The present invention relates in general to a bag packing apparatus, and more particularly, an apparatus for automatically opening, packing and sealing, successively, conveyed paper or plastic bags or the like.
In a heretofore known bag packing apparatus as shown in FIG. 1, wherein three-sided sealed bags 1, made of paper or plastic films with mouths 2 along their top edge, are charged with contents by means of a charging device 3 and tightly sealed 4, it was a common practice to convey the bags 1 successively in the direction of their width by means of chain conveyors 5. However, such apparatuses in the prior art have the following shortcomings, and consequently, many problems remain unsolved for establishing common availability for different bag sizes and for speeding up processing capability. For example, when the sidth of the bags changed it was necessary to change the mounting distance in the widthwise direction between the bag gripping claws 6 within the conveyor pitch P.sub.1 for each attachment. This resulted in a very complex structure and adjustment requirements for the machine; size change was not easy. In addition, in order to enhance the processing capability, the conveying speed had to be raised to a higher speed due to the fact that the bags were conveyed in the widthwise direction, and especially when the contents of the bags were liquid, there was a disadvantage in that the liquid would squeeze out of the top edge of the bag due to acceleration, resulting in further adverse effects upon sealing.