| 摘要 |
<p>An apparatus for the high speed stacking of sheets or forms, both by accordion-like folding of a continuous band (12) and by superimposing separate sheets comprises two pairs of rollers, upper and lower respectively, adapted to get into contact with the band for the tearing off thereof along a prepunched line. One of the upper rollers has at least one bevelled portion (24a) whereas the lower rollers (26) are cylindrical. At least one of the rollers (26) is permanently rotating at a speed higher than that of the rollers (24). The lower rollers at rest are spaced when said bevelled portion (24a) takes a position in front of the plane of the band (12) and when said aforesaid roller (24) is at rest and come into friction contact with said band (12) in the operating condition when the upper rollers are brought into contact with the band in operating condition. Pressing means (72) are positioned between said upper and lower rollers, the pressing means being displaceable from a position in which are detached from the band (12) when the upper and lower rollers are at rest, to a position in which are engaged therewith during the tearing phase, when said rollers are in the operating condition. The sheet stacking plane (46) is provided with sensing means (84) and with ejecting means (78, 80) for the sheet packages.</p> |
