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:
Mar. 02, 1976
Filed:
Apr. 29, 1974
Warren L Dalziel, Monte Sereno, CA (US);
Shugart Associates, Inc., Sunnyvale, CA (US);
Abstract
A print hammer apparatus is disclosed which comprises a resilient member having a fixed end and a movable end, the movable end being movable between a cocked position and a striking position, a hammer affixed to the movable end and carried thereby over an arcuate path between the cocked position and the striking position, the hammer including an impact head at one end and a flag member at the other end, the flag member being of magnetic material and having a flag face with a surface which is at all points angularly disposed at an angle other than normal to the path, a stator pole piece having a pole face which matingly corresponds to the flag face, a magnetic side pole disposed laterally of the path, a permanent magnet coupled to the pole piece and to the side pole and operative to develop a magnetic force for causing the hammer to move against the influence of the resilient member and into the cocked position with the flag face engaging the pole face, and a coil disposed on the pole piece for momentarily developing a magnetic flux in opposition to the flux developed by the permanent magnet, thereby reducing the magnetic force and allowing the hammer to move along the path into the striking position under the influence of the resilient member, the resilient member being operative to thereafter return the hammer along the path to the cocked position whereby the flag face impacts the pole face and whereby the interaction of the angularly engaging faces and the magnetic relationships between the pole piece, the flag member and the side pole cause the hammer to experience substantially no contact bounce.