Koganei Corporation

Howa Machinery, Ltd.

Naoki Minowa

Hiroshi Yoshida

Mitsuo Noda

Akiyoshi Horikawa

Tsuyoshi Yonezawa

A pair of cylinder holesare formed in a cylinder tubein the axial direction, a slitis formed between these cylinder holes, and an iron plateis inserted in the slit covering the whole range of the movement of the pistonsin the cylinder holes. Spacersmade of a synthetic resin are interposed on both sides of the iron plateto reliably hold the iron platein the slit. The iron platedisposed between the cylinder holes works to decrease the repulsive force acting between the inner magnetsof the pistons and produce an attracting force between the iron plateand the inner magnets, and a contact surface pressure between the wear ringsof the pistonsand the wall surfaces of the cylinder holescan be adjusted to a suitable value.

Magnet type rodless cylinder

A pair of independent cylinder holesare formed in a cylinder tubeof a flat outer shape. When a pressurized fluid is alternately supplied into the cylinder tubethrough a portformed in an end cap, the internal pressure for operating the cylinders acts uniformly on the cylinder tubegreatly decreasing stress and deflection of the cylinder tube

Repulsive magnetic forces in the axial direction of cylinder tubes act between the rowsof inner magnets of pistonsaccommodated in two cylinder tubes, and the inner magnetsof the pistonscome to a halt being slightly deviated relative to the outer magnetsin the axial direction of the tube. Due to this deviation, a magnetic holding force Fc is produced between the inner and outer magnets. Since the magnetic holding force Fc is produced in a static state, a smooth movement can be attained from a static state suppressing the occurrence of a stick slip phenomenon at the start of movement as compared to the prior art, which does not produce the magnetic holding force in a static state.

A magnet type rodless cylinder provided with a slide magnetically coupled with a piston arranged in a cylinder tube and a slide able to move outside of the cylinder tube. The slide has a connection mount detachably attached to it. When attaching the connection mount, the position where the connection mount and an end cap strike/contact becomes the striking/contacting position of the piston. When using a rodless cylinder without a connection mount, the distance between the slide and an end cap when the piston is positioned at the striking/contacting position becomes longer than the striking/contacting distance due to the removal of the connection mount. Therefore, external dampers able to strike/contact the slide are detachably attached to the end caps at the slide sides. Due to this, regardless of the use or nonuse of a connection mount, the piston and slide can always stop at the striking/contacting position.

Growing community of inventors

Tokyo, Japan

Naoki Minowa