Abstract: A ladder circuit editing system inputs and edits a sequence program for a program controller in the form of a ladder diagram. The ladder circuit editing system has an unavailable area storing at least one inputted circuit pattern and an available area storing a new circuit pattern, and successively inputs circuit patterns from the available area. The ladder circuit editing system includes a circuit pattern extracting means, a display means, and a copying means. The circuit pattern extracting means compares a circuit element from a circuit pattern stored in the available area with a circuit element from a circuit pattern already stored in the unavailable area, and extracts a circuit pattern containing a circuit element that agrees with a stored one. The display means displays the extracted circuit pattern on an input screen. The copying means copies the extracted circuit pattern into the available area according to an operator's entry.

Abstract: A sequence controller with error correction and a sequence controlling method are disclosed. The sequence controller is provided with a stop-time operation execution table, which stores stop-time execution step numbers and resumption-time execution step numbers. These step numbers correspond to step numbers at which a stop is expected to occur in a sequence control program for sequence-controlling a controlled object. According to the sequence controlling method, the execution of the sequence control program is stopped at the occurrence of an error, the stop-time execution step number corresponding to the stop-time step number is read from the stop-time operation execution table, a step having the step number read is executed, the resumption-time execution step number is read, and the execution is resumed from that step.

Abstract: An electrophotographic photoreceptor is disclosed, comprising at least a substrate having thereon a charge transporting layer and a charge generating layer, wherein the charge transporting layer is a porous anodized aluminum film which is formed by anodizing a substrate at least a surface of which comprises aluminum or an aluminum alloy, with a conductive substance formed from an oxyacid salt of a transition metal being deposited to the inner wall of the pores thereof. The photoreceptor is excellent in physical properties, electrophotographic characteristics, and adhesion between the charge transporting layer and charge generating layer.

Abstract: A programmable controller (PC) controlling the operation of a machine is described that executes a program written in a sequential function chart (SFC) language. The PC can generate a reverse operation sequence chart from an ordinary operation SFC program sequence chart. This allows the PC to control the machine in the reverse direction. Thus, if a machine experiences a failure, the reverse operation sequence chart is used and reverse operations are performed to allow the cause of the failure to be removed. The ordinary operation can resume without having to restart the sequence from the beginning.

Abstract: An electrophotographic photoreceptor is disclosed, comprising a support having thereon a light reflection preventive layer comprising a porous anodized film and a photosensitive layer in this order, in which a metal is filled in the pores of the porous anodized film. The anodized film prevents appearance of an interference band when the photoreceptor is applied to a laser beam printer.

Abstract: An electrophotographic photoreceptor is disclosed, comprising at least a substrate having thereon a charge transporting layer and a charge generating layer, wherein said charge transporting layer is a porous anodized aluminum film which is formed by anodizing a substrate at least a surface of which comprises aluminum or an aluminum alloy by using an alternating current having an effective voltage of from 3 to 40 V or an electrical current of alternating waveform having substantially the equal action.

Abstract: An electrophotographic photoreceptor is disclosed, comprising at least a substrate having thereon a charge transporting layer and a charge generating layer, wherein the charge transporting layer is a porous anodized film which is formed by anodizing a substrate comprising an Al-Mg alloy containing from 2.2 to 5.6% by weight of magnesium and, as impurities, at least one of Mn, Cu, Fe, Si, Cr, and Zn or an Al-Mn alloy containing from 1.0 to 1.5% by weight of manganese and, as impurities, at least one of Cu, Fe, Si, and Zn. And the electrophotographic photoreceptor can be produced by a process comprising subjecting a substrate comprising an Al-Mg alloy containing from 2.2 to 5.6% by weight of magnesium and, as impurities, at least one of Mn, Cu, Fe, Si, Cr, and Zn or an Al-Mn alloy containing from 1.0 to 1.

Abstract: A ringing choke converter power supply device comprising a ringing choke converter power supply for stabilizing an output voltage by an indirect feedback system; a variable impedance element provided on a primary or secondary side of the power supply; and a control circuit for transmitting a control signal to the variable impedance element in such a direction that an error signal obtained by comparing the output voltage of the power supply with a predetermined reference voltage becomes zero. The variable impedance element, which is preferably a saturable reactor, is interposed between a voltage detection winding and a feedback diode or between the feedback diode and a capacitor when the element is provided on the primary side; and is interposed between a transformer secondary winding and a rectifier circuit, when the element is provided on the secondary side.