Printing – Selective or progressive – Bed and platen machines
Patent
1976-10-12
1978-10-24
Coven, Edward M.
Printing
Selective or progressive
Bed and platen machines
101 9348, 335266, B41U 930
Patent
active
041215184
ABSTRACT:
A high speed printer is provided having a plurality of aligned hammer assemblies for directing hammers at a moving character band for printing characters responsive to the hammer's driving against the character band. The hammer assembly has a striker arm pivotly mounted to a striker assembly frame and which acts as an armature when driven by a pair of magnets. The magnets are attached to the striker assembly frame on opposite sides of the striker arm and on opposite sides of the pivot point for the striker arm so that simultaneously actuating both magnets pulls the striker arm for actuating the hammer. Each magnet has a single coil, with one of the magnets having a reverse polarity from each adjacent magnet on an adjacent assembly, while the other magnet has the same polarity to avoid cross-talk and to increase the speed of the printer. A pressure-sensitive tape is bonded to the striker armature to provide a residual air gap between the armature and magnet poles and improvements are made in the hammer guide combs, return plunger, and the platen.
REFERENCES:
patent: 2671863 (1954-03-01), Matthews
patent: 2997632 (1961-08-01), Shepard
patent: 3102974 (1963-09-01), Williams
patent: 3266418 (1966-08-01), Russo
patent: 3285165 (1966-11-01), Richter
patent: 3629755 (1971-12-01), Schaller
patent: 3633500 (1972-01-01), Edwards
patent: 3636865 (1972-01-01), Konkel et al.
patent: 3919933 (1975-11-01), Potter
Halbert Silas Ray
Prior Arthur D.
Ward Leonard G.
Coven Edward M.
Documation Incorporated
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