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| PT-Tracking
Roller Assemblies : |
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| PT-Tracking roller assembly (TRA) consists of two
rectangular steel tubing frames. One is stationery, the other is movable;
it is supported in a nylaguide sliding block and arcuate bar system,
and has an idler roller at either end. The web can be fed over the
TRA in a 'U' shaped path, reversing its direction of travel, or through
the TRA in a 'Z' configuration, maintaining the same direction of
travel. It is insensitive to attitude and can even be mounted upside
down. Solidly supported on all four corners by nylaguide bearings,
it is not subject to deflections caused by cantilever stresses. Radial
bearings are sealed, and linear bearings are self-cleaning and self-lubricating.
The unit therefore requires no maintenance. |
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| The Principle: |
| The TRA is designed so that it swings in an arc
laterally, pivoting about an imaginary pivot point located exactly
in the plane of the entering web path. The servo cylinder swings the
other end of the frame, moving the outgoing web laterally back into
the desired web path. Because the TRA correction range is increased
by lengthening the span. Therefore the correction angle can be kect
small to reduce induced stresses to the level desired. Because stresses
can be kect minimal, the TRA can be used to guide within the tension
loop on your process. It can be installed successfully on lines handling
fragile materials such as parchment paper, thin metal foil, or saturated
paper even when other guiding methods have failed. It can also be
used to make economically large corrections in the web path, even
displacing the shifting unwind, because of its very low inserted sness
level. |
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| Description : |
| Standard adacter bases consists of a stationary
floor-mounted frame or plate, a four unit, standard nylaguide bearing
and support system, and a moving frame or plate. A heavy duty servo
cylinder is nested between the frames and the nylaguide bearings.
The servo cylinder moves the upper adacter base plate back and forth
in response to hydraulic signals from the power unit. |
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| Applications : |
The
PT adacter base is designed for use in applications where
the unwind or rewind stand must be shiftable. By fitting the
adacter base under the stand, a simple and economical installation
is obtained. Because of the relatively high mass of the unwind
or rewind rolls, its use is most often found in applications.
Where response time can be relatively slow, and where accuracles
are not overly critical.
In Rewind guide the detector
is attached to the moving frame before fixed idler with sufficient
warp to stabilize Web. |
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| In Unwind guide the idler roller attached
on moving frame before the fixed detector to stabilize the Web. |
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| Turn
Bar System with two webaligner for Double Side Lamination |
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TRA Web Guide 60" 24" |
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Two Stage Winder |
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Turn bar arrangement |
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Safety Check Holder |
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