TURBINE HOUSING FOR TURBOCHARGER

摘要

An apparatus for making bags from a continuously fed heat-sealable web comprises supporting bars for the web arranged on a rotary cylinder parallel to and at a spacing from one another. Means for transversely welding and separating the web comprise welding bars co-operating with backing bars. The backing bars are arranged between the supporting bars and are displaceable towards the welding bars. The supporting and backing bars are movable towards and away from one another in a zig-zag line during transference of the web passed therebetween. The supporting bars for receiving and holding the web are axially extensible and retractable at least over the width of the web. In the region of the cylinder sector in which the supporting bars are retracted and the separating weld seams are produced, the welding bars are guided to be concentric with the cylindrical enveloping surface swept by the backing bars, namely outside said enveloping surface and at the same angular speed.