Abstract: A method for fabricating an electrode assembly for solid polymer electrolyte fuel cells comprising a cation exchange membrane as the electrolyte and electrode catalyst layers, which utilizes specific perfuluorosulfonic acid copolymers for the cation exchange membrane and a binder used for preparing the electrode catalyst layers or bonding the cation exchange membrane and the electrode catalyst layers and provides electrode assemblies for the fuel cells being capable of providing fuel cells having a high cell voltage with high efficiency.

Abstract: A paper conveying device overruns a document from a stop position and then, switches the document back so that the end of the document collies with a document abutting member provided in the stop position. At this time, the amount of overrun and the amount of switchback of the document are respectively set to the minimum ones required, to reduce the stress applied to the document, and the most suitable control is carried out even in a special mode (SDF mode) in which the document conveying speed is low. More specifically, at the time of the SDF mode, even if a stop instruction is given at timing T2, timing at which a conveying motor is turned off is delayed by a short time .increment.T. A distance A' from the timing T2 to the time when the conveying motor is completely stopped is detected, and the conveying motor is rotated in the reverse direction by a distance B' equal to the distance A'. The conveying motor is rotated in the reverse direction by position control.

Abstract: Fluorine is recovered as calcium fluoride from a fluoroetchant solution composed mainly of hydrogen fluoride and ammonium fluoride using a sealed reaction tank equipped with a supply port for adding the fluoroetchant solution to the tank, a supply port for adding calcium carbonate to the tank, a vapor supply port for adding steam to heat the solution in the tank, an air supply port for providing air to aerate the contents of the tank, a stirrer for stirring the contents of the tank, an ejector for removing vapors from the tank connected to the tank via a mist separator for separating mist from the vapors being removed from the tank, and an exhaust port for removing calcium fluoride from the tank.

Abstract: Calcium fluoride with high purity of very small content of unreacted calcium carbonate and silica is recovered from an etchant mainly composed of hydrogen fluoride or hydrogen fluoride and ammonium fluoride. The etchant is reacted with calcium carbonate with transfer directions of the etchant and calcium carbonate being controlled within a composition region in which mole equivalent ratio of ammonium fluoride/hydrogen fluoride is specified.

Abstract: A serial printer comprises a printing head, a carrier for carrying the printing head, a platen, and a pair of guide members extending in parallel with the platen for supporting the carrier in a movable manner. An openable member is attached openably to the casing of the printer and supporting one of the guide members. Engaging receivers are formed in the carrier for allowing the one guide member to engage therewith and disengage therefrom in a direction substantially perpendicular to the extending direction of the one guide member. Engaging brackets may be mounted on the printing head for coming into and out of engagement with one of the guide members at a right angle with respect to the extending direction of the one guide member. Moving members may be supported movably in the casing of the printer for supporting the one guide member, when moved, to bring the one guide member into and out of an engagement with the engaging brackets.

Abstract: A dot printer includes: a platen and a printing head encased in a printer case in the vertical direction; a paper housing portion provided laterally of the platen; a feed roller disposed laterally of the printing head for feeding a paper taken out of a paper housing portion to the printing head; and a discharge roller disposed laterally of the printing head for discharging the paper outside of the case. With this construction, the printer can be made thin and can also be miniaturized.

Abstract: An FSK demodulator for demodulating first and second baseband signals obtained from a received frequency shift keying signal, the first and second baseband signals having a quadrature relation therebetween, a lead and lag relation between the first and second baseband signals being changed in accordance with frequency shift from a carrier frequency of the frequency shift keying signal, comprises: a voltage change judging circuit for judging whether a magnitude of the first baseband signal increases or decreases within a predetermined interval; and an inverting circuit responsive to an output of the voltage change judging circuit and the second baseband signal for outputting a demodulated signal produced by inverting the second baseband signal in accordance with the output of the voltage change judging circuit.

Abstract: A data receiving system comprising an I base-band signal and a Q base-band signal which are used in a quadrature demodulation operation. Zero-crossing points of respective base-band signals are detected and a control signal is generated in response to each zero-crossing point. A phase-shift switching circuit alternately selects either the I base-band signal or the Q base-band signal in response to the control signal to generate an I/Q base-band signal. And, a demodulation operation is executed on the basis of the I/Q signal.

Abstract: There are provided a modulation circuit (9) and a signal processing circuit (2) on the same chip. The modulation circuit (9) modulates an input signal (30) to apply it to a selector (8). The selector (8) selectively applies to the signal processing circuit (2) either the input signal (30) or a modulated signal (40) in accordance with a select signal (50). The modulation circuit (9) is synchronized with the signal processing circuit (2) by a timing signal (11) from the signal processing circuit (2). For this reason, there is no need of an equipment for synchronizing the signal processing circuit (2) and the modulation circuit (9) in the test. A test signal provided from the exterior need not have been already modulated. Therefore, the test signal can be easily produced and confirmed, and the compression rate of the test signal is improved.

Abstract: A paper cassette used in a printer for holding sheets of paper. The cassette comprises a case holding sheets of paper and corner claws mounted at both sides of the front end of this case. The claws engage the front ends of the corners of the uppermost sheet of paper. The claws have front walls which are inclined upwardly toward the direction in which the uppermost sheet is fed. The front walls are also inclined from the front end of the uppermost toward the direction in which the walls are distant from the front end of the sheet by slow degrees toward the inside of the widthwise of the sheet. When the uppermost sheet is curled, the corners of the front end of the sheet are disengaged from the corner claws certainly.

Abstract: A paper feeding system that eliminates a mechanism for interrupting driving force to picking rollers to lower the cost of the system and to secure the feeding of papers. Corner nails are supported in a manner displacable up and down on the both sides of the front end portion of a paper cassette and the front corner portions of papers stored within the paper cassette can be anchored by the corner nails. A projecting part of the corner nails abuts to a stopper to restrict its upper limit position. When the paper is not fed, the picking rollers are in an up position and are separated from the paper and the corner nails retain the paper at a certain height position engaging with the front corner portion of the paper. When the paper is fed, the picking rollers go down to a down position to press the paper against biasing force of a bias spring and the corner nails are separated from the stopper and contact with the front corner portion of the paper in the down position.

Abstract: A motor control device carries cut feedback control of a motor such that the rotational speed of the motor is equal to the command speed. A control voltage is first calculated as the sum of a first constant times the difference between the command speed and the actual rotational speed, a second constant times the actual rotational speed and a predetermined offset value. The calculated control voltage is corrected on the basis of the phase difference between the command speed and the actual rotational speed and a voltage after the correction is outputted as a motor control voltage. The rotational speed of the motor can be caused to rapidly follow the target speed by adjusting the first and second constants and the offset value whether the command speed is relatively low or high, thereby to make it possible to control the motor at a constant speed.

Abstract: An error detecting unit for a rotational detector which outputs two kinds of pulse signals whose frequency according to rotation is equal and whose phase is different including counters for detecting whether or not either a rising or a falling edge of the two kinds of pulse signals appears alternately so as to detect an error of the corresponding rotational detector.

Abstract: Herein is disclosed a vulcanizable rubber composition comprising a copolymer rubber constituted of ethylene, propylene and nonconjugated polyene, wherein ethylene/propylene molar ratio is 78/22 to 97/3 and the total content of propylene and nonconjugated polyene is 6 to 30% by mole in said copolymer rubber. By the use of the rubber composition of the present invention, a vulcanized product excellent in tensile strength, heat resistance, oil resistance, compression set resistance and flex behavior can be obtained. The vulcanized product can be used as automobile parts and other innumerable articles such as socket cover, heat resistant hose, electric wire, condenser cap, heat resistant belt, vibration-proof rubber, hoses, weather strip, seal sponge, black side wall of tire, etc.

Abstract: Disclosed herein is a thermoplastic resin composition which comprises:(a) polyphenylene ether or a composition containing polyphenylene ether,(b) (i) a modified propylene polymer grafted with a styrene-based monomer or a mixture of a styrene-based monomer and a monomer copolymerizable with the styrene-based monomer, or (ii) a composition containing said modified propylene polymer and a propylene polymer,(c) a rubbery substance, and at least one component selected from the following three components;(d) a styrene resin having a melt index of 8 or above (at 250.degree. C. under a load of 5 kg),(e) a low-molecular weight hydrocarbon resin, and(f) white oil and/or liquid paraffin.This thermoplastic resin composition exhibits not only good moldability but also well-balanced physical properties and heat resistance, and can be easily processed into molded articles having outstanding physical properties.

Abstract: Herein is disclosed a vulcanizable rubber composition comprising a copolymer rubber constituted of ethylene, propylene and nonconjugated polyene, wherein ethylene/propylene molar ratio is 78/22 to 97/3 and the total content of propylene and nonconjugated polyene is 6 to 30% by mole in said copolymer rubber. By the use of the rubber composition of the present invention, a vulcanized product excellent in tensile strength, heat resistance, oil resistance, compression set resistance and flex behavior can be obtained. The vulcanized product can be used as automobile parts and other innumerable articles such as socket cover, heat resistant hose, electric wire, condenser cap, heat resistant belt, vibration-proof rubber, hoses weather strip, seal sponge, black side wall of tire, etc.

Abstract: Disclosed is a polypropylene resin composition which is superior in mechanical strength and affords molded articles having good appearance which comprises (A) a crystalline polypropylene, (B) a polypropylene modified with an unsaturated carboxylic acid or an acid anhydride thereof, and (C) a zinc oxide whiskers. When the composition additionally contains an inorganic filler such as glass fibers, molded articles further improved in appearance can be obtained. The zinc oxide whiskers preferably have a tetrapod type crystal structure.