EP2336412A1 - Float needle for a gallon crocheting machine - Google Patents

Abstract

The crochet galloon machine needle (26) such as floating stitch needle has shank with hook and hook head that transitions into a resilient leg closing a hook inside space. The hook head has hook inside facing toward the hook inside space and hook outside facing away from the shank. The guide projection (40) is formed on the hook outside, while the hook inside is curved in the form of a circular arc around a center. The guide projection is located above a hook center.

Description

The invention relates to a crochet galloon needle, i. a float needle specially designed for use in a crochet galloon machine.

Crochet galloon machines are special machines for the production of textile ribbons, such as straps, mattress ribbons, zipper ribbons, straps, for example brassieres, elastic bandages, gauze bandages or the like.

A Häkelgalonmaschine for the production of textile ribbons is for example from the DE 44 17 692 A1 and the DE 29 30 824 A1 known. The machine comprises a group in the same direction along forward and backward moving needles, each end carrying a hook with resilient leg. The needles each produce a knit fabric, which consists for example of wales or mesh chains, which are also referred to as "closed fringe". A group in the same time moving needle needles sets to at least one ground yarn and possibly also in addition an elastic thread. In addition, a yarn guide is provided, the underside of which forms the stitch chain thread underlaying a so-called weft thread or goes back and forth going. This weft binds in the mesh chains.

Such a crochet galloon machine requires high take-off forces in order to work properly. The pull-off forces pull the textile tape away from the needles and thus stretch the still hanging in the needles half-stitches to create enough space for the safe insertion of the weft thread and to ensure the ejection of newly formed stitches. With increasing product density, the fabric take-off tension must be reduced to produce the small stitches necessary to produce a high product density. In the case of textile fabrics with a high product density, the distance of the mesh head of a mesh produced to the mesh bottom of the semi-mesh located in the needle hook is very small and in special cases almost equal to zero. This complicates the secure underlaying a weft thread between the mesh head of the mesh produced and mesh bottom of the half-stitch. Depending on the pattern of the textile tape to be produced, a weft thread can connect all the stitches or only a part of the stitches of a tape. In the latter case, the weft is called a partial weft.

On this basis, it is an object of the invention to provide improved system parts, which allow the process-reliable production of textile tapes with high product density.

• Die erfindungsgemäße Häkelgalonmaschinennadel weist einen Haken auf, der einen Hakeninnenraum begrenzt. An der vom Schaft weg weisenden Hakenaußenseite ist ein Flottiervorsprung ausgebildet. Dieser erstreckt sich wie eine Nase von der Hakenaußenseite weg. Er dient dazu, den Schussfaden beim Einlegen desselben in die ihm zu kommende Position in der Maschenware zu führen. Aufgrund des erfindungsgemäßen Flottiervorsprungs an der Häkelgalonmaschinennadel kann die Fadenspannung des Schussfadens reduziert und trotzdem ein prozesssicheres Unterlegen des Schussfadens gewährleistet werden.

This object is achieved by the Häkelgalonmaschinennadel according to claim 1:

• The Häkelgalonmaschinennadel invention has a hook, which limits a hook interior. At the side facing away from the shaft hook outside a Flottiervorsprung is formed. This extends like a nose away from the hook outside. It serves to guide the weft thread when inserting the same into the position to be approached in the knitwear. Due to the invention Flottiervorsprungs on Häkelgalonmaschinennadel the thread tension of the weft thread can be reduced and still a reliable underlaying of the weft thread can be ensured.

The flotation projection ensures, even with reduced withdrawal tension, that the weft yarn, when presented and the needles are expelled, reaches the desired weft position. This is especially true for very dense textiles that can not be made secured due to the process-related reduction of the withdrawal voltage otherwise.

Due to the necessary reduction of the withdrawal tension for the production of knitwear with increased mesh density, the forces acting on the crochet galloon machine needle are reduced considerably. Accordingly, the yarn tension in the yarn feed to the changed conditions must be adjusted so that the forces acting on the hole needles or other elements involved in the stitch forming process (system parts) forces are changed.

In a specific embodiment, the hook inner side is circularly curved about a center which lies in the hook interior. However, the outer contour on the outer hook side deviates from the circular arc shape. The flotation projection arranged here preferably has at least one straight ramp, which extends from its tip to a hook underside, which can also be regarded as a needle back. The ramp present on the float projection is preferably straight. But it can also have different shapes, such as an S-shape or the like. In the transverse direction, the ramp is preferably rounded, so that it passes without sharp edges in the flanks of the Flottiervorsprungs and the hook.

The floating projection can have an upper side that is straight, for example. Preferably, both the upper side as well as the ramp are each inclined at an angle to a central axis coinciding with the needle longitudinal direction. The angle enclosed by the upper side with the central axis is preferably smaller than the angle enclosed by the ramp with the central axis.

The Flottiervorsprung has regardless of its other form on a pointing away from the shaft tip. This tip is preferably rounded. Preferably, a spherical rounding is provided. The radius of curvature is preferably less than the radius of curvature of the hook inside. The tip is preferably arranged above the central axis passing through the center of curvature of the hook inner side. This gives the Flottiervorsprung a pronounced guiding effect for the weft.

The top and the ramp may, as mentioned, both be straight. The imaginary extension of these edges preferably intersects at a point which lies above the central axis running through the center of curvature of the hook inner contour. This gives the ramp a large catch area within which it can guide an impacting weft to the bottom of the needle.

The flanks of the floating projection can be designed to converge parallel to one another or to one another. You can also be just trained or have a different shape from the flat contour. Preferably, the floating projection has a thickness of at least about 20% to 30% of the needle thickness.

• Figur 1 eine mit der Häkelgalonmaschine erzeugte einfache unplattierte Maschenware,
• Figur 2 eine Häkelgalonmaschine bei der Herstellung plattierter Maschenware nach dem grundsätzlichen Vorbild der Maschenware nach Figur 1, in ausschnittsweiser perspektivischer Darstellung,
• Figur 3 eine Häkelgalonmaschinennadel der Häkelgalonmaschine nach Figur 2, in Seitenansicht,
• Figur 4 die Häkelgalonmaschinennadel nach Figur 3, in ausschnittsweiser Draufsicht,
• Figur 5
  und 6 vereinfachte Detaildarstellungen der Häkelgalonmaschine nach Figur 2, in perspektivischer Darstellung, in verschiedenen Arbeitspositionen zur Erläuterung des Maschenbildungsprozesses, und
• Figur 7 eine weitere Detaildarstellung des Maschenbildungsprozesses zur Erläuterung des Einlegens eines Schussfadens bei geringer Abzugspannung.

Further details of advantageous embodiments of the invention will become apparent from the drawing, the following Description or claims. The description is limited to essential aspects of the invention and some other facts. The drawing is to be used as a supplement to the description. Show it:

• FIG. 1 a plain unplated knit fabric produced with the crochet galloon machine,
• FIG. 2 a crochet galloon machine in the production of clad knitted fabric after the basic model of the knitwear after FIG. 1 in a fragmentary perspective view,
• FIG. 3 a crochet galloon machine crochet galloon needle FIG. 2 , in side view,
• FIG. 4 the crochet galloon needle after FIG. 3 in a fragmentary plan view,
• FIG. 5
  and FIG. 6 is a simplified detail of the crochet galloon machine FIG. 2 , in perspective, in different working positions to explain the stitch formation process, and
• FIG. 7 a further detail of the stitch forming process to explain the insertion of a weft thread at low trigger voltage.

In FIG. 1 a simple example of a belt-shaped knitted fabric 10 produced with a crochet galloon machine is shown in fragmentary form. The knitted fabric 10 comprises a plurality of "closed fringes", mutually non-meshed mesh chains 11, 12, 13, 14, which are arranged side by side and each formed by a separate ground yarn 15, 16, 17, 18. The longitudinal directions of the respective stitch chains 11, 12, 13, 14 coincide with the longitudinal direction of the textile tape to be produced. Transversely thereto, a weft thread 19 is provided which alternately traverses the rows of stitches 11 to 14 from one edge to the other and is integrated into the individual stitches. The weft thread 19 can run approximately at right angles to the longitudinal direction of the band-shaped knitwear or the stitch chains 11 to 14. Therefore, the weft thread 19 always runs in succession through the stitches of each stitch chain 11 to 14 that are produced at the same height at the same time.

It can, like FIG. 2 11 shows, in addition to the main thread 15 another warp thread 20 are incorporated into the knitted fabric on the basis of the first course 11. For example, the ground yarn 15 is a non-elastic (hard) yarn while the warp yarn 20 may be an elastic (soft) yarn. In addition, the individual mesh chains 11, 12, etc. can be intermeshed with each other, as in FIG. 2 also indicated. Which type of binding and which stitch pattern will ultimately be achieved exactly depends on the relative movement of the system parts involved in the stitch formation process, which will be explained below.

To the stitch formation system include perforated needles 21 which are held in a first bar 22, and optionally further needles 23, which are held in a second bar 24. The first of the piercing needles 21 may, for example be provided for guiding the ground yarn 15. More on the same bar held hole needles lead the staple threads of the other mesh chains. The perforated needle 23, however, is provided for guiding a further warp thread 20. Further hole needles of the Barre 24 lead corresponding warp threads.

Next, a yarn guide 25 is provided for the insertion of the weft thread 19, which traverses once during the stitch formation process for each course of stitches from one edge of the fabric to the other and thereby places the weft thread on the half-stitches just formed.

The knitting system further includes crochet galloon needles, hereafter referred to as needle (s) 26. The needles 26 are taken at the end in a not further illustrated Barre. In addition, they are slidably mounted in a needle bed 27 in the needle longitudinal direction. The needles 26 are supported in the needle bed 27 in corresponding needle channels 54, on the bottom of which they slide axially back and forth during the stitch forming process.

The needles 26 are identical to each other, so that the following description of a needle 26 applies to all other needles 26 accordingly.

In the invention, particular attention is paid to the formation of the needle 26. This is in the FIGS. 3 and 4 separately illustrated. The needle 26 has a shaft 28 which, as in FIG FIG. 3 illustrated, straight or too his in FIG. 3 can not be bent or cranked or otherwise formed on the left cut and therefore not shown end. The shaft 28 goes to his in FIG. 3 right end, in a stitch forming part 29 over. Along the stitch forming part 29, the needle 26 has a lower narrow side 30, which is for example straight and also referred to as a needle back.

The narrow needle top 31 extends from the shaft coming initially, for example, parallel to the narrow lower side 30 or at a slight inclination to this. At a transition point 32, the needle top side 31 adjoins a needle head, which is designed as a hook 33 and belongs to the stitch formation part 29.

The hook 33 encloses an interior 34 which is limited to the shell lower side 30 by a straight extension 35 of the shaft 28. The extension 35 merges into a hook head 36, the inner contour of which is e.g. circular arc-shaped hook inside 37 determines. This is curved, for example circular arc around a center 38. The central axis A is assumed to extend through this center 38 and extends through an imaginary hook center. Even in the case of a non-circular arc-shaped hook inner side 37, the central axis A runs centrally at half the height through the inner hook side 37 or centrally at half the height through the inner space 34.

The hook head 36 of an in FIG. 3 shown crocheting machine needle points to his imaginary in FIG. 3 dashed registered to the hook inner side 37 at a constant distance extending outside hook 39 a Flottiervorsprung 40 which extends away from the shaft 28 and the hook 33. The Flottiervorsprung 40 is down, that is limited to the lower side 30 through a straight ramp 41, for example, and at the top by a straight top 42, for example. The ramp 41 and top 42 merge into one another at a preferably rounded tip 43. This tip 43 is preferably above the central axis A arranged. The radius of curvature of the tip is preferably significantly smaller than the radius of curvature of the inner side 37.

In addition, there is an intersection 44 of two imaginary in FIG. 3 dotted registered extensions of the ramp 41 and the top 42 preferably above the central axis A and also preferably above a point 45, in which the hook inner side 37 merges into the straight contour of a preferably elastically formed leg 46. In other words, the distance of the point 45 to the central axis A is less than the distance of the point of intersection 44 to the central axis A. Further, the leg 46 is preferably rounded at its end. This rounding is preferably formed in accordance with the rounding of the tip 43.

Said leg 46 is substantially straight and lies resiliently against the shaft 28 or in a recess formed thereon, for example, with an end 47 bent somewhat.

The Flottiervorsprung 40 has two flanks 48, 49, which, as FIG. 4 shows, can be formed as flat surfaces. The surfaces converge toward the tip 43, for example. However, the flanks 48, 49 may also be arcuately curved or otherwise formed. In addition, they can be arranged parallel to each other. The flanks 48, 49 preferably merge with rounded edges into the, for example, also preferably flat surfaces of the upper side 42 and the ramp 41.

Any known hook of a needle, regardless of its position, its shape and its cross-section, may be provided with a floating projection 40 according to the invention.

• Zum Verständnis wird darauf hingewiesen, dass alle Nadeln 26 in dem Nadelbett 27 zueinander synchron bewegt werden. Ebenso werden die an einer gemeinsamen Barre gehaltenen Lochnadeln 21 zueinander synchron bewegt. Der Maschenbildungsprozess läuft ab, indem die Nadeln 26 in bekannter Weise vorwärts und rückwärts bewegt werden, wobei die Lochnadeln 21 darauf abgestimmt den Grundfaden 15 in bekannter Weise um die Nadel schlingen, um ihn zur Maschenbildung in den Haken 33 einzulegen, jeweils um eine neue Halbmasche 50 zu bilden. Wird die Nadel 26 danach ausgetrieben, läuft die Halbmasche 50 infolge der hohen auf die Maschenkette 11 einwirkenden Abzugskraft aus dem Haken 33 heraus auf den Schaft 28. Die Lochnadel 21 schlingt den Grundfaden 15 dann erneut um den Haken 33 und legt ihn in diesem ein. Bei Rückzug der Nadel 26 gleitet die auf dem Schaft 28 sitzende Halbmasche 50 über den Haken 33 ab wobei der von dem Haken 33 gefangene Faden durch die bei diesem Vorgang entstehende Masche gezogen wird. Dadurch entsteht im Innenraum 34 des Hakens 33 eine neue Halbmasche 50. Mit der neuen Halbmasche 50 ist wieder der in Figur 5 gezeigte Zustand erreicht.

The process of textile production is described below on the basis of FIGS. 5 to 7 the example of the mesh chain 11 and the weft thread 19 from FIG. 1 explains:

• For the sake of understanding, it should be noted that all the needles 26 in the needle bed 27 are moved synchronously with each other. Likewise, the held on a common bar needle needles 21 are moved synchronously to each other. The stitching process is accomplished by advancing and retracting the needles 26 in a known manner, with the piercing needles 21 looped around the needle thread 15 in a known manner around the needle to be stitched into the hook 33, one new half stitch at a time 50 to form. If the needle 26 is then expelled, the half-stitch 50 runs out of the hook 33 out onto the shaft 28 as a result of the high pull-off force acting on the stitch chain 11. The piercing needle 21 then wraps the main thread 15 again around the hook 33 and places it in this position. Upon withdrawal of the needle 26, the semi-stitch 50 seated on the shaft 28 slides over the hook 33, whereby the thread caught by the hook 33 is pulled by the stitch formed during this process. This results in the interior 34 of the hook 33 a new half-stitch 50. With the new half-stitch 50 is again in FIG. 5 shown state reached.

In the process described so far, the peel force acting on the chain 11 must be just so large that the stitching process proceeds without error. Special attention deserves in this context, the insertion of the weft 19. This will be like FIG. 5 and 6 show, in each case before or on the last generated half-stitch 50 filed. The special shape of the needle 26, in particular the effect of their float projection 40, ensures that the weft thread 19 is directed to the desired location. This is in FIG. 7 again separately illustrated. The deposited by the thread guide part of the weft thread 19 can impinge, for example, approximately at the level of the longitudinal central axis A or slightly above it, on the ramp 41 of the Flottiervorsprungs 40. When expelling the needle 26 in the direction of the arrow 51, the weft thread 19 slides into its desired position on the half-stitch 50. This movement of the weft thread 19 is in FIG. 7 indicated by an arrow 52. The desired position of the weft thread 19 is indicated by a dashed circle 53.

Thus, the correct operation of the stitch formation system is ensured even if very dense knit fabric to be produced or, for example, the half-stitch 50 is very small due to only low withdrawal voltage. The weft thread 19 is guided by the floatation projection 40 in any case to its desired position. The needle 26 thus has a large weft catching area which enables safe and low-wear operation of the crochet galloon machine.

A Häkelgalonmaschinennadel 26 according to the invention is provided on its outer hook side 39 with a Flottiervorsprung 40, the tip 43 is preferably disposed above the central axis A of the needle 26. This needle 26 has an enlarged weft catching area and is therefore particularly suitable for producing dense knitwear. It also allows working with reduced withdrawal tension and possibly also with reduced weft tension. This contributes to increasing the service life of all system parts.

LIST OF REFERENCE NUMBERS

10

knitwear

11

First mesh chain

12

Second mesh chain

13

Third stitch chain

14

Fourth mesh chain

15

First basic thread

16

Second thread

17

Third basic thread

18

Fourth basic thread

19

weft

20

warp

21

guide needles

22

First Barre

23

guide needles

24

Second Barre

25

thread guides

26

Needle (s)

27

needle bed

28

shaft

A

central axis

29

Stitch forming part

30

Lower narrow side

31

Needle top

32

Checkpoint

33

hook

34

inner space

35

extension

36

hook head

37

Hook inside

38

Focus

39

Hook outside

40

Flottiervorsprung

41

ramp

42

top

43

top

44

intersection

45

location

46

leg

47

The End

48

flank

49

flank

50

half stitch

51

arrow

52

arrow

53

Circle - weft set position

54

needle channel

55

56

57

58

59

60

Claims (10)

Crochet galloon needle (26)
a shaft (28) having at one end a hook (33) with a hook head (36) which merges into a resilient leg (46) terminating in a hook interior (34),
the hook head (36) having a hook inside (37) facing the hook interior (34) and a hook outside (39) facing away from the shank (28),
wherein on the hook outer side (39) a floatation projection (40) is formed. Häkelgalonmaschinennadel according to claim 1, characterized in that the hook inner side (37) around a center (38) is curved in a circular arc. Häkelgalonmaschinennadel according to claim 1, characterized in that the Flottiervorsprung (40) is arranged above a hook center. The crochet galloon needle according to claim 1, characterized in that the floatation projection (40) has a straight ramp (41) extending from a tip (43) of the floatation projection (40) to a lower narrow side (30) of the needle (26). A crochet galloon needle according to claim 1, characterized in that the floatation projection (40) has a straight top (42) extending from a point (43) of the floatation projection (40) extends towards the leg (46). Häkelgalonmaschinennadel according to claim 4 or 5, characterized in that the tip (43) is rounded. A crochet galloon needle as claimed in claims 2, 4 and 5, characterized in that a straight line applied to the top (42) and a straight line applied to the ramp (41) intersect each other at a point (44) passing above one through the center (44). going center axis (A) is located. Häkelgalonmaschinennadel according to claim 1, characterized in that the Flottiervorsprung (40) has flat edges (48, 49). Häkelgalonmaschinennadel according to claim 8, characterized in that the flat edges (48, 49) are aligned parallel to each other. A crochet galloon needle according to claim 2, characterized in that the floating projection (40) has flanks (48, 49) which converge toward the tip (43) and towards each other.

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