Title:
車両車輪用のタイヤをチェックするための方法および装置
Document Type and Number:
Japanese Patent JP6656375
Kind Code:
B2
Abstract:
Method and apparatus for checking tires for vehicle wheels. A tire to be checked is fed to a checking station. A sidewall of the tire lies on a supporting portion of a rotating table. The supporting portion lies on a plane while the rotating table has a rotation axis perpendicular to the plane. A centring operation is carried out to align, in the plane, the rotation axis of the tire with the rotation axis of the rotating table. The centring operation includes identification, in the plane, of the rotation axis of the tire by: a) acquisition of an image of the tire laid on the supporting portion of the rotating table; b) definition, in the acquired image, of a number of analysis directions intersecting at one selected central point; c) for each analysis direction: c1) definition, in the acquired image, of a number of potential axes of symmetry, perpendicular to the analysis direction; c2) calculation of a level of symmetry of the image with respect to each potential axis of symmetry, where the level of symmetry is indicative of the probability that the center of the tire is on the respective potential axis of symmetry; c3) determination of a probability distribution indicative of a variation of the level of symmetry along the analysis direction; d) determination of a center of the tire on the basis of a cumulative probability distribution obtained through a combination of the probability distributions calculated for the analysis directions; e) identification of the rotation axis of the tire in an axis that passes through the determined center and perpendicular to the plane.
Inventors:
Boffa, Vincenzo
Luca, Tersi
Vallardini, Valeriano
Luca, Tersi
Vallardini, Valeriano
Application Number:
JP2018526529A
Publication Date:
March 04, 2020
Filing Date:
November 29, 2016
Export Citation:
Assignee:
Pirelli, Tire, Sochieta, Per, Azioni
International Classes:
G01M17/02; B60C19/00; G01B11/00
Domestic Patent References:
| JP2011247646A | ||||
| JP2015004680A |
Foreign References:
| WO2012157716A1 | ||||
| WO2015064369A1 | ||||
| WO2016174543A1 |
Attorney, Agent or Firm:
Yoshiyuki Inaba
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito
Toshifumi Onuki
Akihiko Eguchi
Kazuhiko Naito