| 摘要 |
A machine for stacking and bundling flexible sheets, such as the signatures that are delivered from a printed press, includes a succession of aligned conveyors. The sheets are deposited on the first conveyor where they accumulate in a generally horizontal disposition, one on top of the other, and the first conveyor withdraws sheets from the bottom of this pile and conveys them to a gate in a shingled condition. At the gate, which is narrower in width than the sheets, the sheets bow forwardly and rise upwardly at their leading edges until they stand on edge. It is in this condition that the sheets pass onto a second conveyor which moves them through another gate that is narrower than the first gate, so that the degree of bowing increases. The second conveyor moves slower than the first conveyor and as a result the flexible sheets consolidate in the upright condition on the second conveyor. Upon emerging from the second gate, the sheets pass between side conveyors which are closer together than the width of the sheets, and these conveyors also extend along a third conveyor. After a predetermined number of sheets have passed onto the third conveyor, that conveyor speeds up momentarily to produce a gap in the sheets, thereby separating the sheets ahead of the gap into a bundle which is forced onto a final conveyor. Boards are placed at the ends of the bundle, and the bundle is compressed and bound while in the compressed condition.
|
