| 摘要 |
<p>A stack (15) of folded sheets comprises first and second groups of folded sheets. Each of the sheets (16;17) of each group includes a center panel (18;28), a second panel (21;31), and a V-shaped portion (22;32) including third (24;34) and fourth panels (26;36). The sheets of the two groups are alternately arranged so that the second panel (21;31) of each sheet of each group is adjacent a fourth panel (36;26) of a sheet of the other group. The adjacent second and fourth panels may or may not be interleaved. Adjustable folding boards (71) are provided for folding elongated webs (73) into the first and second folded sheets (16;17). Each of the folding boards (71) includes a slidably mounted first plate (77) which folds the fourth panel of the folded sheet. A second plate (81) extends downwardly from the first plate (77) and is also slidably mounted for movement transversely to the web. Third and fourth plates (83,84) are mounted in front of the second plate (81). Adjusting the first and second plates (77,81) relative to the web (73) changes the width of the fourth panel (26;36). Adjusting the third panel (83) relative to the web (73) changes the widths of the central panel (18;28) and the third panel(26;34). Adjusting the fourth plate (84) relative to the web (73) changes the widths of the central panel (18;28) and the second panel (21;31).</p> |
