639 PSC – Pneumatic expanding shaft with leaves


The Model 639/PSC is recommended for unwinding or winding rolls with and without cores.
It can be used with multi-slits also for very narrow web widths. The body of the shaft is available in steel or aluminum, depending on the reel weight and the expansion leaves come in either steel or rubber covered depending upon core material and torque requirements. The journal ends are also available in a variety of steels and are always custom-made. Expansion is accomplished by one (or more) air activated pistons that mechanically engage the expandors. Expansion can be spring-activated so as to grant core is gripped also in case of air leakage in the machine. An automatic clamping device of the web can be fitted for a quicker and easier winding start to customer’s request.


Core diameter from-von 70 to-bis 500 mm
Face width from-von 800 to-bis 4000 mm
Expansion range 10/12 mm
Air pressure min. 5 bar (suggested 6 bar)

Contact your SVECOM representative for Non-Standard requirements.

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