MECHANICAL ADJUSTMENT
CLEARANCE BETWEEN NEEDLE AND HOOK (NO.2)
CORRECT SETTING
USE THIS ADJUSTMENT NO.2 WHEN ADJUSTMENT NO. 1 CAN NOT BE USED.
THE CLEARANCE BETWEEN NEEDLE AND SHUTTLE RACE SHOULD BE 0 mm - 0.15 mm.
TO ADJUST
1.
SET THE PATTERN SELECTOR DIAL AT “B”. (STITCH LENGTH DIAL AT ANY POSITION.)
NOTE:
FOR MODEL JF1004 ... SET THE PATTERN SELECTOR DIAL AT “ “.
FOR MODEL JF1022 AND JF1018, SET THE PATTERN SELECTOR DIAL AT “A”.
SET THE WIDTH SELECTOR DIAL AT “ 0 “.
2.
LOOSEN THE SCREW A ON LOWER SHAFT BUSHING AND SLIDE THE GEAR ABOUT
0.5 mm TO THE RIGHT TO MAKE A SLACK BETWEEN GEARS.
3.
LOWER THE NEEDLE AND LOOSEN THE TWO SHUTTLE RACE SET SCREWS B.
MOVE THE SHUTTLE RACE UNIT AXIALLY EITHER FORWARD OR BACKWARD TO ADJUST
THE CLEARANCE BETWEEN THE NEEDLE AND THE SHUTTLE RACE IN THE RANGE OF
0 mm - 0.15 mm.
4.
SET THE PATTERN SELECTOR DIAL AT “C”, TURN THE BALANCE WHEEL TO CHECK IF
THE CLEARANCE BETWEEN THE NEEDLE AND 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.
NOTE:
FOR MODEL JF1004 ... SET THE PATTERN SELECTOR DIAL AT “ “.
FOR MODEL JF1022 AD JF1018 ...
SET THE PATTERN SELECTOR DIAL AT “C”.
SET THE WIDTH SELECTOR DIAL AT “ “.
5.
TIGHTEN THE TWO SHUTTOLE RACE SET SCREW B.
6.
LOOSEN THE SET SCREW ON LOWER SHAFT BUSHING AND SLIDE THE GEAR BACK TO
THE ORIGINAL POSITION WHILE ADJUSTING THE BACKLASH.
7.
TIGHTEN THE SCREWS A FIRMLY.
8.
ATTACH THE RACE COVER.
NOTE:
THE BACKLASH PLAY SHOULD BE LESS THAN 0.3 mm AND LOWER SHAFT TURNS
SMOOTLY.
AFTER THE ADJUSTMENT, CHECK THE HOOK TIMING.
SET SCREW A
LOWER SHAFT
BUSHING (FRONT)
SHUTTLE RACE SET
SCREW B (2 PCS.)
0 mm - 0.15 mm
CLEARANCE
SHOULD BE EQUAL
NEEDLE
SHUTTLE RACE SPRING
14
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