Process for measuring forward and rearward three-dimensional cur

Details Process for measuring forward and rearward three-dimensional cur Process for measuring forward and rearward three-dimensional cur

1995-02-14

1996-07-23

Lavinder, Jack W.

Abrading

Precision device or process - or with condition responsive...

With feeding of tool or work holder

451 43, 451240, 451255, 451256, B24B 1700, B24B 914

Patent

active

055384595

ABSTRACT:
A process for measuring forward and rearward three-dimensional curves and the thickness at the circumference of a contour-ground eyeglass lens by means of a computer-controlled eyeglass lens edge grinding machine. As the corrective lens is being ground, the rotation of the corrective lens is interrupted when a measurement point is reached, and the corrective lens is shifted axially relative to the grinding disk away from the center section and toward the edges of the grinding disk until the forward and rearward edges at the circumference of the corrective lens touch the tracing device. The path or the time consumed in moving from the center section to the point of contact with the tracing device is recorded, and the measured values are stored in the computer, the shaft halves holding the corrective lens rotate further, until the next measurement point is reached, when a measurement is again taken. The process is continued until the shaft halves holding the corrective lens have completed at least one full revolution. This type of measurement value acquisition avoids errors due to very severe concavity in very thick lenses.

REFERENCES:
patent: 4596091 (1986-06-01), Dabou et al.
patent: 4638601 (1987-01-01), Steere et al.
patent: 4964239 (1990-10-01), Gottschald et al.
patent: 5321915 (1994-06-01), Lecerf et al.

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