the hook when the machine is In
permanent
use. As the fluff contains a
high percentage of dressing which has an abrasive effect on the sewing
mechanism, in time excessive
wear
would develcp. The whole machine,
including
the
bottom,
should
be
cleaned
with
a
sotit
rag.
r"
Oi
62
(?3
a
a
Photo
17
I
Great emphasis has been placed on making the oil rdservoirs in the
PFAFF
433
as leak-proof as possible.
But
everybody who is familiar with the problem
knows that the capillary attraction of the oil cannot be completely over
come with machines which contain large quantises of oil—and sewing
machines are no exception. Capillary ottroction denotes the property of
thin-bodied oil to spread in every direction and seap even through the
tightest packings, covering the
outer
surface of the machine with a thin
oil
film.
The
functional
arrangement
of
vent
holet
on
the
PFAFF
433
has
greatly
contributed
to
eliminating
excess
pressure
l^nd
attendant
expansion
of the
oil.
But
even
so, for the
reasons
given
abdve,
the
possibility
exists
that a minor leakage may occur when the maihine has been idle for
several
days
or the
temperature
rises
above
normal. In this case it is
important
that
you
do
not
throttle
the
flow
of
oil
Idrastically
as
this
might-
result in insufficient lubrication once the temperature has dropped to nor
mal.
This
temporary
nuisance
can best be remedied and
soiling
of the work
prevented
by
wiping
off,
with
a
clean
rag,
the
|oil
film
that
covers
the
outside of the machine and, particularly, the needle and presser
bars
and
the
underside
of
the
head.
There are many people who prefer, for sewing machines, a clear, colorless
oil in
order
to
avoid
yellowish spots on the work. In this connection we
should
like
to point out that yellowish oil is as pure and free of color
particles as any other brand and that its
yellowish
color is
nothing
but the
result
of optical refraction
which
makes olso the cut edges of glass appear
yellow,
green
or
blue.
|
The
flow of oil to all lubricating points
should
^be
regulated only by a
mechanic.
20
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