| 摘要 |
PROVIDED IS A STACK OF SHEETS INCLUDING A PLURALITY OF INDIVIDUALLY FOLDED SHEETS WHICH ARE STACKED VERTICALLY ONE ON A TOP OF THE OTHER VIA AN OVERLAPPING PORTION HAVING A PREDETERMINED WIDTH SO THAT AN UNDERLYING SHEET IS LIFTED ALONG WITH AN OVERLYING SHEET WHEN THE OVERLYING SHEET IS WITHDRAWN. EACH SHEET IS FOLDED ABOUT FOLD LINES ALL PARALLEL TO ONE SIDE OF THE SHEET TO DEFINE TWO CENTRAL PORTIONS, A TOP FLAP PORTION FOLDED UPWARD UPON ONE CENTRAL PORTION, AND A BOTTOM SLAP PORTION FOLDED DOWNWARD UNDER THE OTHER CENTRAL PORTION. THE FOLDED SHEETS ARE STACKED UP SO THAT THE ODD-NUMBERED SHEETS AND THE EVEN-NUMBERED SHEETS ARE ALTERNATELY ARRANGED, AND THAT THE TOP FLAP PORTION OF THE UNDERLYING SHEET OVERLIES THE BOTTOM FLAP PORTION OF THE OVERLYING SHEET TO DEFINE THE OVERLAPPING PORTION.(FIG 1) |
