8
MECHANICAL ADJUSTMENT
BOBBIN TENSION
TO CHECK:
SET THE BOBBIN IN THE BOBBIN CASE AND PASS THE THREAD (COTTON #50) THROUGH
THE TENSION SPRING.
THE BOBBIN THREAD TENSION SHOULD BE 45–55g WHEN PULLING THE THREAD IN THE
DIRECTION OF (A).
IF THE TENSION IS OUT OF THIS RANGE, ADJUST IT AS FOLLOWS:
ADJUSTMENT PROCEDURE:
1. IF THE BOBBIN THREAD TENSION IS TOO TIGHT, TURN THE ADJUSTING SCREW (B)
IN THE DIRECTION OF (C).
2. IF THE BOBBIN THREAD TENSION IS TOO LOOSE, TURN THE ADJUSTING SCREW (B)
IN THE DIRECTION OF (D)
(A)
(B)
(C)
(D)
COTTON THREAD #50
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