Recorders – Record receiver deforming
Patent
1982-09-28
1985-06-11
Hartary, Joseph W.
Recorders
Record receiver deforming
239 4, 239102, 331 78, 346 11, G01D 1518
Patent
active
045232024
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
This invention relates to the field of non-contact fluid marking devices which are commonly known as "ink jet" devices.
THE PRIOR ART
Ink jet devices are shown generally in U.S. Pat. No. 3,373,437, issued Mar. 12, 1968, to Sweet & Cumming: No. 3,560,988, issued Feb. 2, 1971 to Krick; No. 3,579,721, issued May 25, 1971 to Kaltenbach; and No. 3,596,275, to Sweet, issued July 27, 1971. In all of those devices, jets (very narrow streams) are created by forcing a supply of recording fluid or ink from a manifold through a series of fine orifices or nozzles. The chamber which contains the ink or the orifices by which the jets are formed are vibrated or "stimulated" so that the jets break up into droplets of uniform size and regular spacing. Each stream of drops is formed in proximity to an associated selective charging electrode which establishes electrical charges on the drops as they are formed. The flight of the drops to a receiving substrate is controlled by interaction with an electrostatic deflection field through which the drops pass, which selectively deflects them in a trajectory toward the substrate, or to an ink collection and recirculation apparatus (commonly called a "gutter") which prevents them from contacting the substrate.
While it has been known that a fine liquid jet will break into discrete droplets under its inherent thermal and acoustic motion even in the absence of any external perturbations, it has heretofore generally been believed that specifically calibrated separate perturbation at or near the natural frequency of drop formation was a practical necessity to produce droplets that are regularly spaced, sized, and timed across the orifice array to permit proper use of the apparatus. Printing with charged drops requires relatively precise control of the droplet paths to the ultimate positions on the receiving substrate, and drop size, spacing, and charge level have generally been regarded as critical factors. Thus, Sweet requires perturbation means for assuring that droplets in the stream are spaced at regular intervals and are uniform in size.
As noted in Sweet, the stream has a natural tendency, due at least in part to the surface tension of the fluid, to break up into a succession of droplets. However, as is easily observed in a jet of water squirted through a garden hose nozzle, the droplets are ordinarily not uniform as to dimension or frequency. In order to assure that the droplets will be substantially uniform in dimension and frequency, Sweet provides means for introducing what he refers to as "regularly spaced varicosities" in the stream. These varicosities create undulations in the cross-sectional dimension of the jet stream issuing from the nozzle. They are made to occur at or near the natural frequency of formation of the droplets. As in Sweet, this frequency may be typically on the order of 120,000 cycles per second.
A wide variety of varicosity inducing means are now known in the art. For example, Krick utilizes a supersonic vibrator in the piping through which ink is fed from the source to the apparatus; and in Kaltenbach, the ink is ejected through orifices formed in a perforated plate which is vibrated continuously at a resonant frequency.
Since the advent of the Sweet approach, non-contact marking devices utilizing fluid droplet streams have become commercially developed. However, so far as is known to me, it has been a characteristic of ink jet devices that all of them utilize some type of varicosity inducing means or "stimulator" to induce regular vibrations into the stream to provide regularity and uniformity of the droplets.
As noted in Stoneburner U.S. Pat. No. 3,882,508, issued May 6, 1975, proper stimulation has been one of the most difficult problems in the operation of jet drop recorders. For high quality recording it has been necessary that all jets be stimulated at the same frequency and with very nearly the same power to cause break-up of all the streams into uniformly sized and regularly spaced drops.
Furthermore, it is necessary th
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Burlington Industries Inc.
Hartary Joseph W.
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