Hitachi Koki Co., Ltd.

Koji Unno

Satoshi Numata

Hiroyuki Takahashi

Junichi Suzuki

Nobuharu Kido

Centrifuge

A centrifugal apparatus is disclosed which includes a rotor, a motor, a speed signal generator, including a disc having alternate reflective and non-reflective stripes, for generating a rotating speed signal of the rotor, a microprocessor (mpu), an analog processing circuit. The rotating speed of the rotor is judged by both the microprocessor and the analog processing circuit including a F/V converter and a voltage comparator independently, so that an overspeed condition is prevented. The mpu may further detect a motor rotating speed and compare the variation in the rotating speed signal of the rotor and the rotating speed of the motor. If the difference exceeds a reference, the mpu stops the rotor. Another disc of which reflective strip is replaced by a non reflective strip may be provided to the rotor and a pulse compensation circuit for compensating the lack of the pulse in the rotating speed signal is also provided. This type of the disc is provided to distinguish the types of these rotors. The pulse compensation circuit detects the lack of the pulse and then, generates and adds a pulse to the rotating speed signal.

Centrifugal apparatus with protection

A processor (9) within an apparatus for managing a centrifuge by operation results (8) identifies an ID card of a user who operates a centrifuge (1) through a card reader (12). Further, a rotation signal (7) that will serve as operation result data of the centrifuge is received through a counter (10), and a rotation start time and a rotation stop time of a drive section (3) are read by a real-time clock. Still further, the processor (9) calculates the operation result data, displays the calculated data on a display section (16), stores the operation result data in a memory (15), and outputs the operation result data to a printer (13) as may be required by the user.

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Hitachinaka, Japan

Koji Unno