By gripping the roller pair 51 by the auxiliary yarn, the auxiliary yarn 50, which is removed from the spool 52 and guided through the opening 81 of the casing 8 of the auxiliary yarn supply unit 5, is carefully supplied with the desired yarn tension. To the drawn and partially drawn roving 40b.

In the embodiment shown in Fig. 1, the supply of the auxiliary yam 50 to the drawn roving 40b occurs during the drawing of the roving 40a in the stretching unit 6. In this process, the auxiliary yarn 50 is particularly preferably supplied between the intermediate roller pair 602 and the outlet roller pair 603 to the stretching unit 6, and thus to the roving 40b. Preferably, the auxiliary yarn 50 is thereby removed by the pair of outlet rollers 603, and along with the drawn and partially drawn rovings 40b, toward the spinning nozzle assembly 70 disposed downstream of the stretching unit in the roving transport direction A. Come and ship. The rotational speed of the auxiliary yarn grip roller pair 51 can thus be ideally adjusted to the rotational speed of the outlet roller pair 603.

In other embodiments not shown of the device 1 according to the invention, the auxiliary yarn 50 can be supplied to the roving 4a which has not yet been pulled before crossing the stretching unit 6, or only after leaving the stretching unit 6 Roving 40b.

By adjusting the tension of the auxiliary yarn 50 by the auxiliary yarn gripping roller pair 51 (also supplied to the stretching unit 6), it is possible to significantly affect the softness of the manufactured end yarn 40d and the knitted fabric produced thereby. Because the yarn tension of the auxiliary yarn 50 is particularly related to the drawn roving 40b How many fibers are entangled and adhered to the auxiliary yarn 50 in and after the spinning nozzle device 70. In the embodiment of Figure 1, the auxiliary yarn 50 is supplied to the stretching unit 6 at a yarn tension of less than 2 minutes Newton, since the drawn roving 40b has a particularly large number of auxiliary yarns in which the fibers themselves are wound around such small yarn tension. Around the line 50, the end yarns 40d and thus the knitted fabric also produce a particularly high degree of softness.

Moreover, since the auxiliary yarn 50 is transported with a small tension by the auxiliary yarn gripping roller pair 51, the auxiliary yarn 50 can be prevented from tearing and thus avoiding an undesired process interruption.

In the embodiment illustrated in Figure 1, the apparatus according to the invention comprises only an auxiliary yarn roller pair 51, however in a further embodiment it may also comprise several auxiliary yarn roller pairs 51 which are successively arranged in the auxiliary yarn. Shipping direction B. In particular with the aid of the auxiliary yarn 50 from the auxiliary yarn supply unit 5 for a long transport distance to the stretching unit 6, it has proven to be advantageous to use several auxiliary yarns in the device 1 to grip the roller pair 51.

The drawing roving 40a leaving the stretching unit 6 is supplied to the spinning nozzle device 70 together with at least one supply auxiliary yarn 50, which is disposed in the roving conveying direction A and downstream of the stretching unit 6. In the spinning nozzle device 70, the drawing roving 40b including the auxiliary yarn 50 is rotated by the jet air leaving the spinning nozzle device 70, thus forming a so-called dummy strand.

In the embodiment of Fig. 1, the spinning nozzle device 70 includes two air twist nozzles 70a, 70b which are successively arranged in the roving transport direction A. The air flow generated by the two air torsion nozzles 70a, 70b includes the opposite rotation Turn direction. The first air twist nozzle 70a (so-called injection nozzle) disposed downstream of the stretching unit 6 unwinds the fiber material of the drawn roving 40b, whereby the peripheral fibers on the drawn roving 40b are dispersed. By the rotation generated by the second air twisting nozzle 70b (so-called vortex nozzle) disposed downstream of the first air twisting nozzle 70a, the scattered peripheral fibers are wound around the fiber core of the roving 40a and/or the auxiliary yarn 50, This formed a fake stock. The rotational speed of the air twist nozzles 70a, 70b and the air flow generated by the individual air twist nozzles 70a, 70b can be selected in accordance with the adjustable knitting speed and roving transport speed on the knitting machine 2. Furthermore, the distance between the spinning nozzle device 70 and the stretching unit 6 and the distance between the air torsional nozzles 70a, 70b can be selected for the application.

The roving 40b drawn by the stretching unit 6 (which includes at least one auxiliary yarn 50 and reinforced in the spinning nozzle device 70) is end yarn which is disposed downstream of the spinning nozzle device 70 in the transport direction A of the roving 40a. The grip roller pair 71 is removed. The end yarn grip roller pair 71 typically has a non-driven grip roller 71b that drives the grip roller 71a and presses against the drive grip roller 71a. In an alternative embodiment of the device 1 according to the invention, the end yarn grip roller pair 71 may also comprise two drive grip rollers 71a that are pressed against each other. The end yarn grip roller pair 71 enables speed decoupling of the technical system of the draw and strengthen unit 3 from the technical system for yarn supply to the knitting machine 2. Furthermore, the clamping point achieved by the end yarn gripping roller pair 71 enables the drawn reinforcing rovings 40c, which exit the end yarn gripping drum pair 71 and including the auxiliary yarn 50, to be diverted to the operating height of the knitting machine 2.

Figure 2 shows in a side view an auxiliary yarn grip roller pair 51 according to an embodiment of the device 1 of the invention. The elements referred to in FIG. 2 by the same reference numerals as in FIG. 1 correspond to the elements of FIG. 1, and therefore reference is made to the above description of these elements.

In the embodiment shown in Fig. 2, the auxiliary yarns 50 stored in the auxiliary yarn supply unit 5 are supplied to the auxiliary yarn gripping roller pair 51 by the auxiliary yarn carrying tube 53, whereby the auxiliary yarn can be largely excluded Line 50 is destroyed during transportation. The form, location and dimensions of the auxiliary yarn transport tube 53 can thus be selected for the application.

The auxiliary yarn 50 leaving the auxiliary yarn conveying pipe 53 is guided through the auxiliary yarn conveying pipe 53 and the auxiliary yarn before being supplied to the auxiliary yarn holding roller pair 51 disposed downstream of the auxiliary conveying direction B. The wire grips the auxiliary yarn guiding device 56 between the pair of rollers 51. The auxiliary yarn guiding device 56 is part of the auxiliary yarn oscillating device 57 via which the auxiliary yarn 50 is moved laterally perpendicularly to the auxiliary yarn transport direction B, resulting in the auxiliary yarn 50 not being in constant contact with the auxiliary yarn. The auxiliary yarn holding the pair of rollers 51 grips the same contact surface of the rollers 51a, 51b. Therefore, the auxiliary grip rollers 51a, 51b used can be prevented from contracting.

As shown in Figure 2, the auxiliary yarn grip roller pair 51 preferably includes two opposing auxiliary yarn grip rollers 51a, 51b that operate in opposite directions and are pressed against each other. In the embodiment shown, the first of the two auxiliary yarn grip rollers 51a is fixed in the device 1, and the second auxiliary yarn grip roller 51b is arranged in the manner provided in the device 1 according to the invention. It can be pressed against and disengaged from the first auxiliary yarn that is placed in a fixed position. The roller 51a is gripped. According to the embodiment of Fig. 2, for example, a spring-activated compression device 54 can be used for this purpose, by which the second auxiliary yarn gripping drum 51b can be pressed against the first auxiliary yarn gripping roller 51a. In an alternative embodiment of the device 1 according to the invention, the compression device 54 can however also take different forms and can be hydraulically and pneumatically positioned in addition to mechanical operation.

The size, dimensions, form and texture of the auxiliary yarn grip rollers 51a, 51b can be selected for the application. In the illustrated embodiment, the first auxiliary yarn gripping drum is contoured and the second auxiliary yarn gripping drum 51b is rubberized. The auxiliary yarn gripping rollers 51a, 51b of this type prevent the auxiliary yarn 50 from slipping out of the space between the auxiliary yarn gripping rollers 51a, 51b, and can also transport the auxiliary yarn 50 gently. The second auxiliary yarn gripping drum 51b may be formed entirely of rubber or may include only a rubber coating. Depending on the operating conditions of the auxiliary yarn grip roller 51a, the contour and material of the contoured auxiliary yarn grip roller 51a can be freely selected. Thus, for example, it is possible to contour assist. The yarn grip roller 51a comprises a sawtooth pattern or groove provided with respect to the auxiliary yarn transport direction B.

In the embodiment shown in Fig. 2, the first auxiliary yarn gripping drum 51a is driven, wherein its rotation is transmitted to the non-driven second auxiliary yarn gripping drum 51b. Accordingly, the auxiliary yarn grip rollers 51a, 51b perform relative rotational movements C, C'. However, in a further embodiment of the device 1 according to the invention, both auxiliary yarn gripping rollers 51a, 51b can be driven, wherein they can be driven independently of one another or connected to each other or can be connected to each other. The only important thing here is the two auxiliary yarn grip rollers. 51a, 51b are driven in opposite rotational directions.

In the embodiment of Fig. 2, the steering device 55 is disposed downstream of the pair of auxiliary yarn grip rollers 51, and the auxiliary yarns 50 are directed toward the stretching unit 6. The steering device 55 avoids too sudden steering and thus avoids damage to the auxiliary yarn 50, whereby the process safety of the device 1 according to the invention can be increased. In the illustrated embodiment, the steering device 55 is further formed as an optical fiber sensor for ensuring that the auxiliary yarn 50 is present after the auxiliary yarn grips the roller pair 51. The detection of the auxiliary yarn occurs at this point optically rather than mechanically so that the tension of the yarn tension of the auxiliary yarn 50 is no longer increased after the auxiliary yarn 50 traverses the auxiliary yarn gripping roller pair 51. degree.

In the illustrated embodiment, the auxiliary yarn 50 that is deflected by the steering device 55 away from the auxiliary yarn gripping roller pair 51 is transported therefrom to the stretching unit 6 or spinning via another auxiliary yarn transport tube 53'. The nozzle device 70, whereby the auxiliary yarn 50 can be transported in a particularly gentle and process-stable manner.

Fig. 3 is a front view schematically showing the auxiliary yarn gripping roller pair 51 shown in Fig. 2, wherein the same reference numerals as in the previous figures also refer to the same elements, so that reference is also made to the previous embodiment.

Figure 3 shows that the auxiliary yarn 50 is guided through the auxiliary yarn carrying tube 53, the auxiliary yarn grasping rolls 51a, 51b and the steering device 55 into the auxiliary yarn carrying tube 53'.

Again, it is also apparent from Figure 3 how the auxiliary yarn 50 passes through the auxiliary yarn oscillating means 57 including the auxiliary yarn guiding means 56. borrow By moving the auxiliary yarn oscillating device 57 in the oscillating direction D transverse to the auxiliary yarn transport direction B, the contact surface of the auxiliary yarn 50 with the surface of the auxiliary yarn grip rollers 51a, 51b may be varied, whereby It is possible to prevent the auxiliary yarn grip rollers 51a, 51b from contracting and to avoid an increase in wear. In particular, with regard to the movement of the auxiliary yarn 50 along the surface of the auxiliary yarn gripping drums 51a, 51b, the auxiliary yarn guiding device 56 of the auxiliary yarn oscillating device 57 guides the auxiliary yarn 50 to prove that It is particularly preferred because the auxiliary yarn oscillating means 57, by means of the auxiliary yarn oscillating means 57, can therefore be controlled to move without shifting.

The rotational speed of the auxiliary yarn grip rollers 51a, 51b and/or the movement of the auxiliary yarn 50 by the auxiliary yarn oscillating means 57 can be adjusted by the device controller 90. By means of the device controller 90, the rotational speed of the end yarn grip roller pair 71 and/or the pressure of the compressed air exiting the spinning nozzles 70a, 70b and/or the drum rotation speed of the stretching unit 6 and/or The knitting speed of the knitting machine 2.

In the simplest embodiment, the auxiliary yarn guiding device 56 is formed as a drill in the auxiliary yarn oscillating device 57, which is formed, for example, as a shaft; however, in other embodiments of the device 1 according to the invention, It can also be made in different forms.

A‧‧‧ roving transport direction

B‧‧‧Auxiliary yarn transport direction

C, C’‧‧‧ Rotary movement

1‧‧‧ device

2‧‧‧Knitting machine

3‧‧‧Extraction and reinforcement unit

4‧‧‧roving supply unit

5‧‧‧Auxiliary yarn supply unit

6‧‧‧Extension unit

7‧‧‧Fiber strengthening section

8‧‧‧Shell cover

9‧‧‧wing spindle reel

10‧‧‧Transport shaft

40a‧‧‧roving

40b‧‧‧ pulled roving

40c‧‧‧Stretched roving

40d‧‧‧End yarn

50‧‧‧Auxiliary yarn

51‧‧‧Auxiliary yarn grip roller pair

51a‧‧‧First auxiliary yarn grip roller

51b‧‧‧Second auxiliary yarn gripping roller

52‧‧‧Supply reel

53'‧‧‧Auxiliary yarn transport tube

55‧‧‧Steering device

60a‧‧‧ lower roller

60b‧‧‧Upper roller

61‧‧‧Extension unit pressure arm

70‧‧‧Spinning nozzle device

70a‧‧‧First air torsion nozzle

70b‧‧‧second air torsion nozzle

71‧‧‧End yarn grip roller pair

71a‧‧‧Drive grip roller

71b‧‧‧Non-drive grip roller

81‧‧‧ openings

90‧‧‧ device controller

601‧‧‧ entrance roller pair

602‧‧‧Intermediate roller pair

603‧‧‧Exit roller pair

Claims (10)

A device (1) for manufacturing a knitted fabric by a knitting machine (2) and a drawing and reinforcing unit (3), comprising: a roving supply unit (4) having at least one roving (40a); an auxiliary yarn supply unit ( 5) having at least one auxiliary yarn (50); an stretching unit (6) coupled to the roving supply unit (4) supplying the roving (40a) and the auxiliary yarn supplying the auxiliary yarn (50) a wire supply unit (5); a spinning nozzle device (70) disposed in the roving conveying direction (A) of the device (1) downstream of the stretching unit (6), and forming fibers by applying compressed air a reinforcing section (7); and an end yarn gripping roller pair (71) rotating in the opposite direction, which is disposed in the roving conveying direction (A) downstream of the spinning nozzle device (70) Reducing the fiber-reinforced section (7), the apparatus is characterized in that at least one auxiliary yarn gripping roller that rotates in the opposite direction is disposed between the auxiliary yarn supply unit (5) and the stretching unit (6) Pair (51), which includes an adjustable rotational speed, and the auxiliary yarn (50) is guided between the auxiliary yarn grip rollers (51a, 51b). The device of claim 1, wherein the rotational speed of at least one of the auxiliary yarn gripping rollers (51a, 51b) is adjustable by the device controller, whereby the stretching can also be adjusted The rotational speed of the stretching drum (60a, 60b) of the unit (6). The device of claim 1, wherein the auxiliary yarn gripping drum (51a, 51b) comprises a first, contoured auxiliary yarn grip The drum (51a) and the second, rubberized auxiliary yarn grip the drum (51b). The device according to claim 1, wherein the auxiliary yarn oscillating device (57) is disposed in the roving conveying direction of the device (1) before the at least one auxiliary yarn gripping the roller pair (51). The device according to claim 1, wherein at least one optical yarn sensor (55) is disposed in the auxiliary yarn conveying direction (B) downstream of the auxiliary yarn holding roller pair (51). The device according to any one of claims 1 to 5, wherein the auxiliary yarn supply unit (5) comprises a closure casing (8) having at least one opening (81) for the auxiliary yarn (50) )go away. A method of manufacturing a knitted fabric, wherein at least one roving (40a) supplied by the roving supply unit (4) and at least one auxiliary yarn (50) supplied from the auxiliary yarn supply unit (5) are supplied to the stretching unit (6) The compressed air is applied to the drawn roving (40b) leaving the stretching unit (6) and including the auxiliary yarn (50) by a spinning nozzle device (70) in the fiber reinforced section (7), It is thus reinforced, wherein the fiber-reinforced section (7) is confined by an end yarn gripping roller pair (71) that rotates in the opposite direction, including the pull-strength of the auxiliary yarn (50) The roving (40c) is then guided through the pair of end yarn gripping rollers in a clamped manner, and the end yarn (40d) exiting the end yarn gripping roller pair (71) is supplied to the knitting machine (2), The method is characterized in that the auxiliary yarn (50) is guided through the auxiliary yarn supply unit (5) and the stretch by at least one auxiliary yarn that is rotated in the opposite direction to grip the roller pair (51) Between units (6), the The auxiliary yarn grip roller pair includes an adjustable rotational speed, the auxiliary yarn grip roller pair (51) including an auxiliary yarn grip roller (51a, 51b). The method of claim 7, wherein the rotation speed of the auxiliary yarn gripping drum (51a, 51b) of the auxiliary yarn gripping roller pair (51) is adjusted in such a manner as to leave the auxiliary yarn The yarn tension of the auxiliary yarn (50) of the grip roller pair (51) is less than 2 minutes Newtons (cN). The method of claim 7, wherein the auxiliary yarn (50) is supplied to the auxiliary yarn grip roller pair (51) oscillating in the axial direction of the auxiliary yarn gripping drum (51a, 51b). The method of any one of clauses 7 to 9, wherein the auxiliary yarn (50) is optically recorded between the auxiliary yarn grip roller pair (51) and the stretching unit (6) Line tension.