Sewing machine having a thread finger assembly

Abstract

A thread finger assembly for a sewing machine has at least one thread finger. The latter can be actuated between a loop engagement position and a loop pull-out position. The loop engagement position serves for the engagement of the thread finger in a thread loop generated by the sewing machine in a stitch forming region. The loop pull-out position is displaced relative to the loop engagement position for pulling out the thread loop with the thread finger, away from the stitch forming area. A thread finger drive serves for actuating the thread finger between the loop engagement position and the loop pull-out position. This results in an assembly of a sewing machine with which an appealing seam pattern is generated in a reproducible manner at a seam beginning.

1 . A sewing machine ( 1 ) with a thread finger assembly ( 12 )
 with at least one thread finger ( 14 ,  15 ), which can be actuated between a
 loop engagement position for the engagement of the thread finger ( 14 ,  15 ) in a thread loop generated by the sewing machine ( 1 ) in a stitch forming region and a 
 loop pull-out position, which is displaced away from the stitch forming region relative to the loop engagement position for pulling out the thread loop with the thread finger ( 14 ,  15 ), 
   with a thread finger drive ( 26 ) for actuating the thread finger ( 14 ,  15 ) between the loop engagement position and the loop pull-out position,   wherein in the loop engagement position a fingertip of the at least one thread finger ( 14 ,  15 ) is located between a hook ( 9 ,  10 ) and a stitch plate ( 11   a ) of the sewing machine ( 1 ).   
     
     
         2 . The sewing machine according to  claim 1 , wherein the at least one thread finger ( 14 ,  15 ) has a bent configuration. 
     
     
         3 . The sewing machine according to  claim 1 , wherein the at least one thread finger ( 14 ,  15 ) has a thread catcher hook ( 15   a ) at its free end. 
     
     
         4 . The sewing machine according  claim 1 , comprising two thread fingers ( 14 ,  15 ) which can be assigned to two thread loops of a two-needle sewing machine ( 1 ). 
     
     
         5 . The sewing machine according to  claim 1 , comprising a slotted guide ( 16 ) for guiding a displacement movement of the thread finger ( 14 ,  15 ) between the loop engagement position and the loop pull-out position. 
     
     
         6 . The sewing machine according to  claim 1 , wherein the thread finger drive ( 26 ) is designed as a pneumatic drive. 
     
     
         7 . The sewing machine according to  claim 1 , wherein the thread finger ( 14 ,  15 ) has a thickness in the direction of the distance between the hook ( 9 ,  10 ) and the stitch plate ( 11   a ) of the sewing machine ( 1 ) which is at most 2 mm. 
     
     
         8 . The sewing machine according to  claim 1 , wherein a width of the thread finger ( 14 ,  15 ) transverse to its longitudinal extension is smaller than 5 mm.