Method and device for treating spectacle glasses by means of a CNC-controlled spectacle glass treatment machine
A process of machining spectacle lenses using of a CNC spectacle lens-machining machine is provided. The process includes positioning the rough-cast lens on a holder in the spectacle lens-machining machine, machining an optical surface and/or the edge of the rough-cast lens in accordance with predetermined optical and/or shape-related values, continuously or cyclically checking the position of the rough-cast lens on the holder during machining using a sensor, and continuously or cyclically incorporating any recorded displacement of the rough-cast lens on the holder in the spectacle lens-machining values.
1. A process to machine spectacle lenses using a spectacle lens-machining machine, the process comprising the steps of:
positioning a rough-cast lens on a holder of the spectacle lens-machining machine, the rough-cast lens having an optical surface and an edge;
machining at least one of the optical surface and the edge of the rough-cast lens in accordance with spectacle lens-machining values stored in a control device, the machining including a machining process selected from the group consisting of edge machining, grinding, prismatic machining, prismatic cutting, peripheral edge grinding, and polishing, the spectacle lens-machining values being determined in accordance with at least one of predetermined optical values and shape-related values of the rough-cast lens;
checking a position of the rough-cast lens on the holder during the machining of the rough-cast lens to determine whether the rough-cast lens displaces on the holder, the checking being performed using a sensor;
determining a displacement value of the rough-cast lens if the checking step determines that the rough-cast lens displaces on the holder; and
updating the spectacle lens-machining values stored in the control device in accordance with the displacement value of the rough-cast lens during the machining of the rough-cast lens.
2. The process of claim 1 , further comprising the steps of:
comparing the displacement value of the rough-cast lens to a maximum permissible displacement value; and
interrupting the machining of the rough-cast lens if the displacement value of the rough-cast lens exceeds the maximum permissible displacement value.
3. The process of claim 1 , further comprising the step of:
reducing at least one of a machining force and a machining speed if the displacement value of the rough-cast lens is detected when the position of the rough-cast lens on the holder is checked.
4. The process of claim 1 , wherein the rough-cast lens has an optical center and an axis of rotation, the process further comprising the steps of:
determining a position of the optical center with respect to the axis of rotation of the rough-cast lens; and
updating the spectacle lens-machining values in accordance with the determined position.
5. The process of claim 4 , wherein the rough-cast lens is a continuous vision lens having a progression channel and at least one of a cylindrical and prismatic cut, the process further comprising the steps of:
determining an angular position of the progression channel and at least one of the cylindrical and prismatic cut with respect to the axis of rotation of the rough-cast lens; and
updating the spectacle lens-machining values in accordance with the determined angular position.
6. The process of claim 1 , wherein the holder is annular and includes a hollow spectacle lens-holding shaft, a measurement shaft being arranged within the hollow spectacle lens-holding shaft coaxially with the axis of rotation of the rough-cast lens, the measurement shaft having at least one of a vacuum arrangement and an adhesive to position the rough-cast lens on the holder, the process further comprising the steps of:
measuring an angular position of the measurement shaft; and
updating the spectacle lens-machining values in accordance with the measured angular position of the measurement shaft.
7. The process of claim 6 , wherein the angular position of the measurement shaft is measured using the sensor.
8. The process of claim 6 , wherein the angular position of the measurement shaft is measured using a second sensor.
9. The process of claim 1 , wherein the checking and updating steps are performed continuously.
10. The process of claim 1 , wherein the checking and updating steps are performed cyclically.
11. The process of claim 1 , further comprising the step of:
applying a grinding force to the rough-cast lens to grind the rough-cast lens.
12. The process of claim 1 , further comprising the step of:
adjusting a holding force applied to the rough-cast lens while machining the rough-cast lens.