Importance

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Abstract

A planetary device for feeding electrode wiring in welding operations is provided with a housing through which the wire is fed, the central portion of the housing being shaped as a flange with a hub, and the front side thereof being provided with seats housing pistons bearing radially adjustable wire-feeding rollers. The piston heads are in constant contact with the shorter arms of bow-type double-armed levers hingedly affixed to the flange portion of the hub and located perpendicularly to the axis of the electrode wire fed through the housing. The longer arms of the levers contact the surfaces of a cam supported in the hub of the housing for rotation with respect thereto. A torque spring in the form of an Archimedes spiral, disposed between the flange of the housing and the cam, and having its respective inner and outer ends affixed to such members, constantly urges the cam with respect to the housing in such direction as to urge the rollers inwardly into engagement with the electrode wire. Wire is initially fed into the device with the device at rest and with the canted wire-feeding rollers forced apart against the opposition of the spring. The rollers are now brought into engagement with the wire, and the feeding of the wire by the device is started by driving the housing to rotate the canted rollers around the wire and thus to feed the wire forwardly.

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First Claim