Hammer driver controller for impact printers

Details Hammer driver controller for impact printers Hammer driver controller for impact printers

1975-10-15

1977-12-13

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101 9303, 101 9348, B41J 942

Patent

active

040622851

ABSTRACT:
To obtain a substantially uniform print density while printing at high speed with a hammer-type impact printer, the hammer is electromagnetically driven in response to an energizing current which decays with a predetermined time constant from a high initial level toward a set point level which is automatically adjusted for different classes of characters so that the impact energy imparted to the hammer is regulated as a function of the character being printed. To adaptively absorb the shock forces generated by the rebounding hammer, the energizing current for the electromagnetic driver is reduced to a predetermined fraction of the set point level.

REFERENCES:
patent: 3172353 (1965-03-01), Helms
patent: 3335659 (1967-08-01), Schacht et al.
patent: 3507213 (1970-04-01), Derc
patent: 3678847 (1972-07-01), Pear et al.
patent: 3741113 (1973-06-01), Mako et al.
patent: 3760925 (1973-09-01), Bossi
IBM Technical Disclosure Bulletin, J. D. Engles, vol. 1, No. 4, Dec., 1958, p. 44.

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