Singer 601 - Thread Handling and Bobbin Winding; Thread Identification and Selection; Machine Threading Procedure; Threading the Thread Unwinder

TENSION RELEASE AND MOVABLE SLACK THREAD REGULATOR
TENSION RELEASING WIRE
Fig. 54
TRIMMING OPERATION
1. When the foot treadle is returned to its neutral position
upon completion of the sewing cycle, the needle bar
stops approximately 3mm (.118") above the lower
dead point on its upward stroke (Fig. 56, hook point in
the loop of needle thread) when the sensor plate (A)
reaches a point shown in Fig. 57.
2. Heeling the foot treadle will start the machine to run
at the trimming speed (200 r.p.m.).
Fig. 55