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:
May. 30, 1989
Filed:
Aug. 31, 1987
Edward D Bringhurst, Seattle, WA (US);
Mannesmann Tally Corporation, Kent, WA (US);
Abstract
Stored energy print hammer actuators (11) having high efficiency coil posts (19) are disclosed. The coil posts (19) include a cylindrical core (33) mounted on a pin (35). The cylindrical core (33) has high resistivity and, thus, minimizes eddy currents and the power losses created by eddy currents. The cylindrical core (33) also has low hysteresis loss. In one form, the core (33) is formed of layers of a high resistivity material shaped to prevent eddy currents from circulating about the circumference of the posts. Suitable shapes include discrete C-layers and continuous spiral layers. Preferably, the layers are coated with an electrical insulating material that prevents cross-lamination eddy current flow. In another form, the core is formed of a high resistivity homogenous material, such as a ferrite material or a magnetic powder and an adhesive binder.