Abstract: A recording apparatus includes a tank including a chamber configured to store liquid to be supplied to a recording head that ejects the liquid and a filling port from which the liquid is injected into the chamber, and an injection auxiliary member configured to assist injecting of the liquid into the chamber from the filling port, the injection auxiliary member including a first and a second flow channels each defined by a first or a second upper end portion that opens toward outside of the tank and a first or a second lower end portion that opens toward inside of the tank, wherein the second flow channel has an expansion portion arranged in a middle portion between the second upper end portion and the second lower end portion and configured to form a step to expand a cross-sectional area.

Abstract: A rolling device in which damage such as seizure or wear is less liable to occur and which has a long life, even when used under severe conditions such as high speed, heavy load, high temperature and insufficient lubrication. A thrust needle roller bearing includes an inner ring 1, outer ring 2, and a plurality of rolling elements 3 rollably arranged between a raceway surface 1a of inner ring 1 and a raceway surface 2a of outer ring 2. A lubricant film consisting of a solid lubricant is coated over an area equivalent to an area ratio of 75% or more of at least one member of the group consisting of raceway surface 1a of inner ring 1, raceway surface 2a of outer ring 2, and a rolling contact surface 3a of rolling element 3. The thickness of the lubricant film is preferably 0.05 ?m or more and 8 ?m or less.

Abstract: A ball screw in which surface hardness of balls is higher than both of surface hardness of a ball screw groove of a screw shaft and surface hardness of a ball screw groove of a nut, and a solid lubricant film is formed on a surface of the balls with a thickness of 1 ?m or more and 5 ?m or less. Further, cross-sectional shape of grooves 11 and 21 of a screw shaft 1 and a nut 2 is a Gothic arc. A ratio (R/D) of a radius (R) of the arcuate cross-section of the groove 11 with respect to diameter (D) of balls 2 is set to 51.0% or more and 52.0% or less. The solid lubricant film made of MoS2 is formed on the surface of the balls 3 with a thickness of 0.5 ?m and 3.0 ?m or less.

Abstract: To surely and easily secure a return tube to a nut and prevent the return tube from floating and expanding when circulating failure of balls occurs. The ball screw device has a screw shaft having a helical shaft raceway groove on the outer face thereof, a nut having a nut raceway groove on the inner face so as to oppose to the shaft raceway groove, a load path formed by the shaft raceway groove and the nut raceway groove, balls rotatably mounted in the load path, a communicating member communicating both ends of the load path to guide the balls exterior of the nut and having a bent portion; a tube fixture for fixing the communicating member to the nut and a reinforcement member for receiving stress applied to the bent portion of the communicating member on an outer face of the tube fixture.

Abstract: A rolling device in which damage such as seizure or wear is less liable to occur and which has a long life, even when used under severe conditions such as high speed, heavy load, high temperature and insufficient lubrication. A thrust needle roller bearing includes an inner ring 1, outer ring 2, and a plurality of rolling elements 3 rollably arranged between a raceway surface 1a of inner ring 1 and a raceway surface 2a of outer ring 2. A lubricant film consisting of a solid lubricant is coated over an area equivalent to an area ratio of 75% or more of at least one member of the group consisting of raceway surface 1a of inner ring 1, raceway surface 2a of outer ring 2, and a rolling contact surface 3a of rolling element 3. The thickness of the lubricant film is preferably 0.05 ?m or more and 8 ?m or less.

Abstract: A linear motion device for receiving a load through a plurality of rolling elements sandwiched between a first and a second rolling-element rolling groove, wherein oil reservoirs constituted by numerous infinitesimal recesses each having a substantially circular arc-shaped section and having a surface roughness of 0.02 to 0.2 ?m Ra are formed in the surface of at least one of each of the rolling elements, the first rolling-element rolling groove, and the second rolling-element rolling groove.