Device for formation of skeined sections on thin metallic wires

Device for the formation of skeined sections on thin metallic wires in which the wire to be skeined extends from an inlet (9) to an anchor point (15) and is placed under traction by a wire-tightening device (2), and in which are present:

• a first pin (12) and a second pin (13) whose points are placed at the same level with the first pin which can be removed from its position and the second pin located on a first shaft with a horizontal axis,
• a wire pulling device (11) in which the wire to be skeined can run, capable of traversing on a horizontal plane placed at the same level as the points of the above mentioned pins,
• a skeined section of wire being achieved through a movement of winding the wire in multiple coils on the above mentioned pins by said wire-pulling device, said movement of winding being followed by a rotation movement of said first shaft around its own axis, the above mentioned movements being commanded by an electronic control system,
• said device being characterized in that the above mentioned anchor point (15) consists of a snub pulley on which the wire rests and that the branch of said wire emerging from said snub pulley is sent to a wire-tightening device (8) controlled by the same electronic control system which controls the skeined wire section formation operation, in said wire-tightener being present the following parts:
• a first pulley (28) on which winds said emerging wire and which is mounted on a second shaft connected to an electromagnetic brake (29) with electromagnetic hysteresis rotated in a direction contrary to the motion given the pulley by the wire,
• a second pulley (27) located above the first pulley (28) and mounted in an idling manner on a pin in turn mounted on a cell (30) sensitive to the load bearing on the pin and sending a signal signifying the load to the control system which regulates the braking action of the brake with hysteresis in such a manner as to maintain the load at a predetermined value,
• the path of the wire coming from the above mentioned snub pulley being characterized in that it descends on a first side of the above mentioned second pulley (27) and then winds on the first pulley (28) and returns to the second side of the second pulley (27) on which it winds for 180° and then again descends on the first side towards a wire winding machine (5) located downstream.