Device for bending conical wires

An apparatus for bending and coiling wire with at at least one cylindrical section and at least one longitudinal section having an increasing or decreasing cross-section over its length, comprising

• a machine frame having
• at least three rollers mounted thereon, one of said rollers is
• a bending roller which is mounted on
• a carriage, and is guided and attached onto the machine frame;
• and
• a mechanical drive for driving the carriage,
• two stops which limit the two end positions of the driven carriage which determines the shape of the wire passing through the rollers on the carriage;
• a measuring apparatus arranged on the machine frame and operatively connected through a switching mechanism to said bending roller;
• and
• a switching mechanism operatively connected to the carriage for positioning said bending roller alternately at said two stops thereby 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 measurements obtained by said measuring apparatus,
• 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.