Our
Original Product |
Description:
A completely mechanical servo mechanism (
with integral cantilevered roll support arbor) for controlling
unwind tension on rolls of film, foil, paper, tape, wire,
and the like.
Operation:
This system is comprised of a compensating
brake inside a protective cover, and a sensing module consisting
of two rollers mounted on a pivoting bracket. This bracket
is spring loaded and adjustable. A feed-back cable connects
the sensing roller bracket and the compensating brake. Since
the sensing roller bracket is balanced against the initial
spring load (tension setting), the bracket and rollers actually
change the floating position by pivoting in response to changes
in roll diameter, speed, acceleration and coefficient of friction
changes within the brake system. The pivoting motion of the
bracket is transmitted by means of the feed-back cable to
the brake, constantly adjusting the brake force to keep the
system in equilibrium.
Application:
Any roll fed machine or process which has
moderate acceleration characteristics, does not require
extremely low tension, and does not have sever intermittent
web dynamics.
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Unwind
Tension Compensator with Reserve Roll Position and Splice
Table
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Unwind
Tension Compensator with Web Guiding |
Tension
Ranges:
The following standard tension ranges are available
for the completely mechanical system: 0.75-2.5, 2-10, 5-15,
7-21, and 8-25 pounds. The powered system can be furnished with
a low range of 80-240 grams. All ranges are infinitely adjustable
within the high and low limits. It is possible to convert from
one range to another through the use of conversion springs.If
a wider tension range is required, the Compensator can be furnished
with a low friction air cylinder in the sensing module in place
of the normal torsion spring. With this arrangement, it is necessary
to supply air to the Compensator at 80 PSI.
Damping
System:
A fluid type damping system is provided as
an included kit. If damping becomes necessary, the kit may
be readily installed in the Compensator.
Accuracy
of Control:
Under normal operating conditions, tension
is held to +/- 3% of the initial tension setting and is maintained
from full to empty roll.
Installation:
Standard construction units are furnished with
4 machined pads and mounting holes in the casting unit. Dual
units, heavy duty construction, and powered units are furnished
on plates of 1/2", 3/4", or 1" thickness, depending
on size and application. Mounting holes are provided in the
plates.
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