Inflatable clamp keeps the presses rolling

March 17, 2005
Web printing presses use flexible, rubberlike printing mats wrapped completely around 4-ft-long rollers.

Web printing presses use a clamp running the entire length of a roller to secure print media. But when the roller spins at 300 rpm or faster and the clamp is too heavy, it creates centrifugal forces that strain the journal bearings, causing the roller to wobble and degrade print quality. Engineers at Agfa Corporation( redesigned the clamp (US patent 6,705,226) using inflatable bladders manufactured by Pawling Corporation's Engineered Products Division ( to save time, money, and with no mechanical or electrical linkages, to reduce maintenance as well.

The new system uses a bladder nestled under a spring-steel clamp. Both run the width of the roller. When the bladder is depressurized, the spring exerts uniform clamping forces along the entire roller. Air sent through a rotary pressure collar on the roller shaft inflates the bladder to 40 psi and it lifts to release the clamp. Pawling's fabric reinforced EPDM bladder is rated at 100,000 cycles, or about 50 years of service, much longer than the presses rated life. The bladder is only secured at the ends. Friction with the clamp keeps it in place along the length of the roller.

Sponsored Recommendations

The entire spectrum of drive technology

June 5, 2024
Read exciting stories about all aspects of maxon drive technology in our magazine.


May 15, 2024
Production equipment is expensive and needs to be protected against input abnormalities such as voltage, current, frequency, and phase to stay online and in operation for the ...

Solenoid Valve Mechanics: Understanding Force Balance Equations

May 13, 2024
When evaluating a solenoid valve for a particular application, it is important to ensure that the valve can both remain in state and transition between its de-energized and fully...

Solenoid Valve Basics: What They Are, What They Do, and How They Work

May 13, 2024
A solenoid valve is an electromechanical device used to control the flow of a liquid or gas. It is comprised of two features: a solenoid and a valve. The solenoid is an electric...

Voice your opinion!

To join the conversation, and become an exclusive member of Machine Design, create an account today!