Abstract: A method of preventing clogging of nozzles, particularly nozzle orifices in a drop-on-demand ink jet printers, during intervals when no ink flows through the nozzles, e.g. during non-printing intervals, when using an ink composition intended for recording permanent information on essentially non-absorbent surfaces. The ink composition is made up of a solvent, a non- or low-volatile fraction and a colorant. The relative quantities and solubility of the constituents are selected such that when printing terminates and a portion of the solvent evaporates at the nozzle orifice, a concentration of colorant and less volatile fraction builds up in the region of the nozzle orifice. This causes the colorant to migrate to an environment in which its affinity is greater, i.e. further within the nozzle.

Abstract: Methods of coating piezoelectric substrates with substantially uniform layers of a semi-conducting material are disclosed including placing the substrate in a heated deposition chamber at reduced pressure and depositing a layer of semiconducting material on the substrate by thermally activated chemical vapor deposition, including admitting a gas bearing the semi-conducting material into the chamber at a pressure of between about 13 and 200 Pa and a temperature of between about 300.degree. and 700.degree.C. so that a layer of semi-conducting material having a desired smoothness is obtained.

Abstract: Device for printers using pressurized fluid medium for recording characters on an information carrier. The device is formed with at least one buffer chamber placed in direct connection with a fluid chamber, which constitutes one side of a wall or plate provided with a discharge. The buffer chamber includes an elastic or at least flexible dividing wall between the fluid chamber and the buffer chamber. The buffer chamber has a relatively small volume and is closed and, in one embodiment, is such that it allows penetration or migration of gas molecules only through the dividing wall.

Abstract: A valve device for matrix printers of the ink jet type.The device is arranged for providing a liquid tight closure and opening of a passage for generating a portion of a character by the output of a certain amount of liquid for character recording through said passage.Armatures, each one having an end portion are arranged as valve bodies in the passages, and means are arranged for operating the armatures in a reciprocating movement for obtaining said closure and opening functions.A plate shaped element is the element wherein the passages are formed and comprises a grindable element, which is such that it is grindable to a smooth condition with long term smoothness and generally free from internal strains.The end portion or valve head of each armature has at least partially a smooth surface arranged for being directly brought into abutment against the smooth grinded element, around the opening of the passage facing the armature.

Abstract: A device for recording of information in the form of characters or symbols onto an information carrier. A recording device of the matrix type (13) is rotatable around an axis perpendicular to a column of the matrix.The recording device is arranged for relative movement relative the actual information carrier and means are arranged for actuating the matrix for information recording in the movement direction dependent on the angle between a matrix column and the movement direction.A sensor arrangement is rotatable together with the matrix column and has means for detecting of at least the parameters relative movement direction, relative speed and said angle.A single processing unit is arranged for controlling the character recording in said predetermined manner dependent on said parameters.

Abstract: An electro mechanic valve device for an ink jet printer comprising at least two valves arranged in a valve housing. Each valve is associated with a magnet core having a winding and a valve pipe having a valve armature and a counter armature. The windings at adjacent magnet cores are arranged alternatingly, a first one at one side of the row of valve pipes and the next one at the opposite side.