Apparatus for forming fiber felts

An apparatus for the formation of a fiber felt, comprising:

• means for generating a gas current in which fibers are entrained, said gas current being directed into a receiving enclosure comprised of a perforated conveyor which retains said fibers but allows said gas to pass therethrough,
• a mobile guide duct through which said gas current passes prior to said receiving enclosure, which guide duct may be caused to oscillate, in a movement which may be modified in frequency, amplitude and median direction during operation of the apparatus,
• means for inducing and modifying said oscillation, said means further comprising a connecting rod fixed to and connecting said guide duct with an element exhibiting a rotary movement, the connection to said guide duct being effected by a universal joint to a cardan rigidly affixed to said guide duct, the connection to said element exhibiting rotary movement also being effected through a universal joint to a cardan in such fashion that the cardan is entrained in said rotary motion, said oscillation movement and modification being effected by moving the axis of said rotary movement away from or toward the center of the joint of said connecting rod with said guide duct, wherein said element exhibiting rotary movement, and a motor for inducing said movement are supported on a platform which is adapted for rotary movement about an axis and also longitudinal movement relative to said guide duct, said platform being connected to hydraulic jack means capable of displacing said platform.