needle, the machine will not function prop-
erly.
Needles used on rotary sewing machines are
ordered the same way as those for oscillating
sewing machines.
The needles for rotary sewing machines have
seven parts. This is one more part other than the
needles for the oscillating machines. The
additional part is the SCARF, which is a small
indention just above the short thread groove. The
purpose of the scarf is to permit the point of the
sewing hook to come close enough to pick up the
needle thread without striking the needle.
Operation
Operation of rotary sewing machines is the
same as for the oscillating sewing machines.
Setting the Needle
Turn the balance wheel toward you until the
needle bar moves up to its highest position.
Loosen the setscrew in the needle bar and slip the
needle up into the bar as far as it will go. The
needle must be inserted with its long thread groove
toward the left, the eye of the needle being directly
in line with the machine bed. Retighten the
setscrew.
Threading the Machine
Pass the thread from the thread stand from
back to front (fig. 9-29) through the lower hole
(1) in the thread post on top of the machine, then
from right to left through the upper hole (2) in
the post. Pass the thread down through hole (3),
up through hole (4), and down through the hole
(5) in the thread guide on the front of the machine.
Continue the thread over from right to left
between the tension disks (6), and down, from
right to left, around the thread controller (7).
Then the thread should go up into the fork (8)
in the thread controller disk against the pressure
of the wire controller. The thread is then passed
up through the thread guide (9), and from right
to left through the hole in the thread take-up lever
(lo).
Pass the thread down through the thread guide
(11), and between the felt pad and the felt pad
retainer finger (12). (If the machine you are
threading does not have the felt pad and retainer
239.285
Figure 9-29.—Threading the class 111 sewing machine.
finger installed, bypass this component.) Finish
the threading by passing the thread down through
the thread guide (13), through the thread guide
(14) at the bottom of the needle bar, and from
left to right through the eye of the needle (15).
Always thread a needle toward the bobbin.
Removing the Bobbin
To remove the bobbin, draw out the right-
hand slide plate in the bed of the machine. Insert
the fingernail of the forefinger under the latch;
raise the latch and lift the bobbin out. (See figure
9-30).
9-24
