Patent · US Expired

Drive apparatus for a forming machine

US6021683A · kind A · utility

9Cited by

0References

15Claims

0Family size

Assignee

Verein Deutscher Werkzeumaschinenfabriken e. V. (VDW) · DE

Inventors

Eckart Doege · Hemmingen, DE
Martin Hindersmann · Hannover, DE
Ulrich Keller · Aachen, DE

Key dates

Filing date	Jan 15, 1997
Grant date	Feb 8, 2000
Priority date	—
Expiry date	Jan 15, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T74/19884
WIPO fieldMachine tools
WIPO sectorMechanical engineering

Abstract

The invention concerns a drive unit for a forming machine, comprising a rotary drive and a knuckle-joint drive for a gear transmission operating a ram, the knuckle-joint drive being operationally connected through a gear transmission to the rotary drive. To improve the drive rigidity as regards a forming machine and to be able to improve the drive-unit design and to relatively easily match the drive unit to the specific requirements of different forming methods, the gear transmission offers a periodically varying transmission ratio, at least two mutually engaging non-circular gears being used of which the pitch curves are designed in such manner that in conjunction with the knuckle-joint drive, and especially in conjunction with a subsequent crank drive, the motions of the ram will be optimally matched thereby to the particular work method.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.