Challenge CMT 330, Installation And Operator'S Manual

Page: 66 / 68

APR 2018
CMT-330 Three Knife Trimmer 5-4 5. Book Quality
5.7 All Sheets Not Cut
Description
Bottom sheets are not being cut.
Figure 5-7. Not Cutting Through
Possible Causes

The knife is not adjusted to cut deep
enough.

The cut stick or cut plates may be worn
out.
Solutions

If not cutting deep enough on the face of
the book, adjust the face knife according
to instructions in section 4.4.2 Knife Ad-
justment on page 4-7.

If not cutting deep enough on the top or
bottom faces of the book, adjust the side
knives according to section 4.4.2 Knife
Adjustment on page 4-7.

Replace the cut stick or cut plates.
5.8 Book Not Square
Description
The book appears as though it was not cut
square.
Possible Causes

The book was allowed to cool with a
twisted binding as shown in Figure 5-8.
When the book is straightened after
trimming, it looks similar to the book
shown in Figure 5-9. This is the most
common cause of out of square, espe-
cially in a Stand-Alone trimming applica-
tion where the binding has had signifi-
cant time to harden.

Cover overhangs the book. The over-
hang reduces the reliability of the squar-
ing process within the trimmer.

Glue was applied past the binding, leav-
ing a knob-like protrusion. The protru-
sion interfered with the trimmer's squar-
ing process.

Normal wear has forced the cutting or
transport mechanisms out of square.
Solutions

Carefully handle books with soft bind-
ings. Keep twist out of the binding when
storing. Allow bindings to harden before
stacking.

Cut cover to fall within the size of the
untrimmed book.

Adjust binder such that glue will not be
applied past the end of the binding.

If normal wear has forced the cutting or
transport mechanisms out of square, re-
fer the problem to an authorized service
agent.
Figure 5-8. Twisted Binding
Figure 5-9. Straightened Binding