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. 29, 1986
Filed:
May. 03, 1985
Edward D Bringhurst, Seattle, WA (US);
Mannesmann Tally Corporation, Kent, WA (US);
Abstract
An actuating mechanism includes a magnetic circuit formed by a permanent magnet (43), a flux plate (45), a return plate (47), a post (49), and a long release coil (51). The outer end of the release coil (51) terminates slightly short of the tip of the post. Further, the post (49), long coil (51), flux plate (45) and return plate (47) are sized and positioned such that the tip of the post (49) lies coplanar with the outer surface of the return plate (47) and such that the end of the return plate (47) terminates just short of the release coil (51). The head (59) of a hammer (53) is positioned to be attracted to the post tip by the magnetic flux created by the permanent magnet (43). The permanent magnet attraction force bends the head (59) of the hammer (53) across the small gap resulting in the hammer (53) being cocked. When the long release coil (51 ) is energized, it produces a magnetic field that counteracts the permanent magnet attraction force, releasing the cocked hammer. Release of the cocked hammer impacts a ball (61), welded to the side of the hammer (53) remote from the pole tip, against a ribbon to create a dot on a print-receiving medium. Because the release coil (51) terminates just short of the tip of the post (49), the intensity of the flux produced by the coil (51) at the interface between the post tip and the hammerhead (59) is high.