Brother International EF4-B561 Service Manual - Page 30

CD Differential ratio 6 5 4 4 3 3 In case of sherring Set the scale on differential feed arm fill to a larger number than that of the scale on main feed arm 0. _J * Even in case you adjust stitch length by changing the movement of main feed arm 0, make sure to remain differential ratio unchanged as before without fail. Note: If the main feed arm 0 and differential feed arm 43) are set to any scale value greater than those shown at right, the feed dogs will hit the edges of the slots in needle plate. Feed arm Specificstions Normal stitching Denim Ruffler Bulky Main feed arm Differential feed arm 3.6mm 3.3mm 2.5mm 6.5mm 9.0mm 9.0mm 7. SEWING INSTRUCTION SINGLE-NEELDE, TWO-THREAD * Thread tension means the tension of the thread pulled in the running direction after the tension disc. No. Cloth 1 Wool, polyester, thin trouser fabrics Wool, polyester, 2 medium-thick trouser fabrics 3 Knit fabrics, jersey Thread Needle size Cotton #60/2 #11 Differential ratio 1 Stitch length Needle thread Looper thread tension tension 3 - 3.6 18 - 28 8 - 18 n n Wooly nylon 1 --. 1.5 2 - 3 10 --' 20 15 - 25 Note on Item 1: Edges tend to curl when sewing thin materials. So decrease the hemming width (to about 3 to 4mm) and reduce the thread tensions to such an extent that the stitches will not be out of shape. Better stitches can be obtained by increasing the over looper tension a little above the normal level. Looper thread Needle thread Note on Item 2: Edges will not curl when se ng medium materials. Hemming width may be increased up to 6mm, and stitch length up to 3.6mm. Note on Item 3: It wooly nylon thread is used for both the needle and the loopers, or only for the loopers, cloth edges neatly. The smaller the stitch length the better will be the finished stitches. ( Needle thread: Synthetic thread Looper thread: Wooly nylon thread ( Needle thread: Wooly nylon thread Looper thread: Wooly nylon thread - 28 -