Abstract: An off-line automatic viscosity measuring apparatus, which can execute viscosity measurement of a plurality of specimens while automatically replacing rotors, is provided. The off-line automatic viscosity measuring apparatus according to the invention has: a detachable rotor 7; a viscosity detection head 33 for executing viscosity measurement with the rotor 7 connected thereto; a detection head moving mechanism 34 for moving the viscosity detection head 33 up and down and left and right; a separation aid mechanism 50 for aiding in separation of the rotor 7 and the viscosity detection head 33; and a rotor magazine mechanism 40 for holding a plurality of rotors 7. The viscosity detection head 33 has a bottom end formed with a detection head attaching/detaching part for accepting the rotor 7. The rotor 7 has a top end formed with a rotor side attaching/detaching part being inserted into the detection head attaching/detaching part for connecting the rotor 7 and the viscosity detection head 33.

Abstract: A rotary viscometer has a control mode for measuring the viscosity of a liquid sample with a high viscosity or a high yield value in an ultra-low shear rate range using a spring relaxation method. In this rotary viscometer, a pivot protecting device attains a locked state in which a pivot is separated from a bearing and a rotor shaft is locked against the rotation therein, a released state in which the lock of the rotor shaft is released while the pivot is in contact with the bearing, and a latched state disposed therebetween, in which the rotation of the rotor shaft is locked and the pivot is in contact with the bearing. Responding to user's instructions, a control device controls a locking motor to bring the pivot protecting device to a designated state, and controls a rotational driving motor in accordance with the state. For the spring relaxation measurement, the control device controls so that the spring is wound up while the pivot protecting device is in the latched state.

Abstract: A rotary viscosimeter has a control mode for measuring the viscosity of a liquid by a spring relaxation method and a control mode for measuring the viscosity by rotating a rotor 6a at a constant speed. In this rotary viscosimeter, a driving power is transmitted from a driving power source to a rotor shaft 5b via a spring 4a for rotating the rotor 6a. The rotor shaft 5b is supported on a pivot 11 and a bearing 12. When the viscosity is measured by the spring relaxation method, locking of the rotor shaft 5b is released after the spring 4a is biased while the rotor shaft 5b has been locked. When measurement of the viscosity is performed by rotating the rotor 6a at a constant speed, the rotor 6a is rotated while the locking of the rotor shaft 5b is released. When measurement is not being performed, the rotor shaft 5b is locked and the pivot 11 is separated from the bearing 12.

Abstract: A rotary viscosimeter includes a rotor driven to rotate in a liquid, the viscosity of which is to be measured. A first drive shaft or rotor shaft supports the rotor and transmits a rotary driving force to the rotor. A rotary driving apparatus has a motor for driving the rotor with an output shaft for supplying the driving force. A second drive shaft transmits the drive force from the motor to the rotor shaft. A first link elastically links the output shaft of the motor with the second drive shaft to transmit the driving force therebetween. A support includes a pivot and a bearing for rotatably supporting the motor shaft and second link which by-passes the support for linking the rotor shaft with the second shaft. A detector senses the angular displacement between the output shaft and the rotor shaft. A pivot protector has a locking mechanism for locking the rotor shaft from rotating and for disengaging the lock. A pivot separating mechanism separates and engages the pivot and the bearing of the support.