ES1284139U - CARDBOARD BOX CONVEYOR WITH FLANGES LOCATED ON THE TOP OF THE SIDE WALLS OF THE SAME AND FOLDED TOWARDS THE OUTSIDE OF THEM (Machine-translation by Google Translate, not legally binding) - Google Patents

Abstract

Conveyor (20) of cardboard boxes (B) with flanges (R) located in the upper part of the side walls (PL) of the same and bent towards the outside of these, the conveyor (20) comprising two conveyor guides (30) elongated and aligned with each other following a transport path (T1), and facing and separated from each other a separation distance (DS) perpendicular to the transport path (T1), characterized because The two conveyor guides (30) are configured so that the lower parts of respective opposite flanges (R) arising from respective mutually opposite side walls (PL) of the box (B) come into contact, each with a corresponding upper part of the conveyor guides (30), along the transport path (T1) and from a receiving end (30a) towards a delivery end (30b) of said conveyor guides (30), to guide the boxes (B) during transportation. (Machine-translation by Google Translate, not legally binding)

Description

DESCRIPTION

CARDBOARD BOX CONVEYOR WITH RIDGES LOCATED ON THE

UPPER PART OF THE SIDE WALLS OF THE SAME AND FOLDED

TO THE OUTSIDE OF THESE

TECHNICAL SECTOR

The present invention is related to a conveyor for cardboard boxes with flanges located on the upper part of the side walls of the same and folded towards the outside of these.

BACKGROUND OF THE INVENTION

Figs. 8 and 12 of US4861325A and Figs. 6 and 14 to 16 of document US4832675A, and corresponding descriptions of the same, disclose some serrated vertical conveyor guides fixed to a base plate to evacuate the boxes formed by the outlet mouth of the mold of a box-forming machine with rims located on the upper part of the side walls of the same and folded towards the outside of these. These serrated guides include horizontal ridged teeth. The head or male, as it introduces successive boxes into the mold cavity, pushes this last box inserted against the boxes previously nested and retained by the lower part of the rims in the teeth of the sawn guides, causing each of the boxes nested in the stack of boxes move from upper teeth to lower teeth, to be retained again in these lower teeth.

Document ES2851825A1, by the same inventor as the present application, discloses a machine for forming boxes with rims R located in the upper part of their side walls PL and folded towards their outside. The machine 100 comprises a core with the shape of an inverted truncated pyramid, complementary to the side walls of the box to be formed, linearly movable inside the cavity 52 of a mold 50, which includes shaping elements. The formed boxes B are evacuated from the mold through an outlet mouth 55 opposite to an inlet mouth 54 of the plate.

In the aforementioned document ES2851825A1, the rims R of the boxes B formed are preferably flat and horizontal, forming a flat frame with a continuous and peripheral rim at the top of the side walls PL and parallel to the bottom plane of the box. box B, to facilitate a subsequent top sealing operation using a film usually made of a plastic compound.

These boxes are usually made by folding and gluing from a sheet material, which includes the cases of corrugated cardboard sheet (more resistant), compact cardboard sheet (less resistant), a combination of these, and the like, which have weakened fold lines are made to facilitate its formation in a box by folding parts of the plate around said weakened lines, but at the same time the sheet has a certain rigidity.

Document US2925758A, cited in the aforementioned document ES2851825A1, shows a machine for forming containers from metal sheets or similar combinations, in which the material, once folded, maintains its folded position. Document US2925758A explains that such a machine is not suitable for the production of cardboard boxes and trays, since metallic materials have memory before bending, and, therefore, a cardboard material needs to be kept in the folded position for a while until the adhesive bonds parts of the box to one another.

In one of the embodiments of document ES2851825A1, in the outlet mouth 55 of the cavity 52 of the mold 50 there are movable vertical guides 90 between a retracted position and a box support position, where the boxes are supported forming a stack of boxes, nested one inside the other, exerting lateral pressure against the lateral edges of two mutually opposite rims R bent outwards.

The present invention poses the technical problem of transporting cardboard boxes with flanges located in the upper part of their side walls and folded towards the outside of these, in a simple and efficient way, without avoiding continuous production stops, or necks of bottle throughout the process, and without producing deformations that can damage out-bent rims on such boxes or other box parts.

In addition, it would be desirable for the conveyor to be adaptable to the changing dimensions and shapes of the box formed, which is highly appreciated in the sector to reduce production downtime and high associated tooling costs.

EXPLANATION OF THE INVENTION

To solve the drawbacks set out in the previous section, the present invention presents a conveyor for cardboard boxes, already formed, and preferably empty, although the case that they are full of product to contain, with rims, is not excluded. located in the upper part of the side walls that surround the bottom of the box, and folded towards the outside of these boxes.

These rims form a preferably flat peripheral rim frame at the top of the side walls. The frame is preferably parallel to the bottom plane of the box to facilitate an optional upper sealing operation of an upper open mouth of the same, usually by means of a film. The present invention covers the cases of boxes with flanges that form a frame with a curved or polygonal cross-section, among other options. The present invention also covers the cases of boxes where the ends of the rims are bent outwards and stuck against the outside of the side walls from which they arise.

The number of sidewalls surrounding the bottom of the box is even, and equal to or greater than four, so that the box has two mutually facing sidewalls with rims turned towards the outside of the box. For example, the box may have four or eight sidewalls.

Optionally, the boxes can be provided with one or more chamfers located in each of the corner areas defined by two adjoining side walls. For example, the box may have four sides, and two chamfers at each of the corner regions, thus the box having twelve flat side faces.

The boxes to be transported in the present invention are usually made by folding and joining (for example by means of an adhesive or glue) from a laminar material, which includes the cases of corrugated cardboard sheet (more resistant), compact cardboard sheet (less strong), a combination of these, and the like, preferably having weakened fold lines made to facilitate boxing by bending portions of the sheet around said weakened lines, but at the same time having the sheet true rigidity.

In a way known in the state of the art, the conveyor comprises the characteristics described below.

The conveyor comprises two elongated conveyor guides aligned with each other following a conveyor path. The conveyor guides face and are spaced apart from each other a separation distance perpendicular to the transport path.

That is, the conveyor guides face each other and are spaced apart along the transport path, as well as portions of said transport path.

Said transport path generally designates any path in space following a forward direction, and although the transport path is preferably linear or includes linear portions, the present invention also expressly covers the option of a path including a flat curve, or the option for the path to include a helical curve or portions of it, among many other options.

Unlike the state of the art, the present invention proposes, in a way known in the state of the art, the characteristics described below.

On the conveyor, the two conveyor guides are configured so that the bottoms of respective opposing rims arising from respective mutually opposite sidewalls of the box come into contact, each bottom with a corresponding top of the conveyor guides, along of the transport path and from a receiving end to a delivery end of said conveyor guides, to guide the boxes during their transport.

The lower portions of the rims that contact along the upper portions of the conveyor guides include the lower sides of said rims and/or include respective transition zones between said respective rims and respective mutually opposite side walls of the box. Each transition zone may optionally include a connecting fold line between a respective sidewall and a respective rim.

The upper parts of the conveyor guides can be materialized in respective flat surfaces, for example, corresponding to the surface determined by the thickness of some plates, or in the upper surface of the transport of a conveyor belt.

Alternatively, the upper parts of the conveyor guides can be embodied in respective rounded surfaces, for example corresponding with rounded bars.

Alternatively, the upper parts of the conveyor guides can be materialized in linear guide edges or rims, for example, corresponding to the edges or edges located in the end portions of an elongated profile with a U-shaped or "omega"-shaped cross-section. ” inverted, among other options.

Thus, the present invention expressly covers the possibility that the two conveyor guides can be integrated into a single piece, for example, a piece essentially in the shape of a "U" or an inverted "omega", where the conveyor guide and its upper part corresponds to a respective end portion that forms part of this same single piece.

In use, the separation distance between conveyor guides, perpendicular to the transport path, is equal to or greater than the distance between respective transition zones between said respective flanges and respective mutually opposite side walls of the box, and less than the distance between the two opposite lateral end edges of the flanges that come into contact on the conveyor guides.

Advantageously, the present invention allows the transport of both corrugated cardboard boxes (more resistant) and compact cardboard boxes (cardboard, which is less resistant).

Advantageously, jams during transport and consequent production stops are mitigated, especially in this case of transporting cardboard boxes, where cardboard boxes may be subject to overturning due to their light weight, and/or to deformations in the boxes being transported.

Thanks to the simple and intuitive configuration and structure of the conveyor, it is easily handled by all types of operators, even by non-specialized operators, even for its optional adaptation (whose elements will be described later) to transport boxes with outwardly folded flanges of different sizes. sizes and/or shapes, or to transport boxes avoiding their deformation and/or breakage and/or tears.

From this point on, optional features of the conveyor of the present invention are described.

Preferably, the conveyor is configured to essentially receive the bottom and side walls of the box below the tops of said conveyor guides.

Advantageously, this separation distance perpendicular to the transport path ensures correct contact between the rims and the upper parts of the conveyor guides in order to carry out correct guidance.

Preferably, the two conveyor guides are configured so that the lower parts of respective opposite rims arising from respective mutually opposite side walls of the box slide, each lower part with the corresponding upper part of the conveyor guides, along the path of movement. transport, from the receiving end to the delivery end of said conveyor guides, to slide the boxes during their transport.

Thus, the upper parts of the conveyor guides are configured for a double functionality: to contact and slide two lower parts of respective opposite rims of the boxes, to transport these boxes.

Preferably, the upper parts of the conveyor guides are smooth to facilitate sliding transport.

Preferably, the two conveyor guides are configured so that the bottoms of respective opposite rims arising from respective mutually opposite side walls of the box are supported, each bottom with the corresponding top of the conveyor guides, along the path transport, from the receiving end to the delivery end of said conveyor guides, to support the boxes during their transport.

Advantageously, the boxes are now supported, that is, supported, on the conveyor guides, further minimizing unwanted overturning of these relatively light-weight cardboard boxes and improving their guidance by sliding along the conveyor guides, and additionally reducing the unwanted small jumps of the box on the upper part of the conveyor guides that can occur during their transport that can lead to overturning, to deformation of the boxes due to collisions with other bodies or other boxes being transported during their transport .

Thus, the upper parts of the conveyor guides are configured for a double functionality: to contact and support two lower parts of respective opposite rims of the boxes, to transport these boxes.

The present invention contemplates other optional aspects, such as a support means for the conveyor guides, and the optional possibility of fixing the conveyor guides by means of this support means in a strategic position.

The present invention also discloses other options, such as, for example, an embodiment with a movable transport element of the conveyor, or an alternative embodiment where in the conveyor the aforementioned conveyor guides are rough and have the ability to move by means of a drive member.

The present invention also discloses optional regulators, including position regulators according to one or more intended linear directions, as well as optional tilt regulators of the conveyor guides with respect to the horizontal.

Any one of the optional position regulators has a dual functionality, it can serve both to positionally adjust the conveyor guides to the dimensions of a box with a certain size and shape so that it does not suffer deformation during transport, or it can be used to positionally adjust the conveyor guides to the changing sizes and/or changing shapes of the box, for example, boxes with different number of sides , with or without optional chamfers, etc.

Other objects, advantages and features of the invention will be apparent to those skilled in the art in part from the description and in part from the practice of the invention. Furthermore, the present invention covers all possible combinations of particular and preferred embodiments indicated herein.

BRIEF DESCRIPTION OF THE DRAWINGS

To complement the description that is being made of the object of the invention and to help a better understanding of the characteristics that distinguish it, this description is accompanied, as an integral part of it, by a set of plans, in which that for illustrative and non-limiting purposes the following has been represented:

Fig. 1 is a top perspective view of a first embodiment of the conveyor of the present invention and where two boxes have been shown, each with four side walls and two optional chamfers in each of the four corners of the box, the the first box is located in an initial position, while the second box is being supported and guided by the conveyor;

Fig.2 is a side view of Fig. 1;

Fig. 3 is a top perspective view of the conveyor of Fig. 1, which further comprises an auxiliary conveyor, and where the conveyor guides are fixed by the support means in a position located below the outlet of a mouth outlet from a forming cavity of a box forming machine;

Fig. 4 is a bottom perspective view of Fig. 3;

Fig. 5 is a cutaway side view of Figs. 3 and 4, where some parts of the chassis of the box forming machine have been omitted for clarity;

Fig. 6 is a cutaway side perspective view of a second embodiment of the conveyor of the present invention;

Fig. 7 is a side perspective view of a third embodiment of the conveyor of the present invention;

Fig. 8 is an enlarged view of detail IV indicated in a dashed-dotted box in Fig. 7; Y

Fig. 9 is a cutaway side view of a fourth embodiment of the conveyor of the present invention, and where some elements have been partially represented for a better understanding;

DETAILED EXPOSITION OF EMBODIMENTS / EXAMPLES

In the present invention, the figures show different preferred embodiments of the conveyor (20) of cardboard boxes (B) with rims (R) located in the upper part of the side walls (PL) of the same and folded towards the outside of these .

Figs. 1 and 2 show that the number of side walls (PL) surrounding the bottom (F) of the box (B) is equal to four, and these four side walls (PL) are mutually facing each other in pairs with folded rims (R). to the outside of the box (B).

Figs. 1 and 2 show that, optionally, these boxes (B) are provided with two chamfers located in each of the corner zones defined by two contiguous side walls (PL), thus the box has twelve flat side faces.

In Figs. 1 and 2, the boxes (B) to be transported are usually made by folding and joining (for example by means of an adhesive or glue) from a laminar material, which includes the cases of corrugated cardboard sheet (more resistant), sheet (less strong) solid board, a combination of these, and the like, preferably having weakened fold lines made to facilitate boxing by folding portions of the board about said weakened lines, but at the same time having the sheet or plate some rigidity.

In Figs. 1 to 9, these rims (R) arise from the four side walls (PL), one for each side wall (PL), and form an essentially rectangular flat frame with a continuous peripheral rim at the top of the side walls (PL) . The flat frame is parallel to the bottom plane (F) of the box (B) to facilitate an optional top sealing operation, usually by means of a film.

Common to all embodiments, in Figs. 1 to 9 the conveyor (20) comprises two conveyor guides (30) elongated and aligned with each other following a transport path (T1), and facing and separated from each other a separation distance (DS) perpendicular to the transport path (T1 ).

Common to all embodiments, in Figs. 1 to 9 of the conveyor (20), the two conveyor guides (30) are configured so that the bottoms of respective opposite rims (R) arising from respective mutually opposite side walls (PL) of the box (B) come into contact , each lower part with a corresponding upper part of the conveyor guides (30), along the transport path (T1) and from a receiving end (30a) towards a delivery end (30b) of said conveyor guides ( 30), to guide the boxes (B) during their transport.

In the particular embodiments of Figs. 1 to 8, in the conveyor (20), the two conveyor guides (30) are further configured so that the bottoms of respective opposite rims (R) arising from respective mutually opposite side walls (PL) of the box (B) slide and are supported, each lower part with the corresponding upper part of the conveyor guides (30), along the transport path (T1), from the receiving end (30a) to the delivery end (30b) of said conveyor guides (30), to slide and support the boxes (B) during their transport.

Common to all embodiments, in Figs. 1 to 9, the conveyor (20) is configured to essentially house the bottom (F) and side walls (PL) of the box (B) below the tops of said conveyor guides (30).

Figs. 1 and 2 show in detail that the separation distance (DS) between conveyor guides (30), perpendicular to the transport path (T1), is equal to or greater than the distance between respective transition zones between said respective rims (R) and respective mutually opposite lateral walls (PL) of the box (B), and less than the distance between the two opposite lateral end edges (EL) of the rims (R) that come into contact on the conveyor guides (30).

In Figs. 1 to 8, the upper parts of the conveyor guides (30) are configured for a triple functionality: contact, slide and support two lower parts of two opposite rims (R) of the boxes (B), to transport these boxes (B) .

In Figs. 1 to 9, the lower parts of the rims (R) that contact, and/or slide, and/or are supported, along the upper parts of the conveyor guides (30) include the lower sides of said rims (R) and/or include respective transition zones between said respective rims (R) and respective mutually opposite side walls (PL) of the box (B).

Each transition zone may optionally include a connecting fold line (LR) between a respective sidewall (PL) and a respective rim (R), as detailed in Figs. 1 and 2.

The upper parts of the conveyor guides (30) can be materialized in respective flat surfaces, for example, corresponding with respective surfaces determined by the thickness of some plates (Figs. 1 and 2), or in respective upper surfaces of conveyor belts. or conveyor belts (Fig. 9).

In Figs. 1 to 7, the upper parts of the conveyor guides (30) are smooth, simplifying the transport of the boxes (B) by contact, sliding and support along the conveyor guides (30), and this transport can optionally be assisted by the gravity.

In the particular embodiments of Figs. 1 to 6, the conveyor guides (30) are linear and have a downward inclination with respect to the horizontal, thus being the transport path (T1) linear, simplifying the transport of the boxes (B) by contact, sliding and support along along the conveyor guides (30), and this transport may optionally be assisted by gravity.

Preferably, in Figs. 1 to 9 the conveyor (20) comprises a support means that supports the two conveyor guides (30). Figs. 1 and 2 show this support medium in detail.

Figs. 1 to 6 show that this support means can comprise two supports (21, 23; 21, 23) where each support (21, 23) supports a respective conveyor guide (30). Alternatively, Fig. 9 shows that the support means comprises a single support (21) integrated in an auxiliary chassis (121).

In Figs. 1 and 2, preferably, each of the supports (21, 23) are materialized in a flange support provided with a cover (21) and back cover (23) that can be positioned by means of a locking and unlocking element (21b) in a desired position.

Throughout the description, the locking and unlocking elements are screws or equivalents, and it also includes the case where each locking and unlocking element corresponds to some edges of a spindle (not shown), and a combination of these options.

In a second embodiment of the conveyor (20), the conveyor guides (30) are fixed by the support means in a position located below the exit of a outlet mouth of a forming cavity (52) of a box forming machine (100).

In an option of this second embodiment, the embodiment Figs. 3 to 5 show that the support means supports the two conveyor guides (30) in a box-forming machine (100) (B), and the two conveyor guides (30) are supported on the chassis (1) thereof.

In an alternative option of this second embodiment, the embodiments of Figs. 6 to 9 show that the support means supports the two conveyor guides (30) on an auxiliary chassis (121), independent of the chassis (1) of a machine (100) forming boxes (B).

In the embodiment of Fig. 6, the support means is fixed to an auxiliary chassis (121) of an auxiliary conveyor (120), which further comprises a movable transport element (122) by an auxiliary drive member (123), the which will be described later.

Figs. 3 to 7 show that, in the box forming machine (100), a core (15) is insertable and removable according to a vertical direction (Z) with respect to the forming cavity (52), defined by a series of forming elements arranged around it, to fold and join some parts of the plate with others and convert this plate into a formed box (B). The core (15) is movable by means of a core drive (10) comprising an arm (11) at the end of which the core (15) is supported and driving means (13), for example, an electric motor, which is configured to move the male in and out of the cavity (52).

In the particular embodiment of Fig. 9, the upper parts of the conveyor guides (30) are movable by means of a drive member (40), preferably an electric motor. In Fig. 9, the upper part of each conveyor guide (30) is rough enough to favor the dragging of the boxes (B), in the aforementioned lower parts of the two mutually opposite rims (R) of each of the boxes. (B), by means of the motor member (40), preferably without unwanted slipping between the lower parts of the rims (R) and the upper parts of the conveyor guides (30).

In Fig. 9, each of the two conveyor guides (30) is materialized, preferably, in a respective endless conveyor belt, band or chain, mounted on turning elements at their ends (30a, 30b), and these belts being or movable band by means of said motor member (40).

In Fig. 9, the upper parts of the conveyor guides (30) are configured for a double functionality: to contact and support two lower parts of respective opposite rims (R) of the boxes (B), to transport these boxes (B) .

In Figs. 3 to 6, the conveyor (20) additionally comprises a movable transport element (122), preferably materialized in materialized in an endless conveyor belt, band or chain, to transport the boxes (B), from the delivery end (30b) from the conveyor guides (30) to an additional delivery end located after the delivery end (30b) following a predetermined additional transport path (T2).

In Figs. 3 to 6, the movable transport element (122) is integrated in an auxiliary conveyor (120) whose box reception area (B) is located below the two conveyor guides (30).

In another embodiment of Figs. 7 and 8, the support means supports the two conveyor guides (30), directly or indirectly, on the chassis (1) of the box forming machine. The configuration and structure of the conveyor 20 is analogous to that of the embodiment of Figs. 1 and 2, except that the conveyor guides (30) are essentially aligned with the horizontal. The embodiment of Figs. 7 and 8 may or may not be provided with the positional and/or tilt regulators described later and shown in detail in Figs. 1 and 2.

In Figs. 7 and 8, the conveyor (20) further comprises at least one movable transport element (122).

Specifically, in Figs. 7 and 8 the conveyor (20) comprises a plurality of movable transport elements (122) spacedly mounted on a belt, chain or endless band (124) movable by means of the auxiliary drive member (123), materialized in an auxiliary motor.

The movable transport element(s) (122) are configured to transport the boxes (B) from the receiving end (30a) to the delivery end (30b) according to the predetermined transport path (T1).

Alternatively to Figs. 1 to 6, the conveyor guides (30) can be essentially aligned with the horizontal to transport the boxes (B) horizontally.

Likewise, in an option not shown in Figs. 1 to 6, the predetermined additional transport path (T2) may be essentially aligned or horizontally aligned to horizontally transport the boxes (B).

Preferably, the conveyor (20) further comprises a tilt adjuster (27, 28) supported on the support means and shown in detail in Figs. 1 and 2. The inclination regulator (27, 28) is configured to regulate the inclination of the guides conveyors (30) relative to the horizontal about a horizontally disposed axis (E1) in use, for example, as shown in Figs. 3 to 6.

In Figs. 1 to 6, the inclination of the conveyor guides (30) is regulated by unlocking the locking and unlocking elements (29), one located on each side of the conveyor guides (30). Afterwards, the conveyor guides (30) are rotated to the desired inclination (either downward or horizontal inclination), pivoting around respective joints (29) where the conveyor guides (30) are articulated, and the blocking elements are locked and release (29) again in this new inclination.

Preferably, all of the embodiments comprise a transverse position regulator (23a, 21b), supported on the support means, such as the one shown in Figs. 1 and 2. This transversal position regulator (23a, 21b) is configured to regulate the transversal separation distance (DS) between the conveyor guides (30), varying the separation distance between one support (21, 23) and the other support (21, 23) of the half support along a transverse direction (Y) perpendicular to the vertical direction (Z).

Optionally, the transversal position regulator (23a, 21b) comprises a locking and unlocking element (21b) configured to lock and release each support (21, 23) in a fixing position, and guide elements (23a) configured to guide the supports (21, 23) along the transverse direction (Y).

The transverse positioning of one support (21, 23) with respect to the other support (21, 23) is carried out by unlocking the locking and unlocking elements (21b), one located on each side of the conveyor guides (30). Afterwards, the supports are positioned relative to each other to their new positions along the transverse direction (Y) in a guided manner thanks to the guiding elements (23a), preferably materialized in recesses that define flat guiding surfaces. Finally, the locking and unlocking elements (21b) are locked again in the desired position.

In Figs. 1 and 2, the locking and unlocking elements (21b) are screws.

Following, in Figs. 1 and 2, the conveyor (20) further comprises a longitudinal position regulator (27, 27b) supported on the support means. The longitudinal position regulator (27, 27b) is configured to regulate the position of the conveyor guides (30) along a longitudinal direction (X), towards and away from the cavity (52) of the machine (100) that forms boxes (B). Refer to Figs. 5 to 7.

The longitudinal positioning of the conveyor guides (30) is regulated by unlocking the locking and unlocking elements (29), one located on each side of the conveyor guides (30), which allow the respective horizontal bars (27) fitted in a flange, preferably formed by a cover (26) and back cover or package (24), to be positioned in a guided manner, along the longitudinal direction (X) . Finally, the locking and unlocking elements (29) are locked again in the desired position.

Following, in Figs. 1 and 2, the conveyor (20) further comprises a vertical position regulator (25, 23b) supported on the support means. The linear position adjuster (25, 23b) is configured to adjust the position of the conveyor guides (30) according to the vertical direction (Z).

The vertical positioning of the conveyor guides (30) is regulated by unlocking the locking and unlocking elements (23b), one located on each side of the conveyor guides (30), which allows the respective embedded vertical bars (23c) to be positioned in a guided manner. in a flange, preferably formed by an auxiliary cover (25) and the back cover or package (24), along the vertical direction (X). Finally, the locking and unlocking elements (23b) are locked again in the desired position.

Claims (15)

1. - Conveyor (20) of cardboard boxes (B) with rims (R) located in the upper part of the side walls (PL) of the same and folded towards the outside of these, the conveyor (20) comprising two guides conveyors (30) elongated and aligned with each other following a transport path (T1), and facing and separated from each other a separation distance (DS) perpendicular to the transport path (T1), characterized because the two conveyor guides (30) are configured so that the lower parts of respective opposite rims (R) arising from respective mutually opposite side walls (PL) of the box (B) come into contact, each with a corresponding upper part of the conveyor guides (30), along the transport path (T1) and from a receiving end (30a) to a delivery end (30b) of said conveyor guides (30), to guide the boxes (B) during its transportation. Conveyor (20) according to claim 1, wherein the two conveyor guides (30) are configured so that the bottoms of respective opposite rims (R) arising from respective mutually opposite side walls (PL) of the box (B) ) slide and are supported, each with the corresponding smooth upper part of the conveyor guides (30), along the transport path (T1), from the receiving end (30a) to the delivery end (30b) of said conveyor guides (30), to slide and support the boxes (B) during their transport. Conveyor (20) according to claim 1 or 2, comprising support means supporting the two conveyor guides (30). 4. Conveyor (20) according to claim 3, wherein the conveyor guides (30) are fixed by the support means in a position located below the outlet of an outlet mouth of a cavity (52) forming a box forming machine (100). 5. Conveyor (20) according to claim 3 or 4, wherein the support means supports the two conveyor guides (30) in a box (B) forming machine (100). 6. Conveyor (20) according to any of the preceding claims, further comprising at least one movable transport element (122) to transport the boxes (B), at least partially, from the receiving end (30a) to the delivery end (30b) according to the predetermined transport path (T1), and/or from the end end (30b) to an additional delivery end located next to the delivery end (30b) following a predetermined additional transport path (T2). 7. Conveyor (20) according to claim 6, wherein the movable transport element (122) is integrated into an auxiliary conveyor (120) whose box reception area (B) is located below the two conveyor guides (30). ). 8. Conveyor (20) according to any one of claims 1, 3, 4 or 5, wherein the upper parts of the conveyor guides (30) are movable by means of a motor member (40) and are rough to favor the dragging of the boxes (B), in the aforementioned lower parts of the two mutually opposite rims (R) of each one of the boxes (B), by means of the drive member (40). 9. Conveyor (20) according to any one of claims 3 to 8, wherein the support means comprises two supports (21, 23; 21, 23), each of them to support a respective conveyor guide (30). 10. Conveyor (20) according to claim 9, further comprising a transversal position regulator (23a, 21b) configured to regulate the transversal separation distance (DS) between the conveyor guides (30), varying the separation distance between respective supports (21, 23; 21, 23) of the half support along a transverse direction (Y) perpendicular to the vertical direction (Z). 11. Conveyor (20) according to claim 10, wherein the transverse position regulator comprises a locking and unlocking element (21b) configured to lock and release each support (21, 23) in a fixing position, and locking elements guide (23a) configured to guide the supports (21, 23) along the transverse direction (Y). 12. Conveyor (20) according to claim 4, further comprising a longitudinal position regulator (27, 27b) configured to regulate the position of the conveyor guides (30) according to a longitudinal direction (X) towards and away from the cavity (52). 13. Conveyor (20) according to any of the preceding claims, further comprising a vertical position regulator (25, 23b) configured to regulate the position of the conveyor guides (30) according to the vertical direction (Z). 14. Conveyor (20) according to claim 3, 4 or 5, further comprising a regulator of inclination (27, 28) supported on the support means, configured to regulate the inclination of the conveyor guides (30) with respect to the horizontal around an axis (E1) horizontally arranged in use. 15. Conveyor (20) according to any one of claims 1 to 7 and 9 to 14, wherein the upper parts of the conveyor guides (30) are smooth, linear, and have a downward slope with respect to the horizontal.