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Bulletin: SVB 102
Date Issued: 19 February, 2004
Category: Procedural
Subject: Trim Belt Tension Adjustment
Machine Models: Accustaks manufactured between January 2002 and
June 2003
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Description of Issue
Improperly tensioned trim belts
have an increased chance of premature failure. Prevent this by
checking and properly tensioning belts as part of regular periodic
maintenance.
Procedure for Correction
Check the tension and condition of
all the trim belts once a week. Measure the tension of the belt with
a linear spring scale (Granger part #5A354) before adjusting it. The
illustration below shows where to measure both upper and lower
belts. Pull the belt with the linear scale until it is 3” from the
trim arm. Use a 3” spacer or measuring tape to determine the correct
position. Tension for Boxbelt should be at 15-20 lbs. force.
Tension for round belt should be at 20-25 lbs. force.
         
 Each individual belt has a tension
adjustment fastened to the trim arm. There are three types of
tensioning devices: fixed tensioners, nose pulley adjustments and
rotary tensioners.
The fixed tensioner in Figure 1 is
located on the downstream end of the trim arm. The nose pulley in
Figure 2 is located near the die cutter. If both of these are
present on the machine, use the fixed tensioner.
| Figure 1. Fixed Tensioner |
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Figure 2. Nose Pulley |
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If the only adjustment location is
nose pulley shown in Figure 2, make sure that the nose pulleys are
properly aligned after tensioning the belts. All nose pulleys must
be aligned within +/- ý” of each other to prevent board from skewing
when it enters the trim section.
For either of these types, if the
tension on a belt is too loose, loosen both bolts and slide the
adjuster to increase tension. Retighten both bolts when finished.
Check the tension again and adjust a little more if necessary. Make
only small adjustments. Overtightening shortens the life of the
belt.
Rotary tensioners are located near
the downstream end of the trim section. This type of tensioner is
available as a retrofit. Adjustments are on the back of the
tensioner mount.
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Figure 3. Rotary Tensioner
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If the tension on a belt is too
loose, adjust it as follows:
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Remove the cap screw on the back of the tensioner mount.
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Loosen the bolt to the tensioner.
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Rotate the tensioner to the next notch.
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Retighten the bolt to the tensioner.
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Replace the cap screw.
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Check the tension again. If it is still loose, repeat the
procedure and tighten by one more notch.
Do not adjust
the tension by more than one notch at a time. Overtightening
shortens the life of the belt.
Keep a spare set of belts on hand
at all times. For assistance with trim belt tensioning or
replacement, contact Customer Service at 509-535-0356 and select
option 2.
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