Print hammer bank in modular design

US4651640A · kind A · utility

Assignee

• International Business Machines Corporation · US

Inventors

• Armin Bohg · Altensteig, DE
• Kurt Hartmann · Duisburg, DE

Key dates

• Filing date: Sep 4, 1985
• Grant date: Mar 24, 1987
• Expiry date: Sep 4, 2005

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B41J9/127
• WIPO field: Textile and paper machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a print hammer bank of electromagnetic print hammer actuators in modular design of the type which includes a plurality of actuators each of which comprises a stator formed in two halves, each half including an electromagnet and a plurality of pole pieces, and means for positioning the stator halves relative to each other so that the ends of the pole pieces of the two halves are spaced apart in pairs so as to form a plurality of aligned operating gaps. The armature elements are designed so that the volume of each armature element is of the order of the volume of the associated operating gap. A print hammer bank in accordance with the invention is characterized in that the print hammer bank consists of two spaced apart rows of modules of the same geometrical shape and design forming the stator halves with the armature members located side by side in the space between the rows of modules, in that, for adjacent print hammers, the associated electromagnets are staggered relative to each other within the associated module, and in that each module, looking at the side facing the armature members, is shaped like a parallelogram.