Fosber Rotary Shear

Technical Features Max. cutting speed: Up to 650 fpm Waste expulsion speed: Up to 500 fpm Max. paper width: 98 - 110 in.

The Fosber Rotary Shear is composed of a cutting section and a waste expulsion section. Two cutting configurations are available: knife-to-knife and knife-to-anvil. The knife-to-knife configuration consists of two low inertia knife bars. The helical knife blades are mounted on these bars. The knife bars are driven through a zero backlash meshed gear loop fitted at both shaft ends on each head. The knife-to-anvil configuration is also composed of a pair of shafts. The upper shaft is a knife on which the helical serrated knife blade is mounted. The lower shaft is fitted with sectioned polyurethane sleeves which act as the anvil. The sleeves have a male to female lock design, allowing easy removal and replacement. The cut point on the anvil is automatically adjusted after each cut to extend the life of the polyurethane anvil. The knife-to-anvil configuration is also available in a V-drum version, which allows the shear to cut across the full width of the board or to cut small notches on the web edges for trim only. The V-Drum version is required for gapless order changes on single level knife operations. The waste expulsion section of the Rotary Shear consists of a pneumatically indexed diverter plate, an expulsion nip roll and a high-grip expulsion belt. Following the chop of the cutting section the diverter plate pivots into the board line, re-directing the waste board down into the nip roll and high-grip expulsion belt sections. This downward movement is also enhanced by a roller which drops down in synchronisation applying positive pressure to the waste board.