Abstract:
The control of ink jet printing must deal with rapid starting and stopping of the ink fluid to provide for both correct and high speed printing. Ink droplet ejection is controlled by means of cylindrically-shaped pressure waves generated in the ink close to the nozzle (18). A pair of electrodes (10, 12) is provided in the ink chamber (14) with an insulated conductor (22) extending therebetween and the pressure waves are generated as a result of interaction between discharges between electrodes and the magnetic field produced around the conductor (22) as current flows therethrough, The principal use is an ink jet printer.
Abstract:
A dot matrix printer in which, for the purpose of supervising the quality of the printing of dot matrix characters, an optical sensor (32) is provided for each dot producing element (11) of a print head (5). Each optical sensor (32) includes two glass fibers (34, 36) to carry light from a light-emitting diode to the surface of a record medium and to carry the reflected light to a photodiode. Each printed dot is detected and the sensor output is compared with a delayed or stored print signal which is applied to the drivers for the dot producing printing elements (11). The print head (5) may either be a wire matrix or an ink jet print head.
Abstract:
Procede et appareil de selection d'un element parmi une pluralite d'elements (20), tels que des chargeurs de donnees. L'appareil (10, 136) comprend une entree (66, 140) dans un organe stationnaire (18, 138) et des moyens de transport pour deplacer (22, 142) les elements dans une premiere et une seconde directions par rapport a l'entree, les moyens de transport comprenant un rotor (28) et une chaine (144, 146). Une porte de deviation (77, 214) est utilisee pour permettre a un element de passer au-dela de l'entree lorsque les moyens de transport se deplacent dans la premiere direction, et pour devier un element dans l'entree lorsque les moyens de transport se deplacent dans une seconde direction par rapport a l'entree. Une detection de position (72, 218) est utilisee pour determiner quel element parmi la pluralite d'elements (20) est situe dans une position predeterminee par rapport a l'entree. Lorsque le procede et l'appareil sont utilises dans un systeme de traitement de donnees, un element selectionne (20) est amene en engagement cooperant avec un dispositif de lecture/ecriture (78) situe dans la zone d'entree.
Abstract:
The invention is concerned with the problem of providing connections to leadless integrated circuit packages. A connector assembly (10) for connection to a computer backpanel (14) or the like includes a leadless integrated circuit package (16) and a connector receptacle (20) for receiving the leadless package (16). The leadless package (16) has two insulating layers (60, 62) and outwardly extending conductors (68, 72) formed on each of the two layers (60, 62). The insulating layers (60, 62) have contact coupling edges (70, 74), with the contact coupling edge (70) of one layer (60) extending outwardly of the contact coupling edge (74) of the other layer (62). Rows of contacts (40, 42) in the receptacle (20) make electrical contact with the conductors (68, 72) on the leadless package at the contact coupling edges (70, 74). The construction enables an increased number of external connections to be made to the chip (12) without a substantial increase in the surface area of the package (16). In a second embodiment, the connector assembly (10a) includes a leadless integrated circuit package (20a) having three insulating layers (60a, 62a, 92a) and outwardly extending conductors (68a, 72a, 90a) formed on each of the three layers (60a, 62a, 92a).
Abstract:
In order to measure execution of a program, exclusive of sub-routines that may be called by a program, without modification of the program or computer hardware, comparison means (13A, 13B) is coupled to a memory bus to compare all addresses occurring on the memory bus to an upper limit number (15) and a lower limit number (17) to produce a signal at (23) which indicates if each address occurring on the memory bus is within a range represented by the upper limit number and the lower limit number. The signal is utilized to either enable incrementing of a counter at a predetermined time rate or to increment the counter once for every new address occurring on the memory bus within the range. The contents of the counter represent either the accumulated time of execution of instructions having addresses within the range or the number of instructions executed having addresses within the range.
Abstract:
The invention is concerned with the problem of the package density which can be achieved using integrated circuit packages. An integrated circuit package (10) includes a plurality of contact pins (14) having a plurality of conductors (32, 34) thereon. In one embodiment, each pin (14) includes an insulating substrate (30) and a conductor (32, 34) on each of two opposing sides of the substrate (30). An external connector (42) for each pin (14) has two contacts (46, 48), one contact for engaging each of the two conductors (32, 34) on the pin (14). In other embodiments, each pin (114, 214) includes four conductors. An external connector (142, 242) for each pin (114, 214) has four contacts, one contact for engaging each of the four conductors on the pin (114, 214).
Abstract:
A method and apparatus for synchronizing a digital data demodulator to a received phase modulation carrier signal (42) in which the carrier signal is phase shifted during each modulation period of the carrier to represent one of four pairs of binary bits or dibits. A dibit clock (76) is adjusted to the phase of a reference dibit clock (66, RDCL) whose output is used to synchronize the demodulator in establishing the location of the modulation period of the incoming carrier. In order to overcome errors found in the decoding of the carrier signal, the adjustment of the dibit clock is suppressed when the dibits 00 and 10 are being decoded.
Abstract:
Ink jet printer (10) having a rotatable ink reservoir (12) for supplying ink to a print head (52) through a capillary ink supply line (48), which print head (52) is movable in rotary direction and is adapted to eject ink droplets on to a record medium (72) as the head (52) is moved past the record medium (72). The ink reservoir (12) has two cavities (28, 30), one of which (30) is connected to the print head (52) by the ink supply line (48). Valve means (36, 40, 42) are provided between the cavities (28, 30) to control the flow of ink therebetween such that ink is free to flow between the cavities (28, 30) when the ink reservoir (12) is at rest, but is prevented from flowing, due to centrifugal force, upon rotation of the ink reservoir (12). By virtue of this arrangement a major proportion of the total ink in the reservoir (12) is isolated from the ink supply line (48) during rotation of the reservoir (12), whereby a sufficient negative head is maintained at said print head (52) for proper operation of the printer (10).
Abstract:
An ink flow control means for regulating the supply of ink from an ink reservoir (24) to a bi-directionally movable print head (12) of an ink jet printer. The control means deals with the problem of rapid starting and stopping of the ink to minimize fluctuations thereof during print head (12) reversal in direction of movement. An ink flow control valve (30) interposed in the ink supply line (28, 32) is arranged to close by reason of inertial forces on the valve (30) when the print head (12) is decelerated and accelerated near the two ends of its travel.
Abstract:
A circuit (10) for controlling a display (12) in which selected characters are displayed at selected positions therein. The circuit (10) includes a memory unit (16) having a plurality of addresses (Po-P3) thereto and a processor (14) for writing character data in the memory unit (16) at the addresses, with the addresses corresponding to predetermined positions in the display. The memory unit also has a plurality of outputs which are operatively coupled to the display (12) to enable the display to generate characters corresponding to the associated character data at selected positions in the display when the addresses are selected. The circuit (10) also includes a counter unit (38) which is specially wired for selecting the addresses for the characters to be displayed. The display is divided into a high bank and a low bank of character positions, and the counter unit alternately addresses character positions in the high bank and the low bank. A control circuit (50) enables either the processor (14) or the counter unit (38) to address the memory unit.