Abstract: A plant cutting and transplanting apparatus comprises a plant cutting/transplantation room accommodating a first culture box in which multiplied plants to be cut are planted, and a second culture box in which nodular pieces made by cutting the plants are transplanted; a cutting device adapted to cut, in one lot, the plants in the first culture box to the form of nodular pieces and configured to allow the nodular pieces to rest on the edges thereof, the cutting device being arranged so as to be moved vertically and transversely above the space where the first and second culture boxes are placed; and a blade device having a blade for shaking down the nodular pieces which rest on the cutter and which have been moved to a position above the second culture box.

Abstract: An impact ripper (2) mounted on the rear portion of a construction machine, such as a bulldozer (1), for digging a hard soil layer is automatically controlled to reduce the operator's fatigue, to improve operability with regard to the posture of the impact ripper during operation of its vibrating mechanism (3), and to prevent breakdown of the impact ripper caused by wasteful striking. A vehicle tractive force and a vehicle speed required by digging resistance applied to a blade end (2a) of the impact ripper (2) are detected and signals obtained from the detections are inputted to a controller (4). When an automatic strike switch is on, an activating signal is outputted from the controller (4) to the vibrating mechanism (3) of the impact ripper (2) regardless of a vehicle body tractive force when a vehicle speed is less than a predetermined value.

Abstract: A hydraulic circuit for a swivel working machine, in which the operation of the working unit is speeded up when the swiveling body and the working unit are simultaneously operated, includes, for this purpose, first and second operating valves (15.sub.1 and 15.sub.2) connecting the delivery conduit of a hydraulic pump (10) to a swiveling hydraulic motor (16.sub.1) and to a working unit cylinder (16.sub.2), and pressure compensating valves (18) provided between the first operating valve (15.sub.1) and the swiveling hydraulic motor (16.sub.1) and between the second operating valve (15.sub.2) and the working unit cylinder (16.sub.2), the load pressure of the swiveling hydraulic motor (16.sub.1) and the load pressure of the working unit cylinder (16.sub.

Abstract: A gas laser apparatus in which a gas medium in a case and a lubricant for bearings supporting a blower for circulating the gas medium are isolated from each other, so that the lubricant can be prevented from mixing into the gas medium while no substantially large resistance is applied to the blower drive. To isolate the gas medium and the lubricant, magnetic fluid shaft seals (10, 11) are used for sealing between the lubricant for the bearings (6) for supporting rotation shafts (3a, 3b) of the blower (3) and the gas medium in the case (1).

Abstract: An automatic tension adjuster for a fan belt which automatically adjusts the tension of a fan belt even at the time of sudden decrease in speed of an associated engine so as to prevent slip, so-called "creak" or the like from occurring between the fan belt and a crank pulley. For this purpose, there is provided an adjusting means (30) for automatically adjusting an amount by which a lever (5) swings in a direction opposite to that in which it has pushed a tension pulley (4) against the fan belt (8) when the rotational speed of the crank pulley (1) suddenly lowers. This adjusting means includes the lever (5), a yoke (10), an adjusting bolt (13), a lock nut (14) and a fixing bracket (20).

Abstract: The present invention discloses a method of controlling torch height in plasma cutting arranged to monitor the cutting speed so that the optimum torch height is maintained and an excellent cutting quality is obtained even if the cutting speed changes. To this end, a base metal (2) is cut by a plasma arc (3) while a torch (1) is maintained at an optimum height (hc) from the base metal (2), and arc voltage (Vi) is read several times (i=1 to n) after the arc voltage becomes steady, their mean arc voltage (Vb) is calculated, a cutting speed (Fa) is read at the time of steady cutting, the means arc voltage (Vb) is corrected by this cutting speed (Fa) to obtain a target arc voltage (Vc) and the optimum height (hc) is maintained by this target arc voltage (Vc).

Abstract: In the present invention, an EL element section (1) includes a plurality of arranged cells, each including a thin film EL element formed so as to emit white light, and a like number of predetermined-color filters (2) formed on the surface of the EL element section and corresponding to the cells such that each cell is caused to emit light in accordance with image information and the emitted light is output through the corresponding color filter to color display purposes. Thus, a very thin color display apparatus is provided in which contrast is good and the dependency of the luminance on the visual sensation is also good. The thin film EL element according to the present invention uses a luminous layer of zinc sulphide containing nitrogen, so that transitional luminescence occurs among a plurality of levels, and hence rays of light having various wavelengths are emitted to thereby provide white light containing three primary colors.

Abstract: A positive characteristic thermistor, in which the outer periphery of a first electrode including a metal other than silver as its main component is positioned on the inside of the outer periphery of the main body of this thermistor, and is made to coincide with the outer periphery of a second electrode which includes silver as its main component and formed on the first electrode or to be placed on the inside of the periphery of the second electrode.

Abstract: In a hydraulic drilling machine with a boom, arm and bucket as working parts, one or more of the working parts can be vibrated automatically to perform effective drilling with reduced resistance in various types of operations when the soil changes. Adequate vibration can be automatically generated by setting the working mode (Bo, A, Bu, Sk) and vibration mode (L, M, S) according to the soil or operation form beforehand and by setting the automatic vibration mode. Furthermore, since the control input of the working part lever can be added to the automatic vibration, simple and minute repeated operations, such as pressure-shifting, sifting or drilling conducted while the bucket is vibrated, can be performed readily and uniformly without exhausting the operator, and workability can thus be greatly improved.

Abstract: When a lever (48) is rocked either rightwardly or leftwardly while the lever (48) is rocked forwardly and the vehicle is moving forwardly, the vehicle is steered in the direction in which lever (48) is rocked. When the lever (48) is rocked either rightwardly or leftwardly while the lever (48) is rocked backwardly and the vehicle is moving backwardly, the vehicle is steered in the direction in which lever (48) is rocked. For the above operation, a valve body (44) comprising a pilot valve (420) and a change valve (421) is coupled to the lever (48). The lever (48) is rocked rightwardly or leftwardly, and pressure oil supplied through the pilot valve (420) actuates a rotary direction changing valve (25). When the lever (48) is rocked backwardly, the change valve (421) switches the direction in which the pressure oil is supplied through the pilot valve (420) to the reverse direction.

Abstract: This invention relates to a method and apparatus for controlling shoe slip of a crawler vehicle directed to automatically prevent an endless track from slipping beyond the state where maximum pulling force is attained thereby liberating an operator from troublesome operations requiring a high level of skill. The shoe slip control method is accomplished by switching the operation mode to a predetermined engine output mode when a shoe slip ratio exceeds a predetermined value during the operation of the vehicle.

Abstract: A device for fastening an ajar door of the operator's cab of a construction machine, which is small in size, presents a good appearance, and is easy to unfasten, has a plate support element (5) fixed to the outer surface of the operator's cab (2), a tubular support element (6) to hold the plate support element, a U-shaped striker (10) fixed to the plate support element, a lock (20) for holding the striker when the door is ajar, and a releasing lever (30) for releasing the lock from inside the operator's cab.

Abstract: It is an object to provide a bending angle detecting system for a press brake which can perform high precision bending process without employing a special die, The bending angle detecting system includes a sensor (20) provided on a back stop (8) for determining a bending position of a workpiece (7) to be subject to the bending process, and means for controlling a lower limit position of a punch (6) based on an angle signal detected by the sensor (20).

Abstract: An optical connector assembly (1) for connecting an optical fiber (9), an optical element (4) (light-emitting element or light-receiving element), and an electric 5 circuit together. A bolt (32) of an optical fiber-mounting fitting in which the optical fiber (9) is inserted in the hole of an electric seal (32) and a bolt (31), is screwed into a threaded hole formed in a housing (2) of the plug (1) that accommodates the optical element (4) in order to couple the optical fiber (9) to the plug (1). The connection between the optical element (4) and the electric circuit is accomplished by a jack (20) and the plug (1) is provided with a lock mechanism based on a push-type lever (20), featuring improved sealing performance against water, oil, dust and dirt.

Abstract: An automatic purging method for an injection molding machine which is capable of injecting an arbitrary material among different kinds of materials into a mold without requiring a resin replacing block or a purging container and an additional material supply means for increasing the material supply pressure, and which has a nozzle valve in a nozzle unit. This method is used so as to enable the automatic purging to be done smoothly and speedily by operating the nozzle valve so that it behaves according to a predetermined program. This automatic purging method consists of the steps of supplying a fresh material from a hopper (7) into a screw cylinder (1), rotating a screw with a nozzle valve (4) closed, for a predetermined period of time or until the screw has been moved back a preset stroke, to plasticize the resin, and then purging the molten resin with the nozzle valve (4) set to a predetermined degree of opening.

Abstract: This invention aims at providing a hydraulic circuit apparatus for supplying pressurized fluid into cylinders for a work implement arranged such that during normal operation of the work implement the flow rate of fluid discharged by a pump is controlled such that the difference between the discharge pressure of the pump and the load pressure is always kept constant, whilst during inching operation of the work implement the flow rate of fluid discharged by the pump is reduced.

Abstract: In a measuring differential amplifier having first and second input terminals for subtracting a first signal applied to the first input terminal from a second signal applied to the second input terminal to obtain a subtraction and for outputting a signal corresponding to A times of the subtraction, a circuit for reducing an offset generated during measurement. Prior to the measurement, the second signal is applied to the first and second input terminals so that the differential amplifier outputs a voltage corresponding to A times of a difference between the second signals, i.e., A times an offset voltage. At this time, the differential amplifier is connected at its output terminal to one end of a capacitor grounded at the other end so that the voltage corresponding to A times of the offset voltage is applied to the capacitor for charging.

Abstract: A teaching and playback method for a work machine that is applicable to construction equipment such as a hydraulic excavator to automatize operation. Data on the operator's operation of work machine actuators is stored, and the stored data is reproduced so that the same operation as that by the operator is automatically performed. The method is adapted to effect exactly the same operation as what has been taught even when, during playback, the load on the actuators has varied from the level applied during the teaching. For this purpose, the pump discharge amount and the amounts of flow supplied to the actuators which are present during the teaching are stored. During playback, when the load has varied, and the pump discharge has changed, the engine output is controlled in such a manner that the actual pump discharge becomes equal to the amount stored during the teaching.

Abstract: In the hydraulic apparatus (1) according to a first aspect of the present invention, mid-pressures between the inlet side and outlet side pressures of a first and a second pressure compensating valves (4, 4') are permitted to act on the flow rate decreasing side pressure receiving surfaces (4b, 4b') thereof through first and second mid-pressure supplying means (13, 13'), thereby restraining operational error and malfunction of the pressure compensating valves (4, 4'). In the hydraulic apparatus (20) according to a second aspect of the present invention. when actuating valves are made to assume neutral position, holding pressures of hydraulic actuators (5, 5') are permitted to act on flow rate decreasing side pressure receiving surfaces (4b, 4b') of pressure compensating valves (4), (4') so that spools of the pressure compensating valves are held at compensating position, thereby improving the response of the hydraulic actuators (5, 5') to lever actuation.

Abstract: An apparatus for controlling a press brake is advantageously employable for a press brake for which a high operational efficiency and a high working accuracy are required. In response to inputting of working conditions inclusive of a target bending angle for a plate, the apparatus calculates displacement of a load active on a stationary table and a movable table, automatically calculates a quantity of crowning to be adjusted based on results derived from the foregoing calculation and then calculates the present position assumed by the movable in additional consideration of the quantity of crowning to be adjusted, based on results derived from the aforementioned calculations. The press brake accurately bends the plate based on the thus derived quantity of crowing to be adjusted and the present position assumed by the movable table without an occurrence of malfunction of so-called intermediate opening of the bent plate.