Abstract: A screen pack replacing apparatus in accordance with the present invention is arranged such that a single slide bar having at least two or four screen packs is slidably provided in a main body disposed on a cylinder. As the slide bar is moved, the screen packs can be replaced, and the overall configuration can be made compact and the filtering area can be made large.

Abstract: A drive device for a two-shaft extruding machine whereby the directions of relative rotation of the two screw shafts of the machine can be rapidly changed without having to manually change a gear. The drive device includes a first shaft, a second shaft disposed coaxially with the first screw shaft and rotatable integrally therewith, a third shaft disposed coaxially with the intermediate shaft and rotatable integrally therewith, a first gear rotatable integrally with the first shaft, a second gear rotatable integrally with the second shaft and meshed with the first gear, a third gear rotatably supported on the third shaft and meshed with the first gear, and a fourth gear rotatable integrally with the second shaft and a fifth gear rotatably supported on the third shaft and meshed with the fourth gear. A claw clutch is provided for rotatably coupling a selected one of the third and fifth gear to the third shaft.