It is running current to install the swinging-derrick cargo gears on board such vessels as lumber carriers, steel-bar carriers, etc. because of their rational and economical duties. It must be reckoned, however, that there would be some problems in performance of the swinging-derrick type cargo gears if the conventional cargo winches that have been used for the union-purchase type cargo gears are applied to the swinging-derrick type cargo gears as they are. This report tries to clarify what the problems and resolutions in the cargo winches to be used for the swing-derrick type cargo gears are.