EP0788200A2 - Device for laying cables - Google Patents

Abstract

The device has a dividing wall (16) between two separated regions in which the cables (3,4) are laid and stretched. These regions are formed by the upper length of an endless transport belt (17). A pivot arm (22) equipped with a cable gripper (21) guides the rear ends of both cables to a treatment station within the range of the arm. The pivotal movement away from the structure instigates the transfer of one cable (4) into one of the two cable stowage troughs. A separate motorised lever is provided for transfer of the other cable into its trough.

Description

The invention relates to a cable storage device for automatic wire processing machines for the simultaneous separate storage of two individually cut and stretched cables or two cut and stretched cables connected at one end to a double cable on at least one receiving conveyor belt and for separating these cables after their processing, and an extension part for these Cable storage device.

It is known to produce double crimp cables by means of automatic wire processing machines, in which two cables of possibly different cross-sections and different lengths are connected to one another at one end by means of a single crimp contact, and were likewise connected to a crimp contact at their other ends. In particular with longer cable lengths, however, the risk of tangling of the two cable sections connected to one another suddenly increases and requires immediate removal, particularly with long cable lengths and spatial separation of the two free cable sections by hand, as well as a corresponding storage.

A parallel parallel processing of two different cables of greater length in a single cable processing machine has not become known because of the risk of such different cables becoming entangled.

The object of the present invention is to provide a cable storage device of the type mentioned at the outset, which does not have the above-mentioned disadvantages of the previous devices, i.e. by means of which two cables processed parallel to each other, even if they are connected at one end via a double crimp contact, are spatially separated from one another and stretched at least approximately over their entire length and can be stored separately in two parallel cable trays.

This object is achieved according to the invention by means of a cable storage device according to claim 1 or 2.

Advantageous further developments of the device according to the invention are the subject of claims 3 to 19.

The invention further relates to an extension part according to claim 20 for the cable storage device according to one of claims 1 and 2.

• Fig. 1 im Grundriß schematisch die Kombination einer ersten beispielsweisen Ausführungsform einer erfindungsgemässen Kabelablagevorrichtung mit einen bekannten Kabelverarbeitungsautomaten;
• Fig. 2 eine perspektivische Ansicht der in Figur 1 dargestellten Kabelablagevorrichtung;
• Fig. 3 eine perspektivische Ansicht analog Figur 2, jedoch mit einem um einen Schritt gedrehten Ablagestern;
• Fig.4 in größerem Maßstab eine eintrittsseitige Stirnansicht der in den Figuren 1 bis 3 dargestellten Ablegevorrichtung;
• Fig. 5 in größerem Maßstab einen Querschnitt durch den Antrieb einer zweiten beispielsweisen Ausführungsform einer erfindungsgemässen Kabelablagevorrichtung mit zwei parallel zueinander verlaufenden Kabelablage-Transportbändern; und
• Fig.6 eine perspektivische Ansicht analog Figur 2, jedoch mit einem Verlängerungsteil für den Einsatz bei längeren Kabeln.
• Fig.7 bis 12 eine Stirnansicht analog Figur 4 einer weiteren erfindungsgemäßen Ausführungsform der Ablegevorrichtung, anhand welcher die einzelnen Bewegungsabläufe der letzteren dargestellt sind; und
• Fig. 13 in kleineren Maßstab einen Grundriß der in Fig. 7 dargestellten Ablagevorrichtung.

The invention is explained in more detail below with reference to the drawing, for example. Show it:

• Fig. 1 schematically shows the combination of a first exemplary embodiment of an inventive Cable storage device with a known automatic cable processing machine;
• FIG. 2 is a perspective view of the cable storage device shown in FIG. 1;
• 3 shows a perspective view analogous to FIG. 2, but with a storage star rotated by one step;
• 4 shows, on a larger scale, an entry-side end view of the depositing device shown in FIGS. 1 to 3;
• 5 shows, on a larger scale, a cross section through the drive of a second exemplary embodiment of a cable storage device according to the invention with two cable storage conveyor belts running parallel to one another; and
• 6 shows a perspective view analogous to FIG. 2, but with an extension part for use with longer cables.
• 7 to 12 an end view analogous to FIG. 4 of a further embodiment of the depositing device according to the invention, on the basis of which the individual movement sequences of the latter are shown; and
• Fig. 13 on a smaller scale a floor plan of the storage device shown in Fig. 7.

In all the figures, parts that are analogous to one another are provided with the same reference numerals, so that a repeated description of the parts that are analogous to one another is unnecessary.

As can be seen in particular from FIG. 1, the cable storage device 1 according to the invention is connected to a conventional, previously known automatic wire processing machine 2 to form a common work unit, and is used for the separate storage of cables 3 and 4 processed by the automatic wire processing machine 2 for the production of so-called double crimp cables.

The two cables 3 and 4 are supplied in a known manner by means of the two tape drive units 5 and 6 to a swivel head 7, which feeds the front ends of the cables 3, 4 to one or more of the processing stations 8 to 11 for their stripping and subsequent pressing on of a crimp contact.

After this processing of the front ends of the two cables 3, 4, these are ejected into the cable storage device 1 at high speed along the two ejection movement axes 12, 13 (see FIGS. 1 and 4).

Between the two ejection movement axes 12, 13 of the cables 3, 4 which are conveyed out of the automatic cable processing machine 2, a vertical dividing wall 16 extending along the latter and between them is provided to form two receiving and stretching areas 14 and 15 which are arranged on both sides and are separated from one another. The two receiving and stretching areas 14 and 15 are formed by an upper entrainment portion of an endlessly encircling receiving conveyor belt 17, which extends horizontally below the partition 16 on both sides of the partition 16. The latter is guided over the two deflection rollers 18 and 19 and driven by means of a drive motor 20 connected to the deflection roller 19 in such a way that the rotational speed of the take-up conveyor belt 17 is greater than the ejection speed of the two from the cable processing machine 2 emerging cables 3 and 4 in order to achieve an elongated reception of the latter two on the two longitudinally separate accommodation and extension regions 14 and 15.

In the cable entry area of the receiving conveyor belt 17 there is a swivel arm 22, provided with a double gripper 21, for gripping the rear ends of the two cables 3, 4, as seen in their transport direction, for feeding the two cables 3, 4 to an intermediate unit 23 located in the swiveling area of the swivel arm 22 , where the two stripped cable ends are combined, and then provided for a double crimping unit 24, where the two ends are connected to a common crimp contact 25. The swivel arm 22 provided with the double gripper 21 can represent part of the automatic cable processing device 2 or part of the cable storage device 1.

The servomotor 26 is used for precisely controlled pivoting of the swivel arm 22 and the servomotor 27 for longitudinal displacement of the latter.

Beneath the two longitudinal sides 28 and 29 of the two cable receiving and stretching areas 14 and 15, which are separated from each other by the partition 16, and extending over their entire length, a cable tray 30 or 31 is provided for storing the finished cables 3 'and 4'.

In order to be able to tie the two separated, divided strands 3 'and 4' separately from one another in the respective cable storage trays 30 and 31 after production of the desired lot size without interruption of the system and then to be able to remove the entire cable bundle from the two storage trays 30 and 31 in this manner, are, as can be seen particularly from FIG. 4, four pairs of cable storage trays 30, 31 in a paddle wheel-like manner about an axis of rotation 32 extending parallel to the two receiving and stretching areas 14, 15, in each case gradually rotatable about the angular range of 90 ° detected by a pair of tubs 30, 31.

A pair of troughs 30, 31 each have three boundary walls 33, 33 'and 34 which extend in radial planes and along the axis of rotation 32, the middle boundary wall 34 in each case forming a partition between two adjacent cable storage troughs 30, 31 of a pair of troughs, the leading edge 35 of which on the entry side is set back with respect to the two front edges 36, 36 'of the two outer boundary walls 33, 33' of the pair of tubs 30, 31 on the inlet side.

In order to be able to remove a tied double crimp cable harness 3 ′, 4 ′ more freely from a pair of cable troughs 30, 31, the front edges 35 of the dividing walls 34 on the entry side are additionally tapered radially outward toward the rear.

In order to be able to accommodate the finished double crimp cables 3 ', 4' over their entire length in the double troughs 30, 31 formed in this way, the entry-side front edges 36, 36 'of the two outer boundary walls are located in the plan of the device and in the direction of movement cables 3, 4 conveyed out of the automatic cable machine 2, seen in front of the delivery point of the double gripper 21 provided on the swivel arm 22.

In order to prevent the finished cables 3 ', 4' from falling out of the double trays 30, 31 when the paddle wheel-like arrangement of the double trays 30, 31 is rotated from the receiving position into the removal position by an angle of rotation of 90 °, the boundary walls 33, 33 ' and 34 of the cable storage trays 30, 31 along their outer side 37 running parallel to their axis of rotation 32 in the direction of rotation A of the same, opposite to the latter, bent backwards.

This arrangement of the two cable storage trays 30 and 31 to be loaded below the discharge longitudinal sides 29 and 28, respectively, ensures that when the pivoting arm 22 swings out toward the double crimping unit 24, the cable section of the cable 4 which is deflected thereby is moved laterally in the deflection direction beyond the discharge longitudinal side 28 of the receiving conveyor belt 17 , whereby, together with the circulating movement of the latter, the cable 4 is ejected into the storage tray 31 located underneath.

The second cable 3 can be dropped over the discharge longitudinal side 29 into the storage tray 30 located below it, either by analogous pivoting of the pivot arm 22 in the opposite pivoting direction B (see FIG. 2) or by means of a pivot lever 39 driven in each case by a drive motor 38 which can be rotated through 180 ° be effected.

In order to be able to extend this cable storage device for processing extremely long cables, as can be seen in FIG. 6, with the aid of an analog extension unit 1 ', the rear end face of the double-tub rotor 40 must be free for coupling an analog extension rotor, i.e. the rotor drive motor 42 must e.g. 5, can be arranged, and in order not to hinder a lateral throwing off of the cable 3 over the elongated discharge side 29 thus elongated. In this case, the leading edges 35, 36 and 36 'on the entry side of the extension part 1' can all lie in a single radial plane, since the boundary walls 33, 33 'and 34 of the extension part resp. of the double-tub rotor 40 'only serve to extend the corresponding boundary walls of the front double-tub rotor 40 in its axial direction.

It is of course also possible with the illustrated cable storage device to provide two completely separate individual cables with crimp contacts on both sides when using corresponding processing units and to store them separately in the assigned storage trays 30 and 31.

It has now been shown that it would often be desirable if the processed cables or double cables could be removed further away from moving parts of the cable storage device and, because of the better clarity, more from above.

The present invention therefore also relates to a further development of the cable laying device described above, which allows the processed cables or double cables to be removed further away from moving parts of the cable laying device described there and more from above.

As can be seen from FIGS. 7 to 13, the embodiment of a cable storage device according to the present invention described below has a single cable storage tray pair 30, 31 for this purpose instead of the paddle tray pairs 30, 31 arranged in the manner of a paddle wheel, which is arranged parallel to the two receptacles. and stretching areas 14, 15 extending pivot axis 32 is pivotable and can be emptied downward into a parallel lower cable removal trough pair 43, 44, the upper pair of cable trays 30, 31 extending along the pivot axis 32 Has boundary walls 33,33 'and 34. The lower pair of cable troughs 43, 44 is about a further pivot axis 45, which runs parallel to the swivel axis 33 of the upper cable storage trough pair 30, 31 and is laterally offset in plan in relation to this swivel axis 32, from a cable take-up position (FIG. 7) to a laterally offset removal position (FIG. 11) can be pivoted, and has boundary walls 46, 46 'and 47 extending along the further pivot axis 45.

The middle boundary wall 34 of the upper pair of cable storage trays 30, 31 forms a common partition between the two adjacent cable storage trays 30, 31 of the pair of cable storage trays 30, 31, and the central boundary wall 47 of the lower pair of cable trays 43, 44 forms a common partition between the two adjacent cable removal trays 43 , 44 of the lower pair of cable troughs 43, 44.

The entry-side front edge 35 of the middle partition wall 34 of the upper cable storage tray pair 30, 31 is set back analogously to the exemplary embodiments described above compared to the two entry-side front edges 36, 36 'of the two outer boundary walls 33, 33' of the upper cable storage tray pair 30, 31. The entry-side front edges 36, 36 'of the two outer boundary walls 33, 33' of the upper pair of cable storage trays 30, 31 are located in the plan of the device and in the direction of movement A of cables 3, 4 conveyed out of the automatic cable machines 2 in front of the delivery point on the swivel arm 22 Cable gripping parts 21 (see Fig. 6).

The boundary walls 33, 33 'and 46, 46' and the two partition walls 34 and 47 and the swivel ranges of the two Tray pairs 30, 31 and 43, 44 are matched to one another such that when the upper pair of cable trays 30, 31 is pivoted by means of a pneumatic or hydraulic linear cylinder 51 into its emptying position shown in FIG. 9, the partition 34 of the upper pair of trays 30, 31 extends into the interior one associated lower cable removal trough 44 and the lower wall 33 ′ of this pair of troughs 30, 31 located in the emptying position of the upper pair of troughs 30, 31 is moved into the interior of the other assigned lower cable removal trough 43 in order to ensure a trouble-free, separate transfer of the processed cables 3 ', 4' into the lower pair of cable troughs 43,44. Here, the outside of the tub 31 comes into engagement with the lower pair of tubs 43, 44 via one or more rollers 52 (see FIGS. 8 and 9) arranged on the upper longitudinal edge of the boundary wall 46 'and pivots this against the action of a pneumatic spring 53 on the left in its receiving position. The lower pair of cable troughs 43, 44 can be pivoted about a first further pivot axis 45 in order to pivot to the left against the upper pair of cable trays 30, 31.

After the processed double crimp cables 3 ', 4' have been released from the upper pair of trays 30, 31 into the lower pair of trays 43, 44, the upper pair of trays 30, 31 is moved back into its starting position by means of the linear cylinder 51 in the counterclockwise direction, thereby giving the lower one Pair of tubs 43, 44 is free again, which also returns to its starting position shown in FIG. 10 under the influence of the pneumatic spring 53.

As seen in FIG. 13, the left end part of the cable storage device 1, as can be seen in FIG. 1, is in the region of the cable processing machine 2 and therefore the left end part of the lower pair of cable troughs 43, 44 for removing the processed cable pairs 3 ', 4' is usually not very accessible, the lower pair of cable troughs 43, 44 is now using a linear cylinder 54 along one parallel to The pivot axis 32 of the upper pair of cable storage trays 30, 31 and laterally offset in relation to this pivot axis 32 in the plan (FIG. 13) seen laterally offset two-part longitudinal guide 49, 50 in direction A from a cable receiving position to a lengthwise direction in FIG. 13 to the right by an amount shifted from, for example, 500mm end position.

In order in this end position of the longitudinal displacement of the lower pair of trays 43, 44 to pivot the latter out as far as possible (to the right in FIG. 11) by means of a pneumatic or hydraulic linear cylinder 55 into a cable removal position with consistently good accessibility of the lower pair of trays 43, 44 or In order to reach the cable pairs 3 ', 4' located therein, the lower pair of cable troughs 43, 44 can be pivoted outwards to form a larger swivel radius about a second swivel axis 48 provided below the first further swivel axis 45.

After the processed cable pairs 3 ', 4' have been removed from the lower pair of trays 43, 44, this is pivoted back into its upright position shown in FIG. 12 by means of the linear cylinder 54 and then in the longitudinal direction of the two-part longitudinal guide 49, 50 into its position shown in FIG. 13 apparent starting position is moved back, after which the entire working cycle described above with reference to FIGS. 7 to 13 is repeated.

Claims (20)

Cable storage device for automatic cable processing machines for the simultaneous separate storage of two individually cut and stretched cables or two cut and stretched cables connected at one end to a double cable on at least one receiving conveyor belt and for the separation of these cables after their processing, characterized in that between the two ejection movement axes ( 12, 13) of cables (3, 4) conveyed out of the automatic cable processing machine (2) to form two receiving and stretching areas (14, 15), which are arranged on both sides and are separated from one another, a partition (16) extending along the two latter is provided, the two receiving and stretching areas (14, 15) are formed by at least one upper driving dimension of an endlessly rotating receiving conveyor belt (17) that in the cable entry area of the latter one for gripping the rear ends of the two cables (viewed in their transport direction) ( 3, 4) certain swivel arm (22) provided with cable gripping parts (21) for feeding the rear ends of the two cables (3, 4) to be worked to at least one cable processing station (23, 24) located in the swiveling area of the swivel arm (22) provided, and in the event that the swiveling range of the swiveling arm (22) does not extend beyond both ejection movement axes (12, 13), on the entry side of the receiving and extending area (15), which is not dominated by the swiveling range of the swiveling arm (22), a cable ejector arrangement which can be moved laterally beyond the latter (39), and below the two cable discharge longitudinal sides (28, 29) of the two receiving and stretching areas (14, 15) separated from one another by means of the partition (16), and a cable tray (30, 31) extending over their entire length is. Cable storage device for automatic cable processing machines which, in its cable outlet area, has a swivel arm (22) for gripping the rear ends of two cables (3, 4) to be processed, provided with cable gripping parts (21), for feeding the rear ends of the two cables (3) to be processed. 3, 4) to at least one cable processing station (23, 24) located in the swiveling area of the swivel arm (22), characterized in that for the simultaneous separate storage of two individually cut and stretched cables or two cut cables connected at one end to form a double cable and stretched cables on at least one take-up conveyor belt (17) and for separating these cables after their processing between the two ejection movement axes (12, 13) of cables (3, 4) conveyed out of the automatic cable processing machine (2) to form two mutually arranged cables parried receiving and stretching areas (14, 15) is provided a partition (16) extending along the latter two, through the two receiving and stretching areas (14, 15) at least one upper entrainment point of an endlessly revolving receiving conveyor belt (17) is formed, and in the event that the swivel range of the swivel arm (22) does not extend beyond both ejection movement axes (12, 13), on the entry side of the swivel arm of the swivel arm ( 22) not protruding receiving and stretching area (15) a cable ejector arrangement (39) which can be moved laterally beyond the latter, and below the two longitudinal sides of the cable discharge (28, 29) of the two receiving and stretching areas (14 , 15) and extending over their entire length, a cable tray (30, 31) is provided. Cable storage device according to claim 1 or 2, characterized in that at least two pairs of cable storage trays (30, 31) are arranged to be movable alternately below the two longitudinal sides of the cable discharge (28, 29) of the two receiving and stretching areas (14, 15). Cable storage device according to claim 3, characterized in that at least three, preferably four, pairs of cable storage trays (30, 31) are paddle-wheel-shaped by one pair of trays (30, 31) parallel to the two receiving and stretching areas (14, 15) Rotational axis (32) extending in the angular range are gradually rotatable. Cable storage device according to claim 4, characterized in that a pair of troughs (30, 31) each have three, preferably at least approximately in radial planes and along the axis of rotation (32) extending boundary walls (33, 33 ', 34), wherein the respective central boundary wall (34) forms a partition between two adjacent cable storage trays (30, 31) of a pair of trays (30, 31), the front edge (35) of which on the inlet side is opposite the two front edge (36, 36 ') of the two outer boundary walls (33 , 33 ') of the pair of tubs (30,31) is set back and preferably extends radially outwards to the rear, and that the inlet-side front edges (36,36') of the two outer boundary walls (33,33 ') in plan view of the device and seen in the direction of movement of the cables (3, 4) conveyed out of the automatic cable machine (2), is located in front of the delivery point of the cable gripping parts (21) provided on the swivel arm (22). Cable storage device according to one of claims 4 or 5, characterized in that the boundary walls (33, 33 ') of the cable storage trays (30, 31) along their outer side running parallel to their axis of rotation (32) in the direction of rotation (A) of the same, opposite to the latter are turned backwards. Cable storage device according to one of claims 1 to 6, characterized in that the circulating speed of the at least one take-up conveyor belt (17) is higher than the ejection speed of the cables (3, 4) conveyed out of the automatic cable processing machine (2). Cable storage device according to claim 1 or 2, characterized in that an endlessly circumferential receiving conveyor belt (17, 17 ') is provided on each of the two long sides of the partition (16). Cable storage device according to claim 8, characterized in that a belt drive (42) acting on a common drive shaft (43) is provided outside the discharge area of the two receiving conveyor belts (17, 17 ') and between these. Cable storage device according to claim 1 or 2, characterized in that a pair of cable storage trays (30, 31) can be pivoted about a pivot axis (32) extending parallel to the two receiving and stretching areas (14, 15) and downwards into a pair of cable tray (43) running parallel to it , 44) can be emptied, the cable storage tray pair (30, 31) along the pivot axis (32) extending boundary walls (33, 33 ', 34), and that the cable removal tray pair (43, 44) by at least one, parallel to The pivot axis (32) of the pair of cable trays (30, 31), which is laterally offset in relation to this pivot axis (32) in plan, seen from the ground, can be pivoted from a cable receiving position (FIG. 9) to a laterally offset removal position (FIG. 11) , and has boundary walls (46, 46 ', 47) extending along the further pivot axis (45). Cable storage device according to claim 1 or 2, characterized in that a pair of cable storage trays (30, 31) can be pivoted about a pivot axis (32) extending parallel to the two receiving and stretching areas (14, 15) and downwards into a pair of cable tray (43) running parallel to it , 44) is arranged to be emptied, the pair of cable trays (30, 31) having boundary walls (33, 33 ', 34) extending along the pivot axis (32), and the pair of cable trays (43,44) along a parallel to the swivel axis (32) of the pair of cable trays (30,31) and laterally offset in relation to this swivel axis (32) seen in plan from the side of a cable receiving position (Fig. 9) in a Seen in the longitudinal direction, the displaced removal position is displaceable, and has boundary walls (46, 46 ', 47) extending along the longitudinal guide (49, 50). Cable storage device according to claim 10, characterized in that the pair of cable troughs (43, 44) runs along a longitudinal guide (49, 50), which is parallel to the swivel axis (32) of the cable storage trough pair (30, 31) and laterally offset in relation to this swivel axis (32) as seen in plan. is displaceable from a cable receiving position (FIG. 9) into a removal position seen in the longitudinal direction Cable storage device according to Claim 11, characterized in that the pair of cable troughs (43, 44) about at least one further pivot axis (45), which runs parallel to the swivel axis (32) of the cable storage trough pair (30, 31) and is laterally offset in relation to this swivel axis (32) in plan view ) can be swiveled from a cable take-up position (FIG. 9) into a laterally offset removal position (FIG. 11), Cable storage device according to claim 10 or 11, characterized in that the central boundary wall (34) of the pair of cable storage trays (30, 31) is a common partition between the two adjacent cable storage trays (30, 31) of the Cable storage tray pair (30,31), and the central boundary wall (47) of the cable removal tray pair (43,44) forms a common partition between the two adjacent cable removal trays (43,44) of the cable removal tray pair (43,44). Cable storage device according to one of claims 10 to 14, characterized in that the entry-side front edge (35) of the central partition (34) of the pair of cable storage trays (30, 31) opposite the two entry-side front edges (36, 36 ') of the two outer boundary walls (33, 33 ') of the pair of cable trays (30, 31) is set back, and that the entry-side front edges (36,36') of the two outer boundary walls (33,33 ') of the pair of cable trays (30,31) in the plan view of the device and in the direction of movement ( A) seen from cables (3, 4) conveyed out of the cable automat (2), is located in front of the delivery point of the cable gripping parts (21) provided on the swivel arm (22). Cable storage device according to one of claims 14 and 15, characterized in that the boundary walls (33,33 ';46,46') and the two partition walls (34; 47) as well as the pivoting ranges of the two pairs of troughs (30,31; 43,44) are matched to one another in such a way that when the upper pair of cable trays (30, 31) is pivoted into its emptying position (Fig. 9), the partition (34) of this pair of trays (30, 31) into the interior of the associated cable tray (44) and the in the emptying position (FIG. 9) of the upper pair of trays (30, 31) the lower boundary wall (33 ') of this pair of trays (30, 31) is moved into the interior of the other assigned cable removal tray (43). Cable storage device according to one of claims 10 to 16, characterized in that the lower pair of cable troughs (43, 44) is pivoted against the upper pair of cable trays (30, 31) by a first further pivot axis (45) and is pivoted in the opposite direction into it Removal position (FIG. 11) can be pivoted out laterally about a second further pivot axis (48) provided below the first further pivot axis (45). Cable storage device according to claim 16, characterized in that in the emptying position of the upper pair of trays (30, 31) the lower boundary wall (33 ') of this pair of trays (30, 31) bears against the inside of the associated lower boundary wall (46) of the lower pair of trays (43, 449) . Cable storage device according to claim 16 or 18, characterized in that in the emptying position of the upper pair of trays (30, 31) their partition (47) abuts the upwardly directed side surface of the partition (47) of the lower pair of trays. Extension part for the cable storage device according to one of claims 1 to 9, characterized in that it consists of the analogous elements as the cable storage device, without a swivel arm (22) possibly arranged on the latter and the elements (21, 26, 27) attached to the latter .

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