FIELD OF THE INVENTION

The present invention concerns a plant and the corresponding method for packaging products in strips, such as, to give a non-restrictive example, chewing gum, tablets or other.

In particular, the plant according to the present invention comprises one or more wrapping machines in which each of the products in strips is wrapped in suitable protective means, and boxing machines in which a plurality of the products, previously wrapped and organized, are subsequently introduced and packed in a package.

Here and hereafter in the description and the claims, by products in strips we mean products with a substantially parallelepiped shape with a thickness that is at least smaller than the length.

BACKGROUND OF THE INVENTION

It is known to package, in an organized manner, in a single main package, a plurality of products in strips, such as for example chewing gum or other.

In particular, it is known to dispose the products in strips, already protected by sheets that wrap them, adjacent to each other, so that they can be introduced into a single package which keeps them positioned and associated in an organized manner.

Indeed it is known to provide that, before being packaged in a group of products, the products are each suitably wrapped with suitable protective means, such as for example silver foil, protective films etc., to keep each product separate from the other and individually protected even when the main package is open.

To this purpose a packaging plant is known which comprises a wrapping machine in which each of the products arriving from production stations, is wrapped with the protective means and is normally disposed, in an organized manner and in the envisaged disposition, on a suitable feed line which provides to transfer them to a boxing machine.

The boxing machine picks up on each occasion from the feed line the products previously wrapped and organized, and introduces them into the package provided in a known manner.

The wrapping machine can be disposed in line with the boxing machine so that the feed line moves the products in a rectilinear manner. The boxing machine and the wrapping machine can be the synchronized type, or not.

A plant structured in this way often cannot be reconciled with the requirements of the spaces available.

One disadvantage of plants with a wrapping machine and a boxing machine is that the wrapping machine can form a bottleneck, with a corresponding reduction in the productivity of the plant.

This has led to feed modern boxing machines with two or more wrapping machines, which makes it necessary to dispose at least one of the wrapping machines not in line with the boxing machine.

In this case the problem then arises of making the wrapped and organized products arriving from the wrapping machines available to the boxing machine at the desired cadence.

The transfer operations are carried out manually or with the aid of transfer devices which, since they do not act on the same feed/delivery plane as the machines, have the disadvantage that they modify the orientation and organization of the products during the transfer. Consequently, before being introduced into the boxing machine, the products have to be properly oriented and organized for their subsequent packaging in groups.

Another disadvantage is that, if a stoppage occurs in the wrapping machine, for example due to blockages or for maintenance, then the machine downstream must also be stopped, with consequent losses both in terms of time and in economic terms.

Documents IT-B-1.219.312 and GB-A-2.142.598 describe plants of a known type for packaging products in strips.

One purpose of the present invention is to obtain a plant that is compact and which allows to transfer and feed, in the required time and with the required rhythms, to a boxing machine, without modifying the orientation and organization thereof, the wrapped products arriving from one or more wrapping machines of which at least one is disposed staggered with respect to the boxing machine.

Another purpose of the present invention is to allow two or more wrapping machines to feed the boxing machine, whether the machines operate synchronously or asynchronously.

Another purpose of the invention is to be able to feed the boxing machine with a single transfer line, even if the wrapping machines feed their own transfer lines which are separate from that of the boxing machine.

It is also a purpose to obtain transfer lines that transport the products in an organized manner and deliver them in an organized manner to the boxing machine.

It is also a purpose to obtain transfer lines which do not modify the position and orientation of the products with respect to the sliding plane during their movement.

It is also a purpose of the present invention to obtain a transfer line that is simple, easy to adjust and maintain, easily controlled and cleaned, and easy to equip for a change of product.

The Applicant has devised, tested and embodied the present invention to overcome the shortcomings of the state of the art and to obtain these and other purposes and advantages.

SUMMARY OF THE INVENTION

The present invention is set forth and characterized in the independent claims, while the dependent claims describe other characteristics of the invention or variants to the main inventive idea.

In accordance with the above purposes, a plant for packaging uniform groups of products in strips such as chewing gum and other according to the present invention comprises at least one wrapping machine, in which each of the individual products in strips is wrapped in respective protective means, and a boxing machine, disposed downstream, not in line and displaced with respect to the wrapping machine.

In other forms of embodiment, the plant comprises at least two wrapping machines which feed a individual boxing machine by means of at least a transfer unit.

In this way it is possible to feed the boxing machine, synchronously or not, with one or more wrapping machines.

In the case of two wrapping machines feeding one boxing machine, for example, the transfer unit comprises at least one transfer line associated respectively with each of the wrapping machines. One of the transfer lines is suitable to feed the boxing machine.

In variant forms of embodiment, the transfer lines are disposed distanced and parallel with respect to each other and are suitable to move, in an organized manner and at the desired cadence, the individual groups of products in strips, keeping the individual components of the groups of products in the reciprocal positions that they will have at the end of the packaging.

According to this form of embodiment, between the transfer lines at least one intermediate transfer line is provided, which is disposed transversely at least between two of the transfer lines.

In variant forms of embodiment, the intermediate transfer line is suitable to move, continuously and autonomously, the individual groups of products at least between the two transfer lines, keeping the groups of products in strips positioned and oriented as they are in the transfer lines.

The boxing machine will therefore receive, according to the predetermined cadence, the organized products arriving from the first wrapping machine and also from the second wrapping machine.

Different variants of reciprocal positioning of the transfer lines and of the intermediate transfer line or lines are possible according to the number of wrapping machines that feed the boxing machine, and to the layout of the plant.

In a variant, the transfer lines comprise first transfer lines departing from each wrapping machine. Furthermore, in this variant, between at least one of said first transfer lines and the boxing machine there is at least a second transfer line.

According to another variant, at least one of said first transfer lines is connected to the second transfer line by an intermediate transfer line.

Moreover, in another variant, each of the first transfer lines, the second transfer line and also the intermediate transfer line are configured to move the groups of products in strips so that they always lie on the same sliding plane and keep the same reciprocal orientation and positioning as the individual products.

It comes within the scope of the present invention to provide that the wrapping machines are associated with temporary holding means or buffers, in which the products in strips, previously wrapped, are temporarily disposed.

According to the invention, the transfer lines provide a plurality of individual movement sliders suitable to support in an organized manner and in predefined quantities, and also to move a determinate number and type of the products in strips.

According to the invention, in the transfer lines the movement sliders advance step-wise and transport the products resting upon them.

According to another form of embodiment, the intermediate transfer line comprises pick-up and delivery sliders which also advance step-wise, in coordination with the movement sliders of the transfer lines.

The pick-up and delivery sliders of the intermediate transfer line pick up and respectively deliver the products, on each occasion from and into the movement sliders, and move them by thrusting them, since the sliders are disposed above the products.

According to a preferential solution, the pick-up and delivery sliders of the intermediate transfer line move in a direction orthogonal to that of the movement sliders of the transfer lines.

According to the invention, the movement sliders and the pick-up and delivery sliders are suitable to move a number of products equal to the number of products in strips which, on each occasion, are delivered to the boxing machine.

The present invention also concerns the corresponding method for transferring products in strips for packaging, as described above.

BRIEF DESCRIPTION OF THE DRAWINGS

These and other characteristics of the present invention will become apparent from the following description of some forms of embodiment, given as a non- restrictive example with reference to the attached drawings wherein:

- fig. 1 is a schematic representation of a first layout of a plant for packaging products in strips according to the present invention;

- fig. 2 is a schematic representation of a second layout of a plant for packaging products in strips;

- fig. 3 is a schematic representation of a third layout of a plant according to the present invention; - fig. 4 is a schematic representation of a detail of a plant according to the present invention;

- fig. 5 is a perspective view of a detail of fig. 4;

- fig. 6 is a section view of part of fig. 5;

- fig. 7 is a section view of part of fig. 5.

To facilitate comprehension, the same reference numbers have been used, where possible, to identify identical common elements in the drawings. It is understood that elements and characteristics of one form of embodiment can conveniently be incorporated into other forms of embodiment without further clarifications.

DETAILED DESCRIPTION OF SOME FORMS OF EMBODIMENT

With reference to the attached drawings, a plant for packaging products in strips 10, such as for example chewing gum, comprises a first 1 1 and a second wrapping machine 12 in which each of the products in strips arriving for example from a production machine is wrapped in a known manner in protective means, for example silver foil, protective films or other.

The plant 10 also comprises a boxing machine 13, disposed downstream of the wrapping machines 11, 12, in which the products previously wrapped in the protective means are organized in groups of a determinate number of products, to be suitably packaged with a single packaging sheet or in suitable containing envelopes or boxes.

A transfer unit 15 is provided to transfer the products from the wrapping machines 1 1, 12 to the boxing machine 13.

With reference to fig. 1, a first layout of the plant 10 is shown in which the transfer unit 15 comprises a first transfer line 16 and a second transfer line 17 disposed parallel to each other and cooperating respectively with the first wrapping machine 1 1 and the second wrapping machine 12.

The first transfer line 16 picks up the products from the first wrapping machine 1 1 and makes them available directly to the boxing machine 13.

The second transfer line 17 picks up the products from the second wrapping machine 12 and delivers them to an intermediate transfer line 19.

The intermediate transfer line 19, disposed transversely to the first 16 and the second transfer line 17, cooperates with the latter to feed the products wrapped by the second wrapping machine 12 toward the boxing machine 13.

In some advantageous forms of embodiment, the first 16, the second transfer line 17 and the intermediate transfer line 19 consist of conveyor belts provided with movement sliders on which the products to be moved are disposed.

The functioning of the wrapping machines 1 1, 12 in this case is correlated synchronously to the functioning of the boxing machine 13, for example providing that the latter receives first groups of products alternately from the first wrapping machine 1 1 and second groups of products from the second wrapping machine 12.

With reference to fig. 2, a second layout of the plant 10 is shown, in which the transfer lines 16, 17 previously described with reference to fig. 1, instead of being served directly by the wrapping machines 1 1, 12 are each served by feed devices 21, 22.

In particular, the products wrapped by the two wrapping machines 1 1, 12 are disposed in respective temporary holding stores 23 and, by means of the feed devices 21, 22, are transferred to the transfer lines 16, 17.

The temporary holding stores 23 allow to temporarily house the products that have been wrapped in the protective mean to make them available for the needs of the boxing machine 13.

The feed devices 21, 22 can comprise thruster elements, which from the temporary holding stores 23 translate the products to the respective transfer lines 16, 17.

Fig. 3 shows a third layout of the plant 10 according to the invention, in which the products wrapped by the wrapping machines 1 1, 12 are temporarily disposed in the respective holding stores 23 and the feed devices 21, 22 transfer them to the first 16 and the second transfer line 17.

Each of the transfer lines 16 and 17 is served by a respective intermediate transfer line 19, identical to the one described with reference to figs. 1 and 2.

Each intermediate transfer line 19 makes the products available to a single feeder 25 of the boxing machine 13.

In this form of embodiment the feed devices 21, 22 are the rotary drum type and are suitable to pick up the products from the corresponding holding stores 23 and make them available to the transfer lines 16, 17. In still other forms of embodiment, again with reference to fig. 3, it can be provided that the holding stores 23 are replaced by movement lines that transfer the products to the feed devices 21, 22 in synchrony with the functioning of the wrapping machines 1 1, 12. The feed devices 21, 22 in this case also perform the function of temporarily holding the products in strips to make them available for the needs of the transfer lines 16, 17. In this way the feed devices 21, 22 correlate between them the functioning of the upstream and downstream parts.

Both the second and the third layout of the plant 10 described with reference to figs. 2 and 3 allow to disconnect the functioning of the wrapping machines 1 1, 12 with respect to the functioning of the boxing machine 13, conferring greater versatility on the plant 10, both during normal use and also, for example, in maintenance conditions, allowing only one wrapping machine to function.

With reference to figs. 4-6, the second transfer line 17 is described, even though an identical description can be provided both for the first transfer line 16 and for the feeder 25 (fig. 3).

The second transfer line 17 comprises a belt 29 which winds between a drive pulley and a return pulley and to which a plurality of movement sliders 27 are associated. During use, a plurality of products in strips, in this case chewing gum G, are positioned in an organized manner on the movement sliders 27. In variant forms of embodiment, the movement sliders 27 are intended respectively to contain, move and thrust the groups of products in strips on an autonomous continuous surface.

In particular, at least the segment of belt 29 (figs. 4 - 6) that faces toward the upper part is provided with a support plane 32 for the movement sliders 27, which allows a regular translation of the latter without problems of oscillation due to their inertia and to the flexibility of the belt 29.

The movement sliders 27 are associated to the belt 29 in proximity to a cavity 30 in them, by means of substantially known connection means, for example by means of threaded connections.

Each movement slider 27 is provided with a support plane 33 with a width L (fig. 6), which is smaller than the length B of the chewing gums G so that, when the chewing gums are disposed on the movement slider 27, the respective ends protrude. In this case, the chewing gums G are moved disposing their length B in a transverse direction with respect to the direction of advance of the movement slider 27. It is quite obvious that, in other forms of embodiment, the chewing gums G can also be disposed according to a different orientation. In this last case it will be necessary to provide suitable containing means able to contain the chewing gums during their movement, and to allow them to be picked up and delivered by other transfer means, as will be described hereafter.

The movement slider 27 is also provided with protruding portions 36 for positioning the groups of products in strips, which extend from the support plane 33 and are disposed at the four corners of the movement slider 27.

The protruding portions 36 (fig. 5) define a usable length W of the support plane 33 which is a finite multiple of the width of each chewing gum G. In this way a determinate number of chewing gums G can be disposed and contained on the support plane 33, in this case seven. It is advantageous to provide that the number of chewing gums G is equal to the number of chewing gums that are subsequently grouped together and packaged in a single package in the boxing machine 13.

At the opposite sides of the support plane 32 two lateral containing walls 39 are associated, which are suitable to contain the chewing gums G on the movement sliders 27, preventing any transverse displacement thereof during movement.

According to an advantageous form of embodiment, a presser device 40 is associated with the upper part of the first transfer mean 16, substantially along its entire longitudinal extension, with the function of keeping the chewing gums G adherent to the support plane 33 of the movement sliders 27.

The intermediate transfer line 19, which in figs. 1 and 2 extends transversely between the first 16 and the second transfer line 17, comprises a belt 41 (figs. 4 - 7) which winds between a drive pulley 42 and a return pulley 43, and to which a plurality of pick-up/delivery sliders 45 are associated.

The drive pulley 42 and the return pulley 43 are associated to a bearing structure 46 (fig. 5).

At least the pick-up/delivery sliders 45 that are associated with the lower segment of the belt 41 are suitable to slide on a sliding plane 47 which, with reference to fig. 4, extends from the first 16 to the second transfer line 17. It is advantageous to provide that the sliding plane 47 is connected, or at least put in continuity, with the support plane 33 of the movement slider 27, so that the chewing gums G can move upon it without problems of jamming.

Each pick-up/delivery slider 45 (fig. 6) is provided with a substantially continuous surface 48 on which two through grooves 49 are made.

The through grooves 49 are disposed in positions suitable to allow the protruding portions 36 of the movement sliders 27 to pass through them. More specifically, when the chewing gums G are picked up by one of the movement sliders 27, the pick-up/delivery slider 45 is positioned above the latter so that the surface 48 is facing the chewing gums G. In this condition (fig. 5), the protruding portions 36 of the movement slider 27 are disposed outside the transverse bulk of the pick-up/delivery slider 45 so that they do not create any interference with the movement of the movement slider 27.

The surface 48 of the pick-up/delivery slider 45 is also provided with two opposite protruding edges 50 which extend transversely to its normal direction of advance and have the function of thrusting the chewing gums G along the sliding plane 47.

The pick-up/delivery slider 45 also comprises two opposite first guide elements 51 which extend along its longitudinal sides, and which are suitable to cooperate with the bearing structure 46.

The bearing structure 46 comprises second guide elements 52 on which, during use, the first guide elements 51 of the pick-up/delivery sliders 45 rest, and a pressure plate 53 which, by means of spring means 55, is pressed against the pick-up/delivery slider 45.

The pressure plate 53 therefore allows to keep the pick-up/delivery slider 45 adherent to the second guide elements 52 and in a parallel condition with the sliding plane 47, reducing problems of jamming of the intermediate transfer line 19.

The intermediate transfer line 19 (fig. 7) also comprises lateral containing walls 56 suitable to contain the chewing gums G as they are moved along the sliding plane 47.

It is advantageous to provide that hinge means are also associated with the intermediate transfer line 19, which allow to lift, by rotation around a longitudinal pin, the bearing structure 46 with respect to the sliding plane 47. In fact, in the event of any jamming, this allows to maintain or clean the machine, so that normal functioning conditions can be restored.

The pick-up/delivery slider 45 delivers the chewing gums G to the first transfer line 16 and loads them onto a movement slider in exactly the same way as described for the second transfer line 17. The chewing gums G are therefore repositioned in an organized manner on the movement slider of the first transfer line 16 to subsequently feed them to the boxing machine 13.

The plant according to the present invention functions as follows.

The chewing gums G wrapped by the protective sheets in the wrapping machines 1 1, 12 are made available, either directly (fig. 1) or by the feed devices 21, 22 to the transfer lines 16, 17.

The chewing gums G are loaded, organized in groups, onto the movement sliders 27 of the transfer lines 16, 17. Therefore, each movement slider 27 supports a determinate number of chewing gums G which advantageously coincides with the number of chewing gums G that will subsequently be packaged in a single package.

The chewing gums G loaded on the second transfer line 17 are taken near to a pick-up zone 56 (fig. 4) of the intermediate transfer line 19.

When the movement slider 27 moves to the pick-up zone 56, the pickup/delivery slider 45 is already positioned above it. Subsequently the pickup/delivery slider 45 is moved toward the first transfer line 16, moving the chewing gums G from the movement slider 27 along the sliding plane 47. A successive pick-up/delivery slider 45 is disposed on this last movement slider 27. A discrete movement of the sliders of the second transfer line 17 disposes a successive movement slider 27 in correspondence with the pick-up/delivery slider 45 to pick up and transfer other chewing gums G.

Therefore, with a discrete and alternate movement of the sliders of the second transfer line 17 and those of the intermediate transfer line 19, it is possible to transfer the chewing gums G in groups toward the first transfer line 16, and in correspondence with a discharge zone 57.

In correspondence with the discharge zone 57 the chewing gums G are translated from the sliding plane 47 to the movement slider 27 of the first transfer line 16.

The first transfer line 16 in turn transfers the chewing gums G to the boxing machine 13 in which they are packaged.

Given that the first transfer line 16 is suitable to feed both the chewing gums G of the first wrapping machine 1 1 and also those of the second wrapping machine 12, the chewing gums G will be loaded in proximity to the first wrapping machine 1 1 onto the movement sliders 27 of the first transfer line 16 in a staggered manner, so as to leave one movement slider 27 free for loading the chewing gums arriving from the intermediate transfer line 19.

This therefore means that the first transfer line 16 is made to function with double productivity compared with the second transfer line 17.

It is clear that modifications and/ or additions of parts may be made to the plant for packaging products in strips and the corresponding method as described heretofore, without departing from the field and scope of the present invention. For example, in some forms of embodiment it is possible to provide that, with reference to fig. 2, the second transfer line 17 is provided with movement sliders 27 suitable to move in a group a first number of chewing gums G. In the same way, the pick-up/delivery sliders 45 of the intermediate transfer line 19 are also suitable to move the same first number of chewing gums G, toward the first transfer line 16. The first transfer line 16 is in turn provided with first movement sliders and second movement sliders in which the first movement sliders are suitable to move a second number of chewing gums G from the first wrapping machine 1 1, while the second movement sliders are suitable to receive the chewing gums G of the first intermediate transfer line 19. Consequently, the first transfer line 16 will deliver on each occasion to the boxing machine 13 the first number and the second number of products.

The same considerations can be made with reference to fig. 3, where it is provided that the two intermediate transfer lines 19 respectively move the first number and the second number of chewing gums G toward the feeder 25 which in this case performs the same function as the first transfer line 16, described with reference to figs. 1 and 2.

In the same way, in other forms of embodiment, if only one wrapping machine 12 is provided, disposed staggered with respect to the boxing machine 13, it is possible to provide a similar disposition of the layout as described with reference to fig. 3 in which the first wrapping machine 1 1 and the transfer lines connected to it are not present.

In this case it is possible to provide that the feed devices 22 pick up from the stores 23, alternately, a first number and a second number of chewing gums G to make them available respectively on first and second movement sliders 27 of the second transfer line 17. Subsequently, corresponding pick-up/delivery sliders of the intermediate transfer line 19 and other movement sliders of the feeder 25 will supply the first and the second number of chewing gums G in an organized manner to the boxing machine 13.

It is also clear that, although the present invention has been described with reference to some specific examples, a person of skill in the art shall certainly be able to achieve many other equivalent forms of plant for packaging products in strip such as chewing gum and the corresponding method, having the characteristics as set forth in the claims and hence all coming within the field of protective defined thereby.

For example, according to some variants it is possible to provide that all the machines of the plant 10 of the present invention, in particular the wrapping machines 1 1, 12 and the boxing machine 13, operate in synchrony with each other.

In another variant, it is possible to provide that all the machines of the plant 10 of the present invention, in particular the wrapping machines 1 1, 12 and the boxing machine 13, operate asynchronously with each other.

Furthermore, another variant of the present invention provides that the wrapping machines 1 1, 12 operate in synchrony with each other, while the boxing machine 13 operates asynchronously.

Moreover, another variant of the present invention provides that one of the wrapping machines 1 1, 12 operates in synchrony with the boxing machine 13, while the other wrapping machine 1 1, 12 operates asynchronously.

Depending on one variant or the other as described above, it is provided that the transfer lines 16, 17, 25 and the intermediate transfer lines 19 are consequently conditioned or conditionable to the synchronous or asynchronous functioning of the machines of the plant 10.