초록 ▼

A low inertia rotary drum supports sheets of paper of different sizes for transport and processing. The drum has a plurality of leading edge ports formed in its surface along the length of the drum. A vacuum is selectively applied to one or more of the ports in accordance with the dimension of the p

A low inertia rotary drum supports sheets of paper of different sizes for transport and processing. The drum has a plurality of leading edge ports formed in its surface along the length of the drum. A vacuum is selectively applied to one or more of the ports in accordance with the dimension of the paper in the direction of the length of the drum. The drum has a plurality of sets of trailing edge ports formed in its surface with each of the sets being disposed a predetermined arcuate distance from the set of leading edge ports in accordance with the other dimension of the paper. Each set of trailing edge ports has the ports arranged longitudinally along the drum and parallel to the set of leading edge ports. Only one set of trailing edge ports extends for the same length as the set of the leading edge ports. One of the sets of the trailing edge ports has a vacuum applied thereto with the same number of ports of the trailing edge set having the vacuum applied thereto as the number of the leading edge ports.

대표청구항 ▼

An apparatus for supporting rectangular shaped, flexible sheets of various sizes thereon including: transporting means having a surface for transporting the sheet; a first vacuum chamber having a first controlled vacuum; a second vaccum chamber having a second controlled vacuum; first connecting mea

An apparatus for supporting rectangular shaped, flexible sheets of various sizes thereon including: transporting means having a surface for transporting the sheet; a first vacuum chamber having a first controlled vacuum; a second vaccum chamber having a second controlled vacuum; first connecting means to continuously connect said first vacuum chamber to a first area of said surface of said transporting means for attaching the leading portion of the sheet to said surface of said transporting means; first control means to selectively control the portion of the first area of said surface of said transporting means to which the first controlled vacuum from said first vacuum chamber is applied through said first connecting means in accordance with one of the dimensions of the sheet; second connecting means to continuously connect said second vacuum chamber to at least one other area of said surface of said transporting means spaced from the first area of said surface of said transporting means in the direction of the other of the dimensions of the sheet; and second control means to selectively control the portion of the other area of said surface of said transporting means to which the second controlled vacuum from said second vacuum chamber is applied through said second connecting means for attaching the trailing portion of the sheet to said surface of said transporting means in accordance with at least the one dimension of the sheet.