(under subclass 13) Subject matter having the feed regulating mechanism operated by electro-responsive means, such as an electromagnet, and having the switch which completes the shunt circuit actuated by the movement of the feed regulating mechanism.
(1) Note. Continue the search in subclass 12 of this class.
(2) Note. In most of the devices in this subclass, the feed regulating mechanism is given an abnormal movement when the electrodes are either consumed or fail to feed, and the abnormal movement of the feed regulating mechanism is utilized to operate the shunt circuit completing switch to its circuit completing position.
(3) Note. This subclass does not include discharge devices having the switch operated by means of a cam, projection, detent or other means carried by the electrode rod, or electrode supporting means, or some other part of the discharge device which moves in relation to the movement of the electrode so that the switch is operated only when the electrode has been moved to a predetermined position. Discharge devices having only this type of shunt switch operation to complete the circuit through the shunt impedance are in subclass 13.
