Abstract: A reciprocating pump which is capable of detecting abnormalities in the sucking and discharging of fluid, such as the exhaustion of oil or the clogging of oil on the discharge side, by making use of detecting means which is inexpensive and relatively simple in structure and which can be operated without being detrimentally influenced by the bubbles that may be included in the fluid, while making it possible to minimize the noise generated by external vibrations. In this reciprocating pump, where the sucking and discharging of fluid are effected by making use of a reciprocating member, malfunction-detecting means formed of a piezoelectric element is provided for detecting a pressure fluctuation on a discharge side of the pump, and the pressure fluctuation of fluid being delivered from an discharging port is transmitted via a rigid pressure-receiving member to the piezoelectric element.

Abstract: A reciprocating pump includes a chamber, a reciprocating member arranged to induct a fluid into the chamber and discharge the fluid from the chamber to a delivery side of the pump, and a piezoelectric element attached to the pump and arranged to detect pressure fluctuations on the delivery side of the pump so as to sense any abnormality in the inducting and discharging of fluid.

Abstract: A reciprocating pump which is capable of detecting abnormalities in the sucking and discharging of fluid, such as the exhaustion of oil or the clogging of oil on the discharge side, by making use of detecting means which is inexpensive and relatively simple in structure and which can be operated without being detrimentally influenced by the bubbles that may be included in the fluid, while making it possible to minimize the noise generated by external vibrations. In this reciprocating pump, where the sucking and discharging of fluid are effected by making use of a reciprocating member, malfunction-detecting means formed of a piezoelectric element is provided for detecting a pressure fluctuation on a discharge side of the pump, and the pressure fluctuation of fluid being delivered from an discharging port is transmitted via a rigid pressure-receiving member to the piezoelectric element.

Abstract: A reciprocating pump includes a chamber, a reciprocating member arranged to induct a fluid into the chamber and discharge the fluid from the chamber to a delivery side of the pump, and a piezoelectric element attached to the pump and arranged to detect pressure fluctuations on the delivery side of the pump so as to sense any abnormality in the inducting and discharging of fluid.

Abstract: A disk cleaner includes a polishing member which is adapted to be rotated while being engaged with a surface of the disk, thereby to polish the surface of the disk. The polishing member is disposed such that the rotational axis of the polishing member is kept perpendicular to the surface of the disk, thereby to cause the disk to rotate in one direction due to a frictional force between the polishing member and the surface of the disk. The rotational axis of the polishing member is spaced apart from a rotational axis of the disk in the radial direction of the disk, whereby only part of the polishing member engages the surface of the disk.

Abstract: A disk cleaner includes a polishing member which is adapted to be rotated while being engaged with a surface of the disk, thereby to polish the surface of the disk. The polishing member is disposed such that the rotational axis of the polishing member is kept perpendicular to the surface of the disk, thereby to cause the disk to rotate in one direction due to a frictional force between the polishing member and the surface of the disk. The rotational axis of the polishing member is spaced apart from a rotational axis of the disk in the radial direction of the disk, whereby only part of the polishing member engages the surface of the disk.

Abstract: A separate lubricating device for a two-stroke internal combustion engine provided with an air intake system and a controlling device includes an injector for injecting lubricating oil into a passage of the air intake system and a lubricating control device associated with the controlling device. The lubricating control device controls the timing and quantity of injection of the lubricating oil into the engine.

Abstract: A separate lubricating device for an internal combustion engine includes a lubricating oil injection nozzle for injecting a lubricating oil into a passage of an air intake system and an electric deliverer for delivering a lubricating oil from an oil tank to the lubricating oil injection nozzle. The electric deliverer is positioned remotely from the lubricating oil injection nozzle. The electric deliverer may, to special advantage, be housed inside the oil tank.

Abstract: A strapping machine is disclosed which enables a prolonged life of the driving force supplying means for feeding/tightening a band such as an electric motor to be realized, and which enables maintenance operations such as replacement and adjustment of the parts to be carried out with ease, and whose structure can be rendered simple and inexpensive as a whole, and yet which enables energy saving to be realized. The strapping machine comprising a band feeding/tightening means F adapted to conduct feeding, primary tightening, secondary tightening of a band B to be looped around a periphery of an object to be strapped and the like operation; wherein said band feeding/tightening means F is so constructed as to carry out feeding, primary tightening and secondary tightening of the band B by driving a roller 8 by means of a driving means M2 which is capable of being controlled among rotation, reverse rotation and stopped state.

Abstract: A strapping machine is disclosed which is adapted to be capable of constantly attaining a stable secondary tightening force and thereby capable of preventing a band from coming off the object under strapping, which enables a reduced power consumption cost to be realized, and which can be constructed simply and inexpensively as a whole. The strapping machine comprises a feed/backfeed stepping motor M2 as a source of driving force for a mechanism F including a feed/backfeed roller 8 for conducting feed and backfeed of a band B to be looped around a periphery of an object to be strapped and the like operation; the strapping machine being provided with a reverse rotation preventive means 87, S for timely locking rotation of the feed/backfeed roller 8 in the feed direction D.sub.F of the band B while always permitting rotation of the feed/backfeed roller 8 in the backfeed direction D.sub.B of the band B.

Abstract: A strapping machine is disclosed which enables the operation cams such as the press cam, the heater cam, the slide cam and the like as well as the cam driving motor to be miniaturized, and which is capable of diminishing damages on the operation cams to realize prolonged lives of the cams and hence optimally eliminating cumbersome maintenance operations such as replacement of the cams, and yet whose structure can be rendered simple and inexpensive as a whole, and which enables energy saving to be realized. The strapping machine comprises a band feeding/tightening means F for feeding/tightening a band B to be looped around a periphery of an object to be strapped and the like operation; a band leading end treating means K including a mechanism for conducting a procedure which includes holding, pressing, fusing, cutting the band B and the like operation by actions of a plurality of cams 21, 22, 23, 24, 25 and 26; and a cam driving stepping motor M2 for driving said cams 21, 22, 23, 24, 25 and 26.

Abstract: A decompressor for an internal combustion engine including a mounting hole in which a decompression valve for opening and closing a pressure relief bore opening into a combustion chamber within a cylinder of the engine, is disposed, and also including a through-hole which is obliquely and rectilinearly formed through a portion of a wall of the cylinder, and through which an outer open end portion of the mounting hole is able to communicate with a scavenging passage of the engine.

Abstract: An ignition device for starting an internal combustion engine surely, having a starting member arranged on a rotor of a manual starter or a self-starter motor, the starting member being engaged with an actuating member of a piezoelectric element, an output terminal of which is electrically connected to a magneto ignition system.

Abstract: An internal combustion engine apparatus including an internal combustion engine having an ignition system and a centrifugal clutch. The ignition system is capable of being in delayed ignition timing in a range of low engine speeds and being in advanced ignition timing in a range of high engine speeds while quickly changing ignition timing stepwise when the engine speed is at a predetermined level between the low and high engine speed ranges, and the centrifugal clutch is switched between a condition of engagement and a condition of disengagement at an engine speed in the vicinity of the predetermined engine speed. The apparatus retains the advantages of an internal combustion engine having a centrifugal clutch and allows a machine for which the apparatus is used to make effective use of engine output power. The apparatus has improved engine startup characteristic and increased engine stability and is free from engine stall when the centrifugal clutch is not fully engaged.

Abstract: An ignition system of an internal combustion engine including a bypass circuit having a switch capable of being closed to cause a current produced by a counter electromotive force generated by a first generating coil to bypass a thyristor, and a second generating coil located anterior to the first generating coil with respect to the direction of rotation of a rotary member supporting a permanent magnet, to generate an electromotive force under the influences of the permanent magnet to cause the thyristor to turn on.

Abstract: An ignition system for an internal combustion engine including a CDI magnet device having a generating coil for charging an ignition capacitor, and an ignition coil having a primary winding which receives a supply of the electric charge discharged by the ignition capacitor through a thyristor, and a signal generating device constituting a circuit for releasing the electric charge of a second capacitor through leak resistors and supplying a signal to a gate of the thyristor when the voltage of the second capacitor reaches a predetermined level.

Abstract: A chain saw including an electromagnetic pump (4) for feeding lubricant to saw chain operative in response to an engine speed sensor (5) for sensing the rpm of an internal combustion engine and a microcomputer (6) for controlling the operation of the electromagnetic pump (4). The microcomputer (6) stores a plurality of lubricant feeding patterns covering the number of actuations of the electromagnetic pump (4), the actuation frequency and the period of time of each actuation so as to control automatically the feeding of lubricant to the saw chain from the electromagnetic pump (4) in response to the engine speed sensor (5) to effect lubricant feeding in conformity with the sawing condition.

Abstract: A power-driven portable machine such as a chain saw. The machine has a liquid crystal display device incorporated in a detachable cover member of a supporting assembly which is connected with a driving assembly including a prime mover such as internal combustion engine through vibration damping members.

Abstract: An electronic ignition system of the capacitor-discharge type for an internal combustion engine includes a magneto generator having substantially a single generating coil with no center tap, and includes a change-over circuit which changes over the supply of power generated from the generating coil from the capacitor to an auxiliary unit when the capacitor is charged to a given voltage by the half-waves of one polarity of the alternating electromotive force generated in the generating coil. The opposite-polarity half-waves of the alternating electromotive force are supplied to the auxiliary unit even while the capacitor is being charged.

Abstract: A device for preventing radio frequency interference generated by spark plug of internal combustion engines. The device includes a cover member adapted to cover at least a part of the high-voltage portion of the spark plug such as high-tension cord together with the end of the plug connected to the cord. The cover member is made of a highly soft, flexible and electrically conductive rubber material (high molecular compound). The cover member is grounded through a grounding line to the body of the engine. This device is suitable for use in machines having limited space for mounting the radio frequency interference prevention device, such as chain saw having an internal combustion engine.