Abstract: The cutting-edge position detecting method includes the steps of: under a condition in which the cutting edge of the tool is positioned in an image that is taken by a camera, performing first sampling scanning operations for the image in a predetermined scanning direction at predetermined first intervals, and recognizing points on an upper edge line of the cutting edge of the tool and points on a lower edge line thereof, based on brightness changing points upon the first scanning operations; connecting the recognized points on the respective two edge lines, so as to obtain two first-level approximate linear lines by a least-squares method; performing second sampling scanning operations for the respective two first-level approximate linear lines in directions perpendicular thereto at predetermined second intervals, and newly recognizing points on the upper edge line of the cutting edge of the tool and points on the lower edge line thereof, based on brightness changing points upon the second scanning operations

Abstract: In an apparatus for measuring shapes of both sides of a plate, a measuring apparatus body includes a reference plane of a longitudinal surface plate disposed in an almost vertical state at one end on a metallic bed, a holding mechanism for holding a plate to be measured in almost parallel therewith, and a displacement gauge scanning column. The displacement gauge scanning column includes a first air slide for mounting a first (second) displacement gauge and a second air slide for mounting a third displacement gauge, and is moved in a horizontal axis direction along a pair of V grooves. Moreover, the first (second) air slide is moved in a vertical axis direction. A shape of one of plate surfaces of the plate to be measured is measured by the scan of the first (second) displacement gauge, and at the same time, a shape of the other surface of the plate surface is measured by the scan of the third displacement gauge.

Abstract: There is provided a V-groove machining method and apparatus which, by measuring the depth of a V groove cut by a cutting tool and correcting the cutting depth of the cutting tool based on the measurement data, enables high precision machining of four-sided pyramids having vertices of a uniform height.

Abstract: There is provided a precision roll turning lathe which can perform machining of fine grooves at a dramatically higher speed as compared to conventional roll turning lathes, thus significantly shortening time taken for machining one groove.

Abstract: There is provided a roll surface machining method which makes it possible to machine a roll with a reduced amount of data. The roll surface machining method for forming a three-dimensional pattern of protrusions or recesses in the surface of a roll by using a cutting tool, the method including the steps of: setting a machining start position of the cutting tool with respect to the surface of the roll by C-axis indexing of the roll and positioning of the roll in the axial direction (Z-axis direction) both with respect to the cutting tool; and rotating the roll at a predetermined speed and moving the cutting toot and the roll relative to each other at a predetermined speed in the axial direction of the roll by C-Z axis interpolation, thereby forming the three-dimensional pattern in the surface of the roll.

Abstract: There is provided a roll machining apparatus which can accurately support a roll by means of hydrostatic bearings while absorbing thermal expansion of the roll in the length direction e.g. due to a change in room temperature, thus enhancing the machining precision.

Abstract: There is provided an apparatus for preventing displacement of a retainer in a rolling guide by making use of the property of the retainer of moving half the distance of a moving object, such as a table.

Abstract: There is provided a precision roll turning lathe which can machine with high precision a three-dimensional pattern of three-sided pyramids or four-sided pyramids in the surface of a roll.

Abstract: The present invention provides a precision roll turning lathe which can form a pattern including three-dimensionally shaped portions, such as three-sided pyramids, on the surface of a roll, with high accuracy. Specifically, a tool post 33 is provided with a tool turning axis (A axis) which is used to turn a tool such that, when forming a spiral groove cut through the roll, a cutting face of a tip of the tool 36 is oriented to be perpendicular to the direction along which the spiral groove extends.

Abstract: There is provided a precision roll turning lathe which can not only machine with high precision circumferential transverse grooves in the peripheral surface of a roll but can also machine with high precision longitudinal grooves in the peripheral surface.

Abstract: In an apparatus for measuring shapes of both sides of a plate, a measuring apparatus body includes a reference plane of a longitudinal surface plate disposed in an almost vertical state at one end on a metallic bed, a holding mechanism for holding a plate to be measured in almost parallel therewith, and a displacement gauge scanning column. The displacement gauge scanning column includes a first air slide for mounting a first (second) displacement gauge and a second air slide for mounting a third displacement gauge, and is moved in a horizontal axis direction along a pair of V grooves. Moreover, the first (second) air slide is moved in a vertical axis direction. A shape of one of plate surfaces of the plate to be measured is measured by the scan of the first (second) displacement gauge, and at the same time, a shape of the other surface of the plate surface is measured by the scan of the third displacement gauge.