VERTICAL PACKAGING MACHINE WITH SYSTEM FOR FRONT OR BACK CLIPPING

Abstract

 Vertical packaging machine with system for front or back clipping adapted to package products by means of a "tuft" closure, by means of jaws (13, 14) and a height adjustable clipper (16); said machine comprising:
- at least a reel holder shaft adapted to self-align the film contained in the reel;
- at least two photocells;
- at least a forming tube, comprising two collars, adapted to facilitate assembly of the film;
- at least a small tube adapted to insert liquid or gas inside the package;
- at least two belts;
- at least an upper jaw (13), for sealing one side of the package;
- at least a lower jaw, adapted to weld and cut;
- at least a clipper;
- at least a reel;
- at least a motor or piston adapted to move said jaws;
- at least a motor or piston adapted to move said clipper;
- at least a motor or piston adapted to move said film;
- at least a digital display.

Description

Field of the invention

[0001] The invention relates to a type of vertical packaging that allows a "tuft" closure, typical of dairy products, to be made, eliminating the possibility of accumulation of liquids within the tuft when a package with an open tuft (not sealed) or closed is provided.

Prior art

[0002] In the packaging of dairy products, the "open tuft" technique is increasingly used, i.e. a closure in the center of the bag that gives the upper part of the package a triangular shape, which still represents a distinctive sign and a concept of marketing now fixed in the industry.

[0003] This type of packaging is also very common in bakery and many other food products sector. Once the package is sealed and closed in two points (at the bottom and in the center), the application of a clip on the central seal guarantees the creation of the tuft in a simple and effective manner.

[0004] A recurring problem, however, in this type of packaging, especially in the dairy industry, is related to the trapping of a small quantity of liquid inside the tuft during the sealing steps, this problem can compromise the integrity and aesthetics of the cardboard packaging in which the tuft packages are stored or release residual water trapped in the tuft in the following hours, dirtying the hands of users, or surfaces.

[0005] The liquid contained in the tuft further represents an inconvenience for the end customer during the opening steps of the product.

[0006] It should be emphasized that a probable leakage of the liquid from the tuft, during transport, can considerably affect the integrity and strength of the secondary cardboard packaging that carries all the products intended for sale, wetting it with the risk of breaking it and damaging the image for the manufacturer.

[0007] Each machine currently on the market for vertical packaging of dairy products can only rely on packaging with the tuft facing upwards, thus involving the deposit of the liquid in the tuft during the dosage and central sealing step.

[0008] Another limiting element is the fixed size available for the management of the tuft height linked to mechanical and structural constraints of the machines currently on the market. Therefore, if a customer wanted to make 2 identical packages but with tufts of different heights, he/she would not be able to make them without a mechanical replacement of the clipper group which would require hours of work for the format change.

[0009] Furthermore, the existing machines on the market are provided with only one type of clip available (metal, plastic, kwiklok type, twisted, adhesive tape, etc.) for making the narrowing of the tuft. Since different packaging techniques require different clipping techniques, a machine dedicated to each type of tuft required is currently required.

[0010] Finally, making the tuft involves an additional processing step of the package before it can be ejected from the machine. The consecutive sequence of alternating steps involves low production capacity of the packaging systems, forcing companies that need high performance to buy many packaging machines with clips with considerable economic expenditure and encumbrance of space inside the production sites, in addition to the increase in electricity consumption and an increase in the cost of personnel dedicated to packaging.

[0011] Another problem of vertical machines is that of centering the film with respect to the forming tube. This problem involves the difficulty of creating straight and correctly sealed packages with the risk of liquid leaks, if not centered well with the forming tube. The problem is even more evident when in the bag format change it is necessary to replace the film reels that have two different band sizes (width).

[0012] The adjustment of the centering of the film, therefore, essential for the correct functioning of the machine, requires a considerable expenditure of time and labor at each reel replacement. Furthermore, during film centering, plastic material is wasted only to allow centering along the entire roller conveyor system from the reel to the forming tube.

[0013] Many inventions have tried to optimize the packaging material (ES245256) while neglecting the packaging system due to the type of machine.

[0014] The object of the present patent is therefore to remedy the above drawbacks by using a plurality of adjustments which make the vertical packaging machine more versatile and easy to use as well as being more efficient in terms of mechanical capacity.

[0015] A further object of the patent is to remedy the drawbacks related to the clipping group by means of an interchangeable clipping machine which can be easily extracted from the vertical packaging machine by means of a drawer system, without the aid of any specific tool. The clipper included in the subject machine also aims to eliminate the previously required calibration steps.

[0016] The clippers existing to date are often bulky and difficult to use and are difficult to interchange with each other and this causes a considerable waste of time if it is necessary to modify the material with which the clipping is carried out.

[0017] To uninstall a common clipping machine from a packaging machine, hours of labor by specialized technicians are required for the sole purpose of carrying out the minimum maintenance required.

[0018] Another problem frequently encountered is that related to calibration.

[0019] To make a correct clipping, the tighteners that prepare the bag by tightening it in the center must collaborate flawlessly with the matrices that close the clip. If this procedure does not take place simultaneously or at least with the right timing, the clipping is poor and fragile.

[0020] The need to calibrate the times of the tighteners and matrices arises from the fact that the normal clippers are driven by two different pistons. To complete the closing of the clips correctly, these pistons must be perfectly synchronized. The machine calibration and synchronization process takes a long time and, even in this case, the help of highly specialized personnel is required.

[0021] If it were necessary to assemble the clipper from scratch, it would be extremely difficult to position all the components on the milled structure of the machine, since no component has an unambiguous specific joint. It should not be overlooked that, during the clipping steps, the tolerance of the components is minimal, an incorrect installation of any piece could lead to malfunctioning and inevitable breakage.

[0022] The common registered clipping machines (as in the case of the TWM605582 patent) still do not solve the problems highlighted.

[0023] Another problem brilliantly solved by the present invention is that linked to the forming tube included in the machine of the present invention.

[0024] The forming tubes are usually smooth, a feature that significantly increases friction with the film, especially in environments where there is high humidity and the presence of water or liquids such as dairy environments, for example. The strong friction between the film and the forming tube could create problems in sliding the film along the tube, with consequent problems in sliding and relative difficulty in making a straight package.

[0025] Some manufacturers have tried to reduce this friction by applying Teflon to the outer surface of the tube, but this tends to wear out or come off over time and re-present the sliding problem as well as the very serious risk of Teflon (which is carcinogenic) residues inside the closed packages, together with the very serious damage to the image for the food producer should this happen. To reduce the friction effect due to humidity, some manufacturers have created perforated belts with a vacuum system so that the film could slide freely without being pressed against the forming tube. However, the presence of a suction system on the film could collect liquids, powders, etc., clogging the nozzles and requiring continuous maintenance.

[0026] The forming tube is suitable for inserting the product inside the package but, in the dairy sector, governing liquid is often added to preserve the quality of the product.

[0027] Normally this tube (which can also be used to inject gas in a modified atmosphere) is located inside the forming tube as in order to inject liquids or gases, the nozzle must be inside the film tube created around the forming tube. However, such internal positioning involves considerable difficulties in sanitizing the tube. In fact, the interspaces between the small tube and the inner wall of the forming tube are very narrow and not easily reachable by washing systems, also given the considerable length of the forming tubes. In fact, the bacterial load accumulated during the production shifts behind these tubes has a very negative influence on the shelf life of the product by contaminating it.

Description of the invention

[0028] According to the present invention, a vertical packaging machine with a front or back clipping system is provided which effectively solves the above drawbacks.

[0029] The subject invention comprises a reel holder shaft adapted to carry out a lateral translation movement which, due to the use of two common photocells, is capable of carrying out a self-alignment of the film as it is unrolled.

[0030] Once aligned, said film is moved along a forming tube comprising two collars.

[0031] The film overlaps along the forming tube which, by means of a common vertical sealing bar, is sealed to form a first cylindrical bag ready to house the product.

[0032] Said forming tube has a smooth or polygonal shape, composed of a set of consecutive segments, in order to reduce the friction between the forming tube and the film that slides around it.

[0033] At least two belts move the film just welded by virtue of two belts of rubbery material that facilitate the sliding thereof without damaging it.

[0034] In the machine of the present invention, the liquid or gas is inserted by a small tube which slides externally to said forming tube, in a dedicated recess.

[0035] The external position of said tube facilitates the sanitization of the forming tube inside because it is perfectly smooth, with common pipe cleaners and on the outside because it can be easily reached at all points along the entire length of the forming tube with considerable advantages:

• product contamination is prevented and shelf life is consequently increased;
• the sanitization quality of the forming tube is facilitated over time, in terms of methods and effectiveness.

[0036] Once the film has been sealed vertically, it is ready to be sealed horizontally and cut, creating a plurality of flexible packages (bag, cushion, tuft).

[0037] The machine can work in at least two modes:

• as a traditional vertical packaging machine, creating the cushion package using only the lower cut/sew jaw;
• by selecting the tufted package from the operator panel, the two jaws (upper and lower) work together or alternately depending on the type of package desired, alternating the point where the sealing takes place along the film tube that slides downwards, synchronized with the clipper that positions the clip at each cycle simultaneously with the horizontal welds carried out by the two jaws.

[0038] The clipper is installed below said jaws and is adapted to apply a different type of clip (metal, plastic, ultrasound, adhesive tape or the like) above the central seal.

[0039] Said clip is adapted to tighten the central part of the package, imparting the shape of the tuft to the lower part of the bag.

[0040] By way of non-limiting example, said jaws can be removed from the machine by means of an interlocking system that allows easy removal, installation and maintenance thereof, without the use of any specific tool and in the shortest time possible even by inexperienced operators. The invention allows considerable working time to be saved, for example for the cleaning operations of the jaws. Furthermore, in case of breakage, it allows the customer who is provided with a spare part to install it independently without requiring specialized technical intervention with considerable advantages:

• production stops are avoided;
• the intervention times are reduced until they are almost eliminated;
• the cost of the operation is considerably reduced.

[0041] Two tighteners are installed on the outer edge of the clipper and are adapted to tighten the bag before the clip is applied. The part of the bag that is tightened by the two tighteners is called the "neck".

[0042] In an embodiment thereof, said tighteners are driven by an electric motor.

[0043] Two matrices are instead installed so as to slide inside said tighteners and have the purpose of applying the clip to the package neck. The shape of said matrices allows them to shape the clip around the neck of the bag.

[0044] One of the two matrices comprises a movable knife, an essential component in the clipping machine since, in collaboration with the fixed knife, it is adapted to divide the clip from the rest of the tape wound around the reel.

[0045] By virtue of said movable knife, it is possible to create a clip of the length desired by the customer.

[0046] The previously mentioned fixed knife, on the other hand, is constrained to the milled structure of the machine, in an embodiment thereof. Said forced interlocking prevents any possible error during the installation step, which would cause a generic malfunction of the clipper.

[0047] Said fixed knife, during clipping, cuts the unrolled tape inside the reel with a blade. The blade of the fixed knife is approached by the blade of the movable knife, thus cutting the portion of tape useful for forming the clip.

[0048] In a preferred embodiment of the clipper, a single piston is adapted to move the matrices by exploiting a plurality of telescopic transmissions. In order to apply the clip correctly on the packages, said matrices must be synchronized with the movement of the tighteners.

[0049] By virtue of the use of a single piston, the clipper does not require the numerous calibration steps that were previously necessary to perfectly synchronize all the components in order to perform the clipping.

[0050] Telescopic transmissions, on the other hand, comprise a plurality of rods having threaded ends. Said threads make it possible to slightly modify the length of the rods in order to perform a quick calibration of the machine during the first operating steps.

[0051] A plurality of cams is installed on the milled structure of the clipper and is adapted to transmit the movement between the transmission rods, reversing the direction of motion. Said piston, in one embodiment of the clipper, can be replaced by a brushless motor, in order to optimize the performance of the machinery.

[0052] The welding of the jaws takes place by means of a plurality of electrical resistances and a plurality of temperature reading thermocouples which are powered by a single pin (one for each jaw) installed inside the jaw itself, which is automatically engaged with the assembly of the jaw in its seat.

[0053] Said pin is adapted to allow quick and effective installation and removal of the jaws during the replacement and maintenance steps and connects both the resistance that heats the jaw and the thermocouple that regulates the temperature thereof as it is connected to the control display.

[0054] The height of the clipper can be adjusted by using a crank with gyroscope which, by virtue of a plurality of gears, is adapted to provide a manual adjustment to establish the height at which to perform the clipping, increasing or decreasing the volume of the bag and the size of the relative tuft. This feature allows the user to have the freedom to modify the height dimensions of the packages as desired, which allow varying the weight of the product to be sold or modifying the height at which the clip must be applied and consequently the height of the tuft by simply pushing a button.

[0055] In one embodiment thereof, said height adjustment of the clipper is carried out by a servo motorized system which makes it automatic and controlled from the panel.

[0056] The advantages offered by the present invention are clear in the light of the above description and will be even more apparent from the accompanying figures and the detailed description.

Description of the figures

[0057] The invention will hereinafter be described in at least a preferred embodiment thereof by way of non-limiting example with the aid of the accompanying figures, in which:

• FIGURE 1 shows a front view of the present invention. In the front view it is easy to identify the forming tube 10 with the collars 19 thereof, adapted to guide the film 23 along the sealing line where, after the sealing bar 12, the film 23 encounters the upper jaw 13 adapted to seal and close the package. A further jaw, defined as the lower jaw 14, is adapted to seal and cut the package just created. At least two belts 18 are adapted to allow the sliding of the film 23 during the steps of creation of the package. A small tube 24 is adapted to insert the governing liquid inside the bag just created. Said small tube 24 is inserted inside an external recess of the forming tube 10 so as not to hinder the sliding of the film 23. A clipper 16 is installed under the lower jaw 14 which, due to an attached reel 15, is adapted to insert a clip into the central seal of each package, forming a tuft shape, typical of dairy products. A crank 17 is adapted to provide manual adjustment of the height of the clipper 16. Finally, in this view it is evident the installation of a digital display 11 adapted to allow the display of the operating status of the machine for any operator and to set the working conditions for each desired package.
• Figure 2 shows a lateral view of the subject machine. In the present view it is possible to note the presence of at least a motor 22 which moves the upper jaws 13 and lower jaws 14 respectively independently. The reel holder shaft 21 which comprises the film 23 before it is subjected to the sealing process can be further seen. Said film 23 is aligned by means of a plurality of lateral movements which the reel holder shaft 21 can carry out in total autonomy after having received the commands from the photocells 20.
• FIGURE 3 shows, specifically, the quick release system by means of the jaw fittings which is the same in both jaws 13 and 14. Said jaws 13, 14 further comprise a pin 25 adapted to power the electric resistances 26 during the welding steps of the film 23. The pin 25 is used to facilitate the removal and installation of the jaws 13, 14 during the maintenance and replacement steps with a plug and play system. The figure shows that the removable jaw can be removed (Figure 3a) and inserted (Figure 3b) with a simple drawer movement.
• FIGURE 4 shows an overall external view of the clipper included in the subject machine. In this case, the piston 50 is open, therefore it pushes all the components of the system by means of a plurality of telescopic transmissions 52. Said telescopic transmissions 52 comprise a plurality of rods or bars with threaded ends, in order to facilitate the adjustment of the length of the latter. A plurality of cams 51 are adapted to transmit the movement performed by the piston 50, modifying the direction of motion. The piston 50 activates the two matrices 53, thus closing the clip on the previously prepared bag. A reel 55 is installed inside the present clipping machine and is adapted to constantly distribute the material which is used to create the clip. The reel 55 comprises inside a roll of plastic or aluminum material. All the components of the subject clipper are engaged on a milled structure 58 which constrains the position thereof, reducing any possibility of positioning error during the assembly step.
• FIGURE 5 shows more specifically what happens during the closure of the matrices 53, due to the opening of the piston 50. Said matrices 53 are adapted to apply the clip on the bag, modeling the shape thereof. The two tighteners 56 are adapted to compress the center of the bag, reducing the neck thereof. One of the two matrices 53 comprises a movable knife 57 which, in collaboration with the fixed knife 54, is adapted to cut the tape of the reel 55 to obtain a piece which will be modeled on the constricted neck of the bag in the form of a clip to create the tuft effect.

Detailed description of the invention

[0058] The present invention will now be described purely by way of non-limiting or binding example with the aid of the figures, which illustrate some embodiments relative to the present inventive concept.

[0059] With reference to FIG. 1, the vertical packaging machine with system for front or back clipping is shown.

[0060] A forming tube 10 is adapted to convey the film 23, through the use of two suitable collars 19, inside the process of sealing and forming the package.

[0061] Two belts 18 are adapted to facilitate the sliding of said film 23 while it slides along the forming tube 10.

[0062] In the meantime, a vertical sealing bar 12 seals the two edges of the film 23 creating a first cylinder shape of the package. Said bar can weld intermittently or continuously according to the preferences.

[0063] Once the film 23 has been joined vertically, it encounters an upper jaw 13 and a lower jaw 14 which are activated synchronously or independently and, coordinated with the interchangeable clipper 16 arranged under them, are adapted to form a multiplicity of types of packages by selecting the program directly from the operator panel touch-screen.

[0064] The clipper 16 is installed below said lower jaw 14 and is adapted to clip the central seal of the package in order to create the "tuft" effect typical of dairy products.

[0065] In an embodiment thereof, said clipper 16 is adjustable in height by means of a crank 17 installed laterally to the subject machine.

[0066] The height of the clipper 16 can be further adjusted by the digital display 11 in a motorized version thereof.

[0067] The clipper 16 can be exchanged with other clipper models with a drawer system for easy removal and insertion.

[0068] A common digital display 11 is adapted to facilitate the display of the operating status of the subject machine and to obtain the control of all the functions of the machine.

[0069] With reference to FIG. 2, the lateral view of the vertical packaging machine is shown.

[0070] A reel holder shaft 21 is adapted to comprise the entire reel of film 23 and, by virtue of a constant lateral movement thereof, is adapted to align the film 23 perfectly and in a completely automatic manner due to the aid of two common photocells 20.

[0071] The jaws 13, 14 are advantageously moved by a plurality of motors 22 which, in an embodiment thereof, can be of the electric brushless or pneumatic type.

[0072] With reference to FIG. 3, the jaws 13, 14 adapted to seal the film 23 are shown. The welding takes place by means of electric resistances 26, powered by a pin 25, included inside the extractable jaw 13, 14.

[0073] One of the numerous advantages of the present invention lies in allowing a simple and quick disassembly of the jaws 13.a, 14.a, 13.b, 14.b, without using any specific tool and without the need to call specialized technicians.

[0074] In FIG. 3 (a) it can be seen how easily the jaw 13a can be dismantled by using a simple pin 25 to disconnect the electric circuit, and by virtue of the system's interlocking mode.

[0075] FIG. 4 shows in more detail the clipper 16 of the type preferably included in the present invention. This is the case in which the piston 50 is completely extracted, therefore open. This movement involves the closure of the matrices 53 which, due to their shape, are adapted to shaping the clip by engaging it on the neck of the previously prepared bag.

[0076] The movement of the matrices 53 starts from the piston 50 and is transmitted through the use of a plurality of telescopic transmissions 52 and through the use of a plurality of cams 51 adapted to reverse the thrust direction.

[0077] Said telescopic transmissions 52 comprise a plurality of rods or bars of metallic material, having threaded ends.

[0078] Said thread allows rapid adjustment of the lengths of the telescopic transmissions 52 and facilitates the calibration thereof after the first assembly.

[0079] A reel 55 is installed to comprise inside it the material needed to create the clip. The reel 55 may contain a roll of plastic or aluminum material.

[0080] Finally, in FIG. 4, the fixed knife 54 is clearly visible, which is adapted to cut the tape included inside the reel 55 creating a clip of the required size.

[0081] The position of the fixed knife 54 is forced by a grooved joint in the structure 58 of the machine. This interlocking reduces any possibility of component coupling errors during the assembly step, which is essential for the correct functioning and duration of the clipper. With reference to FIG. 5, the details relating to the closure of the clip in the clipper 16 are shown.

[0082] In particular, the tighteners 56 are operated by an electric motor or by pistons in order to tighten the package in the central part, creating a neck of the bag making it easy to apply the clip.

[0083] Said tighteners 56 must work in synchrony with the matrices 53 to carry out a correct clipping. One of the matrices 53 consists of a movable knife 57 which, by exploiting its blade and its constant movement, is adapted to cut the tape of foil contained inside the reel 55, thus creating a clip of the required size.

[0084] Said movable knife 57 works in collaboration with said fixed knife 54, engaged and constrained on the milled structure 58 of the subject machine.

[0085] Finally, it is clear that modifications, additions or variants that are obvious to a person skilled in the art can be made to the invention described so far, without thereby departing from the scope of protection provided by the appended claims.

Claims

1. Vertical packaging machine with system for front or back clipping characterized in that it is adapted to package the products by means of a closure defined "tuft", due to the use of at least two jaws (13, 14), and a height-adjustable clipper (16), depending on the volume required for the package or on the height of the tuft; said system comprising:

- at least a reel holder shaft (21), installed behind said machine, adapted to self-align the film (23) contained in the reel, by means of a lateral translation movement;

- at least two photocells (20) adapted to verify that said film (23), unrolled from the reel, is correctly aligned with the forming tube;

- at least a forming tube (10), comprising two collars (19), adapted to facilitate the assembly of the film (23), creating a first vertical sealing on the package, by means of a common vertical sealing bar (12);

- at least a small tube (24), installed outside said forming tube (10), adapted to insert governing liquid or any other liquid or gas within the package;

- at least two belts (18) adapted to facilitate the sliding of said film (23) along the forming tube (10);

- at least a brushless motor adapted to move said belts (18);

- at least an upper jaw (13), installed below said forming tube (10), adapted to seal one side of the package;

- at least a lower jaw (14), installed below said upper jaw (13), adapted to seal and separate the completed package;

- at least a clipper (16), installed below said lower jaw (14), adapted to apply a clip on the package sealed with the product in order to create the "tuft" effect;

- at least a clip reel or loader (15) adapted to unroll the material necessary for the clipper (16) in order to carry out the closures of the clips on the package;

- at least a pair of brushless motors or pistons (22), each of which adapted to move one of said jaws (13, 14);

- at least a digital display (11), installed outside said machine, communicating by means of a plurality of connections via cable, adapted to show the operating state of the machine and to clarify for the operator the turn-on and turn-off commands and management of every single function of the machine; said digital display (11) also allowing the selection of the type of package desired between a "tuft" packaging or a cushion or bag packaging.

2. Vertical packaging machine with system for front or back clipping, according to the preceding claim 1, characterized in that said machine is adapted to execute a "tuft" packaging by carrying out the clipping before or after the product is inserted within the package, preventing the accumulation of liquids within the tuft.

3. Vertical packaging machine with system for front or back clipping, according to the preceding claim 2, characterized in that said machine is adapted to execute a "tuft" packaging by applying said clip both with upright package, with tuft directed upward, with use of a single jaw, and by means of tuft directed downward by means of the use of two jaws (13, 14) simultaneously with the application of clip by means of said clipper (16) which works at the same time.

4. Vertical packaging machine with system for front or back clipping, according to the preceding claim 11, characterized in that the sealing system can make packages with open or sealed tuft depending on the requirements.

5. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims, characterized in that said clipper (16) can be manually or automatically height-adjustable, by means of the adjustment of a crank (17) positioned laterally with respect to said machine or by means of a motor controlled by said digital display (11).

6. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims, characterized in that said upper (13) and lower (14) jaws are substitutable due to a drawer mechanism with automatic electrical insertion which allows an easy extraction thereof without the aid of any specific tool.

7. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims, characterized in that said clipper (16) is adapted to carry out a clipping by using an aluminum or plastic clip or by using a common adhesive tape.

8. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims, characterized in that said clipper (16) can be substituted due to a drawer composition that allows an easy extraction thereof from the machine by following the suitable fitting guides.

9. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims, characterized in that said forming tube (10) has a polygonal shape adapted to facilitate the sliding of the film (23) even in the event in which there are condensation phenomena due to humidity.

10. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims, characterized in that said forming tube (10) has a polygonal shape with at least an external slot in order to allow the dosage of liquid or gas within the package, preventing the risk of contamination of the product and facilitating the sanitization of the tube itself due to the positioning of the small metering tubes outside the forming tube.

11. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims, characterized in that said jaws (13, 14) comprise a pin (25) adapted to facilitate the connection and disconnection of the current that power supplies the electric resistances (26), rendering the substitution of the jaws (13, 14) more practical and simpler.

12. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims, characterized in that said clipper (16) comprises multiple synchronized motors for moving the plurality of transmissions that carry out the functions requested for the clipper (16).

13. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims, characterized in that said clipper (16) comprises:

- at least a reel (55) of material intended to be treated in order to carry out the clipping;

- two tighteners (56) adapted to squeeze the central part of the package, creating a thin neck, so as to facilitate the application of the clip;

- two matrices (53), installed below said tighteners (56), adapted to apply the clip, already cut from the roll comprised within the reel (55); the two matrices (53) being adapted to enclose the clip around the neck of the package, possessing a shape that facilitates the modeling of such clip;

- at least a movable knife (57), comprised within one of the two matrices (53), comprising a blade adapted to cut the strip contained within the reel (55) so as to create a clip with the desired size;

- at least a fixed knife (54), installed and fixed on the milled structure (58) of the clipper machine, comprising a blade adapted to cut, in collaboration with said movable knife (57), the strip comprised within the reel (55), thus creating a clip that is ready to be applied;

- only one piston (50) adapted to drive the plurality of components comprised within the present clipper machine; said piston (50) driving the two matrices (53) by exploiting the transmission of the motion of a plurality of telescopic transmissions (52);

- a plurality of telescopic transmissions (52) which comprise rods threaded at the ends, so as to facilitate the calibration of the machine, slightly modifying the length of said telescopic transmissions (52);

- a plurality of cams (51) adapted to transmit the movement between the transmission rods, reversing the direction of the motion;

- a milled structure (58) of the clipper machine, adapted to provide a support structure for the components comprised within the present machine.

14. Vertical packaging machine with system for front or back clipping, according to the preceding claim 11, characterized in that said tighteners (56) of said clipper (16) can be moved by a normal or brushless electric motor in order to obtain high performances suitable for various production needs.

15. Vertical packaging machine with system for front or back clipping, according to the preceding claim 11 or 12, characterized in that an electric motor of brushless type is employed for moving the matrices (53) and driving all the components of the clipper (16) by means of telescopic transmissions (52).

16. Vertical packaging machine with system for front or back clipping, according to any one of the preceding claims from 11 onward, characterized in that said fixed knife (54) is employed with the milled structure (58) of the clipper (16) by means of a fitting which allows only one possible position thereof, thus eliminating any possible installation error.

Drawing