An apparatus for removing wound sheet material (2) from a tubular core (1) comprises a support shaft (21); a circular blade (32) that has a bevel cutting edge (35), is configured to perform idle rotation movements (8) about an own rotation axis (36), and has an initial position (37) in which said cutting edge (35) is at an initial distance (Da) from said longitudinal axis (22); a control unit (90) in which values of the support shaft diameter (Φs) and of the initial distance, and that is configured to receive the value of the thickness (Tc) of the tubular core (1) at each work cycle, and to perform a step of cutting said sheet material (2) by automatically moving said circular blade (32), wherein said blade performs the cutting step of cutting said sheet material (2) by a plurality of forward and return longitudinal translatory movements (7f,7b) of said circular blade (32) in such a way that said cutting edge of said blade rolls on said sheet material and progressively cuts said sheet material until a current distance (D) of said cutting edge (35) becomes equal to a computed distance (Dc), the apparatus further comprising, in an axial reference position of said support shaft (21) at a predetermined distance from a first end (21 a) of said support shaft (21), a transverse abutment (23,24d) arranged to receive in abutment a first end (3a) of said coil (3); a push-and-lock device (55) of said coil (3) on said support shaft (21) for longitudinally locking said coil (3) at a second end (3b) of said coil (3) opposite to said first end (3a).
B65H 73/00 - Stripping waste material from cores or formers, e.g. to permit their re-use
B26D 1/18 - Cutting through work characterised by the nature or movement of the cutting memberApparatus or machines thereforCutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter rotating about a movable axis mounted on a movable carriage
B26D 5/00 - Arrangements for operating and controlling machines or devices for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
2.
AN IMPROVED APPARATUS FOR TRANSVERSALLY CUTTING TUBULAR BODIES
An apparatus (100) for transversally cutting a tubular body (1) of thickness (t) comprises a base frame (2) on which two parallel cylinders (10) are mounted horizontally and arranged to be rotatably actuated in a same rotation direction, thus forming a cradle (17) arranged to support and to rotate the tubular body (1). A cutting head (31) is arranged above the cradle (17), including a movable support (35) that is arranged to be brought closer to or further away from the cradle (17), and that supports a rotatable circular blade (32) arranged to cut the thickness (t) of the rotatable tubular body (1) while being brought closer to the cradle (17). In order to stabilise the tubular body (1) on the cradle (17), an idler accompanying or positioning roller (40) is arranged between the cradle (10) and the rotation axis (33) of the blade (32), said roller (40) rotatably mounted to an arm (42) that is movably connected to the movable support (35) via an elastic or constant-force member (44) in such a way that, when the cutting head (31) is lowered towards the cradle (17), the roller (40) comes into contact with the surface of the tubular body (1) and then remains in that position while the blade (32) continues to be lowered towards the tubular body (1) and finally attains and cuts the tubular body (1), moving to a position (B), in which the distance (D2) of the accompanying roller (40) from the cradle (17) is shorter than the distance (D2) of the blade (32) from the cradle (17) by a predetermined amount (d) that is at least equal to the thickness (t) of the tubular body (1).
Technical problem: a low sawing precision of tubular bodies of an apparatus comprising a transverse sawing station (30), in particular said apparatus equipped with a chip-forming saw means (35), a support (11′,11″) arranged to maintain the tubular bodies (1) in rotation during the sawing step, and also comprising a carriage means (50) for carrying the tubular body (1) along the direction of its own longitudinal axis (16) towards the sawing station (30), in particular preserving the possibility of removing chips produced during the sawing from the inside of the tubular body (1), such low sawing precision, in terms of length and smoothness of the end of the portions depending upon possible small longitudinal translation movements of the tubular body (1) along the support (11′,11″).
Solution: providing a carriage means (50) that comprises a holding means (14) for longitudinally holding the tubular body (1), the holding means (14) comprising a rotatable element (71) arranged to relatively rollingly engage with a surface portion (18) of the tubular body (1), in particular the rotatable element (71) is arranged to engage by rolling and pressing onto an inner surface portion (18) of said tubular body (1) proximate to said first end (5′) and radially corresponding to a surface portion of the tubular body (1) to contact a counter-support element (72) and radially corresponding to a surface portion of said tubular body (1) that is in contact with a counter-support element (72).
Machines and machine tools for the cutting and forming of materials; cutting machines for cardboard or plastic tubes; machines for connecting cut tubes
40 - Treatment of materials; recycling, air and water treatment,
Goods & Services
Machines and machine tools not belonging to other classes; cutting machines for cardboard or plastic tubes; machines for connecting cut tubes. Shelf structures for the industry. Prototype fabrication of new products and machines for others.
