Abstract: A filter apparatus for filtering a liquid containing solid materials comprises a filter member made of a flexible sheet having a number of through holes which prevent passage of solid materials while allow passage of the liquid thereby filtering the liquid, first wipers which are slidably arranged over the surface of the filter member at the liquid inlet side and which scrape off the solid materials deposited on the surface of the filter member upon sliding movement thereof; second wipers which are slidably arranged over the surface of the filter member at the liquid outlet side; and driving mechanism for sliding the first and second wipers on the surfaces of the filter member at the same speed in the same direction so that the first and second wipers oppose each other with the filter member disposed therebetween.

Abstract: A magnetic belt conveyor type magnetic particle separator comprises a storage tank for storing cutting oil containing magnetic particles, an endless belt conveyor extending sidewise from the storage tank in an upwardly inclined direction, and a magnet disposed beneath the forward run of the belt conveyor to extend in the direction of running thereof. Magnetic particles contained in the cutting oil are attracted by the forces of the magnet to the upper surface of the forward run of the belt conveyor to be conveyed up to the forward run end thereof and separated therefrom at the forward run end for being discharged.

Abstract: A voltage stabilizing device for a magneto alternating current generator for stabilizing and maintaining the alternating current output voltage at an effective value less than a certain predetermined level includes means for detecting the rising of the alternating current output voltage to a given reference voltage after rectification of the alternating output voltage of the magneto alternating current generator and means for phase controlling a controlled rectifier having a control electrode as a function of the difference between the raised output voltage and the reference voltage. The controlled rectifier is coupled across the output of the magneto alternating current generator.

Abstract: A constant voltage device for a magneto alternating current generator comprises a silicon controlled rectifier and a trigger signal generator circuit which comprises a voltage divider, a constant voltage element connected between the voltage divider and a gate of the silicon controlled rectifier and further a capacitor for forming a series-parallel delay circuit together with the voltage divider and for phase controlling the silicon controlled rectifier.