SINGER UT-1 - Manual (Page 10)

WHEN MOVABLE KNIFE KEEP MOVING TO
THE LEFT TILL 1.5mm AWAY FROM THE
RIGHT SIDE OF FEED DOG*S LEFT COLUMN.
THE TIP OF THE MOVABLE KNIFE SHOULD
STILL STAY WITHIN THE RIDGE OF THE LOOPER.
WHEN ADJUSTING. LOOSENING THE SET SCREW (A)
AND TURNING THE ECCENTRIC STUD AND SETTING
THE POSITION OF THE TIP OF MOVABLE KNIFE
(THE SET MARK OF THE ECCENTRIC STUD MUST
FACING TOWARD THE RIGHT SIDE).
2-4 DOUBLE-CHECKING
AFTER ASSEMBLED THE THREAD TRIMMING SET, PRIOR TO THE
SEWING OPERATION. YOU MUST DOUBLE CHECK THE CORRELATION OF
NEEDLE THREAD, LOOPER THREAD, LOWER MOVABLE KNIFE AND
LOOPER. AND ALSO DOUBLE CHECK IF THE THREAD TRIMMER CAN
TRIM THE THREADS PROPERLY AND IF CLAMP SPRING CAN HOLD THE
LOOPER THREAD PROPERLY.
WHEN MOVABLE KNIFE (A) MOVE FROM
RIGHT TO THE LEFT. IT MUST PASSING
THROUGH THE LOOP OF THE NEEDLE
THREADS (U) (LT). IN THE SAME TIME,
THE POSITION OF HOOK BLAD (a^ MUST
BE IN THE FRONT OF LOOPER THREAD.
WHEN MOVABLE KNIFE (A) RETREAT FROM
ITS LEFTEST DEAD POINT TO THE RIGHT.
HOOK BLADE(a;AND(a’)WILL PULL THE
NEEDLE THREAD AND LOOPER THREAD TO
THE FIXED KNIFE AND. CUT THE THREADS
IN ORDER AND THE CLAMP SPRING WALL
HOLD THE THREAD END AND MOVE TO THE
BACK OF LOOPER TOGETHER WITH TRIMMING
KNIFE SET (A). YOU CAN ADJUST THE HOLDING
PRESSURE OF CLAMP SPRING TO AVOID THE
THREAD END CAME OFF DURING THE
MOVEMENT BY ADJUST CLAMP SPRING
PRESSURE ADJUSTING PIECE.