TURN BAR

To provide a turn bar which does not need to arrange an auxiliary device in the vicinity of an outer peripheral surface, can be arranged in a narrow space, and is inexpensive.SOLUTION: A turn bar 1 includes: a cylindrical roll body 2; and a ring member 4a-p having a circumferential groove 6 externally mounted on the roll body, constituted by a porous material having air permeability, and extending in a circumferential direction on an inner peripheral surface. The roll body includes an air supply passage 30a-p which has, in its inside, a plurality of pressurized gas supply chambers 22 extending from one end toward the other end in a longer direction, constituted in an air-tight manner, and receiving supply of pressurized gas from an external pressurized gas supply mechanism and allows one of the plurality of pressurized gas supply chambers and the circumferential groove of the ring member to be in fluid communication. Each of the plurality of circumferential grooves of the ring member is in fluid communication with any one of the plurality of pressurized gas supply chambers by the air supply passage.SELECTED DRAWING: Figure 1 【課題】外周面近傍に補助器機を配置する必要が無く、狭い空間にも配置可能で安価なターンバーを提供すること。【解決手段】本発明によれば、ターンバー１であって、円筒状のロール本体２と、ロール本体に外装され通気性の多孔質材料で構成され内周面に周方向に延びる周方向溝６を有しているリング部材４ａ-ｐと、を備え、ロール本体は、一端から他端に向かって長手方向に延びそれぞれが気密に構成され外部の加圧気体供給機構から加圧気体の供給を受ける複数の加圧気体供給室２２を内部に有し、複数の加圧気体供給室の一つと、前記リング部材の周方向溝とを流体連通する給気通路３０ａ-ｐを備え、複数のリング部材の周方向溝の各々は、給気通路によって複数の加圧気体供給室のいずれかと流体連通しているターンバーが提供される。【選択図】図１