Singer XL-420 FUTURA Instruction Manual - Page 24
Changing Presser Foot, Adjusting Top Thread Tension
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ADJUSTING TOP THREAD TENSION 90% of your sewing will be accomplished with the word "S" exposed on the tension control dial on top of the machine. Helpful Hint: A slight adjustment to a higher number or a lower number may improve sewing appearance. STRAIGHT STITCHING The correct appearance of your stitching is largely determined by the balanced tension of both top and bobbin threads. The WHQVLRQ LV ZHOO EDODQFHG ZKHQ WKHVH WZR WKUHDGV µORFN¶ LQ WKH middle of layers of the fabric you are sewing. ,IZKHQ\RXVWDUWWRVHZ\RX¿QGWKDWWKHVWLWFKLQJLVLUUHJXODU you will need to adjust the tension control. Do this, however, only after you have determined that the machine is correctly threaded (see page 7). 0DNHDOODGMXVWPHQWVZLWKSUHVVHUIRRWµGRZQ¶ A balanced tension (identical stitches both top and bottom) is usually only desirable for straight stitch sewing. Under side Côté de dessous Reverso Well balanced Correct Bien equilibrada Top side Côté de dessus Cara Top stitch too tight Fil supérieur trop tendu Puntada superior demasiado apretada Top stitch too loose Fil supérieur trop lâche Puntada superior GHPDVLDGRÀRMD ZIGZAG, SATIN STITCH, DECORATIVE and BUTTON HOLE SEWING For zigzag sewing, satin stitch and decorative stitch functions, thread tension should be less than that for straight stitch sewing. It is recommended for buttonholes to set thread tension at E.