公开(公告)号：DE1276380B

公开(公告)日：1968-08-29

申请号：DEJ0034875

申请日：1964-07-25

Applicant: IBM DEUTSCHLAND

Inventor： ARNOLD SIEGHARD ,  BUEHRMANN GEROLD ,  HAASIS JUERGEN ,  HEINRICH HORST ,  NITSCHKE MANFRED ,  SCHACHT GUENTER ,  SPIETH EBERHARD

IPC: B41J9/36

公开(公告)号：DE1258691B

公开(公告)日：1968-01-11

申请号：DEJ0029485

申请日：1965-11-30

Applicant: IBM DEUTSCHLAND

Inventor： BUEHRMANN GEROLD HELMUT ,  SPIETH EBERHARD

IPC: B41J9/127 ,  F16F1/26 ,  H02K33/02

公开(公告)号：DE1237816B

公开(公告)日：1967-03-30

申请号：DEJ0024310

申请日：1963-08-24

Applicant: IBM DEUTSCHLAND

Inventor： SCHACHT GUENTER ,  SPIETH EBERHARD

IPC: B41J9/10 ,  B41J9/38 ,  G06K15/02

Abstract: 1,010,983. Selective printing. INTERNATIONAL BUSINESS MACHINES CORPORATION. Aug. 11, 1964 [Aug. 24, 1963], No. 32653/64. Heading B6F. Type-wheel machines; type-band machines; type-bar machines; hammer-impression mechanism; electric signal input arrangements.- A high-speed selective printer used for output units of data processing machines and having types mounted on a rotary-type carrier, a chain or type bars, is provided with an electromagnetically operated drive mechanism for a plurality of hammers 1 comprising a corresponding plurality of electromagnets 11 for each of which the print hammers 1 are adapted to form an armature in that the hammers carry two armature yokes 12, 13 of soft magnetic material, said electromagnets exerting on said hammers a force in the impression direction. Each hammer 1 comprises a bar of rectangular cross-section having a hammer head on its front end and the hammer is mounted on a pair of leaf springs 3, 4 serving also to return the hammer to its rest position after impression. The hammer also carries two U- shaped armature yokes 12, 13, the polar surfaces 14 are inclined and co-operate with like polar surfaces 15 of the electromagnet 11 having coils 16, 17 energized with current pulses J2 and J1 respectively. The pulse J1 is of short duration but higher amplitude, whereas the pulse J2 is of longer duration and is ineffective by itself to displace the hammer into its printing position. For impression, both coils 16, 17 are energized simultaneously by said pulses J1 and J2, but when the short pulse J1 terminates on completion of impression the pulse J2 produces a magnetic force retarding the return movement of the hammer, thus preventing rebound. The return movement is limited by a buffer stop 9 having a mass equal to the hammer 1 and clamped to an elastic separator 10.