DEVICE FOR FOLDING PAPER BAGS IN A Z SHAPE

摘要

Apparatus for folding paper sacks to a Z shape about transverse fold lines comprises scoring wheels for defining the fold lines, folding blades and folding means consisting of folding bars for turning the sacks about the folding blades. A first double belt conveyor clampingly engages each sack near its base or filling aperture and conveys it continuously through the folding means. Two parallel shafts mounted in the machine frame in a vertical plane transverse to the conveying direction each carry two spaced co-operating scoring wheels which provide the passing sacks with scoring in opposite senses. A second double belt conveyor provided parallel to the first engages the sacks at the opposite end, has a length equal to the scoring and holds each sack while passing through the scoring wheels. A third double belt conveyor adjoining the second and parallel to the first clamps each sack between the first double belt conveyor and the scoring facing same during folding about this scoring. A first folding blade parallel to the third double belt conveyor has its folding edge disposed near the first scoring and a first folding bar has its rear end below the plane of the rear end of the first folding blade and the front end overlapping the front zone of the first folding blade. A fourth double belt conveyor adjoining the third clamps the sack in the region of the first fold. A second folding blade parallel to the fourth double belt conveyor has its folding edge near the second scoring above the first fold. A folding bar is provided which turns the free sack portion over the second folding blade.