Patent ID: 7669515

Claim:
A magnet-type rodless cylinder comprising: a cylinder tube made of a nonmagnetic material; pistons disposed in the cylinder holes formed in said cylinder tube so as to move therein in the axial direction of the cylinder tube; a slider made of a nonmagnetic material and is disposed on the outer circumferential surface of said cylinder tube so as to move in the axial direction of the cylinder tube along the outer circumferential surface of the cylinder tube; inner magnets disposed in said pistons and outer magnets or a magnetic material disposed in said slider, the magnetic attracting force acting between said inner magnets and said outer magnet or the magnetic material enabling said slider to move following the movements of said pistons; wherein said cylinder holes and said pistons are arranged in a plurality of sets in parallel, and a member made of a magnetic material is disposed between at least a pair of neighboring cylinder holes among the cylinder holes along the axial direction of the cylinder holes.