PROCEDURE FOR TENSIONING A RUBBER BELT
General Rule:
Operate the Rubber Belt (RB) with as little tension or stretch as possible.
Excessive tension requires an increase of compression on the RB in order
to achieve the same amount of shrinkage. It also increases the stress
on the RB and on the machine, causing premature wear on both.
AFTER INSTALLING A NEW RUBBER BELT OR AFTER EACH GRIND:
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Remove all
tension from the RB.
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Confirm that
there are two marks, 12" (30.5cm) apart, on both sides of the
RB.* If not, use a straight edge pushed against the belt's face,
between the bottom idler roll and the tension roll (see diagram
below), to straighten the curvature of the RB. Now, draw two thin
lines exactly 12" (30.5cm) apart on the flat edge (perpendicular
surface to the face) of the belt. Make these lines on both edges
of the RB.
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Increase the
tension evenly on both sides of the RB until the lines are the recommended
distance apart. (Note: To insure accuracy, the belt should be rotated
several times (4 - 5) before measuring the stretch). The recommended
settings are as follows:
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For a 2 5/8"
(67mm) SHIELD Iâ
or SHIELD I-Câ
Belt - Stretch preferably 1/8" (0.32 cm) to a maximum of 1/4"
(0.65 cm). Note: The 12" (30.5 cm) mark located on the side of
the Belt* should now preferably read 12 1/8" (30.8 cm) to a maximum
of 12 1/4" (31.11 cm).
For a 2" (51mm) SHIELD Iâor
SHIELD I-Câ
Belt - Stretch preferably 1/4" (0.65 cm) to a maximum of 1/2"
(1.27 cm). Note: The 12" (30.5 cm) mark located on the side of
the Belt* should now preferably read 12 1/4" (31.11 cm) to 12
1/2" (31.8 cm) maximum.
* UNITED STATES SUPPLY CO., INC. places these marks on all New Rubber
Belt's shipped. With age, however, these marks will fade and will
need to be reapplied. Obviously, the marks should be placed as accurately
as possible to help insure the proper tensioning of the RB.
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Continue checking
the distance between the lines until it remains constant.
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If the fabric's
appearance is desirable, the tension is now correct. The RB should
not require further adjustment until ground. For possible exceptions
to this rule, please see below.
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FINE-TUNING RUBBER BELT TENSION:
If a particular fabric corrugates after setting the tension as described
above, it generally means a little more tension is necessary to successfully
run this particular fabric.
Have someone positioned on both sides of the tension roll (if manual).
Tighten the tension roll uniformly (each side at the same time and same
amount) a single turn at a time, while watching the fabric as it runs.
As soon as the corrugation stops, tighten the tension roll one more turn.
(This extra turn allows for slight variances in the fabric from roll to
roll).
This should be a perfect setting for this particular fabric. Subsequent
fabrics may need similar adjustment.
Should you have any questions concerning this
process, the products used in this process (Rubber Belt Maintenance Products),
or have Difficulty in Tensioning, please contact us via support@ussupplyinc.com
or Fax 704-393-5628 or Tel 704-399-4276.
Copyright © 1997,1999 United States Supply Co., Inc. All
Rights Reserved
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