18 the opposite end of this arm 18 is fixedly attached to a cross shaft 19 fig1 and through the connecting rod 17 the rotary movement of the main shaft 16 causes oscillating movement of said cross shaft the cross shaft 19 also includes an arm 20 fixed thereto which extends generally downward and with the lower end thereof being pivotally connected by means of a pin 21 to that end of the driving rod 13 opposite its connection to the support 8 through arm 20 the oscillating movement of cross shaft 19 causes reciprocating movement of the driving rod 13 and pivotable movement of the support 8 to effect to and fro travel of the looper 7 in a rectilinear pathway 22 during operation the needle 1 is caused to be alternately displaced in two senses along a vertical pathway 9 by a conventional drive means not shown but which is operatively connected with the drive mechanism 14 for effecting actuation of the looper 7 the looper 7 is also alternately displaced in two senses along the rectilinear pathway 22 fig2 which extends generally perpendicular to the needle pathway 9 that is represented by a sign in this figure of drawing the leading end or tip of the looper is identified by numeral 23 and the stitching cycle commences with said looper moving from left to right as viewed in fig3 so that it passes in close proximity with the needle 1 during this initial movement the tip 23 enters.