Patent · US Expired

Electromagnetic ram actuator

US4527139A · kind A · utility

6Cited by

4References

4Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Armin Bohg · Altensteig, DE
Kurt Hartmann · Duisburg, DE
Horst D. Matthaei · Waldenbuch, DE

Key dates

Filing date	May 30, 1984
Grant date	Jul 2, 1985
Priority date	—
Expiry date	May 30, 2004

Classification

Technology area (CPC H)Electricity
CPC primaryH01F7/1646
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

A high-speed reciprocating actuator, of the type used as a print hammer in high-speed printers or for operating valves or the like, is made more compact and efficient by the arrangement of a stator yoke. The stator yoke provides a series of aligned magnetic gaps that cooperate with armature bars contained in a reciprocating ram member. These gaps are made part of a plurality of independent flux conducting loops. One or more activating coils pass through each of the loops to induce magnetic flux when ram actuation is desired.

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