Print head having a wear resistant rotational fulcrum

Details Print head having a wear resistant rotational fulcrum Print head having a wear resistant rotational fulcrum

1987-09-01

1989-02-07

Sewell, Paul T.

Typewriting machines

Typing by other than type-face or type-die

Character formation by impact

101 9305, B41J 312

Patent

active

048027766

ABSTRACT:
A print head having magnetic members attracted by a permanent magnet while resiliently deflecting resilient members connected to one ends thereof associated with corresponding solenoids adapted to selectively release the associated magnetic members by cancelling the magnetic attracting force of the permanent magnet, so that the magentic member is actuated by the energy stored in the resilient members to drive printing elements into a printing position. To reduce the moment of inertia of the magnetic member, the magnetic pole surface of the permanent magnet or a yoke mounted on the permanent magnet is contacted with one end of the magnetic member to form a fulcrum for the rotation of the magnetic member. The magnetic pole surface of the permanent magnet or yoke on the permanent magnet and at least the fulcrum portion of the magnetic member are provided with hardened wear-resistant layers formed, for example, by plating with nickel, thereby achieving a higher resistance to wear. The wear of the magnetic pole surface of the fulcrum and of the magnetic member are reduced thereby avoiding non-uniformity of the moment of force in the magnetic members, as well as the resilient force in the resilient members, thereby ensuring a high uniformity of the impacting force applied to all printing elements.

REFERENCES:
patent: 3994381 (1976-11-01), Hebert
patent: 4084678 (1978-04-01), Reier
patent: 4225250 (1980-09-01), Wagner
patent: 4225339 (1980-09-01), Inomata
patent: 4244658 (1981-01-01), Mori
patent: 4368353 (1983-01-01), Ando
patent: 4416709 (1983-11-01), Ohya
patent: 4423969 (1984-01-01), Kobryn
patent: 4511269 (1985-04-01), Takahashi

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