Apparatus and method for forming a wire loop

Patent metadata

Field	Value
Publication number	US-10014644-B2
Application number	US-201113213258-A
Country	US
Kind code	B2
Filing date	Aug 19, 2011
Priority date	Aug 19, 2010
Publication date	Jul 3, 2018
Grant date	Jul 3, 2018

Abstract

An apparatus for the formation of a wire loop comprises a wire drive for advancing a wire and a loop layer to grip a first end of the wire and to lay a wire loop. When the wire is advanced, the wire loop is formed into a selected size. The apparatus also includes a pull-out gripper and a sensor device, the pull-out gripper being configured to grasp the wire of the wire loop and, after grasping the wire of the wire loop, move relative to the loop layer, thereby tensioning the wire loop in a longitudinal direction. The sensor device can detect a twist in the wire loop.

First claim

We claim:

1. An apparatus for forming a wire loop, the apparatus comprising:
a wire drive configured to advance a wire in a longitudinal direction;
a loop layer configured to grip a first end of the wire and to lay a wire loop, wherein a size of the wire loop is set by advancing the wire; and
a pull-out gripper configured to receive the wire loop by grasping an area at a curved portion of the wire loop spaced from the first end and move relative to the loop layer to tension the wire loop in the longitudinal direction, when the pull-out gripper is in a closed state, the grasped curved portion area of the wire loop extends between the two gripper fingers and is free to move relative to the two gripper fingers, and
wherein a portion of the pull-out gripper is selectively free turning within a certain angle about a longitudinal axis parallel to the longitudinal direction, the pull-out gripper includes a gripper and a sensor device, the sensor device configured to detect a twist in the wire loop.

2. An apparatus for forming a wire loop, the apparatus comprising:
a wire drive configured to advance a wire in a longitudinal direction;
a loop layer configured to grip a first end of the wire and to lay a wire loop, wherein the loop layer is positionable to grip the first end of the wire when the wire is advanced in the longitudinal direction by the wire drive, the loop layer configured to make a swivel movement along a path and lay the wire loop, and a size of the wire loop is set by advancing the wire; and
a pull-out gripper configured to receive the wire loop by grasping an area at a curved portion of the wire loop spaced from the first end and configured to move relative to the loop layer to tension the wire loop in the longitudinal direction when the wire is further advanced by the wire drive, wherein the pull-out gripper moves away from the wire drive and the loop layer when the wire is further advanced by the wire drive;
wherein a portion of the pull-out gripper is selectively free turning within a certain angle about a longitudinal axis parallel to the longitudinal direction, the pull-out gripper includes a gripper and a sensor device, the sensor device configured to detect a twist in the wire loop.

3. The apparatus of claim 2 , the sensor device being configured to detect a direction of the wire.

4. The apparatus of claim 2 , the sensor device being configured to detect a twist-free state of the wire loop.

5. The apparatus of claim 2 , the sensor device configured to contactlessly detect a direction of a twist in the wire loop.

6. The apparatus of claim 2 , the sensor device configured to contactlessly detect a twist-free state of the wire loop.

7. The apparatus of claim 2 , the gripper comprising two gripper fingers, the two gripper fingers being displaceable into an open state.

8. The apparatus of claim 7 , the gripper further comprising two gripper jaws, the two gripper jaws being displaceable along a guide to place the two gripper fingers into the open state.

9. The apparatus of claim 2 , the gripper comprising two gripper fingers, the two gripper fingers being coupled to a fork piece, the fork piece being at least partially rotatable about the longitudinal axis parallel to the longitudinal direction.

10. The apparatus of claim 2 , wherein the portion of the pull-out gripper is selectively free turning up to 70 degrees about a longitudinal axis parallel to the longitudinal direction.

11. A wire-loop method for forming a wire loop, the method comprising:
advancing a wire in a longitudinal direction using a wire drive;
laying a wire loop with a loop layer configured to grip a first end of the wire, wherein a size of the wire loop is set by advancing the wire;
receiving the wire loop using an open pull-out gripper;
closing the pull-out gripper about an area at a curved portion of the wire spaced from the first end to loosely grasp the area; and
pulling the wire loop using the pull-out gripper to tension the wire loop in the longitudinal direction, wherein a portion of the pull-out gripper is selectively free turning within a certain angle about a longitudinal axis parallel to the longitudinal direction, the pull-out gripper includes a gripper and a sensor device, the sensor device configured to detect a twist in the wire loop.

12. The method of claim 11 including detecting a twist in the wire loop using the sensor.

13. The method of claim 12 including de-twisting the wire loop, a number of de-twisting turns being based on the detected twist.

14. The method of claim 11 including detecting a direction of a twist in the wire loop using the sensor.

15. The method of claim 14 including de-twisting the wire loop, the direction of the de-twisting being based on the detected direction of the twist.

16. The method of claim 11 including detecting a twist-free state of the wire loop using the sensor.

17. The method of claim 11 further comprising:
feeding the wire loop into a de-twisting device with a lateral movement relative to the longitudinal direction; and
retracting the pull-out gripper before or during the lateral movement.

Assignees

• Eggimann Reto
• Braun Alfred
• Komax Holding Ag

Inventors

• Eggimann Reto
• Braun Alfred

Classifications

• H10W72/0711

  Apparatus therefor · CPC title

• H01R43/052

  with wire-feeding mechanism · CPC title

• B21F9/002

  to maintain tension in the wire, e.g. to pull the wire taut · CPC title

• B21F1/00

  Bending wire other than coiling; Straightening wire · CPC title

• H01R43/28 Primary

  for wire processing before connecting to contact members, not provided for in groups H01R43/02 - H01R43/26 · CPC title