EP0290805B1 - 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, with a shaft part which carries at least one foot and has at one end a recess which is open at the edge and which is laterally delimited by two webs, which on the side facing the recess in regions are provided with profiles, as well as with a working part, for example, a needle head or hook, which is fitted in the correct position in the recess of the shaft part with a correspondingly designed shaft-like connecting part which is also profiled in some areas on the edge side, the connecting part in a starting from the end face of the shaft part Guide area of the recess between the webs is positively guided and anchored in an adjoining anchoring area containing the profiles of the connecting part and the webs on the shaft part.

Among knitting tools there are latch needles, point needles, sliding needles, needles without tongue, for example to understand plush hooks for the manufacture of plush goods, as well as boards.

From US-PS 2431 635 a latch needle for knitting machines with the features listed above is known. In this latch needle, the needle foot and the needle hook are formed on separate shaft-like parts, namely the actual shaft part and a needle or general working part. These two parts are connected to one another in that an end region of the needle part forming a connecting part is pressed into a recess of the shaft part which is open towards the front and rigidly anchored therein by interlocking partial profiles of the connecting part and the shaft part. The purpose of this two-part design of the latch needle is to have an easy way to replace damaged needle or shaft parts with new ones without having to throw away the entire needle. For this reason, the connection between the needle and the shaft part is designed to be detachable in such a way that the connection part can simply be pushed out of the recess laterally. In addition to the fact that such disassembly and assembly of individual needle parts is no longer an option in view of the expensive workload for the user of a knitting machine needle, there is a risk with today's high-speed knitting machines that there is a rigid connection between the shaft and the needle part of that of the lock parts Vibrations originating in the foot of the shaft part, which are applied to the shaft part, reach the needle hook undamped and cause hook breaks there. On the other hand, the interlocking partial profiles of the connecting part and the webs delimiting the recess must be designed to be very closely tolerated in order to exclude with certainty the occurrence of even small play. Because of the tax shocks, such a game would quickly lead to a deflection of the profiles and thus to an insecure connection between the needle and the shaft part.

In addition, a latch needle for knitting machines is known from DE-PS 26 10 078, in which the needle foot and needle head are formed on separate needle shaft parts which are connected to one another via damping intermediate members. For this purpose, the arrangement is such that the needle shaft parts abut one another along surfaces which run in the displacement direction of the latch needle and are connected to one another by interlocking dovetail-like connecting elements. Here, between the non-extending in the longitudinal direction of the opposing surfaces of these connecting elements of the two needle shaft parts, elastic intermediate members are arranged, which consist of a synthetic rubber and are either held by a simple positive fit between the coupled needle shaft parts or are only firmly anchored on one end of the two needle shaft parts. Because of the low Shaft thickness and height (cross-section, for example, 0.6 mm² with an average needle size) and the small cross-sectional area determined by these dimensions, especially in the case of fine needles, makes it reliably problematic to hold the rubber intermediate members between the coupled shaft parts. There is also the danger that the highly elastic intermediate rubber members are so plastically deformed during the knitting process during the knitting process, that is to say, for example, that the working length of the overall needle undergoes a dynamic change which leads to an uneven stitch pattern of the knitted fabric.

In practice, a large number of different variants are used, for example for knitting machine needles but also for sinkers and other knitting tools, which are used depending on the respective intended use and the particular type and type of machine. This variety of variants requires considerable effort on the part of the manufacturer, not least with regard to warehousing.

The object of the invention is to remedy this and to create a punched knitting tool for textile machines, in particular high-speed knitting and knitting machines, which, by dividing it into a shaft part and a working part, allows the number of elements to be produced separately and kept in stock thereby reduce that work and shaft parts according to the the respective knitting tool variants are combined with one another by the manufacturer and are elastically connected to one another in such a way that the resulting knitting tool can be used reliably over long operating periods free of permanent breaks, for example needle head or hook breaks.

To achieve this object, the knitting tool mentioned at the outset is characterized according to the invention in that at least one free space is formed in the anchoring area between the connecting part and the adjacent edge of the recess, and in that the free space is filled with a vibration-damping material which is inseparably connected between the connecting part and the Shaft part is firmly anchored to the connecting part and the shaft part.

In this knitting tool, the needle part in the guide area of the recess of the shaft part is guided precisely in the correct position, while at the same time the vibration-damping material filling the free space ensures that no vibrations from the control parts exerted on the foot by the lock parts are undamped to the end of the working part, for example the needle head. Since the webs of the shaft part and the connecting part of the working part are profiled on the edge side in the anchoring area, the vibration-damping material filling the free space is properly anchored to the shaft and the connecting part, the Profilings result in an additional positive anchoring of the vibration-damping material.

In a preferred embodiment, the arrangement is such that the connecting part in the anchoring area is surrounded by the free space essentially along its entire periphery, so that a large anchoring surface is available for the vibration-damping material. The elastic properties can also be adapted to the respective operating conditions by suitable dimensioning of the free space filled with the vibration-damping material.

It has proven to be advantageous if the profiles of the connecting part and / or of the webs have regions of reduced wall thickness which protrude into the material filling the free space. These areas of reduced wall thickness can border the associated edges of the connecting part and / or of the webs in a strip-like manner, but it is particularly advantageous if they are designed to be local. For this purpose, the areas of reduced wall thickness can also be formed by bead-like depressions which, starting from opposite sides, are arranged symmetrically to the longitudinal center plane of the shaft part and thus result in additional anchoring surfaces for the vibration-damping material extending into and filling the depressions.

In order to increase the stability of the connection of the working part and the shaft part, it is expedient for the working part to have integrally formed shoulders with which it lies flush against the end face of the shaft part. The webs of the shaft part can also be positively connected to the shoulders of the working part, in order to achieve additional retention of the webs on the working part in the region of the web ends. In a practical embodiment, the shoulders can have cutouts into which the webs or parts formed thereon engage.

It is also advantageous if the shoulders above and below are aligned with the upper and lower edge of the shaft part, so that abrupt transitions in the area of the connection point are excluded, which could impair the easy sliding of the needle in the needle bed or trigger dirt accumulation.

The vibration-damping material is usually a plastic or a synthetic resin, which ensures a firm adhesive connection on the corresponding anchoring surfaces of the guide part and the webs or the profiles.

The guide part is particularly advantageously delimited laterally with parallel flanks, at least in the guide region, the webs of the shaft part having a height of at most 1.1 mm and thus being distinguished by a particularly high elasticity. As practical experience has shown, this extremely narrow design of the webs makes it particularly effective Achieve damping of the vibrations introduced on the foot. It is advantageous if the axial length of the guide area is at least 1/5 of the axial length of the recess.

Finally, in an advantageous embodiment, the connecting part in the part lying in the anchoring area can be tapered in height compared to the part lying in the guide area, in order to create the free space absorbing the vibration-damping material. Optionally, however, an arrangement is also conceivable in which the recess in the anchoring area is widened in relation to the guide area towards the upper and / or lower edge of the shaft part.

Especially in applications where it must be expected that considerable lateral forces act on the working part, as is the case, for example, with transfer needles, it may be expedient that the arrangement is such that the working part with the shaft part in the Guide area and / or an area adjacent to it is welded at least in places.

The welding of the working part to the guide part, which is preferably carried out by means of a laser, reliably precludes the forces acting laterally from pushing the working part in the guide area out of the associated recess of the shaft part. In spite of this welding, which increases the stability of the knitting tool, if necessary in places, the described advantages of such a two-part knitting tool are retained. this applies in particular also for the vibration-damping effect of the vibration-damping material filling the free space.

• Fig. 1 eine Zungennadel gemäß der Erfindung, in einer Seitenansicht,
• Fig. 2 die Zungennadel nach Fig. 1, in einem Ausschnitt im Bereiche der Verbindungsstelle zwischen dem Arbeits- und dem Schaftteil, in einer Seitenansicht und in einem anderen Maßstab,
• Fig. 3 die Zungennadel nach Fig. 2, geschnitten längs der Linie III-III der Fig. 2, und
• Fig. 4 die Zungennadel nach Fig. 2, geschnitten längs der Linie IV-IV der Fig. 2.

In the drawing, an embodiment of the object of the invention is shown. Show it:

• 1 is a tongue needle according to the invention, in a side view,
• 2, the latch needle according to FIG. 1, in a cutout in the area of the connection point between the working and the shaft part, in a side view and on a different scale,
• Fig. 3, the latch needle of Fig. 2, cut along the line III-III of Fig. 2, and
• 4 shows the latch needle according to FIG. 2, cut along the line IV-IV of FIG. 2.

The knitting tool shown in FIG. 1 in the form of a tongue needle, punched out of a corresponding thin steel sheet, has a shaft part 1 which carries a foot 2 on its upper side and forms the so-called demonstration at 3 and the so-called tracking of the needle shaft at 4. With the shaft part 1, a separate needle or working part 5 is connected, which is shaft-like at 6 and then carries at its end a molded needle hook 7, to which a needle tongue 8 is assigned, which at 9 in the usual tongue slot around a transverse one Tongue axis is pivotally mounted.

As can be seen in particular from FIG. 2, a shaft-like or peg-like connecting part 10 is formed on the needle part 5 at the end opposite the hook 7, which has a substantially rectangular shape and with its longitudinal axis 11 parallel to the back 12 of the needle part 5 is aligned. In the embodiment shown, the needle part 5 is vertically offset with its longitudinal central axis 13 with respect to the axis 11 of the connecting part 10. Embodiments are also conceivable in which the two axes 11, 13 are aligned with one another. On both sides of the connecting part 10, two shoulders 14 are formed on the needle part 5 and extend approximately at right angles to the edge of the connecting part 10, to which two approximately part-circular recesses 15 are connected in the transition area to the connecting part 10.

In the shaft part 1, a recess 17 open towards the end face 16 is formed, which is delimited on both sides by two webs 18. The two webs 18 have a height indicated at 19 of at most 1.1 mm; they are of equal height, so that the elongated recess 17 is symmetrical about the longitudinal center line of the shaft part 1.

Starting from the end face 16, the recess 17 has a guide region 20 which is delimited by two mutually opposite and mutually parallel border parts 210 of the webs 18, to which correspondingly parallel smooth border zones 22 of the connecting member 10 are assigned. The arrangement is such that the connecting member 10 is fitted into the recess 17 without play in the guide area 20, the shoulders 14 of the needle part 5 being flush with the end face 16 of the shaft part 1, i.e. in the assembled state. more precisely of the webs 18, and the webs 18 engage in the recesses 15 in a form-fitting manner with projections 240 arranged at the ends and designed in accordance with the profile shape of the recesses 15.

Subsequent to the guide region 20, the recess 17 has an anchoring region 21, in which the webs 18 are formed with a profile 24 on their inner sides facing the recess 17. This profiling 24 is composed of a mutually adjoining arcuate profile sections 25, which the edge of the Give recess 17 in the anchoring area 21 an approximately garland jagged shape. At the intersection of adjacent profile sections 25 there are locally limited areas of reduced wall thickness, which are formed by bead-like depressions 26, which have an approximately gusset shape and, starting from opposite sides, are arranged symmetrically to the longitudinal center plane of the shaft part 1.

The connecting part 10, in its assembled state in the anchoring area 21, is also formed with an edge-side profiling 27, which in the illustrated embodiment consists of arcuate profile sections 28 arranged next to one another, which also starts from opposite sides and is recessed and symmetrical to the longitudinal center plane of the Connecting part 10 and the shaft part 1 are arranged horizontally.

Between the connecting part 10 and the webs 18 there is a free space 29 in the anchoring area 21 which, as can be seen from FIG. 2, surrounds the connecting part 10 in the anchoring area 21 essentially along its entire periphery. This free space 29 is filled with a vibration-damping material 30, which consists of a plastic or a synthetic resin and with the boundary surfaces delimiting the free space 29 as well as those formed by the profiles 17, 27 Anchoring surfaces is firmly connected. The vibration-damping material 30 overlaps the regions of reduced wall thickness (at 26, 28) of the webs 18 and the connecting part 10 formed by the depressions, whereby an additional positive anchoring is achieved between the vibration-damping material 30 and the webs 18 and the connecting part 10, as is evident from FIGS. 3, 4.

In order to enlarge the free space 29, the connecting part 10 is formed in the anchoring area 21 with a lower height than in the guide area 10, which is indicated at 31 in FIG. 2. At the same time, the arcuate profile sections 25 in the anchoring area 21 adjoining the guide area 20 form an extension of the recess 17 towards the upper and lower edge of the shaft part 1.

The shoulders 14 are formed on the needle part 5 such that a subsequent upper edge 32 and the back 12 of the needle part 5 are aligned with the upper and lower edge of the shaft part 1 (see FIG. 2), so that there is a connection between the needle part 5 and the shaft part 1 does not result in an abrupt paragraph.

In addition, the axial length of the guide area 20 Dimensioned so that it is at least 1/5 of the total axial length of the recess 17.

The shaft part 1 and the needle part 5 are manufactured separately, the arrangement and design of the foot 2 _ or possibly several feet _ of the demonstration 3, the tracking 4 etc. of the shaft part 1 and the shaft area 6 and the needle head including the tongue 9 of the needle part 5 are designed according to the circumstances of the respective needle variant. Only in the area of the recess 17 and the connecting part 10 are the shaft part 1 and the needle part 5 of the same design.

At the manufacturer, different shaft and needle parts 1 and 5 can now be combined with each other according to the desired needle variant with the same working length. All that is required is for the respective needle part 5 with its connecting part 10 to be inserted into the recess 17 of the associated shaft part 1 and to be anchored therein by the fact that the vibration-damping material 30 is introduced into the free space 29. The edge surfaces 210, 22 of the webs 18, which are held together in the recesses 15 in a form-fitting manner in the guide region 20 without play, ensure exact guidance of the needle part 5 on the shaft part 1, whereby one should also do so by the flush abutment of the shoulders 14 on the end faces 16 of the shaft part 1 exactly the same working length of all needles is ensured. The vibration-damping material 30 surrounding the connecting part 10 in the anchoring region 21 in the free space 29 ensures that shock waves introduced at the foot 2 are damped and cannot lead to a breakage of the needle hook 7. This effect is supported by the extremely low webs 18. The explained design of the guide area 20 ensures that the precise guidance of the needle part 5 on the shaft part 1 is always maintained.

In cases in which considerable lateral forces are exerted on the needle part 5 during operation, which, based on FIG. 2, come into effect at right angles to the paper plane, additional precautions may occasionally be indicated against the needle part 5 with its connecting part 10, in particular in that Guide area 20 is pivoted laterally out of the recess 17. This would mean that the edge surfaces 210, 22 partially separate from one another. The webs 18 would thus also come free from the cutouts 15 and would no longer be held together in a form-fitting manner.

In order to avoid this, the needle part 5 and the shaft part 1 can be welded to one another in the guide region 20 and / or in the region of the shoulders 14 and end faces 16 and the recesses 15, if necessary at points or in places. Laser welding is particularly suitable for this. This measure does not significantly influence the flexibility of the webs 18 over the length of the anchoring region 21, so that the effect of the vibration-damping material in the recess 17 is retained. The weld is indicated at 33 in Fig. 2.

Claims (15)

1. A stamped knitting tool for textile machines, more particularly for knitting by any process, having a shank portion which bears at least one butt and is formed at one end with a recess open at the edge in the direction of the end face and bounded laterally by two webs having profiles in zones on the side adjacent the recess, and a working portion which bears, for example, a needle head or needle hook and is fitted in the correct position via a correspondingly shaped shank-like connecting portion, also profiled in zones on the edge side, into the recess in the shank portion, the connecting portion being positively guided between the webs in a guide zone of the recess extending from the end face of the shank portion and being anchored to the shank portion in an anchoring portion containing the profiles of the connecting portion and the webs, characterized in that the anchoring portion (21) is formed with at least one opening (29) between the connecting portion (10) and the adjoining edge of the recess (17), and the opening (29) is filled with a vibration-damping material (30) which is firmly anchored to the connecting portion (10) and the shank portion (1), accompanied by the inseparable connection of the connecting portion (10) to the shank portion (1).

2. A knitting tool according to claim 1, characterized in that in the anchoring zone (21) the connecting portion (10) is enclosed substantially along its whole edge by the opening (29).

3. A knitting tool according to claims 1 or 2, characterized in that the profiles (27; 17) of the connecting portion (10) and/or the webs (18) have zones (28; 26) of reduced wall thickness which extend into the material (30) filling the opening (29).

4. A knitting tool according to claim 3, characterized in that the zones of reduced wall thickness (28; 26) are restricted to specific locations

5. A knitting tool according to claims 3 or 4, characterized in that the zones of reduced wall thickness are formed by bead-like depressions (at places (28; 26) which, starting from opposite sides, are disposed symmetrically in relation to the longitudinal central plane of the shank portion (1).

6. A knitting tool according to one of the preceding claims, characterized in that the working portion (5) has shaped-on shoulders (14) via which it bears flush against the end face (16) of the shank portion (1).

7. A knitting tool according to claim 6, characterized in that the webs (18) of the shank portion (1) are connected positively to the shoulders (14) of the working portion (5).

8. A knitting tool according to claim 7, characterized in that the shoulders (14) are formed with recesses (15) into which the webs (18) or portions (24) formed thereon engage.

9. A knitting tool according to claims 6 to 8, characterized in that the shoulders (14) are constructed aligned at the top and bottom with the top and bottom edges of the shank portion (1).

10. A knitting tool according to one of the preceding claims, characterized in that the vibration-damping material (30) is a plastics or a synthetic resin.

11. A knitting tool according to one of the preceding claims, characterized in that at least in the guide zone (20) the connecting portion (10) is bounded laterally by parallel flanks and the webs (18) of the shank portion (1) have a maximum height (19) of 1.1 mm.

12. A knitting tool according to one of the preceding claims, characterized in that the axial length of the guide zone (20) is at least one fifth of the axial length of the recess (17).

13. A knitting tool according to one of the preceding claims, characterized in that in the portion lying in the anchoring zone (21) the connecting portion (10) tapers in height in relation to the portion lying in the guide zone (20).

14. A knitting tool according to one of the preceding claims, characterized in that the recess (17) in the anchoring zone (21) adjoining the guide zone (20) is widened in the direction of the top and bottom edges of the shank portion (1) in relation to the guide zone (20).

15. A knitting tool according to one of the preceding claims, characterized in that in the guide zone (20) and/or a zone (14, 15, 240) adjacent thereto the working portion (5) is welded at least in places to the shank portion (1).

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