| 摘要 |
<p>Apparatus for the shingling of cut sheets 11,12,13,14) of paper as they pass between conveyance on a high-speed tape conveyor (10) and a low-speed tape conveyor (16) is provided by means comprising a two-stage slowdown arrangement. At the first stage, a slowdown mechanism, comprising two rolls (33,36) arranged respectively above and below each sheet passing through a drop-off area (T) from the high-speed conveyor to the low-speed conveyor, serves to engage the tail portion of the sheet in a nip such that the sheet is slowed down to a speed approximately 30 to 40% of the speed of the high-speed conveyor. In this manner, the lead edge of a next succeeding sheet overlaps with the trailing edge of the nipped sheet in a drop-off area (T) from the high-speed tape conveyor (10). Downstream of the slowdown rolls is a stop roll (61) which serves to reduce the speed of the immediately preceding sheet to the speed of the low-speed tape conveyor, which is still slower than the speed of the slowdown rolls (33,36), such that the sheet passing through the nip of the slow-down rolls further overlaps with the immediately preceding sheet. The possibility of lead edge damage to the sheets engaging with a stop roll for shingling is effectively eliminated.</p> |
