A transfer device for picking up and placing resin preimpregnated composite
plies. The transfer device includes a movable transfer head with a
plurality of transfer feet movably mounted within it. Each transfer foot
includes a support cage with a plurality of spaced posts extending between
upper and lower ends. A mounting plate is located on the support cage. A
pickup foot extends from the lower end of the support cage and has a
channel formed through it which communicates with an opening in the lower
end of the support cage. The pickup foot includes a tip end adapted to
contact the resin preimpregnated composite ply. A valve is mounted within
the support cage and includes a valve member located adjacent to the
opening in the lower end of the support cage. The valve member is movable
between a closed position and an open position. A spring surrounds at
least a portion of the periphery of the transfer foot and biases the
transfer foot into the transfer head. A pressure source supplies a
pressurized medium to the valve for actuating the valve member. A stripper
is preferably attached to the valve and actuatable in conjunction with the
valve member for dislodging a composite ply from the tip end. An actuation
assembly is mounted to the transfer foot and adapted to move the transfer
foot with respect to the transfer head in response to a flow of
pressurized air.