Device and method for measuring object to be measured having hollow circular cylindrical shape, and device for inspecting external appearance of tire

Abstract

A measuring device for automatically measuring the height of a hollow circular object, the dimensions of inner and outer surfaces of the object, and the shape of the object. The measuring device is constructed from a measuring head (2) vertically moving along a positioning guide (1b) supported by a strut (1c) integral with a measuring table (1), a device (6) for measuring displacement in height, the device (6) having a laser distance meter (6a) provided to the measuring table (1), an inner surface measuring device (3) having a calculation processing device, starting measurement when the measuring head (2) is raised by a weight (5) from a measurement start point of the measuring table (1), and provided with three laser distance meters (3a, 3b, 3c) mounted to the measuring head (2), and an outer surface measuring device (4) having a laser distance meter (4a). The inner and outer surfaces of a tire (T) are measured based on the result of displacement measurement by the measuring head (2)of the device (6) for measuring displacement in height, and specific dimensions are obtained by processing measured values by using the calculation processing device.

Description

technical field [0001] The present invention relates to measurement of the size and shape of a cylindrical object to be measured, for example, an apparatus and method for automatically measuring and calculating the size and shape of a tire. Background technique [0002] Conventionally, when measuring the size of a tire, the size of each part of the tire was manually measured using a scale, a triangle, a tape measure, or the like. In addition, as a means of measuring the size of the tire, there is a method proposed in Patent Document 1, that is, image processing is performed with a CCD camera, and a plurality of patterns stored in the recognition device in advance are compared with a predetermined pattern obtained by image processing to recognize Tires to measure the tire size. [0003] Patent Document 1: Japanese Patent Application Laid-Open No. 7-39827 [0004] However, when measuring manually with a measuring device such as a scale, not only the reading error of the meas...

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Problems solved by technology

[0004] However, when measuring manually with a measuring device such as a scale, not only the reading error of the measuring device, the positioning error of the measuring position where the measuring device is close to the object to be measured, and other measurement deviations cannot be avoided, but also the working time for the measurement is relatively long. long

And because the measurement is carried out in a contact manner, there is a problem that the tire is deformed during the measurement of the tire and cannot be measured accurately.

In addition, since the measured dimensions have to be separately input to the recording medium, forgetting to input, input errors, etc. may occur.

[0005] In addition, according to the method of Patent Document 1, human errors can be avoided, but if the tire size, pattern, etc. are not input into the recognition device in advance, the tire size information cannot be easily obtained.

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