Metal deforming – By deflecting successively-presented portions of work during... – To form helical coil or tube
Patent
1992-10-26
1993-12-14
Echols, P. W.
Metal deforming
By deflecting successively-presented portions of work during...
To form helical coil or tube
72452, B21F 310
Patent
active
052691659
ABSTRACT:
A process for making coiled springs by intermittently rotating feed rollers with a wire held therebetween to feed the wire through a wire guide into engagement with a bending die at the outlet of the wire guide, thereby coiling the wire is provided, wherein as a follower of a cam unit moves toward the base circle of a pitch cam by the force of a spring, a pitch tool extends in an extending direction for pitching, and as the follower of the cam unit moves away from the base circle of the pitch cam against the force of the spring, the pitch tool is retracted in a retracting direction, whereby pitching is completed. The apparatus for practicing this process comprises a cam unit having a pitch cam, a connecting rod following a follower of the cam unit, a spring for exerting a spring force to engage the follower of the cam unit with the pitch cam, a pitch tool extendible through a pitching lever by the force of the spring to determine the pitch of the coiled spring to be formed, a spring for constantly exerting a spring force to retract the pitch tool, a stopper for independently restricting the pitch tool to the position to which it is extended or to its reference position, and a roller rotating mechanism for intermittently rotating feed rollers at a given angle in a certain direction, the rollers feeding a wire to a bending die positioned in front of the pitch tool.
REFERENCES:
patent: 3402584 (1968-09-01), Cavagnero
patent: 3427838 (1969-02-01), Rimmer
patent: 3472051 (1969-10-01), Bergevin
patent: 4594869 (1986-06-01), Matsuoka
patent: 4991277 (1991-02-01), Itaya
patent: 5025648 (1991-06-01), Matsuoka
Echols P. W.
MEC Machinery Co., Ltd.
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