Abstract: In prior art, through holes often have to be after-treated manually. Disclosed is a method allowing through holes to be after-treated in a chemical or electrochemical manner with the aid of a material-removing agent, the outer surface located around a discharge port of the through hole being protected accordingly from being attacked by the agent that is to be removed.

Abstract: A method and device is provided for controlling access to a resource by a bus master over a bus coupling the bus master to the resource. The resource includes an intelligent component that controls the operation of the resource. A series of packets is transmitted over the bus between the bus master and the resource, at a transmission speed controlled by the bus master. A request/response logic in the resource controllably throttles transmissions of the packets at the resource, at specified time intervals. Each of the time intervals is set at a time period to assure sufficient time for the intelligent component to complete processing tasks contained in the packets.

Abstract: The present invention relates to an extruder head with a rotary die which requires no ball or roller bearings. A die and a mandrel rod consisting of a cable guide are fixed in a cylindrical axial bore of an intermediate rotary sleeve driven by a driving mechanism. The sleeve has a substantially cylindrical outer surface which slidingly revolves in the axial bore of a distributing cartridge. The gliding surfaces are lubrified by the hot synthetic material. A clamping nut axially maintains the intermediate sleeve and allows the leakage flow of the synthetic material to be controlled. Such an extruder head may be utilized for the fabrication of helicoidal elements of synthetic material, especially helicoidal rods for optical fibers.

Abstract: Apparatus for extruding a sheath of synthetic material around a conductor, comprising an extruder head with two inlet conduits respectively connected to two orifices traversed by the conductor, and distributor means for selectively connecting the inlet conduits to a first and second extruder, the distributor means including a distributor communicating with the two extruders and to a first and second inlet conduit of the extruder head, and means for control of the distributor, the distributor having a mobile member which includes at least one pair of direct channels respectively providing communication of the first extruder with the first inlet conduit and of the second extruder with the second inlet conduit in a predetermined position of the mobile member, and a pair of inverted channels respectively providing communication of the first extruder with the second inlet conduit and of the second extruder with the first inlet conduit in another position of the mobile member.

Abstract: For machining the tooth flanks of a hardened workpiece having pre-formed teeth two cutting blades or plates are secured to a cutting blade or plate holder. The cutting blades or plates are provided with a base member or backing formed of a hard metal and a cover layer sintered thereon which is formed of cubic boron nitride. Each cutting blade forms a cutting surface and a clearance surface. Each individual cutting blade or plate is arranged at the cutting blade or plate holder in relation to the direction of the intended cutting movement such that the surface of the cover layer forms the clearance surface and an end face or surface of the cover layer is located in the cutting surface. Consequently, there is achieved the result that the cutting surface can be reground in the same manner as tools which, for example, are made of hardened steel and which are not provided with a cover layer.

Abstract: The invention relates to a process for the production of 1,4,5,8-tetrahydroxyanthraquinone or 5,8-dichloro-1,4-dihydroxyanthraquinone by reacting phthalic anhydride with p-chlorophenol in oleum and in the presence of a boron catalyst, to give the quinizarine boron complex, and chlorinating this boron complex direct with a chlorinating agent, in the same reaction medium, to give the boron complex of dichloroquinizarine, and subsequently hydrolyzing this chlorinated boron complex to 1,4,5,8-tetrahydroxyanthraquinone or 5,8-dichloro-1,4-dihydroxyanthraquinone.The novel process is environmentally and economically more advantageous than the sum of each of the individual process steps.

Abstract: A doubly dished or double-cone grinding wheel or a pair of singly dished or single-cone grinding wheels are reciprocated in strokes along the tooth flanks or a helically toothed gear wheel to grind the gear. The stroke motion is controlled in dependence of measured values of the generating motion and of the momentary position of the grinding wheel or wheel pair upon the tooth flank being ground. For this purpose, a grinding reference polygon determining the grinding stroke limits is constructed from the gearing specifications or data. An effective grinding point of the grinding wheel or wheel pair is then determined at short time intervals from measurements of the momentary generating and stroke position of the machine. The spacing of this effective grinding point from the subsequent grinding stroke limit in the grinding stroke direction is determined.

Abstract: In order to eliminate undulation errors in gear production wherein a generating motion of a gear-tooth flank of a gear fixed to a rotary table corresponding to an involute profile is induced by simultaneously imparting a predetermined rotary motion and a predetermined translatory motion to the rotary table, a reference ratio of these two speeds is determined, the momentary speeds of the table are measured and a momentary ratio is determined therefrom. A difference value is formed between the reference ratio and the momentary ratio. This difference value is first formed for each gear-tooth flank during one revolution and then stored in association with the momentary generating position of the gear and with the momentary stroke position of the gear-fabricating tool and only when the same gear-tooth flank is reached during a further revolution is the adjustment value of the gear-fabricating tool corrected by means of the stored difference values.

Abstract: In a gear tooth flank grinding machine operating on the indexing generating principle, a pair of dished grinding wheels is moved back and forth along the generatrices of involute gear tooth flanks, the grinding stroke being longer than the length of the generatrices by the amount of a supplemental dimension. The effective radius of at least one grinding wheel is measured at least once during the machining of each gear tooth flank and the grinding stroke is reduced in correspondence to the gradual reduction of the measured radius.

Abstract: The grinding wheel is axially displaceable by means of an axial drive for material removal or cutting operations and tooth flank corrections. The axial drive comprises a double-acting hydraulic piston-cylinder unit, the piston of which is formed at a spindle sleeve of a grinding wheel spindle and the cylinder of which is formed in a carrier or support sleeve. The cylinder is controllable by a servo-valve. A displacement or path measuring device is operatively associated with the spindle sleeve. The servo-valve as well as the displacement or path measuring device are connected to a displacement or path detection circuit which is connected to a program or operating control. There is thus realized a particularly sensitive and precise adjustment for the material removal or cutting operations and the tooth flank corrections.

Abstract: The invention relates to dyes of the formula ##STR1## wherein X is oxygen or sulfur, R is hydrogen or C.sub.1 -C.sub.4 alkyl, Y is an unsubstituted or substituted aryl radical, n is 1, 2 or 3, the benzene ring A may be substituted by halogen and the benzene rings B and D may each independently be substituted by halogen, C.sub.1 -C.sub.4 alkyl, C.sub.1 -C.sub.4 alkoxy or a radical of the formula --O--CH.sub.2 CH.sub.2 --O--R.sub.1, wherein R.sub.1 is hydrogen, methyl or ethyl. These dyes are suitable for dyeing or printing natural or synthetic polyamide fibres.

Abstract: The generating method is accomplished at a machine containing one or two tools, constructed to possess a disk, cone or double-cone configuration, which are moved to-and-fro in a stroke-like fashion along the tooth flanks and can be advanced in the direction of the tooth flanks and act at one or two work locations upon a respective tooth flank. The displacement of the tool or each tool needed for producing the profile and longitudinal corrections is determined for each work location at the field of action or engagement zone of the teeth and is controlled as a function of the generating position and the stroke position of the machine tools according to predetermined functions.

Abstract: An indexing generating method for grinding gears having an involute-shaped tooth flank profile, wherein there are accomplished between a dished or plate-shaped grinding wheel and the gear teeth to-and-fro generating movements as well as feed or advance movements in the tooth lengthwise direction, adjustment movements for compensating for the wear of the grinding wheel, and, finally, indexing movements. The grinding wheel is advanced between two respective indexing movements, independently of the magnitude of the adjustment needed for compensating for wear of the grinding wheel, by such an amount towards the tooth base or bottom land that also such tooth base is ground.

Abstract: An apparatus for grinding gears having an involute-shaped tooth flank profile, wherein there are accomplished between a dished or plate-shaped grinding wheel and the gear teeth to-and-fro generating movements as well as feed or advance movements in the tooth lengthwise direction, adjustment movements for compensating for the wear of the grinding wheel, and, finally, indexing movements. The grinding wheel is advanced between two respective indexing movements, independently of the magnitude of the adjustment needed for compensating for wear of the grinding wheel, by such an amount towards the tooth root that also such tooth root is ground.

Abstract: A gear tooth profile testing apparatus has a pair of displaceable measuring devices, one of which is movably mounted on an adjustable base plate and has the other device movably mounted on it. A probe mounted on said other device has biassing means urging it against the profile under test. Drive means displace one of the devices, which transmits signals of relative movements between the two devices to a computer. The computer receives from the other device signals of its movements relative to the base plate. The computer compares these measurements of probe movement with reference values to evaluate deviations in the measured profile.

Abstract: A flow machine for pumping and/or measuring the flow of agressive, radioactive, or special-purity flow mediums. The flow machine is provided with a rotatable impeller magnetically supported within a machine casing such that the impeller is spaced at all points from the inside walls of the machine casing. The casing inside walls and the outer configuration of the impeller include a central cylindrical center section joined by conically outwardly flared end sections. Electromagnetics are arranged in the conical flared section outside of the inside wall for cooperation with magnetic material arranged in the corresponding conically flared sections of the impeller to support the impeller in position. The conically flared section facilitate both radial and axial support of the impeller, since both axial and radial components of electromagnetic force is experienced at the conically flared sections of the impeller.