CN107848644B - Packaging machine and method for packaging individual or groups of products in packages - Google Patents

Abstract

The present invention describes a kind of for packaging the product in by from the machine in the tubular wrapping for the thermoplastic material that the continuous film that spool is unwound obtains, the machine is equipped with double transversal heat seal and intermediate cutting assembly (13), it is with horizontal translating movement, the unloading of the package of end thereafter is closed along with component (13), the front end of the tubular wrapping of next package is closed simultaneously, pressurizer and reversed pressurizer (63 also due to thereon are heated seal with cutting assembly (13), 163, 63', it 163') and from pipe is formed and longitudinal heat seal mandrel (1) extracts next package, and next package is separated using transverse cuts from the package of upstream by said modules (13).At the end of its active movement, transverse heat seal and cutting assembly (13) are opened, and it is having been filled with and prepare at rear end heat seal and the new package along with unloading upstream, along with it is previous move opposite direction and speed than it is previous move high horizontal movement back to circulation starting position.Transverse heat seal and cutting assembly (13) are assisted by conveyer (41), the conveyer supports and promotes the package and completion formed and isolated package, and equipped with the gap (40) with geometry-variable, which opens during the active horizontal movement of said modules (13) and closes during the reversed horizontal movement of said modules (13).

Description

Packaging machine and method for packaging individual or groups of products in packages

technical field

The invention relates to a machine for packaging individual or grouped and/or stacked products, especially paper or nonwoven products, for sanitary or other purposes, in packages of thermoplastic material obtained from film unwound from reels , and relates to the method of operation of the machine.

It should be noted that the terms "upstream" and "downstream" used hereinafter relate to the feeding direction of the packages.

Background technique

As the closest prior art to an invention filed in International Classification B65B63/02, patent US4679379 filed in 1983 by the same inventor of the present patent application is cited. This document describes a packaging machine comprising a horizontal hollow mandrel, of the sailor's tie type, fed at one end with a continuous sheet or film of thermoplastic material unrolled from a reel, the other end of which is formed in a tube in which its longitudinal edges are overlapped and heat-sealed and, when conveyed from the above-mentioned mandrel, closed laterally by means of a transversal static assembly which, upon command, executes the previous gussets on opposite sides of the same tubular package, And two transverse heat seals and a middle cut are made on the gusset portion of the above tube to close the tail end of the package filled and formed in the previous cycle to close the front end forming the future package and to combine the completed package with the ongoing The formed packages are separated. Upstream of the tube-forming mandrel for packaging films there is a loading station for the products to be packaged, such as toilet paper rolls, absorbent paper for kitchen or other uses, packaging for napkins or hand towels, also nonwovens, where these products are grouped in together and/or stacked to form bundles that are preferably lightly compressed in the transverse direction, and after this step have a cross-section of shape and width slightly smaller than that of said hollow mandrel on the outside Inner cross-section where the tubular package is slid at the front end, gusseted and closed. At the correct stage, the pusher is activated to eject the bundle from the loading station, slides along the hollow mandrel, and pushes it at its exit against the closed front end of the tubular package so that the The package advances while it exits the hollow mandrel, engaged by the strapping elements, which, due to the previous slight lateral compression experienced in the loading station, expand slightly and engage tightly due to their elastic memory A partial mandrel that ejects from the tube and is supported by the conveyor below. The push rod terminates its active movement downstream of the mandrel and is in the open position slightly downstream of the transverse heat seal cutting assembly, then said push rod reverses motion and returns to the cycle start position to release the loading station and allow a new cycle to be repeated operating cycle. Sequentially, the lateral insertion device of the tubular package portion located between the trailing end of the bag bundle and the discharge port of the tube forming mandrel is activated, followed by activation of the transverse heat sealing and cutting assembly, closing the rear end of the filled package , which closes the front end of the package being formed to be filled, the assembly is then opened slightly to release the heat seal and allow the optional blower cooling device to act on it. The same assembly is opened in sequence to allow a new cycle of operation to be repeated, The produced package is removed by a conveyor that supports it. When repeating a new operating cycle, said transverse heat-seal cutting assembly must be fully opened to allow the tubular package to be advanced by the product inserted therein through the pusher, which performs its active operative movement. To prevent the heat seal of the front end of the tubular package from yielding under the thrust of the product during the bagging step, and thus prevent the package from tearing and breaking, but also due to the air generated when the product is compressed by the product The tubular package is closed longitudinally and at the front end The advances in , in the prior art, can work as follows:

a) prolonging the idle time between one operating cycle and the next in order to ensure effective cooling of the heat seal at the front end of the tubular package;

b) The product is inserted at a slow rate into the forming tubular package and closed at the front to allow air trapped at the front of the package to pass between the product and the package. As with the previous solution, this solution inevitably limits the operating speed of prior art packaging machines and thus the productivity.

Contents of the invention

The present invention aims to overcome these and other limitations of the prior art in order to produce a reliable packaging machine with a high hourly productivity, with a device according to the present invention for packaging individual or groups of products in packages of thermoplastic material The idea of the solution of the packaging machine and its method, the transverse heat-sealing and cutting assembly is provided with pressurizers upstream and downstream of the heat-sealing device to hold the film securely before, during and after the transverse heat-sealing step . In conjunction with said pressurizer, said transverse heat seal cutting assembly is movable in the package forming direction, first closing and moving away from said tube forming mandrel, then opening and returning in the opposite direction to the cycle start position for The subsequent cycle of operation is repeated. Now that tubular packages can be advanced with a press along the tube forming mandrel pulled by the new dual transverse heat sealing and cutting assembly, the following results are possible:

1. As these heat seals are performed at each subsequent forming and filling step of the tubular package while the transverse heat sealing and cutting assembly is closed and moved away from the mandrel, strong pressure is generated in the time required to ensure its proper implementation. and effective heat sealing;

2. When the new tubular package has closed the rear end of the previous cycle's package by means of a presser pulled by the transverse heat sealing and cutting assembly which has sealed the front end of the new package and is accompanied by the unloading of the latter , since the presser downstream of the transverse heat-sealing and cutting assembly mechanically isolates the transverse heat-sealing of the leading end on the new package, the pusher can quickly fill the new package such that the transverse The heat seal is not pressurized due to the insertion of the product into the new tubular package and due to the thrust of the air trapped in said new package and in front of the product, also during this step the push rods can move at a relative speed Inserting the product into the new package at a relative speed that allows a slow and progressive rearward discharge of the air compressed upstream of said product (P) and against the front end of the new package;

3. During its movement away from the tube forming mandrel, the transverse heat sealing and cutting assembly is provided for all the time required to perform its main heat sealing and cutting operations, and during the last part of said movement, there is time for a slight Turn on the heat-sealing machine and allow the action of the means for natural or forced cooling of these heat-seals, while always maintaining the packaging of the packages upstream and downstream by the pressurizer, to prevent even the smallest of the transverse heat-seals stress;

4. The return movement of the transverse heat sealing and cutting assembly to the start of the cycle after it has been opened is overlapped with the return movement at the same speed of the push rod used to package the product, and after this return step, the rear end is filled and ready to close The first package has been positioned downstream of the transverse heat sealing and cutting assembly.

With the new solution according to the invention it is obvious how it is possible to produce a more reliable and faster packaging machine than the prior art.

Description of drawings

Further characteristics of the present invention, and advantages derived therefrom, will become more apparent from the following description of a preferred embodiment thereof, illustrated purely by way of non-limiting example in the eight accompanying drawings, in which:

Figures 1 and 2 are a side view and a top plan view, respectively, of a packaging machine according to the invention;

Figures 3 and 4 are side and front views, respectively, of one side panel of the moving transverse heat sealing and cutting assembly of the packaging machine, with some components cut away;

Figures 5, 5a and 5b are cross-sectional views of a transverse heat sealing and cutting assembly that may be used in a scheme for making a package with a combination handle, the above-mentioned components being shown in an open position, a closed position and a semi-closed position, respectively, with transverse heat sealing Sealing and cutting devices open while external pressurizers remain closed on downstream and upstream packages;

Figure 6 is a perspective view of a package with a handle that can be obtained using the transverse heat sealing and cutting assembly of Figure 5;

Figure 7 shows in an open position and a cross-sectional view a transverse heat sealing and cutting assembly according to a variation of an embodiment for producing a symmetrical heat sealed package with a leading end and a trailing end, without the handle of Figure 6 ;

Figure 8 shows a perspective view of a package without a handle that can be manufactured with the transverse heat sealing and cutting assembly of Figure 7;

Figure 9 shows a schematic plan view of an arrangement of existing lateral gussets of tubular packaging sections periodically joined by a dual transverse heat sealing and cutting assembly;

Figure 10 shows an enlarged and partly cut-away side view of the variable gap area of the conveyor associated with the transverse heat sealing and cutting assembly to support the packages during the subsequent steps of the operating cycle, where the same package The piece is circulated through the gap in which the opposing rods of the transverse heat sealing and cutting assembly operate;

Figures 11 to 16 show schematic side views of the main components of the packaging machine according to the invention in some subsequent and important steps of the operating cycle of these components.

Detailed ways

From Figures 1 and 2 it can be seen how the packaging machine comprises as an intermediate part an axially hollow mandrel 1 in the shape of a sailor's tie with a rectangular or square adjustment when the form of the piece is changed, the longitudinal axis of the axial hollow mandrel is positioned horizontally, the axial hollow mandrel is provided with an open end 101 on the left side when viewing the figure, the film 102 from the reel 2 below from This open end 101 enters and is made to adopt a tubular shape by means of guides of a mandrel, generally in the shape of a sailor's tie, moving longitudinally along said mandrel 1 towards its outlet 201, wherein the longitudinal slices of said film overlap each other and pass through Heat-sealing means 3 of known type heat-seal them successively to each other, so that said film exits from the outlet 201 of mandrel 1 in the form of a bag with a cross-sectional dimension slightly larger than the inner cross-section of said mandrel 1, which The shaft guides and supports the bag externally and its internal lateral surfaces serve instead to guide the product to be packaged. Upstream of the mandrel 1 is provided a known loading station 4, wherein also known means form grouped and/or stacked product bundles from at least any one feed line, not shown , because it is not necessary for understanding the present invention. The loading station 4 can also be adjusted when the format of the packages to be produced changes, and can advantageously be characterized in that the bundle of paper products is subjected to appropriate lateral compression so that when said bundle is ejected longitudinally from the loading station 4 , which can easily enter the hollow mandrel 1 and be able to slide along the hollow mandrel while still being sufficiently laterally compressed.

In FIG. 1 , the dotted line 5 represents the ideal level on which the bottom of the bundle and the packages produced by the packaging machine move. Upstream of the loading station 4 is provided a push rod 6 supported by the front end of a horizontal bar 106 , the longitudinal axis of which is parallel to the common longitudinal axis of the aforementioned stations 1 and 4 and extending to the left when viewing FIGS. 1 and 2 . At the end close to the push rod 6, the rod 106 is longitudinally guided by a rolling device 7 supported by a base plate 8 in the form of a gantry on which is also mounted a gear motor assembly 9 whose vertical The straight output shaft is press-fitted with a toothed pulley 10 which cooperates with a toothed belt 11 guided on a pair of idler pulleys 12 parallel to the pulleys 10 and also Supported by the portal frame 8 so as to carry the aforementioned toothed belt 11 in a path parallel to the rod 106 and be able to be fixed to this rod at the opposite end so as to form the equivalent of a toothed rack fixed longitudinally to the rod 106 and meshed with the pinion 10 so that by rotating the motion unit in one direction or the other, the pusher 6 can be operated to form the mandrel 1 along the tube and for transfer in the loading station 4 downstream of the mandrel and downstream of the transverse heat sealing and cutting assembly Useful movement of the formed bundle (see below) for inserting said bundle into the tubular package formed by said mandrel 1 and longitudinal heat sealing means 3 using the movement indicated by A in FIGS. 1 and 2 . Assembly 9 is equipped with an electric motor that is not only able to rotate in both directions, but also has an electronic speed control to allow operating the push rod 6 in different movements, with correct acceleration and deceleration ramps (see below).

Downstream of the mandrel 1 , at a short distance from its outlet 201 , there is an innovative assembly 13 which performs a double transverse heat-sealing and intermediate cut on the package and, according to the invention, after closing in a vertical plane, The assembly operates first in a horizontal movement away from the aforementioned mandrel 1 in order to accompany the package during the transverse heat sealing and cutting steps, and then, after opening in the vertical plane, translates horizontally in the opposite direction to the previous one, to return to the The initial starting position indicated by the solid line in Figures 1 and 2, to repeat a new cycle of operation, a reciprocating movement B, the length or extent of which will be related to the length of the package to be produced, will therefore be possible changed (see below).

In order to carry out said horizontal translational movement B, also shown in detail in FIGS. Sliding upward, the guide is fixed longitudinally on the inner face of the side panels of a part of the base plate 116 of the packaging machine which extends downstream of a part 16 ( FIG. 2 ) supporting the aforementioned stations 1 , 4 and 6 . Parallel to the pairs of guides 115, between and parallel to these guides 115, the inner side panel of the base plate 106 supports a toothed belt 17 closed in a ring and guided on respective end pulleys 18, of which a pair The end pulleys are interconnected by transverse shafts 19 and in turn connected by forward motion transmission 20 to a motion assembly 21 having an electric motor which rotates in both directions and is preferably of the type with electronic speed and phase control. The two side panels of the carriage 14 capable of rectilinear reciprocating movement within the above range B by the motion assembly 20 are fixed to the upper branches of the two toothed belts 17 by clamps 22 ( FIG. 3 ).

The assembly 13 comprises two mutually parallel and opposite elements 113' and 113", which lie on a common ideal vertical plane transverse to the longitudinal direction of the ideal plane 5 of advance of the package, the lower part 113 of the package ” is positioned below this plane 5 at the start of each cycle, while the upper element 113 ′ is elevated and at a distance from the plane 5 , allowing the packages periodically departing from the mandrel 1 to pass underneath without interference . In an active operating step, the elements 113', 113" are moved towards each other by a self-centring movement on a common ideal vertical plane so as to approximately meet half the height of the package to be closed. In order for the machine to produce package, it is possible to adjust the height position of the supporting and guiding means of said elements 113' and 113" simultaneously without adjusting the relative distance at rest. To this end, as shown in FIGS. 3 and 4 , the support means for said elements 113 ′ and 113 ″ are mounted on respective vertical slides 23 located inside the side panels of the carriage 14 which support these elements with guide means 24 . Slides. Each slide 23 is equipped with a protruding intermediate attachment 123 with a lead screw 125 cooperating with a vertical screw 25 which in turn is connected to a three-way bevel gearbox 27 by inserting a safety coupling 26 , the vertical path of the three-way bevel gearbox acts on the screw 25, while a horizontal path connects the screw 25 of the slider with the screw of the slider on the opposite side, which will act as a two-way bevel gear, while The third horizontal path of the gearbox 27 is connected to a motion assembly 28 with an electric motor that rotates in both directions and is preferably of the type with electronic speed and phase control to allow transverse heat sealing and cutting assembly 13 Automatic or semi-automatic adjustment of height position.

The vertical guide rod 31 is fixed to the inside of the above-mentioned vertical slide 23 by means of supports 29 and 30, which support the slide through the lower end and the middle area respectively, the vertical guide rod has a circular cross-section, inserted into the recirculating ball bearing , the sleeves 32 and 33 slide on this vertical guide rod, the lower part of the sleeve 32 slides between said supports 29, 30 and supports the end of the lower transverse heat sealing and cutting element 113", while The upper sleeve 33 slides over the support 30 of the respective rod 31 and supports the end of the upper transverse heat sealing and cutting element 113'. It can also be seen in Figures 3 and 4 that the sleeve 32 of each rod 31 and 33 are fixed by respective clamps 132, 133 to opposite branches of a toothed belt 34 guided on a pulley 35 and a toothed pulley 36 which is adjustably supported by the upper end of each rod 31, toothed Pulleys 36 are supported by the lower end of each vertical slide 23 and the aforementioned lower pulleys 26 are connected to each other by a synchronizer shaft 37 connected to a kinematic drive with an electric motor by means of a forward motion transmission 38 . assembly 39, the electric motor rotates in both directions and is preferably of the type with electronic speed and phase control. The opposing elements 113' and 113" of the transverse heat sealing and cutting assembly 13 receive the necessary acceleration and The movement of the opening and closing steps of the deceleration ramp is shown below.

As can be seen from FIGS. 1 and 2 and FIGS. 10 to 12, the above-mentioned ideal vertical plane on which the elements 113' and 113" of the transverse heat-seal cutting assembly 13 move is provided with the transverse opening of the upper branch of the conveyor 41. Or gap 40, the above-mentioned upper branch moves in the direction of arrow 42, and during the movement of the package away from the mandrel, it is located on the horizontal operating panel 5 to support the package during the process of leaving the mandrel 1, while the rear and front ends Transverse heat sealing and intermediate cutting are performed dynamically on the above-mentioned packages (see below). When at rest the elements 113', 113" of the assembly 13 are in the open position and must perform a return movement to be placed in a new position unloaded from the mandrel 1. upstream of the package (see below), it must be possible to substantially close said transverse gap 40 to allow this new package to pass through it. To this end, the upper branch of the conveyor 41 is guided on rollers 43 located at the exit of the mandrel 1 , which rollers are supported in rotation together with the end rollers 143 by the side panels of the base plate 116 of the packaging machine. Instead, the lower branch of the conveyor 41 is guided on idler rollers 44 , on at least one idler roller 44 ′ and on a toothed pulley 45 press-fitted onto the slow output shaft of the movement assembly 46 . At a short distance from the upper roller 43, the upper branch of the conveyor 41 is guided on a roller 47 parallel to the roller 43 and at the above-mentioned height, then on three lower rollers 48, 49 also parallel to each other, idling and parallel to the roller 47 and 50, and thereby cause the above-mentioned upper branch of the conveyor 41 to form said gap 40 in which the lower element 113" of the transverse heat sealing and cutting assembly 13" can be positioned in its lowered rest position , and the above-mentioned element 113" can be lifted through this gap on command to cooperate with the upper element 113'. The rollers 47 to 50 are rotatably supported by the carriage 14 and move together with the carriage. Roller 50 is located at a lower level than roller 47 so that two idler rollers 51 and 52 positioned respectively downstream and upstream of said roller 50 and the latter at the same height as roller 47 can be placed above said roller 50 . Passing rollers 50, 51 and 52, conveyor belt 41 follows a meandering path. The rollers 51 and 52 are rotatably mounted on a small auxiliary carriage 53 which is mounted on the main carriage 14 and which is capable of performing on command a controlled horizontal movement on the main carriage which makes the aforementioned rollers 51 and 52 move from the motion return position of Figure 11 to the extended position of Figure 12, in the motion return position gap 40 is substantially closed and packages can easily pass over rollers 47 and 52, in the extended position gap 49 Open to allow freedom of movement in the vertical direction of the lower element 113 ″ of the transverse heat sealing and cutting assembly 13 .

As can be seen from the detail in Figure 10, the rollers 51, 52 are mounted transversely on opposite ends of said auxiliary carriage 53, laterally equipped with horizontal and longitudinal guides 153 sliding on slides 54 fixed on On top of the cross member 55 , which in turn is fastened with its ends to the side panels of the main carriage 14 . The cross member 55 rotatably and cantileverly supports a pair of screw rods 56, parallel to each other, parallel to the guide 54 and a lead screw 156 integral with an attachment 253 of the auxiliary carriage 53, which is connected to the These screws 56 cooperate. Two screw rods 56 (only one of which can be seen in FIG. 10 ) are operated by means of a forward motion transmission 57 through a motion assembly 58 flange-mounted to the cross member 55 and operated by an electric motor which The motor rotates in both directions and optionally also has electronic phase control.

In FIG. 10 , the auxiliary carriage 53 with rollers 51 and 52 is shown in solid lines in an extended position closing the gap 40 and in dashed lines in a kinematic return position opening said gap 40 . This figure clearly shows how the rollers 51 and 52 perform the same range of motion D, and such that when the roller 52 moves back to the left (when looking at FIG. 10 ) and results in a double shortening D of the upper part of the conveyor 41, the lower part The rollers 51 also move to the left and cause a double lengthening D of the lower part of the above-mentioned conveyor 41, so that the movement of the auxiliary carriage 53 does not change the longitudinal tension of the above-mentioned conveyor 41 and does not change its movement.

As can be seen in Figures 1, 2 and 9, opposite folds 59, 59' are provided on one side of the conveyor 41 and at the transverse heat-sealing and cutting assembly 13, which act before the operation of said assembly 13 from On the sides of the part of the tubular package that the mandrel 1 leaves that is not engaged by the product to be packaged (see below) and that will be engaged by the above assembly 13, to create a concave side gusset on this part of the margin, this is important for It is useful to prevent the heat seal area from protruding laterally from the package and to ensure that this area tightly wraps the ends of the packaged product. The folds 59, 59' may be adjustably mounted on respective slides 60, 60' which slide on guides 61, 61' constrained to a fixed frame 116 of the packaging machine, said slides 60 , 60' are operated by corresponding fluid pressure piston cylinder assemblies 62, 62' or by other suitable linear reciprocating actuators.

Referring to Figures 5, 5a and 5b, the composition of the device forming the elements 113' and 113" of the double transverse heat sealing and intermediate cutting assembly 13 will now be described. In Figure 5, the elements 113' and 113" are shown in a position moving towards each other step, and with a greater distance between the above-mentioned elements, corresponds to the rest position of the above-mentioned elements 113', 113" of the assembly. The transverse heat-sealing and cutting assembly described now with reference to FIG. 5 enables the production of The package C1 shown, which is closed longitudinally by the heat seal SL formed by the heat sealing device 3 shown in FIGS. 59' gusseted section F, closed at the front end by a transverse heat seal ST1 and at the rear end by a transverse heat seal ST2, and equipped with the above-mentioned flat and gusseted section M of the package, also longitudinally by a heat seal SL closure, this heat seal SL is closed on the free edge B2 by fusing the material obtained from the separation with subsequent thermal cutting between the packages and is equipped with a C-shaped middle cut G which can be used to seal The above-mentioned part M is used as a handle for carrying the above-mentioned package C1. At the transverse front end seal ST1, the package C1 has a small protruding appendage of the same package parallel to the front edge B1 of ST1 by using the The fusion of the material obtained by the thermal cutting between the separations is closed.

The assembly 13 must be able to simultaneously implement, on its transversally pressed tubular package part, a parallel heat seal ST2 for the package already filled and closed at the rear end, and a parallel heat seal ST2 for the subsequent package to be filled with product. Sealing ST1 , intermediate cut of edges B2 , B1 , and mutual separation of the packages are performed, and punching is carried out to form opening G as a handle.

As can be seen in Figure 5, the upper element 113' of the assembly 13 is equipped at least upstream, but preferably both upstream and downstream, with pressurizers 63, 63', the lower edges of which have a circular profile, both relative to The lower operating surface of the above-mentioned element 113' protrudes downwards and the presser can move back towards this operating surface against the action of the reverse springs 64, 64'. On the lower operating surface of the element 113', in a position disposed coplanarly with each other back from the vertical and horizontal movement of the pressers 63, 63', heat sealing means for implementing the heat seals ST1 and ST2 of FIG. 6 are provided 65 and 66 and thermal cutting means 67 for separating the packages from each other and for forming the fused edges B1 and B2 of the above-mentioned packages of FIG. 6 . In the middle part of the lower operating surface of the element 113' there are two small spring-operated pressers 68, 68', the lower and suitably rounded edges of which are slightly raised from the ideal plane containing the heat-sealing means 65, 68. Projecting downwards, and in a position moved back from these intermediate pressers 68 , 68 ′, there is provided a punching unit 69 for making a cutout G on the handle M of the package C1 of FIG. 6 . The whole assembly 113' is supported by a support member 70 located above which is connected to the sleeve 33 shown in Figures 3 and 4 by means of interposed springs and compensating means 71 which are generally heat-sealed in the transverse direction in question. and cutting device.

The lower element 113" of the assembly 13 as shown in Fig. 3 comprises counter means 163, 163' opposite the pressurizers 63, 63' arranged on a common ideal level, counter means opposite the heat sealing means 65, 66 To the heat sealing device 165 , 166 , the reversing device 167 for the cutting device 67 , the reversing device 168 , 168 ′ for the intermediate presser 68 , 68 ′, and the punch 169 for the upper punching unit 69 . The pressers 63 , 63 ′ and corresponding counter means 163 , 163 are manufactured or machined to have a high coefficient of friction in contact with the film forming the package and exiting from the tube forming mandrel 1 .

As shown in Figure 5, the elements 113' and 113" of the transverse heat sealing and cutting assembly 13 are moved relative to each other parallel to each other, self-centering on a common ideal vertical plane, and the external pressers 63, 163 and 63' First act as shown in Figure 5b, firmly gripping the inserted tubular package (not shown) in the transverse direction, and then continue to move towards each other, the above-mentioned elements 113', 113" reach the state shown in Figure 5a , can be used to produce said heat seals ST1, ST2, intermediate cuts B1-B2 on the package C1 by means of the action in the correct stage of the intermediate presser 68, 168, 68', 168', which is passed through the punching unit The elements of the punches 69 , 169 firmly hold the part of the package provided with the cut G. After said transverse heat sealing and cutting operations have been carried out, as shown in Figure 5b, the elements 113', 113" of the assembly 13 are temporarily taken to a partially open state, while the heat sealing machines 65, 66 and the cutting device 67 are operated by the respective The lower reversing device 165, 166, 167 of the lower reversing device 165, 166, 167 is raised to allow rapid natural or forced cooling to implement heat sealing and transverse cutting, while the package remains clamped in the external presser and reversing presser 63, 163 and 63', 163' so that it can be pulled further by the assembly 13 as shown below.

If the machine is to produce a package C2 as shown in Figure 8, which has no handles but is only equipped with transverse front and rear edges having fused edges B1 and B2 at a short distance from it, resulting from the thermal cutting operation of the package. End heat seals ST1 and ST2, as shown in Figure 7, the transverse heat sealing and cutting assembly 13 will be simplified, wherein the upper element 113' is only equipped with external pressers 63, 63', heat sealers 65, 66 and heat cutting means 67 , while the lower element 113 ″ will carry the reversing means 163 , 163 ′, 165 , 166 , 167 of the aforementioned operating means located above.

In figure 1, numeral 72 denotes a processor which can be programmed through unit 73 and to which all the electric motors of the aforementioned moving assemblies are connected to allow automatic and safe operation of the packaging machine, as now referred to figures 11 to 16 described.

Figure 11 shows the transverse heat sealing and cutting assembly 13, which pre-heat seals the rear end of the finished package C1, heat seals the front end of the new package C1', and performs an intermediate transverse cut to separate the package. C1 is separated from a new package C1', which is moved away by the upper branch of the conveyor 41 moving in the direction 42 to be unloaded, since it was applied by the above assembly 13 in the previous movement to the right when viewing Figure 11 , while also keeping the subsequent package C1' away from the mandrel 1 lying longitudinally, because the above-mentioned new package C1' has been filled by the pusher 6 at the correct stage Motion returns as indicated by the dotted line. The elements 113', 113" of the assembly 13 are spaced apart or open from each other with the lower element 113" in the gap 40 and the upper element 113' in the raised position so as not to interfere with the new package C1'. The gap 40 is closed at this stage to prevent interference when passing under the above-mentioned new package C1 ′, and is arranged upstream of this package C1 ′.

In a subsequent step shown in Figure 12, the auxiliary carriage 53 moves to the right and opens the gap 40 to release the ideal vertical plane on which the elements 113', 113" of the transverse heat sealing and cutting assembly 13 move. In Figure 9 The static folds 59, 59' act laterally on the part of the tubular package 102' between the outlet of the mandrel 1 and the product P inserted into the new package C1' to give this part of the package a lateral After recessing the gusset, in the fully closed state shown in Figure 5a or in the partially closed state shown in Figure 5 or 5b, the elements 113' and 113" of the assembly 13 are commanded to perform a self-centering closing movement, which The closing movement causes these elements to close immediately downstream of the product P packaged in C1 ′ and at half the height of this aforementioned package. At the correct stage of full or partial closure of the elements 113', 113", the lateral folds 59, 59' move back to the rest position and, in sequence, the main carriage 14 carrying the assembly 13 translates to the left. If the assembly 13 Elements 113', 113" are not completely closed, as shown in Figure 5 or Figure 5b, then the initial slow movement of the above-mentioned assembly 13 away from the mandrel 1 and the resistance produced by the tube impinging on the membrane 102 of the tube forming mandrel 1 can make The pack C1' is moved close to the assembly 13 to allow a sufficiently tight pack to be formed also in the longitudinal direction. In turn, as shown in FIG. 5a, the elements 113', 113" of the assembly 13 are closed so as to securely hold the rear end of the package C1' and implement the transverse heat seal ST2 of FIG. The subsequent package C1" of the mandrel 1 is separated (formation of the closing edges B2 and B1 and their separation), the assembly 13 starts to be pulled out and a cold cut G is performed to equip the above-mentioned package C1' with a carrying handle M.

When the assembly 13 moves to the right, as shown in Figure 14, the pusher 6 inserts the product P to be packaged into the future package C1 "in which the above product is due to its The previous transverse compression experienced in the loading station 4 expands transversely and the speed at which the product is inserted into the package C1" is such that the air trapped in this package upstream of the packaged product P slowly escapes downstream. out, without damaging the above-mentioned package C1", which is still firmly held by the pressurizer 63, 163 upstream of the assembly 13, which enters the state shown in Figure 5b at the correct stage to allow rapid cooling by The heat sealing performed by the assembly 13 described above.

It is evident from Fig. 14 that when the assembly 13 dynamically carries out its double transversal heat sealing and cutting operation, it has been specified, while downstream of the assembly a new package already filled with the product P to be packaged is formed (see Fig. 11's start state).

In turn, as shown in Figure 15, when the carriage 14 reaches or is about to reach the end of its movement to the right, the elements 113', 113" of the assembly 13 open, the lower element 113" returns to open the gap 40, and the upper element 113 'arranged at a height higher than the height of the upper part of the package C1".

As shown in Figure 16, following the previous step, the auxiliary carriage 53 moves to the left to close the gap 40, and then the main carriage also translates to the left to return to the cycle start position shown in Figure 1, while passing through the conveyor 41 The active moving part 42 keeps the bottom of the new package C1" lying flat without the slightest interference. The push rod 6 is or has been moved back in the correct phase to repeat the new cycle of operation. The cycle begins with the assembly 13 in the open position The return movement can be carried out very quickly, which further increases the productivity of the packaging machine.

It should be understood that the present description relates to a preferred embodiment of the invention and that numerous variations and modifications may be made thereto without departing from the guiding principles of the invention as described, shown and claimed below.

In the claims, reference signs in parentheses are purely indicative and do not limit the protective scope of these claims.

Claims (10)

1. a kind of for single or groups of product to be packaged in the packing machine in the package of thermoplastic material comprising hollow Horizontal mandrel (1), the continuous film (102) of the thermoplastic material unwound from spool (2) is fed into the loading end of the mandrel (101), the film advances towards the unloading end (201) of the mandrel, and the weight of its longitudinal edge is utilized by apparatus for heat sealing (3) Folded and mutual heat seal and be formed as pipe, and left in the form of tubular wrapping (102') from above-mentioned mandrel (1), the tubulose packet Dress is laterally closed and being located in the transverse heat seal in downstream of above-mentioned mandrel (1) and intermediate cutting assembly (13), logical Two transverse heat seals (ST1, ST2) of implementation and centre on the part of the tubular wrapping of folding part (59,59') gusset is crossed to cut (B1, B2) is cut, is filled and shapes in previous circulation, closes the front end of next package (C1 "), and will complete Package (C1') separated with the package (C1 ") formed, the packing machine be included in the upstream of the mandrel (1) and with The longitudinally-aligned to be packaged, grouping of the mandrel and the load station (4) of product (P) compressed in transverse direction, the loading work The upstream of position (4) includes longitudinally-aligned push rod (6), which will come from the one or more of load station (4) according to order Product (P) is transferred in the tubular package by the mandrel (1) production, and tubular package passes through the whole length of mandrel and surpasses Cross the mandrel, it is characterised in that form the transverse heat seal and centre for implementing double transversal heat seal and intermediate cutting and cut Cut the parallel and opposite element (113', 113 ") of component (13) upstream equipped with corresponding pressurizer (63,63') and reversely Pressurizer (163,163'), to clamp the transverse heat seal and intermediate cutting assembly (13) securely in a lateral direction according to life The part of the package (102') for the gusset closed on it is enabled, the transverse heat seal and intermediate cutting assembly (13) are pacified Mounted in having on the main carriage (14) moved horizontally, which is operated by telecontrol equipment, so as in the correct stage Pipe forming mandrel (1) is moved from, to follow the package of completion in the heat-seal process of rear end and take from mandrel (1) Product (P) is inserted into the new part in the correct stage by the new part of tubular wrapping (102') out, the push rod (6) In, to form the subsequent packet piece installing (C1 "), so that the main carriage (14) is moved towards mandrel (1) and is returned quickly to just The device of beginning position be arranged in have been filled with and at rear end will closed new packing part (C1 ") downstream, be equipped with it is motor-driven Change conveyer (41), with the package formed in the mandrel (1) downstream support, and the top branch of the conveyer (41) exists It is guided in the parallel rollers (47,48,49,50) pivotally supported by the main carriage (14), and is propped up by auxiliary balladeur train (53) It is guided on the other roller (51,52) of support with zig-zag path, the auxiliary balladeur train is according to order on above-mentioned main carriage (14) Level sliding, to form gap (40) at the transverse heat seal and intermediate cutting assembly (13), the transverse heat seal It is usually contained in the gap with the lower element (113 ") of intermediate cutting assembly (13), and the gap (40) passes through institute It states the movement assisted balladeur train (53) in one direction and is opened, to allow when being engaged by the lower element (113 ") The degree of freedom of motion of the lower element (113 ") and above-mentioned gap (40), the gap is by the auxiliary balladeur train (53) in Xiang Fanfang Upward movement and be closed so that the conveyer (41) correctly supports institute during the return movement of the main carriage (14) The package of formation.

2. packing machine according to claim 1, wherein carry the master of the transverse heat seal and intermediate cutting assembly (13) Along sliding part is laterally equipped with, the sliding part slides balladeur train (14) on pairs of straight line and horizontal guide (115), described Pairs of straight line and horizontal guide is longitudinally fixed on the side panel of a part of the substrate (116) of above-mentioned packing machine, and And these side panels support also parallel with the pairs of straight line and horizontal guide (115) and are closed into ring and hold accordingly The toothed belt (17) guided on portion's belt wheel (18), one pair of them end belt wheel by lateral shaft (19) interconnect, the lateral shaft after And connect with the moving parts (20,21) with electric motor, the electric motor rotates in two directions and has electricity Two side panels of sub- speed and phase controlling, main carriage (14) are connected to two toothed belts (17) by fixture (22) Branch, to receive necessary straight reciprocating motion from the branch, which has necessary acceleration and deceleration ramp.

3. packing machine according to claim 1, wherein form the two of the transverse heat seal and intermediate cutting assembly (13) The support device of a parallel and opposite element (113', 113 ") is mounted on corresponding vertical sliding part (23), the vertical cunning Moving part is located in the side panel of main carriage (14), and the side panel supports the vertical sliding part using guide device (24) (23), each vertical sliding part (23) is equipped with intermediate attachments outstanding (123), which has and vertical screw rod (25) The driving screw (125) of cooperation, the vertical screw rod are then connect with three road cone shape gear-boxes (27), which erects Straight path acts on the vertical screw rod (25), and one of horizontal route is by the above-mentioned vertical screw rod of vertical sliding part (23) (25) it is connected to the vertical sliding part (23) of opposite side, this will act as two-way umbrella gear box, while the of the gear-box (27) Three horizontal routes are connected to the moving parts (28) with electric motor, and the electric motor rotates in two directions, and With velocity of electrons and phase controlling, to allow transverse heat seal and centre to cut when the height change of package to be produced Cut the automatically or semi-automatically adjusting of the height and position of component (13).

4. packing machine according to claim 3, which is characterized in that be fixed on the vertical cunning using supporting element (29,30) On the inside of moving part (23) is vertical guiding bar (31), and the supporting element correspondingly supports institute by lower end and intermediate region Vertical sliding part is stated, the vertical guiding bar (31) has circular section, and sleeve (32,33) passes through inserting in circulating ball bearing Enter and slided in the circular section, lower sleeve portion (32) is slided between the supporting element (29,30) and supports lower, transverse The end of heat seal and cutting element (113 "), and upper sleeve (33) is in the upper support element of corresponding vertical guiding bar (31) (30) top is slided and supports the end of upper lateral heat seal and cutting element (113'), each vertical guiding bar (31) Sleeve (32,33) by corresponding fixture (132,133) be fixed to toothed belt (34) opposed branch, the toothed belt by Belt wheel (35) that the upper end of each vertical guiding bar (31) adjustably supports and by each vertical sliding part (23) Lower end support toothed belt (36) on be guided, the toothed belt (36) by synchronizer axis (37) interconnection, The synchronizer axis is then connect with the moving parts (38,39) with electric motor, and the electric motor revolves in both directions Turn, and have velocity of electrons and phase controlling, by with it is necessary acceleration and deceleration ramp it is complete or partial close or The movement that person opens completely or partially is transmitted to opposed member (113', 113 of transverse heat seal and intermediate cutting assembly (13) “)。

5. packing machine according to claim 1, wherein being located at the top member of transverse heat seal and intermediate cutting assembly (13) The pressurizer (63,63') of the upstream and downstream of part (113') is pressurizeed and extended downwardly by corresponding counteracting spring (64,64'), makes It is proper they it is static when, the lower edge with circular contour of above-mentioned pressurizer is grasped by the lower part of above-mentioned upper element (113') Make surface and is suitably separated from each other, and lower element (113 ") packet of the transverse heat seal and intermediate cutting assembly (13) The reversing device (163,163') opposite with the pressurizer (63,63') arranged on common horizontal plane is included, it is described to add Depressor and these reversing devices (163,163') are manufactured or are machined, to have and form package and formed from the pipe The film that mandrel (1) is left tubular wrapping (102') contact great friction coefficient, but also also with the counteracting spring (64, Effect 64') combines, and is responsible for when the upper element and lower element (113', 113 ") abut against each other with implementing it When two transverse heat seals and intermediate cutting and when these upper elements and lower element (113', 113 ") are close to each other still It is described when transverse heat seal and interposed cutting units (65,66,67) are promoted by corresponding reversing device (165,166,167) The packaging (102') of film can be securely clamped in these pressurizers (63,63') and corresponding reversing device (163,163) it Between, to discharge heat seal and cut portion with cooling packing.

6. packing machine according to claim 2, wherein the zigzag guide reel of the top branch of support conveyer (41) The auxiliary balladeur train (53) of (51,52) is along laterally equipped with horizontal and longitudinal guide (153), the horizontal and longitudinal guide Part slides on sliding part (54), and the sliding part is fixed on the top of cross member (55), and the cross member is then with it End is fixed to the side panel of main carriage (14), which rotatably supports a pair of of screw rod in cantilever fashion (56), the pair of screw rod is parallel to each other and is parallel to described horizontal and longitudinal guide, the pair of screw rod (56) and corresponding Driving screw (156) cooperation, the attachment (253) of the driving screw and auxiliary balladeur train (53) forms one, and the pair of screw rod (56) it is operated by moving parts (57,58), the moving parts are connect and with the cross member (55) flange by electronic horse Up to operation, the electric motor rotates in two directions and also has electronic phase angle control.

7. a kind of wrapped single or groups of product (P) using the packing machine according to any one of preceding claims 1 to 6 Method in the package from the film thermoplastic material obtained that spool is unwound, wherein transverse heat seal and intermediate cutting Component (13) is equipped with the pressurization in transverse heat seal and the upstream and downstream of cutter device (65,165,67,167,66,166) Device and reversed pressurizer (63,163,63', 163'), pipe can be clamped securely during the step of implementing transverse heat seal Shape film package, and wherein the transverse heat seal and intermediate cutting assembly (13) can form direction fortune along package It is dynamic, it is first shut off and moves away from pipe formation mandrel (1), then open and move in opposite direction, to return to circulation Starting position is to repeat subsequent operation circulation, so that passing through the transverse heat seal and intermediate cutting assembly (13) using pressurizer Pulling, tubular wrapping (102') can along pipe formed mandrel (1) advance, which is characterized in that in each subsequent tubular wrapping It can be implemented using the transverse heat seal and intermediate cutting assembly (13) in the formation of part (C1, C1', C1 ") and filling step, Transverse heat seal and intermediate cutting assembly (13) are closed and are moved away from mandrel (1) simultaneously, and it is further characterized in that, lateral heat The return movement to circulation starting position of sealing and intermediate cutting assembly (13) produces after it has already turned on for packing The return movement of the identical speed of push rod (6) of product is overlapped, and after the return step, populated and prepare closed rear end portion Package (C1 ") have been located at the downstream of transverse heat seal and intermediate cutting assembly (13).

8. the method according to the description of claim 7 is characterized in that when new tubular package (C1') advances and utilizes heat close The pressurizer (63,163,63', 163') for sealing the front end of the new package passes through transverse heat seal and intermediate cutting assembly (13) it pulls, when closing the rear end of the package (C1) of previous circulation, and being accompanied by the unloading of package of the previous circulation, Before the pressurizer (63,163) in the transverse heat seal and intermediate cutting assembly (13) downstream will be implemented on new package The transverse heat seal (ST1) of end when mechanically completely cutting off above-mentioned new packaging (C1') can rapidly be filled out by specified push rod (6) Fill so that the transverse heat seal (ST1) will not due to by product (P) be inserted into new tubular package (C1') and due to It is captured in the thrust for the air in above-mentioned new packaging (C1') and being located at before product (P) and is pressurized, equally in the step In, product (P) can be inserted into new package by push rod with relative velocity, which allows at the said goods (P) Upstream compressed and against the air of the front end of new package (C1') slowly and progressively discharge backward.

9. method according to claim 7 or 8, wherein during the active movement for forming mandrel (1) far from the pipe, Institute's having time needed for implementing its main heat-seal and cutting operation all provides transverse heat seal and intermediate cutting assembly (13), And in the decline of above-mentioned active movement, slightly opening heat sealer and cutter device are to discharge transverse heat seal (ST1, ST2), and be allowed for nature or force the movement of these cooling thermosealed devices, at the same by pressurizer (63, 163,63', 163') be always to maintain upstream and downstream package packaging, the pressurizer prevents the transverse heat seal Even the smallest stress on (ST1, ST2).

10. method according to claim 7 or 8, which is characterized in that laterally hot in the initial step of its operation circulation Sealing and intermediate cutting assembly (13) can be only partially closed on the tubular wrapping (102') of gusset, this partly Pipe can be slowly moved away from the state of closure and forms mandrel (1), towards package (C1') downstream movement and longitudinally The package is compressed, later, the transverse heat seal and intermediate cutting assembly (13) are closed completely and increase its movement velocity To implement the double transversal heat seal and intermediate cutting step that it is responsible for.