Recorders – Record receiver deforming
Patent
1979-02-27
1981-02-03
Hartary, Joseph W.
Recorders
Record receiver deforming
G01D 1518
Patent
active
042491886
ABSTRACT:
A method of controlling the impact points of successive selected droplets in a particular ink stream operating on a drum type printer capable of controlling uncharged non-magnetic droplets, as described in U.S. Pat. No. 4,138,686 is disclosed. Further the grid formed by any single stream can be made rectangular with one axis parallel to the direction of motion of the output medium relative to the droplet selector, to facilitate the simultaneous formation of properly oriented print characters. Phase and speed of contacting droplets relative to sites uniformly spaced around a rotating drum are sensed and controlled in a new way.
Also an impacting sequence to produce a line of upright characters with the sequence to be reversed if the line is traversed in the opposite direction is disclosed. A method for producing both the sequence and the reverse sequence using a single droplet stream whose origin moves parallel to the line of characters, and whose droplet velocities are controllably changed only in a single plane, which plane contains the velocity of each controlled droplet with respect to the droplet stream origin, the same plane being used for all impacting droplets whether in sequence or reverse sequence, is shown. In other words, neglecting gravity and aerodynamics all image droplet velocities are controllably rotated about a single vector in space.
Also an impacting sequence to produce a rectangular array of impact points more closely spaced in both array directions than the actual simultaneous impact points, while all impact points relative to the droplet selector remain in a constant position, is disclosed, i.e. the droplet stream directions need not be controlled.
REFERENCES:
patent: 3769624 (1973-10-01), Lee
patent: 3787882 (1974-01-01), Fillmore
patent: 3893623 (1975-07-01), Toupin
patent: 4023183 (1977-05-01), Takano
patent: 4059183 (1977-11-01), Hoskins
patent: 4075636 (1978-02-01), Galetto
patent: 4091390 (1978-05-01), Smith
patent: 4138686 (1979-02-01), Graf
Fan et al.; Drop Shutter for Ink Jet Printing; IBM Tech. Disc. Bulletin, vol. 16, No. 3, Aug. 1973, p. 989. _
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