International Business Machines Corporation

Donald Frederick Jensen

John Carl Tamulis

Ho Chong Lee

Jack Louis Zable

Louis V Galetto

Charles O Ross

Thomas Tomasky

Arnold B Rosenthal

In a magnetic ink jet printer a continuous stream of ferrofluid ink drops is projected toward a print medium. A magnetic selector located proximate the stream is operated in synchronism with the flight of the ink drops for deflecting individual unwanted ink drops into a drop catcher. Due to fringing effects produced by the selector when unwanted drops are selected, adjacent print drops are deflected a lesser amount from the initial stream trajectory. Print drops not affected by the fringe magnetic field produced to select unwanted drops are subjected to a compensation deflection depending on their position relative to the unwanted drops so that all print drops follow the same trajectory, after passing the magnetic selector in their travel through a vertical deflector and deposition onto the print medium.

Ink jet printer apparatus and method of operation

In a serial printer a movable type character element such as a ball, disc or the like is rotated to present different type characters to the print position. The carrier for the type element is moved along the print line at a predetermined maximum velocity so long as it is possible to move the type element to the next character in time required to move the carrier from one print position to the next. If the type character set-up time is greater, the carrier is run at a slower speed and is then returned to the predetermined velocity for printing.

Carrier traverse control for a serial printer

In an ink jet printer, drops are generated at a test frequency which is a harmonic of the drop generation rate for printing. If an error in velocity is detected at the test frequency, a coarse correction velocity is made to bring the correct number of drops within the range of one-half the wavelength at the nth drop location relative to a drop detector. Drops are then generated at the printing frequency and a fine correction in the velocity is made if a velocity error is detected.

Method and apparatus for controlling the velocity of ink drops in an ink

A line printer has a print head with plural nozzles arranged in a single row generally transverse to the direction of relative motion of the print head and a print medium. The nozzles are spaced plural dot positions from each other corresponding to a plural dot segment of a single dot matrix character stroke. When the row of nozzles is slanted relative to the direction of motion, drops from the nozzles are used to print stroke segments in plural character strokes simultaneously.

Multi-nozzle ink jet printer and method of printing

An ink jet printer prints dot matrix characters by removing unwanted drops from a sequence of uniformly spaced drops in an ink jet stream and subjecting the remaining print drops to a vertical raster deflection in timed relation with relative horizontal motion of the jet stream and a record medium. Selected print drops are individually deflected fractional amounts in either the horizontal or vertical direction prior to the vertical raster deflection to cause the selected print drops to be deposited at positions intermediate the coordinate intercepts of a rectilinear matrix pattern to cause dot matrix characters to be printed with arcuate line segments and various angles corresponding with conventional character shapes.

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Endicott, NY, United States of America

Donald Frederick Jensen