Method and device for blocking eyeglass lenses

Patent metadata

Field	Value
Publication number	US-9694465-B2
Application number	US-201214360039-A
Country	US
Kind code	B2
Filing date	Nov 23, 2012
Priority date	Nov 23, 2011
Publication date	Jul 4, 2017
Grant date	Jul 4, 2017

Abstract

A blocking device and a method for blocking of eyeglass lenses on blocking pieces with a base body, with a blocking piece receiver which is located on the base body for the blocking piece which is to be attached to the eyeglass lens and with a positioning unit which is located on the base body for aligning and holding the eyeglass lens which is to be blocked, the blocking piece receiver and the positioning unit can be fixed on the eyeglass lens by activation being movable relative to one another via a lifting axis, the approach motion between the positioning unit and the blocking piece receiver being limited in the direction of the lifting axis by an adjustable stop means in at least two positions.

First claim

What is claimed is:

1. A method for blocking of an eyeglass lens with one holding side onto one coupling side of a blocking piece by means of an adhesive, the blocking piece being held in a blocking piece receiver and the eyeglass lens being movable relative to the blocking piece along a lifting axis, comprising the steps of:
a) first, placing a holding side of an eyeglass lens on an adhesive-free coupling side of a blocking piece and positioning the holding side relative to the coupling side of the blocking piece;
b) aligning the eyeglass lens together with one of a blocking piece receiver and the blocking piece by a pivoting movement;
c) producing a fixed relative position of the eyeglass lens relative to the blocking piece with a positioning unit and using a locking means for preventing further pivoting movement;
d) raising the eyeglass lens in the fixed relative position using the positioning unit;
e) applying an adhesive to at least one the coupling side of the blocking piece and the holding side of the eyeglass lens; and
f) using the positioning unit to cause the eyeglass lens in the fixed relative position to approach the blocking piece so as to move the holding side of the eyeglass lens into contact against the coupling side of the blocking piece so as to at least indirectly press the adhesive.

2. The method as claimed in claim 1 , wherein said aligning step comprises moving the positioning unit or an alignment element against a reference side of the eyeglass lens in a direction of a lifting axis so as to align the eyeglass lens together with the blocking piece receiver by pivoting around at least one pivot axis.

3. The method as claimed in claim 1 , wherein a stop is used to fix or define a position of the eyeglass lens with reference to the lifting axis when the eyeglass lens is fixed by the positioning unit in the fixed relative position; and
wherein the stop is adjusted so that an altered position of the positioning unit is achieved in the direction of the lifting axis and an increased distance is achieved between the blocking piece receiver and the positioning unit in the direction of the lifting axis when the eyeglass lens is moved onto the blocking piece by means of the positioning unit and the adhesive is pressed until the altered position of the stop is reached.

4. The method as claimed in claims 1 , wherein at least one of steps a), b), c), d), e) and f) is performed manually.

5. The method as claimed in claim 1 , wherein the coupling side of the blocking piece is provided with markings and the eyeglass lens has eyeglass lens markings, and wherein the markings of the blocking piece and the eyeglass lens markings are aligned relative to one another for positioning of the eyeglass lens.

6. The method as claimed in claim 1 , wherein at least one of the coupling side of the blocking piece and the holding side of the eyeglass lens is machined to be at least essentially complementary to each other with an accuracy of 0.5 mm or less.

7. A blocking device for blocking of eyeglass lenses on blocking pieces, comprising:
a blocking piece receiver which is located on a base body and to which an eyeglass lens is to be attached and
a positioning unit which is located on the base body for alignment and holding of the eyeglass lens which is to be blocked,
wherein the blocking piece receiver and the positioning unit are movable relative to one another in the direction of a lifting axis,
wherein the relative movement between the positioning unit and the blocking piece receiver in the direction of the lifting axis is limitable by at least one adjustable stop in at least two positions, and
wherein a coupling side of the blocking piece is essentially complementary to the holding side of a eyeglass lens with an accuracy of 0.5 mm or less.

8. The blocking device as claimed claim 7 , wherein the stop is movable incrementally or continuously into several positions.

9. The blocking device as claimed in claim 7 , wherein the stop has at least one stop surface which forms one end stop.

10. The blocking device as claimed in claim 7 , wherein the stop is a stop plate which is adjustable transversely to the direction of the lifting axis and is provided with several staggered stop surfaces.

11. The blocking device as claimed in claim 7 , wherein the stop is a stop nut which is adjustable in the direction of the lifting axis and has a stop surface or ramp which is adjustable transversely to the direction of the lifting axis.

12. The blocking device as claimed in claim 7 , wherein the positioning unit has a holding element which forms an alignment element.

13. The blocking device as claimed in claim 12 , wherein the holding element has a suction cup with an inner side connect to a source of negative pressure.

14. The blocking device as claimed in claim 13 , further comprising an illumination unit on or in the suction cup.

15. The blocking device as claimed in claim 13 , wherein the alignment element has two or three contact pins which act in the direction of the lifting axis and which are arranged circumferentially relative to at least one of the lifting axis and the suction cup, and which are positioned to be locatable against the eyeglass lens in the direction of the lifting axis.

16. The blocking device as claimed in claim 12 , wherein the alignment element has an axis of translation which runs parallel to the lifting axis, a coupling device for coupling the alignment element and the holding element, wherein lifting movement of the alignment element along the lifting axis and movement of the holding element along the axis of translation are synchronized in a coupled state and wherein the translational movement of the holding element place in the direction of the axis of translation is producible independent the lifting motion of the alignment element in an uncoupled state.

17. The blocking device as claimed in claim 16 , wherein at least one of the lifting movement and operation of the coupling device are manually producible.

18. The blocking device as claimed in claim 7 , wherein the blocking piece receiver has two pivot axes which are aligned at right angles to one another and at a right angle to the lifting axis and about which the blocking piece receiver is freely manually pivotable, and the blocking piece receiver being fixable in a position to which it has been pivoted.

19. A blocking device for blocking of eyeglass lenses on blocking pieces, comprising:
a blocking piece receiver which is located on a base body and to which an eyeglass lens is to be attached and
a positioning unit which is located on the base body for alignment and holding of the eyeglass lens which is to be blocked,
wherein the blocking piece receiver and the positioning unit are movable relative to one another in the direction of a lifting axis,
wherein the relative movement between the positioning unit and the blocking piece receiver in the direction of the lifting axis is limitable by at least one adjustable stop in at least two positions, and
wherein the stop is movable incrementally or continuously into several positions.

20. The blocking device as claimed in claim 19 , wherein the stop has at least one stop surface which forms one end stop.

21. The blocking device as claimed in claim 19 , wherein the stop is a stop plate which is adjustable transversely to the direction of the lifting axis and is provided with several staggered stop surfaces.

22. The blocking device as claimed in claim 19 , wherein t

Assignees

• Schneider Gmbh & Co Kg

Inventors

• Schneider Gunter
• Börner Ulf

Classifications

• B24B13/005 Primary

  Blocking means, chucks or the like; Alignment devices · CPC title

• B24B13/0055 Primary

  Positioning of lenses; Marking of lenses · CPC title

• B24B47/225

  for bevelling optical work, e.g. lenses · CPC title

• B24B47/22

  Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation · CPC title