Abstract: For more efficient operation, many serial or line electrostatic printers operate at voltages above ground whether in the print or nonprint mode. The effect of these voltages is to cause the creation of varying current flow in the conductive portion of the recording medium employed in these types of printers. This current flow establishes points of potential and electric fields in the area of the development station of the printer causing the toner medium to deposit onto the surface of the toner dispenser. Toner build up on this surface detrementially provides a source of toner deposit as background or large dark areas on the recording medium. A compensating circuit is provided to sense these potentials and apply a current signal to the recording medium that nullifies the effect of this current flow and eliminate the detrimental depositing or plating out of toner or the toner dispenser surface.
Abstract: An automatic switching device for a cassette tape recorder is provided which includes a detecting member disposed within the tape recorder for cooperation with at least one detection opening provided in a tape cassette so as to indicate the variety of a magnetic tape internally housed therein, thereby establishing an optimum bias and/or an optimum tape speed for the tape recorder, a compensation circuit compensates for low frequency signals recorded on the tape when the detecting member determines that such compensation is desirable.
Abstract: A method and apparatus for indicating the type, such as in terms of overall recording capacity, and remaining recording capacity of a recording tape. The tape is transported at a predetermined speed from a supply reel to a take-up reel. The rotations of the respective reels are sensed and the rotational periods T.sub.s and T.sub.t of the supply and take-up reels, respectively, are determined. Based upon these determined rotational periods, predetermined characteristics, such as the overall recording capacity, of the recording tape are indicated, irrespective of the arbitrary amount of tape which, initially, is wound upon the take-up reel. For example, a set of characteristics is stored for each value of T.sub.s.sup.2 +T.sub.t.sup.2 ; and the one set which is associated with the determined value T.sub.s.sup.2 +T.sub.t.sup.2 is selected. Also, the determined rotational periods T.sub.s and T.sub.
Abstract: A method for performing electric discharge recording on the recording surface of an electric discharge recording material using a discharge recording stylus comprises interposing an electrically anisotropic non-recording layer between the recording surface and the discharge recording stylus. The non-recording layer is prepared by dispersing a metal powder in a resin matrix and has a surface resistance of at least 10.sup.8 ohms and a volume resistance of not more than 10.sup.4 ohms-cm. Electric discharge recording is performed through the non-recording layer. A composite discharge recording material comprises (a) an electric discharge-breakable semiconductive resin layer having a surface resistance of 10.sup.5 to 10.sup.16 ohms and a volume resistance of 10.sup.3 to 10.sup.14 ohms-cm, (b) a metal-containing resin layer having a surface resistance of at least 10.sup.8 ohms and a volume resistance of not more than 10.sup.
Abstract: A stylus having an electrically-conductive writing tip is used to write on an electrically-sensitive paper, for example a metallized paper in which the metallization is eroded by the current passed by the stylus. The stylus is energized by a coded train of electrical pulses whereby the coding is reproduced in the writing which can thus be verified as genuine. The material to be written on, for example an airline ticket whose fraudulent alteration is to be exposed, may be supported on a stand having a conductive resilient arm bearing on the electrically sensitive surface to provide a return path for the stylus current. The principle can be applied with coded optical pulses directed onto an optically-sensitive paper.
Abstract: In a metal-insulator alternate type multilayer head core usable for magnetic sound recording and reproducing, metallic component layers are connected to each other via one or more metallic interconnecting layers passing locally through insulating component layers in order to provide high effective permeability with minimized eddy current loss. In manufacturing, a metal-insulator alternate type multilayer construction including the metallic interconnecting layer or layers is subjected to sintering in order to avoid intermetal separation to be otherwise caused by cracking in the insulating layers.
Abstract: An electrodynamic printing system with at least one conductive stylus electrode against the back side of a sheet to be written upon and a store of solid conductive writing material, preferably in a roller electrode form, disposed on the opposite side of the sheet. A circuit is provided to apply current pulses between the electrodes causing current flow therebetween through the sheet sufficient to erode writing material from the front electrode and cause it to become implanted on the sheet, for forming a writing pattern. A linear array of stylii aligned with the roller provides a line printer apparatus.
Abstract: A cassette tape ejecting mechanism comprises a driving gear wheel with which a first driven gear wheel having at least one non-toothed portion is engagable for manually ejecting the cassette tape through linkage mechanisms by slightly depressing the depressing button and the same driving gear wheel with which a second and third driven gear wheels are engagable for automatically ejecting the cassette tape or automatically reversing the tape winding direction through linkage mechanisms when the tape is fully taken up from one reel to the other.
Abstract: An electrostatic recording medium having an insulating base, a conductive layer on the base, and a dielectric layer on the conductive layer. The conductive layer is divided into a plurality of segments arranged in a direction in which recording electrodes are aligned with each other, so that when associated electrodes of all the arrays of recording electrodes on one side of the recording medium are selected in common with each other and one of complementary electrodes on the other side of the recording medium is selected, a discharge occurs only in the recording electrode disposed above the selected complementary electrode. Each conductive layer segment is formed with at least one conductive portion extending through the insulating resin base and capable of coming into contact with one of the complementary electrodes.
Abstract: An electromagnet for degaussing a magnetic head and which includes a yoke having a gap and one or more coils wound thereon is characterized by the middle portion of the yoke face, at and adjacent to said gap, being wider than the magnetic tape that passes by the magnetic head, and by the side portions of said yoke face, away from said gap, being narrower than the tape.
Abstract: Groups of recording electrodes are alternatingly connected to two sets of data bus lines. A high voltage for electrostatic recording on a sheet of paper is applied from a power source to inputs of data switches which are connected to the respective bus lines. Power switches are provided between the power source and the sets of bus lines respectively to alternatingly gate the high voltage to the sets of bus lines. Opposite high voltages are sequentially applied to rear electrodes provided behind the recording electrode groups in synchronization with application of the high voltage to the data switches so that only the recording electrode group conjugate to the energized rear electrode applies an electrostatic recording charge to the paper. Data signals are applied to the data switches to cause the same to pass or block the high voltage to the individual bus lines in accordance with whether the data signals are logically high or low.
Abstract: The present invention relates to a printing bar with a plurality of styli (10) for printing an image.It includes a first network of conductive tapes (1) insulated from one another and in which one end of each of them forms a printing stylus (10) and n diagonal matrices for addressing the styli whose columns are formed by the conductive tapes (1) of this first network and are fed via resistances (R) in electric contact with the tapes (1) of said first network and in which the rows common to the n matrices are formed by conductive tapes (7) of a second network and are connected to the columns via diodes (D) connected in the columns or in the rows.Application: a facsimile transmission installation.
June 9, 1978
Date of Patent:
December 25, 1979
Compagnie Industrielle des Telecommunications Cit-Alcatel
Marcel Yvard, Jean-Claude Decuyper, Michel Beduchaud
Abstract: In an operating mechanism of a tape recorder, there is provided means for preventing the play-back operation from being released by the cue or the review being effected and for permitting the play-back operation to be resumed immediately after the cue or the review is interrupted. There is also provided means for ensuring that the recording lever and the review lever or the cue lever, if pushed in at the same time, are automatically returned to their non-pushed-in position upon release of the push-in force.
Abstract: The device records images in the form of dots on electrical discharge-sensitive paper. A plurality of styli are mounted on a rotor. The paper is in strip form and is fed continuously through a curved guide in a direction perpendicular to the plane of rotation of the rotor, so that the paper is wrapped part-way around the rotor as it moves past. Characters are formed from a 5 dot by 7 dot matrix. This divisional patent is directed to the feature whereby the paper is pushed towards the rotor by means of a drive roller located closely adjacent the platen, at a location in which the paper is curved to form an arc. The drive roller is much narrower than the width of the paper, and the stiffness of the paper column which the roller pushes is relatively great. The curved exterior of the housing is used both as a housing and as a curved paper guide. A hinged guide co-acts with the housing in guiding the paper and forming it into an arc.
Abstract: The device records images in the form of dots on electrical discharge-sensitive paper. A plurality of styli are mounted on a rotor. The paper is fed past the rotor. The paper has a coating which is eroded away by sparks between the styli and the paper. This divisional patent is directed to the provision of a support structure which supports the device with the coated side of the paper down so that when it is recorded on any debris caused by the erosion will fall away from the paper under the force of gravity and will not accumulate near the styli.
Abstract: The device records images in the form of dots on electrical discharge-sensitive paper. Multiple styli are mounted on a rotor. This divisional patent is directed to the paper feed means in which the paper is fed past the styli through a concave guide. The housing of the device is cylindrical with a curvature to match that of the concave guide, and is used both as a housing and as a convex paper guide. A drive roller extends through an opening in the cylinder wall to make contact with the paper. An idler roller on the other guide member mates with the drive roller to grip the paper. The concave guide member is hinged to the housing so as to be movable out of the way to facilitate threading the paper through the machine at the start. The rotor rotates within a cylindrical platen of a diameter larger than that of the housing. The paper moves from the outside of the housing to the inside of the platen, where images are formed on the paper by the styli.
Abstract: The printer records images in the form of dots on electrical discharge-sensitive paper. A plurality of styli are mounted on a rotor. The paper is in strip form and is fed continuously through a curved guide in a direction perpendicular to the plane of rotation of the rotor. Each stylus is energized by a voltage sufficient to create an electrical discharge between the paper and the stylus, in accordance with a code supplied from an electrical memory in which the codes for the character images are stored. This divisional patent is directed to the feature whereby words and sentences are formed longitudinally on the strip. Several lines of text can be formed on the strip, and a whole page of text can be printed relatively quietly and at a relatively high speed and low cost. Characters forming one message are stored in memory. Then they are read out in the sequence in which characters from different lines are to appear in transverse columns. The length of the lines can vary over a wide range.
Abstract: In a method and apparatus for controlling a combustion engine, a digital computer is adapted to calculate first and second values corresponding to optimal settings of fuel injectors and spark plugs in a time sequence by detecting changes of the amount of air flowing into the engine and the rotation speed of the engine. The computer is programmed to calculate the first and second values from functions describing desired relationships among each setting of the fuel injectors and the spark plugs, the amount of air flowing into the engine and the rotation speed of the engine, thereby to eliminate a conventional negative pressure detecting element.
Abstract: The printer records images in the form of dots on electrical discharge-sensitive paper. A plurality of styli are mounted on a rotor. The paper is fed continuously through a curved guide in a direction perpendicular to the plane of rotation of the rotor. This divisional patent is directed to the provision of an automatic blackness control circuit for varying the stylus voltage directly with the rotor speed so that the blackness and readability of the images remains relatively stable despite wide variations in operating speed.
Abstract: A head for magnetizing a broad magnetic tape or the like to form magnetic images representing lines of high quality characters or other images, including a large number of closely-spaced recorder elements, such as two thousand spaced a few thousandths inches apart, the elements having parallel strip portions with recording locations therealong. The elements are arranged in groups, with the elements in one group having a common enlarged interconnected region on one side of the recording locations and with each element in the group having a separate enlarged terminal on the other side of the line of recording locations. The terminals are arranged in a staggered fashion, so that the elements located progressively closer to one end of the group have terminals located progressively further from the line of recording locations.