JP2830005B2 - Hoop connection device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a hoop material connection device used for welding and connecting hoop materials when continuous supply of hoop materials is required.

Conventional technology Conventionally, electronic components such as lead frames for ICs, and thin plates (hoop materials) such as copper, copper alloys, and nickel steel, which are used as materials for precision equipment, are supplied to the pressing and punching processes. When this is done, it is usually supplied in a form called a hoop roll in which it is wound into a roll. However, it is needless to say that the hoop material is desirably supplied continuously without interruption from the viewpoint of improving the processing efficiency of these steps and eliminating waste of materials. Therefore, before these steps, a hoop material connection device (hereinafter, abbreviated as “connection device”) for butt-welding or lap welding opposing ends of the hoop materials has recently been frequently installed.

FIG. 4 is a view showing a vertical hoop material connecting device which is an example of a conventional connecting device. In this figure, the connection device SW
Reference numeral 1 denotes a cutting unit 1, a welding unit 2, a rolling unit 3, which are arranged in a row along a conveying direction (arrow Y1 in the figure) of a hoop material (not shown), and these three units are mounted. The welding machine body 4 is configured to be reciprocally movable in a direction substantially perpendicular to the transport direction Y of the welding machine.

In order to connect the hoop material using such a connection device SW1, first, when the hoop material is smoothly supplied to the pressing step or the like, the welding machine body 4 is moved, and The units 1 to 3 are removed from the center line C (hereinafter, abbreviated as “threading center”) along the longitudinal direction of the hoop material. That is, this is the normal position of the welding machine main body 4 in a state where the hoop material is being supplied.

Next, when the detection means (not shown) detects the end of the hoop coil during the supply of the hoop material, the supply of the hoop material is stopped, and connection with a new hoop coil is performed.

First, by moving the welding machine body 4, the units 1 to 3 are made to approach the vicinity of the passing center C.
Thereafter, the terminal end of the preceding hoop material that has been supplied so far is fixed on the cutting unit 1, and the cutting end of the preceding hoop material is cut and shaped. Subsequently, the starting end of a new hoop coil (following hoop material) connected to the preceding hoop material is fixed on the cutting unit 1 and cut and shaped.

Next, the leading hoop material and the succeeding hoop material are sent out onto the welding unit 2 by the worker M standing on the side of the welding machine body 4, and
Butt or lap welding is performed between the cut and shaped leading hoop material end and the trailing hoop material starting end. As a result, the leading hoop material and the trailing hoop material are connected at their ends, and a bulge is formed at the welded portion by a weld bead.

Then, the welded portion of the hoop material after the welding is sent to the rolling unit 3, and the raised portion formed in the welded portion is flattened by a roller or the like. With the above procedure, the connection of the hoop material by the connection device SW1 is completed.

On the other hand, FIG. 5 is a view showing a horizontal hoop material connecting device which is another example of the conventional connecting device. This connection device SW2 is
This is a configuration in which the units 1 to 3 are arranged side by side in the connection device SW1. That is, this connection device SW2
The cutting unit 11, the rolling unit 13, and the welding unit 12 are arranged along a direction (arrow Y3 direction in the figure) perpendicular to the hoop material transport direction (arrow Y3 direction in the figure) and away from the hoop material passing center C. , A unit base 14 on which these units 11 to 13 are mounted, and a welding machine body 15 for supporting the unit base 14 reciprocally in the arrow Y3 direction. I have.

In order to connect the hoop material using such a connection device SW2, first, when the hoop material is smoothly supplied to the pressing step or the like, the unit base 14 is moved, so that the cutting unit 11: Hoop material passing center C
Is placed in a position facing the. That is, this is the normal position of the unit base 14 in a state where the hoop material is being supplied.

Next, during the supply of the hoop material, when the end of the hoop coil is detected by the detection means (not shown), first, the terminal end of the preceding hoop material is fixed on the cutting unit 11, and the cutting and shaping of the preceding hoop material terminal portion is performed. Done. Subsequently, the starting end of the succeeding hoop material is fixed on the cutting unit 11 and cut and shaped.

Next, by moving the unit base 14, the preceding hoop material and the succeeding hoop material are sent onto the welding unit 12, and the cut end of the leading hoop material end portion and the trailing hoop material starting end portion are joined or wrapped. The welding is performed by an operator M standing on the side of the hoop material behind the unit base 14.

In the process of returning the unit base 14 to the above-described normal state, when the welded portion of the hoop material having been welded is positioned on the rolling unit 13, the rolling unit 13 is operated, and the raised portion formed in the welded portion is formed. Is flattened. With the above procedure, the connection of the hoop material by the connection device SW2 is completed.

In these conventional connection devices SW1 and SW2, the welding machine body 4 is provided with casters, rails and the like on its lower surface to be reciprocated manually,
The motor 14 is configured to be automatically reciprocated by being provided with a motor, an actuator and the like.

By the way, it is desirable that the connection device for connecting such a hoop material satisfies the following conditions in consideration of the installation environment and the like.

The main body of the machine is small and can be installed in a narrow space such as between press machines. The hoop material and the connecting device (particularly the welding unit ) Should not interfere with each other, and the connection of the hoop material should be easy and highly reproducible.

Looking at the connection devices SW1 and SW2 from such a viewpoint, these connection devices SW1 and SW2 have the following problems, respectively.

First, in the vertical connection device SW1, each unit 1
3 are arranged in a row along the hoop material transport direction Y1, so that the hoop material must be moved when moving between the steps of cutting → welding → rolling. It was very troublesome. In addition, each unit 1-3
In the case of the manual operation by the worker M, the space in which the arm of the worker M can enter must be secured on both sides of each of the units 1 to 3, which inevitably leads to an increase in the size of the entire apparatus. . Furthermore, since the welding machine main body 4 is configured to move manually, it is very difficult to position the units 1 to 3 on the passing center C, and the connection work of the hoop material is further complicated. Was a factor.

On the other hand, in the horizontal connection device SW2, since the hoop material and the cutting unit 11 are arranged at the same position during the passage, care must be taken so that the cutting unit 11 and the hoop material do not interfere with each other. You need to pay. Further, since the units 11 to 13 are arranged in a row in the direction Y3 orthogonal to the hoop material transport direction Y2, a large installation space is required in this direction, and this tends to inevitably increase the size of the apparatus. is there. Further, as shown in FIG. 5, since the position where the worker M stands is inclined with respect to the position where the joining operation of the hoop material is performed, for example, it is not possible to perform the work for preventing the burnout of both ends of the hoop material in the welding operation. , Its operability is very poor. For this reason, each of the units 11 to 13 is to be automated, but this automation of the units has caused a vicious cycle in which the entire apparatus is further enlarged.

In order to solve such a problem, the present applicant has previously proposed a connection device SW3 as shown in FIG. 6 (Japanese Patent Application No. 62-316510). In FIG. 6, the connection device SW3
Is generally composed of a cutting unit 21, a welding unit 22, a rolling unit 23, and a main body frame 24 on which these units 21 to 23 are mounted on the upper surface. Then, the hoop material 20 is conveyed so as to cross over the main body frame 24 along one side thereof (in the direction of arrow Y4 in the figure), that is, a band-shaped portion along the hoop material 20 on the upper surface of the main body frame 24 is The hoop material crossing portion 25 is defined by the hoop material 20. A band-like guide member 27a is attached along the transverse direction Y4 of the hoop material 20 to the side of the hoop material crossing portion 25 on the upper surface of the main body frame 24, and is separated from the guide member 27a by a predetermined distance. Parallel to the guide member 27b
Is attached. And these guide members 27
a, 27b, on the upper surface of the main body frame 24, each unit 21
The moving table 26 on which the to 23 are mounted is mounted. Also, casters (not shown) are provided on the bottom of the moving table 26.
The moving table 26 is configured to be movable along the guide members 27a and 27b, that is, along the transverse direction Y4 of the hoop member 20.

On the other hand, in the center of the hoop material crossing section 25,
Is provided. On the upper surface of the working unit 29, belt-like guide members 28, 28,... Are attached similarly to the guide members 27a, 27b.

The units 21 to 23 are not fixed to the moving table 26 but are mounted in a state of being sandwiched between the guide members 27a and 27b.
The hoop member 20 is arranged side by side so as to be movable along the transverse direction Y4, and the work unit 29 can be freely moved to the upper surface at a stage located behind the work unit 29. It is configured.

In such a bonding apparatus SW3, the respective units 21 to 23 are placed on the moving table 26 during the passing, that is, when the hoop material 20 is smoothly supplied to the pressing step and the like as shown in FIG. , The units 21 to 23 are removed from the hoop material passing center C.
This is the normal position of each of the units 21 to 23.

Next, when the detection means (not shown) detects the end of the hoop coil during the supply of the hoop material, the supply of the hoop material is stopped, and connection with a new hoop coil is performed. First, by moving the moving table 26 so that the cutting unit 21 faces the rear of the working unit 29, by moving the cutting unit 21 forward, as shown in FIG. Move up to Thereafter, the end of the preceding hoop material 20b that has been supplied so far is fixed on the cutting unit 21, and the end of the preceding hoop material 20b is cut and shaped. Subsequently, the starting end of the succeeding hoop material 20a connected to the preceding hoop material 20b is fixed on the cutting unit 21 and cut and shaped.

Next, after returning the cutting unit 21 onto the moving table 26, the moving table 26 is moved to the left so that the welding unit 22 faces the rear of the working unit 29, and the welding unit 22 is further moved forward. As a result, the work unit 29 is moved to the upper surface as shown in FIG. Then, butt welding or lap welding is performed between the cut end of the leading hoop material 20b and the starting end of the succeeding hoop material 20a, and the ends are connected together, and a bulge due to a welding bead is formed at a welding point. Is formed.

Further, after the welding unit 22 is returned on the moving table 26, the moving unit 26 is moved to the left so that the rolling unit 23 faces the rear of the working unit 29, and in this state, the rolling unit 23 is moved forward. Thus, as shown in FIG. Then, the raised portion formed at the welding location of the hoop material 20 after the welding is flattened by a roller or the like.

After that, the rolling unit 23 is returned to the moving table 26, and then the moving table 26 is moved to the right, so that the units 21 to 23 are arranged at the normal positions during the passage, and the connection of the hoop material 20 is performed as described above. Is completed.

[Problems to be Solved by the Invention] In the connection device SW3 described above, each unit 21 is moved while moving the moving table 26 left and right in accordance with the cutting, welding, and rolling operations in the connection operation of the hoop material 20.
23 to the work unit 29, and only need to be moved backward, so that the operability during the connection work can be improved, but it still has the following disadvantages.

Since the cutting, welding, and rolling units 21 to 23 are provided independently of each other, the width B '(see FIG. 6) of the entire apparatus becomes large, and a narrow space such as between press machines is used. The initial purpose of being able to be installed in a room cannot be sufficiently achieved.

Since a sliding guide mechanism must be provided for each of the units 21 to 23 so as to be able to move back and forth on the upper surface of the working unit 29, manufacturing costs increase.

The present invention has been made in view of the above-described problems, and it is possible to improve the operability of the connection operation and prevent interference between the hoop material in the passing plate and the device, and also reduce the width of the entire device. It is an object of the present invention to provide a hoop connection device which can be made as small as possible and which can realize a low production cost.

[Means for Solving the Problems] According to the present invention, opposing ends of two hoop materials are cut and shaped, and a raised portion formed at a welding portion between the two hoop materials is provided so as to be freely opened and closed. Cutting flattening means for pressing and flattening by a pair of rollers, welding means for abutting or lap welding each end of the both hoop materials cut and shaped by the cutting flattening means, and cutting flattening on an upper surface And a welding machine, and a hoop member crossing portion of the hoop member is provided, a main body frame having a working portion formed in a part of the hoop member crossing portion, and a hoop member of the main body frame. A moving table provided on the side of the crossing portion so as to be movable along the transverse direction of the hoop material, and having the cutting and flattening means and the welding means mounted thereon; The means and the welding means are respectively supported on the moving table so as to be movable in a direction intersecting the transverse direction of the hoop material, and the pair of rollers are rotatable along the moving direction of the cutting and flattening means. It is characterized by being supported by.

[Operation] According to the above configuration, a function of cutting and shaping opposing ends of the two hoop materials, and a pair of bosses formed at welding locations of the two hoop materials so as to be freely opened and closed. Since the function of flattening by pressing with a roller is integrated, and the cutting flattening means is configured, if the rollers are kept in contact, rolling can be performed by the same operation as moving the cutting means laterally, In addition, as the lateral width of the device, the width required to mount the cutting flattening means, the width required to mount the welding means, and the flattening when moving the welding means to the working section. It is only necessary to secure a dimension obtained by adding the width dimension necessary for retracting the means, and, as in the conventional case, when a cutting unit, a rolling unit, and a welding unit each separately configured are mounted. Compare with As a result, the width can be reduced, and only two sets of sliding guide mechanisms for movably supporting each unit are required.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

1 to 3 are views showing the configuration of a hoop material connecting device according to an embodiment of the present invention.

First, in FIG. 1, reference numeral SW denotes a hoop material connecting device, which cuts and shapes opposing ends of two loop materials, and freely opens and closes a ridge formed at a welding portion of these two hoop materials. A cutting and rolling unit (cutting and flattening means) 31 for flattening by pressing with a pair of rollers 40 and 41 provided in a pair, and a welding unit for butt-welding or lap-welding the respective ends of the cut and shaped hoop materials. (Welding means)
32 and a main body frame 33 on which the units 31, 32 are mounted.

The hoop material 20 is transported so as to cross over the main body frame 33 along one side thereof (in the direction of arrow Y shown in FIG. 1), that is, the hoop material on the upper surface of the main body frame 33.
The belt-like portion along 20 is a hoop material crossing portion 35. A fixing device 36 for fixing the terminal end of the preceding hoop material 20b when connecting the hoop material 20 is connected to the hoop material crossing portion 35.
And a fixing device 37 for fixing the starting end of the trailing hoop material 20a, and a working unit 39 is provided between these fixing devices 36 and 37.
Are formed.

Here, the configuration of the cutting and rolling unit 31 will be described with reference to FIG. 2 and FIG.

In these figures, 45 and 46 are two rails arranged on the side of the hoop material crossing portion 35 of the main body frame 33. On these rails 45 and 46, the hoop material 20 A sliding guide 47 movable in the direction is placed. A moving table 50 is mounted on the sliding guide 47 via two guide rails 48 and 49 extending in a direction orthogonal to the transverse direction of the hoop member 20.
Is movable in a direction orthogonal to the transverse direction of the hoop member 20. A plate-like frame 51 is provided vertically on the moving table 50, and a cutting mechanism 52 and a rolling mechanism 60 are attached to the frame 51.

The cutting mechanism 52 includes guide plates 53 and 54 vertically provided on the upper surface of the moving table 50 with a gap therebetween, and guide plates 53 and 54
In the gap of, is constituted by a shear 55 supported movably up and down, an air cylinder 56 and arms 57 and 58,
By driving the air cylinder 56, the arms 57, 58
Swings, the shear 55 is pushed down, and the end of the hoop material 20 is cut and shaped. A rolling mechanism 60 is provided in front of the cutting mechanism 52, that is, at a position adjacent to the hoop material crossing portion 35.

The rolling mechanism 60 includes a lower roller 40 rotatably supported between the guide plates 53 and 54, and a guide attached to the frame 51.
A holder 62 movably supported by 61 and a holder
The upper roller 41, which is rotatably supported at the lower end of
A bolt-shaped pressure adjusting knob 63 screwed into a female screw hole formed at the upper end of the frame, a spring 64 (see FIG. 3) for always pulling up the holder 62, and a toggle attached to the upper end of the frame 51. When the lever 66 of the toggle clamp mechanism 65 is pulled forward (to the right in FIG. 2) and pressed down, the rod 67 of the toggle clamp mechanism 65 moves downward, and the pressing force adjusting knob 63 is constituted. Down, so that the upper roller 41
Press against In this state, by moving the cutting and rolling unit 31, the raised portion formed in the welded portion of the hoop material 20 is pressed and flattened by the pair of rollers 40, 41.
In this case, the pressing force between the rollers 40 and 41 is adjusted by turning the pressing force adjusting knob 63 to change the distance between the rod and the lower end of the rod 67.

Next, as shown in FIG. 3, the welding unit 32 includes a sliding guide 77 movably mounted on the rails 45 and 46 along the transverse direction of the hoop material 20, and a sliding guide 77 The moving table 8 mounted on the hoop material 20 via two guide rails 78 and 79 extending in a direction orthogonal to the transverse direction of the hoop material 20.
0 and a welding device 81 provided on the moving table 80. The sliding guide 77 is connected to the sliding guide 47 of the cutting and rolling unit 31 via a connecting member (not shown), so that the welding unit 32 moves on the rails 45 and 46 in conjunction with the cutting and rolling unit 31. To move left and right.

By the above, the cutting and rolling unit 31 and the welding unit 32 are arranged side by side in the transverse direction of the hoop material 20 movably in the lateral direction of the hoop material crossing portion 35 of the main body frame 33,
In addition, each of the units 31 and 32 can freely advance and retreat to the working unit 39 at a position facing the working unit 39.

Next, a method of using the connection device SW having the above configuration will be described.

(I) Operation During Passing During the passing, that is, when the hoop material 20 is smoothly supplied to the pressing process or the like, the units 31 and 32 are passed through the hoop material as shown in FIG. Remove from center C. This state is the normal position of each unit 31, 32 in the state where the hoop material is being supplied. In this case, in consideration of the efficiency of the work described later, the cutting and rolling unit 31 is
39 Make the cutting work standby state by facing backward.

(Ii) Hoop material cutting operation Next, if the detection means (not shown) detects the end of the hoop coil during the supply of the hoop material, the supply of the hoop material is stopped, and connection with a new hoop coil is performed.

First, pull out the cutting and rolling unit 31 to the working section 39,
The end portion of the preceding hoop material 20b that has been supplied so far is fixed on the working unit 39 by the fixing devices 36 and 37. Then, by driving the air cylinder 56, the shear
55 is pushed down, and the end of the preceding hoop material 20b is cut and shaped. Subsequently, the starting end of the succeeding hoop material 20a connected to the preceding hoop material 20b is fixed on the working section 39 by the fixing devices 36 and 37, and the air cylinder 56 is driven to perform cutting and shaping.

(Iii) Welding work of hoop material Next, the cutting and rolling unit 31 is pushed into the position shown in FIG. 1 and returned to the original position, and then moved to the left, and is shown by a two-dot chain line A in FIG. By moving the welding unit 32 to the position, the welding unit 32 is made to reach the rear of the working unit 39, and the welding unit 32 is further pulled out to move to the working unit 39. Then, butt welding or lap welding is performed between the end of the preceding hoop material 20b cut and shaped and the beginning of the succeeding hoop material 20a. As a result, the leading hoop material 20b and the trailing hoop material 2
Oa is connected at its end, and a bulge is formed at the welding location by a weld bead.

(Iv) Rolling operation of the hoop material Next, after pushing back the welding unit 32 to the original position and moving it to the right, the cutting rolling unit
The cutting / rolling unit 31 is pulled out forward in this state so that the cutting unit 31 is moved to the working unit 39. Then, the upper roller 41 is moved downward by pulling the lever 66 of the toggle clamp mechanism 65 toward the front and pressing down.
By pressing the cutting and rolling unit 32 backward in this state, the raised portion formed at the welded portion of the hoop material 20 after welding is pressed by the rollers 40 and 41 to be flattened.

Thereafter, the lever 66 is pulled up to release the pressure contact between the rollers 40 and 41, and then the cutting and rolling unit 31 is returned to the original position, so that the units 31 and 32 are arranged at the normal positions during the passage.

With the above procedure, the connection of the hoop material 20 by the connection device SW is completed.

According to the above-described embodiment, in accordance with each operation (cutting, welding, and rolling) in the connection operation of the hoop material 20, the units 31 and 32 are moved to the working unit 39 while being moved right and left, and are merely retracted. After cutting and shaping the leading hoop member 20b and the trailing hoop member 20a, there is no need to move these hoop members 20a and 20b, and therefore, the work after the cutting operation of the hoop member 20 is very easy. Becomes

In each operation, units 31 and 32 are
Moving to 9, a wide space can be secured on both sides of the units 31, 32, and the operability is very good.

Furthermore, since the units 31 and 32 are retracted to a position away from the hoop material crossing portion 35 where the hoop material 20 crosses during the passing, the units 31, 32 and the hoop material 20 interfere with each other. Nothing.

And the cutting mechanism 52 and the rolling mechanism 60 are integrated,
Since the cutting and rolling unit 31 is configured, the width B of the connection device SW shown in FIG. 1 is smaller than the width B ′ of the conventional connection device SW3 shown in FIG. That is, in this embodiment, the width dimension B ₁ required to mount the welding unit 32 on the body frame 33, a width B ₂ required for mounting the cutting rolling unit 31, the welding unit
32 that the may be secured by a dimension B corresponding to the sum and width B ₃ required to retract the cutting roll unit 31 to the position shown in Figure 1 to the two-dot chain line A in advancing and retracting the working unit 39 Thus, as shown in FIG. 6, the width B becomes smaller as compared with the case where the individually configured units 21 to 23 are mounted. Further, the conventional connection device SW shown in FIG.
In 3, three sets of sliding guide mechanisms for movably supporting the units 21 to 23 had to be provided, but in this embodiment, only two sets of sliding guides 47 and 77 are required.

Therefore, according to this embodiment, not only can the operability of the connection work be improved, but also the interference between the hoop material in the passing plate and the device can be prevented, and the width of the entire device can be reduced, A hoop material connection device SW that can reduce the manufacturing cost can be realized.

The hoop material connecting device of the present invention is not limited in its details such as size and shape to the above embodiment, and various modifications are possible. For example, in the above-described embodiment, the units 31 and 32 are manually moved. However, it is needless to say that the units 31 and 32 may be moved by means such as a motor and an actuator which does not depend on human power.

[Effects of the Invention] As described above in detail, according to the present invention, the opposing ends of the two hoop materials are cut and shaped, and the ridge formed at the welding portion of the two hoop materials is formed. Cutting flattening means for pressing and flattening by a pair of rollers provided to be openable and closable, and welding means for abutting or lap welding each end of the two hoop materials cut and shaped by the cutting flattening means; A main body frame on which the cutting flattening means and the welding means are mounted on the upper surface, and a hoop material crossing portion where the hoop material traverses is provided, and a working part is formed in a part of the hoop material crossing portion, The main body frame is provided on a side of the hoop material crossing portion so as to be movable along a transverse direction of the hoop material, and includes a moving table on which the cutting flattening means and the welding means are mounted. The cutting and flattening means and the welding means are each supported on the moving table so as to be movable in a direction intersecting the transverse direction of the hoop material, and the pair of rollers move the cutting and flattening means. Because it was configured to be supported rotatably along the direction, as the lateral width of the device, the width required to mount the cutting flattening means, the width required to mount the welding means, It is only necessary to secure a dimension obtained by adding the width dimension necessary for retracting the cutting flattening means when moving the welding means to and from the working unit. Units, rolling units, and welding units can be smaller in width than when they are mounted, and can be stored in narrow spaces on existing lines, such as between press machines. Further, the sliding guide mechanism for movably supporting the unit requires only two sets, the effect of being able to reduce the production cost is obtained.

[Brief description of the drawings]

FIG. 1 is a plan view showing the configuration of a hoop connection device according to an embodiment of the present invention, FIG. 2 is a front view showing the configuration of the hoop connection device, and FIG. 3 is a configuration of the hoop connection device. 4 to 6 are plan views showing a conventional hoop material connecting device, and FIGS. 7 to 9 perform hoop material connecting work using the hoop material connecting device shown in FIG. It is a top view showing a state. SW: Hoop material connection device, Y: Hoop material cross direction, 20: Hoop material, 31: Cutting and rolling unit (cutting and rolling means), 32: Welding unit (welding means), 23: Body frame, 35… hoop material crossing section, 39… working section, 52… cutting mechanism, 60… rolling mechanism.

Claims (1)

(57) [Claims] 1. A method for cutting and shaping opposing ends of two hoop materials, and pressing a flat portion formed at a welding portion of the two hoop materials by a pair of openably and closably provided rollers. Cutting and flattening means, and welding means for butt-welding or lap welding each end of the hoop members cut and shaped by the cutting and flattening means, and the cutting and flattening means and the welding means are mounted on the upper surface. A main body frame having a working portion formed in a part of the hoop material crossing portion, and a hoop material crossing portion of the main body frame on a side of the hoop material crossing portion. The cutting flattening means and the welding means are provided so as to be movable along the transverse direction, and are provided with a moving table on which the cutting flattening means and the welding means are mounted. Respectively,
The pair of rollers are supported rotatably on the moving table in a direction intersecting the transverse direction of the hoop material, and the pair of rollers are rotatably supported along the moving direction of the cutting and flattening means. Hoop connection device.