Back to results
US 4,285,685 AGranted
Apparatus for forming loops in tube sections for making sacks for the purpose of compensating for different lengths of sections
AssigneeWindmoller & Holscher
InventorFritz Achelpohl
Life of this patent
Estimating the term…
Abstract
Sections of bag-making material are successively and intermittently fed by double belt conveyors to arrive beneath a vertically reciprocatable push member which engages each section by suction and forms a central loop in each section while its ends are yieldingly engaged by brake shoes co-operating with side supports.
Claims12
Apparatus for forming loops in transversely fed tube sections for making sacks, comprising two parallel double belt conveyors (10, 16;
- 11, 17) for clamping the tube sections at both sides at equal spacings from their centre line, a punch (28) vertically movable in the medial plane (35) between the double belt conveyors (10, 16;
- 11, 17), means for raising and lowering said punch, and suckers (29) positioned on the lower end portion of said punch for suction attracting tube sections.
Apparatus for forming loops in transversely fed tube sections for making sacks comprising:
- means for conveying tube sections comprising two parallel double belt conveyors spaced apart from each other to define a gap therebetween, said belt conveyors clamping and defining a conveying plane for fed tube sections;
- punch means positioned in the center of said gap for forming loops in the tube sections, said punch means comprising a punch having a lower end portion movable from a first position spaced above the conveying plane to a second position spaced below the conveying plane and sucker means carried by the lower end portion for suction attraction of the tube section during downward movement of the punch to form the loop;
- and
- means for controlling movement of said punch between said first and said second positions.
1 more element
Dependencies are inferred from the claim text.