Abstract: An I/O unit has a fixed unit such as a housing provided with a multiplicity of connection terminals and an LED display module unit. A mounting/dismounting unit is provided with a terminal block including connection terminals to be coupled with the connection terminals of the fixed unit. The mounting/dismounting unit has a hinge disposed at an end thereof and the fixed unit has a pin and a grip capable of being engaged with the hinge. The grip is pulled out to a position to be used and then further pulled out, whereby the mounting/dismounting unit is forced out, drawing an arc about the pin and separated from the fixed unit. With this arrangement, an I/O module with a mounting/dismounting unit capable of being easily removed is provided.

Abstract: A PLC (programmable logic controller) processor which carries out logical operations. The processor comprises a logical operation unit (2) for executing a logical operation, a jump inhibition unit (3), a jump condition checking unit (4) for checking whether or not a jump can be carried out while omitting executions of subsequent instructions, and a jump instruction execution unit (5) for executing the jump instruction. When the result of the checking by the jump condition checking means (4) indicates that subsequent instructions need not be executed and the jump should be carried out, the jump instruction execution means executes the jump, whereby unnecessary instructions are not executed, thus the speed of the logical processing is increased.

Abstract: A metal strip is continuously cast through a gap of a pair of internally cooled rolls rotating in the opposite direction to each other having a pair of side dams disposed on both sides of the rolls and a pair of longitudinal dams disposed with their bottom surfaces held slightly above the roll surfaces so that openings are formed between the bottom surfaces of the longitudinal dams and the roll surfaces and that during steady state operation of the apparatus the openings are positioned at a level of the surface of molten metal in the pool. The longitudinal dams are capable of preventing formation of triple point solidified shells and make it possible that the surface of molten metal may come in contact with the surfaces of the rolls while forming the transversely uniform contacting edges, and therefore, the apparatus produces metal strips having enhanced surface quality which are substantially free from molten metal wrinkles.

Abstract: A twin roll continuous casting apparatus for continuously casting a metal strip through a gap of a pair of internally cooled rolls rotating in the opposite direction to each other having a pair of side dams disposed on both sides of the rolls wherein each side dam is made of an abradable refractory and forcibly fed in the casting direction, and wherein portions of the circumferential surfaces of the rolls contacting the side dams are formed into rough surfaces having an abrading ability and each of said portions having rough surfaces comprises a member removably fixed to the entity of the roll.

Abstract: Disclosed is an externally extended programmable controller in which a part of a control function is independently provided as an external unit, which comprises a main programmable machine controller (PMC) (2) contained in a numerically controlled apparatus (CNC) (1) and controlled in response to commands from the numerically controlled apparatus (1), an I/O unit (3) connected to the main PMC (2) for transmitting and receiving signals to and from a mechanical unit A (61), and an extended PMC connected to the main PMC unit through the I/O unit (3) for controlling a particular mechanical unit by an independent sequence program, and the extended PMC (4) independently contains a sequence program for a mechanical unit B (62) to be controlled, and controls the mechanical unit by transmitting and receiving commands and various data to and from the main PMC (2) by a communication means.

Abstract: Proposed herein is a twin roll continuous casting apparatus for continuously casting a metal strip through a gap of a pair of internally cooled rolls rotating in the opposite direction to each other having a pair of abradable side dams disposed on both sides of the rolls so that at least a portion of the thickness of each of the side dams is located on the circumferential surfaces of the rolls to form a pool of molten metal on the circumferential surfaces of the rolls, and a mechanism for feeding each of the side dams in the casting direction, each side dam comprising an assembly of successively stacked unit blocks in which one unit block except for the lowest one is placed one another unit block so that no clearance is formed between the lower end of the former and the upper end of the latter, portions of the circumferential surfaces of the rolls contacting the side dams being formed into rough surfaces having abrading ability.

Abstract: A twin roll continuous casting apparatus for continuously casting a metal strip through a gap of a pair of internally cooled rolls rotating in the opposite direction to each other having a pair of side dams disopsed on both sides of the rolls wherein each side dam comprises an upper dam which is made of an abradable refractory and forcibly fed in the casting direction and a movable lower dam which is disposed near the narrowest position of the rolls and caused to move synchronously with the strip being cast in the same direction, whereby the casting proceeds while bottom surfaces of both the upper dams are abrasively worn by circumferential surfaces of the rolls.

Abstract: A programmable logic controller (PLC) device for effecting arithmetic operations of a sequential program by a microprocessor (1). The PLC device comprises a periodic signal generating circuit (2) for generating an interruption signal at a predetermined time interval, an input circuit (7) for receiving an external input signal, and circuits for effecting filter processing by reading a signal output by the input circuit at a predetermined time interval in response to the interruption signal. Since the filtering processing is effected by the microprocessor, a time constant of a filter can be changed by a program and can be also changed for each signal.

Abstract: A twin roll continuous casting apparatus for continuously casting a metal strip through a gap of a pair of internally cooled rolls rotating in the opposite direction to each other having a pair of abradable side dams disposed on both sides of the rolls wherein a vessel for a pool of molten metals provided, at least a portion of the bottom or sides of the vessel slidably contacting the circumferential surface of the lower roll.

Abstract: A programmable logic control (PLC) device for executing a logical operation process of a sequence for program. The PLC device includes a PLC control unit (10) and a high speed input/output module (20) capable of executing a logical operation at a high speed in response to an external input signal and externally outputting a result of the logical operation, whereby an external signal to be processed at high speed can be processed without using a special processing unit.

Abstract: Disclosed is a fluid treating apparatus of hollow fiber type. The apparatus can prevent channeling or stagnation of the fluid which flows inside it by specifying the densities of the hollow fibers and the warps forming a hollow fiber sheet and the laminating conditions for laminating the hollow fiber sheets to form a laminate which is to be housed in a housing.

Abstract: The invention relates to a numerical control system equipped with a computerized man-machine interface controller (MMC unit) and including an NC unit (11), a programmable machine controller (13) for executing at least sequence control based on signals from the NC unit (11) and a machine tool (12), a computerized man-machine interface controller (14) having at least a CRT (14d) and a keyboard (14e), and a data exchange controller (15), wherein data are exchanged among the NC unit (11), programmable machine controller (13) and man-machine interface controller (14) under the control of the data exchange controller (15).

Abstract: Disclosed herein is a process for producing 2,6-dihydroxynaphthalene which comprises oxidizing 2,6-di(2-hydroxy-2-propyl)naphthalene in acetonitrile, 1,4-dioxane or a mixture thereof with hydrogen peroxide in the presence of an inorganic acid or a solid acid at a temperture in the range of room temperature to the boiling point of the solution of the 2,6-di(2-hydroxy-2-propyl)naphthalene in acetonitrile or 1,4-dioxane, the acetonitrile, 1,4-dioxane or a mixture thereof being used in an amount of 3 to 30 ml to one gram of the 2,6-di(2-hydroxy-2-propyl)naphthalene.

Abstract: A continuous casting apparatus for continuously casting metal strip through a gap between a pair of opposite internal cooling rolls rotating in the opposite direction to each other, wherein side dams have the bottom surfaces contacting the circumferential surfaces of both rolls and made of refractories having satisfactory abrasiveness, and a mechanism is provided for feeding the side dams in the casting direction at a predetermined speed, the circumferential surface portion of the roll contacting the side dam being formed into a rough surface having grindability, whereby the movement of the side dam by the feeding mechanism is carried out through the wear of the side dam caused by the grinding of the rough surface.

Abstract: A graphic is prepared by providing the starting points or end points of straight lines and circular arcs with identifiable marks such as black circles. Reading the graphic by an image reader (2h). A display controller of a display unit (2d) displays each of the graphic elements and black circles on a display screen as well as inquiries calling for the coordinates of the positions at which the black circles are provided and the nature of the graphic elements between black circles. The black circles relating to inquiries are made distinguishable from other black circles by being displayed in e.g. blinking fashion. Thereafter, the coordinates of a black circle which is made to blink and the nature of a graphic element (i.e. whether the element is a straight line or circular arc) are inputted from a keyboard (2f) in response to the inquiries, whereupon the next black circle blinks and the relevant inquiry is displayed.

Abstract: In a twin roll system continuous casting machine for continuously casting a steel plate through a gap between a pair of internal cooling rolls rotating in the opposite direction to each other, a continuous casting apparatus for steel plate comprises side dams installed on both sides of the pair of rolls to form a pouring basin on the circumferential surfaces of the pair of rolls, the side dams consisting of fixed side dams contacting molten steel in the pouring basin and movable side dams installed below the fixed side dams and substantially without contacting the molten steel in the pouring basin and moving in the same direction as the cast plate.

Abstract: A twin-roll type continuous casting apparatus comprises a pair of rotatable drums and a pair of side dams disposed on both axial ends of the drums so that a pool of molten steel is defined by the drums and the side dams. As the drums are rotated in counter directions, the molten steel is cooled so that the molten steel is partially solidified to form solidification shells which are then pressure-bonded to each other as they pass through the narrowest gap defined between the drums, so that a steel sheet is formed by continuous casting. The side dam is composed of a side refractory part which functions to maintain the pool of molten steel and a metallic member which supports the side refractory part and which serves as a cooling plate for cooling the steel.

Abstract: Apparatus for positioning and attaching a reinforcing ring in coaxial relationship to a floppy disk, includes a force translating mechanism mounted for movement to and from a resiliently mounted circular receiving member. A cylindrical positioning member, connected to the force translating mechanism, has first and second concentric reference surfaces corresponding respectively to the inner diameter of the reinforcing ring, which is carried by the force translating member, and the inner diameter of the floppy disk, which is disposed about the receiving member.

Abstract: Disclosed herein is a process for producing 2,6-naphthalenedicarboxylic acid, comprising (1) oxidizing 2,6-diisopropylnaphthalene in a lower fatty acid as a solvent in the presence of a catalyst comprising a water-soluble cobalt salt and/or a water-soluble manganese salt in an amount of at least 0.5 gram-atom of Co and/or Mn to 1 mol of 2,6-diisopropylnaphthalene by an oxygen-containing gas, thereby obtaining isopropylnaphthalene-monocarboxylic acid and (2) further oxidizing the thus obtained 6-isopropyl-2-naphthoic acid in the lower fatty acid in the presence of the catalyst comprising a water-soluble cobalt salt and/or a water-soluble manganese salt in an amount of from 0.0025 to 0.12 gram-atom to 1 mol of 6-isopropyl-2-naphthoic acid by the oxygen-containing gas, thereby obtaining 2,6-naphthalenedicarboxylic acid.

Abstract: Disclosed herein are the novel 6-substituted naphthalene-2-carboxylic acids represented by the formula (I): ##STR1## wherein X represents a hydroperoxy group or a hydroxy group, and a process for producing the 6-substituted naphthalene-2-carboxylic acid represented by the formula (I) by reacting 6-isopropylnaphthalene-2-carboxylic acid with molecular oxygen under heating in the presence of a salt of persulfuric acid as a catalyst in an aqueous alkaline solution.