JP7793404B2 - male blade device - Google Patents

Description

The present invention relates to a male blade device, and more specifically to a rotating male blade device that is positioned opposite a female blade device during the manufacture of deck plates.

Deck plates used as reinforced concrete flooring materials and the like are known. Deck plates are formed by bending a single metal plate to form alternating flat plate sections and reinforcing ribs perpendicular to the flat plate sections (see, for example, Patent Document 1). Each of the reinforcing ribs on such deck plates includes a vertical web section (plate joint) formed by doubling linear plate sections parallel to the longitudinal direction of the flat plate section, and a flange section located at the end of this vertical web section and extending along the longitudinal direction, with the flange section having a triangular cross section perpendicular to the longitudinal direction.

When concrete is poured onto the deck plate, the joints of the reinforcing ribs can expand and deform due to the weight of the concrete, and it is necessary to prevent this expansion. Therefore, during the deck plate manufacturing process, a rotating male blade device and a fixed female blade device, positioned opposite each other across the reinforcing rib, work together to cut out and crimp the joints of the reinforcing ribs, connecting the double metal plates together.

Japanese Utility Model Application Publication No. 60-89325

The blade of the male blade device can be damaged when cutting out the joint of the reinforcing rib, and in such cases, it must be replaced with a different blade. The part of the blade of the male blade device that breaks is often the cutting edge that comes into contact with the joint and cuts out the joint. However, with conventional male blade devices, even if only a part of the male blade device, such as the cutting edge, is damaged, the entire blade must be replaced. Therefore, there is a demand for reducing the repair costs of male blade devices.

Therefore, one of the objectives of the present invention is to provide a male blade device that can reduce repair costs.

To achieve the above-mentioned objective, the present invention provides a rotary male blade device that crimps and connects folded metal plates by sandwiching the metal plates between itself and a female blade device during the manufacture of deck plates. The device comprises a roller that rotates about an axis, and at least one blade portion that is attached to the roller and crimps the metal plates. The blade portion includes a fixed portion that is fixed to the roller, and a cutting edge portion that is detachably attached to the fixed portion and protrudes radially outward from the outer peripheral surface of the roller. When the male blade device is viewed along the axis, the tip of the cutting edge portion is offset toward the rotational direction of the roller from the center of the cutting edge portion in the width direction.

The cutting edge portion may have a single insertion hole formed therein for inserting a fastener that secures the cutting edge portion to the fixed portion, and when the male blade device is viewed along the axis, the center of the insertion hole may be located on a line that passes through the center in the width direction of the cutting edge portion and is perpendicular to the width direction. Alternatively, the cutting edge portion may have multiple insertion holes formed therein for inserting fasteners that secure the cutting edge portion to the fixed portion, and when the male blade device is viewed along the axis, the multiple insertion holes may be located in a line-symmetrical positional relationship with respect to a line that passes through the center in the width direction of the cutting edge portion and is perpendicular to the width direction.

Furthermore, the male blade device may be provided with a plurality of the blade portions, which may be arranged at equal intervals in the circumferential direction of the roller.

The present invention provides a male blade device that reduces repair costs.

FIG. 10 is a plan perspective view schematically illustrating how a male blade device according to an embodiment of the present invention is used to cut out a joining portion of a reinforcing rib and connect two metal plates together. FIG. 2 is a plan perspective view showing the male blade device shown in FIG. 1; FIG. 3 is a bottom view of the male blade device shown in FIG. 2 . FIG. 2 is a plan view showing a blade portion provided in the male blade device shown in FIG. 1 . 5 is a cross-sectional view taken along line VV shown in FIG. 4. FIG. 5 is a plan view showing a modification of the cutting edge portion shown in FIG. 4 .

Below, embodiments of the male blade device according to the present invention are illustrated with reference to the accompanying drawings. The embodiments illustrated below are intended to facilitate understanding of the present invention and are not intended to limit the scope of the present invention. The present invention can be modified or improved from the following embodiments without departing from the spirit of the invention. In addition, in the accompanying drawings, the dimensions of each component may be exaggerated or reduced in size to facilitate understanding.

Before explaining the male blade device, we will explain the deck plate that is processed (cutting, crimping, etc.) by the male blade device. Figure 1 is a plan perspective view that shows, in outline, how the male blade device 1 of this embodiment is used to cut out the plate joint portion 82 of the reinforcing rib 81 in the deck plate 8 and connect the double metal plates together.

As shown in Figure 1, the deck plate 8 is a member formed by bending a single metal plate MP, and has a structure in which flat plate portions 80 and reinforcing ribs 81 perpendicular to the flat plate portions 80 are arranged alternately. Each reinforcing rib 81 includes a plate joint 82 and a flange portion 83. The plate joint 82 is a double-layered linear plate portion that is perpendicular to the flat plate portion 80 and extends along the longitudinal direction of the flat plate portion 80. The flange portion 83 is located at the end of the plate joint 82 and extends along the longitudinal direction of the flat plate portion 80. The cross section of the flange portion 83 perpendicular to the longitudinal direction is roughly triangular.

Next, we will explain the male blade device 1. As shown in Figure 1, the male blade device 1 is a rotary device that cuts out and crimps together double metal plates MP by sandwiching the above-mentioned plate mating portion 82 between it and the fixed female blade device 3. The female blade device 3 will be mentioned again later.

Figure 2 is a plan perspective view of the male blade device 1, and Figure 3 is a bottom view of the male blade device 1. As shown in Figures 2 and 3, the male blade device 1 comprises a roller 10 and at least one blade portion 20 (four in this embodiment) attached to the roller 10. The number of blade portions 20 is not particularly limited. Also, for convenience, only one blade portion 20 is shown in Figure 2.

As shown in FIG. 2, roller 10 includes a hollow, small-diameter cylindrical portion 11, a hollow, truncated conical portion 12, and a hollow, large-diameter cylindrical portion 13 having a larger diameter than small-diameter cylindrical portion 11. Small-diameter cylindrical portion 11, truncated conical portion 12, and large-diameter cylindrical portion 13 share a common axis Lx, and are arranged in the order of small-diameter cylindrical portion 11, truncated conical portion 12, and large-diameter cylindrical portion 13 from top to bottom in the direction of axis Lx. Note that the terms "upper" and "lower" used here refer to the positional relationship in the direction of axis Lx and do not necessarily refer to upper and lower in the vertical direction.

A rotating shaft (not shown) of a power source such as a motor is attached to the internal space 10S formed in the center of the small-diameter cylindrical portion 11. The central axis of this rotating shaft coincides with the axis Lx, and the rotating shaft extends through the internal space of the truncated cone portion 12 to the internal space of the large-diameter cylindrical portion 13. As this rotating shaft rotates around the axis Lx, the roller 10 rotates clockwise or counterclockwise around the axis Lx. Note that Figures 1 to 3 show an example in which the rotation direction R1 of the roller 10 is counterclockwise when viewed from above.

As shown in FIG. 2, the truncated cone portion 12 is formed so that its diameter gradually expands radially outward in the direction of the axis Lx from the lower end of the small-diameter cylindrical portion 11 to the upper end of the large-diameter cylindrical portion 13. The truncated cone portion 12 is also formed so that its cross section along the axis Lx is trapezoidal. The small-diameter cylindrical portion 11 and the large-diameter cylindrical portion 13 are connected by the truncated cone portion 12.

The large diameter cylindrical portion 13 is the portion to which the cutting edge 20 is attached and faces the flat portion 80 of the deck plate 8. In other words, the bottom surface 13B of the large diameter cylindrical portion 13 shown in Figure 3 forms the bottom surface of the roller 10, and as shown in Figure 1, when processing the deck plate 8, the male blade device 1 is placed on the deck plate 8 so that this bottom surface 13B contacts the flat portion 80.

As shown in Figures 2 and 3, at least one notch 13n (four in this embodiment) is formed in the bottom surface 13B of the large-diameter cylindrical portion 13. In this embodiment, the four notches 13n are each formed to have approximately the same size and shape and are formed at equal intervals (i.e., at 90-degree intervals) around the circumference of the roller 10. In this embodiment, each notch 13n is formed over approximately half the total height of the large-diameter cylindrical portion 13 so as to form a roughly rectangular parallelepiped shape. Above each notch 13n, at least one hole 10h (two in this embodiment) is formed, communicating with each notch 13n. The inner circumferential surface of the large-diameter cylindrical portion 13, which forms the hole 10h, is formed with a groove (not shown) for threading in a fastener B1, such as a screw or bolt, as described below. A blade portion 20 is attached to each of these notches 13n. That is, in this embodiment, the four blade portions 20 are arranged at equal intervals (i.e., at 90-degree intervals) around the circumference of the roller 10.

Next, the blade portion 20 will be described. Figure 4 is a plan view of blade portion 20A, which is located on the right side of Figure 3 out of the four blade portions 20. More specifically, it is a perspective view of blade portion 20A when the male blade device 1 is viewed from above along the axis Lx. Figure 5 is a cross-sectional view taken along line V-V shown in Figure 4. Note that since each of the four blade portions 20 has the same configuration, only blade portion 20A will be described below.

As shown in Figures 3 to 5, the blade portion 20A includes a fixed portion 21 and a cutting edge portion 22.

The fixed portion 21 is a plate-shaped member that is approximately rectangular when viewed along the axis Lx, and has an outer shape that is symmetrical with respect to a line Lc that passes through the center of the width direction W of the blade portion 20A and is perpendicular to the width direction W. The line Lc coincides with the V-V line described above. The fixed portion 21 includes a side surface 21C on the inner circumferential side of the roller 10 and a side surface 21D on the outer circumferential side. The inner circumferential side surface 21C is linear and parallel to the width direction W when viewed along the axis Lx, and the corners on both ends of the side surface 21C are cut off. The outer circumferential side surface 21D is curved and convex radially outward when viewed along the axis Lx, and as shown in FIG. 3, the curvature of the side surface 21D is smaller than the curvature of the outer circumferential surface 13f of the large-diameter cylindrical portion 13.

The first portion 21A of the fixed portion 21, including the inner peripheral side surface 21C, occupies the majority of the fixed portion 21 and overlaps the large-diameter cylindrical portion 13 when viewed along the axis Lx. Two through holes 21h1 are formed in the first portion 21A, located more inward than the center along the line Lc. These through holes 21h1 penetrate the fixed portion 21 and communicate with the holes 10h in the large-diameter cylindrical portion 13. The two through holes 21h1 are positioned symmetrically with respect to the line Lc. As shown in Figures 4 and 5, the lower region of each through hole 21h1 forms an expanded diameter region 21h1a, which is larger in diameter than the other regions of the through hole 21h1. In Figure 4, the outer edge of the expanded diameter region 21h1a is indicated by a dashed line. As shown in Figures 2 and 3, when the fixing portion 21 is fitted into the notch 13n of the large-diameter cylindrical portion 13 with the expanded diameter region 21h1a facing downward, the two through holes 21h1 of the fixing portion 21 communicate with the two holes 10h of the large-diameter cylindrical portion 13. While maintaining this state, the fastener B1 is inserted into the through hole 21h1 from the expanded diameter region 21h1a side, and the tip of the fastener B1 is threaded into the groove formed on the inner surface of the hole 10h, thereby fixing the fixing portion 21 to the large-diameter cylindrical portion 13. At this time, the head of the fastener B1 is housed in the expanded diameter region 21h1a.

When the fixed portion 21 is fixed to the large-diameter cylindrical portion 13 as described above, the second portion 21B of the fixed portion 21, including the outer peripheral side surface 21D, protrudes radially outward from the outer peripheral surface 13f of the large-diameter cylindrical portion 13 (i.e., the outer peripheral surface 13f of the roller 10), as shown in FIG. 3. Note that in FIG. 4, the boundary between the first portion 21A and the second portion 21B is shown by a dashed line for convenience. As described above, the outer peripheral side surface 21D is curved more gently than the outer peripheral surface 13f of the large-diameter cylindrical portion 13.

As shown in Figures 4 and 5, the portion of the first portion 21A of the fixing portion 21 that is closer to the outer periphery than the center in the direction of line Lc, excluding both edges in the width direction W, forms a cutout portion 21n that extends over approximately half the total height of the fixing portion 21. As shown in Figure 4, this cutout portion 21n is generally rectangular when viewed along the axis Lx, and as shown in Figure 5, it is defined by a bottom surface 21s that is parallel to both main surfaces 21f, 21f of the fixing portion 21, and a vertical surface 21p that is perpendicular to the bottom surface 21s. At least one hole 21h2 (one in this embodiment) is formed in the bottom surface 21s of the cutout portion 21n. In this embodiment, the center of this hole 21h2 is located on line Lc. A groove is formed in the inner peripheral surface of the fixing portion 21 that forms the hole 21h2 for threading in a fastener B2, such as a screw or bolt, as described below.

As shown in Figures 4 and 5, the cutting edge portion 22 is a plate-shaped member having a width slightly greater than half the width of the fixed portion 21, and includes a generally rectangular base portion 22A and a generally triangular tip portion 22B when viewed along the axis Lx.

As shown in FIG. 4, the base 22A of the cutting edge 22 is located inward of the outer circumferential side surface 21D of the fixed portion 21 when viewed along the axis Lx, and overlaps the fixed portion 21. The base 22A is formed with an outer shape that is symmetrical with respect to the aforementioned line Lc. That is, line Lc passes through the center of the base 22A in the width direction W. At least one insertion hole 22h (one in this embodiment) is formed in the base 22A, penetrating the base 22A. In this embodiment, the center of the insertion hole 22h is located on line Lc. The base 22A is formed in a shape corresponding to the cutout 21n of the fixed portion 21, and in this embodiment, it is fitted into the cutout 21n. In this fitted state, the insertion hole 22h of the base 22A and the hole 21h2 of the fixed portion 21 are in communication. As shown in Figure 5, fastener B2 is inserted into the communicating insertion hole 22h and hole 21h2 from the insertion hole 22h side, and the tip of fastener B2 is threaded into the groove on the inner surface of the fixed portion 21. In this way, the cutting edge portion 22 is detachably attached to the fixed portion 21.

As shown in Figure 4, the tip 22B of the cutting edge 22 is located more radially outward than the outer circumferential side surface 21D of the fixed portion 21 when viewed along the axis Lx, and protrudes radially outward from the fixed portion 21. The tip 22B has an asymmetrical outer shape with respect to the line Lc, and the tip 22T of the tip 22B is offset in the direction of rotation R1 of the roller 10 from the line Lc, which is the center of the cutting edge 22 in the width direction W, when viewed along the axis Lx. As shown in Figures 2 and 3, part of the base 22A and the tip 22B of the cutting edge 22 protrude radially outward from the outer circumferential surface 13f of the large-diameter cylindrical portion 13.

As described above, the male blade device 1 of this embodiment comprises a roller 10 that rotates around the axis Lx and four blade portions 20 provided on the outer peripheral surface 13f of the roller 10. Each blade portion 20 includes a fixed portion 21 that is fixed to the roller 10 and a cutting edge portion 22 that is detachably attached to the fixed portion 21 and protrudes radially outward from the outer peripheral surface 13f of the roller 10. When the male blade device 1 is viewed along the axis Lx, the tip 22T of the cutting edge portion 22 is offset toward the rotation direction R1 of the roller 10 from the center of the cutting edge portion 22 in the width direction W.

Next, we will explain an example of the operation of this male blade device 1 and an example of the effect that the male blade device 1 provides.

As shown in FIG. 1, in the manufacturing equipment for deck plates 8, the male blade device 1 is arranged opposite a fixed female blade device 3. The portion of the female blade device 3 facing the cutting edge 22 of the male blade device 1 has a notch 31 cut out to allow the tip 22B of the cutting edge 22, which rotates in the rotation direction R1, to pass through the female blade device 3. A plate joint 82 of the deck plate 8 is interposed between the male blade device 1 and the female blade device 3. In the manufacturing equipment for deck plates 8, the deck plate 8 is transported in the conveying direction T. In this conveying direction T, a pair of crushing rollers 40 are arranged downstream of the opposing male blade device 1 and female blade device 3, sandwiching the plate joint 82 between them. The pair of crushing rollers 40 rotate in the rotation direction R2.

When this manufacturing equipment operates, the deck plate 8 is transported in the conveying direction T, the male blade device 1 rotates in the rotational direction R1, and the pair of crushing rollers 40 rotate in the rotational direction R2. As the male blade device 1 rotates in the rotational direction R1, the portion of the plate joint 82 of the deck plate 8 transported in the conveying direction T that abuts the cutting edge 22 is sequentially cut into a strip by the cutting edge 22 within the cutout portion 31 of the female blade device 3. In this way, in the manufacturing equipment shown in FIG. 1, the double metal plate MP at the plate joint 82 is cut into a strip and crimped together through cooperation between the male blade device 1 and the female blade device 3. Here, when the male blade device 1 is viewed along the axis Lx, the tip 22T of the cutting edge 22 is offset toward the rotational direction R1 of the roller 10 from the center of the cutting edge 22 in the width direction W. With this configuration, when viewed along the axis Lx, the approach angle of the tip 22T of the cutting edge 22 to the mating portion 82 at the time it contacts the mating portion 82 is larger than when the tip of the cutting edge 22 is located in the center of the width direction of the cutting edge or when it is shifted to the opposite side of the roller rotation direction. This allows the cutting edge 22 to effectively bite into the mating portion 82. Therefore, the portion of the mating portion 82 that the cutting edge 22 abuts against can be properly cut out and crimped into the cutout portion 31 of the female blade device 3.

The cut double strip-shaped metal plate MP is successively crushed by a pair of crushing rollers 40 located downstream and rotating in the rotation direction R2. In this way, the plate joints 82 are connected to prevent them from spreading apart, forming the reinforcing ribs 81 of the deck plate 8.

However, when cutting out metal plate MP in the manner described above, the cutting edge of the blade portion of the rotating male blade device may wear or be damaged due to contact with the metal plate MP or other factors. In such cases, because the cutting edge portion 22 of the blade portion 20 of the male blade device 1 is detachably attached to the fixed portion 21, it is not necessary to replace the entire blade portion 20; only the cutting edge portion 22 needs to be replaced. Therefore, the male blade device 1 can reduce repair costs.

In addition, while Figure 1 shows an example in which the rotation direction R1 of the roller 10 of the male blade device 1 is counterclockwise, there are cases in which it is preferable for the rotation direction R1 of the roller 10 to be clockwise due to various circumstances. In this case, for the reasons described above, when the male blade device 1 is viewed along the axis Lx, it is preferable that the tip 22T of the cutting edge 22 is shifted toward the new rotation direction R1 of the roller 10 from the center in the width direction W of the cutting edge 22. In the blade portion 20 of the male blade device 1, the cutting edge 22 is detachably attached to the fixed portion 21. Therefore, with the male blade device 1, by temporarily removing the cutting edge 22 from the fixed portion 21 and inverting it, and then reattaching the inverted cutting edge 22 to the fixed portion 21, it is possible to shift the tip 22T of the cutting edge 22 toward the new rotation direction R1 of the roller (clockwise) from the center in the width direction W of the cutting edge 22 when viewed along the axis Lx. In this way, with the male blade device 1, one type of blade portion 20 can be used to accommodate both rotation directions of the roller 10, eliminating the need to prepare two types of blade portions to accommodate both rotation directions, thereby reducing parts costs.

In addition, in the blade portion 20 of the male blade device 1, the center of the insertion hole 22h for inserting the fastener B2 that secures the cutting edge portion 22 to the fixing portion 21 is located on a straight line Lc that passes through the center of the cutting edge portion 22 in the width direction W and is perpendicular to the width direction W when the male blade device 1 is viewed along the axis Lx. Therefore, even when the cutting edge portion 22 is turned over, the position of the insertion hole 22h does not change from before the cutting edge portion 22 is turned over. Therefore, there is no need to prepare two types of fixing portions 21 with different positions of the hole 21h2 to accommodate the rotation directions on both sides of the roller 10, thereby reducing parts costs.

The male blade device 1 also has multiple (four) blade portions 20, which are arranged at equal intervals around the circumference of the roller 10. This configuration allows the metal sheet MP to be cut out more effectively than when there is only one blade portion 20, and the load on each cutting edge portion 22 is distributed, improving the lifespan of the cutting edge portions 22. Furthermore, because the multiple cutting edges 20 are arranged at equal intervals around the circumference of the roller 10, the center of gravity of the male blade device 1 is less likely to shift from the axis Lx.

The present invention has been described above using the above embodiment as an example, but the present invention is not limited to this.

For example, in the above embodiment, an example was described in which one insertion hole 22h is formed in the cutting edge portion 22. However, the number of insertion holes 22h may be multiple (two, three or more). For example, as a modified example, a cutting edge portion 22' as shown in FIG. 6 may be configured. The cutting edge portion 22' of this modified example has the same configuration as the cutting edge portion 22 except for the fact that it has two insertion holes 22h. When the male blade device 1 is viewed along the axis Lx, the two insertion holes 22h are positioned symmetrically with respect to a line Lc that passes through the center of the cutting edge portion 22' in the width direction W and is perpendicular to the width direction W. With this configuration, even when the cutting edge portion 22' is turned over, the positional relationship of the multiple insertion holes 22h does not change from before the cutting edge portion 22' was turned over. Therefore, there is no need to prepare two types of fixing parts to accommodate the rotation directions on both sides of the roller 10, reducing parts costs.

Furthermore, when the cutting edge portion 22 has one insertion hole 22h, the center of the insertion hole 22h may be offset from the line Lc that passes through the center of the cutting edge portion 22 in the width direction W and is perpendicular to the width direction W. However, in this case, when the cutting edge portion 22 is turned over, the position of the insertion hole 22h will change from before the cutting edge portion 22 is turned over, so it is necessary to prepare a fixing part with a hole formed in it that corresponds to the new position of the insertion hole 22h. Therefore, considering that a single type of fixing part can be used to accommodate the rotation directions of both sides of the roller 10, it is preferable that the center of the insertion hole 22h be located on the line Lc that passes through the center of the cutting edge portion 22 in the width direction W and is perpendicular to the width direction W.

Furthermore, when the cutting edge portion 22 has multiple insertion holes 22h, the multiple insertion holes 22h do not have to be positioned symmetrically with respect to the line Lc that passes through the center of the cutting edge portion 22 in the width direction W and is perpendicular to the width direction W. However, in this case, when the cutting edge portion 22 is turned over, the positional relationship of the multiple insertion holes 22h will change from before the cutting edge portion 22 is turned over. Therefore, in consideration of the fact that a single type of fixing part can be used to accommodate the rotation directions of both sides of the roller 10, it is preferable that the multiple insertion holes 22h be positioned symmetrically with respect to the line Lc that passes through the center of the cutting edge portion 22 in the width direction W and is perpendicular to the width direction W.

Furthermore, if the male blade device has multiple blade portions 20, the multiple blade portions 20 do not have to be arranged at equal intervals in the circumferential direction of the roller 10. Also, there may be only one blade portion 20.

1...male blade device, 8...deck plate, 3...female blade device, 10...roller, 13f...outer surface, 20, 20A...blade portion, 21...fixed portion, 22, 22'...blade tip portion, 22h...through hole, 22T...tip, Lx...axis, Lc...straight line, MP...metal plate, R1...rotation direction

Claims (5)

A rotary male blade device that, in the manufacture of a deck plate, clamps folded metal plates together between itself and a female blade device to crimp and connect the metal plates together,
A roller that rotates around an axis;
at least one blade attached to the roller for crimping the metal plate;
Equipped with
The blade portion is
a fixed portion fixed to the roller;
a cutting edge portion detachably attached to the fixed portion and protruding radially outward from the outer circumferential surface of the roller,
When the male blade device is viewed along the axis, the tip of the cutting edge portion is shifted toward the rotation direction of the roller from the center in the width direction of the cutting edge portion,
a first hole communicating with a hole formed in the roller is formed in an inner peripheral portion of the fixed portion, and a second hole communicating with an insertion hole formed in the cutting edge portion is formed in an outer peripheral portion of the fixed portion,
A male blade device characterized in that the roller and the fixed portion are screwed together through the first hole, and the fixed portion and the cutting edge portion are screwed together through the second hole. an outer peripheral side surface of the fixed portion protrudes radially outward from an outer peripheral surface of the roller,
2. The male blade device according to claim 1 , wherein the entire triangular tip of the cutting edge protrudes outward from the outer peripheral side surface of the fixed part. The cutting edge portion has an insertion hole formed therein for inserting a fastener that fixes the cutting edge portion to the fixing portion,
3. The male blade device according to claim 1, wherein when the male blade device is viewed along the axis, the center of the insertion hole is located on a straight line that passes through the center of the cutting edge portion in the width direction and is perpendicular to the width direction. The cutting edge portion has a plurality of insertion holes formed therein for inserting fasteners that fix the cutting edge portion to the fixing portion,
The male blade device according to claim 1 or 2, characterized in that, when the male blade device is viewed along the axis, the multiple insertion holes are positioned symmetrically with respect to a line that passes through the center in the width direction of the cutting edge portion and is perpendicular to the width direction. The male blade device includes a plurality of the blade portions,
5. The male blade device according to claim 1, wherein the plurality of blade portions are arranged at equal intervals in the circumferential direction of the roller.