JP2745390B2 - Winding device for surface-treated metal strip and its winding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a winding device and a winding method for winding a surface-treated metal strip such as a plated steel plate or a coated steel plate into a coil.

[0002]

2. Description of the Related Art It is known from Japanese Patent Publication No. 6-102215 that a winding start end of a metal strip is automatically wound around a winding core by a belt wrapper in a winding apparatus of this kind. Examples of a tensioning device for giving a moderate back tension to a metal strip to be wound include Japanese Patent Publication No. 1-23.
No. 207, a roll bridle is generally used. A metal strip is wound around two rolls in a Z-shape, and the number of rotations of each roll is varied, so that a back tension is applied to the metal strip. Is given.

[0003]

In a conventional apparatus for winding a metal strip while applying a back tension with a roll bridle, it may not be possible to provide a sufficient back tension to the metal strip. Since the tension is applied by the contact friction between the rotating roll and the metal strip, the maximum value of the tension that can be applied is limited. In addition, since the plating layer and the coating film must not be damaged, the range of change in the tension that can be applied cannot be increased. This means that the metal strip cannot be wound in a tightly wound state, and this causes a problem particularly when the strip width is large.

It is known that in a roll bridle, a larger tension can be applied by increasing the diameter of the roll or increasing the number of rolls. However, even in the present situation, the diameter of the roll is sufficiently large, so if a roll having a larger diameter is used or the number of used rolls is increased, a driving device is also required, and it is inevitable that the occupying space of the tensioning device as a whole increases. However, the equipment cost for that also increases.

[0005] The surface of the roll applied to the roll bridle is polished extremely smoothly in order to prevent scratches on the plating layer and the coating film, and the roundness and surface roughness are maintained in a predetermined state. The need to maintain regular maintenance is indispensable. During such maintenance work, the roll must be disassembled from the tensioning device and the roll surface must be polished again, which has the disadvantage of requiring much labor and time for maintenance. When the winding operation is started, the metal strip has to be wound around each roll in a Z-shape, which is troublesome in the operation, and there is room for improvement in this point as well.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a metal strip with sufficient back tension so that the metal strip can be wound into a coil in a tightly tightened state, and the metal strip sent from the preceding processing step can be manually handled. It is an object of the present invention to provide a winding device for a surface-treated metal strip and a winding method for the same, which can start winding automatically without the need. SUMMARY OF THE INVENTION It is an object of the present invention to provide a winding device and a winding method capable of applying an appropriate back tension to a metal strip from the start of winding of the metal strip to the end of winding. An object of the present invention is to reduce the installation space occupied by a tensioning device as compared with a conventional winding device, reduce the line length of a metal strip processing line such as a plating line or a painting line, and effectively use the space in a factory. It is an object of the present invention to provide a winding device and a winding method which can be performed and use less of the entire equipment. SUMMARY OF THE INVENTION An object of the present invention is to provide a winding device having a belt bridle type tensioning device capable of performing maintenance work with a small amount of time and a winding method thereof.

[0007]

A winding device according to the present invention comprises a belt bridle type tensioning device 1, an adjusting roll mechanism 2 and a belt bridle type tensioning device along a conveying path of a surface-treated metal strip S as shown in FIG. , A start sensor 3 and a winder 5 provided with a belt wrapper 4 are arranged in order.

As shown in FIG. 3, the tensioning device 1 has a pair of upper and lower winding mechanisms 8, 9 for holding the metal strip S, and an operation for operating at least one of the two mechanisms 8, 9 toward and away from the other side. Vessel 10. Each of the two winding mechanisms 8 and 9 is composed of a pair of left and right pulleys 15 that are rotatably supported.
15 and a plurality of sets of winding elements including a pair of friction belts 16 wound between the pulleys 15 and 15; and a guide body 13 for receiving the inner surface of the group of friction belts 16 contacting the metal strip S. ing.

The adjusting roll mechanism 2 includes a deflector roll 19 for deflecting and guiding the metal strip S toward the winding surface of the winder 5, and a pressing roll 20 provided to be able to freely contact and separate from the deflector roll 19. Equipped, both rolls 19 and 20
Is provided rotatably, and the other is provided rotatably.

[0010] Specifically, a speed sensor 41 for detecting the moving speed of the metal strip S is provided on the transport path between the tensioning device 1 and the adjusting roll mechanism 2 as shown in FIG.
Then, based on the output signal of the speed sensor 41,
The deflector roll 19 is configured to be driven to rotate in synchronization with the transition speed of the metal strip S. Further, a terminating sensor 36 for detecting the rear end of the metal strip S is provided on the upstream side of the tensioning device 1 in the transport direction of the metal strip S. Then, based on the output signal of the terminal sensor 36, the pressing roll 20 is configured to press and contact the deflector roll 19 via the metal strip S.

In the winding method of the present invention, as shown in FIG. 1, along the transport path of the metal strip S whose surface has been treated, the metal strip S is provided so as to be freely rotatable so as to provide a back tension by vertically sandwiching the metal strip S. Pair of winding mechanisms 8
9 comprising a belt bridle type tensioning device 1 including a deflector roll 19 and a pressing roll 20 which is operated to approach and separate from the roll 19.
An adjusting roll mechanism 2, one of which is rotatably provided, a start-end sensor 3 for detecting the leading end of the metal strip S, and a winding machine 5 provided with a belt wrapper 4 are arranged in this order.

Thus, the pressing roll 20 is pressed against the deflector roll 19 via the metal strip S based on the output signal when the starting end sensor 3 detects the leading end of the metal strip S. After the above-mentioned signal output from the start sensor 3, the tension device 1 is operated when the metal strip S is tightly mounted on the winder 5 by the belt wrapper 4, and the metal strip S is moved by the upper and lower winding mechanisms 8 and 9. S is given a back tension. Simultaneously with or immediately after the operation of the tensioning device 1, the pressing roll 20 is returned to a non-pressure state, and the winding is continued.

More specifically, a speed sensor 41 for detecting the moving speed of the metal strip S is provided on a transport path between the tensioning device 1 and the adjusting roll mechanism 2.
1, the deflector roll 19 is rotationally driven in synchronization with the transition speed of the metal strip S. Furthermore, an end sensor 3 for detecting the rear end of the metal strip S on the upper side in the transport direction of the metal strip S than the tensioning device 1.
6 based on the output signal of the terminal sensor 36,
The pressing roll 20 is pressed against the deflector roll 19 via the metal strip S to wind up the rear end of the strip.

[0014]

The belt bridle type tensioning device 1 applies back tension to the metal strip S wound by the winder 5 with the metal strip S sandwiched between a pair of upper and lower winding mechanisms 8 and 9. At this time, the friction belt 16 is
And a frictional resistance is generated between the guide body 13 and the inner surface of the guide body 13 to generate a tension. Therefore, only by changing the contact pressure between the guide body 13 and the friction belt 16,
A sufficiently large back tension can be provided, and the range of change can be expanded. Since the guide body 13 and the friction belt 16 are in sliding contact with each other to generate a braking force due to frictional resistance therebetween, the treated surface of the metal strip S is not scratched.

In the standby state, the pair of winding mechanisms 8.9
Is separated, and the metal strip S sent from the preceding processing step can pass therewith without any trouble. Further, the pressing roll 20 is separated from the deflector roll 19,
Similarly, the metal strip S is allowed to pass therethrough. Therefore, the metal strip S is transferred to the tensioning device 1 and the adjusting roll mechanism 2 without any trouble only by the conveying force from the pre-processing step. At this time, after waiting for the leading edge of the metal strip S to be detected by the start sensor 3, the pressing roll 20 is pressed toward the deflector roll 19, and the metal strip S is sandwiched and held between the two rolls 19 and 20. The strip S is transported toward the winder 5. Further, the tip of the metal strip S is wound several times around the winder 5 by the belt wrapper 4, and when a tightening force is generated, the metal strip S is sandwiched by the upper and lower winding mechanisms 8.9 to give back tension, It is raised to a predetermined winding tension.
Accordingly, an appropriate back tension can be given to the metal strip S in parallel with the automatic winding by the belt wrapper 4. At the same time or immediately after this operation, the pressing roll 20 is returned to the non-pressure state, and the state is shifted to the steady operation state.

The deflector roll 19 is connected to a metal strip S.
The rotation of the metal strip S is synchronized with the transition speed of the metal strip S in order to avoid slipping while the metal strip S is deflected and guided by the deflector roll 19 and to prevent the processing surface from being scratched. Metal strip S to
This is to prevent the occurrence of slip when the winding angle is small. When the end sensor 36 detects the rear end of the metal strip S, the pressing roll 20 is pressed again against the deflector roll 19 because the rear end of the strip is stably conveyed and held to the end, and immediately before the end of winding. This is for giving the back tension to the metal strip S to the last minute.

[0017]

According to the winding device of the present invention, a back tension is applied to a pair of upper and lower winding mechanisms 8, 9 which can be separated from each other with the metal strip S interposed therebetween. In addition, deflector roll 1
The metal strip S is conveyed toward the winder 5 by the press roll 9 and the pressing roll 20 that is operated to approach and separate from the roll 19. Accordingly, the tensioning device 1 and the adjusting roll mechanism 2 can be used to hold the winding mechanisms 8 and 9 and the pressing roll 20 in a standby state without any need for the manual operation of the metal strip S sent from the preceding processing step. Then, the metal strip S can be conveyed with the pressing roll 20 and the deflector roll 19 sandwiched therebetween, and all of a series of operations from the path setting of the metal strip S to the winding of the strip leading end by the belt wrapper 4 are performed. Can be done automatically.

Since a back tension is applied to the metal strip S by a pair of freely rotatable upper and lower winding mechanisms 8 and 9, a larger back tension can be generated if necessary, and the width and thickness of the metal strip S can be increased. Even when the size is increased, sufficient back tension is applied to the metal strip S so that the metal coil can be formed in a tightly tightened state.

Since a sufficiently large back tension can be generated by the pair of upper and lower winding mechanisms 8 and 9, the installation space occupied by the tensioning device 1 can be reduced as compared with a conventional winding device having a roll bridle, and accordingly, Only the line length of the surface treatment line can be reduced and the space in the factory can be used effectively. Compared with the case where the tension control is performed with a larger roll bridle, the cost of installing the entire winding device can be reduced, and the cost of introducing the winding device can be reduced. In most cases, maintenance of the tensioning device 1 only requires replacing the friction belt 16, which is a consumable part. This greatly reduces the labor and cost required for maintenance work, and reduces the maintenance cost of the tensioning device 1. it can.

[0020]

1 to 4 show an embodiment of a winding device according to the present invention. In FIG. 1, the winding device moves along a conveying path of a metal strip (hereinafter, simply referred to as a strip) S.
Belt bridle type tensioning device 1 and adjusting roll mechanism 2
And a start-end sensor 3 for detecting the passage of the strip S at the transport front end, and a winding machine 5 provided with a belt wrapper 4 in this order. The strip S has been surface-treated on one surface or both front and back surfaces in the processing steps up to the preceding stage. For example, after plating on each of the front and back surfaces, a base treatment is performed on the outer surface of the plating layer, and a paint is applied to each of the front and back surfaces to be dried and solidified.

In FIGS. 3 and 4, the tensioning device 1 is provided with a gate-shaped frame 7 that straddles the transport path of the strip S back and forth.
And a pair of upper and lower winding mechanisms 8.9 that sandwich the strip S therebetween.
And a pair of front and rear operation devices 10 for vertically operating the upper winding mechanism 8 with respect to the lower winding mechanism 9. Of the two winding mechanisms 8, 9, the lower winding mechanism 9 is fixedly supported by the frame 7, and the upper winding mechanism 8 is vertically moved by guides 7a (see FIG. 4) provided on the front and rear frames of the frame 7. It is slidably supported. As the operating device 10, a hydraulic cylinder or an air cylinder can be applied, and its piston rod is connected to the front and rear ends of a pulley frame 12 described later.

As shown in FIG. 3, the upper winding mechanism 8 includes a pulley frame 12 having a pair of left and right parallel pulley shafts 11 and a plurality of pulley frames 12 arranged adjacent to each other along the axis of the two pulley shafts 11. It is composed of a set of winding elements, a guide 13 fixed to the lower surface of the pulley frame 12, a reinforcing frame, and the like. The winding element is a bearing 1 on each pulley shaft 11.
A pair of left and right pulleys 15 that are freely rotatably supported via
And a pair of flat belt-shaped friction belts 16 wound around these pulleys 15.

The friction belt 16 is formed in two layers, inner and outer. Specifically, the contact layer 1 on the outer surface that contacts the strip S
6a, such as rubber or cloth or cloth impregnated with rubber,
It is formed of a material with a large coefficient of friction. Also, the guide body 13
The sliding layer 16b on the inner surface that slides against the contact layer 1 such as a steel belt or a plastic belt having excellent lubricity.
The friction belt 16 is made of a material having a smaller coefficient of friction than 6a, so that the friction belt 16 can smoothly slide on the guide body 13 even when the clamping pressure is large. The guide body 13 is a hollow body made of a copper alloy having a cooling water passage 17 therein, and a pulley frame in a state in which the outer surfaces of a group of friction belts 16 project from the outer tangents of the left and right pulleys 15 to the lower surface side. 12 attached.

The lower winding mechanism 9 is obtained by inverting the above-described winding mechanism 8 up and down.
Is fixed to the frame 17. Activate the operating device 10,
When the upper winding mechanism 8 is pressed down, the upper and lower friction belts 16 and 16 are strongly pressed by the guides 13 and 13, respectively, and sandwich the strip S from above and below.

The adjusting roll mechanism 2 is provided with a freely rotatable deflector roll 19 for deflecting and guiding the strip S toward the winding surface of the winder 5, and is disposed above the deflector roll 19 to be in contact with the roll 19. And a pressing roll 20 provided so as to be able to be separated. The press roll 20 can be driven to rotate by a motor 21 when necessary, as shown in FIG. For example, when the diameter of the deflector roll 19 is 800 mm, the diameter of the pressing roll 20 is set to about 200 mm.

The start sensor 3 comprises an optical sensor having a light projecting portion 3a and a light receiving portion 3b as shown in FIG.
In a state where the light emitting path crosses the transport path of the strip S,
The light projecting unit 3a and the light receiving unit 3b are arranged vertically. A guide swash plate 22 is provided between the start sensor 3 and the winder 5 to guide the transfer end of the strip S toward the winder 5.

The winding machine 5 is provided with a motor 24 as shown in FIG.
And a winding shaft 25 that is driven to rotate. The winding shaft 25 supports a winding core 26. The bell trapper 4 has an arm 28 supported by the frame 5a of the winder 5 so as to be able to swing left and right. Along the outer line of the arm 28, a guide pulley 29, a pair of upper and lower tip guides 30 and 31, and a belt absorbing member An arm 32 is provided, and an endless winding belt 33 is wound around these members 29 to 32. In the non-use state, the arm 28 is displaced to the upper standby position shown by the imaginary line, and is displaced to the operating position shown by the solid line only when the leading end of the strip is wound around the winding core 26.
In the illustrated example, the tip guides 30 and 31 are operated in the lower winding state. Since the belt wrapper 4 is a known mechanism, a detailed description thereof will be omitted.

An end sensor 36 is provided between the tensioning device 1 and the guide roll 35 located on the upper side in the transport direction. The end sensor 36 is constituted by an optical sensor similar to the start sensor 3. The output signals of the start sensor 3 and the end sensor 36 described above are sent to the control device 37, respectively. The control device 37 determines the operating state and operating state of each device such as the tensioning device 1, the adjusting roll mechanism 2, and the winder 5 based on input signals from the sensors 3 and 36 and command signals output separately. Control.

The strip S sent from the preceding processing step to the winding device via the guide roll 35 is automatically wound into a coil according to the following procedure. Before starting the winding operation, the winding core 26 is fixed to the winding shaft 25,
The bell trapper 4 is in the operating position. Further, each of the tensioning device 1 and the adjusting roll mechanism 2 is in a standby state. Upper winding mechanism 8 and pressing roll 20
Are respectively lifted upward, and both of them are retracted from the transport path of the strip S. Thereby, the sent strip S passes through the tensioning device 1 and the adjusting roll mechanism 2 without any trouble.

The transport end of the strip S is the start sensor 3
When the optical path is blocked, a detection signal is output from the light receiving section 3b of the start sensor 3. Based on this signal, the controller 37
Outputs an operation signal to the operation device of the pressing roll 20, and causes the pressing roll 20 to pass through the strip S to the deflector roll 19.
To stabilize the transport state of the strip S.

When the strip S is wound around the winding core 26 several times after receiving the detection signal from the start sensor 3 and a tightening force is generated, the winding mechanism 8 of the tensioning device 1 is lowered by the operation device 10. The strip S is vertically held in cooperation with the lower winding mechanism 9. The generation of this tightening force
It appears as a change in load current flowing through the motor 24 of the winding machine 5. This change in current is detected, and the tensioning device 1 is operated. At this time, the friction belt 16 moves along with the strip S, and slides on the contact surface with the guide body 13 to generate frictional resistance. This frictional resistance acts as a back tension on the strip S. Therefore, the back tension can be freely changed over a wide range only by changing the operating pressure of the operating device 10 to a large or small value. Even when the width of the strip S is changed or the thickness dimension is different, a necessary and sufficient back tension can be provided.

As described above, the change in the load current flowing through the motor 24 of the winder 5 is detected, and the pressing roll 20 is put in a non-pressure state, that is, the pressing roll 20 separates from the surface of the strip S and returns to the standby position. Switch to the At the same time, the belt wrapper 4 returns to the standby position and swings. Thereafter, winding is continued with the tension acting on the strip S being optimized.

When the trailing edge of the strip S is detected by the terminal sensor 36, the pressing roll 20 is switched to the pressing state again based on the output signal. Therefore,
Even after the rear end of the strip S has passed through the tensioning device 1, the strip S is conveyed and moved by the pressing roll 20 and the deflector roll 19 until the rear end of the conveyance passes through the adjusting roll mechanism 2. Maintain proper tension. Finally, the trailing end of the transport is detected by the start sensor 3 and the tensioning device 1 and the adjusting roll mechanism 2 are returned to the standby state.
Motor 24 is stopped. Thereafter, the metal coil together with the winding core 26 is removed from the winding shaft 25, and a new winding core 26 is mounted on the winding shaft 25 to prepare for the next winding.

The winding device described above can be partially modified and implemented as shown in FIG. The deflector roll 19 of the adjusting roll mechanism 2 is rotatably driven by the motor 40, and the pressing roller 20 is freely rotatably supported, so that the deflector roll 19 can be simply moved toward and away from the deflector roll 19. A speed sensor 4 for detecting a moving speed of the strip S on a transport path between the tensioning device 1 and the adjusting roll mechanism 2.
1 is provided. In order to operate the speed sensor 41 only when necessary, a pair of rolls 42.
43 is arranged, and the upper roll 42 is vertically displaced by an operating device (not shown) in the same manner as the pressing roll 20. Further, a speed sensor 41 is disposed at one end of the upper roll 42, and the transfer speed of the strip S is known from the rotation speed of the roll 42.

The upper roll 42 is pushed down on the basis of an output signal when the start sensor 3 detects the front end of the transport of the strip S, and circumscribes the strip S to activate the speed sensor 41. Thereafter, based on the output signal from the speed sensor 41, the driving speed of the motor 40 is synchronized with the transition speed of the strip S. According to such a winding device, since the peripheral speed of the deflector roll 19 is completely synchronized with the transition speed of the strip S, no slip occurs between the deflector roll 19 and the strip S. That is, abrasion flaws on the processing surface of the strip S due to slippage can be reliably prevented.

As the start sensor 3 and the end sensor 36, various sensors such as an image sensor, an infrared sensor, and a magnetic sensor can be applied in addition to the optical sensor. The bell trapper 4 can take any form other than the illustrated mechanism, and it is essential that the bell trapper 4 has a function of automatically winding the leading end of the strip around the core 26. The back tension may be adjusted by operating the operating device 10 to move the lower winding mechanism 9 or both of the upper and lower winding mechanisms 8 and 9 toward and away from the operating device 10.

[Brief description of the drawings]

FIG. 1 is a principle explanatory view conceptually showing a winding device.

FIG. 2 is a schematic front view of the winding device.

FIG. 3 is a longitudinal sectional front view of a main part of the tensioning device.

FIG. 4 is a view taken in the direction of arrows AA in FIG. 3;

FIG. 5 is a schematic front view showing another embodiment of the winding device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Tension device 2 Adjusting roll mechanism 3 Start end sensor 4 Bell trapper 5 Winder 8.9 winding mechanism 10 Operating device 19 Deflector roll 20 Press roll 26 Core 36 End sensor 41 Speed sensor S Metal strip

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B65H 20/02 B65H 20/02 Z 23/188 23/188 Z 23/30 23/30

Claims (6)

(57) [Claims] 1. A winding device 5 including a belt bridle type tensioning device 1, an adjusting roll mechanism 2, a start end sensor 3, and a belt wrapper 4 along a conveying path of a surface-treated metal strip S. Are arranged in order, and the tensioning device 1 comprises a pair of upper and lower winding mechanisms 8.9 for holding the metal strip S and at least one of the two mechanisms 8.9 toward the other side. A pair of right and left pulleys 15 and 15 each of which is freely rotatably supported, and a pair of right and left pulleys 15 and 15;
Numerous sets of winding elements, each including a friction belt 16 wound between the belts, and a friction belt 16 contacting the metal strip S.
The adjusting roll mechanism 2 includes a deflector roll 19 that guides the metal strip S toward the winding surface of the winding machine 5 and a guide member 13 that receives the inner surface of the group. have a pressing roll 20 provided freely away, one of the rolls 19, 20 are rotatably disposed, the other is provided to freely idle, start sensor 3 is made of metal strip S Detects the leading edge of the transfer
The pressing roll 20 is moved to the metal
Pressing the deflector roll 19 through the lip S
As a result, the pressing roll 20 and the deflector roll 19
The metal strip S is conveyed toward the winder 5 and is transferred to the winder 5.
After winding the metal strip S, the pressing roll 20
Return to the pressureless state away from the surface of the metal strip S
Control device for continuing winding of metal strip S
A winding device for a surface-treated metal strip, comprising a device 37 . 2. A transport path between the tensioning device 1 and the adjusting roll mechanism 2 is provided with a speed sensor 41 for detecting a transition speed of the metal strip S, based on an output signal of the speed sensor 41. The winding device for a surface-treated metal strip according to claim 1, wherein the deflector roll 19 is configured to be driven to rotate in synchronization with a transition speed of the metal strip S. 3. An end sensor 36 for detecting the rear end of the metal strip S is provided on the upstream side of the tensioning device 1 in the transport direction of the metal strip S, and based on an output signal of the end sensor 36, The pressing roll 20 is connected to the deflector roll 1 via the metal strip S.
3. The winding device for a surface-treated metal strip according to claim 1, wherein the winding device is configured to be brought into contact with the metal strip. 4. A belt including a pair of winding mechanisms 8, 9 slidably provided so as to provide back tension by vertically sandwiching the metal strip S along a transport path of the surface-treated metal strip S. Bridle type tensioning device 1
An adjusting roll mechanism 2 including a deflector roll 19 and a pressing roll 20 that is operated to be moved toward and away from the roll 19, and one of the rolls 19 is rotatably driven; A start-end sensor 3 that detects the leading end of the metal strip S and a winding machine 5 that has a belt wrapper 4 are sequentially arranged. The roll 20 is pressed against the deflector roll 19 via the metal strip S, and after the above-described signal output of the start sensor 3, when the metal strip S is fastened to the winder 5 by the belt wrapper 4, the tensioning device 1 is pressed. To operate the upper and lower winding mechanism 8
9. A surface-treated metal strip characterized in that a back tension is applied to the metal strip S at 9 and the pressing roll 20 is returned to a non-pressure state and winding is continued simultaneously with or immediately after the operation of the tensioning device 1. Winding method. 5. A speed sensor 41 for detecting a moving speed of the metal strip S is provided on a transport path between the tensioning device 1 and the adjusting roll mechanism 2.
The winding method for a surface-treated metal strip according to claim 4, wherein the deflector roll (19) is driven to rotate in synchronization with the transition speed of the metal strip (S) based on the output signal of (1). 6. A terminal sensor 36 for detecting the rear end of the metal strip S is provided on the upstream side of the tensioning device 1 in the transport direction of the metal strip S, and based on an output signal of the terminal sensor 36, the pressing roller 20 is controlled. The winding method for a surface-treated metal strip according to claim 4 or 5, wherein the rear end of the strip is wound by being pressed against the deflector roll 19 via the metal strip S.