PROBLEM TO BE SOLVED: To solve problems in a conventional net-lifting device installed in the upper part of a side roller in which a net-supporting type roller is mainly used, and a net-lifting force greatly decreases when a large load is applied in the net-lifting, and thereby a net-lifting machine for winding the net around the roller and pulling the net is usually mounted separately from the supporting type roller.SOLUTION: A net-lifting device is installed in the upper part of a side roller provided at the hull ships side part and elevation-pivotally provided. The net-lifting device is pressure-releasably mounted with: a traction roller capable of being driven and rotated by a hydraulic motor mounted rearward, and slightly provided with a taper toward the tip direction and a supporting roller capable of being driven and rotated similarly by the hydraulic motor. In the traction of a mini-load, the net is supported between the traction roller and the supporting roller and pulled, and the net wound in the traction roller is suppressed by the supporting roller in the heavy load, and thereby a traction force is greatly increased and the net-lifting by multiple traction methods is made possible by a single body.COPYRIGHT: (C)2015,JPO&INPIT【課題】 サイドローラー上方に設置されている従来の揚網装置は網挟持型ローラーが主で、揚網時に大きな荷重が掛かると揚網力が大きく減少するため、挟持型ローラーとは別に網をローラーに巻き付けて牽引する揚網機を取り付けるのが常であった。【解決手段】 船体舷側部に設けられたサイドローラー上方に設置され、俯仰旋回自在に設けられた揚網用装置に、後方に装着した油圧モーターにより駆動回転可能で、且つ先端方向に向かって僅かにテーパーを設けた牽引ローラー及び、同様に油圧モーターにより駆動回転可能な挟持ローラーとを圧接解放可能に取り付けて、軽荷重の牽引時には牽引ローラー及び挟持ローラー間に網を挟持して牽引を行い、重荷重時には牽引ローラーに巻き付けた網を挟持ローラーで抑えることで牽引力を大幅に増加させて、単体で複数の牽引方補による揚網を可能に設ける。【選択図】図1
