Abstract:
The invention pertains to a process for realizing high-availability disk storage through redundant combination of individual drives (18a..c). Thus, the control units (16a..c) take over the generating of correction information, which is either transferred, under CPU control, from the control unit (16a) of the target drive (18a) to the control unit (16c) of the redundancy drive (18c) or is transferred, under control of the control unit (16a), directly to the control unit (16c) of the redundancy drive (18c). This yields particular advantages in systems having separate CPU bus (13) and I/O bus (15), which are coupled by a bus coupler.
Abstract:
An optical character generator for an electrographic printer has a plurality of monolithic circuits (11) arranged on a support (10) on which are integrated individually activatable LEDs (12). The monolithic circuits (11) consist of a monolithically integrated activatable combination of photodiodes, containing a monolithic circuit (11) in which are integrated both the relevant LEDs (12) and the activation circuit (13), possibly including a BUS circuit (14) for the LEDs (12). The monolithic circuits are made using the thin-film technique from III-V semiconductor material, preferably GaAs.
Abstract:
Large-scale integrated circuits, in particular ASIC's, have an input converter (1) with an emitter follower (2), a reference voltage generator (3) and VCC and VEE voltage supply. When several outputs of ASIC's with an ECL periphery are switched at the same time, an interference voltage is induced on the internal VCC network of the ASIC's because of the series inductance of the VCC supply pins. This interference is coupled to the outputs, the internal circuits and the reference voltage of the internal reference voltage generators, so that malfunctions may result. In order to avoid this inconvenient, the VCC supply voltage of the receiving converter circuits (1) is separated from the VCC supply voltage of the reference generator circuit (3).
Abstract:
In the character matrix-like memory (ZM) of a character generator for a picture reproduction device (BW) the number of columns (SP) per character (Z) is increased by a column factor. The clock frequency for reading the character memory (ZM) is likewise increased, whereas each pixel (P) in the horizontal direction is stored multiplied by more than the column factor.
Abstract:
The application-specific circuitry of a data processing equipment (DVA) are assembled in a user unit (PB). Application-specific peripherals (GL, PR; T, D) are linked to the user unit by an interface multiplexer (MUX).
Abstract:
A device for detachably fixing a fixing drum (11) on a bearing flange (14, 16) in the fixing unit of an electrophotographic printing or photocopying machine comprises: a conical expansion element (31) allocated to the bearing flange (14, 16), an elastic receiving sleeve (32) with an opposing inner cone (33) which encloses the expansion element (31) like a collet chuck, and an outer support surface (34) for the receiving sleeve (32) at an inner radius of the fixing drum (11). To fix the fixing drum (11) on the bearing clamp (14, 16), the expansion element (31) opens out the receiving sleeve (32) and forces it against the inner radius of the fixing drum (11). The device facilitates the opening and closing of the connection between the bearing clamp and the fixing drum, even when the temperatures of the bearing clamp and fixing drum differ.
Abstract:
The invention relates to a process for feeding a sheet (50) into a processing unit, especially a printer with a sheet-feed channel (56, 60). In order to guide the leading edge of even bowed or creased sheets (50c) properly into the feed channel (56, 60), the sheet (50) is advanced towards the feed channel until a flat sheet (50a) projects into it to a certain extent (d) and a creased or bowed sheet (50d) can rest with its front edge against the edge of the channel (54, 56). Subsequent passes by conveying devices (30, 32) fitted on the printing slide (12) force the sheet (50d) behind the channel edge (54, 56).
Abstract:
A strip-shaped auxiliary support (19) is used to fit semiconductor chips on a locating surface of a substrate, especially for the manufacture of symbol generators for a printer operating by the transfer process or to make scanners or thermocombs. Mini-module supports (12) are arranged on the auxiliary support (19) to pivot universally in relation to the auxiliary support (19). The mini-module supports (12) have a fitting surface (16) espousing the design of the positioning surfaces (11) of the substrate and a receiving surface (17) opposite the fitting surface (16) to receive the chips. The mini-module supports (12) are suspended in the auxiliary support (19) via a cardanic or labyrinthine structure. The arrangement is suitable for close-tolerance positioning with securing methods like soldering, welding and adhesively securing using heating elements and lasers.
Abstract:
The invention concerns a method for controlling a digital coupling-field store (12), by means of which the connections between the subscribers in a telecommunications system can be switched by the space-time method. Each input channel of the coupling-field store is optionally allocated to a coupling-field store location, and to form conference data-links the input channels of the several subscribers participating in this conference data-link and authorized to transmit are allocated to a common coupling-field store location, and the data from the subscriber transmitting at any particular instant is entered in this store location.
Abstract:
The production of light-emitting diode rows (LED-rows) for non-mechanical printers requires an exact positioning of the LEDs (1) on a modular plate (3). Since each LED row is composed of several LEDs (1) arranged in a row, an exact positioning of the LEDs (1) in relation to each other and to the modular plate (3) is required. The clearance limits lie around ± 3 to 10 νm. In order to obtain a process with as few operations as possible that ensures an exact positioning and a soft handling of the LEDs (1), an auxiliary carrier designed as a sucking carrier (2) is disclosed. Each sucking chamber (6) which it contains retains one LED (1) by negative pressure. The use of the sucking carrier (2) makes it possible to dispense with wet-chemical processes and mechanical cleaning processes to remove the auxiliary carrier from the LEDs (1). When the sucking carrier (2) and the modular plate (3) are heated, soldering can be carried out in a very short time without expensive soldering installations, in a holding fixture and under constant inspection by means of a measurement microscope (5).