EP3276062B1 - Warp knitting machine and method for producing a warp knitted item - Google Patents

Description

The invention relates to a warp knitting machine with knitting needles, guide needles and board assemblies with tee edges and holddowns, wherein the knitting needles, the guide needles and the board assembly in a width direction are each juxtaposed, the board assembly has tee boards and the blanking plates separate hold-down and the tee boards and down device at least on a part of their respective trajectories with different motions are drivable.

Furthermore, the invention relates to a method for producing a warp knit fabric, are guided in the threads of a group of threads by guide needles relative to knitting needles, wherein after the knocking off of stitches hold-downs in the yarn sheet.

Such a warp knitting machine and such a method are for example out DE 522 083 C known. Here, the boards used for trapping and knocking are separated and independent of each other educated. Each of the separately operating boards performs a pivotal movement of an axis, wherein the axes are parallel to each other.

Another warp knitting machine is off DE 22 44 096 A1 known. This machine has deburring boards and a piercing comb. The piercing comb performs a circular motion while holding down a weft thread on the debossing board.

DE 636 765 C shows a device for producing double-surface warp knit goods on warp knitting machines for single-surface goods, are provided in the tee boards and a movable grooving comb.

Warp knitting machines of different design differ, inter alia, by the direction of the fabric take-off. When the fabric, that is, the warp knit fabric being drawn, is drawn approximately straight or at a large obtuse angle relative to the yarns being fed, the stripped warp knit retains the stitches on the knitting needles as knitting needles rise in a new stitching operation to receive warp yarns in their heads , In such a deduction, the is used in particular in Raschel machines, results in a relatively hard warp knitted fabric, which acts unpleasant, for example, when worn on the skin.

If the withdrawal of the warp knitted fabric takes place at a smaller angle to the supplied warp threads, as is the case for example with a tricot machine, then the stitches must be held so that the knitting needles can rise without taking the stitches. In this case, so-called containment teeing-off boards are used, which have a teeing-off edge, an inclusion throat and hold-downs. The hold downs cause the stitches to be held to their underlays on the shafts of the knitting needles as the knitting needles rise.

The invention has for its object to provide a further manufacturing possibility for a warp knitted fabric.

This object is achieved in a warp knitting machine of the type mentioned in that a hold-down drive acts in the width direction on the hold-down, by which the hold-down are displaced relative to the tee boards in the width direction.

With such a configuration now warp knitted fabric can be produced with a relatively low voltage, which would otherwise be produced only on so-called Raschel machines. Thus, for example, a tip that could previously only be produced on Raschel machines and thus has a high tension, resulting in a harsh feel, are produced on the new warp knitting machine. This is made possible by the fact that the tee boards and the hold-down at least temporarily moved apart from each other. In another area of the trajectories, the teeing plates and the hold-downs can also be moved together, as will be explained below. The shift in the width direction is also called "lateral offset". If the hold-downs are offset laterally, ie shifted in the width direction, then they move the threads accordingly. The hold-down effect so a temporary underlay.

Preferably, the hold-down drive has a drive stroke in the width direction, which shifts the position of the hold-down device within the collision-free area between two knitting needles in another collision-free area between two knitting needles. The division of the teeing plates and the hold-down corresponds to the pitch of the knitting needles. The sinker blanks and downpers are located in a home position in needle lanes between the knitting needles. The knitting needles can also be referred to as "working needles". If the hold-downs are displaced laterally, and this lateral displacement corresponds to the pitch of the teeing plates or an integral multiple of the pitch of the teeing plates, then acted upon by the retainers threads are also deflected by a division of the teeing plates or by an integer multiple of the pitch of the tee boards laterally , This creates, so to speak, an artificial underlay between two adjacent meshes. The drive stroke may also deviate from the exact pitch as long as the knitting needles can be moved between the holdings without collision.

Preferably, the hold-down drive displaces the hold-down in each case in a straight thread path between a guide needle and a knitting needle. This straight thread path is thus disturbed, so that the knitting needle can rise after the lateral displacement of the hold-down and hold down the threads then the threads of the knitting needles. This can be a relatively low-tension knit produce.

Preferably, the tee boards and / or the hold-down on at least a portion of an enclosure throat. The remaining part of the inclusion throat can then be formed by the hold-down or the debut plates, so that at least in a part of a stitch formation process again results in a configuration that is similar to the conventional Einschließ- teeingplatinen.

Preferably, the hold-down drive is synchronized with a knitting needle drive in such a way that the hold-down drive causes an offset of the hold-down in the width direction before the effect needle drive causes a rising movement of the knitting needles. So first the hold-downs are offset laterally. Thereafter, the knitting needles rise, the hold-down hold the threads.

The object is achieved in a method of the type mentioned above in that one uses hold-down, which are separated from tee boards and the hold-down before the rise of the knitting needles are offset laterally without the tee boards.

As stated above, can be produced in this way a low-tension knitted fabric that can otherwise be designed in the same manner as was previously possible only with a Raschel machine. For example, you can make a fringe with extremely low tension.

This makes it possible to produce a knitted fabric with thinner yarns, so that often results in a completely new feel and / or appearance.

Preferably, the hold-downs each disturb a straight line between the guide needles and the knitting needles. The threads are thus moved out of this straight line.

It is also advantageous if the hold-downs are laterally offset from one position within the collision-free area between two knitting needles into another collision-free area between two knitting needles. The hold-downs are then moved from a needle lane between the knitting needles into another needle lane, so that they do not interfere with the knitting needles when rising.

Preferably, the hold-downs hold a portion of the threads laterally offset during the underlay. This creates an artificial underlay, so to speak.

Preferably, when punching the hold-down in the yarn sheet the tee boards are moved together with the downholders. This movement is perpendicular to the width direction. This movement of the debut plates creates a sinker mesh for each thread.

Preferably, when the knitting needle falls, the debossing board and the hold-downs are moved back. This movement can also take place in a last section of the falling movement of the knitting needle. The blanks and hold-downs are then returned to their home position prior to the next stitch-forming cycle.

Fig. 1a + 1b

schematische Darstellungen von Teilen einer Kettenwirkmaschine,

Fig. 2

eine perspektivische Darstellung der Teile in einem Abschnitt eines Maschenbildungsvorgangs,

Fig. 3

eine Darstellung der Elemente aus Fig. 2 ohne Fäden,

Fig. 4

einen dritten Schritt beim Maschenbildungsvorgang,

Fig. 5

einen vierten Schritt beim Maschenbildungsvorgang,

Fig. 6

einen fünften Schritt beim Maschenbildungsvorgang und

Fig. 7

eine schematische Darstellung ähnlich zu Fig. 1.

The invention will be described below with reference to a preferred embodiment in conjunction with the drawings. Herein show:

Fig. 1a + 1b

schematic representations of parts of a warp knitting machine,

Fig. 2

a perspective view of the parts in a section of a stitch formation process,

Fig. 3

a representation of the elements Fig. 2 without threads,

Fig. 4

a third step in the stitch formation process,

Fig. 5

a fourth step in the stitching process,

Fig. 6

a fifth step in the stitching process and

Fig. 7

a schematic representation similar to Fig. 1 ,

Fig. 1a and 1b schematically show parts of a warp knitting machine, namely a laying needle 1, which is designed here as a perforated needle and a thread 2 leads, a knitting needle 3, which is also referred to as a "working needle", a knock-4 and a hold-5.

Fig. 1a shows schematically the tee. This is assumed here at a rotation angle of 0 ° of a main shaft of the warp knitting machine, also not shown.

Fig. 1b shows a slight opposite Fig. 1a modified embodiment of parts of the warp knitting machine.

In the embodiment according to Fig. 1a an inclusion throat 7 is formed as part of the knock-4. In the embodiment according to Fig. 1b the inclusion throat 7 is formed on the hold-down 5. The interaction of the debossing plate 4 with the hold-down 5 can then achieve the desired inclusion when rising the knitting needle 3.

In a stitch forming operation, the knitting needle 3 (based on the illustrations of the Fig. 1a and 1b ) moves up and down. The guide needle 1 is (also based on the representations of Fig. 1a and 1b ) moved from left to right and from right to left and in between twice perpendicular to the plane of the drawing. The tee board 4 and the hold-5 are moved in the direction of the double arrow 6. The hold-down device 5 forms a separate component from the debossing plate 4, wherein the debossing plate 4 is used for knocking off the stitches and the inclusion function and the hold-down 5 can be moved in addition to the movement in the direction of the double arrow 6 also perpendicular to the plane of the drawing. A hold-down drive used for this purpose is not shown in detail. It may, for example, similar to the drive of a bar on which the guide needles 1 are attached, be arranged at one end of the corresponding bar and act on a cam or the like on a bar which carries the hold-5.

Fig. 2 shows a second step in a schematic perspective view. This second step concerns the "inclusion" which occurs, for example, at 40 ° rotation angle of the main shaft.

After knocking off the stitch, both the knock-down plate 4 and the hold-down 5 are moved transversely to the width direction of the warp knitting machine. This movement is called "forward". The hold-down pierces a thread group formed by a plurality of threads 2. The Debate board 4 pushes with their inclusion throat 7, the stitches forward. This advancement creates a board mesh. The tee board 4 moves together with the hold-5 forward and backward, ie transversely to the width direction in the direction of an arrow 8. In Fig. 3 In addition, a measure 9 for the so-called "inclusion" is shown. This measure results from a distance between the inclusion throat 7 and the back of the needle 3, ie the side of the needle 3, which faces the inclusion throat 7.

How to get in Fig. 2 can recognize, a withdrawal direction 10 is approximately equal to the movement of the knock-4 and the hold-down 5, which is shown by the arrow 8. The take-off direction 10 extends approximately at a right angle to a central feed direction of the threads 2. The angle can also be greater than 90 °. He is definitely less than 180 °. Accordingly, no draft is formed on the mesh by the trigger, which would lead to a strong solidification.

In Fig. 2 You can also see a breast rise 11 of the knitting needle and a head 12 of the knitting needles. The knitting needles 12 are formed here as a slide needles with sliders 17.

Fig. 4 shows a third step in the stitch formation, the displacement of the backing.

As soon as the hold-downs 5 have stung through the yarn sheet 2, they are laterally offset by at least one needle pitch of the knitting needles 3. Previously, ie in the starting position, the hold-down 5 are also in a Nadelgasse between two knitting needles 3, ie in the same position as the teeing plates 4. This offset movement of the holddown 5, the underlay of the fringes is displaced and a stitch on the Shank of the knitting needle 3 is against the breast rise 11 (see Fig. 2 ) held down the rising knitting needle 3. The offset of the hold-down device 5 with the displacement of the thread and the resulting temporary backing may be one or more needle pitches. In this process, however, there is not necessarily a cross connection of the courses to each other. The offset movement of the hold-down device is shown by an arrow 14. The teeing plates 4, however, remain in their original position in the width direction.

Fig. 5 shows a fourth step in which the consideration is made. During consideration, the hold-downs 5 keep the underlay further in position. The mesh 13 lying around the knitting needle 3 are thus held down on the shafts of the knitting needle 3.

Fig. 6 shows a fifth step, in which the knitting needle 3 falls. When falling the knitting needle 3, so in the movement from top to bottom, the hold-5 moves backwards (relative to the Fig. 6 perpendicular to the plane of the drawing). The repression is lifted. The underlay is released. The stitch 13 can be cut off. For this purpose, the tee board 4 may have an additional tee-off device 15. The knock-off device 15 is particularly advantageous if the stitches 13 do not intersect the knock-down plate 4 during knock-off (see Fig. 6 ). For this purpose, it may be provided that the chopping device 15 bridges alleys between tee boards 4.

Since the tee board 4 is arranged in the same direction as the running direction of the fringe, a cross-connection can be created on the tee board 4 by the teeing-15, where the stitch 13 to be rejected can be held against the newly formed mesh. Fig. 7 shows this step in side view. The hold-down 5 is moved back together with the tee board 4, ie along the Arrow 16. This movement can be done together. The knitting needle 3, which is shown here together with the slider 17 can be pulled through the "old" mesh 13.

Since the stitches do not have to be held on the shank of the knitting needle 3 by a high draw on the draw-off, but are held by the hold-downs 5, it is possible to produce a warp knitted fabric with a relatively low tension. As a result, one can also work with thin yarns that have limited tensile strength.

Accordingly, one can also produce, for example, tip, which could previously only be produced on Raschel machines. Such a tip was produced with a high tension and was therefore relatively hard to handle. Using the side, ie in the width direction, movable hold-down 5, now can be a much lower tension warp knit produce, even as a tip.

As mentioned above, the offset movement of the hold-down 5 to displace the thread, a needle pitch of the knitting needles 3 or an integer multiple of the needle pitch of the knitting needles 3 amount. This division is consistent with the division of the hold-5 and the division of the teeing plates 4. The division does not have to be strictly adhered to, as long as the hold-5 can move without collision between the knitting needles 3.

How to particular in 4 to 6 can recognize, caused by the lateral offset of the hold-5 a disturbance of a straight line between the guide needles 1 and the knitting needles 3. This results in how to particular in Fig. 4 can recognize, an intermediate section 18 of the threads 2, which form an artificial underlay.

The knock-off device 15 is used in particular in order to be able to cut off a fringe.

The Einschlußmaß 9 is a criterion for the tension in warp knitted fabric. You can produce relatively loose board mesh, which has a favorable effect on the feel of the warp.

By the lateral offset of the threads 2, which is caused by the hold-down 5, an artificial backing is created, so that you can produce relatively loose fringes with the warp knitting machine.

Claims (13)

1. Warp-knitting machine having knitting needles (3), guide needles (1), and sinker assemblies having knock-over edges (15) and downholders (5), wherein the knitting needles (3), the guide needles (1), and the sinker assemblies are in each case disposed beside one another in a width direction, wherein the sinker assembly has knock-over sinkers (4) and downholders (5) that are separate from the knock-over sinkers (4) and the knock-over sinkers (4) and the downholders (5) on at least part of the respective motion paths thereof are drivable by way of dissimilar movements, characterized in that a downholder drive acts on the downholders (5) in the width direction, by way of which downholder drive the downholders (5) relative to the knock-over sinkers (4) are displaceable in the width direction.
2. Warp-knitting machine according to Claim 1, characterized in that the downholder drive has a drive stroke in the width direction, said drive stroke displacing the position of the downholder (5) within the collision-free region between two knitting needles (3) to another collision-free region between two knitting needles (3).
3. Warp-knitting machine according to Claims 1 or 2, characterized in that the downholders (5) and the knock-over sinkers (4) are conjointly displaceable transversely to the width direction.
4. Warp-knitting machine according to one of Claims 1 to 3, characterized in that the downholder drive displaces the downholder (5) in each case into a rectilinear yarn path between a guide needle (1) and a knitting needle (3).
5. Warp-knitting machine according to one of Claims 1 to 4, characterized in that the knock-over sinkers (4) have at least part of a locking moulding (7).
6. Warp-knitting machine according to one of Claims 1 to 5, characterized in that the downholders (5) have at least part of the locking moulding (7).
7. Warp-knitting machine according to one of Claims 1 to 6, characterized in that the downholder drive is synchronized with a knitting-needle drive in such a manner that the downholder drive causes offsetting of the downholders (5) in the width direction before the knitting-needle drive causes an ascending movement of the knitting needles (3).
8. Method for producing a warp-knitted fabric, in which method yarns (2) of a yarn group are guided relative to knitting needles (3) by guide needles (1), wherein, upon loops (13) having been knocked over, downholders (5) penetrate the yarn group, characterized in that downholders (5) which are separate from knock-over sinkers (4) are used, and the downholders (5) without the knock-over sinkers are laterally offset before the knitting needles (3) ascend.
9. Method according to Claim 8, characterized in that the downholders (5) in each case disturb a straight line between the guide needles (1) and the knitting needles (3).
10. Method according to Claim 8 or 9, characterized in that the downholders (5) during underlaying keep a portion of the yarns (2) laterally offset.
11. Method according to one of Claims 8 to 10, characterized in that the downholders (5) are laterally offset from one position within the collision-free region between two knitting needles to another collision-free region between two knitting needles.
12. Method according to one of Claims 8 to 11, characterized in that the knock-over sinkers (4) are moved conjointly with the downholders (5) when the downholders (5) penetrate the yarn group.
13. Method according to one of Claims 8 to 12, characterized in that the knock-over sinker (4) and the downholders (5) are moved back when the knitting needle (3) descends.

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