FRAME FOR A PACKAGING MACHINE

The present finding concerns a support frame for a packaging machine, according to the general part of claim 1.

As it is well known to industrial machine designers, a support frame must substantially satisfy two requisities: it must be sufficiently strong so as to be able to support all the mechanical components necessary for the operation of the machine and, at the same time, it must have minimal bulk, thus being as small as possible.

Such a rational construction of the frame is particularly necessary in packing machines, such as packaging machines of the most different types, known by the commercial term "horizontal flow-pack", using a centre folded or side sealing machine, with twin reel or reel feed from below, suitable for packaging a product that may or may not be a food product, through the use of plastic films, heat-sealable or cold welded, wound in a reel.

First models of such machines that appeared on the market had a frame that was made up of a cast iron box, which was positioned below the working area and which had considerable dimensions, so as to be able to contain the actuation apparatuses, which included electric motors, chains and drive shafts and where the electric compartment was made up of a small box, which also acted as a control panel. As progress was made in terms of technology the mechanical actuation apparatuses were gradually replaced by electronic actuation apparatuses with consequent increase of the dimensions of the electrical syste, integrated in the machine.

Substantial progress was made with the introduction of so called "simple cantilever frames", in which the box containing the mechanical control components and the electric installation is positioned laterally with respect to the working area, which is moved to the side and is mounted cantilevered.

In practice, such a construction solution (as an example we shall mention patent document US4947605) has the advantage that, with the mechanical operation components arranged cantilevered, the rea under the product being packaged is free, thus making it possible to have grater cleanliness, preventing material, which when of the food product type is source of bacteria and mould, from gathering.

On the other hand, again in practice, the presence of the box again constitutes a bulk, which causes there to be a waste of space and allows only the cantilevered side to be accessible, with the consequence of having a consuderable waste of time in the case in which the worker has to intervene on the opposite side.

A packaging machine having the technical features of the preamble of the appended claim 1 is known for example from US4757668A, FR2440313A1, "PFM Packaging Machinery Mistral" brochure and WO2007/091284A1.

The purpose of the present finding is that of making a support frame for packaging machines, which does not have the drawbacks of similar known products.

Such a purpose is achieved by making a frame which is provided with two cantilevered supports, arranged parallel and over one another and in which the lower support sustains the mechanical operation components, whereas the upper support sustains the electrical control group and, possibly, also the pneumatic system.

Specifically, the lower support places the mechanical componets at the height of a work plane that is accessible to the worker, from 70/90 cm from the ground, whereas the upper support sustains the control group at a height that is greater than the human stature, advantageously above 2 metres from the ground.

The finding shall become clearer with the description of a possible embodiment thereof, given only as an example and not for limiting purposes, with the help of the attached drawing tables, in which:

• figs. 1, 2 represent two views, a perspective front view and a view from the top, respectively, of a packaging machine equipped with the support frame according to the finding;
• figs. 3, 4, 5 represent three perspective views of the machine according to fig. 1, with constructive details;
• figs. 6, 7 represent a perspective front view and a view from the top, respectively, of the machine according to fig. 1, equipped with safety guards.

As visible in fig. 1, a packaging machine, of the so called flow-pack type, is equipped with a support frame, indicated with reference numeral 100, in its most basic form, resempling a welded structure shaped like a capital "E", formed from a tube or made from folded sheet metal, in which there are a first lower cantilevered support, generally indicated with reference numeral 101, only supported on one side and at the ends through the two uprights 1; said uprights support a second cantilevered support, in a higher position, generally indicated with the reference numeral 102. Constructively, the frame is made up of two uprights 1, equipped with a horizontal base 2, which support a transverse plate 3 on which all the mechanic components are mounted cantilevered, indicated with reference numeral 200 and that, specifically in the machine, comprises a belt 201 for feeding the products P, a reel of heat-sealing film 202, a welding group 203, a cut and sew group 204 and a belt 205 for discharging the packaged product P1.

The two uprights 1 end, at the top, with a cantilevered shelf, indicated with reference numeral 4, on which rest a box 5, which encloses the electric installation and, possibly, also the pneumatic system; again, the control panel 7, with buttons and an interface display for controlling the machine, is applied onto said shelf.

As visible, in particular, in fig. 2, with the specific shape of the frame 100 according to the finding it is possible for a person in charge to work in a perfectly ergonomic way, since he can act at both sides of the machine, controlling it from a single control panel 7, since it is sustained by a rotating arm 8, with the machanical componets 200 positioned on the lower cantilevered support 101, which is at the right height "H" from the ground and with all the electric and pneumatic components positioned on the upper cantilevered support 102, arranged at a height "H1" that is greater than the human stature, with the purpose of protecting the head of the worker when intervening on the work surface.

Moreover, as visible in fig. 3, the substantially tubular structure of the frame 100 allows the passage of the electric wires 10 inside the uprights 1, to where they reach the motors that actuate the mechanical components 200, in complete safety.

Moreover, as visible in fig. 4, in the case in which the machine is equipped with control members that can weigh down the boxes 5 and/or 6 or when the mechanical members are very stressed, it is sufficient to add some reinforcement rods 11 to the frame 100, so as to strengthen the structure of the frame 100.

Moreover, as visible in fig. 5, the finding foresees the possibility of being able to temporarily lower the boxes 5 and 6, bringing them back inside the frame 1, so as to facilitate the positioning of the machine, completely mounted, inside a shipping container 12, with standard height.

Finally, as visible in figs. 6 and 7, the shape of the frame 100 makes it possible for the safety doors 13 to be applied, advantageously made from transparent polycarbonate, on the two sides of the machine, which is thus conceived very rationally and has a small bulk.

From what has been outlined above it can be understood that the proposed purposes have been achieved, since the use of the frame according to the finding makes it possible to obtain:

• a machine that is accessible, by the workers, from both the right and left side, even simultaneously;
• the possibility of completely eliminating process waste since said materials, falling on the ground, can be easily removed;
• the drastic reduction of the side bulk;
• the rationalization in the positioning of the components, leaving the field of view of the worker completely free, avoiding interference with his head;
• the rationalization of the side safety protection elements;
• the almost complete elimination of the risk of a worker, using the electric installation, being electrocuted.

Of course, the dimensions, the materials and the technical components of the frame according to the finding can be wide-ranging, as long as it is all covered by the inventive concept defined by the following claims.