摘要:
An ink jet apparatus having a scanning head employing at least one ink jet with a variable volume chamber which includes an ink droplet ejecting orifice, and a transducer, having a length mode resonant frequency, adapted to expand and contract along an axis of elongation in response to an electric field substantially transverse to the axis of elongation for ejection of droplets on demand from the ink droplet ejecting orifice is acoustically microstreamed by exciting the transducers during non-printing periods to eliminate start-up problems and to maintain pigments or other particles in dispersion within the ink.
摘要:
An improved dot matrix actuator is provided which includes a magnetic circuit formed of a yoke assembly and a pivotal armature. The armature is pivotally supported with respect to the yoke by means of a flexure assembly which eliminates the need for a true pivot between the two elements. The elements are shaped so as to maintain a constant small air gap therebetween so as to maximize the magnetic efficiency of the device while eliminating wear. The device is operated just below saturation of the magnetic circuit in order to maximize efficiency. In addition, the actuator includes several features for maximizing its speed and operational efficiency.
摘要:
For both reducing the ligament length and satellite droplet problems associated with producing high velocity ink droplets from an ink jet head printing at relatively high ink jet head-transport speeds, the ink jet head is driven by composite waveform including independent and successive first, second, and third electrical pulses (332,334,336), each having an exponential leading edge and a step-like trailing edge, the pulses having amplitudes, pulse widths (T 1 ,T 3 ,T 5 ), and dead times (T 2 ,T 4 ) between pulses, for causing the ink jet head to eject three successive ink droplets, each of increased velocity (V,, V 2 , V 3 ) relative to the preceding droplet, for causing the droplets to merge in flight to form a single or ultimate droplet (344) having a predetermined velocity (V4).
摘要:
Ink jet apparatus includes a reservoir (14) and ink jet (12) thermally coupled to a heater the ink jet and reservoir each consisting of a material having a thermal conductivity of at least 0.03 g cal/sec cm 2 (°C/cm).
摘要:
(57) An ink jet apparatus has a manifold (39) and a matched feed tube (37,38) connecting the manifold with an ink reservoir (40) so as to effectively present the large compliance characteristic of the reservoir at the manifold, thereby enabling a reduced volume print head construction which efficiently reduces cross talk and vibrational problems.