Abstract: The invention presents a novel magnetic bearing device of a simple design and construction, so that it can be attached to the ends of the driving shaft of a synchronous motor or a servomotor. The device consists of: a rotor having a number of permanent magnets, mounted on a central shaft where the central shaft is connected to a driving shaft of a rotating load of an external apparatus; and a stator surrounding the rotor with an airgap. The stator of the bearing device is provided with a number of electromagnets on the inner circumference which can be energized successively so as to create a rotating magnetic field constituted by opposing or attracting polarities to the field effect polarities created by the moving permanent magnets. An integration of the vertical force components over the inner circumference of the stator provides the total magnitude of the levitation force to support the external load.

Abstract: A copying machine control apparatus which includes a first control means for actuating a first driving means which operates a photoconductive drum, a second control means for actuating a second driving means which operates a scanning means, and a third control means for actuating a third driving means which operates a transfer drum. Each of first, second, and third control means has a position controller and a speed controller, respectively, operated by a common reference pulse train, in which the position controller generates a position control signal to indicate the turning position difference at any moment, and the speed controller generates a speed control signal which is composed of a frequency difference between the common reference pulse train and the pulse train outputted from respective pulse encoders, then this speed control signal is added to the position control signal to generate a driving signal which actuates each of first, second, and third driving means, respectively.

Abstract: A system for driving a drum includes a pulse motor including an annular rotor fixedly mounted within the drum for rotation therewith and rotatable relative to a stator disposed within the rotor. The pitches of the rotor teeth and stator teeth are determined in such a manner that a magnetic flux linking each of the coils is changed in a sinusoidal fashion in synchronism with the rotation of the rotor. A pole position-detecting device produces a multi-phase sinusoidal pole position-detecting signal representative of the position of the magnetic poles relative to the rotor. A speed control device produces a current amplitude command signal representative of a desired torque of the rotor. A multiplier multiplies the pole-position detecting signal by the current amplitude command signal to produce a multiplication signal.

Abstract: A diphenylamine derivative of the general formula ##STR1## wherein R represents a hydrogen atom or a methyl group, R.sub.1 and R.sub.2, independently from each other, represent a hydrogen atom, a chlorine atom, a bromine atom, or a hydrocarbon radical having 1 to 12 carbon atoms, and A represents ##STR2## and a degradation inhibitor for rubbery polymers comprising the aforesaid diphenylamine derivative as an active ingredient.