Singer 451k45 - TO ADJUST THE NEEDLE THREAD TENSION RELEASER; TO SET PRESSER BAR AT THE CORRECT HEIGHT

Fig. 46. Adjustment for
Needle Thread Tension Releaser
PRESSER 4
FOOT •
RESTING 1
FIRMLY T
ON
THROAT
PLATE
Fig. 47.' Checking Height o?
Presser Bar
TO ADJUST THE NEEDLE THREAD
TENSION RELEASER
Tension releaser J2, Fig. 46 automatically releases
spring pressure on tension discs when presser bar
is raised.
To adjust, loosen screw K2, Fig. 46.
To release tension earlier, raise releaser J2.
To release tension later, lower releaser J2.
When correct setting is obtained, securely tighten
screw K2.
VARIATION
To prevent premature release of tension, when stitch
ing heavy material, releaser J2 should be set lower
than when stitching light work.
TO SET PRESSER BAR
AT THE CORRECT HEIGHT
PREPARATION
Remove foctf plate, as instructed on page 16.
Remove slide plate.
Test presser bar for smooth, uniform motion. If
presser bar tends to stick at any point, feeding will
be adversely affected. Presser bar may need cleaning, .
repairing or replacement.
Accumulation of lint, oil and dirt on presser foot
seat on presser bar may prevent proper seating of
foot. Clean this area before checking and setting the
presser bar.
CHECK
1. When presser foot is raised with presser bar
lifting lever there should be a clearance between
presser foot and throat plate:
•
9/32 inch for Machines 451K4I and 451K45
• 5/16 inch for Machine 451K145
2. When presser foot rests firmly upon throat plate
(with feed, dog below throat plate) there should
still be some clearance between presser^bar po
sition guide C2, Fig. 47 and lifting bracket W2,
as shown in Fig. 47.
3. When presser foot is at its highest point and
needle bar is of its lowest, top of presser foot
should clear the lower end of needle bar M2,
Fig. 47.
SETTING
• Release presser bar lifting lever, lowering presser
foot.
• Loosen clamping screw D2, Fig. 47.
• Raise or lower
guide C2, Fig. 47 as required.
• Make certain presser bar is turned correctly so
that needle will locate centrally between the two toes
of the presser foot.
• Securely tighten screw D2.
Review setting of check spring, as instructed on
pages 15 and 16.
OTHER ADJUSTMENTS
• Presser bar bushing U2, Fig. 47, should be set
so that its top is even with top of lifting bracket
W2, Fig. 47 when bracket is all the way down.
• Presser foot should offer as little resistance as
possible to material. Check bottom surface of foot for
wear or abrasion; particularly at angle that toe makes
with sole of presser foot.
17
From the library of: Superior Sewing Machine & Supply LLC