THREAD TENSIONS
It is important that tension of upper and lower threads be equal to prevent puckering of material or other problems.
It is recommended that a test sample be made before starting to sew.
UPPER THREAD TENSION
To regulate upper thread tension, merely turn thread tension dial with your thumb after lowering the presser foot.
THE HIGHER THE NUMBER, THE
TIGHTER THE TENSION.
To increase tension: Turn dial to right to larger number.
To decrease tension: Turn dial to left to smaller number.
NOTE:The zigzag stitch requires less upper tension than the straight stitch.
LOWER THREAD TENSION
Although lower thread tension has already been adjusted at the factory, when sewing very thin or heavy materials it may have to be readjusted.
To regulate the lower thread tension, turn small screw on the tension, spring of the bobbin case with the small screw driver.
To increase tension: Turn the small screw
clockwise very slightly.
To decrease tension: Turn the screw counterclockwise very slightly.
