Timing mark on, Lower timing mark lower, Upward stroke – SINGER 251 User Manual
Page 21: I on upward stroke, Hook point at center of needle
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21
TO TIME THE SEWING HOOK
LOWER
TIMING
MARK
LOWER
TIMING
MARK
ON
UPWARD
STROKE
Fig. 34A. Checking the Tinning of the Hook
on Machines with Tinning Marks at
Lower End of Needle Bar
I ON
UPWARD
STROKE
H
'IL
E27559
Fig. 34. Checking the Timing
of the Hook
(Viewed fronn Front)
PREPARATION:
Remove
presser
foot,
slide
plate,
throat
plate
and
feed dog.
Remove
face
plate
on
machines
on
which
timing
marks are on
upper half
of needle bar.
CHECK:
ON MACHINES ON WHICH TIMING MARKS ARE
ON UPPER HALF OF NEEDLE BAR-
When
lower timing mark
on needle bar is level with
lower end of upper needle bar bushing A
as shown
in
Fig. 34,
the point of the sewing hook should be at
the center of the needle, as shown in enlarged view
in
Fig. 35.
HOOK POINT
AT CENTER
OF NEEDLE
Fig. 35. Timing the Hook
(Viewed from Rear)
ON MACHINES ON WHICH TIMING MARKS ARE
ON LOWER HALF OF NEEDLE BAR-
When
lower timing mark
on needle bar is level
with
lower end of lower needle bar bushing K
as
shown in
Fig. 34A,
the point of the sewing hook
should be at the center of the needle, as shown in
Fig. 35.
TIMING:
Loosen two set screws
L, Fig. 35
in hub of hook.
Turn hook on its shaft, as required to bring point of
hook to center of needle, as shown above.
Make certain that hub of hook is against oil-re
taining collar; then securely tighten screws
L.