Kabushiki Kaisha Bridgestone

Bridgestone Corporation

Norihiro Honda

Tomoyuki Kaneko

A measuring apparatus for automatically measuring the height, the dimensions of the inner and outer surfaces, and the shape of a cylindrically-shaped object. The measuring apparatus includes a measuring head vertically moving along a positioning guide supported by a support post integral with a measuring table, a height displacement measuring device, which comprises a laser distance meter provided on the measuring table, and an arithmetic processing unit. The measurement starts as the measuring head is raised by a weight from a measuring start position of the measuring table. The inner and outer surfaces of a tire are measured based on the measurements by an inner surface measuring device provided with three laser distance meters mounted to the measuring head and an outer surface measuring device having a laser distance meter and the displacement change measurement of the measuring head by the height displacement measuring device. Required dimensional values are calculated from the measured values, using the arithmetic processing unit.

Apparatus and method for measuring cylindrically-shaped object and apparatus for inspecting tire appearance

An image of respective figures is cut out by selecting a figure from tire CAD drawings, and an arranging position of the figure is set in accordance with a distance in a radial direction form a tire center and a deformed angle in a circumferential direction of the tire from a designated location, so that a height of respective regions of the cut-out image is set. Then, the cut-out image is transformed into an image having a gray scale in accordance with the height by using the height information of respective regions, and, at an arranging position of the figure, the image having a gray scale is sampled by a predetermined interval in a radial direction from a tire center and is sampled by a predetermined angle interval in a circumferential direction of the tire, so that master data are created by the image and a distance between intersecting points becomes equal.

Method of creating master data used for inspecting concave-convex figure

Providing a method for correcting a data of irregularity of a surface of a body of rotation with an eccentricity included to a data being not affected by eccentricity. The distance data Lbetween the tire crown portionof the tireto be inspected and the distance sensor is measured at each of measurement points Xat every angular displacement &#x394;&#x3b8; in a circumferential direction of the tire and also radius value rare computed from the above distance data Land the distance Lbetween the center of rotation of the tire and the distance sensor; and further the surface length Sis computed by integrating the radius value rwith respect to &#x394;&#x3b8; from the measurement starting point to a current measurement point k and the irregularity data is converted into the form of (X, r) and then the radius values Rat the irregularity computing points Xdividing the one round surface length Sof the tire into equal intervals are computed based on the radius values rand r+1 at the measurement points Xand X+1 adjacent to the irregularity computing point X, serving as an irregularity data (X, R) at respective points dividing the surface of the tire crown portion into equal intervals circumferentially the tire.

Growing community of inventors

Kodaira, Japan

Norihiro Honda