MAINTENANCE
INSTRUCTIONS
INTRODUCTION
All U.S. BLIND STITCH machines are designed for long life and trouble-free performance. When
installed
and
lubricated
in
accordance
with
the
INSTALLATION
AND
OPERATING
INSTRUC
TIONS, only the minimum maintenance normally associated with industrial sewing machines will
be.required. These maintenance requirements will generally be confined to the four locations des
cribed below, at which wear may be expected
after
extended
use. When such wear does occur, the
worn part may be readily replaced by following the appropriate instructions.
For
ease
of
installa
tion, and to insure satisfactory service, it is essential
that
only genuine U.S. BLIND STITCH parts
and needles are used. They are the only parts designed specifically for the machine, with the built-
in long life and excellent wearing characteristics typical
of
the U. S. BLIND STITCH machine.
A.
REPLACING
THE
LOOPER
1. Should it become necessary to replace the looper (item
"B"
in Figure 6),
loosen the looper clamp screw (item
"A"
in Figure 6) and remove the old
looper. Because
of
the
precise fit
of
the
looper
in the
looper
rod
it may be
necessary to exert amoderate
amount
of
force to pull the looper
out.
Insert
the new looperinto the end
of
the rod as far as it will go before bottoming on
the
looper
shoulder.
2. Any time a looper is moved or changed, recheck the looper timing and reset
if necessary. Proper looper timing is absolutely essential for correct stitch
formation. As described in detail below, aproperly timed
looper
will pass
over the needle in the correct position to pick up
the
loop, and also clear
the
chain-off pin, feeder, looper slot, and needle. The first check
point
for timing
the looper is at the position where the looper picks the thread loop
off
the
needle during the needle return stroke. Referring to Figure 7, (Point "C"),
the long prong
of
the looper should pass over and
just
clear the scarf
of
the
needle, approximately
3/32"
(2.4mm)
behind
the
end
of
the needle eye. At
the
same time, the
short
prong
of
the
looper should pass over
the
needle with
about
1/64"
(.406mm)
clearance, and
must
be so
set
that
it also clears the
chain-off
pin
(item
"D"
in Figure 7).
From the library of: Diamond Needle Corp
