摘要:
The position of a machine tool or the like is accurately obtained by an absolute value encoder. Light emission elements emit light which passes through scales containing optical patterns and is detected by light receiving elements. First, a signal detected by the light receiving elements while the light emission elements are extinguished is stored in memory. Then, the light emission elements are lighted and the signal detected by the light receiving elements is corrected by the previously stored signal.
摘要:
An absolute position detection apparatus which comprises sine and cosine wave generators for generating one or more sets of sine and cosine waves within a cycle, analog-to-digital converters for converting the incoming sine and cosine waves generated by the sine and cosine wave generators into digital values. An arithmetic unit is used for calculating a compensation for errors including offset, amplitude and phase errors on the basis of the digital values from the analog-to-digital converters. In the apparatus, the arithmetic unit operates on a phase angle from phase angles found by the arithmetic performed prior to or during said error compensations and the digital values from the analog-to-digital converters, whereby a low-priced, highly reliable absolute position detection apparatus can be achieved without the addition of compensation circuits to the hardware.
摘要:
An absolute-value encoder device for detecting a plurality of rotation quantities is disclosed. An A/B phase forming portion 610 forms an A-phase pulse signal and a B-phase pulse signal, based on light passing through a slit rotating together with a rotary shaft. One period of each of those pulse signals corresponds to one revolution of a rotary shaft. The A- and B-phase pulse signals are displaced in phase by 90° from each other. When an A/B-phase state detecting portion 640 detects a state change of each of those pulse signals, a clock forming portion 66 changes a frequency of a clock pulse signal to another frequency.
摘要:
A precision, high-resolution, absolute, multi-revolution encoder which allows a multi-revolution position value of a shaft to be detected with high reliability, using only a single revolution detector, and makes multi-revolution detection indirectly related to the accuracy of a rotary angle position signal. The output signal from the single multi-revolution detector is used, together with an inverted output signal, to increment and decrement corresponding up/down counters, based on the direction of rotation of the shaft. Each of the up/down counters is incremented or decremented at different points or zones of the shaft rotation so that the rotational value can be determined unambiguously. A conventional grey-code detector provides accurate angle values. The counters may exist as discrete hardware or integrated software embodiments.
摘要:
In a position detecting method and an apparatus therefor, a signal processing circuit including a semiconductor laser, a light receiving element and the like is arranged on the outside of a servomotor. An article to be detected is arranged within the servomotor. The signal processing circuit and the article are connected to each other by a single or a plurality of optical fibers. A laser light is applied to surface properties formed inevitably at processing of a surface of the article, to produce a signal of a reflected light. The signal of the reflected light and a beforehand stored position signal of the article are compared with each other so as to be converted into a rotational-angle signal, thereby detecting a position of the article.
摘要:
A catalyst used for producing, by catalytic gas phase oxidation of a C.sub.3 -C.sub.5 oelfin or tertiary alcohol, the corresponding unsaturated aldehyde and unsaturated carboxylic acid, said catalyst characterized by comprising molybdenum, iron and bismuth and having a specific surface area in the range from 1 to 20 m.sup.2 /gr, a pore volume in the range from 0.1 to 1.0 cc/gr and a pore diameter distribution in which the pore diameters are collectively distributed in the range of each of from 1 to 10 microns and from 0.1 to less than 1 micron; and a process for preparing said catalyst by charging an unfired material power into a centrifugal flow coating device to form particles having the average particle diameter of 2 to 10 mm and then firing the particles.
摘要:
This cemented carbide material for a surface coated gear cutting tool is employed in a substrate for a surface coated gear cutting tool which is obtained by forming a hard coated layer on a surface of the substrate, the cemented carbide material for a surface coated gear cutting tool includes a WC-βt-Co based cemented carbide, wherein a content of Co forming a binder phase of the cemented carbide material is in a range of 12 to 17 wt %, and among components of a βt solid solution forming a hard phase of the cemented carbide material, a content of components excluding WC is in a range of 15 to 20 wt %, and a total content of Ta carbonitride and Nb caronitride is in a range of 5 to 8 wt %.
摘要:
This invention has for its object to provide a matrix which finds application as a plant culture medium which is light-weight, possessed of large moisture and fertilizer holding capacities, easy to dispose of after use, and benign to the environment or a microorganism-immobilizing support capable of immobilizing a large population of microorganisms with remarkably improved long-term viability and providing for markedly improved colonization and growth rates. The matrix of this invention is composed predominantly of polysaccharide and lignin and has an internal pore structure.
摘要:
A metallic carrier for carrying a catalyst for cleaning exhaust gas and a production method thereof, produced from corrugated plates having a trapezoidal cross section and flat plates, both being resistant to high-temperature oxidation, joined by welding and soldering in the vicinity of the welded portions, which are strongly joined and can be used with no problems of telescoping even under heavy heat cycles and gas pressures.
摘要:
A process for producing an unsaturated aldehyde or an unsaturated acid comprises catalytically oxidizing propylene or at least one compound selected from isobutylene, tert.-butyl alcohol and methyl-tert.-butyl ether in a gaseous phase with molecular oxygen or a molecular oxygen-containing gas using a fixed bed multipipe reactor, wherein(a) a plurality of composite oxides, different in occupied volume, are used as catalyst,(b) a plurality of reaction zones are provided along an axial direction in each reaction pipe of the fixed bed multipipe reactor, and(c) the plurality of the catalysts different in occupied volume are filled in the plurality of the reaction zones such that the occupied volumes become lower from the starting gas inlet side to the outlet side.