Coil-spring manufacturing apparatus
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United States of America Patent
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Jun 16, 2015
Grant Date -
May 30, 2013
app pub date -
Jan 25, 2013
filing date -
Jul 30, 2010
priority date (Note) -
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status (Latency Note)
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Abstract
A coil wire material is bent by a first roll, a second roll, and a third roll. The bent coil wire material is pressed in a screwing direction, to shape a coil spring having a desired diameter and a pitch. A desired pitch can be accurately formed in a manner that a second roll provided on a downstream side of a conveying direction of the coil wire material is configured to be able to move hack and forth along the screwing direction of the coil spring and to be tiltable about an axis of rotation parallel to the conveying direction of the coil wire material.
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