Patent ID: 6151942
Filing Date: 2000-11-28
Classification: B21F

Abstract:
A spring manufacturing apparatus for manufacturing a spring by feeding a wire, to be formed into a spring, from an end portion of a wire guide, and forcefully bending, winding, or coiling the wire by tools in a spring forming space near the end of the wire guide, said spring manufacturing apparatus comprising:wire feed means for feeding the wire toward the spring forming space by gripping the wire with a pair of rollers and rotating the rollers; andrevolving means for twisting the wire by revolving the rollers and changing a direction of the wire fed from the wire guide, while gripping the wire with the rollers which are supported so as to be revolvable around the wire axis line,wherein said revolving means is fixed to a hollow gear, having a same rotation axis as the wire axis line, with an offset to a side, and revolves while allowing the rollers to rotate by a gear train meshing with the hollow gear, andsaid rollers are driven by the gear train including:a first bevel gear which penetrates through a hollow axis of the hollow gear and has a same rotation axis as the wire axis line;a second bevel gear which meshes with said first bevel gear and has a rotation axis forming an angle of about 90.degree. with a rotation axis of said first bevel gear;a first spur gear having the same rotation axis as said second bevel gear; anda second spur gear which meshes with said first spur gear and is axially fixed to rotation axes of the rollers.