Work positioning method and apparatus
AssigneeNissan Motor Co., Ltd.
InventorsMinoru Nomaru, Tatsuo Naitoh
Life of this patent
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Abstract
A method and apparatus for positioning a plurality of works combined to assemble an article. Values of positions of a plurality of reference points set on each of the works are measured. The measured position values are accumulated to provide measured position data defining a measured position of the work. The measured position data are compared with design data defining a position specified for the work to provide error data defining a difference between the measured and specified positions for the work. The error data are used to position the work with respect to the other works.
Claims10
An apparatus for positioning a plurality of works for combining to assemble an article, the apparatus comprising:
- means for measuring values of positions of a plurality of reference points set on each of the works;
- means for storing the measured position values to provide measured position data defining a measured position of each of the works;
- means for providing design data defining a position specified for each of the works;
- means for comparing the measured position data with the design data to provide error data defining a difference between the measure and specified positions for each of the works;
- means for reading, from the error data provided for a first one of the works, a first difference between the measured and specified positions for the first work;
- means for reading, from the error data provided for a second one of the works, a second difference between the measured and specified positions for the second work, the second work being to be jointed to the first work;
- means for calculating a correction factor equal to a sum of the first and second differences when both of the first and second differences have the same sign and a correction factor equal to a difference between the first and second differences when the first and second differences have different signs;
- and
- means for positioning the first and second works based on the calculated correction factor.
A method of positioning a plurality of works combined to assemble an article, the method comprising the steps of:
- measuring values of positions of a plurality of reference points set on each of the works;
- storing the measured position values to provide measured position data defining a measured position of each of the works;
- providing design data defining a position specified for each of the works;
- comparing the measured position data with the design data to provide error data defining a difference between the measure and specified positions for each of the works;
- reading, from the error data provided for a first one of the works, a first difference between the measured and specified positions for the first work;
- reading, from the error data provided for a second one of the works, a second difference between the measured and specified positions for the second work, the second work being to be jointed to the first work;
- calculating a correction factor equal to a sum of the first and second differences when both of the first and second differences have the same sign and a correction factor equal to a difference between the first and second differences when the first and second differences have different signs;
- and
- positioning the first and second works based on the calculated correction factor.
Dependencies are inferred from the claim text.