EP0313769B1 - Method and apparatus for the intermittent straightening of wires - Google Patents

Abstract

The intermittent straightening of the wire (1) is carried out by means of a fixedly supported straightening rotor (4), the straightening blocks (5, 6, 7) of which radially deflect the wire (1) advanced by conveying mechanism (2). The mass moment of inertia of the straightening rotor (4) is dimensioned to be so small that the straightening rotor (4) can be decelerated and accelerated at least approximately within the same time period as the wire (1) by the conveying mechanism (2). For cutting to length, the straightening rotor (4) is braked in synchronism with the wire (1) and thereafter again accelerated. Thereby, a perfect wire quality is achieved, in particular a uniform elongation approximately constant over the entire length of the wire, without having to move the cutting device at the high wire feeding speed, or without having to move the straightening rotor axially or the straightening blocks radially, in order to avoid heating up and damaging of the arrested wire by the further operating straightening rotor. Different straightening rotors (4) are utilized for different wire types, these rotors being easily exchangeable with their bearings (46).

Description

The invention relates to a method for the intermittent straightening of wire according to the preamble of patent claim 1 and a device for carrying out the method according to the preamble of patent claim 7.

Methods of this type are to be distinguished from those in which the wire is advanced with an undelayed feed rate even during the operation following the straightening, in particular a cutting operation following the straightening, and therefore the operating means performing the operation following the straightening, e.g. B. a cutting device for cutting the wire must be moved with the high feed rate with the wire. This z. B. from US-A-1 703 885 known methods have the advantage that the problem of heating and damage (burning, embrittlement, inhomogeneous material strength) of the stationary wire in the rotating straightening rotor does not arise, but the disadvantage that with the high wire feed speed with moving operating means, e.g. B. the so-called "flying scissors" cutting device is structurally complex and expensive. A method of that other type, in which the wire does not continue intermittently, but also continues during the subsequent operation at an unchanged high feed speed, also relates to JP-A-58 122 139. The wire straightening device known therefrom has several conveyor roller groups for advancing the wire, adjustable shaping rollers , a straightening rotor with a cylindrical housing in which three straightening blocks are arranged, and a wire scanning device which checks the straightness of the straightened wire. An adjusting device for the radial adjustment of the straightening blocks is arranged in the housing of the straightening rotor, which can be connected via a coupling to a motor which can be displaced by a displacement device when the straightening rotor is in a certain rotational position. The wire feed speed and the angular speed of the straightening rotor are controlled by a control device based on the wire diameter and the wire material calculated and set. The straightening rotor can optionally be connected (obviously via a one-way clutch) to an electric motor producing the angular speed for straightening and a stepping motor for rotating the rotor into the rotary position for setting the straightening blocks, the stepping motor being controlled by the control device after the straightening rotor has been stopped Electric motor has leaked. Straightening is only interrupted if a new wire with different properties is to be used, which requires a different setting of the straightening blocks.

The generic method is also to be distinguished from those methods of another type, in which the wire is stopped during the operation, in particular the cutting process, and the straightening rotor is moved in the axial direction (longitudinal direction of the wire) with the wire stopped, in order to prevent excessive flexing work at one point and thus prevent the wire from becoming brittle or burning. A method and an apparatus of that other type is known from US-A 2 172 134. The straightening rotor is mounted on a carriage that can be moved back and forth on a pair of rods and is driven via a coupling. The carriage is moved forward with the rotating straightening rotor when the wire is fed and backwards with the rotating straightening rotor when the wire is stationary and clamped by a gripper for cutting. At the end of the backward movement, the carriage hits a stop, whereby the coupling is disengaged and the straightening rotor runs out. After the wire has been cut to length, the grippers are opened and the carriage is moved forward again, the clutch being engaged and the piece of wire previously directed when the carriage runs backwards runs through the grippers.

The complex and error-prone, very fast movement of the surgical means, e.g. B. the so-called flying shears, and moving the straightening rotor in the wire direction (in the direction of the straightening rotor axis) is omitted in the generic method known from CH-A-475 806. The wire is cut at a standstill and the straightening stones of the rotating straightening rotor are moved hydraulically or pneumatically during the time of the wire standstill in such a way that the flexing work is reduced and thus the wire becomes brittle and burned out. However, the radial adjustment of the straightening stones of the rotating straightening rotor is also complex and prone to failure.

The invention has for its object to provide a method and a device of the type mentioned that work simple, trouble-free and with a high production rate and ensure a perfect, homogeneous, uniform wire quality over the entire length of the wire (strength, uniform elongation, etc.).

The achievement of this object according to the invention is the object of claim 1 in terms of the method and the subject of claim 7 in terms of the device.

Due to the synchronous deceleration of the rotation of the straightening rotor and the wire feed before the operation and the synchronous acceleration after the operation, a perfect wire quality is achieved over the entire length of the wire: the material properties of the wire are changed homogeneously by the straightening in the longitudinal direction of the wire and the straightened wire maintains in particular an approximately constant strength and uniform elongation over its entire length, that is to say in particular that with the first delayed and then again accelerated feed through the wire section, which was likewise decelerated and then again accelerated, attains the same or at least almost the same strength and uniform expansion as the rest of the wire, which runs at constant feed speed through the wire rotating at constant angular speed.

With the invention, the disadvantages accepted in the prior art of the very rapid movement of the operating means in the longitudinal direction of the wire (US-A-1 703 885), the reciprocating movement of the straightening rotor in the direction of the rotor axis when the wire is at a standstill (US-A-2 172 134) or the radial displacement of the straightening stones when the wire passage was exposed (CH-A-475 806) in order to reduce the heating and damage of the stopped wire by the continuing straightening rotor. These disadvantages were accepted in the state of the art, because the experts had previously believed (cf. e.g. CH-A-475 806) that the straightening rotor was braked when the wire passage was suspended due to the high forces involved and the high degree of wear and tear, the massive execution of the straightening rotor and the straightening stones (cf. the straightening rotors shown in the above-mentioned publications as well as in US-A-1 594 570 and US-A-2 965 150) is still economically within an intermittent straightening process reasonable time not feasible.

The new way of synchronously decelerating and accelerating the straightening rotor with the wire, which is followed by the invention, is made possible in terms of the device in that the mass moment of inertia of the straightening rotor is dimensioned so small that it at least approximately at the same time as the wire with the funding can be delayed and accelerated. This device-related teaching, which is surprising with regard to the prior art, is preferably carried out with the features of claims 9-16.

The method according to the invention can basically be carried out in the two following embodiments. In the first embodiment, the wire is decelerated or braked to a reduced feed rate and the straightening rotor to a reduced angular rate, and in the reduced feed rate the operating means, in particular the cutting device, are moved synchronously with the wire. After cutting to length, the wire and straightening rotor are accelerated again and the operating means or the cutting device moves back to its starting position in order to be ready for the next cut. In the second embodiment, the wire is decelerated to a complete standstill and the straightening rotor either also to a complete standstill or to such a low angular velocity that the quality of the wire is not impaired. In this case, the operation following the straightening or the cutting to length takes place when the wire is at a standstill with fixedly arranged or mounted operating means or a fixedly arranged cutting device.

Both types of design have their optimal fields of application. The first embodiment is structurally more complex than the second, but enables higher production rates. For the first embodiment, a cutting device can be used which is designed in the manner of the cutting device known from US-A-1 703 885 (so-called "flying scissors"), the construction effort and the susceptibility to faults being significantly lower due to the delayed wire feed speed.

Both types of design can be optimally adapted to the cycle times of subsequent and preceding machine groups.

Fig. 1

eine Draufsicht auf einen Teil einer Drahtricht- und -schneidmaschine,

Fig. 2

eine Seitenansicht des Richtrotors der Maschine von Fig. 1,

Fig. 3

einen Längsschnitt durch den Richtrotor entlang der Linie III-III in Fig. 1,

Fig. 4

einen Querschnitt durch den Richtrotor entlang der Linie IV-IV in Fig. 1,

Fig. 5

eine Draufsicht auf einen der Richtsteine des Richtrotors,

Fig. 6

einen Längsschnitt durch den Richtstein,

Fig. 7

eine Stirnansicht des Richtsteins,

Fig. 8

eine schematische Darstellung der Steuereinrichtung und der Antriebsmittel der Maschine von Fig. 1, und

Fig. 9

ein schematisches Diagramm der Drahtvorschubgeschwindigkeit und der Winkelgeschwindigkeit des Richtrotors in Abhängigkeit von der Zeit.

The invention will be explained in more detail with reference to the accompanying drawings, which represent only an exemplary embodiment. Show it:

Fig. 1

a plan view of part of a wire straightening and cutting machine,

Fig. 2

2 shows a side view of the straightening rotor of the machine from FIG. 1,

Fig. 3

2 shows a longitudinal section through the straightening rotor along the line III-III in FIG. 1,

Fig. 4

2 shows a cross section through the straightening rotor along the line IV-IV in FIG. 1,

Fig. 5

a plan view of one of the straightening stones of the straightening rotor,

Fig. 6

a longitudinal section through the straightening stone,

Fig. 7

a front view of the topping stone,

Fig. 8

a schematic representation of the control device and the drive means of the machine of Fig. 1, and

Fig. 9

a schematic diagram of the wire feed speed and the angular speed of the straightening rotor as a function of time.

The device for straightening and cutting wire 1 has two pairs of rollers 2 for accelerating, uniformly moving and braking the wire 1, a stationary cutting device 10 for cutting the wire 1 at a standstill, and a guide tube 3 in front of and behind a straightening rotor 4 with a rotor body 8 In the rotor body 8 there are three straightening stones 5, 6, 7, each with a counterweight 44 and two grub screws 40, 41, as well as a guide bushing 9 in front of and behind the three straightening stones 5, 6, 7. The rotor body 8 is a one-piece component with three parallelepiped-shaped sections 11, 12, 13 and two circular-cylindrical regions 15 lying between these sections 11, 12, 13, as well as one circular-cylindrical shoulder 16, 17 for mounting and one hollow-cylindrical piece 18, 19 each for fixing a guide bushing 9 The axes of the circular cylindrical shoulders 16, 17, the hollow cylindrical pieces 18, 19, the two circular cylindrical regions 15 and d the diagonal intersections of the end faces of the cuboid sections 11, 12, 13 lie on the geometric axis of rotation 25 of the straightening rotor 4. The axis of rotation 25 is also the axis of a cylinder bore 21 located in the rotor body 8, the diameter of which determines the stability of the entire straightening rotor 4 Wall thickness of the circular cylindrical regions 15 is given. The outer diameter of the circular-cylindrical regions 15 is as large as the small side of the end face 34, 35 of the cuboid section 11, 12, 13. Vertical to the small side of the cuboid section 11, 12, 13 are three cutouts 22, 23, 24 with clearance fits for the straightening stones 5, 6, 7 arranged. The described configuration of the rotor body 8 is selected so that a minimal moment of inertia is achieved.

The wire 1 to be straightened, conveyed by the roller pairs 2 in the direction of the arrow 14, enters the straightening rotor 4 in the axis of rotation 25 on the front face 27, is held by the guide bush 9 in the hollow cylindrical piece 18 in the axis of rotation 25 and by the straightening stones 5, 6, 7, and leaves the straightening rotor 4 again at its rear end face 28 through the guide bushing 9 in the hollow cylindrical piece 19.

The straightening stones 5, 6, 7 have a flat, closed underside 29 and a groove 31 which is open towards the top 30 of the straightening stones 5, 6, 7. The groove 31 runs in the middle of the top 30 of the straightening stones 5, 6, 7 and is in their width by a tolerance larger than the wire diameter. The depth of the groove 31 is so great in its non-widened part that it completely receives the wire to be straightened. The two side walls 33 and the end faces 34, 35 run vertically upward from the flat underside 29. To the front end face 34, the groove 31 is expanded in a funnel shape to approximately twice the width of the original groove size, whereas the rear outlet has only an extension of approximately 20% and approximately ten percent of the total length of the alignment stone 5; 6, 7 is. The depth of the non-widened groove 31 is approximately 40% of the height of the straightening stones 5, 6, 7. As a result, the mass moment of inertia of the rotor is only increased insignificantly by the straightening stones. The straightening stone 5, 6, 7 has the same height over its entire length. The width of the rear end face 35 is two thirds of the front end face 34. The front 34 and the rear end face 35 are parallel to one another and perpendicular to the axis of the groove 31 Spout has the straightening stone 5, 6, 7 on the top 30 a circular bulge 38, the diameter of which is approximately ten percent smaller than the width of the front end face 34, and which extends along the two long sides 33 to the bottom 29. The circular bulge 38 in the straightening stone 5, 6, 7 is located in the force application point of the deflected wire 1. The diameter of the bulge 38 is chosen so large that the bulge 38 on the one hand due to the clearance fit with thread 43 for the grub screws 40, 41 in the cutout 22, 23, 24 slips, and on the other hand, the smooth, closed bottom 39 of the grub screw 40 receives a good contact surface 42. As with the straightening rotor 4, attention has also been paid to minimum weight in the straightening stone 5, 6, 7. Therefore, the side walls 33 in the area of the upper edge of the groove 31 outside the bulge 38 are only a fraction, preferably a third, of the groove 31 wide.

The position of the cutouts 22, 23, 24 for the straightening stones 5, 6, 7, and the guide bushes 9, as well as their dimensions, depend on the mechanical data of the wire 1 to be straightened. The cutouts 22, 23, 24 are matched fits for the Straightening stones 5, 6, 7 are formed and have a thread 43 in the part which receives the bulge 38 of the straightening stones 5, 6, 7. Two setscrews 40, 41 above and below the straightening stone 5, 6, 7 in the thread 43 the stone 5, 6, 7 held in place. The front and rear straightening stones 5 and 7 deflect the wire 1 in one direction out of the axis of rotation 25, while the middle straightening stone 6 deflects it in the opposite direction. The grooves 31 of the straightening stones 5, 6, 7 are open in the direction of their displacement from the axis of rotation 25, the straightening stones 5, 7 in the same radial direction and the straightening stone 6 opposite Axis are offset. By displacing the straightening stones 5, 6, 7, the flexing work of the wire 1 necessary for straightening during the rotation of the straightening rotor 4 and the associated relaxation of the wire material is achieved. Since the straightening stones 5 and 7 are offset in one direction and the straightening stone 6 in the opposite direction to the axis 25, a uniform mass distribution can be achieved by the straightening stone 6 being arranged further away from the axis 25 than the straightening stones 5 and 7 . A slight imbalance that may arise as a result of uneven wear or as a result of another arrangement of the straightening stones due to special wire properties can be compensated for by a counterweight 44 located in the thread 43 of the cutouts 23. The mutual distance between the straightening stones 5, 6, 7 is smaller than their own length. The outside diameter of the parts of the straightening rotor 4, which do not hold any straightening stones 5, 6, 7, is reduced to the extent necessary solely for mechanical stability in order to reduce the total moment of inertia. Openings between the straightening stones 5, 6, 7, as are provided in known straightening rotors for removing broken wire, have been deliberately avoided. If the wire breaks, the entire straightening rotor 4 can easily be replaced.

The straightening rotor 4, with its straightening stones 5, 6, 7 and guide bushes 9, is optimized for a wire diameter or wire type and can be exchanged as a whole unit in its bearing 46.

The grub screws 40, 41 are used to adjust the straightening stone 5, 6, 7 for optimal directivity in the wire 1. The wire 1 coming from a wire supply (not shown), usually a wire reel, becomes 1 accelerated to feed speed for straightening and cutting to length by the two pairs of rollers 2, and pushed into the straightening rotor 4 through the guide tube 3 arranged coaxially to the wire 1 and passed to the cutting device 10 through a further guide tube 3 connected downstream of the straightening rotor 4.

When threading the wire 1 into the straightening rotor 4, it is guided via the front guide sleeve 9 to the front funnel 36 of the first straightening stone 5. The deflection of the wire 1 to the next straightening stone 6, 7 or the guide sleeve 9 in the vicinity of the rear end face 35 of the straightening rotor 4 is achieved by the smooth bottom 39 of the grub screw 40. The following straightening stones 6 and 7 are each threaded through the front funnel 36 of the straightening stones 6, 7 concerned. In operation, the wire 1 only runs over the groove bottom 47 of the straightening stones 5, 6, 7.

The large front funnel 36 of each straightening stone 5, 6, 7 is mainly required only during the wire threading, while the smaller rear funnel 35 and the part of the front funnel 36 directly adjoining the force application point guide the wire in the groove 31 during operation.

As shown in FIG. 8, the straightening rotor 4 is driven by a DC motor 51 via a toothed belt 50 which meshes with the hollow cylindrical piece 18 of the front end part 27 of the rotor 4 which is designed as a toothed belt wheel 48. The upper rollers or wheels of the roller pairs 2 are connected to one another by a toothed belt 52 and, together via a toothed belt 54, are likewise driven by the DC motor 51. Two toothed belt pulleys 56, 57 of different diameters are seated on the output shaft of the DC motor 51, with which the toothed belts 50, 54 mesh, the transmission ratios being dimensioned such that the straightening rotor 4 rotates at a greater angular speed than the roller pairs 2. The DC motor 51 is fed by a servo amplifier 58 with a controller (PID proportional controller) controlled by a control device 60 (NC or CNC control), which controls the current on the basis of the set values delivered in a time sequence by the control device 60 and those of a tachometer 62 Measured actual values of the angular velocity of the output shaft of the motor 51 controls and regulates. The respectively advanced wire length is determined by the control device 60 by means of an incremental encoder (incremental rotary encoder) 64 arranged on the output shaft of the motor 51. (The actual value of the angular velocity can also be determined using the increment encoder 64, the tachometer 62 being omitted).

Due to the above-mentioned construction of the straightening rotor 4 with the straightening stones 5, 6, 7 and guide bushes 9, the total mass moment of inertia of the straightening rotor 4 which is effective during rotation is so small that it decelerates in the same time as the wire 1 with the pairs of rollers 2. and is accelerable. The cutting device 10 and the drive means 48-58 of the roller pairs 2 and the straightening rotor 4 are controlled by the control device 60 in such a way that the roller pairs 2 and the straightening rotor 4 are decelerated synchronously with one another until they come to a standstill and then accelerated synchronously with one another before the cutting device 10 is activated are, whereby due to the common drive of the straightening rotor 4 and the roller pairs 2 (with different translation), the angular speed of the straightening rotor 4 is increased or decreased in proportion to the feed speed of the wire 1.

The working cycle for straightening and cutting the wire 1, which is controlled by the control device 60 and regulated by the controller, consists of three phases, which are explained in more detail below with reference to FIG. 9, the ratio of the angular speed of the straightening rotor 4 to the feed speed of the wire generated by the drive rollers 2 1 is constant because of the common drive. The ratio can be changed for different wire types by replacing the toothed belt pulleys, or, in deviation from FIG. 8, two independent drive devices can be provided for driving the straightening rotor 4 and the drive rollers 2, the controllers of which are controlled jointly by the control device 60, so that the Ratio can be set by the control device depending on the wire type or possibly also depending on the speed.

In the first phase beginning at t 1, the wire 1 and the straightening rotor 4 are accelerated from standstill to a predetermined feed and angular velocity v 1, w 1, the angular velocity w of the straightening rotor 4 being increased synchronously and proportionally to the feed velocity v. In the subsequent second phase beginning at t₂, the wire 1 and straightening rotor 4 are moved at a constant speed v₁, w₁, and in the third phase starting at t₃, the wire 1 and straightening rotor 4 are retarded by decelerating the speed of the motor 51 to braked to a standstill, the motor 51 operating as a braking device controlled and regulated by the control device 60 and the regulator, and the angular speed of the straightening rotor 4 being reduced synchronously and in proportion to the feed speed of the wire 1 in accordance with the first phase. After the wire 1 comes to a standstill at t₄, the driver 65 of the fixedly arranged cutting device 10 is removed from the Control device 60 controlled and the wire 1 cut to length, whereupon the next cycle begins with the first phase of the synchronous acceleration of straightening rotor 4 and wire 1.

The feed speed v 1 can be, for example, 2-5 m / sec and the angular speed w 1 can be selected so that the straightening rotor executes one revolution at a wire feed of 5 to 25 mm, so the angular speed w 1 z. B. is 12,000 revolutions per minute. In the embodiment shown in the drawing, the acceleration time t₂-t₁ = 0.1-0.2 sec required in the first phase for the acceleration of the straightening rotor 4 from standstill to w 1 = 12,000 rpm. Correspondingly small, that is, only one to two tenths of a second was the delay time t₄-t₃ for the delay of the straightening rotor 4 (and the wire 1) from the angular velocity w₁ to standstill. The extremely short acceleration and deceleration time is achieved thanks to the extremely low mass moment of inertia of the straightening rotor 4, which is achieved by the above-mentioned construction and which is two orders of magnitude (approximately a hundred times) smaller than that of conventional straightening rotors.

With extremely short working cycles in the tenths of a second, resp. very short (in the centimeter range) pieces of wire to be cut to length, the second phase of the even movement can be omitted, ie wire 1 and straightening rotor 4 can be accelerated and decelerated immediately in succession. If the wire straightening and cutting machine upstream or downstream machines or machine groups in a production line have a longer work cycle, a waiting cycle can be connected to the cutting of the wire 1, after which the first movement phase is continued again.

Instead of cutting to length, other operations are also possible, such as e.g. B. bending the wire, welding a cross wire u. the like

Instead of the two pairs of rollers 2 in front of the straightening rotor 4 for pushing in the wire 1, a pair of rollers 2 can also be arranged in front of and one behind the straightening rotor 4, or there can also be only pairs of rollers which pull the wire 1 through the rotor 4. The arrangement to be selected depends on the wire data and the required straightening qualities. In general, however, pull rolls 2 behind the straightening rotor 4 deteriorate the straightening quality of the wire 1.

The straightening rotor (and possibly also the conveying means) can also be driven hydraulically instead of by an electric motor, wherein the hydraulic fluid can simultaneously be used to cool the rotor.

As a variant, the grub screw 41 acting on the underside 29 of the alignment stone 5, 6, 7 can be replaced by a spring arranged in the cutout.

Several interchangeable straightening rotors 4 are provided for ongoing operation. The straightening rotor 4 is taken as a whole with its two bearings from the two bearing brackets 46, which are fixed with two screws each. Each of the straightening rotors 4 is tailored to the relevant wire type to be straightened by appropriate dimensioning of the straightening stones and guide bushes 9 and their position in the straightening rotor 4.

Instead of braking the movement of the wire 1 and the rotational speed of the straightening rotor 8 to a standstill in the third movement phase, it is also possible to use reduced speed can be continued, and the wire 1 can be cut off with a cutting device which is also moved in the feed direction of the wire. Compared to conventional methods that cut to the full speed, the optimum speed for the respective cutting device can be cut here. The advantage of this variant compared to the above-described cutting to a standstill is the higher achievable number of cut wire sections per unit of time. Since the cutting device is only moved at the reduced feed speed, the acceleration problems of the cutting device ("flying shears") which occur in the conventional methods are eliminated.

Claims (15)

1. Method for the intermittent straightening of wire (1), wherein the wire (1) is accelerated to a feeding velocity, is radially deflected by a group of straightening blocks (5, 6, 7) of a stationarily disposed straightening rotor (4) which rotates at an angular velocity and is decelerated for a subsequent operation in each case, characterised in that the rotation of the straightening rotor (4) is decelerated synchronously with the wire feed before operation and subsequently is accelerated again.
2. Method according to claim 1, characterised in that the wire (1) is decelerated to a reduced feeding velocity and the straightening rotor (4) is decelerated synchronously to a reduced angular velocity and the operation means for performing the following operation, in particular a cutting device (10) for cutting the wire (1) to length, are moved with the wire (1) at the reduced feeding velocity and after the cutting to length are moved back to the initial position.
3. Method according to claim 1, wherein the wire (1) is decelerated to a standstill for the following operation, in particular for cutting to length, and the following operation is performed while the wire is stationary by means of stationary operating means, in particular a stationary cutting device (10), characterised in that the rotation of the straightening rotor (4) is decelerated synchronously with the wire feed at least approximately until standstill.
4. Method according to any one of claims 1 to 3, characterised in that the wire (1) is guided in front and behind the group of straightening blocks (5, 6, 7) through at least one guide (9), in each case, in the direction of the rotational axis (25) of the straightening blocks (5, 6, 7).
5. Method according to any one of claims 1 to 4, characterised in that the angular velocity of the straightening rotor (4) is increased and reduced, respectively, in a manner at least approximately proportional to the feeding velocity of the wire (1).
6. Method according to any one of claims 1 to 5, characterised in that the sum of the times for acceleration, for a uniform feed, for decelerating the wire (1) and of a time between deceleration and reacceleration of the wire (1) during which the operation is performed, or the wire is cut, is adjusted to suit the production timing of previous or following machines.
7. Device for performing the method according to claim 1, with a straightening rotor (4) which is stationarily disposed and comprises a group of straightening blocks (5, 6, 7), delivery means (2) for feeding the wire (1), a drive means (48 to 58) for driving the straightening rotor (4) and the delivery means (2) and operational means (10) for performing an operation on the wire after it has been straightened, characterised in that the inertia moment of the straightening rotor (4) is so small such that the straightening rotor (4) can be decelerated and accelerated by the delivery means (2) at least approximately within the same time as the wire (1), such that the delivery means (2) and the straightening rotor (4) can be accelerated and decelerated by a common drive means (48 to 58) and that a control means (60) is provided which controls the operational means (10) and the drive means (48 to 58) in such a manner that, before controlling the operational means (10) in each case, the delivery means (2) and the straightening rotor (4) are decelerated synchronously with respect to one another and subsequently are accelerated synchronously with respect to one another.
8. Device according to claim 7, characterised in that the straightening rotor (4) has in front of and behind the group of straightening blocks (5, 6, 7) at least one exchangeable guide sleeve (9) in each case.
9. Device according to claim 7 or 8, characterised in that the straightening rotor (4) forms with its straightening blocks (5, 6, 7), guide sleeves (9) and bearing (46) an exchangeable construction unit.
10. Device according to claim 9, characterised by a set of exchangeable straightening rotors (4) which are associated with different wire diameters or wire types in each case, and of which the dimensions, mutual distances of the straightening blocks (5, 6, 7), position and size of balancing weights (44) and of the guide sleeves (9) are different corresponding to the wire diameters or wire types with which they are associated.
11. Device according to any one of claims 7 to 10, characterised by a set of straightening rotors (4) which can be exchanged with or without their bearing, wherein the distances between the straightening blocks (5, 6, 7) are smaller than their length and are dimensioned such that they achieve an optimum straightening effect without there being any space for openings between the straightening blocks (5, 6, 7) designed for removing broken or trapped wire(s) (1) by means of tools.
12. Device according to any one of claims 7 to 11, characterised in that the straightening rotor (4) comprises only three straightening blocks (5, 6, 7) and two guide sleeves (9) between which the three straightening blocks (5, 6, 7) are disposed.
13. Device according to any one of claims 7 to 12, characterised in that the straightening rotor (4) has at each wire deflecting point only one straightening stone (5, 6, 7), the sliding surface (31) of which faces away from the axis of rotation (25), with a groove (31) the depth of which corresponds to at least the wire diameter, and the radial position of each straightening stone (5, 6, 7) is fixed by two headless screws (40, 41) or one headless screw (40) and a resilient element, wherein the end of the headless screw (40) or of the resilient element which faces the sliding surface (31) has a smooth end surface.
14. Device according to claim 13, characterised in that each straightening stone (5, 6, 7) sits in a radial recess (22, 23, 24), of the straightening rotor (4), with inside thread in a form-locking manner with adjusted clearance, comprises on both sides of its guide groove (31) at the point where the force of the deflected wire (1) acts in each case one bulge (38) which has at least approximately the shape of a circular segment and sits with adjusted clearance in the inside thread (43) into which the headless screw or screws (40, 41) is/are screwed, and has an end face (34), which widens with respect to the bulges (38), at the wire inlet end in which the guide groove (31) widens in a U-shaped manner in the direction towards the end face (34).
15. Device according to claim 14, characterised in that the depth and the width of the guide groove (31) of each straightening stone (5, 6, 7) is larger than the wire diameter by a tolerance and the thickness of the two side walls (33) of the guide groove (31) at their free longitudinal edges outside the bulge (38) is only a fraction of the width of the guide groove (31), preferably only one third thereof.

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