Handling signatures with side belts running at different speeds

Details Handling signatures with side belts running at different speeds Handling signatures with side belts running at different speeds

B - Operations, Transporting

65

G

270/41

B65G 59/00 (2006.01) B65H 29/12 (2006.01)

Patent

CA 2021791

-45- HANDLING SIGNATURES WITH SIDE BELTS RUNNING AT DIFFERENT SPEEDS ABSTRACT OF THE DISCLOSURE A stream of signatures which are effectively thicker along one edge than an opposite edge are conveyed in a stream so that the signatures pass from a substantially horizontal shingled condition to an edge-standing condition with the thicker edges of the signatures being upright and disposed on the same side of the stream. The edge- standing signatures move onto a consolidating conveyor where they are arranged more compactly. The signatures then pass onto an accumulating conveyor, which normally advances the signatures at a slightly slower speed than the consolidating conveyor. When enough signatures to make a bundle have passed onto the accumulating conveyor, the velocity of that conveyor is increased substantially, and the consolidating conveyor is momentarily stopped to produce a loose zone in the stream of signatures at the juncture of the consolidating and accumulating conveyors. A sword is extended into the loose zone of the signatures and pushes the signatures on the accumulating conveyor forward to form a distinct gap in the signatures to the rear of the sword. Compression fingers extend into the gap behind the isolated signatures on the accumulating conveyor and push them forward. The compression fingers push the isolated bundle through a board drop assembly, where boards are placed at each end of the bundle. Thereafter, the compression fingers compress the bundles between the boards so that a band may be secured around the boards and bundled. Belts on each side of the signatures as they move along the consolidated and accumulating conveyors engage the upstanding edges of the signatures and assist them in moving forward. The belts on opposite sides of the -46- signatures are operated at different speeds to compensate for skewing of the signatures induced by the thickening upstanding edges. This facilitates clean separation of the signatures with the sword. Preferably, the side belts along the accumulating conveyor are located at a lower level than any of the side belts disposed along the consolidating conveyor.

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