Cooling device for sewing machines

Abstract

A sewing machine provided with a fan which is formed as an integral part of the handwheel and drive pulley and serves the purpose of drawing air there through for cooling. A shroud and a baffle cooperate to direct the air drawn in by the fan downward and over the bottom cover of the sewing machine which is provided with heat dissipating fins.

We claim: 
     
       1. A cooling device for sewing machines having stitch forming instrumentalities defining a stitch forming area and a frame having a machine chamber means, said cooling device comprising: a main drive shaft means mounted in said frame longitudinally thereof;   a drive pulley means mounted on said drive shaft means, including fan means formed as an integral part thereof;   handwheel means .[.surrounding said fan means and.]. fixedly secured .[.thereto.]. .Iadd.to said fan means.Iaddend., said handwheel means having .[.an.]. .Iadd.a tubular .Iaddend.inlet .[.port.]. .Iadd.passage opening to said fan means and centrally arranged so that air drawn through said inlet passage by said fan means is directed toward and propelled radially outwardly from the central area of said fan means; .Iaddend.   shroud means secured to said frame .[.,.]. and associating with said frame and said handwheel means whereby forming an air chamber means; and   means for directing air discharged from said air chamber means along the bottom of said machine.   
     
     
       2. A cooling device as in claim 1, wherein said fan means is a centrifugal type fan. 
     
     
       3. A cooling device as in claim 1, wherein said inlet port is a coaxial opening in said handwheel means. 
     
     
       4. A cooling device as in claim 1, wherein said means for directing air discharged from said air chamber means along the bottom of the machine is a baffle means secured to said machine frame. 
     
     
       5. A cooling device as in claim 1, further including a bottom cover means which is provided with a plurality of heat dissipating fins. 
     
     
       6. A cooling device as in claim 5 wherein said heat dissipating fins have a first portion means extending parallel to said drive shaft and a second portion means turning in the direction of sewing below the stitch forming area. 
     
     
       7. A cooling device for sewing machines having a frame including a machine chamber means, said cooling device comprising: a drive shaft means mounted in bearing means on said frame longitudinally thereof;   a combined handwheel and drive pulley means carried by said drive shaft means and having .[.at least one.]. .Iadd.centrally arranged air .Iaddend.inlet .[.port.]. means;   a belt guard means secured to said frame about said handwheel and drive pulley means and having shroud means secured thereto whereby forming an air chamber means;   a fan means formed as an integral part of said handwheel and drive pulley means, said fan means being disposed in said air chamber means; and   said shroud means includes baffle means for directing air discharged from said air chamber means along the bottom of said machine.   
     
     
       8. A cooling device as in claim 7 wherein said air chamber means has the form of a spiral, radially in relation to said fan.