Printing mechanism for dot matrix impact printers

Details Printing mechanism for dot matrix impact printers Printing mechanism for dot matrix impact printers

1979-09-20

1981-04-28

Sewell, Paul T.

Printing

Selective or progressive

Bed and platen machines

400121, 346101, B41J 308

Patent

active

042638470

ABSTRACT:
A dot matrix impact printer of the type which has a platen having a helical projection, a plurality of hammers arranged in the axial direction of the platen to cross the helical projection, and means for feeding an ink to the periphery of the helical projection. The platen is rotated and the hammer strikes the helical projection interposing the recording paper, so that dot matrix printing may be performed. In order to prevent the contamination of the recording paper with the ink, there is provided a separating member of resilient material along the helical projection. The periphery of the separating member is slightly higher than the helical projection, so that the recording paper is separated from the helical projection. The separating member is compressed by impacting the hammer so that the ink may be transferred to the paper.

REFERENCES:
patent: 3810195 (1974-05-01), Kilroy et al.
patent: 3812495 (1974-05-01), Venker
patent: 3834304 (1974-09-01), Potter
patent: 3843955 (1974-10-01), Pear
patent: 4164744 (1979-08-01), Freude
"Porous Coating For Type Element", by E. J. Bonafino, et al., IBM Tech. Disc. Bulletin, vol. 15, No. 4, Sep. 1972, p. 1290, 400-470.

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