Simultaneous turning device for fabrication of eyeglass lenses

1. A fabrication mechanism ( 1 ) for manufacturing of eyeglass lenses from lens blanks ( 100 a , 100 b , 100 c , 100 d , 100 e ), with a milling device ( 10 ) and with a turning device ( 50 ),

wherein the milling device ( 10 ) has at least one milling station ( 11 ) with a work piece holder ( 12 ) to hold a lens blank ( 100 a , 100 b , 100 c , 100 d , 100 e ) and a milling tool ( 13 ) for machining the lens blank ( 100 a , 100 b , 100 c , 100 d , 100 e ), and

wherein the turning device ( 50 ) has a first turning station ( 51 a ) with a rotatable first work piece spindle ( 52 a ) to hold a lens blank ( 100 a , 100 b , 100 c , 100 d , 100 e ) and a first turning tool ( 53 a ) for machining of a lens blank ( 100 a , 100 b , 100 c , 100 d , 100 e ),

wherein the turning device 50 has at least one second turning station ( 51 b ) with a rotatable second work piece spindle ( 52 b ) to hold a second lens blank ( 100 a , 100 b , 100 c , 100 d , 100 e ) and a second turning tool ( 53 b ) for the machining of a second lens blank ( 100 a , 100 b , 100 c , 100 d , 100 e ); wherein a loader ( 30 ) is provided, which is configured to remove lens blanks ( 100 a , 100 b , 100 c , 100 d , 100 e ) from the milling device ( 10 ) and load them into the rotatable first and second work piece spindles ( 52 a , 52 b ) and further wherein the turning device ( 50 ) is provided with the loader ( 30 ), being further configured to load lens blanks ( 100 a , 100 b , 100 c , 100 d , 100 e ) into the rotatable first and second work piece spindles ( 52 a , 52 b ).

2. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the loader ( 30 ) has a pair of holding means ( 34 ) for each turning station ( 51 a , 51 b 52 a , 52 b ) to hold two lens blanks ( 100 a , 100 b , 100 c , 100 d , 100 e ), the holding means ( 34 ) of the pairs being oriented at an angle to each other and interconnected, and the pairs of holding means ( 34 ) being able to rotate about a common turning axis.

3. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the work piece spindles ( 52 a , 52 b ) of the turning device ( 50 ) have parallel oriented spindle axes (A 1 , A 2 ).

4. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the work piece spindles ( 52 a , 52 b ) of the turning device ( 50 ) are arranged in a common spindle plane (E 1 ).

5. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the turning stations ( 51 a , 51 b ) have a common transverse drive ( 73 ) with which a spacing (X 1 ) of the turning tools ( 53 a , 53 b ) relative to the spindle axis (A 1 , A 2 ) of a coordinated work piece spindle ( 52 a , 52 b ) can be changed.

6. The fabrication mechanism ( 1 ) according to claim 5 , characterized in that turning stations ( 51 a , 51 b ) have a common linear drive ( 74 ) with which a spacing (X 2 ) of the turning tools ( 53 a , 53 b ) relative to a coordinated work piece spindle ( 52 a , 52 b ) can be changed and each turning tool ( 53 a , 53 b ) has its own tool servomotor ( 75 a , 75 b ), by which an infeed depth (T) can be changed with respect to a coordinated work piece spindle ( 52 a , 52 b ) and the turning device ( 50 ) has a control electronics ( 54 ) to put out drive signals (S 1 a , S 1 b , S 2 , S 3 , S 4 a , S 4 b ) to the work piece spindles ( 52 a , 52 b ), the common transverse drive ( 73 ), the common linear drive ( 74 ) and the tool servomotors ( 75 a , 75 b ), wherein the drive signals (S 1 a , S 1 b , S 2 , S 3 , S 4 a , S 4 b ) of the control electronics ( 54 ) are matched up with each other.

7. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the turning stations ( 51 a , 51 b ) have a common linear drive ( 74 ) with which a spacing (X 2 ) of the turning tools ( 53 a , 53 b ) relative to a coordinated work piece spindle ( 52 a , 52 b ) can be changed.

8. The fabrication mechanism ( 1 ) according to claim 7 , characterized in that each turning tool ( 53 a , 53 b ) has its own tool servomotor ( 75 a , 75 b ), by which an infeed depth (T) can be changed with respect to a coordinated work piece spindle ( 52 a , 52 b ) and the common linear drive ( 74 ) has a maximum first travel and the tool servomotors ( 75 a , 75 b ) a maximum second travel, while the maximum first travel corresponds to at least 10 times the maximum second travel.

9. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that each turning tool ( 53 a , 53 b ) has its own tool servomotor ( 75 a , 75 b ), by which an infeed depth (T) can be changed with respect to a coordinated work piece spindle ( 52 a , 52 b ).

10. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the turning device ( 50 ) has 1.5 to 2.5 times as many turning stations ( 51 a , 51 b ) as the milling device ( 10 ) has milling stations ( 11 ).

11. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the milling device ( 10 ) has precisely one milling station ( 11 ) and the turning device ( 50 ) precisely two turning stations ( 51 a , 51 b ).

12. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the milling device ( 10 ) and the turning device ( 50 ) have a common machine frame and/or a common machine bed ( 70 ).

13. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the milling device ( 10 ) and the turning device ( 50 ) are vibration-decoupled.

14. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the milling device ( 10 ) and the turning device ( 50 ) are arranged in a common manufacturing cell ( 71 ).

15. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the milling device ( 10 ) and the turning device ( 50 ) are arranged in separate work spaces, while the work spaces are preferably separated from each other at least in regard to a transfer of machining chips.

16. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the loader ( 30 ) has transport means ( 31 ) for the transport of a lens blank ( 100 a , 100 b , 100 c , 100 d , 100 e ) from the milling station ( 11 ) to the turning stations ( 51 a , 51 b ).

17. The fabrication mechanism ( 1 ) according to claim 1 , characterized in that the loader ( 30 ) has a lens magazine ( 32 ) for at least one lens blank ( 100 a , 100 b , 100 c , 100 d , 100 e ).

18. A method for the operation of a fabrication mechanism ( 1 ) according to claim 1 , characterized by the following steps:

a) loading of a first lens blank ( 100 a ) into the work piece holder ( 12 ) and machining of the first lens blank ( 100 a ) with the milling tool ( 13 );

b) removal of the first lens blank ( 100 a ) from the work piece holder ( 12 ) with the loading device ( 30 );

c) subsequent loading of a second lens blank ( 100 b ) into the work piece holder ( 12 ) and machining of the second lens blank ( 100 b ) with the milling tool ( 13 );

d) subsequent removal of the second lens blank ( 100 b ) from the work piece holder ( 12 ) with the loading device ( 30 );

e) loading of the first and second lens blank ( 100 a , 100 b ) into the work piece spindles ( 52 a , 52 b ) with the loading device ( 30 ), and loading of a third lens blank ( 100 c ) into the work piece holder ( 12 );

f) simultaneous machining of the third lens blank ( 100 c ) with the milling tool ( 13 ) and of the first and second lens blank ( 100 a , 100 b ) with the turning tools ( 53 a , 53 b ).

19. The method according to claim 18 , characterized by the following steps:

g) removal of the third lens blank ( 100 c ) from the work piece holder ( 12 ) with the loading device ( 30 ) and loading of a fourth lens blank ( 100 d ) into the work piece holder ( 12 ) and machining of the fourth lens blank ( 100 d ) with the milling tool ( 13 ) during the machining of the first and the second lens blank ( 100 a , 100 b ) with the turning tools ( 53 a , 53 b ).

20. The method according to claim 19 , characterized by the following steps:

h) removal of the first and the second lens blank ( 100 a , 100 b ) from the work piece spindles ( 52 a , 52 b );

i) subsequent loading of one or the third and one or the fourth lens blank ( 100 c , 100 d ) into the work piece spindles ( 52 a , 52 b ) with the loading device ( 30 ) and loading of a fifth lens blank ( 100 e ) into the work piece holder ( 12 );

j) repeating of steps f) through i).

21. The method according to claim 18 and for the operation of a turning device ( 50 ), characterized in that each turning tool ( 53 a , 53 b ) has its own tool servomotor ( 75 a , 75 b ), by which an infeed depth (T) can be changed with respect to a coordinated work piece spindle ( 52 a , 52 b ), and control electronics are provided, the control electronics ( 54 ) attuning drive signals (S 1 a , S 1 b , S 2 , S 3 , S 4 a , S 4 b ) with each other such that the drive signals (S 4 a , S 4 b ) for the tool servomotors ( 75 a , 75 b ) accomplish an at least temporary opposite running of the tool servomotors ( 75 a , 75 b ) for vibration dampening.