초록 ▼

The invention relates to a bending apparatus for wires having a cross section which varies according to their lengths, and comprising two cylindrical sections and an interleaved conical section. The wire is bent by means of three rollers. The bending roller is mounted on a carriage and determines th

The invention relates to a bending apparatus for wires having a cross section which varies according to their lengths, and comprising two cylindrical sections and an interleaved conical section. The wire is bent by means of three rollers. The bending roller is mounted on a carriage and determines the bending degree imparted to the fed wire. The wire is bent despite its variable diameter so that it is deposited with a regular curvature on the reception plate. To this effect, the curvature of the conical section is changed between the correct curvature of the thinner cylindrical section of the wire and that of the thicker cylindrical section of the wire. It only requires a simple switching at an appropriate time to obtain a sire bobbin which may be deposited on the reception plate. The appropriate switching time is situated between 20% and 60%, but preferably between 30% and 40%, and is calculated from the beginning of the wire diameter increase.

대표청구항 ▼

A process for bending and coiling wire with at least one cylindrical section and at least one longitudinal section having an increasing or decreasing cross-section over its length wherein the wire is bent while being fed between at least three bending rollers with approximately equal curvature along

A process for bending and coiling wire with at least one cylindrical section and at least one longitudinal section having an increasing or decreasing cross-section over its length wherein the wire is bent while being fed between at least three bending rollers with approximately equal curvature along the range of cylindrical longitudinal sections, comprising the steps of coiling said wire by feeding said wire between three bending rollers; changing the amount of bending of the wire during coiling within the range of the longitudinal sections having increasing or decreasing cross sections at a point on the longitudinal section having a variable diameter by means of measuring said change in diameter of said wire by a measuring device and switching from the amount of bending appropriate for the smaller ultimate diameter to the amount of bending appropriate for a larger diameter, or vice versa, based upon said measuring; the switching taking place at a point at which the minor ultimate diameter of the section having the varying diameter is located a predetermined distance from the bending rollers, which distance is 20% to 60% of the length of the section with the varying diameter.