Abstract: A sewing machine including a needle holding device which holds a sewing needle, a sheet holding device which holds one or more work sheets, and a moving device which moves the sheet holding device relative to the needle holding device, the moving device including a drive source which produces a drive force, one or more cylindrical cams which are connected to the drive source and each of which is rotatable about an axis line by being driven by the drive source, each cylindrical cam having a pair of opposite spiral cam surfaces formed on an outer circumferential surface thereof, and one or more cam followers which are connected to the sheet holding device and each of which is engaged with the spiral cam surfaces of a corresponding cylindrical cam such that the cam follower is movable along the cam surfaces and is substantially immovable in directions perpendicular to the cam surfaces, the cam follower being moved in a drive-force transmitting direction substantially parallel to the axis line of the cylindrical

Abstract: A filtration concentration apparatus and method by which a high operation efficiency of a filter is assured are disclosed. The filtration concentration apparatus comprises an original liquid intake path interconnecting a primary side of a pump and an original liquid storage tank, an original liquid supply path interconnecting a secondary side of the pump and an original liquid chamber of a filter, an original liquid return path interconnecting the secondary side of the pump and the storage tank, an original liquid recovery path interconnecting the original liquid chamber and the primary side of the pump, a liquid discharge path interconnecting a bottom portion of the original liquid chamber and a waste liquid tank, and a control unit for controlling the recovery path to open when the intake path and the supply path are open and controlling the intake path and the supply path to close when the recovery path and the return path are open.