公开(公告)号：US5169246A

公开(公告)日：1992-12-08

申请号：US552498

申请日：1990-07-16

申请人： Francesco Bernardis ,  Claudio Marangon

发明人： Francesco Bernardis ,  Claudio Marangon

IPC分类号： B41J2/25 ,  B41J2/255 ,  B41J2/265

CPC分类号： B41J2/255

摘要： A wire printing head for a high resolution printing machine is provided together with a method for its manufacture. The printer is of the type comprising a printing platen for a recording medium and a carriage transversely movable with respect to the printing platen and mounting the printing head. The head comprises a guide matrix adjacent the platen and a plurality of printing wires or needles guided by the matrix. The wires are capable of longitudinal movement and define on the recording medium printing dots having an area less than the nominal section (Sn) of the wires. Each wire comprises a front portion of constant section (Sr) which is reduced with respect to the nominal section (Sn) and extends for a minimized length of between 0.5 and 4 times inclusive the diameter (Dr) of the reduced section. The guide matrix supports slidably a terminal portion of the wires comprising the nominal section and lodges with play the frontal portion having the reduced section.

公开(公告)号：US4995743A

公开(公告)日：1991-02-26

申请号：US289840

申请日：1988-12-27

申请人： Francesco Bernardis ,  Claudio Marangon ,  Rinaldo Ferrarotti

发明人： Francesco Bernardis ,  Claudio Marangon ,  Rinaldo Ferrarotti

IPC分类号： B41J2/28 ,  B41J2/235 ,  B41J2/275

CPC分类号： B41J2/275 ,  Y10T29/4902

摘要： Each needle of the printer has an associated electromagnet with a generally elongate movable armature having a first end and a second end which can selectively push the needle during printing as a result of a pivoting movement within a step formation facing the electromagnet. The step formation divides the armature into first and second portions facing the first and second ends respectively, and faces the respective electromagnet in such a position that the second portion of the armature at least partially faces the electromagnet.