SINGER UT-1 - Manual (Page 11)

THE TRIMMING ABIUTY OF KNIFE MUST
BE MODERATE OR THE.KNIFE WILL BE
WORE OLTT VERY SOON. IF THE TENSION
OF KNIFE PRESSURE SPRING IS TOO BIG,
YOU CAN ADJUST IT BY MOVING KNIFE
PRESSURE SPRING TO THE RIGHT OR
LEFT IN ORDER TO GET PROPER TENSION.
DOUBLE CHECK THE POSITION OF SAFETY
SWITCH WHEN THE POWER IS ON. THE
TRIMMING KNIFE SET MUST BE IN ITS SET
POSITION.
THE TRIMMING KNIFE SET CAN ONLY
FUNCTION WHEN THE KNIFE DRIVING
CYLINDER (B) PUSH AWAY SAFETY STITCH (A).
WHEN ADJUSTING. LOOSENING SET SCREW (C)
AND SETTING THE DESIRED POSITION FOR
SAFETY SWITCH THEN TIGHTEN SET SCREW(C).
AFTER TIGHTEN THE SET SCREW (C) YOU
MUST DOUBLE CHECK IF SAFETY SWITCH IS
SET PROPERLY.
3. TENSION RELEASE EQUIPMENT
EACH OF SET SCREWS FOR THE TOP
THREE THREAD GUIDE HOOK UNITS IS
SETTING IN THE MIDDLE OF TWO THREAD
GUIDE EYELETS AND EACH OF SET
SCREWS FOR THE BOTTOM TWO THREAD
GUIDE HOOK UNITS IS SETTING IN THE
DISTANCE OF lOm.m. APART FROM THE
THREAD GUIDE EYELET.
THE RELEASE WEDGE MUST REACT
EARLIER THAN THE THREAD TRIMMER'S
OPERATION. WHEN ADJUSTING, LOOSENING
THE SET SCREW. SETTING THE PROPER
POSITION OF RELEASE WEDGE. IN THE
MEANTIME. PLEASE MAKE SURE THE
RELEASE WEDGE CAN PUSH TENSION
DISC COMPLETE APART AND ALSO CAN
RETREAT COMPELELY ( CAN NOT
INTERFERENCE WITH TENSION DISC.)