The machine of some breed stretchs tight of needle and machine needle cooperate an opportunity to be able to be adjusted. Connect 3 needles of eaves F007 for example 5 lines stretch tight seam machine is OK stretch tight through adjusting needle cam (F00710004) is opposite at the section before upper shaft (the angle of F00708001) will achieve adjust stretch tight the cooperates an opportunity purpose of needle and machine needle. First-rate cooperates an opportunity is after dropping when machine needle, right opportunity needle is entered stretch tight the needle stretchs tight to just begin to move right when needlework annulus.

Stretch tight the needle swings extent must ensure: Should stretch tight when the needle swings to be returned to towards the left of position of the rightest maximum, can tick off stretch tight needlework, should stretch tight the needle swings most stretch tight when left pinpoint it is 4.5-5.5mm to the distance of left needle.

Stretch tight the installation of the needle should rely on to go up as far as possible highly, but stretch tight mix above the needle stretch tight the needle passes the clearance between should make stretch tight below line board needlework is passed smoothly.

Stretch tight the installation that the needle crosses line board should make stretch tight highly needlework is when machine needle rises to apogee below right opportunity needle slip smoothly at the back of right opportunity needle is pinpoint (be far from handlers a side) when making right opportunity needle drops, do not live easily stretch tight needlework.

Should stretch tight pinpoint swing before left engine needle when, left engine needle and stretch tight pinpoint the clearance between should be 0.5-0.8mm.