EP0773611B1 - Transport device for a cable manufacturing machine - Google Patents

Description

The invention relates to a transport device for with plugs, in particular Insulation displacement contact elements, equipped articles, the so-called Articles that are positioned linearly one after the other on an article feeder one and through a contacting station of a cable assembly machine.

Cable assembly machines are known with which only conductors are the same Length can be processed. In practical application to Example on washing machines, however wire harnesses are needed, their individual conductors have different lengths in order to reach from the control panel individual machine parts, such as pumps, solenoid valves, controllers, Drum drives and the like. Can be performed in different Distance to the control panel are arranged. There is therefore a need for a wire harness whose individual conductors or sets of wires are the highest different lengths are provided with housing modules at their ends.

In earlier European patent applications 95 11 1725.8 and 95 11 0515.4 the applicant describes cable assembly machines that an automatic assembly of conductors of different lengths Allow articles in single conductor processing, whereby the assembly in various steps is carried out in such a way that grid jumps are made can be and pairings of different connector systems the same grid dimensions are possible with each other, further processing, such as performing testing from the Contacting process itself can be decoupled. For this purpose, the line before Fixed to length with its free end in a first working level, is then the line from the supply of lines with continuous feed will be updated until the desired length of the cable is reached other end of the line fixed and the cable in the desired length cut to length and finally the cable is preferably arranged below Contact position pivoted into a second working level, after which its free ends are moved outwards to both cable ends at the same time in one insulation piercing terminal of the separately supplied To press insulation displacement contact element, which in a housing chamber one of several housing chambers with a certain grid spacing Housing sits (article), with this contacting on the fixing, providing length and cutting to length on the first working level next cable is carried out, which after swiveling in the second working level with a further insulation displacement contact element of the Housing is contacted, etc. Then the like completed line sets for further processing or removal fed.

From US-A-4 918 804 is a transport device of the type mentioned is known to be moved along the article rail by means of a push unit in the articles to be loaded.

To preferably on such a cable assembly machine, however without limitation to this type of machine, the drawing of the articles and their transport to the contacting station and further through connected processing stations in a simple way can not be conventional Transport facilities can be used. So far the articles in article rails of the cable assembly machine, where the feed was effected with cylinder drives. At least it had to a rail can be traversed, which then takes up a lot of space If large cable lengths of up to 3000 mm had to be processed, then the cross-movable article rail at a distance of 3000 mm had to be brought to the first rail.

The invention has for its object to develop a transport device of the type described in such a way that small and large cable lengths can be processed on the same machine without adjustment with much less space and a transport of the articles for contacting and further processing is possible such that each Any position can be approached forwards and backwards, so that a highly flexible processing is provided, which can process a wide variety of connector programs, for example Rast 2.5 and Rast 5 with the associated line spectrum of different lengths and with grid jumps at high processing speed with great positioning accuracy.

The object is according to the invention by a transport device solved according to the characterizing part of claim 1. The article carrier with a rail-like article holder and be provided with a mounting rail for the transport movements. Of the The core idea of the present invention is therefore that of the Article feed supplied with insulation displacement contact elements equipped housing in a separate article carrier, preferably in a row in a row, collect and on the article carrier of the Packaging to be supplied, being for the movements of the article carrier the grid transport device is provided by the processing stations. This is the first time that the articles are positioned correctly exactly the intended position regardless of the article geometry and regardless of the grid dimensions to be processed, whereby also No jumps in the grid are difficult. Due to the high positioning and Repeatability can be an exceptional speed are observed, which in turn are too high in the cable contacting machine Clock numbers can be exploited. The movability of the Raster transport device in both directions provides great flexibility for processing ready.

The article carrier preferably consists of an essentially rectangular one Base plate, under which a mounting rail guide on each long side is arranged, which interact with rollers of the cable assembly machine, on the base plate L-shaped on the inside long side a vertical support plate is attached to the article holder while a rack on the outside long side as part of the grid transport device is arranged with a toothed belt drive of the cable assembly machine cooperates. Due to the L shape of the cross section the article carrier can be the bottom of the in a very simple manner Base plate for arranging the motion control, the inner long side for the freely accessible arrangement of the article holder and the Outside long side for the arrangement of the rack as part of the Use the grid transport device.

A further improvement is according to the expedient design of the Invention achieved in that in the free interior of the L-cross section of the Article carrier for the exact alignment of the articles according to the grid dimension a rocker is provided which corresponds to the toothing of the articles Teeth contour on the side adjacent to the articles has, by pivoting the rocker with each other in or out Can be brought into engagement and thus a centering device for the articles represent. The rocker is preferably spring-loaded for engagement, the Centering toothing by a pressure roller acting on the rocker except Intervention can be brought (for removal). The rocker is preferably L-shaped in Cross-section formed, the vertical leg in one Recess of the vertical support plate is arranged and there provided toothing through a window of the vertical support plate in the Article holder located article detected. The other horizontal arranged leg of the rocker is spring-loaded, being against the Spring action by means of the pressure roller already mentioned, the pivoting of the Rocker made to release the positive connection with the articles can be.

The rack of the article carrier advantageously has a round toothing on, the toothing of the toothed belt is adapted accordingly. The mounting rail guide advantageously consists of a mounting rail with a round rod axis held in it, which corresponds to a corresponding Ring groove of the rollers of the cable contacting machine engages and such Defined, almost play-free linear movement of the article carrier through the processing stations enables. The rollers are evenly spaced on both sides of the article carrier in rows on a work table Cable assembly machine arranged, the rollers of the rows are offset from each other by half their distance.

A servo motor can expediently be used for the toothed belt drive Cable assembly machine are provided, the toothed belt over Deflection rollers parallel to the direction of passage of the article carrier for the intervention with the rack is guided. With a toothed belt in the rack Pressing pressure bar an improved form fit is guaranteed, whereby additionally in the contacting position a pressure roller for a secure Fixation during contacting ensures. Another pressure roller can be in the Movement path in front of the contact position is provided at a machine point be the reference point for controlling the machining operations serves. The start-up is started by means of an initiator arranged adjacent controlled.

The cable assembly machine described at the outset also has the first, high-level working level for the cable feed one below second working level, namely the contacting level or further processing level on, which is also arranged relatively high to a Provide length of the cable in the form of a sagging downward To allow loop between the two ends to be contacted. Around on the one hand, the machine height for vertically arranged bar magazines to be able to use and on the other hand the processing speed for the Increasing items is according to an appropriate embodiment of the invention proposed to arrange the article rail on an article feed level, those at a distance below the level of contacting and others Processing is arranged, with the loaded article carrier on the article feed level can be raised to the contacting level with a lifting device and can be moved into the grid transport device. At the end of the processing line is then a removal station for the ready-made Cable provided and can the unloaded article carrier by means of a lowering device lowered back to the article feed level and with a Return transport device can be transported back to the loading station. Hereby there is advantageously a closed transport circle for the Article carrier in the different levels, which is carried out extremely quickly can be achieved, thereby allowing fast machine cycle times.

A lifting device and / or lowering device is preferably used up and down between article feed and contact level movable lift for the article carriers at the beginning and end of the Processing line arranged in which the article carrier on one or several straps rest slidably, the for the return transport of the unloaded article carrier a conveyor belt on the article feed level is provided between the lifts.

Although one-sided assembly of items with cables is required but the production of cable harnesses or cable branches as a rule, their Lines at both ends with insulation displacement contact elements for opposite Processing of any assembly variants contacted are. An article feed is then closed on the cable assembly machine both ends of the line required. It is therefore advantageous to proposed transport device according to the invention, the article feed by means of the article carrier and the grid transport device on both sides symmetrical to the longitudinal axis of the contacting station of the To arrange cable assembly machine. The entire transport assembly there are therefore two for the article feed, so that each end of the cable branch to be manufactured by means of article carrier and grid feed with Articles for contacting and processing is supplied.

Furthermore, in an expedient embodiment of the invention, it is proposed that linear extensions in modular design to several processing stations to make, with lift arrangements only on the outer modules required are.

Fig. 1

eine Gesamtanlage zur Kabelkonfektionierung in perspektivischer Darstellung,

Fig. 2

einen Modul der Anlage in vergrößerter perspektivischer Darstellung mit Rastertransporteinrichtung,

Fig. 3

einen Artikelträger in Draufsicht,

Fig. 4

einen Artikelträger in Seitenansicht, teilweise im Schnitt,

Fig. 5

die Rastertransporteinrichtung der Fig. 1 mit Artikelträger in einer schematischen Draufsicht,

Fig. 6

eine Seitenansicht der Fig. 5,

Fig. 7

eine Rastertransporteinrichtung mit Artikelträger-Umlauf, perspektivisch-schematisch,

Fig. 8

einen Lift in einer Frontansicht, teilweise im Schnitt, wie er in der Vorrichtung der Fig 7 Verwendung findet,

Fig. 9

den Lift in Draufsicht und

Fig. 10

den Lift in einer Vorderansicht.

Further details, features and advantages of the invention result from the following description of the accompanying drawing, in which a preferred embodiment of the invention is shown schematically. The drawing shows:

Fig. 1

a complete system for cable assembly in perspective,

Fig. 2

a module of the system in an enlarged perspective view with grid transport device,

Fig. 3

an article carrier in top view,

Fig. 4

an article carrier in side view, partly in section,

Fig. 5

1 with article carrier in a schematic plan view,

Fig. 6

5 shows a side view of FIG. 5,

Fig. 7

a grid transport device with article carrier circulation, perspective-schematic,

Fig. 8

4 shows a lift in a front view, partly in section, as used in the device in FIG. 7,

Fig. 9

the lift in top view and

Fig. 10

the lift in a front view.

The cable assembly system shown is used for single-wire processing in four modules I - IV connected in series, each complete individually Represent cable assembly machines. Every machine is conceptual constructed so that the plug range Rast 2.5 and Rast 5 with the associated Line spectrum is processable. The presentation of the four modules I - IV illustrates the flexible upgradeability and convertibility of the system. In the delivery of the individual conductors from a barrel F takes place in each module, whereby in the contacting station after performing a cutting process up to 3000 mm on both sides with housings Terminal contact elements of certain grid dimensions are contacted.

The supply of the housings equipped with insulation displacement contact elements, the so-called articles is carried out by means of an article feeder 1 two article rails arranged parallel to each other, in which the articles are positioned linearly one behind the other.

Individual or multiple articles are removed from the article rails using an article positioner, which is not shown in the drawing, in article carrier 2 inserted, in which they during the entire assembly process remain. Because of the multiple module design of the system 1 is a buffer section 3 for the parallel operation of the four modules There are several article carriers in a row on both processing sides 2 contains. With just one cable assembly machine in the Such a buffer section is unnecessary in the system.

Following the buffer section 3, the article carriers enter the cable assembly machine 4, as shown enlarged in Fig. 2 of the drawing is. The cable pulling device, not specified, leads from the Take F out a single wire after a blank and node detection in a cable straightener, in which a straightening by horizontal and vertical roller combinations 5 takes place. Then that will Cable gripped by a feed device and further towards a Contacting station 6 of the cable assembly machine moved. The Contacting station 6 is located at the interface of the in the drawing of left article feed 1 and the cable feed as described above, which are arranged at right angles to each other.

The article feed works with that shown in Fig. 1 of the drawing Magazine from which those equipped with insulation displacement contact elements Housing (article) on the article rails in two rows for an opposite one Processing the article carriers 2 are supplied. The article carriers 2 are in the cable assembly machine in a manner described in more detail below 4 spent and there by a grid transport device 7 taken over, whose toothed belt driven by a servo motor 8 the article carrier with the housings in cyclical feed, if necessary also push back into a contacting position in the contacting station 6 shifts.

It can be seen from FIG. 2 that a similar grid transport device 7 with a toothed belt 9 also for the other end of the cable branch to be manufactured is provided so that both sides of the contacting station 6 accordingly the double assembly of the line with articles at both ends a grid transport device 7 are provided. The timing belts 8 and 9 a longitudinal movement of the article carrier into the contacting station 6 in and on through all processing stations until removal of the ready-made cable. For this purpose, the timing belts 8, 9 from driven by a servo motor, any position of the article carrier can be approached forwards and backwards.

An article carrier can be found in detail in FIGS. 3 and 4 of the drawing. Accordingly, each article carrier 2 consists of a rectangular base plate 10, under which a mounting rail guide 11, 12 is arranged on each long side. The mounting rail guides 11, 12 are provided with round rod axes 13, 14, the correspondingly grooved guide elements of the cable assembly machine intervene during grid transport.

On the base plate 10 on the inner longitudinal side is a perpendicular to the Base plate standing support plate 15 with an article holder 16 for the Article 17 attached. The article holder 16 is L-shaped in cross section rail-like recess in the support plate 15, in which the article 17th against falling out through the screwed, projecting Bar 18 are secured. On the opposite long side of the Article carrier a rack 19 is arranged on the base plate 10, the interacts with the toothed belt 8 of the grid transport device 7 and thus forms part of the grid transport device.

In the interior formed by the L-base shape of the article carrier 2 Article carrier 2 is a device 20 for centering and accurate Positioning of the article 17 installed in the bracket 16. The centering 20 consists of a around an axis 21 against the action of a spring 22nd pivotable rocker 23, which is directed towards the article holder 16 Toothed strip 24 is provided, which through a window 25 of the article holder 16 takes hold of and covers the series of Article 17, which are in the Bracket. The articles themselves have corresponding tabs provided on its back, which with the rack 24 to Centering work together. By pressure on the spring-loaded leg the gear engagement can be solved with the articles 17 and can the article 17 pushed out of the holder or when loading into the Article holder can be inserted.

The loaded article carrier 2 are the grid transport device 7 of the Cable assembly machine 4 supplied in a manner described below. The grid transport device 7 and the movement of the article carrier through the Cable assembly machine 4 are shown in FIGS. 5 and 6 Removable drawing. These show schematically in top view and Side view of the contact level with the work table 26 of the Cable assembly machine 4 with the one indicated by an arrow Direction of passage for the article carrier 2 on both processing sides of the Machine, i.e. for each end of the cable branch to be manufactured. On the Work table 26, a total of four rows of rollers 27 are arranged with the round rod axes 13, 14 of the mounting rail guides 11, 12 of the Article carrier 2 for guiding the movement of the article carrier 2 without play the cable assembly machine 4 serve. The rollers 27 have, as FIG. 6 the drawing can be seen, a circumferential lateral annular groove 28 for the Engagement of the associated round rod axes 13 and 14 respectively. Two each Adjacent rows of rollers 27 take the article carriers between them 2 on each processing page, whereby in the associated rows 29, 30 or 31, 32 the arrangement of the rollers against each other by half Distance is offset, so that five rollers in total the leadership of the Ensure the article carrier in the motion sequence.

The movement of the article carrier 2 through the cable assembly machine 4 is a servo motor with drive roller 33 of the cable assembly machine made on the endless toothed belt 8 or 7 with Gearing is transmitted. Each toothed belt is over pulleys 34 parallel to the direction of passage of the article carrier 2 for engagement with their Rack 19 guided, with a fixed pressure bar 35 the positive connection improved between toothed belt and rack. In addition, in the Contacting position, in Fig. 5 of the drawing by the reference number 36 marked dashed line is symbolized, a pressure roller 37th provided that the article carrier 2 against during the contacting process the opposite rollers 27 presses and thus for the Contacting process fixed. Another pressure roller 38 is in the path of movement provided in front of the contact position 36 at a machine point, the as a reference point for the control of the machining processes serves. Starting is effected by means of an initiator 39 arranged adjacent controlled.

The cable assembly machine 4 described above has in addition to the first high working level for the cable feed as arranged below second working level on the contacting level or further processing level, which is also arranged relatively high in the machine frame in order to provide a length of the cable in the form of a loop hanging downwards between the two ends to be contacted. It takes place the feeding of the articles takes place on an article feeding level, which in turn with Distance is arranged below the level of the contact, as Fig. 7 the Drawing in a perspective view can be removed. The loaded ones Article carriers 2 are from the article feed level by means of a lifting device, which is illustrated by arrow 40, can be raised to the contacting level and from there movable into the grid transport device 7. At the end of the work table 26 and thus the processing line is then a removal station (not shown in more detail) for the assembled cables and can the unloaded article carrier 2 by means of a lowering device, which by the Arrow 41 is illustrated, lowered to the article feed level and with a Return transport device 42 can be transported back into the loading station. This creates a closed transport cycle for the article carriers 2 in the different levels.

The lifting device 40 or lowering device 41 are respectively upwards and movable downwards between the article feed level and the contacting level Lifts for the article carriers 2, which are at the beginning and end of the worktable 26 or the processing section of the cable assembly machine are. Figures 8, 9 and 10 show the lift arrangements or their parts in a front view, a top view and a front view. Here is in a double webbing arrangement 44 is provided in a lift housing 43 (cf. Fig. 7), the upper strand 45 cross-hatched in Figures 8 and 9 of the drawing is recognizable. The article carrier intended for loading articles 2 rests in the starting position on the upper run 45 of the double belt arrangement 44 such that the article feed rail of the article feed continues coaxially into the article holder 16 of the article carrier 2. To the To be able to load items, the rocker 23 to pivot about the axis 21 against the action of its spring 22, that the rack 24 pivoted out of the path of movement of the article is and no longer protrudes into the article holder 16. For this purpose attached to the lift housing 43 a fixed pressure roller 46 which is suitable and it is intended to act on the spring-loaded leg of the rocker 23, to make the pivoting movement according to FIG. 8 of the drawing. For this purpose, the article carrier 2 from the upper run 45 of the webbing arrangement by means of a lifting cylinder 47 and one arranged on the lifting bolt 48 Driver 49 raised and shown in Fig. 8 of the drawing Move position in which the pressure roller 46 on the inner actuating leg the rocker 23 presses and this for loading from the article holder swings out. There is a second cylinder 50 for fixing and Centering of the article carrier 2 is provided.

After the complete loading of the article carrier 2 with a series of Article 17 is made, the article carrier 2 is double again Belt arrangement 44 lowered and lifted by a travel cylinder 51 up to the contacting level of the cable assembly machine method. By means of the double webbing arrangement 44 the Article carrier moved into the grid transport device 7 and by means of Toothed belt 8 or 9, which engages in the rack 19 of the article carrier 2, transported on. After the zero point acquisition for the machine control The article carrier is moved into the contacting position by the initiator 39 and will find the full contact of all those in the article there Insulation displacement contact elements instead. It can by means of a servo motor and reversible grid transport device any point in any Order can be approached.

It is then forwarded, possibly with further processing, the not be described in detail here until the sampling station, where the populate ladder are removed and the article carrier 2 is emptied. For this purpose is an extension device, not shown, which is above the Article carrier is arranged, provided in the removal station, the one has pneumatically operated slide that is horizontally movable. Here the article carrier 2 stands on the lowering device 41, like the one described above Lift is constructed and also a double webbing arrangement 51 having. The release of the article takes place as described above using a procedure against a pressure roller instead of the rocker, releasing the article holder panned. The empty article carrier comes with the lowering device Move down from the contact level to the article feed level and there by means of the return transport device 42, which essentially consists of a conveyor belt 52 is moved back to the loading position.

Reference list

1

Article feed

2nd

Article carrier

3rd

Buffer line

4th

Cable assembly machine

5

Combination of roles

6

Contacting station

7

Raster transport device

8th

Timing belt

9

Timing belt

10th

Base plate

11

DIN rail guide

12th

DIN rail guide

13

Round rod axis

14

Round rod axis

15

Support plate

16

Item holder

17th

items

18th

strip

19th

Rack

20th

centering

21

axis

22

feather

23

Seesaw

24th

Rack

25th

Window recess

26

Worktable

27

Casters

28

Ring groove

29

Row of castors

30th

Roller row 15

31

Row of castors

32

Row of castors

33

Servo motor with Drive roller

34

Pulleys

35

Pressure bar

36

Contact position

37

Pressure roller

38

Pressure roller

39

initiator

40

Arrow for lifting device

41

Arrow for lowering device

42

Return transport device

43

Lift housing

44

Double webbing arrangement

45

Obertrum

46

Pressure roller

47

Lifting cylinder

48

Lift bolts

49

Carrier

50

Centering cylinder

51

Double webbing arrangement

52

Conveyor belt

53

Drive motor belt straps

I-IV

Module F = barrel

Claims (18)

1. Transport device for articles fitted with plug connectors, in particular insulation displacement contact elements, which are positioned linearly one behind the other on an article feed towards and through a contact-making station (6) of a preformed cable machine (4),
   characterised by
   an article carrier (2) which can be conveyed forwards and backwards along the entire preforming operation by means of a grid transport device (7) having the unit size of the articles to be equipped (17) and on which articles to be equipped (17) can be fixed precisely in position arranged linearly one behind the other.
2. Transport device according to Claim 1 or 2, characterised in that the article carrier (2) is provided with a rail-like article mounting unit (16) and a support rail guide (11, 12).
3. Transport device according to Claim 1 or 2, characterised in that the article carrier (2) consists of a substantially rectangular base plate (10) under which on each long side a support rail guide (11, 12) is arranged which works together with track rollers (27) of the preformed cable machine (4), a vertical support plate (15) with the article mounting unit (16) being fastened on the base plate (10) in L-shaped manner on the inner long side while arranged on the outer long side as part of the grid transport device (7) is a rack (19) which works together with a toothed belt drive (toothed belt 8 or 9) of the preformed cable machine (4).
4. Transport device according to Claim 3, characterised in that in the open interior of the L-shaped cross-section of the article carrier (2) a rocker (23) is arranged which on its side adjoining the articles (17) possesses a toothed contour (toothed strip 24) corresponding to the toothed structure of the articles (17) which can be brought into or out of engagement with one another by pivoting the rocker (23) and in this way represent a centring device for the articles (17).
5. Transport device according to Claim 4, characterised in that the rocker (23) is placed under load in the centring direction by a spring (22), it being possible to shift the centring meshing out of engagement by means of a pressure roller (46) acting on the rocker (23).
6. Transport device according to Claim 4 or 5, characterised in that the rocker (23) is formed with an L-shaped cross-section, the vertically positioned limb being arranged in a recess (25) of the vertical support plate (15) and the toothed structure (24) provided there catching the articles (17) located in the article mounting unit through a window in the vertical support plate (15) and the horizontally positioned limb of the rocker (23) being provided as an actuating limb.
7. Transport device according to one of Claims 2 to 6, characterised in that the rack (19) of the article carrier (2) and the teeth of the toothed belt (8 or 9) possess a rounded toothed structure.
8. Transport device according to one of Claims 2 to 7, characterised in that each support rail guide (11 or 12) consists of a support rail having a round bar axle (13 or 14) held therein which engages in a corresponding annular groove (28) of the track rollers (27).
9. Transport device according to one of Claims 1 to 8, characterised in that the article carriers are guided in rows of track rollers (29, 30 or 31, 32) in which the track rollers are arranged at a uniform distance from one another on both sides of the article carrier (2) on a workbench (26) of the preformed cable machine (4), the track rollers (27) in the rows (29, 30; 31, 32) being offset with respect to one another by half their spacing.
10. Transport device according to one of Claims 2 to 9, characterised in that a servodrive (33) of the preformed cable machine (4) is provided as the toothed belt drive, the toothed belt (8 or 9) being guided via guide rollers (34) parallel to the direction of passage of the article carriers (2) for engagement with the rack (19) of the latter.
11. Transport device according to one of Claims 2 to 10, characterised by a pressing strip (35) for each toothed belt (8 or 9).
12. Transport device according to one of Claims 1 to 11, characterised by a pressing roller (37) for the article carrier (2) arranged in contact-making position.
13. Transport device according to one of Claims 1 to 12, characterised by a further pressing roller (38) in the path of movement ahead of the contact-making position.
14. Transport device according to one of Claims 1 to 13, characterised in that the article rail is arranged on an article feed plane which is arranged at a distance below the plane of contact-making and further handling, it being possible to raise the loaded article carriers (2) on the article feed plane using a lifting device (arrow 40) onto the contact-making plane and to move them into the grid transport device (7).
15. Transport device according to Claim 14, characterised in that at the end of the handling section a removal station is provided for the preformed cable and that the unloaded article carriers (2) are lowered once more to the article feed plane by means of a lowering device (arrow 41) and can be transported back using a return transport device (42).
16. Transport device according to Claim 14 or 15, characterised in that the lifting device and/or lowering device provided for moving upwards and downwards respectively between the article feed and contact-making plane is a lift for the article carriers (2) at the beginning and end of the handling section in which the article carriers (2) rest displaceably on one or more belt straps (44), a transport belt (52) being provided on the article plane between the lifts for the return transport of the unloaded article carriers (2).
17. Transport device according to one of Claims 1 to 16, characterised by a buffer section (3) between the article rail and grid transport device (7).
18. Transport device according to one of Claims 1 to 17, characterised in that the subassembly is provided in duplicate in such a way that the article feed by means of the article carriers (2) and the grid transport device (7) is arranged on both sides symmetrically with respect to the longitudinal axis of the contact-making station of the preformed cable machine.

Images