Machines for grinding and bevelling opthalmic lenses

Details Machines for grinding and bevelling opthalmic lenses Machines for grinding and bevelling opthalmic lenses

1992-10-15

1994-06-21

Lavinder, Jack

Abrasive tool making process, material, or composition

With carbohydrate or reaction product thereof

51101LG, 51284E, 5116571, 5116575, B24B 1704

Patent

active

053219155

ABSTRACT:
Machine for grinding and bevelling ophthalmic lenses of the type comprising a carriage movable in translation and in oscillation in directions parallel to and perpendicular to a shaft carrying grinding wheels for edge trimming (4) and bevelling, and a follower (7) for measuring the distance between the plane tangent to the pole of the convex surface of the lens and the edge of the surface and for measuring the value which corresponds to the width of the edge surface (12) of the lens (3). The follower (7) has a surface (8) having a convex curvature identical to that of the grinding wheel and which comprises a matrix of detection elements which cooperate with the edge surface (12) of the lens. Each of the detection elements is connected to a corresponding portion of a sensor (14) to which it transmits a signal representing the passage of a part of the edge surface (12) of the lens in front of the corresponding detection element.

REFERENCES:
patent: 4233784 (1980-11-01), Loreto
patent: 4596091 (1986-06-01), Daboudet
patent: 4829715 (1989-05-01), Langlois

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