Apparatus and method for folding blanks
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United States of America Patent
Stats
-
Feb 10, 1998
Grant Date -
N/A
app pub date -
Jan 11, 1995
filing date -
May 16, 1991
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The present invention relates to a method and apparatus for folding by approximately 180.degree. a first surface portion of a blank on a rotating drum about a score line onto a second surface portion of the blank. A shaping rail comprises a first surface for acting on a first side of the first portion of the blank to initiate folding the first portion about the score line, a second surface for acting on a second side, opposite the first side, of the first portion of the blank to complete the approximately 180.degree. folding of the first portion about the score line, and a spiral edge for transferring the first portion of the blank from the first surface to the second surface. A first inner guide rail comprising a cylindrical outer surface facing the second surface of the shaping rail and a second outer guide rail having a cylindrical inner surface facing the first surface of the shaping rail are provided to further guide the blank during folding.
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