Challenge 130TC-A-160000, Service Manual

Page: 105 / 282

MAY 2019
CMT-130TC Book Trimmer 3-5 3. Book Quality
BQ 3.8 All Sheets Not Cut
Description
Bottom sheets are not being cut.
Figure 3-7. Not Cutting Through
Possible Causes

The knife is not adjusted deep enough.

The cut stick may be worn.
Solutions

Adjust the knife depth (ADJ 4.3 Knife
Depth Adjustment).

Rotate or replace the cut stick (REP 4.1
Cut Stick Replacement).
BQ 3.9 Books Not Square
Description
Books appear as though they are not cut
square.
Possible Causes

Books are allowed to cool with a twisted
binding as shown in Figure 3-8. When
a book is Straightened after trimming, it
looks similar to the book shown in Fig-
ure 3-9. This is the most common
cause of out of square.

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 that have soft
bindings. Keep twist out of the binding
while glue is setting.

Cut cover to match the size of the un-
trimmed book and/or reduce jogging
pressure.

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. See ADJ 4.6 Squaring Adjust-
ment.
Figure 3-8. Twisted Binding
Figure 3-9. Straightened Binding