JP2007331867A - Steering method for steel belt and steering device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact and inexpensive steering method and device for a steel belt capable of performing stable correction of meandering of the steel belt on an entrance side and an exit side of a turn roll. <P>SOLUTION: In the steering method and device for the steel belt for correcting meandering of the steel belt by moving the turn roll wound with the steel belt, a virtual fulcrum is provided in a plane parallel to the steel belt on the entrance side and the turn roll wound with the steel belt is moved in the plane parallel to the steel belt in a circular arc shape making the virtual fulcrum as a center. Thereby, both transferring effect for correcting an absolute position of the steel belt and thread-winding effect for correcting a relative position of the steel belt relative to the turn roll are simultaneously generated. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a steering method and a steering apparatus for correcting meandering of a steel strip used in a steel plate manufacturing facility.

  For example, in a steel strip production line, the present invention relates to a steel strip steering method and a steering device for correcting a meandering of a steel strip by moving a turn roll wound with a steel strip.

Conventionally, a steel strip steering device such as a looper, which is used with a 180 ° winding, has used a displacement type in which a turn roll is twisted at a right angle to the strip with the line center on the entry side as a fulcrum.
This steering device is a transfer effect type steering device that moves the exit side of the plate wound around the roll to the center of the line, and the response at the time of correcting the meandering of the plate is good, but the entrance side of the plate and the inside of the turn roll It is impossible to correct the deviation of the plate, and the structure becomes complicated due to the convenience of the correction operation, and an excessive frame is required.

As a solution to the above problem, in Japanese Patent Laid-Open No. 10-194540 (Patent Document 1), in addition to the correction operation of the displacement type steering device, an operation of tilting the rotating shaft of the roll is added to provide a three-dimensional view. A method has been introduced for generating a pincushion effect in the convergence direction during a correction operation by operating.
In Japanese Patent Laid-Open No. 10-297804 (Patent Document 2), a method of correcting an entrance side plate by operating an entrance side roll of a double roll displacement type steering device as a bobbin winding effect type steering device. Has been introduced.

  However, since these conventional techniques require complicated operations for the turn rolls, the controllability is poor and it is difficult to apply them to an actual steel sheet production line.

  In addition, with a conventional twist type device, since the meandering control is performed using the transfer effect, the responsiveness at the time of correcting the bias is good, but the bias of the plate inside the device and inside the roll cannot be corrected. Met.

In addition, it is possible to correct the deviation of the plate on the entry side of the device and inside the roll if it is a conventional spooling effect type device, but since it is controlled by proportional operation, the responsiveness is affected by the line speed and quickly. If correction is attempted, hunting is likely to occur, and if responsiveness is lowered and stable operation is performed, the bias correction tends to occur in time, and rollout tends to occur.
JP-A-10-194540 Japanese Patent Laid-Open No. 10-297804

  The present invention solves the problems of the prior art as described above, enables stable meandering correction of the steel strip on the entry side and the exit side of the turn roll, and is a compact and inexpensive steel strip steering method and steering system. It is an object to provide an apparatus.

As a result of intensive studies to solve the above-mentioned problems, the present invention moves a turn roll wound with a steel strip in an arc shape centering on the virtual fulcrum in a plane parallel to the steel strip, and By generating both a transfer effect that corrects the belt center and the line center to coincide with each other, and a pincushion effect that corrects the roll center and the steel strip center of the turn roll to coincide, The present invention provides a steel strip steering method and a steering device that are capable of stably correcting the meandering of the steel strip on the outgoing side, and that are compact and inexpensive, and the gist of the invention is as described in the claims. The contents are as follows.
(1) In a steel strip production line, a steel strip steering method for correcting meandering of a steel strip by moving a turn roll wound with a steel strip,
By providing a virtual fulcrum in a plane parallel to the steel strip on the entry side, and moving the turn roll wound around the steel strip in an arc shape centering on the virtual fulcrum in a plane parallel to the steel strip The transfer effect for correcting the steel strip width direction center (steel strip center) and the line center to coincide with each other, and the body length direction center (roll center) of the turn roll to match the steel strip center. A steel strip steering method characterized by generating both a pincushion effect to be corrected.
(2) The steel strip steering method according to (1), wherein the virtual fulcrum is located at a position 10 m or more away from the center axis of the turn roll in the steel strip entrance side direction.
(3) The method for steering a steel strip according to (1) or (2), wherein a winding angle of the steel strip around a turn roll is 180 degrees.
(4) In a steel strip production line, a steel strip steering device for correcting meandering of the steel strip by moving a turn roll around which the steel strip is wound,
A roll moving means for moving a turn roll wound with a steel strip in a direction perpendicular to the line in a plane parallel to the steel strip on the input side, and a plane parallel to the steel strip on the input side when the turn roll moves And a guide mechanism for guiding the turn roll so as to move in an arc shape around a virtual fulcrum at the center.
(5) The steel strip steering apparatus according to (4), wherein the guide mechanism is a slide guide including a slider that travels on a rail attached to a fixed frame via a base plate.
(6) By providing a plurality of long holes in the base plate for attaching the slide guide to the fixed frame of the guide mechanism, the position of the bolt for attaching the base plate can be adjusted to set the radius of the arc centered on the virtual fulcrum. (5) The steel strip steering device according to (5).

  According to the steering method and tearing device of the present invention, a turn roll wound with a steel strip is moved in an arc shape around the virtual fulcrum in a plane parallel to the steel strip, and the steel strip center of the steel strip is moved. Both the transfer effect for correcting the line center to coincide with the pincushion effect for correcting the center of the turn roll and the steel strip center, It is corrected quickly on both the machine entry and exit sides and is not affected by the line speed, and the roll inclination that generates the bobbin winding effect is excessive because only the amount corresponding to the correction amount of the plate is added with the correction operation. There is no need for operation, and it is possible to perform stable meandering correction of the steel strip on the entry side and the exit side of the turn roll, and to provide a compact and inexpensive steering method and steering device for the steel strip. Etc. can be provided, it exhibits the industrially useful remarkable effect.

  The best mode for carrying out the invention will be described in detail with reference to FIGS.

  FIG. 1 is a diagram illustrating a conventional transfer effect type steel strip steering device, and FIG. 2 is a diagram illustrating the operation of the transfer effect type steering device.

  1 and 2, 1 is a steel strip, 2 is a turn roll, and 3 is a hydraulic cylinder.

  As shown in FIG. 1, the steel strip 1 is wound from one side (entry side) of the turn roll 2, turned 180 degrees by the turn roll 2, and discharged from the exit side. At this time, when the steel strip 1 is shifted from the center of the line to an eccentric position, the hydraulic cylinder 3 is operated to tilt the turn roll 2 in a direction perpendicular to the steel strip surface on the entry side. Correct the meandering of belt 1.

  For example, as shown in FIG. 2 when the turn roll is viewed from the side, when the deviation occurs in the WS at the entrance side plate center, the turn roll is set around the turn roll rotation axis set at the line center on the steel strip entrance side. , The WS is lowered, and the DS is raised so that the lower surface of the turn roll moves to the DS side, so that the exit side plate center and the line center can coincide with each other.

  However, in this case, since the turn roll rotation axis is set at the line center on the steel strip entry side, the deviation of the entry side steel strip cannot be corrected as it is.

That is, the conventional transfer effect type steel strip steering device shown in FIGS. 1 and 2 has the following characteristics.
Advantage: Since the steel strip is directly transferred, it is responsive.

Since no tension difference is generated in the steel strip, it is difficult for the steel strip to be stretched.
Disadvantages: Deviation of the steel strip inside the roll and inside the roll cannot be corrected.

      It is difficult to use except for 180 degree winding.

  FIG. 3 is a diagram illustrating a conventional spooling effect type steel strip steering device, and FIG. 4 is a diagram illustrating the operation of the spooling effect type steering device.

  3 and 4, 1 is a steel strip, and 2 is a turn roll.

  As shown in FIG. 3, the steel strip 1 is wound from one side (entry side) of the turn roll 2, turned 180 degrees with the turn roll 2, and discharged from the exit side. At this time, when the steel strip 1 is deviated from the center of the roll, the steel strip 1 is meandered by tilting the turn roll 2 in a horizontal direction with respect to the steel strip surface on the input side by a motor or the like. Correct it.

  For example, as shown in FIG. 4 when the turn roll is viewed from the upper surface, when the center of the entrance side plate has a deviation in WS, for example, the turn roll is a steel strip around the turn roll rotation axis set in DS. By inclining in the parallel plane and moving WS away from the steel strip entry side, a misalignment between the roll and the steel strip causes a bobbin effect that moves the steel strip in the DS direction. The strip can walk to the DS with respect to the turn roll and the steel strip center and the line center can coincide.

  FIG. 5 is a diagram for explaining the principle of a conventional spooling effect type steel strip steering device.

  As shown in FIG. 5, when the steel strip has an angle with respect to the roll, when the roll is rotated, the steel strip moves on the roll so that the yarn is wound. The relative movement between the steel strip and the roll is called the bobbin effect.

The conventional transfer effect type steel strip steering device shown in FIGS. 3 and 4 has the following characteristics.
Advantage: It is difficult to roll out because the steel strip is straightened to the center of the roll.

It can be used other than 180 degree winding.
Disadvantages: Poor response compared to transfer effect type.

      Responsiveness varies with line feed speed.

      Since a difference in tension occurs in the steel strip during correction, it is easy to extend the ear.

  6 is a perspective view illustrating an embodiment of a steel strip steering device according to the present invention, and FIG. 7 is a plan view thereof.

  6 and 7, 1 is a steel strip, 2 is a turn roll, 3 is a hydraulic cylinder (roll moving means), 4 is a moving frame, and 5 is a meandering detecting means.

  The steel strip steering method of the present invention is a steel strip steering method for correcting the meandering of the steel strip 1 by moving a turn roll 2 around which the steel strip 1 is wound, and is parallel to the steel strip 1 on the entry side. By providing a virtual fulcrum P in the plane and moving the turn roll 2 around which the steel strip 1 is wound in an arc shape centering on the virtual fulcrum P in a plane parallel to the steel strip 1, the steel It is characterized in that both a transfer effect for correcting the steel strip center of the belt and the line center to coincide with each other and a bobbin effect for correcting the roll center of the turn roll so as to match the steel strip center are generated simultaneously. .

  In FIG. 6, when a deviation occurs in the position of the steel strip 1 in the plate width direction and the meandering detecting means 5 detects this, the hydraulic cylinder 3 (roll moving means) is operated to correct the steel strip 1 around the line. Move the turn roll 2 horizontally. Due to the horizontal movement, the deviation on both the entry side and the exit side of the steel strip can be corrected.

  When the hydraulic cylinder 3 (roll moving means) is operated to move the turn roll 2 horizontally so that the steel strip 1 is corrected to the center of the line, a virtual fulcrum P provided in a plane parallel to the steel strip 1 on the entry side. By moving the turn roll 2 in an arc shape around the center, the roll center is inclined with respect to the right angle of the line during the correction operation, and a pin winding effect toward the roll center is generated on the plate.

  The turn roll 2 is fixed to the moving frame 4, and the turn roll 2 can be moved horizontally together with the moving frame 4 by pushing the moving frame 4 with a hydraulic cylinder 3 (roll moving means).

  When the turn roll 2 moves horizontally, a guide mechanism fixed to a fixed frame (not shown) limits the trajectory of the turn roll 2, so that the turn roll 2 is centered on the virtual fulcrum P in a plane parallel to the steel strip 1. Therefore, the side of the turn roll 2 on which the steel strip is biased becomes far from the steel strip entry side, the above-described bobbin winding effect occurs, and the steel strip 1 moves toward the center of the turn roll 2.

  As the steel strip 1 moves, the turn roll 2 returns to the center of the line.

  As described above, the steering apparatus shown in FIGS. 6 and 7 uses the method of moving the circular arc shape having the virtual fulcrum P in the plane parallel to the steel strip 1, so that the steering that cannot be corrected conventionally is used. Stable meandering correction on the entry side and exit side of the device is possible, and it is possible to handle both the top and bottom plates with the same structure, and the wrapping angle is not limited to 180 degrees. Can be applied to rolls.

  In other words, by moving the turn roll in the direction opposite to the bias in the direction perpendicular to the line in the direction perpendicular to the line, the object which has been corrected only by the twisting operation in the past has been obtained. At the same time as the modification, the board on the entry side can be modified.

  Thereby, the plate moves the roll in the direction opposite to the bias, and the turn roll itself returns to the center position of the line accordingly.

  Further, by making the virtual fulcrum P at a position 10 m or more away from the central axis of the turn roll 2 in the steel strip entrance direction, the steel band straightening operation due to the bobbin winding effect is moderated and the turn roll 2 is moved horizontally. By mainly performing the correction operation of the steel strip due to the accompanying transfer effect, it is possible to prevent hunting due to an excessive bobbin effect and become uncontrollable, and to realize stable correction of the steel strip.

  In the present invention, the method of the meandering detection device 5 is not limited, but a method of detecting an edge portion in the width direction of the steel strip by an optical detection means such as a CCD is preferable.

  As shown in FIG. 7, the meandering detection means 5 installed on the exit side of the steel strip 1 always checks whether the steel strip is located at the center of the line. When a deviation of 50 mm occurs, the signal is sent to the control unit, a command is issued to the hydraulic unit, and the hydraulic cylinder 3 (roll moving means) moves 50 mm in WS, which is the direction to correct the steel strip 1 to the center of the line. In the plane parallel to the steel strip 1, the turn roll 2 moves in an arc shape around the virtual fulcrum P set in front of the entrance side of the steel strip 1, so that an inclination is generated, so that the plate is centered on the roll. The going spool effect occurs.

  8 and 9 are views for explaining the operation of the steel strip steering device according to the present invention.

  8 and 9, 1 is a steel strip, 2 is a turn roll, 3 is a hydraulic cylinder (roll moving means), 5 is a meandering detecting means, 6 is a guide mechanism, 7 is a bearing, 9 is a fixed frame, and 10 is a support. Indicates a roller.

  First, as shown in FIG. 8 (a), when the meander detection means 5 detects that the deviation in the WS direction has occurred in the steel strip 1, the steel strip 1 becomes the center of the line as shown in FIG. 8 (b). Thus, the turn roll 2 is moved laterally from WS to DS by the hydraulic cylinder 3 (roll moving means).

  At that time, the turn roll 2 is formed in an arc shape centering on a virtual fulcrum P in a plane parallel to the steel strip on the entry side by a guide mechanism that is inclined to the left and right with respect to the line. Move and tilt.

  Next, as shown in FIG. 9 (c), a force that causes the steel strip 1 to move toward the center of the turn roll 2 is generated by a bobbin winding effect that occurs when the turn roll 2 is tilted.

Then, as the steel strip 1 moves toward the center of the turn roll, the turn roll 2 returns to the center of the line. During this time, the steel strip 1 is kept at the center of the line.
As described above, the steering device of the present invention shifts the roll in the correction direction in parallel with the steel strip 1 with respect to the turn roll 2 at the time of correcting the deviation, and at the same time, a guide mechanism such as a slide guide installed at an angle. By moving up and making it move close to an arc having a virtual fulcrum P on the far side of the entry side, the meandering can be corrected by walking the steel strip in the roll center direction.

  FIG. 10 is a view for explaining the concept of the steel strip steering device according to the present invention.

  As shown in FIG. 10 (a), as a model of the structure of the steering device of the present invention, a bearing 7 fixed to the moving frame 4 and the bearing 7 are in a plane parallel to the steel strip 1 on the entry side. The guide mechanism 6 is configured to guide the virtual fulcrum P so as to move in an arc shape.

  This guide mechanism is fixed to a fixed frame (not shown) and may be a pin inserted in a guide groove as shown in FIG. 10 (a). A slider as described below is a slide guide that moves on the rail. Something like that.

  As shown in FIG. 10 (a), the guide mechanism 6 is arranged so as to be inclined in the shape of a letter C to the left and right with respect to the line when the hydraulic cylinder 3 (roll moving means) is moved laterally. The reason for supporting the moving frame 4 on which the moving frame 4 is installed by the bearing 7 from the moving frame is to absorb the change in the angle between the guide mechanism 6 and the moving frame 4 that occurs during the rotating operation. .

  As shown in FIG. 10 (b), when the moving frame 4 is moved laterally, the bearing 7 moves along the inclination of the guide mechanism 6 and moves so that the entire moving frame 4 is inclined, and performs a virtual arc motion. At this time, an angular displacement is generated in the guide mechanism 6 and the moving frame 4 by an amount corresponding to the inclination of the moving frame 4.

  11 to 14 are views showing an embodiment of a steel strip steering device according to the present invention. FIG. 11 is a plan view, FIG. 12 is a side view, and FIGS. 13 and 14 are detailed views of a sliding portion of the steering device. It is.

  Specifically, FIG. 12, FIG. 13 and FIG. 14 respectively show the A arrow view, the B arrow view of FIG. 11, and the C arrow views of FIG. 12 and FIG.

  11 to 14, 2 is a turn roll, 3 is a hydraulic cylinder (roll moving means), 4 is a moving frame, 7 is a bearing, 8 is a slide guide, 9 is a fixed frame, 10 is a receiving roller, and 11 is a positioning pin. , 12 is a base plate, 13 is an intermediate base, 14 is a long hole, 15 is a mounting bolt, 16 is an adjusting screw, 17 is a slider, and 18 is a rail.

  The turn roll 2 is fixed to the moving frame 4 and moves in the direction perpendicular to the line by the hydraulic cylinder 3.

As shown in FIG. 13, the structure of the movable frame 4 on the pulling side in the loaded state is fixed to the slider 17 of the slide guide 8 via the bearing 7 and the intermediate base 13, and the slide guide 8 is fixed to the fixed frame 9 via the base plate 12. Fixed to.
At the center of the base plate 12, a positioning pin 11 is installed between the base plate 12 and the fixed frame 9, and the center position during angle adjustment is fixed.
The structure on the pressing side in the loaded state is supported by the receiving roller 10, and the receiving roller 10 also has an angle adjustment mechanism similar to that of the slide guide 8.

  11 to 14, the moving frame 4 on which the turn roll 2 is installed is guided so as to move in an arc shape around a virtual fulcrum P in a plane parallel to the steel strip. The guide mechanism 6 in FIG. 10 is a slide guide 8 including a slider 17 that travels on a rail 18, and a bearing 7 is installed on the slide guide 8.

  The guide mechanism 6 in FIGS. 8 to 10 may be the simplest guide groove and a pin that moves in the guide groove. However, as shown in FIGS. 13 and 14, the rail 18 and the slider that slides on the rail are used. By installing the slide guide 8 composed of 17 on the base plate 12 fixed to the fixed frame 9, a stable arc motion can be realized, and generated by the bearing 7 installed on the upper portion of the slider 17 during the rotational operation. The angle change between the slide guide 8 and the moving frame 4 can be absorbed.

  Further, as shown in FIG. 14, by providing a plurality of elongated holes in the base plate 12 for attaching the slide guide 8 to the fixed frame 9, the position of the mounting bolt 15 for attaching the base plate 12 is adjusted by turning the adjusting screw 16. Thus, the radius of the arc centered on the virtual fulcrum P can be set.

  As described above, according to this embodiment, by installing the slide guide 8 for moving the turn roll 2 at an angle, an operation close to an arc having the virtual fulcrum P is realized, and the roll is shifted by the correction operation. In this case, it is possible to change the alignment property of the plate by realizing an operation for causing the plate to exhibit a thread winding effect toward the center of the roll and adjusting the angle of the slide guide.

  In addition, by providing an adjustment function to the slide mechanism for realizing the virtual arc, it is possible to adjust the cylinder correction amount when correcting meandering.

  Moreover, as a structural advantage, in the conventional steering device, it is indispensable to arrange a swing fulcrum at the center of the line in order to realize a swing operation, and a complicated and excessive frame including a tension support structure is required. With this structure, it can be composed of two upper and lower frames, a slide guide, a rotation fulcrum, and a receiving roller, making it possible to make the structure compact and inexpensive, enabling pre-assembly during installation and shortening on-site work. It was.

  Furthermore, in the conventional type, it was necessary to change the structure depending on the direction of the path, but in this method, the same structure can be applied to either the upper or lower plate.

  In addition, the conventional operation requires a space for the roll to swing above and below the steering device. However, since this mechanism operates in parallel with the plate, it can be installed in a narrow space between paths.

  Further, by adjusting the angle of the slide guide, the tilt amount of the roll when the turn roll is shifted by the bias correcting operation can be changed, and the alignment of the apparatus can be adjusted.

  Note that the side opposite to the slide guide 8 of the turn roll 2 is configured to be supported by the receiving roller 10 in consideration of the necessity of guiding and absorption of angular displacement during the arc operation.

  Further, the positioning pins 11 can be used to specify the center position where the base plate 12 is installed.

  As a result of the trial operation when the steering device of the present invention is started up, when the distance between the fulcrums of the slide guide is 2400mm and the guide is tilted by 1.5 ° (virtual fulcrum radius: 45.3m), the cylinder stroke end when passing through the welding point (130mm), an additional deviation of about 100mm occurred, but after adjusting the guide tilt from 1.5 ° to 5 ° (virtual fulcrum radius: 13.3m), the cylinder deviation is about ± 50mm when passing through the welding point. The strip deviation is always in the range of 0.

  In general, the steel strip has some wrinkles, and during normal sheeting using this device, there is almost no corrective action with the cylinder deviation corresponding to the length of the steel strip (about 30 mm). It was confirmed that the plate could be passed stably.

  The steel strip steering method and steering apparatus according to the present invention can be applied not only to a 180-degree turn roll, but also to a turn roll having an arbitrary winding angle, and since the installation space is compact and inexpensive, the meander correction of the steel strip is possible. Can be widely applied to steel strip production lines that require

It is a figure which illustrates the steering device of the conventional transfer effect type steel strip. It is a figure explaining operation | movement of the steering apparatus of the conventional transfer effect type steel strip. It is a figure which illustrates the steering device of the conventional pincushion effect type steel strip. It is a figure explaining operation | movement of the steering device of the conventional pincushion effect type steel strip. It is a figure explaining the principle of the steering device of the conventional thread winding effect type steel strip. It is a perspective view which illustrates an embodiment of a steel strip steering device in the present invention. It is a top view which illustrates embodiment of the steering device of the steel strip in this invention. It is a figure explaining operation | movement of the steering apparatus of the steel strip in this invention. It is a figure explaining operation | movement of the steering apparatus of the steel strip in this invention. It is a figure explaining the view of the steering device of the steel strip in this invention. It is a top view which shows the Example of the steering apparatus of the steel strip in this invention. It is a side view which shows the Example of the steering apparatus of the steel strip in this invention. It is detail drawing of the slide part of the steering device of the steel strip in this invention. It is detail drawing of the slide part of the steering device of the steel strip in this invention.

Explanation of symbols

1 Steel strip 2 Turn roll 3 Hydraulic cylinder (roll moving means)
4 Moving frame 5 Meander detection means 6 Guide mechanism 7 Bearing 8 Slide guide 9 Fixed frame 10 Receiving roller 11 Positioning pin 12 Base plate 13 Intermediate base 14 Long hole 15 Mounting bolt 16 Adjustment screw 17 Slider 18 Rail P Virtual fulcrum

Claims (6)

In a steel strip production line, a steel strip steering method for correcting meandering of a steel strip by moving a turn roll wound with a steel strip,
By providing a virtual fulcrum in a plane parallel to the steel strip on the entry side, and moving the turn roll wound around the steel strip in an arc shape centering on the virtual fulcrum in a plane parallel to the steel strip The transfer effect for correcting the steel strip width direction center (steel strip center) and the line center to coincide with each other, and the body length direction center (roll center) of the turn roll to match the steel strip center. A steel strip steering method characterized by generating both a pincushion effect to be corrected.   2. The steel strip steering method according to claim 1, wherein the virtual fulcrum is located at a position separated by 10 m or more from the central axis of the turn roll in the steel strip entrance side direction.   The steel strip steering method according to claim 1 or 2, wherein a winding angle of the steel strip around a turn roll is set to 180 degrees. In the steel strip production line, a steel strip steering device for correcting meandering of the steel strip by moving a turn roll wound with the steel strip,
A roll moving means for moving a turn roll wound with a steel strip in a direction perpendicular to the line in a plane parallel to the steel strip on the input side, and a plane parallel to the steel strip on the input side when the turn roll moves And a guide mechanism for guiding the turn roll so as to move in an arc shape around a virtual fulcrum at the center.   The steel strip steering apparatus according to claim 4, wherein the guide mechanism is a slide guide including a slider that travels on a rail attached to a fixed frame via a base plate. The base plate for attaching the slide guide to the fixed frame of the guide mechanism is provided with a plurality of elongated holes, whereby the position of the bolt for attaching the base plate can be adjusted to set the radius of the arc centered on the virtual fulcrum. The steel strip steering device according to claim 5.

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