A PACKAGING MACHINE WITH STATION FOR FOLDING AND CLOSING A PREFORMED CARTON AND METHOD THEREFOR

Abstract

Machinery for packaging articles (15, 15′) in preformed cartons (18), having a conveyor (19) for making cartons travel with an article resting on top of the carton, partially enclosed by the carton, comprising a closing station, in particular having first folding means (24) designed to lift a first side wall of the said carton arranged transversely to the carton progress direction (A) so that it is positioned against the article, in particular towards the rear of the article with respect to the carton progress direction, characterised by the fact that said closing station may be moved parallel to the carton progress direction, wherein the closing station is integral to a sliding surface (20) which is parallel to the surface (26) of the machine on top of which the cartons travel. Packaging method using a machine as described above.

Claims

1. Machinery for packaging articles in pre formed cartons, having a conveyor for making cartons to proceed with an article resting on top of the carton and partially enclosed by the carton, comprising: a station for closure including first folding means designed to lift a first side wall of said carton and arranged transversely to the carton progress direction up towards the article, in particular towards the rear of the article with respect to the carton progress direction, wherein said closure station may be moved parallel to the carton progress direction.

2. The machinery according to claim 1, wherein the closing station further comprises means of applying adhesive to said side wall coupled with the first folding means.

3. The machinery according to claim 1, wherein said closing station comprises second folding means designed to press a carton closing flap against the said side wall.

4. The machinery according to claim 1, further comprising a folding station having a folding zone comprising third folding means designed to lift a second side wall of the carton opposite the first and arranged in front of the article with respect to the carton progress direction against the article and to fold an upper wall hinged onto the second side wall over the article, wherein said folding zone may be moved parallel to the carton progress direction.

5. The machinery according to claim 1, wherein said closure station is integral with a sliding surface which can be moved in said progress direction, parallel to a surface of the machinery on top of which the cartons proceed.

6. A method for packaging articles in cartons comprising the following steps: progressing of the cartons containing a partially enclosed article in a progress direction by means of a conveyor; gripping of the carton by folding means and, optionally, application of adhesive by a closing station; moving of the closing station during the gripping phase in the carton progress direction, so that the proceeding carton and the station are in a mutually stationary position; releasing of the closed carton by said means; and moving of the closing station in the opposite direction to the carton progress direction in order to bring the said station back to the original position.

Description

[0013] The invention will now be better described by illustrating preferred embodiments, provided by way of example, without limiting the scope of protection of the patent and with particular reference to the figures, in which:

[0014] FIG. 1 shows, schematically, a perspective view of a machine for the formation of cartons and for the packaging of articles, according to the present invention, as a whole;

[0015] FIG. 2 shows, schematically, a closing station during the closing and gluing of a carton;

[0016] FIG. 3 shows, schematically, the closing station after the release of the closed carton;

[0017] FIG. 4 shows, schematically, a further view of the closing station with the first folding and glue application means processing the carton.

[0018] A machine according to the invention is shown in FIG. 1.

[0019] In this machine, a cardboard web 1 is fed by commonly known means, as a reel or fan-folded or made in another suitable way, for example as described in applications EP 3 529 050 or IT 102018000009606. A first cutting station 2 separates a rectangular portion from the web, for the creation of a carton following further formation steps. The carton proceeds on a suitable conveyor (of a commonly known kind) and reaches a creasing station 3 designed to create suitable creases, both longitudinally and transversely to the carton feed direction. A second cutting station 4 is designed to perform a series of notches. According to a preferred aspect of the invention, the said cutting station may be made, for example, according to the teachings of EP 3 464 073 A1. According to a further aspect, this solution may be modified by doubling the number of cutting units. In this way, the transversal cuts, on the transversal creases of the carton produced according to this document, could be made in a single step instead of two, eliminating the need to slow down or stop the carton during the formation thereof. Obviously, it should be made possible to space the various cutting units at the same time in a suitable way, so that they are positioned over the creases at the same time.

[0020] This is followed by a gluing station 16, where the glue is applied in a suitable position, and a folding station 17. The folding station may be similar to that described in one of the applications mentioned above, or it may be made so that it closes up all the reinforcing and closing flaps and then reopens the side closing flaps with suitable reopening means. This makes it possible to create a much simpler folding station, which does not require the carton to make stops on the conveyor. The carton reaches position 7, where the article to be packaged 15, 15′ is placed with the reinforcement flaps glued onto the central portion and the side closing flaps open, to allow placement of the article.

[0021] The article can come from a loading station comprising one or more loading belts 6, 6′, onto which articles may be loaded by operators. In the case exemplified, there are two loading belts. The articles on the second belt are pushed by suitable means 5 onto the first belt, alternating them with those loaded directly onto the first belt. A measuring structure 13 measures the position and dimensions of the article. This data is used to size the carton according to the dimensions of the article. An alignment system 14 appropriately centres the article, which moves onto a conveyor belt 35 that places it on the preformed carton at point 7. The loading and placement of the article can also take place in another commonly known way.

[0022] After the article has been placed on the carton, the carton reaches a further folding (and gluing station) 8 and a final closing station 9. The latter can be followed by further processing stations 10, for example for labelling.

[0023] The carton, as said, can be made, for example, as described in EP 3 093 246 A1. However, the machinery and the method according to the present invention are not limited to application to this type of carton, but can also be used with other types of carton that have suitable characteristics.

[0024] With reference to FIG. 2, one can observe a carton 18 moved by a suitable conveyor 19 (of a commonly known type), for example a conveyor belt located underneath the carton, which moves it by friction.

[0025] The carton encloses the article to be packaged.

[0026] The second folding means 21 (lowered onto the carton) are visible, as are the stop means 22, which hold the carton in position with respect to the folding station. A transverse opening 23 is also visible on the first movable sliding surface 20.

[0027] The transverse opening allows entry of the first folding means 24 during the stages in which these do not engage with the carton, and the first means can leave the first movable sliding surface 20 through this opening, in order to process the carton, as shown in FIG. 4. For the production of the folding station, all the solutions described in EP 3 464 074 B1 may be adopted. The present invention, according to one aspect thereof, may differ from that described in this document solely in terms of the features specified below.

[0028] Instead of being fixed with respect to the rest of the machinery, the first movable sliding surface 20 is designed to travel in the same feed direction as the carton, as shown in the figures with arrow A.

[0029] This may be parallel to a surface of the machine 26 and facing downwards through the window made in the machine's surface, the said window having the sides denoted 25, essentially lending continuity to the surface, while also allowing the closing station to travel. The first sliding surface may be mounted on an undercarriage which is moved inside the machine in a commonly known way (via motors and electric transmissions, hydraulic or pneumatic cylinders, or other methods). The opening 23 is integral with the first sliding surface, as are all the structures of the folding station, and the said surface can move between a first position, in the direction of the origin of the cartons, carried by the conveyor belt 19, and a second position, in the direction where the cartons leave the folding station. While the conveyor belt can continue to travel uninterruptedly in the feed direction, the folding station in the first position receives the carton and secures it with the stop means 22, essentially in the manner described in EP 3 464 074 B1. The first sliding surface travels at the same speed as the conveyor belt 19 which moves the carton 18 in the same direction, remaining mutually stationary with the belt, during all the closing stages, which comprise the first folding means leaving via the opening 23, the side wall of the carton being lifted, the glue being applied by means 27 in FIG. 4, and the closing flap of the carton being closed by the second folding means. Once these procedures are complete, the carton is released by the folding and stopping means, the first folding means retract through the opening 23 underneath the first sliding surface and the latter can travel from the second position (which it had reached by travelling in the carton feed direction) to the first position, where it can receive another carton to be closed. Meanwhile, the carton just closed can continue to travel towards further processing stages or until it leaves the machine.

[0030] A further difference with respect to document EP 3 464 074 B1 is that, since the cartons no longer need to stop moving, a different solution can be adopted regarding the conveyor, which no longer requires sections, since it preferably moves the cartons at a constant speed throughout all the stages. For example, the same conveyor belt 18 can be used upstream and downstream of the closing station. To get past the opening 23, the belt can enter by means of the end return rollers 28. It can be made to run underneath the first movable sliding surface 20 and underneath all the support and movement structures of the first closing means, by means of one or more tensioning rollers supported integrally to the mobile sliding surface, in particular to the undercarriage supporting the said surface. This way, while the first movable sliding surface translates towards the second position, the conveyor belt is mutually stationary with it, while the surface is free to travel towards or remain mutually stationary with the machine, allowing the belt to continue its motion without interference.

[0031] Other solutions are also possible, for example two different conveyor belt sections. In this case, the travel of the first movable sliding surface must be considered and the belt allowed to cover different lengths over the machines surface and the sliding surface. For example, it will be necessary to provide tensioning systems, generally below the first movable sliding surface or the machine, such as movable rollers or other systems. This solution, if desired, can also allow the carton speed to be altered, for example, according to the dimensions.

[0032] According to one aspect of the invention, upstream of the closing station, the machine has a folding station with a folding zone as specified above. It can be produced in the same was as the second folding zone described in EP 3 464 086 A1 except for the fact that it is mounted integrally to a second movable sliding surface. As can be seen in FIGS. 2 and 3, the second folding zone 30 features the third folding means 32, shown only in part. It is integral with the second movable sliding surface 31, which—from the surface of the machinery 26—can be facing the first sliding surface in a similar way. In this case, contrary to the prior art, the said conveyor unit, and in particular the conveyor belt 19, can run across the folding zone, which travels at the same speed as the belt while the carton is engaged with the folding means and is then brought back to the starting end, as soon as the carton is released, to repeat the processing.