Xxi.) Principles Of Mechanical Folding - Baum 2020 Instruction Manual

Principles of Mechanical Folding
The buckle folding principle
In buckle folding, each station consists of three rollers
and a buckle plate. The first two rollers are arranged one
vertically above the other and they carry the incoming sheet
into the buckle plate until it reaches a feed guide stop that
can be adjusted as required.
The sheet is delivered into the buckle plate at a deter-
mined speed. The leading edge strikes the paper stop. Once
against the stop the sheet continues to be driven. A buckle
forms in the space between the three rollers. As this sags
downward, it is picked up by the rotating rollers and the
fold is formed as the sheet passes through them.
It can be seen that in this case the folding process is not
restricted to any cyclical movement and is thus capable of a
very high output.
For each folding station it is possible to fit up to four
buckle plates, arranged alternately above and below. Buckle
plates that are not required for a particular folding operation
can be replaced by sheet deflectors, allowing one or more
buckle plates in a folding station to be by-passed. It is thus
possible to execute a large number of fold variations.
The gap between the rollers must be set to the thickness
of the paper that is passing through. Certain deviations
must be made for special types of parallel folding.
Figure 39
Figure 40
TP10243-3
Figure 41
Figure 42
Figure 43
Figure 44
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