EP3418000B1 - Tool holder and device for polishing lenses - Google Patents

Description

The present invention relates to a tool holder according to the preamble of claim 1 and a device according to the preamble of claim 10, each for polishing optical workpieces, in particular lenses or spectacle lenses.

The DE 10 2004 062 319 B3 and the DE 10 2014 015 052 A1 each disclose a device for polishing optical workpieces, in particular lenses, using a rotatable tool. The device has a tool drive and a tool holder. The tool holder has a tool holder that is tiltably mounted via a ball head. The tool holder holds the exchangeable polishing tool. Furthermore, the tool holder has a bellows assigned to the tool holder, which follows an axial infeed of the tool holder. Changing the bellows and ball head bearings when they are worn is difficult due to the often limited space in the work area.

The EP 1 473 116 A1 discloses a receptacle for a membrane for fine machining of optically effective surfaces on spectacle lenses. The receptacle has a base body that can be detachably attached to a tool spindle of a processing machine. The membrane is attached to the base body in a tiltable manner via an adjoining bellows. The membrane can only be replaced together with the bellows. The bellows is held on the base body via a screwed retaining ring, so replacing it is time-consuming. In order to apply processing pressure during processing of the optically effective surface, the bellows is subjected to a pressure medium.

The EP 1 698 432 A2 discloses a similar recording for the fine machining of optically effective surfaces on spectacle lenses. The receptacle has a tiltable receptacle section onto which a polishing plate can be placed. By supplying a pressure medium, the receiving section and the polishing plate can be moved axially. The polishing plate is held non-rotatably by the receiving section and is held axially between the receiving section and the surface to be processed only by the infeed.

The present invention is based on the object of specifying a tool holder for a tool drive for polishing optical workpieces and a device for polishing optical workpieces, with a very simple one Attaching and changing the tool holder is made possible, especially when there is limited space for movement or directly in a work area.

The above object is achieved by a tool holder according to claim 1 or a device according to claim 10. Advantageous further training is the subject of the subclaims.

According to one aspect of the present invention, the tool holder is designed for magnetic coupling with or magnetic mounting on an axially adjustable actuating element of the tool drive. This allows for very simple and quick assembly and disassembly, particularly without tools.

In particular, the tool holder or a tool holder or bearing part of the tool holder or a bearing part of the tool holder is magnetically coupled or held with the adjusting element - preferably in the axial direction. This allows very simple mounting and positioning, especially in the axial direction. Preferably, the tool holder is attached or attachable to the tool drive in an interchangeable manner by means of a quick connection or has the tool holder for attachment to the tool drive in a tool-releasable manner, forming one or more quick connections. This allows for very simple and quick assembly and disassembly, particularly without tools.

Preferably, the tool is placed axially onto the tool holder or its tool holder and removed axially from it for changing. This enables very easy assembly and disassembly or changing of the tool.

Particularly preferably, the magnetic coupling of the tool holder to the tool drive and/or the axial holding force of the quick connection is greater than the axial force for releasing the tool from the tool holder, in particular by more than 50%, particularly preferably by more than 100%.

Preferably, the tool holder or an assembly formed therefrom has one, several or all wear parts that are normally replaced for maintenance or servicing in a tool drive or in a device for polishing optical workpieces with the tool drive and the replaceable tool holder. A wearing part in the proposed sense is in particular a tilting bearing of a tool holder, such as the tool holder and a bearing part that holds the tool holder in a tiltable manner, and/or a bellows. In the event of wear, this enables a very simple and quick change or replacement, particularly without tools.

Preferably, the tool holder is designed in particular as a pre-assembled assembly with a tiltable tool holder and a bearing part that holds the tool holder in a tiltable manner. This allows for very simple and quick assembly and disassembly, particularly without tools.

Particularly preferably, the tool holder comprises the tiltable tool holder and preferably the bearing part which holds the tool holder in a tiltable manner and optionally a bellows assigned to the tool holder and/or a connecting part in particular for fastening the bellows to the tool drive and thus in particular forms a pre-assembled assembly. This makes it possible to easily and quickly change components that have to be changed frequently due to wear, since the tool holder can be changed very easily and quickly and, in particular, without tools due to the magnetic holder or quick connection.

Fig. 1

eine schematische Seitenansicht einer vorschlagsgemäßen Vorrichtung mit einem Werkzeug zum Polieren eines optischen Werkstücks in einem axial ausgefahrenen Zustand;

Fig. 2

einen schematischen Längsschnitt der Vorrichtung ohne Werkzeug;

Fig. 3

eine ausschnittsweise Vergrößerung von Fig. 2 im Bereich einer Werkzeugaufnahme;

Fig. 4

eine zu Fig. 3 korrespondierende ausschnittsweise Vergrößerung im Bereich der Werkzeugaufnahme, jedoch in einem axial eingefahrenen Zustand;

Fig. 5

eine perspektivische Schrägansicht der Vorrichtung mit Werkzeug im Bereich der Werkzeugaufnahme;

Fig. 6

einen schematischen Schnitt entlang Linie VI-VI von Fig. 5; und

Fig. 7

eine ausschnittsweise Draufsicht auf ein Verbindungsteil der Werkzeugaufnahme.

Further aspects, features, advantages and properties of the present invention emerge from the claims and the following description of a preferred exemplary embodiment with reference to the drawing. It shows:

Fig. 1

a schematic side view of a proposed device with a tool for polishing an optical workpiece in an axially extended state;

Fig. 2

a schematic longitudinal section of the device without tools;

Fig. 3

a partial enlargement of Fig. 2 in the area of a tool holder;

Fig. 4

one too Fig. 3 Corresponding detail enlargement in the area of the tool holder, but in an axially retracted state;

Fig. 5

a perspective oblique view of the device with tools in the area of the tool holder;

Fig. 6

a schematic section along line VI-VI of Fig. 5 ; and

Fig. 7

a partial top view of a connecting part of the tool holder.

Fig. 1 shows a side view of a proposed device 1 for polishing an optical workpiece, not shown, in particular a lens, such as a spectacle lens, a mirror or the like, particularly preferably made of plastic or glass, by means of a rotatable tool 2. The device 1 is also referred to as a polishing spindle .

The device 1 has a tool drive 3 and a tool holder 4.

The tool 2 is detachably attached or attachable to the tool holder 4. In particular, the tool 2 is plugged axially onto the tool holder 4 or can be detached from the tool holder 4 by axially pulling it off.

The tool holder 4 is preferably designed as a pre-assembled assembly, which can be changed very easily and/or quickly and, in particular, without tools.

The tool drive 3 preferably has a rotatable head 5, to which the tool holder 4 is attached or can be attached.

The tool drive 3 preferably has a housing 6 and a shaft 7 rotatably mounted therein. The shaft 7, which is preferably designed in several parts, is coupled in a rotationally fixed manner to the head 5 and, in the example shown, preferably has a pulley 8 or another drive element for rotating drive. However, it is also possible for a drive motor to be integrated, for example, into the tool drive 3 or coupled to the shaft 7 in some other way.

The head 5 and thus the tool holder 4 are preferably axially adjustable. For this purpose, in the example shown, the shaft 7 together with the head 5 is preferably axially adjustable relative to the housing 6. This serves in particular for a first or rough delivery of the tool 2 to a workpiece to be machined (not shown).

Fig. 2 shows the device 1 in a schematic longitudinal section.

The tool drive 3 has an actuating element 9 and in particular an associated actuating drive 10.

The actuating element 9 is axially movable, in particular axially relative and/or very easily to the shaft 7 or the head 5, in particular by means of the actuating drive 10.

The axial adjustability of the adjusting element 9 serves in particular for axial prestressing or continuous contact of the tool 2 on the workpiece to be machined. In particular, the actuating element 9 is in the in Fig. 2 shown extended position biased or advanced, particularly preferably by the actuator 10 or in some other way.

Particularly preferably, the actuating element 9 is moved or biased by pneumatic loading of the actuating drive 10 into the extended position or axially forward or (further) beyond the head 5 or towards the workpiece.

The tool 2, the tool holder 4, the head 5, the shaft 7 and/or the pulley 8 and possibly the adjusting element 9 can be rotated about the longitudinal axis or rotation axis R. The rotation about this axis R takes place during machining by the rotary drive, not shown, which here acts on the pulley 8.

In the example shown, the adjusting element 9 preferably rotates together with the shaft 7 or the head 5. Optionally or preferably, the adjusting element 9 is rotatable relative to the head 5 or to the shaft 7 and/or does not serve to transmit a torque to the tool 2.

Fig. 3 shows a partial enlargement of Fig. 2 the front or tool-side area of the device 1, now without the tool 2.

The tool holder 4 has a preferably tiltable tool holder 11 for holding the exchangeable tool 2.

Furthermore, the tool holder 4 preferably has a bearing part 12 which holds the tool holder 11 in a tiltable manner. In the example shown, the bearing part 12 preferably holds a particularly spherical bearing head or section 13 on which a bearing element 14, which carries the tool holder 11, sits in a tiltable manner. This kind of Bearing does not transmit torque. However, other constructive solutions are also possible here.

The tool holder 11 is preferably mounted in the manner of a ball head bearing on the bearing part 12 or can be tilted relative to it.

The tool holder 4 or the tool holder 11 or the bearing part 12 is magnetically coupled to the adjusting element 9 or held thereon - in particular axially. In the example shown, the adjusting element 9 preferably has a holding part 15 at its free end for holding the bearing part 12. In particular, the bearing part 12 can be attached or pushed onto the holding part 15.

The holding part 15 is preferably permanently or firmly connected to the adjusting element 9.

To realize the magnetic coupling or holder, in the example shown, the tool drive 3 or its actuating element 9 or its holding part 15 preferably has a magnet 16 or alternatively a magnetizable material, and the tool holder 4 or the tool holder 11 or the bearing part 12 then has Correspondingly, a holding element 17 made of a magnetizable material or a magnet.

In the example shown, the magnet 16 is designed as a permanent magnet and is preferably integrated or cast or glued into the holding part 15. However, other constructive solutions are also possible.

In the example shown, the holding element 17 is preferably integrated, inserted, glued or pressed into the bearing part 12.

If necessary, the magnet 16 and the holding element 17 can also be interchanged with one another, i.e. the magnet 16 can be arranged on the bearing part 12 and, conversely, the holding element 17 can be arranged on the holding part 15.

Preferably, the magnet 16 and the holding element 17 interacting with it are arranged on end faces that face one another in the assembled state, here of the holding part 15 and the bearing part 12, and/or come to rest on one another in the assembled state. This is conducive to a strong magnetic coupling or large magnetic holding force.

The magnetic coupling or holding force is preferably more than 10 N, in particular more than 20 N, particularly preferably more than 30 N and/or less than 150 N, preferably less than 100 N, in particular less than 80 N.

The magnetic coupling or holder only acts in the axial direction. Alternatively or additionally, this can also act radially, for example in the manner of a ring magnet.

Preferably, the bearing part 12 can be pushed onto the adjusting element 9 or the holding part 15 or can be connected to it in some other way, in particular in such a way that the bearing part 12 is guided or held radially. In the example shown, this is facilitated or made possible by the preferably cap-like or cup-like design and/or, for example, by providing holding arms distributed radially over the circumference.

The tool holder 4 preferably has a bellows 18 and/or a connecting part 19.

The bellows 18 is in particular assigned to the tool holder 11 and is preferably attached to the tool holder 11 with its tool-side end and optionally secured thereto with a fastening element (not shown), such as a ring, a clamp or the like.

With its other end remote from the tool, the bellows 18 is preferably held or fastened to the tool drive 3 or head 5 or connecting part 19. In the example shown, the bellows 18 is preferably attached, secured or held on the connecting part 19 by means of a securing element 20.

The connecting part 19 is preferably attached or attachable in a rotationally fixed manner to the tool drive 3 or head 5 or to the shaft 7.

In the example shown, the bellows 18 preferably serves to transmit the torque or rotation from the tool drive 3 or from the shaft 7 or from the head 5 to the tool holder 11 and thus ultimately to the tool 2 rotating during polishing. However, here too other constructive solutions possible. For example, alternatively or additionally, the actuating element 9 could also transmit a torque to the tool holder 11.

The bellows 18 can follow or bridge the axial delivery of the actuating element 9 and thus of the tool holder 11 relative to the tool drive 3 or head 5 or to the shaft 7 and / or serves as protection - in particular the tiltable storage of the tool holder 11 and / or the axially displaceable mounting of the adjusting element 9 - from contamination or other influences.

The tool holder 4 or assembly preferably has one, several or all wearing parts, such as the tilt bearing or the tool holder 11, the bearing part 12, the bearing head 13 and/or the bearing element 14, and/or such as the bellows 18 and/or other bearing elements , in particular all wearing parts of the device 1 or polishing spindle that are usually replaced during maintenance or servicing. This allows a very simple change or replacement, especially during maintenance or servicing.

Fig. 4 shows in one Fig. 3 Corresponding section shows the tool holder 4 or the tool holder 11 or the adjusting element 9 in an axially retracted or retracted state. In this state, the bellows 18 is axially compressed and/or the tool holder 11 is secured or supported or blocked against tilting.

In the example shown, the connecting part 19 preferably has a support section 19A, which extends in particular axially in the direction of the tool holder 11 and/or surrounds the adjusting element 9 or bearing part 12, in particular with its axial free end, which can optionally be provided with a contact section 19B can, in the retracted state, be able to rest against the side of the tool holder 11 and / or bearing element 14 facing away from the tool 2 and thereby secure or block the tool holder 11 against tilting in the retracted state, as in Fig. 4 indicated.

The tool change preferably takes place in the retracted state. This can be done in particular automatically by axially removing a used tool 2 and then replacing a new, different or unused tool 2.

Particularly preferably, the tool 2 is snapped or plugged onto the tool holder 11 and/or connected to the tool holder 11 in a rotationally fixed manner.

The connecting part 19 preferably has a particularly flange-like holding section 19C, which serves to attach or rest on the tool drive 3 or head 5.

In particular, the tool holder 4 or the connecting part 19 or the holding section 19C is connected or can be connected or coupled in a rotationally fixed manner to the tool drive 3 or head 5 in order to achieve the desired torque transmission to the tool holder 11 or the tool 2, here via the connecting part 19 and the bellows 18 on the tool holder 11.

The connecting part 19 is preferably formed in one piece and/or made of plastic.

The device 1 or the tool drive 3 or the tool holder 4 preferably has at least one quick connection 21 for attaching the tool holder 4 to the tool drive 3, in particular without tools.

In the example shown, the tool holder 4 or the connecting part 19 is attached or can be attached to the head 5 via at least one quick connection 21. In particular, several quick connections 21 are provided here, which are distributed over the circumference, in particular of the holding section 19C, as shown in the perspective view Fig. 5 indicated, which shows the tool-side end of the device 1 with the tool 2 and the tool holder 4.

The preferred structure of a quick connection 21 will be discussed in more detail below. Preferably, all quick connections 21 are constructed or implemented in the same way, but they can also be designed differently.

“Quick connection” here is preferably understood to mean a connection between two parts, in particular between the tool drive 3 on the one hand and the tool holder 4 on the other, which can be released in particular without tools and which provides sufficient support or support for normal operation, i.e. for polishing. Fastening effected.

To produce or form the quick connection 21, one or more quick connecting elements are preferably arranged or formed on the tool drive 3 and/or on the tool holder 4, in particular When the quick connection 21 is established, they are in contact with one another, preferably mechanically or magnetically, and/or engage with one another.

In the example shown, at least one spring arm 22 is arranged or formed as a quick-connecting element on the tool holder 4 or on the connecting part 19 or holding section 19C. To form a quick connection 21, several spring arms 22 are preferably provided, which here protrude into a recess 23, in particular from opposite sides, in particular in the form of two pairs of opposite sides, as in Fig. 7 indicated, which only shows a section of the holding section 19C of the tool holder 4.

In the example shown, at least one connecting section 24 is preferably arranged or formed as a quick-connecting element on the tool drive 3 or head 5. The connecting section 24 is here preferably spherical and/or undercut in the axial direction. Particularly preferably, the connecting section 24 is screwed or screwed into the head 5 by means of a carrier or attached to it in some other way.

Particularly preferably, when the quick connection 21 is made, the connecting section 24 is gripped behind by one or more spring arms 22 and/or held in the recess 23, as in Fig. 5 and 6 indicated. Fig. 6 shows a section along line VI-VI of Fig. 5 to illustrate the engagement or rear grip when the quick connection 21 is made, so that the quick connection 21 in particular holds or fixes the tool holder 4 in the axial direction on the tool drive 3.

In the example shown, the quick-connecting elements or spring arms 22 on the receiving side are preferably integrally formed, in particular on the connecting part 19 or its holding section 19C, or are formed in one piece with it. However, other constructive solutions are also possible.

In the example shown, the spring arms 22 preferably run at least essentially in the tangential direction and/or in pairs parallel and/or oppositely, in particular so that the counter element or the connecting section 24 is preferably held or centered centrally between the free ends of the spring arms 22 when the quick connection 21 is established becomes.

The quick connection 21 is preferably designed in such a way that the parts to be connected, here the tool drive 3, are mutually centered relative to the tool holder 4 or the connecting part 19 relative to the head 5.

To produce the quick connection 21 (by axially placing or compressing the tool drive 3 and the tool holder 4) and/or for releasing the quick connection 21 (by axially pulling or lifting the tool holder 4 from the tool drive 3), the spring arms 22 can each be, preferably elastically or resiliently or laterally, in particular to enable the connecting section 24 to move into or out of the recess 23 when a corresponding force is applied - here acting in the axial direction.

The force for releasing the quick connection 21 or all quick connections 21 and/or for establishing the quick connection 21 or all quick connections 21 is preferably greater, in particular by more than 50% or 100%, than the magnetic coupling or holding force and/or is preferably more than 50 N, in particular more than 20 N, particularly preferably more than 80 N.

The quick connection 21 is characterized in particular by the fact that tool-free production and release or a latching or snap connection is realized. Alternatively or additionally, a magnetic connection is also possible. In particular, the magnetic coupling or holding of the tool holder 11 or bearing part 12 on the tool drive 3 or actuating element 9 or holding part 15 can also be viewed or understood as a quick connection 21 in the sense mentioned or also as a second or additional quick connection 21. In particular, the proposed device 1 then has two different quick connections 21 and/or the tool holder 4 is designed to produce two different quick connections 21.

Preferably, the different or all connections 21 or all quick connections 21 can be made and/or released at the same time. Alternatively, it is also possible for the different quick connections 21 to be produced and/or released one after the other or successively. This is advantageous in that the forces required do not become too high.

The various quick-connecting elements can also be interchanged and/or replaced or supplemented by other types of elements. For example So the spring arms 22 can also be arranged on the tool drive 3 or head 5 and the connecting sections 24 on the tool holder 4 or on the connecting part 19.

Furthermore, a magnetic holder or coupling can also be provided as a quick connection 21 between the head 5 and the tool holder 4 or the connecting part 19.

In the example shown, the tool drive 3 or head 5 or the shaft 7 preferably has a centering section 25 for centering the tool holder 4 or the connecting part 19. Here, the centering section 25 preferably engages axially in the holding section 19C or support section 19A or the connecting part 19. However, other constructive solutions are also possible.

In the example shown, the quick connections 21 preferably serve not only for axial fastening or holding of the tool holder 4, but in particular also for a rotation-proof coupling. However, it is also possible to separate the rotary coupling and to design or use the quick connections 21 only for axial mounting or fastening, i.e. to implement the rotary coupling independently.

Particularly preferably, the force of the magnetic coupling of the tool holder 11 or bearing part 12 with the tool drive 3 and/or the axial holding force of the quick connection(s) 21 is greater than the axial force for releasing the tool 2 from the tool holder 11, in particular by more than 50 %, particularly preferably more than 100%. This ensures secure fastening or holding, even if the tools 2 are removed, particularly axially removed or changed in a particularly automated manner.

The tool holder 4, as an assembly, preferably comprises the tool holder 11, the bearing part 12, the bearing head 13, the bearing element 14, the bellows 18, the connecting part 19, the securing element 20 and/or one or more quick-connecting elements, such as the holding element 17 and/or spring arms 22.

The bearing head 13 is preferably made of metal and the bearing element 14 is preferably made of plastic, so that a preferably lubricant-free tilting bearing is realized. However, such a tilting bearing is subject to a certain amount of wear, as is the bellows 18, so that after appropriate use or if a change or replacement is necessary after appropriate wear. This is possible very simply, quickly and, in particular, without tools, due to the proposed design of the tool holder 4 as an assembly and/or the proposed fastening by means of one or more quick connections 21 or by the magnetic coupling or holder.

List of reference symbols:

1

contraption

2

Tool

3

Tool drive

4

Tool holder

5

Head

6

Housing

7

Wave

8th

pulley

9

Control element

10

Actuator

11

Tool holder

12

Bearing part

13

Bearing head

14

Bearing element

15

holding part

16

magnet

17

Holding element

18

bellows

19

connecting part

19A

Support section

19B

Investment section

19C

holding section

20

Security element

21

Quick connection

22

Spring arm

23

recess

24

connection section

25

centering section

R

Axis of rotation

Claims (15)

1. Tool holding fixture (4) for a tool drive (3) for polishing optical workpieces, in particular eyeglass lenses, by means of a rotatable tool (2),
   characterized
   in that the tool holding fixture (4) is embodied for magnetic coupling with and/or magnetic holding on an axially adjustable positioning element (9) of the tool drive (3).
2. Tool holding fixture according to claim 1, characterized in that the tool holding fixture (4) has a tiltable tool holder (11) for holding the tool (2).
3. Tool holding fixture according to claim 2, characterized in that the tool holding fixture (4) has a bearing part (12) which tiltably holds the tool holder (11).
4. Tool holding fixture according to claim 3, characterized in that the bearing part (12) is embodied for magnetic coupling with and/or holding on the axially adjustable positioning element (9) of the tool drive (3).
5. Tool holding fixture according to one of the preceding claims, characterized in that the tool holding fixture (4) has a bellows (18).
6. Tool holding fixture according to claims 2 and 5, characterized in that the bellows (18) is coupled in particular in a rotationally fixed manner to the tool holder (11).
7. Tool holding fixture according to one of the preceding claims, characterized in that the tool holding fixture (4) has at least one quick connection element for tool-free releasable fastening to the tool drive (3) by means of a quick connection (21).
8. Tool holding fixture according to claim 7, characterized in that the tool holding fixture (4) has one or more spring arms (22) as quick connection element(s).
9. Tool holding fixture according to claim 7 or 8, characterized in that the tool holding fixture (4) is embodied for establishing a plurality of quick connections (21), which are in particular distributed over a periphery.
10. Device (1) for polishing optical workpieces, in particular eyeglass lenses, by means of a rotatable tool (2),

    with a tool drive (3) and an exchangeable tool holding fixture (4) for rotating the tool (2),

    characterized

    in that the tool holding fixture (4) is embodied according to one of the claims 1 to 9 and is magnetically coupled or held with the axially adjustable positioning element (9) of the tool drive (3).
11. Device according to claim 10, characterized in that the tool drive (4) or its axially adjustable positioning element (9) has a magnet (16) for in particular axially holding the tool holding fixture (4) or a bearing part (12) of the tool holding fixture (4).
12. Device according to claim 10 or 11, characterized in that the tool holding fixture (4) is exchangeably fastened or fastenable to the tool drive (3) by means of a quick connection (21).
13. Device according to claim 12, characterized in that the quick connection (21) has at least one preferably undercut and/or spherical connecting portion (24).
14. Device according to claim 12 or 13, characterized in that the quick connection (21) is releasable without tools.
15. Device according to one of the claims 12 to 14, characterized in that the quick connection (21) is embodied such that it opens when an axial force is exceeded.

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