Method and device for blocking eyeglass lenses

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.

Claims

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 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.

23. 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 positioning unit has a holding element which forms an alignment element.

24. The blocking device as claimed in claim 23, wherein the holding element has a suction cup with an inner side connect to a source of negative pressure.

25. The blocking device as claimed in claim 24, further comprising an illumination unit on or in the suction cup.

26. The blocking device as claimed in claim 24, 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.

27. The blocking device as claimed in claim 23, 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.

28. The blocking device as claimed in claim 27, wherein at least one of the lifting movement and operation of the coupling device are manually producible.

29. 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 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.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 is a perspective view of a blocking device in accordance with the invention;

(2) FIG. 2 is a perspective view of the blocking device with the camera folded away and the suction cup lowered;

(3) FIG. 3 is a schematic vertical sectional view of the blocking device according to FIG. 2;

(4) FIG. 4 is a schematic vertical sectional view of the blocking device according to FIG. 1 from the front;

(5) FIG. 5 is a schematic vertical sectional view of the blocking device according to FIG. 2 from the front;

(6) FIG. 6 is a schematic vertical sectional view of the blocking device with the eyeglass lens blocked;

(7) FIG. 7 is an enlarged extract from FIG. 2 in the upper region of the blocking device with an end stop;

(8) FIG. 8 is a schematic sectional view of the end stop;

(9) FIG. 9 is a schematic sectional view of the end stop according to another version;

(10) FIG. 10 is a schematic sectional view of the end stop according to a further version;

(11) FIG. 11 is a schematic sectional plan view or schematic diagram relating to the alignment of the eyeglass lens using light patterns;

(12) FIG. 12 is a schematic sectional plan view or schematic diagram relating to the alignment of the eyeglass lens by means of markings;

(13) FIG. 13 is a perspective view of the blocking device according to another version;

(14) FIG. 14 is a perspective view of the blocking device according to a further version; and

(15) FIG. 15 is a schematic diagram for illustration of prismatic tilting.

DETAILED DESCRIPTION OF THE INVENTION

(16) The same reference numbers are used for the same or same type of parts and components, the same or corresponding properties arising even if a repeated description is omitted.

(17) FIG. 1 shows a blocking device 1 in accordance with the invention in a perspective view. The blocking device 1 preferably has a blocking piece receiver 2 for a blocking piece 9. The blocking piece 9 is used to receive and hold an eyeglass lens 8. The eyeglass lens 8 is especially an eyeglass lens made of plastic or a plastic lens. It is especially a lens blank. In the illustrated state the eyeglass lens 8 with its holding side 8.1 facing the blocking piece 9 rests on the blocking piece 9 or its coupling side 9.1. The reference side 8.2 which faces away from the blocking piece 9 or the still unmachined side or flat side 8.2 of the eyeglass lens 8 faces up in the illustrated example.

(18) The blocking device 1 preferably has an especially C-shaped base body or machine body 1 on whose lower side the blocking piece receiver 2 is provided for a blocking piece 9 for an eyeglass lens 8. Preferably, the blocking piece receiver 2 can be tilted or pivoted around two pivot axes K1, K2. Via these pivot axes K1, K2, the blocking piece receiver 2, and thus, the blocking piece 9 can be pivoted relative to an eyeglass lens 8 which is to be located on it or can be moved and aligned in one tilting motion.

(19) The blocking device 1 preferably has a positioning apparatus or unit 3. The positioning unit 3 is used especially for aligning and/or lifting or lowering of the eyeglass lens 8 which is to be located on the blocking piece 9. In particular, the eyeglass lens 8 can be linearly moved in the direction of a preferably vertically running lifting axis or axis of motion H1 by means of the positioning unit 3, especially preferably can be raised and lowered.

(20) The positioning unit 3 preferably has a holding element 3.1 which is made especially as a rack, an assigned suction cup 3.3 and/or an assigned drive 3.9.

(21) On the top end, there is the drive 3.9 for the holding element 3.1 which is made preferably as a pull-push rod with the suction cup 3.3 located preferably on the lower end. The holding element 3.1 with the suction cup 3.3 can be moved up and down in translation in the direction of the preferably vertical lifting axis H1 via the drive 3.9 which can preferably be manually operated.

(22) Parallel to this lifting motion along the lifting axis H1, there is preferably a carriage 3.8a which is guided or can be displaced over a corresponding rail 3.8b on the base body 1.1 or the blocking device 1 in the direction of a parallel or vertical axis of translation T1. The positioning unit 3 or its carriage 3.8a has or bears preferably an alignment element 3.2 which can be placed against the eyeglass lens 8 or its reference side 8.2 especially via three contact pins 3.2a-3.2c. The alignment element 3.2 can preferably be coupled to the holding element 3.1 to be axially immovable via an especially radially acting coupling 3.7 so that this assembly which is preferably called the positioning unit 3 can be moved if necessary or alternatively jointly via the drive 3.9 in translation in the direction of the lifting axis H1 or the axis of translation T1 or vertically.

(23) Preferably, the face side or coupling side 9.1 of the blocking piece 9 facing the eyeglass lens 8 which is to be blocked is matched to the preferably pre-shaped or already machined, especially preferably arched holding side 8.1 of the eyeglass lens 8, especially is preferably made at least essentially complementary to it. In particular, the matching of the blocking piece 9 or of the coupling side 9.1 takes place by corresponding selection of the blocking piece 9 from a plurality of different blocking pieces 9 or especially preferably by prior, in particular machining of the blocking piece 9 or the coupling side 9.1. Especially preferably, the blocking piece 9 is made of plastic and is accordingly very light, in particular it can be machined in the desired manner in a machine tool which is not shown for machining of eyeglass lenses.

(24) Preferably, the eyeglass lens 8 is first placed directlytherefore without an adhesiveon the blocking piece 8 prior to the actual blocking with the blocking piece 9 so that the holding side 8.1 (optionally with a protective layer or cover film) lies directly on the coupling side 9.1.

(25) After placement, first of all, preferably an alignment of the eyeglass lens 8 takes place relative to the blocking piece 9. This alignment preferably comprises alignment by shifting crosswise, turning and/or tilting.

(26) The alignment by crosswise shifting, therefore in the radial direction with respect to the lifting axis H1 or a center axis of the blocking piece 9 or in a plane parallel to the reference side 8.2 of the eyeglass lens 8, takes place preferably manually and/or by means of a corresponding light pattern 3.6 or markings 8.3 and 9.2, as is detailed below.

(27) The alignment by turning, therefore fixing of a rotary position of the eyeglass lens 8 relative to the blocking piece 9 takes place preferably by means of a corresponding light pattern 3.6 or markings 8.3 and 9.2, as will be detailed below.

(28) For alignment by tilting, the eyeglass lens 8, the blocking piece 9 or the latter in its tilt position are pivoted relative to one another, especially around at least one pivot axis K1, K2, in particular so that the preferably not yet machined or planar top or reference surface 8.2 of the eyeglass lens 8 assumes a desired alignment, especially preferably in the horizontal. The alignment takes place preferably by the positioning unit 3 or by the alignment unit 3.2.

(29) Based on the pivot axes K1, K2, especially on the blocking piece receiver 2, or other especially free tilting capacity, it can be preferably optionally tilted with the eyeglass lens 8 which rests with its holding side 8.1 on the blocking piece 9 or its coupling side 9.1 according to FIG. 1a. Preferably, the eyeglass lens 8 can also be pivoted relative to the blocking piece 9. Thus, the reference side 8.2 can be aligned as desired by the alignment element 3.2 or by the contact pins 3.2a-3.2c or the suction cup 3.3.

(30) Furthermore, before or afterwards, an alignment of the rotational position, therefore the pivoting position, of the eyeglass lens 8 relative to the blocking piece 9 takes place. To do this for example optics, an image recording unit or a camera 3.5 of the blocking device 1 or positioning unit 3 can be used, as is shown schematically in FIG. 1. In FIG. 1 the camera 3.5 is located in the axis of movement or lifting axis H1. FIG. 2 shows in a similar perspective arrangement the blocking device 1 with the camera 3.5 moved or pivoted out of the axis of movement H1. Here the positioning unit 3 or the holding element 3.1 or the suction cup 3.3 has already been lowered onto the eyeglass lens 8 or its reference side 8.1. FIG. 3 shows the blocking device 1 in a vertical section in this state.

(31) The blocking piece receiver 2 can preferably be freely pivoted in a spherical cup 2.1. The two indicated pivot axes K1, K2 which are preferably aligned at right angles to one another are preferably only of a theoretical nature, since preferably a free pivoting capacity of the blocking piece receiver 2 in the spherical cup 2.1 is enabled in the illustrated example. But, other, for example, universal rocker bearing arrangements or axle arrangements are also possible.

(32) In the aligned relative position, the suction cup 3.3 is attached or fixed on the surface 8.2 by means of negative pressure being applied between the eyeglass lens 8 and the positioning unit. Preferably, at the same time, the holding element 3.1 is coupled to the carriage 3.8a via the coupling 3.7, and thus, the alignment element 3.2 is fixed relative to the suction cup 3.3. By applying negative pressure, a contact force of the eyeglass lens 8 against the positioning unit 3 or the contact pins 3.2a-3.2c occurs so that a displacement of the eyeglass lens 8 relative to the positioning unit 3, i.e., relative to the suction cup 3.3 or relative to the alignment element 3.2, is no longer possible. To do this, a translational displacement movement of the suction cup 3.3 or of the alignment element 3.2 on the lens surface would be necessary; this is not possible due to the holding force of the suction cup 3.3.

(33) The drive 3.9 preferably has a control lever 3.9a via which the holding element 3.1 which is made here as a rack can be easily moved in the direction of the lifting axis H1, as shown in FIG. 3.

(34) With the coupling 3.7 released, the alignment element 3.2, preferably solely due to the force of gravity, especially supported by the mass of the carriage 3.8a and the coupling 3.7 makes contact against the eyeglass lens 8 in the direction of the axis of translation T1 and ensures or supports a corresponding alignment and contact of the eyeglass lens 8 against the contact pins 3.2a-3.2c. With the coupling 3.7 opened, regardless of this contact motion in the direction of the axis of translation T1, the holding element 3.1 with the suction cup 3.3 is brought into contact against the eyeglass lens 8 in the direction of the lifting axis H1. In this lower position P1, preferably a stop ring 3.1a which is guided on the upper end of the rack 3.1 is coupled to the rack 3.1 via a coupling element 3.1b. Thus, preferably, an end stop E which is formed by the base body 1.1 as a stop means is defined with a first position P1.

(35) To raise the contact pins 3.2a-3.2c, the holding element 3.1 with the suction cup 3.3 is preferably raised so far that the suction cup 3.3 makes contact against the carriage 3.8a, especially against a leg of the carriage 3.8a which guides the holding element 3.1, and guides the carriage upward at the same time. In this upper position of holding element 3.1, which has been moved up by a dimension H as shown in FIG. 4, there is preferably a catch position of the drive 3.9 so that preferably activation or actuation of the drive 3.9 is necessary to travel down.

(36) After completed contact or resting with the preceding alignment of the eyeglass lens 8 on the blocking piece 9, the pivot axes K1, K2 are blocked or the blocking piece receiver 2 in spherical cup 2.1, as shown in FIG. 5, is blocked especially by means of or by applying negative pressure, preferably by actuation of a switch 4.1 (see, FIGS. 1 and 2). Thus, altogether the relative position between the eyeglass lens 8 with its reference side 8.2 on the one hand and the blocking piece 9 which rests on the blocking piece receiver 2 on the other is fixed, except for the lifting motion along the lifting axis H1.

(37) After raising the eyeglass lens 8, an adhesive 10, especially of plastic, can be applied to the blocking piece 9 and/or the eyeglass lens 8.

(38) The adhesive 10 is preferably applied in the hot state and/or is heated, especially to liquefy it and/or to make it adhesive.

(39) After applying the adhesive 10, the eyeglass lens 8 is lowered again by means of the positioning unit 3, especially by actuating the drive 3.9. In particular, the eyeglass lens 8 is pressed against the preferably still warm or not yet set adhesive 10, and thus, against the coupling side 9.1 of the blocking piece 9. Especially preferably, the eyeglass lens 8 is caused to approach only the blocking piece 9 and especially a predetermined distance a is maintained, as is explained in detail below. However, alternatively, it is also possible to apply pressure with a predetermined and/or path-dependent force which decreases especially toward the eyeglass lens 8.

(40) To place the eyeglass lens 8 against the coupling side 9.1 of the blocking piece 9, which side is provided with the adhesive 10, as shown in FIG. 6, a stop means 1.2 is inserted or pushed in laterally according to the direction of the arrow preferably between a stop which is formed preferably by a stop ring 3.1a on the holding element 3.1, on the one hand, and the base body 1.1 or other thrust bearing, on the other. In this way, the end stop E is changed or a new or altered position P2 is formed so that according to the thickness a of the stop means 1.2, the predefined or desired distance a between the eyeglass lens 8 and the blocking piece 9 is ensured. Thus, the eyeglass lens 8 is positioned with the indicated distance a relative to the blocking piece 9 so that the adhesive 10 which is contained between the eyeglass lens 8 and the blocking piece 9 is present or spread in a corresponding thickness between the eyeglass lens 8 and the blocking piece 9.

(41) According to FIGS. 2 and 3, the alignment element 3.2 and the suction cup 3.3 are placed against the eyeglass lens 8 preferably as described above and the suction cup 3.3 is fixed. On the top end of the rack 3.1, there is preferably the stop ring 3.1a which rests against the base body 1.1, therefore the end stop E, in position P1, and then, is preferably fixed by clamping onto the holding element 3.1, especially pneumatically or by negative pressure.

(42) After raising the eyeglass lens 8 for purposes of supplying adhesive to the blocking piece 9, the stop means 1.2, with height a as shown in FIGS. 6 & 7, is moved to the left in the direction of the arrow so that after subsequently depositing the eyeglass lens 8 again, for purposes of contact against the adhesive, the stop ring 3.1a makes contact against the stop means 1.2. The stop means 1.2 forms the new end stop E in position P2 so that the eyeglass lens 8 is now positioned with a distance a that is preferably from roughly 0.5 mm to 1.5 mm (here shown enlarged) above the blocking piece 9. However, the height of the stop means 1.2 can be chosen at will.

(43) The activation or movement of the stop means 1.2 takes place preferably with a time delay so that the new end stop E is only present when the operator has moved the positioning unit 3 up for purposes of feeding adhesive 10. With simultaneous activation, therefore together with the coupling 3.7 and the suction cup 3.3, the stop means 1.2 would be located laterally against the stop ring 3.1a with pretensioning; but this would also be fundamentally possible.

(44) The stop means 1.2 can also be made according to FIG. 8 as a stop plate with different stop surfaces f1, f2, f3. FIG. 8 shows the end stop E in another position P3. Alternatively, a wedge-shaped stop part according to FIG. 9 is also possible, and in this case the lateral positioning must be done much more precisely.

(45) The stop means 1.2 can also be made according to FIG. 10 as a stop nut which can be adjusted steadily via a thread 1.2b relative to the stop ring 3.1a in the direction of the lifting axis H1.

(46) The positioning unit 3 or the holding element 3.1 is therefore preferably lowered only until the altered end stop E or the altered new position P2 is reached. After reaching this altered (higher in the illustrated example) end position P2, further actuation of the drive 3.9 is no longer possible and/or further lowering of the eyeglass lens 8 onto the blocking piece 9 is no longer possible. Accordingly, the predetermined or desired distance a between the blocking piece 9 and the eyeglass lens 8 is maintained. This distance a therefore dictates the thickness of the adhesive layer.

(47) It is noted that, in place of the change of the position P1 of the end stop E, which was described only rudimentarily using FIG. 6, to the position P2 by pushing the stop means 1.2 in between, other designs are also possible. In particular, some other mechanical adjustment or change of the end stop E, but alternatively, optionally also for example, a change of a setpoint is possible during control or adjustment.

(48) For purposes of applying negative pressure to the inner side 3.4 of the suction cup 3.3, there is preferably a pressure line 3a which can be supplied accordingly with negative pressure. The same applies preferably to the coupling 3.7 and a coupling element 3.1b of the stop ring 3.1a which have a negative pressure supply 3.7a, 3.1c. The suction cup 3.3 and the couplings 3.7, 3.1b are then preferably exposed to negative pressure at the same time.

(49) The coupling 3.7 and the coupling element 3.1b (coupling of the stop ring 3.1a) can also be actuated or triggered independently of one another and/or independently of the suction cup 3.3.

(50) According to FIGS. 4 & 5, the blocking piece receiver 2 preferably has a bearing 2.1 which is made as a spherical cap and via which it can be brought into the desired position. By applying negative pressure to the bearing 2.1 (especially controlled by the switch 4.1 or in some other way), the blocking piece receiver 2 is fixed in the bearing 2.1. In this or some other way, a locking means 4 for blocking or fixing the pivot axis (axes) K1, K2 can be implemented.

(51) According to FIGS. 4 & 5, preferably within the suction cup 3.3, there is preferably an illumination unit 3.6. Via the illumination unit 3.6, a light pattern 3.6a, 3.6b can be produced (as indicated schematically in FIG. 11) for purposes of orientation or alignment of the eyeglass lens 8 relative to the positioning unit 3 or suction cup 3.3 and to facilitate positioning of the eyeglass lens 8 as a positioning aid.

(52) According to FIG. 11, these light patterns can be made as a centric mid-point circle 3.6a or as a concentric peripheral circle 3.6b. On the eyeglass lens 8 or on its reference side 8.2, the location of the suction cup 3.3 or the desired position of the eyeglass lens 8 is shown so that the eyeglass lens 8 can be aligned accordingly relative to the blocking piece 9, especially by lateral displacement, turning and/or tilting.

(53) According to FIG. 12 the eyeglass lens 8 preferably has one or more visible eyeglass lens markings 8.3 while the blocking piece 9 preferably has one or more corresponding markings 9.2 which can be optically brought into agreement by the user. This can be achieved without optical aids or also based on the picture obtained by the camera 3.5, as explained below. The latter is much more accurate since a preferably centric view of the indicated markings 8.3, 9.2 is possible via the camera 3.5.

(54) According to FIGS. 1 and 2, the camera 3.5 can be moved into a roughly horizontal position (FIGS. 1, 4) out of a lateral, vertically aligned position (FIGS. 2, 5) via a pivoting axis 3.5a. In this horizontal position, an objective lens 3.5b of the camera 3.5 is aligned concentrically to the lifting axis H1 or a center axis M. In this position, the objective lens 3.5b is concentric to the eyeglass lens 8 so that the marking 8.3 according to FIG. 11 and/or FIG. 12 can be acquired in the centric viewing direction. The camera picture is displayed to the user via a monitor which is not shown so that he can align the eyeglass lens 8 as desired to the blocking piece 9.

(55) To operate the camera 3.5, it preferably has a handle 3.5c by means of which the camera 3.5 can be moved into the indicated horizontal position. When the camera 3.5 is released, it swivels, preferably by itself, into the vertical lateral position as shown in FIG. 4, especially as a result of a center of gravity S which is located off-center to the pivoting axis 3.5a. In this position the positioning unit 3 or the suction cup 3.3 can be adjusted.

(56) The aforementioned alignment aids 3.6a, 3.6b, 8.3, 9.2 can, of course, be used in any combination. The camera 3.5 viewed in this way is not strictly necessary. The same applies to the light patterns 3.6a, 3.6b. For example, the two markings 8.3, 9.2 which can be aligned with respect to one another would be sufficient by themselves. Alternatively, the sole use of the light patterns as shown in FIG. 12 would be sufficient if the centric placement of the eyeglass lens 8 alone were all that mattered.

(57) FIG. 13 shows an alternative embodiment, the blocking device 1 or the positioning unit 3 not having a coupling 3.7 or an alignment unit 3.2. The blocking piece receiver 2 and the blocking piece 9 which rests preferably indirectly on it and the eyeglass lens 8 are aligned in position individually only by the suction cup 3.3, so that the suction cup 3.3 is then fixed on the eyeglass lens 8 after supplying negative pressure. Tracking of the positioning unit 3 due to the narrowing suction cup 3.3 which is contracting in the axial direction can possibly be necessary during fixing. After fixing of the two pivot axes K1, K2, especially via the locking means 4 or the switch 4.1, as in the above described embodiment, there remains thus only one free lifting motion in the direction of the lifting axis H1 which ensures application of adhesive 10 between the eyeglass lens 8 and the blocking piece 9.

(58) It be noted that the alterable end stop E can also be completely omitted if necessary. FIG. 14 shows this exemplary embodiment.

(59) The embodiment according to FIG. 14 also shows that the pivot axes K1, K2 can also be arranged or implemented differently. Here, for example, the first tilting axis K1 is assigned to the alignment element 3.2 and the second tilting axis K2 which runs transversely to it is assigned to the blocking piece 9 or the blocking piece receiver 2. Therefore, here, the alignment element 3.2 can be tilted or pivoted around the tilting axis K1. The blocking piece 9 conversely can be tilted or pivoted only around the second tilting axis K2 here.

(60) The suction cup 3.3 can alternatively or additionally be tilted or pivoted around an (imaginary) pivot axis F1. Therefore, in particular, different axis stackings are possible.

(61) FIG. 15 shows in a schematic how the pivot axis K1 can compensate for a prismatic tilting of the eyeglass lens 8 so that the suction cup 3.3 can be seated as free of tilting as possible on the top or reference side 8.2 of the eyeglass lens 8. By corresponding alignment of the eyeglass lens 8 or blocking piece 9 in the peripheral direction, prismatic tilting, whether tilting of the eyeglass lens 8 and/or of the blocking piece 9, can be aligned to the desired pivot axis K1. This is advantageous especially when there is only one single pivot axis K1. In particular, the axis of prismatic tilting will then be preferably aligned parallel to the tilting axis K1. Accordingly, if necessary, only one single tilting axis K1 is sufficient.

(62) Individual aspects and features of the different embodiments can be combined with one another at will, but can also be implemented independently of one another.