Automatic welding apparatus

An automatic welding apparatus comprising a pair of spaced-apart, but interconnected, turn frames mounted on a stationary frame to be swingable around a horizontal axis passing through the two frames, wherein imaginary lines parallel to said horizontal axis extending between the outer peripheries of said turn frames define an imaginary cage;

• a beam guide mounted between said turn frames and extending in said horizontal direction;
• a first member mounted on said beam guide for slidable movement in said horizontally axial direction;
• a second member mounted on said first sliding member for slidable movement in a second direction orthogonal to said horizontal direction;
• a third member mounted on said second sliding member for slidable movement in a third direction orthogonal to said horizontal direction and to said second direction;
• a welding torch;
• a fixture means for holding said torch, mounted on said third sliding member;
• and a workpiece fixture mounted between said turn frames for mounting a work-piece thereto within said imaginary cage, wherein said torch fixture is made for rotation around an axis in said second direction or said third direction, so that said workpiece fixture and said torch fixture means can be positioned relative to one another in three dimensions within said imaginary cage and so that the attitudes of both these members and the imaginary cage, can be changed, in unison, relative to the stationary frame.

An automatic welding apparatus comprising a work piece fixture rotatable around a first horizontal axis;

• a welding torch;
• a fixture means for holding said welding torch;
• a stationary main frame;
• a pair of turn frames mounted on said stationary main frame to be swingable around a second horizontal axis passing through said turn frames, said workpiece fixture and said fixure means being mounted between said turn frames;
• and means mounted on said turn frames for following the attitude changes of said turn frames and for positioning said torch fixture means in a spatial position in three dimensions relative to said turn frames including three members supported by said turn frames for slidable movement in respectively said horizontal direction, a second direction orthogonal to said horizontal direction and a third direction orthogonal to said second direction, said torch fixture means being rotatable around an axis in said second direction or said third direction;
• said stationary main frame having a pair of supports, each positioned adjacent a turn frame with the turn frame being swingably mounted thereon;
• and a turn-frame driving means mounted on either said stationary main frame or a turn frame for engaging the other of said stationary main frame or turn frame to swing said turn frames relative to said stationary main frames.

An automatic welding apparatus comprising:

• a pair of turn frames adapted for rotation about a horizontal axis through an angle greater than 90.degree.;
• a guide means mounted on and between said turn frames so that its attitude is changed in unison with that of said turn frames and being parallel to said horizontal axis;
• a welding torch positioning assembly mounted on said guide means so that its attitude is changed in unison therewith including:
• (1) A first sliding member mounted on said guide means so as to be movable in a first direction parallel to said horizontal axis;
• (2) a second sliding member mounted on said first sliding member so as to be movable in a second direction orthagonal to said first direction;
• (3) a third sliding member mounted on said second sliding member so as to be movable in a third direction orthogonal to said first and said second directions;
• (4) a welding torch fixture attached to an end of said third sliding member so as to be rotatable about an axis parallel to said third direction of movement;
• a welding torch mounted to said torch fixture so that said torch may be located in a predetermined position with respect to a workpiece holder.