SINGER UT-1 - Manual (Page 8)

THE RELATIONSHIP AMONG CLAMP SPRING.
KNIFE PRESSURE SPRING AND CLAMP
SPRING PRESSURE ADJUSTING PIECE.
WHEN THE HOOK BUDE OF MOVABLE
KNIFE A RETREATED 1mm INSIDE FROM
THE BALDE OF FIXED KNIFE B, THE
FRONT EDGE OF CLAMP SPRING C
SHOULD MATCH EVEN WITH THE TOP
OF MOVABLE KNIFE. SIDE EDGE
OF MOVABLE KNIFE AND CLAMP SPRING
ALSO SHOULD MATCH EVENLY.
WHEN LOOPER THREAD BEEN CUT.
THE CLAMP SPRING SHOULD HOLD
THE LOOPER THREAD AND MOVING
AWAY TOGETHER WITH KNIFE BASE
FROM THE LOOPER AND THE PRESSURE
OF CLAMP SPRING CAN BE ADJUSTED
BY ADJUSTING THE CLAMP SPRING
PRESSURE ADJUSTING PIECE AND PLEASE
REFER TO NEXT ITEM.
FIXED KNIFE®
jm
PRESSURE SPRING f 3
PRESSURE SPRING pippp
2-2 SETTING THE HEIGHT OF THE LOWER FIXED KNIFE
CARRIER GUIDE
WHEN LOWER MOVABLE KNIFE MOVE
FORWARD FROM LOWER KNIFE HOLDER,
THE INTERNAL BETWEEN MOVABLE KNIFE
AND THE RIDGE OF LOOPER SHOULD
BE 0.1
LOOSENING THE SET SCREW A AND ADJUSTING
THE HEIGHT OF LOWER FIXED KNIFE CARRIER
GUIDE TO ITS PROPER POSITION THEN TIGHTEN
THE SET SCREW A.
PLEASE MAKE SURE THE LOWER MOVABLE
KNIFE CAN BE MOVH) FORWARD AND
BACKWARD SMOOTHLY.