Geneva mechanisms provide intermittent indexing in many machines. They are simple, index accurately, and run smoothly. Their limits are impact at start and stop and restricted speed control.
Automated production lines
Assembly indexing: On electronics and small appliance assembly lines, a Geneva mechanism drives the worktable in intermittent rotation. Parts move between stations and stop for assembly.
Packaging indexing: In food and drug packaging machinery, a Geneva mechanism controls the step motion of a container turntable. This coordinates filling, sealing, and labeling.
Machine tools
Tool turret indexing: CNC lathe tool turrets use Geneva mechanisms, such as six-slot or eight-slot types, to switch tool positions automatically. Positioning accuracy can reach ±0.01 mm.
Worktable indexing: Milling machines or multi-axis machining centers use a Geneva drive for a circular worktable. This provides accurate indexing for multi-face machining, with common index angles of 45°, 90°, and 120°.
Light industry machinery
Filling machinery: In beverage fillers, a Geneva mechanism controls the intermittent motion of the preform conveyor chain. It works with filling valves for continuous production. Typical rate is 60 to 120 bottles per minute.
Printing paper feed: Offset press paper feed units use Geneva mechanisms to position paper accurately at the printing station and avoid color registration errors.
Special applications
Inspection equipment: Optical inspection instruments use a Geneva mechanism to index a turntable. Samples stop one by one for CCD scanning.
Film projectors: Traditional film projectors use a four-slot Geneva mechanism to pull film intermittently at the standard 24 frames per second.
Technical parameters and limits
Common slot numbers: 4, 6, and 8. More slots give smoother intermittent motion.
Motion-to-dwell ratio: Usually 1:3, meaning dwell time is three times the motion time.
Limits: At high speed, the roller hits the slot edge and creates impact noise. This makes the mechanism unsuitable for indexing rates above 300 times per minute.
Note: High-end equipment is moving toward servo motor plus cam indexer combinations instead of traditional Geneva mechanisms to meet higher speed and flexible control requirements. Hansheng Automation also supplies cam indexers as a main product line and can provide them for these indexing applications.
