IT201600100151A1 - Machine for the production of box-like containers with bottom and / or lid composed of a plate-shaped base and a lateral surface defined by a strip or belt perimetrically connected to the plate-shaped base. - Google Patents

Description

Machine for the production of box-shaped containers with bottom and / or lid composed of a plate base and a lateral surface defined by a strip or belt connected perimeter to the plate base.

DESCRIPTION

The present invention relates to a machine for the production of box-shaped containers with a bottom and / or lid consisting of a plate base and a lateral surface defined by a strip or belt connected perimetrically to the plate base.

As is known, in recent years, the demand for box-shaped containers made of natural materials, such as paper or wood, has increased, particularly for the packaging of food products. The present invention relates in particular to the sector of the production of containers composed of a bottom and / or a lid each consisting of a base with a circular or polygonal or elliptical plan and a lateral surface made of a strip or belt which it develops on the perimeter from one face of the plate base and which is fixed to the plate base by means of metal stitching staples which are spaced apart along the corner joining the plate base to the lateral surface. These box-shaped containers are mainly made of wood and are used for the packaging of food products, in particular cheeses, having a conformation usually corresponding to that of the container.

Box-shaped containers of this kind are currently produced manually by an operator who positions the plate base and the belt on a support and then sews the plate base to the belt by means of a manually operated staple machine.

This manual production technique denotes various problems, including: low productivity, quality of the box-shaped containers dependent on the operator's expertise, tiring work for 1 <1> operator and high production costs.

Automatic machines for the production of these box-like containers are also known. These machines are equipped with automatic loading systems for the plate bases and belts and are equipped with several sewing heads according to the number of stitches to be applied to carry out the assembly of a belt to the plate base of the bottom or of the box container lid.

These machines are generally produced following specific requests from some manufacturers of box-shaped containers and are therefore practically not present on the market. Such machines have the problem of having a very low production flexibility since, generally, as they are designed, they can produce only one format of box-shaped containers. Furthermore, they are generally very noisy and require frequent maintenance which can stop the machine for long periods.

The main aim of the present invention is to solve the above problems, realizing a machine for the production of box-shaped containers with bottom and / or lid, composed of a plate base and a lateral surface defined by a strip or belt connected perimetrically to the plate base, capable of achieving high productivity and excellent reliability and operating precision.

Within this aim, an object of the invention is to provide a machine which has a low noisy operation.

Another object of the invention is to provide a machine capable of producing different formats of containers with modifications that are simple and quick to implement.

A further object of the invention is to provide a machine which requires reduced maintenance interventions.

Another object of the invention is to provide a fully automatic machine which requires very limited manual interventions and which guarantees high safety for the operators assigned to its operation.

This task, as well as these and other purposes which will appear better below, are achieved by a machine for the production of box-shaped containers with a bottom and / or lid composed of a plate base and a lateral surface defined by a strip or belt connected perimetrically. to the plate base, characterized by the fact of comprising at least one production unit comprising:

- a first group for loading plate bases onto a first conveyor;

- a second group for loading strips or belts onto a second conveyor;

- a table arranged horizontally and rotatable about a main vertical axis with respect to a main support structure;

- a plurality of substantially cylindrical matrices mounted on said table with their axes vertically and angularly spaced from each other around said main axis, said matrices being individually rotatable around their axes relative to said table;

- a first transfer station provided with first means for cyclical transfer of one of said plate bases from said first conveyor to the upper base of one of said matrices positioned in said first transfer station;

- a second transfer station provided with second means for cyclical transfer of one of said belts from said second conveyor to one of said matrices positioned in said second transfer station and with means for winding each belt around a relative matrix near the its upper base;

- at least one sewing station provided with sewing means for a belt and a plate base arranged on a same die positioned in said sewing station;

- a third transfer station provided with third means for cyclical transfer of a bottom or a lid, consisting of a plate base and a belt sewn together, from one of said matrices positioned in said third transfer station to a conveyor exit;

- means for intermittent rotation of said table about said main axis for the positioning, from time to time, of one of said dies in one of said stations;

- means for individual rotation of said matrices around the relative axis with respect to said table at least in correspondence with said second transfer station and said sewing station.

Further characteristics and advantages of the invention will become clearer from the description of a preferred but not exclusive embodiment of the machine according to the invention, illustrated, by way of non-limiting example, in the accompanying drawings, in which:

Figure 1 is a top plan view of the machine according to the invention, with some elements omitted for simplicity;

Figure 2 is a side elevation view of the machine according to the invention, with some elements omitted for simplicity;

Figure 3 is a perspective view of the machine according to the invention, with some elements omitted for simplicity;

Figures 4 to 6 schematically illustrate, in lateral elevation, the operation of the first group for loading bases with a plate on the first conveyor;

Figures 7 to 9 schematically illustrate, in lateral elevation, the operation of the second group for loading belts on the second conveyor;

Figures 10 and 11 schematically illustrate, in lateral elevation, the operation of the first transfer means of a plate base from the first conveyor to the upper base of a die, in the first transfer station;

Figures 12 to 14 schematically illustrate, in a top plan view, the operation of the second means for transferring a belt from the second conveyor to a matrix in the second transfer station;

Figures 15 and 16 schematically illustrate, in lateral elevation, the operation of the second transfer means in the operating conditions corresponding to Figures 12 and 14; Figures 17 to 19 schematically illustrate, in a partially sectioned and enlarged top plan view, the winding of a belt around a matrix in the second transfer station; Figure 20 illustrates the operating condition of Figure 19 in lateral elevation; Figure 21 schematically illustrates, in a partially sectioned and enlarged top plan view, the completion of wrapping a belt around a matrix in the second transfer station;

Figure 22 illustrates the operating condition of Figure 21 in lateral elevation; Figure 23 schematically illustrates, in lateral elevation, the sewing of a plate base and of a belt in the sewing station;

Figure 24 schematically illustrates, in a partially sectioned top plan view, the operating condition of Figure 23;

Figure 25 schematically illustrates the operation of the third means for transferring a bottom or a lid from a matrix to the outlet conveyor, in a side view;

Figure 26 illustrates the operating condition illustrated in Figure 25, in an enlarged top plan view;

Figure 27 illustrates an enlarged detail of Figure 3;

Figure 28 illustrates an enlarged detail of Figure 1;

Figure 29 illustrates, in a partially sectioned side view, the sewing station; Figures 30 to 35 show a matrix, axially sectioned and enlarged, under various operating conditions;

Figures 36 to 38 show an example of a box-shaped container, consisting of a bottom and a lid, which can be produced with the machine according to the invention, more particularly:

Figure 36 is an exploded perspective view of the container;

Figure 37 illustrates the container in perspective view with the bottom coupled with the lid;

Figure 38 illustrates the container in axial section.

With reference to the aforementioned figures, the machine according to the invention, generally indicated by the reference number 1, comprises at least an operating unit A, B capable of producing bottoms 81a or lids 81b of box-shaped containers 80.

Figures 36 to 38 show an example of a box-shaped container 80 which can be manufactured with the machine according to the invention. This box-shaped container 80 consists of a bottom 8a and a lid 81b each consisting of a plate base 82 and a lateral surface defined by a strip or belt 83 which is joined to the plate base 82 at the perimeter of the latter. and which develops from one face of the same plate base 82. The strip or belt 83 is joined to the plate base 82 by means of angled metal stitches 84, which are arranged along the corner joining the plate base 82 to the strip or belt 83 and which are spaced apart along this edge. The lid 81b is practically the same as the bottom 81a, but the diameter of its plate base 82 is slightly greater than that of the plate base 82 of the bottom 81a, so that the bottom 81a can be inserted into the lid 81b.

The box-shaped box-shaped container 80, illustrated in Figures 36 to 38, is shown purely by way of example since, as will become clearer below, the machine according to the invention is capable of producing box-shaped containers, as well as having a cylindrical shape as illustrated, also with other conformations, in particular with a prismatic conformation, for example with a square, hexagonal, octagonal, or cylindrical base with an elliptical base.

In the embodiment illustrated, the machine according to the invention comprises two twin production units, arranged laterally, one 311 'other and indicated respectively with the letters A and B: a production unit A for the production of the bottoms 81a and a production unit B for the production of lids 81b of box-shaped containers 80.

The machine in question preferably also comprises a coupling unit C which is fed with the bottoms 81a and with the lids 81b at the outlet of the two twin production units A and B and which couples, from time to time, a bottom 8a with a lid 81b so as to form, when required, a box-shaped container 80 complete with bottom 81a and lid 81b.

Since the two production units A, B are substantially identical to each other, for simplicity of description, only the production unit A will be described below, for the production of bottoms 81a, it being understood that what is described for the production unit A also applies to the other production unit B whose elements, in the drawings, have been marked with the same reference numbers as production unit A.

The production unit A comprises: a first group 2 for loading plate bases 82 onto a first conveyor 3 and a second group 4 for loading strips or belts 83, hereinafter simply "belts", onto a second conveyor 5.

The machine also comprises a table 6, substantially flat, which is arranged horizontally and which is supported, in a rotatable manner around a vertical main axis 7, by a main support structure 8 which is provided with feet resting on the ground.

On the table 6, which preferably has a circular plan and whose axis coincides with the main axis 7, there is arranged a plurality of matrices 9, preferably four or five in number, which are substantially cylindrical or prismatic and which are oriented with the their axes vertically, i.e. parallel to the main axis 7. These matrices 9 are angularly spaced from each other around the main axis 7 and have a conformation related to the conformation that is desired for the box-shaped container 80 to be produced. More particularly, these matrices 9 may have circular or polygonal bases, for example square, hexagonal, octagonal, or elliptical, depending on whether cylinders with a circular base are to be produced, or prism containers, for example with a square, hexagonal base, octagonal, or cylinder with elliptical base, etc. The plate bases 82 used for the production of these containers will have a conformation corresponding to the conformation of the upper base of the matrices 9.

Several processing stations are defined around the table 6, in correspondence with each of which the operations necessary for the production of the box-shaped containers 80 that the machine will have to produce are carried out automatically. More particularly, around the table 6 there are provided, in areas which are angularly spaced apart from each other around the main axis 7: a first transfer station 10, a second transfer station 11, at least one sewing station 12 and a third transfer station. transfer 13.

In the first transfer station 10, first means 14 are arranged for cyclical transfer of one of the plate bases 82 from the first conveyor 3 to the upper base of one of the matrices 9 when this is positioned in the first transfer station 10.

In the second transfer station 11, second means 15 are arranged for cyclical transfer of one of the belts 83 from the second conveyor 5 to one of the matrices 9 when this is positioned in the second transfer station 11, and means 16 for winding each belt 83 around to a relative matrix 9 in proximity to its upper base.

In the sewing station 12 there are arranged sewing means 17 of a belt 83 and of a plate base 82 between them, arranged on the same matrix 9, when this is positioned in the sewing station 12.

In the third transfer station 13, third cyclic transfer means 18 are provided for a bottom 81a or a lid 81b, consisting of the sewing assembly of a plate base 82 with a belt 83, from one of the matrices 9, when this it is positioned in the third transfer station 13, to an outlet conveyor 19.

The machine in question is provided with means for intermittent rotation of the table 6 around the main axis 7 according to angles of constant predetermined amplitude in such a way as to position, from time to time, one of the dies 9 in one of the aforementioned stations and rotation means. individual of the matrices 9 around the relative axes 9a with respect to the table 6 at least in correspondence with the second transfer station 11 and the sewing station 12, respectively first individual rotation means 21 and second individual rotation means 66, as will become clearer hereinafter.

More particularly, the table 6 is supported, rotatably about its axis which coincides with the main axis 7, by the main support structure 8 and the intermittent rotation means of the table 6 comprise a main gearmotor, not shown, whose shaft output 54 is connected, through a chain transmission 53, to a toothed crown 52 which is fixed below and coaxially to the table 6.

The first loading unit 2, schematically illustrated in Figures 4 to 6, comprises a magazine 22 of plate bases 82 stacked substantially vertically or slightly inclined with respect to the vertical, and first loading means 23 which can be operated to cyclically operate the gripping of the plate base 82 located at the lower end of the stack and its deposition on the first conveyor 3. The magazine 22 consists of guides 24 vertical or slightly inclined with respect to the vertical between which the stacked plate bases 82 are arranged. At the lower end of the stack of plate bases 82 there are provided, in a per se known manner, yielding supports, not shown, which hold the plate base 82 located at the lower end of the stack near its perimeter areas in such a way as to support the entire stack of plate bases 82.

The first loading means 23 comprise a suction cup 25 which is movable on command, for example by the action of a fluid-dynamic cylinder 26, to cyclically operate the gripping of the plate base 82 located at the lower end of the stack of plate bases 82 in the magazine 22 and to operate its disengagement cyclically, exploiting its deformability and the yielding of the supports of the stack, from the warehouse 22 and its transfer to the first conveyor 3.

The first conveyor 3 is constituted by a trailed conveyor, one end of which is placed below the plate base magazine 82. The traverses 3a of this conveyor 3 are regularly spaced apart along the length of the same conveyor 3 and are connected to a pair of parallel chains or belts which are placed side by side at a distance from each other sufficient to allow the passage of the suction cup 25 of the first loading means 23. The arrival end of the first conveyor 3 is arranged near the first transfer station 10. The first conveyor 3 is operated with intermittent motion in such a way as to position each time, the space between two successive tows 3a below the magazine 22 of plate bases 82 so as to receive, by the action of the suction cup 25, a plate base 82 and a plate base 82 to be cyclically positioned in proximity to the first transfer station 10.

The first transfer means 14, schematically illustrated in particular in Figures 10 and 11, comprise an arm 27 which is arranged horizontally and which is supported, in a rotatable manner about a vertical axis of rotation 28 which passes in an intermediate zone of its extension longitudinal, from the main support structure 8. This arm 27 is also movable along the same rotation axis 28 so that it can be raised and lowered on command. The arm 27 has, near its longitudinal ends, two suction cups 29 and 30 which are equidistant from the rotation axis 28 and which can be connected on command to a suction duct, not shown for simplicity. The arm 27 is rotatable with an intermittent motion around the rotation axis 28 according to angles of 180 ° in such a way as to position itself, each time, with a suction cup 29 or 30 above a plate base 82 carried each time , at the arrival end of the first conveyor 3 and with the other sucker 30 or 29 above a matrix 9 which is positioned, each time, at the first transfer station 10. In practice, when a plate base 82 reaches the first transfer station 10, the arm 27 is lowered and the suction cup 29 or 30 located above the first conveyor 3 is activated in such a way as to take the plate base 82 below. By the subsequent lifting and rotation of the arm 27 according to an angle of 180 ° (figure 10), followed by a lowering, the plate base 82, previously picked up by the first conveyor 3, is positioned on the upper base of the matrix 9 which is located in correspondence with the first transfer station 10, while the other sucker 30 or 29 engages with another plate base 82 which has in the meantime reached the end of arrival of the first conveyor 3 (Figure 11).

The second group 4 for loading belts 83, illustrated schematically in Figures 7 to 9, comprises: a magazine 31 of stacked belts 83 and second loading means 32 which can be operated to grip the belt 83 located at the lower end of the belt. stack and its deposition on the second conveyor 5.

The magazine 31 for the belts 83 consists of guides 33 vertical or inclined with respect to the vertical between which the belts 83 are stacked and rest on a pair of idle rollers 34.

The second loading means 32 comprise a suction nozzle 35, which can be connected, in a per se known manner, to a suction duct, and which can be engaged cyclically with an end portion of the belt 83 located at the lower end of the stack. of belts 83 in the magazine 31. The second loading means 32 further comprise gripping means which are engageable with this end portion of the belt 83 and which can be operated to extract the belt 83 from the stack of belts 83 sideways and its positioning on the second conveyor 5. More particularly, the suction nozzle 35 can be engaged with an end portion of the belt 83 located on one side of the pair of idle rollers 34 (Figure 7) and is movable on command downwards in a such as to cause the detachment of this end portion of the belt 83 located at the lower end of the stack of belts 83 from the belts 83 above, bringing this p end portion at the top in contact with a roller 36, arranged with its axis transversely to the longitudinal extension of the belt 83 (Figure 8). The aforementioned gripping means comprise this roller 36, a contact roller 37 and a pair of counter-rotating rollers 38. The roller 36 can be operated with a rotary motion around its axis and the contact roller 37, which is arranged above the roller 36 , is movable towards the roller 36 to increase the contact of the end portion of the belt 83 against the roller 36. Following this contact and the actuation with rotary motion of the roller 36, the belt 83 located at the lower end of the stack of belts 83 is extracted laterally and passed through the pair of counter-rotating rollers 38 which complete the extraction of the belt 83 from the belt magazine 83 and convey it onto the second conveyor 5 (Figure 9). Said second conveyor 5 is also constituted by a trailed conveyor which is arranged with one of its ends laterally to the magazine 31 and which is operated with an intermittent feed motion in such a way as to position, from time to time, the space between two successive towing 5a in correspondence with the extraction zone of the belt 83 from the magazine 31 of stacked belts 83. In this way, the belt 83 extracted from the magazine 31 is placed on the second conveyor 5 between two successive hauls 5a.

The other end of the second conveyor 5 is arranged in correspondence with the second transfer station 11 in such a way that the advancement with intermittent motion of the second conveyor 5 leads, from time to time, a belt 83 to be positioned in the second transfer station 11.

The second transfer means 15, arranged in the second transfer station 11, schematically illustrated in particular in Figures 12 to 15, comprise an arm 39, arranged in a substantially horizontal plane, which is supported, around a relative axis of rotation 40 vertical positioned near one of its longitudinal ends, from the main support structure 8. This arm 39 is provided, near its opposite end with respect to the rotation axis 40, with a gripper 41, for example a pneumatically operated gripper, which can be engaged cyclically with an end portion of the belt 83 arranged on the second conveyor 5 The arm 39 is rotatable about the relative axis of rotation 40 to cyclically bring a belt 83 to face with this end portion the lateral surface of one of the matrices 9 which is positioned in the second transfer station 11.

Conveniently, in the second transfer station 11 there are disposed means 42 for dispensing an adhesive on the end portion of the belt 83, in proximity to the area which is gripped by the gripper 41, before the arm 39 removes it from the second conveyor 5. More particularly , these glue dispensing means 42 consist of at least one nozzle 43 which is supported by the main support structure 8 and which is oriented towards the aforementioned end zone of the belt 83 in a zone which is close to but which does not coincide with the zone which is affected by the gripper 41.

The winding means 16 comprise: a first stop finger 44 which is stably located in the second transfer station 11, the first individual rotation means 21 of the matrix 9, arranged in the second transfer station 11, around its axis relative to the table 6 and a second stop finger 45 which is mounted on each of the matrices 9 and which can be actuated on command to clamp the two opposite ends of the belt 83, which are mutually superimposed at the end of the winding, against the lateral surface of the matrix 9 arranged in the second transfer station 11.

More specifically, at the second transfer station 11, the main support structure 8 supports, in a rotatable manner around its vertically arranged axis 46a, a shaft 46 which has, at its lower end, an upper plug 47. L The shaft 46 is movable vertically with respect to the main support structure 8 in such a way as to engage the upper pad 47 against the plate base 82 resting on the upper base of the matrix 9 positioned in the second transfer station 11. This shaft 46 also supports the first stop finger 44 which is movable on command along a radial direction with respect to the axis 46a of the shaft 46 which coincides with the axis 9a of the die 9 which is located in correspondence with the second transfer station 11. The actuation of the first finger stop 44 can be implemented in a per se known manner, for example by means of a first abutment 48 provided at the second stage transfer unit 11 which acts on command on a first slide 49, which carries the first stop finger 44 and which is mounted on the upper pad 47. This first slide 49 is integral with the shaft 46 and the upper pad 47 in rotation around the axis 46a.

The first individual rotation means 21 of the matrix 9 at the second transfer station 11 comprise a first additional toothed wheel 50 which meshes with a corresponding toothed wheel 51 carried by each of the matrices 9.

More particularly, below the table 6, a main toothed crown 55 is arranged, with an axis coinciding with the main axis 7, which is fixed to the main support structure 8 and which, therefore, remains fixed during the rotation of the table 6 around the 'main axis 7.

Each matrix 9, is fixed coaxially to the upper end of a sleeve 56 which is supported, in a rotatable way about its axis, by a collar 57 which is fixed to the upper face of the table 6. This sleeve 56 is connected coaxially, so integral in rotation around its axis, to the toothed wheel 51 which meshes with the main toothed crown 55.

Following this coupling, during the rotation of the table 6 around the main axis 7, the dies 9 rotate around their respective axes 9a relative to the table 6. The coupling of the toothed wheel 51 of each die 9 with the main toothed crown 55 guarantees a precise and predetermined angular positioning of each matrix 9 around the relative axis 9a at the various stations in which they are positioned by rotating the table 6 around the main axis 7.

At the second transfer station 11, where a belt 83 is wound around the lateral surface of a matrix 9, it is necessary to perform a complete rotation of the matrix 9 around its axis. For this reason, at the second transfer station 11, the main toothed crown 55 has a recess 55a, devoid of teeth, in such a way as to leave the matrix 9 free to rotate around its axis 9a. In correspondence with this notch 55a, below the main toothed crown 55, the first additional toothed wheel 50 is provided, with toothing having the same module as the toothing of the main toothed crown 55, with which the toothed wheel 51 of the matrix 9 engages when this arrives at the second transfer station 11. The first supplementary toothed wheel 50 is connected to a drive motor, of a known type and not shown for simplicity, capable of precisely controlling the rotation of its output shaft, which is operable to cause the rotation of the first supplementary toothed wheel 50 about its axis and therefore the rotation of the matrix 9 about its axis 9a relative to the table 6 according to an angle of predetermined amplitude and such as to obtain the complete winding of a belt 83 around the lateral surface of the matrix 9.

It should be noted that each belt 83 has a length which is slightly greater than the circumferential development of the lateral surface of the matrix 9 on which it is to be wound. For this reason, at the end of the wrapping, one end of the belt 83 overlaps the opposite end of the belt 83, precisely in the area on which the glue has been sprayed.

The second stop finger 45 is mounted on a second slide 58, also horizontal, which is supported, in a sliding manner, by the relative die 9 along a radial direction with respect to the axis of the die 9. The second stop finger 45 is it rises vertically from this second slide 58 and faces the lateral surface of the matrix 9. By sliding the second slide 58 along a radial direction with respect to the matrix 9, it is possible to move the second stop finger 45 towards or away from the lateral surface of the matrix 9 .

The second stop finger 45 is movable on command from an engagement position, in which it engages the belt 83 wrapped around the lateral surface of the relative matrix 9, to a first disengagement position, in which it is moved away from the lateral surface of the relative matrix 9 to an extent sufficient to disengage the belt 83 wrapped around the relative matrix 9, and to a second disengagement position, in which it is moved away from the lateral surface of the relative matrix 9 to a greater extent than the first disengagement position and such as to allow the passage of the first stop finger 44 between the second stop finger 45 and the lateral surface of the relative matrix 9.

More particularly, inside the sleeve 56 there is coaxially arranged a shaft 59 sliding axially relative to the sleeve 56. This shaft 59 protrudes from the lower part of the sleeve 56 and is engageable with a lifting and lowering cam 60 which is fixed to a plane of the support structure 8 located below the table 6. The shaft 59 is connected to the second slide 58 through a biscuit lever 61. In practice, as illustrated in particular in the sequence of Figures 30 to 33, the engagement of the lower end of the shaft 59 against the rising portion 60a of the cam 60 causes the shaft 59 itself to be raised with respect to the sleeve 56 and therefore the rotation of the biscuit lever 61 which, acting against the second slide 58, causes the second stop finger 45 to move away from the lateral surface of the matrix 9 bringing it from the engagement position (Figure 30) to the first disengagement position (Figures 31 and 32). The engagement of the lower end of the shaft 59 with a descent portion 60b of the cam 60 causes the lowering of the shaft 59 and therefore the reverse rotation of the biscuit lever 61 with consequent return, for example due to the effect of means elastic bands, not shown for simplicity, of the second stop finger 45 in the engagement position, ie against the belt 83 wound on the lateral surface of the matrix 9 or against the lateral surface of the matrix 9 if the belt 83 is absent (Figure 33).

The second slide 58, as illustrated in Figures 34 and 35, in addition to the axial movement of the shaft 59, can also be moved by means of a second abutment 62 provided at the second transfer station 11 and engageable with the second slide 58 similarly to what happens with the first stop 48 for the first slide 4 9 which carries the first stop finger 44.

The displacement of the second stop finger 45 away from the lateral surface of the matrix 9 obtained by means of the second abutment 62 (figure 35) at the second transfer station 11 is greater than the displacement obtainable by engaging the shaft 59 on the cam 60 and brings the second stop finger 45 into the second disengagement position, in which it allows the first stop finger 4 4 to pass between the second stop finger 45 and the lateral surface of the matrix 9 to obtain the complete winding of a belt 83 around the lateral surface of the matrix 9 located in the second transfer station 11.

The return of the second stop finger 45 to the engagement position is obtained by means of elastic means, of a known type and not shown, when the action of the second stop 62 ceases (Figure 34).

It should be noted that the second slide 58 carrying the second stop finger 45, following its radial motion with respect to the die 9, can be engaged or disengaged with a seat 63 defined in the sleeve 56. When the second slide 58 is engaged with this seat 63 is integral, in the rotation around the axis 9a, with the sleeve 56 and therefore with the relative die 9, while when it is disengaged from this seat 63 it is released from the rotation of the sleeve 56 and therefore of the die 9 around the axis 9a . The displacement of the second slide 58 caused by the lifting of the shaft 59, that is the displacement that causes the passage of the second stop finger 45 into the first disengagement position, is such as not to disengage the second slide 58 from the seat 63 of the sleeve 56. In this condition, the second slide 58 and therefore the second stop finger 45 are integral with the relative matrix 9 in rotation around the axis 9a.

The displacement of the second slide 58 caused by the second stop 62, ie the displacement that causes the passage of the second stop finger 45 into the second disengagement position, is such as to disengage the second slide 58 from the seat 63 of the sleeve 56. In this condition, the second slide 58 and therefore the second stop finger 45 are released from the rotation of the relative die around the axis 9a.

In the second transfer station 11 there is also provided a lateral pad 64 which is stationary with respect to the rotational motion of the matrix 9 around its axis 9a and which is movable upon command towards and away from the lateral surface of the matrix 9. This pad side 64 is carried by an arm 65 which is supported by the main support structure 8 and which is movable, in a per se known way, for example by the action of a mechanical or pneumatic type actuator, moving towards and away from the matrix 9 in the second transfer station 11.

In practice, as illustrated in the sequence of figures 15 to 22, when a matrix 9, following the rotation of the table 6 around its axis, arrives at the second transfer station 11, its toothed wheel 51 arriving at of the notch 55a, disengages from the main toothed crown 55 and engages with the first additional toothed wheel 50. Upon arrival of the die 9 in the second transfer station 11, the upper pad 47 is lowered so as to press the plate base 82 , previously arranged on the die 9, against the upper base of the same die 9 while the first stop finger 44 is moved away from the lateral surface of the die 9 and the second stop finger 45 is brought, by means of the second stop 62, into the second position of disengagement, in which it is released from the matrix 9 as regards the rotation of the latter about its axis 9a relative to the table 6 (figures 15 and 17 ). In this condition, the end of a belt 83 is carried against the lateral surface of the matrix 9, positioned in correspondence with this second transfer station 11, by the movement of the arm 39 which has taken this belt 83 from the second conveyor 5.

The end of the belt 83 close to the matrix 9 is clamped against the lateral surface of the same matrix 9 by approaching the first stop finger 44 caused by the first abutment 48 (Figures 16 and 18). The first additional toothed wheel 50 is then driven with a rotary motion causing the matrix 9 to rotate around its axis 9a and the upper pad 47, with the first stop finger 44 engaged with the belt 83, rotates integrally with the matrix 9. As soon as once this rotation has begun, the lateral pad 64 is brought against the matrix 9 in correspondence with the area occupied by the belt 83 which is winding on it following this rotation (Figures 19 and 20). An intermediate phase of wrapping the belt 83 around the matrix 9 in the second transfer station 11 is also schematically illustrated in Figure 14.

When the matrix 9 has performed a complete rotation around its axis 9a relative to the table 6, the belt 83 is completely wrapped around the matrix 9 and its final end is superimposed on the initial end with the glue interposed.

It should be noted that, during the rotation of the die 9 around its axis 9a, the second stop finger 45 is in the second disengagement position in such a way as to allow the passage of the first stop finger 44 which has clamped the initial end of the belt 83 near the area occupied by the glue and which rotates together with the matrix 9.

At the end of the wrapping of the belt 83 around the matrix 9, by moving the second stop 62, the second stop finger 45 is brought into the engagement position by clamping the overlapping ends of the belt 83 against the lateral surface of the matrix 9 (figures 21 and 22). The first stop finger 44, by moving the first stop 48, is brought into the disengagement position, that is, moved away from the lateral surface of the matrix 9. It should be noted that the passage of the second stop finger 45 in the engagement position makes the second stop finger 45 integral with the matrix 9 in rotation around its axis, as explained above.

The upper pad 47 is then raised and the table 6 is rotated around the main axis 7 in such a way as to position a new die 9 at the second transfer station 11.

In the sewing station 12, the second individual rotation means 66 of the matrix 9 are arranged around its axis 9a relative to the table 6 with intermittent motion synchronized with the operation of the sewing means 17 in such a way as to sew the base to each other. plate 82 and belt 83, which are arranged on the matrix 9 positioned in the sewing station 12, by means of sewing points 84 which are angularly spaced from each other around the axis 9a of the matrix 9.

More specifically, in order to allow individual rotation of the matrix 9 arranged in the sewing station 12 around its axis 9a relative to the table 6, also in correspondence with the sewing station 12 the main toothed ring 55 has a recess 55b without teeth and, in corresponding to this notch 55b, below the main toothed crown 55, there is a second supplementary toothed wheel 67, with toothing having the same module as the toothing of the main toothed crown 55, which is engaged by the toothed wheel 51 of the matrix 9, as schematically illustrated in figures 23 and 24, and which can be operated with an intermittent rotary motion.

The sewing means 17, illustrated in particular in Figure 29, comprise a sewing head 68 of a known type capable of performing seams with corner stitches 84. More particularly, the sewing head 68 has its own support structure 69 which is associated, in an adjustable manner, to the main support structure 8 at the sewing station 12. The support structure 69 of the sewing head 68 supports a part movable 70 which slidably houses a hammer 71 which can be operated to cyclically cut a metal wire 72, form a stitch and expel it from one end of the movable part 70 which faces a area of the corner, located between the upper base and the lateral surface, of the matrix 9 positioned in correspondence with the sewing station 12. The movable part 70 of the sewing head 68 is movable on command towards and away from the matrix 9 arranged in at the sewing station 12. The metallic thread 72, coming from a bobbin 73, is fed to the sewing head 68 by means of a a pair of counter-rotating rollers 74, 75 between which it is made to pass.

The movement of the movable part 70, of the hammer 71 and the actuation of the counter-rotating rollers 74, 75 is derived, by means of connecting rod-crank systems 76 of a known type which are not described in detail for simplicity, from a single shaft 77 which is driven with rotary motion around its axis.

Inside each matrix 9, in correspondence with the areas which are intended to face, from time to time, the sewing head 68 to receive a stitch 84, there are rivets 78 which can be operated to perform the riveting of the stitches. of stitching 84 when these are driven into the plate base 82 and into the belt 83 arranged on the matrix 9.

These riveting devices 78 have an arched conformation and are housed, in a sliding manner, inside arched seats 79 which are defined inside the body of each die 9 and which are angularly spaced from each other around the axis 9a of the relative die. 9 corresponding to the amplitude of the angle of rotation which is imposed on the matrix 9 around its axis between the application of two contiguous stitches 84. In this way, the intermittent rotation of the matrix 9 around its axis 9a relative to the table 6, at the sewing station 12, each time positions a clincher 78 at the sewing head 68.

Each clincher 78 has an upper end which is located near the edge between the upper base and the lateral surface of the matrix 9 and a lower end which is located in correspondence with an access slot 90 to the relative arched seat 79 defined on the surface side of the die 9. Each riveting device 78 is movable along the relative arched seat 79 to act, by means of its upper end, on the stitching point 84 which is driven into the plate base 82 and into the belt 83 in such a way as to effect its riveting . The movement of the clincher 78 along the relative arched seat 79 is caused by a punch 91 which is carried by the sewing head 68 and which faces the lateral surface of the matrix 9, positioned in correspondence with the sewing station 12, at the level of the slots 90 This punch 91 is operated by a cam 92 which is keyed on the shaft 77 which causes the operation of the whole sewing head 68. In practice, when the sewing head 68 drives a stitch 84 into the plate base 82 and into the belt 83 arranged on the die 9, the punch 91 penetrates into the slot 90 and acts on the lower end of the clincher 78 which faces the punch 91 causing the upward movement of the clincher 78 which, in this way, effects the riveting of the stitching point 84 applied. The intermittent rotation of the die 9 around its axis in the sewing station 12, carried out by the second additional toothed wheel 67, causes the positioning, from time to time, of a slot 90 in correspondence with the punch 91. The precision in positioning a slot 90 at the punch 91 is ensured by controlling the rotation of the second supplementary toothed wheel 67 during the sewing operation. It should be noted that the rotational position of the matrix 9 around its axis 9a is never free, but is constantly constrained to ensure correct positioning of the matrix 9 at least in correspondence with the second transfer station 11 and the sewing station 12 following the The meshing of the toothed wheel 51 of each matrix 9 with the main toothed crown 55 and of the control of the rotation of the additional toothed wheels 50 and 67 where the meshing of the toothed wheel 51 with the main toothed crown 55 fails.

Also in correspondence with the sewing station 12, an upper pad 93 is arranged which is movable on command along a vertical axis which coincides with the axis 9a of the matrix 9 positioned in the sewing station 12, so as to engage or disengage the base. plate 82 placed on the upper base of the matrix 9 positioned in the sewing station 12. The function of this upper pad 93 is to keep the plate base 82 as still as possible during the sewing operation.

Conveniently, each matrix 9 is provided, at its upper base, with a suction cup 94 to hold a plate base 82 when this is deposited by the first loading means 23 on the matrix 9.

Furthermore, each matrix 9 is provided with means 95 for disengaging the bottom 81a or lid 81b after sewing the belt 83 to the plate base 82.

Said disengagement means 95 comprise an annular body 96 which is arranged coaxially to the matrix 9, on its lateral surface, below the area which is occupied or can be occupied by the belt 83. This annular body 96 is axially movable upwards with respect to the remaining part of the relative matrix 9 to engage against the lower edge of the belt 83 and push the bottom 81a or cover 81b upwards. These disengagement means 95 can be activated in proximity to the third transfer station 13.

More particularly, the annular body 96 is connected to the shaft 59 and is integral with it in the translation along its axis relative to the body of the die 9.

For the activation of the disengagement means 95 of the bottom 8a or lid 81b of the container near the third transfer station 13, a cam 60 is provided, as described above, applied to a horizontal plane fixed to the main support structure 8 and located below the table 6. Said cam 60 has an upward portion 60a immediately upstream of the third transfer station 13, and this rising portion 60a can be engaged by the lower end of shaft 59. The engagement of shaft 59 with this rising portion 60a causes, as already described above, the passage of the second stop finger 45 from the engagement position to the first disengagement position in which said second stop finger 45 disengages from the belt 83 placed on the lateral surface of the matrix 9 (figures 30 and 31) and then the lifting of the annular body 96 which, acting on the lower end of the belt 83 now disengaged from the second stop finger 45, the spin g and upward relative to the body of the matrix 9 facilitating the disengagement of the bottom 8aa or of the lid 81b from the matrix 9 (Figure 32). Downstream of the third transfer station 13, the cam has a descent portion 60b which again causes the annular body 96 to be lowered and the second stop finger 45 to pass into the engagement position (Figure 33).

The third transfer means 18, as schematically illustrated in Figures 25 and 26, comprise an arm 97 which is arranged substantially horizontally and which is rotatably supported about an axis of rotation 98 located in a median zone of the longitudinal extension of the arm 97. This arm 97 supports, near its longitudinal ends, two bellows suckers 99 which are equidistant from the rotation axis 98 and which can be connected on command to a suction duct. The arm 97 is rotatable about the rotation axis 98 and is movable on command along this rotation axis 98 in such a way as to raise and lower the bellows suction cups 99.

In practice, when a matrix 9, following the rotation of the table 6 around the main axis 7, reaches the third transfer station 13, the annular body 96 has already pushed the bottom 81a or lid 81b upwards to facilitate its disengagement from the die 9. In this condition, the arm 97, previously raised with one of the two bellows suction cups 99 positioned coaxially to the die 9 in the third transfer station 13, is lowered and the suction inside the this bellows sucker 99 in such a way as to engage the bellows sucker 99 with the plate base 82 of the bottom 81a or cover 81b. The arm 97 is then raised, in such a way as to complete the disengagement of the bottom 8a or lid 81b above the matrix 9, and is then rotated around the rotation axis 98 according to an angle substantially of 180 °, so as to bring the bottom 81a or lid 81b above the outlet conveyor 19. Subsequently, the arm 97 is lowered and the suction through the bellows sucker 99 is deactivated in such a way as to deposit the bottom 81a or lid 81b on the outlet conveyor 19 while the another bellows sucker 99 engages with another bottom 81a positioned in the meantime in correspondence with the third transfer station 13.

Advantageously, the machine according to the invention also comprises a coupling unit C, each time, of a bottom 8a with a lid 81b at the outlet of the two production units A and B.

Said coupling unit C comprises positioning means 100 to face, from time to time, with their open side, a bottom 81a of the box-shaped container 80, at the outlet from the production unit A, and lid 81b of the box-shaped container 80, at the outlet. from the other production unit B. Said positioning means 100, as illustrated in particular in Figures 27 and 28, comprise two twin conveyor belts 101a and 101b, which are placed side by side and which are each fed by one of the output conveyors 19 of the two production units A and B on which the bottoms 8a and the lids 81b are placed horizontally or with their plate base 82 horizontally.

Each of the conveyor belts 101a, 101b winds around a roller 102a, 102b with a horizontal axis, located at the arrival end of the output conveyor 19, and a roller 103a, 103b with a vertical axis. In this way, each of the conveyor belts 101a, 101b develops along a path that begins with a horizontal section and ends with a vertical section. In correspondence with the vertical section, a substantially vertical side 104a, 104b is arranged, which faces the relative conveyor belt 101a, 101b providing a lateral support to the bottom 8aa or cover 81b carried by the relative conveyor belt 101a, 101b at the end of the passage of the bottom 81a or lid 81b from horizontal to vertical position. Each conveyor 101a or 101b opens into a relative vertical guide 105a or 105b which faces another vertical guide 105b or 105a into which the other conveyor belt 101b or 101a leads. These vertical guides 105a, 105b feed a device 106, of a known type, which is not described in detail for simplicity, which performs the coupling of a bottom 81a, fed by a vertical guide 105a, with a cover 81b fed by the other guide vertical 105b.

The operation of the machine according to the invention is as follows.

The plate bases 82 are stacked inside the relative magazine 22 and the belts 83 are stacked inside the relative magazine 31.

From time to time, as already described, a plate base 82 is taken from the stack of plate bases 82 arranged in the magazine 22 and is conveyed to the first transfer station 10 where it is taken by one of the suction cups 29, 30 of the arm 27 and positioned on the upper base of a matrix 9 arranged in correspondence with this first transfer station 10.

Similarly, from time to time, as already described, a belt 83 is picked up from the stack of belts 83 arranged in the magazine 31 and is conveyed to the second transfer station 11 where it is picked up by the gripper 41 of the arm 39 near one of its longitudinal ends and positioned, with this longitudinal end, close to the lateral surface of a matrix 9, previously passed by the first transfer station 10 where it received the plate base 82, positioned at the second transfer station 11 following the intermittent rotary movement of table 6 around the main axis 7. When the die 9 reaches the second transfer station 11, the upper pad 47 is lowered onto the plate base 82 previously arranged on the upper base of the die 9. It should be noted that the gripper 41 of the arm 3 9 engages with an area end of the belt 83 which is spaced from the actual longitudinal end of the belt 83 in such a way that, between the gripper 41 and the longitudinal end of the belt 83 there remains an area on which the glue is sprayed by means of the nozzle 43. At the second transfer station 11, this longitudinal end, in the area between the gripper 41 and the glue, is gripped by the first stop finger 44, brought into the engagement position, which presses it against the lateral surface of the matrix 9, while the second stop finger 45 is brought into the second disengagement position. The matrix 9 is then actuated with a rotary motion around its axis 9a in such a way as to carry out the complete winding of the belt 83 around its lateral surface with the overlapping of the final end of the belt 83 to the initial end of the belt 83 on which it was applied the glue. These overlapping ends of the belt 83 are pressed by the second stop finger 45 which is brought into the engagement position. The first stop finger 44 is then disengaged from the belt 83 and the upper pad 47 is raised in such a way as to allow the subsequent rotation of the table 6 around the main axis 7 which makes the matrix 9 advance towards the sewing station 12 while the the subsequent matrix 9 is positioned at the second transfer station 11.

It should be noted that, in the illustrated embodiment, an intermediate station 20 is arranged between the second transfer station 11 and the sewing station 12. This intermediate station 20, which can be occupied by optional devices for carrying out further operations on the bottom 81a of the container to be produced, such as the affixing of prints or labels, may also be absent.

By further rotation of the table 6 around the main axis 7, the matrix 9 with the belt 83 wrapped is positioned at the sewing station 12 where the upper pad 93, present in this station, is lowered in such a way as to lock stably the plate base 82 on the upper base of the die 9. In the sewing station 12, the sewing head 68 is operated, in a synchronized way with the rotation of the die 9 around its axis relative to the table 6, so as to perform , as already described, the seam of the belt 83 with the plate base 82 by means of angled stitches 84.

Once the sewing is finished, the upper pad 93 is raised and the table 6 is rotated according to an angle of predetermined width, in such a way as to position the matrix 9, carrying the sewn bottom 81a or cover 81b, in correspondence with the third transfer station 13 where the arm 97 with the bellows suction cups 99 removes the bottom 81a or lid 81b, consisting of the assembly by sewing the plate base 82 with the belt 83, from the matrix 9 and its deposition on the outlet conveyor 19 It should be noted that the disengagement of the bottom 8a or lid 81b from the matrix 9 by the action of the arm 97 with the bellows suction cups 99 is facilitated by the lifting of the bottom 81a or lid 81b with respect to the relative matrix 9 operated by the annular body 96, as already described.

The outgoing products of the two production units A and B, consisting, from time to time, of a bottom 81a and a lid 81b, are conveyed by the relative output conveyor 19 to a relative conveyor belt 101a, 101b which operates the passage of the relative bottoms 81a or lids 81b from a position in which they are arranged with the plate base 82 horizontally, to a position in which they are arranged with the plate base 82 vertically. The pairs of products, where each pair consists of a bottom 81a and a lid 81b, are fed, through the vertical guides 105a, 105b, inside the device 106 which performs the coupling of a bottom 81a with a lid 81b and to unload them to the outside, for example on a conveyor.

It should be noted that, if the production of a container without a lid 81b is required, the machine can also be made with a single production unit, or only one of the two foreseen production units can be used.

It should also be noted that the machine according to the invention, by replacing the dies, can produce containers with a plate base of various shapes.

The machine was designed to make box-shaped containers 80 consisting of a bottom 8a and / or a lid 81b composed of a plate base 82 and a belt 83 in wood or paper, but it can also produce containers in other materials, depending on your needs.

It should be noted that the machine according to the invention may be provided, instead of a single sewing station, with several sewing stations arranged in succession, in each of which a part of the sewing stitches 84 is applied to perform the union of the plate base 82 at the belt 83 of each bottom 81a or lid 81b. In this way, the time required for the sewing operation is reduced and therefore the productivity of the machine is increased. Already in the illustrated embodiment, the intermediate station 20, located between the second transfer station 11 and the sewing station 12, can be realized as the sewing station 12 and used to perform a part of the sewing of the plate base 82 at the belt 83, stitching which is then completed in the next stitching station 12.

In practice it has been found that the machine according to the invention fully achieves the intended aim as it is capable of guaranteeing high productivity, excellent reliability and high operating precision, with minimal interventions by an operator.

The machine thus conceived is susceptible of numerous modifications and variations, all of which are within the scope of the inventive concept; moreover, all the details can be replaced by other technically equivalent elements.

In practice, the materials used, as well as the dimensions, may be any according to the requirements and to the state of the art.

Claims (21)

R I V E N D I C A Z I O N I 1. Machine for the production of box-shaped containers with bottom and / or lid composed of a base plate and a lateral surface defined by a strip or belt connected perimeter to the plate base, characterized by the fact of comprising at least one production unit ( A, B) comprising: - a first group for loading (2) of plate bases (82) onto a first conveyor (3); ~ a second loading assembly (4) of strips or belts (83) onto a second conveyor (5); - a table (6) arranged horizontally and rotatable about a main axis (7) vertical with respect to a main support structure (8); - a plurality of substantially cylindrical matrices (9) mounted on said table (6) with their axes (9a) vertically and angularly spaced from each other around said main axis (7), said matrices (9) being individually rotatable around their axes (9a) relative to said table (6); - a first transfer station (10) provided with first cyclic transfer means (14) of one of said plate bases (82) from said first conveyor (3) to the upper base of one of said dies (9) positioned in said first transfer station (10); - a second transfer station (11) provided with second cyclic transfer means (15) of one of said belts (83) from said second conveyor (5) to one of said matrices (9) positioned in said second transfer station ( 11) and winding means (16) of each belt (83) around a relative matrix (9) in proximity to its upper base; - at least one sewing station (12) provided with sewing means (17) of a belt (83) and of a plate base (82) arranged on the same die (9) positioned in said sewing station (12); - a third transfer station (13) provided with third cyclic transfer means (18) of a bottom (81a) or a lid (81b), consisting of a plate base (82) and a belt (83) sewn between them, from one of said dies (9) positioned in said third transfer station (13) to an outlet conveyor (19); - means of intermittent rotation (52, 53, 54) of said table (6) around said main axis (7) for the positioning, from time to time, of one of said dies (9) in one of said stations (10 , 11, 12, 13); - means for individual rotation (21, 66) of said matrices (9) around the relative axis with respect to said table (6) at least in correspondence with said second transfer station (11) and said sewing station (12). 2. Machine, according to claim 1, characterized in that said first loading assembly (2) of plate bases (82) comprises: - a magazine (22) of stacked plate bases (82); And - first loading means (23) operable to cyclically operate the gripping of the plate base (82) located at the lower end of the stack and its deposition on said first conveyor (3). 3. Machine, according to claims 1, characterized in that said second belt (83) loading assembly (4) comprises: - a warehouse of stacked belts (83); - second loading means (32) which can be operated to grip the belt (83) located at the lower end of the stack and place it on said second conveyor (5). 4. Machine, according to one or more of the preceding claims, characterized in that said first conveyor (3) and / or said second conveyor (5) are constituted by trailed conveyors which can be operated with intermittent feed motion to position cyclically respectively a plate base ( 82) in said first transfer station (10) and / or a belt (83) in said second transfer station (11). 5. Machine, according to one or more of the preceding claims, characterized by the fact that said first loading means (23) comprise a suction cup (25) that is movable with command to operate cyclically gripping the plate base (82) located at the lower end of the stack of plate bases (82) in said store (22) and its transfer from said store (22) of plate bases (82) to said first conveyor (3). 6. Machine, according to one or more of the preceding claims, characterized in that said second loading means (32) comprise: - a suction nozzle (35), which can be engaged cyclically with an end portion of the belt (83) located at the lower end of the stack of belts (83) in said belt magazine (31) (83) and movable on command to operate detaching said end portion of the belt (83) below said stack of belts (83); And - gripping means (36, 37, 38) of said end portion of the belt (83) which can be operated to extract the belt (83) sideways from the stack of belts (83) and place it on said second conveyor (5 ). 7. Machine, according to one or more of the preceding claims, characterized in that, in said second transfer station (11), there are disposed means (42) for dispensing an adhesive on said end portion of the belt (83). in vault passing through said second transfer station (11). 8. Machine, according to one or more of the preceding claims, characterized in that said second transfer means (15) comprise an arm (39) rotatable around a relative axis of rotation (40) vertical and provided, in proximity to one of its end, of a gripper (41) which can be engaged cyclically with an end portion of a belt (83) arranged on said second conveyor (5), said arm (39) being rotatable around its axis of rotation (40) to cyclically carry a belt (83) with said end portion facing the lateral surface of one of said matrices (9) positioned in said second transfer station (11). 9. Machine, according to one or more of the preceding claims, characterized in that said winding means (16) comprise: - a first stop finger (44) located in said second transfer station (11) and movable on command to cyclically clamp said end portion of a belt (83) against the lateral surface of one of said matrices (9) positioned in said second transfer station (11); - first individual rotation means (21) of the matrix (9) arranged in said second transfer station (11) around its axis relative to said table (6); - a second stop finger (45) mounted on each of said matrices (9) and operable on command to clamp the two opposite ends of the belt (83), mutually superimposed at the end of the winding, against the lateral surface of the matrix (9 ) arranged in said second transfer station (11). 10. Machine, according to one or more of the preceding claims, characterized in that said winding means (16) comprise a lateral pad (64) located in said second transfer station (11) and stationary with respect to the rotation motion of the die ( 9) around its axis (9a), said lateral pad (64) being operable to press the belt (83) against the lateral surface of the die (9) during the rotation of the die (9) around its axis (9a) which actuates wrapping the belt (83) around the matrix (9). 11. Machine according to one or more of the preceding claims, characterized in that, in said sewing station (12), second individual rotation means (66) of the matrix (9) are arranged around its axis (9a) relative to said table (6) with intermittent motion synchronized with the actuation of said sewing means (17) to sew together the plate base (82) and the belt (83) arranged on the die (9) positioned in said sewing station (12) with stitches (84) angularly spaced from each other around the axis (9a) of the matrix (9). 12. Machine, according to one or more of the preceding claims, characterized in that said matrices (9) are connected, in the rotation around the respective axes (9a), to the rotation of said table (6) around said main axis (7 ) to maintain a predetermined rotational position around the respective axes (9a) relative to said table (6) except when they are positioned in said second transfer station (11) and in said sewing station (12) in which they are respectively connected to said first individual rotation means (21) and to said second individual rotation means (66) of the dies (9). 13. Machine, according to one or more of the preceding claims, characterized in that each of said dies (9) is provided with disengagement means (95) of the bottom (81a) or lid (81b), consisting of a plate base ( 82) and a belt (83) sewn together. 14. Machine, according to one or more of the preceding claims, characterized in that said disengagement means (95) of the bottom (8aa) or lid (81b) comprise an annular body (96) arranged coaxially on the lateral surface of each die (9 ) below the area occupied or usable by the belt (83), said annular body (96) being axially movable upwards with respect to the remaining part of the relative matrix (9) to engage with the lower edge of the belt (83) and push towards the bottom (81a) or lid (81b) at the top, said disengagement means (95) being activated in proximity to said third transfer station (13). 15. Machine according to one or more of the preceding claims, characterized in that, in said second transfer station (11) and / or in said sewing station (12) there is arranged a relative upper pad (47, 93) which can be actuated at command to press the plate base (82) onto the upper base of the relative die (9). 16. Machine according to one or more of the preceding claims, characterized in that each of said matrices (9) is provided, on its upper base, with a suction cup (94) for holding a plate base (82). 17. Machine, according to one or more of the preceding claims, characterized in that each of said dies (9) houses riveting devices (78) provided with an end positioned in the corner area between the upper base and the lateral surface of the relative die (9) , said riveting devices (78) cooperating with said sewing head (68) to clinch the stitches (84) applied by said sewing head (68) in said corner region. 18. Machine, according to one or more of the preceding claims, characterized in that it comprises two twin production units (A, B) side by side, respectively a production unit (A) for the production of bottoms (81a) and a production unit for the production of lids (8lb). 19. Machine, according to one or more of the preceding claims, characterized in that it comprises a coupling unit ©, each time, of a bottom (81a) with a lid (81b) at the outlet from said two production units (A , B). 20. Machine, according to one or more of the preceding claims, characterized in that said coupling unit (C) comprises positioning means (100) for facing each time, with their open side, a bottom (81a), in output from one of said production units (A, B), and a lid (81b) output from the other of said two production units (A, B). 21. Machine, according to one or more of the preceding claims, characterized in that said positioning means comprise two twin conveyor belts (101a, 101b) side by side, each fed by the outlet conveyor (19) of each of said two production units (A , B), each of said twin conveyor belts (101a, 101b) developing along a path having a horizontal section and a vertical section, said vertical section facing a support edge (104a, 104b) for maintaining the bottoms (81a ) or lids (81b) with their plate base (82) in a substantially vertical position, each of said twin conveyor belts (101a, 101b) opening into a relative vertical guide (105a, 105b) facing the vertical guide (105b, 105a ) of the other of said twin conveyor belts (101b, 101a), said vertical guides (105a, 105b) feeding a coupling device (106) of a bottom (81a), fed by a guide from vertical (105a, 105b), with a cover (81b) fed from the other vertical guide (105b, 105a).