EP1243381A2 - Appraratus for blocking optical lenses - Google Patents

Abstract

The appliance consists of two rotary holder-shafts (10,12), and a block-piece (14) detachably positioned on one side of the optical lens. an adapter (18) for the block-piece is rigidly joined to one of the holder shafts. A sub-assembly clamp (20) has a fixture section joined to a clamping section on one side (26) of the lens. On the opposite side, the sub-assembly has a spherical-headed protuberance contained in a container with parallel grooves. The clamping section swivels on two tilt-axes.

Description

The invention relates to an arrangement for blocking and Clamping of optical lenses to be machined on the edge, in particular Eyeglass lenses, according to the preamble of the claim 1.

If we speak of "glasses" below, are among them optical lenses or lens blanks for glasses from the common materials such as polycarbonate, mineral glass, CR 39, HI index, etc. and with any shape of the peripheral edge to understand the lens or lens blank, which before the Machining their edge optically on one or both effective area (s) can be machined but need not.

In the field of lens edging, the goal of which is to finish the edge of a lens so that the spectacle lens can be inserted into a spectacle frame, Various arrangements or systems are known which are associated with this serve to block out the spectacle lens for edge processing and relative between the rotatable and in the axial direction mutually adjustable holding shafts of a lens processing machine clamp.

Ein Blockstück, das lösbar an einer Seite des Brillenglases angebracht werden kann (siehe z.B. EP-A-0 235 543: Fig. 4 und 5; EP-A-0 839 603: Fig. 1 und 2);

ein Adapter für das Blockstück, der mit einer der Haltewellen der Brillenglasrandbearbeitungsmaschine starr verbunden werden kann und zur drehwinkelorientierten Drehmitnahme des Blockstücks ausgebildet ist (siehe z.B. EP-A-0 235 543: Fig. 1 bis 3; EP-A-0 839 603: Fig. 5); und

eine Spannbaugruppe, die einen Befestigungsabschnitt hat, der mit der anderen Haltewelle der Brillenglasrandbearbeitungsmaschine starr verbunden werden kann, sowie einen mit dem Befestigungsabschnitt verbundenen Spannabschnitt aufweist, der zum kraftschlüssigen Angriff an die andere Seite des Brillenglases ausgebildet ist (siehe z.B. EP-A-0 995 546).

These systems consist of at least the following components:

A block piece that can be detachably attached to one side of the lens (see, for example, EP-A-0 235 543: FIGS. 4 and 5; EP-A-0 839 603: FIGS. 1 and 2);

an adapter for the block piece, which can be rigidly connected to one of the holding shafts of the spectacle lens edge processing machine and is designed for rotationally oriented rotation of the block piece (see, for example, EP-A-0 235 543: FIGS. 1 to 3; EP-A-0 839 603: Fig. 5); and

a clamping assembly which has a fastening section which can be rigidly connected to the other holding shaft of the lens processing machine, and has a clamping section which is connected to the fastening section and is designed for non-positive engagement with the other side of the spectacle lens (see, for example, EP-A-0 995 546).

With regard to further known designs of the block piece and the block adapter is still in this context to the brochure "WECO Block-up System. D 704. Wernicke & Co. GmbH, Düsseldorf, 3/1990 "as well as DE-A-198 31 305. In the first-mentioned prior art, the block adapter has or the clamping bush as a positioning element only an eccentrically arranged centering pin. Here there is the risk of the block piece tipping over when it is in contact with the Clamping bushing should be engaged so that the mutual rotary driving elements, i.e. the gears for Can reach the system before a rotation angle orientation of Block piece and clamping bush is done. According to the second State of the art is in a driver slot of the block a desaxed hole arranged, in which a corresponding Pin on a provided on a lens support shaft Recording head engages to position the raw glass with the block to be able to attach to the recording head. Because the daxed hole arranged as a positioning element in the driving slot the rotary drive elements come before the positioning elements engaged.

To fix the block on the glasses are in the stand the technology already called fastening foils, adhesive pads, become known, provided with adhesive on both sides (see e.g. DE-U-92 00 513). There is a problem here in that the fastening film after finishing the processing of the lens and removal of the block piece from the lens often remains on its optical surface and thus must be removed from there, with the risk that Scratches appear on the optical surface or a possible one Coating, e.g. an anti-reflective layer, is damaged.

With regard to a further known design of the clamping assembly finally, reference is made to DE-A-25 06 866, which discloses a lens holder with a half-wave, which carries a spherical head at its end. With the free, The surface of the spherical head facing away from the half-wave has an effect dome-shaped recess in a disc-shaped contact piece so together that the ball head and the recess form a ball joint through which the disc-shaped contact piece any required inclination to the axis the half wave can take. The transmission of the torque between the half-wave and the system piece takes place via a Cross pin provided on the ball head, which in a on the contact piece engages existing groove, the ends of the cross pin are always spaced from the radial ends of the groove. at the disc-shaped contact piece is this state of the art held by a screw on the ball head, which is through an opening in the piece and extends into the Ball head is screwed in. On the one facing away from the ball head The screw extends through one side of the contact piece slidable on the contact piece, directly on the lens adjacent pane and grips behind it Disk with her head. With this state of the art Tilting of the contact piece strongly with respect to the ball head hindered by the friction between the disc and the abutment. In addition, this known ball joint is construction-related both in the axial direction and in the radial Direction undesirable play.

The invention is based on the prior art, for example EP-A-0 235 543 is based on the task of a improved handling compared to the previously known solutions Arrangement for blocking and clamping optical lenses, in particular To create glasses that also in the sense of a optimized play-free rotation of the optical lens is.

This object is achieved by the in claims 1, 14 and 21 respectively specified features solved. Advantageous or expedient Developments of the invention are the subject of the claims 2 to 13, 15 to 20 and 22 and 23.

By the training according to the invention specified in claim 1 the clamping assembly is a very precise and play-free torque transmission with a very smooth angle compensation allows. The one stored in its receiving section Ball head with its two projections allows gimbal-like superimposed movements around two tilt axes at practical backlash-free rotational driving through the assigned holding shaft due to the engagement between the protrusions and the Grooves of the receiving section. Because the groove bottom of each of the grooves in cross section one to the end region of the associated projection Complementary or form and dimension-appropriate training has, results in the groove cross section and projection longitudinal section considers a positive engagement between the projections and the grooves, which for a play-free Rotational motion transmission between ball head and receiving section is advantageous. The freedom of play thus achieved lowest wear and at the same time easier tilting is an essential prerequisite for high-precision Edge processing of spectacle lenses in industrial grade Machinery.

An alignment that is exactly aligned with the first tilt axis the two projections of the ball head can be through the Achieve measures of claim 2, the introduction one projecting on both sides above the ball head protruding pin in one with its central axis through the Provide a through hole in the center of the ball that Encloses the pin without play.

By the cylindrical surface areas specified in claim 3 on both projections in cooperation with these Flat guide surfaces of the grooves assigned to surface regions according to claim 4 ensures that with pivoting movements around the second tilt axis, the rotation-free essentially Guidance of the projections in the grooves is retained.

With regard to easy tilting of the clamping section it is also advantageous if the end areas the projections provided on the ball head according to claim 5 spherical dome-shaped.

A manufacturing-favorable design of the pin looks according to claim 6 before that the pen is continuous, but with one exception its spherical cap-shaped end areas, continuously cylindrical is formed so that the mentioned cylindrical Areas in their matching diameters the identical pin diameter itself are defined. The total length of the pin is according to claim 7 the radial distance of the groove bases is determined by only one Narrow play is greater than that on the outside due to the spherical dome shape Pen length measured at the ends of the pen.

The pin can be firmly seated from the through hole in the ball head be enclosed, but preferably it is corresponding Claim 8 added in the sliding seat in the through hole, which has the advantage that when inserting the pin in the through hole does not match exactly and with little tolerance axial projection dimensions must be observed. When inserting of the ball head in the receiving section the axially displaceable in the through hole of the ball head To a certain extent, pin according to the location of the groove bases automatically the correct axial projection dimensions.

The axial securing of the ball head after its introduction in the receiving section takes place according to claim 9.

As indicated in claim 10, the ball head is the fastening section assigned to the clamping assembly during the Receiving section assigned to the clamping section of the clamping assembly is. Here, according to claim 11 by means of a Locking device on the fastening section a detachable Fastening the clamping assembly on the relevant holding shaft respectively. The rotational driving through this holding shaft serves after Claim 12 attached at one end to the fastening section Groove in which a guided by the holding shaft Cross pin engages non-rotatably and without play.

As stated in claim 13, the tensioning section has frictional attack on the optical lens a coating on a comparatively softer material than that There is damage to the lens surface at the lens Lens loading, edge processing and lens removal to avoid.

In continuation of the inventive concept, the arrangement comprises a block piece and a block for blocking optical lenses Block adapter, which in a special way, as in claim 14 is specified, on the one hand, for the positive rotational driving the block by the block adapter and on the other for the correct positioning of block and Block adapter are formed. To this end, both point Block piece as well as block piece adapter on the one hand rotary driving elements and on the other hand positioning elements. The Positioning elements are made by several projections on one of the two consisting of block piece and block piece adapter Share and through the projections complementary recesses the other of the two parts. The arrangement is there taken so that the end faces of the projections in an imaginary common plane perpendicular to the axis of rotation, while the recesses from one level to these common go out plane-parallel flat surface. In addition, the axial Distance between the rotary driving elements and the positioning elements on the block piece different from the axial Distance between these elements on the block adapter. by virtue of this training according to the invention come on approach of the block piece on the not yet correct angle of rotation arranged block adapter first the end faces of the Projections for contact with the flat, the recesses Surface without the rotary driving elements with each other intervention. Then the correct rotation angle orientation by rotating the block piece relative to the block piece adapter brought about, the end faces of the projections the projections slide on the flat surface mentioned finally, axial alignment between block piece and block piece adapter provided in the recesses for fixation the relative angle of rotation position until further approximation of the block piece on the block piece adapter the rotary driving elements engage with each other.

As is apparent from claim 15, three projections and accordingly three recesses may be provided, the Projections or their end faces and the recesses or whose entry openings each correspond to the corner points Form triangles. Because of this configuration, it happens a secure tilt-free support of the block piece the block adapter without partial rotary driving elements get into an unwanted intervention. in this connection the projections hold the block piece to the block piece adapter Distance until the correct relative angle of rotation position is reached is. Then all the rotary driving elements then reach the circumference engaged.

According to claim 16 is to facilitate the entry of the projections provided in the recesses that the projections starting from their end faces and / or the recesses starting from the flat surface at their entry openings Show chamfers.

Preferably and as indicated in claim 17, are located the projections on the block adapter and the recesses on Block piece.

The block piece has another important aspect of the invention according to claim 18 a the positioning elements having hub portion and an elastically connected thereto outer ring portion, which the rotary driving elements of the Block piece carries. The elastic connection to the ring section and the hub section allows a lightened and better adaptation of the block piece to the curvatures of the machined Lens.

The aforementioned elastic connection between the hub section and ring section can according to claim 19 by a A plurality of webs or the like distributed evenly around the circumference. be brought about. When the block is injection molded a suitable thermoplastic plastic can hub section, The webs and ring section can be formed in one piece. Instead of individual webs can between the hub section and Ring section also a circumferentially continuous annular thin-walled connection can be provided, which similar flexible deformation between ring section and hub section allows for adaptation to a lens curvature.

The rotary driving elements on the block piece and on the block piece adapter are according to claim 20 as complementary ring gear or ring gear sections formed. These ring gears have due to their radial tooth alignment in Connection with complementary conical design of the ring gear centering a block piece and block piece adapter Effect.

The invention further sees a particular one according to claim 21 trained adhesive film section with which the Block piece and the optical lens for the edge processing can be detachably but non-rotatably connected. Here is the double-sided adhesive film section with regard to the adhesive adhesive forces of its two adhesive layers differently designed so that the adhesive force on the side of the adhesive film section facing the block piece is higher than on the lens side. In this way When removing the lens, it is ensured that the adhesive film section remains releasably attached to the block and thus does not have to be removed from the lens surface, causing surface damage the lens or adhesive residue on the Could cause lens. For easier removal of the Adhesive film section of the block piece according to claim 22 on the adhesive film section one over the outer circumference of the Block piece protruding tab may be provided, at least non-adhesive on its side facing the optical lens to avoid sticking to the lens.

The adhesive film section can in the arrangement according to the invention extremely thin compared to the prior art be trained. According to claim 23, it has only a thickness between about 0.025 and 0.2 mm compared to a conventional one Thickness from about 0.5 to 0.8 mm. Because of this very low Thickness due to the elastic deformability of the Block piece as described with reference to claims 18 and 19 is enabled, arise in the adhesive film section due to the acting torsional forces no deformation or Walk phenomena.

Fig. 1

eine perspektivische Explosionsdarstellung einer erfindungsgemäßen Anordnung zum Blocken und Spannen eines am Rand zu bearbeitenden Brillenglases, die von unten nach oben einen an einer schematisch dargestellten unteren Haltewelle montierten Blockstückadapter, ein Blockstück, einen Klebefolienabschnitt, das Brillenglas sowie eine an einer schematisch dargestellten oberen Haltewelle montierte Spannbaugruppe zeigt,

Fig. 2

eine Schnittansicht der in Fig. 1 dargestellten Anordnung in Funktionslage,

Fig. 3

eine Schnittansicht der Spannbaugruppe gemäß Fig. 2 in einem gegenüber der Fig. 2 vergrößerten Maßstab,

Fig. 4

eine Schnittansicht entsprechend der Schnittverlaufslinie IV-IV in Fig. 3 in einem gegenüber der Fig. 3 verkleinerten Maßstab,

Fig. 5

eine aufgebrochene Seitenansicht des am Blockstückadapter gemäß Fig. 2 montierten Blockstücks gemäß Fig. 2 in einem gegenüber der Fig. 2 vergrößerten Maßstab,

Fig. 6

eine Unteransicht des in Fig. 5 gezeigten Blockstücks in einem gegenüber der Fig. 5 etwas vergrößerten Maßstab,

Fig. 7

eine Schnittansicht des Blockstücks entsprechend der Schnittverlaufslinie VII-VII in Fig. 6 in einem gegenüber der Fig. 6 etwas vergrößerten Maßstab,

Fig. 8

eine Draufsicht auf den in Fig. 5 gezeigten Blockstückadapter in einem gegenüber der Fig. 5 etwas vergrößerten Maßstab,

Fig. 9

eine Schnittansicht des Blockstückadapters entsprechend der Schnittverlaufslinie IX-IX in Fig. 8, die in der Zeichnungsebene um 90° im Uhrzeigersinn gedreht wurde,

Fig. 10

eine Draufsicht auf den Klebefolienabschnitt gemäß Fig. 1 in einem gegenüber der Fig. 1 vergrößerten Maßstab und

Fig. 11

eine schematische abgebrochene Querschnittsansicht des Klebefolienabschnitts gemäß Fig. 10 in einem stark vergrößerten Maßstab.

The invention is explained in more detail below with the aid of a preferred exemplary embodiment with reference to the attached, partially schematic drawing. In it show:

Fig. 1

a perspective exploded view of an arrangement according to the invention for blocking and tensioning a spectacle lens to be machined at the edge, the block piece adapter mounted on a schematically illustrated lower holding shaft, a block piece, an adhesive film section, the spectacle lens and a clamping assembly mounted on a schematically illustrated upper holding shaft shows,

Fig. 2

2 shows a sectional view of the arrangement shown in FIG. 1 in the functional position,

Fig. 3

2 shows a sectional view of the clamping assembly according to FIG. 2 on an enlarged scale compared to FIG. 2,

Fig. 4

3 shows a sectional view corresponding to the section line IV-IV in FIG. 3 on a smaller scale than in FIG. 3,

Fig. 5

3 shows a broken side view of the block piece according to FIG. 2 mounted on the block piece adapter according to FIG. 2 on an enlarged scale compared to FIG. 2,

Fig. 6

5 is a bottom view of the block piece shown in FIG. 5 on a somewhat enlarged scale compared to FIG. 5,

Fig. 7

6 shows a sectional view of the block section along the section line VII-VII in FIG. 6 on a somewhat enlarged scale compared to FIG. 6,

Fig. 8

5 shows a plan view of the block piece adapter shown in FIG. 5 on a somewhat enlarged scale compared to FIG. 5,

Fig. 9

6 shows a sectional view of the block piece adapter corresponding to the section line IX-IX in FIG. 8, which was rotated 90 ° clockwise in the plane of the drawing,

Fig. 10

a plan view of the adhesive film section of FIG. 1 in an enlarged scale compared to FIG. 1 and

Fig. 11

is a schematic broken cross-sectional view of the adhesive film section according to FIG. 10 in a greatly enlarged scale.

As can be seen from Figures 1 and 2, are on the arrangement for blocking and clamping an eyeglass lens to be machined on the edge L two rotatably mounted (storage not shown) Holding shafts 10 and 12 in the preferred vertical Functional and processing position provided between them connected and still to be described modules and elements the spectacle lens L is arranged. Here is to ensure that a slipping of the between the Holding shafts 10 and 12 clamped glasses L at the Edge processing is reliably avoided. Such one Slipping may e.g. under no circumstances occur if that too processing eyeglass lens with respect to the optical axis angularly aligned near part or a cylindrical or prismatic cut, the axial position in one predetermined for the position of the spectacle lens mounted in the spectacle frame Relationship must be.

The lower support shaft 12 is rigid, non-rotatable and coaxial with a block adapter 18 connected to which will be described later Way to take a rotationally oriented on the block piece adapter 18 detachably attached block piece 14 is formed. The block piece 14 is detachable on one Page 16 of the optical lens attachable. On the upper support shaft 10 is a clamping assembly 20 coaxially attached, the a fastening section which can be rigidly connected to the holding shaft 10 22 and an associated clamping section 24 having. The clamping section 24 is for non-positive attack formed on the other side 26 of the optical lens L.

The clamping assembly 20, the details of which in particular from Figures 3 and 4 clearly show one on opposite Pages each provided with a projection 28 Ball head 30. This is received in a receiving section 32 and rests on a truncated cone-shaped bottom Ball bearing surface 33 from. This can also be used as a spherical jacket section be shaped. The receiving section 32 is on opposite Sides with parallel to the axis of rotation D. Provide grooves 34 which are essentially free of rotational play Guide the projections 28 serve. The clamping section 24 is with respect to the fastening portion 22 by a perpendicular to Axis of rotation D of the ball head 30 standing and coaxial through the Projections 28 extending first tilt axis A and around one Rotation axis of the ball head 30 and perpendicular to the first tilt axis A. standing second tilt axis B gimbally pivotable.

The torque introduced via the holding shaft 10 becomes over the projections 28 from the mounting portion 22 to the Transfer clamping section 24.

The projections 28 provided on the ball head 30 are through a pin 36 formed through a through hole 38 extends through the ball head 30. Each of the two on the ball head 30 provided projections 28 has one of the Through hole 38 projecting cylindrical surface area 40 on. The grooves 34 in the receiving section 32 each have two opposite flat guide surfaces 42 that are parallel mutually extending the essentially play-free leadership of the cylindrical surface areas 40 of the projections 28 serve. This guide goes around the second tilt axis when swiveling B within the limits of the expected swiveling movements not lost.

Each of the projections 28 provided on the ball head 30 has an end region 44, which is formed in the shape of a spherical cap is. As is apparent from Fig. 4, the groove bottom 46 has everyone of the two grooves 34 provided in the receiving section 32 in Cross section looks at the spherical end region 44 of the associated projection 28 complementary shape. The end regions 44 of the projections 28 have a spherical radius, which is identical to the radius of the cross section of the pin 36 is, i.e. the end regions 44 close with inclusion of the cylindrical surface areas 40 continuously to the pin 36 on.

Deviating from the preferred training drawn the grooves 34 also have a rectangular cross section, wherein the groove width is only slightly larger than the diameter of the cylindrical surface areas 40 of the Projections 28. In this case, the groove side walls form the Guide surfaces 42. The spherical radii of the end regions must also 44 not with the radius of the cylindrical surface areas 40 or the radius of the cross section of the pin 36 match, but can be larger than this. Here is just ensure the length of the pin 36 over the End areas measured to be less than a movement play the distance between the groove bases of the rectangular grooves. The sphere radius but the end areas 44 should be smaller than that half pin length.

The pin 36 has a cylindrical surface area 40 of the cylindrical base body 48 forming the projections 28. This is on both sides with the spherical cap End regions 44 provided. The pin 36 has a length of around a play is smaller than the diametrically measured one Distance of the groove bases 46. The pin 36 can be moved axially be received in the through hole 38 in the ball head 30.

The receiving section 32 for the ball head 30 is on the clamping section 24 of the clamping assembly 20 is provided. The ball head 30 is, as best seen in Fig. 3, in the receiving section 32 by means of a two-part gripping behind the ball head 30 Circlip 50 held. The two-part locking ring 50 rests on an annular shoulder interrupted by the grooves 34 51 one the ball head 30 in its lower region 53 narrow but with movement play surrounding step bore 35 in Receiving section 32 (Fig. 4). The two-part locking ring 50 is in turn held by a snap ring 55, which in an annular groove 57 of the stepped bore 35 engages. In the shown Arrangement, the ball head 30 is part of the fastening section 22 and thus formed in one piece.

The fastening section 22 of the clamping assembly 20 has one Latching device 52, by means of which the clamping assembly 20 is releasably latched to the corresponding holding shaft 10 (Fig. 2, 3). In the example shown is the locking device 52 a transversely into a bore 90 of the fastening section 22 inserted cylinder sleeve 92, from which captive on both sides Locking balls 94 protrude through a spring arrangement (not shown) diverging within the cylinder sleeve 92 are acted upon. The locking balls 94 are above the Outer periphery of the cylindrical fastening section 22 out so that they have a locking groove 96 inside a blind bore 98 receiving the fastening section 22 the holding shaft 10 can be locked (Fig. 2).

The fastening section 22 of the clamping assembly 20 is at the end provided with a groove 54, in which for positive A cross pin 100 engages in rotary driving through the holding shaft 10, which is inserted into a transverse bore of the holding shaft 10 is. This cross hole penetrates diametrically opposite, wall areas of the holding shaft delimiting the blind bore 98 10. Rotations of the support shaft 10 are thus on the cross pin 100 transferred to the mounting portion 22 and from this via the engagement of the projections 28 with the grooves 34 on the clamping section 24.

The clamping section 24 instructs for non-positive attack of the optical lens L has a covering 56 which is shown in the drawing Example is annular. It consists of an im Ratio to the material of the optical lens L soft material, like leather or synthetic leather. The surface can be covered with the lower one Surface of the clamping portion 24 may be connected by gluing. If an injection moldable polymeric material for the covering 56th is used, it can also have protrusions on its top or the like. for positive engagement with the corresponding Depressions or the like the lower surface of the clamping section 24 may be formed (not shown). Essential is that the coating is a good one compared to the optical lens Has adhesion to the transmission of torque and that the covering no damage to the lens surface or thin layers, such as anti-reflective coatings, can cause.

A groove ring seal 102 in the form of an O-ring ensures a Seal between the mounting portion 22 and the support shaft 10. It seals these elements in the lower area of the Blind bore 98 against each other. As in Fig. 2 in dash-dotted lines Lines are indicated, the holding shaft 10 and the clamping section 24 by a tubular or tubular flexible cuff 104 may be connected together. This cuff hinders gimbal movements because of its flexibility of the clamping section 24 with respect to the holding shaft 10 not, but effectively seals the receiving portion 32 the penetration of contaminants such as grinding dust. The cuff also has 104, especially when it is off Rubber or an elastomeric plastic, the tendency to assume their elongated hollow cylindrical position, which makes them on the clamping section 24 before attacking the optical lens L. has a pre-centering effect.

For a more detailed explanation of the block piece 14, the block piece adapter 18 and their mutual association and their Connection to the lower support shaft 12 is now on the Figures 1 and 2 in connection with Figures 5 to 9 reference taken.

For the positive rotational driving of the block piece 14 through the block adapter 18 each have these parts in the example serrated rotary drive elements, which are described in more detail below to be discribed. Furthermore, block piece 14 and block piece adapter have 18 each also described in more detail below Positioning elements, which have the task Block piece 14 and block piece adapter 18 before engagement of the rotary driving elements to orientate relative to each other with the correct angle of rotation or to position.

The positioning elements consist of several asymmetrical ones arranged projections 58 and several complementarily assigned correspondingly asymmetrically arranged cutouts 62. The projections 58 can either on the block piece 14 or on Block adapter 18 may be arranged. The same applies to the recesses 62, i.e. if the projections 58 am Block piece 14 are located, the recesses 62 on the block piece adapter 18 arranged. The projections, however, are 58 on the block adapter 18, the recesses 62 arranged on the block piece 14. Preferably and as drawn the projections 58 are formed on the block adapter 18, while the recesses 62 are provided on the block piece 14.

The end faces 60 of the projections 58 lie in one to the Axis of rotation D perpendicular common plane (Fig. 8, 9). The Recesses 62 go from a perpendicular to the axis of rotation D. flat surface 64 from (Fig. 5, 6, 7). Here is the arrangement so that the axial distance a (Fig. 7) between the rotary driving elements and the positioning elements, i.e. the flat surface 64 from which the recesses going out, different, i.e. is larger than on the block adapter 18 the axial distance b (Fig. 9) between the rotary driving elements and the positioning elements, i.e. the common Plane of the end face 60 of the projections 58.

Because of these conditions, the block piece 14 can be opened the manner specified below with the block adapter 18 to the desired correct angle shown in FIG. 5 Combine the intervention situation. The block piece 14 is axially open moved the block adapter 18, so do not come against rotation angle orientation of block piece and block piece adapter first the projections 58 with their end faces 60 Attachment to the flat surface 64. Now it is brought about the only correct rotation angle orientation the block piece 14 rotated relative to the block adapter 18, the end faces 60 slide on the flat surface 64 without doing so the block piece 14 opposite the block piece adapter 18 a Tilting movement, which undesirably the rotary driving elements could partially engage. by virtue of the matching asymmetrical arrangement of the projections 28 and the recesses 62 is only a correct angle of rotation orientation possible. If the correct relative rotation angle orientation between block piece 14 and block piece adapter 18 is reached, the projections occur with further axial approach 58 into the recesses 62, whereupon the mutually toothed rotary driving elements with each other in get the engagement shown in Fig. 5, so that torques can be transferred from the holding shaft 12 to the block piece 14 are. Incidentally, in such arrangements, the two Holding shafts 10 and 12 driven synchronously at the same speed.

To achieve the temporary tilt-proof contact of the end faces 60 on the flat surface 64 form the in the embodiment provided three projections 58 and of course the Recesses 62 are the corner points of a triangle. However, it is ensure that it is not an equilateral Triangle acts when its corner points from the axis of rotation are the same Radial spacing because doing so is undesirable three different angles of rotation offset by 120 ° Intervention positions would be possible. The tabs and the recesses should be arranged asymmetrically from the Have different radial distances.

To facilitate the insertion of the protrusions 58 into the recesses 62 have the projections 58 starting from theirs End faces 60 and / or the recesses 62 starting from the flat surface 64 chamfers 66. Chamfer at the entry openings the cutouts 62 are not shown in the drawings.

The block piece 14, as can best be seen from FIG. 7, a hub portion 68 on which the positioning elements are provided are, i.e. the recesses emanating from the flat surface 62nd

One is elastically connected to the hub section 68 concentric ring section 70, the toothed rotary driving elements wearing. The elastic connection between the Hub section 68 and the ring section 70 take over in the drawn Example (Fig. 6) four evenly distributed around the circumference Web 72, both with the ring portion 70 and are integrally connected to the hub portion 68. This One-piece construction can be easily achieved if the block piece 14 overall made of a flexible thermoplastic PU base (e.g. Elastollan) is injection molded. Instead of Web 72 can also between the hub portion 68 and the Ring section 70 a thin-walled elastic peripheral connecting wall be provided (not shown). This then takes the place of the existing between the webs 72 Gaps 73.

As can be seen in particular from FIGS. 6, 7 and 8, 9, are the rotary driving elements on the block piece 14 and on the block piece adapter 18 by complementary ring gears 74 or 76 trained. These ring gears 74 and 76 are light arranged conically, namely on the block piece 14 convex-conical and on the block adapter 18 concave-conical. In this way unfold the ring gears 74 and 76 when engaged Centering effect with respect to the common axis of Block piece 14 and block piece adapter 18.

The block adapter 18 has a sleeve-shaped rotationally symmetrical made of metal, e.g. Brass, manufactured body 106 with a central receiving bore 108 for the shaft end 110 correspondingly adapted in diameter (FIG. 2) the holding shaft 12 is provided. The non-rotatable and correct angle Connection of the body 106 to the shaft end 110 takes over a cross pin 112 which in a transverse bore 114 of the Shaft end 110 and at the same time in a take-out recess 116 of the body 106 engages. The take-out recess 116 is the Cross pin 112 adjusted so closely that the body 106 after Attachment of cross pin 112 not opposite the support shaft 12 can twist. It is just a take-out recess 116 provided so that the block adapter 18 only in one Angular position are attached to the support shaft 12 can.

Is attached to the body 106, for example injection molded an externally conically shaped receiving element 118 for the block piece 14. The receiving element 118 is made of a hard thermoplastic Molded plastic, for example made of polyoxymethylene (POM), and has a cylindrical mounting hole 120 for the hub portion 68 of the block piece 14. The upper one Edge of the receiving element 118 is to form the ring toothing 76 shaped. The receiving bore 120 ends at a vertical to the axis of rotation D oriented inner surface 122, of which protrusions 58 run out.

The block piece 14 is equipped with an adhesive on both sides Adhesive film section 78 on the optical lens L mountable. The adhesive film section 78 serves for blocking the lens L by means of the block piece 14 and is located behind the blocking and tensioning between the block piece 14 and the Lens L, as shown in Figures 1 and 2. The peculiarity of the adhesive film section 78 is that on his side 80 facing the block piece 14 applied adhesive has a higher adhesive force than that of the lens L facing side 82 applied adhesive (Fig. 11), whereby an undesirable stronger adhesion to the optical lens L is avoided.

The adhesive film section 78 shown in FIG. 10, which approximately a circular outer contour with an approximately the outer diameter corresponding to the ring section 70 of the block piece 14 Has a diameter that is easy to remove Provide tab 84, at least on the lens L facing Page is non-adhesive, so that it is not can adhere to the lens L.

Due to the elasticity of the contact surface facing the lens L. 86 (Fig. 1, 7) of the block piece 14, the adhesive film section 78 a very small thickness between about 0.025 and 0.2 mm because the adhesive film section because of the mentioned Elasticity of the block piece 14 no tasks regarding an adaptation to e.g. curved surface of the Lens L has to perceive. The transmitted torque can Do not deform or flex the very thin section of adhesive film.

An arrangement for blocking and tensioning is proposed lenses to be processed on the edge, in particular spectacle lenses, which improves in handling and which in the sense of a practical optimized play-free rotation of the optical lens is. For this, the are arranged between the two holding shafts Elements, especially the clamping assembly, the block piece with the block adapter and the adhesive connection between Block piece and optical lens designed in a special way.

LIST OF REFERENCE NUMBERS

10

holding shaft

12

holding shaft

14

block piece

16

one side of the optical lens

18

Block piece Adapter

20

tension assembly

22

attachment section

24

clamping section

26

the other side of the optical lens

28

head Start

30

ball head

32

receiving portion

33

Ball bearing surface

34

groove

35

stepped bore

36

pen

38

Through Hole

40

area

42

guide surface

44

end

46

groove base

48

body

50

circlip

51

annular shoulder

52

locking device

53

lower area of the stepped bore 35

54

groove

55

snap ring

56

covering

57

ring groove

58

head Start

60

face

62

recess

64

flat surface

66

chamfer

68

hub portion

70

ring section

72

web

73

gap

74

ring gear

76

ring gear

78

Adhesive film section

80

side facing the block piece

82

side facing the lens

84

flap

86

bearing surface

90

drilling

92

cylinder sleeve

94

detent ball

96

locking groove

98

blind hole

100

cross pin

102

groove ring seal

104

cuff

106

body

108

location hole

110

shaft end

112

cross pin

114

cross hole

116

driving cutout

118

receiving element

120

location hole

122

Inner surface

a

axial distance

b

axial distance

A

first tilt axis

B

second tilt axis

D

axis of rotation

L

optical lens

Claims (23)

Arrangement for blocking and clamping optical lenses (L) to be machined on the edge, in particular spectacle lenses, between two rotatable holding shafts (10, 12)
a block piece (14) which can be detachably attached to one side (16) of the optical lens (L),
an adapter (18) for the block piece (14) which can be rigidly connected to one of the holding shafts (12) and which is designed for rotationally oriented rotational driving of the block piece (14), and
a clamping assembly (20) which has a fastening section (22) rigidly connectable to the other holding shaft (10) and a clamping section (24) connected thereto, which is designed for non-positive engagement with the other side (26) of the optical lens (L) .
characterized in that the tensioning assembly (20) has a spherical head (30) provided on opposite sides with a projection (28) each, which is received in a receiving section (32) which on opposite sides parallel to the axis of rotation (D) of the receiving section (32) extending grooves (34) are provided, which are used to guide the projections (28) essentially without rotational play, for which purpose a groove base (46) of each of the grooves (34) in cross section leads to an end region (44) of the associated projection (28 ) has a complementary shape, the tensioning section (24) with respect to the fastening section (22) about a first tilting axis (A) which is perpendicular to the axis of rotation (D) of the ball head (30) and extends through the projections (28) and about a axis of rotation ( D) of the ball head (30) and the second tilt axis (B) perpendicular to the first tilt axis (A) can be pivoted, while a torque from the fastening section (22) is applied via the projections (28) the clamping section (24) is transferable. Arrangement according to claim 1, wherein the on the ball head (30) projections (28) provided by a pin (36) are through a through hole (38) in the ball head (30) extends through. Arrangement according to claim 1 or 2, wherein each on the ball head (30) provided projection (28) a cylindrical surface area (40). The assembly of claim 3, wherein the grooves (34) in the receiving section (32) each have two flat guide surfaces (42) have, which run parallel to each other essentially play-free guidance of the cylindrical surface areas (40) of the projections (28) provided on the ball head (30). Arrangement according to one of the preceding claims, wherein the end regions (44) of the projections provided on the ball head (30) (28) are formed in the shape of a spherical cap. Arrangement according to claims 2 to 5, wherein the pin (36) one of the cylindrical surface areas (40) of the projections (28) forming cylindrical base body (48), that on both sides with the spherical spherical end regions (44) is provided. Arrangement according to one of claims 2 to 6, wherein the Pin (36) has a length that is substantially the distance corresponds to the groove bases (46). Arrangement according to one of claims 2 to 7, wherein the Pin (36) axially displaceable in the through hole (38) Ball head (30) is added. Arrangement according to one of the preceding claims, wherein the ball head (30) in the receiving section (32) by means of a Ball head (30) engaging two-part locking ring (50) is held. Arrangement according to one of the preceding claims, wherein the ball head (30) is part of the fastening section (22) the clamping assembly (20) is during the receiving section (32) for the ball head (30) on the clamping section (24) of the clamping assembly (20) is provided. Arrangement according to one of the preceding claims, wherein the fastening section (22) of the clamping assembly (20) Has locking device (52) by means of which the clamping assembly (20) releasably latched to the corresponding holding shaft (10) is. Arrangement according to one of the preceding claims, wherein the fastening section (22) of the clamping assembly (20) at the end with a groove (54) for positive rotation the corresponding holding shaft (10) is provided. Arrangement according to one of the preceding claims, wherein the clamping section (24) for non-positive attack on the optical lens (L) has a covering (56) which consists of a softer in relation to the material of the optical lens (L) Material such as leather or synthetic leather. Arrangement according to one of the preceding claims or the preamble of patent claim 1,
wherein the block piece (14) and the block piece adapter (18) each have rotary driving elements for the positive rotational driving of the block piece (14) by the block piece adapter (18) and positioning elements for the rotational angle orientation of the block piece (14) with respect to the block piece adapter (18),
wherein the positioning elements on the block piece (14) or on the block piece adapter (18) are formed by several asymmetrically arranged projections (58), the end faces (60) of which lie in a common plane perpendicular to the axis of rotation (D), while the positioning elements on the block piece adapter (18) or on the block piece (14) as recesses (62) complementarily assigned to the projections (58), which emanate from a flat surface (64) perpendicular to the axis of rotation (D), and
the axial distance (a) between the rotary driving elements and the positioning elements on the block piece (14) being different from the axial distance (b) between the rotating driving elements and the positioning elements on the block piece adapter (18), so that when the block piece (14) is moved axially towards one another and block piece adapter (18) if the rotation angle orientation has not yet been given, the projections (58) come to rest on the flat surface (64) and then, after the rotation angle orientation has taken place, the projections (58) enter the recesses (62), whereupon the rotary driving elements come together engage. Arrangement according to claim 14, wherein three projections (58) are provided, the end faces (60) of the corner points of a Form a triangle. Arrangement according to claim 14 or 15, wherein the projections (58) starting from their end faces (60) and / or the recesses (62) starting from the flat surface (64) chamfers (66) exhibit. Arrangement according to one of claims 14 to 16, wherein the Projections (58) are formed on the block adapter (18), while the recesses (62) are provided on the block piece (14) are. Arrangement according to one of claims 14 to 17, wherein the Block piece (14) has a hub portion (68) on which the positioning elements are provided, and one with the hub portion (68) has elastically connected ring section (70), who carries the rotary driving elements. The assembly of claim 18, wherein the hub portion (68) over a plurality of webs evenly distributed around the circumference (72) preferably connected in one piece to the ring section (70) is. Arrangement according to one of claims 14 to 19, wherein the Rotary driving elements on the block piece (14) and on the block piece adapter (18) formed by complementary ring teeth (74, 76) are. Arrangement according to one of the preceding claims or the preamble of claim 1, wherein the block piece (14) by means of a double-sided adhesive film section (78) can be attached to the optical lens (L) on its the block piece (14) facing side (80) has a higher adhesive force has as on its facing the optical lens (L) Page (82). 22. The assembly of claim 21, wherein the adhesive sheet portion (78) is provided with a tab (84) that at least on its side facing the optical lens (L) is non-adhesive. Arrangement according to claim 21 or 22, wherein the adhesive film section (78) has a thickness between 0.025 and 0.2 mm.

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