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Air-Mechanical Expanding Shafts

Shafts that clamp pneumatic-mechanically combine the advantages of both mechanical and pneumatic shafts. They guarantee a 100% centrically-run roll and can also be clamped and relaxed pneumatically quickly and without effort.

WISTEC pneumatic-mechanical shafts for winding of metal foil. (picture 1)

The use of pneumatic-mechanical shafts can strongly improve the safety of a system. If the pneumatic is only in use to relax the system, then there is no danger to the quality of a product in the event of a failure concerning the auxiliary power. While operating, the roll is safely grabbed without the use of external energy as a result of spring tension (see drawing).


The absolutely centric clamping of pneumatic-mechanical shafts is necessary for clamping sensitive materials or at high speeds.

WISTEC pneumatic-mechanical shaft for internal core diameter 70 and 76 mm, overhung, for high winding quality in the label industry. (picture 2)


Special constructions of pneumatic-mechanical shafts are also used for coreless winding of spools. An absolutely centric run with all diameters is guaranteed.

WISTEC pneumatic-mechanical shaft with a nominal diameter of 35mm
Four centric expanding leaves allow the cross-wound spooling of a string; in the enlargement shown - the axially working clamp device (picture 3)

Pneumatic-mechanical adapters have even in narrow construction forms enough clamping force and still have the advantage of winding absolutely centric.

WISTEC pneumatic-mechanical adapter for 150 mm internal core diameter, five leaves. Every segment is operated by a separate cylinder. Internal diameter 65mm, width 40 mm (picture 4)

Specially constructed pneumatic-mechanical shafts can reach expansion ranges of more than 20% of the nominal diameter.

In the shown application is an expansion range of 200 to 240 mm necessary. For safety reasons, the leaves are arranged overlapping. (picture 5)