Device for fine machining of optically effective surfaces on in particular spectacle lenses and flexible production cell comprising such a device

Patent metadata

Field	Value
Publication number	US-9321145-B2
Application number	US-201314384011-A
Country	US
Kind code	B2
Filing date	Jan 29, 2013
Priority date	Mar 10, 2012
Publication date	Apr 26, 2016
Grant date	Apr 26, 2016

Abstract

The invention relates to a polishing machine for spectacle lenses, including a least one workpiece spindle protruding into a workspace for a rotary drive of the spectacle lens about a workpiece rotational axis. At least one feed device lowers and raises a polishing tool relative to the spectacle lens. An oscillation drive unit moves the feed device back and forth in an oscillation direction, which during the polishing runs substantially transversely to the workpiece rotational axis. A swivel drive unit swivels the feed device about a swivel-adjusting axis which runs substantially perpendicular to the workpiece rotational axis and substantially normal to the oscillation direction. A swivel mechanism is provided to swivel the feed device, the oscillation drive unit and the swivel drive unit relative to the workpiece.

First claim

The invention claimed is:

1. A device for the finish-processing of optically effective surfaces of, in particular, spectacle lenses as workpieces, comprising:
a pivot mechanism having a pivot frame pivotably mounted to provide a closed operating position, in which a working space located below the pivot frame creates a cavity for processing the workpieces and an open access position; in which the cavity is open to provide access to the workpieces,
at least one workpiece spindle, which projects into the working space and by way of which a workpiece to be processed is drivable to rotate about a workpiece axis of rotation,
at least one feed device for a tool, by which the tool is movable towards the workpiece and away therefrom,
an oscillatory drive unit, by which the feed device is reciprocatingly movable in a direction of oscillation which when processing takes place extends substantially transversely to the workpiece axis of rotation,
a pivot drive unit, by which the feed device is pivotable about a pivot adjusting axis extending substantially perpendicularly to the workpiece axis of rotation and substantially normal to the direction of oscillation, and
wherein the feed device, the oscillatory drive unit, and the pivot drive unit are all mounted to the pivot frame which collectively pivots the feed device, the oscillatory drive unit and the pivot drive unit relative to the workpiece spindle between the closed operating position and the open access position.

2. A device according to claim 1 , characterized in that the pivot mechanism has for the feed device, the oscillatory drive unit and the pivot drive unit a common pivot axis about which the feed device, the oscillatory drive unit and the pivot drive unit are pivotable away in common with respect to the workpiece spindle and conversely.

3. A device according to claim 2 , characterized in that the pivot axis lies behind the working space as seen from an operator position.

4. A device according to claim 3 , characterized in that the pivot axis extends substantially in parallel to the pivot adjusting axis.

5. A device according to claim 4 , characterized in that the pivot frame has a grip section, via which the feed device, the oscillatory drive unit and the pivot drive unit are manually pivotable away with respect to the workpiece spindle and conversely.

6. A device according to claim 5 , characterized in that the pivot frame carries a hood for opening and closing the device.

7. A device according to claim 6 , characterized in that the pivot mechanism comprises at least one spring element, which facilitates a pivoting motion away of the feed device, the oscillatory drive unit and the pivot drive unit with respect to the workpiece spindle.

8. A device according to claim 7 , characterized by a positioning and closing mechanism which during the processing holds the feed device, the oscillatory drive unit and the pivot drive unit in their closed position and ensures a substantially perpendicular alignment of the linearly extending oscillation direction with respect to the workpiece axis of rotation.

9. A device according to claim 8 , characterized in that the positioning and closing mechanism comprises a pressure-medium cylinder for holding the feed device, the oscillatory drive unit and the pivot drive unit in their closed position.

10. A device according to claim 9 , characterized in that the positioning and closing mechanism comprises at least one adjustable abutment, which optionally comprises a shock absorber and by which the orientation of the oscillation direction with respect to the workpiece axis of rotation is adjustable.

11. A device according to claim 10 , characterized by a base body, which bounds the working space and supports the workpiece spindle and to which two mounts supporting the pivot axis are fastened, wherein the oscillatory drive unit comprises a guide block pivotably mounted on the pivot axis between the mounts.

12. A device according to claim 11 , characterized in that the oscillatory drive unit comprises two guide rods, that are longitudinally displaceably supported in the guide block, a guide head and a guide plate, wherein the guide rods are connected together on one side of the guide block by way of the guide head, whereas they are connected together on the other side of the guide block by way of the guide plate, and wherein the guide head is displaceable relative to the guide block by a threaded drive.

13. A device according to claim 12 , characterized in that the pivot drive unit has a pivot yoke, which carries the feed device and which is pivotably supported on the guide head of the oscillatory drive unit, wherein arranged between the guide plate of the oscillatory drive unit and the pivot yoke is a stroke module by which the pivot yoke is pivotable about the pivot adjusting axis.

14. A device according to claim 13 , characterized by two workpiece spindles, which project into the working space and which are drivable for rotation about the workpiece axes of rotation by way of a belt drive comprising a belt pulley rotatable by a rotary drive, a belt and a tensioning and return pulley for the belt, which is seated between the workpiece spindles and mounted on the rotary drive eccentrically with respect to the belt pulley so that the belt is tensionable by a pivoting motion of the rotary drive.

15. A device according to claim 2 , characterized in that the pivot axis extends substantially in parallel to the pivot adjusting axis.

16. A device according to claim 2 , characterized by a base body, which bounds the working space and supports the workpiece spindle and to which two mounts supporting the pivot axis are fastened, wherein the oscillatory drive unit comprises a guide block pivotably mounted on the pivot axis between the mounts.

17. A device according to claim 1 , characterized in that the pivot mechanism has a pivot frame with a grip section, via which the feed device, the oscillatory drive unit and the pivot drive unit are manually pivotable away with respect to the workpiece spindle and conversely.

18. A device according to claim 17 , characterized in that the pivot frame carries a hood for opening and closing the device.

19. A device according to claim 1 , characterized in that the pivot mechanism comprises at least one spring element, which facilitates a pivoting motion away of the feed device, the oscillatory drive unit and the pivot drive unitwith respect to the workpiece spindle.

20. A device according to claim 1 , characterized by a positioning and closing mechanism which during the processing holds the feed device, the oscillatory drive unit and the pivot drive unit in their closed position and ensures a substantially perpendicular alignment of the linearly extending oscillation direction with respect to the workpiece axis of rotation.

21. A device according to claim 20 , characterized in that the positioning and closing mechanism comprises a pressure-medium cylinder for holding the feed device, the oscillatory drive unit and the pivot drive unit in their closed position.

22. A device according to claim 20 , characterized in that the positioning and closing mechanism comprises at least one adjustable abutment, which optionally comprises a shock absorber and by which the orientation of the oscillation direction with respect to the workpiece axis of rotation is adjustable.

23. A device according to claim 1 , characterized by two workpiece spindles, which project into the working sp

Assignees

• Satisloh Ag

Inventors

• Wallendorf Steffen
• Schäfer Holger

Classifications

• B24B27/0084

  the grinding wheel support being angularly adjustable · CPC title

• B24B13/0037

  the lenses being worked by different tools, e.g. for rough-grinding, fine-grinding, polishing · CPC title

• B24B41/005

  Feeding or manipulating devices specially adapted to grinding machines (feeding, loading or unloading work specially adapted to lapping machines B24B37/345) · CPC title

• B24B13/00 Primary

  Machines or devices designed for grinding or polishing optical surfaces on lenses or surfaces of similar shape on other work; Accessories therefor (edging optical work, e.g. lenses, prisms B24B9/14) · CPC title

• B24B47/22 Primary

  Equipment for exact control of the position of the grinding tool or work at the start of the grinding operation · CPC title