Abstract: An ink jet printer is provided with an ink reservoir including a laminar substrate covered on the outer surface of a plurality of metal coatings forming individual electrodes associated with a plurality of nozzles. These latter are formed of holes passing through the substrate and the coatings. An additional metal coating is provided in the inner surface of the substrate and includes a portion to provide a common electrode and a plurality of portions connected with the coatings of the outer surface. The reservoir has a chamber for the evacuation of gases which form during the printing operation, the chamber having an associated Venturi pump acting as a vacuum source.The electrical energization circuit for the printer includes an adjustment member for effecting controlled variation in the energy of the pulses which cause the ejection of ink sprays through the printer nozzles.

Abstract: A thermal head comprising heating resistors with their temperature coefficient of resistance being negative at normal temperature and invertible to be positive as the temperature rises.

Abstract: The present invention relates to a cassette-type printing head which comprises in combination: a cassette body for housing an ink, an ink guiding member in which one end portion thereof is immersed in the cassette body, and a film member having a plurality of holes or recesses for housing an ink which is contacted by the ink guiding member which protrudes from the cassette body.

Abstract: The present apparatus concerns round monitoring and includes a portable recording device together with a plurality of keys for indicating different locations through which a watchman is to pass. In order to simplify the drive mechanism of the apparatus, the apparatus comprises a clock movement (20) having an hours shaft on which a disk (34) is mounted having time data print elements (36) disposed around its rear face. A strip of paper (50) is displaced between said print elements (34) and a print hammer (52).

Abstract: A method for recording images on a recording material by ejection of recording liquid through fine nozzle or nozzles, characterized in that said recording liquid is a liquid composition containing therein water-soluble dyestuff, and that concentration of calcium ion in said liquid composition is adjusted to 10 ppm or below.

Abstract: A high density printer includes a printing plate having an array of through holes of capillary dimension, and individual heaters located within each hole near one face of the printing plate, whereby printing is accomplished by placing the other face of the printing plate in contact with a pool of liquified phase change ink for a period of time sufficient to allow ink to fill each hole via capillary action, after which time the printing plate is removed from the ink and allowed to cool for solidifying the ink within each hole, whereafter selective ones of the heaters are energized for melting ink in associated holes, whereupon the ink expands away from the solidified ink in the portions of the holes below the heaters, causing ink to protrude from the associated holes on the one face in a desired pattern for transfer to a substrate brought into intimate contact with the one face.

Abstract: A multi-pen recording device including a carriage holding a number of pens and movable on a shaft over a writing surface, a single plunger provided for selectively urging a selected individual pen against the writing surface, a belt for driving the carriage attached to the carriage, a clutch provided on the carriage for transmitting the drive force of the belt to the plunger and for releasing the same, whereby the drive force of the belt is used as the drive force for the pen selection and is used as a single plunger for urging a pen against the writing surface which eliminates the need for a special drive source for changing over the plunger toward the respective pens.

Abstract: An optical image bar having a spatial light modulator includes means for decomposing the spatially modulated output radiation of the modulator into a plurality of mutually orthogonal, laterally offset, redundantly modulated, optical field distributions for producing an essentially null-free image, without significantly affecting the resolution of the image bar.

Abstract: An improved carriage assembly for use in ink jet printers is provided. The present ink jet printer carriage assembly includes a holder for holding an ink droplet projection nozzle and a charging electrode for charging ink droplets and the holder is so structured that it may be pivoted vertically as well as horizontally. Thus the ink jet projection direction may be adjusted with respect to its pitch direction as well as yaw direction. A deflection stage including a pair of oppositely arranged deflector electrodes is fixedly mounted on the carriage body; however, a gutter for collecting non-deflected ink droplets is adjustably provided. With such a structure, the whole assembly may be constructed quite with ease since minor mismatches may be corrected after assemblage; moreover, printed characters or images of excellent quality may be obtained.

Abstract: An electroacoustic simulation method and apparatus for imitating electroastically the human outer ear having transmission properties corresponding to those of the human outer ear when exposed to sound in the free field is proposed, wherein the physical acoustical causes of the outer ear, the head, the upper part of the body, the pinna rim, and the like, are represented mathematically by simple partial models and approximated in the form of electric circuits containing circuit elements such as high-pass filters, low-pass filters, all-pass filters . . . and the like, with the possibility to vary certain properties of the circuit elements continuously by varying the parameters so that arbitrary directions of sound incidence can be adjusted infinitely in the horizontal and median planes.

Abstract: A vibration preventing device in an intermittent driving mechanism for intermittently operating a driven member having a specified mass with a motor, includes an elastic body interposed between an operating member and a stationary member facing thereto which are disposed in a motor power transmission system, and a friction surface formed between the elastic body and the operating member or between the elastic body and the stationary member, whereby at the time of starting the motor, the load on rotation of the motor is gradually increased by elastic deformation of the elastic body.

Abstract: A method for purging impurities from the ink path from a drop-on-demand ink jet type printing head prior to or subsequent to use in a normal printing operation includes the steps of heating the ink path to a temperature above the temperature used during the printing operation and purging ink through the ink path during or subsequent to the heating step.

Abstract: An ink jet apparatus employs phase change ink which may be heated for jetting and is characteristically solid at room temperature. The ink is delivered and then advanced to a melting location in the solid state. At the melting location, the ink is changed to liquid state, whereupon it is jetted. The ink in the solid state takes the form of pellets which are advanced by a carrier.

Abstract: A head connection structure of a printer including a carriage with a flexible circuit sheet and a thermal head with another mating circuit sheet, comprises a cap board positioned detachably on the carriage and a positioning guide pin provided on the carriage. Both circuit sheets are held by and between the cap board and the carriage with the circuit sheet of the thermal head being positioned accurately by the guide pin.

Abstract: An optical imaging head is disclosed for use with optical imaging apparatus. The optical imaging head includes a plurality of imaging devices reproducing respective segments of an original image. A reflector is included for reflecting at least a portion of the reproduced image segments from an off axis position such that those segments are directed onto a focal plane substantially perpendicular thereto and substantially undistorted. In one embodiment, the reflector includes a plurality of reflecting surfaces separated by transparent surfaces allowing at least a portion of the reproduced image segments to be reflected toward the focal plane and the remaining image segments to be directly focused onto the focal plane. In another embodiment, the reflector includes an interlaced reflecting structure allowing all of the reproduced image segments to be reflected perpendicularly onto the focal plane.

Abstract: A method of exchanging writing implements for automatic drafting machine and its device in which a plurality of writing implement holders consisting of a stationary arm and a rotary arm at a stocker side, and a writing implement holder consisting of a stationary arm and a rotary arm is provided at a drawing head side, and when the drawing head moves to pick up a writing implement at the stocker side, a position of the stocker is shifted relatively to the drawing head so that a writing implement holding side end of the stationary arm at the drawing head side is shifted at a predetermined interval in the inside direction of an open portion of the writing implement holder at the stocker side relative to the writing implement holding side end of the stationary arm at the stocker side, and when the drawing head moves to place a writing implement at the stocker, a position of the stocker is shifted relatively to the drawing head so that the writing implement holding side end of the stationary arm at the stocker sid

Abstract: An electrooptical recording device for recording image information in an optical printer having a light source, an electrooptical switch and a recording medium and further including an electrode array having a plurality of central electrodes and associated external electrodes for controlling a plurality of N recording spots by half the number of driver stages. The recording spots are light sensitive and lie along a recording line and are exposed to the light source when a voltage is applied to a select pair of the electrodes deposited on the optically active material causing the electrooptical switch to change from an opaque to a transparent state. By controlling the operation of each pair of electrodes, the pattern of recording spots that are exposed is controlled.

Abstract: Ink jet apparatus utilizing hot melt ink and method of operation of that apparatus, the apparatus having a pressure source for repriming the system following non-use and freezing of the ink in the reservoir. The repriming operation may be carried out either manually or automatically, as long as permitted by the sensed level of the ink in the reservoir system.

Abstract: A thermal printer including a cam for pivoting a carriage guide plate to cause a thermal head mounted on the carriage to approach/separate from a platen. The cam is of a mountain-shaped form whose one side for pivoting the carriage guide plate to release the thermal head in press-contact with the platen is made heightened than the other side to bring the thermal head into press-contact with the platen.

Abstract: The present invention concerns a process for correcting the output level of a charge-transfer device, as well as a device for operating the same. Said process comprises different steps, respectively a first step where the quantities of charges corresponding to a reference signal that are stored in N stages are read successively and the values being function of the different quantities of charges read, are stored in a memory; and a second step, where before each read-out of a charges quantity, the precharge level of the output stage is modulated in function of the value of the same rank stored in the memory.