Magnetic Position Sensors Reed switches (sense permanent magnet)

Magnetic Position Sensors  Reed switches (sense permanent magnet)

Magnetic Position Sensors Reed switches (sense permanent magnet) Inductive proximity sensors (eddy current)

Hall Sensors (sense permanent magnet) Other Discrete Position Sensors

capacitive ultrasonic variable reluctance (coil around magnet, senses moving ferrous

material) Inductive Proximity Sensor

Inductive Proximity Sensors Hall Sensors Hall effect:

constant voltage forces a constant current in semiconductor sheet magnetic field flux lines

perpendicular to current cause proportional voltage across sheet. discovered by E.F.Hall in 1879

Linear sensor needs voltage regulator and amplifier Switch also needs threshold circuit, with hysteresis

Hall Switch Magnet motion head-on

bypass or slide-by Total effective air gap (TEAG)

Sensitivity, Hysteresis, & Temperature Care & Feeding of Machines

Feeding parts vibratory feed bowls conveyors pick & place

Material obtained from: Boothroyd, Automatic Assembly Ken Goldberg, UCB Industrial Engr Oper. Rsrch (http://www.ieor.berkeley.edu/~goldberg/index.htm

l) Robert-Paul Berretty, PhD thesis, Utrecht (http://www.library.uu.nl/digiarchief/dip/diss/1940512/full.pdf)

Bowl Feeders Bowl Feeders

Bowl Feeders Bowl Feeders

Bowl Feeders Bowl Feeders Design Factors

Part symmetry Selector efficiency E=Fo/Fi Recirculation effects

Bowl Feeders - Trap Design Bowl Feeders - Trap Design Conveyors

Orienting with pins or fences Conveyor part orientation - pins

Conveyor part orientation - pins Conveyor part orientation - pins

Conveyor part orientation fences Any polygonal part can be oriented up to symmetry

by a fence design Conveyor part orientation fences

Conveyor part orientation fences Conveyor part orienting - 3D parts

Designing Parts for Feeding Symmetry Asymmetry Tangling

Shingling Wedging Symmetry

Asymmetry Tangling

Shingling Wedging

Designing for Insertion

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