Abstract: A rotary feeder having a cylindrical casing having an upper inlet port and a lower outlet port in the vertical direction and a rotor disposed within said cylindrical casing and having a center axis being made eccentric with respect to a horizontal rotor driving shaft supported pivotally on the cylindrical casing, the rotor having further a plurality of blades provided in such that each tip of said blades is able to be in contact with the inner peripheral surface of the cylindrical casing in the vicinity of said upper inlet port or lower outlet port by pressure differential between an upstream passage and a downstream passage.

Abstract: An apparatus for fire protection forming an air-curtain between a supply opening and a exhaust opening, wherein the relationship between the supply opening and the exhaust opening are as follows:1 m.ltoreq.L.ltoreq.5 m0.5 L.ltoreq.L.sub.S .ltoreq.1.5 L1 m/sec.ltoreq.U.sub.L .ltoreq.10 m/sec5 m/sec.ltoreq.U.sub.D .ltoreq.30 m/secU.sub.L .ltoreq.U.sub.0 .ltoreq.U.sub.Dwherein L represents the width of said supply opening in the direction parallel to said escape passage, L.sub.S represents the width of said exhaust opening in the direction parallel to said escape passage, U.sub.L represents the supply air flow velocity, U.sub.D represents the exhaust air flow velocity and U.sub.O represents the additional air flow velocity.

Abstract: A thermo-pneumatic unit for thermal treatment of moving flat materials such as a drying process for cowhides includes a blower which is located on one side of the travelling path of the materials and adapted for generation of thermally adjusted air flow having specified initial direction and mass velocity distribution so that larger mass velocity is focussed upon the portion of each material requiring higher rate of thermal treatment. Ideally, an even thermal effect is obtained over the entire parts of each material and thermal energy loss is effectively avoided even when the material has initial local variance in moisture content or temperature. A collector for blown air on the other side of the travelling path collects the blown air, which assures higher evenness in thermal effect with less thermal energy loss.

Abstract: A level detector is disclosed for detection of whether or not the level of the contents in a container, such as powder, grains, or liquid, attains a predetermined one. Said detector includes a coil and a vibrating plate consisting of a magnetic material or having a magnetic portion which plate is disposed in such a manner that the surface of said vibrating plate is nearly flush with that of the inner wall surface of said container. Said vibrating plate is vibrated by a coil disposed oppositely to said vibration plate and a drive unit to supply a pulse current to said coil. A mechanical vibrating-electric converter which is mounted on said vibrating plate converts the vibrations of said plate caused by said pulse currents into electric signals, and a sensor detects any differences in the amplitude between said electric signals detected when said contents are in contact with said vibrating plate or when said contents are not in contact with said vibrating plate.