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2750 op#3 R3.doc 10-02 Page 3-2
2
B
A
At the start of the process the drum turns counter-clockwise [1], taking the document through the lower
fold roll, then stopping at the point [2], where the distance between the leading edge of the document (A)
and the upper fold roll (B) equals the accordion panel width chosen by the operator. At this point the drum
reverses [3].
A
B
C
3
The loop (C) caused by the in-feed rolls and drum driving in opposite directions expands to the point
where it is trapped by the upper fold roll, thus making the first fold.
4
B
C
A
[2] Panel measuring phase
A measured length of the document is taken up by the
folding drum.
[3] Drum reversal develops a loop
The document continues to be advanced by the in-feed
rolls at the same time as it is being driven backward by
the drum
[4] Completion of the first fold
Pressure of the fold roll on the drum makes a sharp
crease at point C.