专利内容由知识产权出版社提供
专利名称：Printer
发明人：GOMI; YOSHIFUMI申请号：US32284073申请日：19730111公开号：US3878778A公开日：19750422
摘要：A printer has a plurality of print hammers displaceable between a rest positionand a print position, and respective deformable elastic bodies maintained in a deformedposition by each print hammer in its rest position and biasing the print hammer toward itsprint position. Respective magnetic circuit control means are selectively operable to holdeach print hammer in its rest position and to release the print hammer for displacementto the print position by the respective elastic body. Each magnetic circuit control meansincludes a permanent magnet, a first hammer-hold magnetic circuit including a portion ofthe respective hammer and a second release magnetic circuit including a release coiloperable to release the print hammer from its rest position responsive to a printcommand signal thereto in a direction to increase the magneto-motive force in thesecond magnetic circuit with a corresponding decrease in the magneto-motive force inthe first magnetic circuit to release the respective print hammer for movement to itsprint position by the associated elastic body. The second magnetic circuit has a magneticreluctance greater than that of the first magnetic circuit. The first and second magneticcircuits are connected in parallel with the permanent magnet. In one embodiment of theinvention, the greater magnetic reluctance is provided by an adjustable air gap in thesecond magnetic circuit. In another embodiment of the invention, the two magnetic
circuits are connected in parallel with the permanent magnet through a common air gaphaving a reluctance greater than that of the print hammer portion in the first magneticcircuit.
申请人：KABUSHIKI KAISHA SUWA SEIKOSHA
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