Singer 281-5 - Timing the Machine; Timing the Sewing Hook; Setting the Clearance between Needle and Hook Point

CLEARANCE
ABOVE EYE
'LOWER TIMING
MARK LEVEL
WITH BOTTOM
OF LOWER
NEEDLE BAR
BUSHING
HOOK POINT AT
CENTER OF
NEEDLE
Fig. 44. Hook Point at Center of Needle
HOOK
BODY «=
SCREWS
OIL
'retaining
COLLAR
Fig. 45. Hook Body Screws
NOTE-PAPER
FLAT OF
HOOK POINT
Fig. 46, Clearance Between Needle and Hook
TIMING THE MACHINE
Timing the machine consists of first adjusting the
rodiol position of sewing hook with relation to move
ment of needle bar and needle thread take-up lever, to
moke
certain that loop of thread formed by needle will
be correctly taken by point of hook at proper time.
The check spring and feed are then timed to syn
chronize their motions with needle and hook movement.
TIMING THE SEWING HOOK
MACHINE 281-5: Remove bed-raising plate.
MACHINES 281-22 AND 281-24: Make certain that
timing-indicator pin is correctly set in needle bar
frame, as instructed on page 17.
ALL MACHINES: Remove
slide plate, throat plate,
presser foot and feed dog.
Turn machine pulley over toward operator until
needle bar reaches its lowest point and rises to posi
tion where LOWER TIMING MARK on needle bar is
level with bottom of lower needle bar bushing, as
shown in Fig. 44. (On Machines 281-22 and 281-24,
LOWER TIMING MARK should be level with timing-
indicator pin shown in Fig. 42, page 17).
At this position, point of sewing hook should be at
center of needle, as shown in inset. Fig. 44.
Loosen two hook body screws shown and turn hook
on shaft
as required to bring point of hook to center of
needle. See Fig. 45.
Make
certain that hub of hook is against oil re
taining
collar and tighten hook body screws.
Check
clearance between needle and hook point,
in accordance with the following instructions.
SETTING THE CLEARANCE BETWEEN
NEEDLE AND HOOK POINT
MACHINE281-5: Remove bed-raising plate.
ALL MACHINES: Remove si ide plate, throat plate and
bobbin case.
Check to see that needle is properly seated in
needle bar and time sewing hook as previously in
structed.
Point of sewing hook should pass needle as closely
OS possible without striking or deflecting needle.
A clearance of about the thickness of a piece of note
paper (approximately .005 inch), as shown in Fig. 46,
is sufficient.
From the library of: Superior Sewing Machine & Supply LLC