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Preformed block piece having a holding surface with an axis that is offset relative to the axis of rotation of the block piece

a technology of holding surface and block piece, applied in the field of block piece, can solve the problems of cost-intensive and detrimental use of alloy, and achieve the effects of free machining, no further reblocking expense, and favorable deblocking operation

Inactive Publication Date: 2013-09-05
SCHNEIDER GMBH & CO KG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This approach reduces adhesive usage, minimizes machining complexity, and allows for faster production with reduced heat input, enabling precise orientation and support of lenses with varying shapes, including those with unknown surface forms, while ensuring efficient deblocking without damaging the lens.

Problems solved by technology

Using the alloy is cost-intensive and detrimental in terms of the time course of the process, since a relatively large amount of alloy is needed.

Method used

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  • Preformed block piece having a holding surface with an axis that is offset relative to the axis of rotation of the block piece
  • Preformed block piece having a holding surface with an axis that is offset relative to the axis of rotation of the block piece
  • Preformed block piece having a holding surface with an axis that is offset relative to the axis of rotation of the block piece

Examples

Experimental program
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Embodiment Construction

[0053]A block piece 1 shown in FIG. 1 has a coupling part 1.1 for holding and orienting in a workpiece chuck 3 or block piece chuck per FIG. 2, as well as a holding part 1.3 with a holding surface 1.4 for a lens 2 configured as a spectacles glass per FIG. 4. The holding part 1.3 has so large a diameter that every spectacles glass being fabricated can be brought to bear against the holding surface 1.4 with the entire surface of a second side 2.2. At the center of the holding surface 1.4, the block piece 1 has the mouth of a pressurizing agent channel 1.6, by which pressurizing agent can be taken from an outer surface 1.7 into the region of the holding surface 1.4. The workpiece chuck 3 per FIG. 2 has several recesses 3.1 for detent screws, distributed about the circumference, in order to attach the flange of a tool spindle, not shown.

[0054]The coupling part 1.1 has, besides a conical or cylindrical support surface of a particular diameter, also a bearing surface at its end, working i...

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Abstract

A block piece for holding an optical lens to be machined, with a coupling part for being held in a workpiece chuck and with a holding part for fastening the lens. The holding part has a convex or concave holding surface corresponding to a first side of the lens. The holding surface is, according to the shape of the lens to be held, provided in the form of a negative free-forming surface, and the block piece is made from a plastic that can be machined. The principal axis of the holding surface is arranged set off and / or tilted relative to the axis of rotation of the coupling part

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]This application is a continuation-in-part of co-pending U.S. patent application Ser. No. 11 / 795,729.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to a block piece for the holding of an optical lens being machined with a coupling part, having an axis of rotation, for the holding and orienting in a workpiece chuck, and a holding part for the securing of the lens, wherein the holding part has a convex or concave holding surface corresponding to a first side of the lens. A holding surface is thus considered to be convex or concave if it is raised relative to the ground, i.e., bulging outward, or sunken, arching inward, regardless of whether it is configured as spherical or aspherical.[0004]2. Description of Related Art[0005]A method for cutting of a contact lens out of a cylindrical blank is already familiar from European Patent EP 1 112 143 B1 and corresponding U.S Pat. Nos. 6,786,802 and 6,315,650. He...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B23Q3/10
CPCB24B9/146B24B13/0057Y10T156/1064B23Q3/105B32B38/10
Inventor SCHNEIDER, GUNTERBUCHENAUER, HELWIGBOERNER, ULFKRAEMER, KLAUS
Owner SCHNEIDER GMBH & CO KG