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:
Apr. 27, 1993
Filed:
Jul. 10, 1990
Bernd Gugel, Ulm-Einsinger, DE;
Johann Stempfle, Pfaffenhofen, DE;
Abstract
A matrix print head comprises several armature device groups which, in each case, comprise a magnet yoke (9) with an electromagnetic coil (10), disposed on one of the magnet yoke arms (9a), and an armature (8), which armature serves as a drive for a print element (2). The armature (8) can be moved in a rapid sequence against the pole faces (20b) of the magnet yokes (9) and back into a rest position. In order to reduce the wear at the pole faces (20a and 20b) or, respectively, at the wear faces (18), high temperature-stable lubricants can be disposed and intercalated in capillary hollow spaces (17) of armatures (8) and/or magnet yokes (9). These capillary hollow spaces (17) are adjoining and running to the wear faces (18).