User's Manual

Control the stacking limit
The BFM is designed to stack up to the equivalent of 3000 sheets of 20 lb paper. The BFM detects when
it’s getting close to full and automatically schedules an unload at completion of the next set or compiling
eject. A 3000-sheet stack can become unwieldy to unload. Also, 3000 sheets of oversized 11x17 or A3
paper can be excessively heavy to lift off of the stacker and transport for downstream processing. You
can customize the stacking limit through the GUI in the Stacking tab of the Printer Manager pathway. On
the Stacking tab right click on one of the finishing devices presented and select Stacker Limits from the
menu. Use this to set stacker unloading to a more comfortable stack size. Use it also to combat the
effect of accumulating up curl in very large stacks to avoid unnecessary interruptions that require more
complex operator intervention in recovery. With two BFM’s productivity is maintained with automatic
stacker switching when one becomes full. Figure 1 below presents the dialog that is available for doing
this. Note that the stacker limit can be set unique for each stacker if you happen to have more than one.
You might find this useful if you want to run letter sized jobs and ledger size jobs each with different
stacking limits; direct each job to their specific stacker. This stacking limit can be changed as often as
desired.
The system will count sheets delivered to the stacker and will either unload when the limit is reached or
when it detects it’s full; whichever comes first. Note that this limit you’ve set is not a precise limit. It’s
more specifically a “do not exceed” limit and the system factors in the set size or compiling limit of the
current set in progress and will schedule an unload when it determines that the next set to be processed
could exceed the limit.
Improve stacking quality and BFM reliability through management of paper
curl
To achieve the best quality stacks and to get the optimum performance out of the BFM it is crucial to
minimize the amount of curl in the paper that is delivered to the stacker. A variety of factors contribute to
the amount of curl in your output including quality of paper being used, grain direction in the paper,
temperature of the fuser and orientation of the output in the stack. Curl is primarily an issue in lighter
weight papers less than 20 lb or 75 gsm. There are several things you can do to minimize curl in your
output and some of those are mentioned here. For a more thorough understanding of curl contributors
and countermeasures please review the topic in the Nuvera User Guide and Training Aid.
The Nuvera system is designed to optimize fusing performance across the entire range of paper weights
and types that it is specified to support. A key capability is intelligent control of the fusing temperature to
maintain optimal fuse fix performance for each paper that passes through the system. This Automatic
Image Permanence for All Stock Weights control (AIP) relies on accurate input of paper weight and
type information so it is critical to properly enter these properties for each paper loaded in the machine.
In particular, lighter weight papers will be over stressed if they’re programmed with heavier weights.
Automatic Image Permanence for All Stock Weights is enabled by default and is accessible through
User Diagnostics in the System Optimizations dialog. You can turn off AIP in which case all media will be
fused at a lower temperature optimal for lighter weight papers. Then you can also select Heavy-Weight
Stock Jobs - Enhanced Image Permanence in which case media will be fused at a higher temperature
suitable for heavier media but the risk of curl on lighter weight media will result. Note also that the BFM
uses paper weight to optimize sheet in-set registration and compiling operation. Taking the time to
properly program paper weight information when loading trays will result in optimum overall system
performance and reliability.
Proper use of the Sheet Enhancement Module is also very helpful. The Sheet Enhancement Module
(SEM) is designed to automatically determine an optimum control for your output, taking into account
several factors including paper weight, paper type, and job programming characteristics. There are many
things that affect curl, so adjustments are provided to assist you, if necessary. The SEM adjustments are
accessible by selecting Adjust Decurler… in the Printer dropdown menu. It is best to enable automatic
control, which will automatically account for the most common changes that affect the output (paper
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