Apparatus for tracing the lens opening in an eyeglass frame

Details Apparatus for tracing the lens opening in an eyeglass frame Apparatus for tracing the lens opening in an eyeglass frame

1986-08-14

1988-02-16

Martin, Jr., William D.

Geometrical instruments

Scriber

Curved line

33503, 33513, G01C 2500

Patent

active

047246170

ABSTRACT:
Apparatus for tracing the inner periphery of an eyeglass frame lens opening and for producing a set of coordinates each of which coordinate set describes a sensed position along the traced path. The eyeglass frame is positioned on an overhead bridge and a stylus held by a stylus holding fixture engages the eyewire groove of the lens opening and is used as a guide to move the fixture along the traced path. Encoding arms are coupled to the fixture and drive respective associated rotary encoders whose outputs represent the distance each arm has moved from a first to a second sensed location along the path. A computer operates in accordance with an instruction set to generate coordinates for each of the sensed points along the traced path whereby the set of coordinates characterizes the size and shape of the lens opening.

REFERENCES:
patent: 2878567 (1959-03-01), Hofman et al.
patent: 4437151 (1984-03-01), Hurt et al.

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