公开(公告)号：US4423675A

公开(公告)日：1984-01-03

申请号：US355982

申请日：1982-03-08

申请人： Zong S. Luo ,  Chor S. Chan

发明人： Zong S. Luo ,  Chor S. Chan

IPC分类号： B41J9/24 ,  B41J9/133 ,  B41J9/38 ,  B41J9/44 ,  B41J3/00

CPC分类号： B41J9/38 ,  B41J9/133

摘要： A high-speed print hammer and magnetic actuator is provided which operates with a minimum of power dissipation, can achieve high speed, and has very little flux leakage beyond the mechanical structure. The magnetic actuator is made up of two pole pieces having a high magnetic permeability, with a permanent magnet therebetween. A print hammer, also having a portion constructed of a material with a high magnetic susceptiblity, is pulled away from its unsprung position by the permanent magnet and contacts the faces of the pole pieces, providing a very low reluctance magnetic path between them. The print hammer is released from this cocked position by a pulsed electromagnetic field applied in a direction opposite that of the permanent magnet, the pulse pattern corresponding to the desired impact pattern of the print hammer. Lower drive power to the electromagnet is achieved by providing an alternate magnetic path having a reluctance intermediate between that provided by the print hammer when it is in contact with the pole faces, and the reluctance between the pole faces (i.e., through the air) when the print hammer is not in contact with the pole faces.

摘要翻译： 提供高速打印锤和磁性致动器，其以最小的功率耗散进行操作，可以实现高速度，并且具有超出机械结构的极少的通量泄漏。 磁致动器由具有高磁导率的两个极片组成，其间具有永磁体。 还具有由具有高磁化率的材料构成的部分的打印锤被永久磁铁从其簧下位置拉开，并与极片的表面接触，从而在它们之间提供非常低的磁阻磁路。 通过施加在与永久磁铁相反的方向上的脉冲电磁场​​，打印锤被从该起始位置释放，脉冲图案对应于打印锤的期望的冲击图案。 通过提供一种交替的磁路来实现对电磁体的较低的驱动力，该交替磁路具有当打印锤与极面接触时由打印锤提供的磁阻之间的磁阻中心，以及磁极面（即通过空气）之间的磁阻， 打印锤不与杆面接触。