Automatic machine for grinding and bevelling ophthalmic glasses

Details Automatic machine for grinding and bevelling ophthalmic glasses Automatic machine for grinding and bevelling ophthalmic glasses

1993-10-14

1994-12-13

Rachuba, Maurina T.

Abrading

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

Computer controlled

451240, 451 9, B24B 4900

Patent

active

053719743

ABSTRACT:
The invention provides a machine for grinding and bevelling ophthalmic glasses of the type comprising a carriage (1) mounted to be movable in translation and in oscillation in a direction parallel with and perpendicular to a shaft (5) carrying at least one grinding wheel (4, 4A), and means for measuring the distance (L1) between the plane (PO) tangent to the pole (0) of the convex face of the glass (3) and the edge of the convex face, characterized in that the measuring means comprise means defining a reference surface (S) which is connected to move axially in translation with the grinding wheel, extends in a radial plane perpendicular to the axis of rotation of the grinding wheel and with which at least one point of the edge (A) of the convex face of the glass (3) is brought into contact by a movement in translation of the carriage (1), a sensor (18) for measuring the movements in translation of the carriage (1) relative to the grinding wheel (4) and means (12) for analyzing and processing signals from the sensor (18) for detecting the contact of the edge of the glass (3) with the reference surface (S) and deducing therefrom the distance (L1).

REFERENCES:
patent: 4300317 (1981-11-01), Croft et al.
patent: 4596091 (1986-06-01), Daboudet et al.
patent: 4829715 (1989-05-01), Langlois et al.
patent: 4964239 (1990-10-01), Gottschald et al.
patent: 5161333 (1992-11-01), Lecerf et al.
patent: 5321915 (1994-06-01), Lecerf et al.

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