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SEWING MACHINE DIV. 20 MODEL 385.19001890
MECHANICAL ADJUSTMENT
TENSION RELEASEMECHANISM
TO CHECK:
I. WHEN THE PRESSER BAR ISRAISED,THE TENSION DISC HOLDER (D)SHOULD MOVE ABOUT
1.0MM AS A STANDARD VALUE IN ORDER FOR THE TENSION RELEASE FUNCTION TO
WORK CORRECTLY.
ADJUSTMENT PROCEDURE:
I. REMOVE THE TOP COVER UNIT(SEEP.19)AND BELTCOVER UNIT(SEE P.20).
2. LOOSEN THE SCREWS WHICH HOLD THE FRONT COVER UNIT(E)(SEEP.24).MOVE THE
FRONT COVER UNIT(E)A LITTLE.
3. LOWER THE PRESSER BAR LIFTERAND SETTHE THREAD TENSION DIAL AT "9".LOOSEN THE
SCREW (A).
4. SETTHE CLEARANCE BETWEEN THE THREAD TENSION RELEASING ROD (13)AND THE SPRING
HOLDER(C) BETWEEN 0.3_).5MM AND TIGHTEN SCREW(A).
5. SET THE THREAD TENSION DIAL AT "9"AND RAISE THE PRESSER BAR. MAKE SURE THE
TENSION DISC MOVES ABOUT 1.0MM.
DO THE SAME TESTWITH THE THREAD TENSION DIAL SETAT "0".
6. ATTACH THE TOP COVER, BELTCOVER AND FRONT COVER.
FRONT COVER UNIT (E)
TENSION RELEASING ROD (B)
SCREW (A)
3..
rt
TENSION RELEASING ROD (B)
(CLEARANCE: 0.3 - 0.5 MM)
ING HOLDER (C)
TENSION DISC HOLDER (D)
1.0 MM
36
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