Automatic machine for shaping the external profile of spectacle lenses
First Claim
1. Automatic machine for shaping the external profile of spectacle lenses, comprising:
- at least three cutters operated simultaneously by drive means turning at constant speed;
a lens carriage that is traversed through an axis parallel to that about which the cutters rotate, mounted so as to pivot about an axis located to the rear of and parallel with the cutter axis, and provided with means by which a pattern lens and the lens to be shaped may be rotated about their own axes at one and the same time;
a cutter selection device which traverses the lens carriage into a position whereby the lens is offered to the requisite cutter;
a positioning device which adjusts lens carriage traverse for the purpose of selecting the distance that separates the bevel from the outer edge of the lens;
a cam mechanism which modifies carriage traverse in such a way as to ensure that the bevel follows the the curvature of the lens and remains located at the prescribed distance from its outer edge;
means by which to produce rotation of the carriage about the axis to which it is pivotably mounted;
a cam control for scaling the diameter of the cut lens up or down in relation to that of the pattern;
a programmer designed to implement the requisite number of cutting steps and rate of feed suitable for the type of material from which the lenses are fashioned.
1 Assignment
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Accused Products
Abstract
The invention relates to an automatic machine for shaping spectacle lenses, especially those in shatterproof material, with a bevel that serves to hold the lens in the frame. Lenses are copied from a pattern by three cutters which correspond to the three types of conventional bevel in current use; a positioning device stations the lens opposite the cutter giving the requisite bevel. Further devices adjust the position of the bevel in relation to the outer edge of the lens, and ensure that it follows the curvature of the individual lens while remaining at the right distance from the edge. The machine is a copier, and as such, utilizes a tracing mechanism for reproduction from the pattern lens; cam control is adopted for scaling the size of the copied lens up or down in relation to the pattern.
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Citations
10 Claims
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1. Automatic machine for shaping the external profile of spectacle lenses, comprising:
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at least three cutters operated simultaneously by drive means turning at constant speed; a lens carriage that is traversed through an axis parallel to that about which the cutters rotate, mounted so as to pivot about an axis located to the rear of and parallel with the cutter axis, and provided with means by which a pattern lens and the lens to be shaped may be rotated about their own axes at one and the same time; a cutter selection device which traverses the lens carriage into a position whereby the lens is offered to the requisite cutter; a positioning device which adjusts lens carriage traverse for the purpose of selecting the distance that separates the bevel from the outer edge of the lens; a cam mechanism which modifies carriage traverse in such a way as to ensure that the bevel follows the the curvature of the lens and remains located at the prescribed distance from its outer edge; means by which to produce rotation of the carriage about the axis to which it is pivotably mounted; a cam control for scaling the diameter of the cut lens up or down in relation to that of the pattern; a programmer designed to implement the requisite number of cutting steps and rate of feed suitable for the type of material from which the lenses are fashioned. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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Specification