Automatic centrifugal barrel finishing machine

An automatic centrifugal barrel finishing machine of the type including a turret capable of rotating on its vertical central shaft with a high speed and carrying a plurality of barrels open at top containing therein workpieces to be treated and treating media for treatments such as surface finishing, milling, deburring, stirring, chemical processing and the like, wherein the improvement comprises:

• a housing;
• a plurality of barrel holding plates connected to the turret rotatably and revolvably relative to the turret shaft, for holding the barrels tightly thereunder to keep the same airtight or watertight;
• dual rotary shaft structure carrying said barrel holding plates therethrough, said structure comprising an outer hollow shaft for driven connection with said turret central shaft and an inner shaft having chuck means at a lower end thereof;
• barrel supporting bottom plate for carrying barrels thereon, having a central barrel mounting shaft therethrough disengageably to be held by said chuck means;
• a pair of clutch means including a first clutch connected to the other upper end of said inner shaft and a fluid-operated second clutch for engaging with said first clutch;
• and
• indexing means operable for vertical and rotary movement, comprising a vertical rotary shaft in parallel with said turret central shaft, indexing motion supply means connected to the upper end of said vertical rotary shaft for causing said rotary shaft to rotate with indexing stops through an angle of 360.degree., indexing table mounted to said rotary shaft at the mid-position thereof for vertical movement along the length of said rotary shaft and for indexed movement with said rotary shaft, barrel reversible means mounted to said indexing table for reversing the barrels for discharging the contents thereof, and fluid-operated cylinder means operated for moving said indexing table in vertical directions.