Tumbling "Combination scale" is to rely on the drum outside the chamber and the seal cavity through the inner surface of the housing to achieve measurement. Suitable for stability and good mobility density packaging materials. Packing drum drum metering device into a fan of prepackaged adjustable metering device and channel section cylindrical drum cavity quantitative two packaging metering device. Packing drum fan metering devices, mainly from the hopper, drum, shell and machine folder and so on. "Combination scale" works as follows: the drum shaft rotational motion in the role of testimony, when the fan-shaped drum groove on the lower part of the hopper to the feed tube position, material from the hopper through the feed tube fall into the drum fan-shaped groove; when the drum roll-out of the feeding tube position, from the inside surface of the housing sector tank will scrape the excess material, to ensure consistent material volume drum cavity and the outside surface of the shell cavity sealed container; when metering when the cavity with the drum to the discharge pipe, the material through a feeding tube falls into bags, complete metering automatic blanking requirements. Channel section adjustable cavity cylindrical drum "Combination scale" means, mainly by the hopper, drum, shell, folders and other regulatory agencies and machine components. It works with fan-shaped drum packaging. It is by turning the adjustment screw, change the position of the metering plunger cavity plate to achieve metering regulation.