公开(公告)号：US4048665A

公开(公告)日：1977-09-13

申请号：US641859

申请日：1975-12-17

申请人： Bruno Lia ,  Giorgio Vigini

发明人： Bruno Lia ,  Giorgio Vigini

IPC分类号： B41J2/30 ,  B41J9/44 ,  G06K15/06 ,  H01F7/18 ,  H03K17/64 ,  H01H47/32

CPC分类号： H01F7/18 ,  B41J9/44 ,  H03K17/64

摘要： A circuit for energizing the electromagnet of the print head of a high speed impact printer, wherein such circuit operates effectively with an unregulated supply voltage by providing energization current pulses whose level and duration are dependent on the present level of such supply voltage.