(19)
(11)EP 3 509 974 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
04.11.2020 Bulletin 2020/45

(21)Application number: 17777655.6

(22)Date of filing:  05.09.2017
(51)International Patent Classification (IPC): 
B65G 54/02(2006.01)
B66F 9/07(2006.01)
(86)International application number:
PCT/IB2017/055325
(87)International publication number:
WO 2018/047059 (15.03.2018 Gazette  2018/11)

(54)

A TRANSPORT SYSTEM

TRANSPORTSYSTEM

SYSTÈME DE TRANSPORT


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 12.09.2016 IT 201600091512

(43)Date of publication of application:
17.07.2019 Bulletin 2019/29

(73)Proprietor: Marchesini Group S.p.A.
40065 Pianoro (Bologna) (IT)

(72)Inventor:
  • MONTI, Giuseppe
    40065 Pianoro (Bologna) (IT)

(74)Representative: Dall'Olio, Christian et al
INVENTION S.r.l. Via delle Armi, 1
40137 Bologna
40137 Bologna (IT)


(56)References cited: : 
EP-A1- 0 823 395
DE-A1- 3 808 244
US-A1- 2016 031 648
EP-A1- 1 101 682
JP-A- 2001 171 512
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    FIELD OF THE INVENTION



    [0001] The present invention relates to a transport system for transport of products.

    DESCRIPTION OF THE PRIOR ART



    [0002] In the sector of automatic work machines, there is a known need to transport products, objects, articles, components etc. (such as for example containers on which predetermined operations are to be made) along a predefined pathway so as to be able to know, exactly and precisely, the position and orientation thereof in relation to specific working steps which are to be carried out.

    [0003] A type of transport system used for transport of products comprises at least a mobile carriage, for transport of at least a relative product, and at least a guide rail having a looped pathway along which the carriage is guided and moved, by relative motor means, such as for example linear motors, or loop-wound conveyor belts on relative drive pulleys.

    [0004] In this regard, the transport system also comprises a series of rollers, having a cylindrical shape, which are predisposed on the carriage in such a way as to engage the guide rail, the guide rail being conformed so as to have an internal rolling wall and an external rolling wall.

    [0005] In particular, there are rollers predisposed on the carriage in such a way that the rollers are in contact with and can roll on the internal wall of the guide rail, and there are rollers predisposed on the carriage in such a way that they are in contact with and can roll on the external wall of the guide rail, so as to be able to guarantee the stability of orientation and position of the carriage during the movement thereof along the guide rail.

    [0006] The contact between the lateral cylindrical wall of the rollers and the walls, internal and external, of the guide rail is therefore of a linear type.

    [0007] The guide rail, as mentioned above, has a closed loop-wound shape, and comprises two straight portions and two curved portions for linking the straight portions.

    [0008] A first drawback of these transport systems consists in the stability of the carriage during the passage thereof from a straight portion to a curved portion, as some of the rollers can lose contact with the internal wall or external wall of the guide rail and therefore the other rollers are subjected to a greater rolling friction.

    [0009] The onset of these circumstances not only influences the stability of the carriage, with repercussions on the correct orientation and positioning of the product to be transported, but also determines more rapid wear on the rollers.

    [0010] Document US2016/0031648 relates to a transport system for transporting products of the above-described type, which aims at reducing the degree of wear on the rollers.

    [0011] The transport system described in the above-mentioned document comprises a mobile carriage for transport of at least a product and a loop-wound guide rail along which the carriage is guided and moved by motor means.

    [0012] In this regard, the transport system comprises a first group of rollers and a second group of rollers that are predisposed and mounted on the carriage for transport thereof along the guide rail.

    [0013] The guide rail is conformed so as to have an internal rolling wall and at least an external rolling wall for rolling of the rollers mounted on the carriage and comprises a loop-wound shape, with two straight portions and two curved portions connecting the two straight portions.

    [0014] In particular, the transport system described in document US2016/0031648 is configured in such a way that the rollers of the first group of rollers are predisposed and mounted on the carriage so as to be in contact with the internal rolling wall and the external rolling wall of the guide rail only at the straight portions, and not to be in contact with the two walls in the curved portions, while the rollers of the second group of rollers are predisposed and mounted on the carriage so as to be in contact with the internal rolling wall and the external rolling wall of the guide rail only at the curved portions, and not to be in contact with the two walls in the straight portions.

    [0015] The first group of rollers comprises at least an internal roller, and at least a pair of external rollers: the internal roller and the pair of external rollers are predisposed and mounted on the carriage in such a way that the internal roller is in contact with the internal wall of the guide rail only at a relative straight portion, while the pair of external rollers are predisposed on the carriage so that they are in contact with the external wall of the guide rail only at a relative straight portion.

    [0016] Therefore the internal roller and the pair of external rollers of the first group of rollers are contemporaneously in contact with the two walls of the guide rail along the straight portions while they are not in contact with the two walls when the carriage follows a curved portion of the guide rail.

    [0017] In turn, the second group of rollers comprises at least an internal roller, and at least a pair of external rollers: the internal roller and the pair of external rollers are predisposed and mounted on the carriage in such a way that the internal roller is in contact with the internal wall of the guide rail only at a relative curved portion, while the pair of external rollers are predisposed on the carriage so that they are in contact with the external wall of the guide rail only at a relative curved portion.

    [0018] Therefore the internal roller and the pair of external rollers of the second group of rollers are contemporaneously in contact with the two walls of the guide rail along the curved portions while they are not in contact with the two walls when the carriage follows a straight portion, of the guide rail.

    [0019] The internal rolling wall and the external rolling wall of the guide rail have a flat surface at the two straight portions of the guide rail while they have a curved surface having a truncoconical shape, i.e. they represent a portion of lateral surface of a corresponding cone which contains them, at the curved portions of the guide rail.

    [0020] The rollers of the first group of rollers are cylindrical, i.e. there is a linear contact between the lateral cylindrical wall thereof and the two walls, internal and external, of the guide rail along the relative straight portions.

    [0021] The rollers of the second group of rollers has, instead, a truncoconical shape, i.e. the lateral surface thereof is a portion of the lateral surface of a cone, so in this case too the contact between the truncoconical rollers of the second group of rollers and the internal and external walls of the curved portions of the guide rail always occurs along a linear portion.

    [0022] In the transport system described in document US2016/0031648 described above there are however some drawbacks.

    [0023] Firstly, problems can arise concerning the stability of the carriage at the change of direction of the carriage of the guide rail from the straight portion to the curved portion, as there is a moment of transition in which the rollers of the first group of rollers lose contact with the internal walls and the external walls of the guide rail in the final part of the straight portion, while the rollers of the second group of rollers must instead gain contact with the two walls at the start of the curved portion. The same drawback occurs during the change of direction of the guide rail from the curved portion to the straight portion.

    [0024] This can lead to an increase in stresses and strains on the rollers of the two groups, with the consequence that the reduction in the degree of wear is not as good as was hoped for.

    [0025] Further, the amplitude of the curved portion, defined by the radii of the cones that contain the truncoconical surfaces of the external and internal wall of the curved portion of the guide rail, must be quite large, with the aim of reducing friction, as all the rollers of the second group of rollers, both the internal roller and the pair of external rollers, have a truncoconical shape, and there is therefore a linear contact with both the walls, internal and external, of the curved portion of the guide rail.

    [0026] This leads to an overall volume of the transport system that is quite significant.

    [0027] Document JP2001171512 discloses a rail truck transport system according to another prior art solution.

    SUMMARY OF THE INVENTION



    [0028] The aim of the present invention is therefore to provide a new transport system for transporting products that is able to obviate the above-mentioned drawbacks present in the transport systems of known type.

    [0029] In particular, an aim of the present invention is to provide a new transport system so as to enable significantly reducing the degree of wear on the rollers while at the same time having an overall volume that is contained.

    [0030] The above-cited aims are attained with a transport system according to the contents of claim 1.

    [0031] Further characteristics and advantageous aspects of the transport system of the invention are set down in the various dependent claims.

    BRIEF DESCRIPTION OF THE DRAWINGS



    [0032] The characteristics of a preferred, but not exclusive, embodiment of the transport system of the present invention will be described in the following with reference to the appended tables of drawings, in which:
    • figure 1 illustrates a plan view of the transport system of the present invention;
    • figure 2 is a lateral view of the transport system of the invention, in which a partial transversal section has been carried out according to section plane II-II indicated in figure 1;
    • figure 3 is a view along section plane III-III of figure 1;
    • figure 4 is a front view of the transport system of the invention, in which a partial transversal section has been carried out according to section plane IV-IV indicated in figure 1;
    • figure 5 illustrates detail K of figure 2 in larger scale;
    • figure 6 is a view along section plane VI-VI of figure 1, in a larger scale;
    • figure 7 illustrates a partial perspective view of some significant elements of the transport system of the present invention;
    • figure 8 illustrates some components of the transport system of the present invention;
    • figure 9 is a schematic illustration of significant elements of the transport system of the present invention and the mutually geometric arrangement thereof, with reference to a transversal section carried out at a transversal plane to a curved portion of the looped pathway.

    DESCRIPTION OF THE PREFERRED EMBODIMENTS



    [0033] With reference to the accompanying tables of drawings, reference letter (S) denotes the transport system for transporting products of the present invention. The transport system (S) comprises a guide rail (1) having a looped pathway (visible in particular in figure 1) and comprising straight portions (R) and curved portions (C) for linking the straight portions (R).

    [0034] The guide rail (1) is conformed so as to have an internal rolling wall (11) and an external rolling wall (12), the internal rolling wall (11) and the external rolling wall (12) being conformed in such a way as to have a flat surface at the straight portions (R) and a curved surface at curved portions (C).

    [0035] For example, see figure 3 which illustrates the section according to section plane III-III of figure 1, made at a straight portion (R) of the guide rail (1): at the top on the right can be seen the internal wall (11) and the external wall (12) of the guide rail (1) having a flat surface, while on the top on the left of the same figure, the internal wall (11) having a curved surface at the curved portion (C) of the guide rail (1) can be observed.

    [0036] The transport system (S) further comprises:

    at least a carriage (2) for transport of at least a relative product that can be moved by movement means (not illustrated as of known type and not constituting part of the invention) along the guide rail (1) (for example hooking/support elements of known type can be associated to the carriage (2) for engaging and supporting a relative product);

    a first group (3) of rollers and a second group (4) of rollers predisposed and mounted on the carriage (2).



    [0037] The first group (3) of rollers comprises an internal roller (31) and a pair of external rollers (32), while the second group (4) of rollers comprising a pair of rollers (41) (see for example figure 8 where all the roller of the two groups of rollers are visible).

    [0038] The first group (3) of rollers is predisposed and mounted on the carriage (2) in such a way that the relative internal roller (31) is in contact with and rolls on the internal wall (11) of the guide rail (1) at the straight portions (R) and in such a way that the pair of external rollers (32) is in contact with and rolls on the external wall (32) of the guide rail (1) at the straight portions (R), so that the internal roller (31) and the pair of external rollers (32) are contemporaneously in contact with and roll on the internal wall (11) and external wall (12) of the guide rail (1) at the straight portions (R) when the carriage (2) is moved along the straight portions (R) (for example see figures 3 and 4 in this regard).

    [0039] The pair of rollers (41) of the second group (4) of rollers is instead predisposed and mounted on the carriage (2) so that the rollers (41) are distant from the guide rail (1) and so as not to be in contact with the guide rail (1) at the straight portions (R) of the guide rail (1) when the carriage (2) is moved along the straight portions (R) (see figure 2, with the central carriage at the top, figure 3, at the top on the right, and figure 4, at the top on the left).

    [0040] A first peculiarity of the transport system (S) of the invention consists in the fact that it comprises an auxiliary guide element (5) predisposed at each curved portion (C) of the guide rail (1) and which is conformed such as to have a progression corresponding to the progression of the curved portion (C) of the guide rail (1) and which has an external rolling wall (51) conformed so as to have a curved surface (510) having a truncoconical shape (see for example figure 1 and figure 7).

    [0041] Other special characteristics of the transport system (S) of the invention relate to the fact that:

    the pair of rollers (41) of the second group (4) of rollers have a truncoconical shape and are predisposed and mounted on the carriage (2) in such a way that, with the lateral truncoconical surface thereof, they contact and roll on the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5) when the carriage (2) is moved along the curved portion (C) of the guide rail (1) (see for example figures 7 and figures 5 and 6, which are views along section planes V-V and VI-VI of figure 1 drawn at different points of the curved portion (C) of the guide rail (1));

    the external wall (12) of the guide rail (1) is also conformed and predisposed so as to have, at each curved portion (C), of the guide rail (1), a curved surface (120) having a progression, with respect to the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5) so that there is play between the curved surface (120) and the pair of external rollers (32) of the first group (3) of rollers so that the external rollers (32) are no longer in contact with the guide rail (1) when the carriage (2) is moved along the curved portion of the guide rail (1) (see for example figures 5 and 7),

    the internal wall (11) of the guide rail (1) is conformed and predisposed so as to have, at each curved portion (C) of the guide rail (1), a curved arched surface (110) with a curvature facing towards the internal roller (31) of the first group (3) of rollers and with the internal roller (31) of the first group (3) of rollers which is predisposed and mounted on the carriage (2) so as to be in contact with and roll on the curved arched surface (110) of the internal wall (11) of the guide rail (1) at the curved portion (C) of the guide rail (1), when the carriage (2) is moved along the curved portion (C) of the guide rail (1), so that the internal roller (31) of the first group (3) of rollers (see in particular figures 5 and 6) is always in contact with the internal wall (11) of the guide rail (1) both at the straight portions (R) and at the curved portions (C).



    [0042] With these special features, when the carriage (2) is moved to pass from a straight portion (R) to a curved portion (C) of the guide rail (1), and from a curved portion (C) to a straight portion (R), the internal roller (31) of the first group of rollers (3), the transport system (S) is always and in any case in contact with and rolls on the internal wall (11) of the guide rail due to the special shape of the internal wall (11) which has an arched curved surface (120).

    [0043] In this way, the carriage (2) is kept stable during the loss of contact of the pair of external rollers (32) of the first group (3) of rollers with the external wall (12) of the guide rail (1) and the initial contact by the pair of rollers (41) of the second group of rollers (4) with the external rolling wall (51) of the auxiliary guide element (5).

    [0044] This circumstance, as well as guarantee stability of the carriage (2) during transit thereof from a curved portion to a straight portion, further enables reducing the stresses to which the rollers are subjected and therefore reduces the state of wear thereof.

    [0045] Further, the presence of the auxiliary guide element (5) facilitates the design of the carriage (2) and the arrangement thereon of the various rollers, as well as the changing operations of the contact between the pair of external rollers (32) of the first group (3) of rollers and the pair of rollers (42) of the second group (4) of rollers, as the pair of rollers (42) must not act and go into contact, when the carriage (2) is moved along the curved portion (C), with the external wall (12) of the guide rail (1) against which the pair of external rollers (32) of the first group (3) of rollers are in contact with and roll on when the carriage (2) is moved along a straight portion (R).

    [0046] Lastly, the circumstance that the external wall (12) of the guide rail (1) is specially designed and predisposed so as to have, at each curved portion (C), of the guide rail (1), a curved surface (120) having a progression, with respect to the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5) so that there is play between the curved surface (120) and the pair of external rollers (32) of the first group (3) of rollers, facilitates the exchange of contact between the pair of external rollers (32) of the first group (1) of rollers and the pair of rollers (41) of the second group (4) of rollers which go into contact with the external rolling wall (51) of the auxiliary guide element (5).

    [0047] In this way the stresses acting on the rollers are further reduced, with a consequent advantage in terms of reduction of wear thereon.

    [0048] Further advantageous aspects of the transport system (S) proposed by the present invention are described in the following.

    [0049] The truncoconical rollers (41) of the second group (4) of rollers are mounted and predisposed on the carriage (2) so that the relative rotation axes intersect in a point situated on the axis of a cone (C1) having a lateral surface that comprises a lateral truncoconical portion defined by the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5).

    [0050] The cones (C2) generated starting from the lateral truncoconical surface of the rollers (41) of the second group (4) of rollers have the relative vertices in common with one another and arranged at the vertex of the cone (C1) generated starting from the truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5).

    [0051] The external wall (12) of the guide rail (1) has, at the curved portions (C) of the guide rail (1), a curved surface (120) having a truncoconical shape, and the cone (C3) generated starting from the curved truncoconical surface (120) of the external wall (12) of the guide rail (1), an axis located at the cone axis (C1) generated starting from the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5); further, the cone (C3) generated starting from the curved truncoconical surface (120) of the external wall (12) of the guide rail (1) has, at each straight portion (C), an angle of aperture (α) identical to the angle of aperture (α) of the cone (C1) generated starting from the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5).

    [0052] The cone (C3) generated starting from the curved truncoconical surface (120) of the external wall (12) of the guide rail (1) has at each straight portion (C) a base radius that is smaller than the base radius of the cone (C1) generated starting from the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5).

    [0053] In this way, considering longitudinal section planes, the radius of the truncoconical surface of the external wall of the guide rail at the curved portions is smaller than the radius of the truncoconical surface of the external rolling wall of the auxiliary guide element, enabling obtaining the play between the pair of external rollers of the first group of rollers and the external wall of the guide rail in the curved portions of the guide rail.

    [0054] In this regard, see figure 9 which is a schematic illustration of the roller of the first group of rollers and the rollers of the second group, the guide rail and the auxiliary guide element, the reciprocal arrangement thereof and the relations existing between them as detailed in the foregoing.

    [0055] The internal roller (31) and the pair of external rollers (32) of the first group (3) of rollers have a cylindrical shape, i.e. they have a cylindrical lateral surface.

    [0056] This means that when the carriage (2) is moved along a curved portion (C) of the guide rail (1), there is a substantially punctual contact between the cylindrical lateral surface of the internal roller (31) of the first group (3) of rollers and the curved arched surface (110) of the internal wall (11) of the guide rail (1).

    [0057] This leads to a series of advantages.

    [0058] Firstly, the reduction of the degree of wear of the internal roller (31), secondly, since the contact between it and the internal wall (11) of the guide rail (1) in the curved portion is substantially punctual, the curvature of the curved portion can be quite tight, in the sense that the degree of curvature of the curved portion can be reduced and be smaller than the known-type transfer systems, where the contact between the rollers which act on the internal roller and the rollers that act on the external wall of the curved portion of the rail is always linear.

    [0059] There is a consequent significant reduction in the overall volume of the transport system.

    [0060] Further aspects of the transport system of the invention are the following.

    [0061] The internal roller (31) and the pair of external rollers (32) of the first group (3) of rollers are mounted and predisposed on the carriage (2) so that the rotation axis of the internal roller (31) is parallel to the flat surface of the internal wall (11) of the guide rail (1) at the straight portion (R) of the guide rail (1) and the rotation axes of the pair of external rollers (32) are parallel to one another and parallel to the flat surface of the external wall (12) of the guide rail (1) at the straight portion (R) of the guide rail (1).

    [0062] Further, the flat surface of the internal wall (11) and the flat surface of the external wall (12) of the guide rail (1), at the straight portions (R) of the guide rail (1), have the same inclination with respect to the axis of the guide rail (1).

    [0063] The guide rail (1) therefore has, at the straight portions (R), a transversal section having an isosceles triangular shape or an isosceles trapeze shape.

    [0064] The transport system (S) of the invention can further be designed and configured so as to have a second guide rail, conformed identically to the guide rail described in the foregoing, but arranged specularly to the guide rail, either above it or below it.

    [0065] For example, in the figures of the drawings, the second guide rail is arranged below the guide rail (1) described in the foregoing.

    [0066] Consequently, the transport system will also comprise further auxiliary guide elements arranged at the curved portions of the second guide rail, and further carriages also having a first group of rollers having an internal roller and a pair of external rollers, with the internal roller always being in contact with the internal wall of the second guide rail, both in the straight portions and curved portions, and with the pair of external rollers being in contact with the external wall of the guide rail only in the straight portions, and a second group of rollers comprises at least a pair of rollers predisposed not to be in contact with the guide rail but to go into contact with the external wall of the auxiliary guide elements when the relative carriage is moved along the straight portions of the second guide rail.

    [0067] In this case the transport system is designed and configured so that a carriage mounted on the second guide rail is connected via a relative bracket or another rigid element to a corresponding carriage mounted on the guide rail (1): in this way there will be a pair of carriages which will be moved along the relative guide rails, for transport of a relative product, ensuring a greater stability thereof.

    [0068] From the above it is clear that the transport system of the present invention effectively obviates the various drawbacks which are encountered in the transport systems of the prior art described in the preamble hereto.


    Claims

    1. A transport system (S) for transport of products, comprising:

    a guide rail (1) having a loop-wound pathway and comprising straight portions (R) and curved portions (C) for connecting the straight portions (R), the guide rail (1) being conformed so as to have an internal wall (11) and an external wall (12), the internal rolling wall (11) and the external rolling wall (12) being conformed in such a way as to have a flat surface at the straight portions (R) and a curved surface at curved portions (C);

    at least a carriage (2) for transport of at least a relative product that can be moved by movement means along the guide rail (1);

    a first group (3) of rollers and a second group (4) of rollers predisposed and mounted on the carriage (2);

    the first group (3) of rollers comprising an internal roller (31) and a pair of external rollers (32);

    the second group (4) of rollers comprising a pair of rollers (41);

    the first group (3) of rollers being predisposed and mounted on the carriage (2) in such a way that the relative internal roller (31) is in contact with and rolls on the internal wall (11) of the guide rail (1) at the straight portions (R) and in such a way that the pair of external rollers (32) is in contact with and rolls on the external wall (32) of the guide rail (1) at the straight portions (R), so that the internal roller (31) and the pair of external rollers (32) are contemporaneously in contact with and roll on the internal wall (11) and external wall (12) of the guide rail (1) at the straight portions (R) when the carriage (2) is moved along the straight portions (R),

    the pair of rollers (41) of the second group (4) of rollers being predisposed and mounted on the carriage (2) so that the rollers (41) are distant from the guide rail (1) and so as not to be in contact with the guide rail (1) at the straight portions (R) of the guide rail (1) when the carriage (2) is moved along the straight portions (R), the pair of rollers (41) of the second group (4) of rollers having a truncoconical shape;

    characterised in that it comprises:
    an auxiliary guide element (5) predisposed at each curved portion (C) of the guide rail (1) and conformed such as to have a progression corresponding to the progression of the curved portion (C) of the guide rail (1) and having an external rolling wall (51) conformed so as to have a curved surface (510) having a truncoconical shape, and in that:

    the pair of rollers (41) of the second group (4) of rollers are predisposed and mounted on the carriage (2) in such a way that, with the truncoconical lateral surface thereof, they contact and roll on the truncoconical curved surface (510) of the external rolling wall (51) of the auxiliary guide element (5) when the carriage (2) is moved along the curved portion (C) of the guide rail (1),

    the external wall (12) of the guide rail (1) is also conformed and predisposed so as to have, at each curved portion (C), of the guide rail (1), a curved surface (120) having a progression, with respect to the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5) so that there is play between the curved surface (120) and the pair of external rollers (32) of the first group (3) of rollers so that the external rollers (32) are no longer in contact with the guide rail (1) when the carriage (2) is moved along the curved portion of the guide rail (1),

    the internal wall (11) of the guide rail (1) is conformed and predisposed so as to have, at each curved portion (C) of the guide rail (1), a curved arched surface (110) with a curvature facing towards the internal roller (31) of the first group (3) of rollers and with the internal roller (31) of the first group (3) of rollers which is predisposed and mounted on the carriage (2) so as to be in contact with and roll on the curved arched surface (110) of the internal wall (11) of the guide rail (1) at the curved portion (C) of the guide rail (1), when the carriage (2) is moved along the curved portion (C) of the guide rail (1), so that the internal roller (31) of the first group (3) of rollers is always in contact with the internal wall (11) of the guide rail (1) both at the straight portions (R) and at the curved portions (C).


     
    2. The transport system of claim 1, characterised in that the rollers (41) having a truncoconical shape of the second group (4) of rollers are mounted and predisposed on the carriage (2) so that the relative rotation axes intersect in a point situated on the axis of a cone (C1) having a lateral surface that comprises a lateral truncoconical portion defined by the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5).
     
    3. The transport system of claim 2, characterised in that the cones (C2) generated starting from the lateral truncoconical surface of the rollers (41) of the second group (4) of rollers have the relative vertices in common with one another and arranged at the vertex of the cone (C1) generated starting from the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5).
     
    4. The transport system of claim 3, characterised in that the external wall (12) of the guide rail (1) has, at the curved portions (C) of the guide rail (1), a curved surface (120) having a truncoconical shape and in that the cone (C3) generated starting from the curved truncoconical surface (120) of the external wall (12) of the guide rail (1) has an axis thereof at the cone axis (C1) generated starting from the curved truncoconical surface (510) of the external rolling wall (51) of the auxiliary guide element (5) and an angle of aperture (α) equal to the angle of aperture (α) thereof.
     
    5. The transport system of any one of the preceding claims, characterised in that the internal roller (31) and the pair of external rollers (32) of the first group (3) of rollers are cylindrical and in that the internal roller (31) and the pair of external rollers (32) of the first group (3) of rollers are mounted and predisposed on the carriage (2) so that the rotation axis of the internal roller (31) is parallel to the flat surface of the internal wall (11) of the guide rail (1) at the straight portion (R) of the guide rail (1) and the rotation axes of the pair of external rollers (31) are parallel to one another and parallel to the flat surface of the external wall (12) of the guide rail (1) at the straight portion (R) of the guide rail (1).
     
    6. The transport system of the preceding claim, characterised in that the flat surface of the internal wall (11) and the flat surface of the external wall (12) of the guide rail (1), at the straight portions (R) of the guide rail (1), have the same inclination with respect to the axis of the guide rail (1).
     
    7. The transport system of the preceding claim, characterised in that the guide rail (1) has, at the straight portions (R), a transversal section having an isosceles triangular shape or an isosceles trapeze shape.
     


    Ansprüche

    1. Transportsystem (S) zum Transportieren von Produkten, umfassend:

    eine Führungsschiene (1), die einen schleifenförmig geschlossenen Verlauf aufweist und gerade Abschnitte (R) sowie kurvenförmige Abschnitte (C) zur Verbindung der geraden Abschnitte (R) umfasst, wobei die Führungsschiene (1) derart beschaffen ist, dass sie eine innere Wand (11) und eine äußere Wand (12) aufweist, wobei die innere Abrollwand (11) und die äußere Abrollwand (12) so beschaffen sind, dass sie eine flache Oberfläche an den geraden Abschnitten (R) und eine kurvenförmige Oberfläche an den kurvenförmigen Abschnitten (C) aufweisen;

    zumindest einen Wagen (2) zum Transportieren von zumindest einem entsprechenden Produkt, der durch Bewegungsmittel entlang der Führungsschiene (1) bewegt werden kann;

    eine erste Gruppe (3) von Rollen und eine zweite Gruppe (4) von Rollen, die auf dem Wagen (2) vorgesehen und montiert sind;

    wobei die erste Gruppe (3) von Rollen eine innere Rolle (31) und ein Paar äußerer Rollen (32) umfasst;

    wobei die zweite Gruppe (4) von Rollen ein Paar Rollen (41) umfasst; die erste Gruppe (3) von Rollen derart auf dem Wagen (2) vorgesehen und montiert ist, dass die entsprechende innere Rolle (31) in Berührung mit der inneren Wand (11) der Führungsschiene (1) an den geraden Abschnitten (R) ist und darauf rollt, und derart, dass das Paar äußerer Rollen (32) in Berührung mit der äußeren Wand (12) der Führungsschiene (1) an den geraden Abschnitten (R), ist und darauf rollt, so dass die innere Rolle (31) und das Paar äußerer Rollen (32) gleichzeitig in Berührung mit der inneren Wand (11) und der äußeren Wand (12) der Führungsschiene (1) an den geraden Abschnitten (R) sind und darauf rollen, wenn der Wagen (2) entlang den geraden Abschnitten (R) bewegt wird, wobei das Paar Rollen (41) der zweiten Gruppe (4) von Rollen derart auf dem Wagen (2) vorgesehen und montiert ist, dass die Rollen (41) von der Führungsschiene (1) beabstandet sind und nicht in Berührung mit der Führungsschiene (1) an den geraden Abschnitten (R) der Führungsschiene (1) sind, wenn der Wagen (2) entlang den geraden Abschnitten (R) bewegt wird, und das Paar Rollen (41) der zweiten Gruppe (4) von Rollen eine kegelstumpfförmige Form aufweist;

    dadurch gekennzeichnet, dass es Folgendes beinhaltet:
    ein zusätzliches Führungselement (5), das an jedem kurvenförmigen Abschnitt (C) der Führungsschiene (1) vorgesehen und derart beschaffen ist, dass es einen Verlauf aufweist, der dem Verlauf des kurvenförmigen Abschnitts (C) der Führungsschiene (1) entspricht, und eine äußere Abrollwand (51) aufweist, die so beschaffen ist, dass sie eine kurvenförmige Oberfläche (510) mit kegelstumpfartiger Form aufweist, und dadurch, dass:

    das Paar Rollen (41) der zweiten Gruppe (4) von Rollen derart auf dem Wagen (2) vorgesehen und montiert ist, dass sie mit ihrer kegelstumpfförmigen seitlichen Oberfläche die kegelstumpfförmige kurvenförmige Oberfläche (510) der äußeren Abrollwand (51) des zusätzlichen Führungselements (5) berühren und darauf rollen, wenn der Wagen (2) entlang dem kurvenförmigen Abschnitt (C) der Führungsschiene (1) bewegt wird,

    die äußere Wand (12) der Führungsschiene (1) auch derart beschaffen und vorgesehen ist, dass sie, an jedem kurvenförmigen Abschnitt (C) der Führungsschiene (1), eine kurvenförmige Oberfläche (120) mit einem Verlauf in Bezug auf die kurvenförmige kegelstumpfförmige Oberfläche (510) der äußeren Abrollwand (51) des zusätzlichen Führungselements (5) aufweisen, dass ein Spiel zwischen der kurvenförmigen Oberfläche (120) und dem Paar äußerer Rollen (32) der ersten Gruppe (3) von Rollen besteht, so dass die äußeren Rollen (32) nicht mehr in Berührung mit der Führungsschiene (1) sind, wenn der Wagen (2) entlang dem kurvenförmigen Abschnitt der Führungsschiene (1) bewegt wird,

    die innere Wand (11) der Führungsschiene (1) derart beschaffen und vorgesehen ist, dass sie, an jedem kurvenförmigen Abschnitt (C) der Führungsschiene (1), eine kurvenförmige gebogene Oberfläche (110) mit einer Krümmung aufweist, die der inneren Rolle (31) der ersten Gruppe (3) von Rollen zugewandt ist, und wobei die innere Rolle (31) der ersten Gruppe (3) von Rollen derart auf dem Wagen (2) vorgesehen und montiert ist, dass sie in Berührung mit der kurvenförmigen gebogenen Oberfläche (110) der inneren Wand (11) der Führungsschiene (1) an dem kurvenförmigen Abschnitt (C) der Führungsschiene (1) ist, wenn der Wagen (2) entlang dem kurvenförmigen Abschnitt (C) der Führungsschiene (1) bewegt wird, so dass die innere Rolle (31) der ersten Gruppe (3) von Rollen immer in Berührung mit der inneren Wand (11) der Führungsschiene (1) ist, sowohl an den geraden Abschnitten (R) als auch an den kurvenförmigen Abschnitten (C).


     
    2. Transportsystem nach Anspruch 1, dadurch gekennzeichnet, dass die Rollen (41) mit kegelstumpfartiger Form der zweiten Gruppe (4) von Rollen derart auf dem Wagen (2) montiert und vorgesehen sind, dass sich die entsprechenden Drehachsen in einem Punkt schneiden, der auf der Achse eines Kegels (C1) liegt, der eine seitliche Oberfläche aufweist, die einen seitlichen kegelstumpfförmigen Abschnitt umfasst, der durch die kurvenförmige kegelstumpfförmige Oberfläche (510) der äußeren Abrollwand (51) des zusätzlichen Führungselementes (5) definiert ist.
     
    3. Transportsystem nach Anspruch 2, dadurch gekennzeichnet, dass die ausgehend von der seitlichen kegelstumpfförmigen Oberfläche der Rollen (41) der zweiten Gruppe (4) von Rollen erzeugten Kegel (C2) ihre jeweilige Spitzen gemein haben und diese an der Spitze des Kegels (C1) angeordnet sind, der ausgehend von der kurvenförmigen kegelstumpfförmigen Oberfläche (510) der äußeren Abrollwand (51) des zusätzlichen Führungselementes (5) erzeugt wird.
     
    4. Transportsystem nach Anspruch 3, dadurch gekennzeichnet, dass die äußere Wand (12) der Führungsschiene (1), an den kurvenförmigen Abschnitten (C) der Führungsschiene (1), eine kurvenförmige Oberfläche (120) mit kegelstumpfartiger Form aufweist, und dadurch, dass der Kegel (C3), der ausgehend von der kurvenförmigen kegelstumpfförmigen Oberfläche (120) der äußeren Wand (12) der Führungsschiene (1) erzeugt wird, eine Achse aufweist, die auf der Achse des Kegels (C1) liegt, der ausgehend von der kurvenförmigen kegelstumpfförmigen Oberfläche (510) der äußeren Abrollwand (51) des zusätzlichen Führungselementes (5) liegt, und einen Öffnungswinkel (α), der gleich dessen Öffnungswinkel (α) ist.
     
    5. Transportsystem nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die innere Rolle (31) und das Paar äußerer Rollen (32) der ersten Gruppe (3) von Rollen zylinderförmig sind, und dadurch, dass die innere Rolle (31) und das Paar äußerer Rollen (32) der ersten Gruppe (3) von Rollen derart auf dem Wagen (2) montiert und vorgesehen sind, dass die Drehachse der inneren Rolle (31) parallel zu der flachen Oberfläche der inneren Wand (11) der Führungsschiene (1) an dem geraden Abschnitt (R) der Führungsschiene (1) ist und die Drehachsen des Paares äußerer Rollen (32) parallel zueinander und parallel zu der flachen Oberfläche der äußeren Wand (12) der Führungsschiene (1) an dem geraden Abschnitt (R) der Führungsschiene (1) sind.
     
    6. Transportsystem nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die flache Oberfläche der inneren Wand (11) und die flache Oberfläche der äußeren Wand (12) der Führungsschiene (1), an den geraden Abschnitten (R) der Führungsschiene (1), dieselbe Neigung relativ zu der Achse der Führungsschiene (1) aufweisen.
     
    7. Transportsystem nach dem vorhergehenden Anspruch, dadurch gekennzeichnet, dass die Führungsschiene (1), an den geraden Abschnitten (R), einen Querschnitt mit gleichschenkliger Dreieckform oder gleichschenkliger Trapezform aufweist.
     


    Revendications

    1. Un système de transport (S) pour le transport de produits, comprenant:

    un rail de guidage (1) ayant un parcours en boucle fermée et comprenant des portions rectilignes (R) et des portions courbes (C) de raccordement des portions rectilignes (R), le rail de guidage (1) étant conformé de manière à avoir une paroi intérieure (11) et une paroi extérieure (12), la paroi intérieure (11) de roulement et la paroi extérieure (12) de roulement étant conformées de manière à avoir une surface plate au niveau des portions rectilignes (R) et une surface incurvée au niveau des portions courbes (C) ;

    au moins un chariot (2) pour le transport d'au moins un produit correspondant qui peut être déplacé par des moyens de déplacement le long du rail de guidage (1) ;

    un premier groupe (3) de rouleaux et un deuxième groupe (4) de rouleaux prédisposés et montés sur le chariot (2) ;

    le premier groupe (3) de rouleaux comprenant un rouleau intérieur (31) et une paire de rouleaux extérieurs (32) ;

    le deuxième groupe (4) de rouleaux comprenant une paire de rouleaux (41) ;

    le premier groupe (3) de rouleaux étant prédisposé et monté sur le chariot (2) de manière à ce que le rouleau intérieur (31) correspondant soit en contact avec et roule sur la paroi intérieure (11) du rail de guidage (1) au niveau des portions rectilignes (R) et de manière à ce que la paire de rouleaux extérieurs (32) soit en contact avec et roule sur la paroi extérieure (12) du rail de guidage (1) au niveau des portions rectilignes (R), afin que le rouleau intérieur (31) et la paire de rouleaux extérieurs (32) soient simultanément en contact avec et roulent sur la paroi intérieure (11) et la paroi extérieure (12) du rail de guidage (1) au niveau des portions rectilignes (R) lorsque le chariot (2) est déplacé le long des portions rectilignes (R),

    la paire de rouleaux (41) du deuxième groupe (4) de rouleaux étant prédisposée et montée sur le chariot (2) de manière à ce que les rouleaux (41) soient distants du rail de guidage (1) et de manière à ne pas être en contact avec le rail de guidage (1) au niveau des portions rectilignes (R) du rail de guidage (1) lorsque le chariot (2) est déplacé le long des portions rectilignes (R), la paire de rouleaux (41) du deuxième groupe (4) de rouleaux ayant une forme tronco-conique ;

    caractérisé en ce qu'il comprend :
    un élément de guidage auxiliaire (5) prédisposé au niveau de chaque portion courbe (C) du rail de guidage (1) et conformé de manière à avoir une progression correspondant à la progression de la portion courbe (C) du rail de guidage (1) et ayant une paroi extérieure de roulement (51) conformée de manière à avoir une surface incurvée (510) ayant une forme tronco-conique, et en ce que :

    les rouleaux de la paire de rouleaux (41) du deuxième groupe (4) de rouleaux sont prédisposés et montés sur le chariot (2) de manière à ce que, avec leur surface latérale tronco-conique, ils soient en contact avec et roulent sur la surface incurvée tronco-conique (510) de la paroi extérieure de roulement (51) de l'élément de guidage auxiliaire (5) lorsque le chariot (2) est déplacé le long de la portion courbe (C) du rail de guidage (1),

    la paroi extérieure (12) du rail de guidage (1) est également conformée et prédisposée de manière à avoir, au niveau de chaque portion courbe (C), du rail de guidage (1), une surface incurvée (120) ayant une progression telle, par rapport à la surface incurvée tronco-conique (510) de la paroi extérieure de roulement (51) de l'élément de guidage auxiliaire (5), qu'il y a un jeu entre la surface incurvée (120) et la paire de rouleaux extérieurs (32) du premier groupe (3) de rouleaux de sorte que les rouleaux extérieurs (32) ne sont plus en contact avec le rail de guidage (1) lorsque le chariot (2) est déplacé le long de la portion courbe du rail de guidage (1),

    la paroi intérieure (11) du rail de guidage (1) est conformée et prédisposée de manière à avoir, au niveau de chaque portion courbe (C) du rail de guidage (1), une surface arquée incurvée (110) avec une courbure orientée vers le rouleau intérieur (31) du premier groupe (3) de rouleaux et avec le rouleau intérieur (31) du premier groupe (3) de rouleaux qui est prédisposé et monté sur le chariot (2) de manière à être en contact avec et à rouler sur la surface arquée incurvée (110) de la paroi intérieure (11) du rail de guidage (1) au niveau de la portion courbe (C) du rail de guidage (1), lorsque le chariot (2) est déplacé le long de la portion courbe (C) du rail de guidage (1), de sorte que le rouleau intérieur (31) du premier groupe (3) de rouleaux est toujours en contact avec la paroi intérieure (11) du rail de guidage (1) à la fois au niveau des portions rectilignes (R) et au niveau des portions courbes (C).


     
    2. Le système de transport selon la revendication 1, caractérisé en ce que les rouleaux (41) ayant une forme tronco-conique du deuxième groupe (4) de rouleaux sont montés et prédisposés sur le chariot (2) de manière à ce que les axes de rotation correspondants se coupent en un point situé sur l'axe d'un cône (C1) ayant une surface latérale qui comprend une portion latérale tronco-conique définie par la surface incurvée tronco-conique (510) de la paroi extérieure de roulement (51) de l'élément de guidage auxiliaire (5).
     
    3. Le système de transport selon la revendication 2, caractérisé en ce que les cônes (C2) générés à partir de la surface latérale tronco-conique des rouleaux (41) du deuxième groupe (4) de rouleaux ont les sommets correspondants en commun entre eux et disposés au niveau du sommet du cône (C1) généré à partir de la surface incurvée tronco-conique (510) de la paroi extérieure de roulement (51) de l'élément de guidage auxiliaire (5).
     
    4. Le système de transport selon la revendication 3, caractérisé en ce que la paroi extérieure (12) du rail de guidage (1) a, au niveau des portions courbes (C) du rail de guidage (1), une surface incurvée (120) ayant une forme tronco-conique et en ce que le cône (C3) généré à partir de la surface incurvée tronco-conique (120) de la paroi extérieure (12) du rail de guidage (1) a un axe respectif au niveau de l'axe du cône (C1) généré à partir de la surface incurvée tronco-conique (510) de la paroi extérieure de roulement (51) de l'élément de guidage auxiliaire (5) et un angle d'ouverture (α) égal à l'angle d'ouverture (α) de celui-ci.
     
    5. Le système de transport selon l'une quelconque des revendications précédentes, caractérisé en ce que le rouleau intérieur (31) et la paire de rouleaux extérieurs (32) du premier groupe (3) de rouleaux sont cylindriques et en ce que le rouleau intérieur (31) et la paire de rouleaux extérieurs (32) du premier groupe (3) de rouleaux sont montés et prédisposés sur le chariot (2) de manière à ce que l'axe de rotation du rouleau intérieur (31) soit parallèle à la surface plate de la paroi intérieure (11) du rail de guidage (1) au niveau de la portion rectiligne (R) du rail de guidage (1) et que les axes de rotation de la paire de rouleaux extérieurs (32) soient parallèles entre eux et parallèles à la surface plate de la paroi extérieure (12) du rail de guidage (1) au niveau de la portion rectiligne (R) du rail de guidage (1).
     
    6. Le système de transport selon la revendication précédente, caractérisé en ce que la surface plate de la paroi intérieure (11) et la surface plate de la paroi extérieure (12) du rail de guidage (1), au niveau des portions rectilignes (R) du rail de guidage (1), ont la même inclinaison par rapport à l'axe du rail de guidage (1).
     
    7. Le système de transport selon la revendication précédente, caractérisé en ce que le rail de guidage (1) a, au niveau des portions rectilignes (R), une section transversale ayant la forme d'un triangle isocèle ou la forme d'un trapèze isocèle.
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description