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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.
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.
For more Information
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