Yarn end suction device of loom

Abstract

To provide a yarn end suction device of a loom, which can suppress a fluid consumption amount and prevent occurrence of a cutting error when sucking a weft yarn via a suction mouth disposed near the outside of a weaving end and discharging an unnecessary yarn end portion cut by a cutter to the exterior. In a yarn end suction device ( 1 ) of a loom, a weft yarn ( 2 a ) carried by a beating motion is sucked and captured via a suction mouth ( 5 ) disposed near the outside of a weaving end, then the weft yarn ( 2 a ) is cut by a cutter ( 4 ) provided between the weaving end and the suction mouth ( 5 ), and thereafter, a weft yarn end portion ( 2 b ) is discharged to the exterior. The suction mouth ( 5 ) has a suction port ( 7 ) that is formed so as to have a polygonal cross-sectional shape at its end portion, and one corner ( 8 a ) thereof is disposed so as to be directed toward the weaving end side.

What is claimed is:  
     
         1 . A yarn end suction device of a loom, wherein a weft yarn ( 2   a ) carried by a beating motion is sucked and captured via a suction mouth ( 5 ) disposed near the outside of a weaving end, then the weft yarn ( 2   a ) is cut by a cutter ( 4 ) provided between the weaving end and the suction mouth ( 5 ), and thereafter, a weft yarn end portion ( 2   b ) is discharged to the exterior, said yarn end suction device ( 1 ) characterized in that 
 said suction mouth ( 5 ) has a suction port ( 7 ) that is formed so as to have a polygonal cross-sectional shape at its end portion, and one corner ( 8   a ) thereof is disposed so as to be directed toward the weaving end side.    
     
     
         2 . A yarn end suction device of a loom, wherein a weft yarn ( 2   a ) carried by a beating motion is sucked and captured via a suction mouth ( 5 ) disposed near the outside of a weaving end, then the weft yarn ( 2   a ) is cut by a cutter ( 4 ) provided between the weaving end and the suction mouth ( 5 ), and thereafter, a weft yarn end portion ( 2   b ) is discharged to the exterior, said yarn end suction device ( 1 ) characterized in that 
 said suction mouth ( 5 ) is formed, at a portion of the inner circumference of an end portion of a suction port ( 7 ), with a recessed portion ( 8   b ) that is recessed outward from the center of an opening, and said recessed portion ( 8   b ) is disposed so as to be directed toward the weaving end side.    
     
     
         3 . The yarn end suction device of a loom according to  claim 1  or  2 , wherein a guide ( 6 ) having a control surface ( 14 ) extending in a beating direction for regulating the weft yarn ( 2   a ) carried by the beating motion is disposed between the weaving end and the cutter ( 4 ), and said suction mouth ( 5 ) is disposed in a position where the weft yarn ( 2   a ) having passed through the control surface ( 14 ) by the beating is bent, and sucked and captured.  
     
     
         4 . The yarn end suction device of a loom according to  claim 1  or  2 , wherein said guide ( 6 ) is formed with a slit ( 14 ) that is opened in three directions including a front side confronting a reed ( 3 ), a warp side, and a side of the cutter ( 4 ) for cutting the weft yarn ( 2   a ) to thereby receive the beaten weft yarn ( 2   a ), and said control surface ( 14 ) is formed by said slit ( 14 ).