Abstract: By a controller 18 which receives signal input from a first sensor 16 for detecting the vibratory state of an object O to be isolated from vibration and from a second sensor 17 for detecting the vibratory state of an intermediate mass element 13, a signal is outputted to a power input portion 12 of a piezoelectric element 11 to cause a voltage variation such that the intermediate mass element 13 vibrates to cancel out the vibrations of the object O in an acting direction.

Abstract: A chuck mechanism (2) for holding a pipette head (3) is attached to an output end of a reciprocating drive mechanism (1). A chuck control mechanism (5) for controlling the head holding and releasing operations of the chuck mechanism (2) is disposed at one side of each of head support members (41) of a head stowing device (4) for accommodating replaceable pipette heads (3). The chuck control mechanism (5) comprises a control piece (54) engageable with and disengageable from the chuck mechanism (2) for effecting the holding and releasing operations, and a plurality of magnets (81), (82), (8) for reciprocatingly driving the control piece (54) with the reciprocating movement of the chuck mechanism (2) when the pipette head (3) as held by the chuck mechanism (2) is thereby moved toward or away from the head support member (41). The pipetting apparatus is adapted to automatically and rapidly replace the pipette head by another.

Abstract: An ultrasonic sensor detects the time of rise of the first of transmitted waves and also detects peak points Po appearing in the waveform of received waves to detect a waveform reference point where the time-base coordinate of a phantom envelope connecting these peak points Po is a minimum. The time T2 of rise of the first of the received waves is calculated by adding a predetermined period of offset time To to the time t2 of the waveform reference point of the received waves to calculate the elapsed time .DELTA.T from the time of rise of the first transmitted wave to the time of rise of the first received wave. The distance L to an object of measurement is calculated based on the result of calculation. The distance L to the object can be calculated alternatively based on the elapsed time .DELTA.T' from a waveform reference point of the transmitted waves to the waveform reference point of the received waves.

Abstract: A failure diagnosing system for an absorption chiller including an evaporator, absorber, etc. comprises a plurality of sensors for measuring at least one representative temperatures of each of two fluids participating in heat exchange in a specified heat exchange unit, and an arithmetic unit for receiving measurement data from the sensors. The arithmetic unit comprises a circuit for calculating an actual temperature difference using a simple calculation equation defined by a linear expression, a circuit for calculating the amount of heat exchange by the absorber, and a circuit for calculating the degree of abnormality of the absorber by comparing the actual temperature difference with an ideal temperature difference for the same amount of heat exchange as the calculated amount.

Abstract: A control system for absorption chillers which comprises a device for measuring operating state data concerning components of the main assembly of the chiller and including the liquid level of a high temperature generator and the degree of opening of a gas valve, and a fuzzy control circuit for calculating the deviation of the liquid level from a target value based on the measured operating state data, predicting a variation in the liquid level from the deviation and another item of the operating state data and calculating a control input as to the inverter frequency of an absorbent pump based on the result of prediction, whereby even when a great disturbance occurs, the liquid level of the generator can be controlled with high responsiveness to minimize the variation of the liquid level.

Abstract: A dynamic absorber for a pendulum type structure is particularly useful for suppressing swing. In operative association with the pendulum type structure, the dynamic absorber is provided above the center of gravity of the pendulum type structure such that the dynamic absorber can apply damping force to the pendulum type structure.

Abstract: An active control precision damping table supported by air springs. Level displacement and vibrations of the table are detected by a sensor or sensors, and sensor outputs are fed to a variation adder which carries out an adding operation on one of the sensor outputs and an inversion signal produced by inverting the other sensor output 180 degrees. The adder outputs results of the operation to a drive circuit, which in turn outputs a drive signal to a control valve. The control valve is operable in response to the drive signal to adjust air pressure in pressure vessels of the air springs.

Abstract: An active control precision damping table supported by air springs. Level displacement and vibrations of the table are detected by a sensor or sensors, and sensor outputs are fed to a variation adder which carries out an adding operation on one of the sensor outputs and an inversion signal produced by inverting the other sensor output 180 degrees. The adder outputs results of the operation to a drive circuit, which in turn outputs a drive signal to a control valve. The control valve is operable in response to the drive signal to adjust air pressure in pressure vessels of the air springs.

Abstract: The transfer and conveying apparatus of the invention transfers a toner image from a photoreceptor onto a recording paper by performing corona discharge at a location opposite to the photoreceptor and adjacent to a portion of a conveying belt which contacts the one of a pair of rollers about which the conveying belt is trained that is closest to the photoreceptor, and conveys the recording paper after transfer of the image by attracting the paper to the belt. This belt is brought into contact with a conductive brush which has AC voltage or DC voltage applied thereto with polarity opposite that applied for transfer of the image to thereby prevent the toner from depositing on the belt. Furthermore, the lower stretched portion of the belt may be wound about the roller through predetermined angular range with the recording paper disposed between the belt and the photoreceptor.

Abstract: A method of controlling level lateral positions of a vibration control base suspended by air springs to be returned to its standard level and lateral positions and to keep their positions by utilizing analog integration or a feedback compensation in combination thereto so as to control an air pressure or air pressures of air springs for driving the vibration control base and also controlling vertical and horizontal vibrations of the vibration control base and an apparatus for carrying out the said method.

Abstract: An active control precision damping table supported by air springs. Level displacement and vibrations of the table are detected by a sensor or sensors, and sensor outputs are fed to a variation adder which carries out an adding operation on one of the sensor outputs and an inversion signal produced by inverting the other sensor output 180 degrees. The adder outputs results of the operation to a drive circuit, which in turn outputs a drive signal to a control valve. The control valve is operable in response to the drive signal to adjust air pressure in pressure vessels of the air springs.

Abstract: A damping support structure for preventing vibrations of an apparatus table supporting an apparatus for manufacturing ultra-high precision devices such as semiconductors and printed circuit boards. The apparatus table is supported in suspension by support members, with its apparatus mounting surface disposed at a low level. The support members are supported by stationary members through vertically extendible and contractible first air springs. Horizontally extendible and contractible second air springs are disposed between the stationary members and the apparatus table. The first and second air springs serve to mitigate vertical and horizontal vibrations of the apparatus table, respectively.

Abstract: In an apparatus for conveying dielectric sheets used in copying machines, etc., sheets are held by electrostatic adhesion on the surface of a conveyor when such surface is electrically charged and thus conveyed by the conveyor, wherein a dielectric layer consisting of a dielectric material and electrode parts consisting of a conductive material, which are electrically connected to portions of the dielectric layer and grounded, are provided adjacent to each other on an adhesion surface of the conveyor.