Abstract: A machine tool has a table body and a drive line on a bed. The table body is linearly movable via a guide member having a sliding or rolling guide surface. The drive line has a ball screw or the like, and moves the table body along the guide surface. A pair of guide members are provided at positions in point symmetry about the position of the center of gravity of the table body. Moreover, a pair of drive lines having the ball screws or the like are provided at positions in point symmetry about the position of the center of gravity of the table body. Alternatively, drive line having the ball screw or the like is provided at the position of the center of gravity of the table body.

Abstract: A machine tool has a table body and a drive line on a bed. The table body is linearly movable via a guide member having a sliding or rolling guide surface. The drive line has a ball screw or the like, and moves the table body along the guide surface. A pair of the guide members are provided at positions in point symmetry about the position of the center of gravity of the table body. Moreover, a pair of the drive lines having the ball screws or the like are provided at positions in point symmetry about the position of the center of gravity of the table body. Alternatively, the drive line having the ball screw or the like is provided at the position of the center of gravity of the table body. The machine tool can effectively suppress vibrations of a structure (such as the bed) generated during movement of a moving object (such as the table body) relative to the structure by the drive line, thereby shortening the machining time and increasing productivity.

Abstract: A machine tool has a spindle head and ball screws on a saddle. The spindle head is provided via sliding or rolling guide members so as to be linearly movable. The ball screws move the spindle head along the guide members. Concave sliding or rolling guide portions parallel to the guide members are provided on both sides of the guide members. Counterweights linearly movable on the concave guide portions in a direction opposite to the spindle head are provided. Racks are provided on opposed surfaces of the counterweights and the spindle head along the directions of movement of the spindle head and the counterweights. Pinions meshing with the racks are rotatably supported in the saddle. The machine tool can effectively suppress vibrations of a structure (such as the saddle) generated during movement of a moving object (such as the spindle head) relative to the structure by a drive line (such as the ball screws), and always keep the center of gravity of an entire relatively moving portion constant.

Abstract: A milking machine, which fastens teat cup liners R to teats B of a cow and repeats vacuum suction and quiescence for milking the cow, includes 1/f fluctuation signal generation module unit 2 for generating a 1/f fluctuation signal Ss based on the biorhythm of the cow and a control unit 3 for changing the control amount during milking, for instance, the number of pulses per unit time of a pulse control signal Sc for switching the suction and the quiescence, the duty ratio of the pulse control signal Sc, or the magnitude of the negative pressure corresponding to the 1/f fluctuation signal Ss.