JP3337849B2 - Coin rectification mechanism in coin transporter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coin transport apparatus provided inside a game machine row in which a plurality of game machines and a game medium lending machine placed between the respective game machines are connected. The present invention relates to a coin rectifying mechanism in a coin transport device that rectifies and forwards overlapping coins one by one when coins discharged from an amusement medium lending machine onto an endless belt of a coin transport device are transported to one end by the endless belt.

[0002]

2. Description of the Related Art As is well known, this type of coin transporter connects a plurality of amusement machines (pachinko machines) and a game media lending machine (ball pitcher) between the respective pachinko machines. The coins are provided inside a row of amusement machines, and the coins ejected from the above-mentioned bet lending machine onto the endless belt of the coin transport device can be transferred to one end by the endless belt. In such a coin transport device, since it is necessary to count the collected coins, it is necessary to align the coins on the endless belt before counting. For this reason, the coin transport device is provided with a coin rectification mechanism (actual opening flat 4-7).
525, and JP-B-63-24519).

[0003] The basic structure of this coin transport device is as follows. An endless belt is stretched around a rotation shaft provided at one end of the game machine row and a rotation shaft provided at the other end of the game machine row. The endless belt can be driven to be movable in the coin transport direction. Further, the basic structure of the coin rectifying mechanism is such that a rectifying rotating roller formed in a cylindrical shape is disposed on the coin conveying surface of the endless belt, and is as follows. In the rectifying rotation roller, the rotation shaft is disposed in the width direction of the endless belt, and the endless belt facing surface of the cylindrical surface has a gap of a height of coins from a coin conveyance surface of the endless belt. The rotation shaft is disposed at the position.

Further, the rectifying rotation roller of the coin rectifying mechanism has a shape in which a rubber material or a urethane material is lined with a cylindrical metal core (for example, Japanese Utility Model Laid-Open No. 4-7525).
As shown in FIG. 8, there is a cylindrical body 121 in which cut portions 122 are formed at equal intervals on the outer periphery of a cylindrical body 121 (see Japanese Utility Model Publication No. 63-24519). And 63-
In the coin rectifying mechanism described in Japanese Patent No. 24519, the cut portion 122 of the rectifying rotary roller 120 is formed by a short side 122a and a long side 122b as shown in FIG.
Further, as shown in FIG. 9, the rectifying rotation roller 120 is disposed with an interval 125 corresponding to the thickness of the coin 124 from the surface of the endless belt 123.
The coin 23 rotates in a direction B opposite to the coin conveying direction A.

[0005]

However, in the above-mentioned conventional coin rectifying mechanism, in which a rectifying rotating roller in which a rubber material is lined with a cylindrical core is simply arranged, the coin is superposed (superposed). Although it has a gripping force to repel the upper part of the coin, it has a drawback in that the rubber material is severely consumed and lacks durability. Further, in a device in which a rectifying rotary roller in which a urethane material is lined with a cylindrical core is simply disposed, the urethane material is not consumed, but there is a drawback that the grip force is lacking. That is, in the above conventional coin rectifying mechanism, there is a drawback that if the hardness of the lining material is made high, gripping power is lacking, and if the lining material is made low hardness, the lining material is consumed.

Further, in a coin rectifying mechanism in which a cut portion is provided in a rectifying rotating roller, as shown in FIGS. 8 and 9, for example, coins 124, 1
When the coins 24 are conveyed in an overlapping state, the coin 124 in the forward direction is carried into the interval 125,
Actually, the tip of the superimposed coin 124 cannot be kicked by the short side portion 122a of the cut portion 122.

For this reason, when the coins 124, 124 overlapped with the R surface shape of the rectifying rotary roller 120, the mechanism of the rectifying rotary roller 120 is pushed and floated as shown in FIG. 125 is wider)
In some cases, the superimposed coins 124 passed. Further, when the rectifying rotation roller 120 is fixed so as not to move up and down, a load is applied to the endless belt 123, and in the worst case, the endless belt 123 may be cut.

Further, in a coin rectifying mechanism provided with a rectifying rotation roller 120 provided with the cutout portion 122,
When assembling this, the direction of assembly of the rectifying rotary roller 120 is required.
As shown in FIG. 1, when assembled in the opposite direction, the superimposed coins 124, 124 cannot be kicked and have a disadvantage that they pass through, resulting in an increase in the number of assembly steps.

Furthermore, even when the main power supply of the above-mentioned conventional coin collecting apparatus is cut off, coins are inserted, so that it is necessary to increase the volume in the rectifying mechanism. However, when coins larger than the capacity have entered, it is mechanically impossible to rectify these coins. Therefore, if the transport is continued when coins larger than the capacity have entered, the drive motor of the endless belt is restrained, and a load is applied to the transport belt. In the worst case, the belt is broken. Therefore, when a coin larger than the capacity has entered, the drive motor is stopped, then the drive motor is rotated in reverse, and the drive motor is further rotated forward to break down the lump and reliably rectify the coin. Has been proposed (see Japanese Utility Model Publication No. 4-7525).

[0010] As described above, the coin rectifying mechanism requires a sensor that can rotate forward and reverse and detects the presence of coins having a capacity greater than the capacity thereof. there were. Therefore, the present invention has been made by focusing on such conventional problems,
An object of the present invention is to provide a coin rectifying mechanism in a coin transport device that can surely rectify a superimposed coin, reduces the number of parts, and facilitates assembly.

[0011]

In order to achieve the above object, a coin rectifying mechanism in a coin transport device according to the present invention comprises an endless belt stretched on rotating rollers provided at one end and the other end of a row of amusement machines. The endless belt is driven so that the coin conveying surface of the endless belt can move in the conveying direction, and the rotating shaft of the rectifying rotary roller formed in a cylindrical shape on the coin conveying surface of the endless belt and in the width direction of the endless belt. The rectifying rotation roller is disposed at a position where the endless belt facing surface of the cylindrical surface has a gap of a coin height from the coin transport surface of the endless belt, and rotates in the opposite direction to the endless belt. In the rectifying mechanism in the coin transport device that is driven, the rectifying rotating roller forms recesses at regular intervals at predetermined angles on the outer periphery of the cylindrical body, and the recess is formed from the outer periphery of the cylindrical body. In the center of the rotation axis At a thickness of about the depth of the selfish coin,
In addition, by providing a cut portion having a length of about half a coin in the outer peripheral direction, a short side of two sides and a long side which intersects the both short sides at right angles to the both short sides are formed. Is what you do. Further, it is desirable that the cylindrical body constituting the rectifying rotary roller is made of a material having both gripping power and durability. For example, urethane rubber having a hardness of A80 to A90 may be used as a material of the rectifying rotary roller. The recess provided on the outer periphery of the cylindrical body of the rectifying rotation roller has a depth of 0.9 [mm] to 1.8 [mm] from the outer periphery toward the center of the rotation shaft and has a depth of 16 mm in the outer periphery direction. Provide a notch of about [mm] length,
It is desirable to have a shape consisting of two short sides and a long side which intersects the short sides at right angles and connects the both ends. Further, the gap between the endless belt facing surface of the cylindrical surface of the rectifying rotation roller and the coin transport surface of the endless belt is
It may be 2.0 [mm] to 3.0 [mm].

That is, the coin rectifying mechanism in the coin transport device according to the first aspect of the present invention is a coin rectifying mechanism, comprising a plurality of amusement machines and a game machine medium lending machine disposed between the respective amusement machines. An endless belt is stretched around rotating rollers provided inside and on the one end side and the other end side of the amusement machine row, and a coin conveying surface of the endless belt is movable in a conveying direction. Is provided in a coin transport device provided with an upright wall that does not drop coins, and on the coin transport surface of the endless belt and in the width direction of the endless belt, a rotating shaft of a rectifying rotary roller formed in a cylindrical shape is provided. The endless belt facing the endless belt on the cylindrical surface is disposed at a position having a gap of a coin height from the coin conveyance surface of the endless belt, and is driven to rotate in a direction opposite to the endless belt. Coin transport equipment In the rectifying mechanism of the above, the rectifying rotary roller forms recesses at regular intervals on the outer circumference of the cylindrical body at 45 ° intervals, and the recesses are formed from the outer circumference of the cylindrical body toward the center of the rotation axis. 0.9 [mm] to 1.8
By providing a notch having a depth of [mm] and a length of about 16 [mm] in the outer peripheral direction, a short side of two sides and a long side intersecting at right angles to the both short sides and connecting the both sides are formed. In addition to the above, the outer peripheral surface of the projection formed in the concave portion and the adjacent concave portion has a partially curved surface of a cylindrical surface, and the rectifying rotation roller is made of urethane rubber having a hardness of A80 degrees to A90 degrees. Is used.

[0013]

In the coin rectifying mechanism of the coin transport device according to the present invention, as a result of a detailed study of the state of stacking of coins, the most suitable shape of the rectifying rotary roller for rectifying the coins is adopted. When coins are piled up, a lower coin is made to penetrate while flipping the upper surface of the earlier coin at the projection formed by the predetermined recess and the recess next to it, and when coins are piled up in the later state The lower coin can be made to enter while flipping at the projection or the cut corner, and when entering a large amount of coins, straightening can be performed while breaking the mass at the recess and the projection.

Further, in the coin rectifying mechanism according to the present invention, since the rectifying rotating roller has a symmetrical shape, there is no orientation at the time of assembling, no erroneous assembling is performed, and the gap adjustment can be easily confirmed at the convex portion. Further, in the coin rectifying mechanism according to the present invention, since a material having both grip force and durability is selected as a material of the cylindrical body constituting the rectifying rotating roller, it is possible to rectify the superimposed coin without fail,
And accurate rectification can be maintained for a long time.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view partially broken away showing an example in which the embodiment of the coin rectifying mechanism of the present invention is applied to a coin transport device.
FIG. 2 is an enlarged cross-sectional view of one of the upright walls of the apparatus, viewed from the side. FIG. 3 is an enlarged front view showing a rectifying rotary roller used in the apparatus. FIG. 4 is an enlarged sectional view showing the rectifying rotation roller.

In these figures, the coin transport device 10
Is provided inside a row of amusement machines in which a plurality of pachinko machines (not shown) are connected to a pachinko ball lending machine (not shown) placed between the respective pachinko machines. The coins discharged from the lending machine on the endless belt 11 of the transport device can be transferred to the one end 12 by the endless belt 11. Although not shown, a coin counting device, a safe, and the like are arranged on the one end side 12.

The coin transport device 10 has the following structure. A rotating roller 13 is disposed at one end 12 of the game machine row, and the other end 1 of the game machine row is provided.
4 is provided with an auxiliary rotating roller 15. An endless belt 11 is stretched between the rotating rollers 13 and 15, and a tension roller 16 is provided below the endless belt 11 so that the endless belt 11
The endless belt 11 is stretched between the rotating rollers 13 and 15 by pressing the lower surface of the endless roller with the rollers 16.

The rotating shaft 13 is rotatably driven by a driving motor (not shown), and the rotating roller 13 is driven to rotate so that the upper side of the endless belt 11 (coin transport surface). Can be moved in the direction of arrow A. Standing walls 1 on both sides of the endless belt 11
7 and 17 are provided to prevent coins from dropping from both ends of the endless belt 11 while the coins are being conveyed. In the figure, the upright wall 1 is used for easy understanding of the device configuration.
7 is partially cut away.

Next, the coin rectifying mechanism 20 provided in the coin transport device 10 will be described. This coin rectification mechanism 20
Basically includes a rectifying rotary roller 21 having the structure of the present invention, a driving device (not shown) for driving the rectifying rotary roller 21 to rotate, and other accessories (partially not shown). And is disposed near the end of one end 12 of the endless belt 11.

Next, the structure of the rectifying rotation roller 21 will be described with reference to FIGS. The rectifying rotation roller 21 is basically formed by lining urethane rubber 23 with a predetermined thickness on the outer periphery of a cylindrical cored metal part 22 and forming the urethane rubber 23 into a predetermined shape.
It is set to 4. This mandrel 22 is made of metal
It is formed in a cylindrical shape having a width W of, for example, 34 mm and a diameter d of, for example, 52 mm. A urethane rubber 23 having a hardness of A70 to A90 degrees is provided on the outer peripheral portion of the mandrel portion 22. The thickness h is, for example, about 8 mm, and the width w is, for example, 10 at the outer peripheral central portion of the mandrel portion 22. It is lined and provided so as to form a groove 28 of [mm]. Thus, the rectifying rotation roller 21 has a diameter D
Becomes 60 [mm], for example.

By providing eight recesses 25 on the outer periphery of the urethane rubber 23 at every angle θ (= 45 degrees), the projections 26 formed by the recesses 25 are formed.
Are provided at eight positions every 45 degrees. This recess 25 has a depth F of, for example, 2.0 [mm] at the center of the recess 25 from the outer periphery of the urethane rubber 23 toward the center of the rotation axis of the core metal portion 22 (in other words, 500 yen). (For the thickness of the coin)
And a cut having a length L of, for example, 16 [mm]. Thus, the recess 25 includes two short sides 25a and 25b and a long side 25c which intersects the short sides 25a and 25b at right angles and connects the two short sides 25a and 25b.

The protruding portion 26 has a predetermined recess 25 (short side 25a) and a recess 25 adjacent thereto (short side 25a).
b), and its outer peripheral surface has a partially curved cylindrical surface. The rectifying rotation roller 21 having such a shape is provided on the coin transport surface of the endless belt 11, and is arranged such that the rotation shaft 27 of the roller 21 faces the width direction of the endless belt 11. . The rectifying rotation roller 21 is provided with a cylindrical body 24 (projection 2).
The surface facing the endless belt (surface 6) has a gap G (for example, about 2.0 to 3.0 [mm]) having a height of 500 yen coin from the coin transport surface of the endless belt 11. It is arranged in such a position.

Further, the rectifying rotary roller 21 can be driven to rotate in the direction B opposite to the coin transport direction A of the endless belt 11 by the rotary drive device. It is desirable that the rectifying rotation roller 21 be rotated at the next rotation speed. That is, one end 12 of the game line
When the coin transport surface of the endless belt 11 is moved at a speed of, for example, 100 [mm / s] ± 20% in order to more surely perform the counting in the endless belt 11, the rotation speed of the rectifying rotation roller 21 is not changed. Is desirably set to +300 [%]. The rectifying rotation roller 21 is covered with a cover 29.

The operation of the embodiment having such a configuration is shown in FIG.
4 to FIG. 4 will be described with reference to FIGS. Here, FIG. 5 is a diagram for explaining the operation of rectifying coins at the time of incoming coin stacking, and FIG. 5 (1) shows the state of entering a stacked coin at the time of incoming coin stacking, and FIG. FIG. 5 (3) is a diagram illustrating a state in which the incoming coin is moved, and FIG. 5 (3) is a diagram illustrating a state in which the incoming coin is moved to the incoming coin stack. FIG. 6 is a diagram for explaining the operation of rectifying coins at the time of later coin stacking. FIG. 6 (1) shows the state of coin entry during the later coin stacking, and FIG. FIG. 6 shows the state of the movement.
FIG. 3C is a diagram illustrating a state in which later coins are arranged. FIG. 7 is a diagram for explaining a state in which a large number of coins are superimposed on each other, and FIG.
It is a figure which shows the state which (2) cut down, respectively.

<Rectification Operation in Preliminary Coin Stacked State> The rectification operation in the advanced coin stacked state will be described with reference to FIG. FIG.
(1) shows an advanced coin stacking state in which the coin 34b is stacked on the front side of the coin 34a. Each of the above coins 34
The coins a and 34b are conveyed on the coin conveying surface of the endless belt 11 in a state where the coins are superimposed, and enter below the rectifying rotation roller 21 of the coin rectifying mechanism 20 as shown in FIG. Then, the lower coin 34a can be made to enter as shown in FIG. 5 (3) while playing the upper surface of the incoming coin 34b as shown in FIG. 5 (2) by the protrusion 26 of the rectifying rotation roller 21. . As a result, the coin 34b moves and enters the rear side of the coin 34a as shown in FIG.

<Rectifying Operation in Late Coin Stacking State> In the late coin stacking state, the coins 34a and 34b enter below the rectifying rotary roller 21 of the coin rectifying mechanism 20 as shown in FIG. . Then, as shown in FIG. 6 (2), the short side 25b (or the projection 26) of the recess 25 of the rectifying rotary roller 21 flips the end face of the coin 34b as shown in FIG. The lower coin 34a can be made to enter the lower coin 34a. As a result, the coin 34b moves, and FIG.
As shown in (3), the coin 34a is rectified behind.
As a result, the coin 34b also passes through the lower surface of the rectifying rotation roller 21, respectively. Therefore, the coins 34a and 34b are counted by the counting device (not shown) and stored in a safe (not shown).

<Operation at the time of stacking a large number of coins> As shown in FIG. 7A, when a large number of coins 34, 34,. 7 (2), the large number of coins 34, 34,... Are broken down by the projections 26, and the lowermost coins 34 among the large amount of coins 34, 34,. Pass underneath. In this embodiment, the coins 34, 34, ... are rectified as described above.

<Advantages of the Embodiment> In this embodiment, no trouble is caused by employing the urethane rubber 23 lining the mandrel portion 22 of the rectifying rotation roller 21 having a gripping force. The coin can be rectified in the best condition at all times, and the reliability of the device can be improved.

Further, in the above embodiment, since the urethane rubber 23 is made of a durable material, troubles due to wear of the rectifying rotary roller 21 can be prevented, and replacement and mounting of the roller 21 can be prevented. The time and cost required for maintenance such as position adjustment can be reduced.

Further, in the above embodiment, the pattern of the superimposed coin is thoroughly studied, and the outer shape of the rectifying rotary roller 21 is made uneven as described above. The lower coin 34a is made to enter while flipping the upper surface of the lower coin 34a, and the lower coin 34a is made to enter again while flipping the backward coin 34b at the corner (short side 34b) of the projection 26 or the recess 25 when the backward coin is stacked. When a large amount of coins enter, the flow can be rectified while breaking the mass at the recesses 25 and the protrusions 26, so that the coins can be rectified in the best condition at all times, and the reliability of the device can be improved. it can.

Furthermore, in the above embodiment, since the shape of the recess 25 and the projection 26 is symmetrical, the work of the rectifying rotary roller 21 can be performed without confirming the direction of the rectifying rotary roller 21 during assembly. The work efficiency can be improved, and the coin can be kept in the best condition without any influence on the coins due to the installation in the opposite direction. The counting device (not shown) installed at one end 12 The best counting environment can be provided.

In addition, in the above embodiment, the rectifying rotation roller 21 is moved 2.0 mm from the surface of the endless belt 11 in the conveyance direction.
By installing with a gap G of [mm] to 3.0 [mm], two coins of coins 34a and 34b superimposed at the same time cannot pass, and only one coin 34 is passed. Thus, the rectifying effect is more reliable. Therefore, according to the present embodiment, coins are reliably rectified even when coins are stacked, and the counting device provided at one end 12 in the game machine row does not malfunction and fetches data accurately. be able to. In the above embodiment, the rectifying rotation roller 21 having the above-described value for the endless belt 11 having a predetermined width is used.
Is used, an optimal value can be selected according to the dimensions such as the width of the endless belt 11.

[0033]

As described above, according to the coin rectifying mechanism in the coin transport device of the present invention, the rectifying rotary rollers are formed at regular intervals on the outer periphery of the cylindrical body at predetermined intervals at regular intervals. By providing a notch having a depth about the thickness of a coin from the outer periphery of the cylindrical body toward the center of the rotation axis, and having a length of about a half of a coin in the outer periphery direction, Since the short side and the short side intersect at right angles to form a long side connecting both short sides, the lower coin is entered while flipping the upper surface of the forward coin at the protrusion during the forward coin stacking, and at the time of the backward coin stacking. The bottom coin can be entered while flipping backward coins at the protrusions or recesses, and when a large amount of coins enter at once, it can be rectified while collapsing at the recesses and protrusions, and always in the best condition Rectifying coins with Can be, it is possible to improve the reliability of the device.

Further, since the cylindrical body constituting the rectifying rotary roller is made of a material having both grip force and durability, troubles can be completely eliminated, and coins are always kept in the best condition. It is possible to rectify and improve the reliability of the device, not only to prevent troubles due to the wear of the rectifying rotating roller, but also to reduce the time required for maintenance such as replacing the roller and adjusting the mounting position. Costs can be reduced.

Further, since the rectifying rotary roller has a symmetrical shape of the concave portion and the protruding portion, the work can be performed without confirming the direction of the rectifying rotary roller at the time of assembling, and the working efficiency can be improved. It is possible to always keep the apparatus in the best condition without affecting the coins due to the mounting in the opposite direction, and to provide the best counting environment to the counter (not shown) installed at one end. Furthermore, in the present invention, by installing the rectifying rotation roller with a predetermined gap from the surface of the endless belt in the transport direction, two coins that have been superimposed at the same time cannot pass, and only one coin And the above rectification effect is further ensured. Thus, according to the present invention,
Even if coins overlap, the coins are rectified without fail, so that the counting device provided at one end in the game machine row does not malfunction and data can be taken in accurately.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an embodiment of a coin rectifying mechanism in a coin transport device of the present invention.

FIG. 2 is an enlarged cross-sectional view of the embodiment, showing rollers and the like as viewed from a side surface excluding an upright wall.

FIG. 3 is an enlarged front view showing a rectifying rotary roller used in the embodiment.

FIG. 4 is an enlarged sectional view showing the rectifying rotation roller.

FIG. 5 is a diagram for explaining the operation of the embodiment.

FIG. 6 is a diagram for explaining the operation of the embodiment.

FIG. 7 is a diagram for explaining the operation of the embodiment.

FIG. 8 is a diagram showing an example of a conventional coin rectification mechanism.

FIG. 9 is an enlarged view showing a conventional coin rectifying mechanism.

FIG. 10 is a diagram for explaining the operation of a conventional coin rectification mechanism.

FIG. 11 is a view for explaining an operation when a rectifying rotation roller of a conventional coin rectifying mechanism is mounted in an opposite direction.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Coin transport apparatus 11 ... Endless belt 12 ... One end 13 ... Rotating roller 14 ... Other end 15 ... Rotating roller 16 ... Tension roller 20 ... Coin rectification Mechanism 21: Rectifying rotating roller 22: Core part 23: Urethane rubber 24: Cylindrical body 25: Concavity 26: Protrusion 27: Rotating shaft 28: Groove 29 ・ ・ ・ Cover 34 ・ ・ ・ Coin

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Koichiro Marubashi 7-86, Sakaino-cho, Kiryu-shi, Gunma Co., Ltd. Inside Amtex Co., Ltd. Texnai (72) Inventor Takao Nakajima 7-86, Sakaino-cho, Kiryu-shi, Gunma Inside Amtex Co., Ltd. (72) Inventor Yasushi Ishihara 7-86, Sakaino-cho, Kiryu-shi, Gunma Pref. Applicant Hiroyuki Octagon 7-86, Sakaino-cho, Kiryu-shi, Gunma Pref. Within Amtex Co., Ltd. (72) Inventor Tatsuya Fujio 7-86, Sakaino-cho, Kiryu-shi, Gunma Pref. 167091 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G07D 1/00-13/00 A63F 5/04 A63F 7/02 B65G 47/28

Claims (1)

(57) [Claims] 1. An amusement machine line provided with a plurality of amusement machines and a game machine medium lending machine interposed between the amusement machines, wherein one end and the other end of the amusement machine row are provided. An endless belt is stretched around a rotating roller disposed in the coin conveying device, and a coin conveying surface of the endless belt is movable in a conveying direction, and a coin conveying device provided with an upright wall that does not drop coins on both sides of the endless belt. A rotating shaft of a rectifying rotary roller formed in a cylindrical shape on the coin transport surface of the endless belt and in a width direction of the endless belt, wherein the rectifying rotary roller has an endless belt on its cylindrical surface. In a rectifying mechanism in the coin transport device, the facing surface is disposed at a position having a gap of a height of a coin from the coin transport surface of the endless belt, and is driven to rotate in a direction opposite to the endless belt, , Cylindrical circle On the outer periphery of the body 4
Depressions are formed at equal intervals every 5 degrees, and the depressions are 0.9 [mm] from the outer periphery of the cylindrical body toward the center of the rotation axis.
1.8 [mm] depth and 16 [mm] in the outer circumferential direction
By providing a notch of about length, a short side of two sides and a long side intersecting at right angles to the both short sides and connecting the both sides are formed, and a recess adjacent to the recess is formed. The outer peripheral surface of the projection portion has a partially curved cylindrical surface, and the rectifying rotation roller uses urethane rubber having a hardness of A80 degrees to A90 degrees.