EP0719881B1 - Stamped knitting tool for textile machines, particularly for knitting machines - Google Patents

Description

The invention relates to a punched knitting tool for textile machines, in particular knitting or knitting machines, with a shaft that carries at least one foot and in which at least one free space is formed, which with a heterogeneous material, especially a plastic, is filled, which is firmly connected to the shaft.

Under "knitting tools" there are latch needles, Pointed needles, needles, needles without a tongue, for example Plush hook for the manufacture of plush goods and to understand boards and the like.

DE-PS 3 314 809 is a punched knitting tool of the type mentioned in the known At least one free space is arranged in Shape of an elongated hole is formed, the longitudinal axis aligned parallel or coaxial to the longitudinal axis of the shaft is. This slot is through two of the Upper shaft edge to the lower shaft edge vertical vertical Guide parts and two connecting them narrow webs bounded, arranged parallel to each other are. The clearance is with a vibration damping Material filled in firmly with the needle shaft connected is. This vibration damping material is usually made with an elastic plastic material high damping properties, but the use is not excluded from other materials. Embodiments with one or more of them the webs and the guide parts completely enclosed Free spaces are described.

Through the contained in the respective free space anti-vibration material will, like the practical Experience has shown the vibration behavior of the Knitting tools advantageously influenced. It is possible, the knitting tools into a highly elastic structure Bridge heights of at most 1.1 mm and the knitting tools over long periods of operation with high working speed to be used without resulting in web breaks Material fatigue or broken hooks to a significant degree would occur.

Since the vibration-damping filling the free space Material can only work if it is along the edge of the free space with the shaft material have been linked, especially in very thin and in operation in the area of such a free space lateral forces applied to bending Knitting tools also have additional measures positive anchoring of the plastic filling in the Free space met. This is the case with one from EP-A-0 426 994 A1 knitting tool of the shaft known to the applicant, starting from the upper and / or lower edge of the shaft, in its longitudinal direction at least in regions provided a slot-like depression through which the free space filled with the plastic is formed. The Recess can be created with slot cutters, which means gusset-like on the end faces of the recess Result material projections that have the shaft thickness and protrude into the open space. The manufacture of such slit-like Deepening is complex. It is also out of the EP-A1 0 282 647 and EP-A1 0 375 843 from the applicant known, the free space-bordering web and / or guide part Areas with profiling or with anchoring means shaped, cone-shaped or lobe-shaped To provide projections. The profiling can Have areas of reduced wall thickness that either arranged locally or afforded like all or part of the outline of the space can extend. These areas of reduced wall thickness protrude, just like the mentioned tabs and protrusions, into the plastic material filling the free space and contribute to its positive anchoring on the shaft at.

In practice it has been shown that the production of knitting tools, in particular needles, with free spaces, the marginally reduced with profiled areas Shaft thickness are formed, relatively difficult and is expensive. There are special ones for this training the anchorage of the plastic material Punching tools required, especially in the case of Bridges of low height provide limited space must be taken to warp the thin webs to prevent in manufacturing. Which is right-angled Areas of the shoulder adjoining the shaft Reduced shaft thickness can also at high dynamic loads on the knitting tools too local limited voltage peaks ("voltage nodes") lead that affect the life of the knitting tool.

The object of the invention is therefore to remedy this and to create a knitting tool of the kind described with a flawless with simplified production Anchoring the respective free space in the shaft filling heterogeneous material on the shaft guaranteed is.

To solve this task, the knitting tool according to the invention the features of claim 1.

The shaft is beveled along the edge of the free space, at least in places towards the free space, in such a way that the beveled areas extend in a wedge shape towards the longitudinal median plane of the shaft and protrude into the heterogeneous material filling the free space.
The bevel on the edge of the free space results in a secure external anchoring of the material filling the free space, in particular plastic. The chamfered areas can in particular be embossed into the shaft, which can be done with the aid of a simple, inexpensive stamp which has a long service life. Since the displaced material flows towards the free space during the embossing process, the unembossed shaft areas are not affected by the embossing process. This is particularly important if the space to the upper and / or lower edge of the shaft is limited by webs of low height, the cross-section of which is retained.

It is particularly advantageous if the bevelled Areas delimited to the free space by a fillet are the second internal positive anchoring the material filling of the free space even more Hold there. This fillet is used in the stamping process automatically generated because the shaft material is pushed inside towards the free space. Basically However, embodiments are also conceivable in which the Fillet differently, for example by cutting or through an infiltration is created.

The chamfered areas advantageously have both sides of the shaft have a substantially identical taper angle on, but are also embodiments conceivable, where for special reasons different Bevel angle provided or only a bevel is arranged on one side of the shaft.

Depending on the type and design of the knitting tool the beveled areas along the Outline of the free space to be local or yourself extend around the closed outline of the open space.

For example, in the case of knitting tools, the shank of which is mentioned above Way with at least one free space in shape an elongated hole is formed which to the upper shaft and bottom edge each by a web of low height is limited, the arrangement must be made so that bevelled Areas on the webs are available. The the connecting the two webs on the end face, in the Usually semicircular parts of the free space outline can at least in certain embodiments partly without bevels, i.e. unprocessed, be left if this is in view of a cheap Stress distribution in the shaft material expedient appears. Of course, it is also possible that the slanted areas are also all over this extend curved outline parts of the free space.

Especially with dynamically highly loaded knitting tools, like needles for high performance knitting machines it turned out to be advantageous from the curved ones Outlines or boundary areas of the free space at least to form an essentially elliptical, the Then bevels usually cover the whole extend curved area. This will make it more exciting Transition between the straight and the curved Part of the free space outline that leads to a particularly high dynamic resistance of the Knitting tool leads.

Further designs of the new knitting tool are the subject of subclaims.

Fig. 1 ein Strickwerkzeug gemäß der Erfindung in Gestalt einer Zungennadel, in schematischer Darstellung und in einer Seitenansicht,

Fig. 2 die Zungennadel nach Fig. 1 in der Draufsicht,

Fig. 3 die Zungennadel nach Fig. 1 unter Veranschaulichung eines offenen, d.h. nicht mit einem heterogenen Material gefüllten Freiraums, im Ausschnitt und in einem anderen Maßstab,

Fig. 4 die Zungennadel nach Fig. 3 geschnitten längs der Linie IV-IV der Fig. 3, in einem anderen Maßstab sowie im Ausschnitt,

Fig. 5 den Umriß des mit Anschrägungen versehenen Freiraums der Zungennadel nach Fig. 3 in einer vergrößerten Teildarstellung und im Ausschnitt,

Fig. 6 die Zungennadel nach Fig. 3 mit einem heterogenen Material ausgefülltem Freiraum in einer Darstellung entsprechend Fig. 3,

Fig. 7 die Zungennadel nach Fig. 6 geschnitten längs der Linie VII-VII der Fig. 6 in einem anderen Maßstab,

Fig. 8 die Zungennadel nach Fig. 1 in einer abgewandelten Ausführungsform im Ausschnitt und in einem anderen Maßstab und

Fig. 9 die Zungennadel nach Fig. 8 in einem vergrößertem Ausschnitt zur Veranschaulichung der Umrißgestalt eines Freiraumes.

Exemplary embodiments of the subject matter of the invention are shown in the drawing. Show it:

1 is a knitting tool according to the invention in the form of a latch needle, in a schematic representation and in a side view,

2 shows the top view of the latch needle according to FIG. 1,

3 shows the latch needle according to FIG. 1, illustrating an open space, ie a space not filled with a heterogeneous material, in the detail and on a different scale,

3 cut along the line IV-IV of FIG. 3, on a different scale and in the detail,

5 shows the outline of the chamfered free space of the latch needle according to FIG. 3 in an enlarged partial view and in a cutout,

6 shows the tongue needle according to FIG. 3 with a heterogeneous material filled free space in a representation corresponding to FIG. 3,

7 cut along the line VII-VII of FIG. 6 on a different scale,

Fig. 8 the latch needle of FIG. 1 in a modified embodiment in the cutout and on a different scale and

FIG. 9 the latch needle according to FIG. 8 in an enlarged detail to illustrate the outline shape of a free space.

The latch needle shown in FIGS. 1, 2 has a needle shaft 1, which is usually made of steel strip is punched out and two molded on top Feet 2 carries and on one side a needle head 3 connects with the needle hook 4. The one with the needle hook 4 interacting needle tongue is indicated at 5.

In the needle shaft 1 are in the illustrated Embodiment four in the axial direction from each other spaced through elongated holes 6 punched from which each forms a free space, which in the from the Fig. 6, 7 evident way with a heterogeneous material 8 is filled out. The heterogeneous material is with the Shank 1 along the edge of each slot 6 firmly connected. It’s usually made of a plastic, preferably a polyamide-12, polyurethane, polyethylene or polytetrafluoroethylene or the like, but are including non-organic substances, for example of a metallic type.

Each slot 6 is on its long sides by two parallel webs 9, 10 and on the end face two from upper shaft edge 11 to lower shaft edge 12 continuous guide parts 13 limited. Each foot is 2 each supported by one of the guide parts 13. The both on the upper needle shaft edge 11 and on the lower needle shaft edge 12 lying webs 9, 10 have a low height of preferably about 1.1 mm and less. Their length is advantageously more than 8 mm. At the in 1 to 7 embodiment shown is the Outline of each elongated hole 6 on the two webs 9, 10 adjacent long sides by essentially straight Lines 14, 15 delimited by two at the end faces semicircular curved lines 16, 17 connected together are, of which the associated in Fig. 3 Radius is indicated at 18.

Along the edge of each of one of the elongated holes 6 formed free space is the shaft 1 in sections beveled in towards the free space, like this 3 to 5 can be seen in particular. The narrow, strip-shaped, beveled areas are included 19, 20 designated. They are on both sides of the shaft 1 and have essentially the same everywhere Bevel angle 21 on the one shown Embodiment is 35 °. It can depend on the Shaft thickness 22 and the type of material used 8 as well as the operating conditions and conditions of the Knitting tool can also be chosen differently. With It is preferably in a range from approx. 10 to 80 °. The Bevel angle 21 can be on both sides of the shaft 1 also have different sizes, whereupon the For the sake of order. Finally, it should be mentioned that the bevels 19, 20 in the illustrated Embodiment in its extension each wedge-shaped to the longitudinal median plane indicated at 23 in FIG. 4 of the shaft 1 and run with their (imaginary) The apex line lies on this median plane. They are too Embodiments possible in which this (imaginary) Vertex line opposite the longitudinal median plane 23 to the one or the other side is offset. Can too the beveled areas 19, 20, which are in the present Traps are the same width, different from each other Have width.

4, 5 show that the beveled Area 19 on either side of the shaft essentially over the length of the two straight contour lines 14, 15 of the Elongated hole 6 and the semicircular connecting them curved contour line 17 of the elongated hole 6 extends, which is near the foot 2. At the opposite end of the elongated hole 6 ends beveled area 19 on both sides of the shaft at 25 in Axis direction slightly in front of the area in which the straight Outline 14 or 15 in the semicircular curved Outline 16 merges. The tapered area 20 extends then on both sides of the shaft over one Part of the semi-circular curved line 16, where he symmetrical to the elongated hole longitudinal axis indicated at 26 is arranged. By between the bevels 19, 20 subject to change, i.e. not beveled, shaft area at 27, there is a favorable influence on the im Operation occurring voltage distribution in the shaft 1. Embodiments are also conceivable in which such non-beveled areas in other places provided along the outline of the respective elongated hole 6 are. For example, in the area of the foot 2 facing end face a bevel 20 only over part of the length of the semi-circular curved outline 17 be present.

The identical, lying on both sides of the shaft 1, chamfered areas 19, 20 are towards the free space each bounded by a groove 27 which is arranged symmetrically to the longitudinal center plane 23.

The free space limited by each slot 6 is how already mentioned, with vibration-damping plastic material 8, which, as can be seen from FIG. 7, is flush with the two shaft side walls. The beveled Areas 19, 20 and the fillet 27 protrude into the material filling 8 into it and thus result in the the slot-bound plastic is a form-fitting Anchoring. The fillets 27 form one additional second anchoring means. They are too Embodiments conceivable in which preformed plastic parts pressed into the elongated holes 6 and in these are positively anchored on the edge.

The bevels in the beveled areas 19, 20 are stamped onto the shaft 1. For this purpose, one in FIG. 4 used at 28 indicated stamp, which in his Length is matched to the respective elongated hole 6 and the bevelled areas 19, 20 corresponding partially has circumferential bevels 29. In the in Fig. 4 by An arrow 30 indicated stamping process is the shaft material at the outline of the elongated hole 6 in each case pushed, the groove 27 forming at the same time. The practically the whole outline of the slot 6 enclosing beveled areas 19, 20 result in a excellent anchoring of the plastic 8, being a local breakout is prevented. The cross section of the two webs 9, 10 are retained during the stamping process and offers no break point approach. The latch needle thus has a very low coefficient of friction in the needle channel of the assigned needle bed.

8, 9 shown in detail modified embodiment extends the beveled Area 19 each over the entire closed Outline of the free space delimited by slot 6. Deviating from the embodiment according to FIGS. 1 to 7 but is the two straight contour lines 14, 15 on the front connecting semicircular outline 16 and 17 (which are indicated by dashed lines in FIG. 9 for comparison is) by an essentially partially elliptical Outline 17a replaced, the paragraph in the straight Outlines 14, 15 merges. Through this training better stress distribution when the latch needle is loaded in the area of the front ends of the free spaces achieved, which contributes to the fact that the webs 9, 10 at their ends a smoother change in cross-section at the transition to experienced elliptical outline 17a.

Contour lines 17a which are partially elliptically curved can be at each slot 6 may be provided on both end faces, however, it is often sufficient to have just one face train while on the other end partially circular outline 17 is used. The partially elliptical Outline 17a can be a foot 2 or the Needle head 3 (Fig. 1) facing.

Deviating from the illustrated exemplary embodiments are of course other embodiments of Knitting machine needles and knitting tools in general possible, for example, only a single foot 2 and / or have an elongated hole 6, the outline of the of the respective free space also deviating from an elongated hole can be designed, for example in a circular, slot, V-shape and the same.

Claims (9)

1. Stamped knitting tool for textile machines, in particular warp knitting or knitting machines, with a shank (1), which bears at least one butt (2) and in which at least one cavity (6) is formed which is filled with a heterogeneous material (8) firmly connected to the shank (1), whereby the shank slopes inwards towards the cavity at least in sections along the edging (14, 15, 16, 17, 17a) of the cavity, characterised in that in their extension, the sloping regions (19, 20) respectively taper in a wedge shape towards the longitudinal central plane (23) of the shank (1) and project into the heterogeneous material (8).
2. Knitting tool according to Claim 1, characterised in that the sloping regions (19, 20) are defined in the direction of the cavity (6) by a furrow (27).
3. Knitting tool according to Claim 1 or 2, characterised in that the sloping regions (19, 20) are impressed into the shank (1).
4. Knitting tool according to one of the preceding claims, characterised in that the sloping regions (19, 20) are arranged on both sides of the shank.
5. Knitting tool according to one of the preceding claims, characterised in that the sloping regions have essentially the same angle of slope (21).
6. Knitting tool according to Claim 5, characterised in that the angle of slope (21) lies between 10° and 80° and preferably amounts to approximately 35°.
7. Knitting tool according to one of the preceding claims with a cavity in the form of an elongated hole, which is defined in the direction of the upper and lower edge of the shank respectively by a web (9, 10) of low height, characterised in that the sloping regions (19) are present on the webs (9, 10).
8. Knitting tool according to one of the preceding claims, characterised in that sloping regions (19, 20) extend partially or completely in or over curved contour regions (17, 17a) of the cavity (6).
9. Knitting tool according to Claim 8, characterised in that at least one (17a) of the curved contour regions is essentially elliptic.

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