Sewing machine body

Abstract

A sewing machine body includes a base with an upright part connected to a top of an end of the base and an arm which is connected to a distal end of the upright part. Each of the base, the upright part and the arm includes a hollow interior which is defined by four sidewalls or three sidewalls. Four connection plates are respectively welded to the arm and the upright, and the upright part and the base. The welding seams of the connection plates and the arm and the base are parallel to the arm.

1 . A sewing machine body ( 10 ) comprising: 
 a main frame ( 20 ) composed of a framework ( 200 ) which is composed of a plurality of sidewalls, a hollow interior ( 201 ) partially enclosed by an H-shaped sidewall which forms as a U-shaped cross section.    
   
   
       2 . The sewing machine body as claimed in  claim 1 , wherein the hollow interior ( 201 ) is enclosed by four sidewalls which form as a rectangular cross section.  
   
   
       3 . The sewing machine body as claimed in  claim 1 , wherein the hollow interior ( 201 ) is partially enclosed by three sidewalls which form as a U-shaped cross section.  
   
   
       4 . (canceled)  
   
   
       5 . The sewing machine body as claimed in  claim 1 , wherein the main frame ( 20 ) is composed of a first part ( 21 ), a second part ( 22 ) and a third part ( 23 ), the first part ( 21 ) being received in a base ( 11 ) of the sewing machine body ( 10 ).  
   
   
       6 . The sewing machine body as claimed in  claim 5 , wherein the second part ( 22 ) is connected to between the first part ( 21 ) and the third part ( 23 ), the second part ( 22 ) being received in an upright part ( 12 ) of the sewing machine body ( 10 ).  
   
   
       7 . The sewing machine body as claimed in  claim 6 , wherein the third part ( 23 ) is received in an arm ( 13 ) of the sewing machine body ( 10 ).  
   
   
       8 . The sewing machine body as claimed in  claim 5 , wherein connection plates ( 30 ) are connected to respective sides of the first part ( 21 ), the second part ( 22 ) and the third part ( 23 ).  
   
   
       9 . The sewing machine body as claimed in  claim 8 , wherein the connection plates ( 30 ) are integrally welded to the first part ( 21 ), the second part ( 22 ) and the third part ( 23 ).  
   
   
       10 . The sewing machine body as claimed in  claim 1 , wherein the sidewalls of the framework ( 200 ) are made by boards.