Sewing needle with double twist groove

Patent metadata

Field	Value
Publication number	US-9758911-B2
Application number	US-201515113350-A
Country	US
Kind code	B2
Filing date	Jan 19, 2015
Priority date	Jan 21, 2014
Publication date	Sep 12, 2017
Grant date	Sep 12, 2017

Abstract

A sewing needle is used in a sewing machine. The sewing needle has a working portion with a needle eye and a region which tapers into a needle tip. The needle eye passes through a needle body in a transverse direction perpendicularly to a longitudinal axis of the needle body. A twist groove is recessed in a front face of the needle body relative to the outer contour of the needle body, the twist groove extending in the direction of the needle tip from the needle eye. The twist groove is formed by a thread groove. The twist groove is preferably symmetrical relative to a first longitudinal central plane spanned by the longitudinal axis and the transverse direction. The thread groove has a groove portion adjacent to the needle eye and two end portions, each having a thread groove opening, remote from the needle eye.

First claim

The invention claimed is:

1. A sewing needle for a sewing machine, comprising:
a needle body extending along a longitudinal axis, said needle body comprising a holding portion for clamping the sewing needle in the sewing machine and a working portion including a needle tip of the sewing needle,
a needle eye provided in the working portion of the needle body, said needle eye completely extending through the needle body,
a thread groove provided between the needle eye and the needle tip and which terminates, on a lower edge of the needle eye facing the needle tip, in the needle eye, and
wherein the thread groove has, at a distance from the needle eye, a first thread groove opening and a second thread groove opening, said first groove opening and said second groove opening being arranged on different sides of a first longitudinal central plane through the needle body.

2. The sewing needle according to claim 1 , wherein a distance between the first thread groove opening and the second thread groove opening in a lateral direction at a right angle with respect to the first longitudinal central plane is greater in at least a few points than a width of the thread groove in the lateral direction at a point adjacent the needle eye.

3. The sewing needle according to claim 1 , wherein one dimension of the thread groove in a lateral direction at a right angle with respect to the first longitudinal central plane increases starting from the needle eye in the direction of the two thread groove openings.

4. The sewing needle according to claim 1 , wherein the thread groove has a groove portion that directly adjoins the needle eye.

5. The sewing needle according to claim 4 , wherein the groove portion is delimited on opposite sides by one lateral wall region of a lateral wall delimiting the needle eye.

6. The sewing needle according to claim 4 , wherein a groove bottom of the groove portion approaches the longitudinal axis starting from the needle eye in the direction of the needle tip.

7. The sewing needle according to claim 4 , wherein the thread groove has two end portions that extend between respectively one thread groove opening and the groove portion.

8. The sewing needle according to claim 7 , wherein the end portions of the thread groove are provided in the region of a working portion, said region tapering toward the needle tip.

9. The sewing needle according to claim 7 , wherein a width of the end portions is smaller than a width of the groove portion.

10. The sewing needle according to claim 7 , wherein an elevation is provided between the two end portions of the thread groove.

11. The sewing needle according to claim 10 , wherein the elevation transitions, without edges, into the two end portions of the thread groove.

12. The sewing needle according to claim 10 , wherein the elevation is convexly curved and has a vertex on the first longitudinal central plane.

13. The sewing needle according to claim 1 , wherein the thread groove does not extend through a second longitudinal central plane through the needle body, said plane being oriented at a right angle with respect to the first longitudinal central plane.

14. The sewing needle according to claim 1 , wherein the needle eye is delimited on opposite sides of the first longitudinal central plane by one lateral wall that borders the outer contour surface of the needle body on one lateral wall edge.

15. The sewing needle according to claim 14 , wherein the lateral wall edge is at a maximum distance from a second longitudinal central plane oriented at a right angle with respect to the first central longitudinal plane, said distance being greater than a maximum distance of the elevation with respect to the second longitudinal central plane.

Assignees

• Groz Beckert Kg

Inventors

• Bach Dirk
• Haug Kai Uwe
• Merks Alexander

Classifications

• D05B85/02 Primary

  with slotted eyes {, i.e. with a slit leading to the eye for thread insertion} · CPC title

• D05B85/00 Primary

  Needles (surgical needles A61B17/06; manufacture of needles B21G1/00) · CPC title