062-11 Lohr, 2011-06-24

Pneumatic compensating roller control from Rexroth

Electropneumatic pressure regulators

Electropneumatic pressure regulators apply compensating roller control in printing presses

When working with paper and foil webs, trouble-free, continuous operation is just as important as high speeds. Keeping the mechanical tension on the material webs constant is a key task in this context. The solution is an electropneumatic pressure regulator that enables automatic web tension. Pressure regulators from Rexroth’s ED series quickly and accurately adjust deviations in the compensating roller.

To keep the web tension on a printing and processing machine constant, a vertically mobile compensator is hung onto the material web. A web tension regulator maintains the position of the compensator in the center. The compensator position is recorded via a potentiometer. The material web tension must be kept constant to avoid operating problems. If the web tension is too high, the material may tear. If the web tension is too low, the material may flutter, leading to a disturbance in the process or a torn web.

A pneumatic cylinder supports the compensating roller in its function. Despite drive control, changes in tension through a reel change or out-of-roundness in the material reels move the compensating roller, which then displaces the pneumatic cylinder. The increased or decreased pressure thus created in the pneumatic system is recognized by the controller. An ED02 electropneumatic pressure regulator creates a change in output pressure via a set/actual point comparison, which then adjusts the pressure on the compensating roller so that the web tension remains constant.

The ED02 is the smallest pressure regulator of the Rexroth ED series. In the ED series valves, the manufacturer has combined the control electronics, a pressure sensor and a direct drive via proportional solenoids in a compact unit.

Deviations of the compensating roller can be quickly adjusted due to the ED02’s high dynamic capabilities. With its external dimensions of 76 x 60 x 30 mm, the ED02 electropneumatic pressure regulator has a compact design, making it suitable for universal use in printing presses.

Bosch Rexroth AG is one of the world’s leading specialists in the field of drive and control technologies. Under the Rexroth brand name, the company supplies more than 500,000 customers with tailored solutions for driving, controlling, and moving. Bosch Rexroth is a partner for Mobile Applications, Machinery Applications and Engineering, Factory Automation and Renewable Energies. The company provides customized solutions tailored to the needs and specifications of each individual market. As The Drive & Control Company, Bosch Rexroth develops, produces, and sells components and systems in over 80 countries. As part of the Bosch Group, Bosch Rexroth and its 34,900 associates generated approximately 5.1 billion euros in revenue in 2010.

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The Bosch Group is a leading global supplier of technology and services. In the areas of automotive and industrial technology, consumer goods, and building technology, some 285,000 associates generated sales of 47.3 billion euros in fiscal 2010. For 2011, the company forecasts sales of more than50 billion euros and a headcount of a good 300,000 by the end of the year. The Bosch Group comprises Robert Bosch GmbH and its more than350 subsidiaries and regional companies in over 60 countries. If its sales and service partners are included, then Bosch is represented in roughly150 countries. This worldwide development, manufacturing, and sales network is the foundation for further growth. Bosch spent 3.8 billion euros for research and development in 2010, and applied for over 3,800 patents worldwide. With all its products and services, Bosch enhances the quality of life by providing solutions which are both innovative and beneficial.

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