Ink-dot printer

Details Ink-dot printer Ink-dot printer

1985-10-21

1987-09-29

Pearson, Charles A.

Typewriting machines

Annular typewriter

400124, 400470, 101 9305, 346140R, B41J 312, B41J 2719

Patent

active

046965890

ABSTRACT:
An ink-dot printer comprises a pair of slit forming members arranged to define a slit therebetween, an ink tank for storing ink in which the slit is immersed, a recording sheet opposed to the slit, a needle movable between a rest position and a projected position, a driving mechanism for moving the needle between the two positions, and an ink attracting unit for generating a magnetic or electric field in the slit, thereby attracting the ink from the ink tank into the slit to cause the ink to attach to the distal end portion of the needle located in the rest position, the ink attracting unit being adapted to generate an ink attracting magnetic or electric force of a necessary intensity for the ink to be attracted from the ink tank into the slit at the time of ink attraction, and to generate an ink holding magnetic or electric field of a minimum necessary intensity for a predetermined amount of ink to be held in the slit after the predetermined amount of ink is attracted into the slit, wherein the ink attaching to the distal end portion at the rest position is moved to the recording sheet to form an ink dot thereon as the needle moves to approach the recording sheet in a projected position.

REFERENCES:
patent: 4552472 (1985-11-01), Tsuge et al.
patent: 4553865 (1985-11-01), Ikeda et al.

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