Annular oven on a turning base for one of the faces of a form for optical lenses to conform by thermal treatment and application of a vacuum

摘要

the invention relates to a continuous furnace (1) with a profile to a side of the optical lens blanks by the thermal subsidence of these drafts on templates (15) shaped as well the concomitant action of a vacuum, which includes:a fixed frame (7).an annular rotary hearth (3) composed of a plurality of successive sections, each section being provided with a plurality of supports, in the form of tulips (14) for supporting the templates (15).a tunnel set comprising at least one heating zone at a temperature causing the softening; and at least one cooling zone sketches based on one of their sides.- training in rotation of the sole (29).a vacuum source driven in rotation with the sole (22).- ways and means (24, 26, 27, 28) for connecting to a tulipu00e9s materials section of the sole to the vacuum source, where the section is a first predetermined position of the heating zone, and connecting the material to the ambient air when the tulipu00e9s section in a second predetermined position of the heating zone.;used by manufacturers of progressive lenses.