of selecting a coil feed line
Consider capital cost, space, and applications
This space-saving, underslung line is very compact—in the 15-ft. range. Line length is not as dependent on passline height as with the
paddle loop design.
By John Heuring
Metal stamping in today’s
market has never been
more challenging. With
dynamic forces causing financial
stress from all sides, metal stamping companies need the most cost-effective methods to produce parts.
Naturally, economics should be
considered in the selection of a coil
feed line as well.
Some space-saving lines may be
surprisingly affordable. In terms of
capital investment, some are less
costly than conventional feed lines
with similar specifications.
Factoring in the economics inherent in a small footprint—if a building expansion is required for a
larger line, for example—a space-saving line may be the most economical option.
Categories of space-saving coil feed
lines, from the least expensive to the
most expensive, are the paddle loop,
underslung, and synchronous.
Paddle Loop Line
The paddle loop line (see Figure 1)
includes a powered feeder/straightener
or a servo feed with a pull-through
straightener and a powered reel. A load
car is optional. To conserve space, the
loop is developed below the reel’s spindle and controlled with a laser or loop
If the feeder is equipped with a pilot
release-capable pull-through straightener or a powered feeder/straightener
with a piloting straightener is used, all
upper rolls can be released for piloting,
making this line suitable for progressive-die applications. The addition of a
stand-alone hold-down arm/peeler/
threader/debender with exit flip table
provides a hands-free threading
Capabilities and limitations are:
•The line is compact, ranging in
length from 16 to 26 feet, depending
on the passline.
•It can be sized for any coil weight
•It is simple to operate and learn.
•Optional equipment allows hands-free threading and pilot release.
•Maximum material thickness is
limited to approximately 0.25 inch.
•The material travels over itself at
the top of the coil, possibly causing
marks in some high-polish materials.
•Long progressions must be
reviewed carefully to determine if the
desired speed is attainable.
Because the process stops and starts,
it is not suitable for cosmetic parts. It is
designed for limited-space applications
in which progressions are not excessively long.
This system includes a powered feeder/straightener or a servo feed with pull-through straightener with a powered
reel and load car (see lead image). To
conserve space, the loop is developed
below the reel’s spindle and controlled
with a laser or loop light system.
Again, if the system is equipped with
a pilot release-capable pull-through