Abstract: During shift change, a discrimination is made as to a load, a quantity of residual hydraulic oil in respective shift change clutches (F, R, 1 to 4) and a state of shift change which has been effected from what speed stage to what speed stage so that a pattern of electrical commands to be issued to pressure control valves for required shift change clutches is variably controlled depending on results derived from the above discrimination. Thus, smooth shift change can always be achieved regardless of running conditions. Electrical commands to be fed to the respective pressure control valves are compared with electrical currents outputted from drive circuits and outputs from clutch pressure detecting means for each clutch, whereby an abnormality is detected with the relevant clutch based on results derived from the comparison. Once an abnormality is detected, an adequate disposal for processing the abnormality is executed so as to reliably prevent double engagement from taking place with clutches.

Abstract: An automatic transmission for a hydraulic excavator or the like has an auxiliary speed change gear, capable of changing between high and low speeds, and an automatic change-over valve in a hydraulic circuit which connects the high and low speed clutches and a clutch operating hydraulic pump. One end of the automatic change-over valve is connected to the discharge side of the pump by a conduit containing an automatic speed changing valve. A rotation sensing hydraulic source is coupled to a shaft of the auxiliary speed change gear. A hydraulic circuit connects the discharge side of the rotation sensing hydraulic source to one end of the automatic speed changing valve. The automatic speed changing valve changes over the clutches automatically, without damaging the hydraulic motor driving the clutches.

Abstract: The present invention is applicable to a shield tunneling method and a tunneling machine therefor which excavate a deformed section by rotating a plurality of circular cutters. There is provided a deformed shield tunneling method and a tunneling machine therefor which excavate a tunnel surface by rotating a plurality of circular cutters (4), (5) and (6) arranged in the front of a front casing (2) of a tunneling machine (1) and which cut soil in tangent portions (15a), (15b) and (15c) of circles formed between said circular cutters by rocking rocking cutters (17) attached opposite to the tangent portions in order to continue excavation while completely forming a predetermined deformed section in excavation of any combination of circular cutters regardless of the diameter of the circular cutters.

Abstract: A combined hydraulic motor and speed reducer intended to improve the service life of sealing members and bearings by cooling lubricating oil within a speed reducer case. The hydraulic motor includes a motor case (1) having a peripheral surface in which a pair of supply/discharge ports (18, 17) are formed in a diametrically opposite relationship and extend axially from one end of the motor case (1) so as to open to a speed reducer case (6). Cool lubricating oil is supplied to the interior of the speed reducer case, and at the same time, high temperature lubricating oil is discharged out of the motor. In this way, the lubricating oil within the speed reducer case is maintained at low temperature.

Abstract: The temperatures of structural members of a plastic compression molding machine are controlled so that the socket-and-spigot gap between the dies is maintained at a constant size or so that changes in the socket-and-spigot gap between the dies is maintained below an allowable limit. Working oil for the lift cylinder is passed through passages in at least the bolster, the slide, and the frame. A temperature controller can include heat exchangers and/or flow-rate control valves to control the temperature and/or flow rate of the portion of the working oil to be circulated through the respective structural member.

Abstract: An apparatus for detecting a position of an underground excavator in tunneling the earth measures automatically: a three-dimensional position of the excavator relative to a predetermined reference position, or three-dimensional positions of a pair of underground excavators relative to each other. The excavators are disposed in opposite ends of a tunnel to be dug, and dig the tunnel toward each other.

Abstract: A piezoelectric actuator capable of producing a linear displacement is used for the control of deflection angle of a scanning deflection mirror. To convert the linear displacement produced by the piezoelectric actuator into rotational displacement, a lever contacting the piezoelectric actuator is attached to the rotary shaft of the mirror and is urged by a spring in the direction counter to the direction of rotation caused by the piezoelectric actuator. An amplifying mechanism amplifies a small displacement produced by the piezoelectric actuator into a large rotational displacement proportional to the linear displacement produced by the piezoelectric actuator, thereby imparting a desired deflection angle to the deflection mirror. A mechanism for detecting rotational displacement is associated with the input or the output shaft of the amplifying mechanism to feedback any positional offset.

Abstract: When a press or like machine is centrally controlled, many sensors are used for detecting the conditions of various portions of the machine and many actuators are used for controlling the conditions of various portions of the machine. The invention provides a device for detecting the position of broken line in a series controller wherein peripheral processing devices indirectly control the sensors and the actuators, and these peripheral processing devices are connected in series via signal lines in an annular manner via a central processing unit or in a serial manner relative to the central processing unit, such that position of breakage on the signal line can be detected. Therefore, when breakage develops on the signal line and no signal is transmitted to the peripheral processing device directly after the broken line, the peripheral processing device produces a line breakage signal.

Abstract: A method of controlling a speed changing operation wherein the method is preferably employable for a caterpillar drive type construction machine including a direct transmission is disclosed. When a shift-up speed changing operation is to be performed, the method is practiced by way of the steps, i.e.

Abstract: This apparatus for carrying out serial control comprises a plurality of node controllers each including a group of sensors (21S to 2nS), a group of actuators (21A to 2nA) or the like terminal components and a main controller for controlling the node controllers and the terminal components in an annular configuration or in a daisychain-shaped configuration. The main controller sends a frame signal which includes a first identification code (STI) indicative of the head position of sensor data and a second identification code (STO) indicative of the head position of actuator controlling data in one frame. Each node controller including a group of sensors feeds its own sensor data to a location just behind the first identification code of the received frame signal and sends to the subsequent stage the frame signal delayed by a length of the sensor data having the received frame signal fed thereto, subsequent to the signal having the sensor data fed thereto.

Abstract: A direct driven shock ripper device according to the present invention is capable of efficiently transferring blows of a hydraulic breaker (10) to a base rock. It includes a bracket (2) which can be affixed to the rear end of a construction machine vehicle, a beam (4) on which a shank (8) and a breaker mount bracket (9) supporting the hydraulic breaker (10) are mounted, the beam (4) being disposed to the rear of the bracket (2), an arm (6) which couples a lower portion of the bracket (2) to a lower portion of the beam (4), a tilt cylinder (5) which couples an upper portion of the bracket (2) to an upper portion of the beam (4), and a lift cylinder (16) which couples an upper portion of the bracket (2) to a lower portion of the beam (4). A pair of link members (7) are provided between the beam (4) and the shank (8) to pivotally support the shank (8) on the beam (4) and thereby form a quadric linkage.

Abstract: The present invention is concerned with a transmission constructed in the two-staged structure including main speed changing units (1st, 2nd) and auxiliary speed changing units (H, L) which are provided with clutches (H, L, 1st, 2nd) which in turn are individually connected to electronic type pressure control valves (21 to 24) so as to enable the respective clutches to be controlled separately. When it is found that pressurized hydraulic oil delivered from a hydraulic pump has a shortage in amount at the time of starting of forward movement of a vehicle, feeding of hydraulic oil to the clutches (H, L) on the main speed changing unit side and the clutches (1st, 2nd) on the auxiliary speed changing unit side is effected with a certain time difference kept therebetween in order to suppress fluctuation in filling time due to reduction of an amount of hydraulic oil delivered from the hydraulic pump.

Abstract: There is disclosed an apparatus which controls a variable delivery motor installed on a hydraulically operated vehicle in such a way that the maximum vehicle speed can be continuously varied without sacrificing the performance of the nonstep variable speed, hydraulically operated vehicle. The apparatus includes a hydraulic pump (1) connected with the variable delivery hydraulic motor (2) by main circuits (24, 25), a cylinder (31) that controls the motor (2), a control pump (3) delivering pilot pressure, and a vehicle speed limiter (122). Higher pressure is produced inside the main circuits. The limiter limits the minimum capacity of the motor (2), depending on the higher pressure and also on the pilot pressure acting on the cylinder (31).

Abstract: A loading/unloading vehicle having booms and a bucket carried thereon such as a shovel loader, a wheel loader or the like vehicle detects that a true bucket-to-ground angle coincides with a preset angle after the vehicle starts automatic turning movement of the bucket. When the coincidence is detected, the automatic turning movement of the bucket is interrupted. Thereafter, a differential value between the true bucket-to-ground angle and the preset angle is determined, if any and then the bucket angle is corrected so as to allow the differential value to be reduced to zero. Consequently, the bucket is held at the preset angle after the bucket stops, even though the booms continue to be turned.

Abstract: An apparatus for controlling an output from an excimer laser device wherein at least two etalons each having a large diameter are arranged between a rear mirror and a laser chamber for the excimer laser device is disclosed. With the apparatus, the operative range of laser light outputted from the excimer laser device can be narrowed by executing superposition control for a wavelength of laser light which transmits through each etalon, while maintaining the number of spatial lateral modes. The apparatus is preferably employable as a light source particularly for a unit for projecting and exposing figures in a reduced size. Superposition control with the use of a superposition control unit, excitation intensity control for laser gas with the use of an excitation intensity control unit and partial gas replacement control for laser gas with the use of a gas control unit are executed in a predetermined timing relationship, respectively.

Abstract: A system wherein raw material excavated from a plurality of pit faces on a mine are conveyed to and collected at a specific collecting location at the foot of a mountain by a plurality of vehicles and the degree of quality of collected raw material is then properly controlled at the specific collecting location is generally called a mining site control process. To practically execute such a mining control process, the degree of quality of conveyed raw material previously analyzed per each pit face and a quantity of conveyance thereof are confirmed at every time when the raw material is conveyed to the collecting location.

Abstract: An apparatus for controlling a power shovel or like construction machine which assures that various control modes for performing certain operations can reliably be selected by merely activating a switch corresponding to the operation to be performed. When a certain operation is selected, a CPU and an operation panel inputs a signal indicative of the selected operation into a pump controller. The pump controller outputs a signal indicative of the magnitude of the target engine revolution number and a magnitude of composite suction torque of the pumps adapted to the selected operation to an electric governor controller and a TVC valve. In response to this signal, the governor controller controls a governor and swash plates of the pumps such that the target engine revolution number is reached and the output torque from the engine matches the composite suction torque of the pumps.

Abstract: A poppet valve device according to the present invention is adapted to sequentially operate a plurality of poppet valves the switching operation of a pilot valve, for example, an electromagnetic solenoid or the like which operates in response to an external input signal. The above-mentioned poppet valve device includes first and second poppet valves (A, B) each of which is constructed so that a poppet (32) for communicating or intercepting an inlet port (30) and an outlet port (31) with or from each other may be moved towards a communicating position by an inlet port side pressure acting upon its pressure receiving portion (32a). The poppet (32) may be moved towards an intercepting position by a pressure acting upon its back pressure chamber (38a, 38b).

Abstract: An improved anti abnormal-pressure/vacuum valve has a sleeve-like valve provided with a projection at its front end projecting into an actuator-side port, and a pressure introducing tube in a spool valve slidable in the sleeve-like valve for introducing oil pressure into a valve pressing chamber at the rear of the sleeve-like valve has its front-end portion disposed inside a front-end surface of the spool valve. This converts a dynamically varying pressure in the actuator-side port into a statically varying pressure in the valve pressing chamber so as to prevent the sleeve-like valve from being accidentally separated from its valve seat when oil pressure in the actuator-side port varies dynamically.

Abstract: A partition type radiation local air conditioning unit is used in the field of air conditioning equipment and of office furniture. The unit is intended to make it possible to provide a better feeling of coolness by combining radiation cooling with convection cooling and to diminish the size of the air conditioning unit, which is in the form of a partition unit (1). This partition unit (1) includes a crossflow fan (4h) for blowing out breeze, an air inlet (4ha), and a breeze outlet (4hb), which are so arranged that the breeze (41) from the breeze outlet (4hb) is blown against the face of a person sitting in front of the unit. A baffle plate (9) can be provided in the air passage (7) between the crossflow fan (3) for heat-dissipating-air blowing and the radiation fins (2b) of thermoelectric elements (2a), the baffle plate (9) dividing this air passage (7) into a heat-dissipating-air passage (71) and a breeze air passage (72).