a needle 34 which cooperates with a loop taker 36 in the bed of the machine a presser foot 38 affixed to a presser bar 40 is utilized to urge fabric into contact with feeding mechanism not shown the needle bar 22 extends through an elliptical opening 42 in arm 18 of fixed bracket 14 which opening is of sufficient size to permit zig zag movements of the needle bar in response to reciprocatory actuation of the needle bar supporting bracket 20 by needle bight control means causing the bracket to pivot at its upper end on a shaft 44 the needle bight control means is entirely conventional and therefor has not been illustrated except for an actuating link 46 shown pivotally connected to bracket 20 at 48 and a return spring 45 having one end restrained by a screw 47 at a fixed location in the machine and having the other end in engagement with an abutment 49 on bracket 20 needle bar 22 is supported between the lower end of bracket 20 and arm 18 of fixed bracket 14 in the sleeve 50 of a spherical bearing 51 see fig3 such bearing includes a collar 52 with a spherical inner surface 54 and a rim 56 on the sleeve 50 with a spherical outer surface 58 in engagement with spherical surface 54 of the collar a spring 59 between the lower end of bracket 20 and sleeve 50 maintains the spherical surfaces 54 and 58 in enforced engagement collar 52 is pivoted on a pin 60 which is an integral part of a member 62 that is affixed in arm 18 of bracket 14 the needle bar supporting bracket 20 includes an enlarged upper end portion 64 having a through hole 65 on.