COILBOX AND METHOD FOR OPERATION THEREOF

Description

[0001] The invention relates to a coil box for winding a metal strip into a coil and for unwinding the metal strip from the coil. The term "coil" refers in particular to a wound metal strip. The invention further relates to a system consisting of the coil box according to the invention and a coil processed therein. Finally, the invention relates to a method for operating the coil box.

[0002] Coil boxes are generally known in the prior art. They typically consist of a winding station and an unwinding station located downstream of the winding station in the direction of material flow. The winding station and unwinding station each consist of a plurality of adjustable rollers. Within the coil box, the coil, which has been completely wound in the winding station, must be transferred to the downstream unwinding station. Two basic solutions for this coil transfer are known in the prior art: active coil transfer and passive coil transfer.

[0003] To implement active coil transfer, additional hydraulic actuators are typically required in the area between the winding station and the unwinding station. These are not only cost-intensive but also require additional space between the winding station and the unwinding station. In addition, commissioning is considerable because the movements of the actuators must be precisely coordinated with the rollers of the upstream winding station and the downstream unwinding station to ensure smooth coil transport. The technical complexity of the system is therefore very high for active coil transfer. Examples of active coil transfer can be found in European patents EP 2 257 395 B1 and EP 2 616 196 B2. The advantage of active coil transfer is that the location orThe position of the coil within the coil box, and especially during transfer from the winding station to the unwinding station, is clearly defined at all times. With active coil transfer, a new coil to be wound can therefore enter the winding station as soon as the current position of the last wound coil indicates that it has safely left the winding station or reached the unwinding station. In this way, high production rates can be achieved with active coil transfer.

[0004] The so-called passive coil transfer, also known in the state of the art, does not offer these advantages. However, it is much more cost-effective to implement because it requires no additional plant technology. In passive coil transfer, the coil is pulled from the winding station to the unwinding station by the tensile force of the finishing train downstream of the coil box when the coil has become so light that the coil's weight is no longer sufficient to transfer the torque of the unwinding rollers to the coil to bend the metal strip. Unwinding of the coil ends when its rotational movement ceases. Depending on the material, temperature, and geometry of the metal strip, passive coil transfer will always only begin when a calculable coil weight is reached.However, it can happen that the coil is not completely pulled onto the unwinding station, but remains temporarily between the rollers of the take-up station and the rollers of the unwinding station. This occurs more frequently with soft material, i.e. at high temperatures and with thin metal strip. The position of the coil cannot therefore always be determined precisely during passive coil transfer; in particular, it remains unclear whether the coil is still between the two stations or already in the unwinding station. However, a new metal strip to be wound up can only be released for entry into the coil box's take-up station if it is ensured that the coil box's take-up station is completely empty.However, since the position of the coil is unclear during passive coil transfer, especially during the transfer from the coiling station to the uncoiling station, and the coil's position can only be definitively determined in the uncoiling station, passive coil transfer results in a loss of time in determining when the coil has definitively left the coiling station. This results in reduced productivity of the system, because the subsequent metal strip to be wound can only be released for entry into the coil box's winding station once the previously wound coil has definitively left the winding station.

[0005] Japanese patent application JP 2000 005818 A discloses a coil box according to the preamble of claim 1.

[0006] The invention is based on the object of developing a known coil box, a known system consisting of the coil box and a coil, as well as a known method for operating the coil box, such that the position of the coil is known at all times, particularly during its passive transfer from the winding station to the unwinding station, and therefore the time at which the coil leaves the winding station within the coil box can be definitively determined.

[0007] This object is achieved with regard to the coil box by the subject matter of claim 1.This object is characterized in that at least one additional roller is provided which is rotatably mounted on the frame, in that the axis of rotation of the additional roller is parallel to the axes of rotation of the first to fourth rollers, and in that the axis of rotation of the additional roller is positioned on the frame in such a way that its radial distance xz from the pivot point of the frame is greater than the radial distance x2 from the pivot point of the second roller to the pivot point of the frame, and in that its radial distance xz plus the radius of the additional roller is smaller than the minimum radial distance x3 from the pivot point of the third roller to the pivot point of the frame, less the radius of the third roller, and in that the uppermost point of the additional roller is arranged at a predetermined distance w below this roller table plane in a first transition position in which the uppermost points of the first and second rollers form a horizontal roller table plane.This protects the additional roll, and possibly the next additional roll, at least somewhat from the heat radiation emitted by the coil, which is usually still warm. This is sensible, perhaps even necessary, because during this phase there is no additional strip contact that would remove additional heat from the rolled stock.

[0008] The additional roll according to the invention offers the advantage that the position of the coil during its transfer from the winding station to the unwinding station and the time at which the coil leaves the winding station can be determined better and more precisely. This results in the advantage that the production rate can be increased compared to the conventional passive transfer because the winding of the subsequent strip can begin earlier. Further explanations of this will be provided in the description of the exemplary embodiments.

[0009] According to one embodiment, the transfer of the coil from the winding station to the unwinding station can advantageously be facilitated by providing at least one displacement device for optionally and individually displacing the third and / or fourth roll, which form the unwinding station, below the roller table plane E1 formed by the first and second roll in a first transition position.

[0010] According to a further embodiment, a further additional roller is rotatably mounted on the frame between the second roller and the additional roller. This further additional roller is positioned on the frame in such a way that its outer circumference projects beyond a fictitious tangential connecting line - facing the roller table plane E1 - between the outer circumferences of the second roller and the additional roller. By providing the further additional roller, the position of the coil and the time at which it leaves the winding station can be determined even more accurately. Furthermore, the further additional roller offers the advantage that the transfer of the coil from the first via the second to the third transition position is kinematically smoother because the further additional roller pre-positions the coil even before the additional roller engages the coil.

[0011] Advantageously, the coil box according to the invention further comprises a position detector for generating a position indicator representing the position of the additional roller, particularly when the additional roller is raised to or above the height of the roller table level formed by the first roller and the second roller in the first transition situation. Advantageously, the position of the additional roller also represents the position of the coil during the coil transfer.

[0012] The above-mentioned object of the invention is further achieved by a system according to claim 9, which comprises the coil box according to the invention and a coil wound therein. Finally, the object is further achieved by the method according to claim 11. The advantages of these two solutions correspond to the advantages mentioned above with reference to the claimed coil box. Advantageous embodiments of the coil box, the system, and the claimed method are the subject of the dependent claims.

[0013] The description includes a total of 8 figures, of which Figure 1 shows the coil box according to the invention, consisting of a winding station and an unwinding station in a first transition position; Figure 2 shows the coil box according to the invention with the winding station in a second transition position; Figure 3 shows the coil box with the winding station in a third transition position; Figure 4 shows the coil box according to the invention with the winding station in a transfer position; and Figures 5-8 show the Figures 1 to 4 correspond, with the only difference that now another additional roll is arranged between the second roll of the winding station and the additional roll shows.

[0014] The invention will be described in detail below with reference to the figures mentioned in the form of exemplary embodiments. In all figures, identical technical elements are designated by identical reference numerals.

[0015] Figure 1shows the coil box 100 according to the invention. It consists of a winding station 110 for winding a metal strip into a coil and an unwinding station 120. The winding station 110 and the unwinding station 120 each consist of a plurality of rollers for transporting the metal strip in the transport direction R. In the winding station, a first roller 111, a second roller 112, and, as a special feature according to the invention, an additional roller 116 are provided, all of which are rotatably mounted on a common frame 114. The frame 114 with said rollers is pivotally mounted by an angle of rotation α about a pivot point D. A rotary drive 125 is provided for pivoting the frame 114. The term "rotary drive" also includes a translationally acting lifting cylinder with which the rotary or pivoting movement can also be realized.

[0016] The unwinding station 120 consists of at least a third roller 123 and a fourth roller 124, which can be individually displaced at least in the vertical direction, i.e. in terms of their height. The vertical displacement or the height difference can be varied at any time using a displacement device 130 or can be set once using so-called intermediate plates and then remain unchanged in this position, or can be structurally fixed and fixed. The design using intermediate plates offers the advantage that fewer adjustment functions are required. With a horizontal alignment of the first roller 111, the second roller 112, the third roller 123 and the fourth roller 124, all four of these rollers form a horizontal roller table plane E1 in their basic or starting position. They are arranged one behind the other in the transport direction R. The axes of rotation of all rollers, including the additional roller 116, are arranged parallel to one another.The additional roller 116 provided according to the invention is arranged on the frame 114 such that its radial distance xz from the pivot point D of the frame 114 is greater than the radial distance x2 of the pivot point of the second roller 112 from the pivot point D of the frame. Furthermore, the radial distance xz of the additional roller 116 plus the radius of the additional roller is smaller than the minimum radial distance x3 of the pivot point of the third roller 123 from the pivot point D of the frame 114, minus at least the radius ' of the third roller 123. In particular, a collision with the roller 3 must be / be excluded by design. Finally, the uppermost point of the additional roller 116 is in a first in . Figure 1shown transition position P1 of the frame 114 and the rollers arranged thereon, in which the uppermost points of the first and second rollers form the said horizontal roller table plane E1, arranged at a predetermined distance w below this roller table plane E1. Between the second roller 112 and the additional roller 116, a further additional roller 115 can also be rotatably mounted on the frame 114. The further additional roller 115 is then positioned on the frame 114 in such a way that its outer circumference projects beyond a fictitious tangential connecting line V - facing the roller table plane - between the outer circumferences of the second roller 112 and the additional roller 116.

[0017] The diameters of the additional roller 116 and the further additional roller 115 are smaller than the diameters of the first to fourth rollers, for example 2 / 3 or ½.

[0018] Furthermore, the coil box according to the invention can have a position detector 140 for generating a position signal representing the position of the additional roller, in particular when the additional roller 116 is raised to the height of the horizontal roller table plane E1 formed by the first roller 111 and the second roller 112 in the first transition position P1 or above. The position sensor 140 can also be configured to detect the position of the frame 114, wherein the position of the additional roller can then be determined via a kinematic relationship. In this exemplary embodiment, the detected position of the frame is representative of the position of the additional roller.

[0019] At the beginning of the winding station 110, there is typically a forming area with inlet rollers for guiding the new metal strip entering the coil box, and with bending rollers and a forming roller for forming the beginning of the new metal strip into a coil eye for a coil to be rewound in the winding station. However, the forming area of ​​the winding station 110 is not the subject of the present invention and is therefore not shown in the figures. In the forming area of ​​the winding station, the incoming metal strip is wound into the coil 20 and initially deposited on the first roller 111 and the second roller 112 of the winding station 110, wherein the first and second rollers are aligned horizontally and form the horizontal roller table plane E1. In the context of the present invention, this position is referred to as the starting position for these two rollers.by briefly pivoting the frame 114 clockwise, the coil is moved from its depositing position on the first two rollers 111 and 112 into the position shown in . Figure 1 shown first transition position P1. In this first transition position P1, the coil 20 is carried solely by the second roller 112 of the winding station 110 and the third roller 123 of the unwinding station 120. As soon as the coil 20 has reached this first transition position P1, the frame 114 is pivoted back to its starting position, as shown in Figure 1shown. Alternatively or in addition to the brief pivoting of the frame 114 clockwise and counterclockwise, the coil can also be pulled into the first transition position P1 by applying a tensile force to the free end of the metal strip wound into the coil. The tension on the free end of the metal strip in the transport direction R can be applied, for example, by a rolling stand downstream of the coil box when the free end of the metal strip wound into the coil is clamped into the roll gap of the rolling stand. The rolling stand is not shown in the attached figures.

[0020] The aim of the method according to the invention for operating the coil box is to transfer the wound coil 20 within the coil box 100 from the winding station 110 via several transition positions P1, P2 and P3 and a transfer position P4 in the transport direction R into the winding station 120.

[0021] In the Figure 1In the first transfer position shown, the coil 20 is carried solely by the second roller 112 and the third roller 123. To transfer the coil 20 into the unwinding station 120, in a first method step, the frame 114 is pivoted counterclockwise by an angle αP2 only to the extent that the additional roller 116 rests against the outer circumference of the coil 20.

[0022] This denotes the second transition position P2 as in Figure 2shown. In this situation, it is important that the distance xzp projected into the horizontal plane between the rotation axis in the additional roller 116 and the pivot point of the frame 114 is smaller than the distance xcp projected into the horizontal plane between the center of gravity of the coil 20 and the rotation axis D of the frame 114. The said relationship between the distances xcp and xzp ensures that the coil 20 is not only lifted during a subsequent further pivoting or rotation of the frame 114 in the counterclockwise direction, but also further in the transport direction R into the Figure 3 shown third transition position is transferred.

[0023] In this third transition position, the coil is only carried by the additional roller 116 and the third roller 123. However, the rotational axis of the additional roller 116 is still located below a fictitious connecting line between the point D of the frame 114 and the center axis of the coil 20. Only when the frame 114 is pivoted a little further counterclockwise, so that the rotational axis of the additional roller 116 is located on the connecting line between the rotational axis D of the frame and the center of the coil eye, does the coil 20 have the Figure 4 The coil 20 is now in a quasi-stable equilibrium state because its center of gravity is exactly above the center of rotation of the third roller 123. Further transport of the coil 20 into the Figure 4The target position indicated by dashed lines, in which the coil 20 lies stably on the third roller 123 and the fourth roller 124 of the unwinding station 120, can no longer be reached by further pivoting the frame 114. Instead, the coil is moved from the unstable equilibrium state into the stable support on the rollers 123 and 124 by applying a strip tension to the free end of the coil wound into the metal strip in the transport direction R. In the transfer position P4, the coil 20 may not be lowered with the lowest point on its outer circumference by more than a predetermined permissible maximum distance A max below the upper edge of the third roller 123. This is the prerequisite for the said pulling of the coil 20 into the stable equilibrium position, as in Figure 4shown in dashed lines, can be realized solely by strip tension. To facilitate the transition of the coil 20 from the transfer position P4 to the stable support on the third and fourth rollers 123, 124, the fourth roller 124 can be lowered relative to the horizontal plane E1, as in Figure 4 shown.

[0024] Figures 5 to 8 show a second embodiment according to the present invention, wherein in addition to the additional roller 116, a further additional roller 115 is rotatably mounted on the frame 114. The exact positioning of the further additional roller 115 on the frame has already been described above. Figures 5 to 8 show analogous to the Figures 1 to 4 the different transition positions P1, P2 and P3, which the coil 20 must pass through before it reaches the transfer position P4, which is Figure 8for the second exemplary embodiment. The transition positions P1, P2, and P3, as well as the transfer position P4, are achieved in particular by the frame 114 being pivoted increasingly further counterclockwise. In the transfer position P4, in particular the second roller 112, but also the further auxiliary roller 115 and the auxiliary roller 116, reach their respective upper end points. For the second roller 112, this is marked Top2. This applies both to the first exemplary embodiment without an additional auxiliary roller and to the second exemplary embodiment with the additional auxiliary roller.

[0025] In the first transition position P1 according to Figure 5It can be seen that the coil 20 is initially carried solely by the second roller 112 and the third roller 123. Both the additional roller 115 and the additional roller 116 are still arranged below the coil 20 without contacting it. Only during the transition from the first transition position to the second transition position according to Figure 6 By pivoting the frame 114 with the rollers arranged thereon counterclockwise, in addition to the second and third rollers, the additional roller 115 also comes into contact with the outer circumference of the coil 20. Here too, it is important, analogous to the description of the Figure 2that the distance xcp projected into the horizontal plane between the center of the coil 20 and the rotation axis D of the frame 114 is greater than the distance xwzp projected into the horizontal plane between the rotation axis of the additional roll brought into contact and the pivot point D of the frame 114. The reasoning for this distance criterion is the same as in the description of Figure 2 explained, namely that when the frame 114 is pivoted further, the coil 20 must not only be lifted, but must also experience a force component in the transport direction R.

[0026] During the transition from the second transition position P2 to the third transition position P3 by further pivoting the frame 114 counterclockwise, the coil 20 is detached from the second roller 112 and instead the additional roller 116 is further applied to the coil 20. The coil 20 is now supported by the further additional roller 115, the additional roller 116 and the third roller 123; see Figure 7 .

[0027] By further pivoting the frame 114 counterclockwise around the rotation axis D, the coil 20 is pushed or shifted further in the transport direction R and thus reaches the transfer position P4; see Figure 8In this transfer position P4, the coil 20 has detached itself from the additional roller 115 and now rests only on the additional roller 116 and the third roller 123. In this transfer position, the coil 20 is in a precarious equilibrium situation. All rollers on the frame 114 have each reached their upper end position; for the second roller 112, this is also designated here with the reference symbol Top2. In the transfer position P4, the additional roller 116 lies with its center point on a fictitious connecting line between the pivot point D of the frame 114 and the center of the coil 20. Ideally, if the position TOP2 permits, the upper end position is used for limiting if necessary.In this exemplary embodiment, the coil 20 can also be transferred from the unstable equilibrium position into a stable equilibrium position either by pulling on the free end of the belt in the transport direction R and / or by lowering the third roller 123 below the plane E1, wherein the coil 20 then rests on the third roller 123 and the fourth roller 124 of the unwinding station 120. The movement of both the third roller 123 and the fourth roller 124, in particular in the vertical direction, can be realized by the displacement device 130, which acts on the rollers, or in another way, as described above in the context of the description of . Figure 1 explained. Lowering the fourth roller 124, possibly by a fixed amount, facilitates both the deposition of the coil in the unwinding station and the forwarding of the unwound metal strip to a subsequent processing facility, e.g., a rolling mill.

[0028] For both exemplary embodiments, a position detector can be provided for generating a position signal that signals that at least one of the rollers 111, 112, 115, 116 rotatably mounted on the frame 114 has reached the transfer position P4 and thus its respective upper end position Top2. According to the invention, this position signal is used as a confirmation signal that the coil has safely left the winding station. According to the invention, the entry of a new metal strip into the forming area of ​​the coil box 100 for forming a new coil is only permitted in response to the thus generated confirmation signal.By providing the additional roller 116 and possibly the further additional roller 115 according to the invention, the basically passive coil transport on which the invention is based is enhanced in such a way that the position of the coil during the transition between the winding station 110 and the unwinding station 120 can now be reliably detected at any time by providing the additional roller according to the invention, in particular by detecting the positions of the additional roller 116 and / or the further additional roller 115 with the aim of increasing the productivity of a coil box with purely passive coil displacement without further active actuators. List of reference symbols

[0029] 100Coil box 110Rewinding station 111First roll 112Second roll 114Frame 115Further additional roll 116Additional roll 120Unwinding station 123Third roll 124Fourth roll 125Rotary drive 130Displacement device 140Position detector 20Coil αRotation angle of the frame αP2Rotation angle of the frame in position P2 A max maximum distance D pivot point E1 horizontal roller table level P1 first transition position P2 second transition position P3 third transition position P4 transfer position R material flow direction = transport direction of the coil TOP2 highest position of the second roll V fictitious connecting line w predetermined distance r2 radius of roll 116 r3 radius of roll 123 xcp projected distance xzp projected distance x2 radial distance x3 radial distance xz radial distance

Claims

1. Coilbox (100) comprising: a winding-up station (110) for winding up a metal strip to form a coil (20), wherein the winding-up station is formed from a plurality of rollers of which a first roller (111) and a second roller (112) are rotatably mounted at a common frame (114), a rotary drive (125) for pivoting the frame (114) together with the first and second rollers through an angle α of rotation about a fulcrum (D) in the region of the first roller (111) between a winding-up position, in which the metal strip is wound to form the coil (20), via a plurality of transition positions (P1, P2, P3) which the coil wound up to finished state transits, to a transfer position (P4) for transfer of the coil (20) to an unwinding station (120); and the unwinding station (120) which is formed by at least one third roller (123) and fourth roller (124) and in which the metal strip can be unwound from the coil (20), wherein the unwinding station (120) is downstream of the winding-up station (110) in material flow direction (R); and wherein the second roller (112) is downstream of the first roller (111) and the fourth roller (124) is downstream of the third roller (123) in material flow direction (R) and the axes of rotation of all rollers are oriented parallelly to one another; characterised in that at least one auxiliary roller (116) rotatably mounted on the frame (114) is provided; the axis of rotation of the auxiliary roller lies parallel to the axes of rotation of the first to fourth rollers; and the axis of rotation of the auxiliary roller (116) is so positioned relative to the frame (114) that - its radial spacing xz from the fulcrum (D) of the frame (114) is greater than the radial spacing x2 of the fulcrum of the second roller from the fulcrum of the frame; and - its radial spacing xz plus the radius of the auxiliary roller (116) is smaller than the minimum radial spacing x3 of the fulcrum of the third roller (123) from the fulcrum (D) of the frame (114) less at least the radius of the third roller; and - the uppermost point of the auxiliary roller in a first transition position (P1) in which the uppermost points of the first and second rollers form a horizontal roller path plane (E1) is arranged at a predetermined spacing w below this roller path plane (E1).

2. Coilbox (100) according to claim 1, characterised in that the second roller (112) has reached its upper end position (TOP2) in the transfer position (P4).

3. Coilbox (100) according to one of the preceding claims, characterised in that the diameter of the auxiliary roller (116) is smaller than the diameter of the first, second third or fourth roller.

4. Coilbox (100) according to any one of the preceding claims, characterised in that at least one displacing device (130) is provided for optional individual displacement of the third and / or fourth roller (123, 124) under the roller path plane (E1) formed by the first and second rollers (111, 112).

5. Coilbox (100) according to any one of the preceding claims, characterised by a further auxiliary roller (115), which is also rotatably mounted on the frame, between the second roller (112) and the auxiliary roller (116), wherein the further auxiliary roller is positioned at the frame (114) in such a way that it projects by its outer circumference above a notional tangential connecting line (V), which faces the roller path plane (E1), between the outer circumferences of the second roller (112) and the auxiliary roller (116).

6. Coilbox (100) according to any one of the preceding claims, characterised by a position detector (140) for producing a position signal which represents the position of the auxiliary roller (116), particularly when the auxiliary roller is elevated to the height of the roller path plane (E1), which is formed by the first roller (111) and the second roller (112) in the first transition position (P1), or thereabove.

7. Coilbox (100) according to any one of the preceding claims, characterised by a shaping region, which is arranged at the start of the winding-up station (110), with entry rollers for guidance of new metal strip entering the coilbox and with bending rollers and a shaping roller for shaping the start of the new metal strip to form a coil eye for a new coil to be wound up in the winding-up station.

8. Coilbox (100) according to any one of the preceding claims, characterised in that during winding up of the metal strip to form a new coil in the winding-up station the frame (114) with the help of the rotary drive (125) is pivoted into a winding-up position in which the first and the second rollers form an oblique plane inclined towards the shaping region.

9. System comprising the coilbox (100) according to any one of the preceding claims and a coil (20), characterised in that the auxiliary roller (116) and, if present, also the further auxiliary roller (115) are further rotatably mounted on the frame (114) in such a way that when the frame is pivoted out of the first transition position (P1) through a rotation angle αP2 into a second transition position (P2), in which the auxiliary roller (116) or the second auxiliary roller (115) contacts for the first time the coil (20) carried by the second and third rollers (112, 123), the spacing xzP or xwzP which is projected into the horizontal, between the axis of rotation of the auxiliary roller (116) or the further auxiliary roller (115) and the fulcrum of the frame (114) is smaller than the spacing xcp, which is projected in the horizontal, between the fulcrum of the coil and fulcrum (D) of the frame (114).

10. System according to claim 9, characterised in that if the frame is pivoted beyond the third transition position (P3) into the transfer position (P4) and the coil (20) is supported only by the third roller (123) and the auxiliary roller (116) the coil (20) by the deepest point at its outer circumference is lowered by not more than a predetermined permissible maximum spacing (Amax) below the upper edge of the third roller (123).

11. Method of operating a coilbox (100) according to any one of claims 1 to 8, comprising the following method steps: winding up the metal strip to form a coil (20) in the winding-up station of the coilbox; transferring the wound-up coil (20) via a plurality of transition positions (P1, P2, P3) within the winding-up station (110) to the unwinding station (120), which is downstream in material flow direction (R), of the coilbox (100) by application of a tensile force to the start of the metal strip wound-up to form the coil and by raising at least the second roller (112) of the winding-up station to a transfer position (P4) by pivotation about the fulcrum (D) of the frame: characterised in that for attainment of the transfer position (P4) the frame together with the first and second rollers rotatably mounted thereon as well as the auxiliary roller (116) and in a given case the further auxiliary roller (115) is pivoted about the fulcrum (D) of the frame (114) to such an extent that the auxiliary roller (116) or the further auxiliary roller (115) is raised above the horizontal roller path plane (E1) formed by the first roller (111) and the second roller (112) in the first transition position (P1); and the coil (20) in the transfer position (P4) and supported only by the third roller (123) and the auxiliary roller (116) is disposed in a quasi-unstable equilibrium.

12. Method according to claim 11, characterised in that a position signal is generated when one of the rollers at the frame (114), particularly the auxiliary roller (116) is raised above the horizontal roller path plane (E1), which is formed by the first roller (111) and the second roller (112) in the starting position thereof and in the transfer position (P4) has reached its respective upper end position (Top2) and this position signal is used as a confirmation signal that the coil (20) has securely left the winding-up station (110).

13. Method according to claim 12, characterised in that a new metal strip is admitted to the shaping region of the coilbox (100) for formation of a new coil only in response to the generated confirmation signal.

14. Method according to any one of claims 11 to 13, characterised in that a tensile force is applied to the start of the metal strip wound up to form the coil (20) and / or the third roller (123) opposite the roller path plane (E1) is lowered for transfer of the coil from the transfer position (P4) in the unwinding station (12), where the coil is stably borne on the third and fourth rollers (123, 124).

15. Method according to claim 14, characterised in that the tensile force is applied by a roll stand, which is downstream of the unwinding station (120) in material flow direction, for rolling of the metal strip.