Singer 1200-1 - Page 19

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To Clean the Stitch Forming Mechanism
After considerable use, the stitch forming mechan-
ism in the bed of the machine may become clogged
with lint and as this may interfere with the perfect
operation of the machine, it should be removed.
It is rarely necessary to remove the bobbin case
to clean out accumulated lint, but when required,
the bobbin case may be removed and replaced as
instructed below:
To Remove the Bobbin Case
(SEE FIG. 35)
The bobbin case may be easily removed from the
machine without taking off the throat plate, al-
though for the purpose of illustration the throat
plate and feed dog are shown broken away in Fig. 35.
Remove the bobbin from the bobbin case. Turn
the balance wheel over toward you until the end of
the hook ring (K) is toward the front of the machine,
as shown in Fig. 35. Insert the blade of the small
tension screwdriver No. ] 20378, which is furnished
with the machine, into the slot (C) between the ring
and the edge of the spring, as shown in Fig. 3.5. With
a downward pressure, turn the screwdriver one half
turn to the right so that the screwdriver will drop
into the slot and unlock the spring. With the right
hand hold the balance wheel to prevent its turning,
and with the left place the screwdriver against the
edge of the slot in the ring and push it around in a
direction opposite to the hook rotation until the
circular cut-out (B) is opposite the spring (D). The
ring and bobbin case may then be lifted out.
To Replace the Bobbin Case
(SEE FIG. 35)
When replacing the parts, first place the bobbin
ease into position with the finger (A) in the opening
FIG. 3ii. Ronnie CASE IN POSITION
(THROAT PLATE BKOKE.V AWAY TO Snow
CORRECT LOCATION- OF FINGER A)
in the position plate under the feed dog as shown in
Fig. 3Ji. Turn the bobbin case back and forth
slightly to make sure that it is properly seated, them
place the hook ring (K) in position with the cut-out
(B) opposite the spring (D). Press the ring into
place and turn it in the direction of hook rotation
until the spring locks it in position. Then replace
the bobbin.