Abstract: The system comprises at least one teleprinter station (1) connected to an exchange (3) by means of a transmission-reception line (2) and comprising a polarity detector (31) for the line circulating current, and a device (30) for reversing the connection of the line wires. If the wires erroneously become reversely connected following maintenance work on a line of single current type, then false call and conversation signals are generated which automatically trigger a checking operation in which the polarity detector is suitably examined under control of a ROM routine E controlling a CPU 84. If the current is found to be the reverse of the correct current, the reversing device is operated in order to reverse the polarity of the connection. In contrast, in the case of a double current line, the reversing device is operated when current is absent in the reception line, thus indicating an erroneous line connection. If the line current interruption is prolonged, a warning device (28) is activated.

Abstract: The device comprises a carriage mobile radially relative to the disk, and on which lower and upper opposing magnetic heads are mounted, each for recording and/or reading a corresponding disk face. The upper magnetic head is resiliently mounted at the end of an arm pivoted to the carriage and is urged against the disk with a predetermined load determined by a spring. A flexible joint enables it to rotate in all directions about a central support. The lower magnetic head is connected to the carriage by means of a pair of parallel leaf springs which enable it to move along an axis normal to the plane of the disk without rotation, whereby both heads maintain good contact regardless of the height of the nominal plane of the disk.

Abstract: A dispenser for rolled flexible sheet material, wherein several plies of material fed from multiple source rolls are jointly cut while passing over a feed roller associated with a cutter, has a retarding force applied to the exterior of one source roll at a point remote from the point where such roll rests on the feed roller of the dispenser such that the interengagement between the web plies is enhanced to enable their being jointly cut by the cutter without undue slippage between the web plies.

Abstract: This invention is directed to a clam shell type image forming device whereby the upper unit is pivotally mounted with respect to the lower unit. Conversely, the upper unit is latched into a lower portion with the lower unit. If desired, however, the upper unit can be rotated to an upper position at a fixed angle. This is desirable, for example, if the operator must remove jammed paper from the device as to, otherwise, repair any defects. The invention utilizes a latching handle which permits the operator to unlatch the upper unit from the lower unit. The handle is not permitted to operate unless the carrier is moved to its predetermined position.

Abstract: A miniaturized switch particularly suitable for electronic keyboard control applications has a pair of contact members providing spaced contacts, a conductive floating contactor disposed in the space between such contacts adapted to engage both of the contacts to close the switch, a resilient sleeve enclosing the contacts and the space therebetween to encircle the contactor, and actuator means to displace the contactor within the sleeve relative to the contacts to effect closing of the switch.

Abstract: A scroll type fluid displacement apparatus is disclosed. The apparatus includes a housing. A fixed scroll member is fixedly disposed within the housing and comprises a first end plate means from which a first wrap means extends. An orbiting scroll member comprises a second end plate means from which a second wrap means extends, and is supported for orbiting motion within the housing. Both wrap means interfit at an angular and radial offset to make a plurality of line contacts to define at least one pair of symmetrically disposed, sealed off fluid pockets. The first end plate means is formed with two holes which are placed at symmetrical positions to be simultaneously closed by the axial end surface of the second wrap means. These two holes are connected to one another by a passage means. The pressure in the sealed off fluid pockets is thereby equalized at the time the pockets are sealed.

Abstract: A deflection yoke for a color cathode ray tube is disclosed which does not cause raster distortion and avoids electron beam convergence error. Both horizontal and vertical deflection coils generate fields having a pincushion distribution. Front end magnetic members extend the pincushion type vertical deflection magnetic field toward the viewing screen of the tube. Rear end magnetic members deform one portion of the magnetic field generated by the vertical deflection coils into a barrel type so that the sum of the vertical deflection magnetic field is effectively a barrel type distribution.

Abstract: A fabric having anti-static properties being formed from a first woven layer of polymeric fabric, a second woven layer of polymeric fabric which contains spaced threads of staple metal fibres and an intermediate layer positioned between the first and second layers to form a moisture barrier. In its most preferred form the woven polymeric fabric is formed of woven polypropylene and the spaced threads of staple metal fibres are formed of staple stainless steel fibres carried on a central core of a synthetic material. The fabric is of particular use in the manufacture of intermediate bulk containers where it is believed is advantageous in permitting corona discharge at a very low voltage of static electricity thereby preventing any dangerous build-up of voltage which subsequently is discharged by a spark.

Abstract: The device comprises an electrically insulating ink container containing one electrode and a counter-electrode disposed adjacent to the jet nozzle which is laser-bored through the container cover plate. The two electrodes are excited by a voltage pulse such as to generate a spark between the ink meniscus and the counter-electrode, and to expel a plurality of ink particles, rather than a single blob. The ink can be kept in circulation between the container and a reservoir 51 by means of a pump. The meniscus can be kept outside the nozzle by means of a second nozzle coaxial to the first, or by a suitable arrangement of the ink hydraulic circuit. In the case of magnetic ink, the meniscus is pulled back by a magnetic field. The ink can also be brought in front of the nozzle by capillarity.

Abstract: A dry etching apparatus for semiconductor wafers has a decompression vessel, the inside of which is divided by a separating wall into a discharge room and a shield room. The discharge room has a pair of elecrodes between which RF electric power is applied. One of the electrodes is placed at the separating wall and supports the wafer which is to be etched. A magnet assembly in the shield room generates a magnetic flux in the discharge room which perpendicularly intersects the electric field between the electrodes. A reactive gas is introduced into the discharge room, however, no discharge occurs, because its pressure is maintained below that required for discharge. This results in a reduced consumption of electric power, less heating, and less damage to the resist mask on the wafer.

Abstract: A striker mechanism for a high speed serial printer, for example of the daisy wheel type, includes a hammer movable axially towards the platen under the action of an electro-magnet whose armature carries a striker, and against the action of a return spring. Two lubricating felt pads are arranged on opposite sides with respect to the striker hammer and are pressed against the hammer by the grip of a spring for damping the hammer vibrations during the printing cycle. The armature comprises a pivoted lever which is damped with respect to its pivot by means of a felt washer and the lever is damped on return by a helical spring on a rod with a reduced diameter center section where it is struck by a pad on the lever.

Abstract: The printer comprises a solid or liquid ink jet head 100 arranged to print open dot at a time on paper running over a platen 80. The head is carried by a carriage 48 movable transversely with simple harmonic reciprocating motion. In order to reduce the effect of inertial forces when the carriage reverses its movement, the drive is effected by an eccentric peg 70 on a disc 276, the peg engaging in a guide slot 54 of the carriage perpendicular to the direction of reciprocation. An eccentric cam track 71 in the disc engages a peg 92 on a counter-weight 90 for counterbalancing the inertial forces of the carriage. In order to synchronize the printing operation with the carriage movement, an optical strobe disc 258 is rigid with the disc 276 and has slots 258 disposed at a pitch varying according to the harmonic motion. The platen 80 is rotated intermittently by a helical cam 277 carried by the disc 276 and a peg wheel 280, 281 .

Abstract: There is disclosed a method of rolling flat plate using a cylindrical mandrel and a plate gripper to form a pipe having a low pipe diameter to plate thickness ratio by forming a notch or recess in the plate edge to be gripped so that the combined radial dimension of the notched plate edge and gripper is no greater than the plate thickness.

Abstract: An oil-in-water anionic bituminous emulsion is disclosed wherein an anionic emulsifier is prepared by reacting lignosulfonate with a sulfonyl chloride or bromide of benzene or toluene or substituted benzene or an aliphatic hydrocarbon with four or more carbon atoms.

Abstract: The muting circuit of the present invention comprises a first and second differential amplifier. The first differential amplifier comprises first and second transistors. The base electrode of the first transistor receives an input signal. The second differential amplifier comprises third and fourth transistors. The collector electrode of the third transistor is connected to the collector electrode of the second transistor, while the collector electrode of the fourth transistor is connected to the collector electrode of the first transistor. A switching circuit, receiving an intercepting signal, is coupled to the first and second differential amplifier. In the absence of an intercepting signal, the switching circuit causes the conduction of the first differential amplifier, and while cutting off the second differential amplifier. Upon receiving an intercepting signal, the switching circuit cuts off the first differential amplifier while it causes the conduction of second differential amplifier.

Abstract: A novel hydroxy-cinnamic acid ester hydrolase can be obtained by cultivating, in a medium, a mold strain belonging to Genus Aspergillus or Genus Botrytis and having an ability to produce a hydroxy-cinnamic acid ester hydrolase specifically hydrolyzing the ester linkage of hydroxy-cinnamic acid ester substances represented by the following general formula: ##STR1## wherein R is hydrogen atom, hydroxyl group or methoxyl group and X is tartaric acid residue or quinic acid residue, followed by collecting the hydroxy-cinnamic acid ester hydrolase from the cultivated product.

Abstract: An improvement in refiner discs for mechanical pulping of wood and other material is disclosed which increases wood pulp production. The improvement has at least one refiner plate set mounted on a disc to form a pair of opposing refiner plate sets. The one refiner plate set has a series of hard spots placed at different radial distances on the surface. In one process of manufacturing the plate set, a series of locations are hardened, preferably by spot welding or spot hardening on at least one raised portion of the plate set.

Abstract: A coupling for coaxially joining pipe or rod sections employed with an earth boring drive unit includes telescopically interengageable male and female members having mating irregular cross sectional portions drivingly cooperable to transmit torque between said members and releasable locking means carried by said members to lock them against axial separation from each other, such locking means including an outwardly biased latch pivotally mounted in a pocket on the exterior of the male member and an inwardly opening recess on the interior of the female member into which the latch moves and lockingly engages when the members are telescopically interengaged for transmitting axial tension loads through the coupling.

Abstract: A method and system for recovering heat in a pulp digesting process is disclosed. The method includes the steps of blowing a pulp and liquid mixture from a digester to a container such as a blow tank or blow cyclone; transferring flash vapor above a predetermined pressure, which is above atmospheric pressure, from the blow tank to a pressure accumulator; transferring flash vapor below the predetermined pressure from the blow tank to an atmospheric accumulator; and mixing the flash vapor with a processing liquid in the pressure accumulator.