Abstract: In a piezoelectrically-driven printing head for a dot-matrix ink printer, the ink canals (11) have a funnel-shaped enlargement (19) connected through a filter (18) to a common ink reservoir (16). The enlargements (19) increase the ink current cross-section in the area of the filter (18) and thereby increase the ink flow rate.

Abstract: Process and circuit for carrying out said process for control of the transmission of PCM signals between subscriber stations of a PCM time-division multiplex communication network in a conference service by means of a central conference control circuit in which a central processing unit allots to each station involved in a connection a transmitting pulse with cyclically repeated transmission time slots occurring in sequential pulse brackets of time frames and a receiving pulse with cyclically repeated receiving time slots occurring in sequential pulse brackets. The PCM signals are algebraically summed immediately upon their receipt and temporarily stored in a manner specific to the receiving station only until the expiration of the next succeeding period of signals not relevant to the conference, at such time when they will be transmitted to their respective conference related stations and subjected to a partial summation.

Abstract: Printing or recording apparatus for the selective printing of single sheets or margin-perforated endless paper in which for the endless paper operation a separate conveying unit can be put in place on the printer housing which unit is provided with conveying means engaging in the perforated margin of the endless paper. The sight case of the conveying unit is arranged over the feed opening as well as the delivery unit for the single sheets. A movable lid permits access to these openings for the single-sheet operation but covers these completely and in a soundproofing way for endless paper operation. Connected with the movable lid there is a prop which in the closed position of the lid automatically lifts off the platen the feed rolls not required in this operating state.

Abstract: In an image reproducing apparatus with electromagnetic beam deflection of the picture tube (10) occurring as a function of an image synchronizing signal (BSN) and with a blower (20), the motor (18) of the latter is designed as a phase-shifting asynchronous motor to avoid image interferences due to magnetic leakage fluxes, in which motor the current supply takes place in a bridge circuit (50) controlled as a function of the image synchronizing signal (BSN) in such a way that the rotary field of the motor (18) is synchronous to the image synchronizing signal (BSN).

Abstract: The invention comprises a circuit arrangement for the control of digital signal transmission, particularly PCM-signals, between stations of a time division multiplex telecommunication system, particularly a PCM-time division multiplex telecommunication system, with a central control unit, via a multiplex channel to which every station can be connected and on which every station included in a connection is allocated a transmission pulse with cyclically repeated time slots occurring in successive pulse frames and a reception pulse with cyclically repeated time slots occurring in successive pulse frames, with stations combined in a group of stations jointly connected to a transmission trunk by their transmission outputs and to a reception trunk by their reception inputs, and with all trunks connected to the multiplex line via amplifiers. In this context digital signals are understood to be voice signals and data.

Abstract: Printing apparatus with a roller platen and a plastic strip for holding paper against the roller platen even if insufficient paper is fed through to reach the usual guide rollers. The plastic strip is arranged in a closed loop and is connected to the print element to move with it in the line direction. The strip has a perforation for the penetration of printing type or the like.

Abstract: In an information input and output unit (10) for data processing equipment, including an input keyboard (14) and a tactile read-out panel (28) with a control keyboard (30) for tactile data display for the vision impaired, it is provided, for making operation by vision-impaired persons easier, that the input keyboard (14), the control keyboard (30) and the tactile read-out panel (28) are arranged in one plane, that the tactile read-out panel (28) with the control keyboard (30), as seen by the operator, is in front of the input keyboard (14) and that in front of the tactile read-out panel (28) is arranged a hand rest surface (102). Between the tactile read-out panel (28) and the control keyboard (30), finger guides (90) may be optionally provided to make the orientation easier. Parallel to the output lines (56,58) of the read-out panel (28) are formed receiving grooves for receiving replaceable information strips (70) which show heading information in the form of Braille characters (74,78 ).

Abstract: The invention relates to an apparatus for printing on receipt forms or the like with a one-line printing mechanism. In order also to be able to print the form with a number of lines, this is gripped firmly on a sliding carriage and the carriage is moved along into different line positions on the printing mechanism. A mechanical control mechanism with a cam plate serves for driving the sliding carriage. The closed cam plate makes possible a control in the retraction and extension direction with a corresponding rotation of the cam plate. The exact positioning of the sliding carriage is done by a ratchet in the control mechanism. An electronic control takes care of an automatic running of one printing operation.

Abstract: Apparatus for guiding an ink ribbon for a printer, with top edges standing perpendicularly to and inclined forward toward the printing plane, over which the ink ribbon laid on flange plates which act as slides when fed further and threads in itself. At the same time means for the quick fixing of the print head are provided on the apparatus serving for the guiding of the ink ribbon.

Abstract: Process for control of the transmission of PCM signals between connectors of a PCM time-division multiplex communication network in a conference service and circuit for carrying out the process.

Abstract: In the circuit arrangement according to the invention, the two transistors with their main current lines connected in series cause no disturbance of balance in the subscriber's line. By means of exclusively alternating current coupling on the subscriber's lines wire leads, extension elements which cause no galvanic voltage drop can also be connected on. The series connection of the main current lines of the transistors may be run directly to the input of the amplifier emitting the outgoing signals.

Abstract: A money dispensing device for use in safes or the like which transfers money from a security area to a dispensing point. A powered drawer transfers money from the security area to the dispensing point. The dispensing point is provided with a door, which is automatically controlled, such that the door opens only when sensors indicate that the drawer has reached the end of the dispensing point, and after opening, the door closes only when sensors indicate that the drawer is empty.

Abstract: An arrangement for monitoring the operation of the ink ribbon (2) of an ink-ribbon magazine (1) for electromechanical print units or print mechanisms comprises contacts (12,6) on the ink-ribbon magazine (1) on either side of the ink ribbon's path (4) and intended to lie against the ink ribbon (2), and opposite contacts (7,8) on the print unit which, when the ink ribbon magazine (1) is inserted, are in contact with the contacts (21,6) of the later and are connected electrically to a function or malfunction indication (10). When holes or tears occur on the ink ribbon (2), the contacts (12,6) on the ink-ribbon magazine (1) come in contact with one another and thereby set off a signal which can be used to switch off the print unit and/or for a malfunction indication.

Abstract: A signal processing circuit for a signal varying in its properties, e.g., in its degree of distortion, in which the input signal is fed in parallel to two similar processing circuits e.g., equalizers, the characteristic of which can be varied by a control signal, wherein the control signal from the one processing circuit is periodically varied and the output signal is fed to a detector circuit which in optimum signal processing emits a trigger pulse to a holding circuit 52 which stores the corresponding control signal level, which is fed to the second processing circuit.The detector circuit provided for an optimum equalization is a timing-pulse-controlled integrating circuit with a minimum detector connected at the output side. An application of the circuit for digital data transmission with the related synchronizing timing demodulator and phase control circuits is represented.

Abstract: Sheet feeding accessories for a typewriter-type printer unit having a stepwise driven print roller. The single sheet feeder is pivotally mounted on the printing unit and the continuous sheet feeder is mounted piggyback style on the single sheet feeder. A drive belt commonly connects the print roller, the single sheet feeder, and the continuous sheet feeder. take-off (60,61) is provided down stream in the direction of printing media movement. Both a single sheet conveyor (15) and a continuous form conveyor (30) attached to conveyor 15 are driven by a drive belt 21 commonly interconnecting the drive roller (12), the drive take-off (60,61) with the sheet and forms conveyor to achieve synchronous operation in the same feed direction. The drive take-off (60,61) has rollers of such a circumference in engagement with the printing media so as to maintain tension on the printing media when fed therethrough.

Abstract: A security-oriented conveyor system for currency dispensers and the like comprising a pair of conveyor belts which lie in facial contact with one another to grip one or more sheets of currency between them and convey same through a downwardly inclined slot in a vault wall. Conveyor rollers are located adjacent the slot openings to prevent tampering.

Abstract: A cash register tray for currency and coins having its own pivotal cover and lock whereby the tray can also be used as a portable cash box. A spring and electromagnet within the tray itself control opening and closing functions.

Abstract: A mount for a projector or the like has a base with a convex spherical bearing element rotatably mounted therein and having a guide slot on the convex surface and a concave support rests thereon with a depending pivot pin disposed in a tapered aperture in the bearing and a projection fitting in the guide slot for limiting tilting of the support.

Abstract: Apparatus is disclosed for providing a modulo-n check character as a function of a sequence of data characters. The check character may be used to permit a check of the data character sequence for its correctness, for example, after being transmitted to a data processing installation or after printing. In the preferred embodiments each data character of the sequence is generated by one of a plurality of data character carriers which are selectively set to generate a given character. An additional check carrier is provided to generate the check character. The check carrier is set by a predetermined amount each time one of the data carriers is set so that the ultimately generated check character is a function of the data character sequence.

Abstract: A device for the automatic equalization, on the receiving side, of digital data signals, in which, after amplitude stabilization, the input signal is fed to a synchronizing unit and a clock signal generating unit, a distortion measuring unit and a controllable equalizer unit in which the distortion measuring signal is fed to the equalizer as a control signal. The output signal of the equalizer is then normalized in amplitude. The equalization measuring unit consists of a squaring or rectifier unit, a clock filter for the zero transition region and an integrator. Equalizers with different characteristics and their circuits are represented. The amplitude stabilization on the input side may be supplemented by an amplitude-controlled pre-equalization (FIG. 1).