Magnetic interference prevention system

Details Magnetic interference prevention system Magnetic interference prevention system

1979-08-23

1981-07-14

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101 9314, 101 9303, 361191, B41J 938

Patent

active

042780217

ABSTRACT:
A printing device having a plurality of print hammers having striking surfaces arranged along a print line and print magnets provided adjacent to one another for driving the printing hammers. A magnetic interference preventing device comprises a memory for storing for each column the excitation lapse time information of the print magnets. A reader which, when exciting each print magnet is started, reads the excitation lapse time information of both print magnets adjacent to each print magnet out of the memory. The reader outputs a signal only when the excitation lapse times of both print magnets are in a predetermined range of time. An inhibitor is used for inhibiting the excitation of each print magnet when the excitation lapse times of both print magnets are within the predetermined range of time.

REFERENCES:
patent: 3633496 (1972-01-01), Kearns
patent: 3855923 (1974-12-01), Foley
patent: 3899968 (1975-08-01), McDevitt
patent: 3952648 (1976-04-01), Sery et al.
Blythe et al., IBM Tech. Discl. Bulletin, vol. 20, No. 4, Sep. 1977, pp. 1319-1320.
Gregory et al., IBM Tech. Discl. Bulletin, vol. 20, No. 1, Jun. 1977, pp. 90-95.

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