Challenge CMT-130, Service Manual, Page: 84 / 226

FEB 2017
3. Book Quality 3-4 CMT 130 Book Trimmer
BQ 3.7 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 (REP 4.3 Knife
Depth Adjustment).

Rotate or replace the cut stick (REP 4.1
Cut Stick Replacement).
BQ 3.8 Book Not Square
Description
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 3-8.
When the book is Straightened after
trimming, it looks similar to the book
shown in Figure 3-9. 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 and/or reduce jogging
pressure. See Installation and Opera-
tor's Manual.

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 4.7 Squaring Adjust-
ment.
Figure 3-8. Twisted Binding
Figure 3-9. Straightened Binding