Electrostatic clutch-operated printing mechanism

Details Electrostatic clutch-operated printing mechanism Electrostatic clutch-operated printing mechanism

1980-12-31

1983-07-19

Burr, Edgar S.

Printing

Selective or progressive

Bed and platen machines

101 9331, 101 9348, 192 84E, B41J 910, B41J 932, B41J 936

Patent

active

043937691

ABSTRACT:
An impact printing mechanism is disclosed having an electrostatic clutch assembly, including a rotatively mounted semiconductive coated drum and a conductive band wrapped around the circumference thereof. The printing mechanism includes a printing hammer and a print spring for actuating the printing hammer. When a print command is issued, a voltage is applied to the band to create a field between the band and the drum coating. An electrostatic force is therefore generated when the drum is rotating slowly or synchronous with the drum step motion. That motion will pull the band and compress the print spring. The potential energy stored in the spring is then ready to fire the hammer. A hammer firing command turns off the voltage pulse and discharges the field, releasing the electrostatic holding force instantaneously and firing the hammer by the compressed spring.

REFERENCES:
patent: 2850907 (1958-09-01), Foster
patent: 2850908 (1958-09-01), Foster
patent: 2909996 (1959-10-01), Fitch
patent: 2916920 (1959-12-01), Planer et al.
patent: 3002596 (1961-10-01), Fitch
patent: 3199650 (1965-10-01), Brown et al.
patent: 3655019 (1972-04-01), Trzaska
patent: 3804009 (1974-04-01), Blume
patent: 3878778 (1975-04-01), Gromi

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