Photo
23
Tube 5
which
connects the oil pump with hook shdft front bearing G
sup>
plies
oil
only
to
this
bearing.
Having
passed
regulating screw q, the oil drips
retainer,
is flung
away
by centrifugal
force,
drains
hole
and
enters the annular groove in the hook.
i
ito
the
groove
of
the
oil
down
through
an
oblique
The oil flow must be
adapted
to specific operating requirements. The
correct
amount
of
oil
as
follows:
required
under
ordinary
ope
rating
conditions
is
found
Place
a
piece
of stiff paper over the
needle
plate
jopening
and, after about
ten
seconds,
check
whether
two
thin
lines
of
Sfiray
oil,
about of on
inch
apart,
are perceptible on the paper. These lines are
made
by oil
par
ticles which
are
flung
away
from the roce and Ihe front
edge
of the hook.
After
sewing
for
about
fifteen minutes,
repeat
the
above
check
and
slacken
regulating screw q in case the oil marks should foil to appear.
The amount of oil which is to be fed to the sewing hook greatly depervds
on
the
material
to
be
sewn.
Since
the
particles
of
the
dressing
mix
with
the
i)il
and
thicken
it,
heavily
dressed materials require a lavish oil flow to the
dewing
hook.
This
mixture
tends not only to choke the oil conduits but also to
wear
the hook unduly
and
to
"blacken"
the
sewing
thread.
|
All this con be avoided by permitting the oil to flow more profusely. This
will
keep
the dressing particles from absorbing enough oil to settle down
and,
instead,
will
wash
them
away
out
of
the
hook.
26
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