Abstract: An apparatus for centering a log to allow an optimum yield axis and a maximum radius of rotation of the log to be calculated more accurately than conventionally possible. The angle of rotation of a log M is detected by a rotation angle detector that is engaged with a preliminary axis c about which the log M is rotated. A contour of the log for calculating the optimum yield axis of the log and a contour for calculating the maximum radius of rotation of the log are measured separately. The contour for calculating the optimum yield axis is measured in a fixed-point manner by measuring the log at a plurality of certain measurement points with beam reflection scanners. The contour for calculating the maximum radius of rotation is measured in a comprehensive manner using swing-angle detectors engaged with contact-swinging detection members provided individually in the plural measurement sections.

Abstract: A method and apparatus for centering a log allow a optimum yield axis and a maximum radius of rotation of the log to be calculated more accurately than conventionally possible. The angle of rotation of a log M is detected by a rotation angle detector 6 that is engaged with a preliminary axis c about which the log M is rotated. A contour of the log for calculating the optimum yield axis of the log and a contour for calculating the maximum radius of rotation of the log are measured separately. The contour for calculating the optimum yield axis is measured in a fixed-point manner by measuring the log at a plurality of certain measurement points with beam reflection scanners 8 disposed at appropriate intervals along the axis of the log M.

Abstract: A rotary solenoid includes a rotating shaft on which a rotor is fixedly mounted, a pair of stators arranged on both sides of the rotor and a driving coil disposed around the stators. The opposed arrangement of the pair of stators allows to rotate the rotating shaft at high speed. When the rotary solenoid is combined with a one-way clutch, there is provided an apparatus for converting an oscillating rotary motion into an incremental and intermittent rotary motion, which may be advantageously applied to a system for advancing an ink ribbon in a printer and the like.