Metallic card wire

Patent metadata

Field	Value
Publication number	US-9404201-B2
Application number	US-201214354421-A
Country	US
Kind code	B2
Filing date	Oct 5, 2012
Priority date	Nov 15, 2011
Publication date	Aug 2, 2016
Grant date	Aug 2, 2016

Abstract

A metallic card wire has an elongated rib portion and teeth. The teeth have a front segment, a top segment and a back segment. The front segment has the connection of the tooth from the elongated rib portion and the front segment including a tip which is actively taking fibers in carding. The top segment has at least one hunch after the tip in the direction of the back segment. If more than one hunch is present the first hunch is the hunch positioned closest to the tip; if only one hunch is present this hunch is the first hunch. The back segment forms the connection of the top segment towards the elongated rib portion and the front segment of the next tooth.

First claim

The invention claimed is:

1. A metallic card wire comprising an elongated rib portion and teeth,
the teeth comprising a front segment, a top segment and a back segment,
wherein the front segment comprises a connection of the tooth from the elongated rib portion and the front segment includes a tip which is actively taking fibres in carding,
wherein the top segment comprises at least one hunch after the tip in the direction of the back segment, wherein if more than one hunch is present a first hunch is the hunch positioned closest to the tip and if only one hunch is present this hunch is the first hunch,
wherein a deepest point of a valley between the tip and the first hunch has a distance from the tip in the direction perpendicular to a length of the card wire of minimum 0.03 mm,
wherein a highest point—or a middle of the zone that is highest—of at least one of the hunches lies within two fictitious lines through the tip of the card wire that make an angle of −5 degrees and of +3 degrees with the longitudinal direction of the card wire, and
wherein the back segment forms the connection of the top segment towards the elongated rib portion and the front segment of the next tooth,
wherein along a full length of the back segment the angle between the back segment and the length direction of the card wire is smaller than a front angle.

2. The metallic card wire as in claim 1 , wherein the first hunch, has in the hunch a minimum radius of curvature of more than 0.1 mm.

3. A metallic card wire comprising an elongated rib portion and teeth,
the teeth comprising a front segment, a top segment and a back segment,
wherein the front segment comprises a connection of the tooth from the elongated rib portion and the front segment includes a tip which is actively taking fibres in carding,
wherein the top segment comprises at least one flattened hunch after the tip in the direction of the back segment, wherein if more than one flattened hunch is present a first flattened hunch is the flattened hunch positioned closest to the tip and if only one flattened hunch is present this flattened hunch is the first flattened hunch, wherein the top segment comprises a valley between the tip and the first flattened hunch, wherein a middle of a flat land of the first flattened hunch lies within two fictitious lines through the tip of the card wire that make an angle of −5 degrees and of +3 degrees with a longitudinal direction of the card wire, and
wherein the back segment is forming the connection of the top segment towards the elongated rib portion and the front segment of the next tooth,
wherein along a full length of the back segment the angle between the back segment and the length direction of the card wire is smaller than a front angle.

4. The metallic card wire as in claim 1 , wherein the card wire is of such a design that it can be made by means of rotary punching.

5. The metallic card wire as in claim 3 , wherein the card wire is of such a design that it can be made by means of rotary punching.

6. The metallic card wire as in claim 1 , wherein the valley located between the tip and the first hunch has a distance from the tip in the direction perpendicular to the length of the card wire of less than 0.15 mm.

7. The metallic card wire as in claim 3 , wherein the valley located between the tip and the first flattened hunch has a distance from the tip in the direction perpendicular to the length of the card wire of less than 0.15 mm.

8. The metallic card wire as in claim 1 , wherein the distance in the direction of the length of the card wire between the tip and the first hunch is less than 17% of a pitch of the teeth.

9. The metallic card wire as in claim 3 , wherein the distance in the direction of the length of the card wire between the tip and the first flattened hunch is less than 17% of a pitch of the teeth.

10. The metallic card wire as in claim 1 , wherein the top segment comprises at least two hunches.

11. The metallic card wire as in claim 3 , wherein the top segment comprises at least two flattened hunches.

12. The metallic card wire as in claim 1 , wherein the front angle which is the angle of the tangent to the front segment at the tip of the tooth with the length direction of the card wire, is between 40 and 80 degrees.

13. The metallic card wire as in claim 3 , wherein the front angle which is the angle of the tangent to the front segment at the tip of the tooth with the length direction of the card wire, is between 40 and 80 degrees.

14. Method of making a card wire as in claim 1 , wherein the card wire is made by means of rotary punching.

15. Method of making a card wire as in claim 3 , wherein the card wire is made by means of rotary punching.

Assignees

• Bekaert Sa Nv
• Groz Beckert Kg

Inventors

• Zhang Yuning

Classifications

• D01G15/88 Primary

  formed from metal sheets or strips · CPC title

• B23D65/02

  Making saw teeth by punching, cutting, or planing · CPC title

• Y10T83/9442

  Notching tool · CPC title