EP2399856B1 - Straightening device for straightening cables and corresponding method - Google Patents

Description

The invention relates to a straightening device for straightening cables and a corresponding method.

The invention particularly relates to straightening devices for cable processing machines. The cables, e.g. insulated strands or solid conductors made of copper or steel, which are processed on a cable processing machine, are usually provided in barrels, on rolls or as a bundle and are therefore more or less curved and swirled after unrolling.

Straight-line cables are important in order to reliably carry out the process steps provided on the cable processing machine, such as stripping, crimping and loading.

In order to straighten the cables as straight as possible, they are usually pulled with the help of existing in the cable processing machine drives through one or more, attached to the inlet of the machine, straightening devices. The above-mentioned curvatures and twist in the cables are eliminated.

Known straightening devices can be set only with great effort so that they provide optimal directivity. It is also difficult to reproduce a setting on the same straightening apparatus or other straightening machine or other machine in straightening machines, as is common in wire processing machines.

Known straightening devices have several roles, between which the cable to be straightened is passed. there So far solution approaches are used to adjust the roll distance, the engraved scales and set screws, partly with counter, use. It is sometimes also possible to automatically adjust the roller spacing by means of an actuator. The roles of the known straightening devices typically sit on two roller rails. The adjustment of the suit of straightening apparatus, ie the inclination of one or both roller bars is usually done by clamping by means of screws. Often, this adjustment is made using a rule of thumb that states that the output side rollers of the straightener should contact the cable. The suit is - for lack of easy adjustment and lack of simple adjustment criteria - often not changed.

However, the input-side rollers of the straightening apparatus, which develop the greatest directivity, are thus often in a non-ideal position.

So far, there are no simple, robust criteria or parameters for straightening devices that could, for example, be deposited together with a cable in order to optimally adjust the straightening device on any machine, depending on the cable type.

The rolls used today straighteners are adjusted depending on Richtgut with simple means to a specific position. However, this position is very critical. A small misalignment or a small deviation of the outside diameter (for example due to production variations in the cable production) or the elasticity in the cable (for example, depending on the temperature during processing), lead to greatly differing straightening results.

Cost-effective straightening devices are set today with a parameter, namely a feed movement of a bar with rollers perpendicular to the cable.

An already compared to the inexpensive straightening improved straightening apparatus is in EP0932462 (see also WO 98/12005 ). This prior art document proposes to arrange a first row of rollers at right angles to the cable axis. The suit results from the arrangement of a second row of rollers, which is additionally variable by floating support in a small frame in its angular position. However, the angular change is largely indeterminate, as it is determined by two compression springs, which also serve to open the straightening apparatus. In addition, the bias of these springs is changed by adjusting the distance between the two rows of rollers.

Another straightening device is off EP 0 739 066 A2 known. The straightener after EP 0 739 066 A2 relies on roller assemblies that are adjustable by two pivotal movements in both horizontal and vertical directions.

Here, the invention seeks to remedy this by avoiding disadvantages of the prior art. In particular, it is an object of the invention to provide a solution that provides reproducible results and their settings are transferable to other straightening devices, which are equipped according to the invention.

The invention as characterized in the main claim solves these problems.

The straightening device is designed for straightening cables and comprises an input-side roller arrangement and an output-side roller arrangement. These roller assemblies are arranged so that a cable to be straightened viewed in the transport direction between rollers of the input side roller assembly passes into the straightening device and after passing through between rollers of the output side roller assembly leaves the straightening device, wherein the straightening device is adjustable in two degrees of freedom. As the first degree of freedom, a distance between two rollers of the output-side roller assembly is precisely adjustable, and as a second degree of freedom, a force can be predetermined, which acts on the cable between two rollers of the input-side roller assembly perpendicular to the transport direction.

Advantageous developments of the invention are specified in the dependent claims.

In previous straightening machines is neglected that the mentioned suit should be changed depending on Richtgut, in order to achieve an optimal straightening result. For the first time, the invention offers the possibility of specifying and setting two degrees of freedom in a reproducible manner.

Reference to the accompanying figures, the present invention will be explained in more detail.

Fig. 1

eine erste Ausführungsform in einer schematischen Darstellung;

Fig. 2

eine zweite Ausführungsform in einer schematischen Darstellung;

Fig. 3

eine schematische Perspektivansicht einer Ausführungsform einer Richtvorrichtung;

Fig. 4A

eine schematische Draufsicht der Richtvorrichtung nach Fig. 3;

Fig. 4B

eine schematische Schnittansicht entlang der Achse A-A der Richtvorrichtung nach Fig. 4A;

Fig. 5

eine schematische Seitenansicht einer Ausführungsform einer Richtvorrichtung in einem offenen Zustand;

Fig. 6

eine schematische Seitenansicht einer Ausführungsform einer Richtvorrichtung in einem geschlossenen Zustand;

Fig. 7

eine schematische Seitenansicht einer Ausführungsform einer Richtvorrichtung in einem aktiven Zustand;

Fig. 8

eine schematische Perspektivansicht einer weiteren Ausführungsform einer Richtvorrichtung;

Fig. 9A

eine schematische Seitenansicht einer weiteren Ausführungsform einer Richtvorrichtung; und

Fig. 9B

eine schematische Perspektivansicht der Richtvorrichtung nach Fig. 9A.

Show it:

Fig. 1

a first embodiment in a schematic representation;

Fig. 2

a second embodiment in a schematic representation;

Fig. 3

a schematic perspective view of an embodiment of a straightening device;

Fig. 4A

a schematic plan view of the straightening device according to Fig. 3 ;

Fig. 4B

a schematic sectional view along the axis AA of the straightening device according to Fig. 4A ;

Fig. 5

a schematic side view of an embodiment of a straightening device in an open state;

Fig. 6

a schematic side view of an embodiment of a straightening device in a closed state;

Fig. 7

a schematic side view of an embodiment of a straightening device in an active state;

Fig. 8

a schematic perspective view of another embodiment of a straightening device;

Fig. 9A

a schematic side view of another embodiment of a straightening device; and

Fig. 9B

a schematic perspective view of the straightening device according to Fig. 9A ,

The term "input side roller assembly 110" is used for an arrangement of two, three or more rollers (eg rollers 111-113 in FIG Fig. 1 or Fig. 2 ) used. The term "output side roller assembly 120" is used to refer to an arrangement of two, three or more rollers (eg rollers 121-124 in FIG Fig. 1 or Fig. 2 ) used. On the input side means that it is a corresponding arrangement, which is in front of the rollers of the output-side roller assembly 120 with respect to the transport direction X of the cable 1. That is, the cable 1 first passes between the rollers of the input-side roller assembly 110 and only then between the rollers of the output-side roller assembly 120 therethrough.

Either the rollers of the input side roller assembly 110 are held by a first pair of spaced roller plates and the rollers of the output side roller assembly 120 are held by a second pair of spaced roller plates. In this case, however, the mechanical complexity is greater than in an embodiment based on the in Fig. 2 is shown, in which a first roller plate 130 a part of the rollers (here the rollers 111, 113) of the input side roller assembly 110 and a part of the rollers (here the rollers 121, 122) of the an output side roller assembly 120 carries, and a second roller plate 140 another part of the rollers (here the rollers 112) of the input side roller assembly 110 and another part of the rollers (here the rollers 123, 124) of the output side roller assembly 120 carries.

This in Fig. 2 The principle shown is mechanically easier to implement, since only the distance d and the force F (resulting in a pressure acting on the cable 1) of the two roller plates 130, 140 must be controlled controlled relative to each other. In an embodiment with four roller plates, the setting / adjustment effort is somewhat greater.

Two basic straightening devices 100, which are equipped for straightening cables 1 with an input-side roller arrangement 110 and an output-side roller arrangement 120, are the Figures 1 and 2 refer to. The roller assemblies 110, 120 are arranged so that a cable 1 to be straightened, viewed in the transporting direction X, passes between the rollers 111, 112, 113 of the input-side roller assembly 110 into the straightening device 100. After passing between the rollers 121, 122, 123, 124 of the output side roller assembly 120, the cable 1 leaves the straightening device 100.

The straightening device 100 is characterized in that it is adjustable in two degrees of freedom d, F. Preferably, this adjustability is chosen or designed so that adjustability is reproducible, i. at any time on the basis of specifications exactly comprehensible.

The various embodiments of the invention may also have more or fewer rollers than shown in the figures.

In the following, embodiments will be described, all of which are of the kind described in US Pat Fig. 2 derived principle derived were. However, the technical teaching of these embodiments can also be based on the principle of Fig. 1 transfer.

The straightening device 100 preferably comprises a base plate 101, on or on which an upper roller plate 130 and a lower roller plate 140 are arranged. The roles of the two roller plates 130, 140 are each arranged in the initial state parallel to an ideal cable axis (which is parallel to the transport direction X) of a cable 1. The rollers preferably have a circumferential (circumferential) groove in the middle. In Fig. 4A For example, the groove 123.1 of the roller 123 is indicated by an arrow.

It should be noted that in the FIGS. 3 to 9B only those roles are provided with reference numerals, to which reference is currently made in the description. The number of rollers can, as already mentioned, vary depending on the embodiment. The assignment of the rollers to the input-side roller assembly 110 and the output-side roller assembly 120 refers to at least the first two or three input-side rollers 111, 112, 113 and the last two or three output-side rollers 121, 122, 123.

The rollers are preferably arranged offset from each other in all embodiments. It may, for example, an overhead roller 111, then an underlying underlying roller 112 and then again follow an obliquely above overhead roller 113, etc .. Preferably, the number of underlying rollers 112, 124, 123 by a number smaller than the number the overhead rollers 111, 113, 121, 122 (eg above four rollers and below three rollers, as in the Figures 1 and 2 ), or vice versa (eg above four rollers and below five rollers, as in Figures 3A to 3C).

The upper roller plate 130 is preferably guided with a guide 102 perpendicular to the cable axis (transport direction X) on the base plate 101, as in the sectional view in Fig. 4B can be seen. It is preferably pressed with a spring 103 in the open state (ie up here). A quick-release lever 104 with eccentric 104.1 or a corresponding automatically operated eccentric serve to quickly open and close the upper roller plate 130. As "opening" is referred to a relative movement, which causes the distance between the upper roller plate 130 and the lower roller plate 140 increases becomes. The term "closure" refers to a reverse relative movement. The rollers of the respective roller plate 130, 140 move in solidarity with the "opening" and "closing".

The quick release lever 104, the eccentric 104.1 and the upper roller plate 130, for example, with a dial or an adjusting screw 144 via a spindle 144.1 (see Fig. 4B ) moved perpendicular to the cable axis (transport direction X).

The lower roller plate 140 is rotatable about a peripheral axis 141. This axis 141 is preferably close to the axis of rotation R1 of the last roller 123 of the output side roller assembly 120. The closer the axle 141 is to the rotational axis R1 of the last roller 123, the less the distance d of the last two rollers 122, 123 changes when a slight rotational movement of the lower roller plate 140 about the axis 141 takes place.

In a particularly preferred embodiment, the axis 141 and the axis of rotation R1 of the last roller 123 coincide. In this case, the distance d does not change when the lower roller plate 140 makes a slight rotational movement about the axis 141.

The mentioned rotational movement about the axis 141 is carried out in order to specify a force F on the input side, such as in FIG Fig. 2 or Fig. 5 can be seen.

For example, a pneumatic cylinder 142 may be used to pull the roller plate 140 upwardly. Thus, the lower roller plate 140 is inclined relative to the upper roller plate 130 by the aforementioned rotational movement about the axis 141 and the rollers press the input side on the cable 1, which is pulled by the straightening device 100. Thus, the device 100 causes in the transport direction X (pulling direction) of the cable 1 from the first roller 111 to the last roller 122 decreasing directivity. If the cylinder 142 acts in the opposite direction, the lower roller plate 140 is moved to a stop 143 in the starting position parallel to the upper roller plate 130.
The pneumatic cylinder 142 is preferably driven by the wire processing machine or straightener 100 via a valve. The pressure of the cylinder 142 and thus also the force F is adjusted for example via a pressure regulator.

The following explains the principle of operation.

1. 1. Offen, wenn die beiden Rollenplatten 130 und 140 so eingestellt sind, dass keine der Rollen das Kabel 1 berührt (siehe Fig. 5).
2. 2. Geschlossen, wenn die Rollenplatten 130 und 140 parallel ausgerichtet sind und die Rollen das Kabel 1 berühren (siehe Fig. 6).
3. 3. Aktiv, wenn die Rollenplatten 130 und 140 auf der Seite der ersten Rolle 111 (d.h. auf der Eingangsseite) mit einer Kraft F gegeneinander gedrückt werden, so dass das Kabel 1 beim Hindurchlaufen gerichtet wird (siehe Fig. 7).

The straightening device 100 has three positions:

1. 1. Open, when the two roller plates 130 and 140 are adjusted so that none of the rollers touches the cable 1 (see Fig. 5 ).
2. 2. Closed when the roller plates 130 and 140 are aligned in parallel and the rollers contact the cable 1 (see Fig. 6 ).
3. 3. Active, when the roller plates 130 and 140 on the side of the first roller 111 (ie on the input side) are pressed against each other with a force F, so that the cable 1 is directed while passing (see Fig. 7 ).

The cable processing machine or straightening device 100 preferably provides the two roller plates 130, 140 in parallel via the pneumatic cylinder 142. The operator or a controller opens the straightener 100 with the quick release lever 104 and lays the cable 1. Then the operator or a controller closes
the straightening device 100 with the quick release lever 104 and, for example, with the adjustment screw 144, the upper roller plate 130 so that all the rollers of the device 100, the cable 1 exactly touch (see Fig. 6 ). The operator or a controller can recognize this, for example, from the fact that the cable 1 begins to bend. Alternatively or additionally, the cable 1 can be moved back and forth during closing until the rollers rotate with the cable 1. Thus, the moment can be recognized that the closed position 2. (see Fig. 6 ) corresponds.

The operator or controller uses a pressure regulator to adjust the pressure of the pneumatic cylinder 142 based on specifications (e.g., a lookup table or information from a storage medium) for the clamped cable 1. The pressure of the pneumatic cylinder 142 corresponds to a force F, as described.

Before the cable processing machine or straightener 100 transports the cable 1 in the transporting direction X, the pneumatic cylinder 142 is brought to the upper position (called the active position), whereby the straightening device 100 is active and the cable 1 is reciprocally and in the cable transporting direction X from the first roller 111 is bent to the last roller 122 decreasing from the upper and lower rollers. The cable 1 is now directed in pulling the straightening device 100 in a defined manner.

When the cable 1 is stopped again after straightening, the cable processing machine or straightening device 100 can move the roller plates 130, 140 apart again and set parallel (called open position), so that the cable 1 is relieved and can be removed.

The embodiments described so far can be modified as follows.

The axis of rotation 141 of the roller plate 140 can take a different position as needed, as already indicated. When the rotation axis 141 of the lower roller plate 140 coincides with the rotational axis R1 of the last roller 123, the last roller 123 contacts the cable 1 at each angular position or rotational position of the lower roller plate 140, provided that in step 2 the closed position approached / set. This principle can be applied to any embodiment.

Even if slight misadjustment of the upper roller plate 130 is to ensure that the last roller 123 does not bend the cable 1, the rotation shaft 141 can be placed below the roller axis R1 of the roller 123.

The upper roller plate 130 may be provided with a rotation axis analogous to the lower roller plate 140, which coincides with the roller axis of the last roller 125 of the upper roller plate 130 or in the vicinity of this roller 125 in Fig. 3A, with the advantage that the Cable 1 is loaded symmetrically at the entrance of the straightening device 100. This principle can be applied to any embodiment.

For the upper roller plate 130, an adjustment aid is preferably provided, as explained below. If the outer diameter of the cable 1 is known, the upper roller plate 130 can be brought to a defined position, for example with a scale which is labeled for different cable dimensions or with a sensor, the distance between the two roller plates 130, 140 to each other measures. As a sensor, a position sensor or distance sensor can be used. The adjustment aid allows the transition from the open to the closed position, as in Fig. 6 shown to make it more reproducible. This principle can be applied to any embodiment.

Depending on the embodiment, a force sensor 145 may be provided, as in FIG Fig. 8 shown. It can be installed a force sensor 145, with which it can be measured whether the cable 1, the rollers, respectively, the rollers touch the cable 1. For example, a force sensor 145 may measure contact via a metering roller 105 and a counter-roller 106. The rollers 105 and 106 preferably contact the cable 1 in line with the other rollers of the respective roller plate 130, 140. This principle applies to any embodiment.

Depending on the embodiment, a position sensor may be provided. A corresponding roller 107.1 may be mounted on a lever 108 which is rotatably mounted on the roller plate 130 via an axle 108.1. The lever 108 is pressed with a spring 108.2 or with gravity in the direction of an opposing roller 107.2. By the contact with the cable 1, the roller 107.1 is moved in the line of the other rollers of the upper roller plate 130. A sensor mounted on the roller plate 130 (e.g., a forked light barrier 109) gives a signal when the roller 107.1 contacting the cable 1 is in line with the other rollers of the upper roller plate 130 and thus all the rollers contact the cable 1. This principle can be applied to any embodiment.

Instead of a sensor (eg a fork light barrier 109) or in addition, a mark can also be attached to the upper roller plate 130, which indicates the correct position of the lever 108 during manual adjustment.

This principle can be applied to any embodiment.

Preferably, a return of sensor data is used in the straightening device 100. In this way a closed-loop or active control loop can be set up. The sensor signals of the force or position sensor may be used for this purpose e.g. in a machine control of the straightening device 100 and / or the cable processing machine, which monitors the measured values and in case of incorrect settings e.g. warns the user and blocks cable processing. This principle can be applied to any embodiment.

Preferably, in each embodiment, a feed mechanism of the upper roller plate 130 is used. The upper roller plate 130 is preferably moved by a motor, e.g. with a motor 131 with spindle 132. The motor drive can be coupled with one of the mentioned sensors (eg 145 and / or 109) to automatically drive to the optimum position where both the distance d and the force F are the specifications correspond.

The feed force or the pressure which is responsible for the application of the force F can also be applied to the lower roller plate 140 in each embodiment, or a partial force is applied to both roller plates 130, 140.

Instead of a manual pressure regulator can be used in each embodiment, a pressure regulating valve, which is controlled by the cable processing machine or the straightening device 100 in order to specify the force F. The cable processing machine or the straightening device 100 can lead a table (eg in a storage medium) in which the respective optimum force F, respectively the respective adjustment of the pressure regulating valve or the Cylinder of the device 100, is deposited. The pressure setting in this case is fully automatic as soon as the cable type of the wire processing machine or the straightening device 100 is known.

In each embodiment, the force F can also be varied during cable transport in order to make the cable 1 stronger or weaker at different sections.

• Einfach einzustellende Parameter, die ein optimales (manuelles oder automatisches) Einstellen ermöglichen;
• Der Parameter, der die Kraft F definiert ist insensitiv, d.h. auch mit einer leichten Abweichung von der optimalen Krafteinstellung (durch Fehleinstellung, Fertigungstoleranzen oder abweichende Materialeigenschaften) weicht die Richtwirkung der Richtvorrichtung 100 nicht stark vom Optimum ab;
• Der Parameter Rollenabstand d am Ausgang kann objektiv und sehr einfach aus den geometrischen Daten des Richtgutes (des Kabels 1) hergeleitet werden. Eine Fehleinstellung ist daher unwahrscheinlich.
• Beide Parameter F und d sind objektiv mess- und einstellbar (manuell oder automatisch);
• Die beiden Parameter F und d sind unabhängig von einer bestimmten Kabelbearbeitungsmaschine oder einer bestimmten Richtvorrichtung 100. Die Einstelldaten können somit einmalig definiert und zusammen mit dem Kabeltyp (z.B. in einem Speichermedium) hinterlegt werden. Diese Einstelldaten können zu einem beliebigen Zeitpunkt auf einer beliebigen Kabelbearbeitungsmaschine oder Richtvorrichtung 100 mit reproduzierbarer Wirkung angewendet werden.
• Es ist möglich, die eingangsseitige Kraft F in bestimmten Betriebszuständen kontrolliert zu reduzieren, beispielsweise bei stillstehendem Kabel 1, um eine unerwünschte Deformationen im Kabel 1 zu vermeiden oder bei hoher Geschwindigkeit, um die notwendige Antriebsleistung im Kabelvorschub zu reduzieren. Das Kabel 1 wird trotzdem gut zwischen den Rollen der Richtvorrichtung 100 geführt.
• Eine erfindungsgemässe Richtvorrichtung 100 kann trotz dieser Vorteile kostengünstig konstruiert und gebaut werden und es können bestehende Kabelbearbeitungsmaschinen einfach nachgerüstet werden.
• Gemäss Erfindung befinden sich besonders die eingangsseitigen Rollen der Richtvorrichtung 100, die die grösste Richtwirkung entfalten, stets in einer idealen Position.

The invention offers a number of advantages which have already been described or suggested. Above all, the straightening device 100 offers the following advantages:

• Easy-to-set parameters that allow optimal (manual or automatic) adjustment;
• The parameter which defines the force F is insensitive, ie even with a slight deviation from the optimum force setting (due to misadjustment, manufacturing tolerances or deviating material properties), the directivity of the straightening device 100 does not deviate greatly from the optimum;
• The parameter roller distance d at the output can be derived objectively and very simply from the geometric data of the straightening material (cable 1). A misadjustment is therefore unlikely.
• Both parameters F and d are objectively measurable and adjustable (manual or automatic);
• The two parameters F and d are independent of a particular cable processing machine or a particular straightening device 100. The setting data can thus be defined once and stored together with the cable type (eg in a storage medium). These adjustment data can be applied at any time on any cable processing machine or straightening device 100 with reproducible effect.
• It is possible to control the input-side force F controlled in certain operating conditions, for example, with a stationary cable 1 to a To avoid unwanted deformations in the cable 1 or at high speed to reduce the necessary drive power in the cable feed. The cable 1 is still performed well between the rollers of the straightening device 100.
• An inventive straightening device 100 can be constructed and constructed inexpensively despite these advantages and existing cable processing machines can be easily retrofitted.
• According to the invention, the input-side rollers of the straightening device 100, which exhibit the greatest directivity, are always in an ideal position.

Claims (8)

1. Straightening device (100) for straightening cables (1), comprising an inlet-side roller arrangement (110) and an outlet-side roller arrangement (120), which are so arranged that a cable (1) to be straightened passes, as considered in transport direction (X), through between rollers (111, 112, 113) of the inlet-side roller arrangement (110) in the straightening direction (100) and after passing through between rollers (121, 122, 123, 124) of the outlet-side roller arrangement (120) leaves the straightening device (110), wherein

   - a part of the rollers (111, 113) of the inlet-side roller arrangement (110) and a part of the rollers (121, 122) of the outlet-side roller arrangement (120) are arranged, as considered in transport direction (X), one behind the other at a first common roller plate (130),

   - another part of the rollers (112) of the inlet-side roller arrangement (110) and another part of the rollers (123, 124) of the outlet-side roller arrangement (120) are arranged, as considered in transport direction (X), one behind the other at a second common roller plate (140), and

   - a spacing (d) between two rollers (122, 123) of the outlet-side roller arrangement (120) is settable,

   characterised in that in a closed state the roller plates (130, 140) are oriented to be parallel and the rollers (111, 112, 113, 122, 123) contact the cable (1) and that a force (F) acting between two rollers (111, 112) of the inlet-side roller arrangement (110) perpendicularly to the transport direction (X) on the cable (1) is presettable in that a cylinder (142) of the first common roller plate (130) is pivoted with respect to the second common roller plate (140).
2. Straightening device (100) according to claim 1, characterised in that the first common roller plate (130) is adjustable in controlled manner with respect to the second common roller plate (40) so as to be able to set the spacing (d).
3. Straightening device (100) according to one of claims 1 and 2, characterised in that the roller plates (130, 140) are mounted on a common base plate (101) to be movable relative to one another.
4. Straightening device (100) according to any one of claims 1, 2 and 3, characterised in that they comprise a quick-action clamping lever (104) designed so that the spacing (d) and/or the force (F) is or are settable by manual actuation.
5. Straightening device (100) according to any one of claims 1, 2 and 3, characterised in that it has a pivot axis (141) which is arranged in the region of a roller (123) of the outlet-side roller arrangement (120) and is designed so that the second common roller plate (140) can be pivoted with respect to the first common roller plate (130) about this pivot axis (141) so as to be able to set the force (F).
6. Straightening device (100) according to any one of claims 1 to 5, characterised in that it comprises at least one of the following components:

   - a force sensor (145) which is so arranged that it can be measured whether the rollers contact the cable (1); and

   - a sensor (109) which is so arranged that it can be determined whether one of the rollers contacts the cable (1).
7. Cable processing machine with a straightening device (100) according to any one of claims 1 to 6.
8. Method of operating a straightening device (100) according to any one of claims 1 to 7, characterised in that the following steps are carried out:

   - introducing a cable (1) to be straightened into an intermediate space between rollers (111, 112, 113) of the inlet-side roller arrangement (110) and rollers (121, 122, 123, 124) of the outlet-side roller arrangement (120);

   - executing a relative adjusting movement in order to bring all rollers (111, 112, 113) of the inlet-side roller arrangement (110) and all rollers (121, 122, 123, 124) of the outlet-side roller arrangement (120) uniformly into contact with the cable (1); and

   - executing a rotational movement of a part of the rollers (112, 123, 124) so as to exert an increased pressure on the cable (1) between the rollers (111, 112, 113) of the inlet-side roller arrangement (110).

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