Separation device

A sheet manufacturing apparatus comprising:

• a material supply section that supplies a material containing a fiber;
• a defibrating section that defibrates the material supplied from the material supply section to generate a defibrated material;
• a separation device that is arranged downstream relative to the defibrating section in a transporting direction of the defibrated material and includes
• a separation section that includes
• a rotating member that has a plate shape, includes a first surface and a second surface that are in a front and back relationship, and is at least partially composed of a mesh, and to which the defibrated material is supplied onto the first surface, the rotating member being rotatable in a rotation axis of the rotating member, the rotation axis extending along a direction perpendicular to the first surface,
• a suction portion being provided on a side of the second surface of the rotating member and sucking the defibrated material via the mesh to remove foreign matter, and
• a collection section collecting the defibrated material from which the foreign matter on the first surface was removed;
• a weight detection section that detects a weight of the material supplied by the material supply section;
• a controller that controls an operation of the separation section based on a detection result of the weight detection section;
• a loosening section that is arranged downstream relative to the separation device in the transporting direction and includes a sieve which loosens the defibrated material collected by the collection section;
• a web forming section that accumulates, on a belt that faces the loosening section, the defibrated material loosened at the loosening section, thereby forming a web;
• and
• a sheet forming section forming a sheet by cutting the web.