SINGER 251 - Manual (Page 24)

24
TO TIME THE FEED
Before the machine leaves the factory, the feed
lifting eccentric-and-bevel-gear and the feed eccentric
are both set for average sewing conditions; having the
timing screw in each eccentric enter groove provided
for it in the arm shaft.
As the grooves in the arm shaft are not visible to
the adjuster, the machine pulley should be turned over
toward operator until feed lifting eccentric connecting
rod A2, Fig. 41 is at its lowest position. Timing screw Y,
Fig. 41 will then be on top of feed lifting eccentric-and-
bevel-gear. Loosen timing screw Y and set screw O
and, while maintaining this position of the gear, turn
arm shaft until timing screw, as it is slowly tightened,
can be felt to drop into its groove in arm shaft. Se­
curely tighten timing screw Y and set screw O.
Feed eccentric should be set for average sewing
conditions, by having this timing screw Z exactly in
line with timing screw Y, as shown in Fig. 41. Thus,
as timing screw Z is tightened it will drop into its
groove in arm shaft which is in line with groove pro­
vided for feed lifting eccentric-and-bevel-gear timing
screw Y. Securely tighten timing screw Z and the two
set screws in feed eccentric.
If for any reason, it is necessary to alter the timing
of either eccentric, timing screw should be removed
and eccentric locked in desired setting by means of
set screws only.
Feed eccentric timing screw Z, Fig. 41 appears im­
mediately after large stop screw W, Fig. 41, when
feed eccentric is rotated over toward operator.
NOTE: Whenever the timing of the feed is changed,
sewing hook should be checked for necessary adjust­
ment also, as instructed on page 21.