The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 21, 1989
Filed:
Jun. 11, 1987
Norbert Hebbruggen, Eschenbach, DE;
EMAG Maschinenfabrik GmbH, , DE;
Abstract
The center drive machine comprises on each machine bed half a center drive headstock for seating and driving the workpiece and in each instance a tool holder slide for the uptake of tools. Both machine units are movable on the same machine bed. For setting the machine according to the workpiece length and for executing the work cycle, both machine units are movable on the machine bed by means of a single drive unit, the drive unit being disposed at one of these machine units and engaging at the other machine unit. For moving the machine units along the machine bed, one machine unit is clamped to the machine bed, allowing the drive to brace itself against this clamped machine unit and the other machine unit to move. The drive unit comprises a servomotor and a spherical roller spindle. After extension of the total length of the spherical roller spindle, the previously clamped machine unit is released and the other machine unit clamped relative to the machine bed, so that then the previously clamped machine unit can be moved. By means of the drive unit, not only the moving of the machine units in rapid motion but also the feed during machining is carried out.