Automated screwfeeders also allow assemblers to address ergonomic concerns. That laborious process requires assemblers to continually pick up and set down screwdrivers. Such repetitive motions can lead to musculoskeletal injuries and other types of occupational risks outlined by new OSHA standards on ergonomics. How Feeders Work Automated screwfeeders are available in many different sizes, including benchtop and floor units. Rotary orienting feeders use centrifugal force to move screws to an outside flange where part orientation is accomplished.
Electromagnetic feeders use vibration to move screws, but they are slower.
To achieve maximum feed rate, the bowl should be filled to the half-full level. The next step is to get parts to start moving. Motion can be imparted by gravity, centrifugal force, tumbling, air pressure or vibration. Each screw is automatically qualified to allow only screws within specifications to queue. Any rejects are ejected.