摘要:
An ink jet droplet exciter for generating pressure waves in a droplet generator. The preferred exciter is a composite made of PZT, Pb (Zr:Ti) O.sub.3, and a polyethylene supporting material. The mean diameter of the PZT particles is 7 mils and the entire exciter thickness is between 10 and 12 mils. The composite is pliable and can be made in sheets of a large enough area to provide droplet excitation for a multiple nozzle generator.
摘要:
A continuous liquid drop generator and a printing system employing it are disclosed. The generator includes a thin cavity which contains liquid under pressure. The liquid is emitted through a nozzle as a liquid column from which drops are formed. The liquid in the cavity is acoustically stimulated by a thin, flexible piezoelectric exciter. Polyvinylidene fluoride (PVF.sub.2) is one piezoelectric material disclosed. The thin body generator includes a transmission plate or block between a backing plate and a nozzle plate. The transmission plate chemically protects the exciter and provides space for an infeed conduit that couples a liquid to the thin cavity. The generator design is especially suited for multiple-nozzle drop generators. One printing system disclosed employs a multiple nozzle generator with each nozzle addressing drops to multiple pixels within a segment of a scan line. Collectively, the drop streams emitted from the multiple nozzles are able to compose a full scan line on a target. The target moves relative to the drop generator.
摘要:
A plurality of ink droplet issuance units are provided for emitting plural streams of ink droplets toward a record receiving paper. The ink droplets in the respective streams are charged by a bi-valued signal through the use of a plurality of charging means in accordance with print information. The ink droplets charged by one value of the bi-valued signal are deflected as they pass through a deflection means and deposited on the record receiving paper. The ink droplets charged by the other value of the bi-valued signal are directed to a beam gutter and not deposited on the record receiving paper. In this way, one column of a dot matrix pattern is printed at a time utilizing plural streams of ink droplets.
摘要:
Apparatus and method for generating drops in a continuous falling curtain by controlled stimulation of a set of fluid streams. The streams are formed by forcing a working fluid under pressure through a set of orifices in an orifice plate, and are stimulated to produce drops by propagating a series of bending waves down the length of the plate. It is shown that this method of stimulation provides regulation of the phase and amplitude of applied stimulation energy and accurately controls the filament length of all streams. There is also disclosed an improved jet drop recording apparatus wherein graphic printing quality is greatly improved by travelling wave stimulation of a set of digitally switched jets.
摘要:
A microfluidic device for continuous ejection of fluids includes: a semiconductor body that laterally delimits chambers; an intermediate structure which forms membranes each delimiting a top of a corresponding chamber; and a nozzle body which overlies the intermediate structure. The device includes, for each chamber: a corresponding piezoelectric actuator; a supply channel which traverses the intermediate structure and communicates with the chamber; and a nozzle which traverses the nozzle body and communicates with the supply channel. Each actuator is configured to operate i) in a resting condition such that the pressure of a fluid within the corresponding chamber causes the fluid to pass through the supply channel and become ejected from the nozzle as a continuous stream, and ii) in an active condition, where it causes a deformation of the corresponding membrane and a consequent variation of the pressure of the fluid, causing a temporary interruption of the continuous stream.
摘要:
Building panels, especially laminated floor panels are shown, which are provided with a locking system and several core grooves at the rear side in order to save material and decrease weight. Building panels, each having a surface layer on a front side, a backing layer on a rear side and an intermediate core, wherein the intermediate core and the surface and the backing layer all comprise wood fibres and thermosetting resins, the building panels are provided with a locking system for vertical and horizontal locking of a first edge of a first building panel to an adjacent second edge of a second building panel.
摘要:
Provided is a sealing member to be used as a valve in a pressure adjustment mechanism. The sealing member includes a base member having high strength, and has high reliability. The sealing member includes an elastic member (valve portion) having an annular abutment portion (valve distal end portion) formed as an annular protrusion and the base member (lever portion). When a held portion having a tubular shape extending from the annular abutment portion is held in an annular groove formed in the base member, the elastic member is fixed to the base member. A holding length over which an annular groove holds the held portion along a depth direction of the base member is set longer than a width of the annular groove.
摘要:
Methods for printing using printing systems comprising a flexible intermediate transfer member (ITM) disposed around a plurality of guide rollers at which encoders are installed, and an image-forming station at which ink images are formed by droplet deposition by print bars onto the ITM, can include measuring a local velocity of the ITM under one of the print bars, determining a stretch factor for a portion of the ITM based on a relationship between an estimated stretched length fixed physical distance between print bars, controlling an ink deposition parameter according to the stretch factor so as to compensate for stretching of the reference portion of the ITM.
摘要:
A microfluidic device for continuous ejection of fluids includes: a semiconductor body that laterally delimits chambers; an intermediate structure which forms membranes each delimiting a top of a corresponding chamber; and a nozzle body which overlies the intermediate structure. The device includes, for each chamber: a corresponding piezoelectric actuator; a supply channel which traverses the intermediate structure and communicates with the chamber; and a nozzle which traverses the nozzle body and communicates with the supply channel. Each actuator is configured to operate i) in a resting condition such that the pressure of a fluid within the corresponding chamber causes the fluid to pass through the supply channel and become ejected from the nozzle as a continuous stream, and ii) in an active condition, where it causes a deformation of the corresponding membrane and a consequent variation of the pressure of the fluid, causing a temporary interruption of the continuous stream.
摘要:
A liquid discharge method of discharging a liquid from a nozzle of a liquid discharge head by applying a drive pulse to a drive element of the liquid discharge head includes an acquisition step of acquiring a recording condition including a first discharge characteristic and a second discharge characteristic of the liquid from the liquid discharge head, a determination step of determining the drive pulse to be applied to the drive element, based on the recording condition, and a driving step of applying the drive pulse determined in the determination step to the drive element. In the liquid discharge method, in the determination step, the drive pulse is determined by a determination method subjected to weighting in which a weight of the first discharge characteristic is greater than a weight of the second discharge characteristic.