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SET SCREW A
– 0.05 – +0.10MM
CLEARANCE SHOULD BE EQUAL
SHUTTLE RACE
SET SCREW B (2 PCS.)
LOWER SHAFT
BUSHING (FRONT)
NEEDLE
SHUTTLE RACE SPRING
MECHANICAL ADJUSTMENT
CLEARANCE BETWEEN NEEDLE AND HOOK (NO.2)
TO CHECK:
USE THIS ADJUSTMENT (NO.2) WHEN ADJUSTMENT NO.1 CAN NOT BE USED.
THE CLEARANCE BETWEEN THE NEEDLE AND THE SHUTTLE HOOK SHOULD BE
BETWEEN – 0.05 – +0.10mm.
ADJUSTMENT PROCEDURE:
1.
SET THE PATTERN SELECTOR DIAL AT “ ”. WIDTH SELECTOR DIAL “ 5 ”.
(STITCH LENGTH DIAL AT ANY POSITION.)
2.
REMOVE THE REAR COVER. (SEE PAGE 11.)
3.
LOOSEN THE SCREW (A) ON THE LOWER SHAFT BUSHING, AND SHIFT THE LOWER
SHAFT ABOUT 0.5MM TO THE RIGHT TO DISENGAGE THE GEARS.
4.
LOWER THE NEEDLE, AND LOOSEN THE TWO SHUTTLE RACE SET SCREWS (B).
PUSH OR PULL THE SHUTTLE RACE UNIT AXIALLY, TO ADJUST THE CLEARANCE
BETWEEN THE NEEDLE AND THE SHUTTLE HOOK IN THE RANGE OF – 0.05 –
+0.10MM.
5.
SET THE PATTERN SELECT DIAL AT “ ”, TURN THE HANDWHEEL TO CHECK
IF THE CLEARANCE BETWEEN THE NEEDLE, AND THE INNER EDGES OF THE
SHUTTLE RACE SPRING AT THE LEFT AND RIGHT NEEDLE DROPS, ARE EQUAL.
IF NOT, MAKE AN ADJUSTMENT BY TURNING THE SHUTTLE RACE UNIT.
6.
TIGHTEN THE TWO SHUTTLE RACE SET SCREWS (B).
7.
SHIFT THE LOWER SHAFT TO THE LEFT TO GET THE GEARS BACK TO THE
ORIGINAL POSITION WHILE ADJUSTING THE BACKLASH.
8.
TIGHTEN THE SCREW (A) FIRMLY.
9.
ATTACH THE REAR COVER.
NOTE: THE BACKLASH SHOULD BE LESS THAN 0.3MM AND THE LOWER SHAFT
CAN TURN SMOOTHLY.
AFTER THE ADJUSTMENT, CHECK THE HOOK TIMING.
