Singer class 251 - Sewing Hook Timing; Setting Sewing Hook Sidewise to Needle

From the library of Superior Sewing Machine & Supply LLC - www.supsew.com
22
TO TIME THE SEWING HOOK
The point of the sewing hook should be at the center of the needle,
as shown in Figs. 31 and 32, when lower timing mark on needle bar
reaches the bottom end of needle bar bushing N during the upward
stroke of needle, as shown in Fig. 31.
...
~N
0
tON
LOWER
TIMING
MARK
UPWARD
STROKE
L
Fig. 31. Timing the Sewing Hook
Before checking timing of sewing hook, remove presser foot, feed
dog, slide plate and throat plate.
23
To time the sewing hook turn
machine pulley over toward the
operator until lower timing mark on
needle bar reaches bottom end of
needle bar bushing N, on upward
stroke of needle.
Then loosen two hub set screws
X, Fig. 32, in hub of hook. (The two
screws X can be reached from top
of bed with throat plate off.)
While maintaining position of
needle, as described above, turn
hook on its shaft as required to
bring hook point to center of needle,
as shown in Fig. 32. Make certain
that hub of hook is firmly against
hook shaft oil retaining collar K3,
as shown in Fig. 35, then securely
tighten two set screws X.
HOOK POINT
AT CENTER
OF NEEDLE
\~
Fig. 32. Sewing Hook Correctly Timed
TO SET THE SEWING HOOK SIDEWISE
IN RELATION TO
THE NEEDLE
Sewing hook should never strike needle.
\I D5
j/HOOK POINT
Fig. 33. Clearance Between Hook
Point and Needle
I
'FLAT OF
HOOK POINT
Fig. 34. Checking Clearance Between
Needle and Flat of Hook Point
When point of sewing hook passes needle, clearance between hook
point and needle at DS, Fig. 33 should be approximately equal to
thickness of a piece of note paper (about .005 inch), as shown in Fig. 34.
Not only point of hook but FLAT OF HOOK POINT should clear needle
scarf
until heel of flat has passed the needle.