Coil and coil head formation dies for coils with non-conventional terminal convolutions

A coil formation die for use with a coil former machine, the coil former machine having a wire feed mechanism for feeding wire stock from which coils are formed, a coil forming wheel against which wire stock is fed to form the wire into a coiled configuration, a helical guide pin operative to move the wire relative to the coil forming wheel to form a helix in the coiled wire, and a cutting device for cutting a formed coil from the wire stock,

• the coil formation die being attached to the coil former machine at a wire stock feed point and proximate to the coil forming wheel, the helical guide pin, and the cutting device,
• the coil formation die having a body with a wire stock feed hole through which wire stock is passed, and a cavity proximate to the wire stock feed point whereby at least a portion of the wire stock can be formed by the coil forming wheel in the cavity.

A coil head formation die for use with a coil forming machine for forming a coil head in an end turn of a body of a coil having a terminal convolution contiguous with a body of the coil, the coil head formed by operation of one or more punches of the coil forming machine operative to strike a portion of the end turn of the coil against the die while the end turn of the coil and the terminal convolution of the coil are engaged with the coil head formation die, the coil head formation die having a cavity configured to receive a terminal convolution of the coil, and a portion configured to oppose a punch which strikes the end turn of the coil to form a coil head.

A coil formation die for forming a generally helical wire coil with helix of different diameter at different sections of the coil, the coil formation die comprising a die body having a guide wire stock guide through which wire stock is fed to a wire stock exit point to contact a coil forming wheel of a coil forming machine, a cavity in the die body proximate to the wire stock exit point, the cavity having an arcuate configuration against which a portion of the wire stock is formed by the coil forming wheel, and the cavity being positioned relative to a wire cutting device of the coil forming machine so that a formed coil can be cut from the wire stock within the cavity.

A coil head formation die for use with a coil forming machine having a coil head formation station at which a coil is positioned for formation of a coil head by operation of one or more punches on a turn of the coil, the coil head formation die having a die body attachable to the coil head formation station, the die body having a back wall and side sections which extend from the back wall, the back wall and side sections defining a cavity for receiving a portion of a coil, and a punch striking structure for positioning a portion of the coil to be struck by a punch to form a coil head.

A coil head formation die for forming a coil head in a turn of a generally helical coil having a terminal convolution with a diameter different than a diameter of a body of the coil, the coil head formation die having a die body with a rear wall and side walls which define a cavity for receiving a terminal convolution of a coil, a portion of the die body positionable adjacent to a turn of a coil engaged with the die and against which a punch can operate to form one or more bends in the turn of the coil proximate to the terminal convolution.

A coil formation die for use with a coil forming machine for forming a generally helical wire spring coil of varying diameter, the coil formation die having die body and a wire stock guide in the die body through which wire stock is fed to a wire stock exit point past which the wire stock contacts a coil forming wheel of the coil forming machine to coil the wire stock at varying diameters, a cavity in the die body proximate to the wire stock exit point, the cavity having a generally arcuate surface against which at least a portion of the wire is formed by the coil forming wheel.