Patent Publication Number: US-2020299897-A1

Title: Defibration processing apparatus and fiber processing apparatus

Description:
The present application is based on, and claims priority from JP Application Serial Number 2019-053593, filed Mar. 20, 2019, the disclosure of which is hereby incorporated by reference herein in its entirety. 
     BACKGROUND 
     1. Technical Field 
     The present disclosure relates to a defibration processing apparatus and a fiber processing apparatus. 
     2. Related Art 
     In the related art, in a defibration processing apparatus and a fiber processing apparatus, a raw material is introduced from an introduction port, is defibrated by an inner blade provided on an outer periphery of a rotating body and an outer blade provided on an inner periphery of a stationary member, and is discharged from a discharge port. For example, in JP-A-2015-74848, defibration is performed with the inner blade of the rotating body disposed between the introduction port and the discharge port in a rotation axis direction and the outer blade of the stationary member covering the entire rotating body in the rotation axis direction. 
     In a technology disclosed in JP-A-2015-74848, a defibrated object is discharged from the discharge port after passing through an entire space between the rotating body and the stationary member in the rotation axis direction. Therefore, there is a problem in that it is difficult to efficiently discharge the defibrated object. Further, there is a problem in that when there are many parts where the inner blade of the rotating body and the outer blade of the stationary member face each other, noise is likely to increase during operation of the apparatus. 
     SUMMARY 
     According to an aspect of the present disclosure, there is provided a defibration processing apparatus including: an input port into which a raw material is input; a rotating body that rotates about a rotation center shaft; a stationary member that covers at least part of the rotating body; and a discharge port through which a defibrated object obtained by the rotating body and the stationary member defibrating the raw material is discharged, in which the rotating body has a plurality of rotating blades protruding in a direction away from the rotation center shaft, and the stationary member has a configuration, in which a screen having a plurality of openings is disposed in at least part of the stationary member in a direction of the rotation center shaft and surrounds the rotating body in a rotation direction. 
     In the defibration processing apparatus, the screen may be disposed to surround an entire periphery of the rotating body. 
     In the defibration processing apparatus, the stationary member may include a fixed blade on a surface facing the rotating body in a portion where the screen is not provided. 
     The defibration processing apparatus may further include a discharge path communicating with the discharge port and provided on a side of the stationary member opposite to the rotating body. 
     In the defibration processing apparatus, the screen may be formed of a punched metal plate. 
     In the defibration processing apparatus, the screen may be formed of a cylindrical punched metal plate or a coupling body obtained by combining a plurality of arc-shaped punched metal plates in the rotation direction of the rotating body. 
     The defibration processing apparatus may further include a gas introduction port through which gas is introduced into the defibration processing apparatus and which is formed on a side of the stationary member opposite to the rotating body separately from the input port and the discharge port. 
     In the defibration processing apparatus, the discharge port may be open at a position corresponding to the screen, and the rotating body may be disposed between the discharge port and the gas introduction port. 
     The defibration processing apparatus may further include an air feeding device that feeds the gas and is coupled to the gas introduction port. 
     According to another aspect of the present disclosure, there is provided a fiber processing apparatus including: the defibration processing apparatus according to the aspect; and a processing portion that processes the defibrated object defibrated by the defibration processing apparatus. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         FIG. 1  is a perspective view of a defibration processing apparatus. 
         FIG. 2  is a perspective view of a stationary member. 
         FIG. 3  is a sectional view taken along line III-III of  FIG. 1 . 
         FIG. 4  is a cross-sectional view taken along line IV-IV of  FIG. 1 . 
         FIG. 5  is a perspective view of a stationary member according to a second embodiment. 
         FIG. 6  is a sectional view of a defibration processing apparatus along an axial direction according to the second embodiment. 
         FIG. 7  is a sectional view of a defibration processing apparatus along an axial direction according to a third embodiment. 
         FIG. 8  is a cross-sectional view of the defibration processing apparatus along a radial direction according to the third embodiment. 
         FIG. 9  is a cross-sectional view of a defibration processing apparatus along a radial direction according to a fourth embodiment. 
         FIG. 10  is a sectional view of a defibration processing apparatus along an axial direction according to a fifth embodiment. 
         FIG. 11  is a schematic view illustrating a configuration of a sheet manufacturing apparatus. 
     
    
    
     DESCRIPTION OF EXEMPLARY EMBODIMENTS 
     Hereinafter, exemplary embodiments of the present disclosure will be described in detail with reference to the drawings. Embodiments described below do not limit the content of the present disclosure described in the appended claims. Further, all of configurations described below are not essential constituent requirements of the present disclosure. 
     1. First Embodiment 
     1-1. Configuration of Defibration Processing Apparatus 
       FIG. 1  is a perspective view of a defibration processing apparatus  20 .  FIG. 2  is a perspective view of a stationary member  140 .  FIG. 2  corresponds to a perspective view in which a housing  180  and an upstream cover  190  are omitted from  FIG. 1 . 
     The defibration processing apparatus  20  is an apparatus that performs processing of unwinding a raw material MA, in a state in which a plurality of fibers are bound to each other, into one or a small number of fibers. The defibration processing apparatus  20  is a dry defibration processing apparatus that performs processing such as defibration not in a liquid but in a gas such as the atmosphere and air. 
     As illustrated in  FIGS. 1 and 2 , the defibration processing apparatus  20  according to the present embodiment includes a rotating body  160  that rotates about a rotary shaft  171 , and a stationary member  140  that covers the periphery of the rotating body  160 . Further, the defibration processing apparatus  20  includes the housing  180  that covers and stores the rotating body  160  and the stationary member  140  and covers  190  and  200  that are arranged at both end portions of the housing  180 . 
     The rotary shaft  171  corresponds to an example of a rotation center shaft. 
       FIG. 3  is a sectional view taken along line III-III of  FIG. 1 . 
     The housing  180  of the defibration processing apparatus  20  is formed in a cylindrical shape that extends along the rotary shaft  171  of the rotating body  160 . In the present embodiment, a configuration will be described in which the housing  180  and the like vertically extend according to vertical extension of the rotary shaft  171 . However, the rotary shaft  171  of the rotating body  160  may be configured to extend in the horizontal direction, and accordingly, the housing  180  may also be configured to have an axial center extending in the horizontal direction. In the following description, a direction in which the rotary shaft  171  extends, that is, a direction in which the axial center of the housing  180  and the like extends, is referred to as an axial direction. Further, the center of a rotating body shape such as the rotating body  160  and the stationary member  140  in a radial direction is referred to as an axial center  110 . 
     The upstream cover  190  is supported at one end opening portion  180   a  of the housing  180 . The upstream cover  190  includes an annular lid portion  190   a . The lid portion  190   a  is formed to have the same outer diameter as that of the housing  180 . An annular insertion portion  190   b  that protrudes downward is formed below the lid portion  190   a . In a state in which the insertion portion  190   b  is inserted into the one end opening portion  180   a  of the housing  180 , the upstream cover  190  is fixed to the housing  180 . 
     A cylindrical inlet pipe portion  190   c  extending in the vertical direction is formed at a center of the upstream cover  190  in the radial direction. The inlet pipe portion  190   c  communicates in the vertical direction to cause the inside and the outside of the upstream cover  190  and the housing  180  to communicate with each other. An input port  194  that is opened upward is provided at an upper portion of the inlet pipe portion  190   c . The raw material MA to be defibrated is input to the input port  194 . 
     A discharge port  182  that causes the inside and the outside of the housing  180  to communicate with each other is formed in a storage wall portion  180   c  on a side portion of the housing  180 . The discharge port  182  discharges a defibrated object formed by the rotating body  160  and the stationary member  140  defibrating the raw material MA. An outlet pipe  184  is coupled to the discharge port  182 . The outlet pipe  184  outputs, from the defibration processing apparatus  20 , the defibrated object defibrated by the rotating body  160 . 
     As illustrated in  FIG. 1 , a bearing support portion  191  is formed in an inner peripheral portion on the lower side of the inlet pipe portion  190   c  of the upstream cover  190 . The bearing support portion  191  includes a circular support portion  191   a  and four base portions  191   b  extending from the support portion  191   a  in a cross direction. A bearing  192  that rotatably supports the rotating body  160  is supported by the support portion  191   a  (see  FIG. 3 ). Further, a space  191   c  communicating in the vertical direction is formed between the base portions  191   b , and the raw material MA input from the input port  194  can move into the housing  180  through the space  191   c.    
     As illustrated in  FIG. 3 , the base cover  200  is supported by the other end opening portion  180   b  of the housing  180 . The base cover  200  includes an annular main body portion  200   a . The body portion  200   a  is formed to have the same outer diameter as that of the housing  180 . An annular insertion portion  200   b  that protrudes upward is formed in the main body portion  200   a . In a state in which the insertion portion  200   b  is inserted into the other end opening portion  180   b  of the housing  180 , the base cover  200  is fixed to the housing  180 . A bearing arrangement portion  200   c  that is recessed upward is formed at a center of the base cover  200  in the radial direction. A bearing  201  that supports the rotating body  160  is disposed in the bearing arrangement portion  200   c  via a stay  202 . The stay  202  is fixed to the base cover  200  with a bolt  204 . 
       FIG. 4  is a cross-sectional view taken along line IV-IV of  FIG. 1 . 
     The rotating body  160  is disposed inside the housing  180 . The rotating body  160  includes the rotary shaft  171  and a rotating body main body  161  fixedly supported by the rotary shaft  171 . The rotating body main body  161  is an integrally formed block. The cross-sectional shape of the rotating body main body  161  is a cross shape. The rotating body main body  161  includes a base portion  162  having a hole  162   a  formed therein through which the rotary shaft  171  is inserted, and four defibration inner blades  163  that protrude radially from the base portion  162 . The defibration inner blades  163  correspond to an example of a plurality of rotating blades protruding in a direction in which the rotating blades are spaced apart from the rotary shaft  171 . 
     The rotating body main body  161  can be manufactured by, for example, casting. The rotary shaft  171  and the rotating body main body  161  are fitted in each other via a machine key  164 . The rotary shaft  171  and the rotating body main body  161  can integrally rotate in a circumferential direction. 
     As illustrated in  FIG. 3 , one end side of the rotary shaft  171  is rotatably supported by the bearing  192 . The other end side of the rotary shaft  171  is rotatably supported by the bearing  201 . 
     The rotary shaft  171  is rotationally driven by a drive mechanism that is not illustrated. In the present embodiment, the drive mechanism is configured with a chain and a sprocket, and power is transmitted to the chain and the sprocket from a rotational drive source that is not illustrated, so that the rotary shaft  171  is driven. The configuration in which the rotary shaft  171  is rotationally driven may be implemented not using the chain and the sprocket. 
     The stationary member  140  is disposed outside the rotating body  160  in the radial direction. The stationary member  140  is a member configured in a cylindrical shape extending along the rotary shaft  171  of the rotating body  160 . The stationary member  140  is concentrically disposed to cover the periphery of the rotating body  160  with gaps G 1  and G 2  around the rotating body  160 . 
     The stationary member  140  according to the present embodiment includes, in the axial direction, a fixed outer blade  150  provided on the input port  194  side and a screen  155  provided on the base cover  200  side. The fixed outer blade  150  corresponds to an example of a fixed blade. 
     As illustrated in  FIG. 2 , the fixed outer blade  150  is configured by laminating a plurality of fixed plates  151 . Each fixed plate  151  is a plate-shaped member. The fixed plate  151  has an annular main body portion  151   b  when viewed in the axial direction. Defibration outer blades  152  that protrude in a mountain shape are formed in an inner peripheral portion of the main body portion  151   b  in the radial direction. The defibration outer blades  152  are formed at regular intervals in the circumferential direction. The defibration outer blades  152  form an uneven shape in the circumferential direction. The fixed plate  151  can be formed by punching a cold-rolled steel plate, a steel strip, or the like with a press. 
     In the fixed plate  151 , an inner diameter that is a distance from the axial center  110  to a top portion  152   a  of each defibration outer blade  152  is formed at R 1 . Further, an inner diameter that is a distance from the axial center  110  to a valley portion  152   b  between the defibration outer blades  152  is formed at R 2 . An unevenness difference between the top portion  152   a  and the valley portion  152   b  of the defibration outer blade  152  corresponds to a difference between the inner diameter R 2  and the inner diameter R 1 . 
     The fixed plate  151  is provided with a pair of fixing holes  151   a  penetrated in a thickness direction. A bolt  157  extending in the axial direction is inserted through the fixing hole  151   a . The bolt  157  is fixed to the insertion portion  200   b  of the base cover  200 . 
     As the bolt  157  is inserted, the fixed plate  151  is positioned in the circumferential direction. The plurality of fixed plates  151  are positioned and laminated by the bolts  157 , so that the fixed outer blade  150  is configured. In the present embodiment, the positions of blades of the laminated defibration outer blades  152  coincide with each other, and the top portion  152   a  and the valley portion  152   b  extend in a stripe shape in the axial direction. 
     The screen  155  of the stationary member  140  is provided between the fixed outer blade  150  and the base cover  200 . 
     The screen  155  is configured by a cylindrical punched metal plate  156 . Thus, the stationary member  140  has a configuration in which the screen  155  is disposed around the rotating body  160  in a rotation direction. In detail, the screen  155  is provided over one rotation (the entire one rotation) in the rotation direction. A plurality of circular hole-shaped classification ports  156   a  penetrated in the thickness direction are formed in the punched metal plate  156 . The classification ports  156   a  correspond to an example of a plurality of openings. 
     The classification ports  156   a  according to the present embodiment are formed at regular intervals in the axial direction. Further, the classification ports  156   a  are alternately formed in the circumferential direction. The diameter of the classification ports  156   a  is formed according to the fiber length of the defibrated object to be classified. It is preferable that the diameter of the classification ports  156   a  is equal to or larger than 0.5 mm and equal to or smaller than 2.0 mm. An interval between the adjacent classification ports  156   a  and  156   a  is formed to be about the diameter of the classification ports  156   a.    
     The punched metal plate  156  according to the present embodiment is formed of an integral punched metal plate. However, the punched metal plate  156  may be configured as, for example, a coupling body in which a plurality of arc-shaped punched metal plates are combined with each other in the rotation direction of the rotating body  160 , instead of the integrated configuration. 
     As illustrated in  FIG. 3 , the punched metal plate  156  is disposed to face the discharge port  182 . The punched metal plate  156  is formed such that the entire length thereof in the axial direction is longer than the diameter of the discharge port  182 . The punched metal plate  156  is formed such that the inner diameter R 11  of the inner peripheral surface thereof is larger than the inner diameter R 2  (see  FIG. 2 ) of the valley portion  152   b  of the fixed outer blade  150 . The gap G 2  between the rotating body  160  and the inner peripheral surface of the punched metal plate  156  is larger than the gap G 1  between the rotating body  160  and the fixed outer blade  150 . 
     The outer diameter R 12  of the punched metal plate  156  is formed to be smaller than a distance from the axial center  110  to the bolt  157 . The punched metal plate  156  is pinched and fixed between the fixed outer blade  150  and the base cover  200  in the axial direction. A cylindrical space  121  is formed in a portion pinched between the fixed outer blade  150  and the base cover  200  on the outside of the punched metal plate  156  in the radial direction. The space  121  communicates with a space inside the punched metal plate  156  in the radial direction via the classification ports  156   a  of the punched metal plate  156 . 
     The defibrated object defibrated by the stationary member  140  and the rotating body  160  is configured to be discharged to the space  121  by the classification ports  156   a  of a plurality of the screens  155  provided in the axial direction. 
     The housing  180  is disposed on the outer peripheral side of the stationary member  140 . The discharge port  182  faces the screen  155 , and the space  121  communicates with the discharge port  182 . A discharge path  122  communicating with the discharge port  182  is formed on a side of the stationary member  140  opposite to the rotating body  160  by the cylindrical space  121  between the screen  155  and the housing  180 . 
     The defibrated object discharged to the discharge path  122  moves toward the discharge port  182  while riding on airflow in the discharge path  122 . Then, the defibrated object is discharged from the discharge port  182  of the housing  180  to the outside of the defibration processing apparatus  20 . 
     Here, as illustrated in  FIG. 3 , the input port  194  is formed on one end side of the rotary shaft  171 , whereas the discharge port  182  is formed on the other end side of the rotary shaft  171  from a central portion in the axial direction. The raw material MA input from the input port  194  is configured to the defibrated while moving between the stationary member  140  and the rotating body  160  along the axial direction of the rotary shaft  171 . 
     1-3. Operation of Defibration Processing Apparatus 
     Next, an operation of the defibration processing apparatus  20  will be described. The defibration processing apparatus  20  rotates the rotary shaft  171  to rotate the rotating body  160  and guides the raw material MA to the gaps G 1  and G 2  between the rotating body  160  and the stationary member  140  by the airflow, thereby dry-defibrating the raw material MA. 
     In the present embodiment, the raw material MA input from the input port  194  of the defibration processing apparatus  20  is introduced into the housing  180  through the inlet pipe portion  190   c  of the upstream cover  190 . Inside the housing  180 , the rotating body  160  rotates, and the raw material MA is sent to the gap G 1  between the defibration inner blade  163  of the rotating body  160  and the fixed outer blade  150  of the stationary member  140 . The raw material MA sent to the gap G 1  flies by receiving a centrifugal force from the rotating body  160 , collides with the fixed outer blade  150 , and is unwound and defibrated. 
     Further, even in the gap G 2  between the defibration inner blade  163  of the rotating body  160  and the screen  155  of the stationary member  140 , the raw material MA can collide with the screen  155  and be defibrated. The raw material MA that has been defibrated and thus has a sufficiently short fiber length, that is, the defibrated object, is output from the inside of the stationary member  140  through the classification ports  156   a  of the screen  155  by the centrifugal force received from the rotating body  160  and the airflow. The defibrated object output from the stationary member  140  is discharged from the discharge port  182  through the discharge path  122 , and is output to the outside of the defibration processing apparatus  20 . 
     The stationary member  140  according to the present embodiment includes the fixed outer blade  150  on the input port  194  side in the axial direction and the screen  155  on the discharge port  182  side. Thus, the raw material MA that has not yet been defibrated immediately after being input from the input port  194  can be defibrated by the fixed outer blade  150 , and thus the raw material MA is easily defibrated. Further, on the screen  155  on the discharge port  182  side, the defibrated raw material MA is output to the outside of the stationary member  140  through the classification ports  156   a  by receiving the centrifugal force from the rotating body  160  or the airflow. On the other hand, the raw material MA that is insufficiently defibrated and has a long fiber length, that is, an undefibrated object, is not output from the classification ports  156   a , but is defibrated in the gap G 2  between the screen  155  and the defibration inner blade  163 . That is, the raw material MA can be easily output in order from the defibrated raw material MA by the screen  155  and can be classified. 
     In a configuration according to the related art, a rotating body is disposed between an introduction port and a discharge port in a rotation axis direction, and a defibration outer blade of a stationary member is disposed to cover the entire the outer periphery of a defibration inner blade of the rotating body in the rotation axis direction. Thus, the defibrated object is discharged from the discharge port after passing through the entire space between the rotating body and the stationary member along the rotation axis direction, regardless of a progress state of the defibration. Therefore, it is difficult to efficiently discharge the defibrated object. 
     Further, when an unevenness difference of the inner surface of the stationary member is large as in the defibration outer blade, fluctuation of an internal pressure when the defibration inner blade of the rotating body rotates to pass through the defibration outer blade easily increases, and the stationary member vibrates or the air vibrates, resulting in an increase in noise. Then, in this noise, as there are more portions where the defibration inner blade of the rotating body and the defibration outer blade of the stationary member face each other, the noise easily increases during an operation of the apparatus. 
     On the other hand, in the present embodiment, part of the stationary member  140  in the axial direction is configured with the screen  155 . Therefore, as compared to a case where the fixed outer blade  150  is provided on the entire inner surface of the stationary member  140  in the axial direction, unevenness of the inner surface of the stationary member  140  is suppressed. In particular, the screen  155  is disposed in a cylindrical shape, and in a portion where the screen  155  is disposed, pressure fluctuation by the rotation of the rotating body  160  easily decreases in the entire circumferential direction. Therefore, the fixed outer blade  150  provided in the stationary member  140  is suppressed to the minimum as needed, and the screen  155  that classifies and extracts the defibrated object is provided, so that improvement in classification efficiency and improvement in quietness in the defibration processing apparatus  20  can be implemented. 
     As described above, the defibration processing apparatus  20  according to the present embodiment includes the input port  194  into which the raw material MA is input, the rotating body  160  that rotates about the rotary shaft  171 , and the stationary member  140  that covers a lower portion as part of the rotating body  160 . Further, the defibration processing apparatus  20  includes the discharge port  182  that discharges the defibrated object obtained by defibrating the raw material MA between the rotating body  160  and the stationary member  140 . In the defibration processing apparatus  20 , the rotating body  160  has the plurality of defibration inner blades  163  that protrude in a direction in which the defibration inner blades  163  are spaced apart from the rotary shaft  171 . Further, the stationary member  140  has a configuration in which the screen  155  is disposed around one rotation of the rotating body  160  in the rotation direction in a portion of the rotary shaft  171  in the axial direction. The screen  155  is configured with the punched metal plate  156  having the plurality of classification ports  156   a . Therefore, the improvement in the classification efficiency and the improvement in the quietness in the defibration processing apparatus  20  can be implemented. 
     Further, in the present embodiment, the stationary member  140  includes the fixed outer blade  150  in a portion where the screen  155  is not provided, that is, on a surface facing the rotating body  160  on the input port  194  side in the axial direction. Therefore, the fixed outer blade  150  is provided, so that the defibration can be more efficiently performed. 
     Further, in the present embodiment, the discharge path  122  communicating with the discharge port  182  is provided on a side of the stationary member  140  opposite to the rotating body  160  in the axial direction. Therefore, the defibrated object can be smoothly discharged by the discharge path  122 . 
     Further, in the present embodiment, the screen  155  is formed of the punched metal plate  156 . Therefore, the stationary member  140  can have a simple configuration, and can be made inexpensive. 
     Further, in the present embodiment, the screen  155  is formed of the cylindrical punched metal plate  156 . Therefore, the stationary member  140  can have a simple configuration, and can be made inexpensive. 
     2. Second Embodiment 
     2-1. Configuration of Defibration Processing Apparatus 
     Next, a second embodiment of the present disclosure will be described. The same components as those according to the first embodiment are designated by the same reference numerals, and description thereof will be omitted. 
       FIG. 5  is a perspective view of a stationary member  240  according to a second embodiment.  FIG. 6  is a sectional view of a defibration processing apparatus  220  along an axial direction according to the second embodiment.  FIG. 5  corresponds to  FIG. 2  of the first embodiment, and  FIG. 6  corresponds to  FIG. 3  of the first embodiment. 
     The defibration processing apparatus  220  according to the second embodiment includes a stationary member  240  instead of the stationary member  140  according to the first embodiment. In the stationary member  240  according to the second embodiment, the fixed outer blade  150  is omitted, and the entirety thereof in the axial direction is configured with a screen  255 . The screen  255  of the stationary member  240  is disposed to surround the entire periphery of the rotating body  160 . The screen  255  is configured by an integral cylindrical punched metal plate  256 . A plurality of classification ports  256   a  are formed in the punched metal plate  256 . The plurality of classification ports  256   a  are formed over the entirety of the punched metal plate  256  in the axial direction. The punched metal plate  256  according to the second embodiment is configured in the same manner as the punched metal plate  156  according to the first embodiment except the length in the axial direction. 
     2-2. Operation of Defibration Processing Apparatus 
     In the defibration processing apparatus  220  according to the second embodiment, when the raw material MA is input from the input port  194  of the defibration processing apparatus  220 , the raw material MA is defibrated in the gap G 2  between the rotating body  160  and the stationary member  240 , which is like the first embodiment. That is, in the present embodiment, while the raw material MA is defibrated in the gap G 2  between the punched metal plate  256  and the rotating body  160 , the defibrated object is discharged to the discharge path  122  through the classification ports  256   a . In the present embodiment, the stationary member  240  does not include a defibration outer blade, and a unevenness difference on the entire inner peripheral surface of the stationary member  240  decreases. When the defibration inner blade  163  of the rotating body  160  rotates on the inner periphery of the stationary member  240 , pressure vibration according to a change in an internal pressure can be suppressed in the entire axial direction, and uneven discharge of the defibrated object and occurrence of noise can be suppressed. Therefore, even in the present embodiment, by providing the screen  255  having a small unevenness difference and classifying and extracting the defibrated object, the improvement in the classification efficiency and the quietness in the defibration processing apparatus  220  can be implemented. 
     As described above, the defibration processing apparatus  220  according to the present embodiment includes the input port  194  into which the raw material MA is input, the rotating body  160  that rotates about the rotary shaft  171 , and the stationary member  240  that covers the rotating body  160 . Further, the defibration processing apparatus  20  includes the discharge port  182  that discharges the defibrated object obtained by defibrating the raw material MA between the rotating body  160  and the stationary member  240 . In the defibration processing apparatus  220 , the rotating body  160  has a plurality of defibration inner blades  163  the protrude in a direction in which the defibration inner blades  163  are spaced apart from the rotary shaft  171 , and the stationary member  240  has a configuration in which the screen  255  is disposed around one rotation of the rotating body  160  in the rotation direction in the axial direction of the rotary shaft  171 . The screen  255  is configured with the punched metal plate  256  and has the plurality of classification ports  256   a . Therefore, even in the present embodiment, similar to the first embodiment, the improvement in the classification efficiency and the improvement in the quietness in the defibration processing apparatus  220  can be implemented. 
     Further, in the present embodiment, the screen  255  is disposed to surround the entire periphery of the rotating body  160 . Accordingly, the entire periphery of the entire rotating body  160  in the axial direction is covered with the screen  255 , and the entire defibration inner blades  163  face the screen  255 , so that the uneven discharge of the defibrated object and the occurrence of the noise can be suppressed. 
     3. Third Embodiment 
     3-1. Configuration of Defibration Processing Apparatus 
     Next, a third embodiment of the present disclosure will be described. The same components as those according to the first embodiment are designated by the same reference numerals, and description thereof will be omitted. 
       FIG. 7  is a sectional view of a defibration processing apparatus  320  along an axial direction according to the third embodiment.  FIG. 8  is a cross-sectional view of a defibration processing apparatus  320  along a radial direction according to the third embodiment.  FIG. 7  corresponds to  FIG. 3  of the first embodiment, and  FIG. 8  corresponds to  FIG. 4  of the first embodiment. 
     The defibration processing apparatus  320  according to the third embodiment has a housing  380  instead of the housing  180  according to the first embodiment. In addition to the input port  194  and the discharge port  182 , an opening-like gas introduction port  385  the causes the inside and the outside of the housing  380  to communicate with each other is formed in the storage wall portion  180   c  of the housing  380 . 
     The gas introduction port  385  introduces gas into the defibration processing apparatus  320 . The gas introduction port  385  is provided on a side of the stationary member  140  opposite to the rotating body  160 . In the present embodiment, the gas introduction port  385  is provided outside the stationary member  140  in the radial direction, and on a side of the rotating body  160  opposite to the discharge port  182 . The gas introduction port  385  is open at a position facing the screen  155 . The gas introduction port  385  communicates with the discharge path  122 . 
     The diameter of the gas introduction port  385  is formed to be equal to the diameter of the discharge port  182 . A gas introduction pipe  386  is coupled to the gas introduction port  385 . A blower  387  that sends gas to the gas introduction port  385  is coupled to the gas introduction pipe  386 . The blower  387  corresponds to an example of an air feeding device. The blower  387  introduces the gas from the gas introduction port  385  to the discharge path  122  via the gas introduction pipe  386 . 
     3-2. Operation of Defibration Processing Apparatus 
     In the defibration processing apparatus  320  according to the third embodiment, similar to the first embodiment, the screen  155  that classifies and extracts the defibrated object is provided. Therefore, the fixed outer blade  150  provided in the stationary member  140  is suppressed to the minimum as needed, so that the improvement in the classification efficiency and the improvement in the quietness in a defibration machine can be implemented. 
     Further, in the present embodiment, the gas introduction port  385  communicates with the discharge path  122 , and the blower  387  is coupled to the gas introduction port  385 . Thus, airflow from the gas introduction port  385  to the discharge port  182  can be applied to the discharge path  122 , and the defibrated object discharged to the discharge path  122  can be discharged by the airflow from the blower  387 . Further, the blower  387  is located at a position that is different from the discharge path  122 , and the blower  387  is upstream of the airflow. Therefore, it is prevented that since the defibrated object flows into the blower  387 , air supply capability of the blower  387  is reduced. 
     As described above, the defibration processing apparatus  320  according to the present embodiment includes the input port  194  into which the raw material MA is input, the rotating body  160  that rotates about the rotary shaft  171 , and the stationary member  140  that covers the rotating body  160 . Further, the defibration processing apparatus  320  includes the discharge port  182  that discharges the defibrated object obtained by defibrating the raw material MA between the rotating body  160  and the stationary member  140 . In the defibration processing apparatus  320 , the rotating body  160  has the plurality of defibration inner blades  163  that protrude in a direction in which the defibration inner blades  163  are spaced apart from the rotary shaft  171 . Further, the stationary member  140  has a configuration in which the screen  155  is disposed around one rotation of the rotating body  160  in the rotation direction in a portion of the rotary shaft  171  in the axial direction. The screen  155  is configured with the punched metal plate  156  and has the plurality of classification ports  156   a . Therefore, even in the present embodiment, similar to the first embodiment, the improvement in the classification efficiency and the improvement in the quietness in the defibration processing apparatus  320  can be implemented. 
     Further, in the present embodiment, the gas introduction port  385  through which the gas is introduced into the defibration processing apparatus  320  is provided on a side of the stationary member  140  opposite to the rotating body  160  separately from the input port  194  and the discharge port  182 . Therefore, the airflow that discharges the defibrated object can be applied to the discharge path  122 , and the defibrated object can be discharged efficiently. 
     Further, in the present embodiment, the discharge port  182  is open at a position corresponding to the screen  155 , and the rotating body  160  is disposed between the discharge port  182  and the gas introduction port  385 . Therefore, instead of applying the airflow from the middle of the discharge path  122 , the airflow that discharges the defibrated object is applied over one rotation of the rotating body  160  in the rotation direction. Therefore, the defibrated object can be discharged more efficiently. 
     Further, in the present embodiment, the blower  387  that sends the gas to the gas introduction port  385  is coupled. Therefore, the blower  387  can be an upstream portion of the gas introduction port  385 , and while the defibrated object is prevented from being clogged in the blower  387 , the airflow can easily flow into the discharge path  122 , so that the defibrated object can be efficiently discharged. 
     4. Fourth Embodiment 
     4-1. Configuration of Defibration Processing Apparatus 
     Next, a fourth embodiment of the present disclosure will be described. The same components as those according to the third embodiment are designated by the same reference numerals, and description thereof will be omitted. 
       FIG. 9  is a cross-sectional view of a defibration processing apparatus  420  along a radial direction according to the fourth embodiment.  FIG. 9  corresponds to  FIG. 8  according to the third embodiment. 
     The defibration processing apparatus  420  according to the present embodiment has a housing  480  instead of the housing  380  according to the third embodiment. The storage wall portion  180   c  of the housing  480  according to the fourth embodiment has a bulging portion  480   c  formed in a portion thereof facing the screen  155 . The bulging portion  480   c  has a shape that bulges in a radial direction with respect to the storage wall portion  180   c , and bulges from the gas introduction port  385  toward the discharge port  182  in the radial direction. In detail, the diameter R 31  from the axial center  110  to the inner peripheral surface of the bulging portion  480   c  is formed to increase from the gas introduction port  385  to the discharge port  182 . A discharge path  422  is formed between the bulging portion  480   c  of the storage wall portion  180   c  and the stationary member  140 . As the discharge path  422  goes from the gas introduction port  385  to the discharge port  182 , the cross-section of the discharge path  422  becomes large. 
     4-2. Operation of Defibration Processing Apparatus 
     In the defibration processing apparatus  420  according to the fourth embodiment, when the raw material MA is input from the input port  194  of the defibration processing apparatus  420 , the raw material MA is defibrated in the gaps G 1  and G 2  between the rotating body  160  and the stationary member  140 , which is like the first embodiment. Therefore, similar to the first embodiment, the fixed outer blade  150  provided in the stationary member  140  is suppressed to the minimum as needed, and an installation ratio of the screen  155  that classifies and extracts the defibrated object increases, so that the improvement in the classification efficiency and the improvement in the quietness in the defibration machine can be implemented. Further, even in the discharge path  422  according to the fourth embodiment, similar to the discharge path  122  according to the third embodiment, the airflow for discharging the defibrated object can be applied, and the defibrated object can be efficiently discharged. 
     In the discharge path  422  according to the present embodiment, the cross-section thereof becomes larger from the gas introduction port  385  to the discharge port  182 . The defibrated object flows into the discharge path  422  through the classification ports  156   a  of the screen  155 . Therefore, the defibrated object in the discharge path  422  increases downstream of the discharge path  422 . However, in the present embodiment in which the cross-section of the discharge path  422  becomes larger toward the discharge port  182 , even when the amount of the defibrated object is large, the inside of the discharge path  422  is not easily blocked, and the airflow is easily stabilized. Therefore, the defibrated object can be efficiently discharged. 
     The defibration processing apparatus  420  according to the present embodiment includes the input port  194  into which the raw material MA is input, the rotating body  160  that rotates about the rotary shaft  171 , and the stationary member  140  that covers the rotating body  160 . Further, the defibration processing apparatus  420  includes the discharge port  182  that discharges the defibrated object obtained by defibrating the raw material MA between the rotating body  160  and the stationary member  140 . In the defibration processing apparatus  420 , the rotating body  160  has the plurality of defibration inner blades  163  that protrude in a direction in which the defibration inner blades  163  are spaced apart from the rotary shaft  171 . Further, the stationary member  140  has a configuration in which the screen  155  is disposed around one rotation of the rotating body  160  in the rotation direction in a portion of the rotary shaft  171  in the axial direction. The screen  155  is configured with the punched metal plate  156  and has the plurality of classification ports  156   a . Therefore, even in the present embodiment, similar to the first embodiment, the improvement in the classification efficiency and the improvement in the quietness in the defibration processing apparatus  320  can be implemented. 
     5. Fifth Embodiment 
     5-1. Configuration of Defibration Processing Apparatus 
     Next, a fifth embodiment of the present disclosure will be described. The same components as those according to the third embodiment are designated by the same reference numerals, and description thereof will be omitted. 
       FIG. 10  is a sectional view of a defibration processing apparatus  520  along an axial direction according to the fifth embodiment.  FIG. 10  corresponds to  FIG. 7  according to the third embodiment. 
     The defibration processing apparatus  520  according to the present embodiment includes a stationary member  540  and a housing  580  instead of the stationary member  140  and the housing  380  according to the third embodiment. The stationary member  540  includes, in the axial direction, a first fixed outer blade  550 A provided on the input port  194  side, a second fixed outer blade  550 B provided on the base cover  200  side, and a screen  555  disposed between the first fixed outer blade  550 A and the second fixed outer blade  550 B. 
     Similar to the fixed outer blade  150  according to the first embodiment, the first fixed outer blade  550 A and the second fixed outer blade  550 B are configured by laminating the fixed plates  151 . Further, similar to the screen  155  according to the first embodiment, the screen  555  is formed of the punched metal plate  156 . The first fixed outer blade  550 A and the second fixed outer blade  550 B are supported by the bolts  157 . Further, the screen  555  is pinched and fixed between the first fixed outer blade  550 A and the second fixed outer blade  550 B. 
     The gas introduction port  385  and the discharge port  182  are formed in the storage wall portion  180   c  of the housing  580 . The gas introduction port  385  and the discharge port  182  are formed to face the screen  555 . The housing  580  according to the fifth embodiment is the same as the housing  380  according to the third embodiment except that the formation positions of the gas introduction port  385  and the discharge port  182  are different from each other. 
     5-2. Operation of Defibration Processing Apparatus 
     In the defibration processing apparatus  520  according to the fifth embodiment, when the raw material MA is input from the input port  194  of the defibration processing apparatus  520 , the raw material MA is defibrated in the gaps G 1  and G 2  between the rotating body  160  and the stationary member  540 , which is like the first embodiment. That is, the stationary member  540  according to the present embodiment includes the first fixed outer blade  550 A on the input port  194  side in the axial direction, the screen  155  facing the discharge port  182 , and the second fixed outer blade  550 B on the base cover  200  side. 
     Thus, the raw material MA that has not yet been defibrated immediately after being input from the input port  194  can be defibrated by the first fixed outer blade  550 A, and thus the raw material MA is easily defibrated. 
     Further, in the screen  555  on the discharge port  182  side, the defibrated raw material MA is output to the outside of the stationary member  540  through the classification ports  156   a  under an action of the centrifugal force from the rotating body  160  and the airflow. 
     On the other hand, the undefibrated object is not output from the classification ports  156   a . When the undefibrated object that is not output moves to the base cover  200  side, the undefibrated object can be defibrated in the gap G 1  between the second fixed outer blade  550 B and the defibration inner blade  163  of the rotating body  160 . Thus, the stationary member  540  includes a screen  555  that classifies and extracts the defibrated object in the middle of the axial direction. Accordingly, the fixed outer blades  550 A and  550 B provided in the stationary member  540  are suppressed to the minimum as needed, so that the improvement in the classification efficiency and the improvement in the quietness in the defibration machine can be implemented. 
     As described above, the defibration processing apparatus  520  according to the present embodiment includes the input port  194  into which the raw material MA is input, the rotating body  160  that rotates about the rotary shaft  171 , and the stationary member  540  that covers the rotating body  160 . Further, the defibration processing apparatus  520  includes the discharge port  182  that discharges the defibrated object obtained by defibrating the raw material MA between the rotating body  160  and the stationary member  540 . In the defibration processing apparatus  520 , the rotating body  160  has the plurality of defibration inner blades  163  that protrude in a direction in which the defibration inner blades  163  are spaced apart from the rotary shaft  171 . Further, the stationary member  540  has a configuration in which the screen  555  is disposed around one rotation of the rotating body  160  in the rotation direction in a central portion of the rotary shaft  171  in the axial direction. The screen  555  is configured with the punched metal plate  156  and has the plurality of classification ports  156   a . Therefore, even in the present embodiment, similar to the first embodiment, the improvement in the classification efficiency and the improvement in the quietness in the defibration processing apparatus  520  can be implemented. 
     6. Sixth Embodiment 
     6-1. Entire Configuration of Sheet Manufacturing Apparatus 
     Next, a sixth embodiment of the present disclosure will be described. The same components as those according to the first embodiment are designated by the same reference numerals, and description thereof will be omitted. 
       FIG. 11  is a schematic view illustrating a configuration of a sheet manufacturing apparatus  100 . 
     The sheet manufacturing apparatus  100  executes a regeneration process in which the raw material MA containing fibers is made into a fiber and is regenerated into a new sheet S. The sheet manufacturing apparatus  100  corresponds to an example of a fiber processing apparatus. 
     The sheet manufacturing apparatus  100  includes a storage supply portion  10 , a crushing portion  12 , a defibration portion  620 , a sorting portion  40 , a first web forming portion  45 , a rotating body  49 , a mixing portion  50 , an accumulation portion  60 , a second web forming portion  70 , a transport portion  79 , a sheet forming portion  80 , and a cutting portion  90 . 
     The defibration portion  620  of the sheet manufacturing apparatus  100  is configured with the defibration processing apparatus  20  according to the first embodiment. 
     The sorting portion  40 , the first web forming portion  45 , the rotating body  49 , the mixing portion  50 , the accumulation portion  60 , the second web forming portion  70 , the transport portion  79 , the sheet forming portion  80 , and the cutting portion  90  correspond to examples of a processing portion that processes the defibrated object defibrated by the defibration processing apparatus, respectively. 
     The storage supply portion  10  is an automatic input apparatus that stores the raw material MA and continuously inputs the raw material MA to the crushing portion  12 . The raw material MA preferably contains fiber and is, for example, a waste paper, a disposal paper, and a pulp sheet. 
     The crushing portion  12  includes a crushing blade  14  that cuts the raw material MA supplied by the storage supply portion  10 , and cuts the raw material MA in the air by the crushing blade  14  to make squire strips of several centimeters. The crushing portion  12  can use, for example, a paper shredder. The raw material MA cut by the crushing portion  12  is collected by a hopper  9  and is transported to the input port  194  (see  FIG. 3 ) of the defibration portion  620  via a pipe  2 . 
     Crushed pieces are transported from the crushing portion  12  to the defibration portion  620  by the airflow. In the defibration portion  620 , the crushed pieces are input from the input port  194 , and the crushed pieces are defibrated between the rotating body  160  and the stationary member  140 . The defibrated crushed pieces, that is, the defibrated object, is output through the discharge port  182 . The defibrated object is transferred from the defibration portion  620  via a pipe  3  coupled to the outlet pipe  184  (see  FIG. 3 ) to the sorting portion  40 . 
     The sorting portion  40  sorts components contained in the defibrated object according to the size of the fiber. The sorting portion  40  has a drum portion  41  and a housing portion  43  that stores the drum portion  41 . The drum portion  41  uses, for example, a sieve. 
     The defibrated object introduced from an introduction port  42  into the drum portion  41  is divided, through rotation of the drum portion  41 , into a passing object that passes through an opening of the drum portion  41  and a residual object that does not pass through the opening. A first sorting object that is the passing object passing through the opening descends inside the housing portion  43  toward the first web forming portion  45 . 
     Further, a second sorting object that is the residual object not passing through the opening is retransferred from the discharge port  44  communicating with the inside of the drum portion  41  via a pipe  8  to the input port  194  of the defibration portion  620 . 
     The first web forming portion  45  includes a mesh belt  46 , a stretching roller  47 , and a suction portion  48 . The mesh belt  46  is an endless metal belt, and is stretched around a plurality of stretching rollers  47 . The mesh belt  46  orbits on a trajectory configured by the stretching rollers  47 . Part of the trajectory of the mesh belt  46  is flat below the drum portion  41 , and the mesh belt  46  constitutes a flat surface. The suction portion  48  corresponds to a suction mechanism. 
     A large number of openings are formed in the mesh belt  46 . A component, which is larger than the opening of the mesh belt  46  among the first sorting object that descends from the drum portion  41  located above the mesh belt  46 , is accumulated on the mesh belt  46 . Further, a component, which is smaller than the opening of the mesh belt  46  among the first sorting object, passes through the opening. 
     The suction portion  48  includes a blower that is not illustrated, and suctions air from a side of the mesh belt  46  opposite to the drum portion  41 . The component passing through the opening of the mesh belt  46  is suctioned by the suction portion  48 . The airflow suctioned by the suction portion  48  attracts the first sorting object descending from the drum portion  41  to the mesh belt  46 , thereby promoting the accumulation. 
     The component accumulated in the mesh belt  46  has a web shape, and constitutes a first web W 1 . Basic configurations of the mesh belt  46 , the stretching rollers  47 , and the suction portion  48  are the same as those of a mesh belt  72 , stretching rollers  74 , and a suction mechanism  76  of the second web forming portion  70 , which will be described below. 
     The first web W 1  is transported to the rotating body  49  as the mesh belt  46  moves. 
     The rotating body  49  includes a base portion  49   a  coupled to a drive portion that is not illustrated, such as a motor, and a protrusion portion  49   b  protruding from the base portion  49   a . As the base portion  49   a  rotates in a direction D, the protrusion portion  49   b  rotates about the base portion  49   a.    
     The rotating body  49  is located at an end portion of the planar portion of the trajectory of the mesh belt  46 . Since the trajectory of the mesh belt  46  is bent downward at this end portion, the first web W 1  transported by the mesh belt  46  protrudes from the mesh belt  46  and comes into contact with the rotating body  49 . As the protrusion portion  49   b  collides with the first web W 1 , the first web W 1  is unwound, and becomes a lump of small fibers. This lump passes through a pipe  7  located below the rotating body  49  and is transported to the mixing portion  50 . 
     The mixing portion  50  mixes the first sorting object and additives with each other. The mixing portion  50  has an additive supply portion  52  that supplies the additives, a pipe  54  that transports the first sorting object and the additives, and a mixing blower  56 . 
     The additive supply portion  52  supplies, to the pipe  54 , the additives containing fine powder or fine particles inside an additive cartridge  52   a.    
     The additives supplied from the additive supply portion  52  contains a resin, that is, a binder, for binding a plurality of fibers. The resin contained in the additives is melted when passing through the sheet forming portion  80 , and binds the plurality of fibers. 
     The mixing blower  56  generates airflow in the pipe  54  that couples the pipe  7  and the accumulation portion  60  to each other. Further, the first sorting object transported from the pipe  7  to the pipe  54  and the additives supplied to the pipe  54  by the additive supply portion  52  are mixed with each other when passing through the mixing blower  56 . 
     The accumulation portion  60  unwinds fibers of the mixture, and descends the fibers to the second web forming portion  70  while dispersing the fibers in the air. When the additives supplied from the additive supply portion  52  is in the form of fibers, these fibers are also unwound by the accumulation portion  60 , and descend to the second web forming portion  70 . 
     The accumulation portion  60  has a drum portion  61  and a housing portion  63  that stores the drum portion  61 . The drum portion  61  is, for example, a cylindrical structure that is configured similarly to the drum portion  41 , is rotated by power of a motor that is not illustrated similarly to the drum portion  41 , and functions as a sieve. 
     The second web forming portion  70  is disposed below the drum portion  61 . The second web forming portion  70  has, for example, the mesh belt  72 , the stretching rollers  74 , and the suction mechanism  76 . 
     A component, which is larger than the opening of the mesh belt  72  among the mixture that descends from the drum portion  61  located above the mesh belt  72 , is accumulated on the mesh belt  72 . The component accumulated in the mesh belt  72  has a web shape, and constitutes a second web W 2 . 
     In a transport path of the mesh belt  72 , a humidity control portion  78  is provided downstream of the accumulation portion  60 . The humidity control portion  78  is a mist type humidifier that supplies water in the form of a mist toward the mesh belt  72 . The humidity control portion  78  includes, for example, a tank that stores water, and an ultrasonic wave vibrator that makes the water into mist. Since the water content of the second web W 2  is adjusted by the mist supplied from the humidity control portion  78 , an effect of suppressing adsorption of fibers to the mesh belt  72  due to static electricity can be expected. 
     The second web W 2  is peeled off from the mesh belt  72  by the transport portion  79 , and is transported to the sheet forming portion  80 . The transport portion  79  has, for example, a mesh belt  79   a , a roller  79   b , and a suction mechanism  79   c . The suction mechanism  79   c  includes a blower that is not illustrated, and generates an upward airflow through the mesh belt  79   a  by a suction force of the blower. Due to this airflow, the second web W 2  is separated from the mesh belt  72  and is adsorbed to the mesh belt  79   a . The mesh belt  79   a  moves by rotation of the roller  79   b , and transports the second web W 2  to the sheet forming portion  80 . 
     Similar to the mesh belt  46  and the mesh belt  72 , the mesh belt  79   a  can be formed of an endless metal belt having an opening. 
     The sheet forming portion  80  applies heat to the second web W 2 , so that a first sorting object-derived fiber contained in the second web W 2  is bound by the resin contained in the additives. 
     The sheet forming portion  80  includes a pressurizing portion  82  that pressurizes the second web W 2  and a heating portion  84  that heats the second web W 2  pressurized by the pressurizing portion  82 . The pressurizing portion  82  pressurizes the second web W 2  with a predetermined nip pressure by calendar rollers  85  and  85 , and transports the second web W 2  toward the heating portion  84 . The heating portion  84  applies heat to the second web W 2  densified by a pair of heating rollers  86  and  86 , and transports the second web W to the cutting portion  90 . In the heating portion  84 , the second web W 2  is heated at a temperature that is higher than a glass transition point of the resin contained in the second web W 2 , and thus becomes a sheet S. 
     The cutting portion  90  cuts the sheet S formed by the sheet forming portion  80 . The cutting portion  90  includes a first cutting portion  92  that cuts the sheet S in a direction intersecting a transport direction of the sheet S as indicated by symbol F and a second cutting portion  94  that cuts the sheet S in a direction parallel to the transport direction F. The cutting portion  90  cuts the length and the width of the sheet S into a predetermined size to form a single sheet S. The sheet S cut by the cutting portion  90  is stored in the discharge portion  96 . 
     As described above, the sheet manufacturing apparatus  100  according to the present embodiment includes the defibration portion  620 , the sorting portion  40  that processes the defibrated object defibrated by the defibration portion  620 , the first web forming portion  45 , the rotating body  49 , and the mixing portion  50 . Further, the sheet manufacturing apparatus  100  according to the present embodiment includes the accumulation portion  60 , the second web forming portion  70 , the transport portion  79 , the sheet forming portion  80 , and the cutting portion  90 . In the sheet manufacturing apparatus  100  according to the present embodiment, the improvement in the classification efficiency and the improvement in the quietness in the defibration portion  620  can be implemented. 
     The defibration portion  620  may be configured with any of the defibration processing apparatus  220 ,  320 ,  420 , and  520  according to the second to fifth embodiments, instead of the defibration processing apparatus  20  according to the first embodiment. 
     7. Another Embodiment 
     Each of the above-described embodiments is merely a specific aspect for implementing the present disclosure disclosed in the appended claims, and does not limit the present disclosure. Further, various following aspects can be implemented within departing from the subject matter. 
     In the above-described embodiments, the configuration in which the rotating body  160  includes the rotating body main body  161  as a block has been described. However, the rotating body main body  161  may be configured by laminating a plurality of plates.