HOME  |  NEWS  |  BLOGS  |  MESSAGES  |  FEATURES  |  VIDEOS  |  WEBINARS  |  INDUSTRIES  |  FOCUS ON FUNDAMENTALS
  |  REGISTER  |  LOGIN  |  HELP
Blogs
Blog
Multi-Axis Digital Tension Control
10/4/2013

Image 1 of 2      Next >

Tension control applied in digital roll-to-roll web processing is enabling printed electronics applications to achieve the highest quality and high throughput required using advanced servo control technology.   (Source: Bosch-Rexroth)
Tension control applied in digital roll-to-roll web processing is enabling printed electronics applications to achieve the highest quality and high throughput required using advanced servo control technology.
(Source: Bosch-Rexroth)

Image 1 of 2      Next >

Return to Article

View Comments: Newest First|Oldest First|Threaded View
sschu
User Rank
Iron
Re: How do they do it?
sschu   10/22/2013 9:59:10 PM
NO RATINGS
Hello Naperlou, I am in the development department of Bosch Rexroth where this feature is programmed.

The architecture is that there are several controllers: One controller for each tension zone which can be tuned independently. The outputs of these several controllers are combined together within a "decoupling network" in order to achieve decoupling of the tension zones. With that every controller can control "it's own" tension zone independently, i.e. without affecting the tension in all other zones.

This leads to a much more robust system, i.e. a lower tendency for oscillations. The increased robustness can also be used to use "stronger" tension control parameters and therefore achieve a higher dynamic leading to a higher tension accuracy leading to a higher register accuracy.
In some applications the only way to get a stable tension is using this decoupling network feature, or to get a tremendous waste which is quite expensive in printed electronic applications. Estimating the yearly waste costs you get when you produce e.g. additional 60-100 feet waste at every machine start is astonishing.

Remark: "A perfect tension is a base – or better – THE base for a perfect register." 

The effect is independent of the web speed, i.e. it is present as well in digital printing applications as in printed electronic applications. One of the differences between these two is that in digital printing applications (e.g. inkjet) the printing unit does not affect (= transport) the web so that web tension variations directly influence the register and therefore the decoupling is recommended resp. needed. Printed electronic applications have higher accuracy demands so that best web tension stability is the measure.

See also: http://www.drive-and-control.com/technology/printing-smart-objects

Feel free to contact our colleagues in the US to get more information about our innovative tension control solution.

apresher
User Rank
Blogger
Digital Tension Control
apresher   10/4/2013 9:53:57 AM
NO RATINGS
Naperlou, Many applications can use a single machine controller with groups of axes (forming tension control zone) linked together in software using a combination of electronic gearing, electronic camming and inputs from feedback devices including high speed programmable limit switches, sensors and/or load cells.  Each of the zones use software to achieve digital tension control within a specific zone (using distributed processing by running motion algorithms in the servo drives) but each zone is also melded into the overall process as well. Higher performance systems in this area are examples of very sophisticated adaptive control.  Hope that helps.

naperlou
User Rank
Blogger
How do they do it?
naperlou   10/4/2013 9:41:50 AM
NO RATINGS
Al, this is an interesting approach.  I looked at their site, and the pdf.  It is not really clear how they do it.  Are there multiple independent controllers or is one controller programmed to treat each zone independently?

Partner Zone
More Blogs
An Israeli design student has created a series of unique pieces of jewelry that can harvest energy from default movements of the body and even use human blood as a way to conduct energy.
If you see a hitchhiker along the road in Canada this summer, it may not be human. That’s because a robot is thumbing its way across our neighbor to the north as part of a collaborative research project by several Canadian universities.
Stanford University researchers have found a way to realize what’s been called the “Holy Grail” of battery-design research -- designing a pure lithium anode for lithium-based batteries. The design has great potential to provide unprecedented efficiency and performance in lithium-based batteries that could substantially drive down the cost of electric vehicles and solve the charging problems associated with smartphones.
Help us recognize engineers who are ahead of the trends and making big moves in the design engineering community.
Robots in films during the 2000s hit the big time; no longer are they the sidekicks of nerdy character actors. Robots we see on the big screen in recent years include Nicole Kidman, Arnold Schwarzenegger, and Eddie Murphy. Top star of the era, Will Smith, takes a spin as a robot investigator in I, Robot. Robots (or androids or cyborgs) are fully mainstream in the 2000s.
Design News Webinar Series
7/23/2014 11:00 a.m. California / 2:00 p.m. New York
7/17/2014 11:00 a.m. California / 2:00 p.m. New York
6/25/2014 11:00 a.m. California / 2:00 p.m. New York
5/13/2014 10:00 a.m. California / 1:00 p.m. New York / 6:00 p.m. London
Quick Poll
The Continuing Education Center offers engineers an entirely new way to get the education they need to formulate next-generation solutions.
Aug 18 - 22, Embedded Software Development With Python & the Raspberry Pi
SEMESTERS: 1  |  2  |  3  |  4  |  5  |  6


Focus on Fundamentals consists of 45-minute on-line classes that cover a host of technologies. You learn without leaving the comfort of your desk. All classes are taught by subject-matter experts and all are archived. So if you can't attend live, attend at your convenience.
Next Class: September 30 - October 2
Sponsored by Altera
Learn More   |   Login   |   Archived Classes
Twitter Feed
Design News Twitter Feed
Like Us on Facebook

Sponsored Content

Technology Marketplace

Copyright © 2014 UBM Canon, A UBM company, All rights reserved. Privacy Policy | Terms of Service