Patent · US Expired

Method and device for controlling a drive unit of a pile-lifting device at a sheet-fed printing machine

US5201509A · kind A · utility

4Cited by

4References

4Claims

0Family size

Assignee

Heidelberger Druckmaschinen AG · DE

Inventors

Stephan Kirchhoff · Birkenau, DE
Helmut Meyer · Hilden, DE
Christian Thomas · Walldorf, DE

Key dates

Filing date	Jun 27, 1991
Grant date	Apr 13, 1993
Priority date	—
Expiry date	Jun 27, 2011

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S414/104
WIPO fieldHandling
WIPO sectorMechanical engineering

Abstract

A method of controlling a drive unit of a pile-lifting device located at a sheet-fed printing machine includes starting-up the drive unit with a first mode of operation selected by an electronic current wherein rated torque is high and rated speed is low for respectively lifting and lowering the pile and, after a given period of time, following the starting-up of the drive unit, switching to a second mode of operation of the drive unit wherein the rated torque is low and the rated speed is high if the speed has exceeded a preset value during a lifting of the pile, and has not exceeded a preset value during a lowering of the pile; and a device for performing the method.

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