SINGER 331K4 - Manual (Page 5)

THREAD
On Machines of Class 331K, use only left twist
thread in the needle. Either right or left twist thread
can be used in the bobbin.
To determine the thread twist, hold the thread as
shown in Fig. 6. Then twirl the thread over toward you.
If the strands of the thread wind tighter, the thread is
left twist, if the strands unwind or separate, the thread
is right twist. Rough or uneven thread, or thread which
passes with difficulty through the eye of the needle,
will interfere with the successful use of the machine.
Fig. 6. How to Determine the Twist
NEEDLES
The needle you select will have a very direct effect
on the quality, strength and appearance of the stitch
produced by the machine.
In selecting a needle size . . . the eye must be large
enough to allow the thread you are using to pass
through freely without binding or chafing. A simple
test is to thread a short length of thread through the
eye of the needle selected; hold the thread taut in a
vertical position and twirl the needle about the thread.
If the size is correct, the needle should slip down the
thread easily.
Needles for this machine are of Catalog #2055
(16 X 87) in Sizes 8 to 14, 16 to 19 and 21 to 25.
Orders for needles must specify the Quantity
required, the Size number, also the Catalog number.
For example:
‘nOO Size 16, Catalog #2055
(16x87) Needles’’
For best results always use SINGER needles.
LONG
GROOVE It
MOVE TO
HIGHEST POINT
N
LOOSEN SCREW
INSERT NEEDLE UP
AS FAR AS POSSIBLE
AND TIGHTEN SCREW
Fig. 7. Setting the Needle
TO SET THE NEEDLE
Turn the machine pulley over toward you until the
needle bar moves to its highest point.
After loosening needle clamping screw, remove old
needle and insert new needle UP into needle bar AS
FAR AS IT WILL GO, as instructed in Fig. 7.
The single continuous groove of the needle MUST
face away from the shuttle point (toward the left end
of the machine, as shown in Fig. 7) with eye of needle
directly in line with arm of machine.
COMMON CAUSES OF STITCHING TROUBLES
Check needles often to make sure these defects are
not present...
^ Wrong needle for thread and material in use.
• Bent needle, clogged needle eye, or dirty
needle grooves may cause skipped stitches.
• Hook or burr on needle point may cause picking
or fraying of the material.
Securely tighten needle clamping screw. • Incorrect setting of needle.