Sankyo's Do Series ring indexer features cast iron housings with a large stationary center bore. The center and outer rings can support stationary dials above or below the indexing dial. Since both inner and outer rings are the same housing, the rigidity is sustained. The thin housing makes a small footprint and designed as the foundation for a rotary assembly machine. Robots with other peripheral equipment are easily mounted to this versatile unit.
A globoidal cam rotates Sankyo made needle bearing type cam followers. Optimizing the cam follower diameter inherently maximizes torque transfer and extends the life hours due to fewer rotations with increased surface contact. Indexing incremental stops range from 16 to 60 to support large diameter dials from 2250 to 7200 mm (7.3 to 23.5 feet). This allows plenty room for inspection stations between each subassembly. Multiple index periods offer continuous or on demand duty cycles with the indexing ring locking in position within 20 to 30 arc seconds during the dwell period. These versatile units index in both directions or oscillate. The Ro Series can perform non-patterned motions with a continuous lead cam using servo driven motor or provide incremental stops less than 16. Most units are driven with geared motors that are within the height of the index unit housing or Sankyo's R series worm reducer as shown. Timing cam packages are available with inexpensive photo beam sensors or proximity switches for wash down (IP67/NEMA-6/6P) applications.