Printing – Selective or progressive – Bed and platen machines
Patent
1974-12-16
1976-12-14
Coven, Edward M.
Printing
Selective or progressive
Bed and platen machines
B41J 936
Patent
active
039968529
ABSTRACT:
The line printer comprises a main frame; a type-carrying drum mounted in said main frame for selective rotation and a plurality of rows of the type supported in the periphery of said drum; a plurality of typewriting hammers pivoted to said main frame adjacent to said drum for effecting a typewriting operation in cooperation with the drum; a subframe assembly adjustably secured to said main frame, said subframe assembly comprising a subframe adjustably secured to said main frame, a plurality of selector levers pivoted to the subframe by means of a common lever shaft in association with said hammers, respectively, a plurality of drive levers pivoted to said selector levers respectively, said drive levers being so spring-loaded that when said selector levers are pivoted in one direction against spring force, the drive levers engage said cam shaft to be operated thereby so as to engage said hammers to cause the hammers to strike against said drum for effecting a typewriting operation in cooperation with the drum, but the drive levers are normally subjected to spring force so as to bias said selector levers in the direction opposite to said one direction, a plurality of selector magnets provided on said subframe adjacent to said selector levers and a plurality of iron pieces connected to said selector levers, respectively, to be attracted by said magnets so as to pivot the selector levers in said one direction, respectively; and a typewriting operation control circuit for selectively energizing said magnets so as to effect the typewriting operation.
REFERENCES:
patent: 2893313 (1959-07-01), Pekar et al.
patent: 3587456 (1971-06-01), Jaensch
patent: 3673956 (1972-07-01), Huber et al.
patent: 3726213 (1973-04-01), Herbert
patent: 3823667 (1974-07-01), Babler
patent: 3832942 (1974-09-01), Murayoshi
Copal Company Limited
Coven Edward M.
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