JP2011161467A - Leading guide for rolled stock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve and uniformize the accuracy of products by performing exact leading. <P>SOLUTION: A leading guide for a rolled stock includes: a pair of roller holders 7 which is provided in an openable and closable manner on a guide box 2 provided movably on a base 1, the roller holders 7 having guide rollers 5 attached thereto; a front-and-rear positions adjusting mechanism 8 for adjusting the positions of the guide rollers 5 so as to advance and retreat relative to rolling rolls R1, R2 through the guide box; a vertical positions adjusting mechanism 9 for adjusting the positions of the guide rollers 5 in the vertical direction through the guide box; and a center-to-center distance adjusting mechanism for adjusting the center-to-center distance of the guide rollers 5. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a guide for rolling material that can cope with a size change of the rolling material.

The present applicant has proposed a guide device for a flat steel rolling mill described in Japanese Utility Model Publication No. 62-123308 as a guide for rolling material.
As shown in FIGS. 1 to 3, the guide device includes a pair of upper and lower upper roller holders that are pivotably supported around a fulcrum pin in a guide box and the guide roller is vertically supported. And the lower roller holder, the guide member of the entry guide that is fixed inside the upper roller holder and the lower roller holder and forms one cylindrical body, and the upper roller holder is moved up and down to increase the height of the hole shape. A vertical dimension adjusting means having an up / down adjustment screw for adjusting and adapting to a change in the vertical dimension of the rolled material, an eccentric shaft and a rotation transmission mechanism for adjusting the width of the hole shape to the thickness of the rolled material Is provided with a thickness adjusting means.

Japanese Utility Model Publication No. 62-123308

The guide device is a technique corresponding to a case where flat steel is rolled (the flat steel is rolled in the longitudinal direction), and the upper roll is moved in the vertical direction while the lower roll of the rolling mill is fixed. This is an effective technique for changing the size of the rolled material.
However, in the size change of the other rolled material except the flat rolling of flat steel, when the size change is performed by moving the upper roll in the vertical direction with the lower roll fixed, there are problems to be solved as follows. Therefore, since it is impossible to sufficiently cope with the size change, it is necessary to improve the guide device.
The first problem is that the positions of the guide rollers and the entry guides in the vertical direction cannot be adjusted by centering according to the pass line after changing the rolling size.
This issue will be explained in detail. When carrying out multi-item small-volume production by sequentially changing the rolling size, it is necessary to frequently change the vertical size of the upper roll to change the rolling size. Only by moving the roller holder up and down, there is a limit in adjusting the position so that the rolled material always passes through the center of the guide roller in response to the change in the vertical position of the upper roll. In addition, when up-loop rolling or down-loop rolling is performed, the rolled material often generates up-and-down fluctuations, and the upper part is required to make the initial setting accurate so that the rolled material passes through the middle portion of the guide roller. It is not sufficient to move the roller holder up and down.
A 2nd subject cannot fully respond to this movement, when the upper roll accompanying change of rolling size moves as follows. That is,
When moving the upper roll upward, the pass line moves upward, so it is necessary to move the guide roller upward and forward, but only the vertical dimension adjustment means that moves the upper roller holder up and down. Then, it cannot cope with the above-mentioned change.
Further, when the upper roll is moved downward, it is necessary to move the guide roller downward and rearward in order to avoid the upper roll from colliding with the guide roller. It is not possible to cope with the downward movement by itself.
An object of the present invention is to improve the product accuracy and make the accuracy uniform by appropriately guiding the rolled material so that it can sufficiently cope with the change of the rolling size.

A first feature of the guide for rolling material according to the present invention is that a guide box provided on a base is movably provided, a pair of roller holders provided on the guide box so as to be openable and closable, and a pair of roller holders. A guide roller mounted on the tip side with a roller pin as a rotation center, a front-rear position adjustment mechanism for adjusting the position of the guide roller so as to be able to advance and retreat with respect to the rolling roll via the guide box, and the guide roller A vertical position adjusting mechanism for adjusting the position of the two in the vertical direction via the guide box, and a center adjusting mechanism for adjusting the center between the two guide rollers.
The second feature of the guide for rolling material according to the present invention includes the first feature, and the main body of the guide box is arranged to be movable up and down in the outer box portion and in the outer box portion. The roller holder is supported by the inner box portion, and the front / rear position adjusting mechanism is provided horizontally on the base, and the horizontal adjustment shaft is formed on the horizontal adjustment shaft. A slide bracket coupled to the guide box and connected to the guide box; and a transmission means for transmitting a driving force to the horizontal adjustment shaft. The vertical position adjustment mechanism is provided on the inner box portion of the guide box. A screw bearing portion provided; a vertical adjustment shaft screwed to the screw bearing portion; and a transmission means for transmitting a driving force to the vertical adjustment shaft. In that the structure is provided with a slide bracket is provided on each roller holder, a core gap adjusting shaft which is screwed into the slide bracket, and a transmission means for transmitting the driving force to the core between the adjustment shaft.

  According to the present invention, the position of the guide roller can be adjusted from multiple directions by the front-rear position adjustment mechanism, the vertical position adjustment mechanism, and the center-to-core adjustment mechanism. Therefore, it is possible to improve the product accuracy of the rolled material, particularly flat steel, and make the accuracy uniform.

It is a front view which shows the induction | guidance | derivation guide of the rolling material which concerns on this invention, Comprising: It is a figure which shows a principal part in cross section. It is a front view which shows the induction | guidance | derivation guide of the rolling material which concerns on this invention. It is a rear view which shows the induction | guidance | derivation guide of the rolling material which concerns on this invention. It is a top view which shows the induction | guidance | derivation guide of the rolling material which concerns on this invention. It is a side view which shows the induction | guidance | derivation guide of the rolling material which concerns on this invention. It is a partially cutaway side view showing a guide for rolling material according to the present invention, and is a view showing a vertical position adjusting mechanism. It is a bottom view which shows the bottom part of the induction | guidance | derivation guide of the rolling material which concerns on this invention. It is sectional drawing which shows the center adjustment mechanism in the induction | guidance | derivation guide of the rolling material which concerns on this invention.

An embodiment of the present invention will be described with reference to the drawings.
The guide for rolling material shown in FIGS. 1 to 5 is provided with a base 1, a guide box 2 disposed on the base, and a guide roller having a roller pin 6 as a rotation center at the tip. A pair of roller holders 7 to which 5 is attached, a front / rear position adjusting mechanism 8 for adjusting the position of the guide roller 5 back and forth along the rolling line through the guide box, and a position of the guide roller 5 through the guide box in the vertical direction A vertical position adjusting mechanism 9 for adjusting the distance between the guide rollers and a distance adjusting mechanism 10 (FIG. 8) for adjusting the distance between the centers of the guide rollers.

1 to 5, a guide box 2 forms a main body by combining a rectangular tubular outer box portion 3 and an inner box portion 4. An inner box 4 is arranged in the outer box 3 so as to be movable up and down. The inner box portion 4 is formed with a pair of guide protrusions 4a that are long in the vertical direction in order to make the vertical movement smooth on both side surfaces. As shown in FIGS. 2 and 6, the guide protrusions 4 a on both sides are fitted in guide grooves 3 a opened on both side surfaces of the outer box part 3 so as to be movable up and down. The inner box portion 4 is fixed to the outer box portion 3 by a fixing device to prevent the play.
According to the example shown in FIGS. 1 and 4, the fixing device includes a clamp 11, a clamp bolt 12, and an engagement groove 13. The clamp 11 is formed in a front trapezoidal shape, and is connected to the tip end portion (lower end portion in FIG. 1) of the clamp bolt 12 that is arranged on the outer box portion 3 with a space in the vertical direction in FIG. Each clamp bolt 12 is screwed into the outer box portion 3, the tip portion protrudes toward the inner box portion 4, and the protruding end and the clamp 11 are connected. The clamp 11 is locked in an engagement groove 13 formed on the inner box portion 4.
For this reason, the clamp 11 is locked or unlocked in the engaging groove 13 by turning the clamp bolt 12, and the inner box portion 4 is fixed or released from the outer box portion 3.

A front / rear position adjusting mechanism 8 for adjusting the position of the guide roller 5 in the front / rear direction will be described with reference to FIGS. 1, 2, 6, and 7.
The front-rear position adjustment mechanism 8 includes a horizontal adjustment shaft 14, gears 15 and 18, an operation shaft 16 that also serves as a drive shaft, and a slide bracket 17.
As shown in FIG. 1, the horizontal adjustment shaft 14 is rotatably supported in a horizontal state by a bearing portion 1a in the base 1, and a gear 15 is attached to the rear end portion (right end portion).
Further, the operation shaft 16 is arranged in a direction intersecting with the horizontal adjustment shaft 14 (vertical direction in FIG. 7). A gear 18 meshing with the gear 15 is attached to the front end portion of the operation shaft 16, and the rear end portion projects outward from the base 1.
Further, the horizontal adjustment shaft 14 passes through a slide bracket 17 that can move into a storage recess 1 b opened in the base 1. The male screw portion of the horizontal adjustment shaft 14 is screwed into the female screw portion of the slide bracket 17. As shown in FIG. 1, the slide bracket 17 is connected to a moving body 3 b attached to the bottom of the outer box portion 3 of the guide box 2.
For this reason, in the front-rear position adjusting mechanism 8, when the operating shaft 16 is driven to rotate, the rotational force is transmitted to the horizontal adjusting shaft 14 through the gears 18 and 15, so that the slide bracket 17 is moved along the rotation of the horizontal adjusting shaft. 1 Move in the left-right direction (front-rear direction), and by this movement, the position of the guide box 2 moves in the front-rear direction along the rolling line via the moving body 3 b of the outer box portion 3. As the guide box 2 moves back and forth, the guide roller 5 moves back and forth (approaches or retracts) with respect to the rolling rolls (upper roll R1 and lower roll R2) through the roller holder 7.
As shown in FIGS. 2, 6 and 7, both sides (left and right sides in FIG. 6) of the movable body 3b of the outer box portion 3 are sandwiched by clamps 60 which are arranged so as to face each other. Is retained. The movable body 3b is held or released from the base 1 through operation by the rotation of the clamp bolt 61.

A vertical position adjusting mechanism 9 for adjusting the position of the guide roller 5 in the vertical direction through the guide box 2 will be described with reference to FIGS. 1, 2, and 4 to 6.
The vertical position adjusting mechanism 9 includes screw bearing portions 19 and 20, guide shafts 21 and 22, vertical adjustment shafts 23 and 24, transmission gears 25 and 26, transmission shafts 27 and 28, transmission gears 29, 30, 31, and 32, and a driving gear. 33 and 34 and an operation shaft 35 that also serves as a drive shaft.
As shown in FIGS. 1 and 6, a pair of cylindrical screw bearing portions 19 and 20 are embedded in the vertical direction inside the both sides of the inner box portion 4 of the guide box 2. Guide shafts 21 and 22 made of bolts standing from the bottom of the outer box 3 are inserted into the screw bearings 19 and 20. The vertical adjustment shafts 23 and 24 are attached to the upper portion of the outer box portion 3 in a penetrating manner, and a male screw portion is formed at the tip portion. The male screw portions of the vertical adjustment shafts 23 and 24 are connected to the distal end portions of the guide shafts 21 and 22 through connection members, and are screwed into the female screw portions of the screw bearing portions 19 and 20. Transmission gears 25 and 26 are attached to the upper ends of the vertical adjustment shafts 23 and 24, respectively.
As shown in FIGS. 2, 4 and 6, a pair of transmission shafts 27 and 28 located on the same axis line are arranged oppositely on the left and right sides of FIG. 4 above the outer box portion 3 of the guide box 2. And supported by bearings 36 and 37. The transmission shafts 27 and 28 rotate in opposite directions. Transmission gears 29 and 30 and transmission gears 31 and 32 are attached to both ends of the pair of transmission shafts 27 and 28. The outer transmission gears 29 and 31 mesh with the transmission gears 25 and 26 of the vertical adjustment shafts 23 and 24. The inner transmission gears 30 and 32 mesh with drive gears 33 and 34 attached to an operation shaft 35 that also serves as a drive shaft. The operation shaft 35 is horizontally supported by bearing portions 38 and 39 provided on the outer box portion 3 of the guide box 2.
Therefore, in the vertical position adjusting mechanism 9, when the operation shaft 35 is driven to rotate, the inner transmission gears 30 and 32, the transmission shafts 27 and 28, and the outer transmission gears whose rotational force meshes with the drive gears 33 and 34. 29 and 31 and the transmission gears 25 and 26 are transmitted to the vertical adjustment shafts 23 and 24, so that the inner box portion 4 moves in the vertical direction in FIG. 1 through the screw bearing portions 19 and 20 as the vertical adjustment shaft rotates. By this movement, the position of the guide roller 5 moves up and down through the roller holder 7.

A center adjustment mechanism 10 for adjusting the center of the guide roller 5 will be described with reference to FIGS. 1 to 5 and 8.
In the inner box portion 4 of the guide box 2, roller holders 7 are arranged on both the left and right sides in FIG. The slide brackets 40 and 41 protrude to the front side (left side in FIG. 1) of the upper end surfaces of the roller holders 7, and the slide brackets are provided opposite to each other on the left and right in FIG. Slide brackets 42 and 43 project from the front side (left side in FIG. 1) of the lower end surfaces of both roller holders 7, and these slide brackets are provided opposite to each other on the left and right in FIG. A slide bracket similar to the slide brackets 42 and 43 (only the slide bracket 44 is shown in FIG. 1) also protrudes on the rear side (right side in FIG. 1) of the lower end surfaces of both roller holders 7, and these slide brackets are located on the left and right sides in FIG. It is provided oppositely.
In FIGS. 1 and 8, center adjustment shafts 45, 46, 47 are provided in a horizontal state on the upper front side and the lower front and rear sides of both roller holders 7. The upper center-to-core adjustment shaft 45 is rotatably supported by a bearing portion 4 b provided in the inner box portion 4.
The lower center-to-core adjusting shafts 46 and 47 are rotatably supported by bearing portions (only the bearing portion 4c located on the front side is shown) provided in the inner box portion 4. On both sides of the upper and lower inter-core adjustment shafts 45, 46 and 47, there are male screw portions (in FIG. 8, male screw portions 45a1 and 45a2 corresponding to the upper inter-core adjustment shaft 45 and lower inter-core adjustment shaft 46). The male thread portions 46a1 and 46a2 are shown). The male screw portions 45a1 and 45a2 of the upper inter-center adjustment shaft 45 which are in a reverse screw relationship are engaged with the female screw portions of the slide brackets 40 and 41, and the male screw portion 46a1 of the lower front inter-core adjustment shaft 46 which is in a reverse screw relationship. 46a2 meshes with the female threaded portions of the slide brackets 42 and 43, and the male threaded portion of the lower rear inter-core adjusting shaft 47 in a reverse screw relationship meshes with the female threaded portion of the slide bracket 44.
3 and 8, a transmission gear 48 is attached to one side of the upper center adjustment shaft 45, and transmission gears 49 and 50 are attached to both ends of the lower front center adjustment shaft 46, respectively. Transmission gears (only the transmission gear 52 on one side is shown in FIG. 3) are attached to both ends of the lower rear side centering adjustment shaft 47, respectively. As shown in FIGS. 2 and 8, a bearing portion 53 is provided on one side surface (left side surface in FIG. 8) of the inner box portion 4 of the guide box 2. A transmission shaft 54 is rotatably supported by the bearing portion 53. Transmission gears 55 and 56 are attached to the upper and lower ends of the transmission shaft 54. The transmission gears 55 and 56 mesh with the transmission gears 48 and 49 on one end side of the upper and lower inter-core adjusting shafts 45 and 46 on the front side (left side in FIG. 2), respectively. As shown in FIGS. 3 and 8, an operation shaft 57 that is a drive shaft is provided in a horizontal state in a direction intersecting with the inter-core adjustment shafts 46 and 47 at the bottom of one side of the outer box portion 3 of the guide box 2. . Drive gears 58 and 59 are attached to the operation shaft 57. One drive gear 58 meshes with the transmission gear 50 of the lower front inter-center adjustment shaft 46, and the other drive gear 59 meshes with the transmission gear 52 of the lower rear inter-core adjustment shaft 47.
For this reason, in the inter-center adjusting mechanism 10, when the operation shaft 57 is driven to rotate, the rotational force of the operating shaft 57 passes through the transmission gears 50 and 52 meshed with the drive gears 58 and 59, and the inter-center adjusting shafts 46 on the lower front and rear sides. , 47 (FIG. 3), and transmitted to the upper center adjustment shaft 45 via the transmission gears 49 and 56, the transmission shaft 54, the transmission gear 55 and the transmission gear 48 (FIG. 8). Both the center adjustment shafts 45, 46, 47 rotate synchronously (FIG. 1), and the roller holders 7 on the left and right of FIG. 8 face each other through the slide brackets 40, 41, 42, 43, 44 in accordance with these rotations. The position of the guide roller 5 is adjusted as a result of adjusting the position by approaching or separating (opening and closing) in the direction, and performing the position adjustment by such movement.
In FIG. 1, reference numeral “51” is an entry guide.

Next, a method for using the guide for rolling material according to the present invention will be described.
In order to achieve optimum guidance for the rolled material, the position of the guide roller 5 in multiple directions (up / down, front / rear, left / right) is adjusted. That is,
When adjusting the vertical position of the guide roller 5, the following method is used.
That is, as shown in FIGS. 1, 4 and 6, the operating shaft 35 is driven to rotate, and the rotational force is transmitted to the transmission gears 30, 32, 29, 31 on both the inner and outer sides, the transmission gears 25, 26, and the transmission shaft 27. , 28 to the vertical adjustment shafts 23, 24, the inner box portion 4 moves in the vertical direction in FIG. 1 through the screw bearing portions 19, 20 with the rotation of the vertical adjustment shaft. The position of the guide roller 5 is moved in the vertical direction, and the position is adjusted. The optimum position of the guide roller 5 is adjusted while adjusting the rotation amount of the operation shaft 35.
When the front / rear position adjustment of the guide roller 5 is performed, the following method is used.
That is, as shown in FIGS. 1, 6, and 7, when the operating shaft 16 is driven to rotate and the horizontal adjustment shaft 14 is rotated, the guide box 2 is moved in the left-right direction (front-rear direction) in FIG. The position of the guide box is moved in the front-rear direction by this movement, and the position of the guide roller in the front-rear direction with respect to the rolling rolls (upper roll R1 and lower roll R2) is adjusted. The optimum position of the guide roller 5 is adjusted while adjusting the rotation amount of the operation shaft 16. In the case of forward movement of the guide roller 5, the guide roller 5 is brought close to the rolling rolls R1 and R2, and in the case of backward movement, the guide roller is moved backward by a predetermined distance from the rolling roll.
The following method is used when adjusting the position between the cores, which is the lateral movement of the guide roller 5.
That is, as shown in FIGS. 2, 5, and 8, when the operation shaft 57 is rotationally driven and the lower and upper inter-core adjustment shafts 45, 46, 47 are synchronously rotated, along with these rotations Through the slide brackets 40 and 41 and the male screw portions 45a1 and 45a2, the slide brackets 42 and 43, the male screw portions 46a1 and 46a2, and the slide bracket 44, the roller holder 7 moves toward or away from each other in the opposite direction. 5 is adjusted. While adjusting the rotation amount of the operation shaft 57, the optimum center adjustment of the guide roller 5 is performed.

A specific center adjustment of the guide roller 5 will be described.
When changing the rolling size by fixing the lower roll R2, moving the upper roll R1 in the vertical direction, and adjusting the roll gap in the upper and lower rolls according to the required rolling material dimensions, the rolling material is a guide. Pass through the center of the roller 5.
Since the pass line moves in the vertical direction with the adjustment of the roll gap in the rolling rolls (upper roll R1 and lower roll R2), in addition to adjusting the center of the guide roller 5 by the operation shaft 57 in accordance with this movement. The position of the guide roller is adjusted in one direction in the vertical direction or in two directions in the vertical direction and the front-rear direction.
For example, when the upper roll R1 is moved upward, the position of the roller holder 7 is moved upward while adjusting the rotation amount of the operation shaft 35 in accordance with the roll gap, and the guide roller 5 is moved upward. Adjust the position.
Thereafter, while adjusting the rotation amount of the operation shaft 57, the roller holders 7 are moved toward or away from each other in the opposite direction, and the optimum center adjustment of the guide roller 5 is performed by this movement.
Moreover, if the position adjustment by the vertical movement of the guide roller 5 and the center adjustment by the left-right movement alone are not sufficient due to the change in the width of the roll gap accompanying the movement of the upper roll R1 in the vertical direction, if the position adjustment is finally insufficient. , Need to adjust the front and back position of the guide roller.
After the change of the rolling size, for example, when the roll gap becomes wide, in addition to the position adjustment by the upward movement of the guide roller 5, when it is necessary to bring the guide roller closer to the rolling rolls R1 and R2, the guide roller is moved forward. The position must be adjusted. This forward movement advances the guide box 2 toward the rolling rolls R1 and R2 while adjusting the amount of rotation of the operation shaft 16, moves the guide roller close to the rolling roll, and adjusts the position of the guide roller optimally. .
On the contrary, when the roll gap becomes narrower with the downward movement of the upper roll R1, the pass line moves downward. Therefore, when the position adjustment is required by the downward movement of the guide roller 5, the guide roller is rolled. Since it is necessary to separate from the rolls R1 and R2, the position of the guide roller is adjusted to the rear.

  According to the illustrated guide for the rolled material, the positions of the roller holder 7 and the guide roller 5 can be adjusted in multiple directions. In other words, the position of the guide roller 5 is adjusted through the guide box 2 by the front-rear position adjusting mechanism 8. The guide roller 5 can be adjusted back and forth along the rolling line, and the position of the guide roller 5 can be adjusted in the vertical direction through the guide box 2 by the vertical position adjusting mechanism 9, and the guide roller can be adjusted by the inter-center adjusting mechanism 10. Since the distance between the cores of 5 can be adjusted, it is possible to sufficiently cope with the size change of the rolled material, and it is possible to optimally guide the rolled material. In particular, since the front / rear position adjusting mechanism 8 is provided, the roller holder 7 and the guide roller 5 can be brought close to the rolling rolls R1 and R2, and on the contrary, they can be retracted by a necessary distance, so that the optimum guidance is possible. As a result, the product accuracy of the rolled material such as flat steel can be improved and the accuracy can be made uniform.

  The driving force transmission means from the operation shaft 35 to the vertical adjustment shafts 23 and 24 is not limited to that shown in FIGS. The operation shafts 16, 35, and 57 may be connected to a motor so as to be remotely operable.

R1 Upper roll (rolling roll)
R2 Lower roll (rolling roll)
DESCRIPTION OF SYMBOLS 1 Base 2 Guide box 3 Outer box part 3b Moving body 4 Inner box part 5 Guide roller 6 Roller pin 7 Roller holder 8 Guide roller longitudinal position adjustment mechanism 9 Guide roller vertical position adjustment mechanism 10 Guide roller center adjustment mechanism 14 Horizontal adjustment shaft 15 Gear (Transmission means)
16 Operation shaft 17 Slide bracket 18 Gear (Transmission means)
19, 20 Screw bearings 21, 22 Guide shafts 23, 24 Vertical adjustment shafts 25, 26 Transmission gear (transmission means)
27, 28 Transmission shaft (transmission means)
29, 30, 31, 32 Transmission gear (transmission means)
33, 34 Drive gear 35 Operation shaft 40, 41, 42, 43, 44 Slide bracket 45, 46, 47 Centering adjustment shaft 45a1, 45a2 Male thread part (transmission means)
46a1, 46a2 male screw part (transmission means)
49, 50 Transmission gear (transmission means)

Claims (2)

  A guide box movably provided on the base, a pair of roller holders provided on the guide box so as to be openable and closable, and a guide roller having a roller pin attached to the tip end side of the pair of roller holders as a rotation center A front-rear position adjusting mechanism for adjusting the position of the guide roller so as to be movable back and forth with respect to the rolling roll via the guide box; and for adjusting the position of the guide roller in the vertical direction via the guide box An induction guide for a rolled material, comprising a vertical position adjusting mechanism and a center adjusting mechanism for adjusting a center between the guide rollers. The main body of the guide box is formed by combining the outer box part and the inner box part arranged to be movable up and down in the outer box part,
The roller holder is supported by the inner box,
The front / rear position adjustment mechanism transmits a driving force to the horizontal adjustment shaft that is horizontally provided on the base, a slide bracket that is screwed to the horizontal adjustment shaft and connected to the guide box, and the horizontal adjustment shaft. Transmission means
The vertical position adjustment mechanism includes a screw bearing provided in the inner box portion of the guide box, a vertical adjustment shaft that is screwed to the screw bearing, and a transmission means that transmits a driving force to the vertical adjustment shaft. With
The center-to-center adjustment mechanism includes a slide bracket provided on each roller holder, a center-to-center adjustment shaft screwed to each slide bracket, and a transmission unit that transmits a driving force to the center-to-center adjustment shaft. The guide for rolling material according to claim 1.

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