Abstract: A manually manipulatable magnetic card encoder containing substantially all of the apparatus and wiring required to encode magnetic spots on a magnetic card key or the like. The encoder is relatively small and includes a housing provided with a pistol grip to facilitate manual manipulation of the encoder.

Abstract: In order to increase recording quality the electrode pin of a device for electrostatically printing characters consists of a whisker which is mounted to be electrically conductive in a metal holder. A whisker is by definition a monocrystalline member.

Abstract: A magnetic card recorder which is capable of recording and replaying a signal on a magnetic track on the card and which has an actuator including at least two card engaging portions for engaging and detecting the card as it travels through the machine in which the two detecting means are spaced on opposite sides of an erase head which is mounted so as to float relative to the card, and, thus, to prevent transverse fluctuations between the erase head and the card.

Abstract: A cassette tape recorder including a device for making index marks on a strip denoting the position of magnetic tape relative to a magnetic head, the marking strip being on a cassette exterior surface and having magnetically alignable particles by which visible, magnetically erasable marks can be made. The marking device includes a controllable magnet for selectively magnetizing an element made of a soft magnetic material which conducts flux to the strip.In a magnetic tape cassette adapted for such apparatus a strip with magnetically alignable particles is arranged on at least one major flat wall of the cassette, so as to be readily visible.

Abstract: In a method and apparatus for electrostatically recording on a dielectric coated sheet, a recording head carrying a stylus array is spaced apart from the sheet to form an ionization gap. A charge image is transferred to the sheet by applying an activating voltage between selected styli and a back-up electrode. All styli receive a D.C. bias voltage and selected styli additionally receive "write" pulse voltage. The sum of the bias and write pulse voltages exceeds the threshold breakdown voltage of the gap to ionize the air in the gap under the selected styli. The charge image, created by the ionized air, is subsequently toned to form a visible image. The magnitude of the threshold breakdown voltage is dependent on the length of the gap and the required magnitude of the write pulses depends in part on how accurately the length of the gap is maintained constant.

Abstract: Liquid or dry developing substance comprising charged particles is applied to a base electrode in the form of a rotary cylinder. A sheet of recording paper is fed in contact with the cylinder. A printing head comprises a plurality of printing electrode sets formed into an array such as a rectangular dot matrix in which each electrode set constitutes a row of the matrix. Each electrode set comprises a plurality of shaping electrodes which constitute the individual data points of the row. At least one bias electrode is provided for each electrode set. Row select wires are connected to the bias electrodes of the electrode sets respectively. Shaping electrode or column select wires are connected to the shaping electrodes of all of the electrode sets in such a manner that a particular column select wire is connected to the shaping electrodes of all of the electrode sets in a corresponding column.

Abstract: A magnetizable layer is initially magnetized and selected portions thereof are demagnetized by an optical imaging system. In one embodiment, an image to be reproduced is projected through a transparent electrically conductive electrode which is brought into contact with a photoconductive matrix through which is dispersed magnetizable particles. Changes in resistivity of the photoconductive matrix causes a current density distribution, which corresponds to the image intensity distribution, to flow transversely from the transparent electrode through the photoconductive matrix to a support electrode on which the matrix is fixed when a potential is applied between the transparent and support electrodes. The current distribution results in corresponding magnetic fields which modify or "erase" selected portions of the initially magnetized layer.

Abstract: A magnetic printer includes an elongated comb-like printing head disposed opposite a magnetizable-oxide-bearing surface of a selectively magnetizable moving belt, and adapted to magnetize regions of the belt in a direction transverse to the direction of belt movement; and a magnetic brush for depositing magnetic ink upon the oxide-bearing remaining surface of the belt, with the magnetic brush positioned beneath the printing head, whereby the printing head provides a bearing surface along which the magnetic belt slides. The brush is designed for minimum field at the inking position while the head is designed to have its field direction transverse to the direction of the field of the brush, for minimum field interaction.

Abstract: This invention relates to a playback system for a magnetic tape recorder comprising an amplitude distortion corrector. It has an input versus output characteristic such that when the input level is less than the playback saturation level, which corresponds to the start of non-linear characteristics of the playback signal produced from a recorded signal at more than the recording saturation level due to a saturation of the magnetic tape, the output level is proportional to the input level. When the input level is more than the playback saturation level, the input verses output characteristics is complementary to the input versus output characteristic of the magnetic tape at corresponding signal levels.

Abstract: A data recording apparatus including a data recording circuit for recording event data provided by a data source on a first track of a magnetic tape and a time recording circuit which effects the recording of time reference data for the event data on a second track of the tape, the time recording circuit including a digital clock which provides encoded data representing month, day, hours and minutes for recording on the tape and an identification data source which provides encoded data representing an identification number for the data source for recording on the tape, the time and identification data being recorded on the tape in a bi-phase format.

Abstract: A first main information signal is recorded in a first track extending longitudinally along one side of a length of magnetic tape and a corresponding first secondary, or control, signal is recorded in a narrow parallel track spaced from the first main track. A second main signal is recorded in a third track within the other half of the tape, and a corresponding second secondary, or control, signal is recorded between the first secondary signal and the first main signal, whereby the two main signals and the two secondary signals are interleaved with each other. The first and second main tracks are equal in width, and the first and second secondary tracks are also equal in width but are much narrower than the first and second main tracks.

Abstract: A mode selecting device for a tape recording and/or reproducing apparatus includes a plurality of push-button members which are selectively actuable from rest positions to active positions for selecting corresponding operating modes of the apparatus, electrically energizable driving means, such as, solenoids, which are energized in response to the actuation of a selected one of the push-button members to an active position, operating members selectably movable by said driving means from inoperative positions to operative positions in response to the energizing of selected solenoids and being urged to an inoperative position upon deenergizing of such solenoids, a plurality of transmission members coupled with the operating members which are moved in response to the actuation of a respective one of the push-button members for establishing the corresponding operating mode of the apparatus by the movement of the operating member to its operative position, and a release operative, for example, by actuation of a st

Abstract: Liquid or dry developing substance comprising charged particles is applied to a base electrode in the form of a rotary cylinder. A sheet of recording paper is fed in contact with the cylinder. A printing head comprises at least one bias electrode to which is applied a bias voltage of a polarity to repel the charged particles against the cylinder. At least one shaping electrode which extends closer to the recording sheet than the bias electrode is selectively applied with a voltage of a polarity and magnitude to overcome the bias voltage and attract only the charged particles immediately adjacent to the shaping electrode to the recording sheet for printing.

Abstract: Magnetic printing process, and apparatus for carrying out same, comprising:(a) forming a magnetic image on a ferromagnetic material which is imposed on an electrically conductive support;(b) developing the magnetic image by decorating same with a ferromagnetic toner comprising a ferromagnetic component, a dye and/or chemical treating agent and a water-soluble or water-solubilizable, preferably thermoplastic, resin which substantially encapsulates the ferromagnetic component and the dye and/or treating agent;(c) transferring the developed image to a substrate;(d) permanently fixing the dye and/or chemical treating agent of the image on the substrate; and(e) removing the ferromagnetic component and the resin from the image on the substrate.

Abstract: Constant wavelength magnetic imaging is provided by generating a signal having a frequency proportional to the speed of a rotational recording member, multiplying that frequency up to a higher, desired recording frequency, and phase-locking the higher frequency signal to the unmultiplied lower frequency, thus synchronizing the recording frequency with the motor speed.

Abstract: In a magnetic-tape sound recorder including mode-selecting and selected mode holding means for selecting a desired mode out of a plurality of modes of operation and holding the selected mode until the mode is to be cleared, an automatic start and shut-off apparatus comprising locking means for holding the operational component parts of the recorder in a locked condition until the locking condition is automatically terminated. Also provided in the apparatus is an unlatching means operative to clear the selected mode in the mode-selecting and selected mode holding means. Motion translating means between the locking and unlatching means holds the unlatching means disengaged from the mode-selecting and selected-mode holding means when the locking means is operative to hold the operational component parts in the locked conditions.

Abstract: A system for monitoring evolutive information data picked up at various pts in associated informatics equipment and analyzing selected information data sequences comprises means for permanently recording information data on a continuous track magnetic carrier having automatic erase means at the end of each track. Recorded sequences of information data are controllably displayed after the data has been written in. At the write-to-read switching operation, an index marking the origin of the information sequences to be displayed is recorded on a special track of the carrier and said index is thereafter used for synchronization of the display on a CRT. A clock pulse counter circuit under the control of an operator enables him to vary the origin of the displays.

Abstract: A mist of substantially-neutrally-charged, colorant-activating particles is deposited on a receiver in accordance with its interaction with an imagewise modulated ion stream. The deposited particle image is contacted with developer material to form a high density image.

Abstract: A printing system of the type wherein magnetic images are recorded on a tape, the images are toned, the tape is positioned to extend adjacent to a web of paper, and the toner is then transferred from the tape to the paper. In the present system, the tape portion which passes by the image recording head and toner is moved continuously, while the tape portion which passes adjacent to the paper is moved intermittently by frictional engagement with a transport belt, a pair of vacuum column buffers being provided between the continuously and intermittently driven tape portions and supplying tape tension that holds the tape to the transport belt.

Abstract: A frequency response equalizer includes a parallel combination of a low-pass integrating circuit and a high-pass differentiating circuit. Both circuits receive an input signal from a reproduce head followed by a preamplifier. Each circuit provides a 90.degree. phase shift with respect to the input signal, equal in magnitude and opposite in sense. A subtraction circuit coupled to the respective outputs of both the integrating and differentiating circuit provides a difference signal of the respective output signals of both circuits. The resulting difference signal represents an amplitude and phase equalized signal.