Abstract: A machine for the production of paired chains including a feeding assembly for the chains, a welding assembly of the chains and a take-up device for the produced chain. The feeding assembly for the chains includes a transport mechanism thereof suitable for the engagement within corresponding side by side links and for realizing the simultaneous and intermittent advancement without modifying the symmetry of their reciprocal position with respect to the advancement axis. The transport mechanism, constituted in particular of needle-shaped members, is provided with a translational reciprocating motion in the advancement direction and of a reciprocating lifting and lowering motion in an orthogonal direction. The welding assembly, constituted of two equal assemblies in series, provides for the simultaneous movement of means delivering the welding flame and the welding material. The take-up device operates synchronously with the feed of the chains in order to maintain constantly taut the chain during the welding.

Abstract: A device for the automatic control of the feed of a tubular wire, made of precious or non-precious material, in goldsmith industry machine tools, that allows to maintain a predetermined orientation of the continuous longitudinal groove present on the wire itself. The device comprises the use of sensing means, in particular of the optical kind, for following the groove and its displacements within a predetermined operative band. Means are moreover provided for the rotation of the wire around its axis that are driven by said sensing means: when the groove goes out of said operative band, the wire is automatically rotated in one or the other sense up to bring back the groove within said band. This control is presently made upon sight by the operator.