Brother International AIRFLOW 3000 Operation Manual - Page 11

Stitch width The normal stitch width setting for regular overlock stitch is 5 mm (13/64 inch). To change the stitch width, turn the stitch width adjustment dial. $!   1 Increase the width to a maximum of 7.5 mm (19/64 inch). 2 Reduce the stitch width to a minimum of 5 mm (3/16 inch). Selection mark Differential feed IMPORTANT - When sewing thick non-stretchable material such as denim, do not use the differential feed as it may damage the fabric. This serger is equipped with two sets of feed dogs under the presser foot to move the fabric through the machine. The differential feed controls the movement of both the front and the rear feed dogs. When set at 1.0, the feed dogs are moving at the same speed (ratio of 1.0). When the differential feed ratio is set at less than 1.0, the front feed dogs move slower than the rear feed dogs, stretching the fabric as it is sewn. This is effective on lightweight fabric that may pucker. When the differential feed ratio is set at greater than 1.0, the front feed dogs move faster than the rear feed dogs, gathering the fabric as it is sewn. This function assists in removing the rippling when serging stretch fabrics. Differential feed adjustment Differential Main feed ratio feed (rear) 0.7 - 1.0 1.0 Differential Effect Application feed (front) Material is Prevents thin pulled tight. materials from puckering Without Normal differential sewing feed. Differential Main feed ratio feed (rear) 1.0 - 2.0 Differential Effect Application feed (front) Material is Prevents gathered stretch or pushed materials together. from stretching or puckering The normal setting is 1.0 on the defferential feed ratio adjustment dial. To adjust the diffrerential feed, turn the dial on the right bottom of the machine. $!   1 Less than 1.0 2 Greater than 1.0 Selection mark To get smooth finish, adjust the feed ratio from 1.0 toward 2.0. (The feed ratio required depends on the elasticity of the material.) The more elastic the material, the further toward 2.0 the differential feed ratio should be set. Testsew with a scrap of the fabric to find the correct adjustment. Adjusting the presser foot pressure Turn the presser foot pressure adjustment screw on the top left of the machine. You can adjust by referring the value on the screw. The normal setting is "2".   $! 1 Less pressure 2 More pressure Selection mark Adjust the presser foot pressure to prevent the material from puckering or to allow sewing of curves. When sewing on very light materials, the presser foot pressure should be loosened. When sewing very heavy materials, the pressure foot pressure should be tightened. 9 English