TWI821672B - Warp knitting machine, slide needle assembly and method for producing an elastic knitted article - Google Patents

Abstract

The present invention relates to a warp knitting machine with a plurality of slide needle assemblies, of which each comprises a slider (11) and a slide needle (3) with a needle head (8) and a needle stem (10), wherein the warp knitting machine has a maximum slide needle stroke of 10 mm. It was possible to achieve a high productivity of the warp knitting machine with good quality of the knitted article. For this purpose it is provided that the needle stem (10), at least at the end (15) of a sliding region at which the stitch is located at the end of a slide needle stroke movement, has a circumference which is at least as large as a largest circumference of the entirety of needle head (8) and slider (11) parallel thereto in the closed position.

Description

Warp knitting machine, slip needle assembly and method for producing elastic knitted fabrics

Field of invention

The invention relates to a warp knitting machine with a plurality of slip needle assemblies. Each slip needle assembly includes a slip plate and a slip needle with a needle head and a needle bar. The warp knitting machine has a maximum slip needle of 10 mm. journey.

In addition, the present invention relates to a sliding needle assembly of a warp knitting machine with a maximum sliding needle stroke of 10 mm, wherein the sliding needle assembly has a sliding needle and a sliding plate, the sliding needle has a needle head and a needle bar, and the sliding plate Works with slip stitch.

Finally, the present invention relates to a method for producing elastic knitted goods, in which loops of knitted goods are formed using several slip needle assemblies, each of which slip needle assemblies comprise a slide and has a needle and a Sliding needles of the needle bar with a maximum stroke of 10 mm.

Warp knitting machines with slip needle systems, ie with multiple slip needle assemblies, are characterized by particularly high production capacities. More than 4,000 yarn loops can be produced per minute. However, such high operating speeds lead to problems that are particularly noticeable when the supplied warp is flying up. This can result in loss of quality of the knitwear. This applies in particular to the production of elastic knitwear, where the warp supplied must have a certain elasticity.

Some problems can be reduced by optimizing the movement of the knitting tools. This is generally associated with a reduction in the size and time of movement of the knitting tools relative to one another. However, this often results in a limitation of the possible production spectrum of the knitwear produced.

The object of the present invention is to enable warp knitting machines to have high productivity and knitted products to have good quality.

This object is achieved in a warp knitting machine of the initially mentioned type, whereby the needle bar has a circumference at least at the end of the sliding area where the yarn loop at the end of the movement of the sliding needle stroke is located, which circumference is at least in contact with the needle head As large as the overall maximum circumference of the slide parallel to the needle in the closed position.

Slip stitches form knitting needles or working needles. When the yarn loop has been formed, it is located on the needle bar. Then, the slip needle rises so that the pleated space of the needle can catch the warp again and pass the warp through the formed loop of yarn. During this process, the slider closes the pleated space of the needle. By using a relatively "thick" needle bar, it is now achieved that the yarn loop no longer needs to be widened as the needle moves through the loop together with the slide that has closed the pleat space. Therefore, the "needle and slide unit" does not have a larger circumference than the needle bar on which the yarn loop slides. This also applies when the distance between the slide and the needle is short in the closed position. Also in this case, the maximum circumference of the entire body of the needle and the slide is no larger than the circumference of the corresponding needle shaft. If it is possible to prevent the yarn loop from widening during the movement of the needle together with the slide in the closed position, the yarn tension at the entrance can be increased within certain limits, which in turn results in better knitted product quality.

Preferably, the circumference of the needle bar at the end of the sliding area is exactly as large as the overall maximum circumference of the needle and the slide in the closed position. Therefore, when the needle moves through the loop with the slide in the closed position, the loop does not widen nor shrink.

Preferably, the needle shaft has a greater thickness than the needle head at the end of the sliding area. The thickness in this case is the direction along which the individual slip needles are arranged adjacent to each other in the corresponding needle bar. By increasing the thickness, the circumferential length can be correspondingly increased in a simple manner.

Preferably, the entire circumference of the sliding needle and the sliding piece in the closed position has a maximum change of 15% from the needle to the end of the sliding area. When the sliding needle and the sliding plate move together through the yarn loop, the circumferential length of the sliding needle and sliding plate combination has almost no change. Therefore, the yarn loops also maintain their original shape without significant increase or decrease.

Preferably, the needle bar is assembled into a cylindrical shape at least at the end of the sliding area. A transition is obtained between the needle and the end of the sliding area. The cylindrical arrangement of the needle bars produces an approximately circular linear loop of yarn that can then be easily unlooped.

Preferably, the sliding needle assembly has a fineness of E32 to E44. In other words, 32 to 44 slide pin assemblies are provided in a width of 1 inch (25.4 mm). Thus, very fine knitwear can be produced, which is particularly advantageous such as for elastic articles such as swimwear or the like.

This object is achieved by a sliding needle assembly of the initially mentioned type, whereby the needle bar has at least at the end of the sliding area a circumference that is at least integral with the needle and the slide parallel to the needle in the closed position. The largest circumference is the same size.

As explained above in connection with the warp knitting machine, the necessity of widening the yarn loops as the needle moves together with the slide through the yarn loops is thus avoided. Accordingly, good knitwear quality can be achieved and still high working speeds can be achieved. The avoidance of yarn loop widening is mainly advantageous when there is little time available for widening due to the short slip needle stroke.

Preferably, the circumference of the needle bar at the end of the sliding area is exactly as large as the overall maximum circumference of the needle and the slide in the closed position. When the yarn loop is unlooped, that is, when the slip needle and the slider move together through the yarn loop, the obtained circumferential length does not change, and the size of the yarn loop does not increase or decrease.

Preferably, the needle shaft has a greater thickness than the needle head at the end of the sliding area. This is a simple possibility to increase the circumferential length of the needle bar.

Preferably, the entire circumference of the sliding needle and the sliding piece in the closed position has a maximum change of 15% from the needle to the end of the sliding area. When the loop of yarn is unhooked, ie when the slip needle moves together with the slide through the loop of yarn, the circumferential length obtained is almost unchanged.

This object is achieved in a method of the initially mentioned type, whereby when the yarn loop is unhooked, the widening of the yarn loop is prevented by positioning the needle bar at the position of the yarn loop at the end of the needle stroke. The circumference in the sliding area is chosen to be at least as large as the maximum circumference of the entire body of the needle and the sliding needle parallel to the needle in the closed position.

Good knitwear quality is obtained when widening of yarn loops is prevented. At the same time, however, relatively short slip needle strokes can be used, which has a positive influence on the possible operating speeds of the warp knitting machine.

Preferably, the circumference of the needle bar at the end of the sliding area is exactly as large as the overall maximum circumference of the needle and the slide in the closed position. Therefore, the yarn loops do not need to be changed during de-looping. Therefore, the size of the yarn loops does not need to be increased or decreased.

Preferably, the needle shaft has a greater thickness than the needle head at the end of the sliding area. This is a simple possibility of equipping the needle with a correspondingly large circumference at the end of the sliding area.

Preferably, the entire circumference of the sliding needle and the sliding piece in the closed position has a maximum change of 15% from the needle to the end of the sliding area. The size of the yarn loop can then remain unchanged during unlooping (i.e. when the slip needle moves with the slide through the yarn loop).

Preferably, the thickness of the slip needle assembly in the E32 to E44 region is used. Therefore, 32 to 44 slip pins are used in a length of 25.4 mm (= 1 inch).

The warp knitting machine 1 shown only schematically in Figure 1 contains a knitting needle bar 2 to which a plurality of slip needles 3 are fastened. The slip needle 3 forms the knitting needle described in detail in conjunction with Figures 2 to 4 . Furthermore, the warp knitting machine 1 has a plurality of yarn guide bars 4 to which the yarn guide 5 is fastened. As shown in Figures 2 and 3, the yarn guide 5 can be assembled into guide needles 6, 7 or yarn guide needles.

In the case of the present invention, the warp knitting machine 1 can have, for example, two yarn guide bars 4 .

The slip needle 3 has a needle 8 which surrounds the pleat space 9 . In the position shown in Figure 2, this pleat space 9 is open so that the slip needle 3 can catch one or more of the yarns guided by the yarn guide needles 6,7. The needle 8 is arranged at the end of the needle bar 10 .

When the slip needle 3 is moved further to reach the position shown in Figure 3, the needle can move through the yarn loops that have been formed on the needle bar 10 but are not shown. In order to prevent the needle or the opening of the pleat space 9 from hooking with the yarn loop, a slide 11 is provided, and the slide 11 is arranged on the slide bar 12 . The slide 11 closes the pleat space 9 . The slide 11 is arranged on a slide bar (not shown in detail).

The warp knitting machine 1 further has a sinker bar 13 and a plurality of sinkers 14 . On the one hand, the sinker 14 delimits a sliding area in which the yarn loop can slide on the slip needle 3 . On the other hand, when the sliding needle 3 moves from the position shown in FIG. 2 to the position shown in FIG. 3 , the sinker 14 helps to peel off the yarn loop from the sliding needle 3 .

FIG. 4 shows one of the slide pins 3 with a schematically depicted slide 11 . One end 15 of the sliding area is further indicated. In this position, the loop of yarn as mentioned above can slide on the needle bar 10 when the sliding needle 3 is raised.

The warp knitting machine 1 has a relatively small stroke of the slip needle 3 . This stroke is maximum 10 mm. The length of the sliding area between the needle 8 and the end 15 of the sliding area is therefore of a similar order of magnitude.

When the slider 11 is in the closed position and the pleat space 9 is closed, the needle 8 and the slider 11 have a certain circumference as a whole. The sliding pin 3 is now dimensioned such that it has a correspondingly large circumference at the end 15 of the sliding area.

Therefore, the yarn loop cannot be smaller than the circumference corresponding to the slip needle 3 at the end 15 of the sliding area. This in turn results in the fact that the yarn loop does not need to be widened when the slip needle 3 moves through the yarn loop together with the slide 11 in the closed position. Correspondingly, high working speeds can also be achieved with short strokes of the slip needle of up to 10 mm, since no time is required to widen the yarn loop. In addition, not widening the yarn loops has a positive impact on the quality of knitted products.

For example, a correspondingly large circumference can be achieved at the end 15 of the sliding area of the sliding pin 3, whereby the sliding pin 3 has a greater thickness at the end 15 of the sliding area. This thickness is the extension of the sliding needles 3 in the direction in which the sliding needles 3 are arranged adjacent to each other on the knitting needle bar 2 .

It can also be provided that when the yarn loop is unhooked (that is, when the slip needle 3 moves through the yarn loop), the periphery of the slip needle 3 has almost no change. In other words, the entire circumference of the sliding needle 3 and the sliding piece 11 in the closed position has a maximum change of 15% from the far end of the needle 8 to the end 15 of the sliding area.

It is also advantageous in any case if the sliding pin 3 has a cylindrical shape at the end 15 of the sliding area.

This warp knitting machine can produce very fine knitted fabrics. The thickness of the slip pin assembly can be used in the E32 to E44 area, i.e., 32 to 44 slip pins 3 can be configured on a length of 25.4 mm or 1 inch.

Due to the cylindrical arrangement of the needle bar 10, the yarn loop can slide to unloop the needle 8 and the slide 11 in the closed position without widening. Due to this geometry of the rod, a tension ratio is preferably achieved during loop formation that contributes to improving the quality of the knitted product.

1: Warp knitting machine 2: Knitting needle stick 3: Sliding needle 4: Yarn guide rod 5: Yarn guide 6,7: Guide needle/yarn guide needle 8: needle 9: Pleats space 10: Needle bar 11: Slider 12: Slide rod 13: Sinker rod 14: Sinker 15: One end of the sliding area

The present invention is described below with reference to preferred exemplary embodiments in conjunction with the drawings. In the attached picture: Figure 1 shows the height diagram of a warp knitting machine. Figure 2 shows the knitting tool of the warp knitting machine in the first working position. Figure 3 shows the knitting tool of the warp knitting machine in the second working position, and Figure 4 shows a schematic diagram of a sliding needle with a sliding plate.

3: Sliding needle

4: Yarn guide rod

6,7: Guide needle/yarn guide needle

8: needle

9: Pleats space

10: Needle bar

11: Slider

12: Slide rod

14: Sinker

15: One end of the sliding area

Claims (11)

A sliding needle assembly of a warp knitting machine. The warp knitting machine has a maximum sliding needle stroke of 10 mm. The sliding needle assembly has a sliding needle and a sliding piece. The sliding needle has a needle head and a needle bar. The slide cooperates with the slide needle, wherein the needle bar has a circumference at at least one end of a sliding area, the circumference is at least parallel to a maximum circumference of the entire body of the needle and the slide in the closed position. The needle bar is cylindrical at least at the end of the sliding area. The sliding needle assembly of claim 1, wherein the circumference of the needle bar at the end of the sliding area is just as large as the maximum circumference of the entire body of the needle and the slide in the closed position. The sliding needle assembly of claim 1 or 2, wherein the needle bar has a thickness greater than the needle head at the end of the sliding area. The sliding needle assembly of claim 1 or 2, wherein the entire circumference of the sliding needle and the sliding piece in the closed position has a maximum change of 15% from the needle to the end of the sliding area. Such as the sliding needle assembly of claim 1 or 2, wherein the sliding needle assembly has a thickness of 32 to 44 sliding needles on 25.4mm (E32 to E44). A warp knitting machine, which has a plurality of sliding needle assemblies according to any one of claims 1 to 5. A method for producing an elastic knitted product. In the method, several slip needle assemblies are used to form several yarn loops of the knitted product. Each of the slip needle assemblies includes a sliding piece and a slip needle, The slip needle has a needle head and a needle bar, wherein the slip needle has a maximum stroke of 10mm, wherein when the yarn loops are unhooked, the widening of the yarn loops is prevented by the following method: The circumference of the needle bar at the end of a sliding area where the yarn loop at the end of a slip needle stroke is located is selected to be at least as large as the maximum circumference of the entire body of the needle parallel to it and the slip needle in the closed position. , characterized in that the needle bar is cylindrical at least at the end of the sliding area. The method of claim 7, wherein the circumference of the needle bar at the end of the sliding area is just as large as the maximum circumference of the entire body of the needle and the slide in the closed position. The method of claim 7 or 8, wherein the needle bar has a thickness greater than the needle head at the end of the sliding area. The method of claim 7 or 8, wherein the entire circumference of the sliding needle and the sliding piece in the closed position has a maximum change of 15% from the needle to the end of the sliding area. The method of claim 7 or 8, wherein the sliding needle assembly is used to have a thickness of between 32 sliding needles and 44 sliding needles on 25.4mm (E32 to E44).