Abstract:
The invention relates to an attachment for securing an end-part of a toothed belt-element (12, 14) to a machine element (10). The machine element (10) has a slot (18, 16) for receiving an end-part of the belt-element. Arranged on at least one of the opposing walls of the slot is at least one gripping bar (22, 28) which projects into the slot and the cross-sectional shape of which corresponds generally to the cross-sectional shape of a tooth-space formed recess (24, 30) in the end-part (14a, 12a) of the belt element.
Abstract:
The invention relates to a device for joining together toothed belt elements (16, 20). The device includes two flat parts (12, 24) which are mutually joined through the medium of a hinge-forming web-part (26). At least one flat part (24) has engagement elements (30, 32) for engagement with corresponding recesses in the belt elements (16, 20), and snap-in locking means (36, 38, 40, 42) are provided for locking the flat parts (12, 24) together.
Abstract:
The invention relates to an arrangement for an image scanning unit (1). This comprises a semiconductor capsule (2) so arranged as to generate electrical signals corresponding to an image incident upon the light-sensitive surface (2a) of the capsule and so arranged as to be connected by soldering to a circuit board (5). Also present are an optical system arranged in a holder (3) for projecting the image to be scanned onto the aforementioned light-sensitive surface (2a) and a mounting plate (4) positioned between the semiconductor capsule (2) and the circuit board (5). Finally, devices (3a, 3b, 4a) are also present for joining together the holder (3) and the mounting plate (4) and for ensuring correct mutual alignment between the semiconductor capsule (2) and the optical system.
Abstract:
In a method and a device for preventing unauthorised access to a computer system comprising at least one processing unit (1) or the like, a disc unit (3), a display (5), and a keyboard (7), use is made of a floppy disc (9). Information in the form of a personal identification code containing the name of an authorised user and an access code encrypted by means of a one-way encrypting function, and an authenticity code formed by a system access code and at least the personal identification code are recorded on the floppy disc. After insertion of the floppy into the disc unit, the computer system is adapted, in starting-up, to read at least the personal identification code and the authenticity code; to check the authenticity code by means of the system access code and the information recorded on the floppy disc and used to form the authenticity code; to request, via the display, the user to enter his name and access code in non-encrypted form via the keyboard; to encrypt the access code entered by the user; to check the read name against the entered name and, respectively, the read, encrypted access code against the entered access code which is then encrypted by the computer system; and to give the user access to the computer system merely in case of a positive result of all three checks.
Abstract:
A video display unit includes a built-in switched mode power supply (SMPS 5) and control means (7), responsive to the presence of one or more active sync signals (Hsync, Vsync), to switch on the display unit from the DPMS OFF mode, in which it consumes a minimum amount of power and to which it is switched in the absence of any active sync signal. Peak sensing circuitry (30) extracts power from the sync signals for driving an optocoupler (32) but driving is only permitted if ac sensing circuitry (31) detects that at least one sync signal is active when switch (33) is closed. A switch (22) disconnects the SMPS controller (23) from the start-up power source (21) until the optocoupler is driven.
Abstract:
The invention relates to an arrangement at an interface at one end of a connectable and a disconnectable multi-conductor cable (120). The arrangement comprises a first multi-contact member (10; 226) and a second multi-contact member (80), which is connectable to the first multi-contact member. The first multi-contact member (10; 226) comprises a plurality of contact elements (20, 50), some (20) of which at least are coupled to a data bus (40, 230), for example a so-called SCSI bus, which requires terminator means (70) coupled to each of the bus conductors, when the multi-conductor cable is disconnected, but not when it is connected. The arrangement also comprises a sensor means (50, 55, 90; 270, 280, 300) for sensing whether the multi-conductor cable is connected or disconnected, and a switch means (60; 250) controlled by the sensor means (50, 55, 90; 270, 280, 300) and comprising a switch element (62) coupled between each bus conductor and its associated terminator means (70). The sensor means (50, 55, 90; 270, 280, 300) is arranged to control the switch means (60) to keep the switch element (62) closed when the multi-conductor cable is disconnected and open when the multi-conductor cable is connected.
Abstract:
A system and method for protecting an electrically-powered article, particularly a computer system such as a personal computer, from theft by rendering it effectively useless to anybody but the rightful user/owner. The personal computer includes a power disruption indicator (21) to which electrical power must be applied even when the computer is shut-down (switched off at switch 12). The continuous power is normally provided by means of a mains-supplied power unit (10). In the event of mains supply discontinuities longer than a predetermined short time period, as would be the case if the equipment is stolen, subsequent start-up of the computer is prevented until a theft protection password is provided by a potential user. A separate power source, such as a capacitor (20), is provided to power the power disruption indicator for shorter time periods, such as when moving the computer within premises, and thus obviate the need to enter the theft protection password upon such occasions.
Abstract:
A buffer circuit for use between a two-way open-collector bus line (4) and a device (D) capable of reading the status of the bus line and driving it low. The device has a single input/output terminal (1) to which is connected a line (7) of the buffer circuit. The buffer circuit is such as to distinguish between three logical levels on the line, and in particular between two logical low levels (Ua, Ub), which correspond to the device (1) or the input buffer (C1) driving the bus line low. The input and output buffers are comprised by respective comparators (C1, C2). The reference voltage for the output buffer comparator lies between Ua and Ub, whereby to achieve the distinction therebetween. When the output buffer comparator detects Ua, it causes the bus line (4) to be driven low.
Abstract:
In a method for increasing the functionality of a computer program, use is made of a computer system comprising a user/terminal (1) which via driver modules (2-3) is connectible to a computer program (5). When the user/terminal requests execution of the computer program, the user/terminal is connected initially to a wrapper program (6) via an additional driver module (4). After data exchange between the wrapper program and the user/terminal, the computer program is started from the wrapper program. Finally, the wrapper program is disconnected, and the computer program is connected to the user/terminal.