Liquid transfer apparatus and control method therefor
First Claim
1. A liquid transfer apparatus comprising:
- a rod connected to a syringe tip in a syringe moved in two mutually opposite directions to draw liquid into the syringe and discharge the liquid therefrom;
a motor for moving the rod;
a motor drive controller for supplying motor drive pulses to the motor to drive the motor and to stop the motor based on a stop signal supplied thereto;
a motor drive pulse generating unit connected to the motor for obtaining motor drive pulses; and
a desynchronization detector for detecting a desynchronization of the motor by comparing the motor drive pulses obtained by the motor drive pulse generating unit with the motor drive pulses supplied by the motor drive controller.
1 Assignment
0 Petitions
Accused Products
Abstract
A residual liquid quantity in a syringe is reduced to the minimum. There are detected with high precision malfunctions due to chokes in pipes and incomplete switchings of an electromagnetic valve and a broken valve without a contamination problem produced. When a syringe pump is powered on, a motor is driven at low speed so that liquid in a syringe is discharged completely. When a desynchronization of the motor is detected by comparing motor driving pulses obtained by a rotary encoder with motor driving pulses supplied to the motor, a stop signal is supplied to a motor driver and the position of a rod is memorized as the origin of the syringe pump in an origin sensor. While the syringe pump is in a normal operating state, the position of the rod is detected to be at the origin to supply a stop signal to the motor driver.
7 Citations
10 Claims
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1. A liquid transfer apparatus comprising:
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a rod connected to a syringe tip in a syringe moved in two mutually opposite directions to draw liquid into the syringe and discharge the liquid therefrom;
a motor for moving the rod;
a motor drive controller for supplying motor drive pulses to the motor to drive the motor and to stop the motor based on a stop signal supplied thereto;
a motor drive pulse generating unit connected to the motor for obtaining motor drive pulses; and
a desynchronization detector for detecting a desynchronization of the motor by comparing the motor drive pulses obtained by the motor drive pulse generating unit with the motor drive pulses supplied by the motor drive controller. - View Dependent Claims (2, 3)
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4. A control method for a liquid transfer apparatus comprising:
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step for supplying motor drive pulses to a motor for moving in two mutually opposite directions a rod connected to a syringe tip in a syringe to draw liquid into the syringe and discharge the liquid therefrom;
step for obtaining motor pulses determined based on a rotational angle of the shaft of the motor;
step for detecting a desynchronization of the motor by comparing the motor drive pulses with motor pulses supplied thereto to produce a stop signal; and
step for stopping the motor being driven based on at least the stop signal.
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5. A liquid transfer apparatus having a syringe comprising:
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a syringe tip in the syringe moved in two mutually opposite directions to draw liquid into the syringe and discharge the liquid therefrom;
a motor for moving the syringe tip;
a motor controller for supplying a signal to the motor to drive the motor and to stop the motor based on a stop signal supplied thereto;
a motor movement signal generator for generating a signal representative of rotational movement of a shaft of the motor; and
a desynchronization detector for detecting a desynchronization of the motor by comparing the signal representative of rotational movement of the shaft of the motor from the motor movement signal generator with the signal to drive the motor from the motor controller. - View Dependent Claims (6, 7)
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8. A method of operating a syringe having a syringe tip movable to draw liquid into the syringe and discharge the liquid therefrom, comprising:
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issuing a drive control signal corresponding to a desired amount of movement of the syringe tip;
moving the syringe tip responsive to the issued drive control signal;
generating a drive signal corresponding to an actual amount of movement of the syringe tip responsive to the issued drive control signal; and
comparing the generated drive signal with the issued drive control signal, to detect a desynchronization. - View Dependent Claims (9, 10)
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Specification