FR3073810B1 - METHOD AND STATION FOR AUTOMATED LOADING OF ROOF TRAVERS ON A BOX FRAME OF A MOTOR VEHICLE - Google Patents

Abstract

The invention relates to a method of automatically depositing roof sleepers (4a-4c) on a body frame (1a-1c) at a loading station (3) comprising a single station (7) for laying the sleepers ( 4a-4c). The removal station (7) comprises a single store (8) for storing sleepers (4a-4c) and a single manipulator (11) for gripping sleepers (4a-4c), the implementation of which is placed under the control of control means (5). A first step is a step of collective gripping by the manipulator (11) of a set of crosspieces (4a-4c) stored in the storage magazine (8) and comprising a front cross member (4a), a crossbeam (4b) and a rear crossmember (4c). A second step is a step of successive deposition by the manipulator (11) of each of the crosspieces (4a-4c) previously entered, comprising operations of depositing at least two of the three crosspieces (4a-4c) on the reinforcement of body (1a-1c), including at least the rear crossmember (4c) and the front crossmember (4a), under control of the control means (5) according to the configuration of the body frame (1a-1c) to produce previously identified.

Description

METHOD AND STATION FOR AUTOMATED LOADING OF ROOF TRAVERS ON A BOX FRAME OF A MOTOR VEHICLE.

The present invention relates to the field of motor vehicles and more particularly to the automation of the operations of fitting on a assembly line of the components of a body frame of a motor vehicle. The invention relates more particularly to the automation of the removal operations of roof rails on such a body frame.

Motor vehicles comprise a body frame dressed with body elements and arranged to form a rolling structure. The body frame provides a robust structure for the vehicle, which is then installed various equipment, including to provide the propulsion of the vehicle and / or to provide comfort to passengers. The body frame comprises various components which are assembled together in different successive workstations of an assembly line. Among its components, the body frame comprises a roof frame which is essentially composed of longitudinal members and cross members and which is configured to receive at least one panel forming a roof plate of the vehicle. The spars extend from front to back and the cross members extend between the lateral sides of the body frame. The spars and cross members are commonly arranged in arches, the longitudinal members then forming longitudinal roof arches and the cross members then forming transverse roof arches.

The pavilion may be formed of a solid panel fixedly installed on the body frame via the roof frame. The roof frame then typically comprises a set of three crosspieces including a front cross member, a median cross member and a rear cross member, as can be seen for example from document 2 921 038 (PEUGEOT CITROEN AUTOMOBILES SA).

The pavilion is also likely to include at least one panel which is provided with a glazing unit and / or which is movably mounted on the roof frame between an open position and a closed position. In this case, the roof frame typically comprises a set of two front and rear cross members between which is installed a support frame of the panel, as is apparent for example from document 3 047 221 (PEUGEOT CITROEN AUTOMOBILES SA).

The spars and cross members of the roof frame are mounted on the body frame by being fixed to the top of amounts distributed longitudinally to the lateral sides of the body frame. A phase of removal of the components of the roof frame on the amounts is then performed on the assembly line of the body frame, prior to their attachment to each other and / or with reinforcing elements or dressing.

In this context, the assembly line of the body frame comprises a plurality of work stations arranged along a step-by-step routing line of box frames to be produced successively. Essentially, the assembly line of the body frame comprises successively a loading station of the body sides and / or a rear panel, a loading station sleepers, and a station for conforming the body, especially by providing a dressing.

The loading station of the sleepers conventionally includes stations for removing the sleepers on the body frame. The various removal stations comprise a manipulator and a tie storage magazine of a given type, that is to say cross-type cross-type front, middle cross type or rear cross type. Such a segmentation of the different removal stations facilitates the management of the deposit order of the sleepers on the body frame. The deposit of the sleepers on the body frame is controlled by a control means regulating the implementation of the manipulators in a pre-established deposit order.

Thus, the body frame is moved by the routing line successively to the dispensing stations. A manipulator grabs a cross member at the storage depot assigned to it, then moves it to drop it at its intended location on the body frame. The operation is repeated at each of the removal stations according to the order of deposit of the previously established sleepers.

In this context and on the basis of the finding that has just been made, the present invention is more specifically in a search for a procedure for automating the operations of removal of the sleepers on the body frame at the station of loading sleepers.

Thus the invention relates to an automated method of depositing on a body frame of a motor vehicle, sleepers that includes a participating roof frame of the body frame. The invention also relates to a loading station sleepers on the body frame that includes a assembly line components of the body frame.

An object of the invention is to limit the footprint of the loading station sleepers on the body frame. It is finally sought to reduce the overall footprint of the assembly line comprising said loading station.

Another object of the invention is to arrange the loading station sleepers, so as to obtain sustained production rates of the bed frames successively moved along the assembly line.

Another object of the invention is to simplify the organization of the loading station sleepers, in particular to limit its structural costs, its development costs inside a building housing the assembly line, and / or its implementation costs.

Another object of the invention is to allow selective removal of the sleepers on the body frames, taking into account a potential diversification of roof frame architectures between the body frames successively displaced along the assembly line .

Such a variety of architectures of the roof frames includes roof frames comprising three cross members for receiving a fixed roof panel, or roof frames comprising two cross members for receiving a support frame of at least a glazed roof panel and / or at least one movable roof panel between an open and closed position.

It is particularly targeted by the invention a reduction of the production costs of the vehicle in the context of a notoriously severe economic competition in the automotive field. Such a reduction in costs is particularly sought: -) by increasing the production rates of the body frames, -) by reducing the bulk of the loading station or in other words by optimizing the exploitation of a surface that is sought after. as modest as possible and which is reserved for the installation of the loading station inside a building housing the assembly line, -) by simplifying the arrangement and / or the organization of the loading station, as well as the modalities of its installation along the routing line of the body frames, and / or -) by optimizing the profitability of the loading station by making it versatile, in particular from a faculty of the station. loading to deposit selectively sleepers on the body frames according architectures roof frames that can be diversified.

The aims of the present invention are achieved in isolation or in combination by applying the following provisions.

The method of the invention is a method of automatically depositing roof rails on a body frame at a participating loading station of an assembly line. The loading station is arranged along a step-by-step routing line of case frames to be produced successively.

The loading station comprises at least one station for removing at least one cross member on the body frame. Said at least one dispensing station comprises at least one storage magazine of at least one cross member and at least one manipulator for gripping said at least one cross member. The implementation of the manipulator is placed under the control of a control means causing in a first step an input of said at least one cross member by the manipulator and in a second step a removal of said at least one cross member on the frame checkout.

According to the invention, said first step is a collective gripping step by a single manipulator of three sleepers of a set of sleepers stored in a single packet storage store of said set of three sleepers. Each set of cross members includes a front cross member, a median cross member and a rear cross member.

Said second step is a step of successive deposits by the manipulator of each of the previously entered sleepers. The second step comprises operations for removing at least two of the three sleepers on the body frame, including at least the rear cross member and the front cross member, under control of the control means according to the configuration of the frame of box to produce previously identified.

For if need be precise, the notion crosses as well as the notions back, median and before qualifying the sleepers, are relative notions typically identified with regard to the longitudinal extension of the vehicle from front to back. The identification of the individual configuration of the body plates successively displaced along the assembly line is for example conventionally carried out from an exchange of information between the control means and a means of individual identification of the reinforcements of the body. crate to be produced successively. Such identification can be performed at the beginning of routing of the body frame by the assembly line and / or input of a workstation that includes.

According to one embodiment, the second step more specifically comprises: -) successive removal operations by the manipulator at least the front cross member and the rear cross member on the body frame, and -) a deposit operation of the median cross by the manipulator selectively according to the configuration of the body frame to produce previously identified. The deposition operation of the median crosspiece is then: -) either a removal operation of the median cross member on the body frame, which is preferably carried out between the removal operations of the front cross member and the rear cross member, -) is a deposition operation of the median cross in a recovery tank, which is preferably performed before, or after, the removal operations of the rear cross member and the front cross member on the body frame.

According to one embodiment, the method comprises a loading operation of the packet store of said sets of sleepers. The crosspieces of each of the packets are arranged adjacent to the storage magazine in their main extension direction, in a storage order successively of the median cross, the rear cross member and the front cross member. In addition, the first step is a step of collective gripping of the sleepers by the manipulator according to said storage order.

According to one embodiment, at the end of the first step and in the direction of collective capture of the sleepers of a said set of sleepers by the manipulator at the storage magazine, the sleepers are carried by the manipulator in a stacking order . In this order of superposition, the rear crossmember is disposed at an upper overhanging plane of the middle cross member and the front cross member, and the middle cross member is disposed at a median overhang plane of the front cross member which is disposed at a lower plane. . The invention also relates to a loading station roof sleepers on a body frame adapted to implement a method according to the invention. According to the invention, the loading station comprises a said dispensing station which is unique and which comprises: -) a single said sleeper bundle storage magazine, each comprising three sleepers including a rear crossmember, a crossbeam and a front crossbar, and -) a single manipulator collective capture of the sleepers of a said set of sleepers and successive individual deposits of sleepers at said single removal station.

According to one embodiment and for each of said bundle bundles, the storage magazine comprises individual supports of the sleepers in respective predefined positions relative to each other. Said supports are each provided with at least positioning members of the sleepers which are assigned to them.

According to one embodiment, the manipulator is equipped with a collective gripping head of the sleepers of a said set of sleepers. The gripping head comprises individual gripping heads of the crosspieces in respective predefined positions relative to each other, in correlation with the respective positions at least adjacent to the sleepers in the storage magazine.

According to one embodiment, the gripping head is provided with a connecting member to the manipulator in a direction of assembly together, including an elevational direction. The gripping head is also provided with a support beam adjacent to gripping heads, the beam being oriented perpendicular to said assembly direction and perpendicular to a main direction of extension of the gripping heads oriented in the direction of main extension of the sleepers assigned to them. In other words, the assembly direction between the gripping head and the manipulator, the orientation of the beam and the direction of extension of the gripping heads parallel to each other, are perpendicular to each other in an orthonormal frame.

The gripping head is preferably arranged in a stepped structure comprising successively the connecting member, the beam carried by the connecting member, and the set of gripping heads individually mounted on the beam parallel to each other. According to one variant, the gripping head is arranged in a stepped structure comprising successively the joining member, the beam carried by the joining member, and the set of gripping heads carried by the beam parallel to each other, at least one of the gripping heads being carried by at least one of the other gripping heads. In other words, according to this variant, at least one of the gripping heads is carrying another gripping head interposed in adjacency between the two other gripping heads, via at least one arm connecting them to each other.

According to one embodiment, said beam forms a support of a control element of the individual implementation of each of the input heads. The implementation of the control element is placed under the control of the control means. The beam is preferably hollowed out by housing means for transmitting energy, electrical, pneumatic and / or hydraulic, interconnecting the control element and organs equipping the gripping heads, such as for example at least one clamping member and / or at least one presence detector of the sleepers on the gripping head.

Preferably, each of the gripping heads is equipped with: -) at least one positioning member on the gripping head of the crossbar which is assigned to it, -) at least one clamping member of said cross member which is affected, -) of at least one support member of said crossbar which is assigned to it against the gripping head, and -) at least one presence detector on the gripping head of said cross member which is assigned to it.

Exemplary embodiments of a loading station and / or its components in accordance with the present invention will be described in relation to the figures of the attached plates, in which: FIG. 1 is a schematic illustration of a station of loading sleepers on a body frame of a motor vehicle according to an embodiment of the invention, which is arranged along a line of stepwise routing of a series of body frames to produce. FIG. 2 is a partial schematic side view of an exemplary embodiment of a tie storage magazine configured to equip the loading station shown in FIG. 1; FIG. 3 and FIG. schematic illustrations respectively in side view and in bottom view, of an embodiment of a crosshead gripper configured to equip a single manipulator that includes the loading station shown in Figure 1, -) Figure 5 and FIG. 6 are partial illustrations in perspective of an exemplary embodiment of a stowage storage magazine configured to equip the loading station shown in FIG. 1, respectively shown in a vacuum and shown to be loaded with a set of sleepers. . FIG. 7 and FIG. 8 are partial perspective illustrations according to respective points of view, of an exemplary embodiment of a crosshead gripper configured to equip a single manipulator which comprises the loading station shown on FIG. FIG. 1, -) FIG. 9 and FIG. 10 are partial illustrations in perspective of the gripping head represented in FIGS. 7 and 8, in a gripping situation of the sleepers previously gripped at the storage magazine shown in FIGS. 6. -) Figures 11 to 16 are perspective views illustrating an example of implementation of a method according to the invention.

The figures and their detailed descriptions expose the invention in particular ways which are not restrictive as to the scope of the invention as defined by the claims. The figures and their detailed descriptions can serve to better define the invention, if necessary in relation to the general description which has just been made.

In Figure 1, an assembly line is organized to produce body frames 1a, 1b, 1c for motor vehicles. The assembly line comprises a step-by-step routing line 2 of the body frames 1a-1c to various workstations installed successively along the routing line 2. The body frames 1a-1c are thus displaced. stepwise along a direction S1 of advancement to the work stations, to gradually assemble the components of the box frames 1a-1c at each step of advancement.

Among said workstations, the assembly line comprises a loading station 3 of sleepers 4a, 4b, 4c on the body frames 1a-1c. The sleepers 4a-4c are assembled selectively on the box frames 4a-4c via uprights and / or side members previously mounted on the body frames 1a-1c, such as for example the uprights 22a or the beams 22b which are visible in Figures 11, 13, 14 and 15. The cross members 4a-4b are constituted by a roof frame of the body frames 1a-1c which is provided to later receive at least one panel forming a roof pavilion.

The assembly line comprises at least one control means 5 for regulating the various automata to be used to form the body frames 1a-1c according to their own arrangement. The control means 5 is equipped with a memory 6a for individual identification of the lay box frames according to their architecture. Such identification is notably carried out by exchanging information between an identification member 6b of the body plates 1a-1c and the control means 5.

In the context of the invention, the differentiation between the architectures of the body frames 1a-1c relates to the number and type of cross members 4a-4c to be respectively installed on the body frames 1a-1c, according to the configuration of the frames of roof they include respectively.

In particular according to a first architecture of body frames 1b to be produced, their roof frame comprises a set of three cross members 4a-4c for receiving a fixed roof roof panel, including a front cross member 4a, a crossmember 4b and a cross member rear 4c. According to a second frame reinforcement architecture 1c to be produced, their roof frame comprises a set of two crosspieces for receiving a frame for installing a glazed and / or movable roof cap between an open and closed position. , including a front cross member 4a and a rear cross member 4c.

The loading station comprises a single station 7 removal of the cross members 4a-4c on the body frames 1a-1c to be produced, which are successively presented by the routing line 2 to the loading station 3. The dispensing station 7 comprises a single store 8 for storing crosspieces 4a-4c, on which are successively installed in bundles 10 sets of three cross members respectively before 4a, median 4b and rear 4c. The sleepers 4a-4c are loaded adjacent to the storage magazine 8 by an operator, which has storage bins 9a-9c respective front cross members 4a, median 4b and rear 4c.

The storage magazine 8 is thus loaded into successive packets 10 of said sets of sleepers before 4a, median 4b and rear 4c by the operator, human or automaton. The storage magazine 8 then successively conveys the packs 10 of sets of crosspieces 4a-4c to a single manipulator 11 equipping the dispensing station 7.

The manipulator 11 collectively collects the cross members 4a-4c of a package 10 at the storage magazine 8. For this purpose, the manipulator 11 is equipped with a gripping head 12 which is arranged to collectively grasp the three crosspieces 4a-4c of the same set of cross members before 4a, median 4b and rear 4c. The manipulator 11 then deposits on the body frame 1a present at the loading station 3 at least the front crosspieces 4a and rear 4c, or even the crossbeam 4b according to the architecture of the body frame 1a to produce.

More particularly, the removal of the crosspieces 4a-4c by the manipulator 11 is performed selectively according to the architecture of the body frame 1b-1c to produce, under control of the control means 5. In the case where the architecture of the 1c body frame to be produced is of the type provided with a roof frame comprising only a front cross member 4a and a rear cross member 4c, the manipulator 11 deposits the crossbeam 4b in a recovery tank 13. The deposit by the manipulator 11 of the median crossbar 4b in the recovery tank 13 is preferably carried out prior to the installation of the front cross member 4a and the rear cross member 4c on the body frame 1a.

More particularly in Figures 2, 5 and 6, the sleepers of the same set of sleepers 4a-4c are installed on individual supports 14a-14c which equip the storage magazine 8. The supports 14a-14c are each provided with positioning members 15 of the crosspieces 4a-4c which are assigned to them and which are for example arranged in cleats and / or positioning pilots of the cross members 4a-4c resting on the supports 14a-14c. .

The crosspieces 4a-4c of each of the packets 10 are installed at rest on the supports 14a-14c which are assigned to them, being positioned on the supports 14a-14c via the positioning members 15 in their main extension direction D1 and following their direction D2 transverse which is oriented perpendicular to their direction D1 main extension.

The cross members 4a-4c of the same package 10 are installed on the storage magazine 8 on the supports 14a-14c which are assigned to them, according to a predefined storage order. Each bundle 10 of sleepers of the same set of crosspieces 4a-4b is conveyed by the storage magazine 8 to the manipulator 11 in accordance with this storage order, which is successively defined by the median crossbar 4b, the rear crossmember 4c and the front crossbar 4a.

More particularly still in FIGS. 3 and 4, and in FIGS. 7 and 8, the gripping head 12 of the manipulator 11 collectively grasps the crosspieces of a set of crosspieces 4a-4c presented in the storage magazine 8 according to their order of storage. . As a result, the sleepers of the same set of sleepers 4a-4c are carried by the gripping head 12 according to their order of storage on the storage magazine 8.

In addition, the sleepers of the same set of sleepers 4a-4c are carried by the gripping head 12 in a predefined superposition order. According to the gripping direction S2 of the crosspieces 4a-4c by the gripping head 12, said superposition order is defined by individual planes P1, P2, P3 supporting the crosspieces 4a-4c by the gripping head 12.

According to said superposition order, the rear cross member 4c is disposed at an upper plane P1 overhanging the median crossbeam 4b and the front cross member 4a. The median cross member 4b is disposed at a median plane P2 overhanging the front cross member 4a which is in turn arranged at a lower plane P3.

Said order of storage and / or said order of superposition are defined so that any crossbar 4a-4c does not prevent the installation of the other cross members 4a-4c on the body frame 1a-1c by the manipulator 11, and this regardless of the architecture of the body frame 1a-1c to produce.

The gripping head 12 comprises a connecting member 16 to the manipulator 11 which carries a beam 17, itself carrying three gripping heads 18a, 18b, 18c which are adjacent in their main direction D3 extension. Each of the gripping heads 18a-18c is assigned to grip a single cross member of a set of crosspieces 4a-4c, extending mainly in a direction D3 perpendicular to the beam 17 and parallel to the main direction D1 d extension of sleepers 4a-4c.

The beam 17 also forms a support for a control element 19 whose implementation is placed under the control of the control means 5. The controller 19 regulates the individual implementation of each of the heads of grasping 18a-18c, in particular during the seizure and / or removal of crosspieces 4a-4c by the manipulator 11 on the body frame 1b or in the tray 13 of recovery with respect to the median crossbar 4b for a body armature 1c structure free of center transom 4b.

In Figures 3 and 4 and in Figures 7 and 8, each of the gripping heads 18a-18c is provided with holding members 20a-20c of the crossbar 4a-4c assigned to it. Such holding members comprise in particular positioning members 20a arranged for example in cleats, support members 20b configured as support fingers and / or cleats for example, and at least one clamping member 20c, for example configured as a clamp. The holding members 20a-20c are mounted on the gripping heads 18a-18c via branches 21 which equip the beams 21a, 21b, 21c for mounting the gripping heads 18a-18c on the beam 17, and / or which are directly mounted on the beam 17.

The implementation of the clamping member 20c is placed under the control device 19. At least one presence sensor 20d, fitted for example with the clamping member 20c, makes it possible to transmit to the control-control member 19 information relating to the presence or absence of a cross member 4a-4c on the gripping head 18a-18c assigned to it.

In FIGS. 11 to 16, the gripping head 12 is approaching the body frame 1a present at the loading station 3. According to the illustrated example, the body frame 1a is intended to receive the three sleepers 4a. 4c in accordance with its prior identification by the control means 5.

According to the exemplary embodiment of the method of the invention illustrated, a first removal operation of the front cross member 4a on the body frame 1a is performed by the manipulator 11 as illustrated in FIG. 11 and in more detail on the FIG. 12. The manipulator 11 then deposits the median crosspiece 4b on the body frame 1a during a second removal operation, as illustrated in FIG. 13 and in more detail in FIG. 14. Then during a third operation of removal, the manipulator 11 finally deposits the rear cross member 4c on the body frame 1a during a third removal operation, as shown in Figure 15 and in more detail in Figure 16. The direction S3 of depositing 4a-4c sleepers on the body frame 1a by the manipulator 11, is oriented in the direction S2 gripping 4a-4c sleepers by the manipulator 11 storage 8.

It is understood that in the case where the body frame 1c is intended to receive only a front cross member 4a and a rear cross member 4c for the formation of a glazed roof and / or mobile, the second depositing operation is substituted by a deposition operation of the median crossbeam 4b in the recovery tank 13 prior to the removal of the front cross members 4a and 4c rear on the body frame 1c.

It will also be noted more particularly in the detail views of FIGS. 12, 14 and 16, that the operations of individual removal of the crosspieces 4a-4c on the body frame 1a are carried out while avoiding any discomfort that may be induced by the presence initial of the set of sleepers 4a-4c of the game on the gripping head 12. Such discomfort is avoided especially due to the order of storage and / or the order of superposition of sleepers 4a-4c initially provided during from their collective grip by the gripping head 12 on the storage magazine 8.

Claims (10)

1A method of automatically removing roof rails (4a-4c) on a body frame (1a-1c) at a loading station (3) participating in an assembly line and arranged along a line of routing (2) stepwise of reinforcement plates (1a-1c) to be produced successively, the loading station (3) comprising at least one removal station (7) of at least one crossbar (4a-4c) on the body frame (1a-1c), said at least one removal station (7) comprising at least one magazine (8) for storing at least one cross member (4a-4c) and at least one manipulator (11) gripping said at least one cross member (4a-4c) whose implementation is placed under the control of a control means (5) causing in a first step an input of said at least one cross (4a-4c) by the manipulator (11) and in a second step a removal of said at least one cross member (4a-4c) on the body frame (1a-1c), characterized in that: -) in that said first step is a step of collective capture by a single manipulator (11) of three sleepers of a set of sleepers (4a-4c) stored in a single store (8) of packet storage (10) of said set of three sleepers (4a-4c), each set of sleepers (4a-4c) comprising a front cross member (4a), a middle cross member (4b) and a rear cross member (4c), and -) in that said second step is a step of successive deposits by the manipulator (11) of each of the crosspieces (4a-4c) previously entered, comprising operations for removing at least two of the three sleepers (4a-4c) on the body frame (1 a-1 c ), including at least the rear cross member (4c) and the front cross member (4a), under control of the control means (5) according to the configuration of the body frame (1a-1c) to produce previously identified. 2, - Method according to claim 1, characterized in that the second step comprises: -) successive removal operations by the manipulator (11) at least the front cross member (4a) and the rear cross member (4c) on the body reinforcement (1 a-1 c), and -) a depositing operation of the median crosspiece (4b) by the manipulator (11) selectively according to the configuration of the body frame (1a-1c) to produce previously identified, either on the body frame (1a, 1b) being performed between the removal operations of the front cross member (4a) and the rear cross member (4c), or in a tray (13) for recovery in being performed before the removal operations of the rear cross member (4c) and the front cross member (4a) on the body frame (1a, 1b). 3, - Method according to any one of claims 1 and 2, characterized: -) in that it comprises a loading operation of the store (8) packets (10) of said sets of sleepers (4a-4c), the crosspieces (4a-4c) of each of the packets (10) being arranged adjacent to the storage magazine (8) along their main extension direction (D1) in a storage order successively of the median crosspiece (4b), the rear cross member (4c) and the front cross member (4a), and -) in that the first step is a step of collective capture of the crosspieces (4a-4c) by the manipulator (11) following said storage order. 4, - A method according to any one of claims 1 to 3, characterized in that at the end of the first step and in the direction (S2) collective capture of the sleepers of a said set of sleepers (4a 4c) by the manipulator (11) at the storage magazine (8), the crosspieces (4a-4c) are carried by the manipulator (11) in a superposition order according to which the rear crossmember (4c) is arranged in a plane ( P1) above the median cross member (4b) and the front cross member (4a), and wherein the median cross member (4b) is disposed at a median plane (P2) overhanging the front cross member (4a) which is disposed at a lower plane (P3). 5, - Loading station roof sleepers (4a-4c) on a body frame (1a-1c) adapted to implement a method according to any one of claims 1 to 4, characterized in that it includes a said removal station (7) which is unique and which comprises: -) a single said storage magazine (8) for bundles (10) of sets of sleepers (4a-4c) each comprising three sleepers, one of which crosses rear (4c), a median crossbeam (4b) and a front crossbar (4a), and -) a single manipulator (11) collective gripping of the sleepers of a said set of sleepers (4a-4c) and successive individual deposits crosspieces (4a-4c) at said single removal station (7). 6, - Loading station according to claim 5, characterized in that for each of the packs (10) of said sets of sleepers (4a-4c), the store (8) storage comprises supports (14a-14c) individual of crosspieces (4a-4c) in respective predefined positions relative to each other, said supports (14a-14c) being each provided with at least positioning members (15) cross members (4a-4c) assigned to them. 7, - Loading station according to any one of claims 5 and 6, characterized in that the manipulator (11) is equipped with a gripping head (12) collective sleepers of a said set of sleepers (4a). 4c), the gripping head (12) comprising individual gripping heads (18a-18c) of the crosspieces (4a-4c) in respective predefined positions relative to each other in correlation with the respective positions at least in adjacent sleepers (4a-4c) in the warehouse (8). 8, - Loading station according to claim 7, characterized in that the gripping head (12) is provided with a connecting member (16) to the manipulator (11) in a direction of assembly between them and a adjacent support beam (17) for gripping heads (18a-18c) which is oriented perpendicularly to said assembly direction and perpendicular to a main direction (D2) of extension of the gripping heads (18a-18c) oriented next the main extension direction (D1) of the sleepers (4a-4c) assigned to them. 9, - Loading station according to claim 8, characterized in that said beam (17) forms a support of a control element (19) of the individual implementation of each of the gripping heads (18a-18c ), the implementation of which is placed under the control device (5). 10, - Loading station according to any one of claims 7 to 9, characterized in that each of the gripping heads (18a-18c) is equipped with at least one positioning member (20a) on the gripping head ( 18a-18c) of the crossbar (4a-4c) assigned to it, of at least one clamping member (20c) of said cross member (4a-4c) which is assigned to it, of at least one support member (20b) of said cross member (4a-4c) which is assigned to it against the gripping head (18a-18c), and of at least one presence sensor (20d) on the gripping head (18a-18c) of said crossbar (4a-4c) assigned to it.