| 摘要 |
A mechanical folding device fires a multiplicity of pins through an air table and a multiplicity of parallel endless belts forming the conveyor to lift a flexible foldable length of material, such as a plastic film bag body, into a catching device such as a pair of nip conveyors carrying sets of folding belts for completing the fold and carrying the length of material away from the first conveyor. The pins are fired through the air table and conveyor belts by means of a torsion bar coupled by means of lever arms to a carriage carrying the pins. The torsion bar is mechanically loaded by a first air cylinder while the carriage is locked in a lowered position. When the carriage is released by a second air cylinder, the torsion bar first accelerates the carriage upward then decelerates the carriage during the upper half of the extension of the pins. The bar forces the pins to return to a retracted position within the air table.
|
