Concave impact print hammers

Details Concave impact print hammers Concave impact print hammers

1977-06-10

1979-01-16

Coven, Edward M.

Printing

Selective or progressive

Bed and platen machines

101 9314, 101 9348, 101111, B41J 912

Patent

active

041343379

ABSTRACT:
Print smearing observed in double wide hammers can be controlled and reduced by providing the impact face of the print hammer with a concave cylindrical radius of curvature wherein the cylindrical axis is parallel to the vertical font direction. The radius of curvature is chosen according to impact energy and font velocities. In other embodiments, the timing of impact between the hammer and font characters may be offset such that the center of the print column leads the center of the impact hammer at the time of impact. In another embodiment, the radius of cylindrical curvature may be ground off center from the center line of the print hammer by a predetermined offset.

REFERENCES:
patent: 3604347 (1971-09-01), Muterspan
patent: 3850097 (1974-11-01), Sweeney
patent: 3967551 (1976-07-01), Matsubara et al.
patent: 3981236 (1976-09-01), Johnston et al.
patent: 3994219 (1976-11-01), Yasuda et al.
Bogaczyk et al., IBM Tech. Disclosure Bulletin, vol. 17, No. 5, 10/1974, p. 1317.

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