CAROUSEL REEL FACILITY

Abstract

 An object is to provide a carousel reel facility capable of, even when a strip to be cut is transported at high speed, stably guiding a trailing edge of the cut strip to a take-up drum. To achieve the object, a tip of a guide frame (31) is caused to be attachably and detachably in contact with a snubber roller (25) which presses against the circumferential surface of a strip (S) taken up at a take-up completion position, while following an increase in a coil diameter of the strip (S). The guide frame (31) thus swings in accordance with a coil diameter following operation of the snubber roller (25). In addition, when the snubber roller (25) performs the coil diameter following operation in accordance with an increase in the coil diameter, a rod (37a) of an elevating/lowering cylinder (37) is maintained at an extended state, and a link member (35), a link bar (36), and the elevating/lowering cylinder (37) operate as a link mechanism.

Description

TECHNICAL FIELD

[0001] The present invention relates to a carousel reel facility capable of continuously taking up a transported strip by alternately switching take-up positions of two rotatable take-up drums revolving with a carousel reel.

BACKGROUND ART

[0002] Generally, a cold-rolled strip of soft steel, high-tensile steel, or the like is rolled in a single pass by continuous tandem rolling in order to achieve high efficiency and high yield. In the continuous tandem rolling, a preceding strip and a following strip each unwound from a coil of a hot rolled strip are connected together to form a continuous strip. Then, this strip is continuously fed to a continuous tandem rolling mill to perform cold rolling. Thereafter, the strip is sequentially passed through rolling stands of the continuous tandem rolling mill to be rolled to a target thickness. Subsequently, the rolled strip is again taken up in a coil shape on the delivery side of the continuous tandem rolling mill, where the connecting portion of the preceding strip and the following strip is cut.

[0003] Accordingly, the continuous tandem rolling mill is provided, on the delivery side, with a take-up facility which is capable of continuously taking up the cut preceding strip and following strip in a coil shape. Of various take-up facilities, one in which two rotatable take-up drums revolve with a carousel reel (called a carousel reel facility below) is recently widely used from the viewpoint of productivity and reduction of facility cost.

[0004] As shown in Fig. 6, in such carousel reel facility, a first take-up drum 22 which is disposed at a take-up start position on an upstream side starts to take up a preceding strip Sf. Then, a carousel reel 21 is revolved during the taking-up to move the first take-up drum 22 to a take-up completion position on a downstream side and a second take-up drum 23 to the take-up start position. A trailing edge of the preceding strip Sf is cut by cutting blades 121a, 121b of respective drum shears 12a, 12b in this state. Then, a leading edge of a following strip Sb is taken-up by the second take-up drum 23. By thus switching the take-up positions of the two take-up drums 22, 23, the rolling process can be continuously performed without stopping.

[0005] Meanwhile, the carousel reel facility has been conventionally provided on a delivery side of a continuous finishing facility and of an acid pickling facility. For example, Patent Documents 1 and 2 each disclose a carousel reel facility applied to a continuous finishing facility. In these carousel reel facilities, a take-up start position where a take-up drum starts to take up a strip is set to be lower than an installed position of a deflector roller used to change a direction of the transported strip. In other words, the take-up start position is set to be lower than a pass line of the transported strip.

PRIOR ART DOCUMENTS

PATENT DOCUMENTS

[0006] 

Patent Document 1: Japanese Examined Patent Application Publication No. Hei 7-8381

Patent Document 2: Japanese Examined Patent Application Publication No. Hei 7-106384

SUMMARY OF THE INVENTION

PROBLEMS TO BE SOLVED BY THE INVENTION

[0007] On the other hand, in the carousel reel facility provided on the delivery side of the continuous tandem rolling mill for cold rolling as described above, as shown in Fig. 6, the take-up start position where the take-up drums 22, 23 start taking up the strip is set to substantially the same height as the installed position of the deflector roller 13 so that the carousel reel facility can handle high-speed, high-tensile, and hard materials. In other words, the take-up start position is set to substantially the same height as the pass line of the transported strip S. Accordingly, even if the strip S is transported fast, the strip S is taken up by the take-up drum 22, 23 disposed at the take-up start position without overshooting the take-up drum 22, 23 due to its own inertial force.

[0008] In other words, when the carousel reel facility applied to the continuous finishing facility or the like is used on the delivery side of the continuous tandem rolling mill for cold rolling, the following problem occurs. Since the take-up start position is set lower than the installed position of the deflector roller and the transport speed of the strip is high, the strip reaches the take-up start position by its own weight, but may overshoot the take-up drum and may not be taken up by the take-up drum properly.

[0009] Moreover, in the conventional carousel reel facility for cold rolling as shown in Fig. 6, when the strip S is cut by the drum shears 12a, 12b, a trailing edge of the strip S (strip Sf or Sb) taken up by the take-up drum 22, 23 disposed at the take-up completion position is released from tension to be in a non-restrained state. Thus, the strip S may flutter and come into contact with peripheral devices, or may be bent.

[0010] In order to solve such problems, the transport speed of the strip S during cutting has to be set to, for example, 250 m/min or lower in the conventional carousel reel facility for cold rolling. However, recently, faster high-tensile cold rolling is to be achieved. Accordingly, with the configuration of the conventional carousel reel facility for cold rolling, it is difficult to restrain the behavior of the trailing edge of the cut strip S and appropriately guide it to the take-up drum 22, 23 disposed at the take-up completion position.

[0011] The present invention aims to solve the above problems, and has an object to provide a carousel reel facility capable of, even when a strip to be cut is transported at high speed, stably guiding a trailing edge of the cut strip to a take-up drum.

MEANS FOR SOLVING THE PROBLEMS

[0012] A first aspect of the present invention provides a carousel reel facility in which
a disk-shaped revolvable carousel reel is provided with two rotatable take-up drums disposed at respective positions symmetric to each other with respect to a rotation axis of the carousel reel,
one of the take-up drums which is disposed on an upstream side starts to take up a preceding strip,
during the taking-up, the carousel reel is revolved to move the one take-up drum to a downstream side and the other take-up drum to the upstream side, and
in this state, a trailing edge of the preceding strip is cut, and a leading edge of a following strip is taken up by the other take-up drum, the carousel reel facility characterized by comprising:

a deflector roller provided on an entry side of the carousel reel at a position almost as high as the take-up drum disposed on the upstream side, the deflector roller guiding the transported strip to any of the take-up drums disposed on the upstream side and the downstream side;

pressing means that presses against a circumferential surface of the strip taken up by the take-up drum disposed on the downstream side, while following an increase in a coil diameter of the strip and thus prevents fluttering of the trailing edge of the cut strip;

guiding means supported in such a manner as to be swingable about a rotation shaft of the deflector roller, the guiding means guiding the trailing edge of the cut strip to the take-up drum disposed on the downstream side while having a tip of the guiding means work in accordance with a coil diameter following operation of the pressing means;

swinging means that causes the guide means to swing so that the guide means dose not interfere with the take-up drums moved by the revolution of the carousel reel; and

swing allowing means that allows the guiding means to swing in accordance with the coil diameter following operation of the pressing means without operating the swinging means.

[0013] A second aspect of the present invention provides a carousel reel facility characterized in that a transport speed of the strip during the cutting is set to 250 m/min or higher.

[0014] A third aspect of the present invention provides a carousel reel facility characterized in that
the guiding means includes a magnet for attracting the strip by magnetic force and a roller protruding out relative to an attracting surface of the magnet, and
attraction by the magnet is performed when a transport speed of the strip during the cutting exceeds 300 m/min.

EFFECT OF THE INVENTION

[0015] According to the carousel reel facility of the present invention, even when the strip to be cut is transported at high speed, the trailing edge of the cut strip can be stably guided to the take-up drum. Accordingly, there is no need to reduce the transport speed of the strip more than necessary during the cutting. Thus, productivity and quality of the strip can be improved.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 

[Fig. 1] Fig. 1 is a schematic configuration diagram of a carousel reel facility according to one embodiment of the present invention.

[Fig. 2] Fig. 2 is a diagram for explaining a take-up operation.

[Fig. 3] Fig. 3 is a diagram for explaining a take-up operation subsequent to Fig. 2.

[Fig. 4] Fig. 4 is a diagram for explaining a take-up operation subsequent to Fig. 3.

[Fig. 5] Fig. 5 is a diagram for explaining a take-up operation subsequent to Fig. 4.

[Fig. 6] Fig. 6 is a schematic configuration diagram of a conventional carousel reel facility.

EMBODIMENT MODE FOR CARRYING OUT THE INVENTION

[0017] A carousel reel facility according to the present invention will be described in detail by using the drawings.

EMBODIMENT

[0018] Fig. 1 is a schematic configuration diagram of a carousel reel facility according to one embodiment of the present invention. Fig. 2 is a diagram for explaining a take-up operation. Fig. 3 is a diagram for explaining a take-up operation subsequent to Fig. 2. Fig. 4 is a diagram for explaining a take-up operation subsequent to Fig. 3. Fig. 5 is a diagram for explaining a take-up operation subsequent to Fig. 4.

[0019] The carousel reel facility 1 shown in Fig. 1 is, for example, provided on a delivery side of a continuous tandem rolling mill including multiple rolling mill stands, in an unillustrated cold rolling mill line for manufacturing a cold-rolled strip (hereinafter, referred to as strip S). The strip S is formed as follows. Preceding strip Sf and following strip Sb (see Figs. 2 to 5) which are hot milled and coiled are unwound on the entry side of the continuous tandem rolling mill. Then, a trailing edge of the preceding strip Sf and a leading edge of the following strip Sb are connected. The above processing is repeated. Thus formed strip S is continuously fed to the continuous tandem rolling mill.

[0020] As shown in Fig. 1, a pair of upper and lower entry-side rollers 11a, 11b is rotatably supported on the entry side of the carousel reel facility 1. These entry-side rollers 11a, 11b are disposed facing each other to hold the transported strip S in between.

[0021] A pair of upper and lower drum shears 12a, 12b is rotatably supported downstream of the entry-side rollers 11a, 11b. These drum shears 12a, 12b are disposed facing each other to hold the strip S transported from the entry-side rollers 11a, 11b in between. Cutting blades 121a, 121b are provided on the circumferential portions of the drum shears 12a, 12b, respectively, and are arranged to face each other when the drum shears are rotated. In other words, when the drum shears 12a, 12b make one revolution synchronously with the transport speed of the strip S and synchronously with each other in opposite directions, the protruding cutting blades 121a, 121b cut the strip S at a predetermined position.

[0022] A deflector roller 13 is rotatably supported downstream of the drum shears 12a, 12b. The deflector roller 13 changes the transport direction of the strip S by winding the strip S thereon.

[0023] Guide plates 14, 15 are provided below the deflector roller 13. The guide plate 14 extends in the transport direction of the strip S and is fixed. The guide plate 15, which will be described in detail later, is supported to be moveable between a guide position for guiding the strip S and a retracted position where the guide 15 is retracted from the guide position. Note that the guide plate 15 shown in Fig. 1 is disposed at the guide position.

[0024] Meanwhile, a disk shaped carousel reel 21 is provided on a delivery side of the carousel reel facility 1, and is rotationally driven about a substantially-horizontal axis thereof. A first take-up drum 22 and a second take-up drum 23 are provided on a front surface of the carousel reel 21, and are supported in such a manner as to be rotatable about substantially-horizontal axes thereof, respectively. The first take-up drum 22 and the second take-up drum 23 are arranged to be symmetrical with respect to the rotation axis of the carousel reel 21. The first take-up drum 22 takes up the cut preceding strip Sf, and the second take-up drum 23 takes up the cut following strip Sb.

[0025] Note that, in the rotating state of the carousel reel 21 shown in Fig. 1, the first take-up drum 22 is disposed at a take-up start position on a reel upstream side, and the second take-up drum 23 is disposed at a take-up completion position on a reel downstream side. The take-up positions of the first take-up drum 22 and the second take-up drum 23 can be switched by revolving the carousel reel 21 180° clockwise. The take-up start position is set to be lower than the take-up completion position, and also the take-up drum 22, 23 disposed at the take-up start position is disposed at substantially the same height as the deflector roller 13. In other words, the take-up start position is set to be substantially the same height as the pass line of the strip S transported from the entry side of the carousel reel facility 1.

[0026] Here, a belt wrapper 24 is attachable and detachable to the first take-up drum 22 or the second take-up drum 23 disposed at the take-up start position. The belt wrapper 24 has a configuration in which a pressing belt is wound around multiple rollers. The belt wrapper 24 is wound around a circumferential surface of the take-up drum 22, 23, thereby assisting the leading edge of the cut strip Sf or Sb to be wrapped around the circumferential surface of the take-up drum 22, 23.

[0027] In addition, multiple rotatable snubber rollers 25 (three in the drawings) are attachable and detachable to the first take-up drum 22 or the second take-up drum 23 disposed at the take-up completion position. The snubber rollers 25 are swingably supported, and come into contact with the circumferential surface of the strip Sf or Sb taken up by the take-up drum 22, 23, while following an increase in the coil diameter of the strip. The snubber rollers 25 thus press the strip Sf or Sb taken up in a coil shape so that the strip does not spring back. In other words, as the coil diameter of the strip S increases along with progress in the taking-up of the strip S by the take-up drum 22, 23, the snubber rollers 25 swing outward in the coil diameter direction while pressing against the circumferential surface of the strip S.

[0028] The snubber roller (pressing means) 25 disposed at the highest position is rotatably supported by a tip of a swing arm 26. The swing arm 26 is swingably supported at its base end. A receiving pad 27 is provided at the tip of the swing arm 26 in such a manner as not to interfere with the rotation of the snubber roller 25.

[0029] Moreover, a base end of a guide frame 31 is swingably supported by a rotation shaft of the deflector roller 13. A guide roller 32 is rotatably supported by a tip of the guide frame 31. The guide roller 32 is disposed to face an upper surface of the receiving pad 27.

[0030] In addition, magnets 33 and support rollers 34 are alternately provided on a bottom surface of the guide frame 31 from the base end to the tip end thereof. The support rollers 34 are disposed so that circumferential surfaces thereof may protrude from attracting surfaces of the magnets 33. Meanwhile, a link member 35 is provided on an upper surface of the guide frame 31. One end of a link bar 36 is swingably supported by the link member 35. A rod 37a of an elevating/lowering cylinder 37 is swingably supported by the other end of the link bar 36. Further, the base end of the elevating/lowering cylinder 37 is also swingably supported.

[0031] Note that the guide frame 31, the guider roller 32, the magnets 33, and the support rollers 34 constitute guiding means, and that the link member 35, the link bar 36, and the elevating/lowering cylinder 37 constitute swinging means and swing allowing means.

[0032] Extension of the rod 37a of the elevating/lowering cylinder 37 brings the guide roller 32 of the guide frame 31 into contact with the receiving pad 27 of the swing arm 26. As a result, the guide frame 31 is swung to a guide position, and the strip S (strip Sf or Sb) to be taken up by the take-up roller 22, 23 disposed at the take-up completion position can be guided by the support rollers 34 while being attracted by the magnets 33 (see Fig. 1).

[0033] Meanwhile, contraction of the rod 37a of the elevating/lowering cylinder 37 brings the guide roller 32 of the guide frame 31 away from the receiving pad 27 of the swing arm 26. As a result, swung to a retracted position, the guide frame 31 can avoid interference with the take-up drums 22, 23 which are moved by the revolution of the carousel reel 21 (see Figs. 4 and 5).

[0034] When disposed at the guide position, the guide frame 31 is made to swing by the snubber roller 25 and the guide roller 32 as the coil diameter of the strip S (strip Sf or Sb) taken up by the take-up drum 22, 23 disposed at the take-up completion position increases. When the guide frame 31 is made to swing as described above, the rod 37a of the elevating/lowering cylinder 37 is maintained in the extended state. Meanwhile, the link member 35, the link bar 36, and the elevating/lowering cylinder 37 swing to operate as a link mechanism which allows the guide frame 31 to swing.

[0035] A demagnetizing device 38 is provided in the guide frame 31 in such a manner as to face the magnets 33. The demagnetizing device 38 demagnetizes peripheral devices magnetized by the magnetic forces of the magnets 33 when the carousel reel facility 1 is shut down and the magnetic forces of the magnets 33 are being turned off.

[0036] Next, the take-up operations of the carousel reel facility 1 will be described in detail by using Figs. 2 to 5.

[0037] First, as shown in Fig. 2, the direction of the strip S (strip Sf) cold-rolled by the continuous tandem rolling mill is changed by the deflector roller 13, and the strip Sf is then taken up by the first take-up drum 22 having moved to the take-up completion position.

[0038] At this time, the snubber rollers 25 are in contact with the circumferential surface of the preceding strip Sf taken up by the first take-up drum 22. The snubber rollers 25 thus press the preceding strip Sf so that the strip does not spring back. Meanwhile, the rod 37a of the elevating/lowering cylinder 37 is extended to bring the guide roller 32 in contact with the receiving pad 27, so that the guide frame 31 is disposed at the guide position. Accordingly, the preceding strip Sf is attracted to the magnets 33, and comes into contact with the support rollers 34. As a result, the preceding strip Sf is stably guided to the first take-up drum 22 by the rotation of the support rollers 34 without fluttering or springing back.

[0039] Note that the second take-up drum 23 having moved to the take-up start position is in a stand-by as a substitute while being rotationally driven. The belt wrapper 24 is wound around the circumferential surface of the second take-up drum 23.

[0040] Next, as shown in Fig. 3, the snubber rollers 25 swing outward in the coil diameter direction of the preceding strip Sf as the coil diameter of the preceding strip Sf taken up by the first take-up drum 22 increases. Along with this, the swing arm 26 also swings. Thereby, the guide roller 32 rolls on the receiving pad 27 of the swing arm 26, and consequently the guide frame 31 also swings.

[0041] As described, the snubber rollers 25 swing along with the increase in the coil diameter of the preceding strip Sf, and the link member 35, the link bar 36, and the elevating/lowering cylinder 37 in the extended state performs the link operation. This causes the guide frame 31 to swing at substantially the same angle as a take-up angel of the preceding strip S in accordance with the swinging of the snubber rollers 25. As a result, the attracting surfaces of the magnets 33 are always parallel to the surface of the preceding strip Sf. Thus, efficient attracting is performed, and the surface of the preceding strip Sf is securely in contact with the circumferential surfaces of the support rollers 34 to stably guide the preceding strip Sf. Moreover, since there is no need to operate the elevating/lowering cylinder 37, the guide frame 31 operates in accordance with the snubber rollers 25 through the guide roller 32 without any response delay to the swinging of the snubber rollers 25.

[0042] Thereafter, when the coil diameter of the preceding strip Sf taken up by the first take-up drum 22 reaches a certain size, the cutting blades 121a, 121b protrude from the drum shears 12a, 12b rotationally driven, thereby cutting the connecting portion between the preceding strip Sf and the following strip Sb. At this time, since the preceding strip Sf is attracted to the magnets 33 of the guide frame 31 before being cut and is therefore stably guided, the trailing edge of the preceding strip Sf is stably guided along the support rollers 34 to the first take-up drum 22 without fluttering or springing back even after the preceding strip Sf loses its tension by being cut.

[0043] Then, as shown in Fig. 4, a coil of the preceding strip Sf taken up by the first take-up drum 22 is pulled out by an unillustrated coil pulling-out device. At this time, the rod 37a of the elevating/lowering cylinder 37 contracts to move the guide frame 31 to the retracted position, and the snubber rollers 25 are also retracted outward from the carousel reel 21.

[0044] Meanwhile, the attraction of the lowermost (base end side of the guide frame 31) magnet 33 is turned off, and therefore the cut following strip Sb travels on the guide plate 15 having moved to the guide position and is taken up by the second take-up drum 23 disposed at the take-up start position. At this time, since the belt wrapper 24 is wound around the circumferential surface of the second take-up drum 23, the leading edge of the cut following strip Sb is securely wound around the circumferential surface of the second take-up drum 23.

[0045] Next, as shown in Fig. 5, the guide plate 15 is moved to the retracted position, and the belt wrapper 24 is released from the second take-up drum 23 and retracted downward. Then, the carousel reel 21 is revolved 180°. Thus, the second take-up drum 23 is moved to the take-up completion position while taking up the following strip Sb. On the other hand, the first take-up drum 22 is moved to the take-up start position to be in the stand-by state. Thereafter, similar take-up operations are repeated in sequence.

[0046] The carousel reel facility of the present invention achieves the following. The tip of the guide frame 31 is caused to be attachably and detachably in contact with the snubber roller 25 which is pressing against the circumferential surface of the strip S taken up at the take-up completion position, while following an increase in the coil diameter. This allows the guide frame 31 to swing in accordance with the coil diameter following operation of the snubber rollers 25. Thus, the strip S is attracted to the magnets 33 regardless of its coil diameter, and comes into contact with the support rollers 34. Accordingly, even when the strip S is cut and is released from tension, the trailing edge thereof is stably guided to the take-up drum 22, 23 disposed at the take-up completion position.

[0047] Moreover, when the snubber roller 25 performs the coil diameter following operation in accordance with an increase in the coil diameter, the rod 37a of the elevating/lowering cylinder 37 is maintained at the extended state, and the link member 35, the link bar 36, and the elevating/lowering cylinder 37 operate as the link mechanism. This allows the guide frame 31 to swing at substantially the same angle as the take-up angle of the strip S. Thus, the strip S is effectively attracted to the magnets 33, and is stably guided by the support rollers 34. In addition, the guide frame 31 can operate in accordance with the coil diameter following operation of the snubber rollers 25 without any response delay.

[0048] As a result, fluttering and moving around of the trailing edge of the strip S due to springback of the strip S toward the take-up completion position at the time of the cutting is prevented. This can prevent folding or damaging of the trailing edge, and in turn, damaging of the peripheral devices. Accordingly, there is no need to reduce the transport speed of the strip S more than necessary when the cutting is performed. For example, the transport speed of the strip S when the cutting is performed can be set to 250 m/min to 350 m/min. This not only increases the productivity, but also eliminates the risk of adversely affecting a plate-shape control of the strips S during rolling. As a result, the strip S can be rolled highly accurately, and the quality thereof can be improved.

[0049] Furthermore, in the carousel reel facility according to the present invention, when the transport speed of the strip S is 250 m/min to 300 m/min during the cutting, the trailing edge of the strip S can be guided only by the support rollers 34 without the strip S being attracted to the magnets 33. Thus, the carousel reel facility is configured to perform the attraction of the magnets 33 only when the transport speed of the strip S is 300 m/min to 350 m/min during the cutting.

INDUSTRIAL APPLICABILITY

[0050] The present invention is applicable to a highly productive carousel reel facility having excellent yield.

EXPLANATION OF REFERENCE NUMERALS

[0051] 

1

Carousel reel facility

11a, 11b

Entry-side roller

12a, 12b

Drum shear

121a, 121b

Cutting blade

13

Deflector roller

14, 15

Guide plate

21

Carousel reel

22

First take-up drum

23

Second take-up drum

24

Belt wrapper

25

Snubber roller

26

Swing arm

27

Receiving pad

31

Guide frame

32

Guide roller

33

Magnet

34

Support roller

35

Link member

36

Link bar

37

Elevating/lowering cylinder

37a

Rod

38

Demagnetizing device

Claims

1. A carousel reel facility in which
a disk-shaped revolvable carousel reel is provided with two rotatable take-up drums disposed at respective positions symmetric to each other with respect to a rotation axis of the carousel reel,
one of the take-up drums which is disposed on an upstream side starts to take up a preceding strip,
during the taking-up, the carousel reel is revolved to move the one take-up drum to a downstream side and the other take-up drum to the upstream side, and
in this state, a trailing edge of the preceding strip is cut, and a leading edge of a following strip is taken up by the other take-up drum, the carousel reel facility characterized by comprising:

a deflector roller provided on an entry side of the carousel reel at a position almost as high as the take-up drum disposed on the upstream side, the deflector roller guiding the transported strip to any of the take-up drums disposed on the upstream side and the downstream side;

pressing means that presses against a circumferential surface of the strip taken up by the take-up drum disposed on the downstream side, while following an increase in a coil diameter of the strip and thus prevents fluttering of the trailing edge of the cut strip;

guiding means supported in such a manner as to be swingable about a rotation shaft of the deflector roller, the guiding means guiding the trailing edge of the cut strip to the take-up drum disposed on the downstream side while having a tip of the guiding means work in accordance with a coil diameter following operation of the pressing means;

swinging means that causes the guide frame to swing so that the guide frame dose not interfere with the take-up drums moved by the revolution of the carousel reel; and

swing allowing means that allows the guiding means to swing in accordance with the coil diameter following operation of the pressing means without operating the swinging means.

2. The carousel reel facility according to claim 1 characterized in that a transport speed of the strip during the cutting is set to 250 m/min or higher.

3. The carousel reel facility according to claim 1 characterized in that
the guiding means includes a magnet for attracting the strip by magnetic force and a roller protruding out relative to an attracting surface of the magnet, and
attraction by the magnet is performed when a transport speed of the strip during the cutting exceeds 300 m/min.

Drawing