Abstract: An optical glass which is a SiO.sub.2 -Nb.sub.2 O.sub.5 -R'.sub.2 O (where R' is an alkali metal element)-F system of a specific composition range exhibits optical constants of a refractive index (Nd) of about 1.52-1.67 and an Abbe number (.upsilon. d) of about 32-50, is free of PbO and has an improved light transmissivity.

Abstract: The present invention provides a method for recovering polymer agglomerates in the form of dry powders or granules comprising steps of:(A) coagulating a polymer latex obtained by emulsion polymerization or suspension polymerization to thereby form hydrous agglomerates in which latex particles are not fused together,(B) immersing the hydrous agglomerates in an organic liquid insoluble or hardly soluble in water which wets but does not dissolve or swell said agglomerates at a temperature lower than the temperature at which the latex particles constituting the agglomerates are fused together, to thereby substitute said organic liquid for the water contained in the agglomerates with the organic liquid,(C) thereby forming two phases; a water phase expelled from the agglomerates and an organic liquid phase in which the agglomerates are immersed,(D) separating the agglomerates from the organic liquid phase, and(E) removing by evaporation the organic liquid attached to the agglomerates, whereby the agglomerates are r

Abstract: A chemical cleaning method for removing scales and other substances deposited on the interior of a polymerization reactor used in emulsion polymerization or suspension polymerization. This method comprises chemically cleaning the interior using an aqueous solution or dispersion of an alkali agent and a surfactant. According to this method of cleaning, scales deposited on the interior of a polymerization reactor, in particular, scales deposited during polymerization on the inside surface, an agitator and baffle-plates of the reactor are completely removed.

Abstract: The present invention provides a method of manufacturing coagulated grains from polymer latex and apparatus for exercising this method, said method being characterized in that a swirl of polymer latex is produced in tank, while holding it at a temperature lower than the softening temperature of the polymer latex particles and while letting the same polymer latex as said polymer latex fall down into the aforementioned swirl liquid surface, a coagulant is added into said latex flowing-down liquid, thereby letting the coagulant disperse and scatter into the latex in the tank; thereafter, with said coagulant thus scattered as the seeds, coagulated layers are grown on their outer surfaces. According to this invention, nearly spherical coagulated grains with a uniform grain size may be obtained, while suppressing possible formation of massive coagulated matters.

Abstract: A cleaning method for removing scales, etc., deposited on the interior of a polymerization reactor which has been used in emulsion or suspension polymerization. This method uses a chemical cleanser comprising a soap builder an, alkali agent, an aqueous solution or dispersion of a surfactant, and an organic solvent and/or polymerizable monomer. This system may further contain a plastic packing such as tellerettes. By this method, scales deposited on the interior of a polymerization reactor, particularly, scales deposited on the inside surface, agitator, and baffle-plates of the reactor, are compeltely removed.

Abstract: An apparatus for cleaning a tank-like vessel comprising(a) a supporting arm attached to a fixing plate, which can perpendicularly extend downward,(b) a folding arm of which base portion is rotatably attached to the lower end of the supporting arm, a position of the folding arm being changeable between a housed position and a position in use wherein the folding arm is approximately horizontally stretched out,(c) a rope winded up and winded down by a hoist, and(d) a cleaning nozzle capable of injecting jet water in a two-dimensional direction or three-dimensional direction.

Abstract: The present invention provides polymer latex grains having latex particles which compose each coagulated grain compacted therein in the state of not being mutually fused; said grains are obtained by the following steps of (A)-(E):(A) into a polymer latex manufactured by emulsion polymerization or suspension polymerization, a coagulant is added at a temperature lower than the temperature (softening temperature) at which latex particles are adhered by fusion, to be dispersed and scattered in said polymer latex as minute volumes of said coagulant, before said coagulant has been dissolved and diffused into said polymer latex;(B) by letting said coagulant dissolve and diffuse into said latex from the scattered minute volumes of said coagulant, the latex particles are coagulated on the outer surfaces of the minute volumes of said coagulant as the centers, to have coagulated grains grow from inside out, thereby forming spherical grains of an arbitrary range of sizes regularly filled with the latex particles;(C) said

Abstract: This invention relates to a sewing machine control device which precisely and effectively stops a sewing machine at the termination point of a seam. The sewing machine control device comprises operation means (LSW) for producing an actuation signal or a stop signal, needle position detector means (NP), workpiece detector means (5, WS) operatively connected to said operation means and an electrical circuit operatively connected to said workpiece detector means. When the operation means drives or stops the sewing machine and the workpiece detector means detects the trailing end edge of a workpiece, the electrical circuit automatically stops the sewing machine.

Abstract: Disclosed is a method of producing coagulated colloidal particles with close-packed structure which comprises;(A) adding a coagulant to aqueous colloidal particles at a temperature lower than softening temperature of the colloidal particles under such conditions that said coagulant will be present in discrete units in the dispersion before it is brought into solution by diffusion;(B) allowing the molecules of coagulant to gradually diffuse from said coagulant units into the surrounding dispersion, thereby coagulating the colloidal particles on the surface of each coagulant unit, causing the coagulated particles to grow from inside to outside of each unit, and producing coagulated particles of desired size with regularly packed structure;(C) separating the coagulated particles thus formed from the dispersion; and(D) drying, or heating in an aqueous phase, the coagulated particles separated above at a temperature lower than the softening point of said colloidal particles.

Abstract: A control device for sewing machines includes an input device adapted to permit the input of different categories of information including program relative commands, unit sewing pattern relative commands, and numeric data and a discriminator capable of discrimination between a command for programming and one for program execution. The former commands are stored in a memory as program data and the latter commands are read out by means of a program read-out. In a comparitor, the read-out program data are compared with the actual data detected by a detector such as the number of stitches and the lock position of a needle arm. On the basis of this data, a fabric feed mechanism and a thread cut mechanism are ON/OFF controlled. Thus, a variety of sewing patterns can be programmed as required for subsequent readily effected and efficient execution so that operation can be optimal.

Abstract: Stitch patterns are converted into coordinate data by an optical scanner employing a charge coupled device (CCD) which provides multiple PN diodes internally (providing X-direction coordinates), and a pulse motor driven by a predetermined pulse (providing Y-direction coordinates). The coordinate data are stored in random access memory (RAM) via a central processing unit (CPU), thereby eliminating the conventional manual work of inputting data for each stitch point.

Abstract: A sewing control system for a sewing machine which comprises a count circuit for counting signals synchronized with the rotation of the sewing machine, a memory circuit for storing a reference value, a comparator circuit for comparing said reference value with the output value from said count circuit, an initializing circuit for initializing said count circuit only when there is a comparison output from said comparator circuit after said reference value is stored, and a circuit for outputting a sewing finish signal as data on the number of the works sewn only when there is a comparison output.

Abstract: A workpiece holding-down device for a sewing machine comprises a spring-loaded presser bar and foot assembly supported in the framework of said sewing machine, a drive mechanism for moving said assembly vertically, and a control circuit for controlling the movement of said presser bar. The foot assembly includes signal means for positioning the presser bar and foot assembly in a controlled position in response to the actuation of an operation member or stored information.

Abstract: A process for producing a coagulated latex is disclosed which comprises spraying into a coagulating chamber a suspension liquid or a high polymer latex to disperse as droplets, simultaneously spraying a coagulant into the chamber in the form of gas or mist, introducing into the chamber super-heated steam to heat dispersed droplets of the suspension liquid or the high polymer latex and the coagulant, collecting coagulated particles in a film-like flow of water or an organic solvent flowing downward along side walls and the bottom of the chamber, and recovering the coagulated particles.

Abstract: In a process of emulsion-polymerization in a polymerization system containing an acrylate or a methacrylate monomer at least 60%; the improvement which comprises carrying out the emulsion polymerization in a polymerization vessel having a film of a quinone-amine compound of not less than 3000 in average molecular weight on the inner vessel wall, said quinone-amine compound being prepared by addition-reacting an aromatic quinone and an aromatic diamine in a solvent medium having a solubility parameter of 9.0 to 12.2. According to the process, the polymer scale deposition can be prevented in the acrylate or methacrylate polymerization system.