Machine tool having replaceable gang heads

In a gang head machine tool of the type including a base, a slide table mounted on said base for sliding movement longitudinally thereof, a working unit having a driving motor mounted on said slide table, a magazine integral with said working unit storing plural independent gang heads, said magazine including vertically spaced rails encircling said working unit and along which said independent gang heads are moveable, an indexing mechanism for moving said gang heads along said rails to locate a selected gang head in an operative position relative to said working unit, and means for detachably interconnecting said working unit and said selected gang head in operative working relationship;

• the improvement comprising the combination with said gang head machine tool of a second magazine independent of and supplemental to said first magazine, said second magazine being positioned adjacent said working unit and including a storage device for gang heads additional to those stored in said first magazine, a runway interposed between said working unit and said second magazine, and a transfer device moveable longitudinally of said runway and operative to remove a selected gang head from said first magazine and transfer said selected gang head to said second magazine, and operative to transfer any selected one of said gang heads from said second magazine to said first magazine in substitution for said selected gang head removed from said first magazine, said transfer device including means for uncoupling said selected gang head from said first magazine and coupling a gang head selected from said second magazine to said first magazine without disturbing the positioning of the remainder of said gang heads stored in said first magazine and without disturbing the positioning of the working gang head coupled to said machine, said means comprising a wheeled truck moveable longitudinally of rails comprising said runway, a vertically moveable upper support surface of said truck for the reception of a gang head thereon, means for raising and lowering said upper support surface, and roller means incorporated into said upper support surface facilitating the movement of a gang head laterally onto said upper support surface facilitating the movement of a gang head laterally onto said upper support surface and the removal of the gang head laterally of said upper support surface in a direction transverse to the longitudinal axis and direction of movement of said truck.