Figs.
81
&
82
Selling the amount
of
needle
bar
rise
and-error
methods, but the high
degree
of
accuracy required for perfect stitch
formation makes it absolutely necessary
to
use the
gauge
and
clamp
made
avai
l
able
for
this purpose by
the
factory.
The
needle rise
gauge
may
be
ordered
by
No
. Z 70.67-1,
and
a matching
clamp
by No. Z 70.68-1 .
By
the
same
token, it is
advisable
to
use
gauge
needle
Z
70.101-4
in
setting the sewing hook
to
the needle. The
advantages
inherent
in
this
nee
dle
are
that
it eliminates the size
to
lerances
of
ordinary
sewing
machine
needles
and
will
not
normally
be
bent.
Pfafl260
Preparatory
to
timing the
sew
ing hook, insert the Pfaff
gauge
needle,
or
a
regular
No. 90 needle, into
the
needle holder, unscrew the
needle
plate, turn
stitch width dial A
to
"0",
and
flick
the needle position lever
to
the central
notch.
loosen
the hook
set
screws just enough
to
permit
the
sewing hook
to
be
turned
on
its shaft.
Needle
Bar
Rise
Turn the
ba
l
ance
wheel until the
need
le has reached the lowest point
of
its
stroke.
Slip both the clamp
and
the
5
!6.N,
or
2.0
mm,
gauge
onto
the
needle
bar,
positioning the latter
between
the clamp
and
the
bottom
of
the casting.
Push
the
clamp up
against
the
gauge
and
tighten the
clamp
screw (Fig.
81
).
This done, pu
ll
out
the
gauge
and
cautiously turn the
balance
wheel
in
sewing
direction
until
the
clamp
bears
against
the costing.
When
in
this position, the
needle
bar
has
risen
5
/6.'',
or
2.0 mm, from the lowest point
of
its stroke.
Now
49
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