Printing head assembly

Details Printing head assembly Printing head assembly

1985-01-10

1986-07-15

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, 400694, 335303, 252 6253, B41J 312, C04B 3504

Patent

active

046003231

ABSTRACT:
A printing head assembly having a permanent magnet to attract magnetic members such as armatures to store the strain energy in resilient members such as leaf springs, electro-magnets to cancel the magnetic flux generated by the permanent magnets in order to drive the magnetic members, first yokes related to cores of the electro-magnets, and second yokes forming surfaces by the permanent magnet and serving to form fulcrums of rotation of the magnetic members. The permanent magnet is mounted on the first yoke and the second yoke is mounted on the permanent magnet respectively. In order to equalize attracting force by the permanent magnet among a plurality of armature actuating mechanisms and to adjust the height of the surface of the second yoke, with a predetermined height, there is applied a powdery magnetic material mixed into a bonding agent on at least one side of the permanent magnet. This bonding layer can also absorb some errors caused by the production of the first and second yokes and the permanent magnet.

REFERENCES:
patent: 3808135 (1974-04-01), Weigel
patent: 3896918 (1975-07-01), Schneider
patent: 4044668 (1977-08-01), Barrus
patent: 4225250 (1980-09-01), Wagner
patent: 4412929 (1983-11-01), Lysenko
patent: 4423969 (1984-01-01), Kobryn
patent: 4427481 (1984-01-01), Smith
patent: 4493567 (1985-01-01), Tada
patent: 4498791 (1985-02-01), Gilbert
patent: 4511269 (1985-04-01), Takahashi

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