An extruding apparatus for food materials having a filling material and a
wrapping material extrudes and envelops the filling material with the
wrapping material. An internal cylinder supplies the filling material
while a concentrically arranged external cylinder creates an annular
space for extruding and enveloping the material supplied. The wrapping
material is fluidized by a fluidizer accommodated in the annular space. A
driving mechanism is sealed from the fluidizer and drives the fluidizer
in the annular space. The driving mechanism is driven by a transmission
mechanism. A storage space section near the seals prevents wrapping
material from penetrating the driving mechanism.