Nishimura Seisakusho Co.

Tsuneo Yoshida

Toshiaki Yamaguchi

Hideo Mukai

An apparatus for suppressing the rotational fluctuation of a supply roll includes a drive source and a differential gear. The drive source is operatively connected to the first input shaft of the differential gear and a support shaft for the supply roll is operatively connected to the second input shaft via a variable speed gear. The output shaft is joined to both a hydraulic coupling and a control for the variable speed gear. A high frequency fluctuation of the rotation of the supply roll causes a forward or reverse rotation of the output shaft of the differential gear. The hydraulic coupling acts to retard the output shaft rotation thereby causing a braking or driving force to be applied through the differential gear to the supply roll for eliminating the rotational fluctuation of the supply roll. The variable speed gear functions to keep the second input shaft of the differential gear to rotate at a fixed average speed while the average rotational speed of the supply roll continues to gradually increase as the roll diameter is reduced with the progress of the unrolling operation.

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Tokyo, Japan

Tsuneo Yoshida