Abstract: A method of operating a system for jetting phase change ink by effecting a solid-to-liquid phase transition of the ink by elevating its temperature, ejecting a first volume of liquid ink towards a target, lowering the temperature of the ejected ink to cause it to solidify after contact with the target and then contacting the first volume of ink with a second volume of similarly jetted ink in a liquid state so that the second volume lies on the first volume. Thereafter, the second volume of ink is caused to undergo a liquid-to-solid transition by lowering its temperature. By this method, the height of printed material is built up.

Abstract: A method of operating a system for jetting phase change ink comprises effecting a solid to liquid phase transition of the ink by elevating its temperature, ejecting a first volume of liquid ink towards a target, lowering the temperature of the ejected ink to cause it to solidify after contact with the target and the contacting the first volume of ink with a second volume of similarly jetted ink in a liquid state so that the two volumes are superimposed. Thereafter, the second volume of ink is caused to undergo a liquid to solid transition by lowering its temperature.

Abstract: A rotary ink jet printer can print at high speed in black and white as well as in color using hot-melt inks. The printer includes a rotary print wheel which supports a plurality of ink jetters distributed around its periphery. The jetters are divided into color groups with the jetters in each group drawing ink from a separate chamber of an ink reservoir with the different chambers containing different-colored inks. Each jetter can be aimed separately from all of the other jetters in the print wheel in a direction parallel to the rotary axis of the wheel as well as in a direction perpendicular thereto and tangent to the print wheel, enabling the jetters in the different groups during each revolution of the print wheel to print in a plurality of colors on a plurality of different lines of a recording medium advancing as a cylinder past the periphery of the print head. A mechanism for automatically aiming the jetters on the print wheel is also disclosed.

Abstract: A logic network and method for processing columns of vertically oriented imaging data bits to produce control signals for operating a linearly slanted print head, includes writing different equal byte segments of each such column into a RAM memory while pre-skewing successive bytes, respectively, from one another by the equivalent of the number of columns of print resolution capability between successive print elements of the print head represented by each byte. Thereafter, skewing of the imaging data bits is completed during readout from memory, by fetching in columnar order the bits required for operating the print elements to print the image data under the print head during a given print cycle.