Patent ID: 7644648

Claim:
A magnet-type rodless cylinder comprising: a plurality of pistons accommodated in a plurality of cylinder holes formed in a cylinder tube made of a nonmagnetic material so as to move in an axial direction of the cylinder tube; and a slide body arranged on an outer circumference of the cylinder tube that is moveable in the axial direction of the cylinder tube and that is magnetically coupled to said pistons; wherein, the plurality of cylinder holes are independent and are formed in said cylinder tube at close positions, said pistons being arranged in the cylinder holes, said cylinder tube has a noncircular outer shape in cross section, said pistons are each provided with a plurality of inner magnets arranged in the axial direction of the cylinder tube and are magnetically coupled to said slide body via said inner magnets; and said cylinder holes are arranged at positions which are close to each other to such a degree that the pistons accommodated in the cylinder holes are held at positions deviated relative to each other in the axial direction of the cylinder tube due to the repulsive magnetic force acting among the inner magnets of the pistons in the axial direction of the cylinder tube.