EP3645774A1

EP3645774A1 - Apparatus and method for presenting threads and textile machine

Info

Publication number: EP3645774A1
Application number: EP18731434.9A
Authority: EP
Inventors: Marcus Weber
Original assignee: Hochschule Niederrhein
Current assignee: Hochschule Niederrhein
Priority date: 2017-06-26
Filing date: 2018-06-13
Publication date: 2020-05-06
Anticipated expiration: 2038-06-13
Also published as: EP3645774B1; DE102017114133A1; WO2019001969A1; CN110770379A; CN110770379B; US20200109498A1

Abstract

The invention relates to an apparatus for presenting threads for loop-forming tools, arranged in at least one row, of a textile machine having a thread guide apparatus having at least one rotary element (4, 5, 20, 21, 30, 31, 40, 41) having at least one thread guide (20a, 20b, 21a, 21b, 30a, 30b, 40a, 40b), said thread guide apparatus being configured to lay a thread back and forth in two directions (HI, HR) in each case in front of a row of the tools in an entire stroke range (BG). The thread guide apparatus has at least two rotary elements (4, 5) arranged as a pair, wherein the rotary elements (4, 5, 20, 21, 30, 31, 40, 41) of a pair are arranged eccentrically with respect to one another and one above another in the axial direction, and wherein the rotary elements (4, 5) of a pair are drivable in opposite directions of rotation (R1, R2). Each rotary element (4, 5, 20, 21, 30, 31, 40, 41) has at least one thread guide (4a, 4b, 4c, 5a, 4b, 4c, 20a, 20b, 21a, 21b, 30a, 30b, 40a, 40b), configured as a driver element, for laying the thread in one of the directions (HI, HR).

Description

DEVICE AND METHOD FOR PREVENTING FILES AND TEXTILE MACHINE

The invention relates to a device and a method for presenting threads for stitch-forming tools of a textile machine, which are arranged in at least one row, and a corresponding textile machine.

A textile machine designed as a warp knitting machine, in particular as a Raschel machine, is described, for example, in DE 1 268 305 A. A yarn designed as a weft thread is presented by a yarn guide of a long-shot device, which is movable by means of an actuating cylinder between two reversal points, during a stitch forming operation approximately parallel to the knitting needle row at the back. At the time of the Abschlagstellung the needles across the row of needles, the weft thread is brought under the action of suction nozzles on the front of the knitting needle row.

Since the thread guide between the reversal points must be accelerated and decelerated, the speed at which the thread guide can be moved by means of the actuating cylinder, limited.

From DE 17 60 860 C3 a device for presenting weft threads for warp knitting machines, in particular for Raschel machines, is known in which a guided in an orbit yarn guide is provided. It is designed as a rod rotary element, at the end of the thread guide is arranged. The rod is rotatable about a direction perpendicular to its extension direction axis in a rotational direction. The weft thread is guided by the spool through the axis of the rod to the yarn guide. In the area of the material web edges, holding elements are provided around which the weft yarns can be laid through the yarn guide. The drive for the holding elements is matched to the rotational movement of the rod, that the weft threads do not intersect between the holding elements. The holding elements also serve as guide members for applying the weft threads to the warp threads.

A warp knitting machine, in particular Raschel machine, with a device for introducing a weft thread is known from DE 1 920 477 A. The weft thread is prepared by means disposed in the region of the web edges holding members outside the needle zone and applied by means of guide members to the warp threads. For providing the weft thread guided in an orbit several yarn guides are provided, each of which is associated with a synchronous circulating coil holder. Between the thread guides and the knitting needles memory members for receiving a plurality of goods width corresponding weft thread lengths are arranged.

A device for providing weft threads on warp knitting machines is described in DE 20 35 007 A. The device comprises a thread guide made of a tube, which is guided by a circulating belt over turning points in the region of the material web edges. Storage devices are provided which receive the individual weft lengths and which are moved in the direction of the knitting tools.

A warp knitting machine, in particular Raschel machine, for the production of warp netware with long weft yarns with a device for endless feeding several weft threads is described in DE 24 01 050. A carriage sets the weft threads in mutually arranged conveyor belts, through which the weft threads are guided to the knitting tools.

The object of the invention is to develop a device and a method for presenting threads for stitch-forming tools of a textile machine and a corresponding textile machine, wherein the threads are presented to the tools at high speeds. In particular, the speed of moving back and forth should be increased.

This object is achieved by the characterizing features of the independent claims.

A device according to the invention for presenting threads for stitch-forming tools of a textile machine, which are arranged in at least one row, comprises a thread guide device which has at least one rotary element with at least one thread guide. The thread guide device is designed to move a weft thread back and forth in two directions in the area in front of itself over a stroke range extending tools of the textile machine.

The yarn guide device has at least two rotary elements arranged as a pair, wherein the rotary elements of a pair are arranged one above the other in the axial direction and can be driven in opposite directions of rotation. Each rotary element comprises at least one thread guide designed as a driver element for laying the weft thread in one of the directions.

In one embodiment, the driver elements are designed as driver wings. The formation of the thread guide as driver wing allows easy thread guide without hassle through tubes or eyelets. So-called traversing devices with rotors driven in opposite directions are known for winding threads into cheeses. DE 83 02 278 describes a winding machine for winding threads on bobbins with a traversing device, through which the thread over one of the coil length substantially corresponding traverse stroke is moved back and forth substantially transversely to the direction. The traversing device comprises two eccentrically mounted rotors which are driven in opposite directions and driven in opposite directions. Each of the rotors has at least two driving arms, wherein the driving arms of the two rotors rotate in two closely spaced, penetrated by the thread trajectory planes of rotation.

In contrast to the winding of rotating cheeses is presented with the device according to the invention, the thread the tools, i. provided and incorporated in the stitch formation.

A yarn guide device with at least two rotating yarn guides for each one direction of the reciprocating motion in front of the mesh-forming tools allows a much higher speed of laying the thread than in known yarn guide devices. This simplifies the presentation of the thread and thus the entire mechanical complexity of the textile machine.

In warp knitting machines, speeds of, for example, 1500 meters per minute can be achieved with the yarn guide device with which a weft thread is moved back and forth. This speed is sufficient for certain warp knitting machines, for example for many Raschel machines, to submit the weft without additional storage device.

The use of this fast yarn guide device offers new uses, eg. In the fields of meshing, reinforcement textiles, geotextiles or lace.

In one embodiment, the thread guide device is designed to submit the thread over a stroke range per pair of rotary elements from 0.05 cm to 100 cm, in particular from 0.5 cm to 50 cm.

In one embodiment, the device comprises a feeding device which is adapted to supply the unidirectional thread to the tools. The feeder is formed, for example, as a gripper extending along the tools. In one embodiment, the device has a holding device with two holding elements, which are arranged in the region of reversal points of the thread at a distance of the stroke range. Each retaining element is adapted to receive the thread laid by the thread guide device in one direction.

In one example, the holding device is configured to supply the held thread to the tools. In an alternative example, a feeding device is provided in addition to the holding device.

A yarn guide device with two rotating yarn guides for one direction of the reciprocating movement makes it possible to set a phase shift between the two yarn guides.

As a constant phase shift, the angle between the start position of the first thread guide of the upper rotary member of a pair, the thread laid in the one direction, and the starting position of the thread receiving second thread guide of the lower rotary member, the thread back in the direction (forth) laid, referred to when the two rotating elements rotate in opposite directions at the same rotational speed. A changing phase shift is produced by different rotational speeds of the rotating elements of a pair.

In one example of a pair with two rotary elements, each rotary element has a thread guide designed as a driver wing. Each yarn guide is adapted to wind the yarn at half a revolution, i. 180 ° rotation over the stroke range in one direction. With a phase shift of the two yarn guides of the rotational elements driven in opposite directions of rotation of 0 °, i. at the same starting position, the thread is alternately moved back and forth by one and the other thread guide.

In an alternative of this example, each yarn guide is adapted to move the yarn at one-quarter of a revolution, ie, a 90 ° rotation, over the stroke range in one direction. In a phase shift of the two yarn guides driven in opposite directions of rotation of 180 °, the yarn is laid by a yarn guide in one direction, held at a Fadenumkehrstelle, moved by the other yarn guide in the other direction and again held at the Fadenumkehrstelle. The thread is held in a feeder or at the thread reversal points by the holding device, for example. In one embodiment, the rotary elements each have at least two yarn guides. In one revolution of the corresponding rotary element, the thread can be laid twice in the corresponding direction, for example, two yarn guides a rotary element.

In one embodiment, the z. B. arranged as driving wing yarn guide of a rotary element evenly distributed over the circumference.

In one alternative, they are unevenly distributed around the circumference.

In one embodiment, the yarn guide device comprises a number of pairs each having two rotary elements. The pairs are arranged side by side. The yarn guide device is configured such that by each pair the yarn is laid over a stroke range corresponding to a total stroke range divided by the number of pairs. In this case, the thread to be laid in one direction is transferred from one pair of rotary elements to the next pair. The size of the rotary elements increases with increasing stroke range and reaches the limits of the space available in the textile machine. When arranging several pairs next to each other, the size can be reduced or the stroke width can be increased. In the arrangement of several pairs of rotary elements, a total stroke range up to about 600 cm is possible.

A textile machine according to the invention with at least one row of machine-forming tools each has one of the devices described above for each row of tools.

Textile machines with stitch forming tools arranged in at least one row, for example warp knitting machines, namely automatic warp knitting machines, Raschel machines and crochet galloon machines, as well as stitch knitting machines and flat knitting machines. A thread, which is to be provided as knitting tools of a warp knitting machine or a stitchbonding machine or knitting tools or a flat knitting machine, is designed as a warp thread or as a weft thread.

When presenting the thread for the stitch-forming tools, the thread laid in at least one direction is laid in front, behind or over the tools.

The features and advantages of the method claims are substantially the same as those of the corresponding apparatus claims.

The invention will be further explained with reference to examples shown schematically in the drawing. The illustrated examples relate to the invention as warp knitting machines trained textile machines with a device according to the invention for presenting threads for a textile machine, and that are designed for presenting weft threads for the warp knitting machine. Show it:

Fig. 1 is an illustration of the principle of a warp knit with a weft thread; Fig. 2a is a schematic and perspective view of a pair of

Rotary elements of a first device according to the invention for presenting filaments in a first position;

Fig. 2b is a corresponding to Fig. 2a schematic representation in a second

Position;

Fig. 3 is a schematic representation of an inventive than

Warp knitting machine trained textile machine with the

inventive device of the first example;

Fig. 4 is an illustration of the principle of another Kettengewirks with a

Weft yarn; and

Fig. 5 is a schematic representation of three pairs of rotary elements one

second device according to the invention for the presentation of threads.

First example

In the first example, the textile machine as a warp knitting machine with a device for presenting designed as weft yarns before arranged in a row, designed as knitting tools tools.

FIG. 1 schematically shows a section of a narrow band of a warp knit, which can be produced by the warp knitting machine. The warp knitting machine is designed, for example, as an RL raschel machine with a series of knitting tools, RL meaning right-left stitching. In the illustrated example, the warp knit fabric is made of five stitch-forming warp yarns 1 and a weft yarn 2. FIG. 1 shows a trimmed stitch row and four complete stitch rows with three shot reversal points 3.

The device for presenting the weft thread for the knitting tools has a thread guide device. Figures 2a and 2b show by means of a perspective view of the principle of the yarn guide device It is adapted to the weft thread 2 in the area in front of the knitting tools of the warp knitting machine, over a, indicated in Figure 2b, total stroke range B extend, in two directions Hl, HR back and forth to move.

The yarn guide device has two rotary elements 4, 5 arranged as a pair. The rotary elements 4, 5 are arranged in front of a series of knitting tools, wherein in the figures 2a, 2b tee boards 6 and five needles 7 of the knitting tools of the warp knitting machine can be seen. The rotary elements 4, 5 of the pair are arranged one above the other in the direction of their common axis of rotation D, which is shown in FIG. The rotary elements 4, 5 of the pair can be driven in opposite directions of rotation R1, R2. The rotary element 4 is arranged above the rotary element 5 in the example shown in FIGS. 2 a, 2 b. In this example, the axis of rotation of the two rotary elements 4, 5 runs parallel to the direction of movement RZ of the latch needles 7 and thus perpendicular to the row of knitting tools.

Each rotary element 4, 5 has three thread guides 4a, 4b, 4c, 5a, 5b, 5c designed as entrainment vanes for laying the weft thread 2 in one of the directions Hl, HR.

In a first position shown in FIG. 2a, the warp threads 1 coming from above in FIGS. 2a and 2b are guided around the latch needles 7 to form a next stitch above the tongue 7a of the latch needle 7. The warp threads 1 each form below the tongue 7a of the latch needle 7 a stitch into which a fabric section 2G of the weft thread 2 running from left to right is already taken in FIG. 2a. In FIG. 2 a, the weft thread 2, starting from the weft reversal point 3, is laid by the yarn guide 4 a of the rotary element 4 in the direction H 1 in front of two reed needles 7.

FIG. 2b shows the transfer of the weft thread 2 from the yarn guide 4a of the upper rotary element 4 to the yarn guide 5a of the lower rotary element 5. The latch needles are in a knock-off position.

Figure 3 does not show to scale and schematically the warp knitting machine with the device for presenting the weft thread 2 before the knitting tools, and that with reference to a schematic vertical cross section. The yarn guide device with the rotary elements 4 and 5 are arranged in front of the knitting tools 7 of the knitting machine. The position of the rotary elements c4, 5 corresponds to that of FIG. 2a.

Of the knitting tools, one of the reed needles 7, one of the deburring boards 6, one of the perforated needles 8 and one of the warp threads 1 are shown. The warp threads 1 are guided through the perforated needles 8 to the latch needles 7. The weft thread 2 is from a coil 9 to the yarn guide 4a of the rotary member 4, by which he is moved in front of the latch needle 7 below the tongues 7a.

The rotary elements 4, 5 of a pair are arranged so that the rotating yarn guides 4a, 4b, 4c, 5a, 5b, 5c cross the yarn path of the weft yarn 2 from the spool 9 to the knitting tools.

The warp knitting machine is indicated by a rear side wall 10 and a foundation 1 1. The warp knitting machine has a pair of rollers 12 and a take-up 13 for deduction of the warp knit KG produced in the draw direction P behind the knitting tools, in FIG. 3 on the left side.

In operation, the weft thread 1 is in the area in front of the over the entire stroke width B extending knitting tools of the warp knitting machine in two directions Hl, HR moved back and forth.

The arranged as a pair of rotary elements 4, 5 of the Fadenführervorrichung be in the axial direction one above the other and in opposite directions of rotation R1, R2 driven. The weft thread 2 is laid by the yarn guide 4a, 4b, 4c, 5a, 5b, 5c of a rotary element 4, 5, each in one of the directions Hl, HR. That by the rotating yarn guides 4a, 4b, 4c, 5a, 5b, 5c of the rotary elements 4, 5 of a pair of weft thread 2 is detected in the yarn path of the weft thread 2 from the coil 9 to the knitting tools 2, moved back and forth and presented to the knitting tools ,

The weft thread 2 is guided by the yarn guides 4a, 4b, 4c of the rotary member 4 in the direction of Hl, in Figures 2a, 2b from right to left, and by the thread guides 5a, 5b, 5c of the rotary member 5 in the direction of HR, in Figures 2a , 2b moved from left to right. In this case, the weft thread 2 is guided alternately by the yarn guides 4a, 4b, 4c of the rotary element 4 and the yarn guides 5a, 5b, 5c of the rotary element 5. For this purpose, for example, as shown in Figure 2b, the weft thread 2 taken over by the yarn guide 5b of the yarn guide 4a.

In an alternative example, the axis of rotation of the two rotary elements extends at an acute angle to the direction of movement RZ of the latch needles 7.

In an alternative example, the two rotary elements of a pair are arranged eccentrically parallel to the row of knitting tools.

In an alternative example, the warp knitting machine is designed as a RR raschel machine with two series of knitting tools. The warp knitting machine has a device for presenting a weft thread for each of the two rows. Second example

The second example corresponds to the first example except for the features described below.

FIG. 4 schematically shows a section of a narrow band of a warp knit KG. In the illustrated example, the warp knit KG is made of nine stitch-forming warp threads 1 and a weft thread 2. Figure 1 shows a trimmed course and nine complete courses. The weft thread 2 is guided in the upper five courses with five shot reversal points 3 around all the stitches in a row. In the lower four courses, the weft thread 2 is only through a portion of the stitches, namely four stitches leads, where in addition to another outer Schussumkehrstelle 3 two internal Schussumkehrstellen 3i are formed.

Figure 5 shows the principle of a yarn guide device of the device of the second example. The yarn guide device comprises a number N of three pairs, each with two rotary elements 20, 21, 30, 31, 40, 41, each having two trained as a driving wing yarn guide 20a, 20b, 21a, 21b, 30a, 30b, 31a, 31st b, 40a, 40b, 41a, 41b. The three pairs are arranged side by side along an entire stroke range BG. Each pair is designed to lay the weft over a Teilhubbereich BT. The stroke range BT corresponds to the total stroke range BG divided by the number N of pairs, i. divided by 3.

The stroke range BT of a pair of rotary members 20, 21, 30, 31, 40, 41 in this example is 3 cm. The entire stroke BG is z. B. 9 cm.

In operation, in each case by a pair of three juxtaposed pairs, each with two rotary elements 20, 21, 30, 31, 40, 41 of the weft thread 2 is moved over a stroke range BT, which corresponds to the total stroke range BG divided by the number N of pairs. This is shown for the top five courses of the warp knitted fabric KG shown in FIG.

In the lower four courses of the warp knitted fabric KG shown in FIG. 4, the weft yarn 2 is laid by the right pair of rotary members 20, 21 via the right three stitches and laid by the middle pair of rotary members 30, 31 via a stitch.

In an alternative, the stroke range of a pair of rotary members is 0.5 cm to 50 cm. In an alternative of a warp knit multiple layers of weft threads are provided.

In this case, several weft threads are moved back and forth simultaneously by a plurality of pairs of rotary elements of the thread guide device and presented one above the other the knitting tools.

Such warp knit fabrics can be used in lightweight construction, for example for coposite structures in wind turbines or in automobiles.

LIST OF REFERENCE NUMBERS

1 warp B lifting range

2 weft RZ direction

2G knit section R1 direction of rotation

2S Coil section R2 Direction of rotation

3 shot reversal point H l direction

4 rotary element HR direction

4a-4c thread guide P withdrawal direction

5 rotary element KG warp knitted fabric

5a-5c yarn guide BG total stroke range

6 Debiting board BT Lifting range of a pair

7 latch needle

7a tongue

8 hole needle

9 coil

10 sidewall

1 1 foundation

12 pairs of rollers

13 take-up tree

20, 21 rotary elements

20a, 20b, 21a, 21b thread guide

30, 31 rotary elements

30a, 30b, 31a, 31b yarn guide

40, 41 rotating elements

40a, 40b, 41a, 41b yarn guide

Claims

claims

1 . Device for presenting yarns for stitch forming, arranged in at least one row tools a textile machine

with a thread guide device having at least one rotary element (4, 5, 20, 21, 30, 31, 40, 41)

with at least one thread guide (4a, 4b, 4c, 5a, 5b, 5c, 20a, 20b, 21a, 21b, 30a, 30b, 40a, 40b),

wherein the yarn guide device is adapted to move a yarn back and forth in front of the row of tools in an entire stroke range (B) in two directions (H 1, HR), characterized in that

the yarn guide device has at least two rotary elements (4, 5, 20, 21, 30, 31, 40, 41) arranged as a pair, wherein the rotary elements (4, 5, 20, 21, 30, 31, 40, 41) of a pair in Axial direction are arranged one above the other and in opposite directions of rotation (R1, R2) are driven,

wherein each rotary element (4, 5, 20, 21, 30, 31, 40, 41) at least one as

Carrier element formed thread guide (4a, 4b, 4c, 5a, 4b, 4c, 20a, 20b, 21a, 21b, 30a, 30b, 40a, 40b) for laying the thread (2) in one of the directions (Hl, HR) having.

2. Apparatus according to claim 1, characterized by a feeding device which is adapted to supply the laid in one direction (Hl, HR) thread the tools.

3. Apparatus according to claim 1 or 2, characterized by a holding device with two holding elements, which are arranged in the region of reversal points of the thread at a distance of the entire stroke range (B, BG), wherein the holding means are adapted to that of the yarn guide device in one direction (Hl, HR) recorded thread and supply the tools.

4. Apparatus according to claim 1 or 2, characterized in that the rotary elements (4, 5, 20, 21, 30, 31, 40, 41) at least two yarn guides (4a, 4b, 4c, 5a, 5b, 5c, 20a, 20b, 21a, 21b, 30a, 30b, 40a, 40b).

5. The device according to claim 1, characterized in that the yarn guide device comprises a number (N) of pairs, each with two rotary elements (20, 21, 30, 31, 40, 41), wherein the pairs are arranged side by side and each pair of thread over a stroke range (BT) corresponding to a total stroke range (BG) divided by the number (N) of the pairs.

6. Textile machine with at least one row of stitch-forming tools, characterized by in each case a device according to one of claims 1 to 5 for each set of tools.

7. A method for presenting yarns for stitch forming, arranged in at least one row tools a textile machine,

with a yarn guide device having at least one rotary element (4, 5, 20, 21, 30, 31, 40, 41) with at least one yarn guide (4a, 4b, 4c, 5a, 5b, 5c, 20a, 20b, 21a, 21b , 30a, 30b, 40a, 40b),

wherein a thread in an entire stroke range (B) is moved back and forth in front of the row of tools in two directions (Hl, HR) by the thread guide device,

characterized in that

at least two rotary elements (4, 5, 20, 21, 30, 31, 40, 41) of the yarn guide device, which are arranged one above the other in the axial direction, are driven in opposite directions of rotation (R1, R2),

wherein by each rotary member (4, 5, 20, 21, 30, 31, 40, 41) with at least one designed as a driver thread guide (4a, 4b, 4c, 5a, 5b, 5c, 20a, 20b, 21 a, 21 b , 30a, 30b, 40a, 40b) of the thread in one of the directions (Hl, HR) is laid.

8. The method according to claim 7, characterized in that by a feeding device in one direction (H l, HR) threaded thread is supplied to the tools.

9. The method according to claim 7 or 8, characterized in that by two

Holding devices, which are arranged in the region of reversal points of the thread at a distance of the entire stroke range (B, BG), taken in each case in a direction (H l, HR) thread and supplied to the tools.

10. The method according to any one of claims 7 to 9, characterized in that in each case by a pair of a number (N) of juxtaposed pairs, each with two rotary elements (20, 21, 30, 31, 40, 41) of the thread guide device over the thread a stroke range (BT) is set, which corresponds to the total stroke range (BG) divided by the number (N) of the pairs.