Magnetic ink dot printer with means for controlling print densit

Details Magnetic ink dot printer with means for controlling print densit Magnetic ink dot printer with means for controlling print densit

1984-06-05

1986-07-08

Goldberg, E. A.

Recorders

Markers and/or driving means therefor

With ink supply to marker

400124, G01D 1516

Patent

active

045996296

ABSTRACT:
An ink dot printer includes an ink tank for storing magnetic ink, a pair of magnetic pole plates arranged opposite to each other to form a slit, one end of the pair of plates being immersed in the magnetic ink in the ink tank. An electromagnet magnetizes the paired magnetic pole plates to introduce the magnetic ink in the ink tank into the slit to form a magnetic ink film therein, and a plurality of needles arranged adjacent to one another in the longitudinal direction of the slit are each freely movable in the longitudinal direction of the needle between a first position where its one end portion is immersed in the magnetic ink film in the slit between the paired magnetic pole plates and a second position where its one end portion is projected from the magnetic ink film in the slit. An electromagnet selectively drives the needles to move them from the first to the second position, and a variable resistance controls the strength of magnetic force generated by the electromagnet by controlling the voltage supplied to the electromagnet. Magnetic ink, which has been stuck to the one ends of the needles at the first position, is forced onto a recording paper at the second position to form dots of magnetic ink of controlled density. By the gathering of the dots, symbols such as characters and numerals are printed.

REFERENCES:
patent: 4315267 (1982-02-01), Sonoda et al.
patent: 4359752 (1982-11-01), Nakagawa et al.

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