阅读说明：本技术 成圈工具和用于制造成圈工具的方法 (Knitting tool and method for producing a knitting tool ) 是由 S.考夫霍尔德 G.舒勒 于 2018-12-20 设计创作，主要内容包括：本发明涉及成圈工具和用于制造成圈工具的方法,具体而言说明了一种用于经编机的成圈工具(1),带有柄部(2),该柄部具有固定区域(5),成圈工具(1)利用该固定区域可插入到经编机梳栉(7)的容纳凹槽(6)中。固定区域(5)具有前侧(8)、背侧(9)和两个侧壁(10,11)。为了使成圈工具(1)在容纳凹槽(6)中的精准的插入和取向变得简单,所述侧壁(10,11)彼此平行地取向,其中所述侧壁(10,11)彼此的间距在固定区域(5)中变化了最大5μm。另外,说明了一种用于从成圈工具半成品中制造用于经编机的成圈工具(1)的方法。(The invention relates to a knitting tool and a method for producing a knitting tool, in particular to a knitting tool (1) for a warp knitting machine, comprising a shank (2) having a fastening region (5) with which the knitting tool (1) can be inserted into a receiving groove (6) of a warp knitting machine guide bar (7). The fastening region (5) has a front side (8), a rear side (9) and two side walls (10, 11). In order to simplify the precise insertion and alignment of the knitting tool (1) in the receiving recess (6), the side walls (10,11) are aligned parallel to one another, wherein the distance between the side walls (10,11) varies by a maximum of 5 [ mu ] m in the fastening region (5). Furthermore, a method for producing a knitting tool (1) for a warp knitting machine from a knitting tool blank is specified.)

1. A knitting tool (1) for a warp knitting machine, having a shank (2), which shank (2) has a fastening region (5), with which fastening region (5) the knitting tool (1) can be inserted into a receiving groove (6) of a guide bar (7), wherein the fastening region (5) has a front side (8), a rear side (9) and two side walls (10,11) between the front side (8) and the rear side (9), characterized in that the side walls (10,11) are parallel to one another, wherein the distance of the side walls (10,11) from one another varies by a maximum of 5 μm in the fastening region (5).

2. Knitting tool according to claim 1, characterized in that the distance of the side walls (10,11) from one another varies by a maximum of 1 μm in the fixing region (5).

3. Knitting tool according to claim 1 or 2, characterized in that a hook region (3) is provided on one side of the fastening region (5) and a foot (4) is provided on the opposite side of the fastening region (5).

4. The looping tool according to any of claims 1 to 3, characterized by a guide area for a stylet.

5. The looping tool according to any of claims 1 to 4, characterized in that the cross section of the shank (2) in the fixing region (5) is smaller than in the remaining region of the shank (2).

6. The looping tool according to one of claims 1 to 5, characterized in that the distance of the side walls (10,11) from one another is adjusted by means of a laser removal method in such a way that the distance of the side walls (10,11) from one another varies by a maximum of 5 μm, in particular a maximum of 1 μm, in the fixing region (5).

7. A method for producing a knitting tool (1) for a warp knitting machine from a knitting tool blank, the looping tool has a shank (2) with a fastening region (5) for insertion into a receiving groove (6) of a guide bar (7), wherein the shank (2) has a first surface section (10) and a second surface section (11) opposite the first surface section (10), wherein the semi-finished knitting tool is subjected to a machining step in which material is removed from the first surface section (10) and/or the second surface section (11), and wherein the machining step is carried out in such a way, i.e. such that the first surface section (10) and the second surface section (11) form two planes parallel to each other after the machining step, which planes are spaced apart from each other by a predefined shank thickness.

8. Method according to claim 7, characterized in that the deviation of the shank thickness between the first surface section (10) and the second surface section (11) after the machining step is at most 5 μm, in particular at most 1 μm.

9. Method according to any one of claims 7 or 8, characterized in that the first surface section (10) and the second surface section (11) form side walls (10,11) of a fixing region (5) of the knitting tool (1) lying opposite one another.

10. Method according to any one of claims 7 to 9, characterized in that, prior to the step of processing the knitting tool semi-finished product, a receiving groove (6) of a guide bar (7) is measured at least with respect to the width of the receiving groove (6), into which receiving groove the knitting tool (1) is insertable, wherein the predefined shank thickness is selected to be less than or maximally equal to the measured width of the receiving groove (6).

11. Method according to any one of claims 7 to 10, characterized in that the step of machining of the knitting tool is realized by means of a laser removal method.

12. Method according to any one of claims 7 to 10, characterized in that the step of machining of the looping tool is realized by means of a grinding or etching method.

13. Method according to one of claims 7 to 12, characterized in that the knitting tool semifinished product is configured as a needle with a needle head, in particular as a compound needle.

14. Method for producing an overall system of a guide bar (7) of a warp knitting machine for receiving at least one knitting tool (1) and at least one knitting tool (1) which can be inserted into a receiving groove (6) of the guide bar (7), with the following steps:

-providing a guide bar (7) with at least one receiving groove (6),

-measuring at least the width of the at least one accommodation groove (6),

-providing a semifinished loop-forming tool with a fastening region (5) having two side walls (10,11) lying opposite one another, and

-machining the semi-finished knitting tool by removing material on at least one of the side walls (10,11) of the fastening region (5) until the side walls (10,11) form two planes parallel to each other, which are spaced apart from each other by the value of the measured width of the receiving recess (6) at the maximum.

Technical Field

The invention relates to a looping tool (Wirkwerkzeug) for a warp knitting machine, comprising a shank having a fastening region with which the looping tool can be inserted into a receiving groove of a guide bar (Barre), wherein the fastening region has a front side, a rear side and two side walls between the front side and the rear side.

The invention also relates to a method for producing such a knitting tool from a semifinished product, and to a method for producing an overall system consisting of a guide bar and a knitting tool of a warp knitting machine.

Background

The knitting tools used in warp knitting machines are, for example, needles, in particular working or knitting needles, such as compound needles (Schiebernadel) and crochet needles, thread guides (Legenadel) or eye needles (Lochnadel), and loop sinkers (polplatines), knock-over sinkers (abschlagplatines), raschel sinkers (stechkammplatines, sometimes referred to as grip sinkers) or the like.

Such a knitting tool is known from warp knitting machines. Document DE 1020132015708B 4 discloses a needle with a thick head with a hook and a tongue (vollkkopf-Wirknadel). In warp knitting machines, a large number of knitting tools are usually inserted side by side into receptacles in the guide bar. In this case, it is particularly important for the quality of the knitted fabric produced that the knitting tool be positioned as precisely as possible in the receptacle, since defects can occur in the knitted fabric due to the incorrect position of the knitting tool.

For better centering of the needle in a corresponding matching groove of the needle holder, a needle for a warp knitting machine is known from DE 102006004099B 3, in which the fastening section of the shank has a greater width in the region of the front or rear side than in the region of its opposite side.

In warp knitting machines, the knitting tools are wear parts which have to be replaced at certain time intervals. The effort for replacing hundreds of knitting tools in warp knitting machines is also significant, since the knitting tools can only be produced with correspondingly large manufacturing tolerances in high-volume production, which sometimes requires manual measuring and sorting of the knitting tools before they can be installed. Nevertheless, the knitting tools can be inserted into the warp knitting machine insufficiently precisely and unrepeatably due to manufacturing tolerances.

Disclosure of Invention

The object of the invention is therefore to specify an improved warp knitting tool and a production method therefor.

This object is achieved according to the invention by means of a knitting tool of the type mentioned at the outset in that the side walls are parallel to one another, wherein the distance between the side walls varies by a maximum of 5 μm, in particular a maximum of 1 μm, in the fastening region.

The idea of the invention is therefore that the knitting tool can be inserted into the warp knitting machine with particular precision and with little effort when the side walls of the fastening region are as perfectly plane-parallel to one another (plancarallel) and as perfectly coordinated with the slot width of the receptacle with respect to the thickness. Such high precision has hitherto not been possible in the case of mass production of knitting tools, which is required for cost reasons. The invention therefore proposes that the fastening region necessary for the orientation of the knitting tool in the warp knitting machine be finished in such a way that a sufficiently precise orientation of the knitting tool can be achieved at minimal cost.

The inventive idea can in principle be applied to different types of knitting tools. The knitting tool can thus be an eyelet needle through which the thread is guided. The knitting tool can also be a knitting needle or a working needle, in which a hook region is provided on one side of the fastening region, wherein a foot is provided on the opposite side of the fastening region.

According to one embodiment of the invention, the shank of the looping tool has a smaller cross section in the fastening region than in the remaining region of the shank. The reduced cross-section may be the result of a finishing of the fixing area.

The distance of the side walls from one another is advantageously set by means of a Laser-ablation method (Laser-ablation method) in such a way that the distance of the side walls from one another varies by a maximum of 5 μm, in particular a maximum of 1 μm, in the fastening region. The laser removal method, in addition to the desired dimensional accuracy of the fastening region, also creates a surface structure in the fastening region that is particularly suitable for precise insertion of the knitting tool, without the need for additional surface machining steps. Alternatively or additionally, the side walls can also be machined by means of an etching method and/or by means of a grinding method.

The above-mentioned object is further achieved by a method for producing a knitting tool for a warp knitting machine from a semifinished knitting tool, wherein the semifinished product has a shank with a fastening region for insertion into a receiving groove of a warp knitting machine guide bar, and the shank has a first surface section (for example, one side wall of the fastening region of the knitting tool) and a second surface section (for example, one side wall of the fastening region of the knitting tool) lying opposite the first surface section. The semifinished loop tool is in particular a loop tool which has not yet been finished to final dimensions at least in the fastening region and which can already have all the other necessary features, for example hooks, tongues and/or core grooves (Schiebernut). The semifinished product is, for example, a conventional needle or the like for warp knitting machines, which is produced in mass production. According to the method according to the invention, the semifinished product is subjected to a machining step in which material is removed from the first surface section and/or the second surface section, wherein the machining step is carried out in such a way that the first surface section and the second surface section form two planes parallel to one another after the machining step, which are spaced apart from one another by a predefined shank thickness. Preferably, the deviation in the shank thickness after the machining step between the first surface section and the second surface section is at most 5 μm, in particular at most 1 μm.

In order to achieve a particularly precise orientation of the knitting tool in the warp knitting machine, according to a particularly preferred embodiment of the method according to the invention, it is provided, before the step of processing the semifinished product, that the receiving groove of the textile machine bar, into which the knitting tool can be inserted, is measured at least with respect to its width, wherein the predefined shank thickness is selected to be substantially equal to the measured width of the receiving groove in order to produce the press fit. It is thereby possible to adapt the knitting tools individually to the warp knitting machine.

The machining of the semifinished product with the precision required according to the invention can be effected, for example, by means of a laser removal method. Alternatively or additionally, it is also possible for the step of processing the semifinished product to be carried out by means of a grinding or etching method.

In a further development of the inventive concept, a method for producing an overall system of a guide bar of a warp knitting machine for receiving at least one knitting tool and at least one knitting tool which can be inserted into a receiving groove of the guide bar is proposed. The method according to the invention has in particular the following steps: the method comprises the steps of producing or providing a guide bar with at least one receiving groove, measuring at least the width of the receiving groove, producing or providing a semifinished product of the knitting tool with a fastening region having two side walls lying opposite one another, and machining the semifinished product by removing material from at least one side wall of the fastening region until the side walls form two planes parallel to one another, which are spaced apart from one another by the maximum of the measured width of the receiving groove.

Drawings

The invention is described below with reference to the drawings according to a preferred embodiment. Wherein:

FIG. 1 shows a first embodiment of a looping tool in a perspective view, which is designed as a latch needle, and

fig. 2 shows the knitting tool according to fig. 1 in a sectional view in the inserted state in the receptacle.

In all the figures, identical and mutually corresponding elements are provided with the same reference signs.

Detailed Description

The looping tool 1 shown in the figures is configured in the embodiment presented as a crochet hook. The looping tool 1 has a shank 2 with a longitudinal direction. Furthermore, the looping tool 1 has a hooked region 3 at the upper end in fig. 1. In order to be able to pull the hook through the previously formed loop during the looping process, a needle core (Schieber) is usually applied, which is guided in a guide region not represented in the figures. Also, the core is not presented here for the sake of overview. On the side opposite the hook region 3 (downward in fig. 1), the knitting tool 1 is provided with a foot 4.

Between the hook region 3 and the foot 4, a fastening region 5 is formed, which can be inserted into a receiving groove 6 of a guide bar 7, as shown in fig. 2. In the warp knitting machine, the side walls of the receiving pocket 6, that is to say the left and right inner walls of the pocket in fig. 2, are as ideally plane-parallel to one another as possible depending on the production.

The fastening region 5 of the knitting tool 1 has a front side 8, which is upper in fig. 2, a rear side 9, which is lower in fig. 2, and two side walls 10,11, which lie opposite one another and extend between the front side 8 and the rear side 9.

In order to achieve a precise positioning of the knitting tool 1 with its fastening region 5 in the receiving recess 6, in particular the side walls 10,11 of the fastening region 5 are machined with high precision. In the embodiment presented, the receiving recess 6 is rectangular in cross section as shown in fig. 2. Thus, the side walls 10,11 are likewise arranged as ideally as plane-parallel to one another as possible. This is achieved in that at least the fastening region 5 is subjected to a special machining, in particular a laser removal method.

When the width of the receiving groove is not known, first the receiving groove 6 is measured at least with respect to its width. Subsequently, the semifinished loop tool, for example the needle shown in fig. 1, is worked by removal at least in the fastening region 5 before the final working, until the side walls 10,11 are as parallel as possible to one another and the distance of the side walls 10,11 from one another corresponds as precisely as possible to the width of the acquired receiving recess 6.

By means of the laser removal method, the side walls 10,11 can be machined with such precision that their distance from one another in the fastening region 5 varies by no more than 5 μm, in particular by a maximum of 1 μm. Furthermore, it is possible with the laser ablation method to adjust the distance of the side walls 10,11 from one another to a maximum of 5 μm, in particular to a maximum of 1 μm, precisely to the measured width of the receiving recess 6.

The use of a laser removal method for machining the fastening region 5 of the knitting tool 1 furthermore has the advantage that a further surface treatment of the fastening region 5 is not required in most cases. Furthermore, the laser removal method can be automated as far as possible and used with short processing times for individually adapting the side wall spacing for each looping tool 1.

Alternatively to machining only the fastening region 5 of the looping tool 1, the entire shank 2 can also be machined. For reasons of efficiency, however, it is preferred to machine only the fastening region 5. This can result in the fastening region 5 having a smaller thickness than the remaining shank 2. The shoulder between the fastening region 5 and the remaining shank 2, which shoulder may be present here, can additionally be used for orienting and fastening the knitting tool 1 in a guide bar 7 or a similar holder.

Overall, the inventive processing of the fastening region 5 of the knitting tool 1 promotes a significantly more precise orientation of the knitting tool in the guide bar 7, thereby further improving the quality of the knitted fabric produced with the warp knitting machine. Furthermore, the effort is significantly reduced when the knitting tool is exchanged due to the higher precision of the adaptation in comparison to conventional knitting tools, since the effort for the orientation can be kept small. Furthermore, it is also possible that the precision with respect to the design of the fastening region 5 during the production of the ring tool semifinished product reduces the processing effort, since according to the invention a finishing of the fastening region 5 always takes place. This can reduce the manufacturing cost.

The machining of the fastening region 5 is preferably carried out here in such a way that the knitting tool 1 is minimally smaller than the receiving groove 6 in the fastening region 5, in order to be able to insert the knitting tool 1 into the guide bar 7 with a press fit.