IT9003388A1 - AUTOMATIC MACHINE FOR PACKAGING CONTAINERS. - Google Patents

Description

container 100 corresponding to blank 36; a metering station D, located between the end part of the internal branch 50a and the initial part of the external branch 50b of the conveyor, in which a predetermined quantity of products 45 is inserted from top to bottom into each container; second folding means, operating along the aforementioned external branch, designed to define, after applying glue, the lid of the container.

The machine comprises means for the continuous adjustment of the format.

DESCRIPTION OF THE INVENTION

The present invention is part of the technical sector relating to machines for packaging vertically oriented containers, particularly suitable for inserting incoherent products, such as pasta, rice, etc., into such containers. o powdery and / or granular products, such as detergents, salt, sugar, feed, etc.

These machines substantially comprise - a closed loop wrapping conveyor on two wheels, respectively driving and driven, with a vertical axis.

In a known solution, this conveyor is identified as a chain to which blocks are externally blocked, equidistant, affected above and below by grooves coupled with corresponding fixed longitudinal guides.

To these blocks are externally locked, in a removable way, as many drawers, with a horizontal section in the shape of an MC ", intended to receive, and subsequently to hold elastically, tubular blanks in an open configuration, with the lower flaps (defining the bottom) and those upper (defining the lid) still vertical.

Each drawer receives its respective blank in correspondence with the initial part of the internal branch of the conveyor.

During the transfer of said blank along the aforementioned internal branch, a first series of folders, acting in phase relationship with members for the application of glue, folds the lower flaps of the blank so as to define the bottom of the container corresponding to such blank.

The dosing station is located between the terminal part of the internal branch and the initial part of the external branch of the conveyor, in which predetermined products are inserted into the container thus formed, from top to bottom.

During the transfer of the container, already filled with the relative products, along the external branch of the conveyor, a second series of folders, acting in phase relationship with members for the application of glue, folds the upper flaps of the same container with definition of the latter cover.

In order to pack containers of different sizes, it is necessary to change the format.

In the machine mentioned above it is necessary to unlock the drawers from the dowels, to replace them with other drawers of dimensions corresponding to the new format.

This entails a considerable amount of time, and the need to have as many series of drawers available as there are formats relating to the containers to be packaged with the machine, with all the storage and bulk problems of such series.

Furthermore, in the aforementioned machine, the size adjustment is discreet, which forces the user to request from the manufacturer a new series of drawers depending on a new type of container (for example imposed by the market) whose size is not included among the formats. available .

In a further known solution, the conveyor is identified as a steel belt to which pairs * of equally spaced blocks are constrained; the blocks of each pair identify / between them, a corresponding vertical seat for receiving, and subsequently for elastic retention, of a corresponding tubular blank in an open configuration.

When the format is changed, the assembly consisting of the belt and relative plugs is replaced. Compared to the previous case, the drawbacks connected with the format change are exalted.

The prerogative of the invention is to propose an automatic machine for the packaging of vertically oriented containers, such as to allow a continuous adjustment of the format, regulation carried out without any replacement of the organs responsible for receiving and subsequent elastic holding of the open blanks corresponding to the containers. to pack. Another prerogative of the invention is that of providing an automatic machine which, with the same operating path required for packaging, has a lower longitudinal development than known machines.

The aforementioned prerogatives are obtained in accordance with what is proposed in the claims.

The characteristics of the invention are highlighted below with particular reference to the attached drawing tables, in which:

- fig. 1 shows a schematic plan view of the machine;

- fig. 2 shows a schematic side view of the machine;

- Fig. 3 shows, according to a schematic perspective view, the initial part of the internal branch of the conveyor of the machine;

- fig. 4 schematically shows the view of the section IV-IV of fig. 1;

- fig. 5 illustrates the partially schematic view of section V-V of fig. 1;

- figs 6,7 illustrate, on an enlarged scale with respect to the previous figures, the details XI, X2 of fig.4; - figs 8,9 show, on an enlarged scale, the details Y1, Y2 of fig. 5.

With reference to said figures, 1 indicates the supporting structure of the machine.

Said structure supports, in a known manner, two vertical shafts 2,3, first and second respectively, located on the same side, arranged bilaterally with respect to a longitudinal plane 4 from which they are transversally equidistant and slightly offset longitudinally; the structure 1 rotatably supports a third vertical shaft 5 whose axis is located on the aforementioned plane 4 on the opposite side with respect to the previous shafts 2,3.

On the third shaft 5 a first spool 7 is keyed, starting from the top immediately below an upper wall 6 of the structure 1, to which a second spool 9 coaxial to the shaft 5 is removably locked underneath by means of members 8: spools 7, 9 are the same.

In detail, the members 8 are identified in a screw 10 whose stem passes freely in a slot 11 made in the second spool 9 (concentrically with respect to the axis 5) to engage with a threaded seat 12 provided in the first spool 7, and whose head 10a interferes with the lower face 9a of the spool 9.

The disengagement of said head 10a from the relative face 9a allows the second spool 9 to rotate with respect to the first spool 7 according to an angle not exceeding the angle in the center identified by the slot 11; the subsequent locking of the head 10a against the face 9a stabilizes the new mutual angular position of the reels 7, 9 which, in this situation, are integral with rotation.

It should be noted that the vertical position of the reels 7,9 remains in any case unchanged.

The structure 1 supports a longitudinal frame 13, with horizontal development, located below the aforementioned upper wall 6, through which the shafts 2,3,5 pass freely; members 14 move this frame vertically towards H1, H2.

A tubular turret 15 rotatably supporting, in a known manner, a third spool 17, equal to the previous spools 7, 9, constrained to rotation, by means of members 18, to the shaft 5, is constrained to the frame 13; these members 18 allow the axial translation of the spool 17 as a consequence of the axial movement of the frame 13.

A fourth reel 19 is flanked to the upper face of the reel 17, equal to the remaining reels, coaxial with respect to the shaft 5, which is prevented from sliding axial with respect to the adjacent reel 17. Members 16 mutually connect the second and fourth reels 9, 19.

These members make these latter spools mutually integral to rotation and, moreover, allow, if necessary (i.e. when the head 10a of the screw 10 is disengaged from the face 9a of the spool 9), to make the pair of spools 9,19 rotate in synchrony. compared to the remaining pair of spools 7.17.

In detail, the members 16 consist of two sleeves 20, 21, first and second respectively, with the relative head enlarged and peripherally affected by a toothing 20a, 21a <Figs 8,9>.

The first sleeve 20 is freely inserted in a corresponding seat made in the second spool 9, and with the relative toothing 20a it engages with a toothed sector 122 provided in a recess 22 made in the lower face of the first spool 7; members 122a lock the sector 122 to the spool 7.

The second sleeve 21 is freely inserted in a corresponding seat made in the fourth spool 19, and with the relative toothing 21a it engages with a toothed sector 123 provided in a recess 23 made in the upper face of the third spool 17; members 123a lock the sector 123 to the spool 17.

The first sleeve 20 is keyed onto a vertical shaft 24 which, with the aid of known means 25, is constrained to rotation relative to the second sleeve 21 with the possibility for the latter to slide axially with respect to the shaft itself; this sliding is not prevented by the third spool 17 'since a through hole 26 centered with respect to the shaft 24 is made in the latter.

Flattening 27 are provided in said shaft with which conventional means can be engaged for imparting to shaft 24, after intervening on said members 8, a predetermined rotation in either direction W1, W2; this causes an equal rotation of the (internal) reels 9,19.

Ultimately, the angular position of the pair of reels 9,19 (integral with rotation) with respect to the remaining pair of reels 7,17 (also integral with rotation) is adjusted by means of the members 16, while the vertical distance is adjusted with the members 14 of the reels 17,19 (integral with the vertical translation) with respect to the remaining reels 7,9 which, as already mentioned, are prevented from translating vertically. A ring 200 is locked to the second spool 9, positioned between the latter and the first spool 7; similarly to the fourth spool 19 a ring 210 is locked, positioned between the latter and the third spool 17. Said rings, equal to each other, have a diameter slightly greater than the diameter of the spools! their function will be explained below.

The first and second shafts 2,3 rotatably support relative reels 7a, 9a, 7b, 9b corresponding to the aforementioned first and second reels 7, 9, located correspondingly at the same height as the latter.

The aforementioned frame 13 rotatably supports two pairs of spools 17a, 19a and 17b, 19b coaxial respectively with said shafts 2,3, and vertically movable identically to the aforementioned third and fourth spools 17,19; to each of the latter correspond, for each shaft 2.3 as many spools located at the same height. With the aforementioned sprockets 7,9,17,19, and corresponding sprockets associated with shafts 2,3, as many equal chains 70,90,170,190 are engaged, respectively first, second, third and fourth, developing identically, in a closed loop, on horizontal planes and jointly defining a conveyor 50; these chains are motorized, in the same direction S, by means of the third shaft 5.

In fact, the latter rotates the reels 7,17 and, by means of the members 16, these latter reels rotate the remaining reels 9,19.

Relative prongs 28.29.30.31 oriented radially outwards and equidistant are connected to the chains 70,90,170,190; the number of prongs is the same for each chain.

The prongs 28,30 of the chains 70,170 (the outermost ones) are arranged on the same vertical plane; the prongs 29.31 of the chains 90,190 (the innermost ones) are arranged on the same vertical plane and in an advanced position with respect to a corresponding pair of prongs 28,30 of the remaining chains 70,170.

Ultimately, a pair of prongs 29,31 (or feedback tines) and the corresponding pair of prongs 28,30 (or thrust tines), jointly identify a vertical seat 32.

From what has already been said, it follows that the two chains 70,90 are prevented from translating vertically, while the chains 170,190 are integral with the vertical translation.

The two chains 70, 90 in the rectilinear portions corresponding to the internal 50a and external 50b branches of the conveyor 50, are inserted in corresponding longitudinal grooves 33a, 33b made in a corresponding block 33 locked, by known means, to the structure 1; the remaining chains 170,190 are inserted in relative blocks 133 (one for each branch of the conveyor).

Each block 33,133 has a double function, respectively of guide and support, limited to the aforementioned longitudinal section, for the corresponding pair of chains; the vertical longitudinal face 34, 133a of this block 33, 133 is coplanar with the vertical longitudinal face 133a, 34 of the remaining block 133, 34 (located on the same internal 50a or external 50b branch of the conveyor 50) to define a fixed vertical reference plane 35, 35a (fig. 1), which will be discussed below, respectively for the internal 50a and external 50b branches.

Each seat 32 is intended to receive, in correspondence with the Initial part of the internal branch 50a (feeding station A), a tubular blank 36 in a partially open configuration, and with the lower flaps 36a and the upper ones 36b still in vertical position.

The seat 32, in transit through station A, is such as to facilitate the insertion of the blank 36 therein; in fact the thrust tines 28,30 are traveling along the last stretch of curvilinear trajectory imposed by the shaft 3, therefore, together with the abutment tines 29,31, they define a sort of invitation which, in fact, facilitates this insertion.

Downstream of station A, the blank is held elastically by the aforementioned prongs 29,31,28,30, it is longitudinally guided in an internal position by the aforementioned reference plane 35 and in an external position by longitudinal guide stops 37, upper, and 38, lower . The upper abutment 37 is positioned at an intermediate height with respect to the prongs 28, 29, and is constrained to the structure 1 with the interposition of organs 137 (fig. 7) which allow its translation in the transverse directions Bl, B2, perpendicular to the aforementioned towards S. The lower abutment 38 is positioned at an intermediate height with respect to the prongs 30,31, and is constrained to the aforementioned frame 13 with the interposition of members 138 (fig.4) which allow its translation in the aforementioned lines B1, B2.

Along the inner branch 50a of the conveyor 50 operate first folding means, consisting of fixed (not shown) and movable folders; of the latter, one has been indicated (reference 39) among the three possible associable with this internal branch.

The shaft 139, on which the bender 39 is keyed, is driven in rotation, towards K, by means of transmission members 40 which are in turn driven by a line 140; this last line also powers transmission members 40a, 40b designed to rotate shafts 139a, 139b on which, if necessary, corresponding rotating benders are keyed.

The use of one, or two, or three rotating folders depends on the type of lower flaps 36a to be folded.

The aforementioned first folding members intervene to bend the aforementioned flaps 36a, for example first the transverse ones and then the longitudinal ones, which, after applying glue on some of these flaps (carried out in phase relationship with said folds and by means of known members, do not illustrated) allows to define the bottom of the container 100 corresponding to the blank 36.

The intervention of the first folders on the flaps 36a causes stresses on the blank, of which the vertical ones, obviously directed upwards, are contrasted by two fixed longitudinal abutments 41, 42 affected below by longitudinal grooves 41a, 42a, facing downwards, within which slide the upper edges of the upper longitudinal flaps 36b of the blank (fig. 7).

The aforementioned strikers are linked to structure 1 with the interposition of relative organs 141,142 C fig. 7) which allow their vertical translation (verses H1, H2); the organs 142 also allow transversal translations (verses B1, B2>.

A metering station D is provided in correspondence with the curved portion 50c of the conveyor 50 located on the side of the third shaft 5.

In this station a platform 43 is provided, on which the partially formed containers 100 are temporarily transferred (always inserted in the relative seats 32), unwinding along the aforementioned curved section and made oscillating according to known techniques, not illustrated.

Along this curved section 50c the containers 100, partially formed, are internally guided by the circumferential surfaces of the aforementioned rings 200, 210 (fig. 5), and externally guided by steel strips 300, 310 (fig. 5), which unfold according to arches of circumference (fig. 1); the development of these strips is continuously adjustable (in a known way, not shown) so as to satisfy the requirements of the various container formats, as shown below.

The rings 200, 210 and the strips 300, 310 identify a guide channel C for the partially formed containers 100 passing through the station D (Fig. 5).

The station D comprises a carousel 144, rotatably supported by the structure 1, driven into rotation by the shaft 5 and provided with metering devices 44, equidistant angularly and equidistant with respect to the axis of the shaft 5.

Each dispenser is provided with a mouth 44a, facing downwards, such as to be positioned in correspondence with the upper open end of a corresponding container 100 passing through station D.

Each dispenser, movable in synchrony with the relative container for an arc of approximately 180 degrees, inserts in the latter a predetermined quantity of products 45 (eg rice, sugar, salt, pasta, detergent, feed, etc.).

Downstream of station D, i.e. along the external branch 50b of the conveyor, the container 100, already filled with products, is supported at the bottom by a longitudinal tablet 46, internally guided by the aforementioned reference plane 35a and externally guided by upper longitudinal abutments 47 ( constrained to the structure 1) and lower 48 (constrained to the frame 13); see fig. 4. These abutments 47,48 are positioned at the same height as the cited abutments 37,38 and are translatable transversely, by means of corresponding members, identically as the latter.

The definition of the lid of the container 100 is achieved by means of second folding members, associated with the aforementioned external branch 50b; of these folders only the mobile ones 49 are shown (figs. 2 and 4) keyed on shafts 149a, 149b driven into rotation by the aforementioned transmission line 140.

The second folding members intervene to fold the upper flaps 36b in a suitable phase relationship with the application on the latter of glue, all according to known techniques, not illustrated.

At the end of the external branch 50b the packaged containers 100 are transferred, by means of a pair of straps 400,410, to a receiving line R.

The aforementioned transmission line 140 is motorized by a transmission line 240 associated with a reducer 51 (which rotates the shaft 5) which in turn is driven by a gear reducer 52

The mouths 44a of the dispensers 44, vertically fixed in the glove, define a fixed reference wire Fs (fig. 2) with respect to which, in station D, the upper edges of the head, still open, of the container 100 must be positioned in a suitable manner. .

Respect for this fixed thread Fs must be maintained when the height of the container 100 varies, which entails a variation in the format.

The variation of the format does not only imply the resolution of the aforementioned problem, as also the variation of the longitudinal and / or transversal dimension requires corresponding adjustments and / or suitable interventions on the machine in question.

The variation of the longitudinal dimension of the container 100 entails the adjustment of the mutual longitudinal distance between the abutment tines 29,31 and the thrust tines 28,30; this is carried out continuously, without any replacement of organs, by intervening only on the aforementioned organs 8 and 16.

The variation of the transversal dimension of the container 100 involves corresponding transversal translations of the longitudinal abutments 37,38, 47,48 and of the abutment 42 of the upper flaps 36b; furthermore, the abutments 41,42 are translated vertically so as to adapt to the new dimensions of the flaps 36b. Finally, it is necessary to adjust the development of the strips 300,310 so that the latter perform guiding functions for the external edges of the container in the portion 50c of the conveyor 50.

The variation of the height of the container 100 entails the adjustment of the vertical height of the frame 13, carried out by means of the aforementioned members 14, which causes the equal translation of the prongs 30,31, of the lower strikers 38,48 and of the first folding members.

The variations of the format which involve variations of the height and / or of the width (longitudinal dimension) and / or of the depth (transversal dimension), correspondingly entail the adjustments already mentioned.

It should be pointed out that the proposed machine allows a continuous adjustment of the format in considerably shorter times than what is currently implemented in the known solutions mentioned in the introduction, and, advantageously, without any replacement of members and / or parts of the machine.

The continuous adjustment of the format makes the machine universal, that is, it can be used for any type of container on the market, and for any containers that will eventually be proposed in the future.

The present machine is shaped in such a way as to satisfy two different market segments; i.e. it is possible, starting from the same conformation and structure, to create a machine with low productivity (e.g. 100 packaged containers per minute) or a machine with medium productivity (e.g. 200 packaged containers per minute), intervening only to replace the four chains (which does not entail difficulties, as they are of a commercial type) and to vary the number of dispensers 44 (eg: from four to eight dispensers).

The advantageous aspect referred to above, that is the continuous adjustment of the format, makes the present machine modular with operating groups, with differentiated functions, located downstream of the same; moreover, the same machine can be advantageously associated with a device which picks up the blanks in a flattened tubular configuration from a magazine and intermittently inserts them, partially open, into the seat 32 where the combined action of the prongs defining said seat completes the opening of the blank.

This device was the subject of a corresponding application filed today in the name of the same Applicant.

The operating path of the present machine is constituted by the sum of the length of the internal branch 50a, of the curved section 50c where the metering station D is located and of the external branch 50b.

The particular location of the trees 2,3, in combination with the values of the diameters of the winding spools 7a, b, 9a, b, 17a, b, 19a, b of the chains 70,90,170,190, if on the one hand they maintain the branches 50a, 50b parallel to each other, on the other hand allow a reduction in the longitudinal bulk of the machine with the same operating path.

The machine is shaped in such a way as to allow folding of the flaps 36a, 36b of any type of blank 36; as mentioned, shafts 139, 139a, 139b are provided on which it is possible to fit movable folders, relative to the first folders, and shafts 149a, 149b on which it is possible to key mobile folders, relative to the second folders.

The machine is designed to allow automatic adjustment of the format change.

In fact the members 8 can be replaced with equivalent electrically controlled members; the members 16 can be electrically controlled, enslaving the members 8; the members 14 are already provided with electric control, so that, ultimately, it is possible to delegate the command and control of these members 8,14,16 to an electronic control unit.

Also the transversal adjustments (verses B1, B2) of the longitudinal stops 37,38, 47,48, as well as the vertical adjustments of the stops 41,42, and transversal adjustments of the abutment 42 can be made by providing suitable electric actuators commanded and controlled by said control unit.

Ultimately, this machine lends itself to the centralization of commands relating to format change, with all the advantages that this entails.

It is understood that what above has been described by way of example, therefore any constructive variants are intended to fall within the protective scope of the invention as described above and claimed hereinafter.

Claims (5)

CLAIMS 1) Automatic machine for packaging vertically oriented containers, of the type comprising: a closed loop conveyor 50 defining an internal branch 50a, and an external branch 50b, parallel to each other, forming seats 32 intended to receive, and subsequently to elastically retaining tubular blanks 36 in an at least partially open configuration; a device for feeding said blanks in a tubular configuration at least partially open to relative seats 32 passing through a feeding station A located at the beginning of said internal branch 50a; first folding members, associated with said internal branch, cooperating, in phase relation, with means for applying glue on the lower flaps 36a of each blank, to define the bottom of the container 100 corresponding to the latter; a metering station D, located between the final part of the internal branch 50a and the initial part of the external branch 50b, provided with metering members 44 designed to insert into each container 100, from top to bottom, a predetermined quantity of products 45 ; second folding members, associated with said external branch, cooperating, in phase relation, with means for applying glue on the upper flaps 36b of said container 100 already filled with products 45 to define the lid of the container itself; the aforementioned machine characterized by the fact that the aforementioned conveyor consists of at least two chains 70,90,170,190, respectively first and second, winding in a closed loop on horizontal planes, positioned so that the first is superimposed on the second, motorized in the same direction S with equal speed and provided with an equal number of radial tines 28,29,30,31 oriented towards the outside, respectively thrust 28,30 for the first chain 70,170 and abutment 29,31 for the second chain 90,190, with said thrust and abutment prongs defining as many pairs of prongs identifying the aforementioned vertical seats 32 for receiving, and subsequent elastic retention, of said tubular blanks at least partially open; said machine is further characterized in that it provides first means for continuously adjusting the mutual sliding of said chains; second means for continuously adjusting the mutual vertical distance between said chains; third means for defining, in correspondence with the aforementioned internal and external branches, longitudinal reference and guide planes for the internal longitudinal facade, first of the blank and subsequently of the container relative to the latter, during the packaging phase; fourth means located in correspondence with the aforementioned internal and external branches, designed for the longitudinal guide of the external longitudinal facade first of the blank and subsequently of the container, relating thereto, during the packaging phase; fifth means, associated with the aforementioned internal branch, designed to engage the upper edges of the upper longitudinal flaps first of the blank and subsequently of the container, relating to the latter, during the packaging phase, in contrast to the vertical stresses, directed upwards , consequent to the intervention of the aforementioned first folders on the lower flaps of the blank. 2) Machine according to claim 1, in which said chains 70,90,170,190 are wound on corresponding coaxial motor sprockets 7,9,17,19, and coaxial driven sprockets 7a, b, 9a, b, 17a, b, 19a, b , characterized by the fact that said first means comprise members for the mutual locking and unlocking upon rotation of the motor sprockets 7,9,17,19 of said chains, and members, enslaved to the previous ones, for the continuous adjustment of the mutual angular phase shift of the aforementioned sprockets engines. 3) Machine according to claim 1, in which said chains 70,90,170,190 are wound on corresponding coaxial motor sprockets 7,9,17,19, and coaxial driven sprockets 7a, b, 9a, b, 17a, b, 19a, b , characterized by the fact that the aforementioned second means consist of a horizontal frame 13, made vertically movable with continuity, supporting the motor sprockets 17, 19 and the ducts 17a, b, 19a, b relating to the first chain 70,90 or to the second chain 170,190, with the latter motor spools and ducts coupled integrally to the rotation relative to the corresponding remaining spools. 4) Machine according to claim 3, characterized in that the aforementioned frame 13 rotatably supports the drive sprockets 17,19 and the driven sprockets 17a, b, 19a, b of the second chain 170,190, while the remaining drive sprockets 7,9 and driven 7a , b, 9a, b of the first chain 70,90 are supported by the structure of the machine. 5) Machine according to claim 1, characterized in that each chain winds on a motor spool 7,9,17,19 located in correspondence with the metering station D, and, on the opposite side, on at least two driven spools 7a, b, 9a, b, 17a, b, 19a, b whose diameters, and the positioning of which are such as to keep the aforementioned internal and external branches 50a, 50b mutually parallel. G) Machine according to claim 1, characterized by the fact that the aforementioned third means consist of longitudinal blocks 33,133 located in correspondence with the aforementioned internal 50a and external 50b branches of the conveyor, affected by relative longitudinal grooves 33a, 33b for sliding and guides for said chains 70,90,170,190, the longitudinal front face 34,133a of each block 33, 133 resulting vertical and coplanar with the same face 133a, 34 of the remaining block 133a, 34 to define corresponding longitudinal reference planes 35,35a and guide of the longitudinal face first of the blank and then of the container relative to the latter, during the packaging phase. 7) Machine according to claim 1, characterized in that the aforementioned fourth means provide, both for the internal branch 50a and for the external branch 50b, at least one longitudinal abutment 37, 38, 47, 48 for guiding the aforementioned external facade first of the blank 36 and subsequently of the container 100, relative to the latter, during the packaging phase, with said abutments translatable transversely, with respect to the direction S of advancement of the conveyor 50, as a function of the transverse dimensions of said blank or container. 8) Machine according to claim 1, characterized by the fact that said fifth means consist of two longitudinal abutments 41, 42 affected below by longitudinal grooves 41a, 42a intended to receive the upper edges of the upper longitudinal flaps first of the blank, and subsequently of the container, relative to the latter, during the packaging stage, said abutments 41,42 being vertically movable according to the dimensions of said blank 36 or container 100. 9) Machine according to claim 8, characterized in that the external longitudinal abutment 42 between said two longitudinal abutments 41, 42 is made transversely movable according to the transversal dimensions of the blank or container. 10) Machine according to claim 1, in which said chains 70,90,170,190 are wound on corresponding motor sprockets 7,9,17,19 and driven sprockets 7a, b, 9a, b, 17a, b 19a, b, characterized by the fact that to the reels 9,19 located in correspondence with the dosing station D, as many rings 200,210, with a diameter greater than the reels themselves, are blocked, defining with their circumferential surfaces an abutment and internal guide for the containers, partially formed, passing along the curved section 50c, associated with said station D, of said conveyor, and by the fact that in said curved portion 50c there is at least one curvilinear strip 300,310, which runs along a radius of curvature greater than the radius of said rings 200,210 and defining, in combination with the latter , a guide channel C for the containers in transit in the dosing station D.