Securely lighlen either the hinge siud nut or
sat
sc'ew
k (on
PKA
motors)
so
thot
it will
not
get
loose while sewing. r
If you foil to tighten this screw securely, the motor will be held only by
the
V-belt
and exert c
one-sided
pressure on the tdp shaft bearings
which,
in turn, will
lead
to
overhaating
and
seizing
of
the machine.
21.
Regulafing
the
Flow of
Oil
The flow of oil to the sewing hook, the
top
shaft
bearings
and
the heacl
parts
con be regulated
separately
and
is
set
for normal requirements when
the machine
leaves
the
factory.
If it should
become
oil flow to specific
operating
requirements,
a me
in to
do
the
job.
When
used
for
permanent
oper
bales
of
fabric, a
more
liberal supply of oil is reqi.
Sudden
changes,
particularly
abrupt
rises, in
temp
o
temporary
adjustment
of
the
oil
flow.
Arm
end head parts are
supplied
with
oil
by
mei^j
Through a hole in this tube a jet of oil squirts up
reverberates
and
sprays
the
bevel
gears,
connect
necessary
to
adapt
the
rhanic
has
to
be
called
ation
in
seaming
whole
red
than
for
short
runs,
erature
may
necessitate
Photo
19
ns of line 1 (Photo 19).
against
the
top
cover,
ng
rods
and
eccentrics.
197
maintaining a
constant
film
of
oil
between
all
parts
in moving
contocf.
Of the two valves in line 1, one regulates the flow of oil to the
head
parts
and
the
top
shaft
front
and
center bearings wh"
oil supply for the
top
shaft
rear
bearing.
e
the
other
controls
the
22
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