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US 6,973,807 B2Granted
Tip-headed needle
AssigneeGroz-Beckert KG
InventorsJohannes Bruske, Günther Büchle, Stephan Pfister
Life of this patent
Estimating the term…
Abstract
A stitch needle (10) is provided with a tip (29) which is shaped as a center punch and has no recognizable rounding at its terminus (31). The tip (29) is preferably arranged at mid height of the hook-shaped aperture (36) which is structured for capturing the yarn (13). The particular shape of the tip (29) and its positioning minimize the wear of the stitch needle (10) and also minimize damages to the yarn (13).
Claims18
A stitch needle for stitch-bonding technology, comprising
- an elongated needle body which has an aperture for receiving a yarn and which further has, at one end, a holding device and a pointed terminus at the opposite end and which also has two flat sides which converge at an acute angle toward the terminus;
- and the acute angle has, where it adjoins the terminus, a first magnitude which changes into a smaller, second magnitude at a transitional location which is remote from the terminus;
- and wherein the needle body has, between the terminus and the transitional location, a cross section formed of a polygon having rounded corners, with the cross section increasingly approaching a circular cross section toward the terminus.
A stitch needle comprising
- an elongated needle body that has an aperture for receiving a yarn and that further has a holding device at one end and a pointed terminus at the opposite end and that also has two flat sides that converge at an acute angle toward the terminus;
- and the acute angle has, where it adjoins the terminus, a first magnitude which changes into a smaller, second magnitude at a transitional location that is remote from the terminus;
- and wherein the needle body has a polygonal cross section between the terminus and the transitional location, and this polygonal cross section increasingly approaches a circular cross section toward the terminus.
A stitch needle for stitch-bonding technology, comprising
- an elongated needle body which has an aperture for receiving a yarn and which further has, at one end, a holding device and a pointed terminus at the opposite end and which also has two flat sides which converge at an acute angle toward the terminus;
- and the acute angle has, where it adjoins the terminus, a first magnitude which changes into a smaller, second magnitude at a transitional location which is remote from the terminus;
- and wherein the terminus has a rounding radius (R) which, as measured at the transitional location, is less than 1/10 of the distance between the flat sides.
Dependencies are inferred from the claim text.