摘要:
Motor control apparatus is described that is used in a printer that prints on a paper web (32) coming from a roll (13) of paper and has two-sided printing capability using two print mechanisms (14, 15). The motor control apparatus controls power to several DC motors that either move the paper web from a roll through the printer or provide back tension to the paper web (32). The control circuits sense paper travel speed and motor loading and thereby sense the effects on paper tension caused by others of the control circuits. The interaction of motor torques provided by the control circuits maintains constant tension on the paper web (32) throughout the printer and thereby assures that there is front to back printing registration on each two-sided printed sheet, and also assures that there is top to bottom centering registration of printing on each sheet of paper when the paper web is cut into individual sheets of paper.
摘要:
The electronic equipment of a computer system including electronic cards, power supplies, peripheral units, cooling units and internal and external cables are compactly packaged within a small enclosure in a way which permits sufficient airflow from front to rear of the enclosure. The enclosure includes a pair of rail members located at the rear which have a plurality of mounting positions for attaching a corresponding number of modular shelf members which are angled to permit the flow of air through established airflow paths. The rail and shelf members collectively form a bulkhead structure. The rail members are offset from the sides of the frame so as to form vertical channels on each side. The channels are used for retaining external cables which plug into connectors mounted on the shelf members and are distributed so as not to interfere with airflow.
摘要:
Motor control apparatus is described that is used in a printer that prints on a paper web (32) coming from a roll (13) of paper and has two-sided printing capability using two print mechanisms (14, 15). The motor control apparatus controls power to several DC motors that either move the paper web from a roll through the printer or provide back tension to the paper web (32). The control circuits sense paper travel speed and motor loading and thereby sense the effects on paper tension caused by others of the control circuits. The interaction of motor torques provided by the control circuits maintains constant tension on the paper web (32) throughout the printer and thereby assures that there is front to back printing registration on each two-sided printed sheet, and also assures that there is top to bottom centering registration of printing on each sheet of paper when the paper web is cut into individual sheets of paper.
摘要:
A printer apparatus having two-sided printing capability is taught. Two printing mechanisms (14, 15) are provided that can simultaneously print both sides of roll paper (13). The printing mechanisms are physically oriented with respect to each other and to a simple paper handling/routing mechanism comprised of rollers so that when only one printing mechanism (14) is installed to provide only one-side printing, the paper handling mechanism need not be modified but the roll paper (13) is merely routed differently around the rollers. Retroactively, a second printing mechanism (15) may simply be installed in the printer for two-sided printing and the roll paper is routed around the rollers differently to route the roll paper to and from the second printing mechanism.
摘要:
Un trajet d'acheminement d'adresses qui transfère des adresses en provenance d'une pluralité de sources comprend un circuit incrémentiel. L'adresse comprend une pluralité de bits d'adressage et de bits intégrité. Les bits d'adressage sont appliqués au circuit incrémentiel alors que les bits d'intégrité sont appliqués en parallèle à un dispositif logique programmable (PLD). Pendant que l'adresse est transférée ou incrémentée, selon les besoins, le PLD génère indépendamment une pluralité de bits transformateurs définissant une caractéristique du nombre de bits d'adressage dont il est prévu que l'état va changer. Les bits tranformateurs sont ensuite utilisés pour transformer les bits d'intégrité d'adresse afin de les transférer avec l'adresse incrémentée. L'adresse incrémentée, les bits transformateurs et les bits d'intégrité sont logiquement combinés pour vérifier si l'adresse a été correctement transférée et/ou incrémentée.
摘要:
A connector for providing electrical connections for a coax cable harness, the coax cable harness including a plurality of coax cables, each coax cable having a wire encased in a dielectric and having a drain wire. The connector comprising an insulation displacement connector (22) having a plurality of insulation displacement contacts set (23) in a top surface of the insulation displacement connector. Each insulation displacement contact engages a corresponding wire encased in the dielectric, the insulating displacement contact piercing the dielectric thereby providing the electrical connection for the wire of the coax cable. An orientation bar (26) positions the coax cables to be in line with the corresponding insulation displacement contact, the coax cables resting on a top surface of the orientation bar. The orientation bar is positioned next to the insulation displacement connector such that a side surface of the insulation displacement connector is in contact or nearly in contact with the orientation bar. The orientation bar further has a plurality of holes (25) from the top surface which extend to a bottom surface of the orientation bar, each hole being positioned under the corresponding coax cable in order to permit the corresponding drain wire of the coax cable to be inserted through the hole with the end portion of drain wire bent across the bottom surface of the orientation bar. A ground termination block, (24) having a top surface placed opposite the bottom surface of the orientation bar and fixed against the drain wires bent across the bottom surface of the orientation bar, causes the drain wires to be in pressure contact between the ground termination block and the orientation bar, wherein at least one of the ground termination block of the orientation bar is made of an electrically conducting material.
摘要:
A color display graphics system includes three bit map memories for storing bits representing red, green and blue colors respectively. Combinations of bits from the same address locations of each bit map memory display a pixel which could be any one of eight colors: black, bleu, green, cyan, red, magenta, yellow or white. A read only memory (ROM) stores patterns made up of sixteen bits in a four-by-four matrix for each of the red, green and blue colors. The 16-bit matrices are stored in their respective bit map memories for subsequent color display. Combinations of matrices may be used to show shades of the above eight colors and the mixing of any of those shades.