Print hammer for printers and typewriters

Details Print hammer for printers and typewriters Print hammer for printers and typewriters

1984-02-17

1985-07-16

Burr, Edgar S.

Typewriting machines

Including type-set-assemblage mounted on carrier and...

Imprint by movement of record-medium against type-face

400167, 400686, 101 9302, 101 9348, 335255, B41J 938, B41J 942

Patent

active

045293260

ABSTRACT:
A print hammer for printers and typewriters comprises a hammer rod (11) which is axially movable in a housing (17, 18). The hammer rod is biassed towards a rest position by a spring and can be moved to a print position by a drive means, for example a solenoid coil (19). The hammer rod delimits a room (31) in the housing the size of which increases during the movement of the hammer rod towards the print position. The room (31) is connected to the surrounding atmosphere via a narrow channel (33) and also via a valve means (25, 28) which is open during the movement to the print position but closed during the return movement to the rest position. The valve means (25, 28) also forms a stop member for the hammer rod (11) in the rest position.

REFERENCES:
patent: 1437724 (1922-12-01), Creveling
patent: 1931178 (1933-10-01), Carlson
patent: 1995620 (1935-03-01), Monroe
patent: 3828911 (1974-08-01), Soderstrom
patent: 4044323 (1977-08-01), Sleger
IBM Technical Disclosure Bulletin, vol. 22, No. 4, Sep. 1979, pp. 1318-1319. "Self Cooled print Hammer", by Mathews.

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