阅读说明：本技术 经编机、复合针组件和用于制造弹性编织物的方法 (Warp knitting machine, composite needle assembly and method for producing an elastic knit ) 是由 K·布兰德尔 于 2021-01-26 设计创作，主要内容包括：本发明涉及一种经编机,其带有大量复合针组件,其中的每个复合针组件具有针芯(11)以及带有针头(8)和针杆(10)的复合针(3),其中该经编机具有最大10mm的复合针升程。想要在编织物的高质量的情况下实现经编机的高生产率。为此设置成,针杆(10)至少在线圈位于复合针升程运动结束时的所在的滑动区域的末端(15)处具有如下的周长,其至少与平行于其的针头(8)和在关闭位置中的针芯(11)的整体的最大周长一样大。(The invention relates to a warp knitting machine having a plurality of compound needle assemblies, wherein each compound needle assembly has a core (11) and a compound needle (3) having a needle head (8) and a needle bar (10), wherein the warp knitting machine has a compound needle lift of at most 10 mm. It is desirable to achieve high productivity of warp knitting machines with high quality of the knitted fabric. For this purpose, the needle bar (10) has a circumference at least at the end (15) of the sliding region, at which the coil is located at the end of the combined needle lifting movement, which is at least as large as the maximum circumference of the needle head (8) parallel thereto and of the needle core (11) in the closed position.)

1. Warp knitting machine (1) with a multitude of composite needle assemblies, each of which has a core (11) and a composite needle (3) with a needle head (8) and a needle bar (10), wherein the warp knitting machine (1) has a composite needle lift of maximum 10mm, characterized in that the needle bar (10) has a circumference at least at the end (15) of the sliding region where the stitch is located at the end of the composite needle lift movement, which is at least as large as the maximum circumference of the needle head (8) parallel thereto and of the core (11) as a whole in the closed position.

2. Warp knitting machine according to claim 1, characterized in that the circumference of the shank (10) at the end (15) of the sliding area is just as large as the maximum circumference of the needle head (8) and the core (11) as a whole in the closed position.

3. Warp knitting machine according to claim 1 or 2, characterized in that at the end (15) of the sliding area the shank (10) has a greater thickness than the needle (8).

4. Warp knitting machine according to one of claims 1 to 3, characterized in that the circumference of the whole consisting of the compound needle (3) and the core (11) in the closed position varies by a maximum of 15% from the needle head (8) to the end (15) of the sliding area.

5. Warp knitting machine according to one of claims 1 to 4, characterized in that the needle bar (10) is cylindrically configured at least at the end (15) of the sliding region.

6. Warp knitting machine according to any one of claims 1 to 5, characterized in that the compound needle assembly has a fineness from E32 to E44.

7. Composite needle assembly for a warp knitting machine (1) with a composite needle lift of maximum 10mm, wherein the composite needle assembly has a composite needle (3) with a needle head (8) and a needle shaft (10) and a core (11) co-acting with the composite needle (3), characterized in that the needle shaft (10) has a circumference at least at the end (15) of the sliding region which is at least as large as the maximum circumference of the needle head (8) parallel thereto and of the core (11) in the closed position.

8. Composite needle assembly according to claim 7, characterized in that the circumference of the needle shaft (10) at the extremity (15) of the sliding region is just as large as the maximum circumference of the needle (8) and of the hub (11) in the closed position as a whole.

9. Composite needle assembly according to claim 7 or 8, characterized in that the needle shaft (10) has a greater thickness than the needle (8) at the extremity (15) of the sliding region.

10. A composite needle assembly according to any one of claims 7 to 9, characterized in that the circumference of the whole consisting of the composite needle (3) and the hub (11) in the closed position varies by a maximum of 15% from the needle tip (8) to the tip (15) of the sliding region.

11. A method of manufacturing an elastic knitted fabric, in which a stitch of the knitted fabric is formed using a composite needle assembly, which in each case has a core (11) and a composite needle (3) with a needle head (8) and a shank (10), wherein the composite needle (3) has a lift of maximum 10mm, characterized in that widening of the stitch is prevented when the stitch is de-looped, in that at the end (15) of the sliding region where the stitch is at the end of the composite needle lift, the circumference of the shank (10) is selected to be at least as large as the maximum circumference of the whole parallel thereto, consisting of the needle head (8) and the core (11) in the closed position.

12. Method according to claim 11, characterized in that the circumference of the shank (10) at the end (15) of the sliding region is just as large as the maximum circumference of the needle (8) and the core (11) as a whole in the closed position.

13. Method according to claim 11 or 12, characterized in that at the end (15) of the sliding region the shank (10) has a greater thickness than the needle (8).

14. Method according to any of claims 11 to 13, characterized in that the circumference of the whole consisting of the compound needle (3) and the core (11) in the closed position varies by a maximum of 15% from the needle head (8) to the tip (15) of the sliding area.

15. The method according to any one of claims 11 to 14, characterized in that the fineness in the region from E32 to E44 of the composite needle assembly is used.

Technical Field

The invention relates to a warp knitting machine having a plurality of composite needle assemblies, wherein each composite needle assembly has a needle core (Schieber) and a composite needle having a needle head and a needle bar, wherein the warp knitting machine has a composite needle lift of at most 10 mm.

The invention further relates to a compound needle assembly for a warp knitting machine with a compound needle lift of at most 10mm, wherein the compound needle assembly has a compound needle with a needle head and a needle bar and a core interacting with the compound needle.

Finally, the invention relates to a method for producing an elastic knitted fabric, in which a stitch of the knitted fabric is formed using a composite needle assembly, which in each case has a needle core and a composite needle with a needle head and a needle shaft, wherein the composite needle has a lift of at most 10 mm.

Background

Warp knitting machines with compound needle systems (i.e. with a large number of compound needle assemblies) are characterized by particularly high production efficiency. More than 4,000 rows of coils per minute can be produced. However, such high operating speeds lead to problems which are manifested in particular when the supplied warp threads are laid over (Aufschwingen). Which can result in a loss of quality of the braid. This is particularly true if one wants to make an elastic fabric in which the warp yarns supplied must have a certain elasticity.

By optimizing the motion of the braiding tool, a portion of the problem can be reduced. Generally, associated therewith is a reduction of the amount and time of movement of the knitting tools with respect to each other. However, this often results in a limitation in the range of feasible products of the produced knitted fabric.

Disclosure of Invention

The aim of the invention is to achieve a high productivity of a warp knitting machine with good quality of the knitted fabric.

This object is achieved in a warp knitting machine of the type mentioned at the beginning in that the needle bar has a circumference at least at the end of the sliding region in which the stitch is located at the end of the compound needle stroke movement, which is at least as large as the overall maximum circumference of the needle head parallel thereto and of the needle core in the closed position.

The composite needle forms a knitting needle or working needle. When the loop has been formed, it is located on the needle bar. The compound needle is then raised, whereby the catching space of the needle head can again grip the warp thread and can pull it through the formed loop. During this process, the core closes the catching space of the needle. By using a relatively "thick" needle shaft, it is now achieved that the stitch does not have to be widened when the needle is moved through the stitch together with the needle core which has closed the catching space. Thus, the "needle and core as a whole" has a circumference no greater than the shaft over which the loop slides. This also applies if the core has a smaller spacing to the needle in the closed position. In this case, the maximum circumference of the needle and the hub as a whole is not greater than the corresponding circumference of the shaft. If the stitch can be prevented from widening upon movement of the needle with the core in the closed position, the yarn tension at the feed (Einlauf) can be increased to some extent, which in turn leads to a better quality of the knit.

Preferably, at the end of the sliding region, the circumference of the shaft of the needle is just as large as the maximum circumference of the needle and of the needle core as a whole in the closed position. The loop is neither widened nor constricted when the needle is moved through the loop with the core in the closed position.

Preferably, at the end of the sliding region, the needle shaft has a greater thickness than the needle. The thickness is the direction in which the individual composite needles are arranged side by side in the respective needle bed (nadelberre). By increasing the thickness, the circumferential length can be correspondingly increased in a simple manner.

Preferably, the circumference of the whole consisting of the composite needle and the core in the closed position varies by a maximum of 15% from the tip of the needle to the end of the sliding region. The combined circumferential length of the composite needle and the core does not actually change as the composite needle and core move through the loop. Accordingly, the coil also retains its original dimensions and neither increases nor decreases significantly.

Preferably, the needle shaft is cylindrically configured at least at the end of the sliding region. A transition is made between the needle and the end of the sliding region. The cylindrical configuration of the needle shaft produces a loop that approximates a circumferential shape, which can then be easily unrolled.

Preferably, the composite needle assembly has a fineness from E32 to E44. In other words, 32 to 44 composite needle assemblies are provided over a 1 inch (25.4mm) width. A very thin braid can thus be produced, which is advantageous in particular in the case of elastic fabrics, as are used for example in swimwear or the like.

The invention is achieved by a composite needle assembly of the type mentioned at the outset in that the needle shaft has a circumference at least at the end of the sliding region which is at least as large as the maximum circumference of the needle parallel thereto and of the needle core as a whole in the closed position.

As explained above in connection with the warp knitting machine, it is thereby avoided that the stitch must be widened when the needle moves together with the core through the stitch. Accordingly, a good quality of the braid can be achieved, and still a high working speed. Avoiding widening of the coil is particularly advantageous if there is practically no time available for widening due to the short lift of the compound needle.

Preferably, the circumference of the shaft at the end of the sliding region is as large as the maximum circumference of the needle as a whole with the core in the closed position. In the case of a loop knockover, that is to say when the compound needle and the core are moved through the loop, no change in the length of the circumference takes place and the loop does not have to be enlarged nor reduced.

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

Preferably, the circumference of the whole consisting of the composite needle and the core in the closed position varies by a maximum of 15% from the tip of the needle to the end of the sliding region. In the case of a loop knockover, that is to say when the compound needle and the core are moved through the loop, practically no change in the length of the circumference takes place.

This object is achieved in a method of the type mentioned at the outset in that widening of the loop is prevented during the knocking over of the loop by the circumference of the needle shank being selected to be at least as large as the maximum circumference of the whole parallel thereto, formed by the needle head and the needle core in the closed position, in the sliding region in which the loop is located at the end of the combined needle stroke.

If widening of the coil is prevented, a good quality of the braid is obtained. At the same time, however, shorter lifts of the compound needles can be used, which positively influences the possible operating speed of the warp knitting machine.

Preferably, the circumference of the shaft at the end of the sliding region is as large as the maximum circumference of the needle as a whole with the core in the closed position. The coil does not have to be changed during the doffing. It does not have to be increased nor decreased.

Preferably, the needle shaft has a greater thickness than the needle at the end of the sliding region. This is a simple possibility to equip the needle with a correspondingly large circumference at the end of the sliding region.

Preferably, the circumference of the whole consisting of the composite needle and the core in the closed position varies by a maximum of 15% from the tip of the needle to the end of the sliding region. The size of the loop may then remain unchanged during knockover, i.e. when the compound needle moves together with the core through the loop.

Preferably, the fineness of the composite needle assembly in the region of E32 to E44 is used. Thus, 32 to 44 composite needles were used over a length of 25.4mm (=1 inch).

Drawings

The invention is described below with the aid of preferred embodiments in connection with the attached drawings. Wherein:

figure 1 shows a highly schematic representation of a warp knitting machine,

figure 2 shows the knitting tools of the warp knitting machine in a first working position,

FIG. 3 shows the knitting tools of the warp knitting machine in a second working position, and

fig. 4 shows a schematic representation of a composite needle with a core.

Detailed Description

A warp knitting machine 1, which is only schematically shown in fig. 1, has a knitting needle bed 2, at which a large number of compound needles 3 are fixed. The composite needle 3 forms a structuring needle which is described in more detail in connection with fig. 2 to 4. The warp knitting machine 1 furthermore has a plurality of guide bars (Legebarre)4, at which guide bars 4 thread guides 5 are fixed. As shown in these fig. 2 and 3, the thread guides 5 can be configured as guide bar needles (Legenadel)6, 7 or as piercing needles (Lochnadel).

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

The compound needle 3 has a needle head 8 surrounding a capture space 9. This catching space 9 is open in the position shown in fig. 2, whereby the compound needle 3 can grip one or more of the yarns guided by the yarn guides 6, 7. The head 8 is arranged at the end of the shank 10.

If the compound needle 3 is moved further in order to reach the position shown in fig. 3, the needle head must be moved through a not shown loop which has been formed on the needle shaft 10. In order to prevent the opening of the needle or the catching space 9 from hooking the loop, a needle core 11 is provided, which is arranged at a sliding bar (Schieberbarre) 12. The core 11 encloses the capture space 9. The needle core 11 is arranged at a slide bar, not shown in detail.

The warp knitting machine 1 furthermore has a sinker holder (or sinker bar, platinenbare) 13 with a large number of sinkers (or sliders, Platinen) 14. On the one hand, the sinkers 14 define a sliding area in which the stitches can slide on the compound needle 3. On the other hand, when the composite needle 3 goes from the position shown in fig. 2 into the position shown in fig. 3, then the sinker 14 helps to strip the loop from the composite needle 3.

Fig. 4 shows one of the composite needles 3 with a schematically shown core 11. The end 15 of the sliding area is also indicated. As mentioned above, when the compound needle 3 is raised, the loop can slide on the shank 10 up to this position.

The warp knitting machine 1 has a relatively small lift of the compound needle 3. The lift is maximum 10 mm. Correspondingly, the length of the sliding region between the needle 8 and the end 15 of the sliding region is also of a similar order of magnitude.

When the core 11 is in the closed position and encloses the capturing space 9, the needle 8 and the core 11 as a whole have a certain circumference. The composite needle 3 is now dimensioned such that it has a correspondingly large circumference at the end 15 of the sliding region.

Therefore, the loop cannot be smaller than its circumference corresponding to the tip 15 of the composite needle 3 at the sliding area. This in turn results in that it is not necessary to widen the stitch when the compound needle 3 and the needle core 11 in the closed position are moved through the stitch. Accordingly, even with a short lift of the compound needle of maximally 10mm, a higher operating speed can be achieved, since no time is required for widening the coil. In addition, the absence of widening loops positively affects the quality of the braid.

A correspondingly large circumference at the end 15 of the sliding region of the composite needle 3 can be achieved, for example, in that the composite needle 3 has a greater thickness at the end 15 of the sliding region. This thickness is the extension of the composite needles 3 in the direction in which the composite needles 3 are arranged side by side at the knitting needle bed 2.

It can also be provided that the circumference of the compound needle 3 is practically unchanged when the stitch is de-looped, i.e. when the compound needle 3 is moved through the stitch. In other words, the circumference of the whole constituted by the compound needle 3 and the core 11 in the closed position varies by a maximum of 15% from the tip 8 up to the end 15 of the sliding area.

It is also advantageous that the composite needle 3 has a cylindrical shape at least at the end 15 of the sliding region.

With this warp knitting machine, a very fine knitted fabric can be manufactured. That is, the fineness of the composite needle assembly in the region from E32 to E44 may be used, that is, 32 to 44 composite needles 3 may be arranged over a length of 25.4mm or one inch.

Due to the cylindrical configuration of the needle shaft 10, the slipping-off of the loop for the purpose of knocking-off is effected without widening via the needle 8 and the needle core 11 in the closed position. Due to this geometry of the rods, a tension ratio that contributes to the improved quality of the braid is preferably achieved during coil formation.