| 摘要 |
<p>A shock absorber assembly (50) for a finish looper (32) that reduces breaks of an asphalt-coated sheet (20). The finish looper (32) includes a plurality of looper rolls (34) forming a plurality of free hanging loops of the asphalt-coated sheet (20). The shock absorber assembly (50) is mounted on a frame structure (52) capable of relative movement with respect to the looper rolls (34). The shock absorber assembly (50) includes a plurality of rolls including an indexing roll (54), a guide roll (70), and a shock roll (64) positioned between the indexing roll (54) and the guide roll (70). Just prior to the last free hanging loop (62) being completely payed out, the shock roll (64) is in an up position and the indexing roll (54) is in a down position. When the asphalt-coated sheet (20) is further payed out, the asphalt-coated sheet (20) engages the indexing roll (54) and causes it to pivot (58) from the down position to an up position. The weight and acceleration of the adjacent, upstream free hanging loop (74) causes the shock roll (64) to move from the up position to the down position. The movement of the indexing roll (54) and shock rolls (64) shortens the path length of the asphalt-coated sheet (20) through the shock absorber assembly (50) and reduces the acceleration rate of the sheet (20) in the next loop, thereby reducing breakage of the asphalt-coated sheet (20) when it is payed out from the last free hanging loop (62). A method of reducing breaks in the asphalt-coated sheet (20) is also described.</p> |
