DE2330474A1 - NEEDLE FOR KNITTING MACHINES - Google Patents

Description

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HELMUT SCHROETER KLAUS LEHMANN

BIPL.-PHY8. D1PL.-ING. OQOO / 7 / β MÖNCHEN 25 · U POWSKYSTR. 10 ·

The Torringt on Company IjJ. June 1973

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Needle for knitting or knitting machines

The invention relates to needles for knitting machines. In particular, the invention relates to a needle made from a combination of flat material and wire material is made.

The demand for textile materials made by knitting machines is constantly increasing. Around To meet increasing demand, the manufacturers of these textile products insist that the needle manufacturers knit or Make knitting machine needles available that the constantly increasing needle speeds in the knitting or Knitting machines have grown.

It has been found that under certain conditions, when the root portion of the needle is made of flat material, the Needle can be manufactured more consistently, more precisely and stronger and more freedom for the formation of very complex foot designs that are necessary to meet the requirements of the model controls of the machines. Even such foot sections made of flat material can do better than others because of their rigid rectangular cross-section Needles work when they go back and forth in the slots of knitting or knitting machine cylinders or heads. It was but also found that it is desirable to manufacture the hook and shaft portion of the needles from wire material. The wire material forms a better hook than the flat material. If flat material is used for the hook and shaft section

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the hook would often break off much more quickly than if wire material were used.

For many years, manufacturers of needles for knitting machines have endeavored to connect the foot section to create from flat material with the hook and shaft portion made of wire material, which the needle a sufficient strength so that they have the longest possible service life under the working conditions of knitting machines. Until now however, these efforts were unsuccessful.

The invention is therefore based on the object of creating a needle for knitting machines that consist of a combination consists of sheet material and wire material and which under the working conditions of modern knitting or knitting machines for works successfully for a long time.

is
The needle according to the invention / characterized in claim 1.

The foot section made of flat material and the hook and shaft section made of wire material are thus connected or fused together along parts of both sections, which are in Extend the longitudinal direction of the needle and overlap each other.

Preferred embodiments of the needle according to the invention are characterized in the subclaims, in particular in claim 3.

An embodiment of the invention is described below with reference to the drawing.

Figure 1 is a side view of the needle of the invention.

FIG. 2 is an enlarged partial view of the needle of FIG. 1.

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Figure J5 is a sectional view taken along line 3-3 in Figure

According to FIG. 1, the needle has a foot section 10 made of flat material on. This is made by welding or other fusion processes with a hook and shaft section 12 Wire material connected. The hook and shaft portion 12 has a shaft 14 and a hook 16 at one end of the shaft 14 is arranged. A tongue 18 is on one Mounted joint 20 and can pivot about this joint when the needle moves back and forth in the machine.

Figure 2 shows how the shaft 14 made of wire material with a Part 22 of reduced height of the foot section 10 made of flat material is connected. is, for example, by a Weld 24. The thickness of the weld is exaggerated for clarity of illustration in FIG.

The part 22 with reduced height goes into the remaining part of the Foot section 10 made of flat material over a curve 26 over. The length of the connection point 24 of the shaft section 12 is essentially equal to the length of the part 22 with reduced Height of the foot section 10 made of flat material. Preferably, the length of the junction 24 is at least 15 times as great the thickness 20 (Figure 3) of the section 10 made of flat material.

In operation, the needle reciprocates in the direction of its longitudinal axis. When going back and forth she gets great tensile and compressive forces subjected in the direction of the reciprocating motion .

Modern needles are often no more than 0.28 mm (0.011 ") thick.

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When in such needles the / end of the hook and shaft section

forehead
12 were to be connected or fused to the / end of the foot section 10 made of flat material, the needle would fail very quickly because of such fused connections or welds

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are very weak under stress. However, if a long lap joint 24 is provided, the joint is made or merging in a direction parallel to the needle axis and thus parallel to the reciprocating motion the needle. This results in a much larger connection area and thus greater resistance against bending, tensile and compressive loads in the needle.

The curved section 26 in the foot section 10 from Flat material eliminates any sharp corner at the transition between the wire material shaft 14 and the foot portion 10 Flat material. It has been found that under certain circumstances the presence of sharp corners will cause an earlier needle failure which can be avoided if the provision of the curve 26 eliminates sharp corners.

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Claims (2)

ir-gate-20 Claims Iy needle for knitting machines with a foot section made of flat material and a shaft section made of wire material «characterized in that the shaft section (12) with the foot section (10) longitudinally longitudinally extending parts of both sections connected (merged) is. 2. Needle according to claim 1, characterized in that that the foot portion (10) has a longitudinally extending portion (22) of reduced height, which over a distance on the foot portion formed curve (26) merges into the remaining part of the foot section «that the longitudinally extending part of the shaft section (12) is connected (fused) to the part (22) of reduced height of the foot section (10) and that the lengths of the longitudinally extending parts of the shaft portion (12) and of the part with reduced height of the foot portion (10) are roughly the same. J5. Needle according to Claim 1 or 2, characterized in that it is that. the length of the connection point (fusion point 24) between the two needle sections (10, 12) is at least fifteen times the thickness (20) of the foot section (10) " 309883/0997, • t Blank page