Image forming apparatus

Abstract

An image forming apparatus includes: a main body; a sheet transporting unit provided to a side portion of the main body; and a noise source provided inside of the main body with a rotation portion, wherein the sheet transporting unit includes a plate having a plurality of holes, and an opposing member having a surface opposing the plate, and wherein the noise source, the plate, and the opposing member are disposed in the stated order from inside of the main body to outside of the main body.

1 . An image forming apparatus, comprising:
 a main body;   a sheet transporting unit provided to a side portion of the main body; and   a noise source provided inside of the main body with a rotation portion,   wherein the sheet transporting unit includes a plate having a plurality of holes, and an opposing member having a surface opposing the plate, and   wherein the noise source, the plate, and the opposing member are disposed in the stated order from inside of the main body to outside of the main body.   
     
     
         2 . The image forming apparatus according to  claim 1 , wherein
 the opposing member guides transporting of a sheet with the plate.   
     
     
         3 . The image forming apparatus according to  claim 1 , wherein
 the opposing member is a housing of the sheet transporting unit.   
     
     
         4 . The image forming apparatus according to  claim 1 , wherein expression 1 and expression 2 below are satisfied, where f denotes a frequency of noise generated by the noise source, d denotes a diameter of each of the holes formed in the plate, a denotes a center-to-center distance of the holes which are next to each other in a horizontal direction, b denotes a center-to-center distance of the holes which are next to each other in a vertical direction, h denotes a thickness of the plate, and g denotes a distance between the surface of the opposing member opposing the plate and a surface of the plate opposing the opposing member. 
       
         
           
             
               
                 
                   
                     f 
                     = 
                     
                       
                         C 
                         
                           2 
                            
                           π 
                         
                       
                        
                       
                         
                           β 
                           
                             
                               ( 
                               
                                 h 
                                 + 
                                 
                                   ( 
                                   
                                     π 
                                     / 
                                     4 
                                   
                                   ) 
                                 
                               
                               ) 
                             
                              
                             g 
                           
                         
                       
                     
                   
                 
                 
                   
                     ( 
                     
                       expression 
                        
                       
                           
                       
                        
                       1 
                     
                     ) 
                   
                 
               
               
                 
                   
                     β 
                     = 
                     
                       
                         
                           π 
                            
                           
                             ( 
                             
                               d 
                               / 
                               2 
                             
                             ) 
                           
                         
                         2 
                       
                       ab 
                     
                   
                 
                 
                   
                     ( 
                     
                       expression 
                        
                       
                           
                       
                        
                       2 
                     
                     ) 
                   
                 
               
             
           
         
       
     
     
         5 . The image forming apparatus according to  claim 1 , wherein the plate has a plurality of holes varying in diameter. 
     
     
         6 . The image forming apparatus according to  claim 1 , wherein the plate is disposed to enclose the noise source, and a plurality of different distances between the surface of the opposing member opposing the plate and the surface of the plate opposing the opposing member are set for each portion of the plate. 
     
     
         7 . The image forming apparatus according to  claim 4 , wherein the distance between the surface of the opposing member opposing the plate and the surface of the plate opposing the opposing member is set based on the expression 1 and expression 2 at an intermediate portion of the plate in a direction along a transporting direction of the sheet, and the distance is gradually increased or decreased with a distance from the intermediate portion in the direction along the transporting direction of the sheet. 
     
     
         8 . The image forming apparatus according to  claim 2 , wherein a surface of the plate has a plurality of ribs protruding to a side of a sheet and extending along a transporting direction of the sheet, and the holes are formed between the ribs. 
     
     
         9 . The image forming apparatus according to  claim 1 , wherein the holes are each shaped to extend in a transporting direction of a sheet. 
     
     
         10 . The image forming apparatus according to  claim 1 , wherein the holes are each formed by burring to punch the plate from a side of the opposing member to form a beveling with a cross section of arc on an edge portion on the side of the opposing member. 
     
     
         11 . The image forming apparatus according to  claim 1 , wherein a porous member is formed on the surface of the opposing member opposing the plate. 
     
     
         12 . The image forming apparatus according to  claim 3 , wherein the housing covers the sheet transporting member, and the housing is capable of opening and closing by hinging one side of the housing with the sheet transporting unit.