Singer 601 - Sewing Operation and Adjustments; Preparation and Basic Sewing; Adjusting Stitch Length; Adjusting Presser Foot Pressure

X As the needle thread is cast off the rotating hook, it
catches on the hook portion of the thread puller.
(Fig. 62)
6. T he tension release action plate pin reaches the inclina¬
tion on the tension release action cam and start releas¬
ing the tension discs immediately after the needle
thread catches on the thread puller.
7. W hile the above takes place, the cam follower on the thread puller action plate reaches the inclination on thread
puller action cam and the thread puller begins to pull the bobbin and needle threads toward the stationary
knife.
8. The bobbin and needle threads are severed when the
cutting edge of the thread puller closes in against the
cutting edge of the stationary knife. (Figs. 63 and 64)
9. When the threads are trimmed, the spring biased
tension release action plate moves back to its rest
position disengaging its pin from the tension release
action cam and thus complete its function of releasing
and holding the needle thread tension released.
CUTTING EDGE OF
THREAD PULLER
Fig 63
10. The trimmer and tension releasing mechanisms return
to their rest positions upon completion of the
trimming operation and the machine stops in the upper
needle position when the sensor plate <D'. reaches a
point shown in Fig. 65.
11. Upon completion of the trimming operation, the
thread wiper makes a swivelling movement to place
the needle thread in proper position for starting the
next sewing operation.