Fred A Howell

US Patent:

41224590, Oct 24, 1978

Filed:

Jul 18, 1977

Appl. No.:

5/816554

Inventors:

Ernst F.R.A. Schloemann - Weston MA
Fred M. Howell - Barrington RI

Assignee:

Raytheon Company - Lexington MA

International Classification:

G01D 1512

US Classification:

346140R

Abstract:

An ink feed system for an electrophoretic printer wherein a ribbon is used to carry ink from an ink supply to the paper upon which it is applied by means of an electric field. A magnetic constituent is added to the ink and a magnetic field is impressed alongside the ribbon and parallel to the surface thereof. A Hall probe positioned in the magnetic field senses perturbations thereof perpendicular to the ribbon induced by the presence of ink on the ribbon. A signal produced by the Hall probe signals the density of the ink upon the ribbon and is utilized for regulating a flow of ink onto the ribbon.

US Patent:

44445199, Apr 24, 1984

Filed:

Mar 9, 1982

Appl. No.:

6/356320

Inventors:

Fred M. Howell - Amherst NH
Theodore J. Goodlander - Nashua NH
Duarte M. Brazao - Nashua NH

International Classification:

B41J 354
B41J 312
B41J 130

US Classification:

400 82

Abstract:

A printer capable of operation as a dot matrix printer, and, alternatively, as a daisy wheel printer, the printer including the carriage providing for the mounting of a daisy wheel and associated hammer solenoid or a dot matrix printhead, the carriage including a diasy wheel drive mechanism and means for automatically selecting a mode of operation consistent with the mode of printing desired.