Tool spindle for a device for fine machining optically active surfaces on workpieces

Abstract

The invention relates to a tool spindle (10) for a device (12) for fine machining optically active surfaces (cc, cx) on workpieces (L), having a spindle housing (14) and a tool holding portion (16) which protrudes beyond the housing. The tool holding portion can be axially advanced (advancing axis Z) towards the workpiece along the tool rotational axis via a guiding assembly (18), which can be rotated about a tool rotational axis (A) in the spindle housing, and if necessary can be tilted about a tilting point (K) on the tool rotational axis. In order to axially advance the tool holding portion, the guide assembly has a plurality of linear mounting elements (20), which are distributed about the tool rotational axis in a uniform manner, and respective paired guide rods (22), which are connected to the tool holding portion in a traction- and pressure-resistant manner. In this manner, the tool holding portion is capable of following the macro geometry of the workpiece in a smooth and delicate manner when machining the micro geometry of the workpiece.

Description

technical field [0001] The invention generally relates to a tool spindle of an installation for finishing an optically active surface of a workpiece. In particular, the invention relates to a tool spindle of a device such as is widely used for the finishing of optically active surfaces of spectacle lenses in so-called "prescription (RX) workshops", i.e. for the production of individual spectacle lenses according to prescriptions. Production facilities. However, this should not be interpreted as limiting in any way; on the contrary, it can also be considered for precision optics (lens production, mirror production and casting mold production), it can be seen that in precision optics, there is an orientation towards In particular there is a growing trend towards more complex parts with aspheric surfaces and freeform surfaces. [0002] When reference is made below to workpieces with optically active surfaces by the example of "spectacle lenses", it is to be understood that this...

AI Technical Summary

Problems solved by technology

[0012] Although such slotted shaft guides are readily available on the market, for example from Nippon Bearing Co., Ltd., Ojiya, Japan, as stated in the introduction to document WO 2012 / 123120 A1, It has the disadvantage that the axial mobility of the tool mounting head is not as fine and sensitive compared to the prior art, where the torque transmission from the polishing tool to the spindle shaft is arranged in the diaphragm chuck tool. Behind the axial guide (guide element 176)

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