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14
MECHANICAL ADJUSTMENT
NEEDLE TIMING TO SHUTTLE
TO CHECK:
THE HEIGHT OF THE NEEDLE POINT FROM ITS LOWEST POINT SHOULD BE IN THE
RANGE OF 1.45–1.95 MM WHEN THE TIP OF THE SHUTTLE HOOK MEETS THE LEFT
SIDE OF THE NEEDLE AT THE LEFT NEEDLE POSITION IN ASCENDING TRAVEL.
ADJUSTMENT PROCEDURE:
1.
SET THE PATTERN SELECTOR DIAL AT “ ”.
2.
REMOVE THE BASE (SEE PAGE 2).
3.
OPEN THE SHUTTLE COVER.
4.
REMOVE THE SHUTTLE RACE RING.
5.
TURN THE HSNDWHEEL TOWARD YOU UNTIL THE TIP OF THE SHUTTLE HOOK
MEETS THE LEFT SIDE OF THE NEEDLE.
6.
LOOSEN THE LOWER SHAFT CRANK ARM SCREWS (A).
7.
WHILE HOLDING THE SHUTTLE HOOK SO IT DOESN'T TURN, TURN THE
HANDWHEEL TOWARD YOU UNTIL THE NEEDLE COMES TO ITS LOWEST
POSITION.
THEN, FURTHER TURN THE BALANCEWHEEL TO RAISE THE NEEDLE ABOUT 1.7
MM FROM ITS LOWEST POSITION.
8.
TIGHTEN THE SCREWS (A).
9.
TURN THE BALANCEWHEEL TOWARD YOU TO CHECK IF THE HEIGHT IS IN THE
RANGE OF 1.45-1.95 MM.
IF IT IS NOT IN THIS RANGE, REPEAT THE ABOVE PROCEDURE.
10. ATTACH THE SHUTTLE RACE RING.
11. ATTACH THE BASE.
LOWER SHAFT CRANK ARM
SCREWS (A) (2)
1.45–1.95 MM
LOWEST POSITION
LOWER SHAFT