Stacking device for hollow stackable objects on exit from a rotating high-speed production machine
The device serves for stacking hollow objects generally tapered and intended for accumulation in stacks where they are arranged, each one partially inserted in the next. The stacking device operates at the exit of a rotating machine ( 20 ) operating at high speed, and having a rotating head ( 21 ) for the single objects, and comprise an extractor means ( 30 ) located in an exit station (B) of the rotating machine ( 20 ) intended to remove the objects from the rotating head ( 21 ) one at a time. According to the invention, an intermediate stacking means ( 40 ) is foreseen, fed at its entry point with objects introduced by means of the extractor means ( 30 ) with a movement parallel to the axis (R) of the objects in question, said intermediate stacking means ( 40 ) being adapted to grip the objects in the position in which they are received from the extractor means ( 30 ) and to send them in a longitudinal direction parallel to their axis (R) and at such a speed that, in relation to the feeding speed of the objects in question at the entry, the objects are accumulated in a partial manner, while maintaining a distance that prevents any substantial contact between the side walls ( 11 ) of the objects.
1. Stacking device for hollow stackable objects, said objects being of a generally tapered form having an axis (R), and stacked so that one object is partially inserted inside the next along said axis (R), said stacking device operating at the exit of a rotating machine ( 20 ) operating at high speed and having a rotating head ( 21 ) having a plurality of chucks ( 23 ) each bearing at least one of the objects,
the stacking device comprising extractor apparatus ( 30 ) and an intermediate accumulator ( 40 ),
wherein said chucks, the axis (R) on each of the objects on the plurality of chucks or in the intermediate accumulator, and the intermediate accumulator ( 40 ) itself, are all located in a first plane,
whereas the extractor apparatus is formed by two opposing and spaced apart first gripping elements located in a second plane intersecting and extending in the longitudinal direction of the intermediate accumulator and perpendicular to the first plane, and operates along said second plane,
wherein the first gripping elements are located in an exit station (B) of the rotating machine ( 20 ) and grip and remove the objects between the elements from the rotating chucks ( 23 ) one at a time, and
wherein the intermediate accumulator ( 40 ) is fed at an entry thereof with objects introduced by the first gripping elements with a movement in the first plane in the longitudinal direction of the intermediate accumulator, and
wherein said intermediate accumulator ( 40 ) has second gripping elements in the first plane which partially extend longitudinally between the first gripping elements to grip the objects between the second gripping elements in the position in which they are received from the extracting apparatus ( 30 ) and move them in the longitudinal direction of the intermediate accumulator and the axis (R) of the objects engaged in the intermediate accumulator and at such a speed that, in relation to a speed at which the objects are fed into the entry by the extractor apparatus so that the objects are accumulated one within the other in a partial manner within said accumulator, maintaining a sufficient distance to prevent substantial contact between the side walls ( 11 ) of the objects when the objects are in a partially inserted configuration in the intermediate accumulator.
2. Device according to claim 1 , wherein said second gripping elements define a corridor ( 42 ) whose walls are mobile in continuous motion and grip the objects with a transversal thrust action, maintaining them in the position in which they were received from the extractor means ( 30 ).
3. Device according to claim 2 , wherein said second gripping elements comprise a pair of linear conveyor elements ( 41 ) opposite and parallel to each other which partially extend longitudinally between the first gripping elements, whose active sections ( 41 ′) run in the first plane longitudinally in a longitudinal path and define the two opposite walls of said corridor ( 42 ), and are positioned at a reciprocal distance such that each object can be inserted into the corridor ( 42 ) in contact with both such sections ( 41 ′) to grip the objects individually by means of opposite and transversal thrust action.
4. Device according to claim 3 , wherein said linear conveyor elements ( 41 ) each comprise at least a conveyor belt ( 411 ) longitudinal, elongated, to define a point of contact with the object.
5. Device according to claim 1 , further comprising a final accumulator ( 50 ) fed at its entry with objects moved by the intermediate accumulator ( 40 ), to send the objects in a longitudinal direction parallel to the axis (R) and at a speed slower than that of the intermediate accumulator ( 40 ) so that the objects already partially inserted inside each other, are compacted to penetrate even further.
6. Device according to claim 3 , characterised in that said linear conveyor elements ( 4 ) are arranged one on top of the other and that their speeds are different to provoke a rotation of the object on the vertical plane passing in the longitudinal axis (R) in order to recover any sliding made by the object in relation to the linear conveyor elements ( 41 ) that can change the axis of the objects in relation to the longitudinal axis (R) of the intermediate accumulator means ( 4 ).