SINGER 331K4 - Manual (Page 12)

12
SPECIFICATIONS
The following gauge distances should be of help to
adjusters of these machines:
• Height of presser foot above throat plate 5/16
inch.
• Distance from throat plate seat to needle stop in
needle bar (needle bar at lowest point), 1.004 inches.
• Needle bar stroke 1.472 inches
• Rise of needle bar when point of shuttle is at
center of needle (loop lift), .100 inch.
VARIATIONS: Certain conditions of sewing may
necessitate slight variations from thèse settings.
TO SET THE PRESSER BAR
AT THE CORRECT HEIGHT
PREPARATION:
Remove face plate and slide plate.
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 5/16 inch clearance between
presser foot and throat plate.
2. When presser foot rests firmly upon throat plate
(with feed dog below throat plate) there should still be
some clearance between guide bracket A, Fig. 28 and
lifting bracket B, as shown in Fig. 28.
3. When presser foot is at its highest point and needle
bar is at its lowest, top of presser foot should clear the
needle thread eyelet C, Fig. 28 at the lower end of
needle bar.
SETTING:
• Release the presser bar lifting lever D, Fig. 28,
lowering the presser foot.
• Loosen clamping screw E, Fig. 28.
• Raise or lower guide bracket A, as required.
• Make certain presser bar is positioned correctly
so that needle will locate centrally between the two
toes of the presser foot.
Fig. 28. Checking Height of Presser Bar
• Securely tighten screw E.
Whenever guide bracket A, Fig. 28 has been
moved on presser bar, check the setting of check
spring as instructed on page 14.