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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