| 摘要 |
A machine for making filled packages by which an air-operated rack bar drives pull rolls by which the bag material is unrolled from a supply roll. The bag material has pressure-sensitive coating and, after passing upwardly from the supply roll over guide rollers, it passes downwardly over a mandrel in a troughlike form and to which the articles to be packaged are delivered through a chute. During the downward operation of the rack bar, the pressure rolls operate to advance the sheet material. However, when the rack bar retracts or moves upwardly, the pull rolls do not operate, and at that time pressure blocks move against the bag material, and, as it is clamped, a knife severs the material so that the upper end of the filled packages is sealed and cut off, and at the same time the bottom end of the next succeeding bag is sealed. The bag material can be advanced by the pull rolls in the next cycle of operation. The machine is operated by compressed air and may operate either automatically or by actuation of a foot valve. |
