Abstract: An acceleration sensor includes first and second fixed electrodes on a substrate, and a movable electrode located above the first and second fixed electrodes facing them. The movable electrode is elastically supported on the substrate by a first elastic supporting body and is movable. A mass, which is elastically supported on the substrate by a second elastically supporting body moves in response to an acceleration in a direction perpendicular to the substrate. A linking portion links the movable electrode and the mass at a position spaced from an axis of movement of the movable electrode by a distance. Acceleration is measured based on changes in a first capacitance between the first fixed electrode and the movable electrode and a second capacitance between the second fixed electrode and the movable electrode. Thus, a high impact resistant and highly reliable acceleration sensor is obtained.

Abstract: First and second fixed electrodes provided on a substrate, a movable electrode which is provided above the first and second fixed electrodes facing against them, and is elastically supported on the substrate by a first elastic supporting body and is swingable, a mass which is elastically supported on the substrate by a second elastically supporting body and is movable in response to an acceleration in a direction perpendicular to the substrate, and a linking portion for linking the movable electrode and the mass at a position away from a swing axis of the movable electrode by a predetermined distance are provided. An acceleration is measured based on changes in a first capacitance provided by the first fixed electrode and the movable electrode and a second capacitance provided by the second fixed electrode and the movable electrode. Thus, a high impact resistant and highly reliable acceleration sensor can be obtained.

Abstract: A sensitive angular velocity sensor is provided without increasing an inter-electrode gap for inducing a torsional vibration.

Abstract: A sensitive angular velocity sensor is provided without increasing an inter-electrode gap for inducing a torsional vibration.

Abstract: A pressure switch with improved sealing of an airtight chamber, and improved electrical characteristics reducing chattering, increasing response rate, and minimizing the pressure necessary for activation. The pressure switch includes an upper substrate with a diaphragm readily deformed by an applied stress, a lower substrate overlapped with the upper substrate to form the airtight chamber, a contact electrically switched in response to the deformation of the diaphragm, and a sealing member continuously surrounding the airtight chamber, disposed between the first and second substrate, and hermetically sealing the airtight chamber.

Abstract: A semiconductor accelerometer switch having a fixed portion including a first control electrode and a movable portion including a movable body. By applying a voltage between the first control electrode and an electrode on the movable body, electrostatic attraction holds the movable body in an initial position. The movable body is displaced when acceleration having a magnitude in a direction acts on the switch. The threshold of acceleration to be detected and general-purpose properties of the accelerometer switch are easily adjusted.

Abstract: The object of the present invention is to provide a die-cushion apparatus of a press machine capable of performing a preliminary acceleration imparted to a die-cushion pad following the lowering of a slide with an exact timing and high precision and being improved so as to eliminate a pressure deviation between an actual pressure in a hydraulic cylinder and a preliminarily set aimed value at a portion near a lower dead point of the slide stroke.

Abstract: A controller for a feeder which automatically feeds a work into and out of a press machine in relation to the operation of said press machine. The controller is capable of automatically setting optimum motion curve in accordance with the configurations and sizes of the press die and the work and determining whether any undue operating condition has been set. To this end, the feeder controller has a device for setting the operation start angle value and operation finish angle value in terms of the rotation angle of a crank shaft of the press machine, and computing device for determining a motion curve on the basis of the operation start and finish angle values. The feeder controller also has a device for computing allowable maximum operation stroke number of the press machine and a device for comparing this stroke number with a set stroke number for the purpose of determination as to whether motors are overloaded or not.

Abstract: A method of an unmanned vehicle comprises the steps of placing a certain number of ground marks each of which comprises a plurality of line segments on a passage of the vehicle measuring amount of movement of the vehicle between the adjacent line segments when the vehicle moves across each of the ground marks, and obtaining a relative positional relation between the ground mark and the vehicle with reference to the amount of movement thereof whereby movement of the vehicle is properly guided in accordance with the thus obtained positional relation. In the case of a navigational guiding method typically employed in aircraft or ship, an estimated position of the vehicle is corrected with reference to the aforesaid relative positional relation.

Abstract: A throttle opener comprises a diaphragm apparatus installed between a throttle valve provided within a throttle bore and an air pump for delivering air to an air injection device for controlling the opening of the throttle to enhance the burning of an air-fuel mixture, thereby decreasing the amount of unburned hydrocarbons in the exhaust gas. The diaphragm apparatus includes a diaphragm member movably fixed therein, responsive to the high delivery pressure from the air pump at the beginning of deceleration period of a vehicle to open the throttle valve slightly enough to prevent misfire of the mixture, thus decreasing the amount of unburned hydrocarbons in the exhaust gas.

Abstract: A control device for a vacuum advancer of the type for actuating the vacuum advancer in the directions of advancing and delaying the ignition timing under the control of a discriminating means to evaluate the operating condition of the engine. The vacuum advancer is adapted to be selectively driven in either of said two directions by the difference between a fraction of the vacuum in the inlet tube of the carbureter or the inlet manifold and either the total vacuum in the inlet tube or manifold or the atmospheric pressure by employing only one switch-over valve.