A transfer device for transferring products from a first transport line to a second transport line

Abstract

The transfer device (100) comprises at least a pair of pickup heads (1) for picking up products from a first transport line (L1) and for transferring the products onto a second transport line (L2), after having rotated by 180° by means of a rotation by 180° of the pickup heads. During the rotation by 180°, each pickup head tilts the products so that they do not collide with the products retained by the other pickup head.

Description

[0001] A TRANSFER DEVICE FOR TRANSFERRING PRODUCTS FROM A FIRST TRANSPORT LINE TO A SECOND TRANSPORT LINE

[0002] FIELD OF THE INVENTION

[0003] The present invention relates to the technical sector relating to the packaging of products, for example in solid or liquid form, in respective containers, such as for example blister packs, vials, which are then to be inserted into boxes or cartons.

[0004] DESCRIPTION OF THE PRIOR ART

[0005] Products exiting from the relative forming machines are usually transported along a first transport line towards a transfer area at which they are collected from the first transport line to be transferred and positioned on a second transport line destined to the transport thereof towards successive production steps.

[0006] According to the type and shape of the products, or on the basis of packaging requirements, the products collected from the first transport line can be required to be transferred onto the second transport line after having been subjected to a rotation, for example by 180°.

[0007] For example, in the case of products constituted by a series of vials connected to one another, such as for example single-dose vials containing liquid substances, which are to be stacked one upon another before being inserted into a respective box, it can be necessary to carry out a rotation thereof by 180° before arranging them above the other vials already positioned on the second transport line, with the aim of preventing the vials arranged in a stack from all tilting on a same side.

[0008] Figure 1 illustrates the situation described in the preceding, where some of the products transported by a first transport line (L1) have been transferred and released onto a second transport line (L2) rotated by 180°.

[0009] For production reasons, usually a contemporary collection is made of more than one product at a time.

[0010] In a case where the distance, or pitch (P) between two successive products transported by the first transport line (L1) is smaller than the dimension (D) of the products in the transversal direction to the transport direction thereof, as shown in figure 1, there exists the problem of how to carry out the rotation by 180° thereof, without their impacting on one another.

[0011] A first known solution includes carrying out the rotation of the products after they have been transferred and deposited onto the second transport line, with the use of handling organs which are activated to pick up single products and perform the rotation thereof by 180° and the successive repositioning thereof on the second transport line, for example above other products already present.

[0012] A solution of this type, however, has various drawbacks.

[0013] Primarily, it is necessary to predispose a special operating space for the positioning and movement of the handling organs, with a consequent increase of the overall size.

[0014] Further, wait times for the transfer of the products will increase from the second transport line towards the packaging machine, with consequent negative repercussions on productivity.

[0015] Another known solution includes using a transfer device comprising a support frame of pickup heads provided with pickup means, wherein the support frame is movable to move the pickup heads between the first transport line and the second transport line, and vertically, in such a way that the pickup means can collect and release the products, to carry out the transfer from the first transport line to the second transport line.

[0016] The pickup heads are mounted on the support frame in such a way that they can be translated with respect to one another in a moving away / nearing direction, so as to be able to vary their reciprocal distance, as well as to be activated in rotation with respect to a vertical rotation axis.

[0017] The support frame is positioned above the first transport line, and therefore lowered in such a way that the pickup means of the pickup heads can collect the products arranged there.

[0018] Thus, once the support frame is raised from the first transport line, with the pickup means of the pickup heads retaining the products, before or during the movement of the support frame towards the second transport line, the pickup heads are reciprocally translated in a moving away direction from one another, so as to space the products away from one another by a distance such as to then enable, following the successive rotation of the pickup heads about the respective vertical rotation axes, rotation of the products by 180° without being able to strike or bump into one another.

[0019] Lastly, after having carried out the rotation of the products, the pickup heads must be newly reciprocally translated in order to be neared to one another, before the support frame positions the pickup heads above the second transport line and is lowered towards the second transport line in order to allow the pickup heads to release the products to rest on the second transport line.

[0020] A solution of this type is constructionally complicated and complex, and, further, in the case of a size change of the products, it can require the replacement or modification of components and adjustments not rapidly attainable.

[0021] SUMMARY OF THE INVENTION

[0022] The aim of the present invention is therefore to provide a new transfer device for transferring products from a first transport line to a second transport line that is able to obviate the above-mentioned drawbacks present in the prior art and in what is cited in the foregoing.

[0023] In particular, an aim of the present invention is therefore to provide a new transfer device for transferring products from a first transport line to a second transport line, which enables carrying out transfer of products with a contemporaneous rotation by 180° in a simple and effective way.

[0024] The above aims are attained according to the claims.

[0025] BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The characteristics of a preferred, but not exclusive, embodiment of the transfer device proposed by the present invention will be described in the following with reference to the appended tables of drawings, in which:

[0027] - figure 1, already mentioned in the foregoing, illustrates, in a schematic view from above, a first transport line of products and a second transport line of products onto which products collected from the first transport line, following a rotation by 180°, are transferred;

[0028] - figure 2A illustrates, in an entirely schematic way, and in a view from above, the transfer device of the invention, schematically represented by a rectangle, positioned above a first transport line for picking up the products transported by the first transport line, for example during a pause thereof, where the distance between the products is smaller than the dimension of the products in a transversal direction with respect to the advancement direction of the first transport line;

[0029] - figure 2B illustrates, in an entirely schematic way, and in a view from above, the transfer device of the invention, schematically represented by a rectangle, positioned above a second transport line for the release of the products collected from the first transport line after they have been rotated by 180°;

[0030] - figure 3A illustrates, according to a frontal view, the transfer device of the invention in a first operating configuration in which it is arranged above the first transport line in a pick-up and collecting position of products present on the first transport line, in conjunction, for example, with a pause of the first transport line;

[0031] - figure 3B is a lateral view of figure 3A;

[0032] - figure 4A illustrates, in a frontal view, the transfer device of the invention arranged above the second transport line in a second operating configuration in which it is arranged above the second transport line in a release position of the products, with the products having been rotated by 180° with respect to the orientation and arrangement they had on the first transport line, in conjunction, for example, with a pause of the second transport line;

[0033] - figure 4B is a lateral view of figure 4A;

[0034] - figure 5A illustrates, in a schematic frontal view, an operating configuration of the transfer device of the invention during the transfer of the products from the first transport line to the second transport line in which the products are in a step of rotation and are in an inclined orientation;

[0035] - figure 5B is a lateral view, partially in perspective, of figure 5A;

[0036] - figure 6 schematically illustrates the transfer device of the invention in three distinct and successive positions, respectively of picking up the products from the first transport line, transferring the products from the first transport line towards the second transport line with a contemporaneous rotation of the products, and releasing the products, once rotated by 180°, onto the second transport line;

[0037] - figure 7 is the section view along section plane l-l of figure 3B; - figure 8 is the section view along section plane ll-ll of figure 5B;

[0038] - figure 9A is a partial schematic view in vertical section of a possible variant embodiment of the transfer device of the invention;

[0039] - figure 9B is a partial schematic view of a component of the transfer device in the possible variant embodiment of figure 9A.

[0040] DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0041] With reference to the accompanying tables of drawings, numerical reference (100) denotes the transfer device for transferring products from a first transport line (L1) to a second transport line (L2).

[0042] The transfer device (100) of the invention is suitable for carrying out transfer of products from a first transport line (L1) to a second transport line (L2) in all cases in which the products (A) are arranged on the first transport line (L1) spaced from one another by a distance (P) that is smaller than a dimension thereof in a transversal direction to a transport direction (T) of the first transport line (L1), such as for example illustrated in figure 1.

[0043] The transport device (100) comprises a frame (10) and at least a pair of pickup heads (1) borne by the frame (10).

[0044] The frame (10) is movable with respect to the first transport line (L1) and with respect to a second transport line (L2) to position the pickup heads (1) above the first transport line (L1) (see for example figure 2A or figures 3A and 3B), for collecting the products (A) present on the first transport line (L1) and to position the pickup heads (1) above the second transport line (L2) for release of the products (A) onto the second transport line (L2) (see for example figure 2B or figures 4A and 4B).

[0045] The actuator means for the movement of the frame (10) in space, in particular for the vertical translation thereof in a nearing / moving away direction from the first transport line and the second transport line, as well as for the translation thereof from the first transport line to the second transport line, have not been illustrated as they are of known type and not relevant to the present invention. Each pickup head (1) of the at least a pair of pickup heads (1) is made in such a way as to comprise: a rotation shaft (3), drivable in rotation with respect to the frame (10) about a vertical driving axis (V); a first body (31) coupled to the rotation shaft (3) so as to be set in rotation, when the rotation shaft (3) is driven in rotation about the vertical driving axis (V), and coupled to the rotation shaft (3) in such a way as to be rotatable with respect to the rotation shaft (3) about an oscillation axis (O) that is perpendicular to the vertical driving axis (V) of the rotation shaft (3); pickup and release means (30), which are borne by the first body (31), for picking up and releasing products (A).

[0046] For example, the first body (31) can be coupled to the rotation shaft (3) by use of pins that are coupled to the rotation shaft in mutually opposite positions, defining the oscillation axis (O) of the first body with respect to the rotation shaft, and with the interpositioning of bearings, in such a way that the pins can rotate with respect to the bearings and thus enable the rotation of the first body with respect to the rotation shaft about the oscillation axis (O) (see for example figure 7).

[0047] The pick-up and release means (30) can be of the pneumatic type, i.e. aspirating, such as for example illustrated in the appended figures, but also of another type, for example mechanical, using grippers or the like.

[0048] In the preferred embodiment illustrated in the figures of the drawings, the first body is hollow so as to house internally thereof at least an end portion of the rotation shaft, to which the first body is coupled, and to allow the passage of the suction pipes of the pick-up and release means, in the case where they are of the pneumatic type.

[0049] Each pickup head (1) of the at least a pair of pickup heads (1) is further made in such a way as also to comprise: a second hollow body (32), which is mounted on the frame (10), coaxially to the rotation shaft (3), with the second body (32) being made in such a way as to annularly comprise a cam guide profile (40) which is conformed in such a way as to extend according to an annular path having descending annular portions (41) and ascending annular portions (42) with respect to a plane that is transversal and perpendicular to the vertical driving axis (V) of the rotation shaft (3); a pair of rollers (51, 52) which are mounted opposite one another on the first body (31) rotatably about a rotation axis (Z) and in a manner such as to be in contact with the cam guide profile (40) of the second body (32), so that when the rotation shaft (3) is driven in rotation about the vertical driving axis (V), and the first body (31) is consequently activated in rotation, the rollers (51, 52) rotate along the cam guide profile (40) of the second body (32).

[0050] Each pickup head (1) is activatable in synchrony with the other pickup head (1) and is configured in such a way that the first body (31), the second body (32) and the pair of rollers (51, 52) are reciprocally arranged, and wherein the descending annular portions (41) and ascending annular portions (42) of the annular path of the cam guide profile (40) are reciprocally arranged and conformed, in such a way that the following conditions ensue as a function of the angular position assumed by the rotation shaft (3) and as a function of the rotational actuation of the rotation shaft (3).

[0051] With the rotation shaft (3) positioned in a first angular position (A1) with respect to the frame (10) and to the second body (32) (see for example figures 3A, 3B and the image on the right of figure 6), the first body (31) is in a first orientation (01) with the rollers (51, 52) being positioned in a first position (P1) along the cam guide profile (40) in which a first roller (51) is in an intermediate position along a descending annular portion (41) and a second roller (52) is in an intermediate position along an ascending annular portion (42) of the annular path of the cam guide profile (40), in such a way that the first body (31) is arranged coaxial to the rotation shaft (3) and the pickup and release means (30) are arranged and orientated to be able to pick up the products (A) present on the first transport line (L1) when the frame (10) is moved above the first transport line (L1).

[0052] With the rotation shaft (3) positioned in a second angular position (A2) with respect to the frame (10) and to the second body (32) rotated by 180° with respect to the first angular position (A1) (see for example figures 4A, 4B and the image on the right of figure 6), the first body (31) is in a second orientation (02) rotated by 180° with respect to the first orientation (01) with the rollers (51 , 52) being positioned in a second position (P2) along the cam guide profile (40) rotated by 180° with respect to the first position (P1) and wherein the first roller (51) is in an intermediate position along an ascending annular portion (42) and the second roller (52) is in an intermediate position along a descending annular portion (41) of the annular path of the cam guide profile (40), in such a way that the first body (31) is arranged coaxial to the rotation shaft (3) and the pickup and release means (30) are arranged and orientated so as to be able to release the products rotated by 180° onto the second transport line (L2) when the frame (10) is moved above the second transport line (L2).

[0053] When the rotation shaft (3) is driven in rotation with respect to the frame (10) and to the second body (32) in a first rotation direction (V1) (see for example figures 5A and 5B and the central image of figure 6) from the first angular position (A1) to the second angular position (A2) (for example in an anticlockwise rotation direction as illustrated in figures 5A, 5B, and 6), the first body (31), on which the rollers (51, 52) are mounted, is also activated in rotation in the first rotation direction (V1) from the respective first orientation (01) to the respective second orientation (02),

[0054] In this way, the rollers (51, 52) mounted on the first body (31), which is rotating together with the rotation shaft (3), and when moving from the respective first position (P1) thereof towards the respective second position (P2) along the cam guide profile (40): firstly roll with the first roller (51) along a descending annular portion (41) of the cam guide profile (40) and with the second roller (52) along an ascending annular portion (42) of the annular path of the cam guide profile (40), determining an inclination of the first body (31), and of the pickup and release means (30), about the oscillation axis (O) of the first body (31) with respect to the rotation shaft (3), thus tilting the products (A) retained by the pickup and release means (30) (see figure 5B, central image of figure 6, and figure 8), and preventing the products (A) from colliding with the products retained by the pickup means of the other pickup head (see figure 5A), and then the rollers (51, 52) roll with the first roller (51) along an ascending annular portion (42) and with the second roller (52) along a descending annular portion (41) of the annular path of the cam guide profile (40) reaching the second position (P2) thereof, bringing the body (31) into the respective second orientation (02) with the pickup and release means (30) being able to release the products rotated by 180° onto the second transport line (L2) when the frame (10) is moved above the second transport line (L2) (see for example the image on the right of figure 6).

[0055] Therefore, owing to the special characteristics as described in the foregoing, relative to the presence and conformation of the cam guide profile on the second body, of the rollers mounted on the first body, which is rotatable about an oscillation axis perpendicular to the vertical driving axis of the rotation shaft, and with the rollers being arranged in such a way as to be in contact with the cam guide profile, each time the rotation shaft is activated in rotation so as to be brought from the first angular position to the second angular position, with the aim of rotating the products collected from the first transport line by 180°, it will be possible to tilt the pickup and release means, and therefore the products retained thereby, so that they do not collide with the products retained by the adjacent pickup head, during the transfer thereof from the first transport line to the second transport line.

[0056] Therefore, with the transfer device of the invention it is possible to transfer products, which are arranged on a first transport line at a reciprocal distance that is smaller than the dimension thereof in transversal direction to the transport direction, to a second transport line at the same time carrying out a 180° rotation thereof by means only of a simple rotation of the rotation shaft of each of the pickup heads borne by the frame, and thus without the need to carry out further and other types of reciprocal movements and translations of the pickup heads as already occurs in the prior art.

[0057] Once the products have been released, rotated by 180°, onto the second transport line, the rotation shaft of each of the pickup heads can be rotated by 180° in a second rotation direction opposite the first direction, or can be rotated again in the first rotation direction, by a further 180°, in order to be returned into the respective first angular position, in order to return, following the rolling of the rollers along the cam guide profile, the first body into the first orientation with the pickup and release means arranged and orientated in order to be able to pick up successive products from the first transport line when the frame is moved and newly arranged above the first transport line.

[0058] The transfer device of the invention can also be designed with the presence of more than two pickup heads, each of which being realised as described in the foregoing.

[0059] The driving in rotation of the rotation shafts of the pickup heads can be done using a single motor, mounted on the frame, and with a gear system (for example cogged wheels, racks), mutually enmeshing with one another and connected to the single motor and to the rotation shafts, or by means of a system of belts or other transmission devices of motion known to the expert in the sector, and for this reason not illustrated in detail.

[0060] Further and other advantageous characteristics of the transfer device of the invention are described in the following.

[0061] Each pickup head (1) is realised and configured in such a way that the pair of rollers (51 , 52) is mounted on the first body (31) in such a way that the rotation axis (Z) of the rollers (51 , 52), when the rotation shaft (3) is positioned in the first angular position (A1) and in the second angular position (A2), lies on a plane that is perpendicular to a plane containing the vertical driving axis (V) of the rotation shaft (3) and the oscillation axis (O) of the first body (31).

[0062] The extension, inclination and annular extension of the descending and ascending portions of the annular path of the cam guide profile, present in the second body, can be realised and configured as a function of the transversal dimensions of the various types of products, and by the reciprocal distances thereof, which can be transported by the first transport line, and as a function of the inclination that is desired for the products during the rotation thereof with the purpose of preventing reciprocal collisions.

[0063] In a possible preferred, though not exclusive, embodiment is illustrated in figures from 3A to 8, the cam guide profile (40) is realised along an annular lower edge of the second body (32) with the pair of rollers (51 , 52) being mounted in proximity of an upper edge of the first body (31) in such a way that the rollers (51 , 52) are in contact with the cam guide profile (40).

[0064] In another possible embodiment, such as for example illustrated in figures 9A and 9B, the cam guide profile (40) can be realised internally of an annular groove (320), or a dragging / rolling pathway, peripherally realised along a lateral wall of the second body (32), with the pair of rollers (51 , 52) being mounted on a respective pair of arms (61 , 62) borne by the second body (31) in such a way that the rollers (51 , 52) are positioned internally of the annular groove (320) and in contact with the cam guide profile (40).

[0065] Other and different modes of realisation can be included of the cam guide profile in the second body and of the arrangement of the rollers which in any case are to be borne by the first body and arranged in such a way as to couple with the cam guide profile.

[0066] In an advantageous aspect, the second body (32) is mounted on the frame (10) by means of interpositioning of elastic means (6) which are arranged between the second body (32) and the frame (10).

[0067] In particular, the elastic means (6) are configured and conformed in such a way as to maintain the second body (32) pushed towards the pair of rollers (51 , 52) and to maintain the reciprocal coupling thereof elastic so as to compensate for any eventual errors of tolerance in the realisation of the cam guide profile (40) and / or in the arrangement of the rollers (51, 52) and / or of the second body (32) with respect to the frame (10).

[0068] For example, in the preferred embodiment illustrated in the figures of the drawings, the frame can comprise vertical spurs that insert in the housings present in the second body, with the second body fixed to the spurs, for the coupling to the frame, by fastening elements, for example bolts.

[0069] The elastic means, in this case, comprise springs which are mounted in the housings coaxially to the spurs, and have the ends thereof respectively in contact with a wall of the frame and with a wall of the housing.

Claims

CLAIMS1) A transfer device (100) for transferring products from a first transport line (L1) to a second transport line (L2), wherein the products (A) are arranged on the first transport line (L1) spaced from one another by a distance (P) that is smaller than a dimension thereof in a transversal direction to a transport direction (T) of the first transport line (L1), comprising: a frame (10); at least a pair of pickup heads (1) borne by the frame (10); wherein the frame (10) is movable with respect to the first transport line (L1) and with respect to a second transport line (L2) to position the pickup heads (1) above the first transport line (L1), for collecting the products (A) present on the first transport line (L1) and to position the pickup heads (1) above the second transport line (L2) for release of the products (A) onto the second transport line (L2); wherein each pickup head (1) of the at least a pair of pickup heads (1) comprises: a rotation shaft (3), drivable in rotation with respect to the frame (10) about a vertical driving axis (V); a first body (31) coupled to the rotation shaft (3) so as to be set in rotation, when the rotation shaft (3) is driven in rotation about the vertical driving axis (V), and coupled to the rotation shaft (3) in such a way as to be rotatable with respect to the rotation shaft (3) about an oscillation axis (O) that is perpendicular to the vertical driving axis (V) of the rotation shaft (3); pickup and release means (30), borne by the first body (31), for picking up and releasing products (A); a second hollow body (32), mounted on the frame (10), coaxially to the rotation shaft (3), wherein the second body (32) is made in such a way as to annularly comprise a cam guide profile (40) which is conformed in such a way as to extend according to an annular path having descending annular portions (41) and ascending annular portions (42) with respect to a plane that is transversal and perpendicular to the vertical driving axis (V) of the rotation shaft (3); a pair of rollers (51, 52) which are mounted opposite one another on the firstbody (31) rotatably about a rotation axis (Z) and in such a manner as to be in contact with the cam guide profile (40) of the second body (32), so that when the rotation shaft (3) is driven in rotation about the vertical driving axis (V), and the first body (31) is consequently activated in rotation, the rollers (51, 52) rotate along the cam guide profile (40) of the second body (32); wherein each pickup head (1) is activatable in synchrony with the other pickup head (1) and is configured in such a way that the first body (31), the second body (32) and the pair of rollers (51, 52) are reciprocally arranged, and wherein the descending annular portions (41) and ascending annular portions (42) of the annular path of the cam guide profile (40) are reciprocally arranged and conformed, in such a way that: with the rotation shaft (3) positioned in a first angular position (A1) with respect to the frame (10) and to the second body (32), the first body (31) is in a first orientation (01) with the rollers (51, 52) being positioned in a first position (P1) along the cam guide profile (40) in which a first roller (51) is in an intermediate position along a descending annular portion (41) and a second roller (52) is in an intermediate position along an ascending annular portion (42) of the annular path of the cam guide profile (40), in such a way that the first body (31) is arranged coaxial to the rotation shaft (3) and the pickup and release means (30) are arranged and orientated so as be able to pick up the products (A) present on the first transport line (L1) when the frame (10) is moved above the first transport line (L1); with the rotation shaft (3) positioned in a second angular position (A2) with respect to the frame (10) and to the second body (32) rotated by 180° with respect to the first angular position (A1), the first body (31) is in a second orientation (02) rotated by 180° with respect to the first orientation (01) with the rollers (51 , 52) being positioned in a second position (P2) along the cam guide profile (40) rotated by 180° with respect to the first position (P1) and wherein the first roller (51) is in an intermediate position along an ascending annular portion (42) and the second roller (52) is in an intermediate position along a descending annular portion (41) of the annular path of the cam guide profile (40), in such a way that the first body (31) is arranged coaxial to the rotation shaft (3) and the pickup and release means (30) are arranged andorientated so as to be able to release the products rotated by 180° onto the second transport line (L2) when the frame is moved above the second transport line (L2); when the rotation shaft (3) is driven in rotation with respect to the frame (10) and to the second body (32) in a first rotation direction (V1) from the first angular position (A1) to the second angular position (A2), the first body (31), on which the rollers (51 , 52) are mounted, is also activated in rotation in the first rotation direction (V1) from the respective first orientation (01) to the respective second orientation (02) so that the rollers (51 , 52), by moving from their respective first position (P1) towards their respective second position (P2) along the cam guide profile (40), firstly roll with the first roller (51) along a descending annular portion (41) of the cam guide profile (40) and with the second roller (52) along an ascending annular portion (42) of the annular path of the cam guide profile (40), determining an inclination of the first body (31), and of the pickup and release means (30), about the oscillation axis (O) of the first body (31) with respect to the rotation shaft (3), thus tilting the products (A) retained by the pickup and release means (30) and preventing the products (A) from colliding with the products retained by the pickup means of the other pickup head, and then the rollers (51 , 52) roll with the first roller (51) along an ascending annular portion (42) and with the second roller (52) along a descending annular portion (41) of the annular path of the cam guide profile (40) reaching the second position (P2) thereof, bringing the body (31) into the respective second orientation (02) with the pickup and release means (30) being able to release the products rotated by 180° onto the second transport line (L2) when the frame (10) is moved above the second transport line (L2).2) The transfer device (100) as claimed in claim 1 , wherein the pair of rollers (51 , 52) is mounted on the first body (31) in such a way that the rotation axis (Z) of the rollers (51, 52), when the rotation shaft (3) is positioned in the first angular position (A1) and in the second angular position (A2), lies on a plane that is perpendicular to a plane containing the vertical driving axis (V) of the rotation shaft (3) and the oscillation axis (O) of the first body (31).3) The transfer device (100) as claimed in claim 2, wherein the cam guide profile (40) is realised along an annular lower edge of the second body (32)and wherein the pair of rollers (51, 52) is mounted in proximity of an upper edge of the first body (31) in such a way that the rollers (51, 52) are in contact with the cam guide profile (40).4) The transfer device (100) as claimed in claim 2, wherein the cam guide profile (40) is realised internally of an annular groove (320) peripherally realised along a lateral wall of the second body (32) and wherein the pair of rollers (51, 52) is mounted on a respective pair of arms (61, 62) borne by the second body (31) in such a way that the rollers (51, 52) are positioned internally of the annular groove (320) and in contact with the cam guide profile (40).5) The transfer device (100) as claimed in any one of the preceding claims, wherein the second body (32) is mounted on the frame (10) by means of interpositioning of elastic means (6) which are arranged between the second body (32) and the frame (10), and which are configured and conformed in such a way as to maintain the second body (32) pushed towards the pair of rollers (51 , 52) and to maintain the reciprocal coupling thereof elastic so as to compensate for any eventual errors of tolerance in the realisation of the cam guide profile (40) and / or in the arrangement of the rollers (51, 52) and / or of the second body (32) with respect to the frame (10).

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