EP0282647B1 - 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 and knitting machines, according to the preamble of patent claim 1 or patent claim 2.

“Knitting tools” are to be understood here as tongue needles, point needles, pusher needles, needles without tongue, for example plush hooks for the manufacture of plush goods, and sinkers.

From DE-PS 33 14 809 a punched knitting tool for knitting or warp knitting machines is known, the shaft of which has at least one foot and at least two guide parts continuous from the upper edge of the shaft to the lower edge of the shaft, one of which is arranged below the foot. Both guide parts are connected by at least one narrow web with a maximum height of 1.1 mm, through which a free space is limited together with the guide parts. This space is filled with a vibration-damping material that is firmly attached to the Needle shaft is connected. The vibration-damping material is usually an elastic plastic material with high damping properties, but the use of other materials is not excluded.

The arrangement can be such that the space delimited by a narrow web together with the guide parts opens to the lower edge or upper edge of the shaft or that two adjacent guide parts are connected to one another by two such narrow webs of a maximum height of 1.1 mm, so that the Free space is completely enclosed by the webs and the guide parts. Embodiments with one or more free spaces are described.

Such needles have already proven their worth in practice. In particular over long periods of operation and / or at very high working speeds, it has been shown that the vibration behavior of these knitting tools, which have been broken down into a highly elastic structure with web heights of at most 1.1 mm, is advantageously influenced by the vibration-damping material contained in the space. As practical experience has shown, web breaks due to material fatigue or hook breaks have not occurred to any appreciable extent after a long period of operation or at high working speeds.

The vibration-damping material filling the free space can only develop its effect if it is firmly attached along the edge of the free space the shaft material is connected. Particularly in the case of very fine knitting tools, ie knitting tools whose shaft thickness is very small, the area of the edge of the space delimiting the free space and available for the bond between the shaft material and the vibration-damping material is also very narrow. Especially when such needles work in knitting or warp knitting machines, in which they are driven out of the needle bed to such an extent that they protrude beyond the needle bed with a space filled with vibration-damping material in the fully driven position, the needle shaft in the area of the free space can be considerable Be exposed to side forces. If these side forces are so great that they cause a significant deflection of the needle shaft transversely to the longitudinal axis of the needle, the bond between the vibration-damping material filling the free space and the web and guide sections that line the free space is subjected to very high loads. If the vibration-damping material then detaches itself from the edges of the free space after longer periods of operation at individual points or even breaks out in places, the vibration-damping property of the filling of the free space is impaired, which can lead to the now more or less undamped transverse bending vibrations in the web areas of the needle lead to material fatigue on the highly elastic needle elements as the operating time progresses.

The object of the invention is therefore to remedy this situation and a knitting tool of the type mentioned to create, in which an inadvertent loosening of the binding of the material to the web or guide partial surfaces surrounding the free space is prevented even in the case of very high loads in the area of at least one free space filled with vibratable material.

To achieve this object, the knitting tool according to the invention is characterized in that the web and / or guide sections that line the free space have a profiling by means of which the vibration-damping material is anchored in a form-fitting manner.

The profiling results on the one hand in an enlargement of the surface areas available for binding between the filling of the free space and the surrounding needle parts, on the other hand the positive anchoring of the material filling the free space by the profiling results in a much better introduction of any bending stresses that may occur into the free space filling and a relief of the Binding surfaces between the filling and the surrounding needle parts. This ensures that even with very fine knitting tools of the aforementioned highly elastic design, in which two guide parts are connected to one another by at least one narrow web of at most 1.1 mm in height, over long operating periods and at high working speed, the vibration-damping properties of the filling of the free space are ensured (or the free space) is perfectly preserved.

The invention is preferred for such highly elastic needles, but their application is not limited to this narrow area. For example, from JP-GM 57-9433 it is known to provide normal latch needles in the solid openings adjacent to the needle foot, which are closed to the back of the shaft, or an opening which opens towards the back of the needle and which is provided with a vibration-absorbing material, for example felt or a synthetic resin, are filled. The purpose of this measure is preferably to prevent roll movements of the needle in the needle channel, which can be triggered by the control impacts exerted on the needle foot.

Even in the case of such needles or in general in the case of knitting tools in which, for other reasons, at least one free space in the form of a closed or open-edged recess is provided, which is filled with a heterogeneous material, the aforementioned object can be achieved according to the invention in that the free space seaming shaft areas have a profile by means of which the heterogeneous material is anchored in a form-fitting manner.

It has proven to be advantageous if the profiling has cutouts open to the edge towards the free space. Both for manufacturing reasons and with regard to the stability of the narrow webs in the case of highly elastic needles, it is expedient if the cutouts are part-circular, in which case they can advantageously be arranged next to one another in an overlapping or tangential manner (at one point). For certain dimensions and constructions of knitting tools, in particular with regard to production, it may alternatively also be preferable for the cutouts to be arranged next to one another at a distance, a distance of approximately 0.1 mm _ measured along the edge of the free space _ having often proven to be sufficient .

In a preferred embodiment, the profiling can have areas of reduced wall thickness which protrude into the material filling the free space and form their own "anchors" there, which are embedded in the material filling the free space and thus provide additional security against premature loosening.

These areas of reduced wall thickness can extend like strips around the free space _ or a part of the same _, but it is particularly advantageous if they are localized and projecting into the free space. In the embodiment mentioned, in which the profiling has adjacent cutouts, it has proven to be particularly expedient if the regions of reduced wall thickness comprise the gusset-shaped parts formed at the transitions between adjacent cutouts.

The areas of reduced wall thickness can be formed by depressions which, starting from opposite sides, extend symmetrically to the longitudinal center plane of the shaft, so that the parts of reduced wall thickness which act as "anchors" are completely enclosed on both sides by the material filling the free space to the same extent.

In practice it has proven to be advantageous if the remaining wall thickness in the areas of reduced wall thickness is approximately equal to half the thickness of the shaft.

Finally, it is conceivable that the areas of reduced wall thickness contain openings which are filled with the vibratable material and thus still effect rivet-like cross connections between the material and the surrounding shaft parts.

In particular in the case of open spaces open to the edge, the binding of the vibration-damping material to the shaft of the knitting tool is further improved if the profiling extends over the entire length of the shaft regions delimiting the free space. In the case of the highly elastic needles explained at the outset, this means that the profiling extends over the entire length of the web and additionally includes the sides of the guide parts facing the respective free space.

In principle, however, embodiments are also conceivable in which the profiling is provided only over part of the boundary of the respective free space.

• Fig. 1 eine Zungennadel gemäß der Erfindung, in einer ersten Ausführungsform, in einer schematischen Seitenansicht,
• Fig. 2 eine Zungennadel gemäß der Erfindung, in einer zweiten Ausführungsform, in einer schematischen Seitenansicht,
• Fig. 3 eine Zungennadel gemäß der Erfindung, in einer dritten Ausführungsform, in einer schematischen Seitenansicht,
• Fig. 4 die Zungennadel nach Fig. 1, in einem den mit einem schwingungsdämpfenden Material gefüllten Freiraum veranschaulichenden Ausschnitt, in einer Seitenansicht und in einem anderen Maßstab,
• Fig. 5 die Zungennadel nach Fig. 2, in einer Ausschnittsdarstellung entsprechend Fig. 4 und in einem anderen Maßstab,
• Fig. 6 einen Ausschnitt einer Zungennadel ähnlich Fig. 4, unter Veranschaulichung einer abgewandelten Ausführungsform der Profilierung des Freiraums, in einer Seitenansicht,
• Fig. 7 einen Ausschnitt der Zungennadel nach Fig. 4, unter Veranschaulichung einer weiteren abgewandelten Ausführungsform der Profilierung des Freiraums, in einer Seitenansicht, und
• Fig. 8 die Zungennadel nach Fig. 7, geschnitten längs der Linie VIII-VIII der Fig. 7.

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

• 1 shows a tongue needle according to the invention, in a first embodiment, in a schematic side view,
• 2 a latch needle according to the invention, in a second embodiment, in a schematic side view,
• 3 shows a tongue needle according to the invention, in a third embodiment, in a schematic side view,
• 4 shows the tongue needle according to FIG. 1, in a section illustrating the free space filled with a vibration-damping material, in a side view and on a different scale,
• 5 shows the tongue needle according to FIG. 2, in a detail representation corresponding to FIG. 4 and on a different scale,
• 6 shows a section of a latch needle similar to FIG. 4, illustrating a modified embodiment of the profiling of the free space, in a side view,
• 7 shows a section of the latch needle according to FIG. 4, illustrating a further modified embodiment of the profiling of the free space, in a side view, and
• 8 shows the latch needle according to FIG. 7, cut along the line VIII-VIII of FIG. 7.

The latch needles shown in FIGS. 1 to 3 each have a head or hook 1, which is followed by a neck 2, which merges into the needle face 3, in the area of which a longitudinal slot is arranged in the usual manner, in which a needle tongue 4 is pivotally mounted. The tongue bearing is indicated at 5.

Connected to the throat designated 6 is the shaft 7, which carries a needle foot 8 and which can additionally (FIG. 3) be provided with a pattern foot 9.

Below the needle foot 8 there is a continuous guide part 10 from the upper edge of the shaft to the lower edge of the shaft, which for better clarity is limited by two dashed lines in FIG. 1. A corresponding continuous guide part is also provided in the embodiment according to FIG. 3 below the pattern foot 9.

A second such guide part 10, which is, however, much narrower, adjoins the throat 6.

In the embodiment according to FIG. 1, there is an elongated free space 11 in the shaft 7 between the two guide parts 10, with its longitudinal axis oriented parallel to the needle shaft symmetry line. The free space 11 is narrow at the top (needle top) and bottom (needle back) Bridge 12 limited, the height of which is at most 1.1 mm.

In the free space 11 delimited by the two guide parts 10 and the two narrow webs 12, an elastic, vibration-damping material 13 is arranged, which is firmly connected to the shaft material surrounding it. This vibration-damping material is in particular a plastic material; however, other elastic materials, including metals, for example aluminum, can also be used for this purpose.

The embodiments according to FIGS. 2, 3 differ from those according to FIG. 1 in that several elongated free spaces 11 are formed in the shaft 7. Each of the free spaces 11 is filled with the vibration-damping material 13, which is firmly connected to the edge of the shaft material.

In contrast to the embodiments according to FIGS. 1, 3, in the embodiment according to FIG. 2, each of the two free spaces 11 provided in the needle shaft 7 is not closed, but is open at the edge and arranged such that it faces the back of the shaft (needle back) or opens to the top of the shaft (top of needle). Each of the two free spaces 11 is in turn delimited on one side by a narrow web 12 of a maximum height of 1.1 mm and on the other two sides by a guide part 10, the guide part 10 adjacent to the throat 6, as in the drawing illustrates, in its width dimension preferably corresponds approximately to the height of the subsequent web 12, which, incidentally, also applies to the embodiments according to FIGS. 1, 3. The guide parts 10, which can be of different widths, are arranged between them in the presence of a plurality of free spaces 11 (FIG. 3).

The details of the design of the edges of the free spaces 11 and that of the connection between the vibration-damping material 13 and the surrounding shaft material can be seen in particular from FIGS. 4 to 8:

The areas of the webs 12 and / or the guide parts 10 that line the free space 11 have a profiling 15 by means of which the vibration-damping material 13 is anchored in a form-fitting manner on the shaft material surrounding it.

As can be seen from FIGS. 4 to 7, the profiling 15 has, in the exemplary embodiments shown, recesses 16 which are open towards the edge and which are formed in the form of a part circle. The recesses 16 which are arranged next to one another in a sequence are overlapping one another in FIGS. 4, 5 and 7, such that two adjacent recesses 16 at the transition point 17 enclose an essentially helical or triangular region 18, which ends in an edge 190.

In the embodiment according to FIG. 6, on the other hand, the arrangement is such that the part-circular recesses 16 are arranged at such a distance from one another that straight edge parts 180 remain between them, the length of which — measured along the edge of the free space 11 — generally does not needs to be larger than approx. 0.1 mm.

The part-circular design of the recesses 16 shown has proven to be particularly advantageous in particular with regard to the manufacturing possibilities. In principle, however, other configurations of the cutouts 16 are also conceivable; The cutouts 16 could, for example, be polygonal or undulating, or dovetail-shaped.

In order to further improve the positive fit between the vibration-damping material 13 filling the free space 11 and the surrounding shaft parts, the profiling 15 can have areas of reduced wall thickness which protrude into the material 13 filling the free space 11. A preferred embodiment of this type is shown in FIGS. 7, 8:

The areas of reduced wall thickness designated by 19 are localized and projecting into the free space 11. They lie at the transitions 17 between adjacent cutouts 16 and encompass the gusset or triangular regions 18. They form thus approximately cone-shaped "anchors", which are embedded in the vibration-damping material 13 and additionally support it.

As can be seen from Fig. 8, these areas 19 are of reduced wall thickness, i.e. the "anchors" mentioned, starting from opposite sides, are formed by depressions 20 embossed into the webs 12, which extend symmetrically to the longitudinal median plane of the shaft 7 indicated at 21 in FIG. 8, such that the regions 19 of reduced wall thickness also symmetrically the longitudinal center plane 21.

The remaining wall thickness 22 in these areas 19 of reduced wall thickness is approximately equal to half the thickness of the shaft 7 in the embodiment shown. The "anchors" formed by the areas 19 are therefore covered on both sides by layers of the same vibration-damping material 13.

In particular in the case of an open space 11 which is open at the edge, as illustrated in FIG. 5, it is expedient that the profiling 15 extends over the entire length of the web 12 and includes the sides of the guide parts 10 facing the free space 11. However, it is also conceivable that, as already mentioned earlier, the profiling 15 is only provided over part of the outline of an open space 11 which is open or closed.

In order to further improve the positive connection between the vibration-damping material 13 and the surrounding shaft material, in all or in individual areas 19 of reduced wall thickness perforations, as indicated in FIG. 7 at 23, are provided, which, filled with vibration-damping material, produce a kind of cross rivet between the material areas lying on both sides of the anchors.

Finally, it should be mentioned that the regions 19 of reduced wall thickness need not be locally limited, as shown in FIG. 7. Embodiments are also possible in which such an area extends like a strip over the entire outline - or a part thereof - of a free space 11. This is illustrated in dashed lines at 19a in FIG. 6.

The exemplary embodiments described above with reference to FIGS. 1 to 8 relate to needles, the free spaces 11 of which are delimited by narrow webs 12 with a height of at most 1.1 mm and guide parts 10. The material filling the free spaces 11 has a vibration-damping effect for the highly elastic structures thus created.

In principle, however, such a profile 15 can also be used quite generally in the case of knitting tools, the shank of which has free-forming, open-edged or closed openings or recesses, the free spaces then being filled with a heterogeneous material, for example plastic material, which is firmly attached to the edge of freedom is connected. This material can be a plastic material which has been provided, for example, with a view to improving the bearing properties of the needle shafts in the needle guide grooves of the needle bed.

Claims (14)

1. A stamped knitting tool for textile machines, more particularly machines for knitting by any process, having a shank having at least one butt and two guide portions extending continuously from the top edge to the bottom edge of the shank, of which one guide portion is disposed below the butt, the said two portions being interconnected by at least one narrow web having a maximum height of 1.1 mm cooperating with said guide portions to bond an opening which is filled with a vibration damping material firmly bonded to the needle shank, characterized in that zones of the web and/or guide portions bordering the opening (11) have a profile (15) via which the vibration-damping material (13) is positively anchored.

2. A stamped knitting tool for textile machines, more particularly for knitting by any process, having a shank having at least one butt and a shank formed with at least one opening which is closed or open at its edges and filled with a heterogeneous material, for example a plastics material, firmly bonded to the needle shank, characterized in that zones of the shank bordering the opening (11) have a profile (15) via which the heterogeneous material (13) is positively anchored.

3. A knitting tool according to claims 1 or 2, characterized in that the profile (15) has recesses (16) with open edges in the direction of the opening (11).

4. A knitting tool according to claim 3, characterized in that the recesses (16) are part-circular.

5. A knitting tool according to claims 3 or 4, characterized in that the recesses (16) are disposed overlapping one another or one beside the other, tangentially contacting one another.

6. A knitting tool according to claims 3 or 4, characterized in that the recesses (16) are disposed at a distance (180) from one another.

7. A knitting tool according to claim 6, characterized in that the distance (180) between adjacent recesses (16) is greater than 0.1. mm, measured along the edge of the opening (11).

8. A knitting tool according to one of the preceding claims, characterized in that the profile (15) has zones (19) of reduced wall thickness which extend into the material (13) filling the opening (11).

9. A knitting tool according to claim 8, characterized in that the zones (19) of reduced wall thickness are locally defined and formed projecting into the opening (11).

10. A knitting tool according to claims 3 and 9, characterized in that the zones (19) of reduced wall thickness comprise gusset-shaped portions (18) formed at the transitions (17) between adjacent recesses (16).

11. A knitting tool according to one of claims 8 to 10, characterized in that the zones (19) of reduced wall thickness are formed by recesses (20) which, starting from opposite sides, extend symmetrically of the longitudinal central plane (21) of the shank (7).

12. A knitting tool according to one of claims 8 to 11, characterized in that the remaining wall thickness (22) in the zones (19) of reduced wall thickness is substantially equal to half the thickness of the shank (7).

13. A knitting tool according to one of claims 8 to 12, characterized in that the zones (19) of reduced wall thickness comprise perforations (23).

14. A knitting tool according to one of the preceding claims, characterized in that the profile (15) extends over the whole length of the shank zones bounding the opening (11).

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