Claims
- 1. A lens blank chuck assembly adapted for cooperatively mounting on the tailstock of lens generating apparatus and wherein an elongated generally cylindrical collet extends coaxially outward from said tailstock with said chuck assembly facilitating desired positioning of a lens blank relative to said generating apparatus, said chuck assembly comrising:
- a hollow generally cylindrical chuck body housing having spaced apart first inner and second outer ends with the chuck assembly longitudinal axis extending therebetween, the inside diameter of said chuck body being greater than the outside diameter of a collet on an associated lens generating apparatus;
- mounting means at said chuck body housing first end adapted for mounting said chuck assembly to an associated lens generating apparatus coaxial with the tailstock thereof, said mounting means allowing selective rotation of said chuck assembly about said longitudinal axis;
- receiving means disposed adjacent said chuck body housing second end adapted to mountingly receive a lens block having one face of a lens blank secured thereto at generally the lens blank frame center axis, said receiving means including means for positioning the lens block so that a predetermined desired optical center axis for the lens blank is positioned coaxial with said longitudinal axis to effect lens blank decentration; and,
- a pair of spaced apart retaining members radially interposed between opposite sides of said receiving means and the collet of an associated lens generating apparatus, said retaining members being radialliy movable toward and away from each other in response to selective closing and opening of the collet for causing said receiving means to be moved between lens block clamping and non-clamping conditions.
- 2. The chuck assembly as defined in claim 1 further including a face plate disposed at said chuck body housing second end and a lens blank support received by that portion of said face plate facing outwardly of said second end adapted to provide additional support for a lens blank at the one face thereof at least generally radially outward from the associated lens block.
- 3. The chuck assembly as defined in claim 2 wherein said retaining members are operatively secured to that portion of said face plate facing inwardly into said housing and further including first biasing means continuously urging said face plate toward a first normal position in located engagement with said chuck body housing second end.
- 4. The chuck assembly as defined in claim 2 further including interfitting means between said face plate and chuck body housing adjacent said second end for precisely locating said housing and face plate rotationally of each other and for allowing selective axial movement of said face plate outwardly of said housing second end.
- 5. The chuck assembly as defined in claim 3 further including second biasing means communicating with and urging said receiving means outwardly of said chuck body housing second end when said receiving means is moved to said non-clamping condition.
- 6. The chuck assembly as defined in claim 1 wherein said receiving means comprises a decentration bar having a lens block receiving opening therethrough generally closely configured to the mounting portion of an associated lens block and being located for automatically effecting a predetermined amount of lens blank decentration when said decentration bar is received in said chuck body housing, said decentration bar being selectively insertable into and removable from said housing second end when the collet of an associated lens generating apparatus is open.
- 7. The chuck assembly as defined in claim 6 wherein said decentration bar includes a slot axially therethrough extending radially outward from said receiving opening, the opposite side faces of said slot being movable toward and away from each other under the influence of said retaining members to assume said lens block clamping and non-clamping conditions.
- 8. The chuck assembly as defined in claim 1 further including rotate means for selectively incrementally rotating said chuck body housing with said receiving means and retaining members about said longitudinal axis between a first home position and a second rotated position arcuately spaced from said home position, said rotated position orienting a base line on an associated lens blank relative to associated lens generating apparatus.
- 9. The chuck assembly as defined in claim 1 further including canting means for selectively positioning an associated lens blank so that the optical center axis thereof is canted relative to said chuck assembly longitudinal axis to facilitate generating a predetermined amount of prism into the lens blank.
- 10. The chuck assembly as defined in claim 9 further including a face plate disposed at said chuck body housing second end and first biasing means urging said face plate toward a first normal position engaging said housing second end, said canting means comprising a shim member having a predetermined shimming dimension interposed between said face plate and said housing second end at a predetermined cooperative segment therebetween.
- 11. A lens block chuck assembly in combination with lens generating apparatus which facilitates some desired positioning of a lens blank relative to said generating apparatus and comprising:
- said lens generating apparatus including a tailstock which includes a hollow generally cylindrical collet extending coaxially outward therefrom and wherein at least the outer end of said collet is selectively movable between an open position and a closed position radially contracted from said open position;
- a hollow generally cylindrical chuck assembly body received over said collet in a radially spaced relationship therewith coaxial with said tailstock, said body having a first end operatively secured to said tailstock and a second end axially spaced therefrom generally coextensive with said collet outer end;
- a face plate disposed across said body second end and continuously biased by first biasing means generally axially of said body into a first normal position in engagement with said body second end;
- a pair of opposed retaining members radially spaced apart from each other adjacent the inwardly facing portion of said face plate with a portion thereof in operative communication with said collet adjacent said outer end, said retaining members being radially moved toward and away from each other between retaining and non-retaining conditions in response to movement of said collet between open and closed positioned; and,
- a lens blank decentration bar received by said face plate and positioned intermediate said retaining members with the central axis of said bar substantially coaxial with said tailstock, said bar including a lens block receiving opening axially therethrough configured to closely receive a lens block in a predetermined orientation and with said receiving opening being positioned in said bar so that a lens blank secured to said lens block will be positioned so that a predetermined optical center axis for the lens blank is automatically substantially coaxial with said tailstock, said decentration bar including clamping means adapted to be moved between clamping and non-clamping conditions with a lens block received in said lens blank receiving opening in response to movement of said retaining members between said retaining and non-retaining conditions.
- 12. The combination as defined in claim 11 further including second biasing means for urging said decentration bar outwardly from said body second end at least when said retaining members are moved from said retaining condition toward said non-retaining condition.
- 13. The combination as defined in claim 12 further including a biasing plate disposed within said collet in a spaced relationship from said collet outer end, said first and second biasing means cooperating with said plate.
- 14. The combination as defined in claim 11 wherein said retaining members are operatively secured to said face plate by securing means and said securing means allows limited radial movement of said retaining members relative to said face plate.
- 15. The combination as defined in claim 11 further including a support ring at the outwardly facing portion of said face plate adapted to provide support for a lens blank at an area generally radially outward from an associated lens block when the lens blank is processed by said lens generating apparatus.
- 16. The combination as defined in claim 11 wherein mounting means is interposed between said chuck assembly body first end and said tailstock for allowing selective rotational movement of said chuck assembly about the axis of said tailstock.
- 17. The combination as defined in claim 16 further including means for incrementally rotating said body between a first home position and a second rotated position arcuately spaced from said home position, said rotated position adapted to orient a base line on an associated lens blank relative to said lens generating apparatus.
- 18. The combination as defined in claim 11 further including canting means for selectively canting said face plate and retaining members relative to the axis of said tailstock for similarly canting said decentration bar as it is received in and retained thereby so that the optical center axis of an associated lens blank is canted by some predetermined amount to facilitate generating a desired amount of prism into said lens blank.
- 19. The combination as defined in claim 18 wherein said canting means comprises a shim member releasably interposed between said face plate and said body second end at a predetermined area of cooperation therebetween.
Parent Case Info
This application is a division of application Ser. No. 233,323, filed Feb. 11, 1981, and now U.S. Pat. No. 4,419,849, issued Dec. 13, 1983.
US Referenced Citations (8)
Divisions (1)
|
Number |
Date |
Country |
Parent |
233323 |
Feb 1981 |
|