Singer 271K - Clamp-Check Clearance with Needle

NEEDLE
SLOT
CLAMP CHECK
LEFT-HAND
SOCKET SCREW^
RIGHT-HAND
SOCKET SCREW
HAND
RATCHET
LEVER
^ 'I
CLAMP
ARM j.
.015" MINIMUM
e CLEARANCE
Fig. 70. Clamp Check Clearance
ADJUSTING
SCREWS
1/16" TILT
CLAMP-CHECK
Fig. 71. Clamp Check Tilt Adjustment
CLAMP-CHECK
CLEARANCE WITH NEEDLE
To avoid thread fraying, ciamp-check should
never overlap needle slot in needle plate. At
"stop" position, there should be a minimum of
.015 inch clearance between front of needle and
inside edge of clamp check.
To adjust, first check "Needle and Knife
Alignment", as instructed on page 16, and
"Needle Plate Centered (Front to Rear)" as
instructed on page 26.
Then
1. Ratchet machine to bring clamp arm
forward for access to clamp arm socket
screws.
2. Loosen only the right-hand socket
screw shown in Fig. 70.
3. Ratchet machine bock to
"stop" posi
tion.
4. Loosen the left-hand socket screw.
5. Bring needle to lowest position and
move clamp-check as required to obtain
.015 inch minimum clearance in front
of needle as shown in Fig. 70. Use
more
clearance if such is necessary to
avoid overlapping needle slot.
6. Tighten left-hand socket screw secure-
ly.
7. Ratchet clamp arm forward and tighten
right-hand socket screw securely.
SWING OF CLAMP-CHECK
(Machines 271K1 and271K2Q1 only)
Raise clamp arm very slowly, observing
tilting swing at front and rear of clamp-check,
shown in Fig. 71.
Clamp-check should tilt at front and rear,
approximately 1/16 inch. This tilt may vary for
different materials.
To adjust the tilt, loosen or tighten the two
screws shown in Fig. 71 on top of the clamp-
check holder, as required.
27
From the library of: Superior Sewing Machine & Supply LLC