Method and device for packaging products in generically tubular sheaths

Abstract: A method for sequentially packaging products, such as for example sausagemeat, soft meat or the like, in which a delivery outlet (11) introduces a product into a continuous sheath (13) fed peripherally to the outlet, comprises the steps of: discharging a product into the sheath (13); constricting the sheath by means of constricting means (18), in a first position between the product delivery outlet; moving the first constricting position towards the product to stretch the segment of sheath over the product and compact it; constricting the sheath in a second position, by means of second constricting means (17), between the first position and the delivery outlet (11); sealing the sheath between the first and second position by means of a sealing head (23).

Description: There are known machines which pack products such as meat, sausage meat or the like into segments of a tubular sheath such as animal or artificial gut, omentum, etc. In these machines there are various problems which occur when filling the segment of sheath, sealing the ends and separating it from the rest of the continuous tubular element. In fact, first and foremost it must be properly filled both in terms of quantity and in terms of compression. Moreover, care must be taken to ensure that the contents of the segment are not squeezed out when the sheath is being sealed. The machines of known technique solve these problems either partially and unsatisfactorily or in an excessively complicated way. In the first case, the resulting products are not wholly satisfactory, and in the second case the machines are too expensive both to purchase and to service. The general scope of this invention is to obviate the aforementioned problems by providing a method and a machine according to such method for packaging products such as soft meat, sausage meat or the like, in which the resulting package is always perfect with regard both to the seal and to the quantity and compression of the product, all of which is achieved by means of an easy to operate and reliable mechanism. This scope is achieved according to the invention by providing a method for sequential packaging of products, such as sausage meat, meat or the like, in which a delivery outlet introduces a product into a generically tubular continuous sheath fed peripherally to the outlet, sealing means sealing the sheath in a first area before delivery of a product and in a second area after delivery of a product to isolate said product in a segment of the sheath, characterized by the fact of comprising, between the steps of delivering a product and the step of sealing the sheath in the second area, the further steps of constricting the sheath in a first position between the product inside it and the delivery outlet; shifting the first constricting position towards the product so as to pull the segment of sheath over the product and compact it; constrict the sheath in a second position between the first position and the delivery outlet, said second area being delimited by the first and second position. According to said method a machine is provided for sequential packaging of soft products, such as sausage meat, soft meat or the like, in which a delivery outlet introduces a product into a generically tubular continuous sheath fed peripherally to the outlet, sealing means being operated to seal the sheath in a first area before delivery of a product and in a second area after delivery of a product to isolate said product in a segment of the sheath, characterized by the fact of comprising first constricting means for constricting the sheath in a first position between the product inside it and the delivery outlet; said first means being movable to slide along the sheath from a simple constricting position to a thrust position in which pressure is exerted on the product through the constricted portion of the sheath in order to stretch the segment of the sheath over the product and compact it; second means for constricting the sheath in a second position between the first position and the delivery outlet; said second area being delimited by first and second position. The innovatory principles of this invention and its advantages with respect to the known technique will be more clearly evident from the following description of a possible exemplificative embodiment applying such principles, with reference to the accompanying drawings, in which: figure 1 shows a schematic partial plan view of a packaging machine according to the invention; figure 2 shows a view along the line II-II of figure 1; figures 3 to 8 show a schematic representation of the operating steps of the machine of figure 1. With reference to the figures, a packaging machine, made according to the invention and generically indicated by reference 10, comprises a mould duct 11 from which is expelled, by means of a piston 12, the soft product to be packed in a flexible sheath 13 fed by a tubular guiding element 14 coaxial to the duct 11. The sheath 13 can be made of elastic or non-elastic net, animal or artificial gut, etc., or combinations of different elements, such as for example a net wrapped round gut, depending upon the type of product to be packaged. Disposed at the outlet of the duct 11 is a conveyor belt 15 for discharging a packaged product. Also disposed at the outlet of the duct 11 are jaw-type elements 16, 17 and 18, each composed of pairs of jaws which are movable pincer-fashion in planes perpendicular to the axis of the duct 11. Also provided at the side of the jaws is a known sealing device 23. As can be more clearly seen in figure 2, the jaws 16 (shown in their closed position) define between them a slot 19. The jaws 16 and the jaws 18 are supported by a slide 20 sliding, in the direction of flow of the product from the duct 11, on a support 21 integral with the machine. The jaws 17 are fixedly supported by means of a support. As can be seen in figure 2, the closing direction of the jaws 17, 18 is substantially at right angles with respect to the closing direction of the jaws 16. The carriage 20 and all the pairs of jaws are movable by means of controlled actuating means, such as for example electric, pneumatic actuators, etc., easily imaginable by any technician and therefore not further described, which are advantageously controlled automatically by means of known electronic, mechanical or electromechanical sequential means. The machine also comprises other elements, such as magazines and continuous feeders for feeding the sheath 13 and the product to be packed, which being of known types and therefore known by the technician are neither shown nor described in detail. With reference to the schematic figures 3-8, a description is given hereunder of an operating cycle of the machine 10. Figure 3 shows the first step of filling the leading segment of the continuous sheath 13, sealed at the end by a fastener 24. During this step the piston 12 pushes the product 25 (fed into the mould duct 11 by known means) into the closed segment which is fed by degrees by the tubular element 14. The product can consist for example of pieces of meat, a mixture for dressed pork products, or similar types of sausages. Once the piston 12 has reached the end of its stroke it retreats into the duct 11 while the jaws 16 are made to close over the sheath 13. Generically, these jaws hold the product in the segment of sheath even if a small quantity of it should remain trapped in the slot 19 without being separated from the main mass. This condition is shown in figure 4. As can be seen in figure 5, at this point the jaws 18 are made to close thereby throttling the sheath 13 close to the outlet of the duct 11 at a point where the sheath is almost certainly empty since the product 25 is detained by the jaws 16. At this point the carriage 20 is made to move forward in the direction of the arrow shown in figure 6, so that the jaws 18 compress the product while the sheath 13 is pulled taut. When the product is fully compacted and the segment of the sheath containing it is stretched to the desired degree, the jaws 17 are closed so as to define a narrowed area of the sheath as shown in figure 7. This area is shifted towards the fastening head which seals it with two fasteners 24' and 24'' and cuts the sheath between them. As can be seen in figure 8, it is thus possible to seal the filled segment of the sheath, which is removed by means of the conveyor belt 15, and to form the sealed end for the subsequent filling cycle, which starts again from the condition of figure 1. At this point it will be clear that the intended scopes are achieved. The combination of pairs of jaws and their reciprocal movement ensure that the compressing and filling are carried out to perfection, while at the same time preventing the product from partially oozing from the fastener and preventing the possibility of residues of product between the two fastenings on either side of the cutting point between segments of the sheath. The foregoing description of an embodiment applying the innovatory principles of this invention is obviously given by way of example in order to illustrate such innovatory principles and should not therefore be understood as a limitation to the sphere of the invention claimed herein. For example, the shape of the jaws and the support for their reciprocal movement can differ from those shown schematically.

Claims: Method for sequential packaging of products, such as sausagemeat, meat or the like, in which a delivery outlet introduces a product into a generically tubular continuous sheath fed peripherally to the outlet, sealing means sealing the sheath in a first area before delivery of a product and in a second area after delivery of a product to isolate said product in a segment of the sheath, characterized by the fact of comprising, between the steps of delivering a product and the step of sealing the sheath in the second area, the further steps of constricting the sheath in a first position between the product inside it and the delivery outlet; shifting the first constricting position towards the product so as to stretch the segment of sheath over the product and compact it; constrict the sheath in a second position between the first position and the delivery outlet, said second area being delimited by the first and second position. Method as claimed in claim 1, characterized by the fact of comprising the step of delivering the product and the step of constricting the sheath in the first position, and the further step of constricting the sheath between the first position and the product in order to contain the product substantially within the allotted segment, said constriction being removed after having constricted the sheath in the first position, thereby avoiding residues of product. Method as claimed in claim 1, characterized by the fact that said first and second position delimit also said first area for a product subsequently fed into the sheath. Method as claimed in claim 3, characterized by the fact that between the second area of the product in the segment and the first area of the product subsequently introduced a cut is made to separate the segment containing the product from the rest of the sheath. Machine for sequential packaging of products, such as mixtures for sausages, meat or the like, in which a delivery outlet introduces a product into a generically tubular continuous sheath fed peripherally to the outlet, sealing means being operated to seal the sheath in a first area before delivery of a product and in a second area after delivery of a product to isolate said product in a segment of the sheath, characterized by the fact of comprising first constricting means for constricting the sheath in a first position between the product inside it and the delivery outlet; said first means being movable to slide along the sheath from a simple constricting position to a thrust position in which pressure is exerted on the product through the constricted portion of the sheath in order to stretch the segment of the sheath over the product and compact it; second means for constricting the sheath in a second position between the first position and the delivery outlet; said second area being delimited by first and second position. Machine as claimed in claim 5, characterized by the fact of comprising third constricting means for constricting the sheath between the first position and the product in order to contain the product substantially within the allotted segment, said means being operated before operating the first means and being released immediately after they are operated in order to prevent any product from entering the first position. Machine as claimed in claim 5, characterized by the fact that the first and second positions delimit also said first area for a product subsequently fed into the sheath. Machine as claimed in claim 7, characterized by the fact that cutting means are operated between the second area of the product in the segment and the first area of the product subsequently introduced in order to separate the segment containing the product from the rest of the sheath. Machine as claimed in claim 5, characterized by the fact that the first constricting means comprise a first pair of elements which are made to close over the sheath with a pincer movement, said pair of elements being supported by a carriage movable along the length of the sheath from said simple constricting position to said thrust position. Machine as claimed in claim 5, characterized by the fact that the second constricting means comprise a second pair of elements which are made to close over the sheath with a pincer movement. Machine as claimed in claim 6, characterized by the fact that the third constricting means comprise a third pair of elements which are made to close over the sheath with a pincer movement. Machine as claimed in claim 11, characterized by the fact that in the closed position the elements of the pair form at least one spaced apart central area to define a narrow passage for the sheath. Machine as claimed in claim 5, characterized by the fact that the sealing means comprise a fastening head. Machine as claimed in claims 9, 10, 11, characterized by the fact that the elements of the first and second pair close in a direction substantially at right angles to the direction of closure of the elements of the third pair. Machine as claimed in claim 5, characterized by the fact that that the delivery outlet comprises a duct with a piston which sequentially ejects the products from the latter. Machine as claimed in claim 5, characterized by the fact that that the products packaged in their respective segments of sheath are removed by means of a conveyor belt. Machine as claimed in claim 5, characterized by the fact that that the sheath is fed from a tubular element coaxial to the delivery outlet.

Inventors: POSSENTI GIOVAN BATTISTA, POSSENTI, GIOVAN BATTISTA
Applicants: POSSENTI GIOVAN BATTISTA, POSSENTI, GIOVAN BATTISTA
Application year: 1992
Main classification: A22C11
IPC codes: A22C11