Bag Mouth Opening Device for Continuously Conveyed Bags

A bag mouth opening device for continuously conveyed bags, said device adhering a pair of opposed suction members to both sides of a mouth of each one of bags continuously conveyed along a bag conveying path at a constant speed and regular intervals and then moving the suction members away from each other to thereby open the mouth, wherein:

• the pairs of suction members continuously rotate in mutually opposite directions along moving paths of substantially elliptical shape while keeping their suction surfaces oriented frontally at all times in a plane substantially parallel to the bag conveying path and substantially perpendicular to surfaces of bags;
• and
• major axes of the substantially elliptical shape moving paths are inclined at substantially equal angles relative to the bag conveying path such that the major axes digress from the bag conveying path on the anterior side, and time the suction members take to make a single rotation is set to an integer multiple of time a bag takes to be conveyed for an inter-bag distance.