Electromagnetic reciprocating linear actuator with permanent magnet armature
Patent 4259653 Issued on March 31, 1981. Estimated Expiration Date: 
March 31, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
March 31, 1998. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3218523 3386378 3454956 3543279 3745495 3755766 3775714 Electromagnetic assembly for actuating a stylus in a wire printer Impact matrix print head solenoid assembly Electro-mechanical vibrator Patent #: 4129187 InventorAssigneeApplicationNo. 05/853958 filed on 11/22/1977US Classes:335/230, Polarized electromagnet310/15, Reciprocating310/30, Solenoid and core318/120, Stopping after predetermined number of reciprocations or cycles (including single cycle)400/124.17, Actuator having electromagnet400/124.2Permanent magnetExaminersPrimary: Duggan, Donovan F.Attorney, Agent or FirmInternational ClassesB41J 2/285 (20060101)B41J 2/27 (20060101) H01F 7/16 (20060101) H01F 7/08 (20060101) AbstractA spring-less linear actuator, especially useful as a print wire drive. A permanent magnet armature is driven from a rest position on a pole piece by magnetic repulsion upon energization of a solenoid by a D.C. pulse. The armature is fixed to a print wire which rebounds from a printing medium, thereby returning the permanent magnet toward the rest position, where it is held, without bouncing, by the magnetic attraction between the armature and the pole piece of the solenoid, which is now de-energized.Other References
Field of SearchReciprocating | |
