FR2939914A1 - Optical glasses drilling device for spectacles, has drilling unit including multiple heads equipped with drilling tool and milling tool, where tools realize circular cross drilling and lateral notch emerging into edge area of glass - Google Patents

Abstract

The device (10) has a horizontal plate (11) on which a glass support (12) is assembled to maintain glass in a horizontal position. The support moves the glass on the plate in two co-ordinate directions (X, Y). A drilling unit (14) is overhung above the plate and moved in translation along a vertical axis (Z). The drilling unit includes multiple heads (15) equipped with a drilling tool (16) and a milling tool (17). The tools simultaneously realize circular cross drilling and lateral notch emerging into an edge area of the glass, during the descent of the drilling unit towards the glass.

Description

The present invention relates to the drilling of optical glasses for the production of glasses called drilled glasses and without surrounding frame. BACKGROUND OF THE INVENTION There have long been wired frame structures on which eyeglass lenses are fixed by bolting systems, the lenses being then not surrounded by the frame. According to one of the existing systems, and already widely distributed, each eyeglass lens has two through holes in the vicinity of opposite edges, also noted nasal edge and temporal edge, one of which (nasal edge) serves to fix one end of the bridge , and the other (temporal edge) an end of a wired assembly with articulated branches. However, it is advisable to provide an anti-rotation means for these frame members, and among the various possible solutions, it is very common to use systems with lateral notch opening into which is inserted a terminal portion returned from the element of mount.

Thus, it is a matter of producing, on each spectacle lens, and in the vicinity of two opposite edges of said lens, an open slot and an adjacent through hole. For the state of the art, reference can be made to JP-A-8 155 945 which discloses an optical lens piercing unit for making two through-holes in the vicinity of opposite edges of each spectacle lens. This document describes a very complex and high cost structure machining assembly. JP-A-8155806 also discloses an oscillating glass holder drilling assembly. For the drilling of particular holes in optical glasses, reference may also be made to the document WO-A-00/68729 describing a drilling assembly intended to make oblong through-holes, and to the document WO-A-99/37449 describing a drilling assembly adapted to the machining of blind holes made in the thickness of the glass. The drilling assemblies described in the aforementioned documents, however, are sophisticated and high cost.

Reference may also be made to document FR-A-2,800,172 describing a process for drilling optical glasses using computer assistance to associate drilling planes with a given virtual glass template. We can also mention, under the technological background, documents EP-A-0 739 683, WO-A-00/67 974 and EP-A-0 421 945. Finally, reference may also be made to document FR-A-2. 826 599 of the applicant which describes a drilling device with turntable, to achieve successively, with the same drilling tool, first a notch opening, and then a through hole. The aforementioned drilling devices are generally complicated in structure, and poorly adapted for use by an optician wishing to drill holes in his store, with maximum precision and flexibility of use, and a minimum of space . OBJECT OF THE INVENTION The object of the invention is to design a device for drilling optical glasses that avoids the aforementioned drawbacks, while being of simple structure and easy to handle. GENERAL DEFINITION OF THE INVENTION The technical problem mentioned above is solved according to the invention by means of optical glass piercing device for the realization of glasses called pierced glasses and without surrounding frame, which comprises: - a horizontal plate on which is mounted a glass holder arranged to hold a glass in a substantially horizontal position, said glass holder for moving said glass horizontally on the platen in two coordinate directions and for immobilizing said glass in position relative to said platen; and a drilling unit arranged overhanging above the plate being displaceable in translation along a vertical axis, said drilling unit comprising a multiple head equipped at the very least with a drilling tool and a tool for drilling; milling both rotated by an associated motor, said drilling and milling tools to achieve simultaneously, during the descent of the piercing unit to the glass, respectively a circular piercing through and a side notch opening in the area concerned edge of said glass.

Thus, in a single pass, the operator simultaneously performs a piercing through and a notch opening in the nasal or temporal border of the optical glass. The rigid attachment of the drilling and milling tools ensures a perfect relative positioning of the drilling and the notch relative to each other. Preferably, the drilling unit has below a reference lateral projection against which the glass can be positioned, at a point of tangency thereof previously identified and immobilized, before being pierced by the tools of drilling and milling the multiple head. Such a reference system ensures perfect positioning of the bore and the notch relative to the periphery of the glass, and this directly for the person who is intended to wear the glasses equipped with these pierced lenses. Advantageously, the drilling tool is a vertical axis drill, and the milling tool is a disc mounted to rotate about a horizontal axis. In particular, the horizontal axis of the milling tool is shifted downward relative to the free edge of the drilling tool, so as to perform at least part of the milling of the notch opening before performing the piercing through. More preferably, the reference side projection is in the vertical plane of the milling disc, below said milling disc. This ensures the best precision for milling. According to another particularly advantageous characteristic, the device of the invention comprises a double lens support for positioning two glasses next to each other, and the multiple head of the piercing unit is equipped with a plurality of drilling and milling tools driven in rotation by an associated motor to achieve simultaneously, during the descent of the drilling unit 15 to the glasses, respectively a circular piercing through and a lateral notch opening in the area relevant edge of each of said glasses. Thus, it becomes possible to simultaneously perform, in one pass, two holes and two lateral notches 20 for the two juxtaposed glasses. Preferably then, the multiple head is equipped with a single milling tool in the form of a disk mounted for rotation about a horizontal axis, and two separate drilling tools in the form of vertical axis drills. , arranged on either side of said single milling tool, which single milling tool makes it possible to simultaneously perform the lateral notch opening of each of the two glasses. Advantageously, the drilling unit has, on either side of a vertical plane passing through the horizontal axis of the milling disc, a reference lateral projection against which each lens can be positioned and immobilized. It is also advantageous to provide that the glass support (s) comprises at least one jumper equipped with a glass clamp, and an associated lateral slide, on which said jumper can slide in a lateral direction and is immobilisable in position relative to said slide. Advantageously then, the or each jumper can be turned 180 ° in order to successively pierce the nasal edge zone and the temporal edge zone of the glass which is fixed on said rider, without having to disassemble said rider's glass, and the or each associated slide is adjustable in inclination, so as to allow adaptation to different glass curvatures. It will then be possible for the or each slide to be mounted on the plate while being able to slide in a horizontal direction parallel to a coordinate axis, or alternatively in two horizontal orthogonal directions parallel to the two coordinate axes, then by means of superposed plates. . According to another advantageous characteristic, the drilling and milling tools are rotated by a common drive which is carried by the drilling unit. In particular, the common motor comprises an electric motor and a tool connecting belt between them. Preferably, finally, the drilling unit is equipped with a locking member for locking said drilling unit in any vertical position, in particular to facilitate contacting the lens or glasses against the associated reference side projection. Other features and advantages of the invention will appear more clearly in the light of the description which follows and the accompanying drawings relating to a particular embodiment. BRIEF DESCRIPTION OF THE DRAWINGS Reference will be made to the figures of the drawings in which: FIG. 1 illustrates in perspective a drilling device according to the invention, here adapted to work simultaneously on two juxtaposed glasses, as it is presented once. glasses put in place before drilling them; - Figure 2 is a perspective view of the drilling unit fitted to the aforementioned device; FIG. 3 is a section on III-III of FIG. 2, and FIG. 4 is a section on IV-IV of FIG. 3; FIG. 5 schematically illustrates the preliminary positioning of a glass before drilling it, in a step a), then the realization in a single pass of a through-hole and an emergent notch, in a step b ). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIG. 1 illustrates a device for drilling optical glasses for producing glasses said to have drilled lenses and without surrounding frames, this device being referenced generally 10. The device 10 comprises a horizontal plate 11 on which stands A vertical column 13. At the center O of the column, a reference trihedron is thus defined with X, Y, Z coordinate axes. The column 13 carries a piercing unit denoted 14, which is arranged in overhanging position. above the plate 11, being displaceable in translation along the vertical axis Z, as shown schematically by the double arrow 100. The drilling unit 14 comprises a multiple head 15 which is equipped at least with a drilling tool 16 and a milling tool 17 both rotated by an associated actuator 18. A lever 21 allows the operator to lower or raise the piercing unit 14, and therefore the drilling tools 16 and milling 17 which are rotated by the motor 18. Another lever 22, here disposed on the opposite side of the drilling unit 14, locks the drilling unit 14 7 in any vertical position, in particular to facilitate the positioning of the glass to be drilled, as will be described in more detail below. The horizontal plate 11 carries a glass holder 12 which is arranged to hold at least one glass V in a substantially horizontal position, said glass holder allowing said glass to be moved horizontally on the plate 11 in two directions of coordinates X, Y, and immobilizing said glass in position relative to said platen. In this case, the glass support is double, that is to say, it is arranged to support two juxtaposed glasses to achieve a simultaneous drilling of the edges opposite these two glasses. Of course, the invention is not limited to this particularly rational possibility, and the piercing device can very well be arranged to work on the edge of a single glass. The support 12 comprises in this case an assembly 31 T-shaped, arranged to slide in a groove 32 of the plate 11, in the direction of X coordinates. The locking in position on this axis is achieved by a clamping wheel 33 The aforementioned sliding is shown schematically by a double arrow 102. With regard to the transverse direction, parallel to the Y coordinate axis, it can be seen that the lens support 12 also comprises at least one jumper 35 which is mounted to slide in an associated lateral slideway 34, the sliding of each jumper being shown schematically by a double arrow 103. In this case, to the extent that it is desired to be able to perform a simultaneous work of two glasses V, two such jumpers 35 are used, whose respective position on the associated lateral slideway 34 can be fixed at any point of the slideway by an associated clamping wheel 36. Each rider 35 carries an inferior support member ur 38 and an upper clamping member 37, which constitute a clamp 8 of a glass V. In practice, each glass to drill V is equipped with a suction cup which allowed to machine the peripheral contour with precision with respect to the optical axis of said glass. Therefore, the clamp 37, 38 is arranged to be able to clamp the glass via this suction cup. Once the one or more glasses to be pierced V placed on their respective rider 35, and clamped on it, the operator moves the movable elements of the support, namely the element T and the rider (s) 35 so to bring the glass or glasses to be drilled V in the piercing zone, that is to say above the tools provided for this purpose. According to an essential characteristic of the invention, the drilling unit 14 comprises a multiple head 15 equipped at the very least with a drilling tool 16 and a milling tool 17 both driven by an associated motorisation device 18, said drilling and milling tools making it possible simultaneously to produce, when the drilling unit 14 is lowered to the glass V, a circular through-hole and a lateral notch opening in the relevant edge zone of said glass. In this case, the drilling tool 16 is a vertical axis drill Z1, and the milling tool 17 is a disc mounted to rotate about a horizontal axis X1. Thus, the simple lowering of the drilling unit 14 makes it possible to bring the two drilling and milling tools 16, 17 to the edge zone of the glass, and thus to perform the desired machining work, in order to to obtain, in a single pass, a circular piercing through and an emergent lateral notch. The relative positioning of the through bore and the lateral notch opening relative to each other is guaranteed by the rigid mounting of the drilling and milling tools 16, 17 associated with the drilling unit 14. however to be able to position with precision the glass V before drilling the latter.

For this purpose, in the context of the invention, there is provided a reference lateral projection against which the glass V can be positioned and immobilized, before being pierced by the drilling tools 16 and milling 17 of the multiple head. 15.

The drilling unit 14 here comprises a lower portion 50 on which a milling disc 17 is mounted, and this portion 50 is terminated inferiorly by a plate 19 having laterally the reference lateral projection referred to above 20. In this case, as it is planned to be able to perform a drilling simultaneously on two glasses positioned next to each other, there is of course provided on the plate 19 a lateral reference projection 20 on each side, here symmetrically of on either side of a vertical plane passing through the horizontal axis X1 of the milling disc 17. It should be noted that each reference lateral projection 20 is located below the milling disc 17. This is important in the when the first step of lowering the piercing unit 14 is started by making a precise approach to the lens or lenses to be pierced by means of the corresponding reference lateral projection 20, before proceed, with the further descent of the piercing unit 14, the realization of holes and nicks themselves.

The aforementioned structural features will emerge more clearly from the views of FIGS. 2 to 4, which clearly show the arrangement of the components which have just been described. One could have predicted, for piercing simultaneously two juxtaposed glasses, a total duplication of drilling and milling tools, with a milling and drilling tool for each individual glass. We would have had then a multiple head equipped with two drilling tools and two milling tools.

In this case, a more elegant solution has been provided, with a multi-head 15 equipped with a single milling tool 17 in the form of a disc mounted to rotate about a horizontal axis X1, and two tools of separate drilling 16 in the form of vertical axis drills Z1, Z2, arranged on either side of said single milling tool, which single milling tool 17 then makes it possible to simultaneously achieve the opening lateral notch of each of the two glasses V. Figures 2 to 4 make it possible to better distinguish the assembly of the tools 16 and 17 currently used. Each drill 16 is mounted on an associated mandrel 23 of vertical axis respectively Z1, Z2. Each mandrel 23 is coupled in rotation to an upper pulley 24, and these two pulleys 24 are coupled to a central pulley 25 by a toothed belt 26, the latter pulley 25, of vertical axis Z3, itself being rotated by a hub 27 which is engaged with the output shaft of a common drive electric motor 18. The aforementioned pulley 25 is here rotatably coupled to a vertical shaft 27.1 which terminates in a ferrule 28 serving to drive by friction , through an O-ring 30, another endpiece 29 integral in rotation with the shaft 17.1 and on which is mounted the milling tool 17 horizontal axis Xl. Thus, when the electric motor 18 is engaged, the seal 30 produces a friction drive coupling which rotates the milling tool 17 about its axis X1, the two drilling tools 16 being in turn rotated through the toothed belt 26.

FIG. 5 makes it possible to clearly understand the two successive 11 steps of positioning the or each glass to be pierced, and of making the piercing and the notch in the concerned edge of said glass. In a), it is found that the glass V is positioned at a point of tangency Q thereof, previously identified, against the associated reference lateral projection 20. The optician has previously drawn a reference mark R with a marker at the center of the lateral notch to be made. Arrow 103 indicates that the concerned edge of the glass V is brought into contact with the reference lateral projection 20. This approaching of the glass is done by simultaneously acting on the displacements in the X, Y coordinate directions, the positioning of the glass being made with great precision by the descent of the piercing unit 14 to the desired height, as shown schematically by the arrow 100.1. This operation will be facilitated by using the locking member 22 which makes it possible to lock the piercing unit 14 in any vertical position. Once the or each glass V correctly positioned, it is immobilized by blocking the associated support jumper 35 on the slide concerned 34 of the support 12. The V or glasses are thus immobilized relative to the plate 11.

It suffices then, as illustrated in b), to continue the descent of the drilling unit 14, as shown by the arrow 100.2, to bring the two drilling tools 16 and milling 17 in contact with the relevant edge of the glass , in order to realize simultaneously, and in a single pass, a circular through-hole marked PT and an open lateral notch denoted ED. We are then quite certain of the good positioning of the bore and the notch through the prior registration, and only downward movement of the drilling unit in a vertical direction after the registration step.

As best seen in FIG. 3, there is provided an offset, denoted a, between the axis X1 of the milling tool 17, and the free edge 16.1 of the drilling tools 16. This offset, which does not is not mandatory, allows to initiate at least part of the milling of notches emerging in the glasses before making through holes. In this case, when the piercing tools 16 come into contact with the surface of the glass, the large diameter of the milling tool 17 has already exceeded said surface, so that the open slots are already made. This avoids excessive vibration and significant heating of the machined glass area. As can be seen in FIG. 1, each of the slides 34 is here inclined, going up towards a central vertical plane. This allows the glass to be positioned in such a way that its plane of tangency, at the level of the edge zone to be machined, is essentially horizontal. One could of course provide a more complex mounting for adjusting tilt each associated slide 34, by means of a notch or rack not shown here. Such adjustments then allow adaptation to very different glass curvatures. Likewise, although this is not shown in FIG. 1, it will be possible to provide millimeter markings for accurately assessing the displacements in the horizontal directions of coordinates X, Y, in order to reproduce glass positioning more quickly. FIG. 1 illustrates a very simple assembly, in which each slideway 34 can slide in a horizontal direction parallel to the X coordinate axis on the plate 11, as shown by the double arrow 102. variant a more complex assembly with a plurality of superimposed plates, as noted here 11.1, 11.2, 11.3, to allow sliding of each slideway 34 in two horizontal orthogonal directions parallel to the X, Y coordinate axes. organize a slide similar to slide 32 in a lower plate, this other slide then extending in the direction of coordinates Y. Finally, it will be possible to provide that each jumper 35 on which a glass to be pierced is fixed can be turned 180 ° , in order to successively pierce the nasal edge zone and the temporal edge zone of the glass V which is fixed on said rider, without having to disassemble said v wanders of his rider. Thus, the device currently illustrated allows in a first pass to achieve for example the drilling and notching of the nasal edge area of each of the two glasses, then, after recovery of the piercing unit 14, and reversal of each of riders 35, to proceed to a new positioning of the glasses using the reference projections 20, to achieve, in a single new pass, the drilling and notching of the temporal edge area of the two glasses V. It will be noted in the alternative that the device currently illustrated also makes it possible to perform superimposed holes with two through holes for each nasal or temporal edge area, without making a lateral notch opening it suffices for this to disassemble the milling tool 17, and use the or the piercing tools 16. This therefore allows easy adaptation to other types of existing frames, using two superimposed holes at the level of each nasal border and mporale. It has thus been possible to produce an optical glass piercing device whose structure is both simple and extremely easy to handle, and which enables an optician to accurately carry out piercing operations in his shop, with a minimum of 'congestion and 14 a maximum of speed. The precision of the drilling and encapsulation is also optimal. The invention is not limited to the embodiment which has just been described, but on the contrary covers any variant using, with equivalent means, the essential characteristics mentioned above.

Claims (16)

REVENDICATIONS1. Apparatus for drilling optical glasses for producing spectacles said to pierced lenses and without surrounding frame, characterized in that it comprises: - a horizontal plate (11) on which is mounted a glass support (12) arranged to maintain a glass (V) in a substantially horizontal position, said glass holder for moving said glass horizontally on the platen (11) in two coordinate directions (X, Y) and immobilizing said glass in position relative to said platen; and - a drilling unit (14) arranged overhanging above the plate (11) being displaceable in translation along a vertical axis (Z), said drilling unit comprising a multiple head (15) equipped at least a drilling tool (16) and a milling tool (17) both rotated by an associated motor (18), said drilling and milling tools making it possible to perform simultaneously, during the descent of the piercing unit (14) to the glass (V), respectively a circular through-hole (PT) and an emergent lateral slot (ED) in the respective edge region of said glass. 2. Device according to claim 1, characterized in that the drilling unit (14) has below a reference lateral projection (20) against which the glass (V) can be positioned, at a point of tangency ( Q) of the latter previously identified and immobilized, before being pierced by the drilling tools (16) and milling (17) of the multiple head (15). 3. Device according to claim 1 or claim 2, characterized in that the drilling tool (16) is a vertical axis drill (Z1), and the milling tool (17) is a disk mounted to rotate around a 16 horizontal axis (Xl). Device according to claim 3, characterized in that the horizontal axis (X1) of the milling tool (17) is offset downwards with respect to the free edge (16.1) of the drilling tool (16). , so as to perform at least part of the milling of the notch opening (ED) before performing the through drilling (PT). 5. Device according to claims 2 and 3, characterized in that the reference lateral projection (20) is in the vertical plane of the milling disc (17), below said milling disc. 6. Device according to one of claims 1 to 5, characterized in that it comprises a double glass holder (12) for positioning two glasses (V) one next to the other, and the multiple head (15) of the piercing unit (14) is equipped with a plurality of drilling (16) and milling tools (17) rotated by an associated motor (18) in order to simultaneously realize, when descent from the piercing unit (14) to the glasses (V), respectively a circular through-hole (PT) and an emergent side slot (ED) in the respective edge area of each of said glasses. 7. Device according to claim 6, characterized in that the multiple head (15) is equipped with a single milling tool (17) in the form of a disc mounted to rotate about a horizontal axis (Xl), and two separate drilling tools (16) in the form of vertical axis drills (Z1, Z2), arranged on either side of said single milling tool, which single milling tool (17) makes it possible to perform simultaneously the emergent lateral notch (ED) of each of the two glasses (V). 8. Device according to claim 7, characterized in that the drilling unit (14) has, on either side, a vertical plane passing through the horizontal axis 17 (X1) of the milling disk ( 17), a reference lateral projection (20) against which each glass (V) can be positioned and immobilized. 9. Device according to one of claims 1 to 8, characterized in that the glass support (s) (12) comprises at least one jumper (35) equipped with a clamp (37, 38) for clamping a glass (V), and an associated lateral slide (34), on which said rider can slide in a lateral direction (103) and is immobilizable in position 10 relative to said slide. 10. Device according to claim 9, characterized in that the or each rider (35) can be turned 180 ° in order to successively pierce the nasal edge area and the temporal edge area of the glass (V) which is fixed on 15 said rider, without having to disassemble said glass of his rider. 11. Device according to claim 9, characterized in that the or each associated slide (34) is adjustable in inclination, so as to allow adaptation to curvatures of different glasses. 12. Device according to claim 9 or claim 11, characterized in that the or each slide (34) is mounted on the plate (11) being slidable in a horizontal direction parallel to the axis of coordinates (X). 13. Device according to claim 9 or claim 11, characterized in that the or each slide (34) is mounted on the plate (11) being slidable in two horizontal orthogonal directions 30 parallel to the coordinate axes (X, Y). , by means of superimposed plates (11.1, 11.2, 11.3). 14. Device according to one of claims 1 to 13, characterized in that the drilling tools (16) and milling (17) are rotated by a common motor (18) which is carried by the unit of 18 holes (14). 15. Device according to claim 14, characterized in that the common motor comprises an electric motor (18) and a belt (26) connecting the tools (16, 17) between them. 16. Device according to one of claims 1 to 15, characterized in that the drilling unit (14) is equipped with a locking member (22) for locking said drilling unit in any vertical position, so in particular to facilitate contacting the one or more glasses (V) against the associated reference lateral projection (20).