Apparatus for measuring the shape of a frame of spectacles

Details Apparatus for measuring the shape of a frame of spectacles Apparatus for measuring the shape of a frame of spectacles

1995-11-03

1997-04-01

Fulton, Christopher W.

Geometrical instruments

Gauge

Spectacle

33507, 33 28, G01B 728

Patent

active

056154860

ABSTRACT:
An apparatus for measuring the shape of a frame of spectacles is provided wherein the shape of a frame is measured with a measuring element which is held in contact with a groove in a rim of the frame while being moved along the groove. To accurately position the measuring element with respect to the groove of the frame before the start of measurement, positioning means is provided which moves the measuring element horizontally toward the frame, presses the measuring element against the frame with a biasing force, and which positions the measuring element at a measurement position. Further, to permit smooth vertical movement of the measuring element and to achieve accurate shape measurement, thrust means is provided which pushes the lower end face of a measuring element supporting shaft upward at a location displaced from the axis of the shaft. To accurately position the measuring element for accurate shape measurement, the measuring element supporting shaft has a projection located between the measuring element and intervening means. Further, to reliably hold the frame with ease and to prevent deformation of the same, a turning mechanism is provided for turning at least one of two holding members parallel to the plane of the frame rim, the holding members contacting the upper and lower portions, respectively, of the frame to thereby hold the frame.

REFERENCES:
patent: 4051601 (1977-10-01), Godot
patent: 4724617 (1988-02-01), Logan et al.
patent: 4991305 (1991-02-01), Saigo et al.
patent: 4995170 (1991-02-01), Brule et al.

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