Wire printing device with internal supports for thermal conducti

Details Wire printing device with internal supports for thermal conducti Wire printing device with internal supports for thermal conducti

1985-06-12

1986-07-29

Burr, Edgar S.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

400719, 101 9305, B41J 310

Patent

active

046028811

ABSTRACT:
A ballistic type wire printing head comprises a metal front support (11) for guiding the printing wires (23) and supporting a group of actuating electromagnetic units (37, 39, 41) associated with the wires. The armatures (41) of the electromagnetic units are pre-assembled on a disc (40) of plastics material. A rear cover (59) which is also of metal encloses the electromagnetic units and in its interior supports spring spider (58) which co-operates with all the armatures of the electromagnetic units. The electromagnetic units have a common internal, ferromagnetic support (35) from which heat is conducted to the front support (11) and cooling fins (25). In a second embodiment, the printing head also comprises a second group of electromagnetic units associated with another series of printing wires. In that case, an intermediate metal member acts as a cover member for the first group of electromagnetic units and as a support for the second group of electromagnetic units.

REFERENCES:
patent: 3861503 (1975-01-01), Nash
patent: 3904011 (1975-09-01), Matschke et al.
patent: 3929214 (1975-12-01), Herbert
patent: 4009772 (1977-03-01), Glaser et al.
patent: 4044878 (1977-08-01), Kunath
patent: 4165940 (1979-08-01), Cacciola
patent: 4236837 (1980-12-01), Seilly
patent: 4279521 (1981-07-01), Kightlinger
patent: 4335969 (1982-06-01), Ott
patent: 4350450 (1982-04-01), Durr et al.

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