Apparatus for cutting

An apparatus for cutting a cylindrical sleeve (7) as the sleeve (7) is continuously displaced in its longitudinal direction, during continuous manufacture of the sleeve (7), the apparatus comprising:

• a longitudinal slide (30) which is displaceable synchronously with the sleeve (7) during rotation and movement of the sleeve in its longitudinal direction;
• a knife (36);
• a cross slide (39,43) having the knife (36) mounted thereon, the cross slide (39,43) being reciprocal transversely of the longitudinal direction of the sleeve (7), and thereby transversely of the direction of movement of the longitudinal slide (30), for impressing the knife (36) into the wall of the sleeve (7) during longitudinal displacement of the longitudinal slide (30) and the sleeve (7), for cutting a desired length of the sleeve (7), the cross slide (39,43) having a forward, knife-carrying section (43,44) and a rear section (39,40) guiding the reciprocal movement during the longitudinal displacement;
• a piston and cylinder assembly (41,42) interconnecting the cross slide sections (43, 44;
• 39,40) with one another, for fixing the mutual position of the sections and for disengaging the sections (39,40;
• 43,44) from one another after movement a predetermined distance in towards the longitudinal axis of the sleeve (7);
• a plurality of rails (37) having the cross slide sections (39,40;
• 43,44) mounted thereon for the movement transversely of the longitudinal axis of the sleeve (7);
• a plate member (52) having a guide groove (51) extending therealong, the guide groove over at least a part of its length being angled obliquely relative to the sleeve (7);
• and
• a guide pin (50) extending from the rear section (39,40) into the guide groove (51) to reciprocate in the guide groove (51) during movement of the longitudinal slide (30) synchronously with the sleeve (7) and back to its starting position.