| 摘要 |
<p>A continuous paper band folding apparatus to form paper sheet piles, which apparatus allows the formed folds to be squeezed and the paper band (N) to be exactly cut in order to achieve separate piles (PC) of paper sheets. The apparatus comprises two rotating shafts (10A & 10B) carrying blades (1-9) which engage the paper band (N) and provide to form a fold therein by the particular radial and longitudinal arrangement of the blades forming a cusp symmetric with respect to the point of engagement with the paper band (N). Blades (1-9) are rotated synchronously with the feed of paper band (N) so that initially a natural loop (CRN) is allowed to be formed in the paper band (N) when the blades do not interfere therewith. Then the vertex of the cusp formed by the blades (1-9) engages the paper band (N), thus causing it to be folded back. Afterwards, due to the radially offset arrangement of the blades (1-9) along the shaft, the folding back of the paper band (N) carries on progressively on either side of the central cusp, thus avoiding the undesired crumpling of the paper sheets. The apparatus is also provided with a retractable device which is synchronized with the rotation of the blade carrier shaft and guides the paper band (N) to keep on the natural fold (CRN).</p> |
