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Figure 4-3.—Side view of Model 225 sewing machine showing oiling points | Up
Aircrew Survival Equipmentman 1 & C - Aviation theories and other practices | Next
TIMING THE 111 W 155 MACHINE |
Figure 4-4.—Timing arrows.
the thread take-up lever with your fingers. You
must check to ensure the arrows on the timing
collar and the timing plate are aligned as shown
in figure 4-4 (B) and (C). If the arrows don’t
match, remove the connection belt from the lower
pulley (figure 4-4 [A] and [D]). Now turn the
lower pulley by hand until the arrow on the
timing collar (figure 4-4 [B]) is in direct line with
the arrow on the timing plate (figure 4-4 [C]).
Replace the connection belt. This completes this
timing point.
2. Setting the feed dog height
Proper feed dog height is necessary to
obtain proper feeding action. To set the feed dogs,
proceed as follows:
a. Turn the balance wheel toward the
operator until the feed dog reaches its highest
point (figure 4-5), and observe the relationship of
the feed dog and the throat plate. If the valley
between the teeth is level with the top of the throat
Figure 4-5.—Feed dogs.
4-5
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