Brother International EF4-B561 Service Manual - Page 33

3. DOUBLE-NEEDLE, FOUR THREADS No. 1 Double needle four threads 2 Cloth Knit unddewrweeaarr material Thin knitwork 3 Bulky material Thread Cotton #60/2 Synthetic #60 Needle: Synthetic #60 Looper: Woolen Mock safety 4 Broadcloth 5 Jersey Cotton #80 Polyester #50 Needle size Differential ratio Stitch length # 9 1 --1.5 2 - 2.5 #11 # 14 1-- 2 2 .s. 3 PI 2.2 --2.8 #11 0.8 ^-1 #14 1.5 -- 2 2 -2.5 2.5 - 3 No. Left needle Right needle Over looper Under looper thread tension thread tension thread tension thread tension 1 Double-needle four threads 2 3 60 ^- 80 40 -.60 70^90 30 -- 50 25 ,*- 45 35^55 6 -- 18 4 ~16 3 ., 10 8 ^- 20 6 .- 18 5 ..- 15 4 Mock safety 5 50 -- 80 50 -70 45 -- 70 25 ~50 8 -- 15 10 .- 20 8^-15 8-18 Note on Item 1: Cotton threads in the range of #60/2 to #70/2 are weak so that the thread tension must be reduced as much as possible. A poor quality thread tends to break. In that case, do not tighten the needle thread tension but adjust the positions of the thread take-up and thread guide if the thread tension must be increased. Note on Item 2: About the same tension may be used for sewing with synthetic and cotton threads. Note on Item 3: Make the same adjustment as mentioned in Item 5 for three threads. Note on Item 4: If the over looper thread tension is too small, double-needle four-thread stitches may sometimes be made. In such a case, raise the over looper thread take-up (R) to decrease thread delivery. Note on Item 5: When sewing jersey with chemical thread, it may break due to heat. A DOUBLE-NEEDLE, FIVE THREADS (Safety Stitches Only) No. Cloth 1 Broad cloth 2 Broad cloth 3 Jersey 4 Gaberdine 5 Denim Thread Cotton #80 Polyester #80 Needle: Polyester #50 Looper: Wooly nylon Cotton #50 Cotton #50 Needle size #11 II #14 #16 #21 r Differential ratio 0.8 -.1 ll 1.5 --, 2 1 II No. Double chain stitch Double chain stitch needle thread tension looper thread tension 1 20 "- 50 5 -- 15 2 15^p 45 5-t0 3 25^ 60 8 --, 20 4 35^ 60 , 6 .- 15 5 80 ...- 110 10 .- 20 Over needle thread tension 40.- 90 30- 80 25^- 50 50 -- 100 70 "- 150 Over looper thread tension 10.- 25 8-20 5 --. 15 7 -- 20 10 -- 25 Raise Stitch length 2-- 2.5 II 2.2- 2.8 2.5 -3 II Under looper thread tension 8 - 20 5-1S 8 •", 20 10 -- 30 15 ^30 -31 -